JP4074015B2

JP4074015B2 - Mobile farm machine

Info

Publication number: JP4074015B2
Application number: JP30950598A
Authority: JP
Inventors: 崎晃一川; 田正明織; 田睦町; 松真弥小
Original assignee: Yanmar Agricultural Equipment Co Ltd
Current assignee: Yanmar Agricultural Equipment Co Ltd
Priority date: 1998-10-14
Filing date: 1998-10-14
Publication date: 2008-04-09
Anticipated expiration: 2018-10-14
Also published as: JP2000118430A

Description

【０００１】
【発明の属する技術分野】
本発明は例えば圃場の穀稈を連続的に刈取って脱穀するコンバインなどの移動農機に関する。
【０００２】
【従来の技術】
従来、左右走行クローラを装設したコンバインで圃場の未刈り穀稈列に沿わせて走行移動させ乍ら収穫作業を行うと共に、圃場枕地で前記コンバインを方向転換させて次工程の未刈り穀稈列に移動させていたが、エンジン出力を変速伝達するミッションケースの左右走行出力を左右サイドクラッチを介して左右走行クローラに伝達させ、左右サイドクラッチの継断操作により左右走行クローラの一方を一時的に停止させて旋回させることにより、左右サイドクラッチ操作と走行変速操作の両方を作業者が略同時期に行う必要があり、また圃場枕地で方向転換するときの旋回半径が大きくなる不具合があった。そこでエンジンの動力を各別に伝える左右油圧無段変速機を設けて左右走行クローラを駆動することにより、旋回時の減速並びに旋回半径の縮少などを容易に行えるが、直進性能が低下し易く、未刈り穀稈列に沿わせて走行移動させる操向操作が面倒になる不具合があった。また左右走行クローラにエンジン動力を変速伝達する単一の油圧無段変速機構と、旋回内側の走行クローラを減速しかつ旋回外側の走行クローラを増速させる油圧無段操向機構を設けることにより、直進性能を良好に維持でき、かつ旋回半径も容易に縮少できるが、走行速度を高速にすることによって旋回半径が大きくなったり、走行速度を低速にすることによって旋回半径が小さくなる不具合があり、例えば四輪自動車のように走行速度に関係なく旋回半径を略一定に保つ操舵感覚を得るには、走行変速操作時、走行速度の変化に応じて作業者が操舵操作量を感覚的に変更させる必要があり、直進走行によって行う農作業時に蛇行走行させて未刈り穀稈列から離れ易くなる等の取扱い上の問題がある。特に、丸形の操向ハンドルを設ける場合、左右サイドクラッチ及び左右サイドクラッチレバーを設ける操舵構造に比べて、走行速度を一定維持した状態で操舵性を向上させることができるが、走行変速によって蛇行し易く、四輪自動車の運転感覚での操舵を容易に行い得ず、走行変速操作及び操向操作など運転操作性の向上並びに操縦機能の向上などを容易に図り得ない等の問題があった。そこで当出願人はエンジンの駆動力を左右走行クローラに伝える差動機構と、左右走行クローラの駆動速度を無段階に変更させる変速部材と、左右走行クローラの駆動速度の差を無段階に変化させる操向部材を設ける移動農機において、操向操作具によって回転させる操向入力軸と、変速操作具によって回転させる変速入力軸と、変速入力軸を変速部材に連結させる変速機構と、操向入力軸を操向部材に連結させる操向機構を設け、変速機構動作量に比例させて操向機構操向量を変化させるように構成し、高速側走行変速によって操向量を自動的に拡大し、かつ低速側走行変速によって操向量を自動的に縮少し、操向操作具の一定量の操作によって走行速度に関係なく左右走行クローラの旋回半径を略一定に維持し、農作業走行速度の変更並びに作物列などに機体を沿わせる進路修正などを容易に行う技術を開発した。
【０００３】
【発明が解決しようとする課題】
上記の技術は、要するに、運転席前方の丸ハンドル式のステアリングコラムに旋回用ＨＳＴへの操向操作出力部と共に運転席側方のサイドコラムからの主変速操作入力部及び直進用ＨＳＴへの主変速操作出力部を設け、主変速操作を直接直進用ＨＳＴに伝えるのではなく、一旦ステアリングコラムに入力して直進用ＨＳＴに伝えるようにし、ステアリングコラムの内部機構によって入力された主変速操作量に比例させて操向操作量を変化させ、その操向操作を旋回用ＨＳＴに伝えるのであるが、サイドコラムからの主変速操作をステアリングコラムに伝える主変速操作伝達部材と、ステアリングコラムからの主変速操作及び操向操作を直進用ＨＳＴ及び旋回用ＨＳＴに伝える主変速操作伝達部材及び操向操作伝達部材等、比較的長い操作伝達部材が必要となり、これらの操作伝達部材を用いて適正に主変速操作及び操向操作を伝達できないと所望の機能を得られない。
【０００４】
従って、本発明は、特に丸ハンドル式のステアリングコラムから直進用ＨＳＴ及び旋回用ＨＳＴへの主変速操作及び操向操作を適正に伝えることができる移動農機を提供することを目的としている。
【０００５】
また、駐停止時にサイドコラムの主変速レバーなどの主変速操作部の誤操作により、主変速操作がステアリングコラムに伝えられ、ステアリングコラム内部機構を破損させたり機体を走行させるのを防止することができ、且つその機構を、上記したステアリングコラムから直進用ＨＳＴ及び旋回用ＨＳＴへの主変速操作及び操向操作を適正に伝えるためのメンテナンスなどの、障害にならないように設けることができる移動農機を提供することを目的としている。
【０００６】
【課題を解決するための手段】
上記目的を達成するための本発明の移動農機は、運転席前方の丸ハンドル式のステアリングコラムに旋回用ＨＳＴへの操向操作出力部と共に運転席側方のサイドコラムからの主変速操作入力部及び直進用ＨＳＴへの主変速操作出力部を設けた移動農機において、前記各ＨＳＴを搭載するミッションを前記サイドコラムの下方に配設し、ステアリングコラムの操向操作出力部と旋回用ＨＳＴとの間で操向操作を伝達する長さ調節自在な操向操作伝達部材と、ステアリングコラムの主変速操作出力部と直進用ＨＳＴとの間で主変速操作を伝達する長さ調節自在な主変速操作伝達部材とを設け、各伝達部材の長さ調節部をミッション部上側に配設する。これによってステアリングコラムとサイドコラムと旋回用ＨＳＴ及び直進用ＨＳＴを搭載するミッションの三者を従来に比べ接近配置し、主変速操作及び操向操作の伝達距離の短縮を図り、これら操作の伝達精度を上げる、即ち主変速操作及び操向操作精度を上げる。また主変速操作及び操向操作の各操作系やその他サイドコラム内部機構に対する泥及び塵埃の付着をミッション及びミッション部の防塵カバーなどで防止し、主変速操作及び操向操作の伝達精度を下げる要因を減らす。さらにステアリングコラムから旋回用ＨＳＴ及び直進用ＨＳＴへの操向操作伝達部材及び主変速操作伝達部材の長さ調節を、旋回用ＨＳＴ及び直進用ＨＳＴの操向操作入力部及び主変速操作入力部の状態を目視確認しながら適正に行え、主変速操作系及び操向操作系を適正に形成し、且つメンテナンスも簡単に行え、これらを常に適正状態に保ち、主変速操作及び操向操作の伝達精度を上げる、即ち主変速操作及び操向操作精度を上げる。
【０００７】
また、運転席前方の丸ハンドル式のステアリングコラムに旋回用ＨＳＴへの操向操作出力部と共に運転席側方のサイドコラムからの主変速操作入力部及び直進用ＨＳＴへの主変速操作出力部を設けた移動農機において、前記各ＨＳＴを搭載するミッションを前記サイドコラムの下方に配設し、前記ミッションに設ける駐車ブレーキをかけた時、サイドコラムの主変速レバーを中立位置に保持又は復帰保持させる牽制機構を設けると共に、前記牽制機構を主変速レバー支点より上部に配設する。これによって駐停止時にサイドコラムの主変速レバーなどの主変速操作部の誤操作を防止し、駐停止時に主変速操作部を確実に中立位置に保持し、誤った主変速操作がステアリングコラムに伝えられ、ステアリングコラム内部機構を破損させたり機体を走行させるのを防止する。またステアリングコラムから旋回用ＨＳＴ及び直進用ＨＳＴへの操向操作伝達部材及び主変速操作伝達部材の長さ調節を行うためのミッションの上部空間を、前記牽制機構によって埋めてしまうのを防止し、前記操向操作伝達部材及び主変速操作伝達部材の長さ調節を簡単に行え、主変速操作系及び操向操作系を適正に形成し、且つメンテナンスも簡単に行え、これらを常に適正状態に保ち、主変速操作及び操向操作の伝達精度を上げる、即ち主変速操作及び操向操作精度を上げる。
【０００８】
また、サイドコラムの運転席側側壁又は／及び運転台のステップ板を開閉自在に形成する。これによってサイドコラム内部でミッション上側の主及び副変速操作系及び操向操作系及び駐車ブレーキ操作及び牽制機構及びその他サイドコラム内部機構などのメンテナンスが運転席側から簡単に行え、これらを常に適正状態に保つ。
【０００９】
本願明細書中の「ＨＳＴ」と言う用語は、油圧駆動装置（ｈｙｄｒｏ−ｓｔａｔｉｃｔｒａｎｓｍｉｓｓｉｏｎ）を意味し、これは油圧を用いて動力伝達を行うもので、まず油圧ポンプを機関で駆動し、発生した圧力油を油圧モータに導き、動力を伝達する構造になっている。また速度の調節は、斜板とプランジャによる可変容量形ポンプを用いて油量を変化させることにより行う。
【００１０】
【発明の実施の形態】
以下、本発明の実施例を図面に基づいて詳述する。図１はコンバインの全体側面図、図２は同平面図であり、図中（１）は左右一対の走行クローラ（２）を装設するトラックフレーム、（３）は前記トラックフレーム（１）に架設するシャーシフレーム、（４）はフィードチェン（５）を左側に張架し扱胴（６）及び処理胴（７）を内蔵している脱穀部、（８）は刈刃（９）及び穀稈搬送機構などを備える刈取部、（１１）は刈取フレーム（１２）を介して刈取部（８）を昇降させる油圧シリンダ、（１３）は排藁チェン（１４）終端を臨ませる排藁処理部、（１５）は脱穀部（４）からの穀粒を揚穀筒（１６）を介して搬入する穀物タンク、（１７）は前記タンク（１５）の穀粒を機外に搬出する排出オーガ、（１８）は丸形の操向ハンドル（１９）及び運転席（２０）などを備える運転台、（２１）は運転席（２０）下方に設けるエンジンであり、連続的に穀稈を刈取って脱穀するように構成している。
【００１１】
さらに、図３に示す如く、前記走行クローラ（２）を駆動するミッション（２２）は、１対の第１油圧ポンプ（２３）及び第１油圧モータ（２４）を備えて走行主変速用の油圧式無段変速機構を形成する直進用ＨＳＴ（２５）と、１対の第２油圧ポンプ（２６）及び第２油圧モータ（２７）を備えて旋回用の油圧式無段変速機構を形成する旋回用ＨＳＴ（２８）とを備え、前記エンジン（２１）の出力軸（２１ａ）に第１及び第２油圧ポンプ（２３）（２６）の入力軸（２９ａ）（２９ｂ）を伝達ベルト（３０ａ）（３０ｂ）によって連結させ、前記各油圧ポンプ（２３）（２６）を駆動するように構成している。
【００１２】
また、前記第１油圧モータ（２４）の出力軸（３１）に、副変速機構（３２）及び差動機構（３３）を介して左右走行クローラ（２）の各駆動輪（３４）を連動連結させるもので、前記差動機構（３３）は左右対称の１対の遊星ギヤ機構（３５）を有し、各遊星ギヤ機構（３５）は１つのサンギヤ（３６）と、該サンギヤ（３６）の外周で噛合う３つのプラネタリギヤ（３７）と、これらプラネタリギヤ（３７）に噛合うリングギヤ（３８）などで形成している。
【００１３】
前記プラネタリギヤ（３７）はサンギヤ軸（３９）と同軸線上とのキャリヤ軸（４０）のキャリヤ（４１）にそれぞれ回転自在に軸支させ、左右のサンギヤ（３６）（３６）を挾んで左右のキャリヤ（４１）を対向配置させると共に、前記リングギヤ（３８）は各プラネタリギヤ（３７）に噛み合う内歯（３８ａ）を有してサンギヤ軸（３９）とは同一軸芯上に配置させ、キャリヤ軸（４０）に回転自在に軸支させ、キャリヤ軸（４０）を延設して車軸を形成して駆動輪（３４）を軸支させている。
【００１４】
また、直進用ＨＳＴ（２５）は、第１油圧ポンプ（２３）の回転斜板の角度変更調節により第１油圧モータ（２４）の正逆回転と回転数の制御を行うもので、第１油圧モータ（２４）の回転出力を出力軸（３１）の伝達ギヤ（４２）より各ギヤ（４３）（４４）（４５）及び副変速機構（３２）を介して、サンギヤ軸（３９）に固定したセンタギヤ（４６）に伝達してサンギヤ（３６）を回転するように構成している。前記副変速機構（３２）は、前記ギヤ（４４）を有する副変速軸（４７）と、前記ギヤ（４５）を介してセンタギヤ（４６）に噛合うギヤ（４８）を有する駐車ブレーキ軸（４９）とを備え、副変速軸（４７）とブレーキ軸（４９）間に各１対の低速用ギヤ（５０）（５１）・中速用ギヤ（５２）（５３）・高速用ギヤ（５４）（４８）を設けて、低中速スライダ（５５）及び高速スライダ（５６）のスライド操作によって副変速の低速・中速・高速の切換を行うように構成している。なお低速・中速間及び中速・高速間には中立を有する。また前記ブレーキ軸（４９）に駐車ブレーキ（５７）を設けると共に、刈取部（８）に回転力を伝達する刈取ＰＴＯ軸（５８）にギヤ（５９）（６０）及び一方向クラッチ（６１）を介して副変速軸（４７）を連結させ、刈取部（８）を車速同調速度で駆動している。
【００１５】
上記のように、前記センタギヤ（４６）を介しサンギヤ軸（３９）に伝達された第１油圧モータ（２４）からの駆動力を、左右の遊星ギヤ機構（３５）を介して左右キャリヤ軸（４０）に伝達させると共に、左右キャリヤ軸（４０）に伝達された回転を左右の駆動輪（３４）にそれぞれ伝え、左右走行クローラ（２）を駆動するように構成している。
【００１６】
さらに、旋回用ＨＳＴ（２８）は、第２油圧ポンプ（２６）の回転斜板の角度変更調節により第２油圧モータ（２７）の正逆回転と回転数の制御を行うもので、操向出力ブレーキ（６２）を有するブレーキ軸（６３）と、操向出力クラッチ（６４）を有するクラッチ軸（６５）と、前記の左右リングギヤ（３８）の外歯（３８ｂ）に常時噛合させる左右入力ギヤ（６６）（６７）を設け、第２油圧モータ（２７）の出力軸（６８）に前記ブレーキ軸（６３）及び操向出力クラッチ（６４）を介してクラッチ軸（６５）を連結させ、クラッチ軸（６５）に正転ギヤ（６９）を介して右入力ギヤ（６７）を連結させ、またクラッチ軸（６５）に正転ギヤ（６９）及び逆転ギヤ（７０）を介して左入力ギヤ（６６）を連結させている。そして、副変速スライダ（５５）（５６）の中立によって前記ブレーキ（６２）を入にしかつクラッチ（６４）を切にする一方、前記中立以外の副変速出力時にブレーキ（６２）を切にしかつクラッチ（６４）を入にし、右側のリングギヤ（３８）の外歯（３８ｂ）に正転ギヤ（６９）を介してモータ（２７）回転を伝え、また左側のリングギヤ（３８）の外歯（３８ｂ）に正転ギヤ（６９）及び逆転ギヤ（７０）を介してモータ（２７）回転を伝え、第２油圧モータ（２７）を正転（逆転）時、左右同一回転数で、左リングギヤ（３８）を逆転（正転）させ、かつ右リングギヤ（３８）を正転（逆転）とさせるように構成している。
【００１７】
