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. 14, 2015
Filed:
Apr. 02, 2008
Yusuke Terada, Aikoh-gun, JP;
Shuji Ando, Aikoh-gun, JP;
Yusuke Terada, Aikoh-gun, JP;
Shuji Ando, Aikoh-gun, JP;
NHK Spring Co., Ltd., Yokohama, JP;
Abstract
A clutch apparatus is equipped with two clutch structures having a clutch drum therein. A driven plate and a piston are provided in the clutch drum of each clutch structure, and a primary coned disc spring and a secondary coned disc spring, which are ring-shaped, are provided between the driven plate and the piston. A flat portionis formed on an inner peripheral portion of a convex surface of the primary coned disc spring, and the flat portioncan come into contact with a counter member first when a load is applied. A load in a flat condition due to elastic deformation is adjusted by the flat portion so as to be a desirable value. BlanksA andA of the primary coned disc spring and the secondary coned disc spring can be obtained from one sheet of material having the same thickness. In this case, the flat portionA is formed by press forming on an inner peripheral portion of the blankA in view of the shape thereof after bending forming is performed.