Patent ID: 6718940
Filing Date: 2004-04-13
Classification: F01L,F02B

Abstract:
An assembly for operating an engine valve comprising:a rocker shaft; a rocker arm pivotally mounted on the rocker shaft, said rocker arm including a cavity at a valve actuation end, said cavity having an end wall; a hydraulic lash adjuster slidably disposed in the rocker arm cavity, said hydraulic lash adjuster including an outer plunger slidably received in the cavity and an inner plunger slidably received in the outer plunger, wherein said inner plunger is adapted to selectively contact the cavity end wall; a hydraulic passage provided in the rocker arm, said passage communicating with the rocker arm cavity; and means for (a) supplying hydraulic fluid to the passage during a positive power mode of engine operation and (b) cutting off the supply of hydraulic fluid to the passage during an engine braking mode of engine operation.