Dedicated rocker arm engine brake

Abstract

A system for actuating an engine valve is disclosed. The system may include a rocker arm shaft () having a control fluid supply passage () and an exhaust rocker arm () pivotally mounted on the rocker arm shaft (). A cam () for imparting main exhaust valve actuation to the exhaust rocker arm () may contact a cam roller associated with the exhaust rocker arm. A valve bridge () may be disposed between the exhaust rocker arm () and first and second engine valves (). A sliding pin () may be provided in the valve bridge (), said sliding pin contacting the first engine valve (). An engine braking rocker arm () may be pivotally mounted on the rocker arm shaft () adjacent to the exhaust rocker arm (). The engine braking rocker arm may have a central opening, a hydraulic passage () connecting the central opening with a control valve (), and a fluid passage () connecting the control valve with an actuator piston assembly (). The actuator piston assembly may include an actuator piston () adapted to contact the sliding pin () during engine braking operation. A bushing () may be disposed between the engine braking rocker arm () and the rocker arm shaft (). The bushing may have a port () which registers with the hydraulic passage (). A cam () is provided for imparting engine braking actuation to the engine braking rocker arm (). A plate () is fastened to a back end of the engine braking rocker arm (), and a spring () biases the plate and the engine braking rocker arm () into contact with the cam ().