Constant flow vane pump
AssigneeTesma International Inc.
InventorsCarlos Jeronymo, Jaroslaw Lutoslawski
Life of this patent
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Abstract
A variable capacity pump includes a housing and a rotatable rotor within the housing. The rotor includes radial slots to accommodate slidable vanes or rotor blades, wherein the vanes are urged outwards by centrifugal force into contact with the inner surface of a surrounding cam ring. The cam ring is surrounded on one end by a pressure chamber including a piston under hydraulic pressure, and on the other end by a seated spring. By controlling the pressure distributed to the pressure chamber, the position of the cam ring with respect to the rotor may be changed to automatically vary the displacement of the pump in response to a pressure differential across a restriction orifice, thereby regulating the output flow to be constant over a defined speed range.
Claims14
A variable capacity displacement pump comprising:
- a pump housing;
- a rotor rotatably mounted in said housing;
- a cam ring surrounding said rotor in said housing for pumping fluid through said housing between an inlet and an outlet fluid port;
- at least one pumping chamber defined between said cam ring and. said rotor for transferring fluid between said inlet and outlet ports;
- a pivot connection between said cam ring and said housing for providing movement of said cam ring within said housing independent of said rotor for varying the eccentricity of said rotor with respect to said cam ring;
- a first pressure chamber formed between the outer periphery of said cam ring and said housing;
- a piston operatively coupled to said housing for acting on the outer periphery of said cam ring;
- a biasing member operatively coupled to said housing opposite said piston for counteracting on the outer periphery of said cam ring;
- and a flow regulating control valve having a first end in fluid communication with said housing adjacent said piston and a second end in fluid communication with said outlet port for controlling the eccentricity of said cam ring relative to said rotor and the fluid flow from said outlet port in response to varying rotational speeds of said rotor.
A variable capacity displacement pump for an automotive vehicle comprising:
- a pump housing;
- a rotor rotatably mounted in said housing;
- a cam ring surrounding said rotor in said housing for pumping fluid through said housing between an inlet and an outlet fluid port;
- at least one pumping chamber defined between said cam ring and said rotor for transferring fluid between said inlet and outlet ports;
- a pivot connection between said cam ring and said housing for providing movement of said cam ring within said housing independent of said rotor for varying the eccentricity of said rotor with respect to said cam ring;
- a first pressure chamber formed between the outer periphery of said cam ring and said housing;
- a second pressure chamber formed between the outer periphery of said cam ring and said housing opposite said first pressure chamber;
- a spring biasing member operatively coupled to said housing opposite said second pressure chamber for counteracting on the outer periphery of said cam ring;
- and a flow regulating control member having a first end in fluid communication with said first pressure chamber and a second end in fluid communication with said second pressure chamber for controlling the eccentricity of said cam ring relative to said rotor and the fluid flow from said outlet port in response to varying rotational speeds of said rotor.
Dependencies are inferred from the claim text.