PROBLEM TO BE SOLVED: To provide a transmission of a working vehicle in which a machine weight is relatively lightweight by minimizing the number of parts of a transmission mechanism to the utmost, while using an electric motor 9 as a drive source.SOLUTION: In the transmission of the working vehicle comprising a hydraulic stepless transmission device (HTS) 23 supplying driving force to a driving shaft 11a and driving the same by receiving driving force from a driving motor 9 arranged for carrying out advancing, retracting, stop, and acceleration/deceleration, the transmission device 23 has an input side cylinder block 84 housing an input shaft 80 driven by the motor 9, an input side swash plate 82, and a cylinder 84a, a port block 85 having a hydraulic closed circuit receiving oil pressure from the cylinder 84a according to the tilting angle of the swash plate 82 whose tilting angle is decided by a lever 16, an output side cylinder block 86 housing a cylinder 86a receiving oil pressure from the hydraulic closed circuit, an output side swash plate 88 receiving oil pressure from the cylinder block 86a, and an output shaft 81 integral with the plate 88.COPYRIGHT: (C)2012,JPO&INPIT【課題】電動モータ9を駆動源としながら伝動機構の部品数を極力少なくして機体重量が比較的軽量な作業車両の変速装置を提供すること。【解決手段】駆動軸11aに駆動力を供給すると共に、前進・後進・停止及び加減速を行なうために設けた駆動モータ9から駆動力を受けて駆動する油圧式無段変速装置(HST)23からなる作業車両の変速装置であって、変速装置23はモータ9により駆動される入力軸80と入力側傾斜板82とシリンダ84aを内装した入力側シリンダブロック84とレバー16により傾動角度が決められる傾斜板82の傾動角度に応じて、シリンダ84aからの油圧を受ける油圧閉回路を有するポートブロック85と該油圧閉回路からの油圧を受けるシリンダ86aを内装した出力側シリンダブロック86とシリンダ86aからの油圧を受ける出力側傾斜板88と該板88と一体の出力軸81とを有する。【選択図】図3
