JP4096701B2 - Mowing equipment - Google Patents

Mowing equipment Download PDF

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Publication number
JP4096701B2
JP4096701B2 JP2002322556A JP2002322556A JP4096701B2 JP 4096701 B2 JP4096701 B2 JP 4096701B2 JP 2002322556 A JP2002322556 A JP 2002322556A JP 2002322556 A JP2002322556 A JP 2002322556A JP 4096701 B2 JP4096701 B2 JP 4096701B2
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Japan
Prior art keywords
mower deck
grass
cutting blades
cutting
cutting blade
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Japanese (ja)
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JP2004154048A (en
Inventor
悟志 松木
英和 辻
智男 清川
和加雄 榎本
晋也 吉木
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井関農機株式会社
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    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01DHARVESTING; MOWING
    • A01D34/00Mowers; Mowing apparatus of harvesters
    • A01D34/01Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
    • A01D34/412Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
    • A01D34/63Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
    • A01D34/64Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis mounted on a vehicle, e.g. a tractor, or drawn by an animal or a vehicle
    • A01D34/66Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis mounted on a vehicle, e.g. a tractor, or drawn by an animal or a vehicle with two or more cutters
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01DHARVESTING; MOWING
    • A01D34/00Mowers; Mowing apparatus of harvesters
    • A01D34/01Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
    • A01D34/412Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
    • A01D34/63Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
    • A01D34/76Driving mechanisms for the cutters
    • A01D34/80Driving mechanisms for the cutters fluid
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01DHARVESTING; MOWING
    • A01D34/00Mowers; Mowing apparatus of harvesters
    • A01D34/01Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus

Description

【0001】
【発明の属する技術分野】
この発明は、草や芝を刈り取る草刈装置に関する。
【0002】
【従来の技術】
モアデッキの中に3枚の刈刃を回転自在に設け、このモアデッキを機体の腹下部に昇降自在に取り付けて芝や雑草を刈り取るものが知られている(例えば特許文献1参照)。
【0003】
一般的にこうした芝刈装置は、モアデッキ右側に形成した草排出口から刈り取った草や芝を吐き出すか、この排出口に接続した筒状のシュータを介して車体後部に装着したコレクタに回収するのが普通である。
【0004】
【特許文献1】
特開平11−20484号公報
【0005】
【発明が解決しようとする課題】
刈り取った草や芝をモアデッキの草排出口から吐き出す形態にあっては刈り取った草や芝等が地面に散在しているために刈跡の見栄えが悪く、しかもこれらが風で飛ばされると周囲の作業者や民家に降り掛かったりして環境汚染につながる欠点がある。また、機体横側部のシュータを介してコレクタに回収する形態にあってはシュータが大きく横に突出していることから狭い場所での作業が困難で旋回操作に支障を来たし、特に樹木周辺の雑草を刈り取るのに小回り作業ができないといった欠点があった。
【0006】
また、車体下部から後輪の間を通過させて刈草を後方へ放出させながらコレクタに回収させる方式のものでは草が詰り易いという欠点がある。
さらに、以前は刈刃31と刈刃駆動軸15下部の支持プレートとの間にシェアピンを介装連結していたが、このような方法ではシェアピンが折損したときに、刈刃31に回転動力は伝わらないが、刈刃31が下に落ちないように自由回転可能な状態になって支持されているために、強制的に回転させられているもう一方の刈刃31と交差する時に接触することになって、刈刃31,31同士がぶつかり合う度に大きな音がするという問題点があった。
