Donald L Shumate

US Patent:

40872165, May 2, 1978

Filed:

Oct 5, 1976

Appl. No.:

5/729782

Inventors:

Donald L. Shumate - Streetsboro OH

Assignee:

Permco, Inc. - Streetsboro OH

International Classification:

F04C 2700
F04C 2900

US Classification:

418 74

Abstract:

Method and apparatus are disclosed for counterbalancing the high pressure forces normally generated in the high pressure fluid region of a rotary pump or motor and exerted against the rotating structure of the pump or motor. By this method and apparatus a portion of the fluid in the high pressure region of the pump housing is transported to a region of the housing interior adjacent to, but out of communication with the low pressure fluid region. This transported high pressure fluid is directed against the rotating structure in the direction of the high pressure fluid region. Consequently, the rotating structure of the pump or motor is less subject to distortion or displacement due to forces generated by fluid in the housing's high pressure fluid region.

US Patent:

43114440, Jan 19, 1982

Filed:

Dec 3, 1979

Appl. No.:

6/099413

Inventors:

Donald L. Shumate - Streetsboro OH

International Classification:

F03C 208
F04C 218
F04C 1500

US Classification:

418 74

Abstract:

A reversible gear pump or motor capable of sustained operation under unusually high pressure conditions is provided with a unique diverter plate having pressure-transmitting paths in the ends of the plate which open to the gear teeth on both the high and low pressure sides of the pump or motor. In operation, the high pressure is transmitted through the specially formed paths to areas of the gears on the low pressure side. The pressure acts as a counter force which pushes the gears towards a centered position and reduces bearing loads without increasing the pressure forcing the gears towards one another.