PROBLEM TO BE SOLVED: To provide a reaping speed change transmission of a combine harvester, which can improve the efficiency of reaping works, can reduce manufacture cost, and can be provided at a low cost.SOLUTION: The reaping speed change transmission of the combine harvester is characterized by rotatably attaching an output gear (10) which engages with an input gear (9) and at whose lower portion engaging pawls (10a) are disposed, to an output shaft (11), disposing upper engaging pawls (12a) at the upper end portion of a support pipe (13) loosely fit to the output shaft (11), attaching an intermediate gear (12) having a pawl clutch (12b) in the lower portion to the lower end portion of the support pipe (13), disposing a speed change gear (16) having a lower pawl clutch (16a) below the intermediate gear (12), interlocking the intermediate gear (12) with the speed change gear (16) through a speed change transmission route (18a), and slidably disposing a slider (15a) having an upper pawl portion (15b) engaged with the pawl clutch (12b) and a lower pawl portion (15c) engaged with the lower pawl clutch (16a) on the output shaft (11) only in the axial direction.COPYRIGHT: (C)2009,JPO&INPIT【課題】刈取作業の能率を向上させると共に、製造コストを低減し、安価に提供できるものとする。【解決手段】入力ギヤ(9)と噛み合い、下部に噛合爪(10a)を設けた出力ギヤ(10)を、出力軸(11)に回転自在に取付け、該出力軸(11)に遊嵌した支持パイプ(13)の上端部に上部噛合爪(12a)を設け、支持パイプ(13)の下端部には、下部に爪クラッチ(12b)を有した中間ギヤ(12)を取り付け、中間ギヤ(12)の下方に下爪クラッチ(16a)を有した変速用ギヤ(16)を設け、中間ギヤ(12)と変速用ギヤ(16)とを変速伝動経路(18a)によって連動し、爪クラッチ(12b)に噛み合う上爪部(15b)と下爪クラッチ(16a)に噛み合う下爪部(15c)とを有した摺動子(15a)を出力軸(11)上に軸芯方向摺動のみ自在に設ける。【選択図】図1
