JP3606946B2

JP3606946B2 - Mower

Info

Publication number: JP3606946B2
Application number: JP13690895A
Authority: JP
Inventors: 実美花房; 友美中谷
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 1995-06-02
Filing date: 1995-06-02
Publication date: 2005-01-05
Anticipated expiration: 2020-01-05
Also published as: JPH08322360A

Description

【０００１】
【産業上の利用分野】
本発明は二面刈り草刈機の改良に関する。
【０００２】
【従来の技術】
稲作の労働軽減の一策として、畦の草刈を人力から機械力に置き換える試みがなされ、例えば（１）特開平６−２７６８２５号公報「草刈機及び角度調整装置及び揺動制御装置」や本出願人が先に提案した（２）実開平５−９２２８号公報「草刈機」がある。
（１）はその公報の図１及び図３によれば、フレームＦにカッター基台２を取付け、このカッター基台２に可変カッター基台３をヒンジ連結した草刈機であって、カッター基台２に畦の上面を刈る回転刃４３を収納し、可変カッター基台３に畦の斜面を刈る回転刃４３ａを収納した構成である。なお、可変カッター基台３にはガイド車輪３１を備えている。
【０００３】
（２）はその公報の図２によれば、支持フレーム７に固定側ハウジング２１を取付け、この固定側ハウジング２１にスイングハウジング２５をヒンジ連結した草刈機であって、固定側ハウジング２１に畦の上面を刈る主回転刃３１を収納し、スイングハウジング２５に畦の斜面を刈る副回転刃３５を収納した構成である。なお、スイングハウジング２５には尾輪６１を備えている。
【０００４】
【発明が解決しようとする課題】
回転刃は畦の草を確実に刈るために、常に畦の上面又は斜面に沿う（畦の上面又は斜面から浮上がらない）ことが求められる。
上記（１）はその公報の図５に示される通り、カッター基台２から可変カッター基台３をオーバーハングしたものである。上記（２）も同様である。
即ち、従来の二面刈り草刈機は重心が畦の斜面側に偏るので、回転刃が畦の斜面から浮上がることはないが、畦の斜面側に曲ろうとする性質があり、直進走行するためには作業者が草刈機を斜面と反対側に傾けながら走行させる必要があり、作業者の負担が少なくない。
本発明の目的は、畦の草を確実に刈ることができる草刈機を提供すること、及び草刈機の直進走行性を向上することにある。
【０００５】
【課題を解決するための手段】
上記目的を達成するために本発明は、車体フレームの前部に前輪を備えるとともに、車体フレームの後部に後輪を備え、車体フレームに取付けられたエンジンにて後輪を駆動するようにし、車体フレームに第１ハウジングを取付け、第１ハウジングに第２ハウジングをヒンジ連結し、第２ハウジングに補助輪を取付け、第１ハウジング内の平面刃で畦の上面を刈り、第２ハウジング内の斜面刃で畦の斜面を刈る形式の草刈機において、
補助輪は、第２ハウジングから延出された補助輪用アームに、トーイン角度調整機構にてトーインの角度を調整可能に取付けたものであり、
トーイン角度調整機構は、補助輪用アームに固着した第２係止部材と、この第２係止部材に噛み合う第１係止部材と、この第１係止部材を軸心上に固着するとともに補助輪を回転自在に取付けた軸とからなり、第１・第２係止部材の相互に対抗する面を勾配面とすることで、第２係止部材に対する第１係止部材の合せ角度を変えて、トーインの角度を調整するように構成したことを特徴とする（請求項１に対応）。
【０００６】
又は、車輪を備えた車体フレームに第１ハウジングを取付け、第１ハウジングに第２ハウジングをヒンジ連結し、第２ハウジングに補助輪を取付け、第１ハウジング内の平面刃で畦の上面を刈り、第２ハウジング内の斜面刃で畦の斜面を刈る形式の草刈機において、
補助輪は、第２ハウジングにキャンバ角度調整機構にて負キャンバの角度を調整可能に取付けたものであり、
キャンバ角度調整機構は、第２ハウジングに固着したブラケットと、このブラケットにピンにて支持した半割状の連結部材と、この半割状の連結部材に弾性材からなるブッシュを介して挿通するとともに補助輪を取付けた補助輪用アームとからなることで、半割状の連結部材に挿通された補助輪用アームを回して、負キャンバの角度を調整するように構成したことを特徴とする（請求項２に対応）。
【０００７】
又は、車体フレームの前部に前輪を備えるとともに、車体フレームの後部に後輪を備え、車体フレームに取付けられたエンジンにて前記後輪を駆動するようにし、車体フレームに第１ハウジングを取付け、第１ハウジングに第２ハウジングをヒンジ連結し、第２ハウジングに補助輪を取付け、第１ハウジング内の平面刃で畦の上面を刈り、第２ハウジング内の斜面刃で畦の斜面を刈る形式の草刈機において、
補助輪は、キャンバ角度調整機構にて負キャンバの角度を調整可能に、且つ、トーイン角度調整機構にてトーインの角度を調整可能に、第２ハウジングに取付けたものであり、
キャンバ角度調整機構は、第２ハウジングに固着したブラケットと、このブラケットにピンにて支持した半割状の連結部材と、この半割状の連結部材に弾性材からなるブッシュを介して挿通した補助輪用アームとからなり、
トーイン角度調整機構は、補助輪用アームに固着した第２係止部材と、この第２係止部材に噛み合う第１係止部材と、この第１係止部材を軸心上に固着するとともに前記補助輪を回転自在に取付けた軸とからなることで、
半割状の連結部材に挿通された補助輪用アームを回して負キャンバの角度を調整するとともに、第２係止部材に対する第１係止部材の合せ角度を変えてトーインの角度を調整するように構成したことを特徴とする（請求項３に対応）。
【０００８】
【作用】
補助輪にトーインを付けたことで、補助輪は第２ハウジングのオーバーハング荷重のために草刈機が畦の斜面側に進もうとするのを防止する。このため、草刈機は直進走行が容易である（請求項１に対応）。
【０００９】
さらに、畦の状態や斜面の傾斜角などに合せて、補助輪のトーインの角度を作業者が自由に設定することができる（請求項１に対応）。
【００１０】
補助輪に負キャンバを付けたことで、補助輪は第２ハウジングのオーバーハング荷重のために草刈機が畦の斜面側に進もうとするのを防止する。このため、草刈機は直進走行が容易である（請求項２に対応）。
【００１１】
さらに、畦の状態や斜面の傾斜角などに合せて、補助輪の負キャンバの角度を作業者が自由に設定することができる（請求項２に対応）。
【００１２】
補助輪にトーインと負キャンバとを付けたことで、補助輪は第２ハウジングのオーバーハング荷重のために草刈機が畦の斜面側に進もうとするのを防止する。このため、草刈機は直進走行が容易である（請求項３に対応）。
【００１３】
さらに、畦の状態や斜面の傾斜角などに合せて、補助輪のトーインの角度及び負キャンバの角度を作業者が自由に設定することができる（請求項３に対応）。
【００１４】
【実施例】
本発明の実施例を添付図に基づいて以下に説明する。なお、「前」、「後」、「左」、「右」、「上」、「下」は草刈機の作業者から見た方向に従う。また、図面は符号の向きに見るものとする。
先ず、図１〜図４に基づき第１実施例を説明する。
図１は本発明に係る草刈機（第１実施例）の平面図であり、草刈機１は、パイプ状の車体フレーム２の前部に前輪３、後部に後輪４を備え、前記車体フレーム２に、より大径の揺動管５を嵌合し、この揺動管５にエンジン７を載置するとともにカッタハウジング１０を吊り下げ、カッタハウジング１０内部に平面刃２１と斜面刃２２とを前後及び左右に離間して配置した二面刈り草刈機の構成である。
