JP2002362438A - Working vehicle - Google Patents
Working vehicleInfo
- Publication number
- JP2002362438A JP2002362438A JP2001176804A JP2001176804A JP2002362438A JP 2002362438 A JP2002362438 A JP 2002362438A JP 2001176804 A JP2001176804 A JP 2001176804A JP 2001176804 A JP2001176804 A JP 2001176804A JP 2002362438 A JP2002362438 A JP 2002362438A
- Authority
- JP
- Japan
- Prior art keywords
- traveling
- wheels
- wheel
- turning
- driving
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000007246 mechanism Effects 0.000 claims abstract description 18
- 238000005096 rolling process Methods 0.000 claims description 61
- 230000003028 elevating effect Effects 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 description 33
- 230000008859 change Effects 0.000 description 28
- 230000004048 modification Effects 0.000 description 16
- 238000012986 modification Methods 0.000 description 16
- 230000001965 increasing effect Effects 0.000 description 10
- 238000005299 abrasion Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000001141 propulsive effect Effects 0.000 description 2
- 238000003971 tillage Methods 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 238000009313 farming Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
Landscapes
- Agricultural Machines (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は例えば圃場の耕耘作
業などを行う農用トラクタまたは田植機またはコンバイ
ンまたは圃場管理車などの作業車に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working vehicle such as a farm tractor, a rice transplanter, a combine or a field management vehicle for tilling work in a field.
【０００２】[0002]
【発明が解決しようとする課題】従来、左右一対の後走
行輪または左右一対の走行クローラを装設するトラクタ
などにおいて、接地長が長いので横すべり抵抗が大き
く、旋回性が悪く、圃場枕地でのスピンターンなど狭少
場所での方向転換を容易に行い得ないと共に、走行輪ま
たは走行クローラの路上走行時の摩耗損傷を容易に低減
し得ず、走行伝動構造及び支持構造の簡略化並びに方向
転換などの旋回操作の簡略化並びに旋回機能の向上など
を容易に図り得ない等の問題がある。また、前走行輪を
駆動し、かつ前走行輪を操舵する構造では、圃場枕地で
のスピンターンを行えないと共に、湿田や後進時の旋回
で前走行輪が泥土に埋まり易く、前走行輪の後側に走行
クローラを設けて走行力を確保しても、旋回性能の向上
並びに旋回時の泥押し低減などを容易に図り得ない等の
問題がある。Conventionally, a tractor equipped with a pair of left and right rear traveling wheels or a pair of left and right traveling crawlers has a long ground contact length, has a large side slip resistance, has a poor turning performance, and has a disadvantage in a field headland. Direction change in a narrow place such as a spin turn cannot be easily performed, and wear damage of a traveling wheel or a traveling crawler when traveling on a road cannot be easily reduced. There is a problem that simplification of turning operation such as conversion and improvement of turning function cannot be easily achieved. In addition, in the structure that drives the front running wheel and steers the front running wheel, it is not possible to perform a spin turn in a headland on a field, and it is easy for the front running wheel to be buried in mud when turning in a wetland or in reverse, and the front running wheel is However, even if a traveling crawler is provided on the rear side to secure traveling force, there is a problem that it is not easy to improve turning performance and reduce mud pushing during turning.
【０００３】[0003]
【課題を解決するための手段】然るに、本発明は、エン
ジンの出力を強制デフ機構を介して左右の駆動走行体に
伝えると共に、操向操作具及び変速操作具の操作により
左右の駆動走行体に対する駆動出力を制御する作業車に
おいて、駆動走行体とは別に車体を支える転輪を設ける
もので、例えば駆動走行体を形成する前後走行輪のいず
れかまたは走行クローラの前後側のいずれかと転輪の接
地により、駆動接地面の前後方向の接地長を短くして横
すべり抵抗を低減し得、旋回性能を向上させ得、路上走
行時などでの走行輪または走行クローラの摩耗損傷など
を低減し得、農作業を行う圃場での走行性能の向上並び
に舗装農道などの路上走行性能の向上などを容易に図り
得るものである。According to the present invention, the output of the engine is transmitted to the left and right driving traveling bodies via a forced differential mechanism, and the left and right driving traveling bodies are operated by operating the steering operation device and the speed change operation device. In a working vehicle that controls the drive output for the vehicle, a rolling wheel that supports the vehicle body is provided separately from the driving traveling body, for example, one of the front and rear traveling wheels forming the driving traveling body or one of the front and rear sides of the traveling crawler and the rolling wheel By reducing the length of the ground contact in the front-rear direction of the drive contact surface, side skid resistance can be reduced, turning performance can be improved, and wear damage to running wheels or running crawlers during road running can be reduced. In addition, it is possible to easily improve the running performance in a field where farm work is performed and the running performance on a road such as a paved farm road.
【０００４】また、駆動走行体または転輪の少なくとも
いずれか一方の接地部高さを変更させる昇降部材を設け
るもので、例えば圃場内で往復走行により農作業を行っ
ているとき、走行し乍ら昇降部材を作動させて駆動接地
面の接地長を変更し得、農作業を行う直進走行のときに
接地長を長くして走行力を確保し得、圃場枕地で方向転
換するときに接地長を短くしてスムーズに旋回し得るも
のである。[0004] Further, a lifting member for changing the height of the ground contact portion of at least one of the driving traveling body and the wheel is provided. For example, when performing agricultural work by reciprocating traveling in a field, it is necessary to raise and lower while traveling. By operating the member, the contact length of the drive contact surface can be changed, the contact length can be increased by making the contact length longer when traveling straight for agricultural work, and the traveling force can be secured.The contact length can be reduced when turning in a field headland. And turn smoothly.
【０００５】また、操向操作具の旋回操作によって昇降
部材を作動させるもので、例えば圃場枕地のスピンター
ンの操作などと連動して接地長を自動的に縮少し得、旋
回操作性の向上などを容易に図り得るものである。Further, the lifting member is actuated by turning operation of the steering operation tool. For example, the contact length is automatically reduced in conjunction with the operation of a spin turn of a headland on a field, and the turning operation is improved. This can be easily achieved.
【０００６】また、昇降部材を手動操作する昇降操作具
を設けるもので、例えば旋回時の走行状態などを作業者
が判断して必要なときに昇降部材を作動し得、走行力の
確保と旋回性を選択し乍ら農作業などを行い得るもので
ある。Further, a lifting / lowering operation tool for manually operating the lifting / lowering member is provided. For example, the worker can judge the traveling state during turning and actuate the lifting / lowering member when necessary, thereby securing traveling force and turning. Agricultural work can be performed while selecting the sex.
【０００７】また、駆動走行体によって前輪を形成し、
転輪によって後輪を形成するもので、駆動走行体を前輪
にすることによって前進直進性及び走破性を向上し得、
駆動走行体の車軸上の旋回中心で方向転換し得、キャス
タ型などの転輪を倣い走行させ得、走行クローラで形成
するのに比べ横すべりを少なくして摩耗損傷を低減し
得、例えば舗装路の旋回時に振動や本機しゃくりがなく
居住性を向上し得、かつ中耕作業またはフロントローダ
作業のときに作業部の旋回半径を小さくして作業性を向
上し得るものである。Further, a front wheel is formed by a driving traveling body,
The rear wheels are formed by the rolling wheels, and the forward traveling straightness and running performance can be improved by using the driving traveling body as the front wheel,
It can change direction at the turning center on the axle of the driving traveling body, can follow a rolling wheel such as a caster type, and can reduce abrasion by reducing side slip as compared with forming with a traveling crawler, for example, a pavement road This makes it possible to improve the livability without vibration or shaking of the machine at the time of turning, and to improve the workability by reducing the turning radius of the working portion during the middle plowing operation or the front loader operation.
【０００８】また、後輪を形成する転輪の前側に、複数
の走行輪で形成する駆動走行体を装設させるもので、四
輪構造に比べて傾斜地での安定性を向上し得、駆動輪の
多輪化により直進性及び走破性に優れて牽引力を増大し
得、しかも接地圧を低下させて転輪の沈下を少なくして
圃場の乱れを低減し得、かつ前側での走行駆動によって
作業機を前側に取付けたときの旋回性を向上し得るもの
である。In addition, a driving traveling body formed of a plurality of traveling wheels is mounted on the front side of the rolling wheel that forms the rear wheel, so that stability on an inclined ground can be improved as compared with a four-wheel structure, By increasing the number of wheels, it is possible to increase the traction force with excellent straightness and running performance, and also to reduce the contact pressure, reduce the settlement of the wheels, reduce the turbulence in the field, and by driving on the front side The turning performance when the work machine is mounted on the front side can be improved.
