Seal life in rotary mechanisms

Details Seal life in rotary mechanisms Seal life in rotary mechanisms

1978-03-13

1980-01-01

Smith, Leonard E.

Rotary expansible chamber devices

Nutating working member

With mechanical sealing

418113, F04C 2700

Patent

active

041814789

ABSTRACT:
A rotary mechanism having improved seal life including a housing defining an operating chamber having a wall configuration based on a desired geometrical shape which is an n order harmonic curve where n is an integer of 1 or more, a shaft journalled in the housing and having an eccentric within the chamber, and a rotor within the chamber and journalled on the eccentric and having a working surface based on the desired geometric shape and which is an n+1 order harmonic curve to define n+1 equally angularly spaced apexes or noses on the surface. n+1 seals are carried by the rotor, one at each apex or nose and timing gearing interconnects the rotor and the housing to establish relative rates of rotation between the housing, the shaft and the rotor. The chamber wall further is defined by an n+1 harmonic curve superimposed on the n order harmonic curve which minimizes relative movement between the seal and the rotor to improve the life of the seals.

REFERENCES:
patent: 3270720 (1966-09-01), Ehrhardt
patent: 3990817 (1976-11-01), Ruf et al.

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