JP4116389B2 - HST transmission structure of traveling vehicle - Google Patents

HST transmission structure of traveling vehicle Download PDF

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Publication number
JP4116389B2
JP4116389B2 JP2002290566A JP2002290566A JP4116389B2 JP 4116389 B2 JP4116389 B2 JP 4116389B2 JP 2002290566 A JP2002290566 A JP 2002290566A JP 2002290566 A JP2002290566 A JP 2002290566A JP 4116389 B2 JP4116389 B2 JP 4116389B2
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transmission
hst
traveling
hsts
turn
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JP2004122957A (en
Inventor
憲一 足立
啓一 大本
弘章 山崎
将浩 錦織
政司 嘉本
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MITSUBISHI NOUKI KABUSHIKI KAISHA
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MITSUBISHI NOUKI KABUSHIKI KAISHA
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  • Non-Deflectable Wheels, Steering Of Trailers, Or Other Steering (AREA)
  • Guiding Agricultural Machines (AREA)
  • Harvester Elements (AREA)
  • Motor Power Transmission Devices (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、クローラ式の走行装置を備えたコンバイン等に用いることができる走行車輛のHST伝動構造に関する。
【0002】
【従来の技術】
従来、クローラ式の走行装置をHSTを用いて操向操作及び変速操作を行なうコンバインは、クローラを巻き掛けた走行輪をトランスミッションの左右に軸支するとともに、該左右の走行輪をそれぞれ駆動する2つのHSTを設けて、左旋回と右旋回の走行を行ない、機体を直進走行させる際には、上記2つのHSTを同期回転するように連結した状態で左走行輪と右走行輪を同時伝動させることにより行なうようにしている(例えば、特許文献1参照。)。
【0003】
【特許文献1】
特開2002−81541号公報
【0004】
【発明が解決しようとする課題】
上記特許文献1に記載された構成による伝動構造を備えたコンバインは、直進走行時に2つのHSTを連結するので、一方のHSTと他方のHSTがその油圧モータや油圧ポンプに油圧特性の異なりや微小な回転差を有している場合に、互いのHSTに負荷がかかり、HST効率を低下させるとともに馬力のロスが大きくなる等の問題があった。
【0005】
【発明を解決するための手段】
上記目的を達成するための本発明の走行車輛のHST伝動構造は、左右の走行輪17、18と対となる、それぞれ一対の油圧ポンプと油圧モータにより構成されている2つのHST12、13を主変速レバー8で回転調整機構40を操作して変速可能に駆動するとともに、前記2つのHST12、13を操向操作手段7によって選択操作して直進操行と左旋回と右旋回の伝動を行う走行車輛において、前記2つのHST12、13を走行輪17、18間の伝動系中に、操向操作手段7の選択操作によって、左右の走行輪17、18をそれぞれ単独のHST12、13により駆動させて左旋回と右旋回を行うとともに、一方のHST12の油圧モータからの伝動を切断した状態で他方のHST13の油圧モータのみによって、左右の走行輪17、18を同時伝動させて直進走行させる伝動切替手段9を設けたことを特徴としている。
【0006】
【発明の実施の形態】
本発明の実施の形態を図面に基づいて説明する。
【0007】
1はHST方式のトランスミッション2を備えて操向操作を行なうようにしたクローラ車輛の1例として示すコンバインであり、このコンバイン1は左右のクローラ1L,1Rからなる走行装置を備えた機台1a上に前側から刈取部3、脱穀部4及び操縦部5と穀粒タンク6を従来の装置と同様な配置及び構造によって設置しコンバイン作業を行なうようにしている。
【0008】
また図2、図3で示すように、操縦部5には機体の操向操作を行う操向操作手段としての操向レバー7と、機体の前後進変速操作を行う主変速レバー8並びに各種の作業部レバー等を設けている。
【0009】
