公开(公告)号：US10288024B2

公开(公告)日：2019-05-14

申请号：US15118602

申请日：2015-01-13

Applicant: DELPHI TECHNOLOGIES IP LIMITED

Inventor： Ben Marsden ,  Andreas Panayiotou ,  Adam Mercer

IPC: F02M59/44 ,  F04B19/22 ,  F04B39/00 ,  F02M61/16

Abstract: A fuel pump includes a housing provided with an axial bore defining a compression chamber. The pump is further provided with a cylindrical piston slidably arranged in the bore, the piston extending from a top extremity that is inside the bore, defining a high pressure extremity, to a lower extremity, defining a low pressure extremity. The piston is able to reciprocally slide between a lower position where fuel at low pressure enters the compression chamber via an inlet and, a top position where fuel present in the compression chamber is pressurized before being expelled via an outlet. The piston is also provided with a recess surrounded by a peripheral wall arranged on its high pressure extremity, the recess and peripheral wall enabling the piston to expand radially when fuel in the compression chamber is pressurized.