JP2000198462A - Turning control device for tractor - Google Patents

Turning control device for tractor

Info

Publication number
JP2000198462A
JP2000198462A JP2000000978A JP2000000978A JP2000198462A JP 2000198462 A JP2000198462 A JP 2000198462A JP 2000000978 A JP2000000978 A JP 2000000978A JP 2000000978 A JP2000000978 A JP 2000000978A JP 2000198462 A JP2000198462 A JP 2000198462A
Authority
JP
Japan
Prior art keywords
steering angle
front wheel
rear wheel
turning
brake
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
Application number
JP2000000978A
Other languages
Japanese (ja)
Inventor
Yuji Kanefuji
祐治 金藤
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 and Co Ltd
Iseki Agricultural Machinery Mfg Co Ltd
Original Assignee
Iseki and Co Ltd
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 and Co Ltd, Iseki Agricultural Machinery Mfg Co Ltd filed Critical Iseki and Co Ltd
Priority to JP2000000978A priority Critical patent/JP2000198462A/en
Publication of JP2000198462A publication Critical patent/JP2000198462A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To simplify and facilitate turning operation by providing a control means for changing a high-low speed selecting device from the low speed side over to the high speed side and braking a rear wheel braking device on the turning inside when a steering angle detecting device detects the state of the steering angle of a front wheel being operated to a specified angle or more. SOLUTION: When a detected steering angle is in a range of θ2 to θ3, a front wheel clutch is changed over to high speed. The rotation ratio of a front wheel to a rear wheel at this time is R3:R4, and the front wheel is rotated considerably faster than the rear wheel, so that the rear wheel does not slip even if making a sharp turn, thereby traveling stably. θ3 is a steering angle when turning in a minimum turning radius. When the detected steering angle gets close to θ3, a braking device on the turning inside of the rear wheel is actuated to apply a brake on that side to assist the sharp turn. In this case, the front wheel clutch is changed over to the high speed side, so that a rapid turn can be made without the front wheel becoming a brake to the rear wheel.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【産業上の利用分野】この発明は、トラクターの旋回制
御装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tractor turning control device.

【0002】[0002]

【従来技術】近年、トラクターの前輪駆動系の中に高低
速切換装置を組み込み、直進時には前後輪の周速が略等
しい低速状態となし、旋回時には前輪の周速を後輪のそ
れより略2倍程度高めて高速状態を作り出すように構成
したものが知られている。又、トラクター等において
は、後輪を制動するブレーキ装置が左右独立して設けら
れ、これらは運転者の足元に設けられた左右一対のブレ
ーキペダルを操作して左右のブレーキペダルを同時に、
あるいは個々に制動できるようにしている。
2. Description of the Related Art In recent years, a high / low speed switching device has been incorporated in a front wheel drive system of a tractor so that the front and rear wheels have substantially the same peripheral speed when traveling straight, and when turning, the peripheral speed of the front wheels is approximately two times that of the rear wheels. It is known to increase the speed by about twice to create a high-speed state. Also, in tractors and the like, braking devices for braking the rear wheels are independently provided on the left and right, and these operate a pair of left and right brake pedals provided at the feet of the driver to simultaneously operate the left and right brake pedals.
Alternatively, it can be braked individually.

【0003】高速で移動する路上走行以外は、左右のブ
レーキペダルを連結することはなく、一般の耕耘作業中
には、旋回内側の後輪を制動して小さな旋回半径で機体
を旋回させる。
[0003] Except for traveling on a road moving at a high speed, the left and right brake pedals are not connected, and during general tilling work, the rear wheel inside the turning is braked to turn the body with a small turning radius.