尚、上記操向レバー7は、後述するHST伝動構造中に設けた伝動切換手段9と接続し、この伝動切換手段9を介して直立姿勢では機体を直進走行させ、左方への傾倒姿勢では機体を左旋回させ、また右方への傾倒姿勢では右旋回走行をさせるようにしている。
【0010】
上記操向レバー7はその握部の表面左右に上記左右の旋回をそれぞれ微調整する左方向修正スイッチ10と右方向修正スイッチ11を設けている。
【0011】
次に図4を参照してトランスミッション2の構成について説明する。
【0012】
トランスミッション2はケース2aの上側の側面に一対のHST12(以下左HSTと言う)とHST13(以下右HSTと言う)を設け、その各HSTのモータ軸12Mとポンプ軸12P、モータ軸13Mとポンプ軸13Pをケース2aに軸支し、各ポンプ軸12P,13Pに設けた入力ギヤ12N,13Nに、エンジン1Eからベルト伝動機構14を介して駆動される入力軸15に設けた入力ギヤ16を噛合させて同調して駆動されるようにしている。
【0013】
尚、図示例のHST12,13はいずれも油圧モータMと油圧ポンプPで構成され、油圧ポンプP側を主変速レバー8の操作によって斜板の角度を調整して油圧モータM側を速度変更させるようにしている。
【0014】
また、モータ軸12M,13Mにはそれぞれ駆動ギヤ12K,13Kを設け、この駆動ギヤ12K,13Kから前記伝動切換手段9のクラッチ操作による断接切換え作動によって、以下の伝動系を介して左旋回伝動と右旋回伝動を択一的に切換えるとともに、右HST13の駆動ギヤ13K側の動力で、トランスミッション2の下段に軸支されている左右の走行輪17,18を同時に駆動して機体の直進伝動も行なうことができるようにしている(1台のHSTで2個の走行輪の駆動)。
【0015】
即ち、伝動切換手段9は、駆動ギヤ12Kと噛合する左HSTギヤ20と、駆動ギヤ13Kと噛合する右HSTギヤ21と、両ギヤ20、21の中間に位置する左駆動ギヤ22を備えている。そして各ギヤはその軸部を互いに嵌合させて軸基部側に形成したクラッチ爪部を、前記操向レバー7によって操作される油圧シリンダ等からなるアクチュエータ23の進退作動によって選択的に噛合させる機構にしている。尚、上記アクチュエータ23の作動は後述する図5の伝動切換クラッチソレノイド23aによって行なわれるようになっている。
【0016】
これにより伝動切換手段9は、操向レバー7を左傾倒姿勢に操作すると、左HST12側の動力を駆動ギヤ12K、左HSTギヤ20、左駆動ギヤ22を介して右HSTギヤ21、走行輪18の伝動を断ち、この左駆動ギヤ22から後述する中間伝動系を経て走行輪17を駆動する。
【0017】
また、操向レバー7を右傾倒姿勢に操作すると、右HST13側の動力を駆動ギヤ13K、右HSTギヤ21を介して中間伝動系を経て走行輪18のみを駆動する。
【0018】
さらに操向レバー7が直立姿勢であるときは、伝動切換手段9が左HSTギヤ20を空転させることにより左HST12の出力を切断し、左駆動ギヤ22と右HSTギヤ21が連結した状態で、駆動ギヤ13Kを介して右HST13側の動力が右HSTギヤ21とそれぞれのギヤを介し上記中間伝動系を経て走行輪17,18を共に同時に回転させることができる。
【0019】
即ち、この状態では左HST12と右HST13は同一回転数で出力しているので、左HST12からの動力は伝動切換手段9によって切断されて空転している。
【0020】
上記中間伝動系は、ケース2a内で走行輪17,18をそれぞれ有する車軸25,26の内端に設けた車軸ギヤ27,28と、左駆動ギヤ22に伝動ギヤ30を噛合して入力される左副変速ギヤ機構31と、右HSTギヤ21に伝動ギヤ32を噛合して入力される右副変速ギヤ機構33と、上記左副変速ギヤ機構31と車軸ギヤ27及び右副変速ギヤ機構33と車軸ギヤ28を中継伝動するギヤ35,36及びギヤ37,38を軸支する中間軸39等から構成されている。
【0021】
尚、上記左副変速ギヤ機構31と右副変速ギヤ機構33は同一変速仕様に構成されており、操縦部5に設置された図示しない副変速レバーによって、同様に変速操作される。
【0022】
油圧ポンプPは一般にはプランジャポンプであって、プランジャのストロークは傾斜板の傾斜角によって調整されるが、この傾斜板は走行レバー7の傾斜角をコンピュータに入力してモータを駆動し、その回転をギヤを介してポンプPのトラニオン軸を回転させ、前記走行レバー7の傾斜角に対応する回転数を得るように構成されたもので、本発明においてはこの構成を回転調整機構40と称している。
【0023】
また、上記のように構成されたHST伝動構造において、2つのHST12,13による伝動系を切換操作する伝動切換手段9は操向レバー7の左右傾倒操作で行なう一方、この操向レバー7の握部に設けた前述の左方向修正スイッチ10あるいは右方向修正スイッチ11によっても、各スイッチのON方向側への旋回を瞬時的に行なうことができるように構成されており、この構成により左旋回と右旋回を微小に行なわせて機体の直進走行時における方向修正を行ない易くしている。
【0024】
また、この実施形態では左HST12と右HST13にはそれぞれモータ軸12Mとモータ軸13Mの出力回転を所望に変速させる回転調節機構40(図4)を設けてそれぞれの回転調整機構40を前記左方向修正スイッチ10と右方向修正スイッチ11のON操作に対応させて作動するように構成している。
【0025】
