PROBLEM TO BE SOLVED: To provide a guard plate 353 to protect a straight-line traveling output detection means 93 and a gyration output detection means 95 attached to a transmission case 88 from mud, etc., having a structure easily attachable to the transmission case 88 and having a small number of parts.SOLUTION: A hydraulic transmission case 350 containing hydraulic continuously variable transmission mechanisms for straight-forwarding and gyration motion 53, 54 is attached to the upper side of right or left side of the transmission case 88. A PTO pulley 119 is placed at a protrusion side of a PTO shaft 99 protruding sideways outward from the side face of the transmission case 88 opposite to the side of the hydraulic transmission case 350. The straight-line traveling output detection means 93 to detect the speed variation output level of the straight-line hydraulic continuously variable transmission mechanism 53 and the gyration output detection means 95 for detecting the speed variation output level of the gyration motion hydraulic continuously variable transmission mechanism 54 are placed below the PTO shaft 99 of the transmission case 88 in a longitudinally aligned state. The outer circumference of both output detection means 93, 95 is covered with the guard plate 353 positioned between the transmission case 88 and the PTO pulley 119 by front view.COPYRIGHT: (C)2011,JPO&INPIT【課題】ミッションケース88に設けられた直進出力検出手段93と旋回出力検出手段95とを泥土等から保護するガード板353に関して、ミッションケース88に取り付け易い構造で且つ部品点数も少なくする。【解決手段】ミッションケース88における左右一側面の上部側に、直進用及び旋回用油圧式無段変速機構53,54を内蔵する油圧変速ケース350を取り付ける。前記ミッションケース88のうち前記油圧変速ケース350と反対側の側面から横方向外向きに突出したPTO軸99の突端側に、PTOプーリ119を配置する。前記ミッションケース88のうち前記PTO軸99より下方に、前記直進用油圧式無段変速機構53の変速出力量を検出する直進出力検出手段93と、前記旋回用油圧式無段変速機構54の変速出力量を検出する旋回出力検出手段95とを、前後に並べて配置する。正面視で前記ミッションケース88と前記PTOプーリ119との間に位置するガード板353によって、前記両出力検出手段93,95の外周側を覆う。【選択図】図15
