JPS6234821A - Four wheel drive type tractor - Google Patents
Four wheel drive type tractorInfo
- Publication number
- JPS6234821A JPS6234821A JP17350785A JP17350785A JPS6234821A JP S6234821 A JPS6234821 A JP S6234821A JP 17350785 A JP17350785 A JP 17350785A JP 17350785 A JP17350785 A JP 17350785A JP S6234821 A JPS6234821 A JP S6234821A
- Authority
- JP
- Japan
- Prior art keywords
- wheel drive
- average
- wheel
- hydraulic
- circumferential speed
- 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
Landscapes
- Arrangement And Driving Of Transmission Devices (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、中立復帰型の電磁式三位置切換弁によって油
圧式切換装置を操作して、左右前輪の平均前輪周速度と
左右後輪の平均後輪周速度とがほぼ同一になる状態で駆
動される標準４輪駆動状態と、平均前輪周速度が平均後
輪周速度よりも大となる旋回用４輪駆動状態と、後輪の
みによって駆動される２輪駆動状態とに切換える４輪駆
動型のトラクタに関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention operates a hydraulic switching device using a neutral return type electromagnetic three-position switching valve to determine the average front wheel circumferential speed of the left and right front wheels and the average front wheel circumferential speed of the left and right rear wheels. A standard 4-wheel drive state in which the average rear wheel circumferential speed is almost the same, a turning 4-wheel drive state in which the average front wheel circumferential speed is higher than the average rear wheel circumferential speed, and a four-wheel drive state in which the average front wheel circumferential speed is higher than the average rear wheel circumferential speed. The present invention relates to a four-wheel drive tractor that can be switched to a two-wheel drive state.
冒記した４輪駆動型のトラクタにおいては、エンジンか
らの出力を平均周速度が後輪の平均周速度とほぼ同じに
なるように前輪に伝達する油圧式切換装置と、平均周速
度が後輪の平均周速度よりも大となるように前輪に伝達
する油圧式切換装置とを夫々設け、これらの両袖圧式切
換装置を中立位置でポンプからの圧油をタンクに戻す型
式の一般的な中立復帰型の電磁式三位置切換弁によって
操作して、標準４輪駆動状態と旋回用４輪駆動状態と２
輪駆動状態とに切換えるように構成していた。The four-wheel drive tractor mentioned above has a hydraulic switching device that transmits the output from the engine to the front wheels so that the average peripheral speed is almost the same as the average peripheral speed of the rear wheels, and a hydraulic switching device that transmits the output from the engine to the front wheels so that the average peripheral speed is almost the same as the average peripheral speed of the rear wheels. Hydraulic switching devices are installed to transmit pressure to the front wheels so that the speed is higher than the average circumferential speed of Operated by a return type electromagnetic three-position switching valve, the standard four-wheel drive state, four-wheel drive state for turning, and two
It was configured to switch to wheel drive mode.
標準４輪駆動状態への切換と旋回用４輪駆動状態への切
換えはいずれかの油圧式切換装置を作動状態とし、２輪
駆動状態への切換えはいずれの油圧式切換装置も非作動
状態としなければならないために、上述の従来の技術に
よれば、切換弁が中立位置にあるとき２輪駆動状態に切
換わるように構成せざるを得なった。Switching to the standard 4-wheel drive state and switching to the turning 4-wheel drive state requires one of the hydraulic switching devices to be activated, and switching to the 2-wheel drive state requires both hydraulic switching devices to be inactive. Therefore, according to the above-mentioned conventional technology, it has been necessary to configure the vehicle to switch to the two-wheel drive state when the switching valve is in the neutral position.
従って、標準４輪駆動状態、或いは、旋回用４輪駆動状
態で作業を行う圃場内では、常に電磁式三位直切換弁の
いずれかのソレノイドを励磁するように通電していなけ
ればならず、ソレノイドに対する電気系統に故障が生じ
た場合には標準４輪駆動状態での作業が不可能になるば
かりでなく、通電によるソレノイドコイルの発熱時間が
長く、温度が上昇してソレノイドコイルが早期に劣化す
る原因となっていた。Therefore, when working in the field in standard 4-wheel drive mode or turning 4-wheel drive mode, it is necessary to always energize one of the solenoid of the electromagnetic three-position direct switching valve. If a failure occurs in the electrical system for the solenoid, not only will it be impossible to work in standard 4-wheel drive mode, but the solenoid coil will take a long time to generate heat due to energization, and the temperature will rise, causing early deterioration of the solenoid coil. It was causing this.
本発明は、上記従来技術の有する問題点を、三位直切換
弁の切換位置を工夫することにより解決することを目的
とする。An object of the present invention is to solve the problems of the above-mentioned prior art by devising the switching position of a three-position direct switching valve.
