Seal for rotating shaft

Details Seal for rotating shaft Seal for rotating shaft

1997-09-30

1999-01-19

DePumpo, Daniel G.

Seal for a joint or juncture

Seal between relatively movable parts

Circumferential contact seal for other than piston

277549, 277562, F16J 1532

Patent

active

058606564

ABSTRACT:
When a rotating shaft is at a standstill, a first sealing lip of a first sealing element comes elastically into contact with the shaft, thereby preventing a fluid leakage. Annular grooves are formed on the inner peripheral surface of a second sealing lip of a second sealing element so that a wide contact surface pressure can be obtained between each two adjacent grooves. Accordingly, a fluid leaked from the first sealing element is prevented from leaking to the low-pressure side by means of the second sealing lip. When the rotating shaft is rotating, moreover, the fluid from a fluid chamber is allowed to permeate the gap between the outer peripheral surface of the shaft and the inner peripheral surface of the first sealing lip. Thus, the inner peripheral surface of the first sealing lip is lubricated by means of the fluid, so that the first sealing lip can be prevented from wearing or heating.

REFERENCES:
patent: 3913925 (1975-10-01), Gyory
patent: 4141563 (1979-02-01), Wu
patent: 4166628 (1979-09-01), Blaydon
patent: 4721314 (1988-01-01), Kanayama et al.
patent: 4723350 (1988-02-01), Kobayashi et al.
patent: 4755115 (1988-07-01), Akaike
patent: 5183271 (1993-02-01), Wadu et al.
patent: 5209502 (1993-05-01), Savoia
patent: 5350181 (1994-09-01), Horve

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