PROBLEM TO BE SOLVED: To solve the problems that device cost increases because an axle drive device such as a combine conventionally uses an expensive hydraulic continuously variable transmission for both a first continuously variable transmission for travelling drive and a second continuously variable transmission for turning drive.SOLUTION: A second continuously variable transmission for turning drive is a friction transmission 32 that comprises: an input shaft 59 rotationally driven by an engine 27 driving side rotary discs 67 and 68 supported by the input shaft 59 output shafts 71 and 72 arranged orthogonally in the input shaft 59 and driven rotary discs 69 and 70 supported by the output shafts 71 and 72, where peripheral edges 67a and 68a of the driving side rotary discs 67 and 68 are frictionally engaged with inner surfaces 69a and 70a of the driven side rotary discs 69 and 70, and relative positions of the frictionally engaged portion are shifted by shift forks 75R and 75L so as to extract power for turning and shift change from the output shafts 71 and 72.COPYRIGHT: (C)2014,JPO&INPIT【課題】従来より、コンバイン等の車軸駆動装置では、走行駆動用の第一無段変速装置と旋回駆動用の第二無段変速装置のいずれにも高価な油圧式無段変速装置を用いたため、装置コストが増加する、という問題があった。【解決手段】旋回駆動用の第二無段変速装置は、エンジン27によって回転駆動される入力軸59と、該入力軸59に支持される駆動側回転ディスク67・68と、前記入力軸59に直交配置される出力軸71・72と、該出力軸71・72に支持される従動側回転ディスク69・70とを備え、前記駆動側回転ディスク67・68のディスク周縁67a・68aを従動側回転ディスク69・70のディスク内面69a・70aに摩擦係合させ、該摩擦係合部の相対位置をシフトフォーク75R・75Lで変化させることにより、旋回変速動力を出力軸71・72から取り出す摩擦変速装置32とした。【選択図】図4
