| 摘要 |
PROBLEM TO BE SOLVED: To prevent generation of any casting defect when casting a lower casing of a crank case to support a crankshaft. SOLUTION: An engine 1 includes a pair of right and left aluminum side members 11, 12 extending along a crankshaft 5 and disposed on the right and left of the crankshaft 5, and a laterally extending cross member 13 provided between the side members 11, 12. The cross member 13 comprises an aluminum cross member body 14 provided between the side members 11, 12, and a cast-iron supporting member 17 having a semi-circular supporting recess 15 on its top surface 16 for the crankshaft 5 to be fitted in at the lower half of a journal 4, and built in the cross member body 14 while leaving the top surface 16. The side members 11, 12 and the cross member body 14 are integrally formed through aluminum casting by using the supporting member 17 as an insert member. A notch 23 is formed at a lower end of the supporting member 17 located below the supporting recess 15. COPYRIGHT: (C)2005,JPO&NCIPI
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