而して、旋回用の第２油圧モータ（２７）を停止させて左右リングギヤ（３８）を静止固定させた状態で、直進用の第１油圧モータ（２４）を駆動すると、第１油圧モータ（２４）からの回転出力はセンタギヤ（４６）から左右のサンギヤ（３６）に同一回転数で伝達され、左右遊星ギヤ機構（３５）のプラネタリギヤ（３７）・キャリヤ（４１）を介して左右の走行クローラ（２）が左右同一回転方向で同一回転数によって駆動され、機体の前後方向直進走行が行われる。一方、直進用の第１油圧モータ（２４）を停止させて左右のサンギヤ（３６）を静止固定させた状態で、旋回用の第２油圧モータ（２７）を正逆回転駆動すると、左側の遊星ギヤ機構（３５）が正或いは逆回転、また右側の遊星ギヤ機構（３５）が逆或いは正回転し、左右走行クローラ（２）を逆方向に駆動し、機体を左或いは右に旋回させる。また、直進用の第１油圧モータ（２４）を駆動させながら、旋回用の第２油圧モータ（２７）を駆動することにより、機体が左右に旋回して進路が修正されるもので、機体の旋回半径は第２油圧モータ（２７）の出力回転数によって決定される。
【００１８】
さらに、図１、図２及び図４乃至図７及び図１５乃至図２６に示す如く、前記運転台（１８）の前部上面にステアリングコラム（７１）を立設固定させ、ステアリングコラム（７１）上面上方側に操向ハンドル（１９）を縦軸回りに回転自在に設けると共に、運転台（１８）左側にサイドコラム（７２）を設け、サイドコラム（７２）下方にミッション（２２）を配設させ、主変速レバー（７３）、副変速レバー（７４）、刈取クラッチレバー（７５）、脱穀クラッチレバー（７６）などを前記サイドコラム（７２）に設ける。また前記ステアリングコラム（７１）は、アルミニウム合金鋳物を成形加工して形成し、左右に分割自在な２つ割れ構造で複数のボルト（７７）で締結して箱形に形成している。
【００１９】
また、前記ステアリングコラム（７１）上部にチルト台（７８）を一体形成し、チルト台（７８）に支点ボルト（７９）を介してチルトブラケット（８０）を回転自在に軸支させ、チルトレバー（８１）によってチルトブラケット（８０）を角度調節自在に固定させる。前記チルトブラケット（８０）に軸ケース（８２）下部を一体固定させ、コラム（７１）上面に固定させる上面カバー（８３）上方に軸ケース（８２）を延設させ、軸ケース（８２）内部に上ハンドル軸（８４）を回転自在に軸支させ、上ハンドル軸（８４）上端に操向ハンドル（１９）を固定させ、チルトレバー（８１）操作により支点ボルト（７９）回りにハンドル（１９）を前後方向に移動調節して一定位置に支持させ、ハンドル（１９）取付け位置を前後方向に調節して作業者が操作し易い位置に固定させる。
【００２０】
また、前記上ハンドル軸（８４）の下端部に自在継手（８５）を介して下ハンドル軸（８６）上端側を連結させ、下ハンドル軸（８６）をステアリングコラム（７１）上部に回転自在に軸支させると共に、ステアリングコラム（７１）上部に操向入力軸（８７）上端部を回転自在に軸支させ、下ハンドル軸（８６）のギヤ（８８）と操向入力軸（８７）のセクタギヤ（８９）を噛合させて各軸（８６）（８７）を連結させ、ステアリングコラム（７１）内部の略中央で上下方向に操向入力軸（８７）を延設させる。
【００２１】
さらに、前記ステアリングコラム（７１）の左側面で上下幅略中間に軸受部（９０）を一体形成し、変速入力軸（９１）の一端部を軸受部（９０）にボルト（９２）を介して回転自在に片持ち支持させ、変速入力軸（９１）を左右方向に略水平に軸支させると共に、操向入力軸（８７）下端に自在継手（９３）を介して入力支点軸（９４）上端側を連結させ、入力支点軸（９４）下端側を前記変速入力軸（９１）に回転自在に軸支させる。また前記入力支点軸（９４）上端側に操向入力部材（９５）を固定させ、変速入力軸（９１）上面と操向入力部材（９５）下面の間に変速入力部材（９６）を挾持させ、入力支点軸（９４）回りに変速入力部材（９６）を回転自在に取付けると共に、変速入力部材（９６）に着脱自在に固定させる連係ボルト（９７）によって前記各入力部材（９５）（９６）を連結させ、また変速入力軸（９１）に設ける挾みバネ（９８）の両端を変速入力部材（９６）に係止させ、変速入力部材（９６）を前記バネ（９８）によって直進中立位置に支持させる。また、前記操向入力軸（８７）の正逆転によって前記各入力部材（９５）（９６）をバネ（９８）に抗して略垂直な入力軸（８７）芯線回りに正逆転させると共に、前記変速入力軸（９１）の正逆転によって略水平な左右方向の入力軸（９１）芯線回りに入力支点軸（９４）及び前記各入力部材（９５）（９６）を前後方向に傾動させるもので、垂直方向の操向入力軸（８７）芯線と左右水平方向の変速入力軸（９１）芯線とが直角交叉する交点に自在継手（９３）を取付け、操向ハンドル（１９）の操向入力軸（８７）正逆転操作により操向入力軸（８７）芯線回りに前記各入力部材（９５）（９６）を正逆転させる。
【００２２】
さらに、前記ステアリングコラム（７１）の下部前側にサイドコラム（７２）からの主変速操作入力部である主変速軸（９９）を回転自在に軸支させ、左右方向に略水平に横架させる主変速軸（９９）の左側端をステアリングコラム（７１）の前下部側に突設させる一方、サイドコラム（７２）内部のレバー支点軸（１０５）に回転自在に支点板（１０６）を取付け、支点板（１０６）に筒軸（１０７）を介して主変速レバー（７３）基部を左右方向に揺動自在に取付け、長さ調節自在な主変速操作伝達部材であるターンバックル（１０３）付き長さ調節自在ロッド（１０４）及びリンク（１０１）を介しサイドコラム（７２）内部で支点板（１０６）を主変速軸（９９）に連結させ、主変速レバー（７３）をレバー支点軸（１０５）回りに前後方向に揺動させる変速操作によって主変速軸（９９）を正逆転させる。また、ロッド形主変速部材（１１０）及び上下リンク（１１１）（１１２）を介して変速入力軸（９１）に主変速軸（９９）を連結させ、主変速レバー（７３）の主変速軸（９９）正逆転操作により前記各入力部材（９５）（９６）を変速入力軸（９１）芯線回りに前後に傾動させる。
【００２３】
さらに、筒軸形の操向出力軸（１１３）を前記主変速軸（９９）に回転自在に取付け、リンク形操向出力部材（１１４）を操向出力軸（１１３）に固定させると共に、ロッド形操向結合部材（１１５）の上端部を前記操向入力部材（９５）に自在継手形操向入力連結部（１１６）を介して連結させ、球関継手形操向出力連結部（１１７）を介して操向結合部材（１１５）の下端部を操向出力部材（１１４）に連結させ、走行進路を変更させる操向機構（１１８）を構成している。
【００２４】
さらに、前記操向出力軸（１１３）の上方で該軸（１１３）と略平行に変速出力軸（１１９）をステアリングコラム（７１）内部に回転自在に軸支させ、リンク形変速出力部材（１２０）を変速出力軸（１１９）に固定させると共に、ロッド形変速結合部材（１２１）の上端部を前記変速入力部材（９６）に自在継手形変速入力連結部（１２２）を介して連結させ、球関継手形変速出力連結部（１２３）を介して変速結合部材（１２１）の下端部を変速出力部材（１２０）に連結させ、走行速度の変更並びに前後進の切換を行う変速機構（１２４）を構成している。
【００２５】
さらに、互に回転自在な二重軸構造の外側の変速操作軸（１２５）並びに内側の操向操作軸（１２６）をステアリングコラム（７１）の下部後側で左右幅中央の軸受部（１２７）に回転自在に取付けるもので、長さ調節自在な球関継手軸（１２８）及び変速リンク（１２９）（１３０）を介して前記変速出力軸（１１９）に変速操作軸（１２５）上端部を連結させると共に、長さ調節自在な球関継手軸（１３１）及び操向リンク（１３２）（１３３）を介して前記操向出力軸（１１３）に操向操作軸（１２６）上端部を連結させる。
【００２６】
また、前記各操作軸（１２５）（１２６）は同一軸芯上に略垂直にステアリングコラム（７１）底部に突設させ、各操作軸（１２５）（１２６）上端部をステアリングコラム（７１）内部に延設させて各出力軸（１１３）（１１９）に連結させると共に、ステアリングコラム（７１）底面下方に各操作軸（１２５）（１２６）下端部を突設させ、前記運転台（１８）の作業者搭乗用のステップ板（１３４）下面側に各操作軸（１２５）（１２６）下端側を延設させるもので、前記直進用ＨＳＴ（２５）の主変速操作入力部である第１トラニオン（１３５）にトラニオンアーム（１３６）を固定させ、ステアリングコラム（７１）と直進用ＨＳＴ（２５）との間の長さ調節自在な主変速操作伝達部材であるターンバックル（１３７）付き長さ調節自在ロッド（１３８）及びリンク（１３９）を介してステアリングコラム（７１）の主変速操作出力部である前記変速操作軸（１２５）下端部にトラニオンアーム（１３６）を連結させ、第１トラニオン（１３５）の正逆転操作により第１油圧ポンプ（２３）の斜板角調節を行って第１油圧モータ（２４）の回転数制御及び正逆転切換を行い、走行速度（車速）の無段階変更並びに前後進の切換を行う。また前記旋回用ＨＳＴ（２８）の操向操作入力部である第２トラニオン（１４０）にトラニオンアーム（１４１）を固定させ、ステアリングコラム（７１）と旋回用ＨＳＴ（２８）との間の長さ調節自在な操向操作伝達部材であるターンバックル（１４２）付き長さ調節自在ロッド（１４３）及びリンク（１４４）を介してステアリングコラム（７１）の操向操作出力部である操向操作軸（１２６）下端部にトラニオンアーム（１４１）を連結させ、第２トラニオン（１４０）の正逆転操作により第２油圧ポンプ（２６）の斜板角調節を行って第２油圧モータ（２７）の回転数制御及び正逆転切換を行い、操向角度（旋回半径）の無段階変更並びに左右旋回方向の切替を行う。
【００２７】
さらに、前記ステアリングコラム（７１）の右側外面にアクセルレバー（１４５）を前後方向回転自在に設け、エンジン（２１）にアクセルレバー（１４５）を連結させるアクセルワイヤ（１４６）をステアリングコラム（７１）前面内側に沿わせて下方から延出させ、アクセルレバー（１４５）によってエンジン（２１）回転数を手動調節すると共に、前記ステアリングコラム（７１）後面にメンテナンス窓（１４７）を開設させ、着脱自在な蓋（１４８）によってメンテナンス窓（１４７）を閉鎖している。
【００２８】
さらに、図８、図９に示す如く、前記連係ボルト（９７）を遊嵌挿通させる位相調節孔（１４９）を操向入力部材（９５）に開設させると共に、操向入力軸（８７）芯線を中心とする同一放射線上に複数（３個）のネジ孔（１５０）を設け、前記放射線を中心に操向入力軸（８７）側を底辺とする台形に前記位相調節孔（１４９）を形成するもので、直進位置の操向ハンドル（１９）を左右回転操作したとき、前記ネジ孔（１５０）に固定させた連係ボルト（９７）が位相調節孔（１４９）縁に当接するまで、変速入力部材（９６）を挾みバネ（９８）によって一定位置に固定させた状態で、操向入力部材（９５）だけを回転させ、走行速度を略一定に保ち乍ら左右に旋回させて進路を修正する。そして、連係ボルト（９７）が位相調節孔（１４９）縁に当接したとき、操向ハンドル（１９）をさらに同一方向に回転操作することにより、連係ボルト（９７）の連結によって操向入力部材（９５）と変速入力部材（９６）の両方がバネ（９８）に抗して回転し、走行速度を減速させ乍ら進路修正を行うもので、操向ハンドル（１９）操作によって決定される旋回半径と走行速度の減速量が比例して変化すると共に、操向ハンドル（１９）を直進位置に戻すことにより、挾みバネ（９８）によって変速入力部材（９６）が中立位置に戻され、元の走行速度に自動的に復帰する。また、連係ボルト（９７）を各ネジ孔（１５０）に付け換えることにより、位相調節孔（１４９）縁に連係ボルト（９７）が当接するまでの操向入力部材（９５）の回転角度が変化し、操向ハンドル（１９）操作による走行速度の減速開始時期を調整できると共に、操向ハンドル（１９）を直進支持しているとき、挾みバネ（９８）によって変速入力部材（９６）が変速入力軸（９１）に固定され、機械振動などによって変速入力部材（９６）が遊動するのを防ぎ、変速入力部材（９６）のふらつきによって走行速度が減速変化するのを阻止している。
【００２９】
さらに、図１０乃至図１４に示す如く、前記ギヤ（８８）は、２７０度の外周範囲に複数の歯（１５１）を形成し、９０度の外周範囲を円弧（１５２）に形成し、操向ハンドル（１９）の全回転角度を２７０度とし、左操向回転または右操向回転の角度を１３５度に設定し、操向ハンドル（１９）回転操作を片手で作業者が容易に行えるように形成する。また、前記セクタギヤ（８９）は、１３０度の外周範囲に複数の歯（１５３）を形成し、２３０度の外周範囲を円弧カム（１５４）に形成し、前記ギヤ（８８）の歯（１５１）とセクタギヤ（８９）の歯（１５３）を噛合せ、各ギヤ（８８）（８９）の最大正逆転時、前記円弧（１５２）両端のストッパ（１５５）と前記円弧カム（１５４）両端のストッパ（１５６）を当接させ、操向ハンドル（１９）の回転を規制すると共に、操向入力軸（８７）芯線回りに操向入力部材（９５）及び変速入力部材（９６）を６５度の範囲で正転または逆転させ、各入力部材（９５）が回転移動する平面上に変速入力軸（９１）及び主変速部材（１１０）上端部を配置させる空間を確保し、変速入力軸（９１）芯線上に操向入力連結部（１１６）を設ける構造、並びに同一円周上で前記各入力連結部（１１６）（１２２）を９０度離間させる構造を容易に得られ、構造のコンパクト化、設計組立の簡略化などを図れるように構成している。
【００３０】
また、前記セクタギヤ（８９）の円弧カム（１５４）中央に直進ノッチ（１５７）を形成すると共に、前記ステアリングコラム（７１）上面壁にデテント軸（１５８）を回転自在に軸支させ、デテント軸（１５８）下端部にデテントアーム（１５９）を固定させ、デテントアーム（１５９）にローラ軸（１６０）を介してデテントローラ（１６１）を回転自在に軸支させ、前記円弧カム（１５４）にデテントローラ（１６１）を当接させ、直進ノッチ（１５７）に係脱自在にデテントローラ（１６１）を係合させ、操向ハンドル（１９）を直進位置に支持させる。また、前記デテント軸（１５８）上端側にデテントレバー（１６２）を固定させ、デテント軸（１５８）に巻装させる中立バネ（１６３）の一端をデテントレバー（１６２）に係止させ、ステアリングコラム（７１）の受板（１６４）に中立バネ（１６３）の他端を当接させ、円弧カム（１５４）及び直進ノッチ（１５７）にデテントローラ（１６１）を中立バネ（１６３）によって弾圧当接させている。また、操向ハンドル（１９）の直進位置をオンオフ切換によって電気的に検出するマイクロスイッチ型直進センサ（１６５）をデテントレバー（１６２）に取付けている。
【００３１】
そして、前記主変速レバー（７３）が中立のとき、操向ハンドル（１９）の正転（逆転）操作により、操向入力軸（８７）芯線回りに前記各入力部材（９５）（９６）及び各結合部材（１１５）（１２１）が円錐軌跡上で移動し、前記各出力部材（１１４）（１２０）及び各出力軸（１１３）（１１９）が停止した状態が維持される。
【００３２】
また、主変速レバー（７３）を前方（後方）に倒す前進（後進）操作により、前記各入力部材（９５）（９６）が変速入力軸（９１）芯線回りに前方（後方）に傾き、操向入力連結部（１１６）が一定位置に停止した状態を維持し乍ら、変速入力連結部（１２２）を上方（下方）に移動させ、変速出力部材（１２０）の上方（下方）揺動によって変速出力軸（１１９）を正転（逆転）させ、直進用ＨＳＴ（２５）の第１油圧ポンプ（２３）の斜板角切換によって第１油圧モータ（２４）を正転（逆転）させ、第１油圧モータ（２４）の出力軸（３１）の正転（逆転）によって左右走行クローラ（２）を前進（後進）駆動する。また、主変速レバー（７３）の倒し角に比例して出力軸（３１）の回転数が変化し、走行クローラ（２）の前進（後進）速度が無段階に変速される。
【００３３】
