Patent ID: 6450144
Filing Date: 2002-09-17
Classification: F01L

Abstract:
An engine braking system, for providing a compression release valve event in an internal combustion engine, comprising:a rocker arm shaft; a hydraulic relief passage formed in the rocker arm shaft; a rocker arm having a central bore adapted to receive the rocker arm shaft, a piston bore, and an internal hydraulic passage connecting the piston bore to a surface port at the central bore; means for pivoting the rocker arm on the rocker arm shaft to provide a compression release valve event; and a lash piston disposed in a piston bore in the rocker arm, said lash piston being adapted to open an engine valve for the compression release event; wherein selective hydraulic communication between the hydraulic relief passage and the internal hydraulic passage at the surface port is adapted to release hydraulic fluid from the piston bore.