JP4591937B2

JP4591937B2 - Passenger rice transplanter

Info

Publication number: JP4591937B2
Application number: JP2001081927A
Authority: JP
Inventors: 邦夫土井
Original assignee: Yanmar Co Ltd
Current assignee: Yanmar Co Ltd
Priority date: 2001-03-22
Filing date: 2001-03-22
Publication date: 2010-12-01
Anticipated expiration: 2021-03-22
Also published as: JP2002272220A

Description

【０００１】
【発明の属する技術分野】
本発明は、走行車と植付部とで構成する乗用田植機に関する。
【０００２】
【従来の技術】
乗用田植機の植付部はローリング制御機構によって走行車が左右に傾いても水平に保持できるようになっている。このローリング制御機構は、植付部を前後方向（進行方向）に向くローリング支点軸回りで左右に傾けることができるように走行車に連結しておき、植付部の左右の傾きを検出するセンサーの検出値が、植付部が左右に傾いておらず水平のときの値になるように、植付部を左右に傾けるアクチュエーターを制御するものである。この他、前後方向（進行方向）に向くローリング支点軸回りで左右に傾けることができるように走行車に連結した植付部を、単にローリング補正バネによって水平姿勢に弾力的に姿勢保持するものもあった。
【０００３】
そして、後者の植付部のローリング支点部の具体的な構造が特開２０００−４１４２９号公報に示されている。これは走行車の後方に昇降リンク機構を介して取付けられるヒッチの下端部に、下面側を開放する側面視門形のブラケットが取付けられ、このブラケットの前後面にローリング支点軸を差込む孔が開口される一方、苗載台や植付爪などを組付けて植付部を構成する植付フレームのローリング支点軸と直交する部分から前方に連結部材が延出され、この連結部材の先端にローリング支点軸を差込むスリーブ形状のローリング支持部材が取付けられており、ブラケットの内側にローリング支持部材を嵌込み、ブラケットの孔位置とローリング支持部材の孔位置を合わせてブラケットとローリング支持部材にローリング支点軸を挿入することにより、植付部を前後方向に向くローリング支点軸回りで左右に傾けることができるように走行車に連結するようになっている。
【０００４】
また、走行車に対して植付部が左または右のある傾き姿勢に傾いたとき、ヒッチと連結部材をただ一箇所で干渉（当接）させることによって、植付部の左右傾け動作（ローリング）をある範囲に規制するようになっている。すなわち、植付部のローリング規制を行うようになっている。
【０００５】
【発明が解決しようとする課題】
ところが、上記のように植付部のローリング規制を、ヒッチと連結部材のただ一箇所の干渉（当接）で行うと、干渉部にかかる力が極めて大きくなり、この干渉部を凹み変形させる恐れがある。干渉部が凹み変形すると植付部がローリング規制範囲を超えて左右に傾き、ヒッチと植付部の他の構成部品とが当たってしまい、これらを損傷させる恐れがある。このような不都合を防止するために、従来ではヒッチや連結部材の肉厚を厚くするなど強度的に強いものにする必要があり、重量アップ及びコストアップを招いていた。
【０００６】
したがって、上記のような重量アップ及びコストアップを招かないように植付部のローリング規制を行うようにし、軽量化及びコストダウンが図られた乗用田植機を提供することを本発明の主たる目的としている。
【０００７】
【課題を解決するための手段】
【０００８】
上記の目的を達成するために、本発明の請求項１に記載の乗用田植機は、前後方向に向くローリング支点軸回りで植付部を左右に傾けることができるように走行車に連結した乗用田植機において、走行車に連結するヒッチと、植付部の植付フレームにおけるローリング支点軸と直交する部分に連結するローリング支持部材とを、ローリング支点軸により連結し、植付フレームにローリング支持部材を複数箇所で連結させる連結部材を、走行車に対して植付部が左または右の傾き姿勢に傾いたとき、ヒッチと複数箇所で干渉させるように構成したことを特徴とするものであり、この特徴構造によってヒッチと連結部材との各干渉部にかかる力を従来に比べ小さくし、ヒッチと連結部材を従来のものより軽く安いものを使用できるようにし、乗用田植機の軽量化及びコストダウンを図るものである。
【０００９】
【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は乗用田植機の側面図、図２は同平面図を示し、図中１は作業者が搭乗する走行車であり、エンジン２を車体フレーム３に搭載させ、前後方向に長手状のミッションケース４前方にフロントアクスルケース５を介して水田走行用前輪６を支持させると共に、ミッションケース４後部のリアアクスルケース７に水田走行用後輪８を支持させる。そしてエンジン２などを覆うボンネット９両側に予備苗載台１０を取付けると共に、作業者が搭乗する車体カバー１１によってミッションケース４などを覆い、車体カバー１１後側の運転台１２上面に運転席１３を取付け、その運転席１３の前方でボンネット９後部に操向ハンドル１４を設ける。
【００１０】
また、図中１５は４条植え用の苗載台１６並びに複数の苗植付爪１７などを具備する植付部であり、前高後低の合成樹脂製の前傾式苗載台１６を下部レール１８及びガイドレール１９を介して植付フレーム２０に左右往復摺動自在に支持させると共に、一方向に等速回転させるロータリーケース２１を植付フレーム２０に支持させ、ロータリーケース２１の回転軸芯を中心とする対称位置に一対の爪ケース２２を配設し、その爪ケース２２先端に苗植付爪１７を取付ける。また植付フレーム２０の前部左右両端側に左右サイドフレーム２３を立設させて苗載台１６を支持させ、植付フレーム２０前部左右中央のヒッチ２４をトップリンク２５及びロアーリンク２６を含む昇降リンク機構２７を介して走行車１に連結させ、走行車１に設ける油圧昇降シリンダ２８をロアーリンク２６に連結させ、油圧昇降シリンダ２８の駆動時に昇降リンク機構２７を介して植付部１５を昇降させると共に、植付部１５の下降時には左右に往復摺動させる苗載台１６から一株分の苗を苗植付爪１７によって取出し、連続的に苗植え作業を行うように構成する。
【００１１】
また、図中２９は主変速レバー、３０は機体の搭乗位置は勿論のこと機体から降りた位置で走行停止などの操作を可能とさせる苗継ぎレバー、３１は植付昇降レバー、３２は主クラッチペダル、３３は左右ブレーキペダル、３４は２条分均平用のセンタフロート、３５は１条分均平用の左右サイドフロート、３６は４条用の側条施肥機、３７は後輪８の外側に配備させる補助車輪である。
【００１２】
側条施肥機３６は、肥料を入れる肥料ホッパ３８と、肥料繰出ケース３９と、センターフロート３４及びサイドフロート３５の側条作溝器４０にフレキシブル形の搬送ホース４１を介して肥料を排出させるターボブロワー形の送風機４２と、円筒形のエアタンク４３とを備えると共に、エアタンク４３右側端に送風機４２を取付け、４条分４組の肥料繰出ケース３９をエアタンク４３上側に配設させ、肥料ホッパ３８の後側に苗載台１６の上端を近接配備させる。
【００１３】
図３乃至図１２に示す如く、植付部１５の伝動ケースを兼ねる植付フレーム２０は各２条分用のパイプ製左右縦フレーム４４ａ，４４ｂと、左右縦フレーム４４ａ，４４ｂの前端間を連結するパイプ製横フレーム４５とを備え、バルジ加工で形成する十字形のフレーム継手（十字管継手）４６を各縦フレーム４４ａ，４４ｂ後端に溶接固定させ、回転軸４７を介してロータリーケース２１をフレーム継手４６に回転自在に支持させると共に、バルジ加工で形成する十字形のフレーム継手（十字管継手）４８ａ，４８ｂを縦フレーム４４ａ，４４ｂと横フレーム４５に溶接固定させて、これら縦フレーム４４ａ，４４ｂ及び横フレーム４５を機体後方に開放する平面視コの字形に一体連結させて軽量の植付フレーム２０を低コストに形成する。
【００１４】
また、植付フレーム２０の前端右角部となる右側のフレーム継手４８ｂ前面から植付入力軸４９を突出させ、ミッションケース４のＰＴＯ軸からの駆動力を自在継手軸５０を介して植付入力軸４９に伝達させ、横フレーム４５に内挿する植付駆動軸５１右端にベベルギヤ４９ａ，５２を介して植付入力軸４９を連動連結させると共に、左右縦フレーム４４ａ，４４ｂに内挿する植付爪駆動軸５３前端をベベルギヤ５２，５４及び安全クラッチ５５を介して植付駆動軸５１左右端部に連結させ、回転軸４７にベベルギヤ５６ａ，５６ｂ及び植付爪ユニットクラッチ５７を介して植付爪駆動軸５３後端を連動連結させて、苗植付爪１７を駆動する。
【００１５】
さらに、苗載台１６の左右方向の横送りと苗載台１６上の苗の縦送りを行う苗送り軸５８をアルミダイキャスト製の苗送りケース５９を介して植付駆動軸５１の左端に連動連結させるもので、左側のフレーム継手４８ａの左向きの接合端部に設ける溶接フランジ６０に苗送りケース５９一端側のフランジ部６１をボルト止め固定させ、苗送りケース５９の他端側に苗送り軸５８の左端を挿入支持させ、苗送りケース５９内の植付駆動軸５１と苗送り軸５８間に高低変速用の２組の切換ギヤ６２，６３で形成する変速機構６４を介在させ、機体左右方向略中心に対して苗送り軸５８の左半分を苗縦送りカム軸６５に、また右半分を苗台横送りネジ軸６６に設けて、苗送り軸５８の高低２速の回転駆動時に苗載台１６の横送りと、苗載台１６上の苗の縦送りを行う。
【００１６】
回動自在に枢支させ、センターフロート３４後端上面と左右サイドフロート３５後端上面のブラケット６８，６９を植付深さ調節リンク７０，７１を介して植付深さ調節支点軸６７に連結させ、センターフロート３４の前端に連結する昇降リンク７２によってフロート傾斜角度（植付深さ）の変化を検出すると共に、植付深さ調節支点軸６７に基端を固設する植深調節レバー７３によって基準植付深さの調節を行う。
【００１７】
植付深さ調節支点軸６７の左右両端にはＬ形状の左右サイドバンパ７４を取付け部材７５を介して折畳み自在に外方に突設させる。
【００１８】
図８、図１０、図１１にも示す如く、左右筋引マーカー７６を折畳み（起伏）自在に支持する左右マーカー支持ステー７７の基端をフレーム継手４８ａ，４８ｂの外側上面に溶接固定させるもので、マーカー支持ステー７７をＬ型パイプで形成し、前後方向の縦ステー部７７ａをフレーム継手４８ａ，４８ｂ略中央で縦方向の略同一高さ面に線接触で溶接固定させ、横ステー部７７ｂを縦フレーム４４ａ，４４ｂの前方で左右外方に臨ませ、横ステー部７７ｂ先端の取付け軸７８にマーカー台７９を介して筋引マーカ７６を折畳み自在に支持させると共に、左側のマーカー支持ステー７７の横ステー部７７ｂを苗送りケース５９の前方に位置させて苗送りケース５９を保護するバンパとして機能させる。
【００１９】
また図１３にも示す如く、左右マーカー支持ステー７７は左右サイドフレーム２３の基端をフレーム継手４８ａ，４８ｂ側に取付ける左右補強部材８０，８１の内側面にも縦ステー部７７ａ基端を溶接固定させて、これらサイドフレーム２３とマーカー支持ステー７７の支持強度を向上させる。
【００２０】
図１４にも示す如く、苗載台１６下端の苗取出板８２を上下動させて苗取量を調節する苗取調節板８３を、植付フレーム２０のガイド部材８４にガイドロッド８５を介して上下動自在に支持させ、苗取調節板８３のフック８６に係合させる係合板８７を左右方向の苗取量調節軸８８に設け、苗取量調節軸８８の左端側に連結する苗取量調節レバー８９の操作によって、苗植付爪１７が取出す１株分の苗量の調節を行うもので、苗送りケース５９に固設する軸受板９０と右補強部材８１に苗取量調節軸８８の横軸部８８ａの左右両端側を回動自在に支持させ、苗送りケース５９より外方で横軸部８８ａの左端側を前方に略９０度に折曲げて前後方向の縦軸部８８ｂに形成し、苗送りケース５９の前方で縦軸部８８ｂの前端を内方に略９０度に折曲げて、レバー取付部８８ｃに形成して、レバー取付部８８ｃにＬ形状の苗取量調節レバー８９基端を２本のボルト９１で固定させ、苗取量調節レバー８９先端をレバーガイド９２を介して前方斜上方に延設させ、左側の後輪８とその補助車輪３７間に臨ませるように設けて、苗取量調節軸８８の左端部の横軸部８８ａ，縦軸部８８ｂ、レバー取付部８８ｃで苗送りケース５９の前後及び外側を囲んでこれを保護するバンパとして機能させると共に、苗送りケース５９と苗取量調節軸８８の隙間９３で最も左側の植付条の搬送ホース４１の位置決めを行う。
【００２１】
