What is the role and composition of the automobile valve mechanism?

1. The function of the valve mechanism: open and close the intake and exhaust valves of each cylinder regularly, so that the fresh combustible mixture (gasoline engine) or air (diesel engine) can enter the cylinder in time, and the exhaust gas can be discharged from the cylinder in time. During the compression and power strokes, the valve is closed to ensure that the combustion chamber is sealed.

2. The valve mechanism is composed of camshaft, tappet, push rod, rocker arm, rocker arm shaft, valve spring and valve guide and other related components. Camshafts are arranged on the engine with bottom, side and overhead. Modern engines are often overhead-mounted, which is located on the cylinder head.

The camshaft drives the valve directly through the tappet, eliminating a large set of reciprocating parts such as tappets and push rods, which is very suitable for high-speed engines, but also brings the difficulty of the transmission shaft, because the camshaft is on the cylinder head, the cylinder head is more troublesome to disassemble and assemble, and the arrangement of the injector is also more difficult.

3. All kinds of valve mechanism can be divided into two parts: valve group and valve transmission group. The valve train includes the valve and the parts associated with it, and its composition is basically independent of the form of the valve train. The valve train is all the parts from the timing gear to the valve action, and its composition varies depending on the form of the valve mechanism, and its function is to drive the valve to open and close at a regular time.

4. Valve overhead type is the most widely used type of valve mechanism. Both the intake and exhaust valves are hung upside down on the cylinder head. The valve train includes valves, valve guides, valve seats, spring seats, valve springs, cleats and other parts.

The four-stroke engine valve train is generally composed of a valve group and a valve transmission group, and according to the arrangement of the camshaft on the engine, the common valve train can be divided into two categories: overhead camshaft and lower camshaft (including mid-camshaft). Generally, the toothed belt or chain drive mode is adopted, and the advantages of the toothed belt are that there is no lubrication, the working noise is small, and the service life is slightly worse than that of the chain. Compared with toothed belts, the disadvantages of chain drive are that it requires lubrication and the transmission noise is larger, and the advantage is that it is reliable to use and can have the same life as the engine.

The function of the gas distribution mechanism is to open and close the inlet and exhaust valves in a timely manner according to the needs of the work, and introduce the combustible gas into the cylinder and discharge the exhaust gas in time. At the same time, it drives distributors, gasoline pumps and other parts to work. The main parts of the valve mechanism include: intake valves, exhaust valves, camshaft drive parts, etc.

1. Function:

It is to open and close the intake and exhaust valves of each cylinder regularly in accordance with the requirements of the working cycle or firing sequence carried out in each cylinder of the engine, so that the fresh combustible mixture or air can enter the cylinder in time, and the exhaust gas can be discharged from the cylinder in time.

2. Composition: valve group: valve and its associated parts; Valve train: Everything from the timing gear to the actuation of the propulsive valve. There is a valve gap between the tail end of the valve stem and the rocker end (the tappet end of the side-mounted valve train) to compensate for the expansion of the valve after heating.

When the engine is started, the valves will inflate in response to the rising temperature. If there is no gap between the valve and its transmission parts in the cold state or the gap is too small, in the hot state, the thermal expansion of the valve and its transmission parts will inevitably cause the valve to close loosely, resulting in the leakage of the engine in the compression and power stroke, so that the power decreases, and it is not even easy to start in serious cases.

In order to eliminate this phenomenon, a certain gap between the valve and its transmission mechanism is usually reserved in the cold assembly of the engine to compensate for the expansion of the valve after heating. This gap is called the valve clearance.

However, if the valve clearance is too large, there will be collisions between the transmission parts and between the valves and the valve seats in the cold state, and the wear will be accelerated, and the duration of valve opening will be reduced, and the cylinder inflation will deteriorate. Therefore, hydraulic tappets are used in high-end cars, and the length of the tappet can be automatically changed to compensate for the thermal expansion of the valve at any time, so there is no need to reserve valve clearance.

The function of the valve distribution mechanism is to open and close the intake and exhaust valves regularly according to the needs of the working process of each cylinder of the engine, so that the fresh combustible mixture (gasoline engine) or air (diesel engine) can enter the cylinder in time, and the exhaust gas can be discharged from the cylinder in time.

It is mainly composed of two parts: the valve drive group and the valve group.

The valve train comprises valves, valve guides, valve seats, spring seats, valve springs, lock plates and other parts; The valve drive group generally consists of a rocker arm, rocker shaft, push rod, tappet, camshaft and timing gear.

It consists of three parts, the valve train, the valve train and the valve actuation.

The engine consists of two major mechanisms and five major systems.

