| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a valve system which is so constituted that an increase in volume and weight is restrained, and concurrently, the intake/exhaust timing in a four cycle can be kept normal for the long period of time. SOLUTION: A cam 20 provided for a cam shaft 19 is formed into an integral structure where an intake cam part 20A and an exhaust cam part 20B which have cam profiles setting the open/close timing of an intake valve and an exhaust valve respectively, are formed while being adjacent to each other in the shaft direction of the cam shaft 19, and a partition plate 25 is provided in a space between both the cam parts 20A and 20B, which restricts the movement in the axial direction of a cam follower member 21 that is slipperily brought into contact with those cam parts 20A and 20B.</p> |
