PROBLEM TO BE SOLVED: To provide a simple coupling structure for coupling an output shaft and an input shaft of power, and to couple them appropriately.SOLUTION: In a work device coupling structure, a second universal joint 54, a relay transmission shaft 53, a first universal joint 52 are coupled to a side of an input shaft 47 of a work device 21. A power transmission coupling mechanism D is configured independently from a link coupling mechanism C. The work device coupling structure comprises a support cooperating mechanism 74 which supports an input part 70 disposed on a rear part of the first universal joint 52 at a fitting position which allows free fitting into a power output shaft 17 and a non-fitting position which is located on a lower side with respect to the fitting position in such a manner that the positions can be freely changed, and which moves the input part 70 in cooperation with over-riding advance traveling in which a right and left pair of front wheels 4 are caused to ride over the work device 21 from a rear part of the work device so that the position of the input part 70 is changed from the non-fitting position to the fitting position.COPYRIGHT: (C)2014,JPO&INPIT【課題】動力取出軸と入力軸との連結を行うための連結構造を簡易なものとしながら、その連結を適切に行うこと。【解決手段】第2自在継手54、中継伝動軸53、第1自在継手52は、作業装置21の入力軸47側に連結されており、動力伝達用連結機構Dは、リンク用連結機構Cとは独立して構成されており、第1自在継手52の後部に備えられた入力部70を、動力取出軸17に嵌合自在な嵌合位置とその嵌合位置よりも下方側に退避した非嵌合位置とに位置変更自在に支持し、且つ、左右一対の前輪4を作業装置21の後方から作業装置21を乗り越えさせる乗り越え前進走行に伴って、入力部70を非嵌合位置から嵌合位置に位置変更させるように連動させる支持連動機構74を備えている。【選択図】図3
