JPH0752669A - Four-wheel-drive paddy working vehicle - Google Patents
Four-wheel-drive paddy working vehicleInfo
- Publication number
- JPH0752669A JPH0752669A JP20480493A JP20480493A JPH0752669A JP H0752669 A JPH0752669 A JP H0752669A JP 20480493 A JP20480493 A JP 20480493A JP 20480493 A JP20480493 A JP 20480493A JP H0752669 A JPH0752669 A JP H0752669A
- Authority
- JP
- Japan
- Prior art keywords
- transmission
- wheel
- front wheel
- speed
- state
- 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.)
- Granted
Links
Landscapes
- Arrangement And Driving Of Transmission Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、乗用型田植機や乗用型
直播機等の四輪駆動型水田作業車における走行系の構造
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a traveling system in a four-wheel drive type paddy field working vehicle such as a riding type rice transplanter and a riding type direct seeder.
【０００２】[0002]
【従来の技術】四輪駆動型水田作業車の一例である乗用
型田植機においては、例えば実開昭６３−５８０３３号
公報に開示されているように、走行用の前輪と後輪とが
略等しい速度で駆動される標準状態と、前輪が後輪より
も高速で駆動される増速状態とに切換操作自在な前輪変
速装置を備えているものがある。2. Description of the Related Art In a passenger type rice transplanter, which is an example of a four-wheel drive type paddy field vehicle, front and rear wheels for traveling are substantially absent as disclosed in, for example, Japanese Utility Model Laid-Open No. 63-58033. Some have a front wheel transmission that is switchable between a standard state in which they are driven at the same speed and a speed-up state in which the front wheels are driven faster than the rear wheels.
【０００３】これにより、一回の植付行程が終了して機
体が畦際に達した場合、前輪の操向操作を開始すると、
前輪変速装置が標準状態から増速状態に切換操作され、
一方のサイドブレーキペダルを踏み操作して旋回中心側
の後輪に制動を掛けると、走行用のベルト無段変速装置
を低速側に変速操作するように構成している。畦際での
旋回時に前述のような操作を行うことにより、機体全体
の速度を抑えながら、前輪を後輪よりも増速駆動し前輪
及び後輪に速度差を与えることによって、田面を荒らす
ことなく機体が滑らかに小回り旋回するのである。As a result, when one planting process is completed and the aircraft reaches the edge, when the steering operation of the front wheels is started,
The front wheel transmission is switched from the standard state to the speed increasing state,
When one of the side brake pedals is depressed to brake the rear wheel on the turning center side, the running belt continuously variable transmission is operated to shift to the low speed side. By controlling the speed of the entire aircraft by performing the above operations when turning at the edge of the ridge, the front wheels are driven faster than the rear wheels to give a speed difference between the front wheels and the rear wheels, thereby roughening the rice field. Instead, the aircraft smoothly makes a small turn.
【０００４】[0004]
【発明が解決しようとする課題】前述のような乗用型田
植機において畦際で旋回する場合、一般に前輪を右又は
左の一方に大きく操向操作して機体が旋回し始めた後
に、旋回中心側のサイドブレーキペダルを踏み操作する
ような状態となっている。In the riding type rice transplanter as described above, when turning at the edge of the ridge, generally, the front wheel is steered largely to the right or left, and after the body starts to turn, the turning center is turned. The side brake pedal on the side is operated.