ヒッチ２４はトップリンク２５及びロアーリンク２６を連結させる上下リンク軸９４，９５を有し、植付フレーム２０の横フレーム４５略中央に設けるスリーブ状のローリング支持部材１６０をヒッチ２４の下端にローリング支点軸９７を介して回動自在に連結させ、ヒッチ２４上端の取付座９８に油圧ローリングシリンダ９９を取付け、油圧ローリングシリンダ９９のピストンロッド１００先端を右側のサイドフレーム２３上端の固定ブラケット１０１に連結させ、複動型の油圧ローリングシリンダ９９を往復駆動するギアポンプ１０２と、ギアポンプ１０２を正逆駆動する可逆電動モータ１０３と、油タンク１０４とを油圧ローリングシリンダ９９に一体的に設け、取付座９８上面に固設する受板１０５と苗載台１６裏側面の左右端のブラケット間にローリング補正バネ１０６を張設して、ヒッチ２４左側の横フレーム４５のセンサー台１０７に設けた振子型のローリングセンサ１０８が植付部１５の左右の傾斜を検出するとき、油圧ローリングシリンダ９９のピストンロッド１００を進退制御してローリング支点軸９７回りに植付部１５を左右に揺動させて（傾けて）植付部１５の水平保持を図る。
【００２２】
また、ヒッチ２４の右側で横フレーム４５に溶接固定させる苗送り軸支持部材１０９を設け、苗送り軸支持部材１０９と右側のサイドフレーム２３上端の固定ブラケット１０１とを斜めステー１１０で補強連結させて、最も軽量構造のもので右側のサイドフレーム２３の剛性を向上させて、植付部１５のローリング性能の確保する。
【００２３】
さらに、苗送り軸支持部材１０９で苗送り軸５８の略中間を回転自在に支持させるもので、右側のマーカー支持ステー７７に固設する軸受板１１１と苗送り軸支持部材１０９間に軸受１１２を介して苗台横送りネジ軸６６両端を支持させ、苗縦送りカム軸６５の右端を軸継手１１３を介して苗台横送りネジ軸６６左端に、また苗縦送りカム軸６５の左端を苗送りケース５９にそれぞれ連結支持させて、苗送り軸５８を左右に分割して形成する苗縦送りカム軸６５及び苗台横送りネジ軸６６を両持ち構造とさせて支持強度を向上させると共に、苗縦送りカム軸６５の右端を同一軸芯で苗台横送りネジ軸６６に連結させて苗縦送り精度を向上させる。苗縦送りカム軸６５は鉄製中空パイプで、また苗台横送りネジ軸６６は中実鉄材で形成して、機体の左右中心より左側に苗送りケース５９と苗縦送りカム軸６５を、機体の左右中心より右側に重さの大きい苗台横送りネジ軸６６を振分け配置させて、植付部１５の左右のバランスを取る。
【００２４】
また、苗台横送りネジ軸６６には滑り子１１４をネジ結合させ、苗載台１６に滑り子受け１１５を介して滑り子１１４を連結させて、苗台横送りネジ軸６６の一方向の回転時に苗載台１６を左右往復移動させると共に、苗縦送りカム軸６５には左右縦送りカム１１６を設けて、苗載台１６が左右移動端に移動したときに、従動カム１１７に縦送りカム１１６を当接させ、一方向クラッチ１１８を介して縦送りローラ軸１１９を一方向に回転させて、苗載台１６下端側に設ける上下一対の縦送りローラ軸１１９，１２０の縦送りローラ１２１，１２２間に巻回する縦送りベルト１２３を苗１株分下端方向に移動させる。
【００２５】
図１５乃至図１７にも示す如く、苗送りケース５９を連結させるフレーム継手４８ａは、苗送りケース５９を取付固定する溶接フランジ６０をフレーム継手４８ａの左向きの接合端部に設け、溶接フランジ６０より一定長さ突出させるフレーム継手４８ａの接合端部に嵌合するインロー嵌合部１２４を苗送りケース５９の一側内面に設けると共に、インロー嵌合部１２４の外端にテーパ面１２５を形成し、Ｏリング１２６をテーパ面１２５とフレーム継手４８ａ間に介在させて、溶接フランジ６０とフランジ６１のボルト１２７による締結時にフレーム継手４８ａと苗送りケース５９間の気密保持を簡単構成で低コストな手段によって行う。
【００２６】
苗送りケース５９には植付駆動軸５１とは別体の変速軸１２８を設け、ベベルギヤ５２の内側にスプライン孔１２９を形成して、スプライン孔１２９に植付駆動軸５１左端と変速軸１２８右端とを嵌合させて植付駆動軸５１に変速軸１２８を一体連結させて、苗送りケース５９の取外し時には変速軸１２８も一体で容易に取外し可能とさせる。
【００２７】
また、フレーム継手４８ａとベベルギヤ５２間にベアリング１３０を介設して、フレーム継手４８ａの左向きの接合端部内側にベベルギヤ５２を回転自在に支持させ、ベアリング１３０位置より外側のフレーム継手４８ａ接合端部外周面に溶接フランジ６０を溶接固定させて、フレーム継手４８ａの苗送りケース５９接合端部におけるベアリング１３０嵌合部の内径ａより溶接フランジ６０取付部の内径ｂを大（ａ＜ｂ）に形成して、溶接フランジ６０の溶接歪みでフレーム継手４８ａの苗送りケース５９接合端部が多少変形してもベアリング１３０の組立には悪影響を与えないようにする。
【００２８】
さらに、苗送りケース５９は縦ケース部５９ａと横ケース部５９ｂとを有するＬ形状に形成し、横ケース部５９ｂの右端にフランジ部６１を形成し、縦ケース部５９ａに切換ギア６２，６３で形成する変速機構６４を、横ケース部５９ｂに変速切換機構１３１を組込むもので、切換ギア６２，６３は変速軸１２８に遊転支持する駆動側ギア６２ａ・６３ａと、苗縦送りカム軸６５左端に結合固定する従動側ギア６２ｂ，６３ｂとを有すると共に、変速切換機構１３１は変速軸１２８のキー溝１３２内に埋設して先端をシートバネ１３３力で駆動側ギア６２ａ，６３ａのキー溝１３４に択一的に係合させるシフトキー１３５と、シフトキー１３５にシフトリング１３６及びシフター１３７を介して連結させる切換レバー１３８とを有し、切換レバー１３８の左端操作部１３８ａを苗送りケース５９左外方の前側に突出させて、切換レバー１３８の左右方向の押引操作によって高低２速の苗送り速度の切換を行う。
【００２９】
また、切換ギア６２，６３はシフトキー１３５と係合する側の駆動側ギア６２ａ，６３ａを鉄など金属材料で、また他側の従動側ギア６２ｂ，６３ｂを樹脂材料で形成して、軽量化と耐久性の両方の向上を図る。
【００３０】
図１８、図１９にも示す如く、植付フレーム２０は前側のフレーム継手４８ａ，４８ｂ内にコンパクトにベベルギア４９ａ，５２，５４を組込むと共に、後側のフレーム継手４６にコンパクトにベベルギア５６ａ，５６ｂ及び植付爪ユニットクラッチ５７を組込んで、構造の簡単化とコストダウンを図るもので、植付爪ユニットクラッチ５７は回転軸４７に遊転支持するベベルギヤ５６ｂに固定クラッチ部１３９を、回転軸４７に左右摺動自在にスプライン嵌合させる摺動体１４０に可動クラッチ部１４１をそれぞれ形成し、常時はクラッチバネ１４２によって摺動体１４０を押圧して固定クラッチ部１３９と可動クラッチ部１４１を結合（クラッチ入り）させると共に、摺動体１４０をクラッチバネ１４２力に抗して後退させるクラッチ操作部材１４３をフレーム継手４６に進退自在に設けて、クラッチ操作部材１４３をレバー１４４などを介して苗載台１６裏側などに配設するユニットクラッチレバー（図示せず）に連結させて、このクラッチレバー操作によって植付爪ユニットクラッチ５７の入切を行う。
【００３１】
図２０の（１）（２）に示す如く、サイドバンパ７４は植付深さ調節支点軸６７の両端に固設する側面視コ形状の取付け部材７５にバンパ折曲垂直部７４ａを上下動自在に挿通させ、取付け部材７５より下方に突出させるバンパ折曲垂直部７４ａのバネ座１４５と取付け部材７５間に圧縮バネ１４６を介設させると共に、取付け部材７５の左端面及び前面に当接させるＬ形状の位置規制板１４７をバンパ折曲垂直部７４ａに固定させ、位置規制板１４７の後方への回動を阻止するストッパ部１４８を取付け部材７５に設け、位置規制板１４７と取付け部材７５左端面との当接位置ではバンパ折曲水平部７４ｂを植付深さ調節支点軸６７の延長方向に突出状態とさせて苗取出板８２などを保護する一方、圧縮バネ１４６に抗しサイドバンパ７４を上方に引上げ前方にバンパ折曲水平部７４ｂを略９０度回動させ、位置規制板１４７と取付け部材７５前面とを当接させるバンパ収納位置のとき機体巾を縮小させて軽トラックの荷台への積込みや車庫格納を容易に行う。
【００３２】
苗送りケース５９の内部伝動機構は苗縦送りカム軸６５と変速軸１２８の２軸構成とし、２組の切換ギア６２，６３やシフトキー１３５の簡単な変速機構６４及び変速切換機構１３１を苗送りケース５９に組込む構成のため、型代を低く抑え低コストで小型軽量に苗送りケース５９を形成すると共に、苗送りケース５９のケース本体側にボルト１４９を介して固定させる左側面部のケース蓋１５０を取外して、切換ギア６２，６３の交換や内部伝動機構の点検など容易に行い、メンテナンス性を向上させる。
【００３３】
また、苗送りケース５９の横ケース部５９ｂを長尺形状とし、縦ケース部５９ａとフランジ部６１との間の距離を大とさせて、ボルト１２７の付け外し作業で工具類を使用する場合には、工具類を容易にボルト１２７位置まで挿入させて苗送りケース５９の着脱作業を簡単に行い、メンテナンス性を向上させる。
【００３４】
上記した植付部１５における各部の構成によって乗用田植機の軽量化及びコストダウンを図る上に、本発明の要旨となる植付部１５のローリング支点部の構成によっても乗用田植機の軽量化及びコストダウンを図るもので、そのローリング支点部の構成を図２１乃至図２８に基づいて以下に詳述する。
【００３５】
機体左右中心線上または機体左右略中心線上で、走行車１の後方に昇降リンク機構２７を介して縦長のヒッチ２４を連結し、そのヒッチ２４の下端部に前後方向（機体進行方向）に向く断面円形の水平軸または略水平軸、すなわちローリング支点軸９７によって、苗載台１６や苗植付爪１７などを組付けて植付部１５を構成する植付フレーム２０の前部で、かつ、ローリング支点軸９７と直交する方向の植付フレーム２０の左右中央部または左右略中央部となる横フレーム４５の左右中央部または左右略中央部をローリング支点軸９７回りで回動自在に枢支させ、また左右のローリング補正バネ１０６によって植付部１５を水平姿勢または略水平姿勢に弾力的に保持させ、植付部１５をローリング支点軸１５を中心に左右に傾けることができるように走行車１に連結し、植付部１５の左右の傾きを検出するローリングセンサー１０８の検出値が、植付部１５が左右に傾いておらず水平のときの値になるように、植付部１５を左右に傾けるアクチュエーター、すなわち油圧ローリングシリンダ９９を作動制御することによって、植付部１５を走行車１が左右に傾いても水平または略水平に保持できるようにしている。すなわちローリング制御を行うように構成している。
【００３６】
ヒッチ２４は、縦長で、側面視で下部が幅広となるテーパー形状をしており、そのヒッチ２４の断面は平面視で開放部を後方に向けるコの字形状に形成している。そして、ヒッチ２４の下端部にヒッチ２４側のローリング支点軸枢支部１５１を設けている。このヒッチ２４側のローリング支点軸枢支部１５１は、ヒッチ２４下端部の左右側壁間に開放部を下方に向ける側面視門形形状のブラケット１５２を溶接固定し、ヒッチ２４の下端部に、左右側面がヒッチ２４の左右側壁によって閉じられ、かつ、上面及び前後面がブラケット１５２によって閉じられて下面のみが開放された植付部１５との接合空間１５３を形成すると共に、接合空間１５３の前後面となるブラケット１５２の前後面に直角に、ローリング支点軸９７を挿通させる円筒形の軸孔を有する短い前後ボス（スリーブ）１５４，１５５を軸芯を一致させて貫通させ、前側のボス１５４の前部をヒッチ２４の前壁を貫通させて前端をヒッチ２４の前面側に突出させ、前側のボス１５４の前端部をヒッチ２４の前壁に溶接固定し、後側のボス１５５の中間部をブラケット１５２の後面に溶接固定し、接合空間１５３の前後面からこの内側に前後ボス１５４，１５５の端部を突出させ、ヒッチ２４の前方からローリング支点軸９７を前側のボス１５４、次いで後側のボス１５５へと差込み、ローリング支点軸９７を接合空間１５３に貫通させた状態でヒッチ２４の下端部に挿通支持させるように構成している。
【００３７】
また、ローリング支点軸９７の挿入始端と反対側の端部にストッパー板１５６を溶接固定し、ヒッチ２４の前方からローリング支点軸９７を前側のボス１５４、次いで後側のボス１５５へと差込み、ローリング支点軸９７を接合空間１５３に貫通させた状態でヒッチ２４の下端部に挿通支持せたとき、ストッパー板１５６をヒッチ２４の前壁に当接させ、ローリング支点軸９７の挿入規制を行うと共に、ストッパー板１５６をヒッチ２４の前壁にボルト１５７及びナット１５８を介して締結固定させ、ローリング支点軸９７の抜止めと回止めを行うように構成している。
【００３８】
一方、植付部１５側のローリング支点軸枢支部１５９は、苗載台１６や苗植付爪１７などを組付けて植付部１５を構成する植付フレーム２０の前部で、かつ、ローリング支点軸９７と直交する方向の植付フレーム２０の左右中央部または左右略中央部となる横フレーム４５の左右中央部または左右略中央部に設けている。この植付部１５側のローリング支点軸枢支部１５９は、ローリング支持部材である中間ボス（スリーブ）１６０と、この中間ボス１６０を横フレーム４５の左右中央部または左右略中央部に、中間ボス１６０の一部が平面視で少なくとも横フレーム４５とラップするように一体に連結させるための連結部材であるヒッチ台１６１とで形成している。
