JPH0422738B2 - - Google Patents
Info
- Publication number
- JPH0422738B2 JPH0422738B2 JP23664386A JP23664386A JPH0422738B2 JP H0422738 B2 JPH0422738 B2 JP H0422738B2 JP 23664386 A JP23664386 A JP 23664386A JP 23664386 A JP23664386 A JP 23664386A JP H0422738 B2 JPH0422738 B2 JP H0422738B2
- Authority
- JP
- Japan
- Prior art keywords
- transmission
- front wheel
- wheels
- pair
- case
- 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
Links
- 230000005540 biological transmission Effects 0.000 claims description 92
- 230000000694 effects Effects 0.000 description 4
- 238000005452 bending Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Landscapes
- Motor Power Transmission Devices (AREA)
- Arrangement And Driving Of Transmission Devices (AREA)
- Retarders (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、走行用トランスミツシヨンを機体後
部に配置し、左右一対の前車輪が走行自在に取付
けられた前輪用伝動ケースを入力軸が前記走行用
トランスミツシヨンの前輪用出力軸より低いレベ
ルに位置する状態で設け、一対の前記前車輪の平
均周速度と左右一対の後車輪の平均周速度とを同
一またはほぼ同一にする標準伝動状態と、一対の
前記前車輪の平均周速度を一対の前記後車輪の平
均周速度より大にする増速伝動状態とに切換え自
在な前輪変速装置を設けた農用トラクターの走行
用伝動構造に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention has a driving transmission disposed at the rear of the fuselage, and a front wheel transmission case to which a pair of left and right front wheels are mounted so as to be freely movable. A standard transmission that is located at a lower level than the front wheel output shaft of the driving transmission and makes the average circumferential speed of the pair of front wheels and the average circumferential speed of the pair of left and right rear wheels the same or almost the same. The present invention relates to a driving transmission structure for an agricultural tractor, which is provided with a front wheel transmission that can freely switch between the above-mentioned state and an increased speed transmission state in which the average circumferential speed of the pair of front wheels is higher than the average circumferential speed of the pair of rear wheels.
上記農用トラクターは、前車輪の操向操作に併
わせ、前輪変速装置を増速伝動状態に切換えて前
輪を増速駆動することにより、前輪が機体を引張
り旋回させるために、前輪周速を後輪周速と同一
にしておくよりも小半径で旋回できるように配慮
されたものである。
The agricultural tractor mentioned above changes the front wheel circumferential speed to the rear so that the front wheels pull the machine body and turn. It was designed to enable turning with a smaller radius than keeping the circumferential speed the same.
この種農用トラクターにおいて、従来、例えば
実開昭59−66627号公報に示されるように、前輪
変速装置を機体後部に位置する走行用トランスミ
ツシヨンに付設されていた。 Conventionally, in this type of agricultural tractor, a front wheel transmission has been attached to a traveling transmission located at the rear of the machine body, as shown in, for example, Japanese Utility Model Application Publication No. 59-66627.
農用トラクターにあつてはロータリ耕耘装置等
の各種作業装置を機体後部に連結することが多
く、またこの作用装置連結時には、機体後部に掛
かる作業装置重量のために前輪に掛かる荷重が作
業装置非連結時よりも減少して前輪の増速駆動時
における小廻り旋回作用が低下することを防止し
たり抑制するように、機体前部にバランスウエイ
トを取付けることがある。このようにバランスウ
エイト装着をするに当り、従来の場合、前輪変速
装置の重量が前輪側よりも後輪側により多く掛か
ることから、装着ウエイトの重量を大にせねばな
らなかつた。
In the case of agricultural tractors, various working devices such as rotary tillers are often connected to the rear of the machine, and when this working device is connected, the weight of the working device on the rear of the machine causes the load on the front wheels to be reduced when the working device is not connected. A balance weight may be attached to the front of the aircraft body in order to prevent or suppress a reduction in the turning effect when the front wheels are driven at increased speed. When installing balance weights in this way, in the conventional case, the weight of the front wheel transmission is more on the rear wheels than on the front wheels, so the weight of the installed weights had to be increased.
