Rocker arm assembly

Details Rocker arm assembly Rocker arm assembly

1997-02-06

1998-01-20

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

Rocker

123 9055, F01L 124

Patent

active

057091811

ABSTRACT:
A rocker arm and hydraulic lash adjuster assembly is disclosed. The assembly includes a shaft mounted rocker arm having a valve actuating arm portion which includes a stepped bore for slidingly receiving a hydraulic element. The bore has an open end, a cylindrical wall and a closed end having a spot face formed therein, and fluidly connected via a passage in the rocker arm to a source of pressurized fluid. The stepped bore is configured to receive a flat wear plate in abutment with the closed end and the hydraulic element such that the wear plate and the hydraulic element cooperate to define a fluid reservoir therebetween for pressurized fluid. The wear plate includes a centrally located through-bore operable to fluidly connect the fluid reservoir and the spot face formed integrally with the closed end of the stepped bore to define a passage from the source of pressurized fluid to the fluid reservoir to thereby fill the hydraulic element with pressurized fluid. The wear plate and hydraulic element cooperate to retain fluid within the fluid reservoir following a loss of pressurized fluid through operation of the centrally located through-bore extending through the wear plate which raises the level of the fluid in the fluid reservoir.

REFERENCES:
patent: 4624224 (1986-11-01), Kodama et al.
patent: 4699094 (1987-10-01), Stegeman
patent: 4729350 (1988-03-01), Speil
patent: 4815424 (1989-03-01), Buuck et al.
patent: 4856468 (1989-08-01), Speil et al.
patent: 5172663 (1992-12-01), Fujiwara

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