| 摘要 |
PROBLEM TO BE SOLVED: To reduce the number of part items and cost and improve an assembly efficiency while keeping a cooling efficiency sufficiently. SOLUTION: One part of the lower side of the intake port side of cooling fins 3, 3 formed on the side of a cylinder 2 is extended to the inner surface side of a shroud 19 (projected fins 3a, 3a) and one part of a cooling passage is constituted by connecting this projected fins 3a, 3a integrally with the shroud 19 by bolts 21, 21. Therefore, the gap between the shroud 19 and the cylinder 2 is blocked surely without requiring a complicate cover plate to the gap between the shroud 19 and the cylinder 2 and then a cooling efficiency is sufficient and the number of parts and cost can be reduced and an assembly efficiency is improved.
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