【０００５】従って、前述の構成において実際に前輪及
び後輪に速度差が与えられるのは、一方のサイドブレー
キペダルを踏み操作して、前輪変速装置が増速状態に切
換操作されてからである。これにより、一方のサイドブ
レーキペダルを踏み操作してから前輪及び後輪に速度差
が与えられても少し遅く、旋回開始直後ではまだ前輪と
後輪が同じ速度で駆動される状態となって、この旋回開
始直後付近において前輪及び後輪で田面を荒らしてしま
う場合がある。本発明は前輪変速装置を装備した四輪駆
動型水田作業車において、畦際での旋回時に田面を荒ら
してしまう状態をさらに少なくすることを目的としてい
る。Therefore, in the above-mentioned structure, the speed difference is actually given to the front wheels and the rear wheels only after one of the side brake pedals is depressed and the front wheel transmission is switched to the speed increasing state. . With this, even if a speed difference is given to the front wheels and the rear wheels after depressing one of the side brake pedals, the speed is slightly slower, and immediately after the start of turning, the front wheels and the rear wheels are still driven at the same speed. Immediately after the start of turning, the front surface and the rear wheels may damage the rice field. It is an object of the present invention to further reduce the state in which a paddy field is roughened when turning around a ridge in a four-wheel drive type paddy field vehicle equipped with a front wheel transmission.
【０００６】[0006]
【課題を解決するための手段】本発明の特徴は以上のよ
うな四輪駆動型水田作業車において、次のように構成す
ることにある。つまり、エンジンからの動力を走行用の
変速装置を介して、走行用の前輪と後輪とに並列的に伝
達し、変速装置の下手側の分岐点と前輪との間の伝動系
に、前輪と後輪とが略等しい速度で駆動される標準状態
と、前輪が後輪よりも高速で駆動される増速状態とに切
換操作自在な前輪変速装置を備えると共に、機体に支持
された対地作業装置へ伝動及び伝動遮断操作を行う作業
クラッチを備えて、この作業クラッチの伝動遮断操作に
連動して、変速装置を低速側に変速操作し、且つ、前輪
変速装置を標準状態から増速状態に切換操作する切換手
段を備えてある。A feature of the present invention is that the four-wheel drive type paddy work vehicle as described above is configured as follows. That is, the power from the engine is transmitted in parallel to the front wheels and the rear wheels for traveling through the transmission for traveling, and the front wheels are transmitted to the transmission system between the branch point on the lower side of the transmission and the front wheels. And the rear wheels are driven at approximately the same speed, and the front wheels are equipped with a front wheel transmission that can be switched between a standard state in which the front wheels are driven at a higher speed than the rear wheels, and a ground work supported by the aircraft. Equipped with a work clutch to perform transmission and transmission interruption operation to the device, in conjunction with the transmission interruption operation of this work clutch, the transmission is shifted to the low speed side, and the front wheel transmission is changed from the standard state to the acceleration state. A switching means for performing a switching operation is provided.
【０００７】[0007]
【作用】前述のような四輪駆動型水田作業車において
は、一回の作業行程（植付行程等）が終了して機体が畦
際に達すると先ず、作業クラッチを伝動遮断操作して対
地作業装置を停止させてから、前輪の操向操作を行い始
めて畦際での旋回を開始する。従って、本発明のように
作業クラッチの伝動遮断操作に連動して、走行用の変速
装置を低速側に変速操作し、前輪変速装置を標準状態か
ら増速状態に切換操作するように構成すると、畦際での
旋回開始の少し前から前輪と後輪に速度差（前輪が高、
後輪が低）が与えられた状態となっているので、畦際で
旋回する場合、旋回の最初から前輪と後輪に速度差（前
輪が高、後輪が低）が与えられた状態で畦際での旋回が
行われるのである。[Operation] In the four-wheel drive type paddy work vehicle as described above, when one working stroke (planting stroke, etc.) is completed and the aircraft reaches the edge, first, the work clutch is disengaged to ground. After stopping the work device, the steering operation of the front wheels is started and the turning on the ridge is started. Therefore, as in the present invention, in conjunction with the transmission disengagement operation of the work clutch, the traveling transmission is shifted to the low speed side, and the front wheel transmission is switched from the standard state to the speed increasing state. Shortly before the start of turning at the edge, the speed difference between the front and rear wheels (high front wheel,
Since the rear wheel is low), when turning at the edge, when the speed difference (front wheel is high, rear wheel is low) is applied to the front and rear wheels from the beginning of the turn. The turn is made at the edge of the ridge.