さらに、主変速レバー（７３）を前方（後方）に倒して前進（後進）操作を行っている状態下で、操向ハンドル（１９）を左方向（右方向）に回転させることにより、変速入力軸（９１）芯線回りに操向入力部材（９５）が前方（後方）に傾いた姿勢で操向入力軸（８７）芯線回りに正転（逆転）し、操向入力連結部（１１６）が下方（上方）に移動し、操向出力部材（１１４）の下方（上方）揺動によって操向出力軸（１１３）を正転（逆転）させ、旋回用ＨＳＴ（２８）の第２油圧ポンプ（２６）の斜板角切換によって第２油圧モータ（２７）を正転（逆転）させ、第２油圧モータ（２７）の出力軸（６８）の正転（逆転）により、左走行クローラ（２）を減速（増速）させ、かつ右走行クローラ（２）を増速（減速）させ、左方向（右方向）に機体を旋回させて左方向（右方向）に進路を修正する。また、前記の進路修正動作と同時に、操向ハンドル（１９）の左方向（右方向）回転により、変速入力軸（９１）芯線回りに変速入力部材（９６）が前方（後方）に傾いた状態で操向入力軸（８７）芯線回りに正転（逆転）し、変速入力連結部（１２２）が下方（上方）に移動し、変速出力部材（１２０）の下方（上方）揺動によって変速出力軸（１１９）を逆転（正転）させ、直進用ＨＳＴ（２５）を中立方向に戻す制御を行って出力軸（３１）の回転数を低下させ、走行速度（車速）を減速させる。このように、走行移動中の操向ハンドル（１９）の左右操向操作により、操向ハンドル（１９）の回転角度に比例して、進路を修正する旋回半径（角度）と、走行速度の減速量が変化し、操向ハンドル（１９）を大きく回転させることによって左右走行クローラ（２）の速度差を大きくして旋回半径を小さくすると同時に、走行速度の減速量が多くなって車速が遅くなると共に、前進時と後進時とでは、操向ハンドル（１９）の回転に対して旋回入力連結部（１１６）の動きを逆方向にし、前後進の何れにおいても操向ハンドル（１９）の回動操作方向と機体の旋回方向とを一致させ、回転操作する丸形の操向ハンドル（１９）の回転操作によって例えばトラクタまたは田植機など四輪自動車と同様の運転感覚で進路修正及び方向転換などを行う。
【００３４】
さらに、図１３、図１４は機体の左右旋回時における操向ハンドル（１９）の切れ角と左右走行クローラ（２）の速度の関係を示すもので、ハンドル（１９）の切れ角が大となる程左右走行クローラ（２）の速度差は大となると共に、左右走行クローラ（２）の平均速度となる機体中心速度も走行速度（高速・標準・低速）状態に応じて減速される。直進位置の操向ハンドル（１９）を左方向（右方向）に約１５度回転させると、前記位相調節孔（１４９）内を連係ボルト（９７）が移動し、挾みバネ（９８）によって変速入力部材（９６）が直進と同一位置に維持されると共に、旋回用ＨＳＴ（２８）の第２油圧ポンプ（２６）によって第２油圧モータ（２７）を正転（逆転）させる操向出力によって左方向（右方向）に旋回させ、未刈り穀稈（作物）列の湾曲に合せる進路修正を行う。このとき、旋回内側の走行クローラ（２）の減速量と、旋回外側の走行クローラ（２）の増速量が略等しくなり、機体中心速度が直進と略同一速度に保たれる。また、操向ハンドル（１９）を直進位置から１５度以上回転させると、挾みバネ（９８）に抗して変速入力部材（９６）が左旋回及び右旋回のいずれでも減速動作し、第１油圧ポンプ（２３）及びモータ（２４）の走行変速出力を減速させ、左右走行クローラ（２）を同一方向に回転駆動させて前進（または後進）させ、左右走行クローラ（２）の走行速度差により左方向（右方向）に旋回するブレーキターン動作を行わせ、未刈り穀稈（作物）列から外れたときに元の列に戻したり隣の列に移動させる進路修正を行う。さらに、操向ハンドル（１９）を約１３５度回転させると、機体中心速度が直進時の約４分の１に減速され、旋回内側の走行クローラ（２）が逆転駆動され、旋回内側の走行クローラ（２）を中心として機体が旋回するスピンターン動作が行われ、左右走行クローラ（２）の左右幅だけ旋回方向にずらせて機体を１８０度方向転換させるもので、ハンドル角度０度からハンドル角度１３５度の範囲で操向ハンドル（１９）を回転させて左または右方向の旋回操作を行い、直進位置を中心とした左右１５度のハンドル（１９）回転範囲で未刈り穀稈（作物）列に沿って移動する条合せ進路修正を、直進時の走行速度を維持し乍ら行うと共に、直進位置から左右１３５度のハンドル（１９）回転により、圃場枕地で機体を方向転換させて次作業工程に移動させるスピンターン動作を、直進時の約４分の１の走行速度に自動的に減速して行う。
【００３５】
さらに、副変速を標準（秒速１．５メートル）速度に保ち、操向ハンドル（１９）を９０度回転させたとき、主変速レバー（７３）操作により主変速出力を高速及び３分の２及び３分の１に変更しても、機体の旋回半径が略一定に保たれた状態で、旋回速度（機体中心速度）だけを変化させる。また、直進位置を基準として連係ボルト（９７）と位相調節孔（１４９）の設定範囲で第１油圧ポンプ（２３）第１油圧モータ（２４）を直進状態に維持させ、農作業中に作物列または畦などに機体を沿わせる操向操作を行っても走行速度が不均一に変化するのを防止し、略同一走行速度を保ち乍ら農作業中の進路修正を行え、作業者の運転感覚と機体の走行動作とを略一致させて適正な操向操作を行える。また、主変速レバー（７３）の変速基準値を切換える副変速レバー（７４）副変速操作の低速及び標準及び高速切換に比例させて旋回半径を小径乃至大径に変化させ、第１油圧ポンプ（２３）及びモータ（２４）と走行クローラ（２）間の減速比並びに第２油圧ポンプ（２６）及びモータ（２７）と走行クローラ（２）間の減速比の設定、或いはスピンターン動作に必要な小半径旋回に必要な走行駆動力の確保などを図ると共に、同一副変速操作位置で主変速レバー（７３）を操作することによって旋回半径を略一定に保った状態で旋回時の走行速度を変化させ、作業者の熟練度などに応じた運転操作を行え、機動性の向上並びに運転操作性の向上などを図る。
【００３６】
上記のように、エンジン（２１）の駆動力を左右走行クローラ（２）に伝える差動機構（３３）と、左右走行クローラ（２）の駆動速度を無段階に変更させる直進用ＨＳＴ（２５）と、左右走行クローラ（２）の駆動速度の差を無段階に変化させる旋回用ＨＳＴ（２８）を設ける移動農機において、操向操作具（１９）によって回転させる操向入力軸（８７）と、変速操作具（７３）によって回転させる変速入力軸（９１）と、変速入力軸（９１）を変速部材（２５）に連結させる変速機構（１２４）と、操向入力軸（８７）を操向部材（２８）に連結させる操向機構（１１８）を設け、変速機構（１２４）動作量に比例させて操向機構（１１８）操向量を変化させるように構成し、要するに、運転席（２０）前方のステアリングコラム（７１）に旋回用ＨＳＴ（２８）への操向操作出力部（１２６）と共に運転席（２０）側方のサイドコラム（７２）からの主変速操作入力部（９９）及び直進用ＨＳＴ（２５）への主変速操作出力部（１２５）を設け、主変速操作を直接直進用ＨＳＴ（２５）に伝えるのではなく、一旦ステアリングコラム（７１）に入力して直進用ＨＳＴ（２５）に伝えるようにし、ステアリングコラム（７１）の内部機構によって入力された主変速操作量に比例させて操向操作量を変化させ、その操向操作を旋回用ＨＳＴ（２８）に伝えることによって、高速側走行変速によって操向量を自動的に拡大し、かつ低速側走行変速によって操向量を自動的に縮少し、操向ハンドル（１９）の一定量の操作によって走行速度に関係なく左右走行クローラ（２）の旋回半径を略一定に維持し、農作業走行速度の変更並びに作物列などに機体を沿わせる進路修正などを容易に行うように構成している。
【００３７】
ところで図３及び図１５乃至図２６に示す如く、左右走行クローラ（２）の左右駆動輪（３４）を支持する車軸ケース（１６６）の略中央で前記サイドコラム（７２）下方位置にミッション（２２）を、また該ミッション（２２）の後方にエンジン（２１）をそれぞれ配設させ、ミッション（２２）上部の前側に旋回用ＨＳＴ（２８）を、後側に直進用ＨＳＴ（２５）を一体的に固設して、ミッション（２２）を構成する直進用ＨＳＴ（２５）の左外側に突出させる第１油圧ポンプ（２３）の駆動軸（２９ａ）左端を前記エンジン（２１）左側のエンジン出力軸（２１ａ）にプーリ（１６７）（１６８）及びベルト（３０ａ）及びテンションプーリ（１６９）を介して連動連結させると共に、前記直進用ＨＳＴ（２５）内を左右に挿通させる駆動軸（２９ａ）の右端を、前記旋回用ＨＳＴ（２８）の右外側に突出させる第２油圧ポンプの駆動軸（２９ｂ）にプーリ（１７０）（１７１）及びベルト（３０ｂ）及びテンションプーリ（１７２）を介して連動連結させて、直進用ＨＳＴ（２５）の駆動系（１７３）を左側に、また旋回用ＨＳＴ（２８）の駆動系（１７４）を右側に配設し、旋回より走行を優先させた駆動を行うように構成している。
【００３８】
また、前記直進用ＨＳＴ（２５）下方でミッション（２２）の左外側に突出させる刈取ＰＴＯ軸（５８）の刈取出力プーリ（１７５）に、直進用ＨＳＴ（２５）後側上方に配設させる刈取入力軸（１７６）の刈取入力部である刈取入力プーリ（１７７）を伝達系であるベルト（１７８）及びテンションプーリ式刈取クラッチ（１７９）を介し連動連結させて、刈取部（８）への動力伝達を行うと共に、エンジン（２１）の後方に配設させる脱穀入力軸（１８０）にプーリ（１８１）（１８２）及びベルト（１８３）及びテンションプーリ式脱穀クラッチ（１８４）を介して前記エンジン出力軸（２１ａ）を連動連結させて、脱穀部（４）への動力伝達を行うように構成している。
【００３９】
そして、直進及び旋回用のトラニオンアーム（１３６）（１４１）基端のボス部（１３６ａ）（１４１ａ）を軸体であるトラニオン（１３５）（１４０）にボルト（１８５）を介し取外し自在に固定させて、ロッド（１３８）（１４３）との連結の容易化やメンテナンス性の向上を図ると共に、直進用のトラニオンアーム（１３６）とロッド（１３８）とは軸（１８６）及び長孔（１８７）を介して中立域で若干の融通を有して連結させ、旋回用のトラニオンアーム（１４１）とロッド（１４３）とは軸（１８８）を介して連結させ、また各ＨＳＴ（２５）（２８）の中立位置設定用のセンター出しセット機構（１９８）（１９９）を各ＨＳＴ（２５）（２８）の上面に設けるもので、この各センター出しセット機構（１９８）（１９９）は、各トラニオンアーム（１３６）（１４１）のボス部（１３６ａ）（１４１ａ）に中立保持用デテント板（１８９）を一体連結させると共に、各油圧ポンプ（２３）（２６）外壁に固定するデテント軸（１９０）にデテントアーム（１９１）を回動自在に枢支させ、該デテントアーム（１９１）に軸支するデテントローラ（１９２）をバネ（１９３）力で前記デテント板（１８９）の凹部中立ノッチ（１８９ａ）に弾圧当接させ、各トラニオンアーム（１３６）（１４１）の中立位置を保持させるように構成している。
【００４０】
図１，図２及び図１５乃至図２６に示す如く、操向ハンドル（１９）を設ける胴長のステアリングコラム（７１）は、運転台（１８）の下側に延設されたシャーシフレーム（３）に下端部を固定支持するもので、そのステアリングコラム（７１）と運転席（２０）との間の運転台（１８）上面とステアリングコラム（７１）下部の左右両側にステップ板（１３４）を張設し、ステアリングコラム（７１）の左右両側に作業者の両足を入れて載せることによって、運転台（１８）の前後長を縮小し、機体の全長を縮小するように構成している。
【００４１】
さらに、ステアリングコラム（７１）の左側のステップ板（１３４）の横幅を右側のステップ板（１３４）の横幅より幅広に形成し、ステアリングコラム（７１）とサイドコラム（７２）との間に作業者の左足を入れて載せる充分なスペースを確保すると共に、ステアリングコラム（７１）左右側のステップ板（１３４）前部を傾斜状に立上げ形成している。
【００４２】
また、ステップ板（１３４）は、ステアリングコラム（７１）左右側の前部左及び右ステップ部と、ステアリングコラム（７１）より後部のステップ本体とに分割形成し、前部左及び右ステップ部をシャーシフレーム（３）に常時固定とし、ステップ本体をシャーシフレーム（３）に対し着脱自在に取付けることによって、ステップ板（１３４）下面側の構造のメンテナンスなどをステップ本体を取外すだけで簡単に行えるので好ましい。
【００４３】
前記運転台（１８）の下側に燃料タンク（２００）を配設し、シャーシフレーム（３）に燃料タンク（２００）を固定支持させ、ステアリングコラム（７１）と燃料タンク（２００）との間にステアリングコラム（７１）から前記変速操作軸（１２５）及び操向操作軸（１２６）を突出させ、前記ロッド（１３８）（１４３）をステップ板（１３４）と燃料タンク（２００）との間を通して各操作軸（１２５）（１２６）に連結することによって、変速操作軸（１２５）及び操向操作軸（１２６）及びロッド（１３８）（１４３）への泥及び塵埃の付着を燃料タンク（２００）で防止し、主変速操作及び操向操作の伝達精度を下げる要因を減らすように構成している。
【００４４】
また、前記ロッド（１３８）（１４３）の長さ調節はトラニオンアーム（１３６）（１４１）の中立位置及び直進用のトラニオンアーム（１３６）とロッド（１３８）との遊び、即ち長孔（１８７）内での軸（１８６）位置を確認しながら行うもので、直進用ＨＳＴ（２５）と旋回用ＨＳＴ（２８）とをサイドコラム（７２）の下方に配設した構造において、前記ロッド（１３８）（１４３）の長さ調節部であるターンバックル（１３７）（１４２）をミッション（２２）部上側に設け、又は前記ロッド（１３８）（１４３）の長さ調節部であるターンバックル（１３７）（１４２）をミッション（２２）に搭載する各ＨＳＴ（２５）（２８）上側に設け、又は前記ロッド（１３８）（１４３）の長さ調節部であるターンバックル（１３７）（１４２）をサイドコラム（７２）内部に設け、又は前記ロッド（１３８）（１４３）の長さ調節部であるターンバックル（１３７）（１４２）をＨＳＴ（２５）（２８）側のロッド（１３８）（１４３）端部側に設け、ＨＳＴ（２５）（２８）のセンター出しセット機構（１９８）（１９９）の間近に前記ロッド（１３８）（１４３）の長さ調節部（１３７）（１４２）を配設し、前記ロッド（１３８）（１４３）の長さ調節部（１３７）（１４２）とセンター出しセット機構（１９８）（１９９）部及び直進用のトラニオンアーム（１３６）とロッド（１３８）との遊び部（１８６）（１８７）を同じ視界に入れることによって、前記ロッド（１３８）（１４３）の長さ調節を簡単に、且つ適正に行えるようにし、メンテナンス性を向上させると共に、直進及び旋回用の各トラニオン（１３５）（１４０）及び各トラニオンアーム（１３６）（１４１）及び各センター出しセット機構（１９８）（１９９）及び前記ロッド（１３８）（１４３）の長さ調節部及び前記ロッド（１３８）（１４３）への泥及び塵埃の付着をミッション（２２）及びミッション（２２）部の防塵カバーなどで防止し、主変速操作及び操向操作の伝達精度を下げる要因を減らすように構成している。
【００４５】
また、前記主変速軸（９９）を、ステップ板（１３４）前部の立上げによって形成されたステップ板（１３４）前部左側下面の余剰スペースにステアリングコラム（７１）から突出させ、機体のコンパクト化を図ると共に、前記主変速軸（９９）をステップ板（１３４）とシャーシフレーム（３）との間に設け、外部から加えられる衝撃などから主変速軸（９９）を保護し、また泥及び塵埃の付着も防止し、主変速操作の伝達精度を下げる要因を減らすように構成している。
【００４６】
