| 摘要 |
PURPOSE:To avoid the interference of a rocker shaft with a connect-disconnect hole by dividing the rocker shaft on one side into two parts and installing the connect-disconnect hole for an ignition plug in the space between them in an overhead camshaft type engine with 4 valves per head. CONSTITUTION:For one cylinder, two exhaust valves are arranged in the front and two intake valves in the rear of the cylinder, and a single camshaft 13 which drives these valves is arranged between the intake valves and the exhaust valves. While a rocker arm 36 which transmits driving force to intake valves is supported by a common rocker shaft 37, rocker arms 32 and 33 which transmit driving force to exhaust valves are supported by separate rocker shafts 34 and 35 respectively, and a connect-disconnect hole for an ignition plug 38 is formed so that the electrode is arranged in the space between both rocker shafts 34 and 35 on the center line of the combustion chamber. By this constitution the interference of the rocker shaft with the connect-disconnect hole can be avoided. |