【０００９】また、転輪によって前輪を形成し、駆動走
行体によって後輪を形成するもので、後側の駆動走行体
の車軸上の旋回中心で方向転換し得、キャスタ型などの
転輪を倣い走行させ得、走行クローラで形成するのに比
べ横すべりを少なくして摩耗損傷を低減し得、例えば舗
装路の旋回時に振動や本機しゃくりがなく居住性を向上
し得、しかも後車軸上に旋回中心があることにより、リ
ンク機構を介して牽引する後側での作業機の装着時、作
業機の旋回半径が小さくなって作業性を向上し得るもの
である。Further, the front wheels are formed by the rolling wheels, and the rear wheels are formed by the driving traveling body. The direction can be changed at the turning center on the axle of the rear driving traveling body. It is possible to follow the running, reduce the side slip compared to forming with the traveling crawler, and reduce the wear damage.For example, when turning on a paved road, it is possible to improve the livability without vibration and scuffing, and on the rear axle. With the center of rotation, when the work machine is mounted on the rear side towed via the link mechanism, the turning radius of the work machine is reduced, and workability can be improved.
【００１０】また、前輪を形成する転輪の後側に、複数
の走行輪で形成する駆動走行体を装設するもので、四輪
構造に比べて傾斜地での安定性を向上し得、駆動輪の多
輪化により直進性及び走破性に優れて牽引力を増大し
得、しかも接地圧を低下させて転輪の沈下を少なくして
圃場の乱れを低減し得、かつ後側での走行駆動によって
作業機を後側に取付けたときの旋回性を向上し得るもの
である。[0010] Further, a driving traveling body formed by a plurality of traveling wheels is provided behind the rolling wheels that form the front wheels, so that the stability on an inclined ground can be improved as compared with a four-wheel structure, and the driving performance can be improved. By increasing the number of wheels, it is possible to increase the traction force with excellent straightness and running performance, reduce the contact pressure and reduce the settlement of the wheel, reduce the disturbance of the field, and drive the rear side Thus, the turning performance when the working machine is mounted on the rear side can be improved.
【００１１】また、走行クローラで形成する駆動走行体
の前側に転輪を設けるもので、後側の左右走行クローラ
の差動によって決まる旋回中心に前側の転輪を倣い走行
させ得、走行クローラだけの走行に比べて旋回抵抗が小
さく、かつクローラ及び転輪の摩耗を少なくし、緩旋回
からスピンターンまでスムーズに行い得、しかも前側の
転輪を前後バランスの補助手段とし、後側の走行クロー
ラによって旋回させるから、転輪による泥押しが殆んど
なく、湿田でもスムーズに旋回し得、機体後側に設ける
作業機の旋回半径を小さくして作業性を向上し得るもの
である。In addition, a rolling wheel is provided on the front side of a driving traveling body formed by a traveling crawler. The front traveling wheel can follow the turning center determined by the differential between the left and right traveling crawlers, and can travel. The rolling resistance is smaller than that of traveling, and the wear of the crawler and the rolling wheel is reduced, smooth running from gentle turning to spin turn can be performed, and the front rolling wheel is used as an auxiliary means of front and rear balance, and the rear traveling crawler As a result, there is almost no mud pushing by the rolling wheels, the vehicle can smoothly turn in wet fields, and the turning radius of the working machine provided on the rear side of the machine can be reduced to improve workability.
【００１２】また、走行クローラで形成する駆動走行体
の後側に転輪を設けるもので、前側の左右走行クローラ
の差動によって決まる旋回中心に後側の転輪を倣い走行
させ得、走行クローラだけの走行に比べて旋回抵抗が小
さく、かつクローラ及び転輪の摩耗を少なくし、緩旋回
からスピンターンまでスムーズに行い得、しかも後側の
転輪を前後バランスの補助手段とし、前側の走行クロー
ラによって旋回させるから、転輪による泥押しが殆んど
なく、湿田でもスムーズに旋回し得、機体前側に設ける
作業機の旋回半径を小さくして作業性を向上し得るもの
である。In addition, a rolling wheel is provided on the rear side of the driving traveling body formed by the traveling crawler, so that the rear rolling wheel can follow the turning center determined by the differential between the front left and right traveling crawlers and travel. The rolling resistance is smaller than that of traveling alone, the wear of crawlers and rolling wheels is reduced, smooth running from gentle turning to spin turn can be performed, and the rear rolling wheels are used as auxiliary means for balance between front and rear, and front running Since the turning is performed by the crawler, there is almost no mud pushing by the rolling wheel, the turning can be smoothly performed even in the wet field, and the turning radius of the working machine provided on the front side of the machine can be reduced to improve the workability.
【００１３】また、駆動走行体を走行輪または走行クロ
ーラによって形成し、走行輪と、走行クローラを張設さ
せるスプロケットとを、走行出力軸に互換自在に択一的
に設けるもので、走行輪を設けることによって高速走行
を可能にして機動性などを向上し得、しかも走行クロー
ラを設けることによって安定性及び牽引力及び走破性を
向上し得、走行輪をスプロケットに交換するだけでクロ
ーラ車両に仕様を容易に変更し得るものである。[0013] Further, the driving traveling body is formed by traveling wheels or traveling crawlers, and the traveling wheels and sprockets for extending the traveling crawlers are alternately provided on the traveling output shaft so as to be interchangeable. By providing a traveling crawler, it is possible to improve mobility, etc., and by providing a traveling crawler, it is possible to improve stability, traction and running performance. It can be easily changed.
【００１４】[0014]
【発明の実施の形態】以下、本発明の実施例を図面に基
づいて詳述する。図１は圃場作業などを行う農用トラク
タの側面図、図２は同平面説明図であり、トラックフレ
ーム１の前部及び中間部に左右一対の前走行輪２及び後
走行輪３を設け、トラックフレーム１の後部に左右一対
の方向転換自在なキャスタ型の転輪４を設けると共に、
トラックフレーム１に車体５を搭載させ、エンジン６、
ミッションケース７、操向ハンドル８、運転席９、主変
速レバー１０、副変速レバー１１、ＰＴＯ変速レバー１
２などを、前記車体５に配設させる。また、ヒッチ１３
付きリンク機構１４並びに昇降用油圧シリンダ１５を介
して作業機１６を車体５の後側に昇降自在に装設させ、
作業機１６のロータリ爪１７を駆動し乍ら走行させて圃
場の耕耘作業を連続的に行う。Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view of an agricultural tractor for performing field work and the like, and FIG. 2 is an explanatory plan view of the same. A pair of left and right front traveling wheels 2 and rear traveling wheels 3 are provided at a front portion and an intermediate portion of a truck frame 1. At the rear of the frame 1, a pair of left and right caster-type rolling wheels 4 that can change directions are provided.
The vehicle body 5 is mounted on the truck frame 1, and the engine 6,
Transmission case 7, steering handle 8, driver's seat 9, main shift lever 10, auxiliary shift lever 11, PTO shift lever 1
2 and the like are disposed on the vehicle body 5. Also, hitch 13
The work machine 16 is mounted on the rear side of the vehicle body 5 so as to be able to move up and down via the link mechanism 14 and the lifting hydraulic cylinder 15
The cultivation work in the field is continuously performed by driving the rotary claw 17 of the work machine 16 while driving.
【００１５】さらに、図３に示す如く、ミッションケー
ス７に油圧変速ケース１８を設け、油圧無段変速構造
（ＨＳＴ）の油圧変速ポンプ１９及びモータ２０を前記
ケース１８に内設させ、前記ポンプ１９を駆動させるポ
ンプ軸２１とエンジン６の出力軸２２を連結させると共
に、前記モータ２０によって回転させるモータ軸２３ａ
に副変速用ギヤ変速機構２３を介して走行変速出力軸２
４を連結させる。また、前記エンジン６の出力軸２２に
ＰＴＯクラッチ２５を介してＰＴＯ入力軸２６を連結さ
せ、ＰＴＯ変速用ギヤ変速機構２７を介して前記入力軸
２６にＰＴＯ出力軸２８を連結させ、前記出力軸２８を
介して機体後方の作業機１６に動力を伝える。Further, as shown in FIG. 3, a hydraulic transmission case 18 is provided in the transmission case 7, and a hydraulic transmission pump 19 and a motor 20 of a hydraulic continuously variable transmission structure (HST) are provided inside the case 18, and the pump 19 A motor shaft 23a that connects a pump shaft 21 that drives the motor and an output shaft 22 of the engine 6 and that is rotated by the motor 20
And the traveling speed change output shaft 2 through the auxiliary speed change gear mechanism 23.
4 is connected. Further, a PTO input shaft 26 is connected to an output shaft 22 of the engine 6 via a PTO clutch 25, and a PTO output shaft 28 is connected to the input shaft 26 via a PTO gear shifting mechanism 27. Power is transmitted to the working machine 16 at the rear of the machine via 28.
