Hitachi Automotive Systems, Ltd.

Hayuru Inoue

Yoichi Kumemura

Hitoshi Yoshida

Seiko Tanabe

Daisuke Tanabe

Shigeru Hayashi

Koji Fukui

Takeshi Fujiki

Koichi Masuko

Seiko Tsubota

Shoichi Noguchi

An urging spring () urges a friction pad toward the exit side of the rotational direction of a disk when a vehicle equipped with the disk brake runs forward. The urging spring is disposed between a lug portion (A) of the friction pad and a torque receiving surface () of a carrier (). The distal end of the urging spring is configured to abut against the disk to perform wear detection. The urging spring includes a mounting portion (A), a first extending portion (B), a boundary region (E), a bent portion (C), and a second extending portion (D). The boundary region is reduced in width to lower stiffness. The bent portion is increased in width and provided with reinforcing portions, thereby enhancing the stiffness. Thus, the natural frequencies of the second extending portion in the rotational direction K and the vertical direction J come close to each other.

Disk brake

A disc brake that suppresses braking noises when a vehicle moves backward include an urging spring urging a friction pad toward a rotationally exiting side of a disc when the vehicle moves forward, the urging spring being arranged between a hook portion of the friction pad and a torque receiving portion of a carrier. The urging spring formed through bend of an elastic plate material has its spring constant that is set to be a small value to avoid resonance frequency causing noise where the base end side thereof is fixed to the hook portion of the backing plate while the top end side thereof elastically abuts to the torque receiving portion of the carrier. The urging spring is located at the position that is outside in the radial direction from the center position of the hook portion in its width direction.

A pressing part is provided at a disk-circumferentially central portion of a base plate member of a shim plate. The pressing part presses a friction pad at the center in the disk circumferential direction of the friction pad when a piston starts to press the friction pad. The pressing part is formed by slitting and raising the disk-circumferentially central portion of the shim plate along the disk radial direction. When the pressing force of the piston is in a low pressure range, the pressing force is transmitted to the friction pad through the pressing part. After the pressing force of the piston has exceeded the low pressure range, the pressing force is transmitted to the friction pad through the whole region in the disk circumferential direction of the piston.

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Kawasaki, Japan

Hayuru Inoue