JP2548123B2 - Tractor lifting control - Google Patents

Tractor lifting control

Info

Publication number
JP2548123B2
JP2548123B2 JP60178982A JP17898285A JP2548123B2 JP 2548123 B2 JP2548123 B2 JP 2548123B2 JP 60178982 A JP60178982 A JP 60178982A JP 17898285 A JP17898285 A JP 17898285A JP 2548123 B2 JP2548123 B2 JP 2548123B2
Authority
JP
Japan
Prior art keywords
limit position
upper limit
setter
ground work
lower limit
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.)
Expired - Lifetime
Application number
JP60178982A
Other languages
Japanese (ja)
Other versions
JPS6240205A (en
Inventor
義典 土居
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Iseki Agricultural Machinery Mfg Co Ltd
Original Assignee
Iseki Agricultural Machinery Mfg Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Iseki Agricultural Machinery Mfg Co Ltd filed Critical Iseki Agricultural Machinery Mfg Co Ltd
Priority to JP60178982A priority Critical patent/JP2548123B2/en
Publication of JPS6240205A publication Critical patent/JPS6240205A/en
Application granted granted Critical
Publication of JP2548123B2 publication Critical patent/JP2548123B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Lifting Devices For Agricultural Implements (AREA)

Description

【発明の詳細な説明】 [産業上の利用分野] この発明はトラクタの昇降制御装置に関するものであ
り、特に、一本の操作レバーによって微小な昇降操作と
通常の昇降操作を可能にしたトラクタの昇降制御装置に
関するものである。
Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tractor lifting control device, and more particularly, to a tractor that enables a fine lifting operation and a normal lifting operation with a single operating lever. The present invention relates to a lifting control device.

[従来技術] 従来は、対地作業機を微小に上昇又は下降操作する微
小昇降レバーと、通常の大きさに上昇又は下降操作する
昇降レバーを夫々、個別に設けている。また、公報の中
には、類似技術を開示するものとして、実開昭58−1304
05号公報や実開昭57−183822号公報が存在する。
[Prior Art] Conventionally, a fine lifting lever for slightly raising or lowering the ground work machine and a lifting lever for raising or lowering to a normal size are individually provided. In addition, in the official gazette, it is disclosed in Japanese Utility Model Publication No. 58-1304
There are 05 publications and Japanese Utility Model Publication No. 57-183822 publications.

[発明が解決しようとする課題] 対地作業機の作業高さを所定位置に例えば下降操作す
る際には、まず、昇降レバーを下降位置に操作して略、
所定位置近くに下降させ、次に、微小昇降レバーを操作
して僅かに、例えば下降させることによって所定位置に
対地作業機を制御することになるが、走行舵取操作を行
いながら2種類の昇降レバーを、夫々、上昇方向又は下
降方向に間違いなく操作することは、むつかしいもので
あって、対地作業機の位置を注視しながら、上記2種類
の操作レバーを誤りなくその都度手で握って操作するに
は充分な熟練を必要とするものである。
[Problems to be Solved by the Invention] When lowering the working height of a ground work machine to a predetermined position, for example, first, the lifting lever is moved to the lower position, and
The ground work machine is controlled to a predetermined position by lowering it to a predetermined position and then slightly lowering it, for example, by operating a small elevating lever. It is difficult to operate the levers in the ascending direction or the descending direction without fail, and while carefully watching the position of the ground work machine, the two types of operating levers described above should be grasped and operated without error. In order to do so, sufficient skill is required.

また、先の公報に記載されたもののうち、前者は単に
作業機の下降位置を設定する手段を開示しただけの構成
であり、しかも、この設定はアナログに設定できない不
具合がある。
Further, of the ones described in the above publication, the former merely discloses the means for setting the lowered position of the working machine, and there is a problem that this setting cannot be set to analog.