上記目的を達成するための本発明の特徴とする構成は、
官記した４輪駆動型のトラクタに、おいて、前記中立復
帰型の電磁式三位直切換弁の中立位置に、前記標準４輪
駆動状態に切換えるための油路を形成しである点にあり
、かかる構成から次の作用効果を奏する。The characteristic structure of the present invention for achieving the above object is as follows:
In the officially registered four-wheel drive type tractor, an oil passage for switching to the standard four-wheel drive state is formed in the neutral position of the neutral return type electromagnetic three-position direct switching valve. This configuration provides the following effects.
中立復すｉ５型の電磁弐三位置切換弁が中立位置にある
とき、すなわち、いずれのソレノイドも励磁しない状態
のとき、トラクタの全走行時間中に占める割合いが最も
多い標準４輪駆動状態での走行を行うようにしたので、
通電によるソレノイドコイルの発熱時間が短い。When the i5 type electromagnetic two-position switching valve is in the neutral position, that is, when none of the solenoids are energized, it is in the standard four-wheel drive state, which accounts for the largest proportion of the tractor's total traveling time. Since I made it to run,
The heat generation time of the solenoid coil when energized is short.
ソレノイドの早期劣化を抑制して、切換弁としての性能
を長期にわたって維持するとともに電力の消費量を少な
くすることができ、たとえ、ソレノイドを励磁する電気
系統に故障が生じても、標準４輪駆動状態での作業をｇ
！続して行うことができるに至った。It is possible to suppress early deterioration of the solenoid, maintain its performance as a switching valve over a long period of time, and reduce power consumption.Even if a failure occurs in the electrical system that excites the solenoid, standard 4-wheel drive work in the state
! I was able to continue.
第３図に示すように、左右一対の操向型前輪（１） 、
（１）及び非操向型後輪（２） 、 （２）の夫々を
駆動自在に備えさせ、かつ、エンジン（３）、ミッショ
ンケース（４Ａ）、これらを連結する左右一対の機体主
フレーム（５） 、 （５）で機体本体を形成しである
走行機体の後部に、ロータリー耕耘装置等の各種作業装
置を昇降自在に連結するための上下に駆動揺動自在なリ
フトアーム（６）、及び、連結作業装置に伝動するため
の動力取出し軸（７）を設けて、４輪駆動型の農用トラ
クタを構成しである。As shown in Fig. 3, a pair of left and right steering type front wheels (1),
(1) and non-steering type rear wheels (2), (2) are each equipped with a freely drivable engine (3), a transmission case (4A), and a pair of left and right fuselage main frames that connect these ( 5) A lift arm (6) which is movable up and down to connect various working devices such as a rotary tiller to the rear of the traveling machine which forms the main body of the machine in (5) in a vertically movable manner; A four-wheel drive agricultural tractor is constructed by providing a power take-off shaft (7) for transmitting power to a connected working device.
前記ミッションケース（４Ａ）には、前後輪（１）。The transmission case (4A) includes front and rear wheels (1).
（２）に対する変速が可能な主ミツシヨン部を内装する
とともに、前輪（１）に対する増速機構（８）を付設し
である。(2) is equipped with a main transmission part capable of changing speeds, and a speed increasing mechanism (8) for the front wheels (1) is attached.
前記増速機構（８）は、第２図に示すように、主ミツシ
ヨン部から後輪（２）の差動装置（９）に対する出力軸
（１０）に入力ギア（ＩＯＣ）を固定し、この入力ギア
（ＩＯＣ）と、前輪（１）の差動装置（１１）に対する
出力軸（１４）に遊嵌された太陽ギア（１２）とを中間
軸（１３）取付けた遊転ギア（１３Ｇ）に常時咬合させ
るとともに、前記太陽ギア（１２）に連設のギア（１２
Ｇ）と咬合する遊星第１ギア（１８Ｇ、’）と、出力軸
（１４）に固定の出力ギア（１４Ｇ）と咬合する遊星第
２ギア（１８Ｇｇ）とを一体連設した遊星ギア（１８）
・・を遊転自在に保持するキャリア（１５）を、出力軸
（１４）に遊嵌し、このキャリア（１５）と出力軸（１
４）との間には油圧式切換装置としての等速用油圧クラ
ッチ（１６）を介装し、キャリア（１５）と増速装置（
８）のケース（４Ｂ）との間には油圧式切換装置として
の増速用油圧ブレーキ（１７）を介装して構成しである
。As shown in FIG. 2, the speed increasing mechanism (8) has an input gear (IOC) fixed to an output shaft (10) from the main transmission section to the differential device (9) of the rear wheels (2). The input gear (IOC) and the sun gear (12) loosely fitted on the output shaft (14) for the differential device (11) of the front wheels (1) are connected to the free rotation gear (13G) attached to the intermediate shaft (13). A gear (12) connected to the sun gear (12) is always engaged with the sun gear (12).