【0004】[0004]

【発明が解決しようとする課題】高低速切換装置を有す
るトラクターを用いて耕耘作業等を行なう場合であっ
て、最小旋回半径で機体を旋回させようと思えば、前輪
駆動系を高速状態にすると共に、旋回内側のブレーキペ
ダルを踏み込んでブレーキ装置も作動させなければなら
ず、こうした操作は、圃場端での旋回時にステアリング
ハンドル操作や油圧レバーの操作を伴うために煩雑であ
り、又、畦際での旋回時にブレーキペダルを踏み続けて
旋回することは運転者にとって負担でもある。
In the case of performing tilling work or the like using a tractor having a high / low speed switching device, if the aircraft is to be turned with a minimum turning radius, the front wheel drive system is set to a high speed state. At the same time, the brake device must be actuated by depressing the brake pedal inside the turn, and this operation is complicated because it involves operating the steering handle and hydraulic lever when turning at the edge of the field. It is also a burden for the driver to turn while continuing to depress the brake pedal when turning with the vehicle.

【0005】[0005]

【課題を解決するための手段】この発明は、前記した不
具合を解消するために提案するものであって、次のよう
な技術的手段を講じた。即ち、前輪の操向角を検出する
操向角検出装置と、前輪の駆動状態を高低速に切り換え
る高低速切換装置と、左右の後輪のうち任意の側を独立
的に制動することができる左右一対のブレーキ装置とを
有するトラクターにおいて、前輪の操向角が所定角度以
上に操作されたことを操向角検出装置が検出すると、前
記高低速切換装置を低速側から高速側に切り換え、かつ
旋回内側の後輪ブレーキ装置を制動する制御手段を設け
たことを特徴とするトラクターの旋回制御装置の構成と
する。
SUMMARY OF THE INVENTION The present invention proposes to solve the above-mentioned problems, and employs the following technical means. That is, a steering angle detection device that detects the steering angle of the front wheels, a high / low speed switching device that switches the driving state of the front wheels between high and low speeds, and any of the left and right rear wheels can be independently braked. In a tractor having a pair of left and right brake devices, when the steering angle detection device detects that the steering angle of the front wheels has been operated to a predetermined angle or more, the high / low speed switching device is switched from a low speed side to a high speed side, and A tractor turning control device is characterized in that control means for braking the rear wheel brake device inside the turning is provided.

【0006】[0006]

【発明の実施の形態】以下、図面に示す実施例に基づい
て、この発明の実施例を説明する。まず、構成から説明
すると、1はトラクターで、機枠の前部にエンジン2を
搭載してなり、ミッションケース3内にあって後向きに
軸架された伝動軸5の後端部に、後輪デフ装置6のベベ
ルギヤ7に噛み合うベベルピニオン8が取り付けられて
いる。そして、前輪駆動系のクラッチ(以下前輪クラッ
チとする)10に伝動するための互いに歯数の異なる一
対の伝動ギヤ11、12が取り付けられている。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on embodiments shown in the drawings. First, a description will be given of the structure. Reference numeral 1 denotes a tractor, which has an engine 2 mounted on a front portion of a machine frame, and has a rear wheel mounted on a rear end of a transmission shaft 5 which is mounted in a transmission case 3 in a rearward direction. A bevel pinion 8 that meshes with the bevel gear 7 of the differential device 6 is attached. A pair of transmission gears 11 and 12 having different numbers of teeth for transmission to a clutch (hereinafter referred to as a front wheel clutch) 10 of a front wheel drive system are attached.

【0007】前輪クラッチ10としては2段変速の湿式
多板クラッチが採用されており、伝動軸5と平行なクラ
ッチ軸14に、両側に低速用の受動板15,…と高速用
の受動板16,…を備えた受体18と、前記低速用の受
動板15に対応する駆動板19,…を備えた低速用のク
ラッチギヤ20と、前記高速用の受動板16に対応する
駆動板22,…を備えた高速用のクラッチギヤ23が設
けられている。
As the front wheel clutch 10, a two-speed wet multi-plate clutch is employed. A low-speed passive plate 15,... And a high-speed passive plate 16 are provided on both sides of a clutch shaft 14 parallel to the transmission shaft 5. , A driving plate 19 corresponding to the low-speed passive plate 15, a low-speed clutch gear 20, and a driving plate 22 corresponding to the high-speed passive plate 16, , A high-speed clutch gear 23 is provided.

