Hydraulic lash adjuster with pressure relief check valve

Details Hydraulic lash adjuster with pressure relief check valve Hydraulic lash adjuster with pressure relief check valve

1998-08-24

1999-08-03

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

Rocker

123 9046, 123 9055, 123 9057, 123 9019, F01L 116, F01L 124

Patent

active

059311320

ABSTRACT:
A hydraulic lash adjuster mechanism for an internal combustion engine, the adjuster having a body with a bore formed therein, a plunger slidingly received within the bore, and a high pressure chamber formed between the bottom of the bore and the plunger. The plunger has a fluid chamber formed therein to receive engine fluid through an inlet opening and is in communication with a first check valve mechanism for regulating the flow of fluid from the fluid chamber through a valve opening into a high pressure chamber. A leak path allows fluid to escape from the high pressure chamber due to increased force on the plunger. The high pressure chamber is in communication with a second check valve mechanism for allowing fluid to leak from the high pressure chamber at an increased rate in response to increased force on the plunger.

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