【００１５】
カッタハウジング１０は、車体フレーム２に取付けられた固定側ハウジングとしての第１ハウジング１１と揺動側ハウジングとしての第２ハウジング１２とをヒンジ１３にて連結したものであり、第１ハウジング１１は平面刃２１を収納し、第２ハウジング１２は斜面刃２２を収納する。１４はヒンジ１３を通る揺動軸線である。
すなわち、草刈機１は後輪４の輪幅中心を通る車体フレーム２の走行方向軸心Ａから一方（この実施例では左側）に平面刃２１及び斜面刃２２をオフセットし、同方向に前輪３もオフセットし、他方（この実施例では右側）にエンジン７をオフセットしたものである。平面刃２１は走行方向軸心Ａからわずかにオフセットしている。
【００１６】
この場合、前輪３は草刈機１を走行する際の操縦の目安となるガイド車輪であって細幅タイヤであり、後輪４は草刈機１を自走するための走行車輪であって広幅タイヤである。
更に、草刈機１は後輪４側を前輪３側よりも重く設定され、例えば、草刈機１の重量配分は、前輪３で受ける重量と後輪４で受ける重量との比率を約１：４に設定される。
【００１７】
前輪３は、車体フレーム２の前部から延出した前輪用アーム２３に取付けられる。また、第２ハウジング１２の左側前部から補助輪用アーム２４が延出され、補助輪用アーム２４の前部に第２ハウジング１２の高さを規定するための補助輪２５が取付けられる。
【００１８】
ところで、補助輪２５にはトーインを付けている（補助輪２５の前部が走行方向軸線Ａに接近する方向に傾斜している）。
実験の結果、補助輪２５のトーインの角度（走行方向軸線Ａに対する傾斜角）θ１は、１°より小さいと第２ハウジング１２のオーバーハング荷重の影響が残り、４°より大きいと補助輪２５の傾斜の影響が大き過ぎて走行抵抗が大きくなることが判明した。このため、補助輪２５のトーインの角度θ１は実用的である１°〜４°の範囲に設定され、好ましくは２°〜３°の範囲に設定される。
【００１９】
補助輪２５のトーインの角度を１°〜４°の範囲に設定したので、第２ハウジング１２のオーバーハング荷重の影響が除かれ、且つ、補助輪２５の傾斜の影響が大き過ぎて走行抵抗が大きくなることがなく、直進走行性が向上し、操縦し易い。
【００２０】
エンジン７は出力軸７ａが下向きであり、ベルト伝動機構３０を介して前記平面刃２１及び斜面刃２２を回動するものである。
ベルト伝動機構３０は上下２段に張られた第１ベルト３１、第２ベルト３２及びプーリ類からなり、第１ベルト３１で平面刃２１を駆動し、第２ベルト３２で斜面刃２２を駆動するものである。
すなわち、第１ベルト３１は、エンジン７の出力軸７ａに取付けられた第１プーリ３３と、平面刃軸２１ａを駆動するための第２プーリ３４とに巻回されている。
【００２１】
４２は第１ハウジング１１に係止された揺動レバーであり、この揺動レバー４２の一端にテンショナーロール４３、他端にブレーキシュー４４を形成し、作業者が図示せぬ操作レバー及びワイヤで揺動レバー４２を図反時計方向へ揺動すれば、第１ベルト３１は緊張して、第１プーリ３３の動力を第２プーリ３４に伝達し、平面刃軸２１ａを駆動する構成となっている。逆に、揺動レバー４２を図時計方向へ揺動すれば、第１ベルト３１は弛み、動力の伝達が弱まり、ブレーキシュー４２で第１ベルト３１を制動することができる。
以上の要領で、エンジン運転中並びに走行中に、任意に平面刃２１の運転／停止をなせる。
【００２２】
第２ベルト３２は、第２プーリ３４の下方に一体形成されたアイドラープーリ３５（以下「第３プーリ３５」と言う）、斜面刃軸２２ａを駆動するための第４プーリ３６、揺動軸線１４の近傍に概ね前後１列に配列された３つのアイドラープーリ３７〜３９（以下「第５・第６・第７プーリ３７〜３９」と言う）、第５プーリ３７の下方に一体形成されたアイドラープーリ４１（以下「第８プーリ４１」と言う）に巻回されている。
配置的には、後側の第５プーリ３７（第８プーリ４１を含む）を第１ハウジング１１に軸支し、前側の傾斜した第６プーリ３８及び中央の第７プーリ３９を第２ハウジング１２に軸支している。従って、第２ベルト３２は第３プーリ３５・第５プーリ３７・第６プーリ３８・第４プーリ３６・第７プーリ３９・第８プーリ４１・第３プーリ３５のループで巻回される。
【００２３】
図２は本発明に係る草刈機（第１実施例）の側面図（要部）であり、車体フレーム２に揺動管５が取付けられ、この揺動管５にマウントプレート６を介してエンジン７がマウントされ、一方、揺動管５にハンガブラケット８，８を介して第１ハウジング１１が吊り下げられていることを示す。
エンジン７は上記２つの刈刃（平面刃２１及び斜面刃２２）の他に、ユニバーサル軸２６を介して無段変速機２７を駆動し、この無段変速機２７でチェーン２８を介して後輪４を駆動するものである。
【００２４】
前輪用アーム２３はピン５１で車体フレーム２側に取付けられているとともに、差込みピン５２を差し替えることにより上下方向の取付け角を変更できる機構となっている。５３…（…は複数を示す。以下同じ。）はピン孔であり、５４はプレートである。
同様に、補助輪用アーム２４はピン５５で第２ハウジング１２側に取付けられているとともに、差込みピン５６を差し替えることにより上下方向の取付け角を変更できる機構となっている。５７はブラケットであり第２ハウジング１２に固着される。
また、ハンドル６１は車体フレーム２の後部にピン６２で揺動可能に取付けられ、差込みピン６３を差し替えることにより取付け角を変更できる機構となっている。６４…はピン孔であり、６５はサポートである。
【００２５】
なお、上記揺動管５を廃止し、車体フレーム２にブラケットを介して第１ハウジング１１を直接的に取付けてもよいが、本実施例では第１ハウジング１１もある程度揺動可能にした。また、カッタハウジング１０は車体フレーム２に取付けられる構成であればよく、吊り下げる構成に限らず、例えば載置するものでもよい。
【００２６】
図３は本発明に係る草刈機（第１実施例）の正面図であり、第１ハウジング１１にヒンジ１３を介して第２ハウジング１２が揺動自在に連結されていることを示す。なお、６７は前輪３を跨ぐパイプ状の前輪ガード部材である。
【００２７】
以上に述べた草刈機の作用を図３及び図４に基づき説明する。
図４（ａ），（ｂ）は本発明に係る草刈機（第１実施例）の揺動姿勢で走行する状態を示す図であり、（ａ）は正面図、（ｂ）は平面図である。
図３に示す姿勢の草刈機１は、斜面刃２２が平面刃２１と平行（面一）であるところの非揺動姿勢をしており、農道走行及び広い平坦面の草刈に適している。この際、図示しないチェーン等を使用して第２ハウジング１２を持上げることにより、補助輪２５を地面から浮せることもできる。
図４（ａ）に示す姿勢の草刈機１は、畦７０の上面７１に平面刃２１が平行とされ、斜面７２に倣って第２ハウジング１２並びに斜面刃２２が傾斜した姿勢であり、この姿勢で、平面刃２１で畦７０の上面７１の草を刈り、斜面刃２２で斜面７２の草を刈る。
【００２８】
ところで、図４（ａ）に示すように草刈機１は、第２ハウジング１２のオーバーハング荷重の影響で重心が斜面７２側に偏っている。このため、前輪３は図４（ｂ）に示す進行方向左（斜面７２側）にカーブした進行線Ｌの軌跡で走行しようとする。補助輪２５が傾斜していない場合には、作業者が草刈機１を斜面７２と反対側に傾けながら走行させる必要がある。
【００２９】
一般に、車輪（補助輪２５を含む）はトーインが付いていると、傾斜した方向に走行しようとする。
従って、図４（ｂ）に示すように補助輪２５にトーインが付いていると、補助輪２５は斜面７２を登る方向に走行しようとする（この図に示す進行方向右にカーブした進行線Ｒの軌跡）。このため、前輪３が図４（ｂ）に示す直線状の進行線Ｓの軌跡で走行するので、草刈機１は畦７０の上面７１をほぼまっすぐに走行することになり、直進走行性が良い。