【0007】
【課題を解決するための手段】
この発明は、前記した問題点に鑑みて提案するものであり、旋回性に優れ、草刈作業も円滑に行なえると共に、刈刃駆動軸によって刈り取った草や芝のモアデッキ内での流れが円滑で排草性に優れ、かつ刈刃同士のぶつかりを無くした草刈装置を得ることを目的とし、このため次のような技術的手段を講じた。
【0008】
即ち、請求項1の発明は、モアデッキ28内に回転自在に設けられた2枚の刈刃31,31を互いに逆向きに回転させて草を刈り取り、この刈り取った草をモアデッキ28中央の草排出通路33から後方へ放出するように構成した草刈装置において、前記モアデッキ28の中央前部に駆動ギヤケース41を前後位置調整自在に設け、この駆動ギヤケース41に軸架した上下方向の縦軸42上にエンジン6側からの動力を受けて回転駆動される歯付駆動プーリ44を設けると共に、この歯付駆動プーリ44と、前記2枚の刈刃31,31を支持する刈刃駆動軸15,15上の歯付入力プーリ54,54との間に歯付ベルト55を巻き掛け、前記歯付ベルト55の歯はベルト55全周の表裏に亘って設け、前記2枚の刈刃31,31の位相差が約90度ずらせて設け、前記駆動プーリ44と縦軸42との間に大きな負荷の作用によって折れてエンジン6側の動力を遮断するシェアピン57を設けたことを特徴とする草刈装置の構成とした。
【0009】
【0010】
前記構成による作用は次の通りである。
エンジン6の回転動力を、まず駆動プーリ44に伝え、更に歯付入力プーリ54、54に伝えてこれら2枚の刈刃31,31を回転させると一方の刈刃31は時計方向に回転され、他方の刈刃31は反対方向に回転させられる。
【0011】
このため、モアデッキ28内に入り込んだ草や芝は相互に反対方向に回転する刈刃31,31によって刈り取られ、モアデッキ28内の2つの排草路29,29を通って左右方向の中央部29Sで合流し、草排出通路33、シュータ36を順次介して走行車体2後方のコレクタ72に回収される。
【0012】
このとき、刈刃31,31を駆動すべくプーリ44,54,54間に巻き回されたベルト55には複数個の歯が設けられ、これらの歯を介してプーリ44,54,54を回転させるように構成したものであるから、ベルト55の回転中に大きな負荷が刈刃31,31に掛かってもベルト55がスリップするようなことがなく、従って、2枚の刈刃31,31の位相が狂ったりすることがなく、従来のように、刈刃31,31同士が当たって激しい騒音を生じさせたりすることがなく、あるいはモアデッキ28内で刈り取られた草や芝がモアデッキ28内に詰まったりせず、刈った草や芝は速やかにモアデッキ28外に排出される。
作業中に大きな負荷が作用したときには前記駆動プーリ44と縦軸42との間に設けたシェアピン57が折れてエンジン6側の動力が刈刃側には伝わらず、このため、2枚の刈刃31,31同士は90度の位相差を保持したままの状態で停止する。
【0013】
【発明の実施の形態】
以下、図面に基づいて、この発明の実施態様を説明する。まず、構成から説明すると、1は乗用型草刈機で走行車体2の前部と後部に夫々前輪3,3と後輪4,4を備え、ボンネット5内にはエンジン6を搭載している。
【0014】
走行車体2の一部を構成する左右一対のフレーム8,8間には走行用可変油圧ポンプ9が支持されている。
エンジン6の出力軸6aはカップリング12を介して走行用可変油圧ポンプ9に連結され、さらにその後部にデフロックバルブ11が設けられている。符号7は冷却用のファンである。
【0015】
そして、走行用可変油圧ポンプ9から送り出された作動油はリヤアクスル10の左右外側に取り付けられた走行用油圧モータ13,13に送られて後輪4,4を回転駆動する。図1において、符号17はリンク機構、18はモアデッキ昇降用の油圧シリンダーである。
【0016】
次に図2、図3、図4に基づき乗用草刈機1の腹下部に装着されるモーア14のモアデッキ28の単体構造について説明する。
モアデッキ28は2本の刈刃駆動軸15,15を軸受支持して回転する刈刃31,31の周囲を覆うものであって、平面から見ると8字を横にしたような形状になっており、モアデッキ28の左半分28Lは右巻きに、右半分28Rは左巻きに渦巻きながら次第に隆起する排草路29,29が設けられ、これらの排草路29,29が左右方向の中央部29Sで合流し、そのまま後方に延設されて1つの草排出通路33が形成されるように構成している。
【0017】
図4に示すようにモアデッキ28の上面で刈刃駆動軸15,15が取り付けられる部分は上方へ突出しており、ここに断面が台形状の取付部35,35が形成される。
この取付部35,35に2本の刈刃駆動軸15,15が軸受39,39にて軸受支持されており、これらの軸受39,39はボルト等の締付手段によりモアデッキ28に固着される。
【0018】
各刈刃駆動軸15,15の上部には外周に複数個の歯を有する入力プーリ54が設けられ、更にモアデッキ28の中央前部には駆動ギヤケース41が前後位置調整自在に設けられ、この駆動ギヤケース41に軸架した上下方向の縦軸42上部に駆動プーリ44が固着されている。この駆動プーリ44の外周にも複数個の歯が設けられている。ベルトの張り量が不足しているときは駆動ギヤケース41を前方に移動させてこれを固定する。
【0019】
駆動ギヤケース41への動力伝達はエンジン6前部からなされるものであり、より具体的には、エンジン6前部から取り出したPTO動力をベルト等の周知の動力伝達手段20を介して駆動ギヤケース41側に伝える。45は動力伝達手段20を介してモアデッキ28側に動力を伝達する自在継手軸であって、その後端部は前記駆動ギヤケース41の入力軸46と連結され、エンジン6側の回転動力をモアデッキ28側へ伝達する。
【0020】
また、図2から明らかなように、モアデッキ28の上面には、2個の歯付アイドルプーリ49,49が設けられ、左側のアイドルプーリ49は左側入力プーリ54よりもやや後方寄り箇所に軸支され、反対に右側のアイドルプーリ49は右側入力プーリ54よりも前方寄り箇所に設けられて夫々の入力プーリ54,54におけるベルト55の巻き掛け範囲を多く取るように構成している。
【0021】
ベルト55の全周であって表面と裏面には複数個の歯が設けられ駆動ギヤケース41側の動力を2つの入力プーリ54,54にスリップなしに伝達するように構成している。
2本の刈刃駆動軸15,15の下部に固着される刈刃31,31は上から見て図2に示すように回転位相差が90度ずれており、左の刈刃31は時計方向に回転し、右の刈刃31は反時計方向に回転するように構成している。
