| 摘要 |
An air-cooled engine that is cooled by cooling air, the engine (10) comprising:
a crank case (31) for accommodating a crankshaft (12);
a cylinder block (33) that is formed integrally on the crank case (31) and is provided with a cylinder (26) having a reciprocating piston (61); and
a base (34) that is integrally formed on the crank case (31) and can be mounted on arbitrary mating member by a plurality of fastening members;
said air-cooled engine (10) is whereby
the base (34) comprises a plurality of mounting holes (123,124,125,126) through which the fastening members can be inserted; the cylinder block (33) is disposed at an incline in relation to the base (34) and has a plurality of cooling fins (141) formed integrally in the shape of a loop so as to encircle the outer periphery; and
the cooling fins (141) have base-side halves (143,152) that are disposed closer to the base (34) in relation to the axial line (109) of the cylinder (26) and are formed so as to be parallel to the bore center of the mounting holes (123,124,125,126).
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