後者は一本の操作レバーで通常操作と微小操作とを可
能にした構成を開示したものであって、この装置では、
上限位置設定及び下降位置設定ができない問題点があ
る。
The latter discloses a configuration that enables a normal operation and a minute operation with a single operating lever.
There is a problem that the upper limit position and the lowering position cannot be set.

[課題が解決するための手段] この発明は、上記目的を達成せんとして提案せられた
ものであり、運転席を備えたトラクタの後部に連結され
ている対地作業機を上限位置と下限位置との間で高さ位
置を変更自在に昇降制御するトラクタの昇降制御装置で
あって、前記対地作業機の上限位置及び下限位置を設定
するためのダイヤル調節式のアナログ設定器であって互
いに近接させて設けられた上限位置設定器及び下限位置
設定器と、前記対地作業機の現在の高さ位置を検出する
ためのアナログ式リフトセンサと、前記上限位置設定器
及び下限位置設定器に対してそれらよりも前方に位置さ
せ且つ運転席近傍に設けられた一本の油圧昇降用操作レ
バーとを備え、前記操作レバーは常態では中立域となる
よう弾性的に付勢され、この操作レバーの中立域の外側
に微小操作域を、また、微小操作域の外側に通常操作域
を設け、前記操作レバーを微小操作域に置くと前記対地
作業機は微小に昇降動作し、操作レバーを通常操作域に
置くと上限位置設定器或あるいは下限位置設定器による
設定値とリフトセンサの検出値との差に応じて前記対地
作業機が上限位置設定器あるいは下限位置設定器で定め
た位置まで連続状に昇降動作するように制御する制御部
を設けたことを特徴とするトラクタの昇降制御装置の構
成とするものである。
[Means for Solving the Problems] The present invention has been proposed in order to achieve the above-mentioned object, and a ground work machine connected to a rear portion of a tractor having a driver seat is provided with an upper limit position and a lower limit position. A height control device for a tractor that controls the height of the ground work machine to be freely changeable, and is a dial-adjustable analog setting device for setting the upper limit position and the lower limit position of the ground work machine, which are close to each other. For the upper limit position setter and the lower limit position setter, an analog lift sensor for detecting the current height position of the ground work machine, and those for the upper limit position setter and the lower limit position setter. A hydraulic lifting / lowering operation lever located nearer to the driver's seat and located in front of the operation lever, the operation lever being elastically biased to a neutral region in the normal state. A small operation area is provided outside the standing area, and a normal operation area is provided outside the small operation area. When the operation lever is placed in the minute operation area, the ground work machine moves up and down slightly and the operation lever is normally operated. When placed in the area, the ground work machine continues to reach the position determined by the upper limit setter or lower limit setter according to the difference between the value set by the upper limit setter or lower limit setter and the detected value of the lift sensor. A tractor lifting / lowering control device is characterized in that a control unit for controlling the lifting / lowering operation is provided.

[作用] 操作レバーを回動して微小操作域にて微小上昇又は微
小下降させるときには、対地作業機は微小量づつで上昇
又は下降することになり、そして、該操作レバーを更に
回動して大きい操作域(通常操作域)にて大きい上昇又
は下降を為さしめんとするときは、対地作業機は大きい
操作量で連続的に上昇位置設定器もしくは下降位置設定
器で設定された位置まで上昇又は下降するのであり、之
等の操作が一本の操作レバーの回動操作には正確に行わ
れることができ、しかも上限位置設定器や下限位置設定
器はダイヤル調整式であって操作レバーの後方に離間さ
せて設けられているから操作レバーを握っているときに
これらの設定器に腕が触れ恐れがなく、また、操作レバ
ーから手を離せば操作レバーは中立域に戻されて直ちに
対地作業機が停止する。
[Operation] When the operation lever is rotated to slightly raise or lower in the minute operation range, the ground work machine is raised or lowered in minute increments, and the operation lever is further rotated. When trying to make a large ascent or descent in a large operating range (normal operating range), the ground work implement can continuously reach a position set by the ascending position setter or descending position setter with a large operation amount. Since it moves up or down, the above operation can be accurately performed for the turning operation of one operation lever, and the upper limit position setter and the lower limit position setter are dial adjustment type and the operation lever is used. Since they are spaced apart from each other, there is no risk of the arm touching these setting devices while gripping the operating lever.If you release your hand from the operating lever, the operating lever will return to the neutral range immediately. Ground work machine Stops.