【0022】
従って、両刈刃31,31が互いに回転すると、刈り取られた草や芝はモアデッキ28の排草路29、29を通って中央の草排出通路33で合流し、後方へ移送される。このとき、2枚の刈刃31,31にはスリップすることなく回転動力が伝えられ、しかも90度の位相差があるので刈刃同士31,31が中央部分で衝突し合うことがなく、作業中に刈刃31,31を破損させるようなことはない。
【0023】
次に図5、図6に基づいて刈刃31の詳細構造を説明する。
刈刃31は正面から見ると中央部が僅かに隆起しており、左右両端の回転方向始端部には刃部31aが設けられ、その刃部31a後方には後端を上方へ折曲して起風部31bが形成されている。刈刃31の長手方向には刈刃自体を補強するリブ32が設けられ、中央隆起部には下方へ向かって凸状の4個のリブ32aが設けられ、その両側部の平坦部には上に凸状のリブ32bが設けられている。
【0024】
中央隆起部のリブ32aは下向に凸のため、刈刃31上面の取付プレート(図示省略)装着時に邪魔にならず、また、それらの両側に位置する2個のリブは上向き凸状のリブが形成されているので、これが起風効果を生む。下向きに凸になっていないので、刈取作業中に植わっている草がこのリブに当たって回転時の抵抗になることもない。
【0025】
図7、図8は駆動ギヤケース41部における駆動プーリ44の取付方法について説明したものである。モアデッキ28内の刈刃31,31が回転しているときに石の噛み込みや、大きくて硬い異物に刈刃31,31が当たると駆動系が破損するためにそれを防止する策が取られる。
【0026】
出願人は以前は刈刃31と刈刃駆動軸15下部の支持プレートとの間にシェアピンを介装連結していたが、このような方法ではシェアピンが折損したときに、刈刃31に回転動力は伝わらないが、刈刃31が下に落ちないように自由回転可能な状態になって支持されているために、強制的に回転させられているもう一方の刈刃31と交差する時に接触することになって、刈刃31,31同士がぶつかり合う度に大きな音がするという問題点があった。そこで、出願人は図7、図8に示すように駆動ギヤケース41部における駆動プーリ44とこれを支える縦軸42との間にシェアピン57を介装する構成を採用した。
【0027】
作業中に大きな負荷が作用したときにはこのシェアピン57だけが折れてエンジン6側の動力が刈刃側には伝わらず、このため、2枚の刈刃31,31同士は90度の位相差を保持したままの状態で停止することになる。従って、刈刃31,31がぶつかり合うような不都合は生じない。
【0028】
次に図9に基づいて油圧系について説明する。
エンジン6の動力によって走行用可変油圧ポンプ9が駆動される点は既に述べた通りであるが、エンジン6の動力によってメインギヤポンプ59が駆動され、このメインギヤポンプ59から送り出された作動油によってパワーステアリング装置60が駆動される。ステアリングハンドル16を左右に操舵するとパワーステアリング用のシリンダー62に作動油が流入若しくは排出して舵取りがなされる。
【0029】
そして、パワーステアリング装置60からの戻り油はモアデッキ28昇降用のバルブ64内に入り込み、このバルブ64には上げ位置、中立位置、下げ位置が設けられ、このバルブ64を図示外の油圧操作レバー若しくは昇降スイッチを操作することによって、モアデッキ28全体を昇降できるようになっている。
【0030】
更にパワステアリング装置60からの戻り油は油路66を通って外部操作用のバルブ67に入り込むようにしている。この実施例では操作レバー68を握ってこれを前後方向に動かすことにより油圧シリンダー70内に作動油を供給し、あるいは排出してコレクタ72を回動させる。
【0031】
次に走行系について構成を説明すると、前進時に走行用可変油圧ポンプ9から吐出した作動油は分流メタル74に入って左右に分かれ、左右独立した走行用油圧モータ13,13内に流入して後輪4,4を回転させる。
そして、これら走行用油圧モータ13,13から出た作動油はデフロックバルブ11,11を通過して油路76を通って再び走行用可変油圧ポンプ9に戻るようにしている。後進時は作動油の流入・排出方向が上記の場合とは逆になりデフロックバルブ11を通過した後、走行用油圧モータ13,13に入り、分流メタル74で合流して再び走行用可変油圧ポンプ9内に戻るようにしている。
【0032】
前進時の場合、あるいは後進時の場合、いずれの場合であっても、デフロックバルブ11のソレノイド11aが左右両方共、ONされると左右の走行用油圧モータ13,13の回転数が同じになって結局デフロックが作動した状態になる。
図10は右側のみ逆転ギヤボックス80を設けて左右の刈刃31,31を互いに逆向きに回転させるようにした構造を開示したものである。
【0033】
右側入力プーリ54を固着している刈刃駆動軸15の下部にギヤ84を設け、このギヤ84に噛み合う別のギヤ86をその後方に設け、後側ギヤ86と同軸上に刈刃を設けてこの右側刈刃を反時計方向に回転させるようにしている。
このように、逆転ギヤボックス80を設けて左右の刈刃31,31を互いに逆向きにしかも位相を90度ずらした状態で回転させることによって刈り取った草や芝を確実に且つ円滑に後方に送ることができるのである。
【0034】
この場合において、右側の逆転ギヤボックス80はその長手方向が前後方向に沿う形で設けられているので、草排出通路33を避けた状態で刈刃31の逆転駆動機構を得ることができ、草の排出通路33を狭めたり、高さを十分に取ることができなくて草の排出に支障を来たすようなことがない。
【0035】
次に上例の作用について説明する。
走行ペダルを踏み込んで走行用可変油圧ポンプ9の斜板の傾倒角度を変えると走行用油圧モータ13に送られる油の量が調節され走行車体2は走行速度を増す。
【0036】
この状態で操縦席82横に設けられたPTOクラッチレバーを入り側に倒すとエンジン6の動力が図示外のベルト伝動機構20、自在継手軸45を順次介して駆動ギヤケース41側に伝達される。
駆動ギヤケース41上の駆動プーリ44と左右2つの入力プーリ54,54及びアイドルプーリ49,49間に巻き回されている歯付ベルト55により刈刃31,31は互いに逆向きに回転駆動される。
【0037】
このとき、左側刈刃31は上から見て時計方向に回転し、右側の刈刃31は上から見て反時計方向に回転することになる。左右の刈刃31,31は90度の位相差が保たれているので回転中の交差する際に刃同士が衝突することがない。