【０００８】畦際において前輪の操向操作だけで、一方
のサイドブレーキペダルを踏み操作しないで旋回する場
合もある。これにより、従来の構造のように一方のサイ
ドブレーキペダルの踏み操作に連動して、走行用の変速
装置を低速側に変速操作するように構成した場合、畦際
において前輪変速装置のみを増速状態に切換操作して旋
回を行ってしまい、旋回時に機体の速度が速すぎる状態
となって田面を荒らしてしまう場合がある。これに対し
て本発明のような作業クラッチの伝動遮断操作は、機体
が畦際に達した際に必ず最初に行う操作なので、本発明
のように作業クラッチの伝動遮断操作に連動して走行用
の変速装置を低速側に変速操作し、前輪変速装置を増速
状態に切換操作するように構成すれば、畦際において前
輪変速装置のみを増速状態に切換操作して旋回を行って
しまうような事態は生じない。[0008] In some cases, the vehicle may turn at the edge of the ridge only by steering the front wheels without depressing one of the side brake pedals. As a result, when the traveling transmission is configured to shift to the low speed side in conjunction with the stepping operation of one of the side brake pedals as in the conventional structure, only the front wheel transmission is accelerated at the edge of the ridge. There is a case where the vehicle is turned by switching to the state and the speed of the aircraft is too fast at the time of turning, and the rice field is roughened. On the other hand, the work clutch transmission interruption operation as in the present invention is always the first operation performed when the aircraft reaches the edge, so that the work clutch transmission interruption operation is performed as in the present invention. If the transmission is operated to shift to the low speed side and the front wheel transmission is switched to the speed-increasing state, only the front wheel transmission is switched to the speed-increasing state to make a turn at the edge of the ridge. It doesn't happen.
【０００９】[0009]
【発明の効果】以上のように、作業クラッチの伝動遮断
操作に連動して走行用の変速装置を低速側に変速操作
し、前輪変速装置を増速状態に切換操作するように構成
することによって、最初から前輪と後輪に速度差（前輪
が高、後輪が低）が与えられた状態で旋回が行えるよう
になり、前輪と後輪が同じ速度で駆動された状態で旋回
することによる田面の荒れをさらに少なくすることがで
きるようになった。このように、畦際での田面の荒れを
少なくすることができれば、この後に行う畦際付近の田
植作業が楽に行えるようになる。As described above, the structure is such that the traveling transmission is shifted to the low speed side in conjunction with the transmission disengagement operation of the work clutch, and the front wheel transmission is switched to the speed increasing state. , It becomes possible to make a turn from the beginning when there is a speed difference between the front and rear wheels (front wheel is high, rear wheel is low), and the front wheel and the rear wheel are turned at the same speed. It has become possible to further reduce the roughness of the rice field. In this way, if it is possible to reduce the roughness of the paddy field at the edge of the ridge, the rice planting work near the edge of the ridge can be performed easily after this.
【００１０】又、作業クラッチの伝動遮断操作に連動し
て走行用の変速装置を低速側に変速操作し、前輪変速装
置を増速状態に切換操作するように構成すれば、前輪変
速装置のみを増速状態に切換操作して旋回を行ってしま
うような事態もないので、畦際での田面の荒れをさらに
少なくすることができる。Further, if the transmission for traveling is shifted to the low speed side in conjunction with the transmission interruption operation of the work clutch and the front wheel transmission is switched to the speed increasing state, only the front wheel transmission is operated. Since there is no situation in which the vehicle is turned to perform the switching operation to the speed-increasing state, it is possible to further reduce the roughness of the rice field on the ridge.
【００１１】[0011]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。図１及び図２に示すように、左右一対の走行用の
前輪１及び左右一対の走行用の後輪２で支持された機体
の前部にエンジン３を備え、機体の後部にリンク機構４
及び油圧シリンダ６を介して、苗植付装置５（対地作業
装置に相当）を昇降操作自在に連結して、四輪駆動型水
田作業車の一例である乗用型田植機を構成している。Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, an engine 3 is provided at a front portion of a body supported by a pair of left and right front wheels 1 for traveling and a pair of left and right rear rear wheels 2, and a link mechanism 4 is provided at a rear portion of the body.
