The working conditions of the crank linkage mechanism, what is the function of the crank linkage mec

The crank connecting rod mechanism is composed of three parts: the body group, the piston connecting rod group, and the crankshaft flywheel group.

Crank linkage mechanism.

1) Machine body group: cylinder block, cylinder gasket, cylinder head, crankcase, cylinder liner and oil pan.

2) Piston connecting rod group: piston, piston ring, piston pin, connecting rod.

3) Crankshaft flywheel group: crankshaft, flywheel, torsional shock absorber, balance shaft.

Airframe group. The body is the skeleton that constitutes the engine, is the installation foundation of the engine's various mechanisms and systems, and all the main parts and accessories of the engine are installed inside and outside to bear various loads. Therefore, the body must have sufficient strength and rigidity.

Cylinder block. The cylinder block is the assembly base of each mechanism and system of the engine, and is the most important component in the engine. There are water-cooled cylinder blocks and air-cooled cylinder blocks.

The water-cooled cylinder block is generally cast into one piece with the upper crankcase. The upper part of the cylinder block shoots out all the cylinders, and the cavities around the cylinders are connected to each other to form a water jacket. The lower part is the crankcase that supports the crankshaft.

There are three forms of cylinder block: in-line, V-shaped and horizontally opposed, and two types are commonly used in automobiles. The structure of the lower part of the cylinder block has three forms: general, gantry, and tunnel, and the air-cooled cylinder block and crankcase adopt a split structure, and the cylinder block and crankcase are cast separately and then assembled together. There are many heat sinks cast on the outer surface of the cylinder block and cylinder head to ensure full heat dissipation, the material of the cylinder block is generally gray cast iron, in order to improve the wear resistance of the cylinder, sometimes a small amount of alloying elements such as nickel, molybdenum, chromium, phosphorus, etc. are added to the cast iron.

However, in fact, except for the cylinder wall surface mated with the piston, the other parts do not have high requirements for wear resistance. For the sake of material economy, cylinder liners are widely embedded in the cylinder body to form the cylinder working surface. In this way, the cylinder liner can be made of alloy cast iron or alloy steel with good wear resistance to prolong the service life of the cylinder, while the cylinder block can be made of ordinary cast iron or aluminum alloy materials with low wear resistance.

There are two types of cylinder liners: dry and wet.

The outer surface of the dry cylinder liner is not in direct contact with cold water, and its wall thickness is generally 1 3mm. The outer surface of the cylinder liner and the inner surface of the assembled cylinder adopt an interference fit.

The outer surface of the wet cylinder liner is in direct contact with the cooling water, and the cooling effect is good. Its wall thickness is thicker than that of dry cylinder liners, generally 5 9mm.

Cylinder head. The main function of the cylinder head is to close the upper part of the cylinder, which, together with the piston top and the cylinder wall, constitutes the combustion chamber.

Generally, a cooling water jacket is cast in the cylinder head of a water-cooled engine, and the lower end face of the cylinder head is connected with the water jacket corresponding to the upper end of the cylinder block, and the circulation of water is used to cool the high-temperature parts such as the combustion chamber wall; The cylinder head of an air-cooled engine has a number of fins cast on it, which reduces the temperature of the combustion chamber by increasing the heat dissipation area.

The cylinder head of the engine should have intake and exhaust valve seats, duct holes and intake and exhaust channels, etc. The cylinder head of a gasoline engine should also have a spark plug hole, while the diesel engine should have a hole for installing an injector.

Cylinder head gasket. The cylinder gasket is installed between the cylinder head and the cylinder block, and its function is to ensure the sealing between the cylinder head and the cylinder block, and prevent the leakage of the combustion chamber and the water jacket.

Oil pan. The main role of the oil pan is to store the oil and seal the crankcase. The oil pan is stressed very little and is generally thin.

The function of the crank connecting rod mechanism The function of the crank connecting rod mechanism is to provide a combustion place, and convert the expansion pressure of the gas acting on the top of the piston after fuel combustion into the torque of the crankshaft rotation, and continuously output power. (1) Change the pressure of the gas into the torque of the crankshaft (2) Change the reciprocating motion of the piston into the rotary motion of the crankshaft Composition of the crank connecting rod mechanism The crank connecting rod mechanism is composed of three parts: the body group, the piston connecting rod group, and the crankshaft flywheel group. (1) Body group:

Cylinder block, cylinder state, cylinder head, crankcase and oil pan (2) Piston connecting rod group: piston, piston ring, piston pin, connecting rod (3) Crankshaft flywheel group: crankshaft flywheel.