【００３０】
次に、図５及び図６に基づき第２実施例を説明する。
この第２実施例は、補助輪２５にトーインの代りに負キャンバを付けたことを特徴とし、以下、詳述する。なお、上記第１実施例と同じ構成については同一符号を付し、その説明を省略する。
図５は本発明に係る草刈機（第２実施例）の正面図であり、補助輪２５には負キャンバを付けている（走行方向軸線Ａを車体縦軸とした場合に、補助輪２５の上部が車体縦軸に接近する方向に傾斜している）。
【００３１】
実験の結果、補助輪２５の負キャンバの角度（上記車体縦軸に対する傾斜角）θ２は、１°より小さいと第２ハウジング１２のオーバーハング荷重の影響が残り、４°より大きいと補助輪２５の傾斜の影響が大き過ぎて草刈機１が畦の斜面と反対側に進もうとすることが判明した。このため、補助輪２５の負キャンバの角度θ２は実用的である１°〜４°の範囲に設定され、好ましくは２°〜３°の範囲に設定される。
【００３２】
補助輪２５の負キャンバの角度を１°〜４°の範囲に設定したので、第２ハウジング１２のオーバーハング荷重の影響が除かれ、且つ、補助輪２５の傾斜の影響が大き過ぎて草刈機１が畦の反対側の斜面に進もうとすることがなく、直進走行性が向上し、操縦し易い。
【００３３】
次に、以上に述べた草刈機１（第２実施例）の作用を図６に基づき説明する。図６（ａ），（ｂ）は本発明に係る草刈機（第２実施例）の揺動姿勢で走行する状態を示す図であり、（ａ）は正面図、（ｂ）は平面図である。
上記図４に示す第１実施例でも説明したが、図６（ａ）に示すように草刈機１は、第２ハウジング１２のオーバーハング荷重の影響で重心が斜面７２側に偏っている。このため、前輪３は図６（ｂ）に示す進行方向左（斜面７２側）にカーブした進行線Ｌの軌跡で走行しようとする。
【００３４】
一般に、車輪（補助輪２５を含む）はキャンバが付いていると、傾斜した方向に走行しようとする。
従って、図６（ａ），（ｂ）に示すように補助輪２５に負キャンバが付いていると、補助輪２５は斜面７２を登る方向に走行しようとする（この図に示す進行方向右にカーブした進行線Ｒの軌跡）。このため、前輪３が図６（ｂ）に示す直線状の進行線Ｓの軌跡で走行するので、草刈機１は畦７０の上面７１をほぼまっすぐに走行することになり、直進走行性が良い。
【００３５】
次に、図７〜図９に基づき第３実施例を説明する。
この第３実施例は、補助輪２５にトーイン及び負キャンバを付けたことを特徴とし、以下、詳述する。なお、上記第１実施例及び第２実施例と同じ構成については同一符号を付し、その説明を省略する。
図７は本発明に係る草刈機（第３実施例）の平面図であり、補助輪２５にトーインを付けていることを示す。補助輪２５のトーインの角度θ１は、実用的である１°〜４°の範囲に設定され、好ましくは２°〜３°の範囲に設定される。
【００３６】
図８は本発明に係る草刈機（第３実施例）の正面図であり、補助輪２５に負キャンバを付けていることを示す。補助輪２５の負キャンバの角度θ２は、実用的である１°〜４°の範囲に設定され、好ましくは２°〜３°の範囲に設定される。
【００３７】
このように、補助輪２５のトーインの角度を１°〜４°の範囲に設定し、且つ、補助輪２５の負キャンバの角度を１°〜４°の範囲に設定したので、オーバーハング荷重の影響が除かれる。また、補助輪２５のトーインの角度の影響が大き過ぎて走行抵抗が大きくなることがなく、更に、補助輪２５の負キャンバの角度の影響が大き過ぎて草刈機１が畦の反対側の斜面に進もうとすることがないので、直進走行性が向上し、操縦し易い。
【００３８】
次に、以上に述べた草刈機１（第３実施例）の作用を図９に基づき説明する。
図９（ａ），（ｂ）は本発明に係る草刈機（第３実施例）の揺動姿勢で走行する状態を示す図であり、（ａ）は正面図、（ｂ）は平面図である。
上記図４に示す第１実施例でも説明したが、図９（ａ）に示すように草刈機１は、第２ハウジング１２のオーバーハング荷重の影響で重心が斜面７２側に偏っている。このため、前輪３は図９（ｂ）に示す進行方向左（斜面７２側）にカーブした進行線Ｌの軌跡で走行しようとする。
【００３９】
一般に、車輪（補助輪２５を含む）はトーインやキャンバが付いていると、傾斜した方向に走行しようとする。
従って、図９（ａ），（ｂ）に示すように補助輪２５にトーイン及び負キャンバが付いていると、補助輪２５は斜面７２を登る方向に走行しようとする（この図に示す進行方向右にカーブした進行線Ｒの軌跡）。このため、前輪３が図９（ｂ）に示す直線状の進行線Ｓの軌跡で走行するので、草刈機１は畦７０の上面７１をほぼまっすぐに走行することになり、直進走行性が良い。
【００４０】
次に、第３実施例の補助輪２５の取付構造の変形例を図１０〜図１２に基づき説明する。
図１０は本発明に係る角度調整機構の平面図であり、角度調整機構８０はトーイン角度調整機構８１とキャンバ角度調整機構８５とからなる。
トーイン角度調整機構８１は補助輪用アーム２４の先端部２４ａに設けられるものであり、補助輪２５を回転自在に取付けられた軸２５ａと、この軸２５ａの心上に固着された第１係止部材８２と、この第１係止部材８２と噛み合うために補助輪用アーム２４の先端部２４ａに固着された第２係止部材８３とからなる。一方、キャンバ角度調整機構８５は、補助輪用アーム２４の基端部２４ｂを図示しない第２ハウジング１２に取付けるものであり、上記図１及び図２で示す第１実施例のピン５５（補助輪用アーム２４を取付けるピン）を利用した構成であって、詳細は図１２で説明する。
【００４１】
図１１（ａ），（ｂ）は本発明に係るトーイン角度調整機構の第１・第２係止部材の側面図であり、円筒材からなる第１・第２係止部材８２，８３は相互に対抗する面が勾配面であり、この勾配面に放射状に刻設された歯８２ａ…，８３ａ…を有する。そして、第１・第２係止部材８２，８３は歯８２ａ…と歯８３ａ…が噛み合うことで互いに係止されている。また、第１・第２係止部材８２，８３は、勾配面の合せ角度を変えることで、補助輪用アーム２４に対する補助輪２５の取付角が変わるものであり、例えば（ａ）の場合に０゜、（ｂ）の場合にα°となる。
なお、８２ｂ，８３ｂは軸２５ａの端部（図１０参照）を挿通するための貫通孔である。
【００４２】
図１２は図１０の１２−１２線拡大断面図であり、キャンバ角度調整機構８５は、想像線で示す第２ハウジング１２に固着されたブラケット５７と、このブラケット５７に取付けられたピン５５と、このピン５５に回動可能に支持された半割状の連結部材８８と、この連結部材８８に挿通されたブッシュ８９とからなる。
ブッシュ８９はゴム材等の弾性材からなる筒体であり、補助輪用アーム２４の基端部２４ｂを挿通する。半割状の連結部材８８はボルト締めすることで、ブッシュ８９を介して基端部２４ｂを締付け、摩擦力で回動不能に取付ける。なお、基端部２４ｂの外周面には突起２４ｃを備えることで、連結部材８８との係止状態を確実にする。
【００４３】
次に、角度調整機構８０の調整手順を説明する。
補助輪２５のトーインの角度を調整するには図１０に示すように、先ず、ナット８４を緩めて軸２５ａを軸方向に移動させ、第１係止部材８２と第２係止部材８３との係止状態を解除する。
次に、第２係止部材８３を所望角度回して第１係止部材８２と第２係止部材８３との合せ角度を変える。
その後、ナット８４を締付けることで、補助輪用アーム２４に対する補助輪２５の取付角を設定する。これにより、補助輪２５のトーインの角度調整作業が完了する。
【００４４】
補助輪２５のキャンバの角度を調整するには図１２に示すように、先ず、ボルト締めされた半割状の連結部材８８を緩めて、補助輪用アーム２４の基端部２４ｂを回動可能にする。
次に、補助輪用アーム２４を所望角度回して、再び半割状の連結部材８８をボルト締めすることで基端部２４ｂを締付け、摩擦力で連結部材８８に回動不能に取付ける。これで、補助輪２５のトーインの角度調整作業は完了する。
