Floating seal for sealed star gerotor

Details Floating seal for sealed star gerotor Floating seal for sealed star gerotor

1997-05-28

2000-06-06

Vrablik, John J.

Rotary expansible chamber devices

Working member has planetary or planetating movement

Plural working members or chambers

418142, F01C 110, F01C 1908

Patent

active

060711027

ABSTRACT:
A steering control unit having a gerotor gear set (15) including a ring member (35) and a star member (37) which orbits and rotates within the ring. Adjacent the rearward surface (49) of the star (37) is and end cap (17). The invention provides an improved sealed star arrangement, in which the star defines an annular groove (51) in which are disposed a seal ring (55) and a backup ring (57). In accordance with the invention, the inside diameter (61) of the backup ring (57) is less than the diameter of the inner surface (59) of the groove, such that there is a radial squeeze on the backup ring (57). The axial dimension of the seal ring (55) and backup ring (57) together is less than the axial dimension of the groove (51), so there is no axial squeeze on the rings, thus eliminating the binding of the gerotor star which has been common with prior art sealed star arrangements.

REFERENCES:
patent: 3801239 (1974-04-01), Larson
patent: 4116593 (1978-09-01), Jones
patent: 4145167 (1979-03-01), Baatrup
patent: 5080567 (1992-01-01), White, Jr.

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