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:
Sep. 04, 2007
Filed:
May. 10, 2004
Kazuhiko Yoshida, Shizuoka, JP;
Takashi Koike, Shizuoka, JP;
Kenichi Iwamoto, Shizuoka, JP;
NTN Corporation, Osaka-shi, Osaka, JP;
Abstract
To provide a torque detecting device having a sufficient mechanical strength, capable of accomplishing an accurate torque measurement, having a processability excellent for mass-production, and effective to eliminate problems associated with damages which would be brought about during a heat treatment. This torque detecting device includes a target area subject to torque detection () provided in a surface region of a torque transmitting shaft () made of a steel material; a detecting coil () provided in a non-contact fashion in face-to-face relation to an outer periphery of the target area subject to torque detection (); and a detection signal processing circuit (). The target area subject to torque detection () is a layer of magnetostrictive material comprised of an Al diffusion layer. This diffusion layer contains Al diffused in a steel material in a concentration which gradually decreases from the surface in a direction radially inwardly of the torque transmitting shaft ().