[実施例] 次にこの発明の一実施例を図に基づいて説明する。第
1図に側面視を示したように、トラクタ1に対地作業機
2を、左右下部のロワーリンク3、3及び中央上部のト
ップリンク4からなる作業機連結リンク機構5によって
連結し、油圧昇降機構6のリフトシリンダ7のリフトピ
ストン8の出入動作に伴って昇降回動する左右のリフト
アーム9、9を、左右のリフトロッド10、10を介してロ
ワーリンク3、3に連結したものであって、作業者によ
って設定される上昇側の設定値又は下降側の設定値に、
対地作業機2のリフト高さを検出すべく設けてあるリフ
トセンサS1(図示例では、リフトアーム9の回動角を、
回動型ポテンショメータにて検出している)のリフト検
出値が一致するように、上昇用ソレノイド弁11又は下降
用ソレノイド弁12のオン、オフ動作指令がマイクロコン
ピュータの如きものにて構成されている制御部13から上
昇用駆動部14又は下降用駆動部15を介して増幅して出力
されるように構成されている。上昇側の設定値又は下降
側の設定値の夫々の設定操作は、ボリュームの如きもの
にて構成しているダイヤル調整式の上昇位置設定器IUと
下降位置設定器IDを、第5図に例示したようにトラクタ
1の運転席16の近くであって、操作レバー18の前後回動
操作時に当ることがないように操作レバー18の後方に適
当距離離して設け、第4図に側面視を示したように、軸
17へ回動自在に設けた操作レバー18に、カム19を取付
け、マイクロスイッチの如きものを用いた微小上昇スイ
ッチSU1、微小下降スイッチSD1、上昇スイッチSU2、下
降スイッチSD2を、夫々、機枠に取付けて、バネ20、2
1、22、23によって常態では中立に保持されている操作
レバー18を、矢線U方向に第1操作エリアの微小操作域
RUだけ回動操作するときは、カム19によって微小上昇ス
イッチSU1がオンとなり、矢線D方向に微小操作域RDだ
け操作したときは、微小下降スイッチSD1がオンとな
り、上記微小操作域RUを越えて第2操作エリアである大
きい操作範囲(通常操作域)に矢線U方向に操作したと
きは微小上昇スイッチSU1のほか、上昇スイッチSU2もオ
ンとなり、又、微小操作域RDを越えて矢線D方向に通常
操作域に操作したときは、微小下降スイッチSD1のほ
か、下降スイッチSD2もオンとなるように構成し、微小
上昇スイッチSU1がオンを続ける間は、微小量α宛、設
定値がステップ状に(即ち、α、2α、3α…の如く)
増加し、微小下降スイッチSD1がオンを続ける間は、微
小量(−β)宛、設定値がステップ状に(即ち、−β、
−2β、−3β…の如く)増加するように制御部13が作
用し、微小上昇スイッチSU1のほか、上昇スイッチSU2
オンを続ける間は、上昇位置設定器IUにて設定される上
昇位置設定値に上記微小量αが順次付加された設定値と
なり、微小下降スイッチSD1のほか、下降スイッチSD2
オンを続ける間は、下降位置設定器IDにて設定される下
降位置設定値に上記微小量(−β)が順次付加された設
定値となるように制御部13が作用して、操作レバー18が
上昇側に操作されたときは、上昇側の上記設定値にリフ
ト検出値が一致するように、又、下降側に操作されたと
きは下降側の上記設定値にリフト検出値が一致するよう
に制御部13が上昇用駆動部14又は下降用駆動部15に出力
を指令するものであって、第3図にこの制御動作をフロ
ーチャートにて示している。
[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. As shown in a side view in FIG. 1, the ground work implement 2 is connected to the tractor 1 by the work implement connection link mechanism 5 including the lower links 3 and 3 at the lower left and right and the top link 4 at the center upper part, and hydraulic lifting. The left and right lift arms 9 and 9 that move up and down with the movement of the lift piston 8 of the lift cylinder 7 of the mechanism 6 are connected to the lower links 3 and 3 via the left and right lift rods 10 and 10. The set value on the rising side or the set value on the falling side set by the operator,
A lift sensor S 1 provided to detect the lift height of the ground work implement 2 (in the illustrated example, the rotation angle of the lift arm 9 is
The ON / OFF operation command of the ascending solenoid valve 11 or the descending solenoid valve 12 is configured by a microcomputer or the like so that the lift detection values (detected by the rotary potentiometer) match. It is configured to be amplified and output from the control unit 13 via the ascending drive unit 14 or the descending drive unit 15. The setting operation for each of the ascending side setting value and the descending side setting value is illustrated in FIG. 5 by using the dial-adjustable ascending position setting device IU and descending position setting device ID, which are configured by something like a volume. As described above, it is provided near the driver's seat 16 of the tractor 1 and at a suitable distance behind the operation lever 18 so as not to hit when the operation lever 18 is rotated back and forth. A side view is shown in FIG. Like, axis
