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:
Jul. 17, 2001
Filed:
Dec. 23, 1999
Masayoshi Shimizuya, Kanagawa, JP;
Makoto Fujinami, Kanagawa, JP;
Hiroyuki Itoh, Kanagawa, JP;
Seiji Higuchi, Kanagawa, JP;
Nobuo Goto, Kanagawa, JP;
NSK Ltd., Tokyo, JP;
Abstract
In the toroidal-type continuously variable transmission, the radial needle roller bearing includes a plurality of needle rollers, the two end portions of each of the needle rollers in the axial direction thereof are crowned, and the crowning amount is set such that, in the portion of the needle roller that is situated by 7-13% of the axial-direction length toward the axial-direction central portion of the needle roller from the axial-direction end face of the needle roller, the crowning amount is 0.1-0.4% of the outside diameter of the axial-direction central portion of the needle roller. Further, in the inner peripheral surface of the output-side disk, there are formed a fitting portion to be fitted outside with a member rotatable in conjunction with the output-side disk and an outer race raceway portion for the needle roller bearing, in the portion of the inner peripheral surface of the output-side disk that is situated near to the inside surface thereof, there is formed a residual compressive stress layer by shot peening, and the outer race raceway portion is ground so as to remove a portion of the residual compressive stress layer, to thereby form the outer race raceway portion as a smooth surface.