Rotary machine shaft seal

Details Rotary machine shaft seal Rotary machine shaft seal

1992-04-13

1993-04-06

Cuchlinski, Jr., William A.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 58, 277153, F16J 1532

Patent

active

051997185

ABSTRACT:
A rotary hydraulic machine includes a housing, a shaft carried for rotation and extending from the housing, and a shaft seal carried by the housing in sealing engagement with the shaft to prevent leakage of fluid along the shaft. The shaft seal has an annular shell adapted for mounting to the housing surrounding the shaft and radially spaced therefrom. A pair of annular resilient sealing rings are carried by the shell and extend radially inwardly therefrom into rotary sealing engagement with the shaft. A pressure relief valve includes at least one opening that extends radially through the shell between the rings, and a resilient band surrounding the shell externally of and overlying such opening. Pressure of fluid urges the band away from the shell to permit flow of fluid through the shell opening externally of the shell and band, while the band prevents entry of dirt or debris through the opening into the shell.

REFERENCES:
patent: 2491233 (1949-12-01), Vedovell
patent: 2818283 (1957-12-01), Hutterer
patent: 3572379 (1971-03-01), Popa et al.
patent: 4085941 (1978-04-01), Wilkinson et al.
patent: 4174672 (1979-11-01), Cox
patent: 4337956 (1982-07-01), Hopper
patent: 4428630 (1984-01-01), Folger et al.
patent: 4448425 (1984-05-01), von Berger
patent: 4953876 (1990-09-01), Muller
patent: 5105636 (1992-04-01), Anastase et al.

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