従って、両方の刈刃31,31によって草は所定高さのところで刈り取られ、排草路29,29を通って中央部の草排出通路33へ導かれ、シュータ36を介してコレクタ72側へ案内される。このとき、駆動力プーリ44及びアイドルプーリ49全て外周に歯が設けられ、ベルト55側の表裏にも歯が設けられているので、回転時にベルト55がスリップするようなことがなく、2枚の刈刃31,31の位相差を90度に保持した状態で確実に回転駆動させることができる。
【0038】
作業を終えて圃場内を移動するときには、油圧シリンダ102に作動油を供給してモアデッキ28全体を上昇させる。
そして、コレクタ72内が刈草で満杯になればコレクタ回動用の油圧シリンダ70を縮小させてコレクタ72を上昇方向に回動させ、中に詰まっている刈草を地面上に放出させ、再度油圧シリンダ70を伸長させてコレクタ72を元の集草姿勢に復帰させるのである。
【0039】
【発明の効果】
この発明は、モアデッキ28内に回転自在に設けられた2枚の刈刃31,31を互いに逆向きに回転させて草を刈り取り、この刈り取った草をモアデッキ28中央の草排出通路33から後方へ放出するように構成した草刈装置において、前記モアデッキ28の中央前部に駆動ギヤケース41を前後位置調整自在に設け、この駆動ギヤケース41に軸架した上下方向の縦軸42上にエンジン6側からの動力を受けて回転駆動される歯付駆動プーリ44を設けると共に、この歯付駆動プーリ44と、前記2枚の刈刃31,31を支持する刈刃駆動軸15,15上の歯付入力プーリ54,54との間に歯付ベルト55を巻き掛けたものであるから、2枚の刈刃31,31の回転時に大きな負荷が刈刃31,31に掛かってもベルト55がスリップすることがなく、刈刃駆動軸15,15に確実に動力を伝えることができる。しかも、刈刃の一方を逆転させるために従来必要とした逆転ギヤケースのような特別な部材が不要となるので安価に構成でき、メンテナンスも容易になる。
【0040】
また前記歯付ベルト55の歯はベルト55全周の表裏に亘って設けられているから、ベルト55の一方だけでなく両面を有効に活用できてベルト55の歯部の異常磨耗が少なくなり、耐久性も向上するのである。
【0041】
また2枚の刈刃31,31の位相差を約90度ずらして設けたものであるから、刈刃31,31の回転中に刃同士がぶつかり合うことがなく草刈作業を中断されるようなことがない。
さらに、前記駆動プーリ44と縦軸42との間に大きな負荷の作用によって折れてエンジン6側の動力を遮断するシェアピン57を設けたから、作業中に大きな負荷が作用したときにはこのシェアピン57が折れてエンジン6側の動力が刈刃側には伝わらず、このため、2枚の刈刃31,31同士は90度の位相差を保持したままの状態で停止するから、刈刃31,31がぶつかり合うような不都合は生じない。
【図面の簡単な説明】
【図1】乗用草刈機の全体側面図である。
【図2】モアデッキ部分の平面図である。
【図3】モアデッキ部分の側面図である。
【図4】モアデッキ部分の背面図である。
【図5】刈刃の平面図である。
【図6】刈刃の正面図である。
【図7】要部の拡大平面図である。
【図8】要部の拡大断面図である。
【図9】油圧回路図である。
【図10】比較例の平面図である。
【符号の説明】
1 乗用草刈機
2 走行車体
3 前輪
4 後輪
5 ボンネット
6 エンジン
7 冷却ファン
8 フレーム
9 走行用可変油圧ポンプ
10 リヤアクスル
11 デフロックバルブ
13 走行用油圧モータ
14 モーア
16 コレクタ
28 モアデッキ
33 草排出通路
41 駆動ギヤケース
42 縦軸
44 駆動プーリ
54 入力プーリ
55 ベルト
57 シェアピン
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mowing apparatus for mowing grass and turf.
[0002]
[Prior art]
There is known a technique in which three mowing blades are rotatably provided in a mower deck, and the mower deck is attached to the lower part of the abdomen so as to move up and down to cut grass and weeds (see, for example, Patent Document 1).
[0003]
In general, such a lawn mower discharges grass and turf cut from the grass outlet formed on the right side of the mower deck or collects it in a collector attached to the rear of the vehicle body via a cylindrical shooter connected to this outlet. It is normal.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-20484
[Problems to be solved by the invention]
In the form in which the cut grass and turf are discharged from the grass outlet of the mower deck, the cut grass does not look good because the cut grass and turf are scattered on the ground. There is a disadvantage that it falls on workers and private houses and leads to environmental pollution. Also, in the form of collecting to the collector via the shooter on the side of the fuselage, the shooter protrudes sideways so that it is difficult to work in a narrow place and hinders the turning operation, especially weeds around trees However, there was a drawback that it was not possible to make a small turn to reap.
