Spring cartridge rotor bearing
US5795075A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 4, 1996 |
| Grant date | Aug 18, 1998 |
| Priority date | — |
| Expiry date | Sep 4, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K7/088
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A spring cartridge rotor bearing is inserted into an electric motor during assembly as a preassembled unit. The rotor bearing includes a sleeve having a bore adapted to receive therethrough a shaft of the electric motor, and each end of the sleeve adapted to contact adjacent motor rotor sections. A bearing has a bore extending therethrough with the sleeve received therein. The bearing thermally locks into the stator bore early in motor warm-up and the bearing has sufficient end play on the sleeve to accommodate shaft expansion. One or more springs are located on the sleeve to bias the bearing to a neutral or generally centered position on the sleeve. The springs permit the bearing to move along the sleeve during times of thermal expansion and contraction, and prevent the bearing from becoming locked into an extreme position. This prevents the transmission of thrust loads from the rotor to the bearing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.