Lost motion rocker arm system with integrated compression brake

A system for controlling the actuation of an internal combustion engine valve to achieve compression-release braking or exhaust gas recirculation, said system comprising:

• means for supplying energy to an engine rocker arm;
• an engine rocker arm shaft including an internal hydraulic passage;
• an engine rocker arm mounted on the shaft, said rocker arm having a first end in operative contact with the energy supplying means, a piston recess in a second end, and a control valve recess intermediate said first and second ends, said rocker arm being adapted to rock cyclically on said shaft;
• a lost motion piston slidably disposed in the piston recess;
• an hydraulic control valve disposed in the control valve recess and having an outer end extending out of said recess, said control valve being adapted to reset responsive to the rocking movement of the rocker arm to a predetermined position;
• means for changing the extension of the control valve outer end out of the control valve recess;
• and
• an hydraulic subcircuit provided in the rocker arm;
• said subcircuit providing selective hydraulic communication between the shaft internal passage, the control valve, and the piston recess.

A system for controlling the actuation of an internal combustion engine valve, said system comprising:

• means for supplying energy to an engine rocker arm;
• an engine rocker arm shaft;
• an engine rocker arm mounted on the shaft, said rocker arm having a first end in operative contact with the energy supplying means, a piston recess in a second end, and a control valve recess intermediate said first and second ends, said rocker arm being adapted to rock cyclically on said shaft;
• a lost motion piston slidably disposed in the piston recess;
• and
• a control valve disposed in the control valve recess, said control valve being adapted to be selectively reset in response to interaction with an external stop.

A system for actuating an engine valve, said system comprising:

• a rocker arm having an integrated hydraulic system;
• a lower piston and an upper reset piston assembly disposed in the rocker arm hydraulic system, said lower piston being adapted to apply actuation motion to the engine valve;
• means for applying hydraulic pressure to the lower piston and upper reset piston assembly;
• and
• means for selectively resetting the upper reset piston responsive to rocker arm movement.

A system for controlling the actuation of an internal combustion engine valve, said system comprising:

• means for supplying energy to an engine rocker arm;
• an engine rocker arm shaft;
• an engine rocker arm mounted on the shaft, said rocker arm having a first end in operative contact with the energy supplying means, a piston recess in a second end, and a control valve recess intermediate said first and second ends, said rocker arm being adapted to rock cyclically on said shaft;
• a lost motion piston slidably disposed in the piston recess;
• and
• a control valve disposed in the control valve recess, said control valve being adapted to be selectively reset responsive to rocker arm motion.