| 摘要 |
A transmission is provided for driving a radial fan about a fan axis in a vehicle cooling unit including a plurality of heat exchangers arranged to surround the radial fan to receive a radial air flow therefrom. The radial fan receives an axial air flow from a front end of the cooling unit. At least one of the heat exchangers has a rearmost edge that defines a back end plane transverse to the fan axis, with none of the other heat exchangers having a rearmost edge that extends rearward beyond the back end plane. The transmission includes a driven pulley mounted to the cooling unit for rotation about the fan axis and connected to the radial fan to transmit a drive torque thereto, a driving pulley having an axis of rotation substantially parallel to the fan axis and spaced radially from the fan axis, at least one drive belt extending from the driving pulley to the driven pulley to transmit drive torque thereto, a tensioning lever mounted to pivot about a pivot axis that is substantially parallel to the fan axis and spaced radially from the fan axis, and an idler pulley mounted on the tensioning lever for rotation about an axis that is substantially parallel to the fan axis and spaced from the fan axis, the pivot axis, and the axis of rotation of the driving pulley. The idler pulley is engageable with the drive belt. The driving pulley, the driven pulley, and the idler pulley do not extend rearward beyond the back end plane.
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