【００１６】さらに、強制デフ２９を形成する左右遊星
ギヤ機構３０をミッションケース７に内設させ、左右遊
星ギヤ機構３０に前記走行変速出力軸２４を連結させ、
該出力軸２４の走行変速出力を左右遊星ギヤ機構３０を
介して左右走行出力軸３１に伝え、左右の走行輪２・３
を略同一速度で同一方向に駆動し、前進または後進走行
させる。また、ミッションケース２に油圧操向ケース３
２を固定させ、油圧無段変速構造（ＨＳＴ）の油圧操向
ポンプ３３及びモータ３４を前記ケース３２に内設さ
せ、前記ポンプ３３を駆動させるポンプ軸３５に前記ポ
ンプ軸２１を連結させると共に、前記モータ３４によっ
て回転させるモータ軸３６を左右逆転ギヤ３７を介して
左右遊星ギヤ機構３０に連結させ、前記ポンプ３３とモ
ータ３４により無段変速する操向出力を左右遊星ギヤ機
構３０を介して左右走行出力軸３１に伝え、左右の走行
輪２・３を略同一速度で逆方向に駆動し、左方向または
右方向に旋回走行させる。Further, a left and right planetary gear mechanism 30 forming a forced differential 29 is provided in the transmission case 7, and the traveling speed change output shaft 24 is connected to the left and right planetary gear mechanism 30.
The output of the traveling speed change of the output shaft 24 is transmitted to the left and right traveling output shaft 31 via the left and right planetary gear mechanism 30, and the left and right traveling wheels 2.3
Are driven at substantially the same speed in the same direction to make the vehicle travel forward or backward. Also, the hydraulic steering case 3
2, a hydraulic steering pump 33 and a motor 34 of a hydraulic continuously variable transmission structure (HST) are provided in the case 32, and the pump shaft 21 is connected to a pump shaft 35 for driving the pump 33. A motor shaft 36 rotated by the motor 34 is connected to the left and right planetary gear mechanism 30 via a left and right reversing gear 37, and the steering output for continuously changing the speed by the pump 33 and the motor 34 is changed to the right and left via the left and right planetary gear mechanism 30. The traveling wheels 31 are transmitted to the traveling output shaft 31 and the left and right traveling wheels 2 and 3 are driven at substantially the same speed in the opposite directions to make a left or right turn.
【００１７】さらに、図４乃至図６に示す如く、前記操
向ハンドル８をハンドル軸３８上端側を連結させ、ハン
ドル軸３８を前記ステアリングケース３９上部に回転自
在に軸支させると共に、ステアリングケース３９上部に
操向入力軸４０上端部を回転自在に軸支させ、ハンドル
軸３８のギヤ４１と操向入力軸４０のセクタギヤ４２を
噛合させて各軸３８・４０を連結させ、ステアリングケ
ース３９内部の略中央で上下方向に操向入力軸４０を延
設させる。As shown in FIGS. 4 to 6, the steering handle 8 is connected to the upper end of a handle shaft 38, and the handle shaft 38 is rotatably supported on the upper part of the steering case 39. The upper end of the steering input shaft 40 is rotatably supported on the upper portion, and the gear 41 of the handle shaft 38 and the sector gear 42 of the steering input shaft 40 are meshed to connect the respective shafts 38 and 40. The steering input shaft 40 extends in the vertical direction substantially at the center.
【００１８】さらに、前記ステアリングケース３９に軸
受部材４３を介して変速入力軸４４を回転自在に片持ち
支持させ、変速入力軸４４を左右方向に略水平に軸支さ
せると共に、操向入力軸４０下端に自在継手４５を介し
て変速及び操向入力部材４６を固定させ、変速入力軸４
４に入力部材４６を回転自在に取付け、前記操向入力軸
４０の正逆転によって入力部材４６を略垂直な芯線回り
に正逆転させると共に、前記変速入力軸４４の正逆転に
よって略水平な芯線回りに入力部材４６を前後方向傾動
状態に回転させるもので、垂直方向の操向入力軸４０芯
線と左右水平方向の変速入力軸４４芯線とが直角交叉す
る交点に自在継手４５を取付ける。Further, the speed change input shaft 44 is rotatably cantilevered by the steering case 39 via a bearing member 43 to support the speed change input shaft 44 substantially horizontally in the left-right direction. The speed change and steering input member 46 is fixed to the lower end via a universal joint 45, and the speed change input shaft 4
The input member 46 is rotatably mounted on the rotation input shaft 4, and the input member 46 is rotated forward and reverse around a substantially vertical center line by forward and reverse rotation of the steering input shaft 40, and is rotated around a substantially horizontal center line by forward and reverse rotation of the speed change input shaft 44. The universal joint 45 is mounted at an intersection where the core of the vertical steering input shaft 40 and the core of the left and right horizontal shift input shaft 44 intersect at right angles.
【００１９】さらに、前記ステアリングケース３９の下
部前側に主変速軸４７を回転自在に軸支させ、主変速レ
バー１０を前後方向に揺動させる変速操作によって主変
速軸４７を正逆転させると共に、ロッド形主変速部材４
８及び下リンク４９を介して変速入力軸４４に主変速軸
４７を連結させ、主変速レバー１０の操作により前記入
力部材４６を変速入力軸４４芯線回りに前後方向傾動状
態に回転させる。Further, a main transmission shaft 47 is rotatably supported on the lower front side of the steering case 39, and the main transmission shaft 47 is rotated forward and backward by a shift operation of swinging the main transmission lever 10 in the front-rear direction. Main transmission member 4
The main transmission shaft 47 is connected to the transmission input shaft 44 via the transmission link 8 and the lower link 49, and the input member 46 is rotated in the front-back direction around the transmission input shaft 44 center line by operating the main transmission lever 10.
【００２０】さらに、筒軸形の操向出力軸５０を前記主
変速軸４７に回転自在に取付け、操向出力リンク５１を
操向出力軸５０に固定させると共に、ロッド形操向結合
部材５２の上端部を前記入力部材４６に連結体５３を介
して自在継手連結させ、操向結合部材５２の下端部を操
向出力リンク５１に球関継手連結させ、走行進路を変更
させる操向機構５４を構成している。Further, a steering output shaft 50 having a cylindrical shape is rotatably mounted on the main transmission shaft 47 so that the steering output link 51 is fixed to the steering output shaft 50. A steering mechanism 54 for connecting the upper end to the input member 46 via a connecting body 53 via a universal joint, connecting the lower end of the steering coupling member 52 to a steering output link 51 by a ball joint, and changing the traveling course. Make up.
【００２１】さらに、前記操向出力軸５０と略平行に変
速出力軸５５をステアリングケース３９内部に回転自在
に軸支させ、変速出力リンク５６を変速出力軸５５に固
定させると共に、ロッド形変速結合部材５７の上端部を
前記入力部材４６に連結体５３を介して自在継手連結さ
せ、変速結合部材５７の下端部を変速出力リンク５６に
球関継手連結させ、走行速度の変更並びに前後進の切換
を行う変速機構５８を構成している。Further, a transmission output shaft 55 is rotatably supported in the steering case 39 substantially in parallel with the steering output shaft 50, and a transmission output link 56 is fixed to the transmission output shaft 55, and a rod-type transmission coupling is provided. The upper end of the member 57 is universally connected to the input member 46 via a connecting body 53, and the lower end of the speed change coupling member 57 is connected to the speed change output link 56 by a ball joint. Is formed.
【００２２】さらに、互に回転自在な二重軸構造の内側
の操向操作軸５９並びに外側の変速操作軸６０をステア
リングケース３９の下部に回転自在に取付けるもので、
球関継手軸６１を介して前記変速出力軸５５に変速操作
軸６０上端部を連結させると共に、球関継手軸６２を介
して前記操向出力軸５０に操向操作軸５９上端部を連結
させる。Further, an inner steering operation shaft 59 and an outer speed change operation shaft 60 of a mutually rotatable double shaft structure are rotatably mounted on a lower portion of the steering case 39.
The upper end of the transmission operation shaft 60 is connected to the transmission output shaft 55 via a ball joint shaft 61, and the upper end of the steering operation shaft 59 is connected to the steering output shaft 50 via a ball joint shaft 62. .
【００２３】また、前記変速ケース１８の車速制御アー
ム６３に車速ロッド６４を介して前記変速操作軸６０下
端部を連結させ、車速制御アーム６３の正逆転操作によ
り第１油圧ポンプ１９斜板角調節を行って第１油圧モー
タ２０の回転数制御及び正逆転切換を行い、走行速度
（車速）の無段階変更並びに前後進の切換を行う。ま
た、前記操向ケース３２の操向制御アーム６５に旋回ロ
ッド６６を介して操向操作軸５９下端部を連結させ、操
向制御アーム６５の正逆転操作により第２油圧ポンプ３
３斜板角調節を行って第２油圧モータ３４の回転数制御
及び正逆転切換を行い、操向角度（旋回半径）の無段階
変更並びに左右旋回方向の切替を行う。Further, the lower end of the speed change operation shaft 60 is connected to the vehicle speed control arm 63 of the speed change case 18 via a vehicle speed rod 64, and the first hydraulic pump 19 adjusts the swash plate angle by the forward / reverse operation of the vehicle speed control arm 63. Is performed to control the rotation speed of the first hydraulic motor 20 and to switch between forward and reverse rotations, thereby performing stepless change of the traveling speed (vehicle speed) and switching between forward and backward traveling. Further, the lower end of the steering operation shaft 59 is connected to the steering control arm 65 of the steering case 32 via the turning rod 66, and the second hydraulic pump 3 is rotated by the forward / reverse operation of the steering control arm 65.