【００４５】
なお、上記第１・第２・第３実施例において、補助輪２５を第２ハウジング１２の前部と後部のどちらに配置してもよい。
また、トーイン角度調整機構８１とキャンバ角度調整機構８５とは、いずれか一方を設けたものでもよく、例えば、上記第１実施例の構成ではトーイン角度調整機構８１を設け、上記第２実施例の構成ではキャンバ角度調整機構８５を設けることで、それぞれの角度を自由に調整できる。
【００４６】
【発明の効果】
本発明は上記構成により次の効果を発揮する。
請求項１の草刈機は、車輪を備えた車体フレームに第１ハウジングを取付け、第１ハウジングに対して揺動可能な第２ハウジングに補助輪を取付けたものであって、補助輪にトーインを付けたことにより、畦の草を確実に刈れるとともに、第２ハウジングのオーバーハング荷重のために草刈機が畦の斜面側に進もうとするのを防止して、直進走行性を向上することができる。
【００４７】
さらに請求項１の草刈機は、補助輪のトーインの角度をトーイン角度調整機構にて調整可能としたので、畦の状態や斜面の傾斜角などに合せてトーインの角度を作業者が自由に設定することができる。このため、草刈機の直進走行性及び操縦性を常に最適とすることができる。
【００４８】
請求項２の草刈機は、車輪を備えた車体フレームに第１ハウジングを取付け、第１ハウジングに対して揺動可能な第２ハウジングに補助輪を取付けたものであって、補助輪に負キャンバを付けたことにより、畦の草を確実に刈れるとともに、第２ハウジングのオーバーハング荷重のために草刈機が畦の斜面側に進もうとするのを防止して、直進走行性を向上することができる。
【００４９】
さらに請求項２の草刈機は、補助輪の負キャンバの角度をキャンバ角度調整機構にて調整可能としたので、畦の状態や斜面の傾斜角などに合せて負キャンバの角度を作業者が自由に設定することができる。このため、草刈機の直進走行性及び操縦性を常に最適とすることができる。
【００５０】
請求項３の草刈機は、車輪を備えた車体フレームに第１ハウジングを取付け、第１ハウジングに対して揺動可能な第２ハウジングに補助輪を取付けたものであって、補助輪にトーインを付け且つ負キャンバを付けたことにより、畦の草を確実に刈れるとともに、第２ハウジングのオーバーハング荷重のために草刈機が畦の斜面側に進もうとするのを防止して、直進走行性を向上することができる。
【００５１】
さらに請求項３の草刈機は、トーインの角度及び負キャンバの角度をトーイン角度調整機構及びキャンバ角度調整機構にて調整可能に取付けたので、畦の状態や斜面の傾斜角などに合せてトーインの角度及び負キャンバの角度を作業者が自由に設定することができる。このため、草刈機の直進走行性及び操縦性を常に最適とすることができる。
【図面の簡単な説明】
【図１】本発明に係る草刈機（第１実施例）の平面図
【図２】本発明に係る草刈機（第１実施例）の側面図（要部）
【図３】本発明に係る草刈機（第１実施例）の正面図
【図４】本発明に係る草刈機（第１実施例）の揺動姿勢で走行する状態を示す図
【図５】本発明に係る草刈機（第２実施例）の正面図
【図６】本発明に係る草刈機（第２実施例）の揺動姿勢で走行する状態を示す図
【図７】本発明に係る草刈機（第３実施例）の平面図
【図８】本発明に係る草刈機（第３実施例）の正面図
【図９】本発明に係る草刈機（第３実施例）の揺動姿勢で走行する状態を示す図
【図１０】本発明に係る角度調整機構の平面図
【図１１】本発明に係るトーイン角度調整機構の第１・第２係止部材の側面図
【図１２】図１０の１２−１２線拡大断面図
【符号の説明】
１…草刈機、２…車体フレーム、３…前輪、４…後輪、７…エンジン、１０…カッタハウジング、１１…第１ハウジング、１２…第２ハウジング、１３…ヒンジ、２１…平面刃、２２…斜面刃、２４…補助輪用アーム、２５…補助輪、８０…角度調整機構、８１…トーイン角度調整機構、８２…キャンバ角度調整機構、Ａ…走行方向軸心。[0001]
[Industrial application fields]
The present invention relates to an improvement of a two-sided mower.
[0002]
[Prior art]
As a measure to reduce labor in rice cultivation, an attempt was made to replace the mowing of straw from human power to mechanical power.(1)Japanese Patent Laid-Open No. 6-276825 “Mower, angle adjusting device, and swing control device” and the applicant previously proposed(2)Japanese Utility Model Publication No. 5-9228, “Mower”.
(1)According to FIGS. 1 and 3 of the publication, there is a mower having a cutter base 2 attached to a frame F and a variable cutter base 3 hinged to the cutter base 2. The rotary blade 43 for cutting the upper surface of the blade is housed, and the rotary blade 43a for cutting the slope of the ridge is housed in the variable cutter base 3. The variable cutter base 3 is provided with guide wheels 31.
[0003]
(2)According to FIG. 2 of the publication, a mower with a fixed housing 21 attached to the support frame 7 and a swing housing 25 hinged to the fixed housing 21, which cuts the upper surface of the reed on the fixed housing 21. The main rotary blade 31 is housed, and the sub rotary blade 35 that cuts the slope of the ridge is housed in the swing housing 25. The swing housing 25 includes a tail wheel 61.
[0004]
[Problems to be solved by the invention]
The rotating blade is always required to be along the upper surface or slope of the cocoon (does not float from the upper surface or slope of the cocoon) in order to reliably cut the grass of the cocoon.
the above(1)As shown in FIG. 5 of the publication, the variable cutter base 3 is overhanged from the cutter base 2. the above(2)Is the same.
