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. 02, 2011
Filed:
Oct. 26, 2007
Kouji Ohbayashi, Toyoake, JP;
Kazuaki Okada, Okozoki, JP;
Taro Matsukawa, Anjo, JP;
Yutaka Eto, Anjo, JP;
Koki Mizuno, Kariya, JP;
Kazumichi Tsukuda, Anjo, JP;
Kouji Ohbayashi, Toyoake, JP;
Kazuaki Okada, Okozoki, JP;
Taro Matsukawa, Anjo, JP;
Yutaka Eto, Anjo, JP;
Koki Mizuno, Kariya, JP;
Kazumichi Tsukuda, Anjo, JP;
Aisin AW Co., Ltd., Anjo-Shi, JP;
Abstract
A method of manufacturing a sheave member for a belt-type continuously variable transmission includes a forming step wherein an intermediate product having a sheave surface is formed by forging a steel material; a carburization step wherein the intermediate product is heated in a carburization gas; a gradual cooling step wherein the cooling speed is equal to or less than 20° C./sec, at least until the temperature of the intermediate product has passed through the transformation point; a high-frequency electrical heating step wherein a selected portion(s) of the intermediate product is heated; a water quenching step wherein the selected portion is quenched by contact with water; and a finishing step wherein a grinding process is applied to the intermediate product to attain the final shape. In the cooling step, preferably, the intermediate product is contacted with a cooling gas at a pressure lower than atmospheric pressure.