(3) The swash plate angle is adjusted, the rotation speed of the second hydraulic motor 34 is controlled, and the forward / reverse switching is performed. The steering angle (turning radius) is steplessly changed and the left / right turning direction is switched.
【００２４】上記のように、左右遊星ギヤ機構３０を備
える強制デフ２９をミッションケース７に内設させて左
右走行輪２・３を駆動すると共に、前記強制デフ２９に
走行無段変速ポンプ１９及びモータ２０を介して直進走
行力を伝えて左右走行輪２・３を同一方向に同一速度で
駆動させる一方、前記強制デフ２９に旋回用油圧操向ポ
ンプ３３及びモータ３４を介して旋回走行力を伝えて左
右走行輪２・３を逆方向に同一速度で駆動させるもの
で、走行無段変速ポンプ１９及びモータ２０と旋回用操
向ポンプ３３及びモータ３４の両方の出力を操向ハンド
ル８によって調整し、操向ハンドル８の操作量に応じて
走行速度を減速し、かつ左右走行輪２・３の速度差を連
続的に変化させて緩旋回及びピポットターンからスピン
ターン動作に移行させる。また、直進走行力伝達用走行
無段変速ポンプ１９及びモータ２０を出力操作する主変
速レバー１０が中立の状態下で、操向ハンドル８操作に
よる旋回出力をオフ維持すると共に、主変速レバー１０
が中立以外に操作されたとき、操向ハンドル８の旋回出
力を走行変速に比例させて変化させるもので、操向ハン
ドル８が直進位置にあるとき、主変速レバー１０の傾倒
と連動させて直進走行力伝達用走行無段変速ポンプ１９
及びモータ２０だけを前後進出力動作させ、主変速レバ
ー１０による操向ポンプ３３及びモータ３４出力調整を
中止させると共に、操向ハンドル８が直進位置以外にあ
るとき、主変速レバー１０操作により走行変速と旋回出
力調整の両方を行わせる一方、主変速レバー１０が中立
以外の状態下で、操向ハンドル８操作により旋回出力調
整と走行変速の両方を行わせる。As described above, the forced differential 29 provided with the left and right planetary gear mechanism 30 is provided in the transmission case 7 to drive the left and right traveling wheels 2 and 3, and the traveling continuously variable transmission pump 19 and The right and left traveling wheels 2 and 3 are driven in the same direction at the same speed by transmitting the straight traveling force via the motor 20, and the turning traveling force is transmitted to the forcing differential 29 via the turning hydraulic steering pump 33 and the motor 34. By transmitting the right and left traveling wheels 2 and 3 in the opposite direction at the same speed, the outputs of both the continuously variable transmission pump 19 and the motor 20 and the turning steering pump 33 and the motor 34 are adjusted by the steering handle 8. Then, the traveling speed is reduced in accordance with the operation amount of the steering handle 8 and the speed difference between the left and right traveling wheels 2 and 3 is continuously changed to shift from gentle turning and pivot turn to spin turn operation. That. Further, when the main transmission lever 10 for operating the continuously variable transmission pump 19 for transmitting the straight traveling force and the motor 20 is in the neutral state, the turning output by operating the steering handle 8 is maintained off and the main transmission lever 10 is operated.
When the steering wheel 8 is operated at a position other than neutral, the turning output of the steering wheel 8 is changed in proportion to the traveling speed. When the steering wheel 8 is in the straight running position, the vehicle moves straight in conjunction with the tilt of the main shift lever 10. Traveling continuously variable pump 19 for transmitting traveling force
And the output of the steering pump 33 and the motor 34 by the main shift lever 10 is stopped, and when the steering handle 8 is at a position other than the straight-ahead position, the traveling speed is changed by operating the main shift lever 10. While the main transmission lever 10 is in a state other than neutral, both the turning output adjustment and the traveling speed change are performed by operating the steering handle 8.
【００２５】さらに、図１、図２、図７に示す如く、チ
ェンケース６７に内装させるスプロケット６８・６９及
びチェン７０を介して、前走行輪２を設ける前車軸７１
に、前記ミッションケース７の走行出力軸３１を連結さ
せると共に、チェンケース７２に内装させるスプロケッ
ト７３・７４及びチェン７５を介して、後走行輪３を設
ける後車軸７６に前記前車軸７１を連結させる。また、
縦長の溝形ガイド７７を介して後車軸７６をトラックフ
レーム１に昇降自在に取付けると共に、電磁比例制御型
油圧昇降バルブ７８によって作動させる油圧昇降シリン
ダ７９を設け、該シリンダ７９のピストンに後車軸７６
を支持させ、左右の昇降シリンダ７９を介して左右の後
走行輪３を昇降自在に取付ける。Further, as shown in FIGS. 1, 2 and 7, a front axle 71 on which the front running wheel 2 is provided via sprockets 68 and 69 and a chain 70 which is housed in a chain case 67.
The front axle 71 is connected to a rear axle 76 on which the rear traveling wheel 3 is provided via sprockets 73 and 74 and a chain 75 provided inside the chain case 72 while connecting the traveling output shaft 31 of the transmission case 7 to the transmission output shaft 31. . Also,
A rear axle 76 is attached to the truck frame 1 via a vertically elongated groove-shaped guide 77 so as to be movable up and down, and a hydraulic lifting cylinder 79 operated by an electromagnetic proportional control type hydraulic lifting valve 78 is provided.
, And the left and right rear traveling wheels 3 are attached via the left and right lifting cylinders 79 so as to be able to move up and down.
【００２６】また、前記の後走行輪３を上昇または下降
位置の一方に昇降させる急動作或いは後走行輪３を操向
ハンドル８切れ角に比例させて昇降させる緩動作を選択
するモード切換スイッチ８０と、前記操向ハンドル８の
操作量である切れ角を検出するポテンショメータ型切角
センサ８１と、左右の後走行輪３の昇降量（支持高さ）
を検出するポテンショメータ型の左右の出量センサ８２
・８３と、前記ステアリングケース３９に設けるペダル
８４の足踏み操作によって昇降シリンダ７９を制御する
ポテンショメータ型手動調整器８５と、昇降シリンダ７
９を手動操作して後走行輪３を上昇または下降させる手
動スイッチ８６・８７と、前記作業機１６が作業状態
（接地）にあるか非作業状態（地上に上昇）にあるかを
検出する作業機センサ８８と、トラックフレーム１等の
本機の左右傾斜を検出する傾斜センサ８９と、異常を警
報するブザー９０と、前記昇降バルブ７８を、マイクロ
コンピュータで構成する旋回コントローラ９１に接続さ
せる。A mode changeover switch 80 for selecting a sudden operation for raising and lowering the rear running wheel 3 to one of the raised and lowered positions or a gentle operation for raising and lowering the rear running wheel 3 in proportion to the turning angle of the steering wheel 8. A potentiometer-type angle sensor 81 for detecting a steering angle, which is an operation amount of the steering handle 8, and a vertical movement amount (support height) of the left and right rear traveling wheels 3.
Potentiometer type left and right output sensors 82
83, a potentiometer type manual adjuster 85 for controlling the lifting cylinder 79 by stepping on a pedal 84 provided on the steering case 39, and the lifting cylinder 7
9, manual switches 86 and 87 for raising or lowering the rear running wheel 3 by manual operation of the rear wheel 3; The machine sensor 88, the tilt sensor 89 for detecting the left and right tilt of the machine such as the track frame 1, the buzzer 90 for alarming the abnormality, and the elevating valve 78 are connected to a turning controller 91 composed of a microcomputer.
【００２７】そして、図８の旋回制御フローチャートに
示す如く、前記ペダル８４または手動スイッチ８６操作
に基づき昇降シリンダ７９が上昇動作し、前後の走行輪
２・３及び転輪４を略同一平坦面に接地させていると
き、作業機センサ８８が作業機１６の上昇（非作業状
態）を検出している状態下で、モード切換スイッチ８０
の選択により急動作または緩動作の制御が行われる。前
記スイッチ８０によって急動作の制御を選択していると
き、切角センサ８１の入力に基づき、操向ハンドル８が
直進位置のとき、昇降シリンダ７９を上昇動作させ、前
後の走行輪２・３及び転輪４を略同一平坦面に接地させ
る一方、操向ハンドル８が直進位置以外のとき、昇降シ
リンダ７９を下降動作させ、後走行輪３と転輪４を接地
させ、前走行輪２を非接地状態に持上げ、後走行輪３の
推進力によって走行させて旋回させる。Then, as shown in the turning control flowchart of FIG. 8, the lifting cylinder 79 moves upward based on the operation of the pedal 84 or the manual switch 86, and the front and rear traveling wheels 2.3 and the rolling wheels 4 are placed on substantially the same flat surface. When the work implement sensor 88 is detecting that the work implement 16 has been lifted (non-working state), the mode change switch 80
The control of the sudden operation or the slow operation is performed by selecting the. When the control of the rapid operation is selected by the switch 80, based on the input of the steering angle sensor 81, when the steering handle 8 is in the straight-ahead position, the lifting cylinder 79 is raised, and the front and rear traveling wheels 2, 3 and When the steering wheel 8 is at a position other than the straight-ahead position, the lifting cylinder 79 is moved downward, the rear traveling wheel 3 and the traveling wheel 4 are grounded, and the front traveling wheel 2 is turned off. The vehicle is lifted to the ground contact state, and is run and turned by the propulsive force of the rear running wheel 3.