In other words, the conventional two-sided mower has a center of gravity that is biased toward the slope of the reed, so the rotating blade does not lift from the reed slope, but has the property of trying to bend toward the reed slope and is traveling straight In this case, it is necessary for the operator to run the mower while inclining the mower to the opposite side of the slope, and the burden on the operator is not small.
An object of the present invention is to provide a mower capable of reliably cutting grass of a reed and to improve the straight running performance of the mower.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides:A front wheel is provided at the front of the body frame, a rear wheel is provided at the rear of the body frame, and the rear wheel is driven by an engine attached to the body frame.A first housing is attached to the vehicle body frame, a second housing is hingedly connected to the first housing, an auxiliary wheel is attached to the second housing, a top blade of the first housing is trimmed, and an inclined surface in the second housing In a mower of the type that cuts the slope of the reed with a blade,
The auxiliary wheel is attached to an auxiliary wheel arm extended from the second housing so that the toe-in angle can be adjusted by a toe-in angle adjusting mechanism.
The toe-in angle adjusting mechanism includes a second locking member fixed to the auxiliary wheel arm, a first locking member meshing with the second locking member, and fixing the first locking member on the axis and assisting. It is composed of a shaft on which a ring is rotatably mounted, and the angle of the first locking member relative to the second locking member is changed by making the surfaces of the first and second locking members facing each other a sloped surface. Configured to adjust the toe-in angle(Corresponding to claim 1).
[0006]
Alternatively, the first housing is attached to a vehicle body frame having wheels, the second housing is hingedly connected to the first housing, the auxiliary wheel is attached to the second housing, and the upper surface of the heel is cut with a flat blade in the first housing, In the mower of the type that cuts the slope of the reed with the slope blade in the second housing,
Training wheelsIs attached to the second housing so that the angle of the negative camber can be adjusted by the camber angle adjusting mechanism.
The camber angle adjusting mechanism includes a bracket fixed to the second housing, a half-shaped connecting member supported by a pin on the bracket, and a half-shaped connecting member inserted through a bush made of an elastic material. It consists of an auxiliary wheel arm to which an auxiliary wheel is attached, and is configured to rotate the auxiliary wheel arm inserted through the halved connecting member to adjust the angle of the negative camber. did(Claims)2Corresponding).
[0007]
OrA front wheel is provided at the front of the body frame, a rear wheel is provided at the rear of the body frame, and the rear wheel is driven by an engine attached to the body frame,A first housing is attached to the vehicle body frame, a second housing is hingedly connected to the first housing, an auxiliary wheel is attached to the second housing, a top blade of the first housing is trimmed, and an inclined surface in the second housing In a mower of the type that cuts the slope of the reed with a blade,
The auxiliary wheel is attached to the second housing so that the camber angle adjusting mechanism can adjust the angle of the negative camber and the toe-in angle adjusting mechanism can adjust the angle of the toe-in.
The camber angle adjusting mechanism includes a bracket fixed to the second housing, a half-shaped connecting member supported by a pin on the bracket, and an auxiliary inserted through the half-shaped connecting member through a bush made of an elastic material. Consisting of a wheel arm,
The toe-in angle adjusting mechanism includes a second locking member fixed to the auxiliary wheel arm, a first locking member meshing with the second locking member, and the first locking member fixed on the shaft center. By consisting of a shaft on which an auxiliary wheel is rotatably mounted,
Adjusting the angle of the negative camber by turning the auxiliary wheel arm inserted through the halved connecting member, and adjusting the toe-in angle by changing the alignment angle of the first locking member with respect to the second locking member Configured(Claims)3Corresponding).
[0008]
[Action]
By attaching the toe-in to the auxiliary wheel, the auxiliary wheel prevents the mower from going to the slope side of the reed due to the overhang load of the second housing. For this reason, the mower is easy to travel straight (corresponding to claim 1).
[0009]
further,The operator can freely set the angle of the toe-in of the auxiliary wheel in accordance with the state of the kite and the inclination angle of the slope (claims)1Corresponding).
[0010]
By attaching a negative camber to the auxiliary wheel, the auxiliary wheel prevents the mower from moving toward the slope side of the reed due to the overhang load of the second housing. For this reason, the mower is easy to travel straight ahead.2Corresponding).
[0011]
further,The operator can freely set the angle of the negative camber of the auxiliary wheel in accordance with the state of the kite and the inclination angle of the slope.2Corresponding).
[0012]
By attaching the toe-in and the negative camber to the auxiliary wheel, the auxiliary wheel prevents the mower from going to the slope side of the reed due to the overhang load of the second housing. For this reason, the mower is easy to travel straight ahead.3Corresponding).
[0013]
further,The operator can freely set the angle of the toe-in of the auxiliary wheel and the angle of the negative camber according to the state of the kite and the inclination angle of the slope.3Corresponding).
[0014]
【Example】
Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that “front”, “rear”, “left”, “right”, “upper”, and “lower” follow the direction seen from the operator of the mower. The drawings are to be viewed in the direction of the reference numerals.
First, a first embodiment will be described with reference to FIGS.
FIG. 1 is a plan view of a mower (first embodiment) according to the present invention. The mower 1 includes a front wheel 3 at a front portion of a pipe-shaped body frame 2 and a rear wheel 4 at a rear portion. 2 is fitted with a larger-diameter oscillating tube 5, the engine 7 is placed on the oscillating tube 5, and the cutter housing 10 is suspended, and a flat blade 21 and a slanted blade 22 are placed inside the cutter housing 10. It is the structure of the double-sided mowing machine arrange | positioned spaced apart from front and back and right and left.
[0015]
The cutter housing 10 is formed by connecting a first housing 11 as a stationary housing attached to the vehicle body frame 2 and a second housing 12 as a swinging housing by a hinge 13, and the first housing 11 is a flat surface. The blade 21 is accommodated, and the second housing 12 accommodates the inclined blade 22. Reference numeral 14 denotes an oscillation axis passing through the hinge 13.
That is, the mower 1 offsets the flat blade 21 and the slope blade 22 to one side (left side in this embodiment) from the traveling direction axis A of the vehicle body frame 2 passing through the center of the width of the rear wheel 4, and the front wheel 3 in the same direction. Is offset, and the engine 7 is offset on the other side (right side in this embodiment). The flat blade 21 is slightly offset from the traveling direction axis A.
[0016]
In this case, the front wheel 3 is a guide wheel that serves as a guide for maneuvering when the grass mower 1 travels, and is a narrow tire, and the rear wheel 4 is a travel wheel for self-propelling the grass mower 1, and a wide tire. It is.
Further, the mower 1 is set so that the rear wheel 4 side is heavier than the front wheel 3 side. For example, the weight distribution of the mower 1 is about 1: 4 in the ratio of the weight received by the front wheel 3 to the weight received by the rear wheel 4. Set to
[0017]
The front wheel 3 is attached to a front wheel arm 23 extending from the front portion of the vehicle body frame 2. An auxiliary wheel arm 24 extends from the left front portion of the second housing 12, and an auxiliary wheel 25 for defining the height of the second housing 12 is attached to the front portion of the auxiliary wheel arm 24.
[0018]
By the way, the auxiliary wheel 25 is provided with a toe-in (the front portion of the auxiliary wheel 25 is inclined in a direction approaching the traveling direction axis A).
As a result of the experiment, if the toe-in angle (inclination angle with respect to the travel direction axis A) θ1 of the auxiliary wheel 25 is less than 1 °, the influence of the overhang load of the second housing 12 remains. It has been found that the influence of the slope is too great and the running resistance increases. For this reason, the toe-in angle θ1 of the auxiliary wheel 25 is set to a practical range of 1 ° to 4 °, and preferably set to a range of 2 ° to 3 °.
