Magnetic rotation sensor wherein a magnetic member is attached to a rotation shaft by a heat resistant elastic member
US4820978A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 29, 1987 |
| Grant date | Apr 11, 1989 |
| Priority date | — |
| Expiry date | May 29, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T403/48
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A rotation sensor for vehicle includes a drive shaft connected to a rotation shaft of a vehicle by a transmission member, a ring-shaped magnet member provided onto the drive shaft and a detector for detecting change of magnetic flux caused by rotations of the magnetic member, wherein rotation frequency or rotation speed can be measured by detecting the changes of the magnetic flux. The magnetic member is formed of a composition of heat resisting resin and magnetic materials, and the formed magnetic member is fixed to the drive shaft through a heat resistant elastic member. As a result, even if the rotation sensor is located in high temperature place, e.g. around an engine, there is no possibility that a crack in the magnet member will be caused since expansion or contraction in the magnetic member can be absorbed by the elastic member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.