Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1979-05-02
1980-03-25
Ward, Jr.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 83, 277134, 277173, 277236, F16J 1534, F16J 1540
Patent
active
041947452
ABSTRACT:
A controlled clearance seal is disclosed for use on a shaft rotatably supported in a housing to seal high pressure hydraulic fluid in a housing having a sealing face adjacent the shaft which is symmetrical with respect to the center line of the shaft. The seal includes a generally annular body formed of a material having a coefficient of expansion slightly greater than the coefficient of expansion of the shaft. The entire body surface is impregnated with Teflon compounds providing permanent lubricity and high hardness. The body has a sealing face engageable with the sealing face on the housing and has a flange portion projecting axially away from the sealing face on the body. The flange portion has an inner circumferential surface engageable with the shaft and the inner surface has an inside diameter slightly larger than the diameter of the shaft thereby permitting the seal body to rotate with the shaft until high pressure hydraulic fluid presses the sealing face on the body against the sealing face on the housing to frictionally retain the sealing body in a fixed position relative to the housing and causes the flange to be compressed radially against the shaft. This momentary rubbing creates friction and heat which expands the body relieving the friction and increasing the clearance. A balance is instantly established between constricting pressure, friction, heat and expansion resulting in a nearly constant clearance with almost no leakage.
REFERENCES:
patent: 2879085 (1959-03-01), Andersen
patent: 3001806 (1961-09-01), Macks
patent: 3093382 (1963-06-01), Macks
patent: 3367682 (1968-02-01), Meriano
patent: 3438638 (1969-04-01), Newcomb et al.
patent: 4161317 (1979-07-01), Sakamaki
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