PROBLEM TO BE SOLVED: To provide a working machine, the turnability of which can be improved by reducing the speed of a turning-direction-side rear wheel by using one actuator and the straight advanceability of which can also be improved without increasing the cost or the weight of an electric motor.SOLUTION: The working machine (1) includes: differential gears 60L, 60R each comprising a planetary gear mechanism including three elements an input shaft (34) for transmitting the power from an engine 2 to first elements (61), (61) rear wheel transmission shafts 36L, 36R which are connected respectively to second elements (63), (63) and used respectively for transmitting the power to the rear wheels 21L, 21R worm gear mechanisms 40L, 40R for transmitting the power respectively to third elements (64), (64) one-way clutches 50L, 50R capable of transmitting the power respectively to the worm gear mechanisms 40L, 40R the electric motor 30 capable of transmitting the power to the one-way clutches 50L, 50R and a control part 80 for controlling the rotative direction and rotational speed of the electric motor 30 according to an operation of a handle sensor 81.COPYRIGHT: (C)2013,JPO&INPIT【課題】一つのアクチュエータで旋回方向側の後車輪を減速して旋回性の向上を図ることができ、かつ、電動モータのコストアップや重量が増加することなく直進性の向上を図ることができる作業機を提供する。【解決手段】三つの要素を備える遊星歯車機構からなる差動装置60L・60Rと、第一の要素(61)・(61)にエンジン2からの動力を伝達する入力軸(34)と、第二の要素(63)・(63)と連結され、後車輪21L・21Rに動力を伝達する後輪伝動軸36L・36Rと、第三の要素(64)・(64)に動力を伝達するウォームギヤ機構40L・40Rと、ウォームギヤ機構40L・40Rの一方に動力を伝達可能なワンウェイクラッチ50L・50Rと、ワンウェイクラッチ50L・50Rに動力を伝達可能な電動モータ30と、ハンドルセンサ81の操作に応じて電動モータ30の回転方向及び回転速度を制御する制御部80と、を備える作業機(1)。【選択図】図3