Further, the seedling planting device 5 (corresponding to the ground work device) is connected via the hydraulic cylinder 6 so as to be capable of lifting and lowering, thereby forming a riding type rice transplanter which is an example of a four-wheel drive type paddy work vehicle.
【００１２】図２に示すように、エンジン３からの動力
は割プーリー型式の無段変速装置７（走行用の変速装置
に相当）を介して、前進２段後進１段のギヤ変速装置８
に伝達されている。そして、ギヤ変速装置８からの動力
が、伝動軸９及び後輪デフ装置１０を介して左右の後輪
２に伝達され、後輪デフ装置１０の直前から分岐した動
力が前輪変速装置１１、伝動軸１２及び前輪デフ装置１
３を介して左右の前輪１に伝達されている。As shown in FIG. 2, the power from the engine 3 is transmitted through a split pulley type continuously variable transmission 7 (corresponding to a traveling transmission) to a gear transmission 8 having two forward gears and one reverse gear.
Have been transmitted to. The power from the gear transmission 8 is transmitted to the left and right rear wheels 2 via the transmission shaft 9 and the rear wheel differential device 10, and the power branched from immediately before the rear wheel differential device 10 is transmitted to the front wheel transmission 11 and the transmission. Shaft 12 and front wheel differential device 1
It is transmitted to the left and right front wheels 1 via 3.
【００１３】図１及び図２に示すように操縦ハンドル２
３の横部に変速レバー１６が備えられて、変速レバー１
６の操作位置が制御装置１７に入力されており、無段変
速装置７を変速操作する電動シリンダ１５（切換手段に
相当）が備えられている。これにより、変速レバー１６
の操作位置に対応する変速位置となるように、制御装置
１７の操作信号に基づいて電動シリンダ１５が作動す
る。As shown in FIGS. 1 and 2, the steering handle 2
3 is provided with a gear shift lever 16 on the lateral side of the gear shift lever 1
The operation position 6 is input to the control device 17, and an electric cylinder 15 (corresponding to a switching unit) that shifts the continuously variable transmission 7 is provided. As a result, the shift lever 16
The electric cylinder 15 operates based on the operation signal of the control device 17 so that the shift position corresponds to the operation position of.
【００１４】次に、前輪変速装置１１について説明す
る。図２に示すように、伝動軸９に第１標準ギヤ１８及
び第１増速ギヤ１９が固定されており、伝動軸１２に相
対回転自在に外嵌された第２標準ギヤ２０及び第２増速
ギヤ２１が、第１標準ギヤ１８及び第１増速ギヤ１９に
各々咬合している。伝動軸１２において第２標準ギヤ２
０と第２増速ギヤ２１との間に、シフトギヤ２２がスプ
ライン構造にてスライド操作自在に外嵌されている。シ
フトギヤ２２はバネ２４で第２標準ギヤ２０との咬合側
に付勢されており、シフトギヤ２２をスライド操作して
第２増速ギヤ２１に咬合させる電動シリンダ２５（切換
手段に相当）を備えている。Next, the front wheel transmission 11 will be described. As shown in FIG. 2, a first standard gear 18 and a first speed-increasing gear 19 are fixed to the transmission shaft 9, and a second standard gear 20 and a second standard gear 20 externally fitted to the transmission shaft 12 are relatively rotatable. The high speed gear 21 meshes with the first standard gear 18 and the first speed increasing gear 19, respectively. The second standard gear 2 on the transmission shaft 12
A shift gear 22 is slidably fitted between 0 and the second speed increasing gear 21 so as to have a spline structure. The shift gear 22 is biased by a spring 24 toward the side of engagement with the second standard gear 20, and is provided with an electric cylinder 25 (corresponding to a switching means) that slides the shift gear 22 to engage with the second speed increasing gear 21. There is.
