US 2002/0119065 A1 · Cartridge vane pump having enhanced cold start performance

Abstract

A cartridge vane pump for a motor vehicle power steering system exhibits improved cold start performance. The pump includes a plurality of radially disposed vanes which are received within a rotor which is rotatably supported within a cylindrical cam ring defining two diametrically opposed pumping lobes. An inlet (upper) section and an outlet (lower) section engage the ends of the cam ring and define suitable passageways which provide fluid into and out of the pumping lobes. Under vane porting in the inlet section provides high pressure fluid to the inner edges of the vanes received within the rotor as they traverse the intake portions of the pumping lobes urging the vanes into contact with the cam ring surface.

Claims13

Dependent claims

A cartridge vane pump comprising, in combination,

a housing including a first end section, a second end section and a middle cam ring section disposed between said end sections and defining a pump chamber, said pump chamber defining intake regions of increasing diameter,
a rotor defining a plurality of axially and radially extending slots having inner ends and vanes disposed in respective said slots,
a shaft extending into said chamber for driving said rotor, and
one of said end sections defining arcuate passageways communicating with said inner ends of said vane slots and aligned with said intake regions of said pump chamber in fluid communication with a high pressure outlet of said pump.

1 more element

Dependencies are inferred from the claim text.

Cartridge vane pump having enhanced cold start performance

Life of this patent

Cartridge vane pump having enhanced cold start performance

Life of this patent

Abstract

Claims13