| 摘要 |
PURPOSE:To achieve a smooth function of a valve by arranging a freely rotatable high speed cam between two low speed cams for driving a single valve and sliding a low speed cam at one side hydraulically when a high speed cam is used thereby holding the high speed cam between them. CONSTITUTION:When a single valve 3 is driven, first low speed cam 10 coupled through a key 11 and second low speed cam 14 gearing with a spline 10b on the shaft 10a of the first low speed cam 10 and rotating integrally are provided on the camshaft 7, and a high speed cam 13 is provided between the first and second low speed cams 10, 14. The high speed cam 13 is rotatable freely on the outer circumference of the shaft 10a of the first low speed cam 10. When a valve 24 is opened and the pressure oil is fed from a tube 23, a cylinder 18 is functioned and the high speed cam 13 is held between the first and second low speed cams 10, 14. Consequently, the valve 3 is opened by means of the high speed cam 13 having a long valve open interval.
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