Rotary shaft seal

Details Rotary shaft seal Rotary shaft seal

1977-11-21

1981-08-11

Smith, Robert I.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277134, 277152, F16J 1532

Patent

active

042830648

ABSTRACT:
A hydrodynamic shaft seal is provided having a single annular shaft engaging washer clamped within a metal case. The washer, prior to assembly on the shaft, has an inner wall which is perpendicular to the flat walls thereof but spaced from the longitudinal axis of the washer by a distance which increases and decreases in a cyclic radially undulating fashion. Thus, the inner diameter of the unstressed annular member is scalloped and includes from one to approximately sixteen periodic scallops, the number of such scallops preferably increasing as the diameter of the seal increases. Such a seal is particularly easy to make and the varying angle of contact of the seal with the shaft occasioned by the scallops provides excellent hydrodynamic pumping as is desirable in such seals.

REFERENCES:
patent: 3426819 (1976-02-01), Smith
patent: 3549445 (1964-10-01), McMahon
patent: 3574351 (1971-04-01), Stoltman
patent: 3801114 (1974-04-01), Bentley
patent: 3962776 (1976-06-01), Mikami

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