Rotation detecting device with magnet brake
US5543672A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 1990 |
| Grant date | Aug 6, 1996 |
| Priority date | — |
| Expiry date | Oct 11, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P1/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A rotation detecting device for vehicle speedometers includes a housing, a magnetic induction device, and a magnetized rotor near the magnetic induction device. The rotor is connected through a coupling to a rotation source. A braking device forms a magnetic circuit between one end surface of the rotor and the housing, and brings the rotor into pressure contact with the housing by a magnetic attraction force generated in the magnetic circuit. Accordingly, a stable and proper braking torque can be applied against rotor vibration, to prevent a false output signal while idling. Furthermore, the amount of wear of a bearing for rotatably supporting a rotating shaft of the rotor can be reduced to improve durability of the rotation detecting device by reducing the braking torque during high-speed rotation of the rotor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.