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.