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. 04, 1998
Filed:
Apr. 17, 1996
Michio Maruki, Kariya, JP;
Takao Taniguchi, Okazaki, JP;
Masataka Shimazaki, Gifu, JP;
Fumitomo Yokoyama, Aichi-ken, JP;
Hideji Kato, Okazaki, JP;
Kouji Ohbayashi, Nagiya, JP;
Yoshimi Watanabe, Okazaki, JP;
Naohisa Momiyama, Hekinan, JP;
Masayoshi Imakire, Okazaki, JP;
Aisin AW Co., Ltd., , JP;
Abstract
A lockup clutch for torque converter which prevents engaging and disengaging shock when a transmission torque suddenly changes, includes a lockup clutch assembly, a lockup clutch piston operating the lockup clutch assembly, and a damper device disposed between the lockup clutch piston and an output member for absorbing changes of transmission torque occurring in association with the operation of the lockup clutch assembly. The lockup clutch piston is made of steel and has a thermally treated portion placed at a surface in contact with springs of the damper device wherein the thermally treated portion is hardened by rapid local melting with high density energy radiation such as electron beam followed by rapid cooling.