A cam 19 is attached to an operation lever 18 which is rotatably provided to 17, and a micro-raising switch SU 1 , a micro-descending switch SD 1 , a raising switch SU 2 and a descending switch SD 2 using a micro switch or the like are respectively attached. , Attached to the machine frame, springs 20 and 2
The operation lever 18, which is normally held neutral by 1, 22, and 23, is moved in the direction of the arrow U in the minute operation area of the first operation area.
When rotating only RU, the cam 19 turns on the micro-raising switch SU 1 and when operating only the micro-operating area RD in the direction of arrow D, the micro-lowering switch SD 1 turns on, and the micro operating area RU When operating in the direction of the arrow U in a large operation range (normal operation area) which is the second operation area beyond, the ascending switch SU 2 is turned on in addition to the minute ascending switch SU 1 , and the minute operating range RD is while when operating in the normal operation range in the arrow D direction beyond the addition of the micro-lowering switch SD 1, which is configured to down switch SD 2 is also turned on, the micro raising switch SU 1 continues to turn on, small The setting value is stepwise for the amount α (that is, like α, 2α, 3α ...)
As long as the value increases and the minute descent switch SD 1 continues to be turned on, the setting value is stepwise for a minute amount (-β) (that is, -β,
-2β rise, and the controller 13 acts to increase-3.beta ... As), other micro-raising switch SU 1, while raising switch SU 2 also continue on, which are set at the raised position setter IU It becomes the set value that the minute amount α is sequentially added to the position set value, and the descent position set value set by the descent position setter ID while the minute descent switch SD 1 and the descent switch SD 2 continue to be turned on. When the control unit 13 operates so that the minute amount (-β) is sequentially added to the set value and the operation lever 18 is operated to the up side, the lift detection value is added to the above set value on the up side. , And when operated to the descending side, the control unit 13 commands the ascending drive unit 14 or the descending drive unit 15 to output so that the lift detection value matches the set value on the descending side. This control operation is shown in the flow chart of FIG.

