Torque detecting apparatus
US4874053A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 22, 1988 |
| Grant date | Oct 17, 1989 |
| Priority date | — |
| Expiry date | Jun 22, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60G2204/11
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.