| 摘要 |
PURPOSE:To reduce the number of parts used and enhance the cooling effect by forming a suction passage to the engine and a passage for cooling air from a single adapter for the suction pipe, and by allowing this adapter for suction pipe to throttle once the cooling air in the fan cowling. CONSTITUTION:A fan cowling 2 is formed at one side of a crank chamber 1, and therein a fan is installed as fixed to the crank shaft 3. An adapter 8 for the suction pipe is installed at that side of a cylinder head cover 4 where the fan cowling 2 is situated, wherein the sides of cylinder head cover 4 signify those situated at the two ends of the crank shaft 3. This adapter 8 is constituted from a suction assage member 9 in communication to the suction port and a passage member 10 for cooling air, molded as in a single piece. Said passage member 9 is formed by installing a flange 13 at each of the ends of a cylinder 11 and providing these flanges 13 with bolt holes 14. The other passage member 10 is formed as in a half cup 15, and the inlet 16 thereto is inserted in the ceiling of the fan cowling 2 while the outlet 17 shall be open inside the cover 4. |
