| 摘要 |
PURPOSE:To uniformly cool the whole cylinder without increasing the air amount by dividing the cooling-air passage of the cylinder head part to a plurality of parts in the right and left direction. CONSTITUTION:A cooling-air passage of the cylinder head part is arranged in a fan-case 2 which is fitted on the back of a shoulder frame 1 and is fitted with an engine 3 at the back. Said cooling-air passage is divided into two parts in the direction of pressurized air flow A to form passages 5a and 5b. Thus, most part of the cooling air from the passage 5a flows along the wall of the combustion chamber on the left side of a rib 18, due to the action of the rib 18, and a portion flows along the right side wall of the combustion chamber, and the cooling air from the passage 5b flows in the part at the back of the rib 18, and each air cools the engine, and effective cooling is obtained with a small amount of air. If the flow of the cooling air is controlled by arranging a guide 22, cooling effect is improved further. |
