PROBLEM TO BE SOLVED: To compactly and integrally constitute a detent mechanism and a neutral fine-adjustment mechanism of a trunnion shaft in a relatively-higher space while avoiding the complication of structure.SOLUTION: A cam 25 which turns integrally with a main speed change lever 13, and turns the trunnion shaft via a rod 24 is arranged at a base of the main speed change lever 13, a main adjusting mechanism which adjusts a relative position between the main speed change lever 13 and the trunnion shaft is arranged in the rod 24, a cam arm 26 which press-contacts with a neutral holding recess 25a formed at the cam 25 and holds the trunnion shaft in a neutral position is arranged in the recess, a turning pivot of the cam arm 26 is made to be adjustable in position, and the fine adjustment mechanism for finely adjusting the relative position between the neutral position of the main speed change lever 13 and the neutral holding position of the trunnion shaft on the basis of the position adjustment is constituted.COPYRIGHT: (C)2013,JPO&INPIT【課題】トラニオン軸のデテント機構及び中立微調節機構を、構造の複雑化を回避しつつ比較的上位の空間にコンパクトに集約して構成する。【解決手段】主変速レバー13の基部に、該主変速レバー13と一体的に回動し、ロッド24を介してトラニオン軸を回動させるカム25を設け、ロッド24中に、主変速レバー13とトラニオン軸の相対位置を調節する主調節機構を設けると共に、カム25に形成される中立保持用凹部25aに係合状に押接してトラニオン軸を中立位置に保持するカムアーム26を設け、該カムアーム26の回動支点を位置調節自在とし、該位置調節に基づいて主変速レバー13の中立位置とトラニオン軸の中立保持位置との相対位置を微調節する微調節機構を構成した。【選択図】図5
