| 摘要 |
According to the present invention, there is provided a valve train apparatus of 4-stroke internal combustion engine comprising an intake cam shaft (2) and an exhaust cam shaft (3) in which the lift of intake valve (10) is continuously varied by controlling rotations of the intake cam shaft (2) and an eccentric cam shaft (4a) via an intermediate lever (5a) contacting the intake cam shaft (2) and the eccentric cam shaft (4a) as well as via a rocker arm (7a) contacting the intermediate lever (5a) characterized in that all of or either two of a separating plane (4c) of a bearing of the eccentric cam shaft (4a), a separating plane (4a) of a bearing of the intake cam shaft (2) and a paring surface of a bearing of the exhaust cam shaft (3) are arranged on a coplanar surface.
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