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What is the hydraulic tappet of a car? what's the effect?

Update:26 Sep 2021
Summary:

The hydraulic tappet uses the pressure of the engine lu […]

The hydraulic tappet uses the pressure of the engine lubricating oil to adjust its own length to compensate for the valve clearance caused by thermal expansion, wear and other factors in the valve transmission mechanism to reduce to a minimum. The hydraulic tappet can keep the engine valve mechanism in good airtightness during the working process and ensure the smooth operation of the engine.

The hydraulic tappet is always in contact with the camshaft and runs without clearance. 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. Play the role of automatically adjusting the valve clearance.

When the engine is working, when the valve is closed, the oil enters the plunger cavity through the tappet body and the orifice of the plunger, pushes the one-way valve straight into the tappet body cavity, and the plunger rises under the action of the oil pressure of the tappet body cavity and the spring. Tighten the valve push rod. At this time, the rising 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.

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