即ち、この実施形態に係るコンバイン1は走行及び操向制御を図5で示される制御ブロックの構成によって行なうように構成し、また回転調節機構40はその作動量(位置)を検知する電動モータポテンショメータを備えた電動モータを使用しており、左右の電動モータ40L,40Rはマイコンユニット50の出力側に接続し、これに対応する入力側に電動モータポテンショメータ40LP,40RPを接続している。
【0026】
また、上記マイコンユニット50は入力側に操向レバー7が有する、この操向レバー7の操作量を検出する操向レバーポテンショメータ51と、主変速レバー8が有する、この主変速レバー8の操作量を検出する主変速レバーポテンショメータ52とを有し、更に左方向修正スイッチ10と右方向修正スイッチ11を接続している。また、マイコンユニット50の出力側には既述した伝動切換クラッチソレノイド23aを接続している。
【0027】
以上のように構成されたコンバイン1は、停止状態から前進するとき、オペレータが主変速レバー8を前進方向に操作すると、主変速レバーポテンショメータ52がそのレバー操作量を検出し、マイコンユニット50は左右のHST12,13が前進方向に同回転速度で回転するように、前記左右の電動モータ40L,40Rに指令する。この電動モータ40L、40Rの操作量は左右の伝動モータポテンショメータ40LP,40RPが操作信号をマイコンユニット50に入力することにより制御される。
【0028】
このとき、伝動切換手段9は操向レバー7が直立姿勢であるので直進位置に付勢され、実際には右HST13のみで前進して左HST12は空転状態になる。
【0029】
また、例えば上記前進状態から機体を左方向に旋回する際には、オペレータが操向レバー7を左方向に操作すると、操向レバーポテンショメータ51がレバー操作量を検出してマイコンユニット50に入力するので、マイコンユニット50は伝動切換クラッチソレノイド23aに出力して伝動切換手段9を操作し、左HST12を操向レバーポテンショメータ51からの出力に基づいて減速させて前記伝動切換手段9及び中間伝動系を介し左方向に旋回する。
【0030】
そして、上記左旋回状態から機体を直進状態に戻すときは、オペレータが操向レバー7を中立位置に操作すると、操向レバーポテンショメータ51がレバー中立位置を検出するので、マイコンユニット50は左HST12を右HST13と同じ回転速度になるように左電動モータ40Lに出力し、左右の回転が同じになったと判断されたら伝動切換クラッチソレノイド23aへの出力を停止して直進状態に戻す。
【0031】
また、コンバイン1を直進状態から条合わせする等のために左方向に微調整する時には、オペレータが操向レバー7に設置された左方向修正スイッチ10を操作すると、マイコンユニット50は伝動切換クラッチソレノイド23aに出力して伝動切換手段9を操作し、左HST12が一定時間だけ所定回転(わずかな量だけ)減速するように左電動モータ40Lに出力し、次いで一定時間の経過した後に直進状態に戻すために所定量増速方向に出力し、伝動切換クラッチソレノイド23aの出力を停止することにより僅かに左方向への方向修正をする。
【0032】
尚、右旋回及び右方向への瞬時的な方向修正は、操向レバー7の右旋回操作と右方向修正スイッチ11の操作によって同様に行なうことができる。
【0033】
以上のように構成したHST伝動構造を備えたコンバイン1は、左右の走行輪17,18と対となる2つのHST12,13を主変速レバー8で回転調節機構40を操作して変速可能に駆動するとともに、前記2つのHST12,13を操向操作手段7によって選択操作して直進走行と左旋回と右旋回の伝動を行なう走行車輛において、前記2つのHST12,13をと走行輪17,18間の伝動系中に、操向操作手段7の選択操作によって、左右の走行輪17,18をそれぞれ単独のHST12,13により駆動させて左旋回と右旋回を行なうとともに、一方のHST12の伝動を切断した状態で他方のHST13のみによって、左右の走行輪17,18を同時伝動させて直進走行させる伝動切換手段9を設けて構成している。
【0034】
従って、操向レバー7が図2、図3で示す直立姿勢では伝動切換手段9によって2つのHST12,13のうち一方のHST、即ち、この例においては右HST13のもののみの動力で左右の走行輪17,18を同時に同回転させるので、機体を直進させることができる(尚、何れのHSTを停止するかは、操作条件や装置の構造などで決定されるものである)。
【0035】
このとき他方の左HST12は無負荷状態で空回りするので、上記2つのHSTに油圧特性等に差異を有していたとしても、一方のHSTによって効率よく駆動することができるので馬力ロス等の問題を生じない。
【0036】
また、他方のHSTは上記一方のものと入力ギヤ16を介して同調回転させているので、直進方向伝動から左右旋回伝動への切換え操作が行なわれるときに、ショック等を伴うことなく円滑な切換え伝動を行なうことができる。
【0037】
更に、上記HST伝動構造の伝動切換手段9は、図4に示すように走行輪17、18への伝動系の上手側、即ち2つのHST側に近接させたトランスミッション2の上方側で、ケース2aの一側面にメンテナンス性よく設置することができるから、組立性の向上及び点検修理等も行ない易くする等の利点がある。
【0038】
