The work of the hydraulic pusher
At a closed valve, oil from the engine lubrication system enters through the annular groove into the pusher. After passing the check valve in the pusher, the oil flows into the filled working cavity (high pressure cavity) and flows back completely).
In parallel with this, the pusher spring presses without play on the distribution chamber or on the cylinder at the end of the valve stem.
When the camshaft rotates and its cam presses on the pusher, the pressure in the working cavity increases. The non-return valve closes the inlet and prevents oil from escaping from the working cavity. Since the oil does not compress, a rigid connection is formed between the pusher and the cylinder. The valve can now be pushed down by the action of the cam.
After the valve is closed, due to oil leakage, a slight gap occurs in the valve mechanism, however, under the action of a spring, it presses the pusher up, it is immediately compensated again. Oil again enters the increased volume of the working cavity with the check valve open. The hydraulic pusher is ready for the next action on the valve.
Visitor comments