【００１５】以上の構造により、通常の走行状態ではバ
ネ２４の付勢力でシフトギヤ２２が紙面右方にスライド
して第２標準ギヤ２０に咬合しており、前輪１と後輪２
が略同じ速度で駆動される標準状態で、前輪１に動力が
伝達される。逆に、電動シリンダ２５によりシフトギヤ
２２を紙面左方にスライド操作して第２増速ギヤ２１に
咬合させると、後輪２よりも前輪１が高速で駆動される
増速状態で前輪１に動力が伝達される。With the above structure, in a normal traveling state, the shift gear 22 slides to the right side of the drawing by the urging force of the spring 24 and meshes with the second standard gear 20, and the front wheel 1 and the rear wheel 2 are engaged.
Are transmitted at substantially the same speed, and power is transmitted to the front wheels 1. On the contrary, when the shift gear 22 is slid to the left side of the drawing by the electric cylinder 25 and engaged with the second speed increasing gear 21, the front wheel 1 is powered in a speed increasing state in which the front wheel 1 is driven at a higher speed than the rear wheel 2. Is transmitted.
【００１６】図２に示すように、ギヤ変速装置８からの
動力が植付クラッチ１４（作業クラッチに相当）を介し
て苗植付装置５に伝達されており、植付クラッチ１４は
電動シリンダ２６により、伝動及び伝動遮断操作され
る。制御弁２７からの作動油の給排操作により油圧シリ
ンダ６が作動して、苗植付装置５の昇降操作が行われ、
図１及び図２に示すように前輪１を操向操作する操縦ハ
ンドル２３の右横に操作レバー２８が配置されており、
操作レバー２８の操作位置が制御装置１７に入力されて
いる。As shown in FIG. 2, the power from the gear transmission 8 is transmitted to the seedling planting device 5 via a planting clutch 14 (corresponding to a working clutch), and the planting clutch 14 is an electric cylinder 26. Thus, transmission and transmission interruption operation are performed. The hydraulic cylinder 6 is operated by the operation of supplying and discharging the hydraulic oil from the control valve 27, and the raising and lowering operation of the seedling planting device 5 is performed.
As shown in FIGS. 1 and 2, an operation lever 28 is arranged on the right side of the steering handle 23 for steering the front wheel 1.
The operation position of the operation lever 28 is input to the control device 17.
【００１７】これにより操作レバー２８を植付位置に操
作すると、制御装置１７の操作信号に基づき電動シリン
ダ２６により植付クラッチ１４が伝動側に操作され、図
１に示すように苗植付装置５が田面Ｇから設定高さに支
持されるように、制御弁２７及び油圧シリンダ６によっ
て、苗植付装置５が自動的に昇降操作される。As a result, when the operating lever 28 is operated to the planting position, the planting clutch 14 is operated to the transmission side by the electric cylinder 26 based on the operation signal of the control device 17, and the seedling planting device 5 as shown in FIG. The seedling planting device 5 is automatically moved up and down by the control valve 27 and the hydraulic cylinder 6 so that the rice plant is supported at the set height from the rice field G.
【００１８】操作レバー２８を上昇位置に操作すると、
制御装置１７の操作信号に基づき電動シリンダ２６によ
り植付クラッチ１４が伝動遮断側に操作され、制御弁２
７及び油圧シリンダ６によって、苗植付装置５が上昇操
作されるのであり、操作レバー２８を下降位置に操作す
ると、制御装置１７の操作信号に基づき電動シリンダ２
６により植付クラッチ１４が伝動遮断側に操作され、制
御弁２７及び油圧シリンダ６によって、苗植付装置５が
下降操作される。そして、操作レバー２８を中立位置に
操作すると、制御装置１７の操作信号に基づき電動シリ
ンダ２６により植付クラッチ１４が伝動遮断側に操作さ
れ、制御弁２７及び油圧シリンダ６によって、苗植付装
置５がその位置に停止操作されるのである。When the operating lever 28 is operated to the raised position,
Based on the operation signal of the control device 17, the electric cylinder 26 operates the planting clutch 14 to the transmission cutoff side, and the control valve 2
The seedling planting device 5 is operated to be raised by the hydraulic cylinder 7 and the hydraulic cylinder 6, and when the operating lever 28 is moved to the lowered position, the electric cylinder 2 is operated based on the operation signal of the control device 17.
