Automotive & Equipment

what is a crank shaft and how does it work

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what is a crank shaft and how does it work

What is Crankshaft and How Doеs It Work A crankshaft is a rotating shaft that is driven by a crank mechanism. what is a crank shaft and how does it work It is a mechanical unit that helps convert the linear motion of the piston into rotational motion. The crankshaft is an important part of the engine’s power transmission system. Located inside the engine crankshaft block, what is a crank shaft and how does it work it works by using a connecting rod to convert the reciprocating motion of the piston into rotational motion. This rotating motion created by the crankshaft drives the flywheel, which in turn turns the wheels of the vehicle. what is a crank shaft and how does it work Now that wе’vе еxaminеd thе componеnts lеt’s еxplorе how a crankshaft works within thе contеxt of an intеrnal combustion еnginе: 1. Powеr Strokе Initiation: – Thе procеss bеgins during thе powеr strokе of thе еnginе cyclе. what is a crank shaft and how does it work In this strokе, thе comprеssеd fuеl-air mixturе is ignitеd by thе spark plug (in gasolinе еnginеs) or by thе hеat gеnеratеd during comprеssion (in diеsеl еnginеs). – Thе rapid еxpansion of thе hot gasеs from combustion еxеrts a forcе on thе piston, driving it to movе downward within thе cylindеr. This downward motion gеnеratеs thе mеchanical powеr within thе еnginе. 2. Piston Motion: – As thе piston movеs downward, it is connеctеd to thе connеcting rod via thе piston pin. This connеction еnablеs thе piston to transfеr its linеar motion to thе connеcting rod. – Thе connеcting rod, in turn, is attachеd to thе crankshaft at thе crank pin. what is a crank shaft and how does it work As thе piston movеs, it pivots thе connеcting rod, causing thе crankshaft to rotatе about its axis. 3. Crankshaft Rotation: – As thе crankshaft rotatеs, thе rotational motion is transmittеd to thе transmission and ultimatеly to thе whееls of thе vеhiclе. This rotation of thе crankshaft gеnеratеs thе mеchanical powеr that propеls thе vеhiclе forward. 4. Rеvеrsing thе Procеss: – Oncе thе powеr strokе is complеtеd, thе еnginе progrеssеs through thе othеr phasеs of thе four-strokе cyclе, including еxhaust, intakе, and comprеssion strokеs. what is a crank shaft and how does it work During thеsе strokеs, thе crankshaft rеvеrsеs its rotation, guiding thе piston back up thе cylindеr. – This еntirе procеss rеpеats hundrеds or thousands of timеs pеr minutе, dеpеnding on thе еnginе’s RPM (rеvolutions pеr minutе), to providе continuous powеr and propulsion. Significancе of Crankshafts The internal combustion (IC) engine has been an important prime mover in our society since its invention in the last quarter of the 19th century [for more information, see, for example, Haywood (1988)]. Its purpose is to generate mechanical energy from the chemical energy contained in the fuel and released by the combustion of the fuel inside the engine. what is a crank shaft and how does it work It is this unique feature, that the fuel is burned inside the work-producing part of the engine, that gives IC engines their name and distinguishes them from other types such as external combustion engines. what is a crank shaft and how does it work Although gas turbines meet the definition of an IC engine, the term is traditionally associated with spark-ignition (sometimes called otto, gasoline, or gasoline engines) and diesel engines (or compression-ignition engines). Internal combustion engines are used in marine propulsion and power generation packages ranging from more than 100 MW capacity to less than 100 W portable devices. This means that the size and characteristics of today’s engines vary widely between large diesels. 1,000 mm and reciprocating at speeds as low as 100 rpm for small gasoline two-stroke engines with cylinder bores greater than about 20 mm. Within these two extremes are medium speed diesel engines, heavy vehicle diesels, truck and passenger car engines, aircraft engines, motorcycle engines and small industrial engines. what is a crank shaft and how does it work Among all these categories, passenger car petrol and diesel engines dominate as they are the largest production engines in the world; Therefore, their impact on social and economic life is very important. Most reciprocating internal combustion engines have what is known as a four-stroke cycle (Figure 1), which is divided into four processes: intake, compression, expansion/power, and exhaust. what is a crank shaft and how does it work Each engine cylinder has four strokes of its piston to complete the power-generating sequence corresponding to two crankshaft revolutions. Typеs of Crankshafts Crank Types  There can  three types of cranks which are listed and described below- 1. Overhung crank 2. Disc crank 3. Center crank or side crank 1. Overhung crank- An overhung crank has two ends, one end of which can  fixed to the shaft by means of a key, and the other end hangs like a cantilever, hence it can called an overhung crank. It can made of forged steel. The crank pin can mounted to the crank arm with a rivet or press fit or shrink fit. Overhung cranks can generally used in medium and large horizontal machines. 2. Disc Crank- Its shape can disc-like. A crank pin can placed at some distance from the center of the disc. It works like an overhung crank. The disk can made thicker where the crank pin can mounted and the rest of the disk can made thinner to balance the weight of the crank pin and connecting rod, the larger end of which fits over the crank pin. Disc cranks can mostly used for high speed and medium speed engines. 3. Center or side crank- A center crank has crank arms on either side of the crank pin. That’s why called a center crank. The crank arms can connected to the crankshaft supported by bearings. Center cranks can used in multi-cylinder engines where two or more cylinders produce power on a single crankshaft. Crankshaft Manufacturing Procеss The crank can usually made of … Read more

How Doеs a Connеcting Rod Work

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How Doеs a Connеcting Rod Work

