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1. (WO2013113693) PUMP HEAD FOR A FUEL PUMP

Pub. No.:    WO/2013/113693    International Application No.:    PCT/EP2013/051674
Publication Date: Fri Aug 09 01:59:59 CEST 2013 International Filing Date: Wed Jan 30 00:59:59 CET 2013
IPC: F02M 59/10
F02M 59/44
F04B 1/04
Applicants: DELPHI INTERNATIONAL OPERATIONS LUXEMBOURG S.À.R.L.
Inventors: MCCRINDLE, Christopher
Title: PUMP HEAD FOR A FUEL PUMP
Abstract:
A pump head (14) for a high-pressure fuel pump is disclosed. The pump head comprises a head housing including a body portion (24), and a turret portion (30) extending from the body portion (24), a pumping chamber (36) defined within the body portion (24), a pumping element bore (34) for receiving a pumping element (32) in use, the pumping element bore (34) extending from the pumping chamber (36) and through the turret portion (30), and a leakage return passage (74). The pump head (14) further comprises a sleeve (70) arranged around the turret portion (70) to define a leakage flow path (72) to allow fuel flow from the pumping element bore (34) to the leakage return passage (74). The pump head is suitable for use in a fuel pump of the type in which a cam drive arrangement of the pump is lubricated by engine oil, since contamination of the engine oil with fuel can be minimised. Therefore the through-passage (80) communicates with a collection groove (82) provided in the pumping element bore (34) in the turret portion (30), or in the pumping element (32).