公开(公告)号：WO2022223742A1

公开(公告)日：2022-10-27

申请号：PCT/EP2022/060635

申请日：2022-04-21

Applicant: DELPHI TECHNOLOGIES IP LIMITED ,  BORGWARNER FRANCE SAS

Inventor： JONES, David

IPC: F02M59/10 ,  F04B1/0439 ,  F04B9/04

Abstract: A roller tappet assembly (19, 21) for a fuel pump assembly (10) of an internal combustion engine, the roller tappet assembly (19, 21) comprising a tappet body (23, 25) with a tappet body cavity (60), an annular roller assembly, and a pin (24). The annular roller assembly is arranged inside the tappet body cavity (60) for rolling contact with a cam surface (20. 21) of a camshaft (18) of the fuel pump assembly (10). The pin (24) extends through the roller assembly and is axially and radially constrained relative to the tappet body (23, 25). The axial constraint of the pin (24) is realised by means of at least two circlips (61), arranged at respective ends of the roller assembly.

公开(公告)号：WO2022101301A1

公开(公告)日：2022-05-19

申请号：PCT/EP2021/081302

申请日：2021-11-10

Applicant: DELPHI TECHNOLOGIES IP LIMITED ,  BORGWARNER FRANCE SAS

Inventor： JONES, David

IPC: F02M55/04 ,  F02M59/44 ,  F02M59/10

Abstract: A fuel pump assembly (110) for an internal combustion engine comprises a plunger (114) arranged to reciprocate within a plunger bore (132) under the influence of a drive arrangement (123) driven by means of a drive shaft (18), to perform a pumping cycle comprising a pumping stroke and a return stroke, the pumping stroke comprising movement of the plunger (114) from a bottom dead centre (BDC) position to a top dead centre (TDC) position to pressurise fuel within a pump chamber (36), and the return stroke comprising movement of the plunger (114) from the TDC position to the BDC position. The fuel pump assembly comprises a spring assembly including a return spring (154) configured to apply a return force to the plunger (114) to effect the return stroke, wherein the return spring (154) is cooperable, at a first end (62), with a first member (150) coupled to the plunger (114) and movable at a first speed dependent on the speed of rotation of the drive shaft (18) and, at a second end (64), with a second member (70) which is movable at a damped speed relative to the first speed so that the return spring has a variable stroke length depending on the speed of rotation of the drive shaft (18).