System and method for camshaft vibration control

A system comprising:

• a camshaft disposed along an axis from a drive end to an opposite end, wherein the camshaft comprises a first section coupled to a second section, the first section is nearer the drive end, and the second section is nearer the opposite end, wherein the first section comprises:
• a first plurality of journals configured to support the camshaft, wherein each journal of the plurality of journals is spaced along the axis;
• a first plurality of cams spaced along the axis, wherein the plurality of cams is disposed along the camshaft in sets, wherein each set is disposed between a respective pair of journals of the plurality of journals;
• and
• a first plurality of mass portions, wherein each mass portion of the plurality of mass portions is disposed between a set of cams of the plurality of cams and a respective journal of the plurality of journals;
• and
• wherein the second section comprises:
• a plurality of journal configured to support the camshaft, wherein each journal of the plurality of journals is spaced along the axis;
• a plurality of cams spaced along the axis, wherein the plurality of cams is disposed along the camshaft in sets, wherein each set is disposed between a respective pair of journals of the plurality of journals;
• and
• wherein the first plurality of mass portions is disposed along the camshaft such that a center of mass of the plurality of mass portions is nearer to the drive end than to the opposite end, and the plurality of mass portions is configured to increase a natural frequency of the shaft.

A method of assembling a camshaft comprising:

• coupling a first end of a first camshaft segment to a second drive end of a second camshaft segment along a camshaft axis, wherein the first camshaft segment comprises:
• a first plurality of journals spaced along the camshaft axis;
• a first plurality of cams spaced along the camshaft axis, wherein the first plurality of cams is disposed along the camshaft axis in first sets, and each first set is disposed between a respective pair of journals of the first plurality of journals;
• and
• a first plurality of mass portions, wherein each mass portion of the first plurality of mass portions is disposed between a first set of cams of the first plurality of cams and a respective journal of the plurality of journals;
• wherein the second camshaft segment comprises:
• a second plurality of journals spaced along the camshaft axis;
• a second plurality of cams spaced along the camshaft axis, wherein the second plurality of cams is disposed along the camshaft axis in second sets, and each second set is disposed between a respective pair of journals of the second plurality of journals;
• wherein the first plurality of mass portions is disposed along the camshaft such that a center of mass of the first plurality of mass portions is nearer to a first drive end of the first camshaft segment than to a second end of the second camshaft segment, the first plurality of mass portions is configured to increase a natural frequency of the camshaft, the first drive end of the first camshaft segment is opposite the first end, and the second drive end of the second camshaft segment is opposite the second end.