[0019]
Since the angle of the toe-in of the auxiliary wheel 25 is set in the range of 1 ° to 4 °, the influence of the overhang load of the second housing 12 is removed, and the influence of the inclination of the auxiliary wheel 25 is too great, resulting in a running resistance. It does not become large, the straight running performance is improved, and it is easy to control.
[0020]
The engine 7 has an output shaft 7a facing downward, and rotates the flat blade 21 and the inclined blade 22 via a belt transmission mechanism 30.
The belt transmission mechanism 30 includes a first belt 31, a second belt 32, and pulleys stretched in two upper and lower stages. The first belt 31 drives the flat blade 21, and the second belt 32 drives the inclined blade 22. Is.
That is, the first belt 31 is wound around a first pulley 33 attached to the output shaft 7a of the engine 7 and a second pulley 34 for driving the flat blade shaft 21a.
[0021]
Reference numeral 42 denotes a swing lever that is locked to the first housing 11. A tensioner roll 43 is formed at one end of the swing lever 42 and a brake shoe 44 is formed at the other end. If the swing lever 42 is swung counterclockwise in the figure, the first belt 31 is tensioned, the power of the first pulley 33 is transmitted to the second pulley 34, and the flat blade shaft 21a is driven. Yes. On the contrary, if the swing lever 42 is swung in the clockwise direction, the first belt 31 is loosened, the power transmission is weakened, and the brake belt 42 can brake the first belt 31.
In the above manner, the flat blade 21 can be arbitrarily operated / stopped while the engine is running and running.
[0022]
The second belt 32 includes an idler pulley 35 (hereinafter referred to as “third pulley 35”) integrally formed below the second pulley 34, a fourth pulley 36 for driving the inclined blade shaft 22a, and the swing axis 14. Three idler pulleys 37 to 39 (hereinafter referred to as “fifth, sixth and seventh pulleys 37 to 39”) arranged substantially in a row in the front and rear, and idlers integrally formed below the fifth pulley 37. It is wound around a pulley 41 (hereinafter referred to as “eighth pulley 41”).
In terms of arrangement, the rear fifth pulley 37 (including the eighth pulley 41) is pivotally supported by the first housing 11, and the front inclined sixth pulley 38 and the center seventh pulley 39 are connected to the second housing 12. It is pivotally supported. Accordingly, the second belt 32 is wound around a loop of the third pulley 35, the fifth pulley 37, the sixth pulley 38, the fourth pulley 36, the seventh pulley 39, the eighth pulley 41, and the third pulley 35.
[0023]
FIG. 2 is a side view (main part) of the mower according to the present invention (first embodiment). A swing pipe 5 is attached to the body frame 2, and the engine is connected to the swing pipe 5 via a mount plate 6. 7 shows that the first housing 11 is suspended from the swing pipe 5 via the hanger brackets 8 and 8.
The engine 7 drives a continuously variable transmission 27 via a universal shaft 26 in addition to the two cutting blades (the flat blade 21 and the sloped blade 22), and the rear wheel via the chain 28 is driven by the continuously variable transmission 27. 4 is driven.
[0024]
The front wheel arm 23 is mounted on the vehicle body frame 2 side with a pin 51 and has a mechanism that can change the mounting angle in the vertical direction by replacing the insertion pin 52. 53 (... indicates a plurality, the same applies hereinafter) is a pin hole, and 54 is a plate.
Similarly, the auxiliary wheel arm 24 is attached to the second housing 12 side by a pin 55, and has a mechanism capable of changing the attachment angle in the vertical direction by replacing the insertion pin 56. A bracket 57 is fixed to the second housing 12.
The handle 61 is attached to the rear portion of the vehicle body frame 2 so as to be swingable by a pin 62, and has a mechanism capable of changing the mounting angle by replacing the insertion pin 63. 64 ... is a pin hole and 65 is a support.
[0025]
In addition, although the said rocking | fluctuation pipe | tube 5 was abolished and the 1st housing 11 may be directly attached to the vehicle body frame 2 via a bracket, in this Example, the 1st housing 11 was also able to rock | fluctuate to some extent. Moreover, the cutter housing 10 should just be the structure attached to the vehicle body frame 2, and is not restricted to the structure suspended, for example, may be mounted.
[0026]
FIG. 3 is a front view of the mower according to the present invention (first embodiment), and shows that the second housing 12 is pivotably connected to the first housing 11 via a hinge 13. Reference numeral 67 denotes a pipe-shaped front wheel guard member straddling the front wheel 3.
[0027]
The operation of the mower described above will be described with reference to FIGS.
4 (a) and 4 (b) are views showing a state in which the mower according to the present invention (first embodiment) travels in a swinging posture, wherein (a) is a front view and (b) is a plan view. is there.
The mowing machine 1 in the posture shown in FIG. 3 has a non-oscillating posture in which the sloped blade 22 is parallel (flat) with the flat blade 21 and is suitable for farm road traveling and mowing on a wide flat surface. At this time, the auxiliary wheel 25 can be lifted from the ground by lifting the second housing 12 using a chain or the like (not shown).
The mower 1 in the posture shown in FIG. 4A is a posture in which the flat blade 21 is parallel to the upper surface 71 of the reed 70 and the second housing 12 and the inclined blade 22 are inclined along the inclined surface 72. Then, the grass on the upper surface 71 of the ridge 70 is cut with the flat blade 21, and the grass on the slope 72 is cut with the slope blade 22.
[0028]
By the way, as shown in FIG. 4A, the grass cutter 1 has its center of gravity biased toward the slope 72 due to the influence of the overhang load of the second housing 12. For this reason, the front wheel 3 tries to travel along the locus of the traveling line L curved to the left in the traveling direction (on the slope 72 side) shown in FIG. When the auxiliary wheel 25 is not inclined, it is necessary for the operator to travel while tilting the mower 1 to the side opposite to the slope 72.
[0029]
In general, when a wheel (including the auxiliary wheel 25) has a toe-in, it tends to travel in an inclined direction.
Therefore, as shown in FIG. 4B, if the auxiliary wheel 25 has a toe-in, the auxiliary wheel 25 tends to travel in the direction of climbing the slope 72 (the traveling line R curved to the right in the traveling direction shown in this figure). Trajectory). For this reason, since the front wheel 3 travels along the trajectory of the straight traveling line S shown in FIG. 4B, the mower 1 travels almost straight on the upper surface 71 of the reed 70, and the straight traveling performance is good. .
[0030]
Next, a second embodiment will be described with reference to FIGS.
The second embodiment is characterized in that a negative camber is attached to the auxiliary wheel 25 instead of toe-in, and will be described in detail below. In addition, the same code | symbol is attached | subjected about the same structure as the said 1st Example, and the description is abbreviate | omitted.
FIG. 5 is a front view of the mower according to the present invention (second embodiment), and the auxiliary wheel 25 is provided with a negative camber (when the traveling direction axis A is the longitudinal axis of the vehicle body, the auxiliary wheel 25 The upper part is inclined to approach the longitudinal axis of the vehicle).
[0031]
As a result of the experiment, the negative camber angle (inclination angle with respect to the longitudinal axis of the vehicle body) θ2 of the auxiliary wheel 25 is less than 1 °, and the influence of the overhang load of the second housing 12 remains. It has been found that the influence of the slope of the grass is so great that the mower 1 tries to move to the opposite side of the slope of the reed. For this reason, the angle θ2 of the negative camber of the auxiliary wheel 25 is set to a practical range of 1 ° to 4 °, and preferably set to a range of 2 ° to 3 °.
