Sealing assembly for a rotary shaft, in particular of an automot

Details Sealing assembly for a rotary shaft, in particular of an automot Sealing assembly for a rotary shaft, in particular of an automot

1997-12-02

2000-05-02

Knight, Anthony

Seal for a joint or juncture

Seal between relatively movable parts

Circumferential contact seal for other than piston

277402, 277560, 277565, F16J 1532

Patent

active

060562935

ABSTRACT:
A sealing assembly for a pump shaft, having a metal supporting structure, and a sealing ring in turn having a main sealing lip and a secondary lip, which extend axially in opposite directions and define an annular cavity together with a lateral surface of the shaft. When undeformed, the diameters of the two lips are such as to respectively determine a predetermined amount of interference and a radial clearance with the shaft. The sealing ring is so formed as to be deformed elastically by the interference fit between the main lip and the shaft, so as to cause the secondary lip to cooperate with the shaft with substantially no interference. The secondary lip is defined between two annular sides converging with each other to form a sealing edge towards a lateral surface of the shaft; and the side located on the opposite side to the annular cavity is defined by an oblique annular surface defining in radial section an acute angle with the shaft so as to receive, in use, a sufficient radial thrust to raise the secondary lip slightly and allow fluid to leak into the annular cavity.

REFERENCES:
patent: 3005648 (1961-10-01), Christensen
patent: 3396977 (1968-08-01), Iguchi
patent: 3854734 (1974-12-01), West
patent: 4448461 (1984-05-01), Otto
patent: 4799808 (1989-01-01), Otto
patent: 4822055 (1989-04-01), Hogan
patent: 4991982 (1991-02-01), Colanzi et al.
patent: 5201528 (1993-04-01), Upper
patent: 5244215 (1993-09-01), Cather, Jr. et al.
patent: 5582412 (1996-12-01), Sabo Filho
patent: 5588656 (1996-12-01), Matsushima

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