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:
Oct. 17, 1989
Filed:
Jun. 22, 1988
Hiroshi Kimura, Katsuta, JP;
Shotaro Naito, Katsuta, JP;
Kunio Miyashita, Hitachi, JP;
Yasuo Noto, Katsuta, JP;
Noboru Sugiura, Mito, JP;
Tadashi Takahashi, Hitachi, JP;
Hirohisa Yamamura, Hitachiota, JP;
Seizi Yamashita, Katsuta, JP;
Syooichi Kawamata, Hitachi, JP;
Fumio Tajima, Ibaraki, JP;
Shigeru Horikoshi, Mito, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A device for detecting a load torque using angle detectors fitted with a certain spacing on a shaft which is rotated by a drive source and on the basis of a relative angular difference of angles detected by the angle detectors. The device includes two rotary drums or discs fitted with a certain spacing on the drive side and load side of the shaft, with a plurality of magnetic poles for generating magnetic signals being formed on the surface thereof, and a magnetic sensor disposed to confront the surface of the rotary drums or discs, with magnetic resistance effect elements which vary in internal resistance in response to the magnetism of the magnetic poles being provided thereon. The amount of torsion created by the load on the load side of the rotary shaft is measured as a phase difference of outputs of the magnetic sensor, and the torque is detected in terms of the angular difference between the magnetic drums or discs. The device is operative to detect a torque in both storage and rotation, and capable of detection within a period of magnetic signal, whereby high-accuracy, high-resolution torque detection is made possible.