Seal compensated geometry rotary motion device

Rotary expansible chamber devices – Working member has planetary or planetating movement – Plural working members or chambers

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418 61B, 418113, 418129, 291564R, 291565R, F01C 110, F01C 122, B23P 1500, B23P 1510

Patent

active

043952062

ABSTRACT:
Conventional industry practice has been to provide apex seals along adjoining intersecting peripheral surfaces of the envelope members in trochoidal rotary devices. The trochoidal member profiles are then recessed by a seal offset amount and the seals extended from the apices of the envelope member by the seal offset amount to minimize reciprocation of the seals in their grooves. In accordance with the invention, modified epitrochoids and corresponding envelopes are formed so that sealing faces of the apex seals can be substantially continuous with the envelope peripheral surfaces. In this manner, nearly ideal expansion ratios are achievable in such rotary devices and wider sealing faces can be used than heretofore practical.

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patent: 4018548 (1977-04-01), Berkowitz
patent: 4070137 (1978-01-01), Goloff
F. J. Robinson et al., "Machining Trochodial Profiles by Numerical Control", Machining and Production Engineering, Nov. 6, 1974, pp. 506-511.
J. R. Colbourne, "The Geometry of Trochoid Envelopes and Their Application in Rotary Pumps," Mechanism and Machine Theory, 1974, vol. 9, pp. 421-435.

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