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. 21, 1993
Filed:
Sep. 09, 1992
Toshiro Kawakami, Obu, JP;
Aisin Seiki Kabushiki Kaisha, Kariya, JP;
Abstract
A centrifugal supercharger is provided with a supporting system for supporting a shaft. The supporting system includes at least one outer bearing and at least one inner bearing. The outer bearing is fitted in the housing so as to form a small clearance between its outer circumferential surface and the housing. The inner bearing is fitted in the outer bearing so as to form a small clearance between its outer circumferential surface and the inner circumferential surface of the outer bearing. In the inner bearing, the shaft is inserted so as to form a small clearance between its outer circumferential surface and the inner circumferential surface of the inner bearing. At least one outer oil supply hole and at least one inner oil supply hole are formed in the outer and inner bearings, respectively and oil is supplied from the oil supply passage to each small clearance through the oil supply holes. Thereby, an oil film is formed in each small clearance, respectively and therefore a triple oil film is formed between the shaft and the housing. Accordingly, the radial vibration of the shaft are sufficiently damped by a squeeze film effect of the triple oil film and the amount of the radial vibration which is transmitted to the housing is decreased. Thereby, the noise of the centrifugal supercharger is decreased.