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:
Nov. 05, 1991
Filed:
Apr. 17, 1990
Kabushiki Kaisha Toyoda Jidoshokki Seisakusho, Kariya, JP;
Abstract
A torque detecting apparatus comprises an annular bobbinless sensor coil disposed on a rotatable shaft, and a position adjustable, non-ferromagnetic metal core member disposed adjacent the sensor coil. When the shaft is twisted, the core member moves in a hollow space defined by the sensor coil to thereby change inductance thereof in accordance with angular displacement between the sensor coil and the core member. A detecting part is disposed in opposition to a solenoid coil wound on the shaft with a gap therebetween for detecting the angular displacement in terms of a change in an oscillation frequency. A sensor set is constituted by the sensor coil and the metal core. A pair of sensor sets may be disposed, wherein one sensor set is so connected that inductance of the associated sensor coil is decreased while the other sensor set is so connected that inductance of the associated sensor coil is increased. Difference or ratio between the two oscillation frequencies may be inputted to a resonance circuit.