Laminate carbon brush for fuel pump motor
US10270322B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 16, 2015 |
| Grant date | Apr 23, 2019 |
| Priority date | — |
| Expiry date | Jun 28, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01R39/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A laminated carbon brush for a liquid pump motor slides in a liquid fuel on a disk-like commutator. The laminated carbon brush includes two layers of a lower resistivity layer and a higher resistivity layer. In both the lower resistivity layer and the higher resistivity layer, circular directional resistivities of the brush along a circular direction in the rotation of the commutator are higher than non-circular directional resistivities of the brush along a radial direction of the commutator and a perpendicular direction to the sliding surface of the commutator. A non-circular directional resistivity of the higher resistivity layer are higher than or equal to 90,000 μΩ·cm. No spark discharges occur if the fuel pump motor is operated to output a high power.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.