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. 11, 1994
Filed:
Feb. 24, 1994
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A non-contact detecting type torque sensor having an enlarged measurable torque range is disclosed, in which a tubular torque transmission member having a mounting portion formed on its inner peripheral surface is fixedly mounted on a shaft, a tubular joining member fitted over the torque transmission member is welded at its opposite ends, a surface magnetic layer having a magnetostrictive properties is formed on an outer peripheral surface of the joining member, and coils are disposed around the surface magnetic layer. With this construction, the magnetic permeability of the surface magnetic layer varies with a torque transmitted from the shaft. A change in magnetic permeability is detected in terms of a change in self-inductance of the coils. The welded ends of the joining member are disposed outside the mounting portion of the torque transmitting member in a longitudinal direction of the shaft, so that the measurable torque range of the torque sensor can be enlarged.