| 摘要 |
PURPOSE: A continuously variable transmission of a tractor is provided to reduce an installation space by arranging a frond end carrier, a back end carrier, a power transmission axis, a subsidiary power axis, and a transmission axis in a row. CONSTITUTION: An HST(Hydrostatic Transmission)(5) includes a hydraulic pump(1), and a hydraulic motor(2). An input axis(3) is combined with a motor axis of the hydraulic motor. A power axis(4) includes a power transmission gear. The power transmission gear engages with an input gear mounted on the input axis. A sun gear of a front end carrier(81) is connected to the power axis. A sun gear of a back end carrier(82) engages with an angle planetary gear. A ring gear(9) includes an inside gear and an outside gear. A subsidiary power axis(10) includes the first and the second subsidiary transmission gear. [Reference numerals] (AA,EE) First stage; (BB,GG) Second stage; (CC,HH) Third stage; (DD,FF) Fourth stage; (II) Moving backward; (JJ) Moving forward
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