本発明の目的は、バランスウエイト装着が必要
な場合でも、増速前輪の小廻り作用を十分に発揮
させることが装着ウエイトを極力軽量なものにし
ながらできるようにし、しかも、走行用トランス
ミツシヨンから前輪用伝動ケースへの伝動がスム
ーズにできるようにすることにある。 An object of the present invention is to make it possible to fully utilize the small turning action of the speed-increasing front wheels even when it is necessary to install balance weights while keeping the weights as light as possible, and to make it possible to reduce the weight from the driving transmission. The purpose is to enable smooth transmission of power to the front wheel transmission case.
本発明の特徴構成は、冒記した農用トラクター
の走行用伝動構造において、前記前輪変速装置を
前記入力軸より伝動下手側に位置させて前記前輪
用伝動ケースに内装してあることにあり、その作
用及び効果は次のとおりである。
A characteristic configuration of the present invention resides in that, in the aforementioned transmission structure for running an agricultural tractor, the front wheel transmission is located on the lower side of the transmission from the input shaft and is internally housed in the front wheel transmission case. The action and effect are as follows.
走行用トランスミツシヨンから前輪用伝動ケー
スに伝動するための回転軸は、トランスミツシヨ
ン入力軸と伝動ケース入力軸とのレベル差に起因
してトランスミツシヨン入力軸及び前輪側入力軸
の夫々に対して傾斜することになる。従つて、前
輪変速装置を前輪用伝動ケースにこれの入力軸よ
り伝動下手側に位置させて内装すると、前記入力
軸より伝動上手側に位置させて前輪用伝動ケース
に付設して前輪変速装置の入力軸が伝動ケース軸
より後方や上方に位置する構成を採用するに比し
て前記回転軸の前記傾斜を緩るく抑えながら、前
輪変速装置をこれの重量が前輪側に従来より多く
掛かるようにしながら備えさせられる。
Due to the level difference between the transmission input shaft and the transmission case input shaft, the rotation shaft for transmitting power from the driving transmission to the front wheel transmission case is connected to the transmission input shaft and the front wheel input shaft, respectively. It will be tilted against. Therefore, if the front wheel transmission is installed inside the front wheel transmission case and located on the lower side of the transmission than the input shaft, the front wheel transmission is installed inside the front wheel transmission case and positioned on the upper side of the transmission from the input shaft. Compared to adopting a configuration in which the input shaft is located behind or above the transmission case shaft, the inclination of the rotating shaft can be suppressed gently, while the front wheel transmission can be moved so that more weight is applied to the front wheels than before. You will be prepared while doing so.
増速状態の前車輪が機体旋回作用を十分に発揮
するように前輪接地圧を十分なものに確保するに
当り、前部バランスウエイトを装着する必要が生
じたとしても、前輪変速装置の重量が前輪側に従
来より多く掛かつていることから、バランスウエ
イトを従来より軽量なもので済ませられるように
なり、作業装置の連結や分離に伴つて必要になる
バランスウエイトの着脱が楽にできるようにでき
た。
Even if it becomes necessary to install front balance weights in order to ensure sufficient front wheel ground pressure so that the front wheels can sufficiently exhibit the aircraft turning action when the speed is increased, the weight of the front wheel transmission is Since more weight is attached to the front wheel than before, it is now possible to use a lighter balance weight than before, making it easier to attach and detach the balance weight that is required when connecting and separating work equipment. .
その上、走行用トランスミツシヨン９から前輪
用伝動ケースに伝動するための回転軸のトランス
ミツシヨン出力軸や伝動ケース入力軸に対する傾
斜を比較的緩傾斜に済ませ得ることから、走行用
トランスミツシヨンから前輪用伝動ケースへの伝
動が回転軸の前記傾斜に起因する腰折れにかかわ
らず騒音が、発生しないようにしながらあるいは
少ないようにしながらスムーズにできるようにな
り、作業が快適にできるようになつた。 Furthermore, since the rotating shaft for transmitting power from the driving transmission 9 to the front wheel transmission case can be tilted relatively gently with respect to the transmission output shaft and the transmission case input shaft, the driving transmission Transmission from the front wheel to the front wheel transmission case can now be carried out smoothly while eliminating or reducing noise, regardless of the bending caused by the inclination of the rotating shaft, making work more comfortable. .
