| 摘要 |
PURPOSE:To feed low temperature running air to an engine with high efficiency by a method wherein a pair of main frames on both sides and a cross member through which the main frames are intercoupled are formed in a hollow manner, and air introduction ports are formed in the former and air exhaust ports in the latter. CONSTITUTION:A pair of main frames 13 and lower frames 14 extending rearwardly along both sides of each of the upper and the lower part of a car body after extending laterally from a head pipe 11 are mounted to a car body frame 12 of a motor bicycle. The main frames 13 have the respective intermediate parts intercoupled through a cross member 23. In this case, the main frames 13 and the cross member 23 are formed in a hollow manner, and the hollow parts are intercommunicated. A plurality of air introduction ports 32 are formed in each of the outer sides of the front part of each main frame 13. A number of air exhaust ports 34 formed in the under surface of the cross member 23 are aligned in the direction of width. This constitution causes introduction of low temperature running air to a space 30 above an engine. |
