The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 02, 1986
Filed:
Sep. 20, 1984
Loren H Uthoff, Jr, Canton, MI (US);
Eaton Corporation, Cleveland, OH (US);
Abstract
An improved supercharger or blower (10) of the Roots-type with reduced airborne noise and improved efficiency. The blower includes a housing (12) defining generally cylindrical chambers (32, 34) containing meshed lobed rotors (14, 16) having the lobes (14a, 14b, 14c, 16a, 16b, 16c) thereon formed with an end-to-end helical twist according to the relation 360.degree./2n, where n equals the number of lobes per rotor. In one embodiment, blower housing (12) also defines inlet and outlet ports (36, 38). The inlet port includes longitudinal boundaries defined by housing wall surfaces (20f, 20h) and transverse boundaries defined by housing wall surfaces (20g, 20i). The transverse boundaries (20g, 20i) are disposed substantially parallel to the helical lobes. The outlet port includes longitudinal boundaries defined by housing surfaces (20m, 20r) and a transverse boundaries defined by housing surfaces (20p, 20s). The inlet and outlet port openings are skewed in opposite directions to increase the time top lands of the lobes are in sealing relation with cylindrical walls (20a, 20b) of chambers (32, 34). Expanding orifices (42, 44) defined by the intersection of transverse boundaries (20p, 20s) and longitudinal boundary (20m) are disposed substantially midway between ends (14g, 14h and 16g, 16h) of the lobe lands to reduce backflow noise.