第１図に示すように、左右一対の前車輪１ａ，
１ｂを操向操作及び駆動可能に有し、かつ、左右
一対の非操向型の後車輪２ａ，２ｂを駆動可能に
有した走行機体の後部に、ロータリ耕耘装置等の
各種作業装置を昇降操作可能に連結するリフトア
ーム３、及び、連結作業装置に伝動する動力取出
し軸４を付設して、農用トラクターを構成してあ
る。
As shown in FIG. 1, a pair of left and right front wheels 1a,
1b so that it can be steered and driven, and a pair of left and right non-steering type rear wheels 2a, 2b that can be driven, and various working devices such as a rotary tiller can be raised and lowered at the rear of the traveling body. An agricultural tractor is constructed by attaching a lift arm 3 that can be connected, and a power take-off shaft 4 that transmits power to a connecting work device.
一対の前記前車輪１ａ，１ｂは、これら前車輪
１ａ，１ｂが両端側に各別に取付けられた前輪用
伝動ケース５を介して機体フレーム６に取付けて
ある。そして、前記前輪用伝動ケース５は左右中
間箇所に配置した機体前後方向軸芯P1の周りで
揺動するように機体フレーム６に連結してあり、
走行地盤の凹凸にかかわらず、一対の前車輪１
ａ，１ｂが前輪用伝動ケース５の対機体揺動のた
めに機体に対して反背昇降し、機体を前後方向視
で水平またはこれに近い姿勢に維持するように構
成してある。前記前輪用伝動ケース５は第２図に
示すように、機体側ケース部分５ａと、この機体
側ケース部分５ａの両端部に各別に機体上下方向
軸芯P2の周りで揺動するように連結した一対の
車輪側ケース部分５ｂ，５ｂとから構成してあ
り、車輪側ケース部分５ｂがナツクルアーム７に
より前記軸芯P2の周りで揺動操作されて前車輪
１ａ，１ｂが操向操作されるように構成してあ
る。 The pair of front wheels 1a, 1b are attached to the body frame 6 via a front wheel transmission case 5, which is attached to both ends of the front wheels 1a, 1b separately. The front wheel transmission case 5 is connected to the fuselage frame 6 so as to swing around an axis P1 in the longitudinal direction of the fuselage, which is located at an intermediate position between the left and right sides.
Regardless of the unevenness of the running ground, a pair of front wheels 1
a and 1b are configured to move up and down against the body in order to swing the front wheel transmission case 5 relative to the body, and to maintain the body in a horizontal position or a posture close to this when viewed from the front and rear directions. As shown in FIG. 2, the front wheel transmission case 5 is connected to a fuselage-side case portion 5a and both ends of the fuselage-side case portion 5a separately so as to swing around an axis P2 in the vertical direction of the fuselage. The wheel side case portion 5b is swung around the axis P2 by the knuckle arm 7, and the front wheels 1a and 1b are steered. It is structured as follows.
前車輪１ａ，１ｂ及び後車輪２ａ，２ｂの駆動
を可能にするに、機体後部を形成してあるミツシ
ヨンケース８に走行用トランスミツシヨンケース
９を内装すると共に、エンジン１０の出力をクラ
ツチ１１及び回転軸１２を介して前記走行用トラ
ンスミツシヨン９に伝達するように構成し、そし
て、走行用トランスミツシヨン９の回転出力を前
記ミツシヨンケース８に内装の後輪用差動機構１
３に伝達するように構成し、走行用トランスミツ
シヨン９に前記ミツシヨンケース８から前向きに
突出する状態で備えてある前輪用出力軸１４を回
転軸１５を介して、前記前輪用伝動ケース５に後
向きに突出する状態で、かつ、前記前輪用出力軸
１４より低レベルに位置する状態で備えてある入
力軸１６に連動連結すると共に、この入力軸１６
の回動力を、第２図に示す如く前記前輪用伝動ケ
ース５に内装してある減速ベベルギア１７及び前
輪変速装置１８を介して前輪用差動機構１９に伝
達するように構成してある。 In order to drive the front wheels 1a, 1b and the rear wheels 2a, 2b, a transmission case 9 for driving is installed inside the transmission case 8 forming the rear part of the fuselage, and the output of the engine 10 is connected to the clutch 11. The rotational output of the driving transmission 9 is transmitted to the driving transmission 9 via the rotating shaft 12, and the rotational output of the driving transmission 9 is transmitted to the transmission case 8 through the internal rear wheel differential mechanism 1.
