Disc brake apparatus

摘要

An abutment-plate portion of a main body portion of a biasing member, which faces a disc rotor in an axial direction, includes a pad-return portion for biasing a friction pad in a direction separating apart from the disc rotor, and upper and lower claw portions which are located separately on the upper and lower sides of the pad-return portion. The upper and lower claw portions of the biasing member are brought into abutment against upper and lower groove portions respectively with a frictional resistance When a lining of the friction pad is worn away and the friction pad is pressed in a direction approaching to the disc rotor in accordance with the wear of the lining, the movement of the entire biasing member in the direction approaching to the disc rotor inside a pad guide is allowed by the upper and lower claw portions serving as wear-following portions.

主权项

1. A disc brake apparatus, comprising:
a caliper to be mounted to a non-rotating portion of a vehicle; a friction pad including a lining made of a friction material, the friction pad being provided to face the disc rotor and pressed by the caliper toward the disc rotor; two guide surfaces provided to the caliper, the two guide surfaces extending in a direction of movement of the friction pad; and a biasing member to be brought into abutment against the two guide surfaces and provided so as to be movable in a direction approaching to the disc rotor in accordance with wear of the lining of the friction pad, wherein: the biasing member comprises: a main body portion;
a first spring part extending from the main body portion such that the first spring part can be flexurally deformed, the first spring part being configured to be brought into abutment against the friction pad at the distal end of the first spring part for biasing the friction pad relative to the main body portion in a direction separating apart from the disc rotor; anda second spring part, provided separately from the first spring part and configured to be brought into abutment against one of the two guide surfaces, for biasing the main body portion toward the other of the two guide surfaces; and the second spring part restricts the movement of the biasing member relative to the caliper until the first spring part is elastically deformed by a predetermined deflection amount by the movement of the friction pad.