| 摘要 |
PURPOSE:To prevent deformation of a spring sheet by constituting the spring sheet in a built-in form to valve springs of two or more of intake and exhaust valves arranged in parallel with a cam shaft and to maintain oil level low by forming a groove. CONSTITUTION:Three or more of intake and exhaust valves 22, 23 are provided for one cylinder and a spring sheet 29 receiving lower ends of valve springs 30A, 30B to two or more of intake and exhaust valves 22, 23 arranged in parallel with a cam shaft is formed to be elliptical built-in type. And a groove 24 is formed on a cylinder head positioned between these intake and exhaust valves 22, 23 and an oil escape passage is formed by the groove 24 to maintain the height of the oil level low and abnormal oil cumulation can be prevented. As the spring sheet 29 is a built-in type, deformation is not made even if the groove 24 is formed on the lower side and distance between valves can be made small. |
