Meshing helical rotors

Details Meshing helical rotors Meshing helical rotors

2007-01-16

2007-01-16

Trieu, Theresa (Department: 3748)

Rotary expansible chamber devices

Interengaging rotating members

Helical or herringbone

C418S201100

Reexamination Certificate

active

10737408

ABSTRACT:
A conjugate pair of intermeshing rotors include helical lobes having helical crests and intervening grooves and are adapted for rotation about parallel axes within a working space of a screw rotor machine. Each rotor has a tip circle, a pitch circle, and a root circle. One rotor of each pair is a female rotor formed such that a major portion of each lobe of the female rotor is located inside the pitch circle of the female rotor. The other rotor is a male rotor formed such that a major portion of each lobe of the male rotor is located outside the pitch circle of the male rotor. The lobes of one rotor follow the grooves of the other rotor to form a continuous sealing line between the pair of rotors. Each of the lobes have a primary flank portion and a secondary flank portion. The primary flank portion of the lobes of the female rotor have a profile formed from at least one ellipse, and the primary flank portion of the lobes of the male rotor have a profile formed from at least one ellipse.

REFERENCES:
patent: 3245612 (1966-04-01), Nilsson et al.
patent: 4401420 (1983-08-01), Kasuya et al.
patent: 4412796 (1983-11-01), Bowman
patent: 4890992 (1990-01-01), Lee
patent: 308055 (1989-03-01), None
patent: 1019970122515 (1997-09-01), None

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