Brush holder structure in electric motor
US5159221A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 1990 |
| Grant date | Oct 27, 1992 |
| Priority date | — |
| Expiry date | Aug 31, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01R43/24
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A brush holder structure in an electric motor in which brush holders for housing brushes held in slidable contact with a commutator provided on a rotor shaft and an end bracket for rotatably supporting the rotor shaft are both integrally molded with a gear frame for housing and supporting a worm gear mechanism. The worm gear mechanism includes a worm formed around the distal end portion of the rotor shaft and a worm wheel held in mesh with the worm. A lead-out groove for leading out a pig tail extended from each brush is formed in a proximal end side wall of each brush holder with respect to the rotor shaft, and a receiver for receiving resilient spring fitted in each brush holder to press each brush against a commutator is disposed between two proxiamal and distal end side walls of each brush holder. The receiver extends in the axial direction of the rotor shaft, and is set to have its width not exceeding the width of the lead-out groove in the circumferential direction of the rotor shaft. The brush holders having the receiver can be simply molded by setting first and second molds in butt relationship against a main mold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.