US 2001/0033803 A1Published application

Vane pump

AssigneeDelphi Technologies, Inc.

InventorsAlbert Cheuk-Yin Wong, Tom Cheuk-In Wong, Johnny M. Paris, Gary Ray Minnis

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Abstract

A vane pump includes a cylindrical rotor rotatable inside of an oval-shaped rotor chamber defined by a cam ring around the rotor. A thrust plate and a pressure plate on opposite sides of the cam ring cover the rotor chamber and are squeezed together by a pressure force attributable to fluid in a discharge chamber of the vane pump at a discharge pressure thereof. A first thrust face of the thrust plate is pressed against an end wall of a cavity of a pump housing in which the components are installed. Fluid at the discharge pressure is ported to one or more balance chambers between the thrust plate and the end wall of the housing. The balance chambers are defined by a gasket received in a groove of the first thrust face. Fluid at the discharge pressure within the balance chamber balances a fraction of the pressure force on the thrust plate on an opposite second thrust face thereof attributable to fluid discharged from a rotor chamber in which the rotor operates, in order to place the thrust plate in axial static equilibrium.

Claims14

Dependent claims

A vane pump comprising:

a pump housing having a longitudinal axis, a cavity for fluid, and an end wall of said housing exposed to said cavity;
a thrust plate disposed in said cavity having a first thrust face disposed in adjacent facing relation to said end wall of said housing and a second thrust face axially opposite said first thrust face;
a pressure plate disposed in said cavity in axially spaced relation to said thrust plate;
a cam ring disposed in said cavity between said thrust plate and said pressure plate, said cam ring having an inner cam wall defining a rotor chamber of said cavity;
a rotor supported in said rotor chamber for rotation about said longitudinal axis relative to said inner cam wall of said cam ring;
a plurality of vanes slidably supported by said rotor for radial reciprocation in communication with said inner cam wall of said cam ring operative to draw relatively low pressure fluid into said rotor chamber and expel the fluid under relatively high discharge pressure from the rotor chamber;
and
a resilient gasket disposed between said first thrust face of said thrust plate and said end wall of said housing defining at least one sealed balance chamber for accommodating a fraction of the high pressure fluid between said first thrust face and said end wall of said housing.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/781,539Filed 8 Feb 2001
Priority: 11 Feb 2000
Published: 25 Oct 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

F04C 15/0023
Sealing arrangements in rotary-piston machines or pumps: axial sealings for working fluid
F01C 21/10
Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00: outer members for co-operation with rotary pistons; Casings
F04C 2/3446
With vanes reciprocating with respect to the inner member: the inner and outer member being in contact along more than one line or surface
F04C
Rotary-piston, or oscillating-piston, positive-displacement machines for liquids