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:
May. 14, 2002
Filed:
Mar. 15, 2001
Tsuyoshi Nachi, Mie, JP;
Teijin Seiki Co., Ltd., Tokyo, JP;
Abstract
In screw rotors ( ) which are each provided with a screw tooth ( ) having a spiral addendum surface portion ( ) and a deddendum surface portion ( ), and are used as a pair of male and female, between the addendum surface portion ( ) and deddendum surface portion ( ) of the screw tooth ( ), there is provided the pitch circumference portion ( ) which forms a predetermined angle range of circular arc having a definite radius rp on an optional transverse cross section, and the radius of the pitch circumference portion ( ) is set such that, when the opposing rotors are meshed with each other, out of the meshing clearances between the male and female screw teeth ( ), the clearance g between the pitch circumference portions ( ) becomes smaller than the clearances g g g between the other portions.