Supply pump for gasoline common rail
US6345609B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 29, 1999 |
| Grant date | Feb 12, 2002 |
| Priority date | — |
| Expiry date | Jun 29, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M63/0225
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The pumping plungers are actuated radially outwardly and withdraw inwardly by an eccentric rotated by the pump drive shaft and associated captured sliding shoes. Because the shoes are forced to follow the eccentric over the full 360° of rotation, the shoes themselves can play an integral role for implementing the function of an inlet check valve which controls flow through a charging passage in each plunger in a radial outward direction, to a respective plunger pumping chamber. Relatively low pressure fuel in the pump cavity surrounding the drive member, is drawn through openings in the radially inner end of the plunger, through an inlet passageway in the plunger, and into the pumping chamber. The path which low pressure fuel follows from the cavity into the inlet passageway of the plunger, can be implemented in a variety of ways, including direct flow from a radially inner side wall of the plunger into the central inlet passageway; flow through a slot in the drive member which registers with a hole in each shoe and which in turn is in fluid communication with the inlet passageway in the plunger; or the retention of the shoes against the drive member can permit slight separatio…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.