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:
Aug. 27, 2002
Filed:
Sep. 22, 2000
NSK, Ltd., Tokyo, JP;
Abstract
In the toroidal-type continuously variable transmission, the radial clearance of a second radial needle roller bearing for supporting the power roller on the periphery of the pivot shaft portion of the displacement shaft is set larger than the radial clearance of a first radial needle roller bearing for supporting a support shaft portion on a trunnion . By increasing the radial clearance of the second radial needle roller bearing in this manner, an increase in the surface pressures in the contact portions between the rolling surfaces of needle rollers and the inner peripheral surface of the power roller and the outer peripheral surface of the pivot shaft portion can be restricted, thereby enhancing the durability of the toroidal-type continuously variable transmission. Also, by reducing the radial clearance of the first radial needle roller bearing , the inclination of the displacement shaft is minimized, thereby stabilizing the rotation speed change operation thereof.