【００３９】
中間ボス１６０は、ヒッチ２４側のローリング支点軸枢支部１５１の接合空間１５３の前後ボス１５４，１５５の間に前後方向に直列に嵌込み可能な長さに形成され、かつ、ローリング支点軸９７を挿通させる円筒形の軸孔を有する。
【００４０】
ヒッチ台１６１は、中間ボス１６０を、この中間ボス１６０と直交する方向の植付フレーム２０となる横フレーム４５の左右中央部または左右略中央部の直上方に接触状態で、かつ、平面視で中間ボス１６０と横フレーム４５が直角に交差するように、前後方向に向けて水平または略水平姿勢で横フレーム４５に複数箇所で連結するものである。
【００４１】
すなわち、ヒッチ台１６１は、少なくとも機体前後方向で対向する複数の鉛直な連結面である前後連結面１６２，１６３を有し、横フレーム４５の前側外面と後側外面から前後連結面１６２，１６３を鉛直に立上げ、前後連結面１６２，１６３の下部を横フレーム４５を挟んで機体前後方向で対向させ、前後連結面１６２，１６３の上部を横フレーム４５より上側で機体前後方向で対向させている。また前後連結面１６２，１６３は、横フレーム４５を挟む下部をヒッチ２４の横幅よりも幅広に形成し、横フレーム４５より上側に突出させる上部をヒッチ２４側のローリング支点軸枢支部１５１の接合空間１５３に嵌込むことができ、かつ、中間ボス１６０を貫通させることができる横幅と高さに形成し、前後連結面１６２，１６３の下部を横フレーム４５に溶接固定する下部固着部１６２ａ，１６３ａとし、前後連結面１６２，１６３の上部を中間ボス１６０を溶接固定する上部固着部１６２ｂ，１６３ｂとすると共に、幅狭の上部固着部１６２ｂ，１６３ｂを幅広の下部固着部１６２ａ，１６３ａの左右中間部から一体延設し、下部固着部１６２ａ，１６３ａの左右側部を上部固着部１６２ｂ，１６３ｂよりも左右に張出し、下部固着部１６２ａ，１６３ａと上部固着部１６２ｂ，１６３ｂとの境目となる前後連結面１６２，１６３の中間部左右両側部に上向き端面１６２ｃ，１６３ｃを形成し、この上向き端面１６２ｃ，１６３ｃを横フレーム４５外周面の最高部の高さ（横フレーム４５の軸芯を通る鉛直線と横フレーム４５の外周面が交わる二点のうちの上側の一点の高さ）に合わせて形成している。そして、横フレーム４５より上側に突出している前後連結面１６２，１６３の上部固着部１６２ｂ，１６３ｂに中間ボス１６０を、この中間ボス１６０底面が横フレーム４５に接触する状態で、直角に貫通させて、中間ボス１６０の前後部を前後連結面１６２，１６３の上部固着部１６２ｂ，１６３ｂに溶接固定すると共に、中間ボス１６０中間部の横フレーム４５との接触部を横フレーム４５に溶接固定し、中間ボス１６０を、この中間ボス１６０と直交する方向の植付フレーム２０となる横フレーム４５の左右中央部または左右略中央部の直上方に接触状態で、かつ、平面視で中間ボス１６０と横フレーム４５が直角に交差するように、前後方向に向けて水平または略水平姿勢で横フレーム４５に複数箇所（三箇所）で連結させている。
【００４２】
前後連結面１６２，１６３は、図示のように一枚の平らな鉄板を横フレーム４５の断面形状に合わせて曲げ成形し一体に形成している。すなわち一枚の平らな鉄板を断面円形の横フレーム４５外周面と同じ曲率でＵ字形に曲げ成形してヒッチ台１６１を側面視でＵ字形に形成し、側面視でＵ字形のヒッチ台１６１の相対向する前後面を前後連結面１６２，１６３としている。そして、側面視でＵ字形のヒッチ台１６１を横フレーム４５に下方から外嵌させ、横フレーム４５をヒッチ台１６１の底部で抱えて持った状態（抱持状態）で、横フレーム４５にヒッチ台１６１を抱持固定させ、横フレーム４５外周面に対するヒッチ台１６１の接触端縁を横フレーム４５に溶接固定し、上記のように横フレーム４５の前側外面と後側外面から前後連結面１６２，１６３を鉛直に立上げ、前後連結面１６２，１６３の下部を横フレーム４５を挟んで機体前後方向で対向させ、前後連結面１６２，１６３の上部を横フレーム４５より上側で機体前後方向で対向させている。
【００４３】
前後連結面１６２，１６３は別体に形成してもよいが、上記のように、ヒッチ台１６１を横フレーム４５を抱えて持つような抱持部材で形成し、横フレーム４５と中間ボス１６０とを複数箇所で連結させるための前後連結面１６２，１６３を一体に形成することにより、前後連結面１６２，１６３を別体に形成したものに比べ、前後連結面１６２，１６３の形成及び組付けが簡単に行え、また前後連結面１６２，１６３の製品寸法誤差及び組付け寸法誤差も少なく精度的に優れ、また前後連結面１６２，１６３と横フレーム４５との溶接面積が多くなり高い接合強度が容易に得られ、引いては横フレーム４５と中間ボス１６０との高い接合強度が得られるなどの理由で優れており、さらに抱持部材であるヒッチ台１６１を横フレーム４５に外嵌するときの開放部は、後で中間ボス１６０により閉じられ、中間ボス１６０と前後連結面１６２，１６３とが相乗的に横フレーム４５との接合強度を高め、植付部１５側のローリング支点軸枢支部１５９を横フレーム４５と完全に一体化させて強度的に強いものにできる。このため、植付部１５側のローリング支点軸枢支部１５９を構成する中間ボス１６０とヒッチ台１６１自体をそれほど強度的に強いものにしなくても、植付部１５側のローリング支点軸枢支部１５９に必要な強度を確保することができ、軽量化とコストダウンに寄与する。
【００４４】
また、Ｕ字形のヒッチ台１６１の横フレーム４５との接触面に抜き孔１６４を設け、横フレーム４５との溶接面積の拡張、すなわち接合強度アップを図ると同時に、軽量化を図っている。ヒッチ台１６１の横フレーム４５との溶接面積の拡張、すなわち接合強度アップは、図から明らかなように横フレーム４５との接触面部の端縁に凹凸を付けることでも行える。
【００４５】
苗送り軸支持部材１０９とヒッチ台１６１の側面を互いに溶接固定しており、苗送り軸支持部材１０９とヒッチ台１６１が互いに補強メンバーとなるようにし、ヒッチ台１６１のさらなる強度アップによるさらなる軽量化とコストダウンに加え、苗送り軸支持部材１０９の強度アップによる軽量化とコストダウンを図っている。
【００４６】
而して、上記のように形成した植付部１５側のローリング支点軸枢支部１５９における中間ボス１６０と前後連結面１６２，１６３の上部固着部１６２ｂ，１６３ｂに上方から、上記のように形成したヒッチ２４側のローリング支点軸枢支部１５１における接合空間１５３を外嵌し、接合空間１５３に中間ボス１６０と前後連結面１６２，１６３の上部固着部１６２ｂ，１６３ｂを嵌込み、かつ、前後ボス１５４，１５５の間に中間ボス１６０を嵌込み、これらボス１５４，１６０，１５５を機体前後方向に直列配置し、かつ、各ボス１５４，１６０，１５５の軸芯を一致させ、ヒッチ２４の前方からローリング支点軸９７を前側のボス１５４、次いで中間ボス１６０、最後に後側のボス１５５へと差込み、ストッパー板１５６をヒッチ２４の前壁に当接させ、ローリング支点軸９７の挿入を規制すると共に、ストッパー板１５６をヒッチ２４の前壁にボルト１５７及びナット１５８を介して締結固定させ、ローリング支点軸９７の抜止めと回止めを行い、ヒッチ２４の下端部にローリング支点軸９７を介して植付部１５を枢支連結し、植付部１５をローリング支点軸１５を中心に左右に傾けることができるように走行車１に連結する。
【００４７】
また、走行車１に対して植付部１５がある範囲を超えて傾かないようにするための干渉部を左右傾き方向それぞれに複数箇所ずつ設けるもので、植付部１５側のローリング支点軸枢支部１５９における前後連結面１６２，１６３の中間部左右両側部に上向き端面１６２ｃ，１６３ｃを形成し、この上向き端面１６２ｃ，１６３ｃを横フレーム４５外周面の最高部の高さに合わせて形成した構成と、ヒッチ２４側のローリング支点軸枢支部１５１における接合空間１５３の左右側面に相当するヒッチ２４の左右側壁下端が、走行車１に対して植付部１５が傾いていないときには、前後連結面１６２，１６３の上向き端面１６２ｃ，１６３ｃ及び横フレーム４５外周面の最高部に対して上方に離反し、走行車１に対して植付部１５が左上がりまたは右上がりに所定角度傾いたとき、前後連結面１６２，１６３の上向き端面１６２ｃ，１６３ｃ及び横フレーム４５外周面の最高部に当接（干渉）するように、ヒッチ２４側のローリング支点軸枢支部１５１における接合空間１５３の左右側面に相当するヒッチ２４の左右側壁下端をヒッチ２４の他の左右側壁下端より側面視門形の切欠き１６５によって持上げ形成する構成とで、走行車１に対して植付部１５が左上がりまたは右上がりに所定角度傾いたとき当接（干渉）する前側の連結面１６２の上向き端面１６２ｃと切欠き１６５の底辺となるヒッチ２４の左右側壁下端で一箇所，後側の連結面１６３の上向き端面１６３ｃと切欠き１６５の底辺となるヒッチ２４の左右側壁下端で一箇所，横フレーム４５外周面の最高部と切欠き１６５の底辺となるヒッチ２４の左右側壁下端で一箇所の合計三箇所の干渉部Ａ，Ｂ，Ｃを設け、さらに走行車１に対して植付部１５が傾いていないときの植付部１５側のローリング支点軸枢支部１５９における前後連結面１６２，１６３の上端中央部、すなわち上部固着部１６２ｂ，１６３ｂの上端中央部を、ローリング支点軸９７の軸芯を中心とする円筒面がヒッチ２４側のローリング支点軸枢支部１５１におけるブラケット１５２上面の内面、すなわち接合空間１５３の天井面に接する半径を有するときの円筒面Ｓの内側に入れ、かつ、走行車１に対して植付部１５が傾いていないときの植付部１５側のローリング支点軸枢支部１５９における前後連結面１６２，１６３の上端左右側部、すなわち上部固着部１６２ｂ，１６３ｂの上端左右側部を、ローリング支点軸９７の軸芯を中心とする円筒面がヒッチ２４側のローリング支点軸枢支部１５１におけるブラケット１５２上面の内面、すなわち接合空間１５３の天井面に接する半径を有するときの円筒面Ｓの外側に出し、走行車１に対して植付部１５が左上がりまたは右上がりに所定角度傾いたときに、植付部１５側のローリング支点軸枢支部１５９における前後連結面１６２，１６３の上端左右側部、すなわち上部固着部１６２ｂ，１６３ｂの上端左右側部が、ヒッチ２４側のローリング支点軸枢支部１５１におけるブラケット１５２上面の内面、すなわち接合空間１５３の天井面に当接（干渉）するように、植付部１５側のローリング支点軸枢支部１５９における前後連結面１６２，１６３の上部固着部１６２ｂ，１６３ｂを形成する構成で、走行車１に対して植付部１５が左上がりまたは右上がりに所定角度傾いたとき当接（干渉）する前側の上部固着部１６２ｂの上端左右側部と接合空間１５３の天井面で一箇所、後側の上部固着部１６３ｂの上端左右側部と接合空間１５３の天井面で一箇所の合計二箇所の干渉部Ｄ，Ｅを設け、走行車１に対して植付部１５が左上がりまたは右上がりに所定角度傾いたとき、植付部１５側のローリング支点軸枢支部１５９の構造部材とヒッチ２４側のローリング支点軸枢支部１５１の構造部材とを同時に五箇所で当接（干渉）させ、植付部１５の左右傾け動作（ローリング）を所定の範囲に規制するように構成している。
【００４８】
また、干渉部Ａ，Ｂ，Ｃの一方となる植付部１５側のローリング支点軸枢支部１５９における前後連結面１６２，１６３の上向き端面１６２ｃ，１６３ｃ及び横フレーム４５外周面の最高部に対して、干渉部Ａ，Ｂ，Ｃの他方となるヒッチ２４側のローリング支点軸枢支部１５１における切欠き１６５の底辺となるヒッチ２４の左右側壁下端の外側角部が当接（干渉）し、干渉部Ａ，Ｂ，Ｃの一方または両方が凹み変形するのを防止するため、ヒッチ２４側のローリング支点軸枢支部１５１における切欠き１６５の底辺となるヒッチ２４の左右側壁下端に外向きのリブ１６６を形成し、このリブ１６６の下面を植付部１５側のローリング支点軸枢支部１５９における前後連結面１６２，１６３の上向き端面１６２ｃ，１６３ｃ及び横フレーム４５外周面の最高部と当接（干渉）させ、干渉部Ａ，Ｂ，Ｃの干渉を面同士で行うように構成している。尚、残りの干渉部Ｄ，Ｅの一方と他方の干渉は面同士で行われている。
【００４９】
上記から明らかなように、植付部１５のローリング支持部材である中間ボス１６０を、該中間ボス１６０と直交する方向の植付フレーム２０である横フレーム４５に、平面視で少なくとも該中間ボス１６０の一部が横フレーム４５とラップするように設けており、中間ボスと１６０と横フレーム４５とを連結する連結部材であるヒッチ台１６１がたとえ必要になったとしても、このヒッチ台１６１の小型化とこれにかかるモーメントの減少により、ヒッチ台１６１が従来のものより軽く安いものを使用できるようになり、乗用田植機の軽量化及びコストダウンを図ることができる。また従来に比べ植付部１５を走行車１に接近配置できるようになり、走行車１の運転席１３に座った状態で植付部１５側の各種操作レバーを操作するときの操作性を向上させることができると共に、機体全長の短縮により走行性能も向上させることができる。