Connеcting Rod Working Principle Whеn you observed of an intеrnal combustion еnginе, you might picturе pistons shifting up and down inside cylindеrs, however, thеrе’s a crucial componеnt that makеs this motion possiblе thе connеcting rod. How Doеs a Connеcting Rod work Connеcting rods arе unsung hеroеs in thе world of еnginеs, rеsponsiblе for translating thе linеar movement of pistons into thе rotational motion of a crankshaft. In this comprеhеnsivе guidе, wе will dеlvе into thе innеr workings of connеcting rods, еxploring thеir anatomy, feature, and significancе in thе world of intеrnal combustion еnginеs. Intеrnal Combustion Enginе Bеforе wе divе into thе spеcifics of connеcting rods, it is еssеntial to undеrstand thе fundamеntal concеpt of an intеrnal combustion еnginе. Whеthеr it is thе еnginе for your vehicle, motorcyclе, lawnmowеr, or еvеn a massivе ship, thе simple principlе rеmains thе samе. Intеrnal combustion еnginеs opеratе through convеrting thе chеmical еnеrgy storеd in a fuеl-air mixturе into mеchanical еnеrgy. This convеrsion occurs thru a sеriеs of four-strokе cyclеs: intakе, comprеssion, powеr, and еxhaust. How Doеs a Connеcting Rod Work Thе connеcting rod performs a pivotal rolе all through thе powеr strokе, that’s whеrе thе еnginе gеnеratеs its mеchanical powеr. Anatomy of Connеcting Rod A connеcting rod is a slеndеr, rod-shapеd componеnt that connеcts thе piston to thе crankshaft in an intеrnal combustion еnginе. How Doеs a Connеcting Rod Work To undеrstand the way it works, lеt’s brеak down its anatomy: 1. Large end: Thе huge еnd of thе connеcting rod is thе largеr of thе two еnds and connectеs to thе crankshaft. It oftеn has a cap that can bе boltеd or rapidеnеd sеcurеly to thе crankshaft magazine. 2. Small end: Thе smallеr еnd of thе connеcting rod connеcts to thе piston. It generally fеaturеs a piston pin or wrist pin, allowing it to pivot as thе piston movеs. 3. Shank: Thе shank is thе long, slеndеr a part of thе connеcting rod that еxtеnds bеtwееn thе huge еnd and thе small еnd. It’s miles rеsponsiblе for transmitting thе motion from thе piston to thе crankshaft. 4. Bolts or fastеnеrs: Connеcting rods arе sеcurеd to both thе crankshaft and thе piston the usage of bolts or othеr rapidеning mеchanisms. Thеsе bolts must bе torquеd to prеcisе spеcifications to еnsurе thе intеgrity of thе assеmbly. 5. Bеarings: Bеarings arе typically usеd at each еnds of thе connеcting rod to rеducе friction and wеar. Thеsе bеarings providе a clean surfacе for thе rod to pivot and slidе on. Now that wе’vе еxaminеd thе componеnts lеt’s еxplorе how a connеcting rod works within thе contеxt of an intеrnal combustion еnginе. How Doеs a Connеcting Rod Work? A connеcting rod’s primary feature is to facilitatе thе convеrsion of linеar motion to rotational movement. How Doеs a Connеcting Rod Work Hеrе’s the way it accomplishеs this internal an intеrnal combustion еnginе: 1. Powеr Strokе Initiation: – Thе procеss bеgins in the path of thе powеr strokе of thе еnginе cyclе. On this strokе, thе comprеssеd fuеl-air mixturе is ignitеd by means of thе spark plug (in gasolinе еnginеs) or through way of thе hеat gеnеratеd all through comprеssion (in diеsеl еnginеs). – Thе speedy еxpansion of thе warm gasеs from combustion еxеrts a forcе on thе piston, driving it to movе downward inside thе cylindеr. How Doеs a Connеcting Rod Work This downward motion gеnеratеs thе mеchanical powеr inside thе еnginе. 2. Piston movement: – As thе piston movеs downward, it is connеctеd to thе small еnd of thе connеcting rod via thе piston pin. This connеction еnablеs thе piston to transfеr its linеar motion to thе connеcting rod. – Thе small еnd of thе connеcting rod pivots and movеs in an arc, mirroring thе movement of thе piston. This pivoting movement еnsurеs that thе piston’s linеar movеmеnt is еffеctivеly translatеd into thе rotational motion rеquirеd for thе еnginе to expose thе crankshaft. Crankshaft Intеraction: – Thе huge еnd of thе connеcting rod is connectеd to thе crankshaft, that’s a pivotal componеnt of thе еnginе. Thе crankshaft fеaturеs a sеriеs of offsеt throws or journals. – As thе connеcting rod pivots and movеs, it forcеs thе crankshaft to rotatе approximately its axis. How Doеs a Connеcting Rod Work This rotational movеmеnt is what ultimatеly drivеs diverse accеssoriеs and providеs propulsion for thе vеhiclе. Rеvеrsing thе Procеss: – Oncе thе powеr strokе is complеtеd, thе еnginе progrеssеs via thе othеr phasеs of thе 4-strokе cyclе, along with еxhaust, intakе, and comprеssion strokеs. During thеsе strokеs, thе connеcting rod rеvеrsеs its movement, guiding thе piston returned up thе cylindеr. – This еntirе procеss rеpеats hundrеds or lots of timеs pеr minutе, dеpеnding on thе еnginе’s RPM (rеvolutions pеr minutе), to providе non-stop powеr and propulsion. Significancе of Connеcting Rods Connеcting rods may additionally appеar to bе simplе componеnts, but thеy arе absolutеly vital to an еnginе’s capability, pеrformancе, and longеvity. How Doеs a Connеcting Rod Work Hеrе’s why connеcting rods arе huge: 1. Powеr Transmission: Connеcting rods play a cеntral rolе in transmitting thе powеr gеnеratеd all through combustion from thе pistons to thе crankshaft. This powеr is what ultimatеly drivеs thе vеhiclе or powеrs othеr еquipmеnt, making connеcting rods critical componеnts of еnginе functionality. 2. Durability and Strеngth: Connеcting rods arе subjеctеd to excessive mеchanical strеssеs, еnduring fast changеs in motion, tеmpеraturе, and prеssurе. Thеrеforе, thеy must bе constructеd from durablе matеrials, oftеn alloy stееl or titanium, to resist thеsе harsh conditions. 3. Balancing Act: Propеrly balancеd connеcting rods arе еssеntial for thе clean opеration of thе еnginе. How Doеs a Connеcting Rod Work Imbalancеs can lеadvert to vibrations, rеducеd еnginе еfficiеncy, and prеmaturе wеar. Thеrеforе, prеcisе еnginееring and production arе critical. Connеcting Rods Four. Wеight Rеduction: In modеrn еnginе dеsignal, thеrе’s a consistent push to rеducе wеight to еnhancе fuеl еfficiеncy and pеrformancе. How Doеs a Connеcting Rod work Connеcting rods arе not еxеmpt from this trеnd. Manufacturеrs strivе to dеsignal lightwеight yеt robust connеcting rods that contributе to thе ovеrall rеduction in thе еnginе’s wеight whilе … Read more

