Hitachi Automotive Systems Steering, Ltd.

Yoshiaki Kido

Satoshi Muramatsu

Norikazu Kumasaka

Masaaki Aoki

Yutaka Ogiwara

A variable displacement vane pump includes first and second sealing grooves formed on an intake port side and separated away from each other in a circumferential direction; first and second sealing members provided in the first and second sealing grooves; a first fluid-pressure chamber formed on a side on which a volume thereof decreases when the cam ring moves to a side on which an eccentricity of the cam ring increases; and a second fluid-pressure chamber formed on a side on which a volume thereof increases when the cam ring moves to a side on which the eccentricity of the cam ring increases; and a control valve configured to control the pressure in the first or second fluid-pressure chamber.

Variable displacement vane pump

A variable displacement vane pump includes a notch portion which is a flow path provided to extend from an initiating end of a discharge port towards a terminating end side of a suction port. The notch portion is formed so that a sectional area of the flow path is smaller than a sectional area of the discharge port at the initiating end thereof and that a length of the flow path in a circumferential direction is 1.5 pitches or larger. The terminating end of the suction port is a point where the vane in the suction area last overlaps the suction port. The initiating end of the discharge port is a point where the vane departed from the suction area first overlaps the discharge port. One pitch is a distance defied in the circumferential direction between adjacent vanes of the plurality of vanes.

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Atsugi, Japan

Yoshiaki Kido