Hitachi Automotive Systems, Ltd.

Masaki Misunou

Chiharu Nakazawa

Ryohei Maruo

Toshihiro Koizumi

Masayuki Saito

A brake apparatus is provided which has applicability to a wide range of vehicles. The brake apparatus includes a master cylinder provided in such a manner that a piston is axially operable in a master cylinder housing, and a stroke simulator including a reaction force piston axially operable by brake fluid introduced into a stroke simulator housing. The master cylinder housing is fixed to the stroke simulator housing. The stroke simulator housing is positioned between the master cylinder housing and a fixation piece structured to fix the stroke simulator housing to the vehicle. The fixation piece is spaced from the master cylinder housing.

Brake apparatus and brake system

A brake apparatus improved in mountability on a vehicle is provided. The apparatus includes a master cylinderthat generates hydraulic brake pressure by a driver's brake operation, and a stroke simulatorthat creates an artificial operation reaction force of a brake operation member when the brake fluid flown out of the master cylinderenters the stroke simulator. The master cylinderand the stroke simulatorare integrally arranged to overlap each other in a perpendicular direction (as viewed from the perpendicular direction) when installed in the vehicle.

An object of the present invention is to provide a pump device that is capable of improving a discharge performance. A first orificethat is provided on a discharge oil passage (a pipe) of a pumpand a second orificethat, when a flow amount Q becomes greater than a predetermined flow amount Q, allows pass of brake fluid are provided.

Pump device

In a hollow seal member kept in abutted-engagement with a shaft hole formed in a housing via an elastic body and kept in sliding-contact with an outer circumference of a drive shaft for sealing against a leakage of fluid from a pump chamber, the seal member is provided with a seal part formed within an area at one end and kept in sliding-contact with the outer circumference of the drive shaft over a given hollow inner circumferential surface, and a rotation-stopping part formed within an area at the other end for restricting a movement of the seal member in a rotation direction of the drive shaft. A rotational resistance of the rotation-stopping part to the drive shaft is set to be less than a rotational resistance of the seal part.

Sealing for a pump device

A pump apparatus including a drive shaft and a driven shaft supported by bearing members, respectively, a center plate, first external gears, second external gears, first and second side plates, first and second seal members, a pressing means for applying a pressing force between the tooth tips of the respective external gears and the seal surface of the respective seal members in a closing region disposed between the respective external gears and the respective seal members, wherein contact between inner circumferential surfaces of the bearing members and an outer circumferential surface of the drive shaft is established on the side of the closing region, while the tooth tips of the respective external gears and the seal surface of the respective seal members in the closing region are kept pressed against each other by the pressing means.

Pump apparatus with pressing means

A pump assembly including a housing, a pump unit having a low pressure portion and a high pressure portion and accommodated in a pump unit receiving portion which is formed in the housing, a suction passage, a low pressure chamber communicated with the suction passage and the low pressure portion, and a discharge passage, wherein when the pump unit is accommodated in the pump unit receiving portion, the low pressure chamber is formed between the pump unit and a wall surface of the housing which defines the pump unit receiving portion, and the discharge passage is formed by a communication pipe which extends through the low pressure chamber and communicates the housing and the high pressure portion of the pump unit with each other.

Growing community of inventors

Atsugi, Japan

Masaki Misunou