[0006]
In addition, the system in which the collector is collected while passing between the rear wheels from the lower part of the vehicle body and releasing the cut grass backward has a drawback that the grass is easily clogged.
In addition, a shear pin was previously connected between the cutting blade 31 and the support plate below the cutting blade drive shaft 15, but in this method, when the shear pin breaks, the rotational power is transmitted to the cutting blade 31. Although not transmitted, since the cutting blade 31 is supported so that it can freely rotate so as not to fall down, it comes into contact when it intersects with the other cutting blade 31 that is forcibly rotated. Thus, there is a problem that a loud sound is generated every time the cutting blades 31 and 31 collide with each other.
[0007]
[Means for Solving the Problems]
The present invention is proposed in view of the above-described problems, and is excellent in turning performance, can perform grass cutting work smoothly, and has a smooth flow in the mower deck of grass and turf cut by the cutting blade drive shaft. For the purpose of obtaining a mowing apparatus that has excellent herbicidal properties and eliminates collisions between cutting blades, the following technical measures were taken.
[0008]
That is, according to the first aspect of the present invention, the two cutting blades 31, 31 rotatably provided in the mower deck 28 are rotated in opposite directions to cut the grass, and the cut grass is discharged to the center of the mower deck 28. In the mowing apparatus configured to discharge rearward from the passage 33 , a driving gear case 41 is provided at the center front portion of the mower deck 28 so as to be adjustable in the front-rear position, and on the vertical axis 42 in the vertical direction pivoted on the driving gear case 41. A toothed drive pulley 44 that is rotated by receiving power from the engine 6 side is provided, and the toothed drive pulley 44 and the cutting blade drive shafts 15 and 15 that support the two cutting blades 31 and 31 are provided. A toothed belt 55 is wound around the toothed input pulleys 54 and 54, and the teeth of the toothed belt 55 are provided over the entire circumference of the belt 55, and the positions of the two cutting blades 31 and 31 are arranged. About phase difference 0 degrees was shifted provided, and the configuration of the mowing device, characterized in that a shear pin 57 to cut off the power of the engine 6 side broken by the action of the large load between the drive pulley 44 and the longitudinal axis 42.
[0009]
[0010]
The effect | action by the said structure is as follows.
When the rotational power of the engine 6 is first transmitted to the drive pulley 44 and further transmitted to the toothed input pulleys 54 and 54 to rotate the two blades 31 and 31, one blade 31 is rotated clockwise, The other cutting blade 31 is rotated in the opposite direction.
[0011]
For this reason, the grass and turf that have entered the mower deck 28 are mowed by the cutting blades 31 and 31 that rotate in opposite directions, pass through the two weeding paths 29 and 29 in the mower deck 28, and the central portion 29S in the left-right direction. Are collected by the collector 72 at the rear of the traveling vehicle body 2 through the grass discharge passage 33 and the shooter 36 sequentially.
[0012]
At this time, the belt 55 wound between the pulleys 44, 54, 54 to drive the cutting blades 31, 31 is provided with a plurality of teeth, and the pulleys 44, 54, 54 are rotated through these teeth. Therefore, the belt 55 does not slip even if a large load is applied to the cutting blades 31, 31 while the belt 55 is rotating. The phase does not go out of phase, and the cutting blades 31 and 31 do not hit each other and cause intense noise, or the grass and turf cut off in the mower deck 28 are in the mower deck 28 as in the prior art. The mowed grass and turf are quickly discharged out of the mower deck 28 without clogging.
When a large load is applied during work, the shear pin 57 provided between the drive pulley 44 and the longitudinal axis 42 is broken and the power on the engine 6 side is not transmitted to the cutting blade side. 31 and 31 stop in a state where the phase difference of 90 degrees is maintained.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. First, in terms of configuration, reference numeral 1 denotes a riding mower, which includes front wheels 3 and 3 and rear wheels 4 and 4 at the front and rear of the traveling vehicle body 2, respectively, and an engine 6 is mounted in the hood 5.
[0014]
A traveling variable hydraulic pump 9 is supported between a pair of left and right frames 8, 8 constituting a part of the traveling vehicle body 2.
An output shaft 6a of the engine 6 is connected to a travel variable hydraulic pump 9 through a coupling 12, and a differential lock valve 11 is provided at the rear part thereof. Reference numeral 7 denotes a cooling fan.
[0015]
The hydraulic fluid sent from the travel variable hydraulic pump 9 is sent to travel hydraulic motors 13 and 13 attached to the left and right outer sides of the rear axle 10 to drive the rear wheels 4 and 4 to rotate. In FIG. 1, reference numeral 17 is a link mechanism, and 18 is a hydraulic cylinder for lifting and lowering the mower deck.
[0016]
Next, a single structure of the mower deck 28 of the mower 14 attached to the lower abdomen of the riding mower 1 will be described with reference to FIGS. 2, 3, and 4.
The mower deck 28 covers the periphery of the cutting blades 31 and 31 that rotate while supporting the two cutting blade drive shafts 15 and 15. The left half 28L of the mower deck 28 is provided with right-winding and the right half 28R is provided with grass raising paths 29, 29 which are swirled in a left-handed manner and are gradually raised. It merges and it is constituted so that one grass discharge passage 33 may be formed by extending rearward as it is.
