Plunger for an internal combustion engine fuel pump

摘要

A plunger of a fuel pump is disclosed. The plunger may have a cylindrical base configured for axial movement and rotation within a pump barrel. The plunger may also have a fuel amount controlling end. The fuel amount controlling end may have a recessed surface region. The fuel amount controlling end may also have a sealing surface region. Further, the fuel amount controlling end may have a control interface connecting the recessed surface region with the sealing surface section in a radial direction. The transition from the recessed surface region to the control interface may be curved.

主权项

1. A plunger of a fuel pump, comprising:
a cylindrical base configured for axial movement and rotation within a pump barrel; a fuel amount controlling end having an outer surface that comprises:
a zero fuel groove on the outer surface, the zero fuel groove extending from an end face of the plunger along an axial direction of the plunger;a recessed surface region;a sealing surface section; anda control interface connecting the recessed surface region with the sealing surface section in a generally radial direction, the control interface extending helically from the zero fuel groove around a plunger axis,
wherein the transition from the recessed surface region to the control interface is curved with a curvature radius that has a radius equal to or larger than about 1 mm.