Fuel pump having dual profile cam ring for driving low and high pressure reciprocating plungers
US5888054A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 26, 1997 |
| Grant date | Mar 30, 1999 |
| Priority date | — |
| Expiry date | Jun 26, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M59/18
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A novel fuel pump arrangement comprises cam driven low and high pressure reciprocating plunger pump units. The fuel pump has rotary drive means, a high pressure pump with a pump body which defines a pumping chamber with an annular arrangement of a plurality of pairs of bores extending radially outwardly from a cam axis. A pumping plunger is mounted in each pumping plunger bore for reciprocation. The fuel pump also comprises a single transfer pump for transferring fuel under pressure to the pumping chamber. This transfer pump includes a single transfer plunger mounted within a transfer plunger bore for reciprocation to provide alternating intake and transfer phases of operation of the transfer pump. The fuel pump further includes an annular cam ring surrounding the high pressure pump body such that the cam ring is rotatable about the cam axis by the rotary drive to thereby cause reciprocation of the transfer plunger in predetermined synchronization with the high pressure pump whereby fuel is intermittently delivered for transfer to the high pressure pump.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.