| 摘要 |
<p>PURPOSE:To enable, the cylinder or the cylinder head of an internal combustion engine to be evenly cooled by means of cooling air generated by a cooling fan directly connected to a crank shaft. CONSTITUTION:Many cooling fins 24 are formed on the outer peripheral surfaces of a cylinder block 14 and a cylinder head 15 at specific intervals and a centrifugal cooling fan 26 is integrally attached to the right end of a crank shaft 22, moreover the crank shaft 22 and the centrifugal cooling fan 26 are to be rotated clockwise seen from the right side of a vehicle body. The right side part 23b of the cooling fan 23 inclined forward and downward from the vehicle body by 45 deg. and then smoothly bent downward, and it is orientated in the circumferential direction perpendicular to a cylinder center line, and the fin left side part and lower part 23d on the left part and the lower part of the cylinder block 14 are orientated in the circumferential direction.</p> |