したがって、例えば操作レバー18を矢線U方向に操作
して微小操作域RUに置いている間は、リフトアーム9
は、微小宛、ステップ状に上昇を続けることになり、こ
の状態のとき、操作レバー18を第4図の中立位置Nに戻
せば、リフトアーム9はその位置で停止し、その後、操
作範囲RUを越えて矢線U方向に大きく操作すると、設定
値は上昇位置設定器IUにて設定されている上昇位置設定
値に改められてリフトアーム9は速やかに上昇すること
になり、操作レバー18をそのまま保持するときは、リフ
トアーム9は再び、微小宛、上昇を続ける。
Therefore, for example, while the operation lever 18 is operated in the direction of the arrow U and placed in the minute operation area RU, the lift arm 9
Will continue to rise in small steps, and in this state, if the operating lever 18 is returned to the neutral position N in FIG. 4, the lift arm 9 will stop at that position, and then the operating range RU When a large operation is made in the direction of the arrow U beyond the point, the set value is changed to the ascended position set value set by the ascended position setter IU, and the lift arm 9 quickly ascends. When it is held as it is, the lift arm 9 continues to move up to the minute again.

そして、このように例えば上昇位置にリフトアーム9
が保持されていても、操作レバー18を矢線D方向に操作
して微小操作域RDに置いたときは、設定値が微小量(−
β)宛、逐次減少することになってリフトアーム9は微
小宛、下降を続けることにリフトアーム9は微小宛、下
降を続けることになり、下降スイッチSD2がオンとなる
位置に操作するときは、リフトアーム9は下降位置設定
値に相当する高さまで速やかに下降するものである。
Then, in this way, for example, the lift arm 9 is moved to the raised position.
Even if is held, when the operating lever 18 is operated in the direction of the arrow D and placed in the minute operation area RD, the set value is a minute amount (-
beta) addressed, the lift arm 9 is addressed micro supposed to decrease sequentially, it the lift arm 9 is addressed micro continue falling, will continue to descend, when operating in a position lowering switch SD 2 is turned on The lift arm 9 quickly descends to a height corresponding to the set value of the lowered position.

、発明の効果] この発明に係るトラクタの昇降制御装置は上述のよう
に構成したものであって、油圧昇降用操作レバーを回動
して微小操作域に操作している間は微小量の設定値が設
定されるので、油圧昇降機構は微小量で上昇又は下降す
ることになり、操作レバーを更に回動して通常操作域に
操作している間はダイヤル調節式でアナログ式の上限位
置設定器又は下限位置設定器にて設定された設定値と検
出値との差に応じて油圧昇降機構は大きく上昇又は下降
動作することになる。
Effect of the Invention] The tractor lifting control device according to the present invention is configured as described above, and sets a small amount while the hydraulic lifting operation lever is rotated to operate in the minute operation range. Since the value is set, the hydraulic lifting mechanism will move up or down with a minute amount, and while the operating lever is further rotated to operate in the normal operating range, the dial adjustment type analog upper limit position setting The hydraulic elevating mechanism is moved up or down greatly according to the difference between the set value set by the device or the lower limit position setter and the detected value.

このように、一本の操作レバーを前後方向に動かすと
いう簡単な操作で、且つ、中立域から小さく動かすレバ
ー操作で対地作業機の高さ位置を容易に微調節でき、中
立域から大きく動かすレバー操作で対地作業機の高さ位
置に迅速に調節でき、容易な操作で対地作業機の昇降を
微小にも大きくも容易に動作させることができる。
In this way, the height position of the ground work implement can be easily fine-tuned by a simple operation of moving one operating lever in the front-back direction, and a lever operation that moves it slightly from the neutral range, and a lever that moves greatly from the neutral range. The height position of the ground work machine can be quickly adjusted by an operation, and the lifting and lowering of the ground work machine can be easily operated with a small or large amount by an easy operation.

