Vane pump

Details Vane pump Vane pump

2011-03-01

2011-03-01

Denion, Thomas E. (Department: 3748)

Rotary expansible chamber devices

Interconnected vanes

Integrally connected

C418S183000

Reexamination Certificate

active

07896631

ABSTRACT:
An oil supply groove12in communication with a pump room2A is formed above a bearing2B of a housing2, and an open air groove14in communication with an atmospheric air is formed at a position rotated around the bearing2B by 90° from the oil supply groove. In a shank3B of a rotor3, a branch passage11abranching from an oil passage11formed in its axial direction to the diametrical direction of the shank, and an open air passage13formed in the direction perpendicular to the branch passage are formed.Then, the branch passage and the oil supply groove communicate with each other, at the same time, the open air passage and the open air groove are arranged to also communicate with each other, and when the oil passage and the oil supply groove communicate with each other as the rotor stops, then an atmospheric air flowing in from the open air passage eliminates a negative pressure in the pump room, thereby the lubricating oil is prevented from flowing into the pump room in large quantities.An amount of the lubricating oil flowing into pump room at stop of the rotor can be reduced to prevent the vane from being damaged and an amount of the lubricating oil consumed due to rotation of the rotor can be controlled.

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