Gear pump

Details Gear pump Gear pump

1981-01-28

1984-04-17

Myhre, Charles J.

Rotary expansible chamber devices

Moving cylinder

Rotating

418 15, F04C 210, F04C 1504

Patent

active

044431694

ABSTRACT:
A gear pump having an annular internal tooth gear and an external tooth gear eccentrically rotative therein is provided with a choke bore at the inlet side of the pump and a series of outlet pressure bores. The outlet bores are valved with individual check valves so as to pass pressure oil from the pressure pockets between the relatively moving gear teeth which pockets diminish in volume at the outlet side of the pump as the teeth move therepast and the pressure pockets discharge into the outlet bores. Where a pocket is insufficiently filled to effect the pressure needed for opening the first valves moved pass by the pressure pockets, the pressure increases with continued rotation as pocket volume decreases. The increase in pressure in the pockets with volume reduction ultimately opens an outlet bore valve to effect discharge to a common high pressure chamber. Thus, when pump speed is increased, a reduction in inlet suction fails to fully fill the pockets at the inlet zone and the valving arrangement prevents short circuit of flow or back feed from the high pressure common outlet chamber to partially filled pressure pockets at the inlet side causing a recirculation and energy loss. Such partially filled pockets will ultimately discharge as they are reduced in size to force out the oil therein at a valve opening pressure. Provision is made to prevent flow between adjoining pressure pockets.

REFERENCES:
patent: 3170409 (1965-02-01), McLeod
patent: 3529617 (1970-09-01), Huber
Zahnradfabrik Friedrichshafen AG, Werk Schwabish Gmund, ZF Lenkungen, p. 27.

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