【００２８】また、前記スイッチ８０によって緩動作の
制御を選択しているとき、切角センサ８１と左右の出量
センサ８２・８３の入力に基づき、操向ハンドル８の切
れ角に比例した左右の後走行輪３の昇降ストローク（支
持高さ）を演算し、その昇降ストロークの演算値に基づ
き上昇または下降を判断して昇降シリンダ７９を上昇動
作または下降動作させ、操向ハンドル８の切れ角変化に
連動してシリンダ７９を作動させて後走行輪３を昇降さ
せ、後走行輪３の推進力（接地圧）を無段階に変更し乍
ら旋回させる。When the gentle operation control is selected by the switch 80, the left and right sides of the steering handle 8 are proportional to the steering angle of the steering handle 8 based on the inputs of the steering angle sensor 81 and the left and right output sensors 82 and 83. The lift stroke (support height) of the rear traveling wheel 3 is calculated, and the lift or lower is determined based on the calculated value of the lift stroke, and the lift cylinder 79 is raised or lowered to change the turning angle of the steering wheel 8. The rear running wheel 3 is raised and lowered by operating the cylinder 79 in conjunction with the rotation of the vehicle, and the rear running wheel 3 is turned while the propulsive force (ground pressure) is continuously changed.
【００２９】なお、後走行輪３を昇降させることによ
り、傾斜センサ８９が検出する左右傾斜が過大になった
とき、警報動作によってブザー９０を鳴動させ、傾斜修
正動作によって左右の昇降シリンダ７９を互に逆方向に
作動させ、左右の後走行輪３の一方を上昇させかつもう
一方を下降させ、本機の左右傾斜を一定以下に維持して
転倒などを防ぐ。By raising and lowering the rear running wheel 3, when the right and left inclination detected by the inclination sensor 89 becomes excessive, the buzzer 90 is sounded by an alarm operation and the left and right elevating cylinders 79 are mutually moved by the inclination correction operation. In this case, one of the left and right rear running wheels 3 is raised and the other is lowered, so that the left and right inclination of the machine is maintained at a certain level or less to prevent a fall.
【００３０】上記から明らかなように、エンジン６の出
力を強制デフ２９機構を介して左右の駆動走行体である
走行輪２・３に伝えると共に、操向操作具である操向ハ
ンドル８及び変速操作具である主変速レバー１０の操作
により左右の走行輪２・３に対する駆動出力を制御する
作業車において、走行輪２・３とは別に車体を支える転
輪４を設ける。そして、例えば駆動走行体を形成する後
走行輪３と転輪４の接地により、駆動接地面の前後方向
の接地長を短くして横すべり抵抗を低減させ、旋回性能
を向上させ、路上走行時などでの走行輪２・３の摩耗損
傷などを低減させ、農作業を行う圃場での走行性能の向
上並びに舗装農道などの路上走行性能の向上などを図
る。As is apparent from the above description, the output of the engine 6 is transmitted to the left and right driving wheels 2 and 3 via the forced differential 29 mechanism, and the steering handle 8 as the steering operation tool and the speed change gear are changed. In a work vehicle that controls the drive output to the left and right traveling wheels 2 and 3 by operating a main transmission lever 10 that is an operating tool, a rolling wheel 4 that supports the vehicle body is provided separately from the traveling wheels 2 and 3. For example, by grounding the rear traveling wheel 3 and the rolling wheel 4 forming the driving traveling body, the contact length in the front-rear direction of the driving contact surface is shortened to reduce the skid resistance, and the turning performance is improved. To reduce the wear and damage of the running wheels 2 and 3 in the road, to improve the running performance in the field where farm work is performed, and to improve the running performance on roads such as paved farm roads.
【００３１】また、後走行輪３の接地部高さを変更させ
る昇降部材である昇降シリンダ７９を設け、例えば圃場
内で往復走行により農作業を行っているとき、走行し乍
ら昇降シリンダ７９を作動させて駆動接地面の接地長を
変更させ、農作業を行う直進走行のときに前後走行輪２
・３の両方の接地により駆動接地長を長くして走行力を
確保させ、圃場枕地で方向転換するときに後走行輪３だ
けの接地により駆動接地長を短くしてスムーズに旋回さ
せると共に、操向ハンドル８の旋回操作によって昇降シ
リンダ７９を作動させ、例えば圃場枕地のスピンターン
の操作などと連動して前後走行輪２・３の駆動接地長を
自動的に縮少させ、旋回操作性の向上などを図る。Further, an elevating cylinder 79, which is an elevating member for changing the height of the ground contact portion of the rear running wheel 3, is provided. For example, when farm work is performed by reciprocating traveling in a field, the elevating cylinder 79 is operated while traveling. To change the contact length of the drive contact surface so that the front and rear traveling wheels 2 can be used when traveling straight for agricultural work.
3) The driving contact length is increased by both of the contact points to secure the running force, and when turning in a field headland, the driving contact length is shortened by the contact of the rear traveling wheel 3 only to smoothly turn. The lift cylinder 79 is actuated by turning the steering handle 8 to automatically reduce the drive contact length of the front and rear traveling wheels 2 and 3 in conjunction with, for example, the operation of a spin head on a field headland, thereby enabling turning operation. To improve
【００３２】また、昇降シリンダ７９を手動操作する昇
降操作具であるペダル８４を設け、例えば旋回時の走行
状態などを作業者が判断して必要なときに昇降シリンダ
７９を作動させ、走行力の確保と旋回性を選択し乍ら農
作業などを行う。Further, a pedal 84, which is a lifting / lowering operation tool for manually operating the lifting / lowering cylinder 79, is provided. Agricultural work etc. are performed while securing and turning property are selected.
【００３３】さらに、図９、図１０は、図１の変形例を
示すもので、図９のように、後走行輪３に代え、転輪４
を昇降シリンダ７９によって昇降させ、前走行輪２と転
輪４の着地により後走行輪３を地上に持上げて旋回させ
ることも行えると共に、図１０のように、後走行輪３に
代え、前走行輪２を昇降シリンダ７９によって昇降さ
せ、図９と同様に、後走行輪３を地上に持上げて旋回さ
せることも行えるもので、六輪構造で直進走行させ、四
輪構造で旋回させ、転輪４のキャスタ動作により倣い走
行させ、圃場枕地の乱れまたは泥押し等を低減させる。FIGS. 9 and 10 show a modification of FIG. 1. As shown in FIG.
Can be lifted and lowered by the lifting cylinder 79, and the rear traveling wheel 3 can be lifted to the ground by the landing of the front traveling wheel 2 and the rolling wheel 4 and turned, and as shown in FIG. The wheel 2 can be raised and lowered by the lifting cylinder 79 and the rear running wheel 3 can be lifted to the ground and turned in the same manner as in FIG. 9. The caster operation causes the vehicle to follow the running, thereby reducing disturbance or mud pushing of the field headland.
【００３４】さらに、図１１は、図９の変形例を示すも
ので、後走行輪３を省き、前走行輪２によって前輪を形
成し、転輪４によって後輪を形成するもので、走行輪２
を前輪にすることによって前進直進性及び走破性を向上
させ、走行輪２の車軸７１上の旋回中心で方向転換さ
せ、キャスタ型などの転輪４を倣い走行させ、走行クロ
ーラで形成するのに比べ横すべりを少なくして摩耗損傷
を低減させ、例えば舗装路の旋回時に振動や本機しゃく
りがなく居住性を向上させ、かつ中耕作業またはフロン
トローダ作業のときに作業部の旋回半径を小さくして作
業性を向上させる。FIG. 11 shows a modification of FIG. 9, in which the rear running wheel 3 is omitted, the front running wheel 2 forms the front wheel, and the rolling wheel 4 forms the rear wheel. 2
Is used as a front wheel to improve forward straightness and running performance, change the direction at the turning center of the running wheel 2 on the axle 71, follow the running wheel 4 such as a caster type, and form a running crawler. By reducing the side slip compared to reduce wear damage, for example, improve the livability without vibration or this machine scuffing when turning on paved roads, and reduce the turning radius of the working part during middle tillage work or front loader work Improve workability.
【００３５】さらに、図１のように、後輪を形成する転
輪４の前側に、複数の走行輪２・３で形成する駆動走行
体を装設させるもので、四輪構造に比べて傾斜地での安
定性を向上させ、駆動輪の多輪化により直進性及び走破
性に優れて牽引力を増大させ、しかも接地圧を低下させ
て転輪４の沈下を少なくして圃場の乱れを低減させ、か
つ前側での走行駆動によって作業機を前側に取付けたと
きの旋回性を向上させる。Further, as shown in FIG. 1, a drive traveling body formed by a plurality of traveling wheels 2 and 3 is mounted on the front side of a rolling wheel 4 forming a rear wheel. To increase the traction force with excellent straightness and running performance by increasing the number of drive wheels, and also reduce the contact pressure to reduce the settlement of the wheel 4 and reduce the turbulence in the field. In addition, the turning performance when the working machine is mounted on the front side by traveling driving on the front side is improved.