【００５０】
また、植付部１５のローリング支持部材である中間ボス１６０を、該中間ボス１６０と直交する方向の植付フレーム２０である横フレーム４５の直上方に設けており、中間ボス１６０と横フレーム４５とを連結する連結部材であるヒッチ台１６１がたとえ必要になったとしても、このヒッチ台１６１の最小型化とこれにかかるモーメントをほとんどなくすことにより、ヒッチ台１６１が従来のものより軽く安いものを使用できるようになり、乗用田植機の軽量化及びコストダウンを図ることができる。また従来に比べ植付部１５を走行車１に最も接近配置できるようになり、走行車１の運転席１３に座った状態で植付部１５側の各種操作レバーを操作するときの操作性を向上させることができると共に、機体全長の短縮により走行性能も向上させることができる。
【００５１】
また、植付部１５を前後方向に向くローリング支点軸９７回りで左右に傾けることができるように走行車１に連結した乗用田植機において、走行車１に対して植付部１５がある範囲を越えて傾かないようにするための干渉部を左右傾き方向それぞれに複数箇所ずつ設けており、各干渉部Ａ，Ｂ，Ｃ，Ｄ，Ｅにかかる力を従来に比べ小さくし、干渉部品が従来のものより軽く安いものを使用できるようになり、乗用田植機の軽量化及びコストダウンを図ることができる。
【００５２】
また、植付部１５を前後方向に向くローリング支点軸９７回りで左右に傾けることができるように走行車１に連結した乗用田植機において、走行車１に連結するヒッチ２４と、植付部１５の植付フレーム２０におけるローリング支点軸９７と直交する部分である横フレーム４５に連結するローリング支持部材である中間ボス１６０とを、ローリング支点軸９７により連結し、横フレーム４５に中間ボス１６０を複数箇所で連結させる連結部材であるヒッチ台１６１を、走行車１に対して植付部１５が左または右のある傾き姿勢に傾いたとき、ヒッチ２４と複数箇所で干渉させるように構成しており、ヒッチ２４とヒッチ台１６１との各干渉部Ａ，Ｂ，Ｃ，Ｄ，Ｅにかかる力を従来に比べ小さくし、ヒッチ２４とヒッチ台１６１が従来のものより軽く安いものを使用できるようになり、乗用田植機の軽量化及びコストダウンを図ることができる。
【００５３】
図２９、図３０は植付部１５側のローリング支点軸枢支部の変形例を示すもので、該植付部１５側のローリング支点軸枢支部１５９Ａは、ヒッチ台１６１を使用することなく、植付部１５のローリング支持部材である中間ボス１６０を、この中間ボス１６０と直交する方向の植付フレーム２０となる横フレーム４５の左右中央部または左右略中央部に、平面視で中間ボス１６０と横フレーム４５が直角に交差するように、前後方向に向けて水平または略水平姿勢で横フレーム４５に連結している。そして、中間ボス１６０と横フレーム４５との連結にヒッチ台１６１を使用しない場合、中間ボス１６０を横フレーム４５に接触させるだけでは、中間ボス１６０を横フレーム４５に一点でしか溶接固定できず、接合強度が不足する。それを補うため中間ボス１６０の外面に沿う切欠部１６７を横フレーム４５の左右中央部上面または左右略中央部上面に設け、該切欠部１６７に上方から中間ボス１６０を接合させ、切欠部１６７の周囲で中間ボス１６０の外面と横フレーム４５の外面を溶接固定し、溶接面積を稼ぎ必要な接合強度を得るように構成している。
【００５４】
横フレーム４５には植付駆動軸５１が挿通されているため、切欠部１６７の深さは、横フレーム４５の内部に喰込む中間ボス１６０の底面と植付駆動軸５１とが接触しない深さに形成している。
【００５５】
また図中１６８，１６９は、ヒッチ台１６１を有さない植付部１５側のローリング支点軸枢支部１５９Ａにおける中間ボス１６０の前後部から一体に立上げられ、干渉部Ｄ，Ｅの一方となるヒッチ２４側のローリング支点軸枢支部１５１におけるブラケット１５２上面の内面、すなわち接合空間１５３の天井面に、走行車１に対して植付部１５が左上がりまたは右上がりに所定角度傾いたとき当接（干渉）する干渉部Ｄ，Ｅの他方、すなわち植付部１５側のローリング支点軸枢支部１５９における前後連結面１６２，１６３の上部固着部１６２ｂ，１６３ｂと同じ作用を呈する前後ストッパーであり、このストッパー１６８，１６９の上端左右側部が、走行車１に対して植付部１５が左上がりまたは右上がりに所定角度傾いたとき、ヒッチ２４側のローリング支点軸枢支部１５１におけるブラケット１５２上面の内面、すなわち接合空間１５３の天井面に当接（干渉）して、植付部１５の左右傾け動作（ローリング）を所定の範囲に規制するように構成している。
【００５６】
上記から明らかなように、植付部１５のローリング支持部材である中間ボス１６０と直交する方向の植付フレームである横フレーム４５に、中間ボス１６０の外面に沿う切欠部１６７を設け、該切欠部１６７に中間ボス１６０を取付けており、中間ボス１６０を横フレーム４５に直接溶接手段などによって取付けることができ、従来のような連結部材が不要になり、乗用田植機の軽量化及びコストダウンを図ることができる。
【００５７】
【発明の効果】
【００５８】
以上実施例から明らかなように請求項１に記載の発明は、前後方向に向くローリング支点軸９７回りで植付部１５を左右に傾けることができるように走行車１に連結した乗用田植機において、走行車１に連結するヒッチ２４と、植付部１５の植付フレーム２０におけるローリング支点軸９７と直交する部分である横フレーム４５に連結するローリング支持部材である中間ボス１６０とを、ローリング支点軸９７により連結し、横フレーム４５に中間ボス１６０を複数箇所で連結させる連結部材であるヒッチ台１６１を、走行車１に対して植付部１５が左または右の傾き姿勢に傾いたとき、ヒッチ２４と複数箇所で干渉させるように構成したもので、ヒッチ２４とヒッチ台１６１との各干渉部Ａ，Ｂ，Ｃ，Ｄ，Ｅにかかる力を従来に比べ小さくし、ヒッチ２４とヒッチ台１６１が従来のものより軽く安いものを使用できるようになり、乗用田植機の軽量化及びコストダウンを図ることができる効果を奏するものである。
【図面の簡単な説明】
【図１】乗用田植機の全体側面図
【図２】乗用田植機の全体平面図
【図３】植付部の側面図
【図４】植付部の平面図
【図５】植付部の平面説明図
【図６】植付部の概略正面図
【図７】植付フレーム部の正面図
【図８】植付フレーム部の側面図
【図９】植付フレーム部の平面断面図
【図１０】植付フレーム左側平面図
【図１１】植付フレーム右側平面図
【図１２】植付フレームの左側断面説明図
【図１３】植付フレームの部分斜視説明図
【図１４】苗取出し部の説明図
【図１５】苗送りケース部の断面説明図
【図１６】変速軸部の説明図
【図１７】切換機構の説明図
【図１８】植付爪ユニットクラッチ部の説明図
【図１９】植付爪ユニットクラッチ部の外観説明図
【図２０】サイドバンパ部の説明図
【図２１】ローリング支点部の正面図
【図２２】ローリング支点部の断面背面図
【図２３】ローリング支点部の側面図
【図２４】ローリング支点部の断面側面図
【図２５】ローリング支点部の平面図
【図２６】ローリング支点部の分解側面図
【図２７】ローリング規制を示すローリング支点部の断面背面図
【図２８】ローリング規制を示すローリング支点部の側面図
【図２９】変形例の植付部側のローリング支点軸枢支部の外観斜視図
【図３０】変形例の植付部側のローリング支点軸枢支部の断面側面図
【符号の説明】
１走行車
１５植付部
２０植付フレーム
２４ヒッチ
４５横フレーム
９７ローリング支点軸
１６０中間ボス（ローリング支持部材）
１６１ヒッチ台（連結部材）
１６７切欠部
Ａ，Ｂ，Ｃ，Ｄ，Ｅ干渉部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a riding rice transplanter configured with a traveling vehicle and a planting unit.
[0002]
[Prior art]
The planting part of the riding rice transplanter can be held horizontally by the rolling control mechanism even if the traveling vehicle is tilted left and right. This rolling control mechanism is connected to the traveling vehicle so that the planting part can be tilted to the left and right around the rolling fulcrum axis in the front-rear direction (traveling direction), and detects the right and left inclination of the planting part This is to control the actuator that tilts the planting part to the left and right so that the detected value becomes the value when the planting part is not tilted to the left and right but is horizontal. Other than this, the planting part connected to the traveling vehicle so that it can be tilted left and right around the rolling fulcrum axis in the front-rear direction (traveling direction) is simply held in a horizontal position by a rolling correction spring. there were.
[0003]
And the concrete structure of the rolling fulcrum part of the latter planting part is shown by Unexamined-Japanese-Patent No. 2000-41429. This is because a side-viewing gate-shaped bracket that opens the lower surface side is attached to the lower end of the hitch that is attached to the rear of the traveling vehicle via an elevating link mechanism, and there is a hole for inserting the rolling fulcrum shaft on the front and rear surfaces of this bracket. On the other hand, a connecting member is extended forward from a portion perpendicular to the rolling fulcrum shaft of the planting frame that constitutes the planting part by assembling a seedling stand, a planting claw, and the like. A rolling support member in the form of a sleeve to which the rolling fulcrum shaft is inserted is attached. The rolling support member is fitted inside the bracket, the hole position of the bracket and the hole position of the rolling support member are aligned, and the bracket and the rolling support member are rolled. By inserting the fulcrum shaft, the planting part is connected to the traveling vehicle so that it can be tilted left and right around the rolling fulcrum shaft facing in the front-rear direction. It has become way.
