Cummins Engine Company, Inc.

Jim Kahlenbeck

John Jerl Purcell

A compression braking system is provided which permits an engine's exhaust valves to be operated by fuel pressure during a braking mode independently of the engine's mechanical actuating elements and associated control limitations. The present braking system includes a high pressure fuel supply including a high pressure fuel accumulating device for accumulating and temporarily storing high pressure fuel and an actuator device including an actuator piston operatively connected to the engine exhaust valve and a brake actuating valve for controlling fuel flow from the accumulating device to the actuator piston. The pressure of the fuel acting on the actuator causes movement of the exhaust valve. The system may include a pressure regulator for decreasing the accumulator fuel pressure to a more appropriate actuation fuel pressure to minimize high pressure joints and leakage. A improved sealing means may be provided for preventing leakage around the actuator piston. The braking system may further include a pressure reduction device for reducing the fuel pressure acting on the actuating piston after the initial movement of the piston.

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Columbus, IN, United States of America

Jim Kahlenbeck