サイドコラム（７２）は、主変速レバー（７３）、副変速レバー（７４）、刈取クラッチレバー（７５）、脱穀クラッチレバー（７６）のレバー溝及び各種スイッチ、表示ランプ、表示モータなどを設けるサイドパネル（７２ａ）と、サイドパネル（７２ａ）を上面側に固定支持し、且つ各レバー（７３）（７４）（７５）（７６）のレバー支点軸などを取付けるサイドコラム（７２）の支持フレーム構造（図示省略）と、サイドコラム（７２）の運転席（２０）側に張設する側壁（２０２）などで構成され、主変速操作部及び副変速操作部及び作業操作部を形成するもので、サイドコラム（７２）を運転台（１８）の左側に配設し、そしてこのサイドコラム（７２）の下方に、即ちサイドパネル（７２ａ）の下方に各ＨＳＴ（２５）（２８）を搭載する前記ミッション（２２）を配設している。
【００４７】
ステアリングコラム（７１）と運転席（２０）との間のサイドコラム（７２）の側壁（２０２ａ）は開閉自在に蓋板などで形成し、主変速操作系、操向操作系、副変速操作系、駐車ブレーキ操作系及び牽制機構などのサイドコラム内部機構及び各ＨＳＴ（２５）（２８）及びミッション（２２）及び各動力伝達系などのメンテナンスを運転台（１８）から簡単に行えるように構成している。
【００４８】
主変速レバー（７３）は前記のように、サイドコラム（７２）の支持フレーム構造に取付けたレバー支点軸（１０５）と、レバー支点軸（１０５）に回転自在に軸支させ、且つ、筒軸（１０７）を介して主変速レバー（７３）基部を左右方向に揺動自在に取付ける支点板（１０６）と、支点板（１０６）を主変速軸（９９）に連結させるリンク（１０１）及びサイドコラム（７２）の内部略中央部の支点板（１０６）からサイドコラム（７２）の前面下部の主変速軸（９９）左端部に向かって傾斜調節する長さ調節ターンバックル（１０３）付きロッド（１０４）とによって、主変速軸（９９）と連結され、主変速レバー（７３）の主変速操作が主変速軸（９９）に伝達入力されるもので、中介の軸及びリンクなどを用いることなく支点板（１０６）を主変速軸（９９）に直接連結することによって、サイドコラム（７２）からステアリングコラム（７１）への主変速操作の伝達距離を短縮し、主変速操作精度を上げると共に、構造の簡素化を図り、また前記ロッド（１３８）（１４３）の長さ調節部の直ぐ上にサイドコラム（７２）からステアリングコラム（７１）への主変速操作伝達部材を配設しないようにし、サイドコラム（７２）からステアリングコラム（７１）への主変速操作伝達部材が前記ロッド（１３８）（１４３）の長さ調節及び各ＨＳＴ（２５）（２８）のセンター出しなどの作業の邪魔になるのを防止するように構成している。なお、レバー支点軸（１０５）上に支点板（１０６）を挾持する摩擦板を設け、主変速レバー（７３）の操作位置決めを行う。またデテント力は支点軸（１０５）に螺着するナットの緩め締めでバネ力を調節して行う。
【００４９】
また、副変速操作入力部である副変速シフタ軸（２０７）を前記ミッション（２２）の前面側に設けるもので、主変速レバー（７３）のレバー支点軸（１０５）の後部でサイドコラム（７２）の支持フレーム構造に取付けたレバー支点軸（２０８）に、副変速レバー（７４）基部を回転自在に軸支し、その副変速のレバー支点部からミッション（２２）の前面側上方まで前方に延び副変速シフタ軸（２０７）に略垂直に垂下する副変速操作伝達経路によって、副変速レバー（７４）をレバー支点軸（２０８）回りに前後方向に揺動させる変速操作を副変速シフタ軸（２０７）に伝達し、副変速シフタ軸（２０７）を正逆転させ、副変速の切換を行うように構成している。
【００５０】
さらに、運転台（１８）に駐車ブレーキペダル（２１７）と駐車ブレーキレバー（２１８）とを備え、駐車ブレーキペダル（２１７）をステアリングコラム（７１）とサイドコラム（７２）との間のステップ板（１３４）上面側に配設し、駐車ブレーキレバー（２１８）を運転台（１８）の右側前部に配設するもので、ステップ板（１３４）の後左角部上面側にペダル支点軸（２１９）を機体左右方向に横架させ、シャーシフレーム（３）に固定支持する筒軸（２２０）に前記ペダル支点軸（２１９）を回転自在に取付け、サイドコラム（７２）の左外側のペダル支点軸（２１９）にペダルアーム（２２１）基部を係合軸支させ、ステップ板（１３４）の左端部でこの後部から前部に前記ペダルアーム（２２１）を延出し、ペダルアーム（２２１）先端に駐車ブレーキペダル（２１７）を固定させる。一方シャーシフレーム（３）に固定支持する筒軸（２２３）にレバー支点軸（２２２）を回転自在に取付け、レバー支点軸（２２２）に駐車ブレーキレバー（２１８）基部を係合軸支させる。
【００５１】
そして、前記ペダル支点軸（２１９）を側壁（２０２ａ）の後部下縁に形成した切欠き部（２２４）からサイドコラム（７２）内部に突入させ、サイドコラム（７２）内部のペダル支点軸（２１９）端部に駐車ブレーキ操作出力部である駐車ブレーキ支点板（２２５）を一体に取付けるもので、前記駐車ブレーキ支点板（２２５）にリターンバネ（２２８）力を付勢すると共に、前記ペダルアーム（２２１）と連動する駐車ブレーキ支点板（２２５）に操作ワイヤ（２２６）及びリンク（２２９）を介してレバー支点軸（２２２）を連結し、駐車ブレーキペダル（２１７）の踏込みによる駐車ブレーキ操作と駐車ブレーキレバー（２１８）の傾倒操作による駐車ブレーキ操作を前記駐車ブレーキ支点板（２２５）に伝達する。そして駐車ブレーキ操作入力部であるミッション（２２）左側面の駐車ブレーキシフタ（２３２）に操作ワイヤ（２３３）を介して前記駐車ブレーキ支点板（２２５）を連結させ、駐車ブレーキペダル（２１７）の踏込みによる駐車ブレーキ操作と駐車ブレーキレバー（２１８）の傾倒操作による駐車ブレーキ操作を前記駐車ブレーキ支点板（２２５）から駐車ブレーキシフタ（２３２）に伝達し、前記駐車ブレーキ（５７）を作動させるように構成している。
【００５２】
また、駐車ブレーキ（５７）をかけた時、主変速レバー（７３）を中立位置に保持（既に中立位置のとき）又は復帰保持（中立以外の位置にあるとき）させる牽制機構（２３４）を設けるもので、牽制機構（２３４）は、牽制ローラ（２３５）と、牽制ローラ（２３５）を嵌合する溝孔（２３６）を有する牽制板（２３７）とで構成し、牽制ローラ（２３５）を主変速操作系の筒軸（１０７）に取付ける一方、主変速レバー（７３）のレバー支点軸（１０５）の後部でサイドコラム（７２）の支持フレーム構造に支点軸（２２９）を取付け、該支点軸（２２９）に回転自在に嵌合する筒軸（２３０）にリンク（２３１）を介して前記牽制板（２３７）を連結する。そして前記筒軸（２３０）にリンク（２３８）（２３９）を介して前記駐車ブレーキ支点板（２２５）を連結し、牽制板（２３７）を駐車ブレーキ操作系の駐車ブレーキ支点板（２２５）に連結させ、駐車ブレーキ（５７）をかけていない時は溝孔（２３６）の大形部（２３６ａ）内部に牽制ローラ（２３５）を位置させ、主変速操作を許す一方、駐車ブレーキ（５７）をかけた時、主変速が中立のときの牽制ローラ（２３５）位置に溝孔（２３６）の小形部（２３６ｂ）端部を移動させることによって、牽制ローラ（２３６）の中立位置からの移動を規制又は牽制ローラ（２３５）の中立位置への移動復帰後中立位置からの移動を規制し、駐停止時にサイドコラム（７２）の主変速レバー（７３）などの主変速操作部の誤操作を防止し、駐停止時に主変速操作部を確実に中立位置に保持し、誤った主変速操作がステアリングコラム（７１）に伝えられ、ステアリングコラム内部機構を破損させたり機体を走行させるのを防止するように構成している。
【００５３】
また、前記牽制機構（２３４）は、主変速レバー（７３）のレバー支点より上部に配設するもので、レバー支点軸（１０５）より上部の主変速操作系である筒軸（１０７）又は主変速レバー（７３）に牽制ローラ（２３５）を取付けると共に、牽制板（２３７）の下部に溝孔（２３６）の大形部（２３６ａ）を形成し、牽制板（２３７）の上部に溝孔（２３６）の小形部（２３６ｂ）を形成し、駐車ブレーキ（５７）をかけていない時、牽制板（２３７）をレバー支点軸（１０５）より上部に移動支持させて、溝孔（２３６）下部の大形部（２３６ａ）に牽制ローラ（２３５）を位置させ、駐車ブレーキ（５７）をかけた時、牽制板（２３７）を支点板（１０６）の一側に移動支持させて、溝孔（２３６）上部の小形部（２３６ｂ）に牽制ローラ（２３５）を位置させ、サイドコラム（７２）内部の主変速レバー（７３）のレバー支点より下部に空間を設け、前記各ロッド（１３８）（１４３）の長さ調節及び各ＨＳＴ（２５）（２８）のセンター出しなどを行うためのミッション（２２）の上部空間を、前記牽制機構（２３４）によって埋めてしまうのを防止し、前記牽制機構（２３４）が各ロッド（１３８）（１４３）の長さ調節及び各ＨＳＴ（２５）（２８）のセンター出しなどの作業の邪魔になるのを防止するように構成している。
【００５４】
【発明の効果】
以上実施例から明らかなように本発明は、運転席（２０）前方の丸ハンドル式のステアリングコラム（７１）に旋回用ＨＳＴ（２８）への操向操作出力部（１２６）と共に運転席（２０）側方のサイドコラム（７２）からの主変速操作入力部（９９）及び直進用ＨＳＴ（２５）への主変速操作出力部（１２５）を設けた移動農機において、前記各ＨＳＴ（２５）（２８）を搭載するミッション（２２）を前記サイドコラム（７２）の下方に配設し、ステアリングコラム（７１）の操向操作出力部（１２６）と旋回用ＨＳＴ（２８）との間で操向操作を伝達する長さ調節自在な操向操作伝達部材（１４３）と、ステアリングコラム（７１）の主変速操作出力部（１２５）と直進用ＨＳＴ（２５）との間で主変速操作を伝達する長さ調節自在な主変速操作伝達部材（１３８）とを設け、各伝達部材（１３８）（１４３）の長さ調節部（１３７）（１４２）をミッション（２２）部上側に配設することによって、ステアリングコラム（７１）とサイドコラム（７２）と旋回用ＨＳＴ（２８）及び直進用ＨＳＴ（２５）を搭載するミッション（２２）の三者を従来に比べ接近配置し、主変速操作及び操向操作の伝達距離の短縮を図り、これら操作の伝達精度を上げることができる、即ち主変速操作及び操向操作精度を上げることができる。また主変速操作及び操向操作の各操作系やその他サイドコラム内部機構に対する泥及び塵埃の付着をミッション（２２）及びミッション（２２）部の防塵カバーなどで防止し、主変速操作及び操向操作の伝達精度を下げる要因を減らすことができる。さらにステアリングコラム（７１）から旋回用ＨＳＴ（２８）及び直進用ＨＳＴ（２５）への操向操作伝達部材（１４３）及び主変速操作伝達部材（１３８）の長さ調節を、旋回用ＨＳＴ（２８）及び直進用ＨＳＴ（２５）の操向操作入力部（１４０）及び主変速操作入力部（１３５）の状態を目視確認しながら適正に行うことができ、主変速操作系及び操向操作系を適正に形成でき、且つメンテナンスも簡単に行うことができ、これらを常に適正状態に保つことができ、主変速操作及び操向操作の伝達精度を上げることができる、即ち主変速操作及び操向操作精度を上げることができる。
【００５５】
また、運転席（２０）前方の丸ハンドル式のステアリングコラム（７１）に旋回用ＨＳＴ（２８）への操向操作出力部（１２６）と共に運転席（２０）側方のサイドコラム（７２）からの主変速操作入力部（９９）及び直進用ＨＳＴ（２５）への主変速操作出力部（１２５）を設けた移動農機において、前記各ＨＳＴ（２５）（２８）を搭載するミッション（２２）を前記サイドコラム（７２）の下方に配設し、前記ミッション（２２）に設ける駐車ブレーキ（５７）をかけた時、サイドコラム（７２）の主変速レバー（７３）を中立位置に保持又は復帰保持させる牽制機構（２３４）を設けると共に、前記牽制機構（２３４）を主変速レバー支点より上部に配設することによって、駐停止時にサイドコラム（７２）の主変速レバー（７３）などの主変速操作部の誤操作を防止し、駐停止時に主変速操作部（７３）を確実に中立位置に保持し、誤った主変速操作がステアリングコラム（７１）に伝えられ、ステアリングコラム内部機構を破損させたり機体を走行させるのを防止することができる。またステアリングコラム（７１）から旋回用ＨＳＴ（２８）及び直進用ＨＳＴ（２５）への操向操作伝達部材（１４３）及び主変速操作伝達部材（１３８）の長さ調節を行うためのミッション（２２）の上部空間を、前記牽制機構（２３４）によって埋めてしまうのを防止でき、前記操向操作伝達部材（１４３）及び主変速操作伝達部材（１３８）の長さ調節を簡単に行うことができ、主変速操作系及び操向操作系を適正に形成でき、且つメンテナンスも簡単に行うことができ、これらを常に適正状態に保つことができ、主変速操作及び操向操作の伝達精度を上げることができる、即ち主変速操作及び操向操作精度を上げることができる。
【００５６】
また、サイドコラム（７２）の運転席（２０）側側壁（２０２ａ）又は／及び運転台（１８）のステップ板（１３４）を開閉自在に形成することによって、サイドコラム（７２）内部でミッション（２２）上側の主及び副変速操作系及び操向操作系及び駐車ブレーキ操作及び牽制機構（２３４）及びその他サイドコラム内部機構などのメンテナンスが運転席（２０）側から簡単に行うことができ、これらを常に適正状態に保つことができる。
【図面の簡単な説明】
【図１】コンバインの全体側面図
【図２】コンバインの全体平面図
【図３】ミッション駆動系の説明図
【図４】走行変速及び操向操作部の作動説明図
【図５】ステアリングコラムの側面図
【図６】ステアリングコラムの正面図
【図７】ステアリングコラムの平面説明図
【図８】ステアリングコラム横断面図
【図９】図８の分解説明図
【図１０】ステアリングコラム上部の部分平面図
【図１１】図１０の部分図
【図１２】図１１の作動説明図
【図１３】主変速と操向ハンドル操作を表わす線図
【図１４】副変速と操向ハンドル操作を表わす線図
【図１５】運転台の左側面図
【図１６】図１５の部分拡大図
【図１７】図１５の部分拡大図
【図１８】運転台の平面図
【図１９】図１８の部分拡大図
【図２０】運転台の正面図
【図２１】図２０の部分拡大図
【図２２】サイドコラム及びミッションの側面図
【図２３】図２２の部分拡大図
【図２４】図２２の部分拡大図
【図２５】牽制機構の側面図
【図２６】ミッションの平面図
【符号の説明】
（２）走行クローラ
（１８）運転台
（１９）操向ハンドル
（２０）運転席
（２１）エンジン
（２２）ミッション
（２３）第１油圧ポンプ
（２４）第１油圧モータ
（２５）直進用ＨＳＴ
（２６）第２油圧ポンプ
（２７）第２油圧モータ
（２８）旋回用ＨＳＴ
（５７）駐車ブレーキ
（７１）ステアリングコラム
（７２）サイドコラム
（７３）主変速レバー
（９９）主変速軸（主変速操作入力部）
（１２５）変速操作軸（主変速操作出力部）
（１２６）操向操作軸（操向操作出力部）
（１３５）第１トラニオン（主変速操作入力部）
（１３７）ターンバックル（長さ調節部）
（１３８）ロッド（主変速操作伝達部材）
（１４０）第２トラニオン
（１４２）ターンバックル（長さ調節部）
（１４３）ロッド（操向操作伝達部材）
（２０２）サイドコラム側壁
（２３４）牽制機構
（２１７）駐車ブレーキペダル
（２１８）駐車ブレーキレバー[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mobile agricultural machine such as a combine harvester that continuously harvests and thresh grain cereals in a field.
