| 摘要 |
A master/slave hydraulic braking system for an internal combustion engine is disclosed for converting an engine from a power mode operation to a braking mode operation. A slave piston (12) operates in one of three positions including a fully retracted position in which one end thereof is spaced from the associated exhaust valve structure (2,4,8) by at least a predetermined lash sufficient to prevent contact between the actuating piston (12) and the valve structure (2,4,8) at all times during the power mode of engine operation, a brake actuated position in which the piston (12) is advanced sufficiently to open the exhaust valve (2,4) during the braking mode of engine operation and a brake ready position in which the piston (12) is advanced only far enough to take up the actual lash between the piston (12) and the associated exhaust valve structure (2,4,8) at all times during braking mode operation of the engine except when the actuating piston (12) is being advanced to open the exhaust valves (2,4). The disclosed system includes a lash take up means (58) including a biasing means (60) formed from a base support (62) attached to the actuating piston housing (16), an intermediate support (68) positioned between the base support (62) and one portion of the actuating piston (12), a first compression spring (70) extending between the intermediate support (68) and one portion of the actuating piston (12) for imparting a biasing force to the actuating piston (12) which tends to move the piston (12) from the brake ready position to the retracted position and a second compression spring (66) extending between the base support (62) and the intermediate support (68) for imparting to the piston (12) a biasing force which tends to move the piston from the brake actuated position to the brake ready position. First and second stop means (74 and 76) are arranged to provide for a selective adjustment of the fully retracted and brake ready positions of the actuating piston (12). |