【0008】クラッチギヤ20、23はクラッチ軸14
に対して回動自在で、それぞれが前記伝動ギヤ11、1
2に各別に噛合している。前記前輪クラッチ10は油圧
式の切替弁25と圧力制御弁26によって、伝動ギヤ1
1とクラッチギヤ20が噛合する低速、伝動ギヤ12と
クラッチギヤ23が噛合する高速、及びいずれもが切れ
た中立の3段階に切り替わるように構成している。
The clutch gears 20 and 23 are
With respect to the transmission gears 11, 1
2 meshes with each other. The front wheel clutch 10 is driven by a hydraulic switching valve 25 and a pressure control valve 26 to transmit the transmission gear 1.
1 is switched to a low speed at which the clutch gear 20 is meshed, a high speed at which the transmission gear 12 is meshed with the clutch gear 23, and a neutral stage in which all are disconnected.

【0009】そして、クラッチ軸14はジョイント28
を介して前輪に回転動力を伝達するドライブシャフト3
0に接続されている。後輪デフ装置6の軸32(L,
R)には、左右後輪のホィールギヤ33(L,R)に噛
合するホィールピニオン35(L,R)と、ブレーキ装
置37(L,R)のブレーキ板38(L,R)が取り付
けられている。ブレーキシュー39(L,R)は切替弁
40と圧力制御弁41の制御で作動するブレーキシリン
ダ42(L,R)によって各々個別に駆動させることが
でき、必要に応じて任意の側の後輪にブレーキをかける
ことができる。
The clutch shaft 14 is connected to a joint 28
Drive shaft 3 that transmits rotational power to the front wheels via the
Connected to 0. The shaft 32 (L,
R), a wheel pinion 35 (L, R) meshing with wheel gears 33 (L, R) of the left and right rear wheels, and a brake plate 38 (L, R) of a brake device 37 (L, R) are attached. I have. The brake shoes 39 (L, R) can be individually driven by brake cylinders 42 (L, R) operated under the control of the switching valve 40 and the pressure control valve 41, and the rear wheels on any side can be used as necessary. You can put a brake on

【0010】このトラクター1は上記走行装置のステア
リングを制御するステアリング制御装置44が設けられ
ている。このステアリング制御装置44は図3に示すよ
うに構成されており、ステアリングシャフト45に接続
する中間シャフト46の下部に設けられたステアリング
センサ47で前輪の操向角、すなわち、ステアリング切
れ角を検出し、これをコントローラ50で処理し、切替
弁40及び圧力制御弁41に出力信号が出される。
The tractor 1 is provided with a steering control device 44 for controlling the steering of the traveling device. The steering control device 44 is configured as shown in FIG. 3, and detects a steering angle of the front wheels, that is, a steering angle by a steering sensor 47 provided below the intermediate shaft 46 connected to the steering shaft 45. This is processed by the controller 50, and an output signal is output to the switching valve 40 and the pressure control valve 41.

