| 摘要 |
PROBLEM TO BE SOLVED: To form oil passages with ease to crank cases divided into two, front and rear, without any specific pipes. SOLUTION: Crankcase 10 is divided into front case 10a and rear case 10b and fastened with bolt 50 from front. Space around bolt 50 forms a part of oil passage as bolt hole 51 that has a greater diameter. On the connection end surface 54 at side of front case 10a from among surfaces surrounding bore 48, oil groove 55 is formed from right end to left end connecting to bolt hole 51 at right end by gateway and to oil passage formed around bolt 45 at left end.
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