Method of Manufacturing Cam Shaft, Cam Shaft, and Cam Lobe Material Used in the Same
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United States of America Patent
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Issued Date -
Nov 13, 2008
app pub date -
Oct 28, 2004
filing date -
Oct 31, 2003
priority date (Note) -
Abandoned
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Abstract
A method of manufacturing a cam shaft that prevents cracks during the joining of a cam lobe to a shaft, and improves the degree of freedom of design of the cam lobe is provided. By a method of manufacturing a cam shaft that after an inner circumferential surface 13 of a cam lobe 1 is subjected to treatment for residual compressive stress addition treatment, the cam lob 1 is joined to a shaft, above problem is solved. It is preferred that the residual compressive stress on the inner circumferential surface 13 of the cam lobe 1 is not less than 100 MPa. In addition, an outer peripheral surface 14 of the cam lobe 1 can be also subjected to treatment for residual compressive stress addition treatment. As the treatment for residual compressive stress addition treatment, shot-peening treatment, induction hardening treatment, barrel polishing treatment, carburizing and quenching treatment or carbonitriding treatment is performed.
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