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:
Apr. 10, 2001
Filed:
Sep. 15, 1998
Kabushiki Kaisha Toyoda Jidoshokki Seisakusho, Kariya, JP;
Abstract
A scroll-type vacuum pump includes a fixed scroll and a movable scroll. The fixed scroll has a base plate and a volute portion formed on the base plate. The movable scroll includes a base plate having a volute portion. The volute portions cooperate to form a variable displacement fluid pocket between the two scrolls. The movable scroll includes a rear boss projecting from the rear surface of the base plate and a front boss projecting from the front surface of the base plate. The rear boss is located in a working region, which includes the volute portion of the movable scroll. An eccentric shaft is integrally formed on a drive shaft. The eccentric shaft is inserted in rotates relatively to both bosses to support the movable scroll. The eccentric shaft receives a radial force generated in the working region mainly through the rear boss. Accordingly, no inclination moment is applied to the movable scroll and the movable scroll does not incline with respect to the fixed scroll. This improves the performance and efficiency of the pump.