なおかつ、上記操作レバーを用いて畦際で旋回する時
には、運転席に座る操縦者は後方を振り返ることなく操
作レバーを操作して、トラクタの後部に連結されている
対地作業機を上限位置設定器又は下限位置設定器で設定
された高さ位置まで正確に且つ迅速に昇降動作させるこ
とができることになり、旋回時に行うハンドル操作等の
他の操作を余裕をもって適確に行え旋回時の操作に必要
な熟練度が小さくて済む。例えば、畦際で旋回する際に
は、操縦者は進行方向を見ながら操作レバーを上昇側に
大きく回動させることで作業機を上限位置設定器で設定
した高さへ迅速に吊り上げ、旋回後は、操作レバーを下
降側に大きく倒すことで設定された耕深域まで迅速に作
業機を下降させることができる。よって、旋回時の操作
を迅速、容易に且つ安全に行え、また旋回前後で耕深変
動が生じることがない。
Furthermore, when turning at the edge using the operation lever, the operator sitting in the driver's seat operates the operation lever without looking back and operates the ground work implement connected to the rear part of the tractor to the upper limit position setting device. Or, it will be possible to move up and down accurately and quickly to the height position set by the lower limit position setting device, and other operations such as handle operation performed during turning can be performed with sufficient margin and necessary for operation during turning. The skill level is small. For example, when turning around a ridge, the operator swivels the operating lever to the upside while watching the direction of travel to quickly lift the work implement to the height set by the upper limit position setting device, and after turning. Can rapidly lower the work implement to the set tillage depth by tilting the operating lever to the lower side. Therefore, the operation at the time of turning can be performed quickly, easily and safely, and there is no fluctuation in the working depth before and after the turning.

また、操作レバーは、ダイヤル調節式の上限位置設定
器や下限位置設定器に対して前方に配設され、且つ相互
に関連し合う上昇位置設定器や下降位置設定器は近接さ
せて設けられているので、作業機の上限、下限位置の調
整を迅速に行うことができると共に、操作レバーを前後
に操作しているときにダイヤル調節式の2つの設定器が
誤って回される恐れがなく、操作性が著しく向上する。
Further, the operation lever is arranged in front of the dial-adjustable upper limit position setter and lower limit position setter, and the mutually related ascending position setter and descending position setter are provided close to each other. Since it is possible to adjust the upper and lower limit positions of the working machine quickly, there is no risk that the two dial-adjustable setting devices will be accidentally turned when operating the operating lever back and forth. Operability is significantly improved.

更に、操作レバーは、常態では中立域となるように付
勢されているので、操作レバーを目標位置から再び中立
域まで戻す操作が不要となって操作が簡略化され取り扱
いが容易になる。
Further, since the operation lever is normally urged to be in the neutral range, it is not necessary to return the operation lever from the target position to the neutral range again, and the operation is simplified and the handling is easy.

【図面の簡単な説明】[Brief description of drawings]

図はこの発明の一実施例を示し、第1図はトラクタの側
面図、第2図は制御回路図、第3図はフローチャート、
第4図は要部側面図、第5図は第1図の要部斜視図であ
る。 符号の説明 1……トラクタ 2……対地作業機 5……作業機連結リンク機構 6……油圧昇降機構 13……制御部 18……操作レバー S1……リフトセンサ IU……上昇位置設定器 ID……下降位置設定器
1 is a side view of a tractor, FIG. 2 is a control circuit diagram, FIG. 3 is a flow chart, and FIG.
FIG. 4 is a side view of the main part, and FIG. 5 is a perspective view of the main part of FIG. Explanation of code 1 …… Tractor 2 …… Ground work machine 5 …… Work machine connecting link mechanism 6 …… Hydraulic lifting mechanism 13 …… Control unit 18 …… Operating lever S 1 …… Lift sensor IU …… Raising position setter ID …… Descent position setting device