[0002]
[Prior art]
Conventionally, harvesting work is carried out while traveling along a row of uncut grain cereals in a field with a combine equipped with a left and right traveling crawler, and the combine is redirected at a field headland to change the direction of the next uncut grain. Although it was moved in a row, the left and right traveling output of the transmission case transmitting the engine output is transmitted to the left and right traveling crawlers via the left and right side clutches, and one of the left and right traveling crawlers is temporarily suspended by the intermittent operation of the left and right side clutches. When the vehicle is stopped and turned, it is necessary for the operator to perform both the left and right side clutch operations and the traveling speed change operation at substantially the same time, and the turning radius when turning in the field headland increases. there were. Therefore, by installing left and right hydraulic continuously variable transmissions that transmit engine power separately and driving the left and right crawlers, it is possible to easily reduce the turning radius and reduce the turning radius, etc. There was a problem that the steering operation for traveling along the uncut grain row was troublesome. In addition, by providing a single hydraulic continuously variable transmission mechanism that transmits engine power to the left and right traveling crawlers, and a hydraulic continuously variable steering mechanism that decelerates the traveling crawler on the inside of the turn and accelerates the traveling crawler on the outside of the turn, The straight running performance can be maintained well and the turning radius can be easily reduced, but there is a problem that the turning radius becomes larger by increasing the traveling speed or the turning radius becomes smaller by reducing the traveling speed. For example, to obtain a steering sensation that keeps the turning radius substantially constant regardless of the traveling speed, as in a four-wheeled vehicle, the operator sensibly changes the steering operation amount according to the change in the traveling speed during a traveling shift operation. There is a problem in handling such that it is easy to move away from the uncut grain row by meandering during agricultural work performed by straight traveling. In particular, when a round steering handle is provided, the steering performance can be improved while maintaining a constant traveling speed as compared with a steering structure having a left and right side clutch and a left and right side clutch lever. There is a problem that it is not easy to steer as if driving a four-wheeled vehicle, and it is not possible to easily improve driving operability such as driving speed change operation and steering operation and improvement of steering function. . Accordingly, the applicant of the present invention continuously changes the difference between the differential mechanism that transmits the driving force of the engine to the left and right traveling crawlers, the speed change member that changes the driving speed of the left and right traveling crawlers continuously, and the driving speed of the left and right traveling crawlers. In a mobile agricultural machine provided with a steering member, a steering input shaft that is rotated by a steering operation tool, a transmission input shaft that is rotated by a transmission operation tool, a transmission mechanism that connects the transmission input shaft to the transmission member, and a steering input shaft The steering mechanism is connected to the steering member, and the steering mechanism steering amount is changed in proportion to the operation amount of the speed change mechanism. The steering amount is automatically reduced by the side traveling shift, and the turning radius of the left and right traveling crawlers is maintained substantially constant regardless of the traveling speed by a certain amount of operation of the steering operation tool. Crops such as a column in the path modification be along the body and have developed easily performed technique.
[0003]
[Problems to be solved by the invention]
In short, the above-mentioned technique is mainly applied to the main steering operation input unit from the side column on the side of the driver's seat and the straight traveling HST together with the steering operation output unit to the turning HST on the round handle type steering column in front of the driver's seat. A shift operation output unit is provided, so that the main shift operation is not directly transmitted to the straight traveling HST, but is once inputted into the steering column and transmitted to the straight traveling HST, and the main shift operation amount inputted by the internal mechanism of the steering column is set. The steering operation amount is changed proportionally, and the steering operation is transmitted to the turning HST. The main transmission operation transmission member that transmits the main transmission operation from the side column to the steering column, and the main transmission from the steering column. Relatively long operation transmission such as main transmission operation transmission member and steering operation transmission member that transmits operation and steering operation to straight traveling HST and turning HST Material is required can not be obtained the desired function can not be properly transmitted to the main speed change operation and steering operation by using these operation transmitting member.
[0004]
Accordingly, an object of the present invention is to provide a mobile agricultural machine that can properly transmit a main shift operation and a steering operation from a round handle type steering column to a straight traveling HST and a turning HST.
[0005]
In addition, it is possible to prevent the main gear shift operation from being transmitted to the steering column due to an erroneous operation of the main gear shift levers such as the main column shift lever of the side column when the vehicle is parked, thereby preventing damage to the internal mechanism of the steering column or running of the aircraft. In addition, there is provided a mobile agricultural machine capable of providing the mechanism without any obstacles such as maintenance for properly transmitting main shift operation and steering operation from the steering column to the HST for straight traveling and the HST for turning. The purpose is to do.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a mobile agricultural machine of the present invention includes a main steering operation input unit from a side column on the side of the driver's seat along with a steering operation output unit to the turning HST on a round handle type steering column in front of the driver's seat. In the mobile agricultural machine provided with the main shift operation output unit to the straight traveling HST, a mission for mounting each HST is disposed below the side column, and the steering column steering operation output unit and the turning HST Length-adjustable steering operation transmission member that transmits steering operation between the main shift operation and the main shift operation that transmits the main shift operation between the main shift operation output portion of the steering column and the straight traveling HST A transmission member is provided, and a length adjusting portion of each transmission member is disposed on the upper side of the mission unit. As a result, the three missions equipped with the steering column, side column, turning HST, and straight traveling HST are placed closer together than before, and the transmission distance of the main shift operation and steering operation is shortened. In other words, the main shift operation and the steering operation accuracy are increased. In addition, mud and dust are prevented from adhering to the main shift operation and steering operation systems and other side column internal mechanisms with the dust cover of the mission and the mission section, etc., and the transmission accuracy of the main shift operation and steering operation is reduced. Reduce. Further, the length adjustment of the steering operation transmission member and the main transmission operation transmission member from the steering column to the turning HST and the straight traveling HST is performed, and the steering operation input unit and the main transmission operation input unit of the turning HST and the straight traveling HST are adjusted. Appropriately performed while visually checking the state, the main shift operation system and the steering operation system are properly formed, and maintenance can be easily performed. These are always kept in an appropriate state, and the transmission accuracy of the main shift operation and the steering operation is maintained. In other words, the main shift operation and the steering operation accuracy are increased.
[0007]
In addition, a round steering steering column in front of the driver's seat has a steering operation output unit to the turning HST, a main transmission operation input unit from the side column on the driver's side, and a main transmission operation output unit to the straight traveling HST. In the provided mobile agricultural machine, a mission for mounting each of the HSTs is disposed below the side column, and when the parking brake provided for the mission is applied, the main transmission lever of the side column is held or returned to the neutral position. A check mechanism is provided, and the check mechanism is disposed above the main shift lever fulcrum. This prevents accidental operation of the main gearshift operating section such as the side column main gearshift lever when parked, and ensures that the main gearshift operating section is held in the neutral position when parked, and the erroneous main gearshift operation is transmitted to the steering column. This prevents the internal mechanism of the steering column from being damaged and the vehicle from running. In addition, the upper space of the mission for adjusting the length of the steering operation transmission member and the main transmission operation transmission member from the steering column to the turning HST and the straight traveling HST is prevented from being filled by the check mechanism, The lengths of the steering operation transmission member and the main transmission operation transmission member can be easily adjusted, the main transmission operation system and the steering operation system can be properly formed, and maintenance can be easily performed. The transmission accuracy of the main shift operation and the steering operation is increased, that is, the accuracy of the main transmission operation and the steering operation is increased.
[0008]
Further, the side wall of the driver's seat on the side column and / or the step plate of the driver's cab are formed so as to be freely opened and closed. As a result, maintenance of the main and auxiliary transmission operation systems and steering operation systems on the upper side of the mission, the steering brake system, the parking brake operation, the check mechanism, and other side column internal mechanisms can be easily performed from the driver's side, and these are always in an appropriate state. Keep on.
[0009]
The term “HST” in the specification of the present application means a hydraulic drive unit (hydro-static transmission), which transmits power using hydraulic pressure, and is first generated by driving a hydraulic pump with an engine. The structure is such that pressure oil is guided to the hydraulic motor to transmit power. The speed is adjusted by changing the amount of oil using a variable displacement pump composed of a swash plate and a plunger.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the drawings. 1 is an overall side view of the combine, and FIG. 2 is a plan view thereof. In FIG. 1, (1) is a track frame on which a pair of left and right traveling crawlers (2) are installed, and (3) is the track frame (1). A chassis frame to be installed, (4) is a threshing section that stretches the feed chain (5) to the left and incorporates a handling cylinder (6) and a processing cylinder (7), (8) is a cutting blade (9) and grains A mowing unit provided with an eaves conveying mechanism, (11) is a hydraulic cylinder that raises and lowers the mowing unit (8) via the mowing frame (12), and (13) is an excretion processing unit that faces the end of the excavation chain (14). , (15) is a grain tank that carries the grain from the threshing section (4) through the milled cylinder (16), (17) is a discharge auger that carries the grain of the tank (15) out of the machine, (18) is a driver's cab having a round steering handle (19) and a driver's seat (20). (21) is an engine provided in the driver's seat (20) downward, and configured to threshing continuously harvests culms.
[0011]
Further, as shown in FIG. 3, the transmission (22) for driving the traveling crawler (2) includes a pair of first hydraulic pump (23) and a first hydraulic motor (24), and a hydraulic pressure for traveling main transmission. Turning that forms a hydraulic continuously variable transmission mechanism for turning by including a straight HST (25) that forms a continuously variable transmission mechanism, a pair of second hydraulic pump (26), and a second hydraulic motor (27) HST (28), and the output shaft (21a) of the engine (21) is connected to the input shafts (29a) and (29b) of the first and second hydraulic pumps (23) and (26) with the transmission belt (30a) ( 30b) and the hydraulic pumps (23) and (26) are driven.
[0012]
Further, the drive wheels (34) of the left and right traveling crawler (2) are interlockedly connected to the output shaft (31) of the first hydraulic motor (24) via the subtransmission mechanism (32) and the differential mechanism (33). The differential mechanism (33) has a pair of symmetrical planetary gear mechanisms (35), and each planetary gear mechanism (35) includes one sun gear (36) and the sun gear (36). It is formed by three planetary gears (37) meshing with the outer periphery and a ring gear (38) meshing with these planetary gears (37).
[0013]
The planetary gear (37) is rotatably supported by the carrier (41) of the carrier shaft (40) coaxial with the sun gear shaft (39), and the left and right sun gears (36) (36) are sandwiched between the left and right carriers. The ring gear (38) has an inner tooth (38a) that meshes with each planetary gear (37) and is arranged on the same axis as the sun gear shaft (39), so that the carrier shaft (40 The carrier shaft (40) is extended to form an axle to support the drive wheel (34).
[0014]
The straight traveling HST (25) controls the forward and reverse rotation and the rotational speed of the first hydraulic motor (24) by adjusting the angle change of the rotary swash plate of the first hydraulic pump (23). The rotational output of the motor (24) is fixed to the sun gear shaft (39) from the transmission gear (42) of the output shaft (31) via the gears (43) (44) (45) and the auxiliary transmission mechanism (32). The sun gear (36) is rotated by being transmitted to the center gear (46). The sub-transmission mechanism (32) includes a sub-transmission shaft (47) having the gear (44) and a parking brake shaft (49) having a gear (48) meshing with the center gear (46) via the gear (45). ), And a pair of low speed gears (50) (51), medium speed gears (52) (53), and high speed gears (54) between the auxiliary transmission shaft (47) and the brake shaft (49). (48) is provided, and the sub-shift is switched between low speed, medium speed, and high speed by the sliding operation of the low and medium speed slider (55) and the high speed slider (56). There is neutrality between low speed and medium speed and between medium speed and high speed. In addition, a parking brake (57) is provided on the brake shaft (49), and gears (59) (60) and a one-way clutch (61) are provided on a cutting PTO shaft (58) that transmits rotational force to the cutting portion (8). The sub-transmission shaft (47) is coupled to the cutting part (8) at the vehicle speed synchronization speed.