[0004]
Also, when the planting part is tilted to the left or right with respect to the traveling vehicle, the planting part tilts horizontally (rolling) by causing the hitch and the connecting member to interfere (contact) at a single location. ) To a certain extent. That is, the rolling regulation of the planting part is performed.
[0005]
[Problems to be solved by the invention]
However, if the rolling restriction of the planting part is performed by interference (contact) of only one place between the hitch and the connecting member as described above, the force applied to the interference part becomes extremely large, and the interference part may be dent-deformed. There is. When the interference part is recessed and deformed, the planting part tilts to the left and right beyond the rolling regulation range, and the hitch and other components of the planting part hit each other, which may damage them. In order to prevent such an inconvenience, conventionally, it has been necessary to make the hitch and the connecting member thicker, such as increasing the thickness of the hitch and the connecting member, resulting in an increase in weight and cost.
[0006]
Accordingly, the main object of the present invention is to provide a riding rice transplanter that is designed to perform rolling regulation of the planting part so as not to cause an increase in weight and cost as described above, and to achieve weight reduction and cost reduction. Yes.
[0007]
[Means for Solving the Problems]
[0008]
In order to achieve the above object, a riding rice transplanter according to claim 1 of the present invention provides: Around the rolling fulcrum axis in the front-rear direction Planting In a passenger rice transplanter that is connected to a traveling vehicle so that it can be tilted to the left and right, a hitch that is connected to the traveling vehicle and a rolling support member that is connected to a portion perpendicular to the rolling fulcrum shaft of the planting frame of the planting part, A connecting member that connects with a rolling fulcrum shaft and connects the rolling support member to the planting frame at a plurality of locations, with the planting part left or Right tilt When it leans to the posture, it is configured to interfere with the hitch at multiple locations, and this feature structure reduces the force applied to each interference part between the hitch and the connecting member compared to the conventional hitch. The connection member can be made lighter and cheaper than the conventional one, and the riding rice transplanter can be reduced in weight and cost.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view of a riding rice transplanter, and FIG. 2 is a plan view thereof. In FIG. 1, reference numeral 1 denotes a traveling vehicle on which an operator is boarded. A front wheel 6 for paddy field traveling is supported via a front axle case 5 in front of the case 4, and a rear wheel 8 for paddy field traveling is supported by a rear axle case 7 at the rear of the mission case 4. The spare seedling platforms 10 are attached to both sides of the bonnet 9 covering the engine 2 and the like, and the transmission case 4 is covered with the vehicle body cover 11 on which the operator is boarded. The steering handle 14 is provided at the rear of the hood 9 in front of the driver seat 13.
[0010]
In the figure, reference numeral 15 denotes a planting part having a seedling mounting table 16 for four-row planting and a plurality of seedling planting claws 17, and the like. The planting frame 20 is supported by the planting frame 20 through the lower rail 18 and the guide rail 19 so as to be slidable in the left and right directions, and the planting frame 20 supports a rotary case 21 that rotates at a constant speed in one direction. A pair of nail cases 22 are arranged at symmetrical positions around the core, and the seedling planting nails 17 are attached to the tips of the nail cases 22. In addition, left and right side frames 23 are erected on the left and right ends of the front portion of the planting frame 20 to support the seedling mounting table 16, and a hitch 24 at the center of the front portion of the planting frame 20 includes a top link 25 and a lower link 26. It connects with the traveling vehicle 1 via the raising / lowering link mechanism 27, the hydraulic raising / lowering cylinder 28 provided in the traveling vehicle 1 is connected with the lower link 26, and the planting part 15 is connected via the raising / lowering link mechanism 27 when the hydraulic raising / lowering cylinder 28 is driven. While raising and lowering, when the planting part 15 is lowered, one seedling is taken out from the seedling mount 16 that is slid back and forth by the seedling planting claw 17 and continuously seeded.
[0011]
In the figure, 29 is a main speed change lever, 30 is a seedling lever that enables operations such as travel stop at the position where the aircraft is lowered as well as the boarding position, 31 is a planting lift lever, and 32 is a main clutch. Pedal, 33 left and right brake pedal, 34 center float for leveling two strips, 35 left and right side float for leveling one strip, 36 side fertilizer for four strips, 37 for rear wheel 8 Auxiliary wheels to be deployed on the outside.
[0012]
The side strip fertilizer 36 is a turbo that discharges the fertilizer through a flexible conveying hose 41 to a fertilizer hopper 38 for containing fertilizer, a fertilizer feed case 39, and a side strip groover 40 of the center float 34 and the side float 35. A blower-type blower 42 and a cylindrical air tank 43 are provided, and the blower 42 is attached to the right end of the air tank 43, and four sets of four fertilizer feed cases 39 are arranged on the upper side of the air tank 43. The upper end of the seedling stage 16 is arranged close to the rear side.
[0013]
As shown in FIGS. 3 to 12, the planting frame 20 that also serves as a transmission case for the planting portion 15 connects the left and right vertical frames 44a and 44b made of pipes for two strips and the front ends of the left and right vertical frames 44a and 44b. A cross frame joint (cross pipe joint) 46 formed by bulging is welded and fixed to the rear ends of the vertical frames 44a and 44b, and the rotary case 21 is connected via the rotary shaft 47. The frame joint 46 is rotatably supported, and cruciform frame joints (cross pipe joints) 48a and 48b formed by bulging are welded and fixed to the vertical frames 44a and 44b and the horizontal frame 45, and the vertical frames 44a, The light-weight planting frame 20 is formed at a low cost by integrally connecting the 44b and the horizontal frame 45 to a U-shape in plan view that opens to the rear of the machine body.
[0014]
Further, the planting input shaft 49 is projected from the front surface of the right frame joint 48 b which is the right corner of the front end of the planting frame 20, and the driving force from the PTO shaft of the mission case 4 is transmitted through the universal joint shaft 50. 49, the planting input shaft 49 is linked to the right end of the planting drive shaft 51 inserted into the horizontal frame 45 via bevel gears 49a, 52, and the planting claw is inserted into the left and right vertical frames 44a, 44b. The front end of the drive shaft 53 is connected to the left and right ends of the planting drive shaft 51 via bevel gears 52 and 54 and a safety clutch 55, and the planting claw is driven to the rotary shaft 47 via bevel gears 56a and 56b and a planting claw unit clutch 57. The rear end of the shaft 53 is interlocked to drive the seedling planting claw 17.
[0015]
Further, a seedling feed shaft 58 for laterally feeding the seedling mounting table 16 in the horizontal direction and vertically feeding the seedlings on the seedling mounting table 16 is connected to the left end of the planting drive shaft 51 via a seedling feeding case 59 made of aluminum die cast. The flange portion 61 on one end side of the seedling feeding case 59 is bolted and fixed to the welding flange 60 provided at the leftward joint end portion of the left frame joint 48a, and the seedling feeding is performed on the other end side of the seedling feeding case 59. The left end of the shaft 58 is inserted and supported, and a speed change mechanism 64 formed by two sets of switching gears 62 and 63 for high and low speed change is interposed between the planting drive shaft 51 and the seedling feed shaft 58 in the seedling feed case 59, The left half of the seedling feed shaft 58 is provided on the seedling vertical feed camshaft 65 and the right half is provided on the seedling horizontal feed screw shaft 66 with respect to the approximate center in the left-right direction. Transverse feed of the seedling table 16 and on the seedling table 16 Performing the longitudinal feed of.
[0016]
The brackets 68 and 69 on the rear end upper surface of the center float 34 and the rear end upper surfaces of the left and right side floats 35 are pivotally supported and connected to the planting depth adjustment fulcrum shaft 67 through the planting depth adjustment links 70 and 71. Then, a change in the float inclination angle (planting depth) is detected by the elevating link 72 connected to the front end of the center float 34, and the planting depth adjusting lever 73 is fixed to the planting depth adjusting fulcrum shaft 67. To adjust the standard planting depth.
[0017]
L-shaped left and right side bumpers 74 are provided on the left and right ends of the planting depth adjustment fulcrum shaft 67 so as to be foldable outwardly through mounting members 75.
[0018]
As shown in FIGS. 8, 10, and 11, the base ends of the left and right marker support stays 77 that support the left and right muscle pulling marker 76 in a freely foldable (undulating) manner are welded and fixed to the outer upper surfaces of the frame joints 48 a and 48 b. The marker support stay 77 is formed of an L-shaped pipe, and the longitudinal stay portion 77a in the front-rear direction is welded and fixed to the substantially the same height surface in the longitudinal direction at the approximate center of the frame joints 48a and 48b. Facing the vertical frames 44a and 44b to the left and right outwards, the bracing marker 76 is supported by the mounting shaft 78 at the tip of the lateral stay portion 77b via the marker base 79 so as to be foldable, and the left marker support stay 77 The lateral stay portion 77b is positioned in front of the seedling feeding case 59 to function as a bumper that protects the seedling feeding case 59.
[0019]
Also, as shown in FIG. 13, the left and right marker support stays 77 are welded and fixed to the inner surfaces of the left and right reinforcing members 80 and 81 for attaching the base ends of the left and right side frames 23 to the frame joints 48a and 48b. Thus, the support strength of the side frame 23 and the marker support stay 77 is improved.
[0020]
As shown in FIG. 14, a seedling removal adjustment plate 83 that adjusts the amount of seedling removal by moving the seedling extraction plate 82 at the lower end of the seedling mounting table 16 up and down is provided on the guide member 84 of the planting frame 20 via the guide rod 85. An engagement plate 87 that is supported in a vertically movable manner and engages with a hook 86 of the seedling adjustment plate 83 is provided on the seedling adjustment shaft 88 in the left-right direction, and is connected to the left end side of the seedling adjustment shaft 88. By adjusting the adjustment lever 89, the amount of seedlings for one stock taken out by the seedling planting claws 17 is adjusted. The bearing plate 90 fixed to the seedling feeding case 59 and the right reinforcing member 81 are provided with a seedling amount adjusting shaft 88. The left and right ends of the horizontal shaft portion 88a are rotatably supported, and the left end side of the horizontal shaft portion 88a is bent forward at approximately 90 degrees outward from the seedling feeding case 59 to form a vertical axis portion 88b in the front-rear direction. The front end of the vertical axis 88b is folded inward at approximately 90 degrees in front of the seedling feeding case 59. Then, an L-shaped seedling amount adjusting lever 89 base end is fixed to the lever attaching portion 88c with two bolts 91, and the tip of the seedling amount adjusting lever 89 is attached to the lever guide 92. Via the left front wheel 8 and its auxiliary wheel 37 so as to face the left rear wheel 8 and the auxiliary wheel 37. The attachment portion 88c functions as a bumper that surrounds and protects the front and rear and the outside of the seedling feeding case 59 and protects the seedling feeding case 59, and the leftmost planting hose 41 in the gap 93 between the seedling feeding case 59 and the seedling collection amount adjusting shaft 88. Perform positioning.
[0021]
The hitch 24 has upper and lower link shafts 94, 95 for connecting the top link 25 and the lower link 26, and a sleeve-like rolling support member 160 provided at the approximate center of the horizontal frame 45 of the planting frame 20 is a rolling fulcrum at the lower end of the hitch 24. The hydraulic rolling cylinder 99 is attached to a mounting seat 98 at the upper end of the hitch 24, and the tip of the piston rod 100 of the hydraulic rolling cylinder 99 is connected to the fixed bracket 101 at the upper end of the right side frame 23. A gear pump 102 that reciprocates the double-acting hydraulic rolling cylinder 99, a reversible electric motor 103 that drives the gear pump 102 forward and reverse, and an oil tank 104 are integrally provided on the hydraulic rolling cylinder 99, and are mounted on the upper surface of the mounting seat 98. The receiving plate 105 to be fixed and the left and right ends When a rolling correction spring 106 is stretched between the brackets and the pendulum type rolling sensor 108 provided on the sensor base 107 of the horizontal frame 45 on the left side of the hitch 24 detects the right and left inclination of the planting portion 15, the hydraulic rolling cylinder The piston rod 100 is controlled to advance and retreat, and the planting portion 15 is swung left and right (tilted) around the rolling fulcrum shaft 97 to maintain the planting portion 15 horizontally.
[0022]
Further, a seedling feed shaft support member 109 that is welded and fixed to the horizontal frame 45 is provided on the right side of the hitch 24, and the seedling feed shaft support member 109 and the fixed bracket 101 at the upper end of the right side frame 23 are reinforced and connected by an oblique stay 110. In the lightest structure, the rigidity of the right side frame 23 is improved and the rolling performance of the planting portion 15 is ensured.