A front wheel output shaft 14, which is configured to transmit power to the front wheel transmission case 5 and which is provided in the driving transmission 9 in a state protruding forward from the transmission case 8, is connected to the front wheel transmission case 5 via a rotating shaft 15. The input shaft 16 is interlocked and connected to an input shaft 16 that protrudes rearward and is located at a lower level than the output shaft 14 for the front wheels.
The rotating force is transmitted to a front wheel differential mechanism 19 via a reduction bevel gear 17 and a front wheel transmission 18, which are housed in the front wheel transmission case 5, as shown in FIG.
前記前輪変速装置１８は第２図に示すように構
成してある。 The front wheel transmission 18 is constructed as shown in FIG.
すなわち、前記減速ベベルギア１７に連動させ
た入力筒軸２０に標準伝動ギア２１を一体回転可
能に取付け、この標準伝動ギアー２１に第１ギア
２２、ギア支軸２３及び第２ギア２４を介して増
速連動させた増速伝動ギア２５を、前記前輪用差
動機構１９のデフアシヤルギアケース１９ａに連
設してある出力筒軸２６に相対回転可能に取付
け、そして、出力筒軸２６に筒体２７ａを介して
一体回転するように、かつ、摺動するように取付
けた伝動部材２７と前記標準伝動ギア２１の間に
咬合いクラツチ２８を設けると共に、出力筒軸２
６と前記増速伝動ギア２５の間に多板式摩擦クラ
ツチ２９を設けてある。そして、前記伝動部材２
７が揺動シフター３０を介して連動させてある第
４図に示す如きプツシユロツド型の操作部３１に
より摺動操作されるに伴い前記クラツチ２８及び
２９が入り切りするように構成すると共に、前記
咬合いクラツチ２８が入りで前記摩擦クラツチ２
９が切りになるように伝動部材２７及び操作部３
１をスプリング３２によつて付勢してある。 That is, a standard transmission gear 21 is integrally and rotatably attached to the input cylinder shaft 20 which is interlocked with the reduction bevel gear 17, and the standard transmission gear 21 is connected to a first gear 22, a gear support shaft 23, and a second gear 24. The speed-linked speed increasing transmission gear 25 is relatively rotatably attached to the output cylinder shaft 26 connected to the differential gear case 19a of the front wheel differential mechanism 19, and the cylinder body is attached to the output cylinder shaft 26. An engagement clutch 28 is provided between the standard transmission gear 21 and the transmission member 27 which is attached so as to integrally rotate and slide through the output cylinder shaft 27a.
A multi-plate friction clutch 29 is provided between the speed increasing transmission gear 25 and the speed increasing transmission gear 25. Then, the transmission member 2
The clutches 28 and 29 are configured to be engaged and closed as the clutches 28 and 29 are slidably operated by a push-rod type operating section 31 as shown in FIG. When the clutch 28 is engaged, the friction clutch 2
Transmission member 27 and operation part 3 so that 9 is turned off
1 is biased by a spring 32.