【0011】図4を具体的に説明すると、A,Bはそれ
ぞれ弱旋回時と急旋回時の回転中心、C,Dはそれぞれ
後車軸と前車軸の中心点であり、角度θ1,θ2,θ3
は制御の基準となる設定角である。ステアリングセンサ
47で検出される検出ステアリング操向角がθ1の範囲
内であるときは前輪クラッチ10が中立に保持され、後
輪のみを駆動して走行が行なわれる。検出ステアリング
角がθ1からθ2の範囲内にあるときは低速にクラッチ
10が入る。このときの前輪と後輪の回転比はR1:R
2で、後輪に対して前輪が若干高速で回転するようにな
っている。
Referring to FIG. 4 in detail, A and B are the rotation centers at the time of a weak turn and a sharp turn, respectively, C and D are the center points of the rear axle and the front axle, respectively, and the angles θ1, θ2, θ3.
Is a set angle serving as a control reference. When the detected steering angle detected by the steering sensor 47 is within the range of θ1, the front wheel clutch 10 is kept neutral, and the vehicle travels by driving only the rear wheels. When the detected steering angle is in the range from θ1 to θ2, the clutch 10 is engaged at a low speed. At this time, the rotation ratio of the front and rear wheels is R1: R
2, the front wheels rotate slightly faster than the rear wheels.

【0012】検出ステアリング角がθ2からθ3の範囲
になると、前輪クラッチ10が高速に切り替えられる。
このときの、前輪と後輪の回転比はR3:R4で後輪に
対して前輪がかなり速く回転するため、急旋回を行なっ
ても後輪がスリップすることがなく、安定した走行を行
なうことができる。また、θ3は最小旋回半径での旋回
時におけるステアリング角で、検出ステアリング角がこ
れに近づくと旋回内側のブレーキ装置が作動して、その
側のブレーキをかけて急旋回を助けるようになってい
る。なお、この場合は前輪クラッチ10が高速側に切り
替えられているために前輪が後輪に対してブレーキとな
ることがなく、迅速に旋回できる。
When the detected steering angle is in the range from θ2 to θ3, the front wheel clutch 10 is switched at high speed.
At this time, the rotation ratio of the front wheel and the rear wheel is R3: R4, and the front wheel rotates considerably faster than the rear wheel. Therefore, even if the vehicle turns sharply, the rear wheel does not slip and the vehicle runs stably. Can be. Θ3 is the steering angle when turning with the minimum turning radius. When the detected steering angle approaches this, the brake device inside the turn is activated to apply a brake on that side to assist a sharp turn. . In this case, since the front wheel clutch 10 is switched to the high speed side, the front wheel does not act as a brake for the rear wheel, and the vehicle can turn quickly.

【0013】[0013]

【発明の効果】この発明は前記の如く、前輪の操向角を
検出する操向角検出装置と、前輪の駆動状態を高低速に
切り換える高低速切換装置と、左右の後輪のうち任意の
側を独立的に制動することができる左右一対のブレーキ
装置とを有するトラクターにおいて、前輪の操向角が所
定角度以上に操作されたことを操向角検出装置が検出す
ると、前記高低速切換装置を低速側から高速側に切り換
え、かつ旋回内側の後輪ブレーキ装置を制動する制御手
段を設けたものであるから、旋回時には、高低速切換装
置が自動的に高速側に切り換えられ、旋回内側の後輪を
制動するブレーキ装置も自動的に作動することになり、
従来装置に比べて旋回操作が簡単且つ楽になる。
As described above, the present invention provides a steering angle detecting device for detecting a steering angle of a front wheel, a high / low speed switching device for switching a driving state of a front wheel between high and low speeds, and an arbitrary one of left and right rear wheels. In a tractor having a pair of left and right brake devices capable of independently braking the sides, when the steering angle detection device detects that the steering angle of the front wheels has been operated to a predetermined angle or more, the high / low speed switching device Is switched from the low-speed side to the high-speed side, and control means is provided for braking the rear wheel brake device on the inside of the turn. The braking device that brakes the rear wheels will also operate automatically,
The turning operation is easier and easier than in the conventional device.

