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:
Mar. 06, 2001
Filed:
Jan. 21, 1999
Hiroyuki Sawai, Fujisawa, JP;
Takafumi Kuwano, Fujisawa, JP;
Nobuo Gotou, Fujisawa, JP;
Takashi Imanishi, Fujisawa, JP;
Nobuaki Mitamura, Fujisawa, JP;
NSK Ltd., Tokyo, JP;
Abstract
A power roller of a power roller bearing in a half-toroidal type continuously variable transmission is manufactured as follows. In step S,, a work used as material is heated up to a temperature suitable for forging. In step S,, the work is pressed by using a first die set, with its end face being held. In step S,, the work is forged by using a second die set. The work is formed into a work having a curved face corresponding to a traction surface, a hole corresponding to a center hole, and a recess corresponding to a raceway groove. In step S,, the work is punched by using a third die set. In step S,, the work is subjected to a cutting process and a heating process, thereby obtaining the power roller.