Hydraulic lash adjuster

Details Hydraulic lash adjuster Hydraulic lash adjuster

2007-02-15

2008-12-16

Eshete, Zelalem (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Tappet

C123S090550, C123S090560

Reexamination Certificate

active

07464678

ABSTRACT:
A hydraulic lash adjuster includes a cylindrical body having a central cylindrical bore. A hollow plunger is reciprocable in the bore and includes a reservoir chamber therein. The plunger has a close clearance with the bore. A high pressure chamber is defined by the plunger and a closed end of the bore. An orificed wall of the plunger separates the reservoir chamber from the high pressure chamber. A check valve is disposed in the orifice for allowing one-way flow of oil from the reservoir chamber to the high pressure chamber. A plunger spring disposed in the high pressure chamber urges the plunger away from the closed end of the bore. A seat is disposed at an end of the plunger distal from the high pressure chamber. The plunger includes a circumferential groove proximate the seat for holding oil to maintain an oil seal in the clearance to limit leakage of air through the clearance.

REFERENCES:
patent: 6460499 (2002-10-01), Mason et al.

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