Rotary expansible chamber devices – Grooved abutting cylinder-rotating member end surfaces – Groove communicates with vane slot
Patent
1992-07-24
1994-03-01
Bertsch, Richard A.
Rotary expansible chamber devices
Grooved abutting cylinder-rotating member end surfaces
Groove communicates with vane slot
418131, 418133, 418135, 418268, 417310, F01C 2100
Patent
active
052901556
ABSTRACT:
The balanced vane hydraulic pump designed for automotive power steering applications employs a two-piece aluminum housing construction, a cam ring, rotor flow regulating valve, a high pressure gallery, and a pressure plate, all located in the rear housing section, and a set of needle bearings located in the front housing section for supporting the pump drive shaft from one end only. The pressure plate has a sculpted portion which communicates with the cam ring side of the pressure plate. The sculpted portion is a wishbone-shaped gallery and a low pressure area, recessed within the face of the pressure plate. The pressure plate also includes high pressure windows which deliver high pressure fluid from the cartridge to the high pressure gallery located within the rear portion of the pump housing. An important feature of the pressure plate is that it uses hydraulically balanced low pressure and high pressure passageways which are contoured to efficiently direct the moving fluid within the pump which aides in minimizing the loss of energy within the pump's passageways. The front housing member, rear housing member and also the pressure plate, all employ a common symmetrical wishbone-shaped gallery as a low pressure fluid passageway which causes balanced low pressure hydraulic fluid to be delivered to two pairs of two diametrically opposed inlet windows adjacent to the low pressure inlet sectors of the cam ring. In an alternative embodiment, a thrust plate is located in the front housing member and encompasses similar wishbone-type low pressure galleries.
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Snow Douglas G.
Wilson Jerry L.
Basichas Alfred
Bertsch Richard A.
Deco-Grand, Inc.
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