What are the main components of the valve mechanism?

The valve distribution mechanism is the control mechanism of the intake and exhaust pipes, which opens and closes the inlet and exhaust valves on time in accordance with the working sequence of the cylinder and the requirements of the working process, supplies combustible mixture (gasoline engine) or fresh air (diesel engine) to the cylinder and discharges the exhaust gas in time. In addition, when the intake and exhaust valves are closed, the cylinder is sealed.

1. Classification of gas distribution mechanism.

Composition of the valve mechanism.

Generally, the engine of the automobile adopts a valve-type valve mechanism, which is mainly composed of a valve group and a valve transmission group.

The valve group includes valves, valve guides, valve seats and valve springs and other parts, and some intake valves are also equipped with valve rotation mechanisms, and the valve group should ensure the tightness of the valve to the cylinder.

The valve transmission group mainly includes camshaft, timing gear, tappet and its duct, push rod, rocker arm and rocker shaft, etc., and its function is to make the intake and exhaust air according to the time specified in the gas distribution phase to open and close, and ensure that there is enough opening.

Classification of valve trains.

According to the different valve installation positions, the valve train is divided into valve overhead valve mechanism and valve side valve mechanism.

The valve is located on the cylinder head, which is called the valve overhead valve mechanism, which consists of cams, tappets, push rods, rocker arms, valves, and valve springs, among others. Its characteristics, small intake resistance, compact combustion chamber structure, large air agitation, can achieve a high compression ratio, the current domestic automobile engines are using valve overhead valve mechanism.

The valve is located on the side of the cylinder block, which is called the valve side-mounted valve mechanism, which consists of cams, tappets, valves, and valve springs, etc. Alternative parts such as push rods and rocker arms are omitted, and the structure is simplified. Because its intake and exhaust valves are on one side of the cylinder, the compression ratio is limited, the intake and exhaust valve resistance is large, and the power and high speed of the engine are poor, and it is gradually eliminated.

Overhead camshaft valve mechanism.

Generally, the camshaft installation position of the engine has three forms: bottom, middle and top. Overhead camshafts are camshafts that are placed in the cylinder head, above the combustion chamber, and directly drive the rocker arm and valves, without having to pass through a long push rod.

Compared to a pushrod engine with the same number of valves (i.e., overhead valve structure), the overhead camshaft structure requires far fewer reciprocating components, thus greatly simplifying the valve structure, significantly reducing the weight of the engine, while also improving transmission efficiency and reducing operating noise.

According to the number of camshafts contained in the valve structure, overhead camshafts can be divided into the following two forms:

Single Overhead Camshaft (SOHC).

Double overhead camshafts (DOHC).

Intake valves, exhaust valves, valve guides, valve springs, tappets, push rods, camshafts and timing gears, etc.

1. Valve group: including valves, valve guides, valve seats, valve locks and valve springs and other parts.

2. Valve transmission group: including camshaft, timing gear, tappet (push rod), rocker arm, rocker shaft, rocker arm bracket and timing chain tensioning mechanism.

In order to ensure that some of the gas inside can enter the cylinder, in order to exhaust the useless gas inside, it is composed of springs, valves, guides, gears, tappets, and these.

The combustible mixture can be sucked into the cylinder in time, and the exhaust gas inside can be discharged, so that the engine can work better, and the main components that make it include valves, guide valves, valve mains, and springs.

In order to allow some gas to enter the cylinder duct, and some exhaust gas is exhausted, it is composed of valves, exhaust valves, cylinders, gas valves, and switches.

It is mainly to inhale and expel gases. This will ensure that the engine is working properly. Including valves, tappets, push rocker swing arm swivel, push rods, springs and more.

What is the function of the valve mechanism.

The valve mechanism is used to open and close the intake and exhaust valves periodically according to the working sequence and ignition sequence of each cylinder, so that fresh combustible mixture can enter the cylinder and exhaust can be discharged from the cylinder. All engines have a valve train, which consists of valves and a valve drivetrain. Generally, car engines use double overhead camshafts with two camshafts, one to control the intake valve and the other to control the exhaust valve.

