Optimized helix angle rotors for Roots-style supercharger

Details Optimized helix angle rotors for Roots-style supercharger Optimized helix angle rotors for Roots-style supercharger

2005-05-23

2009-02-10

Denion, Thomas (Department: 3748)

Rotary expansible chamber devices

Interengaging rotating members

Three or more

C418S197000

Reexamination Certificate

active

07488164

ABSTRACT:
A method of designing rotors for a Roots blower comprising a housing having cylindrical chambers, the housing defining an outlet port (19). The blower includes meshed, lobed rotors (37,39) disposed in the chambers, each rotor including a plurality N of lobes (47,49), each lobe having first (47a,49a) and second (47b,49b) axially facing end surfaces. Each lobe has its axially facing surfaces defining a twist angle (TA), and each lobe defines a helix angle (HA). The method of designing the rotor comprises determining a maximum ideal twist angle (TAM) for the lobe as a function of the number N of lobes on the rotor, and then determining a helix angle (HA) for each lobe as a function of the maximum ideal twist angle (TAM) and an axial length (L) between the end surfaces of the lobe. A rotor designed in accordance with this method is also provided.

REFERENCES:
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European Search Reoprt dated Sep. 21, 2006 for European Patent Application No. 06010507.9-1267.

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