Internal gear pump

Details Internal gear pump Internal gear pump

1987-07-15

1989-03-21

Freeh, William L.

Pumps

With condition responsive pumped fluid control

Inlet throttle or stop valve

417310, F04B 4902

Patent

active

048138533

ABSTRACT:
A hydraulic gear pump is disclosed wherein the meshing teeth of the gears define fluid cells which are expanded in the intake portion and receive the fluid from an inlet, and then compressed in the discharge portion to expel the fluid. The contact ratio of the cooperating driving flanks of the meshing teeth is smaller than the contact ratio of the cooperating sealing flanks of the meshing teeth, which serves to minimize the power requirement of the pump. The inlet to the pump includes at least two parallel lines which are each connected to a tank, and the first line is provided with a fixed throttle and the second line is provided with a pressure control valve which is controlled by the pressure in the pump discharge line.

REFERENCES:
patent: 1861155 (1932-05-01), Douglas
patent: 1863335 (1932-06-01), Hill
patent: 2428181 (1947-09-01), Sibley
patent: 2916999 (1959-12-01), Christenson et al.
patent: 2918009 (1959-12-01), Crevoisier
patent: 2997227 (1961-08-01), Ternent
patent: 3045778 (1962-07-01), Mosbache
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patent: 3619093 (1971-11-01), Harle
patent: 3898025 (1975-08-01), Bottoms
patent: 4443169 (1984-04-01), Merz
patent: 4480962 (1984-11-01), Niemiec
patent: 4553966 (1985-11-01), Boller
patent: 4642033 (1987-02-01), Boller
patent: 4674964 (1987-06-01), Hertell
W. Beitz et al., "Dubbel, Taschenbuch fur den Maschinenbau", Edition 14, 1981, cover sheet and p. 453.
82 Olhydraulik und Pneumatik, vol. 23, No. 11, 1979, pp. 803-805.

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