| 摘要 |
PURPOSE:To prevent the easy entry of a foreign materlal into a transmission case, passing through a discharge part during the traveling of a motorcycle when a discharge part for discharging the cooling wind from the inside of the transmission case of a driving unit is installed, and improve the degree of freedom in the selection of shape, when the shape of the discharge part is formed to a desired shape. CONSTITUTION:On a bottom part plate 48 which constitutes the bottom part of a transmission case 23, a discharge hole 53 which penetrates in the vertical direction through the bottom part plate 48 is formed. A duct 54 made of resin is fitted into the discharge hole 53. An introducing opening 57 for introducing the cooling wind supplied from the inside of the transmission case 23 is formed in the upper part of the duct 54. And in the lower part of the duct 54, a discharge opening 58 for discharging the cooling wind 37 from the inside is formed. The discharge opening 58 is opened rearwardly. |
