Rotary fluid pressure device and thrust absorbing arrangement th

Details Rotary fluid pressure device and thrust absorbing arrangement th Rotary fluid pressure device and thrust absorbing arrangement th

1976-02-17

1977-05-03

Vrablik, John J.

Rotary expansible chamber devices

Working member has planetary or planetating movement

Plural working members or chambers

64 9R, 403121, F01C 102, F16D 318, F16C 3200, F01C 2100

Patent

active

040211614

ABSTRACT:
A rotary fluid pressure device of the type including a gerotor gear set having an externally-toothed rotor orbiting and rotating within an internally-toothed stator. An intermediate shaft has one end in splined engagement with the rotor and the other end defining a large set of internal splines. The device includes an output shaft assembly, also defining a large set of internal splines, with a large dogbone shaft transmitting torque between the intermediate shaft and the output shaft assembly. A portion of the housing disposed between the gerotor gear set and the end of the intermediate shaft defining the internal splines is engaged by the enlarged portion of the intermediate shaft, resulting in large and random axial forces being exerted by the intermediate shaft. To absorb such thrust forces, a wear ring is seated within a recess formed in the housing portion and includes an annular wear surface defining an axis substantially coincidental with the axis of the internally-toothed stator. During operation, with the intermediate shaft orbiting and rotating, the wear surface is engaged by a stop surface on the intermediate shaft. With the wear surface having an average diameter equal to N (the number of internal teeth on the stator) multiplied by 2E (where E is the eccentricity of the gerotor), rubbing action and the resulting wear occurring conventionally between the stop surface and the wear surface is eliminated and the engagement occurring therebetween is substantially pure rolling motion.

REFERENCES:
patent: 3657903 (1972-04-01), Woodling
patent: 3782866 (1974-01-01), McDermott

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