Abstract: A vane pump comprising a pump housing, including an inlet, an outlet, and therein a hollow space, a cam ring received in the hollow space, a rotor placed in the cam ring and defining a rotation axis. The rotor comprises plural vanes arranged in corresponding slots formed in the rotor with a slidable contact in a radial direction of the rotor. A first wall member is received in the hollow space, one side of the first wall member faces one side of the cam ring, and the first wall member comprises an intake passage provided with a groove that is formed so that a partition wall portion is defined between the intake passage and an interface between the first wall member and the cam ring. A pair of intake ports are formed on the one side of the first wall member, each intake port is connected with the inlet by the intake passage, and a pair of outlet ports are formed on the one side of the first wall member.

Abstract: A vane pump comprising a pump housing, including an inlet, an outlet, and therein a hollow space, a cam ring received in the hollow space, a rotor placed in the cam ring and defining a rotation axis. The rotor comprises plural vanes arranged in corresponding slots formed in the rotor with a slidable contact in a radial direction of the rotor. A first wall member is received in the hollow space, one side of the first wall member faces one side of the cam ring, and the first wall member comprises an intake passage provided with a groove that is formed so that a partition wall portion is defined between the intake passage and an interface between the first wall member and the cam ring. A pair of intake ports are formed on the one side of the first wall member, each intake port is connected with the inlet by the intake passage, and a pair of outlet ports are formed on the one side of the first wall member.

Abstract: An axial plunger pump includes an auxiliary plate mounted to a cam plate at an end thereof on the side of a cylinder block to be rotatabe relative to the cam plate, and a flexible partition member interposed between a housing and the auxiliary plate to cover a drive shaft and the cam plate. The flexible partition member, which is in the form of, e.g. a metal bellows, serves to divide the inside of the housing into a working fluid chamber and a lubricant chamber.

Abstract: A hydraulic circuit supplies a controlled hydraulic flow rate to a hydraulically operated automotive component, such as, a power steering unit for satisfying the characteristic function thereof. The hydaulic circuit includes therein a flow control valve unit. In the flow control valve unit, throttle passages are provided each for throttling a hydraulic flow fed from a pump to increase its speed. Orifices are further provided in the flow control valve unit to regulate a hydraulic flow rate to be supplied toward the hydraulically operated automotive component. Each orifice functions to allow less hydraulic flow rate to pass therethrough toward the hydraulically operated automotive component corresponding to increasing speed of a hydraulic flow just upstream thereof.

Abstract: A variable capacity type vane pump comprising a cam ring, a rotor placed for rotation within the cam ring. The rotor has a number of radial slots, and vances placed for radial inward and outward movement in the receptive slots each having a bottom. A pump chamber is defined between the cam ring and the rotor and it has an inlet and outlet port. The outlet port is connected through a conduit to the bottom of at least one of the slots having vanes moving inwardly in the respective slots. A restriction orifice is placed in the conduit. The cam ring is moved with respect to the rotor to vary the capacity of the vane pump in response to a pressure differential across the restriction orifice.

Abstract: A fluid pump has a pressure chamber communicated with a discharge outlet via an orifice. A pressure difference responsive flow control valve is also provided for adjustment fluid flow rate through the discharge outlet. The flow control valve has a valve spool housed within a spool chamber. The spool chamber has one end directly opening to the pressure chamber.