Carbon brush for electric fuel pumps
US6091178A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 3, 1999 |
| Grant date | Jul 18, 2000 |
| Priority date | — |
| Expiry date | Feb 3, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01R39/26
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An improvement to an electric fuel pump which includes an electric motor with a rotating commutator defining an axial direction, a radial direction and a tangential direction, and having a circumferential surface, and a carbon brush having a contact surface contacting the circumferential surface of the commutator. The brush includes a gap extending from the contact surface in a radial direction and further extending through the brush in the axial direction, the gap reducing flotation of the carbon brush caused by a layer of fuel drawn between the carbon brush and the commutator. In an alternate embodiment, the brush includes a pressure relief hole extending from the contact surface completely through the brush in the radial direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.