| 摘要 |
PURPOSE:To reduce the cost of production, by forming part of a rocker arm into a quite sameness whereby making them have interchangeability each other, in case of a torch ignition type engine carrying two suction valves, one exhaust valve and one auxiliary suction valve per cylinder. CONSTITUTION:In case of a torch ignition type engine provided with two suction valves 11, one exhaust valve and one auxiliary suction valve 22 besides an auxiliary combustion chamber 17, a cam shaft 30 is installed in an almost central part between each group of main suction valves and exhaust valves, while both first and second rocker arms 36 and 37 are set up in position between this cam shaft 30 and both these valve groups. Each valve is driven to open or close via a rocker arm 45. One of these rocker arms for main suction valve use and one rocker arm for exhaust valve use are formed up in a quite sameness whereby they have interchangeability each other, contributing to a reduction in manufacturing costs. In addition, four valve gear cams on top of the cam shaft 30 are set up in position between two bearings, thus rigidity in the cam shaft is improved. |
