External toothed wheel pump comprising a relieving pocket

Details External toothed wheel pump comprising a relieving pocket External toothed wheel pump comprising a relieving pocket

2007-03-09

2010-02-02

Denion, Thomas E (Department: 3748)

Rotary expansible chamber devices

Interengaging rotating members

Like rotary members

C418S021000, C418S189000, C418S206100

Reexamination Certificate

active

07654806

ABSTRACT:
An external toothed wheel pump, comprising a delivery chamber comprising an inlet and an outlet for a fluid; a first feed wheel and a second feed wheel which can be rotationally driven for delivering the fluid and are in a toothed engagement with each other which separates the outlet from the inlet; and sealing surfaces which axially face the feed wheels and form axial sealing gaps with the feed wheels, wherein at least one of the sealing surfaces comprises a relieving pocket on a high-pressure side of the delivery chamber only and except for the relieving pocket, extends circumferentially up to at least the root circle and tip circle of the axially facing feed wheel.

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