(19)
(11) EP 1 435 456 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.05.2005 Bulletin 2005/19

(43) Date of publication A2:
07.07.2004 Bulletin 2004/28

(21) Application number: 03257660.5

(22) Date of filing: 05.12.2003
(51) International Patent Classification (IPC)7F04B 1/04, F04B 49/12
(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: 06.12.2002 GB 0228559

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

(72) Inventor:
  • Bootle, Geoffrey D
    Maidstone, Kent ME16 0HJ (GB)

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

   


(54) Hydraulic Pump


(57) A sinusoidal hydraulic pump that is particularly suitable for use as a high pressure pump for a fuel injection system of a compression ignition engine. The pump includes first and second plungers, a filling plunger (110) and a delivery plunger (112), each of which is reciprocable within a respective bore (120, 122) provided in a pump housing (124) under the influence of a respective cam (114, 116) mounted upon a common cam shaft (118). The bores (120, 122) communicate with each other at their uppermost ends (in the orientation shown) and define, together with end surfaces of the filling and delivery plungers (110, 112), a pump chamber (126) for receiving fuel through a pump inlet port (130) provided in a wall of the pump housing (124). The filling plunger (110) cooperates with the inlet port (130) to provide a means for controlling fuel flow into the pump chamber (126) from a low pressure fuel supply. A delivery port (132) is also provided in the pump housing (124) in the region of the bore (122), and the outer surface of the delivery plunger (112) cooperates with the delivery port (132) to provide a means for controlling the delivery of pressurised fuel from the pump chamber (126) to a high pressure fuel volume.







Search report