[0015]
As described above, the driving force from the first hydraulic motor (24) transmitted to the sun gear shaft (39) via the center gear (46) is transmitted to the left and right carrier shafts (40) via the left and right planetary gear mechanisms (35). ) And the rotation transmitted to the left and right carrier shafts (40) to the left and right drive wheels (34), respectively, to drive the left and right traveling crawler (2).
[0016]
Further, the turning HST (28) controls the forward / reverse rotation and the rotational speed of the second hydraulic motor (27) by adjusting the angle change of the rotary swash plate of the second hydraulic pump (26). A brake shaft (63) having a brake (62), a clutch shaft (65) having a steering output clutch (64), and left and right input gears that are always meshed with the external teeth (38b) of the left and right ring gear (38). 66) (67), the clutch shaft (65) is connected to the output shaft (68) of the second hydraulic motor (27) via the brake shaft (63) and the steering output clutch (64), and the clutch shaft The right input gear (67) is coupled to (65) via the forward rotation gear (69), and the left input gear (66) is coupled to the clutch shaft (65) via the forward rotation gear (69) and the reverse rotation gear (70). ). Then, the brake (62) is turned on and the clutch (64) is turned off by the neutral of the auxiliary transmission sliders (55) and (56), while the brake (62) is turned off and the clutch is turned off at the time of the auxiliary transmission other than the neutral. (64) is turned on, the rotation of the motor (27) is transmitted to the external teeth (38b) of the right ring gear (38) via the normal rotation gear (69), and the external teeth (38b) of the left ring gear (38). The rotation of the motor (27) is transmitted through the forward rotation gear (69) and the reverse rotation gear (70) to the left ring gear (38) at the same left and right rotation speed when the second hydraulic motor (27) rotates forward (reverse rotation). Is reversely rotated (forward rotation), and the right ring gear (38) is rotated forward (reverse rotation).
[0017]
Thus, when the first hydraulic motor (24) for straight running is driven in a state where the second hydraulic motor (27) for turning is stopped and the left and right ring gears (38) are stationary and fixed, the first hydraulic motor ( The rotational output from 24) is transmitted from the center gear (46) to the left and right sun gears (36) at the same rotational speed, and the left and right traveling crawlers are transmitted via the planetary gear (37) and carrier (41) of the left and right planetary gear mechanism (35). (2) is driven at the same rotational speed in the same rotational direction on the left and right, and the machine body travels straight forward and backward. On the other hand, when the second hydraulic motor (27) for rotation is driven to rotate in the forward / reverse direction with the first hydraulic motor (24) for rectilinear movement stopped and the left and right sun gears (36) stationary and fixed, the left planet The gear mechanism (35) rotates forward or backward, and the right planetary gear mechanism (35) rotates backward or forward, driving the left and right traveling crawler (2) in the reverse direction and turning the aircraft to the left or right. Further, by driving the second hydraulic motor (27) for turning while driving the first hydraulic motor (24) for straight traveling, the aircraft turns left and right to correct the course. The turning radius is determined by the output rotational speed of the second hydraulic motor (27).
[0018]
Further, as shown in FIGS. 1, 2 and 4 to 7 and 15 to 26, a steering column (71) is fixed upright on the upper surface of the front portion of the cab (18), and the steering column (71) is fixed. A steering handle (19) is provided on the upper side of the upper surface so as to be rotatable about the vertical axis, a side column (72) is provided on the left side of the cab (18), and a mission (22) is provided below the side column (72). A main transmission lever (73), an auxiliary transmission lever (74), a harvesting clutch lever (75), a threshing clutch lever (76), and the like are provided on the side column (72). The steering column (71) is formed by molding an aluminum alloy casting, and is formed into a box shape by fastening with a plurality of bolts (77) in a split structure that can be divided into left and right.
[0019]
Further, a tilt base (78) is integrally formed on the steering column (71), and a tilt bracket (80) is rotatably supported on the tilt base (78) via a fulcrum bolt (79). The tilt bracket (80) is fixed by 81) so that the angle can be adjusted. The lower part of the shaft case (82) is integrally fixed to the tilt bracket (80), the shaft case (82) is extended above the upper surface cover (83) to be fixed to the upper surface of the column (71), and the shaft case (82) is disposed inside. The upper handle shaft (84) is rotatably supported, the steering handle (19) is fixed to the upper end of the upper handle shaft (84), and the handle (19) around the fulcrum bolt (79) is operated by the tilt lever (81). Is moved and adjusted in the front-rear direction to be supported at a fixed position, and the handle (19) mounting position is adjusted in the front-rear direction to be fixed at a position that is easy for the operator to operate.
[0020]
Further, the upper end side of the lower handle shaft (86) is connected to the lower end portion of the upper handle shaft (84) via a universal joint (85) so that the lower handle shaft (86) can be rotated to the upper portion of the steering column (71). The upper end of the steering input shaft (87) is rotatably supported on the upper part of the steering column (71), and the gear (88) of the lower handle shaft (86) and the sector gear of the steering input shaft (87) are supported. (89) is engaged to connect the shafts (86) and (87), and the steering input shaft (87) is extended in the vertical direction substantially at the center inside the steering column (71).
[0021]
Further, a bearing portion (90) is integrally formed on the left side surface of the steering column (71) in the middle of the vertical width, and one end portion of the transmission input shaft (91) is connected to the bearing portion (90) via a bolt (92). The shift input shaft (91) is pivotally supported in a cantilever manner so as to be rotatable, and the upper end of the input fulcrum shaft (94) is connected to the lower end of the steering input shaft (87) via a universal joint (93). The lower end side of the input fulcrum shaft (94) is rotatably supported on the transmission input shaft (91). Further, the steering input member (95) is fixed to the upper end side of the input fulcrum shaft (94), and the transmission input member (96) is held between the upper surface of the transmission input shaft (91) and the lower surface of the steering input member (95). The transmission input member (96) is rotatably attached around the input fulcrum shaft (94), and the input members (95) (96) are connected to the transmission input member (96) by linking bolts (97). And both ends of a kneading spring (98) provided on the speed change input shaft (91) are locked to the speed change input member (96), and the speed change input member (96) is moved to the straight forward neutral position by the spring (98). Support. In addition, by rotating the steering input shaft (87) forward and backward, the input members (95) and (96) are rotated forward and backward around the core line of the substantially vertical input shaft (87) against the spring (98). The input fulcrum shaft (94) and the input members (95) and (96) are tilted in the front-rear direction about the substantially horizontal input shaft (91) core line by forward and reverse rotation of the speed change input shaft (91). A universal joint (93) is attached to the intersection point where the vertical steering input shaft (87) core wire and the horizontal shifting input shaft (91) core wire intersect at right angles, and the steering input shaft ( 87) The input members (95) and (96) are rotated in the forward and reverse directions about the steering input shaft (87) about the core line by forward and reverse operations.
[0022]
Further, a main transmission shaft (99), which is a main transmission operation input portion from the side column (72), is rotatably supported on the lower front side of the steering column (71), and is horizontally mounted horizontally in the left-right direction. The left end of the transmission shaft (99) protrudes from the front lower side of the steering column (71), while the fulcrum plate (106) is rotatably attached to the lever fulcrum shaft (105) inside the side column (72). A base with a turnbuckle (103), which is a main transmission operation transmission member whose length can be adjusted, is attached to the plate (106) through a cylindrical shaft (107) so that the main transmission lever (73) base is swingable in the left-right direction. The fulcrum plate (106) is connected to the main transmission shaft (99) inside the side column (72) via the adjustable rod (104) and the link (101), and the main transmission lever (73) is rotated around the lever fulcrum shaft (105). In To forward and reverse main transmission shaft (99) by the speed change operation for swinging the rear direction. The main transmission shaft (99) is connected to the transmission input shaft (91) via the rod-shaped main transmission member (110) and the upper and lower links (111) (112), and the main transmission shaft ( 99) The input members (95) and (96) are tilted back and forth about the center line of the transmission input shaft (91) by forward and reverse operations.
[0023]
Further, a cylindrical shaft-shaped steering output shaft (113) is rotatably attached to the main transmission shaft (99), the link-type steering output member (114) is fixed to the steering output shaft (113), and the rod An upper end portion of the shape steering coupling member (115) is connected to the steering input member (95) via a universal joint type steering input connecting portion (116), and a ball joint type steering output connecting portion (117) is connected. A steering mechanism (118) is configured to connect the lower end portion of the steering coupling member (115) to the steering output member (114) via the sway to change the traveling path.
[0024]
Further, a shift output shaft (119) is rotatably supported inside the steering column (71) above the steering output shaft (113) and substantially in parallel with the shaft (113), so that a link type shift output member (120 ) Is fixed to the speed change output shaft (119), and the upper end of the rod-type speed change coupling member (121) is connected to the speed change input member (96) via the universal joint type speed change input connecting portion (122). A transmission mechanism (124) for connecting the lower end portion of the transmission coupling member (121) to the transmission output member (120) via the joint-type transmission output connecting portion (123) and changing the traveling speed and switching between forward and backward travel. It is composed.
[0025]
Furthermore, the outer side shifting operation shaft (125) and the inner steering operation shaft (126) of the double shaft structure which can rotate with each other are connected to the bearing portion (127) at the center of the left and right width on the lower rear side of the steering column (71). The upper end of the speed change operation shaft (125) is connected to the speed change output shaft (119) via the ball joint shaft (128) and the speed change links (129) (130) which are adjustable in length. At the same time, the upper end portion of the steering operation shaft (126) is connected to the steering output shaft (113) via the ball joint shaft (131) and the steering links (132) (133) that are adjustable in length.
[0026]
Further, the operation shafts (125) (126) project from the bottom of the steering column (71) substantially vertically on the same axis, and the upper ends of the operation shafts (125) (126) are located inside the steering column (71). The lower end of each operation shaft (125) (126) protrudes below the bottom surface of the steering column (71), and is connected to each output shaft (113) (119). The lower end side of each operation shaft (125) (126) is extended on the lower surface side of the step board (134) for boarding the worker, and the first trunnion (the main transmission operation input part of the straight traveling HST (25)) 135), the trunnion arm (136) is fixed, and the length adjustment with a turnbuckle (137), which is a main transmission operation transmission member whose length is adjustable between the steering column (71) and the straight traveling HST (25). A trunnion arm (136) is connected to a lower end portion of the speed change operation shaft (125), which is a main speed change operation output portion of the steering column (71), via a universal rod (138) and a link (139). ) To adjust the swash plate angle of the first hydraulic pump (23) to control the rotational speed of the first hydraulic motor (24) and to switch between forward and reverse, steplessly changing the running speed (vehicle speed) and before and after Switch the decimal. Further, the trunnion arm (141) is fixed to the second trunnion (140) which is the steering operation input part of the turning HST (28), and the length between the steering column (71) and the turning HST (28) is fixed. A steering operation shaft (steering operation output part) of the steering column (71) via a length adjustable rod (143) with a turnbuckle (142) which is an adjustable steering operation transmission member and a link (144). 126) The trunnion arm (141) is connected to the lower end portion, and the swash plate angle of the second hydraulic pump (26) is adjusted by forward / reverse operation of the second trunnion (140) to rotate the second hydraulic motor (27). Control and forward / reverse switching are performed to change the steering angle (turning radius) continuously and to change the left / right turning direction.
[0027]
Further, an accelerator lever (145) is provided on the right outer surface of the steering column (71) so as to be rotatable in the front-rear direction, and an accelerator wire (146) for connecting the accelerator lever (145) to the engine (21) is connected to the front surface of the steering column (71). Extending from below along the inside, manually adjusting the engine (21) rotation speed by the accelerator lever (145), and opening a maintenance window (147) on the rear surface of the steering column (71) The maintenance window (147) is closed by (148).
[0028]
Further, as shown in FIGS. 8 and 9, the steering input member (95) is provided with a phase adjustment hole (149) for loosely inserting and inserting the linkage bolt (97), and the steering input shaft (87) core wire is provided. A plurality of (three) screw holes (150) are provided on the same radiation centered, and the phase adjustment hole (149) is formed in a trapezoidal shape with the steering input shaft (87) side as the base centering on the radiation. Thus, when the steering handle (19) in the straight traveling position is rotated left and right, the speed change input member until the linkage bolt (97) fixed to the screw hole (150) contacts the edge of the phase adjustment hole (149). In a state in which (96) is fixed at a certain position by the kneading spring (98), only the steering input member (95) is rotated, and the traveling speed is maintained to be substantially constant, and the left and right are turned to correct the course. . When the linkage bolt (97) contacts the edge of the phase adjusting hole (149), the steering handle (19) is further rotated in the same direction, whereby the steering input member is connected by the linkage bolt (97). (95) and the speed change input member (96) both rotate against the spring (98) to reduce the traveling speed and correct the course, and turn determined by operating the steering handle (19). While the radius and the speed reduction amount change proportionally, the steering handle (19) is returned to the straight-ahead position, whereby the shift input member (96) is returned to the neutral position by the kneading spring (98). It automatically returns to the running speed. Further, by changing the connecting bolt (97) to each screw hole (150), the rotation angle of the steering input member (95) until the connecting bolt (97) contacts the edge of the phase adjusting hole (149) changes. When the steering handle (19) is operated, the deceleration start timing of the traveling speed can be adjusted, and when the steering handle (19) is supported linearly, the speed change input member (96) is shifted by the kneading spring (98). It is fixed to the input shaft (91) and prevents the shift input member (96) from floating due to mechanical vibration or the like, and prevents the running speed from decelerating due to the wobbling of the shift input member (96).
[0029]
Further, as shown in FIGS. 10 to 14, the gear (88) forms a plurality of teeth (151) in an outer peripheral range of 270 degrees, and forms an outer peripheral range of 90 degrees in an arc (152). The total rotation angle of the handle (19) is set to 270 degrees, the angle of left steering rotation or right steering rotation is set to 135 degrees, and the steering handle (19) can be rotated easily with one hand. Form. Further, the sector gear (89) forms a plurality of teeth (153) in an outer peripheral range of 130 degrees, forms an outer peripheral range of 230 degrees in an arc cam (154), and teeth (151) of the gear (88) Are engaged with the teeth (153) of the sector gear (89), and when the maximum forward / reverse rotation of each gear (88) (89), the stoppers (155) on both ends of the arc (152) and the stoppers on both ends of the arc cam (154) ( 156) and restricting the rotation of the steering handle (19), and the steering input member (95) and the transmission input member (96) are set in a range of 65 degrees around the steering input shaft (87) core. A space for arranging the speed change input shaft (91) and the upper end of the main speed change member (110) on the plane on which each input member (95) rotates is secured by rotating forward or reverse, and on the speed change input shaft (91) core line Is provided with a steering input connecting portion (116) And a structure in which the input connecting portions (116) and (122) are separated by 90 degrees on the same circumference can be easily obtained, and the structure can be made compact and the design and assembly can be simplified. .
[0030]
A straight notch (157) is formed at the center of the circular arc cam (154) of the sector gear (89), and a detent shaft (158) is rotatably supported on the upper surface wall of the steering column (71). 158) The detent arm (159) is fixed to the lower end, the detent arm (159) is rotatably supported by the detent arm (159) via the roller shaft (160), and the arc cam (154) is detent-rolled. (161) is brought into contact, and the detent roller (161) is detachably engaged with the rectilinear notch (157) to support the steering handle (19) in the rectilinear position. The detent lever (162) is fixed to the upper end side of the detent shaft (158), and one end of a neutral spring (163) wound around the detent shaft (158) is locked to the detent lever (162) to 71) is brought into contact with the receiving plate (164) of the neutral spring (163), and the detent roller (161) is brought into elastic contact with the arc cam (154) and the straight notch (157) by the neutral spring (163). ing. Further, a microswitch type rectilinear sensor (165) that electrically detects the rectilinear position of the steering handle (19) by switching on and off is attached to the detent lever (162).
