PROBLEM TO BE SOLVED: To provide a transmission device for a working vehicle which can avoid the damage or the like of an O-ring by regulating the displaceable movement of a pressing piston while using a slide bearing.SOLUTION: A transmission device for a working vehicle comprises: a drive-side clutch body 87 a driven-side clutch body 86 energization means for elastically pressing the driven-side clutch body 86 to an engagement side at which the driven-side clutch body is made to approximate the drive-side clutch body 87 and a pressing piston 101 for operating the driven-side clutch body 86 to an engagement-release side at which the driven-side clutch body separates from the drive-side clutch body 87. An annular slide bearing receiver 70 for permitting the relative rotation of the pressing piston 101 and the driven-side clutch body 86 is interposed in an opposing point between the pressing piston 101 and the driven-side clutch body 86, and a co-rotation regulation mechanism for permitting the relative rotation between the driven-side clutch body 86 and the slide bearing, and suppressing the relative rotation between the pressing piston 101 and the slide bearing is arranged at the slide bearing receiver 70.SELECTED DRAWING: Figure 4COPYRIGHT: (C)2018,JPO&INPIT【課題】滑り軸受けを用いながら、押圧ピストンのずれ動きを規制してOリングの損傷等を回避できるようにした作業機用伝動装置を提供する。【解決手段】駆動側クラッチ体87と、従動側クラッチ体86と、従動側クラッチ体86を前記駆動側クラッチ体87へ近づける係合側へ弾性押圧する付勢手段と、従動側クラッチ体86を駆動側クラッチ体87から離れる係合解除側へ操作する押圧ピストン101と、が備えられ、押圧ピストン101と従動側クラッチ体86との対向箇所に、押圧ピストン101と従動側クラッチ体86との相対回転を許容する環状の滑り軸受け70が介装され、滑り軸受け70に、従動側クラッチ体86との間における相対回転を許容し、かつ押圧ピストン101との間における相対回転を抑制する連れ回り規制機構が備えられている。【選択図】図4