更に、左右の走行輪17,18を対となる2つのHST12,13を選択操作し、直進走行と左旋回と右旋回の伝動を行う走行車両において、前記2つのHST12,13と走行輪17,18の間の伝動系中に、一方のHST12の伝動を切断した状態で他方のHST13によって、左右の走行輪17,18を同時回転させて直進走行させる伝動切換手段9を設けるとともに、2つのHST17,18に回転調整機構40を設け、且つ伝動切換手段9と回転調整機構40を左方向修正スイッチ10と右方向修正スイッチ11で旋回操作可能に接続し、左方向修正スイッチ10をONしたとき左旋回操作可能に接続し、左修正スイッチ10をONしたとき左旋回を瞬時的に行わせるとともに、右方向修正スイッチ11をONしたとき右旋回を瞬時的に行わせるように構成する。
【0039】
すると直進走行時において、左方向修正スイッチ10又は右方向修正スイッチ11をON操作したとき、対応する回転調整機構40を作動してモータ軸12M又はモータ軸13Mが設定された回転で、伝動切換手段9を介して走行輪17又は走行輪18は、一方が瞬時的に伝動を減速された状態で他方が伝動されるので、機体の左旋回の右旋回の微調整により方向修正をスムーズに行ない植立穀稈条に沿ったコンバイン作業を適正にすることができる。
【0040】
また上記のように構成することにより、従来の装置のようにHST伝動構造中にメカニカルな調整機構を省略できるから、簡潔で廉価な構成にすることができ、またメンテナンス作業も簡単にすることができる等の特徴がある。
【0041】
尚、操向操作手段7は操向レバー7に限ることなく,この操向レバー7に代るスイッチにしてもよい。また、回転調整機構40は伝動モータ40をボリューム等によって可変型にすると修正旋回速度を所望に選定できる。また、図示例では走行輪にクローラを巻き掛けた走行装置を示したが、走行輪がタイヤであってもよい。
【0042】
【発明の効果】
上記の説明から明らかなように本発明の走行車輛のHST伝動構造は、左右の走行輪17,18と対となる2つのHST12,13を主変速レバー8で回転調節機構40を操作して変速可能に駆動するとともに、前記2つのHST12,13を操向操作手段7によって選択操作して直進走行と左旋回と右旋回の伝動を行なう走行車輛において、前記2つのHST12,13を走行輪17,18間の伝動系中に、操向操作手段7の選択操作によって、左右の走行輪17,18をそれぞれ単独のHST12,13により駆動させて左旋回と右旋回を行なうとともに、一方のHST12の伝動を切断した状態で他方のHST13のみによって、左右の走行輪17,18を同時伝動させて直進走行させる伝動切換手段9を設けて構成している。
【0043】
従って,2つのHSTを伝動切換手段9の切り換え操作によって直進走行及び左旋回、右旋回の伝動をスムーズに行なうことができる。また直進走行時を一方のHSTのみによって行なうから効率のよい伝動を行なうことができる。
【0044】
また、本発明によれば単独のHST12、13により左右の走行輪17、18を駆動するので両走行輪17、18の回転が確実に揃うので直進性に優れた走行を極めて容易に行うことができる。
【図面の簡単な説明】
【図1】HST伝動構造を備えたコンバインの斜視図である。
【図2】図1の操縦部を示す斜視図である。
【図3】図2の操向レバーを示す平面図である。
【図4】図1のトランスミッションの構成を示す伝動図である。
【図5】 制御ブロック図である。
【符号の説明】
1 コンバイン(走行車輛)
2 トランスミッション
5 操縦部
7 操向レバー
9 連結クラッチ
10 左方向修正スイッチ
11 右方向修正スイッチ
17,18 走行輪
40 回転調整機構(伝動モータ)
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an HST transmission structure for a traveling vehicle that can be used for a combine equipped with a crawler type traveling device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a combine that performs a steering operation and a speed change operation on a crawler-type traveling device using an HST supports the traveling wheels on which the crawler is wound to the left and right of the transmission, and drives the left and right traveling wheels, respectively. When two HSTs are provided to make a left turn and a right turn and the aircraft is to go straight, the left and right wheels are simultaneously transmitted with the two HSTs connected so as to rotate synchronously. (See, for example, Patent Document 1).