A planetary gear (18) that is integrally connected with a planetary first gear (18G,') that meshes with G) and a planetary second gear (18Gg) that meshes with an output gear (14G) fixed to the output shaft (14).
A carrier (15) that freely rotatably holds the output shaft (14) is loosely fitted to the output shaft (14), and the carrier (15) and the output shaft (1
A constant velocity hydraulic clutch (16) as a hydraulic switching device is interposed between the carrier (15) and the speed increasing device (4).
8), a speed increasing hydraulic brake (17) as a hydraulic switching device is interposed between the case (4B) and the case (4B).
そして、等速用油圧クラッチ（１６）を入りにして増速
用油圧ブレーキ（１７）を切りにすると、遊星ギア（１
８）・・と出力ギア（１４Ｇ）との相対回転が不能にな
り、出力軸（１４）と太陽ギア（１２）は等速で回転し
て、左右前輪（１） 、 （１）にこれらの平均周速度
が左右後輪（２） 、 （２）の平均周速度より極くわ
ずかだけ大となるように伝動する４輪駆動状態となり、
増速用油圧ブレーキ（１７）を入りにして等速用油圧ク
ラッチ（１６）を切りにすると、太陽ギア（１２）が遊
星ギア（１８）・・を介して出力軸（１４）を駆動し、
左右前輪（１） 、 （１）にこれらの平均周速度が左
右後輪（２） 、 （２）の平均周速度よりも大になる
ように伝動する旋回用４輪駆動状態となり、等速用油圧
クラッチ（１６）と増速用油圧ブレーキ（１７）をいず
れも切りにすると、キャリア（１５）が出力軸（１４）
まわりで遊転して、前輪（１）を駆動しない２輪駆動状
態となるように構成しである。Then, when the constant velocity hydraulic clutch (16) is engaged and the speed increasing hydraulic brake (17) is disengaged, the planetary gear (1
8) Relative rotation between the output gear (14G) and the output gear (14G) becomes impossible, and the output shaft (14) and the sun gear (12) rotate at a constant speed. A four-wheel drive state is established in which power is transmitted so that the average circumferential speed is only slightly higher than the average circumferential speed of the left and right rear wheels (2), (2).
When the speed increasing hydraulic brake (17) is engaged and the constant velocity hydraulic clutch (16) is disengaged, the sun gear (12) drives the output shaft (14) via the planet gear (18)...
A turning four-wheel drive state is established in which power is transmitted to the left and right front wheels (1), (1) so that their average circumferential speed is greater than the average circumferential speed of the left and right rear wheels (2), (2). When both the hydraulic clutch (16) and the speed-increasing hydraulic brake (17) are disengaged, the carrier (15) is connected to the output shaft (14).
It is configured so that it rotates freely around the vehicle and enters a two-wheel drive state in which the front wheels (1) are not driven.
前記油圧クラッチ（１６）と油圧ブレーキ（１７）は、
第１図に示すように、ミッションケース（４Ｂ）に内装
した中立復帰型の電磁式三位直切換弁（２２）を介して
油圧ポンプ（Ｐ）に接続しである。The hydraulic clutch (16) and the hydraulic brake (17) are
As shown in FIG. 1, it is connected to the hydraulic pump (P) via a neutral return type electromagnetic three-position direct switching valve (22) housed in the transmission case (4B).
そして、前記三位直切換弁（２２）の中立位置（２３）
にボート（２４ａ）とボート（２４ｂ）とを連通ずる油
路（２４）と、ポート（２５ａ） とボート（２５ｂ）
とを連通ずる油路（２５）とが形成してあり、三位直
切換弁（２２）が中立状態にあるとき、すなわち、三位
直切換弁（２２）に設けであるソレノイド（２２Ｓｌ）
。and the neutral position (23) of the three-position direct switching valve (22).
An oil passage (24) that connects the boat (24a) and the boat (24b), and a port (25a) and the boat (25b).
When the three-position direct switching valve (22) is in the neutral state, the solenoid (22Sl) provided in the three-position direct switching valve (22) is formed.
.
（２２Ｓ２）のいずれも通電励磁しないとき、等速用油
圧クラッチ（１６）のピストン（１６Ｐ）に対する圧油
室に連通ずる第１油路（１９）がポート（２４ａ）に接
続し、油圧ポンプ（Ｐ）からの油路（２１）がポート（
２４ｂ）に接続し、第１油路（１９）と油路（２１）と
が連通して圧油が圧油室に供給されてクラッチ入り状態
になるとともに、増速用油圧ブレーキ（１７）に対する
圧油室に連通ずる第２油路（２０）がポート（２５ａ）
に接続し、ボート（２５ｂ）からタンク（Ｔ）に圧油が
戻されてブレーキ切り状態になって標準４輪駆動状態で
駆動される。(22S2) is not energized, the first oil passage (19) communicating with the pressure oil chamber for the piston (16P) of the constant velocity hydraulic clutch (16) is connected to the port (24a), and the hydraulic pump ( The oil passage (21) from P) is connected to the port (
24b), the first oil passage (19) and the oil passage (21) communicate with each other, and pressure oil is supplied to the pressure oil chamber to enter the clutch engaged state, and the hydraulic brake for speed increase (17) is connected to the hydraulic brake (17). The second oil passage (20) communicating with the pressure oil chamber is the port (25a)
Pressure oil is returned from the boat (25b) to the tank (T), the brakes are turned off, and the vehicle is driven in standard four-wheel drive mode.