6, the planting clutch 14 is operated to the transmission cutoff side, and the control valve 27 and the hydraulic cylinder 6 operate the seedling planting device 5 to descend. Then, when the operating lever 28 is operated to the neutral position, the planting clutch 14 is operated to the transmission cutoff side by the electric cylinder 26 based on the operation signal of the control device 17, and the seedling planting device 5 is operated by the control valve 27 and the hydraulic cylinder 6. Is stopped at that position.
【００１９】以上の構造により、一回の植付行程（操作
レバー２８は植付位置で、前輪変速装置１１はシフトギ
ヤ２２が第２標準ギヤ２０に咬合した標準状態）が終了
して機体が畦際に達すると、操作レバー２８を上昇位置
に操作して植付クラッチ１４を伝動遮断操作し、苗植付
装置５を停止させて田面Ｇから上昇させる。この操作レ
バー２８の操作により植付クラッチ１４が伝動遮断操作
されると、制御装置１７からの操作信号により電動シリ
ンダ１５が作動して変速レバー１６の操作位置に関係な
く、無段変速装置７が所定の低速度位置にまで減速操作
される。そして、この減速操作から所定時間後（例えば
２〜３秒）、電動シリンダ２５が作動して、第２標準ギ
ヤ２０に咬合していたシフトギヤ２２が、紙面左方にス
ライド操作されて第２増速ギヤ２１に咬合する。これに
より、機体全体の速度を抑えた状態で、前輪１と後輪２
に速度差（前輪１が高、後輪２が低）が与えられる。こ
のように、前輪１と後輪２に速度差（前輪１が高、後輪
２が低）が与えられた状態で図１の操縦ハンドル２３に
より前輪１の操向操作を行って、畦際での旋回を行う。
この場合、これと同時にサイドブレーキ（図示せず）に
より、旋回中心側の後輪２に制動を掛けて旋回を行う場
合もある。With the above structure, one planting stroke (the control lever 28 is in the planting position, and the front wheel transmission 11 is in the standard state in which the shift gear 22 is engaged with the second standard gear 20) is completed and the vehicle body is raised. When the time is reached, the operating lever 28 is operated to the raised position, the transmission clutch 14 is disengaged, the seedling planting device 5 is stopped, and the planting plant 14 is raised from the rice field G. When the transmission clutch 14 is operated to cut off the transmission by the operation of the operation lever 28, the electric cylinder 15 is operated by the operation signal from the control device 17 so that the continuously variable transmission 7 operates regardless of the operation position of the transmission lever 16. The speed is reduced to a predetermined low speed position. Then, after a predetermined time (for example, 2 to 3 seconds) from the deceleration operation, the electric cylinder 25 is activated, and the shift gear 22 that has been engaged with the second standard gear 20 is slid to the left side of the drawing to perform the second increase. It engages with the high speed gear 21. As a result, the front wheel 1 and the rear wheel 2 are kept in a state in which the speed of the entire aircraft is suppressed.
Is given a speed difference (front wheel 1 is high, rear wheel 2 is low). In this way, the steering wheel 23 of FIG. 1 is operated to steer the front wheels 1 while the front wheels 1 and the rear wheels 2 have a speed difference (the front wheels 1 are high, and the rear wheels 2 are low). Make a turn in.
In this case, at the same time, a side brake (not shown) may be applied to brake the rear wheel 2 on the center side of turning to make a turn.