[0017]
As shown in FIG. 4, the portion to which the cutting blade drive shafts 15 and 15 are attached on the upper surface of the mower deck 28 protrudes upward, and attachment portions 35 and 35 having a trapezoidal cross section are formed here.
Two cutting blade drive shafts 15 and 15 are supported by bearings 39 and 39 on the mounting portions 35 and 35, and these bearings 39 and 39 are fixed to the mower deck 28 by fastening means such as bolts. .
[0018]
An input pulley 54 having a plurality of teeth on the outer periphery is provided at the upper part of each cutting blade drive shaft 15, 15, and a drive gear case 41 is provided at the center front of the mower deck 28 so that the front and rear positions can be adjusted. A driving pulley 44 is fixed to an upper part of a vertical axis 42 that is pivoted on the gear case 41. A plurality of teeth are also provided on the outer periphery of the drive pulley 44. When the belt tension is insufficient, the drive gear case 41 is moved forward and fixed.
[0019]
The power transmission to the drive gear case 41 is performed from the front part of the engine 6. More specifically, the PTO power taken out from the front part of the engine 6 is transferred to the drive gear case 41 via a known power transmission means 20 such as a belt. Tell the side. A universal joint shaft 45 transmits power to the mower deck 28 via the power transmission means 20, and its rear end portion is connected to the input shaft 46 of the drive gear case 41 so that the rotational power on the engine 6 side is transmitted to the mower deck 28 side. To communicate.
[0020]
As is clear from FIG. 2, two toothed idle pulleys 49 are provided on the upper surface of the mower deck 28, and the left idle pulley 49 is pivotally supported at a position slightly rearward of the left input pulley 54. On the contrary, the right idle pulley 49 is provided at a position closer to the front side than the right input pulley 54, and is configured so as to take a larger winding range of the belt 55 in each of the input pulleys 54 and 54.
[0021]
A plurality of teeth are provided on the front and back surfaces of the entire circumference of the belt 55, and the power on the drive gear case 41 side is transmitted to the two input pulleys 54 and 54 without slipping.
The cutting blades 31, 31 fixed to the lower portions of the two cutting blade drive shafts 15, 15 have a rotational phase difference of 90 degrees as shown in FIG. 2 when viewed from above, and the left cutting blade 31 is clockwise. The right cutting blade 31 is configured to rotate counterclockwise.
[0022]
Therefore, when the cutting blades 31 and 31 rotate with each other, the cut grass and turf merge through the grass discharge passages 29 and 29 of the mower deck 28 in the central grass discharge passage 33 and are transferred rearward. At this time, rotational power is transmitted to the two cutting blades 31 and 31 without slipping, and since there is a phase difference of 90 degrees, the cutting blades 31 and 31 do not collide with each other at the center portion. The cutting blades 31, 31 are not damaged inside.
[0023]
Next, the detailed structure of the cutting blade 31 is demonstrated based on FIG. 5, FIG.
When viewed from the front, the cutting blade 31 has a slightly raised central portion, and a blade portion 31a is provided at the start end portion in the rotational direction at both the left and right ends, and the rear end is bent upward at the rear of the blade portion 31a. The wind generating part 31b is formed. Ribs 32 are provided in the longitudinal direction of the cutting blade 31 to reinforce the cutting blade itself, and four ribs 32a convex downward are provided in the central raised portion, and upper portions are provided on the flat portions on both sides thereof. Convex ribs 32b are provided.
[0024]
Since the rib 32a of the central raised portion is convex downward, it does not get in the way when the mounting plate (not shown) on the upper surface of the cutting blade 31 is mounted, and the two ribs located on both sides of the rib are convex upward. This creates a wind effect. Since it is not convex downward, the grass planted during the cutting operation does not hit the ribs and become a resistance during rotation.
[0025]
7 and 8 illustrate a method for attaching the drive pulley 44 in the drive gear case 41. FIG. When the cutting blades 31, 31 in the mower deck 28 are rotating, measures are taken to prevent the stone from being bitten by the cutting blades 31, 31 when the cutting blades 31, 31 hit the large and hard foreign matter. .
[0026]
The applicant has previously connected a shear pin between the cutting blade 31 and the support plate below the cutting blade drive shaft 15, but in such a method, when the shear pin breaks, the rotational power is applied to the cutting blade 31. However, since the cutting blade 31 is supported in a freely rotatable state so as not to fall down, it comes into contact with the other cutting blade 31 that is forcibly rotated. As a result, there was a problem that a loud sound was made every time the cutting blades 31 and 31 collided with each other. Therefore, the applicant has adopted a configuration in which a shear pin 57 is interposed between the drive pulley 44 in the drive gear case 41 and the vertical axis 42 that supports the pulley as shown in FIGS.
[0027]
When a large load is applied during the operation, only the shear pin 57 is broken and the power on the engine 6 side is not transmitted to the cutting blade side. Therefore, the two cutting blades 31 and 31 maintain a 90-degree phase difference. It will stop in the state that has been done. Therefore, there is no inconvenience that the cutting blades 31, 31 collide with each other.
[0028]
Next, the hydraulic system will be described with reference to FIG.