又、ソレノイド（２２ｓ ＋ ） 、 （２２ｓ ２）
択一的に通電励磁するスイッチ（ＳＷ）を設けて、一方
のソレノイド（２２Ｓ、）を励磁すると、等速用油圧ク
ラッチ（１６）が切り状態になるとともに増速用油圧ブ
レーキ（Ｉ７）が入り状態になって旋回用４輪駆動状態
で駆動され、他方のソレノイド（２２３２）を励磁する
と、等速用油圧クラッチ（１６）と増速用油圧ブレーキ
（１７）の双方が共に切り状態になって後輪（２）のみ
による２輪駆動状態で駆動される。Also, solenoid (22s +), (22s 2)
A switch (SW) that selectively energizes is provided, and when one solenoid (22S,) is energized, the constant velocity hydraulic clutch (16) is disengaged and the speed increasing hydraulic brake (I7) is engaged. When the vehicle is driven in four-wheel drive mode for turning and the other solenoid (2232) is energized, both the constant velocity hydraulic clutch (16) and the speed increasing hydraulic brake (17) are in the disengaged state. It is driven in a two-wheel drive state using only the rear wheels (2).
図面は本発明にかかる４輪駆動型のトラクタの実施例を
示し、第１図は油圧系統図、第２図は増速機構の縦断面
図、第３図はトラクタの側面図を示す。
（１）・・・・・・前輪、（２）・・・・・・後輪、（
８）・・・・・・増速機構、（１６） 、 （１７）・
・・・・・油圧式切換装置、（２２）・・・・・・電磁
式三位直切換弁、（２３）・・・・・・中立位置、（２
４） 、 （２５）・・・・・・油路。The drawings show an embodiment of a four-wheel drive type tractor according to the present invention, and FIG. 1 shows a hydraulic system diagram, FIG. 2 shows a longitudinal sectional view of a speed increasing mechanism, and FIG. 3 shows a side view of the tractor. (1)...Front wheel, (2)...Rear wheel, (
8) Speed increasing mechanism, (16), (17)
... Hydraulic switching device, (22) ... Solenoid three-position direct switching valve, (23) ... Neutral position, (2
4) , (25)... Oil road.
Claims (1)
式切換装置（１６）、（１７）を操作して、左右前輪（
１）、（１）の平均前輪周速度と左右後輪（２）、（２
）の平均後輪周速度とがほぼ同一になる状態で駆動され
る標準４輪駆動状態と、平均前輪周速度が平均後輪周速
度よりも大となる旋回用４輪駆動状態と、後輪（２）、
（２）のみによって駆動される２輪駆動状態とに切換え
る４輪駆動型のトラクタにおいて、前記中立復帰型の電
磁式三位置切換弁（２２）の中立位置（２３）に、前記
標準４輪駆動状態に切換えるための油路（２４）、（２
５）を形成してあることを特徴とする４輪駆動型のトラ
クタ。The left and right front wheels (
1), (1) average front wheel circumferential speed and left and right rear wheels (2), (2)
) is driven in a state in which the average rear wheel circumferential speed is almost the same, a turning four-wheel drive state in which the average front wheel circumferential speed is higher than the average rear wheel circumferential speed, and the rear wheel (2),
(2) In a four-wheel drive tractor that switches to a two-wheel drive state driven only by the standard four-wheel drive Oil passages (24), (2) for switching to the state
5) A four-wheel drive tractor characterized by forming:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17350785A JPS6234821A (en) | 1985-08-06 | 1985-08-06 | Four wheel drive type tractor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17350785A JPS6234821A (en) | 1985-08-06 | 1985-08-06 | Four wheel drive type tractor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6234821A true JPS6234821A (en) | 1987-02-14 |
Family
ID=15961807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17350785A Pending JPS6234821A (en) | 1985-08-06 | 1985-08-06 | Four wheel drive type tractor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6234821A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0157927U (en) * | 1987-10-07 | 1989-04-11 |
-
1985
- 1985-08-06 JP JP17350785A patent/JPS6234821A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0157927U (en) * | 1987-10-07 | 1989-04-11 |
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