Plunger for an internal combustion engine fuel pump
AssigneeCaterpillar Motoren GmbH & Co. KG
InventorsAndreas Von der Osten-Sack, Ole Ohrt
Life of this patent
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Abstract
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.
Claims20
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;
- and
- a 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.
A plunger, comprising:
- a generally 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;
- and
- a 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.
A fuel pump for an internal combustion engine, the fuel pump comprising:
- a pump housing;
- a pump barrel disposed within the pump housing;
- and
- a plunger disposed within the pump barrel, the plunger including:
- a generally 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;
- and
- a 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.
Dependencies are inferred from the claim text.