Hitachi, Ltd.

Yoshimasa Matsui

Jun Takahashi

Keisuke Nanri

Junichi Nagasawa

Yuichi Kobayashi

Tomoji Sato

Kiyotaka Nomura

A disk brake is provided which is free from problems attributed to the obverse-reverse orientation of a cover member as installed. A cylinder portion () slidably accommodating a piston is formed from a plate-shaped cover member () constituting the bottom thereof and a caliper body main part () having an opening () that is closed with the cover member (). The cover member () is joined to the caliper body main part () to close the opening (). A projection () is provided on one side of the cover member () that faces inside the cylinder portion (), and a blind hole () is provided on the other side of the cover member (). When the cover member () has been installed in the normal orientation, the blind hole () remains after the outer surface of the bottom of the caliper body has been subjected to face cutting after the installation of the cover member ().

Disk brake and method of producing the same

A disk brake has a flange portion formed on the outer periphery of a portion of a caliper body main body where an opening is formed. The opening is used for insertion of a cutting tool for machining of a cylinder bore. The outer diameter of the flange portion is larger than that of a general surface of the outer peripheral wall of the bore formed in the caliper body main body. A lid member is secured to the opening by friction stir welding. The flange portion ensures a sufficient welding margin. The overall weight of the disk brake is reduced by minimizing the wall thickness of the general surface of the outer peripheral wall of the bore.

Disk brake

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Yokohama, Japan

Yoshimasa Matsui