[0031]
When the main speed change lever (73) is neutral, the input members (95) (96) and 96 around the core of the steering input shaft (87) by the forward (reverse) operation of the steering handle (19). Each coupling member (115) (121) moves on a conical locus, and the output members (114) (120) and the output shafts (113) (119) are stopped.
[0032]
Further, by the forward (reverse) operation of tilting the main transmission lever (73) forward (rearward), the input members (95) (96) are tilted forward (rearward) around the core line of the speed change input shaft (91) and operated. While maintaining the state where the direction input connecting portion (116) is stopped at a certain position, the shift input connecting portion (122) is moved upward (downward), and the shift output member (120) is swung upward (downward). The transmission output shaft (119) is rotated forward (reverse), and the first hydraulic motor (24) is rotated forward (reverse) by switching the swash plate angle of the first hydraulic pump (23) of the straight traveling HST (25). 1 The left and right traveling crawler (2) is driven forward (reverse) by forward rotation (reverse rotation) of the output shaft (31) of the hydraulic motor (24). Further, the rotation speed of the output shaft (31) changes in proportion to the tilt angle of the main transmission lever (73), and the forward (reverse) speed of the traveling crawler (2) is steplessly changed.
[0033]
Further, under the condition that the main shift lever (73) is moved forward (rearward) and the forward (reverse) operation is performed, the steering handle (19) is rotated leftward (rightward) to thereby input the shift. The steering input member (95) rotates forward (reversely) about the steering input shaft (87) around the core line in a posture in which the steering input member (95) is tilted forward (rearward) around the axis (91), and the steering input connecting portion (116) is The steering output shaft (113) is normally rotated (reversed) by the downward (upward) swing of the steering output member (114), and the second hydraulic pump of the turning HST (28) ( 26) forward rotation (reverse rotation) of the second hydraulic motor (27) by switching the swash plate angle, and left rotation crawler (2) by forward rotation (reverse rotation) of the output shaft (68) of the second hydraulic motor (27). Is decelerated (accelerated) and the right traveling crawler (2) is accelerated (decelerated) to the left (right Direction) to pivot the body to correct the path to the left (right direction). Simultaneously with the course correcting operation, the shift input member (96) is tilted forward (rear) around the core line of the shift input shaft (91) by the leftward (rightward) rotation of the steering handle (19). The steering input shaft (87) rotates forward (reversely) around the core wire, the shift input connecting portion (122) moves downward (upward), and the shift output (120) swings downward (upward) to produce shift output. The shaft (119) is reversely rotated (forward rotation), and control for returning the straight traveling HST (25) to the neutral direction is performed to reduce the rotational speed of the output shaft (31), thereby reducing the traveling speed (vehicle speed). As described above, by the left / right steering operation of the steering handle (19) during traveling, the turning radius (angle) for correcting the course is proportional to the rotation angle of the steering handle (19), and the traveling speed is reduced. By changing the amount and rotating the steering handle (19) largely, the speed difference between the left and right traveling crawlers (2) is increased to reduce the turning radius, and at the same time, the amount of deceleration of the traveling speed increases and the vehicle speed decreases. At the time of forward movement and backward movement, the movement of the turning input connecting portion (116) is reversed with respect to the rotation of the steering handle (19), and the steering handle (19) is rotated in both forward and backward movements. By adjusting the operation direction and the turning direction of the aircraft and rotating the round steering handle (19) to rotate, for example, a course correction and a direction change with a driving feeling similar to that of a four-wheeled vehicle such as a tractor or a rice transplanter. Cormorant.
[0034]
Further, FIGS. 13 and 14 show the relationship between the turning angle of the steering handle (19) and the speed of the left and right traveling crawler (2) when the aircraft is turning left and right, and the turning angle of the handle (19) becomes large. As the speed difference between the left and right traveling crawlers (2) increases, the body center speed, which is the average speed of the left and right traveling crawlers (2), is also reduced according to the traveling speed (high speed, standard, low speed) state. When the steering handle (19) in the straight traveling position is rotated about 15 degrees leftward (rightward), the linkage bolt (97) moves in the phase adjusting hole (149), and the speed is changed by the kneading spring (98). The input member (96) is maintained at the same position as the straight travel, and left by the steering output that causes the second hydraulic motor (27) to rotate forward (reverse) by the second hydraulic pump (26) of the turning HST (28). Turn in the direction (right direction) and correct the course to match the curve of the uncut grain row. At this time, the deceleration amount of the traveling crawler (2) inside the turning and the acceleration amount of the traveling crawler (2) outside the turning become substantially equal, and the body center speed is kept at substantially the same speed as the straight traveling. Further, when the steering handle (19) is rotated by 15 degrees or more from the straight traveling position, the speed change input member (96) decelerates in both the left turn and the right turn against the kneading spring (98). 1 The traveling shift output of the hydraulic pump (23) and the motor (24) is decelerated, the left and right traveling crawlers (2) are rotationally driven in the same direction to advance (or reverse), and the traveling speed difference between the left and right traveling crawlers (2) A brake turn operation that turns leftward (rightward) is performed, and when it is removed from the uncut grain culm (crop) row, the route is returned to the original row or moved to the next row. Further, when the steering handle (19) is rotated about 135 degrees, the center speed of the aircraft is reduced to about one fourth of the straight traveling speed, the traveling crawler (2) inside the turning is driven in reverse, and the traveling crawler inside the turning is driven. A spin turn operation is performed in which the aircraft turns around (2), and the aircraft is turned 180 degrees by shifting the lateral width of the left and right traveling crawler (2) in the turning direction. Rotate the steering handle (19) in the range of degrees to turn left or right, and turn to the uncut grain culm (crop) row in the rotation range of the handle (19) left and right of 15 degrees around the straight position In addition to maintaining the traveling speed while moving straight, the alignment course that moves along the road is changed and the body is turned on the field headland by turning the handle (19) left and right from the straight position to the next work. The spin turn operation to move and automatically decelerated to about a quarter of the speed of straight running performed.
[0035]
Further, when the sub-shift is maintained at a standard speed (1.5 meters per second) and the steering handle (19) is rotated by 90 degrees, the main shift output is set to a high speed and two-thirds by operating the main shift lever (73). Even if it is changed to 1/3, only the turning speed (aircraft center speed) is changed in a state where the turning radius of the airframe is kept substantially constant. Further, the first hydraulic pump (23) and the first hydraulic motor (24) are maintained in a straight traveling state within a set range of the linkage bolt (97) and the phase adjusting hole (149) with reference to the straight traveling position, and the crop row or Even if a steering operation is carried out along the dredger, etc., the running speed is prevented from changing unevenly, and the course can be corrected during farm work while maintaining the same running speed. It is possible to perform an appropriate steering operation by substantially matching the traveling operation of the vehicle. Further, the sub-shift lever (74) for switching the shift reference value of the main shift lever (73) changes the turning radius from a small diameter to a large diameter in proportion to the low speed, standard and high speed switching of the sub-shift operation, and the first hydraulic pump ( 23) and the reduction ratio between the motor (24) and the traveling crawler (2) and the reduction ratio between the second hydraulic pump (26) and the motor (27) and the traveling crawler (2), or necessary for the spin turn operation. While ensuring the driving force required for small radius turning, and operating the main speed change lever (73) at the same sub-shift operation position, the running speed during turning is changed with the turning radius kept substantially constant. Thus, the driving operation can be performed according to the skill level of the worker, and the mobility and the driving operability are improved.
[0036]
As described above, the differential mechanism (33) that transmits the driving force of the engine (21) to the left and right traveling crawler (2), and the straight traveling HST (25) that continuously changes the driving speed of the left and right traveling crawler (2). And a steering input shaft (87) that is rotated by a steering operation tool (19) in a mobile agricultural machine provided with a turning HST (28) that changes the difference in driving speed between the left and right traveling crawlers (2) steplessly, A transmission input shaft (91) rotated by a transmission operation tool (73), a transmission mechanism (124) for connecting the transmission input shaft (91) to the transmission member (25), and a steering input shaft (87) as a steering member. The steering mechanism (118) connected to (28) is provided, and the steering mechanism (118) is configured to change the steering amount in proportion to the operation amount of the transmission mechanism (124). Steering column (7 ) To the main shift operation input section (99) from the side column (72) on the side of the driver's seat (20) and the straight travel HST (25) together with the steering operation output section (126) to the turning HST (28). The main shift operation output section (125) is provided so that the main shift operation is not directly transmitted to the straight traveling HST (25), but is input to the steering column (71) and transmitted to the straight traveling HST (25). By changing the steering operation amount in proportion to the main shift operation amount input by the internal mechanism of the steering column (71) and transmitting the steering operation to the turning HST (28), the steering operation amount is controlled by the high-speed side traveling shift. The direction amount is automatically increased and the steering amount is automatically reduced by the low speed side shifting, and the left and right traveling crawler (2) is turned by a certain amount of operation of the steering handle (19) regardless of the traveling speed. Maintaining the size substantially constant, and configured to easily perform such route modifications be along the body such as the changes and the crop string in farming running speed.
[0037]
By the way, as shown in FIG. 3 and FIGS. 15 to 26, the mission (22) is positioned at a position below the side column (72) at the approximate center of the axle case (166) that supports the left and right drive wheels (34) of the left and right traveling crawler (2). ) And the engine (21) at the rear of the mission (22), the turning HST (28) is integrated on the front side of the upper part of the mission (22), and the straight traveling HST (25) is integrated on the rear side. The left end of the drive shaft (29a) of the first hydraulic pump (23) that projects to the left outside of the straight traveling HST (25) constituting the mission (22) is the engine output shaft on the left side of the engine (21). (21a) is interlocked with the pulleys (167) and (168), the belt (30a) and the tension pulley (169), and is inserted through the straight HST (25) to the left and right. A pulley (170) (171), a belt (30b), and a tension pulley (172) are connected to a drive shaft (29b) of a second hydraulic pump that projects the right end of the dynamic shaft (29a) to the right outside of the turning HST (28). ), The drive system (173) of the straight traveling HST (25) is arranged on the left side, and the drive system (174) of the turning HST (28) is arranged on the right side. It is configured to perform the driven.
[0038]
Further, the cutting that is arranged below the straight traveling HST (25) and on the cutting output pulley (175) of the cutting PTO shaft (58) that protrudes to the left outer side of the transmission (22) and above the rear traveling HST (25). The mowing input pulley (177), which is the mowing input portion of the input shaft (176), is interlocked and connected to the mowing portion (8) via the belt (178), which is a transmission system, and the tension pulley type mowing clutch (179). The engine output shaft is connected to a threshing input shaft (180) disposed at the rear of the engine (21) via pulleys (181) (182) and a belt (183) and a tension pulley type threshing clutch (184). (21a) is linked and connected so as to transmit power to the threshing section (4).
[0039]
Then, the bosses (136a) (141a) at the base ends of the trunnion arms (136) and (141) for rectilinear advance and turn are fixed to the trunnions (135) and (140), which are shaft bodies, via bolts (185). Thus, the connection with the rods (138) and (143) is facilitated and the maintainability is improved, and the straight trunnion arm (136) and the rod (138) have a shaft (186) and a long hole (187). The trunnion arm (141) for turning and the rod (143) are connected via a shaft (188), and the HST (25) (28) is connected to the neutral region. A centering set mechanism (198) (199) for setting the neutral position is provided on the upper surface of each HST (25) (28). Each centering set mechanism (198) (199) A neutral holding detent plate (189) is integrally connected to the bosses (136a) (141a) of the trunnion arms (136) (141), and the detent shaft (190) fixed to the outer wall of each hydraulic pump (23) (26). The detent arm (191) is pivotally supported on the detent arm (191), and the detent roller (192) pivotally supported on the detent arm (191) is moved by a spring (193) force into the concave neutral notch (189a) of the detent plate (189). ) To hold the neutral position of each trunnion arm (136) (141).
[0040]
As shown in FIGS. 1, 2 and 15 to 26, the body-length steering column (71) provided with the steering handle (19) has a chassis frame (3) extending below the cab (18). ) Are fixedly supported at the lower end, and step plates (134) are provided on the upper surface of the cab (18) between the steering column (71) and the driver seat (20) and on both the left and right sides of the lower portion of the steering column (71). It is constructed so that the operator's feet are placed on both the left and right sides of the steering column (71), and the length of the cab (18) is reduced, thereby reducing the overall length of the aircraft.
[0041]
Further, the width of the left step plate (134) of the steering column (71) is made wider than the width of the right step plate (134), and the operator is placed between the steering column (71) and the side column (72). A sufficient space for placing the left foot is placed and the front part of the step plate (134) on the left and right sides of the steering column (71) is formed to be inclined.
[0042]
The step plate (134) is divided into a front left and right step portion on the left and right sides of the steering column (71) and a step main body on the rear side of the steering column (71), and the front left and right step portions are formed. By always fixing to the chassis frame (3) and detachably attaching the step body to the chassis frame (3), maintenance of the structure on the lower surface of the step plate (134) can be easily performed simply by removing the step body. preferable.
[0043]
A fuel tank (200) is disposed below the cab (18), and the fuel tank (200) is fixedly supported on the chassis frame (3), and between the steering column (71) and the fuel tank (200). The shift operation shaft (125) and the steering operation shaft (126) are projected from the steering column (71), and the rods (138) and (143) are passed between the step plate (134) and the fuel tank (200). By connecting to each operation shaft (125) (126), mud and dust adhere to the transmission operation shaft (125), the steering operation shaft (126), and the rods (138) (143). This is configured to reduce the factors that lower the transmission accuracy of the main speed change operation and the steering operation.
[0044]
Further, the length of the rods (138) and (143) is adjusted by the neutral position of the trunnion arms (136) and (141) and play between the trunnion arm (136) and the rod (138) for rectilinear movement, that is, the long hole (187). In the structure in which the straight HST (25) and the turning HST (28) are disposed below the side column (72), the rod (138) is confirmed. A turnbuckle (137) (142) that is a length adjusting portion of (143) is provided on the upper side of the mission (22) portion, or a turnbuckle (137) that is a length adjusting portion of the rod (138) (143) ( 142) is provided on the upper side of each HST (25) (28) mounted on the mission (22), or a turnbuckle (137) which is a length adjusting portion of the rod (138) (143). 142) is provided inside the side column (72), or the turnbuckle (137) (142) which is the length adjusting portion of the rod (138) (143) is connected to the rod (138) on the HST (25) (28) side. (143) The length adjusting portions (137) and (142) of the rods (138) and (143) are provided close to the centering and setting mechanism (198) and (199) of the HST (25) and (28). A length adjusting portion (137) (142) of the rod (138) (143), a centering setting mechanism (198) (199) portion, a trunnion arm (136) for straight traveling, and a rod (138). By placing the play portions (186) and (187) of the rod in the same field of view, the length of the rods (138) and (143) can be adjusted easily and appropriately, and the maintainability is improved. The length of each trunnion (135) (140) and each trunnion arm (136) (141) and each centering set mechanism (198) (199) and the rod (138) (143) for linear movement and turning Factors that prevent adhesion of mud and dust to the adjustment unit and the rods (138) and (143) with the dust cover of the mission (22) and the mission (22) unit, and reduce the transmission accuracy of the main speed change operation and steering operation It is configured to reduce.
[0045]
Further, the main transmission shaft (99) is protruded from the steering column (71) into an excess space on the lower left side of the front part of the step plate (134) formed by raising the front part of the step plate (134). The main transmission shaft (99) is provided between the step plate (134) and the chassis frame (3) to protect the main transmission shaft (99) from external impacts and the like. It prevents dust from adhering and reduces factors that reduce the transmission accuracy of the main speed change operation.
