Multi-discharge hydraulic vane pump

A multi-discharge hydraulic vane pump, comprising:

• a) a pump body including an interior pumping chamber and defining a axially extending inlet port for allowing fluid to be provided to the interior pumping chamber and four discharge ports for allowing pressurized fluid to be discharged from the interior pumping chamber;
• b) a cam ring disposed within the interior pumping chamber and defining a continuous peripheral cam surface;
• c) rotor mounted for axial rotation within the interior pumping chamber and defining a pump axis;
• d) a plurality of circumferentially spaced apart radially extending vanes mounted for radial movement within slots formed in the rotor, the plurality of vanes defining an equal number of circumferentially spaced apart volume chambers which extend between an outer periphery of the rotor and the cam surface for carrying pressurized fluid;
• and
• e) axially opposed first and second wear disks disposed within the interior pumping chamber.

A hydraulic vane pump, comprising:

• a) a pump body including an interior pumping chamber and defining an inlet port for allowing fluid to be provided to the interior pumping chamber and at least one discharge port for allowing pressurized fluid to be discharged from the interior pumping chamber;
• b) a cam ring disposed within the interior pumping chamber and defining a continuous peripheral cam surface, the cam ring also defining a plurality of inlet chambers and discharge chambers, the inlet chambers being arranged and configured to receive fluid from the inlet port and to distribute the fluid to the interior pumping chamber, the discharge chambers communicating with the interior pumping chamber and are arranged and configured to facilitate the discharge of pressurized fluid from the interior pumping chamber;
• c) a rotor mounted for axial rotation within the interior pumping chamber and defining a pump axis;
• d) a plurality of circumferentially spaced apart radially extending vanes mounted for radial movement within slots formed in the rotor, the plurality of vanes defining an equal number of circumferentially spaced apart volume chambers which extend between an outer periphery of the rotor and the cam surface for carrying pressurized fluid, wherein each vane slot has an under-vane pocket for receiving pressurized fluid based on an angular position of the rotor;
• and
• e) axially opposed first and second wear disks disposed within the interior pumping chamber, the first wear disk having an outer periphery which is positioned radially inward of the cam surface and is axially biased towards a first end surface of the rotor so as to provide for thermal expansion of the rotor and vanes and the second wear disk being positioned adjacent to a second end surface of the rotor.