Transmission for agricultural tractor

A transmission for an agricultural working vehicle comprising:

• first and second transmission shafts rotatably supported in a transmission case, the first transmission shaft being operatively connected to an engine, the second transmission shaft being operatively connected to axles,
• driving and driven sprockets operatively connected to each other by a wrapping connector, the driving sprocket being fixed to the first transmission shaft, the driven sprocket being relatively rotatably mounted on the second transmission shaft,
• a plurality of change speed gears fixed to the first transmission shaft,
• a shift gear splined to the second transmission shaft to be slidable relative thereto and including gear portions selectively engageable with said plurality of change speed gears when assuming change speed positions, and
• engaging means for placing the shift gear and the driven sprocket in mutual engagement when the shift gear assumes a position other than the change speed positions;
• wherein the first transmission shaft is transversely supported at a front portion of the transmission case, the second transmission shaft being transversely supported rearwardly of the first transmission shaft, a third transmission shaft and the rear axles being transversely supported rearwardly of the second transmission shaft and one above the other, and wherein the second transmission shaft and the third transmission shaft are operatively connected to each other by a wrapping connector so as to effect reduction, the third transmission shaft and the axles being operatively connected to each other by a wrapping connector so as to effect reduction, and wherein the front portion of the transmission case has a smaller veritcal dimension than a rear portion thereof and is disposed at a lower level than a top of the rear portion, and wherein the first and second transmission shafts are supported in the front portion, the third transmission shaft and the axles being supported in the rear portion, and wherein a driving rotary member of a sidewise wrapping connector driving mechanism for operatively connecting the first transmission shaft to the engine is disposed above the front portion of the transmission case.