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    • 4. 发明专利
    • POWER TRANSMITTING DEVICE FOR MOBILE AGRICULTURAL MACHINE
    • JPH11139176A
    • 1999-05-25
    • JP30700097
    • 1997-11-10
    • ISEKI AGRICULT MACH
    • KAMIYA HISASHIKONDA MITSUOOKIMOTO AKIRANIIMI SHIZUO
    • A01B71/02A01C11/02B60K17/28
    • PROBLEM TO BE SOLVED: To dispense with a transmission in a working machine, simplify a transmission inside a main gear box, and improve lateral weight balance by carrying out multistage speed change of a PTO shaft by means of the transmission inside the main bear box, using a back counter shaft in a passage transmitting power to a wheel in construction of the transmission, and arranging first and second PTO transmission gears on the left and right sides of an intermediate back gear. SOLUTION: In a main gear box, a main shaft 12 rotated by power from an engine, a wheel transmission shaft 13 transmitting power to a wheel, and a PTO transmission shaft 14 transmitting power to a PTO shaft 39 are arranged laterally in the respective apexes of a triangle. An intermediate back gear 23, which is always engaged with a back gear 20 fixed to the main shaft 12 and rotates the wheel reversely when a transmission gear 24 mounted in the wheel transmission shaft 13 is engaged, is installed to the PTO transmission shaft 14 freely rotationally. On the left and right sides of the intermediate back gear 23, first and second PTO transmission gear 37, 38, which are selectively engaged with gears 34, 35, 22, 36 fixed in the spindle 12 so as to give different rotations to the PTO shaft 14, are installed to the PTO shaft 14 so as not to rotate.