【0014】特に、左右の後輪ブレーキ装置は、いずれ
か任意の側を独立的に制動することができる構成とし、
操向角検出装置の前輪操向角が所定角度以上に操作され
ればこれに伴って旋回内側の後輪を制動すべく制御する
構成であるから、誤って任意ブレーキ操作をしてもこれ
を実行しないものとなって、任意ブレーキと旋回自動ブ
レーキとを兼用しながらコスト低減をはかりつつ、操作
ミスを引き起こさない。
In particular, the left and right rear wheel brake devices are configured to be able to independently brake any arbitrary side,
If the front wheel steering angle of the steering angle detection device is operated at a predetermined angle or more, the control is performed to brake the rear wheel inside the turning accompanying this. The operation is not executed, so that an operation error is not caused while reducing the cost while using both the arbitrary brake and the turning automatic brake.

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

【図1】トラクターの側面図である。FIG. 1 is a side view of a tractor.

【図2】要部の説明図である。FIG. 2 is an explanatory diagram of a main part.

【図3】ステアリング制御装置のブロック図である。FIG. 3 is a block diagram of a steering control device.

【図4】ステアリング制御の説明図である。FIG. 4 is an explanatory diagram of steering control.

【符号の説明】[Explanation of symbols]

1 トラクター 2 エンジン 3 ミッションケース 10 前輪クラッチ 37 ブレーキ装置 44 ステアリング制御装置 47 ステアリングセンサ 50 制御手段(コントローラ) DESCRIPTION OF SYMBOLS 1 Tractor 2 Engine 3 Transmission case 10 Front wheel clutch 37 Braking device 44 Steering control device 47 Steering sensor 50 Control means (controller)

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 前輪の操向角を検出する操向角検出装置
と、前輪の駆動状態を高低速に切り換える高低速切換装
置と、左右の後輪のうち任意の側を独立的に制動するこ
とができる左右一対のブレーキ装置とを有するトラクタ
ーにおいて、前輪の操向角が所定角度以上に操作された
ことを操向角検出装置が検出すると、前記高低速切換装
置を低速側から高速側に切り換え、かつ旋回内側の後輪
ブレーキ装置を制動する制御手段を設けたことを特徴と
するトラクターの旋回制御装置。
1. A steering angle detecting device for detecting a steering angle of a front wheel, a high / low speed switching device for switching a driving state of a front wheel between a high speed and a low speed, and independently braking any of the left and right rear wheels. In a tractor having a pair of left and right brake devices, when the steering angle detection device detects that the steering angle of the front wheels has been operated to a predetermined angle or more, the high / low speed switching device is shifted from the low speed side to the high speed side. A turning control device for a tractor, wherein control means for switching and braking a rear wheel brake device inside the turning is provided.
JP2000000978A 2000-01-01 2000-01-06 Turning control device for tractor Pending JP2000198462A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000000978A JP2000198462A (en) 2000-01-01 2000-01-06 Turning control device for tractor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000000978A JP2000198462A (en) 2000-01-01 2000-01-06 Turning control device for tractor

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP19590198A Division JP3242367B2 (en) 1987-08-14 1998-07-10 Tractor turning control

Publications (1)

Publication Number Publication Date
JP2000198462A true JP2000198462A (en) 2000-07-18

Family

ID=18530245

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000000978A Pending JP2000198462A (en) 2000-01-01 2000-01-06 Turning control device for tractor

Country Status (1)

Country Link
JP (1) JP2000198462A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2448583A (en) * 2007-04-17 2008-10-22 Jcb Landpower Ltd Use of brakes to aid vehicle steering below a threshold speed
WO2011029864A1 (en) 2009-09-11 2011-03-17 Cnh Italia Spa A vehicle with brake steering

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2448583A (en) * 2007-04-17 2008-10-22 Jcb Landpower Ltd Use of brakes to aid vehicle steering below a threshold speed
GB2448498A (en) * 2007-04-17 2008-10-22 Jcb Landpower Ltd Use of brakes to aid vehicle steering below a threshold speed
GB2448583B (en) * 2007-04-17 2012-01-04 Jcb Landpower Ltd Method of operating a vehicle
WO2011029864A1 (en) 2009-09-11 2011-03-17 Cnh Italia Spa A vehicle with brake steering

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