Function of piston rings in ic engine

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Function of piston rings in ic engine

What is a piston ring Between the piston and the cylinder, the piston ring is an essential part for the engine to work efficiently. Piston rings have 4 main functions. Function of piston rings in ic engine A piston ring is a segmented ring in a reciprocating engine such as an internal combustion engine or steam engine that fits into a groove on the outside diameter of the piston. Function of piston rings in ic engine The function is to maintain complete air tightness in the cylinder between the piston and the cylinder wall. During detonation, the space between the piston and the cylinder works hard to seal off the leaking combustion gas. Function of piston rings in ic engine If the combustion gas leaks, the full power is not realized and fuel consumption increases, which is economically and environmentally harmful. The operation continues to create the minimum layer of lubricating oil necessary to prevent combustion inside the engine cylinder, the piston ring is exposed to high temperature combustion gas and travels along with the piston several thousand times per minute. Return, or more. To ensure that the piston rings and cylinder do not burn, and to prevent excess lubricant from entering the combustion chamber, the cylinder wall lubricant layer is controlled to the minimum required level. The action of releasing heat from the piston to the cylinder When the gas explodes, the temperature inside the piston reaches about 300 degrees centigrade. If that heat stays inside the piston, the engine can be damaged, so the heat must be released from the interior. Function of piston rings in ic engine Function of piston rings in ic engine The piston ring helps to do this. The function of preventing the piston from making strong contact with the cylinder wall, if the piston is at an angle, it contacts different places while moving, and this may cause damage to the engine. The piston ring supports the piston so that the piston can travel up and down easily. Functions Gas seal operation This means that the combustion chamber must be as gas-tight as possible so that the pressure generated by the rapidly burning combustion gases moves the piston in the cylinder, thereby rotating the crankshaft, Function of piston rings in ic engine thereby providing power. Very important not only for combustion/expansion stroke but also for gas tightness, intake, compression and exhaust stroke. This common function can simply be called a “gas seal”. Heat transfer function Piston rings conduct heat from the hot piston to the cold cylinder wall/engine block. Heat energy flows from the piston groove to the piston ring and then to the cylinder wall, where it is ultimately transferred to the engine coolant. This heat transfer function is critical to maintain acceptable temperature and stability in the piston and piston rings so that sealing performance is not compromised. Oil control function The piston rings require some oil for lubrication, although Function of piston rings in ic engine it is desirable to keep this amount to a minimum. The rings act as a scraping mechanism, keeping excess oil out of the combustion chamber. In this way, oil consumption remains at an acceptable level and harmful emissions are reduced. Piston rings serve three purposes Piston rings seal off the combustion chamber. They are precisely positioned so that proper pressure is applied to the cylinder wall or liner, Function of piston rings in ic engine which ensures a constant film of oil on the working surfaces of the cylinder. It provides adequate lubrication and prevents wear. Perkins piston rings come in three ring shapes. They are the upper compression ring, then the intermediate compression ring and finally the oil control ring. These parts are relatively small in size, but play a large role in your engine’s master cylinder block. Their function is to seal the gases produced in the internal combustion process, helping to transfer heat to the cylinder wall, which then both lubricates and removes oil from it. Getting the right amount of oil is important. Function of piston rings in ic engine Too much oil will burn and your engine will produce blue smoke while too little oil will eventually cause the engine to shut down. The primary function of the upper compression ring is to seal off most of the combustion gases to ensure maximum power output from your engine. Any failure or weakness in the piston rings in this area means that your engine is performing less than expected. The lower ring can responsible for most of the oil control, helping to ensure that the correct amount of oil can used to lubricate the working surfaces of the cylinder, while the intermediate ring serves both functions, including combustion sealing. plays a final role. And the oil spills down. As a result of these three rings working in harmony, Function of piston rings in ic engine adequate lubrication within the cylinder bore ensures that unnecessary wear does not occur at any time. Pistons and piston rings A piston is a cylindrical engine component that slides back and forth in the cylinder bore due to the forces generated during the combustion process. Function of piston rings in ic engine The piston acts as the moving end of the combustion chamber. The fixed end of the combustion chamber is the cylinder head. Pistons can usually made of cast aluminum alloy for better and lightweight thermal conductivity. Function of piston rings in ic engine Thermal conductivity is the ability of a material to transmit and transfer heat. Aluminum expands when heated, and proper clearance must be provided to maintain free movement of the piston in the cylinder bore. Insufficient clearance can cause the piston to become stuck in the cylinder. Excessive clearance will increase compression loss and piston noise. Piston features include piston head, piston pin bore, piston pin, skirt, ring grooves, ring lands, and piston rings. The piston head can the top surface of the piston (closest to the cylinder head) that … Read more

what is the function of piston in ic engine

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what is the function of piston in ic engine

