Lubrication of gear pump trunnions

Details Lubrication of gear pump trunnions Lubrication of gear pump trunnions

1989-08-03

1990-05-22

Vrablik, John J.

Rotary expansible chamber devices

Shaft or trunnion lubrication or sealing by diverted working...

418132, F03C 208, F04C 218, F04C 1500

Patent

active

049273434

ABSTRACT:
A thrust plate for a gear pump or motor which permits the use of high pressure fluid from the outlet side thereof to lubricate the trunnions and bushings therein. The thrust plates include two small bores which pass therethrough the which are in fluidic communication with the inlet side of the pump via the surface of the thrust plate that confronts the gears within the pump. The foregoing bores are also in fluidic communication with the bushings by means of associated slots in the opposite side of the thrust plate. The opposite ends of the bushings are in fluidic communication with fluid at atmospheric pressure. By minimizing the size of the foregoing bores and by allowing the passage of fluid through same to the inlet side of the pump via the gear tooth confronting surface of the thrust plate, pressure gradients are created across the trunnions and their associated bushings. These pressure gradients permit high pressure fluid to traverse outwardly from the thrust plate along the surface of the trunnions to the approximate end thereof to lubricate same and then to move inwardly along the trunnions toward the thrust plate and to pass therethrough via the bores therein.

REFERENCES:
patent: 3076413 (1963-02-01), Hoffer
patent: 3690793 (1972-09-01), Pollman et al.
patent: 4392798 (1983-07-01), Bowden
patent: 4470776 (1984-09-01), Kostek et al.

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