| 摘要 |
An arrangement adapted to provide a reciprocating drive to a plunger 2 of a fuel pump comprising: a drive shaft (3, fig 1) having an eccentric 4 located thereon, and a rider 5 located on the eccentric. The rider has a surface 6, which may be flat. The plunger is connected to the surface via a mechanical joint and arranged such that rotation of the drive shaft causes movement of said surface including a component comprising reciprocating movement in a first axis, causing corresponding reciprocation of the plunger; the joint allows relative movement between the surface and plunger in a direction perpendicular to said first axis. The mechanical joint can be a dovetail arrangement. The plunger may be fitted to a tappet, which forms the joint with the surface. The mechanical connection removes the need for a spring. |
