Patent ID: 8672658
Filing Date: 2014-03-18
Classification: F01C,F04C

Abstract:
1. A vane pump comprising: a housing providing a walled control volume, said housing having an inlet and an outlet; a rotor having a rotatable axis and a plurality of radially movable vanes slidably connected with said rotor and contained by a cylindrical wall, said cylindrical wall being eccentrically located with respect to said rotatable axis, an outer diameter surface of said rotor is radially tapered along an axial length of said rotor to align with an inner diameter of said housing inlet, said inner diameter being smaller than the largest rotor diameter, wherein said rotor has cavities radially inward of an inner radial end of said vanes and wherein said cavities and an axial recess are pressurized by a path fluidly connected to said outlet; a single vane ring positioned within the axial recess of said rotor, wherein said single vane ring has an axial length of at least fifty percent of the axial length of said plurality of vanes.