As described above, the traveling variable hydraulic pump 9 is driven by the power of the engine 6, but the main gear pump 59 is driven by the power of the engine 6, and power steering is performed by the hydraulic oil sent from the main gear pump 59. The device 60 is driven. When the steering handle 16 is steered to the left and right, the hydraulic oil flows into or out of the power steering cylinder 62 to steer.
[0029]
Then, the return oil from the power steering device 60 enters the valve 64 for raising and lowering the mower deck 28. The valve 64 is provided with a raising position, a neutral position, and a lowering position. The entire mower deck 28 can be moved up and down by operating the lift switch.
[0030]
Further, the return oil from the power steering device 60 passes through the oil passage 66 and enters the valve 67 for external operation. In this embodiment, the operating lever 68 is gripped and moved in the front-rear direction to supply or discharge the hydraulic oil into the hydraulic cylinder 70 to rotate the collector 72.
[0031]
Next, the configuration of the traveling system will be described. The hydraulic oil discharged from the traveling variable hydraulic pump 9 during forward travel enters the shunt metal 74 and is divided into left and right parts, flows into the left and right independent traveling hydraulic motors 13 and 13, and thereafter. The wheels 4 and 4 are rotated.
The hydraulic oil discharged from the traveling hydraulic motors 13 and 13 passes through the diff lock valves 11 and 11 and returns to the traveling variable hydraulic pump 9 through the oil passage 76 again. At the time of reverse travel, the direction of inflow / discharge of the hydraulic oil is opposite to that in the above case, and after passing through the diff lock valve 11, it enters the traveling hydraulic motors 13, 13, joins at the shunt metal 74, and again travels variable hydraulic pump 9 to return to.
[0032]
In either case of forward travel or reverse travel, when both the left and right solenoids 11a of the differential lock valve 11 are turned on, the rotational speeds of the left and right traveling hydraulic motors 13 and 13 become the same. After all, the diff lock is activated.
FIG. 10 discloses a structure in which a reverse gear box 80 is provided only on the right side so that the left and right cutting blades 31 and 31 are rotated in directions opposite to each other.
[0033]
A gear 84 is provided at the lower portion of the cutting blade drive shaft 15 to which the right input pulley 54 is fixed, another gear 86 that meshes with the gear 84 is provided at the rear, and a cutting blade is provided coaxially with the rear gear 86. The right cutting blade is rotated counterclockwise.
In this way, by providing the reverse gear box 80 and rotating the left and right cutting blades 31, 31 in opposite directions and with the phase shifted by 90 degrees, the cut grass and turf are reliably and smoothly sent backward. It can be done.
[0034]
In this case, since the longitudinal direction of the right reverse gear box 80 is provided along the front-rear direction, the reverse drive mechanism of the cutting blade 31 can be obtained in a state where the grass discharge passage 33 is avoided. The discharge passage 33 is not narrowed or the height of the discharge passage 33 cannot be sufficiently increased so that the grass discharge is not hindered.
[0035]
Next, the operation of the above example will be described.
When the traveling pedal is depressed to change the tilt angle of the swash plate of the traveling variable hydraulic pump 9, the amount of oil sent to the traveling hydraulic motor 13 is adjusted, and the traveling vehicle body 2 increases the traveling speed.
[0036]
In this state, when the PTO clutch lever provided on the side of the cockpit 82 is tilted to the entry side, the power of the engine 6 is transmitted to the drive gear case 41 side sequentially through the belt transmission mechanism 20 and the universal joint shaft 45 (not shown).
The cutting blades 31 and 31 are rotationally driven in opposite directions by the toothed belt 55 wound around the drive pulley 44 on the drive gear case 41, the left and right input pulleys 54 and 54, and the idle pulleys 49 and 49.
[0037]
At this time, the left cutting blade 31 rotates clockwise when viewed from above, and the right cutting blade 31 rotates counterclockwise when viewed from above. Since the left and right cutting blades 31 and 31 have a 90-degree phase difference, the blades do not collide when they intersect during rotation.
Accordingly, the grass is cut at a predetermined height by both the cutting blades 31, 31, guided to the grass discharge passage 33 in the central portion through the grass removal paths 29, 29, and guided to the collector 72 side through the shooter 36. Is done. At this time, the driving force pulley 44 and the idle pulley 49 are all provided with teeth on the outer periphery, and the front and back surfaces of the belt 55 are also provided with teeth, so that the belt 55 does not slip during rotation. The cutting blades 31 and 31 can be reliably rotated and driven in a state where the phase difference between the cutting blades 31 and 31 is maintained at 90 degrees.
[0038]
When moving in the field after finishing the work, hydraulic oil is supplied to the hydraulic cylinder 102 to raise the entire mower deck 28.
When the inside of the collector 72 is filled with mowing grass, the hydraulic cylinder 70 for rotating the collector is reduced and the collector 72 is rotated in the upward direction so that the mowing grass clogged therein is discharged onto the ground, and again the hydraulic cylinder 70. Is extended to return the collector 72 to the original grass-collecting posture.
