Electromagnets for brakes and clutches
US4216849A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 12, 1978 |
| Grant date | Aug 12, 1980 |
| Priority date | — |
| Expiry date | Jun 12, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D2127/12
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An electromagnet for brakes and clutches having outer and inner poles and an electrical coil for creating a magnetic field between these poles is provided having a circumferential gap in the forward portion of the outer pole. The gap reduces the flux density over the forward portion of the magnet face while increasing the flux density over the rearward portion. The variable flux density over the magnet face thus establishes an unbalance of forces attracting the magnet toward the armature plate causing the magnet to engage the armature plate heel first thereby eliminating "squeal" caused by magnet gouging and two plane wear of the magnet's friction face.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.