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US 12,571,364 B2Granted
Sliding cam follower
AssigneeCummins-Scania HPCR System, LLC
InventorsSamuel David Griffith Magnuson, Donald J. Benson, Matthew B. State, Eric A. Benham, Aleksandr E. Lesin, Karthik Sethuraman
Life of this patent
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Abstract
The present disclosure provides a high-pressure fuel pump including a barrel unit, a plunger, and a camshaft assembly having an eccentric cam lobe including a surface of the lobe. A follower is provided between the plunger and the surface of the lobe of the camshaft assembly to facilitate translation between the rotational movement of the camshaft assembly to axial movement of the plunger. The follower includes arcuate surfaces configured to mate with corresponding arcuate surfaces of the lobe of the cam shaft assembly and the plunger, respectively.
Claims21
A fuel pump, comprising:
- a camshaft assembly including an offset lobe having a lobe surface, the lobe surface defining a first arcuate surface and the camshaft assembly configured to rotate about a first axis;
- a barrel unit disposed on the fuel pump, the barrel unit having a second axis substantially perpendicular to the first axis;
- a plunger disposed within the barrel unit for movement along the second axis, the plunger including a foot having a second arcuate surface;
- and
- a follower disposed between the foot of the plunger and the lobe surface, the follower having a third arcuate surface in contact with the second arcuate surface and a fourth arcuate surface in contact with the first arcuate surface, wherein the third arcuate surface of the follower and the second arcuate surface of the plunger define a first contact interface between the follower and the plunger during movement of the follower, and the fourth arcuate surface of the follower and the first arcuate surface of the lobe surface define a second contact interface between the follower and the offset lobe during movement of the follower, and the first and second contact interfaces are each ring shaped around the second axis along which the plunger moves within the barrel unit,
- wherein the fourth arcuate surface of the follower is in sliding contact to mate with the first arcuate surface of the lobe surface and the third arcuate surface of the follower is in sliding contact to mate with the second arcuate surface of the plunger and are configured so that a radial load resulting from the mating arcuate surfaces keeps the follower constrained in place to prevent rolling and translate rotational movement of the camshaft assembly into movement of the plunger along the second axis.
3 more elements
A barrel unit for a fuel pump, comprising:
- a plunger disposed within the barrel unit for movement along an axis, the plunger including a foot having a first arcuate surface;
- and
- a follower having a second arcuate surface in contact with the first arcuate surface, the follower further including a third arcuate surface configured to contact a fourth arcuate surface of a cam lobe of a camshaft assembly, wherein the second arcuate surface of the follower and the first arcuate surface of the plunger define a first contact interface between the follower and the plunger during movement of the follower, and the third arcuate surface of the follower and the fourth arcuate surface of the cam lobe define a second contact interface between the follower and the cam lobe during movement of the follower, and the first and second contact interfaces are each ring shaped around the axis along which the plunger moves,
- wherein the second arcuate surface of the follower is in slidable contact to mate with the first arcuate surface of the plunger and the third arcuate surface of the follower is in slidable contact to mate with the fourth arcuate surface of the cam lobe and are configured so that a radial load resulting from the mating arcuate surfaces keeps the follower constrained in place to prevent rolling and translate rotational movement of the camshaft assembly into movement of the plunger along the axis.
1 more element
A fuel pump, comprising:
- a camshaft assembly including an offset lobe having a lobe surface, the camshaft assembly configured to rotate about a first axis;
- a barrel unit disposed on the fuel pump and including a plunger disposed within the barrel unit, the plunger configured to axially move within the barrel unit along a second axis;
- and
- a follower disposed between the plunger and the lobe surface in slidable contact with the plunger and the lobe surface, the follower including a first arcuate surface and a second arcuate surface and configured to mate to have a sliding relationship at each of the second arcuate surface and the plunger and the first arcuate surface and the lobe surface so that a radial load resulting from the mating surfaces keeps the follower constrained in place to prevent rolling and facilitate translation of rotational movement of the camshaft assembly to axial movement of the plunger, wherein the plunger includes a third arcuate surface in contact with the second arcuate surface of the follower to define a first contact interface between the follower and the plunger during movement of the follower, and the lobe surface defines a fourth arcuate surface in contact with the first arcuate surface of the follower to define a second contact interface between the follower and the offset lobe during movement of the follower, and each of the first and second contact interfaces forms a ring shape around the second axis along which the plunger moves within the barrel unit.
1 more element
Dependencies are inferred from the claim text.