[0039]
【The invention's effect】
In the present invention, two mowing blades 31, 31 that are rotatably provided in the mower deck 28 are rotated in opposite directions to mow the grass, and the mowed grass is moved backward from the grass discharge passage 33 at the center of the mower deck 28. In the mowing apparatus configured to release, a drive gear case 41 is provided at the center front portion of the mower deck 28 so that the position of the drive gear case 41 can be adjusted in the front-rear direction . A toothed drive pulley 44 that is rotated by receiving power is provided, and the toothed drive pulley 44 and a toothed input pulley on the cutting blade drive shafts 15 and 15 that support the two cutting blades 31 and 31 are provided. Since the toothed belt 55 is wound between the cutting blades 54 and 54, the belt 55 slips even when a large load is applied to the cutting blades 31 and 31 when the two cutting blades 31 and 31 rotate. It is no, it is possible to convey reliably power to cutting blade drive shaft 15,15. In addition, since a special member such as a reverse gear case that is conventionally required to reverse one of the cutting blades is not required, it can be constructed at low cost and maintenance is facilitated.
[0040]
Further , since the teeth of the toothed belt 55 are provided over the entire front and back of the belt 55, not only one side of the belt 55 but also both sides can be effectively used, and abnormal wear of the tooth portion of the belt 55 is reduced. Durability is also improved.
[0041]
Further , since the phase difference between the two cutting blades 31, 31 is shifted by about 90 degrees, the cutting operation is interrupted without the blades colliding with each other during the rotation of the cutting blades 31, 31. There is nothing.
Further, since a shear pin 57 is provided between the drive pulley 44 and the longitudinal axis 42 to break the power on the engine 6 side by the action of a large load, the shear pin 57 is broken when a large load is applied during work. Since the power on the engine 6 side is not transmitted to the cutting blade side, the two cutting blades 31, 31 stop while maintaining a phase difference of 90 degrees, so the cutting blades 31, 31 collide with each other. There is no inconvenience.
[Brief description of the drawings]
FIG. 1 is an overall side view of a riding mower.
FIG. 2 is a plan view of a mower deck portion.
FIG. 3 is a side view of a mower deck portion.
FIG. 4 is a rear view of a mower deck portion.
FIG. 5 is a plan view of a cutting blade.
FIG. 6 is a front view of a cutting blade.
FIG. 7 is an enlarged plan view of a main part.
FIG. 8 is an enlarged cross-sectional view of a main part.
FIG. 9 is a hydraulic circuit diagram.
FIG. 10 is a plan view of a comparative example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Riding mower 2 Traveling vehicle body 3 Front wheel 4 Rear wheel 5 Bonnet 6 Engine 7 Cooling fan 8 Frame 9 Traveling variable hydraulic pump 10 Rear axle 11 Differential lock valve 13 Traveling hydraulic motor 14 Moor 16 Collector 28 Mower deck 33 Grass discharge passage
41 Drive gear case
42 Vertical axis 44 Drive pulley 54 Input pulley 55 Belt
57 Share Pin

Claims (1)

モアデッキ(28)内に回転自在に設けられた2枚の刈刃(31,31)を互いに逆向きに回転させて草を刈り取り、この刈り取った草をモアデッキ(28)中央の草排出通路(33)から後方へ放出するように構成した草刈装置において、前記モアデッキ(28)の中央前部に駆動ギヤケース(41)を前後位置調整自在に設け、この駆動ギヤケース(41)に軸架した上下方向の縦軸(42)上にエンジン(6)側からの動力を受けて回転駆動される歯付駆動プーリ(44)を設けると共に、この歯付駆動プーリ(44)と、前記2枚の刈刃(31,31)を支持する刈刃駆動軸(15,15)上の歯付入力プーリ(54,54)との間に歯付ベルト(55)を巻き掛け、前記歯付ベルト(55)の歯はベルト(55)全周の表裏に亘って設け、前記2枚の刈刃(31,31)の位相差が約90度ずらせて設け、前記駆動プーリ(44)と縦軸(42)との間に大きな負荷の作用によって折れてエンジン(6)側の動力を遮断するシェアピン(57)を設けたことを特徴とする草刈装置。The two cutting blades (31, 31) provided rotatably in the mower deck (28) are rotated in opposite directions to cut grass, and the cut grass is removed from the grass discharge passage (33 in the center of the mower deck (28). In the mowing apparatus configured to release from the rear of the drive gear case (41), a drive gear case (41) is provided at the center front portion of the mower deck (28) so that the position of the drive gear case (41) can be adjusted. Provided on the vertical axis (42) is a toothed drive pulley (44) that is rotationally driven in response to power from the engine (6) side, the toothed drive pulley (44), and the two cutting blades ( 31, 31) wound around a toothed belt (55) between the toothed input pulley on the cutting blade drive shaft supporting (15, 15) (54,54) the teeth of the toothed belt (55) Is the front and back of the entire circumference of the belt (55) The phase difference between the two cutting blades (31, 31) is shifted by about 90 degrees, and the engine (6) is bent by the action of a large load between the drive pulley (44) and the vertical axis (42). A mowing device provided with a shear pin (57) for cutting off the power on the) side .
JP2002322556A 2002-11-06 2002-11-06 Mowing equipment Expired - Fee Related JP4096701B2 (en)

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JP5065754B2 (en) 2007-05-11 2012-11-07 株式会社クボタ Rear discharge mower
CA2809235C (en) 2010-08-31 2017-10-24 Husqvarna Consumer Outdoor Products N.A., Inc. Center rear discharge deck
KR101689855B1 (en) * 2014-10-14 2016-12-26 명성테크 주식회사 Multi-purporse weeding device

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JP2807330B2 (en) * 1990-10-24 1998-10-08 本田技研工業株式会社 Rear discharge type riding lawn mower
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