Provide a place for combustion.

The function of the crank connecting rod mechanism is to provide a combustion place, and convert the expansion pressure of the gas acting on the top of the piston after fuel combustion into the torque of the crankshaft rotation, and continuously output power. The crank linkage mechanism is the main moving part of the engine to realize the working cycle and complete the energy conversion.

The crank linkage is the main kinematic mechanism of the engine. Its function is to convert the reciprocating motion of the piston into the rotary motion of the crankshaft, and at the same time convert the force acting on the piston into the torque output of the crankshaft, which rotates with the wheel of the driving car.

Precautions for the use of crank connecting rod mechanism

It should be noted that the crankshaft intermediate frequency induction hardening will adopt a microcomputer monitoring closed-loop intermediate frequency induction heating device, which has the characteristics of high efficiency, stable quality and controllable operation.

In order to improve the quality of crankshafts produced in large quantities, a microcomputer-controlled nitrogen-based atmosphere gas soft nitriding line will be used in the future. The nitrogen-based atmosphere gas soft nitriding production line is composed of a pre-cleaning machine (washing and drying), a preheating furnace, a soft nitriding furnace, a cooling oil tank, a post-cleaning machine (cleaning and drying), a control system and a gas production and distribution system.

The function of the crank linkage mechanism is to provide a combustion place, and the expansion pressure of the gas generated after fuel combustion acting on the top of the piston is converted into the torque of the crankshaft rotation, and the power is continuously output.

1. Change the pressure of the gas into the torque of the crankshaft.

2. Change the reciprocating motion of the piston into the rotary motion of the crankshaft.

3. The force of combustion acting on the top of the piston is converted into the torque of the crankshaft to output mechanical energy to the working machinery.

The function of the crank connecting rod mechanism: to provide a combustion place, to convert the expansion pressure of the gas generated after fuel combustion on the top of the piston into the torque of the crankshaft rotation, and continuously output power.

The pressure of the gas is converted into the torque of the crankshaft, the reciprocating motion of the piston is changed to the rotary motion of the crankshaft, and the force of combustion on the top of the piston is converted into the torque of the crankshaft to output mechanical energy to the working machine.

The crank connecting mechanism is the core mechanism of the engine to realize the conversion of thermal energy and mechanical energy, and its function is to convert the heat energy released by fuel combustion into mechanical energy that can drive the car through pistons, connecting rods, crankshafts, etc. The crank connecting rod mechanism is mainly composed of cylinder block, cylinder head, piston, connecting rod, crankshaft and flywheel and other parts.

The work emitted by fuel combustion is converted into rotary motion by the reciprocating motion of the piston, and the power is output through the crankshaft and gearbox.

When starting, the piston is driven to move up and down, and after starting, it is pushed by the piston to carry out rotary motion and output power to the outside world.

Thermal energy is converted into mechanical energy, and the mechanical energy is transferred and exported.

Cars are a must-have tool for everyone to get around. Of course, automotive knowledge is essential. In order to make it easier for everyone to understand this knowledge, today, Bian Xiao will introduce to you the question of the role of the crank connecting rod mechanism.

Interested friends can learn about it, which may be helpful to you.

The crank mechanism is the key kinematic mechanism of the engine. Its function is to convert the reciprocating motion of the piston into the rotational motion of the crankshaft, and at the same time convert the force acting on the piston into the torque output of the crankshaft, thereby driving the wheels of the car. The function of the crank connecting rod mechanism is to convert the heat energy generated by fuel combustion into mechanical collision energy, and convert the reciprocating motion of the piston into the rotary motion of the crankshaft through the connecting rod to output power.

The crank connecting rod mechanism is composed of three parts: cylinder block group (including cylinder block, crankcase, oil pan, cylinder liner, cylinder head, cylinder head and other static parts), piston connecting rod group (including piston, piston ring, piston pin, connecting rod and other moving parts) and crankshaft flywheel group (including crankshaft, flywheel, torsional vibration damper, balance shaft). There are three types of crank linkages:

Dual cranks, twin rockers, and crank rockers. Those that can do circular motion are called cranks, and those that can only swing in the range of less than 360 are called rockers. A double crank is a crank that drives the crank, and a double rocker is a rocker with a rocker swing.

Crank rocker mechanism: when the crank is the driving part, the crank circularly moves with the rocker swing; When the rocker is the driving component, the rocker swings to drive the crank to circulate the motion.

