Rotary expansible chamber devices – With changeable working chamber magnitude – Spring or fluid biased movable member
Patent
1983-11-10
1988-09-13
Croyle, Carlton R.
Rotary expansible chamber devices
With changeable working chamber magnitude
Spring or fluid biased movable member
418 27, 418102, F04C 1504
Patent
active
047706163
ABSTRACT:
A variable vane-type pump in which a cam ring with variable eccentricity encompasses a rotary piston comprising vanes guided in radial slots. At least one lateral surface of the rotary piston abuts on the contact surface of a control disc with pressure pocket and suction pocket. A channel is provided in the control disc whose intake opening is disposed in the direction of rotation of the pump between pressure pocket and suction pocket and in direct vicinity of the end of the pressure pocket. The channel terminates in a housing chamber, the waste oil chamber, the lubricating channels and/or into the under-vane chambers. After displacement of the cam ring, a connection can be established between the channel and the pressure pocket so that the pressure fluid still delivered can discharge via the channel to safeguard lubrication of the pump.
REFERENCES:
patent: 2236556 (1941-04-01), Wunderle
patent: 2651994 (1953-09-01), DeLancey et al.
patent: 2724339 (1955-11-01), O'Connor et al.
patent: 2742861 (1956-04-01), O'Connor et al.
patent: 2788671 (1957-04-01), Talbot
patent: 3373692 (1968-03-01), Klessig et al.
patent: 3918855 (1975-11-01), Bornholdt
Croyle Carlton R.
IT&T Industries, Inc.
Olds T.
Raden James B.
Seitter Robert P.
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