【００２０】前述のようにして畦際での旋回が終了し機
体が次の植付行程の方向に向くと、操作レバー２８を上
昇位置から下降位置に操作し植付位置に操作して、苗植
付装置５を田面Ｇにまで下降操作する。これにより、電
動シリンダ２６により植付クラッチ１４が伝動側に操作
されて苗植付装置５が植付作動を開始し、苗植付装置５
が田面Ｇから設定高さに支持されるように、苗植付装置
５が自動的に昇降操作され始める。これと同時に制御装
置１７からの操作信号により電動シリンダ２５が作動を
停止し、第２増速ギヤ２１に咬合していたシフトギヤ２
２が、バネ２４の付勢力で紙面右方にスライド操作され
て第２標準ギヤ２０に咬合し、前輪１と後輪２が略同じ
速度で駆動される標準状態に戻るのであり、電動シリン
ダ１５が作動して無段変速装置７が、変速レバー１６の
操作位置に対応する元の変速位置に戻し操作されるので
ある。When the turning at the edge of the ridge is completed as described above and the machine body faces the direction of the next planting stroke, the operating lever 28 is operated from the raised position to the lowered position to operate the planting position, and the seedling is planted. The planting device 5 is moved down to the field G. As a result, the planting clutch 14 is operated to the transmission side by the electric cylinder 26, and the seedling planting device 5 starts the planting operation.
The seedling planting device 5 automatically starts to move up and down so that the rice seedling is supported at a set height from the rice field G. At the same time, the operation of the electric cylinder 25 is stopped by the operation signal from the control device 17, and the shift gear 2 that is engaged with the second speed increasing gear 21 is engaged.
2 is slid rightward on the paper surface by the urging force of the spring 24 and is engaged with the second standard gear 20 to return to the standard state in which the front wheel 1 and the rear wheel 2 are driven at substantially the same speed. Is operated and the continuously variable transmission 7 is returned to the original shift position corresponding to the operation position of the shift lever 16.
【００２１】又、図２に示すように操作レバー２８を植
付位置以外の位置に操作すると、前述のように無段変速
装置７が所定の低速度位置にまで減速操作され、前輪変
速装置１１が増速状態に切換操作される第１状態、無段
変速装置７が所定の低速度位置にまで減速操作されて前
輪変速装置１１は標準状態に残される第２状態、並び
に、無段変速装置７が変速レバー１６の操作位置に対応
する変速位置に残されたままで前輪変速装置１１が増速
状態に切換操作される第３状態の３つの状態を選択でき
る選択スイッチ２９を備えている。そして、操作レバー
２８を植付位置以外の位置に操作した際に、前述の選択
スイッチ２９で選択された状態を現出させる作動状態
と、選択スイッチ２９で選択される状態を現出させず
に、無段変速装置７を変速レバー１６の操作位置に対応
する変速位置に残し、前輪変速装置１１も標準状態に残
しておく停止状態の２状態に切換操作可能なメインスイ
ッチ３０を備えている。When the operating lever 28 is operated to a position other than the planting position as shown in FIG. 2, the continuously variable transmission 7 is decelerated to a predetermined low speed position as described above, and the front wheel transmission 11 is moved. Is switched to a speed increasing state, a second state in which the continuously variable transmission 7 is decelerated to a predetermined low speed position and the front wheel transmission 11 is left in the standard state, and a continuously variable transmission. The front wheel transmission 11 is provided with a selection switch 29 capable of selecting three states of a third state in which the front wheel transmission 11 is switched to the speed-up state while 7 is left in the shift position corresponding to the operation position of the shift lever 16. Then, when the operation lever 28 is operated to a position other than the planting position, the operating state in which the state selected by the selection switch 29 described above and the state selected by the selection switch 29 are not displayed. The continuously variable transmission 7 is provided with a main switch 30 that can be switched between two states of a stopped state in which the continuously variable transmission 7 is left in a shift position corresponding to the operation position of the shift lever 16 and the front wheel transmission 11 is also left in a standard state.
