Aisin Seiki Kabushiki Kaisha

Advics Co., Ltd.

Nhk Spring Co., Ltd.

Hideki Yamamoto

Michiharu Nishii

Masaki Oishi

Shigemitsu Nohira

Atsushi Suzuki

Takashi Nagashima

Hiroshi Mizukami

Takashi Kurokawa

Yoshihiro Miyata

Kyousuke Hata

Tetsuya Honda

Yoshiyuki Katoh

An accumulator according to an embodiment includes, for example, a base member; a cover member welded to the base member, the cover member and the base member defining a pressure chamber therebetween; a stretchable partition member that partitions the pressure chamber into an inner chamber and an outer chamber; and a labyrinth structure provided in at least one of a first part of the base member and a second part of the cover member. The first part is located closer to the outer chamber than a welded part between the base member and the cover member. The second part is located closer to the outer chamber than the welded part, facing the first part.

Accumulator

A hydraulic brake system is proposed which includes a hydraulic booster for boosting brake operation, and a circulation type pressure control unit. The hydraulic brake system further includes a hydraulic booster including an auxiliary hydraulic pressure source, a pressure regulator for adjusting the hydraulic pressure supplied therefrom to a value corresponding to an operating amount of a brake operating member and introducing the thus adjusted hydraulic pressure into a boost chamber, and a boost piston for actuating a master piston with a force boosted by an assisting force generated by the hydraulic pressure introduced into the boost chamber. The hydraulic booster further includes a hydraulic line bypassing the pressure regulator and extending from the boost chamber to the auxiliary hydraulic pressure, and a check valve provided in the hydraulic line and configured to allow only a discharge of hydraulic pressure from the boost chamber into the auxiliary hydraulic pressure source.

Hydraulic booster and hydraulic brake system using the same

A hydraulic brake apparatus includes a master cylinder pressurizing brake fluid in a pressure chamber and outputting a hydraulic pressure to a wheel cylinder of a first brake circuit, and a pressure control valve controlling a hydraulic pressure of an auxiliary hydraulic pressure source outputting the controlled hydraulic pressure to a wheel cylinder of a second brake circuit, wherein a master cylinder piston includes a first passage which hydraulically connects the pressure chamber and a reservoir, and a switching valve which closes and opens the first passage, and wherein a throttle means and a check valve, which allows the brake fluid to travel only from the reservoir to the pressure chamber, are hydraulically provided in parallel with each other at the first passage at a position between the switching valve and the reservoir.

Hydraulic brake apparatus

A hydraulic pressure brake apparatus which smoothly adds the assistance force of a hydraulic pressure booster to a master cylinder piston after the assistance limitation by a negative pressure booster includes a negative pressure booster that assists a master cylinder piston, a hydraulic pressure booster that assists the master cylinder piston by outputting the hydraulic pressure of a hydraulic pressure pump after the assistance limitation of the negative pressure booster, and a valve mechanism that controls the assistance by the hydraulic pressure booster. A single reaction member in the form of a reaction force rubber disc is provided between the master cylinder piston and the hydraulic pressure booster to transmit the reaction force to a brake pedal via the reaction force rubber disc.

To provide an improved braking feeling in a hydraulic brake apparatus, the apparatus includes a pressure source, and a regulator for regulating pressure in the pressure source to a regulated pressure corresponding to the operation force of the brake pedal to supply the regulated pressure to a power chamber during operation of the brake pedal. The regulator includes a pressure increasing valve which establishes and interrupts a fluid communication between the pressure source and the power chamber and a pressure decreasing valve which establishes and interrupts a fluid communication between the power chamber and a reservoir. The apparatus also includes a booster having a power piston operated by the regulated pressure in the power chamber, and a master cylinder associated with at least one wheel brake and interlocked with the booster. A valve member applies the pressure in the pressure source to the power chamber irrespective of operation of the brake pedal. The valve member includes a first valve establishing and interrupting a fluid communication between the power chamber and the pressure decreasing valve and a second valve establishing and interrupting a fluid communication between the power chamber and the pressure source.

Hydraulic pressure brake apparatus

The present invention is directed to a hydraulic brake apparatus for applying braking force to each wheel of a vehicle in response to depression of a brake pedal. A master piston is received in a cylinder body to define a pressure chamber ahead of the master piston and a power chamber behind it. An auxiliary pressure source is provided for pressurizing the brake fluid in a reservoir to discharge power pressure. A control piston is slidably disposed in the cylinder body ahead of the master piston to be movable in response to movement thereof, so that a regulator chamber is defined ahead of the control piston, and a rear end thereof is exposed to the pressure chamber. A first passage is adapted to communicate the auxiliary pressure source with the power chamber, and a second passage is adapted to communicate the power chamber with the reservoir through the regulator chamber. A pressure increase valve device is disposed in the first passage to open or close the first passage in response to movement of the control piston. And, a pressure decrease valve device is disposed in the second passage to open or close the second passage in response to movement of the control piston. Preferably, a one way valve is disposed in the first passage, and a pressure restriction device may be disposed in the second passage.

Hydraulic brake apparatus for a vehicle

In an electromagnetic valve device, in order to secure a core assembly to a housing, an annular spacer is used. The annular spacer is fitted between a conical inner surface of a receiving portion of the housing and a conical opening of a casing. Since the conical opening of the casing is mounted on a tapered surface of a stationary core accommodated in the receiving portion of the housing, the core assembly is secured to the housing.

Growing community of inventors

Handa, Japan

Hideki Yamamoto