[0003]
[Patent Document 1]
JP-A-2002-81541 [0004]
[Problems to be solved by the invention]
The combine provided with the transmission structure according to the configuration described in Patent Document 1 connects two HSTs when traveling straight ahead, so that one HST and the other HST have different hydraulic characteristics or slight differences between the hydraulic motor and the hydraulic pump. When the rotation difference is large, there is a problem that a load is applied to each other's HST, the HST efficiency is reduced, and the horsepower loss is increased.
[0005]
[Means for Solving the Invention]
In order to achieve the above object, the HST transmission structure of the traveling vehicle of the present invention is mainly composed of two HSTs 12 and 13 which are paired with the left and right traveling wheels 17 and 18 and are respectively composed of a pair of hydraulic pumps and hydraulic motors. Driving the speed adjusting lever 40 to operate the rotation adjusting mechanism 40 so that the speed can be changed, and the two HSTs 12 and 13 are selectively operated by the steering operating means 7 to perform the straight operation, the left turn, and the right turn transmission. In the vehicle, the two HSTs 12 and 13 are driven by the independent HSTs 12 and 13 by the selection operation of the steering operation means 7 in the transmission system between the traveling wheels 17 and 18, respectively. Transmission switching to turn left and right and simultaneously drive the left and right traveling wheels 17, 18 simultaneously with only the hydraulic motor of the other HST13 with the transmission from the hydraulic motor of one HST12 cut off A feature 9 is provided.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0007]
Reference numeral 1 denotes a combine shown as an example of a crawler vehicle equipped with an HST transmission 2 to perform a steering operation. The combine 1 is on a machine base 1a provided with a traveling device including left and right crawlers 1L and 1R. Further, the harvesting unit 3, the threshing unit 4, the control unit 5 and the grain tank 6 are installed from the front side by the same arrangement and structure as the conventional apparatus, and the combine operation is performed.
[0008]
As shown in FIGS. 2 and 3, the steering unit 5 includes a steering lever 7 as a steering operation means for performing a steering operation of the aircraft, a main transmission lever 8 for performing a forward / reverse shift operation of the aircraft, and various kinds of operations. A working unit lever and the like are provided.
[0009]
The steering lever 7 is connected to a transmission switching means 9 provided in an HST transmission structure described later, and causes the aircraft to travel straight in an upright position via the transmission switching means 9 and in a leaning posture to the left. The aircraft is turned to the left, and in a tilted posture to the right, it is made to turn right.
[0010]
The steering lever 7 is provided with a left direction correction switch 10 and a right direction correction switch 11 for finely adjusting the left and right turnings on the left and right sides of the grip.
[0011]
Next, the configuration of the transmission 2 will be described with reference to FIG.
[0012]
The transmission 2 is provided with a pair of HST 12 (hereinafter referred to as left HST) and HST 13 (hereinafter referred to as right HST) on the upper side surface of the case 2a, and the motor shaft 12M and pump shaft 12P, motor shaft 13M and pump shaft of each HST. 13P is supported by the case 2a, and the input gear 16 provided on the input shaft 15 driven from the engine 1E via the belt transmission mechanism 14 is engaged with the input gears 12N and 13N provided on the pump shafts 12P and 13P. Are driven in synchronism with each other.
[0013]
The HSTs 12 and 13 in the illustrated example are each composed of a hydraulic motor M and a hydraulic pump P, and the hydraulic pump M side is adjusted by adjusting the angle of the swash plate by operating the main transmission lever 8 to change the speed of the hydraulic motor M side. I am doing so.
[0014]
Further, the motor shafts 12M and 13M are provided with drive gears 12K and 13K, respectively, and the drive gears 12K and 13K are connected to each other by the clutch operation of the transmission switching means 9 to perform the left turn transmission through the following transmission system. And right-turning transmission are selectively switched, and the power on the drive gear 13K side of the right HST 13 drives the left and right traveling wheels 17 and 18 that are pivotally supported on the lower stage of the transmission 2 at the same time. (The driving of two traveling wheels with one HST).
[0015]
That is, the transmission switching means 9 includes a left HST gear 20 that meshes with the drive gear 12K, a right HST gear 21 that meshes with the drive gear 13K, and a left drive gear 22 that is positioned between the two gears 20 and 21. . Each gear is a mechanism for selectively engaging the clutch pawl portion formed on the shaft base side by fitting the shaft portions to each other by the advance / retreat operation of the actuator 23 including a hydraulic cylinder operated by the steering lever 7. I have to. The actuator 23 is operated by a transmission switching clutch solenoid 23a shown in FIG.
