Rotary expansible chamber devices – Moving cylinder – Rotating
Patent
1998-06-26
2000-07-18
Denion, Thomas
Rotary expansible chamber devices
Moving cylinder
Rotating
418126, 418189, 418 80, F01C 110
Patent
active
060898410
ABSTRACT:
A crescent pump including a housing having an inlet port and a discharge port, a driving gear, and a driven gear meshing with driving gear in a gap between the inlet and the discharge ports. External and internal troughs on the driving and the driven gears define pump chambers. A stationary crescent-body has a pair of arc-shaped walls which cooperate with the tips of the external and the internal gear teeth thereon in defining fluid seals. The edges of an inlet ramp at an upstream end of the crescent body and the edges of a discharge ramp at a downstream end of the crescent body define inner and outer upstream and downstream metering orifices which close and open in complementary fashion to maintain constant the rate of fluid leakage from the discharge port toward the inlet port. A pair of shaped metering grooves in the pump housing cooperate in defining a flow path between the discharge port and the inlet port through a succession of trapped volumes between the driving and the driven gears. The flow path has a pair of variable orifices therein calibrated to reduce the fluid pressure in the succession of trapped volumes at a controlled rate.
REFERENCES:
patent: 1624099 (1927-04-01), Haight
patent: 3597129 (1971-08-01), Crowther
patent: 3785756 (1974-01-01), Langenderfer
patent: 4130383 (1978-12-01), Moinuddin
patent: 4386892 (1983-06-01), Stich et al.
patent: 4850814 (1989-07-01), Hertell et al.
patent: 5163826 (1992-11-01), Cozens
patent: 5660531 (1997-08-01), Merkle et al.
Chen Francis Hap-Kwong
Meernik Paul Richard
Wang Liping L.
Denion Thomas
General Motors Corporation
Griffin Patrick M.
Grove George A.
Trieu Thai-Ba
LandOfFree
Crescent gear pump does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Crescent gear pump, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Crescent gear pump will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2030361