【００３６】さらに、図１２は、図１１の変形例を示す
もので、転輪４によって前輪を形成し、後走行輪３によ
って後輪を形成すると共に、走行輪３を駆動するチェン
ケース７２をミッションケース７に連結させるもので、
後側の駆動走行輪３の車軸７９上の旋回中心で方向転換
させ、キャスタ型などの転輪４を倣い走行させ、走行ク
ローラで形成するのに比べ横すべりを少なくして摩耗損
傷を低減させ、例えば舗装路の旋回時に振動や本機しゃ
くりがなく居住性を向上させ、しかも後車軸７６上に旋
回中心があることにより、リンク機構１４を介して牽引
する後側での作業機１６の装着時、作業機１６の旋回半
径が小さくなって作業性を向上させる。FIG. 12 shows a modification of FIG. 11, in which a front wheel is formed by the rolling wheels 4, a rear wheel is formed by the rear running wheels 3, and a chain case 72 for driving the running wheels 3 is provided. It is connected to the mission case 7,
The direction is changed at the turning center of the rear driving wheel 3 on the axle 79, and the rolling wheel 4 such as a caster type is made to follow the running, and the side slip is reduced as compared with the case formed by the traveling crawler, thereby reducing wear damage, For example, when turning on a pavement road, there is no vibration and the machine does not creep, so that the comfort is improved, and since the turning center is located on the rear axle 76, the work machine 16 on the rear side tow through the link mechanism 14 is mounted. In addition, the turning radius of the working machine 16 is reduced, thereby improving workability.
【００３７】さらに、図１３は、図９の変形例を示すも
ので、前輪を形成する転輪４の後側に、複数の前後走行
輪２・３で形成する駆動走行体を装設するもので、四輪
構造に比べて傾斜地での安定性を向上させ、駆動輪の多
輪化により直進性及び走破性に優れて牽引力を増大さ
せ、しかも接地圧を低下させて転輪４の沈下を少なくし
て圃場の乱れを低減させ、かつ後側での走行駆動によっ
て作業機１６を後側に取付けたときの旋回性を向上させ
る。FIG. 13 shows a modified example of FIG. 9, in which a drive traveling body formed by a plurality of front and rear traveling wheels 2.3 is mounted on the rear side of a rolling wheel 4 forming a front wheel. Therefore, compared to the four-wheel structure, the stability on sloping ground is improved, the number of drive wheels is increased, the straightness and running performance are improved, and the traction force is increased. The turbulence in the field is reduced to a small extent, and the turning performance when the work machine 16 is mounted on the rear side by traveling drive on the rear side is improved.
【００３８】さらに、図１４、図１５は、図１３の変形
例を示すもので、走行クローラ９２で形成する駆動走行
体の前側に転輪４を昇降自在に設け、走行出力軸３１上
の駆動用のスプロケット９３を介して張設させる左右一
対の走行クローラ９２によって車体重量を支えるもの
で、トラックフレーム１に装設させる後側の左右走行ク
ローラ９２の差動によって決まる旋回中心に前側の転輪
４を倣い走行させ、走行クローラ９２だけの走行に比べ
て前後方向の接地長が短くなって旋回抵抗が小さくな
り、かつクローラ９２及び転輪４の摩耗を少なくし、緩
旋回からスピンターンまでスムーズに行い、しかも前側
の転輪４を前後バランスの補助手段とし、後側の走行ク
ローラ９２によって旋回させるから、転輪４による泥押
しが殆んどなく、湿田でもスムーズに旋回させ、機体後
側に設ける作業機１６の旋回半径を小さくして作業性を
向上させる。FIGS. 14 and 15 show a modification of FIG. 13, in which the rolling wheels 4 are provided on the front side of a driving traveling body formed by a traveling crawler 92 so as to be able to move up and down. The weight of the vehicle is supported by a pair of left and right traveling crawlers 92 that are stretched via a sprocket 93 for use in the vehicle. 4, the traveling contact length in the front-rear direction is shorter than that of traveling only by the traveling crawler 92, the turning resistance is reduced, and the abrasion of the crawler 92 and the rolling wheel 4 is reduced. In addition, since the front wheel 4 is used as an auxiliary means of front-rear balance and is turned by the rear traveling crawler 92, there is almost no mud pushing by the wheel 4 and the wet field Also pivoted smoothly, improving the working efficiency by reducing the turning radius of the work machine 16 provided on the body rear side.
【００３９】さらに、図１６は、図１４の変形例を示す
もので、走行クローラ９２で形成する駆動走行体の後側
に転輪４を昇降自在に設けるもので、前側の左右走行ク
ローラ９２の差動によって決まる旋回中心に後側の転輪
４を倣い走行させ、走行クローラ９２だけの走行に比べ
て前後方向の接地長が短くなって旋回抵抗が小さく、か
つクローラ９２及び転輪４の摩耗を少なくし、緩旋回か
らスピンターンまでスムーズに行い、しかも後側の転輪
４を前後バランスの補助手段とし、前側の走行クローラ
９２によって旋回させるから、転輪４による泥押しが殆
んどなく、湿田でもスムーズに旋回させ、機体前側に設
ける作業機の旋回半径を小さくして作業性を向上させ
る。FIG. 16 shows a modification of FIG. 14, in which the rolling wheels 4 are provided on the rear side of the drive traveling body formed by the traveling crawlers 92 so as to be able to move up and down. The rear wheel 4 is run following the turning center determined by the differential, and the ground contact length in the front-rear direction is shortened and the turning resistance is small as compared with the running of the traveling crawler 92 alone. Is performed smoothly from the gentle turning to the spin turn, and the rear rolling wheel 4 is used as an auxiliary means of the front-rear balance, and is turned by the front traveling crawler 92, so that there is almost no mud pushing by the rolling wheel 4. In addition, the turning can be smoothly performed even in a wet field, and the turning radius of the working machine provided on the front side of the machine can be reduced to improve workability.
【００４０】さらに、図１７は、図１の変形例を示すも
ので、駆動走行体を前後走行輪２・３または走行クロー
ラ９２によって形成し、前後走行輪２・３と、走行クロ
ーラ９２を張設させる前後スプロケット９３・９４と
を、走行出力軸である前後車軸７１・７６に互換自在に
択一的に設けるもので、図１のように、前後走行輪２・
３を設けることによって高速走行を可能にして機動性な
どを向上させ、しかも図１７のように、走行クローラ９
２を設けることによって安定性及び牽引力及び走破性を
向上させ、走行輪２・３をスプロケット９３・９４に交
換するだけでクローラ車両に仕様を変更させる。FIG. 17 shows a modification of FIG. 1, in which the driving traveling body is formed by the front and rear traveling wheels 2.3 or traveling crawlers 92, and the front and rear traveling wheels 2.3 and traveling crawlers 92 are stretched. The front and rear sprockets 93 and 94 are alternately provided to the front and rear axles 71 and 76, which are traveling output shafts, as shown in FIG.
By providing the crawlers 3, high-speed running is enabled to improve mobility and the like, and as shown in FIG.
2, the stability, traction and running performance are improved, and the crawler vehicle is changed in specifications by simply replacing the running wheels 2.3 with sprockets 93 and 94.
【００４１】さらに、図１８は、図１４の変形例を示す
もので、前後走行輪２・３を備える一般的な周知のトラ
クタ機体のフレーム１前部にキャスタ型転輪４を装設さ
せ、昇降シリンダ７９によって転輪４を下降させること
により、前輪２が地上に上昇し、後走行輪３と転輪４の
接地によって旋回させるもので、旋回時の前走行輪２の
泥押しをなくし、かつ機体後方の作業機１６の旋回半径
を小さくし、圃場枕地での方向転換をスムーズに行わせ
る。FIG. 18 shows a modification of FIG. 14, in which a caster type wheel 4 is mounted on the front of a frame 1 of a general well-known tractor body having front and rear running wheels 2.3. By lowering the rolling wheel 4 by the lifting cylinder 79, the front wheel 2 rises to the ground and turns by the grounding of the rear running wheel 3 and the rolling wheel 4, eliminating mud pushing of the front running wheel 2 during turning. In addition, the turning radius of the working machine 16 behind the machine is reduced, and the direction change at the headland on the field is smoothly performed.
