Gear pump and liquid injection apparatus

Details Gear pump and liquid injection apparatus Gear pump and liquid injection apparatus

2007-11-20

2007-11-20

Denion, Thomas (Department: 3748)

Rotary expansible chamber devices

With mechanical sealing

Axially movable end wall or end wall portion

C418S206600, C418S149000

Reexamination Certificate

active

11002232

ABSTRACT:
A gear pump includes a housing defining an accommodating chamber and a cover for sealing the accommodating chamber. The accommodating chamber accommodates a drive gear and a driven gear. Each of the drive gear and the driven gear includes an upper surface opposed to the cover and a lower surface opposed to the housing. An annular projection projects from the upper surface of the drive gear or the driven gear for contacting the seal plate. An annular projection projects from the lower surface of the drive gear or the driven gear for contacting the seal plate. The gear pump is capable of lowering the load when the drive gear and the driven gear are rotated.

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