What is Piston The piston transfers combustion pressure to the connecting rod and crankshaft. It should hold the piston ring and piston pin while working on the cylinder. Pistons are usually made or forged from an aluminum alloy. Cast pistons are relatively smooth and are used in slow-speed, low-performance engines. function of piston in ic engine Forged pistons are commonly used in today’s fuel-injected, turbocharged and diesel engines. These engines expose the pistons to very high compressive loads, which can break cast aluminum pistons. The piston must withstand incredible punishment under extreme temperatures. Examples of conditions a piston must encounter at normal highway speeds include: Function of piston in ic engine  Pistons play an important role in automobile engines, including spark ignition gasoline engines and compression ignition diesel engines. The process of these two internal combustion engines is different but they use pistons. The functions of a piston in an automobile engine are given below: The main function of the piston is to transfer the power output of a small burst of gas in the cylinder to the crankshaft. function of piston in ic engine It provides rotational motion to the flywheel. It moves forward so that the gases are compressed and explode as it moves backward. The piston has a pin called the piston pin which allows the gas in the chamber to escape. A connecting rod attached to the bottom of the piston allows the mechanical work to be changed. Pistons help move the air-fuel mixture during the combustion cycle. Pistons use oil control rings to help control the flow of oil to the cylinder walls. As the piston moves from the top to the bottom of the cylinder (or vice versa), function of piston in ic engine  it accelerates from a stop to about 60 mph at the midpoint, and then slows to a stop again. It does this about 80 times per second. The piston must with stand a pressure of 1,000 psi in its head Temperatures above 600°F. The structural components of a piston are the head, skirt, ring grooves, however, not all pistons look like the normal piston shown here. Some have different shaped heads. The piston head is the top of the piston and is exposed to combustion heat and pressure. function of piston in ic engine This field must be dense enough to withstand these forces. The working volume should match the combustion chamber volume for complete combustion. Piston material Cast iron can earliest material used to make pistons. However modern machines benefit from lighter materials for mechanical balance. Good pistons should be able to withstand the engine’s combustion temperatures. Alloys such as Y alloy and aluminum can particularly used to achieve such properties. function of piston in ic engine Pistons can  made from aluminum alloy with casting process. Some pistons used in racing vehicles require higher strength and fatigue life, which can why they can forged. function of piston in ic engine Billet pistons can also used in racing engines because they can independent of the size and architecture of available forges, allowing for last-minute design changes. However, it is usually invisible to the naked eye. Types of pistons Below are three types of pistons: Dish piston: A dish piston can shaped like a plate with slightly curved outer edges. function of piston in ic engine It is easy and simple and gives less hassle to engineers. It can often used in boosted applications that do not require a high-lift camshaft or high compression ratios. Flat-top piston: The flat-top type of piston has a flat top. It has less surface area, which allows it to generate more power. This is perfect for creating efficient combustion. Flat-top pistons produce more detonation in the chamber, but compression may be too high for small combustion chambers. Dome Piston: The concept of a dish piston is the exact opposite of a dish type. function of piston in ic engine Middle bubble to increase surface area remaining on top of piston. Well, more surface area means less compression, while more compression means more power generation. The combustion chamber has a maximum limit to what it can handle, so reducing the compression ratio is the best way to avoid breaking the engine. Function of piston Piston skirt is the edge of the piston below the end ring. Without a skirt, the piston can bend and jam in the cylinder. A slipper skirt can formed when a portion of the piston skirt can removed below the piston ends. The slipper skirt provides clearance between the piston and the crankshaft counterweight. This allows the piston to slide into the cylinder without hitting the crankshaft. A straight skirt with a flat bottom, this style is no longer common in automotive engines Piston ring grooves can machined slots in the piston for the piston rings. function of piston in ic engine The top two grooves hold compression rings. The lower piston groove holds the oil ring. The piston oil hole in the lower ring groove allows oil to pass through the piston and into the cylinder wall. The area between and above the piston ring lands ring groove. They separate and support the piston rings as they slide over the cylinder. Piston boss is a reinforced part around the piston pin bore. The piston pin must be strong enough to withstand heavy loads. Function The piston pin can drilled through the pin boss for the piston pin. function of piston in ic engine It is slightly larger than a piston pin. The piston pin, also known as the wrist pin, allows the piston to oscillate on the connecting rod. The pin fits through holes in the small end of the piston and connecting rod. Piston clearance is the clearance between the edges of the piston and the cylinder wall. The clearance allows a lubricant film to form between the piston and the cylinder. It also allows the piston to expand as it heats up. The cam-ground piston (Figure 3-15) looks … Read more

4 stroke internal combustion engine work

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How does a 4 stroke internal combustion engine work

Principle of operation of machines For a machine to work successfully, it must follow an orderly cycle of operation. The sequence is very rigid and cannot be changed. The working principle of SI and CI engines is described in the following sections. Although both engines have a lot in common there are some basic differences. Nicholas A. How does a 4 stroke internal combustion engine work is credited with inventing the spark-ignition engine. Otto (1876) while the compression-ignition engine was invented by Rudolf Diesel (1892). Hence, they are often referred to as otto engines and diesel engines. Mechanical components 4-stroke internal combustion engine work The main components of a cross-section engine of a single-cylinder spark-ignition engine with overhead valves and their functions are briefly described below. How does a 4 stroke internal combustion engine work Cylinder Block: The cylinder block is the main subsystem For different components. The cylinders of a multicylinder engine can assembled into a single unit called a cylinder block. The cylinder head and cylinder block are provided with water jacket when water cooled or cooling fins when air cooled. A cylinder head gasket can included between the cylinder block and the cylinder head. The cylinder head can rigidly attached to the cylinder block by a number of bolts or studs. How does a 4 stroke internal combustion engine work The lower part of the cylinder block can called the crankcase. Attached to the bottom of the crankcase can a cover called the crankcase which becomes the sump for the lubricating oil. The inner surface of the cylinder block can  machined and precisely shaped into a cylindrical shape and can called the bore or face. How does a 4 stroke internal combustion engine work As the name suggests it is a cylindrical vessel or where the piston does the reciprocating motion. How does a 4 stroke internal combustion engine work During engine operation the various blocks formed in the cylinder can  filled with working fluid and subjected to various thermodynamic processes. Piston: It is a cylindrical component that fits into the cylinder and forms the moving boundary of the combustion system. It fits perfectly into the cylinder and provides a gas-tight space with piston rings and lubricants. Combustion Chamber: The space at the top of the cylinder covered by the cylinder head and the top of the piston during the combustion process can called the combustion chamber. Combustion of fuel and release of heat energy creates pressure in this part of the cylinder. Inlet Manifold: The pipe that connects the intake system to the inlet valves of the engine and through which the air or air-fuel mixture can drawn into the cylinder can called the inlet manifold. How does a 4 stroke internal combustion engine work Exhaust Manifold: The pipe that connects the exhaust system to the exhaust valve of the engine and through which the combustion products can  released into the atmosphere. Inlet and Exhaust Valves: Valves can usually mushroom-shaped poppet types. These are provided in the cylinder head or on the side of the cylinder to regulate the charge entering the cylinder (inlet valve) and exhaust the combustion products from the cylinder (exhaust valve). Spark Plug: This is the component that initiates the combustion process in sparkignition (SI) engines and is usually located in the cylinder head. Components   Connecting Rod: It connects the piston and the crankshaft and transmits the gas forces from the piston to the crankshaft. How does a 4 stroke internal combustion engine work The two ends of the connecting wire can called the small end and the large end (Fig. 1.3). The smaller end can connected to the piston by the gudgeon pin and the larger end can connected to the crankshaft by the crankpin. Crankshaft: It converts the reciprocating motion of the piston into effective rotary motion of the output shaft. How does a 4 stroke internal combustion engine work The crankshaft of a single cylinder engine consists of a pair of crank arms and balance weights. Balance weights are provided for static and dynamic balance of rotating system. The crankshaft can attached to a crankcase. Piston Rings: Piston rings fitted in slots around the piston provide a strong seal between the piston and the cylinder wall, preventing leakage of combustion gases (see Figure 1.3). Gudgeon Pin: It connects the small end of the connecting rod and the piston. How does a 4 stroke internal combustion engine work Camshaft: The camshaft (not shown in the figure) and its associated parts control the opening and closing of the two valves. The parts involved are push rods, rocker arms, valve springs and tappets. This shaft provides the drive to the ignition system. The camshaft can driven by the crankshaft through the timing gear. Cams: These can formed as an integral part of the camshaft and can designed to open the valves at the right time and hold them open for the required duration (not shown in the figure). Flywheel: The net torque supplied to the crankshaft during a full cycle of engine operation causes fluctuations, How does a 4 stroke internal combustion engine work which cause angular changes, in the form of a wheel connected to the output shaft, this wheel can  called a flywheel. (not shown in picture). Cylinder Bore (D): The nominal internal diameter of the working cylinder can called the cylinder bore and can denoted by the letter D and can usually expressed in millimeters (mm). Piston Area (A): The area of a circle with a diameter equal to the cylinder bore can  called the piston area and can denoted by the letter A and can usually expressed in square centimeters (cm2). Stroke (L): The nominal distance that a working piston moves between two consecutive reversals of its direction of motion can called the stroke and can denoted by the letter L and can usually expressed in millimeters (mm). Stroke to Bore Ratio: L/T ratio is an important parameter in sizing an engine. If d < L, … Read more

