| 摘要 |
An electric caliper 12 includes an electric drive mechanism 20 which generates a pressing force for pressing a friction pad 13 against a disc rotor 11, and a retraction mechanism 40 provided in a piston 32 of a pressing mechanism 30. The mechanism 40 includes a reversing member 41 which is compressed by a force transmission portion 32a and a pressing portion 32b of the piston 32 to thereby generate a reverse force. Also, the mechanism 40 includes a movable element 42 which relatively retracts due to the reverse force, and a first elastic member 43 which is compressed by the movable element 42 and the advancing force transmission portion 32a to thereby apply a restoring force. Thus, in the mechanism 40, the reversing member 41 generates the reverse force as a result of advancement of the force transmission portion 32a, and the movable element 42 relatively retracts due to the reverse force and compresses the first elastic member 43. When free rotation (no-load rotation) of a brake motor 21 of the mechanism 20 is permitted, the restoring force generated as a result of compression of the first elastic member 43 is applied to the force transmission portion 32a, whereby the piston 32 is retracted. |
