Rotary expansible chamber devices – Interengaging rotating members – Like rotary members
Patent
1994-02-15
1995-02-21
Bertsch, Richard A.
Rotary expansible chamber devices
Interengaging rotating members
Like rotary members
418133, F01C 118
Patent
active
053910680
ABSTRACT:
A gear pump (11) is disclosed of the type comprising a housing (15,17) defining gear cavities (25) in which are rotatably disposed first (27) and second (29) gears. Each of the gears includes a gear portion and a generally cylindrical portion (37,39) on one axial side of the gear. The housing defines first (41) and second (43) cylindrical, internal pilot surfaces receiving and rotatably supporting the cylindrical portions of the gears. The engagement of each cylindrical portion and its respective internal pilot surface comprises substantially the only bearing support for the gear. One gear (27) comprises a drive gear and is driven by an input shaft (23) defining a bearing portion (51) received within a cylindrical pilot surface (55) defined by the housing. With the present invention, the primary pilot surfaces which need to be concentric are all defined by the same housing member, to facilitate accurate machining thereof. The input shaft (23) is a separate piece from the drive gear (27) and its size is not limited by the size of the gears, and may be readily replaced "in the field" without substantial disassembly of the pump.
REFERENCES:
patent: 1541435 (1925-06-01), Reller
patent: 2346761 (1940-04-01), Johnson
patent: 2649740 (1953-08-01), Murray et al.
patent: 3251309 (1966-05-01), Schmiel et al.
patent: 3421412 (1969-01-01), Ackley
patent: 3431862 (1969-03-01), Bottoms
patent: 3713759 (1973-01-01), Pollman et al.
patent: 4370110 (1983-01-01), Nagely
Bertsch Richard A.
Eaton Corporation
Freay Charles G.
Kasper L. J.
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