Oil pump

Details Oil pump Oil pump

2005-10-06

2008-09-23

Denion, Thomas (Department: 3748)

Rotary expansible chamber devices

Self-acting unidirectional flow with reverse rotation or...

C418S166000, C418S171000, C418S133000

Reexamination Certificate

active

07427191

ABSTRACT:
In an oil pump employing a cam ring, and inner and outer rotors in meshed-engagement, two housings are provided at opposite ends of the cam ring. A plurality of volume chambers are defined between inner and outer teeth of the rotors. Two axial holes are formed in the cam ring. A first one of the axial holes is positioned corresponding to a mesh portion having a minimum volume, whereas the second axial hole is positioned corresponding to a trap portion having a maximum volume. A suction port and a discharge port are formed at least in one of the housings and are open to the volume chambers between the mesh and trap portions. All are positioned at a line symmetry of an axis line between the mesh and trap portions. At least one of the two axial holes is formed as a slot extending along the axis lines.

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patent: 2005/0063851 (2005-03-01), Phillips
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