| 摘要 |
<p>PURPOSE:To enable a valve to be optionally switched to its operative and inoperative state through a control of the oil pressure, by mutually turnably fitting cams to a cam shaft and pressing the cam by the oil pressure to a tapered surface, provided in the cam shaft, so as to enable the cam to be connected with the cam shaft. CONSTITUTION:When cams 2, which drive intake and exhaust valves 8, are detached from tapered surfaces 6 of a cam shaft 1 by springs 7, the cam 2 is not rotated in no relation to turning of the cam shaft 1, and the intake and exhaust valves 8 are not operated opening and closing. While a pressure oil chamber 5 is formed in a side surface of the cam 2, and when pressure oil is supplied from an oil hole 9, the pressure oil in the pressure oil chamber 5 firmly connects the cam shaft 1 with the cam 2 by pressing it a side of the tapered surface 6 of the cam shaft 1 against the spring 7. In this way, the cam 2 also rotates together with rotation of the cam shaft 1, and the intake and exhaust valves 8 can be opened and closed.</p> |