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】運転席を備えたトラクタの後部に連結され
ている対地作業機を上限位置と下限位置との間で高さ位
置を変更自在に昇降制御するトラクタの昇降制御装置で
あって、前記対地作業機の上限位置及び下限位置を設定
するためのダイヤル調節式のアナログ設定器であって互
いに近接させて設けられた上限位置設定器及び下限位置
設定器と、前記対地作業機の現在の高さ位置を検出する
ためのアナログ式リフトセンサと、前記上限位置設定器
及び下限位置設定器に対してそれらよりも前方に位置さ
せ且つ運転席近傍に設けられた一本の油圧昇降用操作レ
バーとを備え、前記操作レバーは常態では中立域となる
よう弾性的に付勢され、この操作レバーの中立域の外側
に微小操作域を、また、微小操作域の外側に通常操作域
を設け、前記操作レバーを微小操作域に置くと前記対地
作業機は微小に昇降動作し、操作レバーを通常操作域に
置くと上限位置設定器或あるいは下限位置設定器による
設定値とリフトセンサの検出値との差に応じて前記対地
作業機が上限位置設定器あるいは下限位置設定器で定め
た位置まで連続状に昇降動作するように制御する制御部
を設けたことを特徴とするトラクタの昇降制御装置。
1. An elevation control device for a tractor, which vertically controls a ground work machine connected to a rear portion of a tractor having a driver's seat between an upper limit position and a lower limit position. A dial-adjustable analog setting device for setting the upper limit position and the lower limit position of the ground work machine, the upper limit position setter and the lower limit position setter provided in close proximity to each other, and the current ground work machine An analog lift sensor for detecting the height position, and one hydraulic lifting / lowering lever provided near the driver's seat and located in front of the upper limit position setter and the lower limit position setter. The operating lever is elastically urged to be a neutral region in a normal state, a fine operating region is provided outside the neutral region of the operating lever, and a normal operating region is provided outside the fine operating region. The operation When the bar is placed in the minute operation area, the ground work implement moves up and down slightly, and when the operating lever is placed in the normal operation area, the difference between the value set by the upper limit position setter or the lower limit position setter and the detected value of the lift sensor is set. The tractor lifting control device is provided with a control unit that controls the ground work implement to continuously move up and down to a position determined by the upper limit position setter or the lower limit position setter according to the above.
JP60178982A 1985-08-14 1985-08-14 Tractor lifting control Expired - Lifetime JP2548123B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60178982A JP2548123B2 (en) 1985-08-14 1985-08-14 Tractor lifting control

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60178982A JP2548123B2 (en) 1985-08-14 1985-08-14 Tractor lifting control

Related Child Applications (2)

Application Number Title Priority Date Filing Date
JP4877490A Division JPH02276505A (en) 1990-02-27 1990-02-27 Lift-controlling apparatus of tractor
JP4877390A Division JPH02276504A (en) 1990-02-27 1990-02-27 Lift-controlling apparatus of tractor

Publications (2)

Publication Number Publication Date
JPS6240205A JPS6240205A (en) 1987-02-21
JP2548123B2 true JP2548123B2 (en) 1996-10-30

Family

ID=16058044

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60178982A Expired - Lifetime JP2548123B2 (en) 1985-08-14 1985-08-14 Tractor lifting control

Country Status (1)

Country Link
JP (1) JP2548123B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180113865A (en) * 2017-04-07 2018-10-17 엘에스엠트론 주식회사 Agricultural working machine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2527014B2 (en) * 1988-10-28 1996-08-21 井関農機株式会社 Hydraulic control of tractor
JPH081607Y2 (en) * 1988-11-16 1996-01-24 東洋電装株式会社 Lifting control switch for work equipment with tractor
JPH0810244Y2 (en) * 1990-04-06 1996-03-29 三菱農機株式会社 Lifting range setting device for working section in work vehicle

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6137214Y2 (en) * 1981-05-18 1986-10-28
JPS58130405U (en) * 1982-08-26 1983-09-03 三菱農機株式会社 Work equipment lifting device
JPS59110514U (en) * 1983-01-17 1984-07-25 三菱農機株式会社 Work equipment lifting control device
JPS60179128U (en) * 1984-05-09 1985-11-28 ヤンマー農機株式会社 Cutting height control device for reaper

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180113865A (en) * 2017-04-07 2018-10-17 엘에스엠트론 주식회사 Agricultural working machine
KR102087836B1 (en) * 2017-04-07 2020-03-11 엘에스엠트론 주식회사 Agricultural working machine

Also Published As

Publication number Publication date
JPS6240205A (en) 1987-02-21

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