working principle of 2 stroke ic engine

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working principle of 2 stroke ic engine

working principle of 2 stroke ic engine A two-stroke engine is one that completes its operating cycle in one revolution of the crankshaft or two strokes of the piston. working principle of 2 stroke ic engine In this engine the operations of the intake and exhaust processes of the four-stroke engine are taken care of by the incoming fresh charge, which is compressed in the crankcase or by a separate blower, near the bottom dead center of the engine piston. will happen. , the engine piston only needs to compress the new charge and expand the combustion products. Since a two-stroke engine has twice the number of revolutions per minute as a four-stroke engine operating at the same speed and with the same number of cylinders, it theoretically produces twice the power while operating at the same average effective pressure. working principle of 2 stroke ic engine Like a four-stroke engine, the power output of this engine depends on the number of air per minute available for combustion.   Many two-stroke engines have greatly simplified engine construction, using the piston as a slide valve, with intake and exhaust ports cut into the side of the cylinder. If the engine runs on the Otto cycle, the charge consists of a proper mixture of fuel and air, whereas the charge for a diesel or dual combustion cycle consists of pure air. working principle of 2 stroke ic engine There are several difficulties in applying the two-stroke principle to small high-speed CI engines, although these are by no means insurmountable. For SI engines, the two-stroke cycle principle is used for a large number of engines, working principle of 2 stroke ic engine from small single-cylinder model engines producing a fraction of a kilowatt to the largest aircraft engines capable of 2500 kW or more units. Types of two-stroke engines There are basically two types of two-stroke engines depending on the scavenging method used: The details of the above two types of two-stroke engines are briefly discussed in the following sections. Crankcase scavenged engine One of the simplest types of two-stroke engines. working principle of 2 stroke ic engine In this engine, the charge (fuel-air mixture in SI engines and air in CI engines) is compressed in the crankcase below the piston during the expansion stroke. This engine has three ports. IC machine (i) Crankcase swept engine (ii) Separately designed machine (i) Intake port in crankcase (ii) Port of transfer (iii) Port of exit Crankcase-scavenged two-stroke engine The compressed charge forces the combustion products into the engine cylinder through the charge transfer port. This process is called scavenging, and engines of this type are called crankcase-scavenged engines. As the piston moves down, it first opens the exhaust ports, and the cylinder pressure drops to atmospheric levels as the combustion products exit these ports. working principle of 2 stroke ic engine In addition, the downward movement of the piston exposes the transfer ports, which allow the slightly compressed mixture in the crankcase or air (depending on the type of engine) to enter the engine cylinder. The top and ports of the piston are usually designed so that fresh air is directed toward the top of the cylinder before flowing toward the exhaust ports. It is intended to clear the top of the cylinder of combustion products and reduce the flow of fresh fuel-air mixture directly through the exhaust ports. The projection on the piston is called a deflector. As the piston returns from the bottom center, the transfer ports and exhaust ports are closed and charge compression begins. working principle of 2 stroke ic engine The movement of the piston during compression reduces the pressure in the crankcase so that fresh mixture or air can be drawn into the crankcase through the inlet reed valve. Ignition and expansion occur normally, and the cycle repeats itself. The engine is undercharged by one cylinder displacement volume due to flow restrictions at the inlet reed valve and transfer port. Optional machine Another type of engine that uses an external device such as a blower to clean the combustion products is called an externally or separately scavenged engine. Details of this type of machine . In these engines the air-fuel mixture is supplied to the inlet manifold at a slightly higher pressure. working principle of 2 stroke ic engine As the piston moves downward along the expansion side, it opens the exhaust ports approximately 60◦ before the bottom center. After about 10◦, when the pressure in the cylinder is low enough, the inlet ports are opened and the cleaning process takes place. The inlet port is designed so that most of the air flows through the top of the cylinder, moves down the exhaust side, and forms an annulus before reaching. working principle of 2 stroke ic engine This ensures cleanliness of the upper cylinder block. Piston deflectors are not used because they are heavy and overheat at high outputs. Compared to normal crankcase scavenged engines with deflector pistons, the scavenging process is more efficient in this type of engines. Opposite of piston or end-to-end scavenged engine: Another type of two-stroke engine is called the opposed piston type or sometimes called the end-to-end scavenged engine. Details of this type of machine. In this way the discharge ports are opened first. The inlet port is designed so that the air or mixture enters tangentially, giving a reciprocating motion. working principle of 2 stroke ic engine Vortex helps prevent mixing of new charge and combustion products during the cleaning process. At the beginning of the compression stroke, the exhaust ports close first. As the flow passes through the inlet ports the cylinder pressure begins to increase and the inlet ports close when the pressure is close to the inlet manifold pressure. Note that in this opposed piston engine the two pistons are slightly out of phase. working principle of 2 stroke ic engine In loop-scavenged engines the port timing is symmetrical so that the exhaust port closes after the inlet … Read more

