Delphi Technologies, Inc.

Gm Global Technolgoy Operations, Inc.

David R Aden

Thomas C Rytlewski

James Leroy Davison

Bruce Alan Tucker

Roy William Heath

David Fredrick Hammerbacher

Jerrod M Etienne

Scott William Clifford

James Leibinger

Jerod M Etienne

A hydraulic pump includes a housing, a primary discharge outlet, an auxiliary discharge outlet, and a flow control valve for controlling fluid flow from the primary and auxiliary discharge outlets. A first fluid passageway within the housing passes fluid from a first discharge port to the primary discharge outlet, and a second fluid passageway within the housing passes fluid from a second discharge port to a common port of the flow control valve. In a first position, the valve directs fluid from the second discharge port to the primary discharge outlet. In a second position, the valve diverts fluid from the second discharge port to the auxiliary discharge outlet. The valve may be positioned in response to such operating conditions as excessive pressure differential between the high and low-pressure sides, excessive pump rate of rotation (RPM), or excessive rate of fluid flow, among others.

Dual discharge hydraulic pump and system therefor

A sliding vane pump comprising a rotor housing having a pumping chamber, a rotor in the pumping chamber having a plurality of radially disposed slots, and a plurality of sliding vanes disposed in the slots configured to extend to follow an inner wall of said pumping chamber.

Sliding vane pump

This invention offers advantages and alternatives over the prior art by providing a dual port hydraulic fixed displacement pump which exhibits improved efficiency by limiting the volume of discharged fluid which is subjected to the line pressure of a hydraulic system through mechanical valve control. According to the present invention, a pair of discharge ports are provided, namely a first discharge port and a second discharge port. Under all operating conditions, e.g., low and high pump speed operating conditions, the fluid flowing within the first discharge port and primary discharge passageway is exposed to the working pressure of the primary line, which represents a high pressure line. The second discharge port fluidly communicates with a secondary discharge passageway which is in selective fluid communication with a low pressure line connected to a low pressure area of the pump (e.g., a reservoir) under first operating conditions and is also in selective communication with the first discharge port and the primary discharge passageway under second operating conditions.

Hydraulic pump with speed dependent recirculation valve

A hydraulic system for a motor vehicle having a first flow circuit for steering power assist and a second flow circuit for a radiator cooling fan. The first flow circuit includes a reservoir, a power steering pump connected to the reservoir through a first inlet conduit and a first return conduit, a steering assist fluid motor, and a first flow control valve. The second flow circuit includes the aforesaid reservoir, a second pump connected to the reservoir through a second inlet conduit and a second return conduit, a second fluid motor for the radiator cooling fan in the second return conduit, and a second flow control valve. Fluid in the first return conduit is conducted into the reservoir substantially without turbulence. Fluid in the second return conduit is conducted into the reservoir as a jet stream aimed at a submerged passage in a venturi tube. The submerged passage communicates with a feeder conduit between the reservoir and each of the first and the second inlet conduits. The kinetic energy of the jet stream is converted into fluid pressure in the feeder conduit and in each of the first and the second inlet conduits to suppress cavitation.

Hydraulic system for motor vehicle

Growing community of inventors

Saginaw, MI, United States of America

David R Aden