[0046]
The side column (72) is provided with a main transmission lever (73), an auxiliary transmission lever (74), a harvesting clutch lever (75), a lever groove of the threshing clutch lever (76), various switches, a display lamp, a display motor, and the like. Support frame structure of the side column (72) for fixing and supporting the panel (72a) and the side panel (72a) on the upper surface side and mounting the lever fulcrum shafts of the levers (73) (74) (75) (76) (Illustration omitted) and a side wall (202) stretched on the side of the driver seat (20) of the side column (72), etc., and form a main transmission operation part, an auxiliary transmission operation part and a work operation part. A side column (72) is arranged on the left side of the cab (18), and below each side column (72), that is, below the side panel (72a), each HST (25) (28 It is arranged the transmission (22) for mounting.
[0047]
The side wall (202a) of the side column (72) between the steering column (71) and the driver's seat (20) is formed by a cover plate or the like so as to be freely opened and closed, and the main transmission operation system, the steering operation system, and the auxiliary transmission operation system. Side column internal mechanism such as parking brake operation system and check mechanism and maintenance such as each HST (25) (28) and mission (22) and each power transmission system can be easily configured from the cab (18). ing.
[0048]
As described above, the main transmission lever (73) is rotatably supported by the lever fulcrum shaft (105) attached to the support frame structure of the side column (72) and the lever fulcrum shaft (105). A fulcrum plate (106) for pivotally mounting the base of the main transmission lever (73) in the left-right direction via (107), a link (101) and a side connecting the fulcrum plate (106) to the main transmission shaft (99) Rod with length-adjusting turnbuckle (103) that adjusts the inclination from the fulcrum plate (106) at the substantially center inside of the column (72) toward the left end of the main transmission shaft (99) at the lower front of the side column (72) ( 104) is connected to the main transmission shaft (99), and the main transmission operation of the main transmission lever (73) is transmitted to the main transmission shaft (99) without using an intermediate shaft and link. Fulcrum plate ( 06) is directly connected to the main transmission shaft (99), thereby shortening the transmission distance of the main transmission operation from the side column (72) to the steering column (71), increasing the main transmission operation accuracy, and simplifying the structure. The main transmission operation transmission member from the side column (72) to the steering column (71) is not disposed immediately above the length adjusting portion of the rod (138) (143). 72) prevents the main transmission operation transmission member from the steering column (71) from interfering with operations such as adjusting the lengths of the rods (138) and (143) and centering the HSTs (25) and (28). It is configured to do. A friction plate for holding the fulcrum plate (106) is provided on the lever fulcrum shaft (105), and the main transmission lever (73) is operated and positioned. The detent force is obtained by adjusting the spring force by loosely tightening a nut screwed to the fulcrum shaft (105).
[0049]
A sub shift shifter shaft (207), which is a sub shift operation input unit, is provided on the front side of the transmission (22). A side column (72) is provided at the rear portion of the lever fulcrum shaft (105) of the main shift lever (73). ), The sub-shift lever (74) base is pivotally supported on the lever fulcrum shaft (208) attached to the support frame structure, and the sub-shift lever fulcrum is moved forward from the lever fulcrum of the sub-shift to the upper front side of the transmission (22). The sub-shifting shifter shaft (207) shifts the sub-shifting lever (74) back and forth around the lever fulcrum shaft (208) by the sub-shifting operation transmission path extending substantially perpendicularly to the sub-shifting shifter shaft (207). 207), and the auxiliary transmission shifter shaft (207) is rotated forward and backward to switch the auxiliary transmission.
[0050]
Further, the cab (18) is provided with a parking brake pedal (217) and a parking brake lever (218), and the parking brake pedal (217) is connected to a step plate (71) between the steering column (71) and the side column (72). 134) It is arranged on the upper surface side, and the parking brake lever (218) is arranged on the right front part of the cab (18). The pedal fulcrum shaft (219) is arranged on the upper surface side of the rear left corner part of the step plate (134). ) Is mounted horizontally on the left and right sides of the fuselage, and the pedal fulcrum shaft (219) is rotatably attached to the cylindrical shaft (220) fixedly supported on the chassis frame (3), and the pedal fulcrum shaft on the left outside of the side column (72). The pedal arm (221) base is engaged with (219) and the pedal arm (221) is extended from the rear to the front at the left end of the step plate (134), and the pedal arm (2 1) fixing the parking brake pedal (217) at the tip. On the other hand, a lever fulcrum shaft (222) is rotatably mounted on a cylindrical shaft (223) fixedly supported on the chassis frame (3), and a parking brake lever (218) base is supported on the lever fulcrum shaft (222).
[0051]
Then, the pedal fulcrum shaft (219) is inserted into the side column (72) from a notch (224) formed in the rear lower edge of the side wall (202a), and the pedal fulcrum shaft (219) inside the side column (72) is inserted. ) A parking brake fulcrum plate (225), which is a parking brake operation output unit, is integrally attached to the end, and a return spring (228) force is applied to the parking brake fulcrum plate (225) and the pedal arm ( 221) is linked to the parking brake fulcrum plate (225) via the operation wire (226) and the link (229), and the lever fulcrum shaft (222) is connected, and the parking brake operation and parking by depressing the parking brake pedal (217). A parking brake operation by tilting the brake lever (218) is transmitted to the parking brake fulcrum plate (225). Then, the parking brake pedal (217) is depressed by connecting the parking brake fulcrum plate (225) to the parking brake shifter (232) on the left side of the mission (22) as the parking brake operation input section via the operation wire (233). The parking brake operation by the parking brake and the parking brake operation by the tilting operation of the parking brake lever (218) are transmitted from the parking brake fulcrum plate (225) to the parking brake shifter (232) to operate the parking brake (57). is doing.
[0052]
Also provided is a check mechanism (234) for holding the main transmission lever (73) in the neutral position (when already in the neutral position) or returning (when in a position other than neutral) when the parking brake (57) is applied. The check mechanism (234) is composed of a check roller (235) and a check plate (237) having a slot (236) for fitting the check roller (235), and the check roller (235) is mainly used. The fulcrum shaft (229) is attached to the support frame structure of the side column (72) at the rear of the lever fulcrum shaft (105) of the main transmission lever (73) while being attached to the cylinder shaft (107) of the speed change operation system. The check plate (237) is connected via a link (231) to a cylindrical shaft (230) that is rotatably fitted to (229). The parking brake fulcrum plate (225) is connected to the cylindrical shaft (230) via links (238) and (239), and the check plate (237) is connected to the parking brake fulcrum plate (225) of the parking brake operation system. When the parking brake (57) is not applied, the check roller (235) is positioned inside the large portion (236a) of the slot (236) to allow the main speed change operation while applying the parking brake (57). The movement of the check roller (236) from the neutral position is restricted by moving the end of the small portion (236b) of the slot (236) to the position of the check roller (235) when the main speed is neutral. After the return to the neutral position of the check roller (235), the movement from the neutral position is restricted, and the erroneous operation of the main transmission operation part such as the main transmission lever (73) of the side column (72) is prevented when parking is stopped. The main speed change operation unit is securely held in the neutral position when stopped, and an erroneous main speed change operation is transmitted to the steering column (71) to prevent damage to the internal mechanism of the steering column or travel of the airframe. ing.
[0053]
The restraining mechanism (234) is disposed above the lever fulcrum of the main transmission lever (73), and the cylinder shaft (107) or the main shaft that is the main transmission operating system above the lever fulcrum shaft (105). A check roller (235) is attached to the transmission lever (73), a large portion (236a) of the groove hole (236) is formed in the lower portion of the check plate (237), and a groove hole (236a) is formed in the upper portion of the check plate (237). 236) is formed, and when the parking brake (57) is not applied, the check plate (237) is moved and supported above the lever fulcrum shaft (105), and the lower portion of the slot (236) is When the check roller (235) is positioned on the large portion (236a) and the parking brake (57) is applied, the check plate (237) is moved and supported to one side of the fulcrum plate (106), and the slot (236 ) Check the upper small part (236b) 235 is located, a space is provided below the lever fulcrum of the main transmission lever (73) inside the side column (72), the length of each rod (138) (143) is adjusted, and each HST (25) The upper space of the mission (22) for performing the centering of (28) and the like is prevented from being filled by the restraining mechanism (234), and the restraining mechanism (234) prevents each rod (138) (143). It is configured to prevent obstruction of work such as adjusting the length of the HST and centering each HST (25) (28).
[0054]
【The invention's effect】
As is apparent from the above-described embodiments, the present invention provides a round steering steering column (71) in front of the driver seat (20) together with a steering operation output section (126) to the turning HST (28). ) In a mobile agricultural machine provided with a main transmission operation input section (99) from the side column (72) on the side and a main transmission operation output section (125) to the straight traveling HST (25), each HST (25) ( 28) is installed below the side column (72) and steered between the steering operation output part (126) of the steering column (71) and the turning HST (28). The main transmission operation is transmitted between the steering operation transmission member (143) having adjustable length for transmitting the operation, and the main transmission operation output portion (125) of the steering column (71) and the straight traveling HST (25). Adjustable length main The steering column (71) is provided by providing a speed operation transmission member (138) and disposing the length adjusting portions (137) and (142) of the transmission members (138) and (143) on the upper side of the transmission (22) portion. The side column (72), the turning HST (28) and the transmission (22) carrying the straight traveling HST (25) are arranged closer together than before, and the transmission distance of the main shift operation and steering operation is shortened. Therefore, the transmission accuracy of these operations can be increased, that is, the main shift operation and the steering operation accuracy can be increased. Also, the main transmission operation and the steering operation are prevented by the dust cover of the transmission (22) and the transmission (22) part to prevent the mud and dust from adhering to each operation system of the main transmission operation and the steering operation and other side column internal mechanisms. Factors that lower the transmission accuracy can be reduced. Furthermore, the length adjustment of the steering operation transmission member (143) and the main transmission operation transmission member (138) from the steering column (71) to the turning HST (28) and the straight traveling HST (25) is performed. ) And the steering operation input unit (140) and the main transmission operation input unit (135) of the straight traveling HST (25) can be properly performed while visually checking the states of the main transmission operation system and the steering operation system. It can be formed properly and maintenance can be easily performed, and these can always be kept in an appropriate state, and the transmission accuracy of the main shift operation and the steering operation can be improved, that is, the main shift operation and the steering operation. The accuracy can be increased.
[0055]
Further, a round handle type steering column (71) in front of the driver's seat (20) and a steering operation output unit (126) to the turning HST (28) from the side column (72) on the side of the driver's seat (20). In a mobile agricultural machine provided with a main shift operation input unit (99) and a main shift operation output unit (125) to a straight traveling HST (25), a mission (22) in which each HST (25) (28) is mounted is provided. The main transmission lever (73) of the side column (72) is held in the neutral position or held back when the parking brake (57) provided in the transmission (22) is applied, arranged below the side column (72). The check mechanism (234) is provided, and the check mechanism (234) is disposed above the main shift lever fulcrum, so that the main shift lever (73) of the side column (72) when parked is stopped. The main shift operation section is prevented from being erroneously operated, and the main shift operation section (73) is securely held at the neutral position when the vehicle is parked, and the erroneous main shift operation is transmitted to the steering column (71). It is possible to prevent the aircraft from being damaged or traveling. A mission (22) for adjusting the lengths of the steering operation transmission member (143) and the main transmission operation transmission member (138) from the steering column (71) to the turning HST (28) and the straight traveling HST (25). ) Can be prevented from being filled by the check mechanism (234), and the lengths of the steering operation transmission member (143) and the main transmission operation transmission member (138) can be easily adjusted. , Main transmission operation system and steering operation system can be properly formed, maintenance can be easily performed, these can always be kept in an appropriate state, and transmission accuracy of main transmission operation and steering operation can be improved. That is, the accuracy of the main speed change operation and the steering operation can be improved.
[0056]
Further, by forming the side wall (202a) on the driver seat (20) side of the side column (72) and / or the step plate (134) of the cab (18) so as to be openable and closable, the mission ( 22) Maintenance of the upper main and auxiliary transmission operation system, steering operation system, parking brake operation and check mechanism (234), and other side column internal mechanisms can be easily performed from the driver seat (20) side. Can always be kept in proper condition.
[Brief description of the drawings]
FIG. 1 is an overall side view of a combine.
FIG. 2 is an overall plan view of the combine.
FIG. 3 is an explanatory diagram of a mission drive system
FIG. 4 is an operation explanatory diagram of a traveling speed change and steering operation unit.
FIG. 5 is a side view of a steering column.
FIG. 6 is a front view of a steering column.
FIG. 7 is an explanatory plan view of a steering column.
[Fig. 8] Cross section of steering column
FIG. 9 is an exploded explanatory view of FIG.
FIG. 10 is a partial plan view of the upper part of the steering column.
FIG. 11 is a partial view of FIG.
12 is an operation explanatory diagram of FIG.
FIG. 13 is a diagram showing main shift and steering handle operation.
FIG. 14 is a diagram showing sub-shifting and steering handle operation.
FIG. 15: Left side view of cab
16 is a partially enlarged view of FIG.
17 is a partially enlarged view of FIG.
FIG. 18 is a plan view of the cab
19 is a partially enlarged view of FIG.
FIG. 20 is a front view of the cab
21 is a partially enlarged view of FIG. 20;
FIG. 22 Side view of side column and mission
23 is a partially enlarged view of FIG.
24 is a partially enlarged view of FIG.
FIG. 25 is a side view of the check mechanism.
FIG. 26 Plan view of the mission
[Explanation of symbols]
(2) Traveling crawler
(18) Driver's cab
(19) Steering handle
(20) Driver's seat
(21) Engine
(22) Mission
(23) First hydraulic pump
(24) First hydraulic motor
(25) Straight HST
(26) Second hydraulic pump
(27) Second hydraulic motor
(28) HST for turning
(57) Parking brake
(71) Steering column
(72) Side column
(73) Main transmission lever
(99) Main transmission shaft (Main transmission operation input section)
(125) Speed change operation shaft (main speed change operation output unit)
(126) Steering operation axis (steering operation output unit)
(135) First trunnion (main transmission operation input unit)
(137) Turnbuckle (length adjustment part)
(138) Rod (main transmission operation transmission member)
(140) Second trunnion
(142) Turnbuckle (length adjustment part)
(143) Rod (steering operation transmission member)
(202) Side column side wall
(234) Checking mechanism
(217) Parking brake pedal
(218) Parking brake lever

Claims

A round steering type steering column in front of the driver's seat is provided with a steering operation output portion to the turning HST and a main transmission operation input portion from the side column on the driver's seat side and a main transmission operation output portion to the straight traveling HST. In a mobile agricultural machine, a mission for mounting each HST is disposed below the side column, and a length-adjustable operation for transmitting a steering operation between the steering column steering operation output unit and the turning HST is provided. A direction control transmission member and a length-adjustable main transmission operation transmission member for transmitting the main transmission operation between the main transmission operation output portion of the steering column and the straight traveling HST, and a length adjustment portion of each transmission member A mobile agricultural machine characterized in that is disposed above the mission section.

A round steering type steering column in front of the driver's seat is provided with a steering operation output portion to the turning HST and a main transmission operation input portion from the side column on the driver's seat side and a main transmission operation output portion to the straight traveling HST. In a mobile agricultural machine, a restraint mechanism that disposes a mission for mounting each HST below the side column and holds or restores the main transmission lever of the side column to a neutral position when a parking brake provided on the mission is applied. And the check mechanism is arranged above the main shift lever fulcrum.

The mobile agricultural machine according to claim 1 or 2, wherein the driver side wall of the side column is formed to be openable and closable.

The mobile agricultural machine according to claim 1, 2 or 3, wherein the step board of the cab is formed to be openable and closable.