External gear type fluid displacing machine with bearing gap

Details External gear type fluid displacing machine with bearing gap External gear type fluid displacing machine with bearing gap

1975-07-17

1977-11-01

Vrablik, John J.

Rotary expansible chamber devices

With mechanical sealing

Axially movable end wall or end wall portion

F01C 1908, F03C 300, F04C 1500

Patent

active

040563375

ABSTRACT:
An external gear type hydraulic pump or motor wherein the trunnions of gears in the chamber of the housing are surrounded by annular bearing members. The peripheral surface of each bearing member defines with the adjacent internal surface of the housing an arcuate gap whose width increases in a direction toward the respective end face of the corresponding gear. To this end, portions of or the entire peripheral surfaces of bearing members and/or portions of or the entire internal surfaces of the housing have a conical or spherical shape. The gaps are located in the low-pressure zone and reduce the likelihood of wear upon those end faces of bearing members which are adjacent to the end faces of the gears because the bearing members can tilt in response to increasing load without localized rubbing against the gears. Additional gaps can be provided between the end faces of the gears and the adjacent end faces of the bearing members to further reduce the likelihood of uneven wear upon the bearing members.

REFERENCES:
patent: 3003425 (1961-10-01), Flowers
patent: 3270680 (1966-09-01), Rich
patent: 3309997 (1967-03-01), Kita
patent: 3481275 (1969-12-01), Gelin
patent: 3528756 (1970-09-01), Norlin et al.
patent: 3574492 (1971-04-01), Schwary

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