What is a valve lifter

The car engine is an important part of the car, and various small parts of the engine are also very critical. The valve lifter is a small part inside the engine, so we also need to understand the relevant knowledge about the valve lifter and understand what is Valve tappet, working principle, etc. This is harmless to riders.

What is a valve lifter


1 The valve lifter is composed of a valve train and a valve drive train.

2 And the tappet is a main component of the valve train except the camshaft. The tappet is the follower of the cam. Its function is to transmit the movement and force from the cam to the push rod or valve, and at the same time bear the lateral force exerted by the cam and transmit it to the body or cylinder head.

3 Tappets can be divided into two categories: mechanical tappets and hydraulic tappets. In each category, there are a variety of structural forms such as plane tappets and hydraulic tappets.

The principle of valve lifters

1. In order to ensure the tightness of the valve closing, the valve stem There is a proper gap between the end and the valve driver (rocker arm, tappet or cam), which is called valve gap. The valve clearance is relatively small when the car is hot, and larger when the car is cold. This is because when the engine is running, the valve stem expands and stretches due to the increase in temperature, which causes the gap to shrink. If the valve clearance is not adjusted properly, the engine will operate abnormally. If the valve clearance is too large, it will affect the opening of the valve. Reduced valve lift will cause insufficient intake and incomplete exhaust. If the valve clearance is too small, the valve will not close tightly and cause air leakage, resulting in a decrease in power. . In order to avoid the trouble caused by improper valve clearance adjustment, hydraulic lifters that can adjust the valve clearance are generally used on high-speed engines.

2. One end of the tappet is in contact with the Engine Camshaft For Mercedes Benz, and the other end is in contact with the valve. Its function is to transmit the thrust of the Engine Camshaft For Mercedes Benz to the valve. One end of the tappet on the old engine is equipped with an adjustment screw and a lock nut to adjust the valve clearance, while the hydraulic tappet omits the adjustment screw and the lock nut, and hydraulic adjustment replaces the role of these rigid parts.

3. The hydraulic lifter is in contact with the camshaft at all times and runs without gaps. The inside of the tappet uses hydraulic power to adjust the gap. The hydraulic tappet is mainly composed of a plunger, a one-way valve and a one-way valve spring. It uses the function of the one-way valve to store or release oil. By changing the oil pressure in the tappet body cavity, the working length of the hydraulic tappet can be changed. , So as to automatically adjust the valve clearance.

4. When the engine is working, when the valve is closed, the oil enters the plunger cavity (a) through the tappet body (1) and the plunger (2), push the one-way valve (3) straight into it In the tappet body cavity (b), the plunger rises under the action of the oil pressure in the tappet body cavity and the spring (4) to compress the valve push rod (5). At this time, the lifting force of the plunger is not enough to overcome the tension of the valve spring, and the valve will not be opened but only eliminates the gap in the entire valve mechanism. At this time, the tappet body cavity is full of oil, and the one-way valve is closed under the action of the oil pressure and the spring (6), cutting off the oil path. When the cam (7) turns to the working surface, the tappet rises, the valve spring tension acts on the plunger through the valve push rod, but at this time the one-way valve is closed so that the oil cannot overflow, and the incompressibility of the oil makes The tappet pushes the valve open as a whole. During this process, due to the high oil pressure in the tappet body cavity, a little oil leaks out through the gap between the tappet body and the plunger, which 'shortens' the working length of the tappet. When the Engine Camshaft For Mercedes Benz turns over the working surface, the tappet descends, the valve closes, and the oil pressure in the tappet body cavity also drops, so the oil in the main oil passage opens the one-way valve again and injects it into the tappet body cavity to replenish oil, repeat Cycle the above actions.

5. Through the oil leakage and replenishment in the tappet body cavity, the working length of the tappet is continuously and automatically adjusted to keep the valve working normally without gaps in the entire mechanism, reducing the amount of inter-parts Impact and noise eliminate the drawbacks of the old engine valve clearance. At the same time, the use of hydraulic tappets can make the camshaft profile a bit more slender, making the valve opening and closing faster, and more in line with the requirements of modern high-speed engines.



The above is the relevant knowledge about valve lifters compiled by the editor for car fans. Car fans need to pay special attention to the small car engine when they understand the structure of the car engine. The problem with the parts. There are many small parts that make up a car engine. When we learn more about the relevant knowledge in our daily life, and as the driving age of the car grows, slowly we car friends can solve the small faults in the car.

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