Gm Global Technolgoy Operations, Inc.

Antonio St Williams

John Joseph Burns

Paul Robert Van Heyningen

Oscar Alfredo Estratti

Donald R Smith

Michael Edward Mc Carroll

Daniel Patrick O 'Neill

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.

Rocker arm assembly

A valve actuation assembly for an internal combustion engine is disclosed in which a rotatable rocker arm assembly is actuated by an engine driven camshaft to move a poppet valve reciprocably. The rocker arm assembly includes a hydraulic lash adjuster for disposition between the rocker arm and the valve stem. The lash adjuster includes an actuator at one end having an axially extending neck which terminates in an enlarged head. The enlarged head engages a foot assembly which includes a disk having a socket in which the head is positioned. A retainer ring is disposed in the socket and includes a wall portion which operates to establish an interference fit with the socket so as to fix the ring in the socket and a radially inwardly extending flange member which operates to define an opening through which the actuator neck extends but having a diameter less than that of the enlarged head portion of the actuator to thereby prevent removal of the head from the socket.

Hydraulic element assembly

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Rochester, NY, United States of America

Antonio St Williams