| 摘要 |
<p>In a partially liquid-cooling type forcedly air-cooling system for an internal combustion engine which includes an air-cooled cylinder (4) and a liquid-cooled cylinder head (5), a centrifugal cooling fan (11) is provided in front of a crankcase (3) so as to rotate about the fore and rear axis thereof, and a cooling air delivery opening (29) is provided at the back portion (28) of a draft chamber (27) within a fan casing (24) which encircles the cooling fan (11) so as to orientate at least to the cylinder (4). And a portion (26), which is arranged at the side of the cylinder head (5), of the encircling wall (25) of the fan casing (24) is provided with an opening (38). And the cylinder (4) is adapted to be cooled adequately by the cooling air flow delivered through the opening (29), as well as a radiator (36) is adapted to be cooled effectively by the cooling air flow passing through the opening (38) provided in the encircling wall (25) of the fan casing (24) so that at least a portion of the cylinder head (5) can be cooled intensively.</p> |