Some cars are also equipped with variable valve timing and variable valve lift systems. In such cars, there is usually a special mechanism on the camshaft to change the valve lift and timing. The valve train is very important for the engine.

If the valve train is properly designed, the engine will be more efficient and the fuel economy will be good. There are five major systems and two major mechanisms in a car engine, namely the crank linkage mechanism and the valve mechanism. The five major systems are the starting system, the lubrication system, the cooling system, the oil supply system and the ignition system.

It is the heart of the car. The engine is responsible for providing power. This engine is quite complex.

A good engine is powerful and fuel-efficient, while a bad engine is weak and expensive. The valve train is very important for the engine. Most cars have a four-valve design, i.e., two intake valves and two exhaust valves.

The valve mechanism is also timed. If the timing of the valve train fails, it will lead to insufficient engine power or even engine failure. Some in-cylinder direct injection engines are prone to carbon deposits on the back of their valves, and it is recommended that owners who use in-cylinder direct injection engines regularly clean up the engine carbon deposits.

A better way to remove carbon deposits is walnut sanding. Many auto repair shops are using the method of hanging bottles to clean up carbon deposits. In fact, this method does not work very well.

It is not recommended for riders to use the hanging bottle method to clean up carbon deposits. Some engine throttles can also generate carbon deposits when used for a long time. After the throttle has generated carbon deposits, the rider can remove the throttle to clean up the carbon deposits.

The engine valve mechanism is in accordance with the requirements of the working cycle and ignition sequence carried out in each cylinder of the engine, which can play a role in opening and closing the intake and exhaust valves of each cylinder at regular intervals, so that fresh combustible mixture or air can enter the cylinder in time and the exhaust gas can be discharged from the cylinder in time.

Components: The valve train includes 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.

The valve train is composed of camshafts, tappets, push rods, rocker arms, rocker arm shafts, valve springs and valve guides 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 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.

The functions and components of the valve mechanism are as follows:

1.The function of the gas distribution mechanism:

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.

2.Component composition of the valve mechanism:

Both the intake and exhaust valves are hung upside down on the cylinder head. The valve group includes 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.

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 tell you some parts about the valve mechanism. If you are interested, it may be helpful to you.

The valve train is composed of the following parts: valve group: including valves, valve guides, valve seats, valve locks, valve springs and other parts.

Valve actuation group: including camshaft, timing gear (or timing chain and sprocket, timing belt), tappet (pusher), rocker arm, rocker shaft, rocker arm bracket and timing chain tensioning mechanism, etc. The engine valve train (internal combustion engine valve mechanism) follows the requirements of the working cycle and ignition sequence of each cylinder of the engine, and opens and closes the intake and exhaust valves of each cylinder regularly, so that the fresh combustible mixture (gasoline engine) or air (diesel engine) immediately enters the cylinder, and the exhaust gas is immediately discharged from the cylinder.

During compression and power stroke, the valve is closed to ensure the sealing of the combustion chamber. The requirements of the valve mechanism are that the main structural parameters and forms are conducive to shortening the intake and exhaust resistance, and the opening time and continuous opening time of the intake and exhaust valves are quite moderate, so that the intake and exhaust basically make full use of their best efforts to obtain greater power torque and exhaust performance. The degree to which fresh mixture or air is filled into the cylinder is expressed in terms of inflation efficiency.

The higher the inflation efficiency, the more fresh air or combustible mixture enters the cylinder, the more heat emitted by the combustion mixture, and the more power the engine will have. For an engine with the necessary volume (V), the mass is related to T and P at the end of the intake. The lower the T and P of the intake, the greater the intake mass and the higher the inflation efficiency.

However, the pressure in the cylinder at the end of the intake will decrease due to the resistance of the intake system to the gas, and the temperature of the gas at the end of the intake will increase due to the high temperature exhaust gas left over from the previous cycle. The mass of the actual intake air is always less than the mass of the gas charged into the cylinder in most states. Therefore, the efficiency of inflation is always less than 1.

Mostly, it is.