Variable reluctance electromagnetic sensor with pole piece-magnet assembly locking mechanism and method of assembly
US4829245A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 8, 1987 |
| Grant date | May 9, 1989 |
| Priority date | — |
| Expiry date | Dec 8, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49075
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention is in the field of electromagnetic transducers. The sensor according to the invention includes an electrical winding 2 mounted on a carcass 1 hollowed with a cavity 7 which receives a metal pole piece 5 and a permanent magnet 6. According to the invention inclined ribs 20 are formed in the cavity 7 in order to constitute a means of progressively locking the magnet by the wedge effect during the insertion of this magnet and of the pole piece into the cavity. It is thus possible to accurately adjust the distance d which separates the end 21 of the pole piece from a reference surface 22 of the carcass 1. Application to the production of a shaft speed sensor or a wheel speed sensor for a motor vehicle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.