Rotary expansible chamber devices – Interengaging rotating members – Like rotary members
Reexamination Certificate
2008-03-14
2010-12-07
Trieu, Theresa (Department: 3748)
Rotary expansible chamber devices
Interengaging rotating members
Like rotary members
C418S104000, C418S109000, C418S140000, C418S143000, C418S206100
Reexamination Certificate
active
07845921
ABSTRACT:
The invention is to reduce flutter and wear and improve the serviceability and wear life of tip seals for roots blower and screw type compressor superchargers where used for improved supercharger output and efficiency. As the seals travel over the outlet opening, the seals move outward in their slots, leading to flutter which may shorten their useful lives. As each seal reaches the center of the outlet opening, it is forced back into its groove by engaging a valley of the mating rotor with the likelihood of increased wear. The invention provides longitudinally spaced support bars extending laterally across the opening in the directions of rotation of the rotors. The support bars have inner surfaces machined with the associated rotor cavity bores and thus smoothly support the seals as they ride over the support surfaces. The support reduces the flexing of the seals and the resultant wear. Each seal contacts a support bar only during inward motion to the center of the opening where the machined bores intersect and the seal is moving into a valley of the associated rotor of the pair. To reduce edge effect wear of the seals, the width of the support bars may be made narrower from the outer edges of the outlet opening to the center, where each seal loses contact with its respective support bar.
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GM Global Technology Operations Inc.
Trieu Theresa
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