[0023]
Further, the seedling feed shaft support member 109 rotatably supports substantially the middle of the seedling feed shaft 58. A bearing 112 is provided between the bearing plate 111 fixed to the right marker support stay 77 and the seedling feed shaft support member 109. The seedling horizontal feed screw shaft 66 is supported at both ends, the right end of the seedling vertical feed cam shaft 65 is connected to the left end of the seedling stand horizontal feed screw shaft 66 via the shaft joint 113, and the left end of the seedling vertical feed cam shaft 65 is set to the seedling. The seedling vertical feed cam shaft 65 and the seedling table horizontal feed screw shaft 66, which are connected to and supported by the feed case 59 and divided into the left and right sides, are both supported to improve the support strength. The right end of the seedling vertical feed cam shaft 65 is connected to the seedling horizontal feed screw shaft 66 with the same axis to improve the seedling vertical feed accuracy. The seedling vertical feed cam shaft 65 is made of a steel hollow pipe, and the seedling horizontal feed screw shaft 66 is made of solid iron material. The seedling feed case 59 and the seedling vertical feed cam shaft 65 are placed on the left side of the left and right centers of the machine body. The seedling horizontal feed screw shaft 66 having a large weight is distributed and arranged on the right side of the right and left center of the left and right to balance the right and left of the planting part 15.
[0024]
In addition, a slider 114 is screwed to the seedling horizontal feed screw shaft 66, and the slider 114 is connected to the seedling mounting table 16 via a slider receiver 115 so that the seedling table horizontal feed screw shaft 66 is unidirectional. When rotating, the seedling mounting table 16 is reciprocated left and right, and the seedling vertical feed cam shaft 65 is provided with a left and right vertical feeding cam 116, and when the seedling mounting table 16 moves to the left and right moving end, the vertical feeding to the driven cam 117 is performed. The longitudinal feed roller shaft 119 is rotated in one direction via the one-way clutch 118 by contacting the cam 116, and the longitudinal feed rollers 121 of the pair of upper and lower longitudinal feed roller shafts 119, 120 provided on the lower end side of the seedling mount 16. , 122 is moved in the lower end direction by one seedling of the vertical feed belt 123 wound around.
[0025]
As shown in FIGS. 15 to 17, in the frame joint 48 a for connecting the seedling feeding case 59, a welding flange 60 for mounting and fixing the seedling feeding case 59 is provided at the joint end on the left side of the frame joint 48 a. A spigot fitting portion 124 that fits to the joining end portion of the frame joint 48 a that protrudes for a certain length is provided on one side inner surface of the seedling feeding case 59, and a tapered surface 125 is formed at the outer end of the spigot fitting portion 124, An O-ring 126 is interposed between the taper surface 125 and the frame joint 48a, so that the airtight maintenance between the frame joint 48a and the seedling feeding case 59 can be achieved with a simple structure and at low cost when the welding flange 60 and the flange 61 are fastened by the bolt 127. Do.
[0026]
The seedling feeding case 59 is provided with a transmission shaft 128 separate from the planting drive shaft 51, a spline hole 129 is formed inside the bevel gear 52, and the left end of the planting drive shaft 51 and the right end of the transmission shaft 128 are formed in the spline hole 129. And the transmission shaft 128 is integrally connected to the planting drive shaft 51 so that the transmission shaft 128 can be easily and integrally removed when the seedling feed case 59 is removed.
[0027]
Further, a bearing 130 is interposed between the frame joint 48a and the bevel gear 52 so that the bevel gear 52 is rotatably supported inside the leftward joint end portion of the frame joint 48a, and the frame joint 48a joint end portion outside the bearing 130 position. The welding flange 60 is welded and fixed to the outer peripheral surface, and the inner diameter b of the welding flange 60 mounting portion is larger (a <b) than the inner diameter a of the bearing 130 fitting portion at the joint end of the seedling feed case 59 of the frame joint 48a. Thus, even if the joint end portion of the seedling feeding case 59 of the frame joint 48a is slightly deformed by the welding distortion of the welding flange 60, the assembly of the bearing 130 is not adversely affected.
[0028]
Further, the seedling feeding case 59 is formed in an L shape having a vertical case portion 59a and a horizontal case portion 59b, a flange portion 61 is formed at the right end of the horizontal case portion 59b, and switching gears 62, 63 are provided on the vertical case portion 59a. The speed change mechanism 64 to be formed is a structure in which a speed change switching mechanism 131 is incorporated in the lateral case portion 59b. The change gears 62 and 63 are drive side gears 62a and 63a that are idled and supported on the speed change shaft 128, and the left end of the seedling vertical feed cam shaft 65 And a gear change mechanism 131 is embedded in the key groove 132 of the transmission shaft 128 and the tip thereof is selected by the force of the seat spring 133 as the key groove 134 of the drive side gears 62a and 63a. The shift key 135 is engaged with the shift key 135 and the switch lever 138 is connected to the shift key 135 via the shift ring 136 and the shifter 137. The left operation part 138a of over 138 is projected to the front side of the seedling feed case 59 left outside, for switching the seedling feeding speed of the high and low speed by the left and right direction of the push-pull operation of the switching lever 138.
[0029]
Further, the switching gears 62, 63 are made lighter by forming the driving gears 62a, 63a on the side engaged with the shift key 135 from a metal material such as iron and the other driven gears 62b, 63b from a resin material. Improve both durability.
[0030]
As shown in FIGS. 18 and 19, the planting frame 20 is compactly assembled with bevel gears 49a, 52, and 54 in the front frame joints 48a and 48b, and bevel gears 56a, 56b and 56b are compactly incorporated into the rear frame joint 46. The planting claw unit clutch 57 is incorporated so as to simplify the structure and reduce the cost. The planting claw unit clutch 57 is provided with a fixed clutch portion 139 on a bevel gear 56b that is idled and supported on the rotary shaft 47, and a rotary shaft 47. The movable clutch part 141 is formed on each of the sliding bodies 140 to be slidably fitted to the left and right sides, and the fixed clutch part 139 and the movable clutch part 141 are normally coupled by pressing the sliding body 140 by the clutch spring 142 (with the clutch engaged). Clutch operation for retracting the sliding body 140 against the force of the clutch spring 142. The member 143 is provided on the frame joint 46 so as to be able to advance and retreat, and the clutch operating member 143 is connected to a unit clutch lever (not shown) disposed on the back side of the seedling table 16 through the lever 144 and the like. The planting claw unit clutch 57 is turned on and off by operation.
[0031]
As shown in FIGS. 20 (1) and 20 (2), the side bumper 74 is vertically movable with the bumper bent vertical portion 74a vertically movable to a U-shaped attachment member 75 fixed to both ends of the planting depth adjustment fulcrum shaft 67. A compression spring 146 is interposed between the spring seat 145 and the mounting member 75 of the bumper bent vertical portion 74a that is inserted through the mounting member 75 and protrudes downward from the mounting member 75, and is brought into contact with the left end surface and the front surface of the mounting member 75. The position restricting plate 147 having a shape is fixed to the bumper bent vertical portion 74a, and a stopper portion 148 for preventing the position restricting plate 147 from rotating backward is provided on the attachment member 75, and the position restricting plate 147 and the left end surface of the attachment member 75 are provided. The bumper bent horizontal portion 74b is projected in the extending direction of the planting depth adjustment fulcrum shaft 67 to protect the seedling extraction plate 82 and the like, while against the compression spring 146, the side bumper 74 Pull up upward and turn the bumper bent horizontal portion 74b forward approximately 90 degrees to reduce the width of the fuselage when it is in the bumper storage position where the position restricting plate 147 contacts the front surface of the mounting member 75. Easily load and store in the garage.
[0032]
The internal transmission mechanism of the seedling feed case 59 has a two-shaft configuration of a seedling vertical feed cam shaft 65 and a transmission shaft 128, and two sets of switching gears 62 and 63 and a simple transmission mechanism 64 and a transmission switching mechanism 131 of a shift key 135 are fed. Due to the structure incorporated in the case 59, the seedling feeding case 59 is formed in a small and light weight at a low cost while keeping the mold cost low, and the case lid 150 on the left side surface fixed to the case body side of the seedling feeding case 59 via a bolt 149. The switch gears 62 and 63 can be easily replaced and the internal transmission mechanism can be easily inspected to improve maintainability.
[0033]
Further, when the lateral case portion 59b of the seedling feeding case 59 is formed in an elongated shape, the distance between the vertical case portion 59a and the flange portion 61 is increased, and tools are used in the operation of attaching and detaching the bolt 127. Is easy to insert and remove the seedling feeding case 59 by easily inserting tools up to the position of the bolt 127 to improve maintainability.
[0034]
In addition to reducing the weight and cost of the riding rice transplanter by the configuration of each part in the planting unit 15 described above, the configuration of the rolling fulcrum of the planting unit 15 which is the gist of the present invention also reduces the weight of the riding rice transplanter. In order to reduce the cost, the configuration of the rolling fulcrum will be described in detail below with reference to FIGS.
[0035]
A longitudinally long hitch 24 is connected to the rear of the traveling vehicle 1 via a lifting link mechanism 27 on the left and right center line of the airframe or substantially on the left and right of the airframe, and a cross section facing the front and rear direction (airframe traveling direction) at the lower end of the hitch 24 A rolling horizontal axis or a substantially horizontal axis, that is, a rolling fulcrum shaft 97, is attached to the front part of the planting frame 20 that constitutes the planting part 15 by assembling the seedling mounting table 16 and the seedling planting claws 17 and the like. The left and right center part or the left and right center part of the horizontal frame 45 that is the left and right center part or the substantially right and left center part of the planting frame 20 in the direction orthogonal to the fulcrum shaft 97 is pivotally supported around the rolling fulcrum shaft 97, Further, the planting portion 15 can be elastically held in a horizontal posture or a substantially horizontal posture by the left and right rolling correction springs 106, and the planting portion 15 can be tilted left and right around the rolling fulcrum shaft 15. In this way, the detection value of the rolling sensor 108 that is connected to the traveling vehicle 1 and detects the right and left inclination of the planting unit 15 is set to a value when the planting unit 15 is level without being tilted to the left and right. By actuating the actuator that tilts the attaching portion 15 left and right, that is, the hydraulic rolling cylinder 99, the planting portion 15 can be held horizontally or substantially horizontally even when the traveling vehicle 1 is inclined left and right. That is, it is configured to perform rolling control.
[0036]
The hitch 24 is vertically long and has a tapered shape with the lower part wide when viewed from the side, and the cross section of the hitch 24 is formed in a U-shape with the open part facing rearward in plan view. A rolling fulcrum shaft support portion 151 on the hitch 24 side is provided at the lower end portion of the hitch 24. The rolling fulcrum shaft pivot support portion 151 on the hitch 24 side is fixed to the left and right side walls of the lower end portion of the hitch 24 by welding and fixing a bracket 152 having a side-view portal shape with the open portion facing downward. Are closed by the left and right side walls of the hitch 24, and the upper surface and the front and rear surfaces are closed by the bracket 152 to form a joint space 153 with the planting portion 15 in which only the lower surface is opened, and the front and rear surfaces of the joint space 153 Short front and rear bosses (sleeves) 154 and 155 having cylindrical shaft holes through which the rolling fulcrum shafts 97 are inserted perpendicularly to the front and rear surfaces of the bracket 152 and the front boss 154 in front. Through the front wall of the hitch 24, the front end protrudes to the front side of the hitch 24, the front end of the front boss 154 is welded and fixed to the front wall of the hitch 24, and the rear side An intermediate portion of the boss 155 is fixed to the rear surface of the bracket 152 by welding, and ends of the front and rear bosses 154 and 155 are protruded inward from the front and rear surfaces of the joint space 153, and the rolling fulcrum shaft 97 is moved from the front of the hitch 24 to the front boss. 154, and then inserted into the rear boss 155 so that the rolling fulcrum shaft 97 is inserted into and supported by the lower end portion of the hitch 24 with the joint space 153 being penetrated.
[0037]
Further, a stopper plate 156 is welded and fixed to the end of the rolling fulcrum shaft 97 opposite to the insertion start end, and the rolling fulcrum shaft 97 is inserted from the front of the hitch 24 into the front boss 154 and then the rear boss 155 to perform rolling. When the fulcrum shaft 97 is inserted through and supported by the lower end portion of the hitch 24 with the joint space 153 being penetrated, the stopper plate 156 is brought into contact with the front wall of the hitch 24 to restrict the insertion of the rolling fulcrum shaft 97, and The stopper plate 156 is fastened and fixed to the front wall of the hitch 24 via bolts 157 and nuts 158 so that the rolling fulcrum shaft 97 is prevented from being pulled out and stopped.
