(19)
(11) EP 1 363 016 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
09.02.2005 Bulletin 2005/06

(43) Date of publication A2:
19.11.2003 Bulletin 2003/47

(21) Application number: 03252438.1

(22) Date of filing: 16.04.2003
(51) International Patent Classification (IPC)7: F02M 59/10, F02M 59/44, F02M 59/46, F02M 59/38
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
Designated Extension States:
AL LT LV MK

(30) Priority: 22.04.2002 GB 0209146

(71) Applicant: Delphi Technologies, Inc.
Troy, MI 48007 (US)

(72) Inventor:
  • Wood, C.
    Rainham, Kent ME8 9BY (GB)

(74) Representative: Keltie, David Arthur et al
David Keltie Associates, Fleet Place House, 2 Fleet Place
London EC4M 7ET
London EC4M 7ET (GB)

   


(54) Fuel pump


(57) A fuel pump for use in a common rail fuel system for an internal combustion engine comprises a plurality of pump assemblies (12), each of which has a pumping plunger (14) which is reciprocable within a respective plunger bore under the influence of an associated drive arrangement (20, 22, 24) to perform a pumping cycle during which fuel within a respective pumping chamber (18) is pressurised to a relatively high level. The drive arrangement for each pump assembly is arranged to impart reciprocating movement to the associated pumping plunger (14) upon co-operation with a cam surface. At least one of the pumping plunger (14) and the plunger bore is provided with a collection groove (50) which is registerable with a return passage (52) during at least a period of the pumping cycle, the return passage (52) being provided with a venturi device (54) in communication with a low pressure drain (58) such that, in use, leakage fuel within the collection groove (50) is permitted to flow to the low pressure drain through the venturi device (54).






Search report