External gear pump with pressure fluid pre-loading

Details External gear pump with pressure fluid pre-loading External gear pump with pressure fluid pre-loading

2005-08-30

2005-08-30

Trieu, Theresa (Department: 3748)

Rotary expansible chamber devices

With plural working fluid inlet or outlet passages

C418S140000, C418S180000, C418S206100, C417S310000

Reexamination Certificate

active

06935851

ABSTRACT:
External gear pump, comprising: a casing (3a,3b) with a gear chamber (4), comprising an inlet (5) for a fluid on a low pressure side and an outlet (6) on a high pressure side and comprising axial and radial sealing stays (7, 8); toothed wheels (1, 2) being in toothed mesh, wherein the external toothings of the wheels (1, 2) form delivery cells (10) for the fluid which are axially sealed off by the axial sealing stays (7) and radially sealed off by the radial sealing stays (8); and at least one pressure fluid supply (15, 16) through which pressure fluid may be supplied to the low pressure side, wherein the at least one pressure fluid supply (15, 16) opens on the low pressure side into a delivery cell (10) which is radially opposed by one of the radial sealing stays (8).

REFERENCES:
patent: 2301496 (1942-11-01), Aldrich
patent: 2412588 (1946-12-01), Lauck
patent: 2489887 (1949-11-01), Houghton
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patent: 6312240 (2001-11-01), Weinbrecht
patent: 157744 (1932-10-01), None
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patent: 1553014 (1969-08-01), None
patent: 2116317 (1972-10-01), None
patent: 63005190 (1988-01-01), None

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