[0016]
Thus, when the steering lever 7 is operated to the left tilted position, the transmission switching means 9 transmits the power on the left HST 12 side via the drive gear 12K, the left HST gear 20, and the left drive gear 22 to the right HST gear 21 and the traveling wheel 18. The driving wheel 17 is driven from the left drive gear 22 through an intermediate transmission system described later.
[0017]
Further, when the steering lever 7 is operated to the right tilting posture, the power on the right HST 13 side is driven only through the driving gear 13K and the right HST gear 21 through the intermediate transmission system and only the traveling wheels 18.
[0018]
Further, when the steering lever 7 is in the upright posture, the transmission switching means 9 idles the left HST gear 20 to cut off the output of the left HST 12, and the left drive gear 22 and the right HST gear 21 are connected. The power on the right HST 13 side via the drive gear 13K can simultaneously rotate the traveling wheels 17 and 18 via the right HST gear 21 and the respective gears via the intermediate transmission system.
[0019]
That is, in this state, the left HST 12 and the right HST 13 output at the same rotation speed, so the power from the left HST 12 is cut by the transmission switching means 9 and idles.
[0020]
The intermediate transmission system is input by meshing the transmission gear 30 with the left drive gear 22 and the axle gears 27 and 28 provided at the inner ends of the axles 25 and 26 having the traveling wheels 17 and 18 in the case 2a. A left sub-transmission gear mechanism 31, a right sub-transmission gear mechanism 33 that is input by engaging the transmission gear 32 with the right HST gear 21, the left sub-transmission gear mechanism 31, the axle gear 27, and the right sub-transmission gear mechanism 33; It comprises gears 35 and 36 for relay transmission of the axle gear 28, an intermediate shaft 39 for supporting the gears 37 and 38, and the like.
[0021]
The left sub-transmission gear mechanism 31 and the right sub-transmission gear mechanism 33 are configured to have the same transmission specifications and are similarly operated by a sub transmission lever (not shown) installed in the control unit 5.
[0022]
The hydraulic pump P is generally a plunger pump, and the stroke of the plunger is adjusted by the inclination angle of the inclined plate. The inclined plate inputs the inclination angle of the traveling lever 7 to the computer to drive the motor, and rotates. The trunnion shaft of the pump P is rotated through a gear to obtain a rotational speed corresponding to the inclination angle of the travel lever 7. In the present invention, this configuration is referred to as a rotation adjusting mechanism 40. Yes.
[0023]
Further, in the HST transmission structure configured as described above, the transmission switching means 9 for switching the transmission system by the two HSTs 12 and 13 is performed by tilting the steering lever 7 to the left and right. The above-described left direction correction switch 10 or right direction correction switch 11 provided in the unit is also configured to be able to instantaneously turn each switch in the ON direction side. By making a slight right turn, it is easy to correct the direction when the aircraft is traveling straight ahead.
[0024]
In this embodiment, the left HST 12 and the right HST 13 are each provided with a rotation adjusting mechanism 40 (FIG. 4) for shifting the output rotation of the motor shaft 12M and the motor shaft 13M as desired. The correction switch 10 and the right direction correction switch 11 are configured to operate in response to the ON operation.
[0025]
In other words, the combine 1 according to this embodiment is configured to perform traveling and steering control by the configuration of the control block shown in FIG. 5, and the rotation adjusting mechanism 40 detects an operation amount (position) of the electric motor potentiometer. The left and right electric motors 40L and 40R are connected to the output side of the microcomputer unit 50, and the electric motor potentiometers 40LP and 40RP are connected to the corresponding input side.
[0026]
The microcomputer unit 50 has a steering lever potentiometer 51 for detecting an operation amount of the steering lever 7 and an operation amount of the main transmission lever 8 which the main transmission lever 8 has. And a left direction correction switch 10 and a right direction correction switch 11 are connected. Further, the transmission switching clutch solenoid 23a described above is connected to the output side of the microcomputer unit 50.
[0027]
When the combine 1 configured as described above moves forward from the stop state, when the operator operates the main transmission lever 8 in the forward direction, the main transmission lever potentiometer 52 detects the lever operation amount, and the microcomputer unit 50 The left and right electric motors 40L and 40R are instructed so that the HSTs 12 and 13 rotate in the forward direction at the same rotational speed. The operation amounts of the electric motors 40L and 40R are controlled when the left and right transmission motor potentiometers 40LP and 40RP input operation signals to the microcomputer unit 50.
[0028]
At this time, the transmission switching means 9 is urged to the straight traveling position because the steering lever 7 is in the upright posture, and is actually advanced only by the right HST 13 and the left HST 12 is in the idling state.
