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. 05, 2009
Filed:
Apr. 13, 2007
Joji Ito, Fukuroi, JP;
Joji Ito, Fukuroi, JP;
NSK - Warner K.K., Tokyo, JP;
Abstract
A multiplate friction clutch can transmit power by pressing a stack of friction plates, which comprises plural separator plates and plural friction plates arranged alternately side by side, with a piston movable within a clutch casing. The multiplate friction clutch includes an annular holding groove formed in a pressing wall of the piston, a cushioning wave spring received in the holding groove, and an annular protuberance formed on an outer circumferential edge of an opening of the holding groove. The cushioning wave spring can be brought into resilient contact with one of the friction plates, which one friction plate is located adjacent to the piston. The annular protuberance prevents the wave spring from falling off the holding groove.