Fuel pump
US7063502B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 2004 |
| Grant date | Jun 20, 2006 |
| Priority date | — |
| Expiry date | Apr 19, 2024 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D29/188
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fuel pump prevents pressurized fuel from being pulled into a clearance between an outer circumference face of an impeller and an inner circumference face of a pump case, thereby allowing the delivery of the pressurized fuel from a pump body side to a pump cover side through through-holes of the impeller.Since a clearance C2 between an impeller outer circumference face 16p and a pump cover inner circumference face 39c is made extremely small, the pressurized fuel is caused to pass via through-holes 16c that communicate between an upper and an lower side of an impeller 16. By this means, it is difficult for the pressurized fuel to enter the clearance C2, and it is possible to prevent the decrease in pump efficiency caused by pressure at the impeller outer circumference face 16p and the vicinity thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.