[0029]
For example, when the operator turns the aircraft to the left from the forward state, when the operator operates the steering lever 7 to the left, the steering lever potentiometer 51 detects the lever operation amount and inputs it to the microcomputer unit 50. Therefore, the microcomputer unit 50 outputs to the transmission switching clutch solenoid 23a to operate the transmission switching means 9, and decelerates the left HST 12 on the basis of the output from the steering lever potentiometer 51, thereby causing the transmission switching means 9 and the intermediate transmission system to operate. Turn left.
[0030]
When returning the aircraft from the left-turning state to the straight traveling state, when the operator operates the steering lever 7 to the neutral position, the steering lever potentiometer 51 detects the lever neutral position, so the microcomputer unit 50 moves the left HST 12 to the left. Output to the left electric motor 40L so that the rotation speed is the same as that of the right HST13. If it is determined that the left and right rotations are the same, the output to the transmission switching clutch solenoid 23a is stopped and returned to the straight traveling state.
[0031]
When the combiner 1 is finely adjusted in the left direction to adjust the straight line from the straight traveling state, when the operator operates the left direction correction switch 10 installed on the steering lever 7, the microcomputer unit 50 causes the transmission switching clutch solenoid. 23a to operate the transmission switching means 9 to output to the left electric motor 40L so that the left HST 12 decelerates by a predetermined rotation (by a slight amount) for a fixed time, and then returns to the straight running state after a fixed time has elapsed. For this purpose, a predetermined amount is output in the speed increasing direction, and the output is slightly corrected in the left direction by stopping the output of the transmission switching clutch solenoid 23a.
[0032]
The right turn and the instantaneous direction correction in the right direction can be similarly performed by the right turn operation of the steering lever 7 and the operation of the right direction correction switch 11.
[0033]
The combine 1 having the HST transmission structure configured as described above is driven so that the two HSTs 12 and 13 paired with the left and right traveling wheels 17 and 18 can be shifted by operating the rotation adjusting mechanism 40 with the main transmission lever 8. At the same time, in the traveling vehicle in which the two HSTs 12 and 13 are selected and operated by the steering operation means 7 to transmit straight travel, left turn and right turn, the two HSTs 12 and 13 and the traveling wheels 17 and 18 are transmitted. During the transmission system, the left and right traveling wheels 17 and 18 are driven by the individual HSTs 12 and 13 by the selection operation of the steering operation means 7 to perform left turn and right turn, and transmission of one HST 12 is performed. The transmission switching means 9 is provided for causing the left and right traveling wheels 17 and 18 to transmit simultaneously and travel straight by only the other HST 13 in a state in which is cut off.
[0034]
Accordingly, when the steering lever 7 is in the upright posture shown in FIGS. 2 and 3, the transmission switching means 9 causes the left and right traveling with the power of only one of the two HSTs 12 and 13, that is, the right HST 13 in this example. Since the wheels 17 and 18 are simultaneously rotated at the same time, the airframe can be moved straight (which HST is to be stopped is determined by operating conditions, the structure of the apparatus, etc.).
[0035]
At this time, the other left HST 12 idles in a no-load state, so even if the two HSTs have a difference in hydraulic characteristics or the like, they can be driven efficiently by one HST, so there is a problem such as horsepower loss. Does not occur.
[0036]
In addition, the other HST is rotated synchronously with the above one via the input gear 16, so that when the switching operation from the straight traveling direction transmission to the left and right turning transmission is performed, the switching is smoothly performed without shock or the like. Transmission can be performed.
[0037]
Further, as shown in FIG. 4, the transmission switching means 9 of the HST transmission structure has a case 2a on the upper side of the transmission system close to the two HST sides on the upper side of the transmission system to the traveling wheels 17, 18. Since it can be installed on one side with good maintainability, there are advantages such as improved assemblability and ease of inspection and repair.
[0038]
Further, in the traveling vehicle that selects and operates the two HSTs 12 and 13 that are paired with the left and right traveling wheels 17 and 18 to transmit straight traveling, left-turning, and right-turning, the two HSTs 12 and 13 and the traveling wheels 17 are used. , 18 is provided with transmission switching means 9 for causing the left and right traveling wheels 17, 18 to rotate simultaneously by the other HST 13 while the transmission of one HST 12 is cut off, When the HST 17 and 18 are provided with a rotation adjusting mechanism 40, and the transmission switching means 9 and the rotation adjusting mechanism 40 are connected so that they can be turned by the left direction correction switch 10 and the right direction correction switch 11, and the left direction correction switch 10 is turned on. When the left correction switch 10 is turned on, the left turn is instantaneously performed and the right direction correction switch 11 is turned on. Configured to cause basis.
