Power steering pump drive shaft seal area drain structure

Details Power steering pump drive shaft seal area drain structure Power steering pump drive shaft seal area drain structure

1981-06-08

1984-01-03

Vrablik, John J.

Rotary expansible chamber devices

With mechanical sealing

418133, F04C 200, F04C 1500

Patent

active

044240147

ABSTRACT:
A remote reservoir power steering type pump has a shaft seal which prevents shaft bearing lube flow from leaking to atmosphere. The lube flow is derived from internal pump leakage along the shaft. This fluid must be returned to the main system fluid. In remote reservoir type pumps, the pressure inside the pump housing is greater than atmospheric pressure due to the supercharge gained through aspiration. The shaft seal area is maintained at substantially atmospheric pressure by bleeding or draining this area to the supply port which is not subjected to the supercharge pressure thereby maintaining the seal area at the lower pressure.

REFERENCES:
patent: 2766700 (1956-10-01), Klessig
patent: 2996013 (1961-08-01), Thompson et al.
patent: 3272138 (1966-09-01), Connoy et al.
patent: 3645647 (1972-02-01), Ciampa et al.
patent: 4203287 (1980-05-01), Bennett

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