Helical gear pump or gear motor with optimal relief grooves for

Details Helical gear pump or gear motor with optimal relief grooves for Helical gear pump or gear motor with optimal relief grooves for

1979-03-08

1981-09-22

Vrablik, John J.

Rotary expansible chamber devices

Trapped fluid relief

418201, F03C 208, F04C 216, F04C 1502

Patent

active

042907390

ABSTRACT:
In an external or internal gear pump or gear motor with one pair of helical spur gears, the trapping of fluid in the enclosed tooth cavity and the risk for cavitation in the said enclosed tooth cavity is considerably reduced by the shift of the pressure port connected and the suction port connected relief grooves at the leading lateral face of the helical gears in the direction of the suction port and the shift of the pressure port connected and suction port connected relief grooves at the lagging lateral face of the helical gears in the direction of the pressure port.

REFERENCES:
patent: 1129090 (1915-02-01), Hawley
patent: 1233069 (1917-07-01), Leonard
patent: 1634023 (1927-06-01), Davison
patent: 1706829 (1929-03-01), Thomson
patent: 2147405 (1939-02-01), Horton
patent: 2338065 (1943-12-01), Ungar
patent: 2354992 (1944-08-01), Gottlieb
patent: 2884864 (1959-05-01), Bobnar

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