Nissin Kogyo Co., Ltd.

Toshiaki Mitani

Takayoshi Shinohara

Mitsuhiro Hanaoka

Akira Hiratsuka

Hiroo Kawakami

Osamu Ueno

Koji Usui

Hidemitu Sunohara

One embodiment provides a vehicle brake apparatus, including: an electric actuator; and a drum brake. The drum brake is attached to a wheel so as to be driven by power exhibited by the electric actuator. In a state of being mounted on a vehicle, the electric actuator is disposed and fixed further rearwards than an axle of the wheel.

Vehicle brake apparatus

A cup sealincludes a base portion, an inner circumferential lipslidingly contactable with a plungerand an outer circumferential lipcontactable with the bottom surfaceof the seal groove. Further, on the cup seal, there are provided elastic projectionsprojecting from the outer circumferential side leading end of the inner circumferential liptoward the cylinder hole bottom portion. The length of the cup sealfrom the base end faceto the leading end portionsis set longer than axial length of the seal groove. When the cup sealis fitted into the seal groove, force is imparted on the inner circumferential liptoward the cylinder hole inner circumferential direction to energize the inner circumferential liptoward the piston all the time.

Cylinder device

In a booster shell reinforcing structure in a vacuum booster which makes a booster shell rigid enough to withstand the load applied thereto during operation and reduces the weight thereof, a reinforcement member includes an outer peripheral portion corresponding to a coupling angular portion between the flat portion and the tapered portion in a front shell half of the booster shell, being laid on an inner surface of the flat portion. The reinforcement member has a plurality of cuts formed in the outer peripheral portion at predetermined angular intervals so that each of the cuts is opened outside the reinforcement member and closed with inner edges of the cuts in the radial direction of the booster shell, and a plurality of main reinforcing portions which are located between the cuts. The front shell half includes a plurality of raised portions corresponding in position to the cuts, each of the raised portions having a sloped plate portion interposing between the cylindrical portion and the flat portion near the respective inner edges of the cuts, being substantially U-shaped in section perpendicular to the radial direction, and opening towards a master cylinder.

Booster shell reinforcing structure in a vacuum booster

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Nagano, Japan

Toshiaki Mitani