| 摘要 |
PROBLEM TO BE SOLVED: To simplify the constitution of a coupling part of a push rod with a hydraulic piston, suppress the costs, and prevent the generation of striking sounds when a clutch pedal is stamped and application of a shock to the pedal. SOLUTION: A power piston is operated by the air introduced into a pressure chamber of a power cylinder, and the output therefrom is transmitted to a piston 22 of a hydraulic cylinder via a push rod 16 coupled with the power piston. An inserting hole 22a is formed at the end face of the hydraulic piston 22, and a ring groove 22b is formed at the inner surface of the hole 22a, while a ring groove 16b is also formed at the outer circumferential surface of the forefront of the push rod 16. A wire ring 41 is simultaneously fitted in these grooves 16b and 22b, and the push rod 16 is coupled with the hydraulic piston 22.
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