Structure for preventing cavitation erosion of oil pump

Details Structure for preventing cavitation erosion of oil pump Structure for preventing cavitation erosion of oil pump

2007-03-23

2008-11-25

Trieu, Theresa (Department: 3748)

Rotary expansible chamber devices

With mechanical sealing

Axially movable end wall or end wall portion

C418S131000, C418S206100, C418S206600, C418S206700

Reexamination Certificate

active

07455507

ABSTRACT:
A side face of a pump gear is formed into a stepped face such that an annular region extending radially from a diameter which is smaller than a dedendum circle diameter of the pump gear and larger than the outer diameter of a pump gear bearing to the addendum circle diameter of the pump gear is recessed by a certain depth to increase the side gap in the recessed annular region. Therefore, the side gap in the recessed annular region is larger than a side gap in a region between the diameter smaller than the dedendum circle diameter of the pump gear and larger than the outer diameter of the pump gear bearing to the outer diameter of the pump gear bearing.

REFERENCES:
patent: 2134153 (1938-10-01), Seyvertsen
patent: 3104616 (1963-09-01), Peet
patent: 3961872 (1976-06-01), Muller et al.
patent: 4056337 (1977-11-01), Zorn et al.
patent: 5022837 (1991-06-01), King et al.
patent: 5312236 (1994-05-01), Kishimoto
patent: 2002-266613 (2002-09-01), None

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