[0032]
Since the angle of the negative camber of the auxiliary wheel 25 is set in the range of 1 ° to 4 °, the influence of the overhang load of the second housing 12 is removed, and the influence of the inclination of the auxiliary wheel 25 is too great, and the mower 1 does not try to advance to the slope on the opposite side of the kite, improving the straight running performance and making it easy to control.
[0033]
Next, the operation of the mower 1 (second embodiment) described above will be described with reference to FIG. 6 (a) and 6 (b) are diagrams showing a state in which the mower according to the present invention (second embodiment) travels in a swinging posture, where (a) is a front view and (b) is a plan view. is there.
As described in the first embodiment shown in FIG. 4, as shown in FIG. 6A, the grass cutter 1 has a center of gravity biased toward the inclined surface 72 due to the overhang load of the second housing 12. For this reason, the front wheel 3 tries to travel on the locus of the traveling line L curved to the left in the traveling direction (on the slope 72 side) shown in FIG.
[0034]
In general, when a wheel (including the auxiliary wheel 25) has a camber, it tends to travel in an inclined direction.
Therefore, as shown in FIGS. 6A and 6B, when the auxiliary wheel 25 has a negative camber, the auxiliary wheel 25 tends to travel in the direction of climbing the slope 72 (to the right in the traveling direction shown in this figure). Curved travel line R trajectory). For this reason, since the front wheel 3 travels along the trajectory of the straight traveling line S shown in FIG. 6B, the mower 1 travels almost straight on the upper surface 71 of the reed 70, and the straight traveling performance is good. .
[0035]
Next, a third embodiment will be described with reference to FIGS.
The third embodiment is characterized in that the auxiliary wheel 25 is provided with a toe-in and a negative camber, which will be described in detail below. In addition, the same code | symbol is attached | subjected about the same structure as the said 1st Example and 2nd Example, The description is abbreviate | omitted.
FIG. 7 is a plan view of the mower (third embodiment) according to the present invention, and shows that the auxiliary wheel 25 is provided with a toe-in. The toe-in angle θ1 of the auxiliary wheel 25 is set to a practical range of 1 ° to 4 °, and preferably set to a range of 2 ° to 3 °.
[0036]
FIG. 8 is a front view of a mower (third embodiment) according to the present invention, and shows that a negative camber is attached to the auxiliary wheel 25. The angle θ2 of the negative camber of the auxiliary wheel 25 is set to a practical range of 1 ° to 4 °, and preferably set to a range of 2 ° to 3 °.
[0037]
As described above, the toe-in angle of the auxiliary wheel 25 is set in the range of 1 ° to 4 °, and the negative camber angle of the auxiliary wheel 25 is set in the range of 1 ° to 4 °. The effect is removed. Further, the influence of the toe-in angle of the auxiliary wheel 25 is not so great that the running resistance is increased, and further, the influence of the angle of the negative camber of the auxiliary wheel 25 is so great that the mower 1 is inclined on the opposite side of the fence. Because it does not try to go straight, the straight running performance is improved and it is easy to maneuver.
[0038]
Next, the operation of the mower 1 (third embodiment) described above will be described with reference to FIG.
FIGS. 9A and 9B are views showing a state in which the mower according to the present invention (third embodiment) travels in a swinging posture, where FIG. 9A is a front view and FIG. 9B is a plan view. is there.
As described in the first embodiment shown in FIG. 4, the grass cutter 1 has a center of gravity biased toward the slope 72 due to the overhang load of the second housing 12 as shown in FIG. 9A. For this reason, the front wheel 3 tries to travel along the locus of the traveling line L curved to the left in the traveling direction (on the slope 72 side) shown in FIG.
[0039]
In general, when a wheel (including the auxiliary wheel 25) has a toe-in or camber, the wheel tends to travel in an inclined direction.
Therefore, as shown in FIGS. 9A and 9B, when the auxiliary wheel 25 is provided with a toe-in and a negative camber, the auxiliary wheel 25 tends to travel in the direction of climbing the slope 72 (the traveling direction shown in this figure). Trajectory of the traveling line R curved to the right). For this reason, since the front wheel 3 travels along the locus of the straight traveling line S shown in FIG. .
[0040]
Next, a modification of the mounting structure of the auxiliary wheel 25 of the third embodiment will be described with reference to FIGS.
FIG. 10 is a plan view of the angle adjustment mechanism according to the present invention. The angle adjustment mechanism 80 includes a toe-in angle adjustment mechanism 81 and a camber angle adjustment mechanism 85.
The toe-in angle adjusting mechanism 81 is provided at the distal end portion 24a of the auxiliary wheel arm 24, and includes a shaft 25a on which the auxiliary wheel 25 is rotatably mounted, and a first latch fixed to the center of the shaft 25a. It comprises a member 82 and a second locking member 83 fixed to the distal end portion 24a of the auxiliary wheel arm 24 so as to mesh with the first locking member 82. On the other hand, the camber angle adjusting mechanism 85 is for attaching the base end portion 24b of the auxiliary wheel arm 24 to the second housing 12 (not shown), and the pin 55 (auxiliary wheel) of the first embodiment shown in FIGS. The details of this will be described with reference to FIG.
[0041]
FIGS. 11A and 11B are side views of the first and second locking members of the toe-in angle adjusting mechanism according to the present invention, and the first and second locking members 82 and 83 made of a cylindrical material are mutually connected. Is a sloped surface, and has teeth 82a..., 83a. The first and second locking members 82 and 83 are locked to each other when the teeth 82a... And the teeth 83a. Further, the first and second locking members 82 and 83 change the mounting angle of the auxiliary wheel 25 with respect to the auxiliary wheel arm 24 by changing the alignment angle of the inclined surfaces. For example, in the case of (a) In the case of 0 ° and (b), it is α °.
In addition, 82b and 83b are through holes for inserting the end portions (see FIG. 10) of the shaft 25a.
[0042]
12 is an enlarged sectional view taken along the line 12-12 in FIG. 10, and the camber angle adjusting mechanism 85 includes a bracket 57 fixed to the second housing 12 indicated by an imaginary line, and a pin 55 attached to the bracket 57. The pin 55 includes a half-shaped connecting member 88 rotatably supported by the pin 55, and a bush 89 inserted through the connecting member 88.
The bush 89 is a cylindrical body made of an elastic material such as a rubber material, and is inserted through the base end portion 24 b of the auxiliary wheel arm 24. The half-shaped connecting member 88 is bolted to fasten the base end portion 24b via the bush 89, and is attached so as not to rotate by frictional force. In addition, the locking state with the connection member 88 is ensured by providing the protrusion 24c in the outer peripheral surface of the base end part 24b.
[0043]
Next, the adjustment procedure of the angle adjustment mechanism 80 will be described.
To adjust the toe-in angle of the auxiliary wheel 25, as shown in FIG. 10, first, the nut 84 is loosened to move the shaft 25a in the axial direction, and the first locking member 82 and the second locking member 83 are moved. Release the locked state.
Next, the second locking member 83 is rotated by a desired angle to change the alignment angle between the first locking member 82 and the second locking member 83.
Thereafter, the mounting angle of the auxiliary wheel 25 with respect to the auxiliary wheel arm 24 is set by tightening the nut 84. Thereby, the toe-in angle adjustment work of the auxiliary wheel 25 is completed.
[0044]
In order to adjust the camber angle of the auxiliary wheel 25, as shown in FIG. 12, first, the bolted halved connecting member 88 is loosened, and the base end portion 24b of the auxiliary wheel arm 24 can be rotated. To.