The crank train is one of the most important components in the engine, and its working conditions must be able to withstand high temperatures, high pressures, high speeds and chemical corrosion. When the engine is working, the crank mechanism needs to be exposed to gases such as flammable gas mixtures and combustion exhaust gases at high temperature and high pressure. At the same time, the crankshaft speed is too fast, and the piston reciprocating linear speed is large, which outputs mechanical energy to the machine.

When installing the cranktrain, you need to pay attention to the following points. First of all, before installation, the parts must be cleaned, the fit clearance must be checked and the technical appraisal must be carried out, and the parts that do not meet the technical requirements must be repaired or replaced. Secondly, the vortex chamber pit at the top of the piston and the lubricating oil hole at the small end of the connecting rod must be on the same side and facing upwards.

When replacing the new cylinder liner, the cylinder liner should be put into the mounting hole before installing the water retaining ring, and the height of the protruding body should be checked to meet the requirements before it can be formally installed. For the S195 diesel engine, when the pipeline wear is less, it is allowed to rotate 90 degrees for use; However, the lines of the S195 diesel engine cannot be rotated. When installing the piston rings, be careful not to damage the piston or break the piston rings.

Place the chrome ring into the ring slot of the first channel, the first.

If there is a notch on the outer edge, please make the notch collapse downward, and the chamfer of the outer edge of the oil ring must be upward. Four-wheel set of piston rings.

The second and third wheel rings are tapered rings, and the side of the ring with " " or "d" is facing up when it is installed. When installing the combined oil ring, first install the two ends of the ring without overlapping or bending, and then install it in the order of the upper flat ring, the corrugated ring, and the lower flat ring. Before assembling the piston rod set, apply fresh oil to the surface of the piston and cylinder liner.

When inserting, make sure that the openings of the piston rings are staggered 120 degrees from each other, avoiding the vortex depression and the piston pin hole, so as to avoid the position where the piston is subjected to side pressure. When placing the piston ring into the line, use a special tool (iron clamping ring). In addition, it is also necessary to pay attention to the use of left and right main bearings can not be replaced; Do not install the upper and lower connecting rod pads incorrectly.

After the connecting rod tile is pressed into the tile base, it should have a certain degree of tightness, slightly higher than the tile base plane. The crimping edge of the cylinder liner must be towards the cylinder head side, and the boring hole must be aligned with the boring hole of the machine body. When tightening the cylinder head nut, please tighten it evenly in the diagonal cross part according to the specified torque, too tight will make the washer lose its elasticity, the bolt and threaded hole are easy to slip, and too loose will easily cause air leakage and gasket burning.

After replacing the new cylinder group Xiaoshen washer, 20 hours after starting, the cylinder head nut must be tightened once according to the regulations.

Hello, answer: the working conditions of the crank connecting rod are rotten: when the engine is working, the crank connecting rod mechanism is in direct contact with the high temperature and high pressure gas, the rotation speed of the crankshaft is very high, the linear speed of the reciprocating motion of the piston is quite large, and at the same time it is connected with the combustible mixed natural gas and the combustion exhaust gas, and the crank connecting rod mechanism is also subject to chemical corrosion, and it is difficult to lubricate.

When the engine is working, the crank connecting rod mechanism is in direct contact with the high temperature and high pressure gas, the rotation speed of the crankshaft is very high, the linear velocity of the reciprocating motion of the piston is quite large, and at the same time it is in contact with the combustible mixed gas and the combustion exhaust gas, and the crank connecting rod mechanism is also subject to the chemical volcanic corrosion, and the lubrication is difficult. It can be seen that the working conditions of the crank connecting rod mechanism are quite harsh, and it has to withstand high temperature, high pressure, high speed, and chemical corrosion. Crank Train The main kinematic mechanism of the engine.

Its function is to transform the reciprocating motion of the live spring plug into the rotary motion of the crankshaft, and at the same time convert the force acting on the piston into the torque output of the crankshaft to drive the wheel of the car to rotate.

Working conditions of crank connecting rod: when the engine is working, the crank connecting rod mechanism is in direct contact with the high temperature and high pressure gas omegali, the rotation speed of the crankshaft is very high, and the linear velocity of the reciprocating motion of the piston is quite large, and it is in contact with the combustible mixture gas and combustion exhaust gas at the same time.

The composition of the crank linkage mechanism is as follows:

1) Machine body group: cylinder block, cylinder gasket, cylinder head, crankcase, cylinder liner and oil pan.

2. Piston connecting rod group: live dismantling and guessing and plugging, travel piston ring, piston pin, connecting rod;

3) Crankshaft flywheel group: crankshaft, flywheel, torsional shock absorber, balance shaft.