What is open and cross belt mechanism

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What is open and cross belt mechanism

Open the belt drive and cross belt drive Mechanical power transmission systems are used to transmit mechanical power What is open and cross belt mechanism (in the form of rotational torque) from a drive shaft (such as a prime mover) to a driven shaft (such as an engine unit). A belt drive is a mechanical drive (gear drive, chain drive, and rope drive among others) that is used to transmit motion, torque, and power from one shaft to another. Initially, a pulley of required diameter is applied rigidly to the shaft. An endless belt wraps around the nadis, maintaining proper tension to avoid slipping. What is open and cross belt mechanism The belt, partially wrapped around it, passes over the pulley and acts as a flexible intermediate link between the drive and the driven shaft. The frictional force between the belt and the pulley helps transmit motion and power from one shaft to the other. The initial tension applied to the belt, as well as the friction characteristic between the mating surfaces, determine the power transfer efficiency. What is open and cross belt mechanism For a constant speed on the driven shaft, the pulley diameter determines the speed ratio and rotational speed of the driving shaft. A flexible belt helps in reducing vibration, thereby preventing displacement of the driving element. Although it cannot provide constant speed ratio due to inherent drift, it is very useful for short and long distance power transmission. What is open and cross belt mechanism However, slip prime movers can be prevented from overloading. The direction of rotation can be changed using open or crossed belt drives, while the ratio of speed and rotational speed is maintained by the diameter of the pulleys for the drive and driven shafts. This affects the power transfer efficiency due to changes in the wrap angle between the belt and the pulley. This classification mostly applies to flat belts because V-belts are almost always used in an open configuration. An arrangement in which an endless (joint) belt passes from one pulley to another without crossing it is called an open belt drive. Here the driven shaft rotates in the same direction as the drive shaft. Also, the wrap angle is always below 180°; Due to this, the power transfer efficiency also decreases. On the other hand, in cross belt drive, the belt runs from above one pulley to below the other pulley, thus crossing itself. What is open and cross belt mechanism Right here the driven shaft rotates within the opposite direction. The wrap angle also increases, resulting in higher energy transfer efficiency. However, constant rubbing of the belt shortens the life of the belt and causes the belt to wear out quickly. Also, it requires a relatively long belt. Table of Differences Between Open Belt Drive and Cross Belt Drive Open belt drive In an open belt drive, the belt moves from one pulley over the other without crossing. Here the entire belt is in the same plane in each rotation. Here the drive and driven shafts rotate in the same direction. The wrap angle or contact angle between belt and pulley is always less than 180°. Due to small wrap angle, power transfer efficiency is low. In open belt system the length of belt is relatively short. Here the belt does not touch itself. So no rubbing. Thus the belt exhibits long life. Belt vibrates (whips) if center distance between two pulleys is too large. Cross belt drive In cross belt drive, the belt moves from one pulley above to another below, What is open and cross belt mechanism thus crossing itself. Here the belt changes in two different planes in each revolution. Here the drive and driven shafts rotate in opposite directions. Wrap angle is always greater than 180°. Power transmission efficiency is also high due to large wrap angle. For the equal pulley length and middle distance, a pass belt drive calls for an extended belt. As it passes between the two pulleys, the belt rubs against each other and gradually wears out. Crossbelt system is free from such vibrations.   Belt configuration of cross belt drive The shape of the flexible element in the belt drive may vary. What is open and cross belt mechanism A flat belt is a composite belt with a rectangular cross-section where the width is greater than the thickness (height). A V-belt is an endless belt with a trapezoidal cross-section of equal width and height. A ribbed belt is similar to a flat belt, but has teeth along the inner circumference that mesh with corresponding slots on the pulley. Open and crossed belt configurations are associated with flat belts only. In an open belt system, What is open and cross belt mechanism the belt passes over one pulley without crossing over the other. In a closed belt system, the belt runs from above one pulley to below the other, thus crossing itself. Belt Buckle In an open belt configuration, the inside of the belt touches the pulley; However, the belt does not bend or flip as it travels from one pulley to another. So the belt stays in the same plane throughout the cycle. In a cross belt drive, the belt runs from one pulley up to the other pulley down. Since only an inner portion of the belt can wrap around or touch the pulley, the belt must can bent 180° between the driver and the driven shaft. There are two such turns for each revolution of the belt. Direction of rotation An important advantage of belt drives over gear drives is the ability to rotate the drive and driven shaft in the same or opposite direction without the use of other accessories. In single phase, the gear drive only rotates in the opposite direction unless the intermediate or idle gear can engaged. What is open and cross belt mechanism An open belt drive can rotate the driven shaft in the same direction as the drive shaft; Whereas, … Read more

Double housing planer machine

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Double housing planer machine

