PROBLEM TO BE SOLVED: To stabilize the operation of a reaping part which is driven via a static hydraulic continuously variable transmission and a planetary gear mechanism.SOLUTION: A planetary gear mechanism (70) is arranged between an output shaft (38) of a static hydraulic continuously variable transmission (21) which is driven by an engine (22) and a reaping output shaft (45A) which outputs a drive force to a reaping part (4), and the rotation of the output shaft (38) of the static hydraulic continuously variable transmission (21) and the rotation of an input shaft (37) of the static hydraulic continuously variable transmission (21) are synthesized by the planetary gear mechanism (70), and outputted from a reaping output shaft (45A). Furthermore, the planetary gear mechanism (70) forwardly rotates the rotation of the output shaft (38) from reverse rotation via zero-rotation, and transmits it to the reaping output shaft (45A). A one-way clutch (80) for preventing the transmission of the reverse rotation to the reaping part (4) is arranged between the reaping output shaft (45A) and a reaping output pulley (45) which is arranged at the reaping output shaft (45A).COPYRIGHT: (C)2015,JPO&INPIT【課題】静油圧式無段変速装置と遊星歯車機構を介して駆動される刈取部の作動を安定させる。【解決手段】エンジン(22)によって駆動される静油圧式無段変速装置(21)の出力軸(38)と、刈取部(4)へ駆動力を出力する刈取出力軸(45A)の間に遊星歯車機構(70)を設け、静油圧式無段変速装置(21)の出力軸(38)の回転と、静油圧式無段変速装置(21)の入力軸(37)の回転を遊星歯車機構(70)で合成して、刈取出力軸(45A)から出力する構成とする。また、遊星歯車機構(70)は、出力軸(38)の回転を、逆回転から零回転を経て正回転させて刈取出力軸(45A)へ伝達する構成とし、刈取出力軸(45A)と刈取出力軸(45A)に備えた刈取出力プーリー(45)の間には、刈取部(4)への逆回転の伝達を防止するワンウェイクラッチ(80)を備える。【選択図】図8
