Disk brake

A disk brake comprising:

• a mounting member that extends over an outer periphery of a disk in its axial direction, the mounting member being provided with pad guides for travel of a friction pad where the pad guides are each separated in a rotational direction of the disk;
• a caliper that is movably provided with the mounting member and presses the friction pad to the disk by means of a piston installed;
• and
• a return spring made of a metallic plate that is provided between the friction pad and the mounting member and urges the friction pad in a return direction separating from the disk,
• wherein the return spring is composed of:
• a fixing portion that is fixed to the friction pad;
• and an extended portion where the extended portion is formed by being bent from the fixing portion as that a plate thickness direction of the extended portion extends along a radial direction of the disk, the extended portion extending in a direction separating from the disk, and a top end side of the extended portion is bent toward a side of the mounting member and elastically abuts to a side of the mounting member, and
• the friction pad is provided with an engagement portion at a central portion of the friction pad in the radial direction of the disk, the engagement portion engaging with the pad guide, and a top end side of the extended portion abuts to the mounting member to a position that deviates from the engagement portion of a back plate in inner radial and rotational directions of the disk, the top end side of the extended portion extending toward a rotational direction of the disk.

A disk brake comprising:

• a mounting member including:
• pad guides that extends over an outer periphery of a disk in its axial direction for travel of a frictional pad;
• and torque receivers that receive braking torque from the friction pad, each of the pad guides and each of the torque receivers being arranged in a radial direction of the disk;
• a caliper that is movably provided at the mounting member and presses the friction pad to the disk by means of a piston installed;
• a return spring made of a metallic plate that is provided between the friction pad and the mounting member and urges the friction pad in a return direction separating from the disk,
• wherein the return spring is integrally composed of:
• a fixing portion that is fixed to the friction pad;
• an extended portion that extends in a direction separating from the disk relative to the fixing portion where a top end side of the extended portion is folded toward a side of the mounting member and elastically abuts to a region corresponding to the torque receivers of the mounting member in a radial and a rotational direction of the disk;
• and a wear detecting portion that extends in a direction separating from the disk relative to the fixing portion where a top end side of the wear detecting portion is folded toward a side of the disk so as to make the top end side of the disk abutted to each other for detecting wear of a lining of the friction pad,
• wherein a plate thickness direction of a portion of the extended portion that extends in a direction separating from the disk is defined approximately by definable as extending along a radial direction of the disk, and
• wherein a plate thickness direction of a portion of the wear detecting portion that extends in a direction separating from the disk is defined approximately by a rotational direction of the disk.