Planer machine Working Principle The principle of planar machining is the concept of relative tool-work motion. Reciprocating and slow, intermittent cross feed movement of the tool or work is provided by fast straight path cutting motion to the work or tool. All the work done in planning machines can be done in drafting machines. Double housing planer machine Long stroke length, large size and high rigidity enable planing machines to handle larger jobs and heavier work on their longer surfaces. It produces flat and plane surfaces with a single-point cutting tool. Double housing planer machine A planer machine is bigger and more spacious as compared to a shaper machine. A planer can machine heavy workpieces, which a shaper surface cannot. Definition of Planar Machine: A planer machine is a machine in which unwanted material is cut from the workpiece to create a flat surface on the workpiece. Double housing planer machine Unlike the shaper machine, this machine can perform an operation by setting up more than one tool. Double housing planer machine This planer is high speed heavy duty machine. It is used for large table beds, table wedges, dovetails and sliding machines. It is used to machine the workpiece in horizontal and vertical directions   Area: Bed Schedule Column Cross Rail Tool head Bed 1.Bed Strong Box Heavy Duty Casting. It is reinforced by cross ribs along upper “V” guide ways. Double housing planer machine The schedule is set based on these guidelines. It has a driving mechanism. Schedule The table consists of a box type rectangular casting with T-slots on it. It responds to guiding patterns in bed. The work pieces are clamped to the table using T-bolts and clamps. Point dogs are provided on the side to adjust the stroke length table. House or pillar There are two columns on either side of the bed. Both columns are connected by cross rails at the top. Vertical guide ways are provided on column and cross rail slides It is. It has two side tool head slides Feed mechanism and power transmission connections are housed within these columns. Cross rail Cross rail is a horizontal hollow structure. It slides vertically up and down the columns by raising the screw. This tool organizes the feed. The cross rail is clamped at any height. Tool head The planer has a total of four tool heads. Two in cross rail and other two in vertical column. They can work independently. When machining an inclined surface, the tool can be tilted as required The angle of inclination of the spindle base. Planner Specifications: Distance between two columns Dimensions of Table (L, B, D) Maximum stroke length of table Height of cross rail from top of table in its upper position. Net weight of machine Driver type Floor area Motor power Driving and feeding mechanism: The feeding mechanism of the tool head is either transverse or vertical by the power arm. Double housing planer machine The drive mechanism is located under the table and the motor drive is on one side of the planer. Double housing planer machine The size of the planer can specified by the maximum length of the stroke and the largest rectangular shape that can machined. Now let us study the operation of planar machine, Working Principle of Planer Machine: The work table can moved and the tool head of the machine can in a fixed position. The workpiece can fixed in the work table and Double housing planer machine The single point cutting tool can attached to the tool head and now we start the machine, which means the power can  supplied to the machine and the work table moves forward. Hence it cuts the material and can called cutting stroke. Double housing planer machine The work table moves downwards and the material can not cut, so it can called a return stroke. This process continues until the power supply can replaced. Planer Machine Mechanism: Mechanics and its mechanisms include the reciprocating movement of the work table and the conversion and transmission of the rotation of the motor into the transverse movement of the tools. The reciprocating movement of the table providing cutting motion to the work can achieved by a rack-pinion mechanism. Double housing planer machine The rack can fixed to the table and the pinion can fixed to the output shaft of the speed gearbox. The blocks hold the cutting tools moving horizontally on the rail through a screw-nut system, and the rail can  moved up and down by separating it from the screw-nut pair. Alternatively a belt can used as a drive to rotate the table. Double housing planer machine A large contact curve in the large pulley can used to move the table. High power and low speed can required during the cutting stroke and this can done by connecting the cross belt to a large diameter pulley. Types of Planer Machine: There are five different types of planer machines: Double housing planer machine Bit planer machine  Open page engine Edge planer machine and Divided table planer machine Double Housing Planer Machine: Most workshops use dual home planer machines. Double housing planers have a long, heavy base with precision machine guides around which a table rotates. Double housing planer machine The length of the bed is twice the length of the table. A housing can fitted with two vertical housings: one on each side and these can connected at the top by a cross member. Double housing planer machine It consists of a horizontal cross rail which has two tool head slides on the vertical faces of the machine housing. For feeding operation, tool head can rotated by hand or power in transverse or vertical direction. The double housing planer is a high speed, heavy and rugged machine. It has a high level of surface finish. The work can placed on a table, which reacts when the tool can placed in the frame of the machine. Double housing planer machine It can make deep … Read more

What is injection moulding of plastics

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What is injection moulding of plastics

Injection molding Process There are various processes for processing thermoplastic or thermosetting plastics. What is injection moulding of plastics Each process gives the plastic the desired shape. Common manufacturing processes for making plastics are given below. The process of plastic processing using a twin screw extruder is similar to that of a single screw extruder. But they rotate two screws in a hot barrel. The output of a twin screw extruder is typically three times that of a single screw extruder of the same diameter and speed. In a counter-rotating twin screw extruder, the fabric is efficaciously squeezed between counter-rotating rolls. What is injection moulding of plastics  In a co-rotating system, material is transferred from one screw to another in a figure eight. This arrangement is best suited for heat-sensitive materials, as the material is moved through the extruder more quickly and there is less chance of entanglement. If the screws are interlocked, the movement around the screw will be slower, but the propulsive action will be greater. Injection molding for thermosetting materials: Thermoset molding is the reverse process of thermoplastics. What is injection moulding of plastics Thermoset molding is an irreversible process in which a chemical rather than a physical change occurs. The thermoset material is injected into the hot mold and then cooled to maintain the final shape of the part. Special barrels and screws are used in this process. What is injection molding of plastics The barrel is kept warm (typically 80 to 120°C) because the material must not be cured in this part of the machine, as thermoplastics can be very hot. Also, high viscosity. What is injection moulding of plastics In these materials, the screw must rotate at high torque and require high injection pressure. Work policy Discharge can created by forcing a material through the opening of a die. What is injection moulding of plastics In this, the powdered material, usually thermoplastic, is fed into a hopper. What is injection moulding of plastics The heating chamber can moved by a screw conveyor. raw material A viscous liquid forms in the heating chamber. Then, the liquid can poured through the heated die. The material coming out of the die rests on a moving conveyor and can cooled by water, Air spray to get the size of the die opening. Heavy plastic material can cut into required shapes and flexible plastic can produced. curled up In this, the granular material is fed from the hopper, in metered quantities, into a thermodynamic chamber, where it liquefies. Then, the soft plastic can forced into the die by a plunger. Injection molding dies ca used to solidify a molten plastic material. The injection pressure causes the liquid to drop. What is injection moulding of plastics After the cooling period, the wings can opened and the entire solid part can ejected. In this the granular material can metered through a hopper into a thermoforming chamber where the material becomes a liquid. The injection mold consists of two parts, which are the origin part of the mold. What is injection moulding of plastics The mating surfaces of the mold parts can precisely machined so that there is no plastic leakage into the split area. A number of additional modifications have can made to the basic mold components to guide mold mounting, molding cooling, and extrusion in the machine. The resins then fall into the hot tube and can pushed against each other and with the hot tube. Keep the screw (feeder) on until you get enough molten plastic Needle tip tip. The screw can tilted fully forward to force the plastic into the mold. Based on each shaking action, one or more parts can formed. Dye was used. The ram can kept under pressure for a certain period until the part becomes solid. The mold can then opened and the knockout pin ejects the cast piece. Ejector Pin: These are provided for easy removal of the cast iron part from the mold. Typically, the ejector pin can driven by hitting a stop with a shoulder screw in the axle opening. Gate: It is a small hole that connects the raceway to the cavity. It also acts as a valve by allowing molten plastic to fill the mold. What is injection moulding of plastics The most commonly used gates are the following types. Sprue gate – when the sprue bush feeds directly into the mold cavity 2. Back gate – reduces the stickiness of the plastic and the mold fills more easily 3. Side gate – feeds plain plastic next to another mold. Athletics: The runner is the stream of molten plastic that goes from the sprue to the gate. What is injection moulding of plastics What is injection molding of plastics The cross-sectional area of the raceway should be large to minimize resistance to plastic flow. Sprue: A sprue is a channel through which molten plastic enters the mold. Melts from the tip of the system to the runner. It has a thin cross-section for easy extrusion from molds. Ventilation: The cavity can filled with air before the plastic can inserted. As the melt enters the mold, it can compressed if air cannot escape. The sudden compression of the air creates heat and is enough to burn the plastic and create local hot spots. To avoid this, holes can  precisely machined in the mating surfaces of the molds to allow air to escape. What is injection moulding of plastics Typically, the vent size is 0.025 mm deep and several millimeters wide. Structural Foam Injection Molding: These plastics have a dense cellular core. The foam effect can achieved by dispersing an inert gas directly into the molten resin before molding, introducing the gas can usually done by mixing the resin with a chemical blowing agent, which releases the gas when heated. . Nitrogen can usually used for this purpose. What is injection moulding of plastics When a compressed gas or resin mixture can  rapidly injected into the mold cavity. The gas … Read more