さらに詳述すると、操作部３１が機体側ケース
部分５ａからの突出長さが長くなる第１操作位置
Ｓに操作されると、摩擦クラツチ２９が切りで咬
合いクラツチ２８が入りになつて標準伝動ギア２
１の回動力が伝動部材２７を介して出力筒軸２６
に伝達され、左右前輪１ａ，１ｂの平均周速度と
左右後輪２ａ，２ｂの平均周速度とが同一または
ほぼ同一になるように前輪用差動機構１３に伝動
する標準伝動状態になり、そして、操作部３１が
機体側ケース部分５ａからの突出長さが短くなる
第２操作位置Ｈに操作されると、咬合いクラツチ
２８が切りで、摩擦クラツチ２９が入りになつて
増速伝動ギア２５の回動力が出力筒軸２６に伝達
され、左右前輪１ａ，１ｂの平均周速度が左右後
輪２ａ，２ｂの平均周速度より大になるように前
輪用差動機構１９に伝動する増速伝動状態になる
ようにしてある。そして、前記入力軸１６より伝
動下手側に位置するように、かつ、前記標準伝動
状態に復元付勢されているようにしてある。 More specifically, when the operating portion 31 is operated to the first operating position S where the protruding length from the fuselage side case portion 5a becomes longer, the friction clutch 29 is disengaged and the engagement clutch 28 is engaged, thereby causing the standard transmission. gear 2
The rotational force of 1 is transmitted to the output cylinder shaft 26 via the transmission member 27.
and enters a standard transmission state in which the transmission is transmitted to the front wheel differential mechanism 13 so that the average circumferential speed of the left and right front wheels 1a, 1b and the average circumferential speed of the left and right rear wheels 2a, 2b are the same or almost the same, and , when the operating portion 31 is operated to the second operating position H where the length of protrusion from the fuselage side case portion 5a is shortened, the bite clutch 28 is disengaged, the friction clutch 29 is engaged, and the speed increasing transmission gear 25 is engaged. is transmitted to the output cylinder shaft 26, and is transmitted to the front wheel differential mechanism 19 so that the average circumferential speed of the left and right front wheels 1a, 1b is greater than the average circumferential speed of the left and right rear wheels 2a, 2b. It is made to be in a state. It is located on the lower side of transmission than the input shaft 16 and is biased to return to the standard transmission state.
第３図に示すように、前記操作部３１の操作の
ための回転カム３３を一方の前記車輪側ケース部
分５ｂに備えてある。そして、前記回転カム３３
は、機体側ケース部分５ａに対して車輪側ケース
部分５ｂと一体に前記軸芯P2の周りで回動し、
直進用位置から左向き側及び右向き側への操向角
が設定値未満にあるところの操向状態に前車輪１
ａ，１ｂがある時には、第１周面カム部３３ａが
操作部３１に対向してこれを前記第１操作位置Ｓ
に維持操作するように、かつ、左向き側及び右側
への操向角が前記設定値以上になる操向状態に前
車輪１ａ及び１ｂが操向操作された時には、第２
カム部３３ｂまたは第３周面カム部３３ｃをして
操作部３１を前記第２操作位置Ｈに押圧操作する
ように構成してある。つまり、前車輪１ａ，１ｂ
が設定角未満の操向状態にあると前輪変速装置１
８が標準伝動状態にあり、前車輪１ａ，１ｂを設
定角以上の操向操作することにより前輪変速装置
１８を増速伝動状態に切換え操作できるようにし
てある。 As shown in FIG. 3, a rotary cam 33 for operating the operating portion 31 is provided on one of the wheel side case portions 5b. Then, the rotating cam 33
rotates around the axis P2 integrally with the wheel side case part 5b with respect to the body side case part 5a,
The front wheel 1 is in a steering state where the steering angle from the straight-ahead position to the leftward side and rightward side is less than the set value.
a, 1b, the first circumferential cam portion 33a faces the operating portion 31 and moves it to the first operating position S.
When the front wheels 1a and 1b are steered to a state where the leftward and rightward steering angles are equal to or greater than the set values, the second
The cam portion 33b or the third circumferential cam portion 33c is configured to press the operating portion 31 to the second operating position H. In other words, the front wheels 1a, 1b
When the steering angle is less than the set angle, the front wheel transmission 1
8 is in a standard transmission state, and by steering the front wheels 1a, 1b by a set angle or more, the front wheel transmission 18 can be switched to an increased speed transmission state.