1. Crank connecting rod mechanism: connecting rod, crankshaft, bearing, flywheel, piston, piston ring, piston pin, crankshaft oil seal;

2. Air distribution mechanism: cylinder head, valve chamber cover, camshaft, valve, intake manifold, exhaust manifold, air filter, muffler, three-way catalysis, supercharger, intercooler, etc.;

3. Cooling system: generally composed of water tank, water pump, radiator, fan, thermostat, water temperature gauge and water discharge switch; (The automobile engine adopts two cooling methods, namely air cooling and water cooling, and the engine in the mainstream market of China's automobile is mostly water-cooled.) ）

4. Lubrication system: The engine lubrication system is composed of oil pump, filter, oil filter, oil channel, pressure limiting valve, oil gauge, pressure plug and oil dipstick, etc.;

35. Fuel system: The fuel system of gasoline engine is composed of gasoline tank, gasoline gauge, gasoline pipe, gasoline filter, gasoline pump, carburetor, air filter, intake and exhaust manifold, etc.;

6. Starting system: starter, ignition switch, battery;

7. Ignition system: spark plugs, high-voltage wires, high-voltage coils, distributors.

The function of the valve mechanism is to open and close the intake and exhaust valves of each cylinder regularly in accordance with the requirements of the working cycle and firing sequence carried out in each cylinder of the engine, so that the fresh charge can enter the cylinder in time and the exhaust gas can be discharged from the cylinder in time; During the compression and expansion strokes, the sealing of the combustion chamber is ensured. Fresh charge is a combination of gasoline and air for a gasoline engine, and pure air for a diesel engine.

Structure: valve train parts include: valves, valve seat inserts, valve guides, valve springs, valve spring seats and valve lock clamps, etc.; Valve train parts include:

Camshafts, tappets, pushrods, rocker arms, rocker arm shafts, rocker arm shaft seats, and valve clearance adjustment screws, etc. Working principle: According to the working sequence of the engine and the requirements of the working cycle, the intake and exhaust valves of each cylinder are opened and closed regularly, so that the fresh air enters the cylinder and the exhaust gas is discharged from the cylinder.

When the protrusion of the cam comes into contact with the tappet, it starts to jack up the tappet and the valve is opened. When the maximum bulge of the cam comes into contact with the tappet, the valve reaches its maximum opening. Subsequently, the bulge on the contact surface between the cam and the tappet begins to gradually become smaller, the valve begins to rise and close under the action of the valve spring, and the transmission rod such as the rocker arm is pushed in reverse to keep the tappet in contact with the cam.

The valve train is composed of two groups: valve transmission group and valve group, valve transmission group includes crankshaft timing gear, camshaft timing gear, camshaft, tappet, push rod, rocker arm, valve clearance adjustment screw and lock nut, rocker arm shaft, valve group includes valve, valve guide, valve spring, valve spring seat, valve oil seal, valve seat, valve seat, etc.

The engine valve mechanism (internal combustion engine valve mechanism) is to open and close the intake and exhaust valves of each cylinder regularly in accordance with the requirements of the working cycle and ignition sequence carried out in each cylinder of the engine, so that the fresh combustible mixture (gasoline engine) or air (diesel engine) can enter the cylinder in time, and the exhaust gas can be discharged from the cylinder in time. During the compression and power strokes, the valve is closed to ensure that the combustion chamber is sealed. Hope to be adopted by you, thank you.

1.Composition: intake valves, exhaust valves, hydraulic tappet assemblies, camshafts, camshaft timing gears, etc.

2.Function: According to the working cycle sequence in each cylinder of the engine, the intake and exhaust valves of each cylinder are opened and closed regularly to ensure that the fresh combustible mixture (gasoline engine) or air (diesel engine) can enter the cylinder in time, and the exhaust gas generated after combustion is discharged from the cylinder in time.

3.Classification: The valve mechanism is divided into two types: valve valve and valve valve. Automobile engines mostly use valve valve mechanisms.

The valve train is composed of camshafts, tappets, push rods, rocker arms, rocker arm shafts, valve springs and valve guides and other related components. The camshafts are arranged on the engine in a way that is underneath, sideways and overhead. Modern engines often use the overhead type, which is located on the cylinder head of the gas delay.

The camshaft drives the valve directly through the rocker arm, eliminating a large set of reciprocating parts such as tappets and push rods, which is very suitable for high-speed engines, but also brings the difficulty of the transmission shaft, because the camshaft is on the cylinder head, the cylinder head is more troublesome to disassemble and assemble, and the arrangement of the fuel injector is also more difficult. There is also an overhead type in which the camshaft is directly actuated by the spokes of the valve. The advantages of this form are not only simple mechanism, small inertia, and low requirements for camshafts, so it is widely used in new automobiles.

Please help me if mine is helpful to you, thank you!

The valve train is composed of camshaft, rocker arm, rocker arm shaft, tappet, push rod, valve blind lift, valve seat, valve spring chain sail and valve guide.

Hope this helps,!! Grind the old!

Cylinder heads, valve chamber cover camshafts, valve intake manifolds, exhaust manifolds, air filters, mufflers, three-way catalytic superchargers, etc.

The role of the gas distribution mechanism is to open and close the inlet and exhaust valves in a timely manner according to the needs of the work, and introduce the combustible gas into the cylinder socks and discharge the exhaust gas in time. At the same time, it drives distributors, gasoline pumps and other parts to work. The main parts of the valve mechanism include:

Intake valves, exhaust valves, camshaft drives, etc.

The function of the automobile valve train is to open or close the intake and exhaust valves according to the actual working condition of each cylinder of the engine.

The function of the valve mechanism is to open and close the intake and exhaust valves of each cylinder at regular intervals according to the requirements of the working cycle and firing sequence carried out in each cylinder of the engine, so that the fresh charge can enter the limb tomato cylinder in time, and the exhaust gas can be discharged from the cylinder in time; During the compression and expansion strokes, the sealing of the combustion chamber is ensured.