【００４２】[0042]
【発明の効果】以上実施例から明らかなように本発明
は、エンジン６の出力を強制デフ２９機構を介して左右
の駆動走行体２・３に伝えると共に、操向操作具８及び
変速操作具１０の操作により左右の駆動走行体２・３に
対する駆動出力を制御する作業車において、駆動走行体
２・３とは別に車体を支える転輪４を設けるもので、例
えば駆動走行体を形成する前後走行輪２・３のいずれか
または走行クローラの前後側のいずれかと転輪４の接地
により、駆動接地面の前後方向の接地長を短くして横す
べり抵抗を低減でき、旋回性能を向上させることがで
き、路上走行時などでの走行輪２・３または走行クロー
ラの摩耗損傷などを低減でき、農作業を行う圃場での走
行性能の向上並びに舗装農道などの路上走行性能の向上
などを容易に図ることができるものである。As is apparent from the above embodiment, the present invention transmits the output of the engine 6 to the left and right driving traveling bodies 2 and 3 via the forced differential 29 mechanism, and also operates the steering operation tool 8 and the speed change operation tool. In a working vehicle for controlling the driving output to the left and right driving traveling bodies 2 and 3 by operating the driving vehicle 10, rolling wheels 4 for supporting the vehicle body are provided separately from the driving traveling bodies 2 and 3, for example, before and after the driving traveling bodies are formed. By contacting one of the traveling wheels 2 or 3 or one of the front and rear sides of the traveling crawler with the rolling wheel 4, the longitudinal contact length of the driving contact surface in the front-rear direction can be reduced to reduce the skid resistance and improve the turning performance. It is possible to reduce the wear and damage of the traveling wheels 2 and 3 or traveling crawlers at the time of traveling on the road, etc., and to easily improve the traveling performance on the field where agricultural work is performed and the traveling performance on the road such as a paved farm road. It is those that can be.
【００４３】また、駆動走行体２・３または転輪４の少
なくともいずれか一方の接地部高さを変更させる昇降部
材７９を設けるもので、例えば圃場内で往復走行により
農作業を行っているとき、走行し乍ら昇降部材７９を作
動させて駆動接地面の接地長を変更でき、農作業を行う
直進走行のときに接地長を長くして走行力を確保でき、
圃場枕地で方向転換するときに接地長を短くしてスムー
ズに旋回できるものである。Further, a lifting member 79 for changing the height of the ground contact portion of at least one of the driving traveling bodies 2 and 3 and the rolling wheels 4 is provided. For example, when farming is performed by reciprocating traveling in a field, By moving the lifting member 79 while traveling, the contact length of the drive contact surface can be changed, and the traveling force can be secured by increasing the contact length when traveling straight for agricultural work.
When turning on a field headland, the ground contact length can be shortened to enable smooth turning.
【００４４】また、操向操作具８の旋回操作によって昇
降部材７９を作動させるもので、例えば圃場枕地のスピ
ンターンの操作などと連動して接地長を自動的に縮少で
き、旋回操作性の向上などを容易に図ることができるも
のである。Further, the lifting member 79 is operated by turning operation of the steering operation tool 8, so that the ground contact length can be automatically reduced in conjunction with, for example, a spin head operation on a field headland, and the turning operability is improved. It is possible to easily improve and the like.
【００４５】また、昇降部材７９を手動操作する昇降操
作具８４を設けるもので、例えば旋回時の走行状態など
を作業者が判断して必要なときに昇降部材７９を作動で
き、走行力の確保と旋回性を選択し乍ら農作業などを行
うことができるものである。Further, an elevating operation tool 84 for manually operating the elevating member 79 is provided. For example, the operator can judge the traveling state during turning and actuate the elevating member 79 when necessary to secure the traveling force. Agricultural work and the like can be performed while selecting the turning property.
【００４６】また、駆動走行体２によって前輪を形成
し、転輪４によって後輪を形成するもので、駆動走行体
２を前輪にすることによって前進直進性及び走破性を向
上でき、駆動走行体２の車軸７１上の旋回中心で方向転
換でき、キャスタ型などの転輪４を倣い走行させること
ができ、走行クローラで形成するのに比べ横すべりを少
なくして摩耗損傷を低減でき、例えば舗装路の旋回時に
振動や本機しゃくりがなく居住性を向上でき、かつ中耕
作業またはフロントローダ作業のときに作業部の旋回半
径を小さくして作業性を向上できるものである。Further, the front wheels are formed by the driving traveling body 2 and the rear wheels are formed by the rolling wheels 4. By using the driving traveling body 2 as the front wheels, forward straightness and running performance can be improved. 2 can be turned around the center of rotation on the axle 71, and the wheels 4 of a caster type or the like can be copied and traveled, and the side slip can be reduced and abrasion damage can be reduced as compared with that formed by a traveling crawler. This makes it possible to improve the livability without vibrations and shaking of the machine when turning, and to improve the workability by reducing the turning radius of the working portion during middle tillage work or front loader work.
【００４７】また、後輪を形成する転輪４の前側に、複
数の走行輪２・３で形成する駆動走行体を装設させるも
ので、四輪構造に比べて傾斜地での安定性を向上でき、
駆動輪の多輪化により直進性及び走破性に優れて牽引力
を増大でき、しかも接地圧を低下させて転輪４の沈下を
少なくして圃場の乱れを低減でき、かつ前側での走行駆
動によって作業機を前側に取付けたときの旋回性を向上
できるものである。In addition, a driving traveling body formed by a plurality of traveling wheels 2 and 3 is mounted on the front side of the rolling wheel 4 forming the rear wheel, so that stability on an inclined ground is improved as compared with a four-wheel structure. Can,
By increasing the number of drive wheels, it is possible to increase the traction force with excellent straightness and running performance, and also to reduce the contact pressure, reduce the settlement of the rolling wheels 4 and reduce the disturbance of the field, and by driving on the front side, The turning property when the work machine is mounted on the front side can be improved.
【００４８】また、転輪４によって前輪を形成し、駆動
走行体３によって後輪を形成するもので、後側の駆動走
行体３の車軸７９上の旋回中心で方向転換でき、キャス
タ型などの転輪４を倣い走行させることができ、走行ク
ローラで形成するのに比べ横すべりを少なくして摩耗損
傷を低減でき、例えば舗装路の旋回時に振動や本機しゃ
くりがなく居住性を向上でき、しかも後車軸７６上に旋
回中心があることにより、リンク機構１４を介して牽引
する後側での作業機１６の装着時、作業機１６の旋回半
径が小さくなって作業性を向上できるものである。Also, the front wheels are formed by the rolling wheels 4 and the rear wheels are formed by the drive traveling body 3, and the direction can be changed at the turning center of the rear drive traveling body 3 on the axle 79. The rolling wheels 4 can follow the running, and can reduce abrasion damage by reducing side slip as compared with forming by a traveling crawler. Since the turning center is located on the rear axle 76, when the working machine 16 is mounted on the rear side tow through the link mechanism 14, the turning radius of the working machine 16 is reduced, and workability can be improved.
【００４９】また、前輪を形成する転輪４の後側に、複
数の走行輪２・３で形成する駆動走行体を装設するもの
で、四輪構造に比べて傾斜地での安定性を向上でき、駆
動輪の多輪化により直進性及び走破性に優れて牽引力を
増大でき、しかも接地圧を低下させて転輪４の沈下を少
なくして圃場の乱れを低減でき、かつ後側での走行駆動
によって作業機１６を後側に取付けたときの旋回性を向
上できるものである。Further, a driving traveling body formed by a plurality of traveling wheels 2 and 3 is provided behind the rolling wheel 4 forming the front wheel, and the stability on an inclined ground is improved as compared with the four-wheel structure. It is possible to increase the traction force by improving the straightness and running performance by increasing the number of drive wheels, and also to reduce the contact pressure and reduce the settlement of the wheel 4 to reduce the disturbance of the field, and The turning performance when the working machine 16 is mounted on the rear side by traveling drive can be improved.
【００５０】また、走行クローラ９２で形成する駆動走
行体の前側に転輪４を設けるもので、後側の左右走行ク
ローラ９２の差動によって決まる旋回中心に前側の転輪
４を倣い走行させることができ、走行クローラ９２だけ
の走行に比べて旋回抵抗が小さく、かつクローラ９２及
び転輪４の摩耗を少なくし、緩旋回からスピンターンま
でスムーズに行うことができ、しかも前側の転輪４を前
後バランスの補助手段とし、後側の走行クローラ９２に
よって旋回させるから、転輪４による泥押しが殆んどな
く、湿田でもスムーズに旋回でき、機体後側に設ける作
業機１６の旋回半径を小さくして作業性を向上できるも
のである。The rolling wheels 4 are provided on the front side of the driving traveling body formed by the traveling crawlers 92, and the front rolling wheels 4 follow the turning center determined by the differential of the left and right traveling crawlers 92. As compared with the traveling of the traveling crawler 92 alone, the turning resistance is small, and the wear of the crawler 92 and the rolling wheel 4 is reduced, so that the rolling can be smoothly performed from the gentle turning to the spin turn. As the auxiliary means for the front-rear balance, the turning is performed by the rear traveling crawler 92, there is almost no mud pushing by the rolling wheels 4, the turning can be smoothly performed even in wet fields, and the turning radius of the working machine 16 provided on the rear side of the machine is small. Thus, workability can be improved.