working principle of Shaper machine

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working principle of Shaper machine

Principle of operation working principle of Shaper machine It is a reciprocating machine tool used for flat machining working principle of Shaper machine. single point cutting tool is used and placed on the ram. Ram performs horizontally. The work item is placed on the table. Metal is removed while moving forward. Feed is supplied at the end of the cutting stroke. As the ram reacts against the workpiece, metal is cut and removed by the tool. Format Types working principle of Shaper machine The forms are classified as follows: By Type of Driving Mechanism a) Cracked and Slotted Link Drive b) White Worth Mechanism c) Hydraulic Drive According to the travel of ram a) Horizontal pattern b) Vertical pattern According to table type a) Fixed or simple shaper b) Universal shaper By type of cutting a) Push cut shaper b) Draw cut shaper. Standard Format: Area: Foundation: It is made of CI and bears the entire load. Column: It is a hollow box and made of CI. It is placed on the base. It has a quick return mechanism for RAM and navigation modes. The top of the line ram is fixed by dovetail guide systems Cross Rail: It is mounted on the column. Horizontal guide ways are provided and are called saddles The table slides over the saddle. The cross rail raising screw is provided with vertical movement desk: It is a rectangular and plain CI block. working principle of Shaper machine This is a slide on guiding methods. It is supported by an adjustable table support and has T slots for clamping operation The table is moved horizontally by rotating the cross feed screw. The table is rotated vertically by turning the elevating screw to beat: It holds the tool head at the front end. Rama guides the path of the dove’s tail at the top of the pillar. It is associated with quick return mechanism. The stroke length of the ram is adjusted by rotating the hand wheel on the ram. Tool head: It consists of equipment. It has a vertical slide and a revolving base. The tool can be rotated in the vertical direction by turning the feed screw downwards at the required angle. Can give vertical and angular feed to tool head. Apron is fitted and can be tilted as per requirement The shield has a clapper box and the tool block is inside it. Tools module contains tools. During the cutting stroke, the tool block fits firmly Inside the clapper box. During the return stroke, the tool block moves out of the clapper box. It is Prevents tool rubbing at work. Format Specifications: Maximum stroke length Maximum horizontal movement of table Maximum vertical speed of table Motor power Type of driving mechanism Ratio of cutting stroke time to go back stroke time Type of pattern – plain or universal Net weight of shaper Floor space Quick Withdrawal Mechanism: Forward cutting stroke cuts into the metal workpiece. working principle of Shaper machine During return stroke, no metal is cut, it can called passive stroke. Idle stroke time is essential to reduce overall machining time to reduce For this the return stroke can made faster than the cutting stroke and can done by A mechanism called the quick withdrawal mechanism. A quick return of RAM can achieved through the following quick return mechanism. Mechanism Crank and slotted linkage mechanism Whitworth mechanism Hydraulic mechanism Crank and slotted link mechanism:   An electric motor can used to drive the driving pinion at constant speed. The bull rotates the gear at a constant speed. Pull gear can a large gear and can mounted inside the column. working principle of Shaper machine A slide can also attached Diameter on face of bull gear. Pull gear sliding block can slide on the pull gear slide. Its position can adjusted radially by rotating the stroke adjustment screw. This can done by rotating the bevel gear with a handle from the outside. A crank pin can mounted on the pull gear sliding block. The rocker arm sliding block can mounted independently on the crank pin. The end can pivoted under a slotted link or rocker arm. The upper end of the rocker arm can shaped like a fork. It can independently connected to the RAM module by a pin. working principle of Shaper machine Perforated links have a slot along the length. The rocker arm sliding block fits into this slot. When the pull gear rotates, the crank pin also rotates. The rocker arm sliding block rotates in the crank pin circle. At this point this sliding block slides up and down in the slot of the slotted link (rocker arm). It gives swinging motion to the rocker arm. It responds to RAM. When the slotted connector is in the PA position, the RAM is in the back position (at the end of the page). When the link is in BB, the RAM is in the forward position. PA and PB are tangent to the crank pin circle. The forward cutting stroke occurs when the crank pin angle rotates through C1KC2. working principle of Shaper machine The return stroke occurs when the crank pin angle rotates through C2LC1. Angle C1KC2 is greater than angle C2LC1. Bull gear has the same speed. The stroke length is same during forward stroke and return stroke. So the return stroke takes less time. Cutting speed is not uniform throughout the stroke length. This is the minimum working principle of Shaper machine It is the maximum in the middle Paralysis. To correct the stroke condition: The clamping manage on the ram can loosened first. working principle of Shaper machine There is a screw inside the ram The stroking position adjustment knob should can rotated. Now the ram moves forward or backward. After adjusting the RAM status, The clamping handle can tightened Whitworth quick withdrawal mechanism An electric motor rotates the driving gear at constant speed and this gear rotates the pull gear at constant speed. The driving … Read more