[0038]
On the other hand, the rolling fulcrum pivot 159 on the planting part 15 side is a front part of the planting frame 20 that constitutes the planting part 15 by assembling the seedling mounting table 16, the seedling planting claw 17, and the like, and is also rolling. It is provided in the left and right central part or the left and right central part of the horizontal frame 45 which is the left and right central part or the left and right substantially central part of the planting frame 20 in the direction orthogonal to the fulcrum shaft 97. The rolling fulcrum shaft support portion 159 on the planting portion 15 side includes an intermediate boss (sleeve) 160 that is a rolling support member, and the intermediate boss 160 at the left and right central portion or the left and right central portion of the horizontal frame 45. Is formed with a hitch base 161 that is a connecting member for connecting together so as to wrap at least partly with the horizontal frame 45 in plan view.
[0039]
The intermediate boss 160 is formed to have a length that can be fitted in series in the front-rear direction between the front and rear bosses 154, 155 of the joint space 153 of the rolling fulcrum shaft support portion 151 on the hitch 24 side, and the rolling fulcrum shaft 97 is It has a cylindrical shaft hole to be inserted.
[0040]
The hitch stand 161 is in a state in which the intermediate boss 160 is in contact with the right and left central portion or the substantially right and left central portion of the horizontal frame 45 that is the planting frame 20 in a direction orthogonal to the intermediate boss 160 and in plan view. The intermediate boss 160 and the horizontal frame 45 are connected to the horizontal frame 45 at a plurality of positions in a horizontal or substantially horizontal posture in the front-rear direction so that they intersect at a right angle.
[0041]
That is, the hitch base 161 has front and rear connection surfaces 162 and 163 which are a plurality of vertical connection surfaces opposed at least in the longitudinal direction of the body, and the front and rear connection surfaces 162 and 163 are connected to the front and rear outer surfaces of the horizontal frame 45. Standing vertically, the lower parts of the front and rear connecting surfaces 162 and 163 are opposed to each other in the longitudinal direction of the machine body with the horizontal frame 45 interposed therebetween, and the upper parts of the front and rear coupling surfaces 162 and 163 are opposed to each other above the horizontal frame 45 in the longitudinal direction of the machine body. . Further, the front and rear connecting surfaces 162 and 163 are formed such that the lower part sandwiching the horizontal frame 45 is wider than the horizontal width of the hitch 24, and the upper part protruding upward from the horizontal frame 45 is the joint space of the rolling fulcrum shaft support part 151 on the hitch 24 side. The lower fixing portions 162a and 163a are formed to have a horizontal width and a height that can be fitted into the 153 and through which the intermediate boss 160 can penetrate, and the lower portions of the front and rear connecting surfaces 162 and 163 are fixed to the horizontal frame 45 by welding. The upper portions of the front and rear connecting surfaces 162 and 163 are upper fixing portions 162b and 163b for fixing the intermediate boss 160 by welding, and the narrow upper fixing portions 162b and 163b are formed from the left and right intermediate portions of the wide lower fixing portions 162a and 163a. It extends integrally, and the left and right side portions of the lower fixing portions 162a and 163a are extended to the left and right of the upper fixing portions 162b and 163b, and the lower fixing portion is fixed. Upward end surfaces 162c and 163c are formed on the left and right side portions of the middle part of the front and rear connecting surfaces 162 and 163, which are the boundaries between the 162a and 163a and the upper fixing portions 162b and 163b. The upward end surfaces 162c and 163c It is formed in accordance with the height of the highest part (the height of one point on the upper side of the two points where the vertical line passing through the axis of the horizontal frame 45 and the outer peripheral surface of the horizontal frame 45 intersect). The intermediate boss 160 is passed through the upper fixing portions 162b and 163b of the front and rear connecting surfaces 162 and 163 protruding above the horizontal frame 45 at a right angle so that the bottom surface of the intermediate boss 160 is in contact with the horizontal frame 45. The front and rear portions of the intermediate boss 160 are welded and fixed to the upper fixing portions 162b and 163b of the front and rear connecting surfaces 162 and 163, and the contact portion of the intermediate boss 160 with the horizontal frame 45 is fixed to the horizontal frame 45 by welding. The boss 160 is in contact with the right and left central part or the substantially right and left central part of the horizontal frame 45 that is the planting frame 20 in a direction orthogonal to the intermediate boss 160, and the intermediate boss 160 and the horizontal frame in plan view. It is connected to the horizontal frame 45 at a plurality of locations (three locations) in a horizontal or substantially horizontal posture in the front-rear direction so that 45 intersects at right angles.
[0042]
The front and rear connecting surfaces 162 and 163 are integrally formed by bending a single flat iron plate in accordance with the cross-sectional shape of the horizontal frame 45 as shown. That is, a flat steel plate is bent into a U shape with the same curvature as the outer peripheral surface of the horizontal frame 45 having a circular cross section to form a hitch base 161 in a U shape in a side view, and a U-shaped hitch base 161 in a side view. The front and rear surfaces facing each other are front and rear connection surfaces 162 and 163. Then, the U-shaped hitch base 161 is externally fitted to the horizontal frame 45 from below, and the horizontal frame 45 is held by the bottom of the hitch base 161 (holding state), and the hitch base is attached to the horizontal frame 45. 161, the contact edge of the hitch base 161 with respect to the outer peripheral surface of the horizontal frame 45 is welded and fixed to the horizontal frame 45, and the front and rear connecting surfaces 162, 163 from the front outer surface and the rear outer surface of the horizontal frame 45 as described above. The front and rear connecting surfaces 162 and 163 are opposed to each other in the longitudinal direction with the horizontal frame 45 interposed therebetween, and the upper and lower coupling surfaces 162 and 163 are opposed to each other above the horizontal frame 45 in the longitudinal direction of the aircraft. Yes.
[0043]
The front and rear connecting surfaces 162 and 163 may be formed separately, but as described above, the hitch base 161 is formed of a holding member that holds the horizontal frame 45, and the horizontal frame 45 and the intermediate boss 160 The front and rear connecting surfaces 162 and 163 for connecting the front and rear connecting surfaces 162 and 163 are integrally formed, so that the front and rear connecting surfaces 162 and 163 are formed and assembled as compared with the case where the front and rear connecting surfaces 162 and 163 are formed separately. It is easy to perform, and there are few product dimensional errors and assembly dimensional errors on the front and rear connecting surfaces 162 and 163, and the accuracy is excellent. Also, the welding area between the front and rear connecting surfaces 162 and 163 and the horizontal frame 45 increases, and high joint strength is easy. In other words, it is excellent in that a high bonding strength between the horizontal frame 45 and the intermediate boss 160 is obtained, and the hitch base 161 as a holding member is attached to the horizontal frame 45. The opening portion is closed later by the intermediate boss 160, and the intermediate boss 160 and the front and rear connecting surfaces 162 and 163 synergistically increase the joint strength between the horizontal frame 45 and the rolling fulcrum shaft on the planting portion 15 side. The pivot portion 159 can be integrated with the horizontal frame 45 to be strong in strength. For this reason, even if the intermediate boss 160 and the hitch base 161 itself constituting the rolling fulcrum pivot support 159 on the planting part 15 side are not so strong in strength, the rolling fulcrum pivot support part 159 on the planting part 15 side is provided. The required strength can be secured, contributing to weight reduction and cost reduction.
[0044]
Further, a punched hole 164 is provided in the contact surface of the U-shaped hitch base 161 with the horizontal frame 45 to increase the welding area with the horizontal frame 45, that is, to increase the joint strength and to reduce the weight. The expansion of the welding area of the hitch base 161 with the horizontal frame 45, that is, the increase of the bonding strength, can also be achieved by providing irregularities on the edge of the contact surface portion with the horizontal frame 45 as apparent from the figure.
[0045]
The side surfaces of the seedling feed shaft support member 109 and the hitch base 161 are fixed to each other by welding, so that the seedling feed shaft support member 109 and the hitch base 161 are reinforcing members, and the weight of the hitch base 161 is further increased. In addition to cost reduction, the seedling feed shaft support member 109 is reduced in weight and cost by increasing the strength.
[0046]
Thus, the intermediate boss 160 and the upper fixed portions 162b and 163b of the front and rear connecting surfaces 162 and 163 in the rolling fulcrum pivot support portion 159 on the planting portion 15 side formed as described above are formed as described above from above. The joint space 153 in the rolling fulcrum shaft support portion 151 on the hitch 24 side is externally fitted, and the intermediate boss 160 and the upper fixing portions 162b and 163b of the front and rear connecting surfaces 162 and 163 are fitted in the joint space 153, and the front and rear bosses 154, 154 The intermediate boss 160 is inserted between the bosses 155, 160, 155 and the bosses 154, 160, 155 are arranged in series in the front-rear direction of the machine body. The shaft 97 is inserted into the front boss 154, then the intermediate boss 160, and finally the rear boss 155, and the stopper plate 156 is inserted into the hitch 24. Abutting against the front wall to restrict the insertion of the rolling fulcrum shaft 97 and fixing the stopper plate 156 to the front wall of the hitch 24 via bolts 157 and nuts 158 to prevent the rolling fulcrum shaft 97 from being removed and stopped. The planting portion 15 is pivotally connected to the lower end portion of the hitch 24 via a rolling fulcrum shaft 97, and the planting portion 15 can be tilted to the left and right around the rolling fulcrum shaft 15. Link.
[0047]
In addition, a plurality of interference portions for preventing the planting portion 15 from tilting beyond a certain range with respect to the traveling vehicle 1 are provided in each of the left and right tilt directions, and the rolling fulcrum pivot on the planting portion 15 side is provided. A structure in which upward end surfaces 162c and 163c are formed on both left and right side portions of the intermediate portion of the front and rear connecting surfaces 162 and 163 in the support portion 159, and the upward end surfaces 162c and 163c are formed in accordance with the height of the outermost surface of the horizontal frame 45. When the planting portion 15 is not inclined with respect to the traveling vehicle 1 when the lower ends of the left and right side walls of the hitch 24 corresponding to the left and right side surfaces of the joint space 153 in the rolling fulcrum shaft support portion 151 on the hitch 24 side are front and rear connecting surfaces 162, 163 is spaced upward with respect to the uppermost end surfaces 162c, 163c and the outer peripheral surface of the horizontal frame 45, and the planting portion 15 rises to the left with respect to the traveling vehicle 1. Rolling fulcrum shaft pivot support 151 on the hitch 24 side so as to abut (interfere) with the upper end portions 162c, 163c of the front and rear connecting surfaces 162, 163 and the outer peripheral surface of the lateral frame 45 when tilted to the right by a predetermined angle. Planted with respect to the traveling vehicle 1 in such a manner that the lower ends of the left and right side walls of the hitch 24 corresponding to the left and right side surfaces of the joint space 153 are lifted from the lower ends of the other left and right side walls by the notch 165 having a side view. The upper end surface 162c of the front connection surface 162 that abuts (interferes) when the portion 15 is tilted to the left or right is tilted by a predetermined angle, and the lower end of the left and right side walls of the hitch 24 that is the bottom of the notch 165, One of the upper end surface 163c of the connecting surface 163 and the lower end of the left and right side walls of the hitch 24 which is the bottom of the notch 165, the highest portion of the outer peripheral surface of the horizontal frame 45 and the notch 165 A total of three interference portions A, B, and C are provided at the lower ends of the left and right side walls of the hitch 24 serving as the bottom, and the planting portion 15 side when the planting portion 15 is not inclined with respect to the traveling vehicle 1 is provided. The rolling fulcrum shaft pivot 159 has a central portion at the upper end of the front and rear connecting surfaces 162 and 163, that is, a central portion at the upper end of the upper fixing portions 162b and 163b, and a cylindrical surface centering on the axis of the rolling fulcrum shaft 97. The inside of the upper surface of the bracket 152 in the fulcrum pivot support portion 151, that is, the inside of the cylindrical surface S when having a radius in contact with the ceiling surface of the joint space 153, and the planting portion 15 is not inclined with respect to the traveling vehicle 1. The upper and left and right sides of the front and rear connecting surfaces 162 and 163 in the rolling fulcrum shaft pivot 159 on the planting portion 15 side, that is, the upper and left and right sides of the upper fixing portions 162b and 163b. The cylindrical surface S when the cylindrical surface centering on the axis of the rolling fulcrum shaft 97 has a radius that contacts the inner surface of the upper surface of the bracket 152 in the rolling fulcrum shaft support portion 151 on the hitch 24 side, that is, the ceiling surface of the joint space 153. The upper ends of the front and rear connecting surfaces 162 and 163 in the rolling fulcrum pivotal support portion 159 on the planting portion 15 side when the planting portion 15 is inclined to the left or upward to the right by a predetermined angle with respect to the traveling vehicle 1 The left right side, that is, the upper left and right sides of the upper fixing portions 162b and 163b are in contact (interference) with the inner surface of the upper surface of the bracket 152 in the rolling fulcrum shaft support portion 151 on the hitch 24 side, that is, the ceiling surface of the joint space 153. The upper fixing portions 162b and 163b of the front and rear connecting surfaces 162 and 163 in the rolling fulcrum shaft pivot support portion 159 on the planting portion 15 side are formed. In the configuration, the upper left and right sides of the upper fixing portion 162b on the front side and the ceiling surface of the joint space 153 that abut (interfere) with each other when the planting portion 15 is tilted to the left or right by a predetermined angle with respect to the traveling vehicle 1. In one place, a total of two interference portions D and E are provided on the top left and right sides of the upper fixed portion 163b on the rear side and the ceiling surface of the joint space 153. When tilted leftward or upwardly by a predetermined angle, the structural member of the rolling fulcrum shaft pivot 159 on the planting portion 15 side and the structural member of the rolling fulcrum shaft pivotal portion 151 on the hitch 24 side are simultaneously in contact at five locations ( Interference), and the right and left tilting operation (rolling) of the planting part 15 is restricted to a predetermined range.