【００５１】また、走行クローラ９２で形成する駆動走
行体の後側に転輪４を設けるもので、前側の左右走行ク
ローラ９２の差動によって決まる旋回中心に後側の転輪
４を倣い走行させることができ、走行クローラ９２だけ
の走行に比べて旋回抵抗が小さく、かつクローラ９２及
び転輪４の摩耗を少なくし、緩旋回からスピンターンま
でスムーズに行うことができ、しかも後側の転輪４を前
後バランスの補助手段とし、前側の走行クローラ９２に
よって旋回させるから、転輪４による泥押しが殆んどな
く、湿田でもスムーズに旋回でき、機体前側に設ける作
業機の旋回半径を小さくして作業性を向上できるもので
ある。The rolling wheels 4 are provided on the rear side of the driving traveling body formed by the traveling crawlers 92, and the rear rolling wheels 4 follow the turning center determined by the differential between the front left and right traveling crawlers 92. The rotation resistance is smaller than the traveling of the traveling crawler 92 alone, the wear of the crawler 92 and the rolling wheel 4 is reduced, and the smooth running from the gentle turning to the spin turn can be performed. 4 is used as an auxiliary means for the front-rear balance, and is turned by the front traveling crawler 92. Therefore, there is almost no mud pushing by the rolling wheels 4, the turning can be smoothly performed even in wet fields, and the turning radius of the working machine provided on the front side of the machine is reduced. Workability can be improved.
【００５２】また、駆動走行体を走行輪２・３または走
行クローラ９２によって形成し、走行輪２・３と、走行
クローラ９２を張設させるスプロケット９３・９４と
を、走行出力軸７１・７６に互換自在に択一的に設ける
もので、走行輪２・３を設けることによって高速走行を
可能にして機動性などを向上でき、しかも走行クローラ
９２を設けることによって安定性及び牽引力及び走破性
を向上でき、走行輪２・３をスプロケット９３・９４に
交換するだけでクローラ車両に仕様を容易に変更できる
ものである。Further, a driving traveling body is formed by traveling wheels 2.3 or traveling crawlers 92, and traveling wheels 2.3 and sprockets 93/94 for extending traveling crawlers 92 are attached to traveling output shafts 71 and 76. Provided as interchangeable alternatives. Providing the traveling wheels 2 and 3 enables high-speed traveling and improves mobility, and the provision of the traveling crawler 92 improves stability, traction and running performance. The specifications can easily be changed to a crawler vehicle simply by replacing the running wheels 2.3 with the sprockets 93 94.
【図１】全体の側面図。FIG. 1 is an overall side view.
【図２】同平面説明図。FIG. 2 is an explanatory plan view of the same.
【図３】ミッションの説明図。FIG. 3 is an explanatory view of a mission.
【図４】走行変速及び操向操作部の説明図。FIG. 4 is an explanatory diagram of a traveling speed change and steering operation unit.
【図５】ステアリングケースの側面図。FIG. 5 is a side view of the steering case.
【図６】同正面図。FIG. 6 is a front view of the same.
【図７】旋回制御回路図。FIG. 7 is a turning control circuit diagram.
【図８】旋回制御フローチャート。FIG. 8 is a turning control flowchart.
【図９】図１の変形例を示す側面図。FIG. 9 is a side view showing a modification of FIG. 1;
【図１０】図１の変形例を示す側面図。FIG. 10 is a side view showing a modification of FIG. 1;
【図１１】図９の変形例を示す側面図。FIG. 11 is a side view showing a modification of FIG. 9;
【図１２】図１１の変形例を示す側面図。FIG. 12 is a side view showing a modification of FIG. 11;
【図１３】図９の変形例を示す側面図。FIG. 13 is a side view showing a modification of FIG. 9;
【図１４】図１３の変形例を示す側面図。FIG. 14 is a side view showing a modification of FIG. 13;
【図１５】図１５の平面説明図。FIG. 15 is an explanatory plan view of FIG. 15;
【図１６】図１４の変形例を示す側面図。FIG. 16 is a side view showing a modification of FIG. 14;
【図１７】図１の変形例を示す側面図。FIG. 17 is a side view showing a modification of FIG. 1;
【図１８】図１４の変形例を示す側面図。FIG. 18 is a side view showing a modification of FIG. 14;
２・３ 走行輪（駆動走行体） ４ 転輪 ６ エンジン ８ 操向ハンドル（操向操作具） １０ 主変速レバー（変速操作具） ２９ 強制デフ ７９ 昇降シリンダ（昇降部材） ８４ ペダル（昇降操作具） ９２ 走行クローラ（駆動走行体） ７１・７６ 車軸（走行出力軸） ９３・９４ スプロケット 2.3 Running wheel (drive running body) 4 Rolling wheel 6 Engine 8 Steering handle (Steering operation tool) 10 Main shift lever (Shift operation tool) 29 Forced differential 79 Elevating cylinder (elevating member) 84 Pedal (elevating operation tool) ) 92 Traveling crawler (driving traveling body) 71.76 Axle (traveling output shaft) 93.94 Sprocket
Claims (11)
左右の駆動走行体に伝えると共に、操向操作具及び変速
操作具の操作により左右の駆動走行体に対する駆動出力
を制御する作業車において、駆動走行体とは別に車体を
支える転輪を設けることを特徴とする作業車。1. A work vehicle for transmitting an output of an engine to left and right driving traveling bodies via a forced differential mechanism and controlling a driving output to the left and right driving traveling bodies by operating a steering operation tool and a shift operation tool. A work vehicle characterized by providing rolling wheels for supporting a vehicle body separately from a driving traveling body.
れか一方の接地部高さを変更させる昇降部材を設けるこ
とを特徴とする請求項１に記載の作業車。2. The work vehicle according to claim 1, further comprising an elevating member that changes a height of a ground contact portion of at least one of the driving traveling body and the rolling wheel.
を作動させることを特徴とする請求項２に記載の作業
車。3. The work vehicle according to claim 2, wherein the lifting member is operated by a turning operation of the steering operation tool.
けることを特徴とする請求項２に記載の作業車。4. The work vehicle according to claim 2, further comprising a lifting operation tool for manually operating the lifting member.
によって後輪を形成することを特徴とする請求項１に記
載の作業車。5. The work vehicle according to claim 1, wherein a front wheel is formed by the driving traveling body, and a rear wheel is formed by the rolling wheel.
行輪で形成する駆動走行体を装設させることを特徴とす
る請求項１に記載の作業車。6. The work vehicle according to claim 1, wherein a driving traveling body formed by a plurality of traveling wheels is mounted on a front side of a rolling wheel that forms a rear wheel.
によって後輪を形成することを特徴とする請求項１に記
載の作業車。7. The work vehicle according to claim 1, wherein the front wheels are formed by the rolling wheels, and the rear wheels are formed by the driving traveling body.
行輪で形成する駆動走行体を装設することを特徴とする
請求項１に記載の作業車。8. The work vehicle according to claim 1, wherein a driving traveling body formed by a plurality of traveling wheels is mounted on a rear side of the rolling wheel that forms the front wheel.
側に転輪を設けることを特徴とする請求項１に記載の作
業車。9. The work vehicle according to claim 1, wherein a rolling wheel is provided on a front side of a driving traveling body formed by a traveling crawler.
後側に転輪を設けることを特徴とする請求項１に記載の
作業車。10. The work vehicle according to claim 1, wherein a wheel is provided on a rear side of a driving traveling body formed by a traveling crawler.
ラによって形成し、走行輪と、走行クローラを張設させ
るスプロケットとを、走行出力軸に互換自在に択一的に
設けることを特徴とする請求項１に記載の作業車。11. The driving traveling body is formed by traveling wheels or traveling crawlers, and the traveling wheels and a sprocket for extending the traveling crawlers are selectively provided on a traveling output shaft so as to be interchangeable. Item 2. The work vehicle according to Item 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001176804A JP2002362438A (en) | 2001-06-12 | 2001-06-12 | Working vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001176804A JP2002362438A (en) | 2001-06-12 | 2001-06-12 | Working vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002362438A true JP2002362438A (en) | 2002-12-18 |
Family
ID=19017738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001176804A Pending JP2002362438A (en) | 2001-06-12 | 2001-06-12 | Working vehicle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002362438A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103477744A (en) * | 2013-09-30 | 2014-01-01 | 张长清 | Ridge crossing mechanism of self-propelled chassis in paddy field |
| CN103496297A (en) * | 2013-10-24 | 2014-01-08 | 张长清 | Paddy field ridge crossing mechanism on self-propelled chassis |
-
2001
- 2001-06-12 JP JP2001176804A patent/JP2002362438A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103477744A (en) * | 2013-09-30 | 2014-01-01 | 张长清 | Ridge crossing mechanism of self-propelled chassis in paddy field |
| CN103496297A (en) * | 2013-10-24 | 2014-01-08 | 张长清 | Paddy field ridge crossing mechanism on self-propelled chassis |
| CN103496297B (en) * | 2013-10-24 | 2015-11-25 | 张长清 | Paddy field self propelled chassis Yue Geng mechanism |
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