【００２２】〔別実施例〕前述の実施例では、走行用の
変速装置として割プーリー型式の無段変速装置７を使用
しているが、静油圧式無段変速装置やギヤ変速装置を使
用してもよい。苗植付装置５に代えて水田に種籾を直接
に播いていく直播機をリンク機構４に連結した乗用型直
播機にも本発明は適用できる。[Other Embodiments] In the above-described embodiments, the split pulley type continuously variable transmission 7 is used as the transmission for traveling, but a hydrostatic continuously variable transmission or a gear transmission is used. May be. The present invention can also be applied to a riding-type direct sowing machine in which a direct seeding machine that directly sows seed paddy in the paddy field is connected to the link mechanism 4 instead of the seedling planting device 5.
【００２３】尚、特許請求の範囲の項に図面との対照を
便利にする為に符号を記すが、該記入により本発明は添
付図面の構成に限定されるものではない。It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.
【図１】乗用型田植機の全体側面図[Fig. 1] Overall side view of the riding rice transplanter
【図２】前輪及び後輪の伝動構造、前輪変速装置等を示
す概略平面図FIG. 2 is a schematic plan view showing a front wheel and rear wheel transmission structure, a front wheel transmission, and the like.
１ 前輪 ２ 後輪 ３ エンジン ５ 対地作業装置 ７ 走行用の変速装置 １１ 前輪変速装置 １４ 作業クラッチ １５，２５ 切換手段 1 Front Wheel 2 Rear Wheel 3 Engine 5 Ground Work Device 7 Traveling Transmission 11 Front Wheel Transmission 14 Working Clutch 15, 25 Switching Means
Claims (1)
速装置（７）を介して、走行用の前輪（１）と後輪
（２）とに並列的に伝達し、 前記変速装置（７）の下手側の分岐点と前輪（１）との
間の伝動系に、前記前輪（１）と後輪（２）とが略等し
い速度で駆動される標準状態と、前記前輪（１）が後輪
（２）よりも高速で駆動される増速状態とに切換操作自
在な前輪変速装置（１１）を備えると共に、 機体に支持された対地作業装置（５）へ伝動及び伝動遮
断操作を行う作業クラッチ（１４）を備えて、この作業
クラッチ（１４）の伝動遮断操作に連動して、前記変速
装置（７）を低速側に変速操作し、且つ、前記前輪変速
装置（１１）を標準状態から増速状態に切換操作する切
換手段（１５），（２５）を備えてある四輪駆動型水田
作業車。1. Power from an engine (3) is transmitted in parallel to a front wheel (1) and a rear wheel (2) for traveling through a transmission (7) for traveling, and the transmission ( 7) A normal state in which the front wheel (1) and the rear wheel (2) are driven at substantially equal speeds in the transmission system between the lower-side branch point and the front wheel (1), and the front wheel (1). Is equipped with a front wheel transmission (11) that can be switched to a speed-up state in which it is driven at a higher speed than the rear wheels (2), and performs transmission and transmission interruption operations to the ground work device (5) supported by the machine body. A work clutch (14) for performing the work clutch (14) is provided, and the transmission (7) is shifted to a low speed side in conjunction with the transmission interruption operation of the work clutch (14), and the front wheel transmission (11) is standard. Four-wheel drive paddy field work provided with switching means (15), (25) for switching operation from the state to the speed-up state .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20480493A JP2831917B2 (en) | 1993-08-19 | 1993-08-19 | Four-wheel drive paddy working vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20480493A JP2831917B2 (en) | 1993-08-19 | 1993-08-19 | Four-wheel drive paddy working vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0752669A true JPH0752669A (en) | 1995-02-28 |
| JP2831917B2 JP2831917B2 (en) | 1998-12-02 |
Family
ID=16496645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20480493A Expired - Lifetime JP2831917B2 (en) | 1993-08-19 | 1993-08-19 | Four-wheel drive paddy working vehicle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2831917B2 (en) |
-
1993
- 1993-08-19 JP JP20480493A patent/JP2831917B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2831917B2 (en) | 1998-12-02 |
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