Rotary expansible chamber devices – With mechanical sealing
Patent
1987-03-27
1989-03-21
Freeh, William L.
Rotary expansible chamber devices
With mechanical sealing
418206, F04C 1818
Patent
active
048138576
ABSTRACT:
In a Roots blower having a casing, two rotors rotatably housed within the casing, and at least two grease-enclosing bearing units to rotatably support the rotors, characterized in that a bypass groove is formed for each of the bearing unit so as to communicate between a first chamber defined by the casing and the rotors on the side of one axial end of the bearing unit and a second chamber formed by the casing and the bearing unit on the other axial side of the bearing unit, and in that a pair of pressure loaded seal rings (or lip seals) is disposed on axially opposite sides of the bearing unit in such a way that one periphery of each seat ring is secured to a stationary portion of the bearing unit and the other periphery thereof is free to move selectively into or out of contact with a movable portion of the bearing unit according to the presence or absence of a pressure difference produced by a delay in a pressure-balancing action of the bypass groove between the two chambers so that the seal ring prevents bearing grease from leaking. The seal ring is of a U- or L-shape.
REFERENCES:
patent: 2275325 (1942-03-01), Searles
patent: 2779532 (1957-01-01), Herschmann
patent: 2917328 (1959-12-01), Peterson
patent: 3113814 (1963-12-01), Ogura
patent: 3642335 (1972-02-01), Takahashi
patent: 3709572 (1973-01-01), Pethis
patent: 4465442 (1984-08-01), Lang
patent: 4557612 (1985-12-01), Neal
patent: 4594992 (1986-06-01), Naramura
patent: 4655617 (1987-04-01), Yasui
patent: 4657495 (1987-04-01), Sakamaki
patent: 4709682 (1987-12-01), Kato
Aisin Seiki Kabushiki Kaisha
Freeh William L.
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