Next, the auxiliary wheel arm 24 is turned by a desired angle, and the halved connecting member 88 is bolted again to fasten the base end portion 24b, and is attached to the connecting member 88 in a non-rotatable manner by a frictional force. Thus, the toe-in angle adjustment work of the auxiliary wheel 25 is completed.
[0045]
In the first, second, and third embodiments, the auxiliary wheel 25 may be disposed at either the front portion or the rear portion of the second housing 12.
Further, either the toe-in angle adjusting mechanism 81 or the camber angle adjusting mechanism 85 may be provided. For example, in the configuration of the first embodiment, the toe-in angle adjusting mechanism 81 is provided, and the toy-in angle adjusting mechanism 81 of the second embodiment is provided. In the configuration, by providing the camber angle adjusting mechanism 85, each angle can be freely adjusted.
[0046]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
According to a first aspect of the present invention, there is provided a mower having a first housing attached to a vehicle body frame having wheels, and an auxiliary wheel attached to a second housing that is swingable relative to the first housing, wherein the toe-in is attached to the auxiliary wheel. By attaching, the grass of the reed is surely mowed, and the mowing machine is prevented from moving to the slope side of the reed due to the overhang load of the second housing, thereby improving the straight running performance. Can do.
[0047]
furtherClaim1The mower has the toe-in angle of the auxiliary wheelToe-inSince it can be adjusted by the angle adjustment mechanism, the operator can freely set the angle of the toe-in according to the state of the ridge or the inclination angle of the slope. For this reason, the straight running performance and the maneuverability of the mower can always be optimized.
[0048]
Claim2This mower has a first housing attached to a vehicle body frame having wheels, an auxiliary wheel attached to a second housing that can swing relative to the first housing, and a negative camber attached to the auxiliary wheel. As a result, the grass of the reed can be surely mowed, and the mowing machine can be prevented from proceeding to the slope side of the reed due to the overhang load of the second housing, thereby improving the straight traveling performance. .
[0049]
furtherClaim2The mower of the auxiliary camber negative camber angleCamberSince it can be adjusted by the angle adjustment mechanism, it can be adjusted according to the condition of the ridge and the inclination angle of the slope.Negative camberThe angle of the operator can be freely set. For this reason, the straight running performance and the maneuverability of the mower can always be optimized.
[0050]
Claim3This mower has a first housing attached to a vehicle body frame having wheels, and an auxiliary wheel attached to a second housing that can swing relative to the first housing. By attaching the camber, the grass of the reed is surely mowed, and the mowing machine tries to move to the slope side of the reed due to the overhang load of the second housing, improving the straight running performance can do.
[0051]
furtherClaim3The lawn mower has a toe-in angle and a negative camber angle.With toe-in angle adjustment mechanism and camber angle adjustment mechanismSince it is mounted so that it can be adjusted, the toe-in angle can be adjusted according to the condition of the ridge and the inclination angle of the slope.And negative camber angleCan be freely set by the operator. For this reason, the straight running performance and the maneuverability of the mower can always be optimized.
[Brief description of the drawings]
FIG. 1 is a plan view of a mower (first embodiment) according to the present invention.
FIG. 2 is a side view (main part) of a mower according to the present invention (first embodiment).
FIG. 3 is a front view of a mower (first embodiment) according to the present invention.
FIG. 4 is a diagram showing a state in which the mower according to the present invention (first embodiment) travels in a swinging posture.
FIG. 5 is a front view of a mower (second embodiment) according to the present invention.
FIG. 6 is a diagram showing a state in which the mower according to the present invention (second embodiment) travels in a swinging posture.
FIG. 7 is a plan view of a mower (third embodiment) according to the present invention.
FIG. 8 is a front view of a mower according to the present invention (third embodiment).
FIG. 9 is a diagram showing a state in which the mower according to the present invention (third embodiment) travels in a swinging posture.
FIG. 10 is a plan view of an angle adjustment mechanism according to the present invention.
FIG. 11 is a side view of first and second locking members of the toe-in angle adjusting mechanism according to the present invention.
12 is an enlarged sectional view taken along line 12-12 of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Mower, 2 ... Body frame, 3 ... Front wheel, 4 ... Rear wheel, 7 ... Engine, 10 ... Cutter housing, 11 ... 1st housing, 12 ... 2nd housing, 13 ... Hinge, 21 ... Flat blade, 22 DESCRIPTION OF SYMBOLS ... Slope blade, 24 ... Auxiliary wheel arm, 25 ... Auxiliary wheel, 80 ... Angle adjustment mechanism, 81 ... Toe-in angle adjustment mechanism, 82 ... Camber angle adjustment mechanism, A ... Running direction axis.

Claims

A front wheel is provided at a front portion of the body frame, a rear wheel is provided at a rear portion of the body frame, the rear wheel is driven by an engine attached to the body frame, a first housing is attached to the body frame, A mowing machine in which the second housing is hinged to the housing, an auxiliary wheel is attached to the second housing, the upper surface of the reed is cut with a flat blade in the first housing, and the inclined surface of the reed is cut with the inclined blade in the second housing In
The auxiliary wheel is attached to an auxiliary wheel arm extended from the second housing so that the toe-in angle can be adjusted by a toe-in angle adjusting mechanism.
The toe-in angle adjusting mechanism fixes a second locking member fixed to the auxiliary wheel arm, a first locking member engaged with the second locking member, and the first locking member on an axis. And a shaft on which the auxiliary wheel is rotatably mounted, and the surfaces of the first and second locking members facing each other are inclined surfaces, so that the first locking member is aligned with the second locking member. A mowing machine configured to adjust the angle of the toe-in by changing the angle .

A first housing is attached to a vehicle body frame having wheels, a second housing is hingedly connected to the first housing, an auxiliary wheel is attached to the second housing, a top blade in the first housing is trimmed with a flat blade, and a second In a mower of the type that cuts the slope of the reed with the slope blade in the housing,
The auxiliary wheel is attached to the second housing such that the angle of the negative camber can be adjusted by a camber angle adjusting mechanism.
The camber angle adjusting mechanism is inserted through a bracket fixed to the second housing, a half-shaped connecting member supported by a pin on the bracket, and a bush made of an elastic material into the half-shaped connecting member. And an auxiliary wheel arm to which the auxiliary wheel is attached, so that the angle of the negative camber is adjusted by turning the auxiliary wheel arm inserted through the halved connecting member. And mower.

A front wheel is provided at a front portion of the body frame, a rear wheel is provided at a rear portion of the body frame, the rear wheel is driven by an engine attached to the body frame, a first housing is attached to the body frame, A mowing machine in which the second housing is hinged to the housing, an auxiliary wheel is attached to the second housing, the upper surface of the reed is cut with a flat blade in the first housing, and the inclined surface of the reed is cut with the inclined blade in the second housing In
The auxiliary wheel is attached to the second housing so that the angle of the negative camber can be adjusted by the camber angle adjusting mechanism and the angle of the toe in can be adjusted by the toe-in angle adjusting mechanism.
The camber angle adjusting mechanism is inserted through a bracket fixed to the second housing, a half-shaped connecting member supported by a pin on the bracket, and a bush made of an elastic material to the half-shaped connecting member. With the auxiliary wheel arm,
The toe-in angle adjusting mechanism fixes a second locking member fixed to the auxiliary wheel arm, a first locking member engaged with the second locking member, and the first locking member on an axis. And a shaft on which the auxiliary wheel is rotatably mounted, and the surfaces of the first and second locking members facing each other are inclined surfaces,
Adjusting the angle of the negative camber by turning the auxiliary wheel arm inserted through the halved connecting member, and adjusting the toe-in angle by changing the alignment angle of the first locking member with respect to the second locking member A mower characterized by the construction of