[0039]
Then, during straight running, when the left direction correction switch 10 or the right direction correction switch 11 is turned ON, the corresponding rotation adjustment mechanism 40 is operated to rotate the motor shaft 12M or the motor shaft 13M to set the transmission switching means. 9, the traveling wheel 17 or the traveling wheel 18 is transmitted while the other is instantaneously decelerated, so that the direction is smoothly corrected by fine adjustment of the right turn of the left turn of the airframe. Combine work along planted cereals can be made appropriate.
[0040]
In addition, by configuring as described above, a mechanical adjustment mechanism can be omitted in the HST transmission structure as in the conventional device, so that a simple and inexpensive configuration can be achieved, and maintenance work can be simplified. There are features such as being able to.
[0041]
The steering operation means 7 is not limited to the steering lever 7 and may be a switch instead of the steering lever 7. Further, the rotation adjusting mechanism 40 can select a desired turning speed by making the transmission motor 40 variable by a volume or the like. In the illustrated example, a traveling device in which a crawler is wound around a traveling wheel is shown, but the traveling wheel may be a tire.
[0042]
【The invention's effect】
As is apparent from the above description, the HST transmission structure of the traveling vehicle of the present invention shifts the two HSTs 12 and 13 paired with the left and right traveling wheels 17 and 18 by operating the rotation adjusting mechanism 40 with the main transmission lever 8. In a traveling vehicle that drives the two HSTs 12 and 13 by the steering operation means 7 and transmits them in a straight travel, a left turn, and a right turn, the two HSTs 12 and 13 are moved to the running wheels 17. , 18, the left and right traveling wheels 17, 18 are driven by the individual HSTs 12, 13 by the selection operation of the steering operation means 7, respectively, to turn left and right, and one HST 12 In the state where the transmission is cut off, only the other HST 13 is used to provide the transmission switching means 9 that causes the left and right traveling wheels 17 and 18 to transmit simultaneously and travel straight.
[0043]
Accordingly, the transmission of the straight running, the left turn, and the right turn can be smoothly performed by switching the transmission switching means 9 between the two HSTs. Further, since the straight traveling is performed by only one HST, efficient transmission can be performed.
[0044]
Further, according to the present invention, the left and right traveling wheels 17 and 18 are driven by the single HSTs 12 and 13 so that the rotations of both traveling wheels 17 and 18 are reliably aligned, so that traveling with excellent straightness can be performed very easily. it can.
[Brief description of the drawings]
FIG. 1 is a perspective view of a combine equipped with an HST transmission structure.
FIG. 2 is a perspective view showing a control unit of FIG. 1;
FIG. 3 is a plan view showing the steering lever of FIG. 2;
4 is a transmission diagram showing the configuration of the transmission of FIG. 1. FIG.
FIG. 5 is a control block diagram.
[Explanation of symbols]
1 Combine (travel vehicle)
2 Transmission 5 Steering part 7 Steering lever 9 Coupling clutch 10 Left direction correction switch 11 Right direction correction switch 17, 18 Traveling wheel 40 Rotation adjustment mechanism (transmission motor)

Claims (1)

左右の走行輪17、18と対となる、それぞれ一対の油圧ポンプと油圧モータにより構成されている2つのHST12、13を主変速レバー8で回転調整機構40を操作して変速可能に駆動するとともに、前記2つのHST12、13を操向操作手段7によって選択操作して直進操行と左旋回と右旋回の伝動を行う走行車輛において、前記2つのHST12、13を走行輪17、18間の伝動系中に、操向操作手段7の選択操作によって、左右の走行輪17、18をそれぞれ単独のHST12、13により駆動させて左旋回と右旋回を行うとともに、一方のHST12の油圧モータからの伝動を切断した状態で他方のHST13の油圧モータのみによって、左右の走行輪17、18を同時伝動させて直進走行させる伝動切替手段9を設けた走行車輛のHST伝動構造。The HSTs 12 and 13, which are paired with the left and right traveling wheels 17 and 18, each composed of a pair of hydraulic pumps and hydraulic motors, are driven by the main transmission lever 8 to operate the rotation adjustment mechanism 40 so that the gears can be shifted. In the traveling vehicle in which the two HSTs 12 and 13 are selected and operated by the steering operation means 7 to perform the straight running operation, the left turn and the right turn transmission, the two HSTs 12 and 13 are transmitted between the running wheels 17 and 18. In the system, the left and right traveling wheels 17 and 18 are driven by the single HST 12 and 13 respectively by the selection operation of the steering operation means 7 to perform left turn and right turn, and from the hydraulic motor of one HST 12 An HST transmission structure for a traveling vehicle provided with transmission switching means 9 for transmitting the left and right traveling wheels 17 and 18 simultaneously and traveling straight by only the hydraulic motor of the other HST 13 with the transmission disconnected.
JP2002290566A 2002-10-03 2002-10-03 HST transmission structure of traveling vehicle Expired - Fee Related JP4116389B2 (en)

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