[0048]
In addition, with respect to the uppermost end surfaces 162c and 163c of the front and rear connecting surfaces 162 and 163 and the outermost surface of the horizontal frame 45 on the rolling fulcrum shaft pivotal support portion 159 on the planting portion 15 side which is one of the interference portions A, B and C The outer corners of the lower ends of the left and right side walls of the hitch 24 serving as the bottom of the notch 165 in the rolling fulcrum pivot support 151 on the side of the hitch 24 serving as the other of the interference portions A, B, and C abut (interfere). In order to prevent one or both of A, B, and C from being dented and deformed, outward ribs 166 are provided at the lower ends of the left and right side walls of the hitch 24 serving as the bottom side of the notch 165 in the rolling fulcrum shaft support portion 151 on the hitch 24 side. The lower surface of the rib 166 is formed so that the upward end surfaces 162c and 163c of the front and rear connecting surfaces 162 and 163 in the rolling fulcrum pivot support portion 159 on the planting portion 15 side and the horizontal frame 5 highest portion and the abutment of the outer peripheral surface (interference) is, the interference portion A, B, and configured to perform interference C surface contact. Note that the interference of one and the other of the remaining interference portions D and E is performed between the surfaces.
[0049]
As is clear from the above, the intermediate boss 160 that is the rolling support member of the planting portion 15 is at least attached to the horizontal frame 45 that is the planting frame 20 in a direction orthogonal to the intermediate boss 160 in a plan view. Even if a hitch base 161 that is a connecting member for connecting the intermediate boss 160 and the horizontal frame 45 is necessary, the hitch base 161 is small in size. As a result, the hitch stand 161 can be used that is lighter and cheaper than the conventional one, and the riding rice transplanter can be reduced in weight and cost. In addition, the planting unit 15 can be disposed closer to the traveling vehicle 1 than in the past, and the operability when operating various operation levers on the planting unit 15 side while sitting on the driver's seat 13 of the traveling vehicle 1 is improved. In addition, the running performance can be improved by shortening the overall length of the aircraft.
[0050]
Further, an intermediate boss 160 that is a rolling support member of the planting portion 15 is provided directly above the horizontal frame 45 that is the planting frame 20 in a direction orthogonal to the intermediate boss 160, and the intermediate boss 160 and the horizontal frame 45 are provided. Even if a hitch base 161 as a connecting member for connecting the two is necessary, the hitch base 161 is lighter and cheaper than the conventional one by minimizing the hitch base 161 and eliminating the moment applied thereto. Can be used, and the weight reduction and cost reduction of the riding rice transplanter can be achieved. In addition, the planting unit 15 can be arranged closest to the traveling vehicle 1 compared to the conventional one, and the operability when operating various operation levers on the planting unit 15 side while sitting on the driver's seat 13 of the traveling vehicle 1 is improved. It is possible to improve the running performance by shortening the overall length of the aircraft.
[0051]
Moreover, in the riding rice transplanter connected to the traveling vehicle 1 so that the planting portion 15 can be tilted left and right around the rolling fulcrum shaft 97 facing in the front-rear direction, the range where the planting portion 15 is located with respect to the traveling vehicle 1 A plurality of interference portions are provided in each of the right and left tilt directions so as not to be tilted beyond each other, and the force applied to each interference portion A, B, C, D, E is reduced compared to the conventional one, and the interference parts are conventional. It becomes possible to use a lighter and cheaper one than that of the one and reduce the weight and cost of the riding rice transplanter.
[0052]
Further, in the riding rice transplanter connected to the traveling vehicle 1 so that the planting portion 15 can be tilted to the left and right around the rolling fulcrum shaft 97 facing in the front-rear direction, the hitch 24 connected to the traveling vehicle 1 and the planting portion 15 The intermediate boss 160 that is a rolling support member that is connected to the horizontal frame 45 that is orthogonal to the rolling fulcrum shaft 97 of the planting frame 20 is connected by the rolling fulcrum shaft 97, and a plurality of intermediate bosses 160 are connected to the horizontal frame 45. The hitch base 161, which is a connecting member to be connected at a location, is configured to interfere with the hitch 24 at a plurality of locations when the planting part 15 is tilted to a certain tilting posture on the left or right with respect to the traveling vehicle 1. The force applied to each of the interference portions A, B, C, D, and E between the hitch 24 and the hitch base 161 is made smaller than before, and the hitch 24 and hitch base 161 are conventional. Lightly becomes cheaper to the available ones, it is possible to reduce the weight and cost of the riding rice transplanter.
[0053]
FIGS. 29 and 30 show a modification of the rolling fulcrum pivotal support part on the planting part 15 side. The rolling fulcrum pivotal support part 159A on the planting part 15 side is planted without using the hitch stand 161. The intermediate boss 160, which is a rolling support member of the attachment portion 15, is connected to the intermediate boss 160 in a plan view in the left-right central portion or the left-right central portion of the horizontal frame 45 that is the planting frame 20 in a direction orthogonal to the intermediate boss 160. The horizontal frame 45 is connected to the horizontal frame 45 in a horizontal or substantially horizontal posture in the front-rear direction so that the horizontal frame 45 intersects at a right angle. If the hitch base 161 is not used to connect the intermediate boss 160 and the horizontal frame 45, the intermediate boss 160 can be welded and fixed to the horizontal frame 45 only at one point by simply bringing the intermediate boss 160 into contact with the horizontal frame 45. Bond strength is insufficient. In order to compensate for this, a notch 167 along the outer surface of the intermediate boss 160 is provided on the upper surface of the lateral center of the horizontal frame 45 or the upper surface of the substantially central left and right, and the intermediate boss 160 is joined to the notch 167 from above. The outer surface of the intermediate boss 160 and the outer surface of the lateral frame 45 are fixed by welding around the periphery to increase the welding area and obtain the necessary joint strength.
[0054]
Since the planting drive shaft 51 is inserted through the horizontal frame 45, the depth of the notch 167 is such that the bottom surface of the intermediate boss 160 that bites into the horizontal frame 45 does not contact the planting drive shaft 51. Is formed.
[0055]
Further, in the figure, 168 and 169 are integrally raised from the front and rear portions of the intermediate boss 160 in the rolling fulcrum pivot portion 159A on the planting portion 15 side without the hitch base 161, and become one of the interference portions D and E. When the planting portion 15 is tilted up to the left or up by a predetermined angle with respect to the traveling vehicle 1, the inner surface of the upper surface of the bracket 152 in the rolling fulcrum shaft support portion 151 on the hitch 24 side, that is, the ceiling surface of the joint space 153 This is a front / rear stopper that exhibits the same action as the upper fixing portions 162b, 163b of the front / rear connecting surfaces 162, 163 in the other of the interference portions D, E (interfering), that is, the rolling fulcrum shaft pivot support portion 159 on the planting portion 15 side. When the planting portion 15 is tilted to the left or right by a predetermined angle with respect to the traveling vehicle 1, the upper and left sides of the stoppers 168 and 169 are hitch 2 So as to abut (interfere) with the inner surface of the upper surface of the bracket 152 in the side rolling fulcrum pivot portion 151, that is, the ceiling surface of the joint space 153, to restrict the right and left tilting operation (rolling) of the planting portion 15 to a predetermined range. It is configured.
[0056]
As is clear from the above, a notch 167 along the outer surface of the intermediate boss 160 is provided on the horizontal frame 45 that is a planting frame in a direction orthogonal to the intermediate boss 160 that is the rolling support member of the planting portion 15. The intermediate boss 160 is attached to the portion 167, and the intermediate boss 160 can be directly attached to the horizontal frame 45 by welding means or the like, so that a conventional connecting member becomes unnecessary, and the riding rice transplanter is reduced in weight and cost. Can be planned.
[0057]
【The invention's effect】
[0058]
As is apparent from the above embodiments, the invention described in claim 1 Around the rolling fulcrum shaft 97 Planting part 15 In the riding rice transplanter connected to the traveling vehicle 1 so that it can be tilted to the left and right, the hitch 24 connected to the traveling vehicle 1 and the horizontal portion that is orthogonal to the rolling fulcrum shaft 97 in the planting frame 20 of the planting portion 15. An intermediate boss 160, which is a rolling support member connected to the frame 45, is connected by a rolling fulcrum shaft 97, and a hitch base 161, which is a connection member for connecting the intermediate boss 160 to the horizontal frame 45 at a plurality of locations, is attached to the traveling vehicle 1. The planting part 15 is on the left or Right tilt When tilted to a posture, it is configured to interfere with the hitch 24 at a plurality of locations, and the force applied to each of the interference portions A, B, C, D, E between the hitch 24 and the hitch base 161 is made smaller than before. The hitch 24 and the hitch stand 161 can use lighter and cheaper ones than the conventional ones, and there is an effect that the riding rice transplanter can be reduced in weight and cost.
[Brief description of the drawings]
[Fig. 1] Overall side view of a riding rice transplanter
[Fig. 2] Overall plan view of the riding rice transplanter
[Figure 3] Side view of planting part
[Fig. 4] Plan view of planting part
FIG. 5 is an explanatory plan view of the planting part.
FIG. 6 is a schematic front view of a planting part.
Fig. 7 Front view of planting frame
[Fig. 8] Side view of planting frame
FIG. 9 is a plan sectional view of the planting frame part.
[Fig. 10] Left side plan view of planting frame
[Fig. 11] Right side plan view of planting frame
FIG. 12 is a left cross-sectional explanatory view of a planting frame.
FIG. 13 is a partial perspective explanatory view of a planting frame.
FIG. 14 is an explanatory diagram of a seedling removal unit
FIG. 15 is a cross-sectional explanatory view of a seedling feeding case part
FIG. 16 is an explanatory diagram of a transmission shaft portion.
FIG. 17 is an explanatory diagram of a switching mechanism.
FIG. 18 is an explanatory diagram of a planting claw unit clutch portion.
FIG. 19 is an external explanatory view of a planting claw unit clutch portion.
FIG. 20 is an explanatory diagram of a side bumper part.
FIG. 21 is a front view of a rolling fulcrum.
FIG. 22 is a sectional rear view of the rolling fulcrum part.
FIG. 23 is a side view of the rolling fulcrum part.
FIG. 24 is a sectional side view of a rolling fulcrum part.
FIG. 25 is a plan view of the rolling fulcrum part.
FIG. 26 is an exploded side view of the rolling fulcrum part.
FIG. 27 is a cross-sectional rear view of the rolling fulcrum showing the rolling restriction.
FIG. 28 is a side view of the rolling fulcrum showing the rolling restriction.
FIG. 29 is an external perspective view of a rolling fulcrum shaft support portion on the planting portion side according to a modification.
FIG. 30 is a cross-sectional side view of a rolling fulcrum shaft support portion on the planting portion side according to a modification.
[Explanation of symbols]
1 traveling vehicle
15 planting department
20 Planting frame
24 Hitch
45 horizontal frame
97 Rolling fulcrum shaft
160 Intermediate boss (rolling support member)
161 Hitch stand (connection member)
167 Notch
A, B, C, D, E Interference part

Claims

前後方向に向くローリング支点軸回りで植付部を左右に傾けることができるように走行車に連結した乗用田植機において、前記走行車に連結するヒッチと、前記植付部の植付フレームにおけるローリング支点軸と直交する部分に連結するローリング支持部材とを、ローリング支点軸により連結し、前記植付フレームに前記ローリング支持部材を複数箇所で連結させる連結部材を、前記走行車に対して前記植付部が左または右の傾き姿勢に傾いたとき、前記ヒッチと複数箇所で干渉させるように構成したことを特徴とする乗用田植機。In riding rice transplanter linked to vehicles to be able to tilt the planting unit to the left and right in a rolling pivot axis oriented in the longitudinal direction, a hitch for coupling to the vehicle, rolling in the planting frame of the planting unit A rolling support member coupled to a portion orthogonal to the fulcrum shaft is coupled by a rolling fulcrum shaft, and a coupling member for coupling the rolling support member to the planting frame at a plurality of locations is attached to the traveling vehicle. A riding rice transplanter configured to cause interference with the hitch at a plurality of locations when the section is tilted to the left or right .