Hitachi Astemo Ltd.

Satoshi Nakamura

Shigeru Hayashi

Katsuhiro Takahashi

Naoki Toguri

Shoichi Noguchi

Yuki Sato

Dian Utama Akmal

Toshiko Watanabe

This disc brake includes a cylinder bore into which a piston is fitted, a seal groove provided in the cylinder bore as an annular groove, and a seal member which has a rectangular cross section shape and which is fitted into the seal groove and seal a space between the piston and the cylinder bore. The seal groove includes a bottom surface portion, a side surface portion, and a chamfered portion. The chamfered portion is formed to expand an opening of the seal groove in the axial direction of the cylinder bore and has two types of curvature radii (rand r).

Disc brake

At least one of a pair of pad springs includes a guide plate portion for guiding an ear portion of a corresponding friction pad in a disc axial direction. The guide plate portion includes a first plate portion, a second plate portion, and a bottom plate apportion. A radially biasing portion is configured to elastically bias the ear portion of the friction pad toward the first plate portion; and a rotational direction biasing portion is configured to bias the friction pad in a rotational direction of a disc. The second plate portion is provided with an open portion at a position shifted inward from a middle position in the disc axial direction. The rotational direction biasing portion includes a main biasing portion configured to bias the friction pad inward in the disc rotational direction, and a sub biasing portion arranged across the open portion away from the main biasing portion.

Growing community of inventors

Minami-Alps, Japan

Satoshi Nakamura