Rotary expansible chamber devices – Interengaging rotating members – Helical or herringbone
Reexamination Certificate
2006-09-11
2009-10-20
Denion, Thomas (Department: 3748)
Rotary expansible chamber devices
Interengaging rotating members
Helical or herringbone
C418S157000, C418S159000, C123S559100
Reexamination Certificate
active
07604467
ABSTRACT:
A positive displacement supercharger includes a housing defining a rotor cavity with a pair of positive displacement rotors operative to carry air axially from an inlet end to an outlet in the cavity wall near an outlet end of the cavity. The outlet communicates with an outlet plenum partially defined by the cavity wall. The cavity wall includes a stiff portion defining a plurality of lightening recesses, such as a waffle pattern, limiting distortion of the wall by pulsations in the plenum. The recesses may be time and cost efficiently converted to Helmholtz tuners by covering the recesses with a cover plate, which may be perforated to include at least one tuning opening (perforation) into each tuning chamber (recess) and forming tuning volumes of the tuning chambers and their associated tuning openings effective to attenuate selected frequencies of pulsations in the plenum and thereby reduce undesired noise emanating from the air system of the supercharger.
REFERENCES:
patent: 6589034 (2003-07-01), Vorwerk et al.
patent: 3531353 (1987-03-01), None
Denion Thomas
Duff Douglas J.
GM Global Technology Operations Inc.
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