尚、本発明は特許請求の範囲の項に図面との対
照を便利にするために符号を記すが、該記入によ
り本発明は添付図面の構造に限定されるものでは
ない。 Incidentally, in the present invention, reference numerals are written in the claims for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by such markings.
図面は本発明に係る農用トラクターの走行用伝
動構造の実施例を示し、第１図は農用トラクタ全
体の一部切欠き側面図、第２図は前輪用伝動ケー
スの一部展開の断面図、第３図は前輪変速装置操
作部の一部切欠き平面図、第４図は前輪変速装置
操作部の一部切欠き後面図である。
１ａ，１ｂ……前車軸、２ａ，２ｂ……後車
輪、５……前輪用伝動ケース、９……走行用トラ
ンスミツシヨン、１４……前輪用出力軸、１６…
…入力軸、１８……前輪変速装置。
The drawings show an embodiment of the driving transmission structure for an agricultural tractor according to the present invention, in which Fig. 1 is a partially cutaway side view of the entire agricultural tractor, Fig. 2 is a partially developed sectional view of the front wheel transmission case, FIG. 3 is a partially cutaway plan view of the front wheel transmission operating section, and FIG. 4 is a partially cutaway rear view of the front wheel transmission operating section. 1a, 1b...front axle, 2a, 2b...rear wheel, 5...front wheel transmission case, 9...driving transmission, 14...front wheel output shaft, 16...
...Input shaft, 18...Front wheel transmission.
Claims (1)
置し、左右一対の前車輪１ａ，１ｂが走行自在に
取付けられた前輪用伝動ケース６を入力軸１６が
前記走行用トランスミツシヨン９の前輪用出力軸
１４より低いレベルに位置する状態で設け、一対
の前記前車輪１ａ，１ｂの平均周速度と左右一対
の後車輪２ａ，２ｂの平均周速度とを同一または
ほぼ同一にする標準伝動状態と、一対の前記前車
輪１ａ，１ｂの平均周速度を一対の前記後車輪２
ａ，２ｂの平均周速度より大にする増速伝動状態
とに切換え自在な前輪変速装置１８を設けた農用
トラクターの走行用伝動構造であつて、前記前輪
変速装置１８を前記入力軸１６より伝動下手側に
位置させて前記前輪用伝動ケース５に内装してあ
る農用トラクターの走行用伝動構造。1 A driving transmission 9 is arranged at the rear of the aircraft body, and a front wheel transmission case 6 to which a pair of left and right front wheels 1a and 1b are mounted so as to be freely travelable is connected to an input shaft 16 that connects to the front wheel output of the driving transmission 9. a standard transmission state in which the average circumferential speed of the pair of front wheels 1a, 1b is the same or almost the same as the average circumferential speed of the pair of left and right rear wheels 2a, 2b; The average circumferential speed of the pair of front wheels 1a, 1b is determined by the average circumferential speed of the pair of rear wheels 2
A driving transmission structure for an agricultural tractor, which is equipped with a front wheel transmission 18 that can be switched to an increased speed transmission state in which the speed is higher than the average circumferential speed of the wheels a and 2b, wherein the front wheel transmission 18 is transmitted through the input shaft 16. A driving transmission structure for an agricultural tractor located on the lower side and installed inside the front wheel transmission case 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23664386A JPS6390437A (en) | 1986-10-03 | 1986-10-03 | Running transmission structure for farm tractor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23664386A JPS6390437A (en) | 1986-10-03 | 1986-10-03 | Running transmission structure for farm tractor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6390437A JPS6390437A (en) | 1988-04-21 |
| JPH0422738B2 true JPH0422738B2 (en) | 1992-04-20 |
Family
ID=17003661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23664386A Granted JPS6390437A (en) | 1986-10-03 | 1986-10-03 | Running transmission structure for farm tractor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6390437A (en) |
-
1986
- 1986-10-03 JP JP23664386A patent/JPS6390437A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6390437A (en) | 1988-04-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |