Patent ID: 8770157

Claim:
A cylinder cooling apparatus for an air-cooled engine, comprising: a cooling fan provided on one end section of a crankshaft, a pair of pushrod insertion holes for air intake and exhaust valves formed in a cylinder outer circumferential wall section on the side approximately orthogonal to the axial direction of the crankshaft and disposed with a space provided therebetween in the axial direction of the crankshaft, a fan shroud for covering the cooling fan and for covering the cylinder outer circumferential wall section in which the pushrod insertion holes are formed, a cutout ventilating section formed in the cylinder outer circumferential wall section between the pair of pushrod insertion holes, tunnel-shaped ventilating holes formed in the cylinder outer circumferential wall section between the pushrod insertion hole disposed on the side of the cooling fan and a cylinder bore and extending from the cylinder outer circumferential wall section on the side of the cooling fan to the cutout ventilating section, and a gasket sandwiched between the cylinder and the cylinder head, wherein the cutout ventilating section and the tunnel-shaped ventilating hole are disposed on an opposite side of the gasket from the cylinder head.