JP3280961B2 - Agricultural traveling body - Google Patents

Description

【発明の詳細な説明】 （産業上の利用分野） この発明は、苗植機の走行車体のような小型の農用走
行車体に関するものである。Description: TECHNICAL FIELD The present invention relates to a small-sized agricultural traveling vehicle such as a traveling vehicle of a seedling planter.

（従来の技術） 従来、左右の前輪に左右差動可能に動力を分岐する前
輪差動装置を収容する前輪差動装置収容部を車体の前側
に配置して設けるとともに、左右の後輪に左右差動可能
に動力を分岐する後輪差動装置を収容する後輪差動装置
収容部を車体の後側に配置して設け、前輪差動装置収容
部の左右両側部に左右の前輪に伝動する伝動部を収容す
る左右前輪伝動収容部を設けてその左右両端から突出さ
せた前車軸に前輪を取り付け、後輪差動装置収容部の左
右両側部に左右の後輪に伝動する伝動部を収容する左右
前輪伝動収容部を設けてその左右両端から突出させた後
車軸に後輪を取り付けた農用走行車体にあった。なお、
上記農用走行車体において、前輪差動装置収容部と後輪
差動装置収容部とは、従来、前後に分散配置して両者を
フレームで連結する構成とするか、前輪差動装置収容部
と後輪差動装置収容部とを共に車体前部側に配置した一
体の伝動装置収容部に設けた構成としていた。(Prior Art) Conventionally, a front wheel differential device accommodating portion for accommodating a front wheel differential device for branching power to left and right front wheels so as to be able to perform left and right differentials is provided on a front side of a vehicle body, and left and right rear wheels are provided on right and left rear wheels. A rear wheel differential device housing that houses the rear wheel differential device that branches power differentially is provided at the rear side of the vehicle body, and is transmitted to the left and right front wheels on both left and right sides of the front wheel differential device housing The front wheel is mounted on the front axle protruding from the left and right ends of the left and right front wheel transmission housings that house the transmissions to be transmitted, and the transmission that transmits to the left and right rear wheels is mounted on the left and right sides of the rear wheel differential device housing. There was an agricultural traveling vehicle body in which a rear wheel was attached to a rear axle provided with left and right front wheel transmission housing portions for housing and protruding from both left and right ends thereof. In addition,
In the agricultural traveling vehicle body, the front wheel differential device accommodating portion and the rear wheel differential device accommodating portion are conventionally arranged so as to be dispersed in front and rear and connected by a frame, or the front wheel differential device accommodating portion and the rear The configuration is such that the wheel differential device accommodating portion and the wheel differential device accommodating portion are both provided in an integral transmission device accommodating portion disposed on the front side of the vehicle body.

（発明が解決しようとする課題） 上記従来の技術において、前記のように前輪差動装置
収容部と後輪差動装置収容部とをフレームで連結する構
成にすると、後輪差動装置に動力を伝達する伝動部を、
一旦、伝動装置の収容部内から外に取り出す構造を設け
なければならず、そのぶん部品点数も増え、コストアッ
プとなる。また、前輪差動装置収容部と後輪差動装置収
容部とを共に車体前部側に配置した一体の伝動装置収容
部に設けた構成とすると、後輪差動装置収容部の左右か
ら左右後輪へ動力を伝達する左右の伝動部が前後に長く
設けられる構成となり、そのぶん車体重量の重いものと
なる。(Problems to be Solved by the Invention) In the above-described conventional technology, if the front wheel differential device accommodating portion and the rear wheel differential device accommodating portion are connected by a frame as described above, the rear wheel differential device has power. The transmission that transmits the
It is necessary to provide a structure for taking it out of the housing of the transmission once, which increases the number of parts and increases the cost. In addition, if the front wheel differential device accommodating portion and the rear wheel differential device accommodating portion are both provided in an integral transmission device accommodating portion disposed on the front side of the vehicle body, the left and right sides of the rear wheel differential device accommodating portion are provided. The left and right transmission parts for transmitting the power to the rear wheels are long in the front and rear, and the weight of the vehicle is heavier.

そこで、この発明は、後輪差動装置に動力を伝達する
伝動部を伝動装置の収容部内から外に取り出すことによ
る部品点数の増加及びコストアップを回避し、且つ、後
輪差動装置収容部の左右から左右後輪へ動力を伝達する
左右の伝動部が前後に長くなることにより車体重量が重
くなることをできるだけ抑えて、車体重量の軽量化を図
り、また、農作業を行う圃場は凹凸が多いのでできるだ
け安定した走行ができるようにすることを課題とする。Therefore, the present invention avoids an increase in the number of parts and an increase in cost due to taking out a transmission portion for transmitting power to the rear wheel differential device from the inside of the housing portion of the transmission device, and also achieves a rear wheel differential device housing portion. The left and right transmission parts that transmit power from the left and right to the right and left rear wheels are lengthened back and forth, minimizing the weight of the vehicle body as much as possible, reducing the weight of the body weight, and It is an object of the present invention to make the running as stable as possible.

（課題を解決するための手段） この発明は、上記課題を解決するために、左右の前輪
64,64に左右差動可能に動力を分岐する前輪差動装置８
を収容する前輪差動装置収容部Ｆを左右の前輪64,64の
間に配置して設けるとともに、左右の後輪55,55に左右
差動可能に動力を分岐する後輪差動装置44,44を収容す
る後輪差動装置収容部Ｒを左右前輪64,64間の外側後方
に配置して設け、エンジンからの動力を複数段に変速可
能に伝達する変速伝動機構28,21,20,27を収容する変速
伝動機構収容部５を前記前輪差動装置収容部Ｆに連設
し、該前輪差動装置収容部Ｆと後輪差動装置収容部Ｒと
を、前記変速伝動機構を経た動力を後輪差動装置44,44
に伝達する伝動部38を収容して車体の前後方向に延び且
つ左右前輪64,64間の外側後方に向けて後下がり姿勢で
延びる収容部１で一体的に連結した構成として、変速伝
動機構収容部５と前輪差動装置収容部Ｆと後輪差動装置
収容部Ｒと後輪差動装置44,44に伝達する伝動部38を収
容した収容部１とを一体に設けて車体フレーム構成と
し、後輪差動装置収容部Ｒには前記後下がり姿勢で延び
る収容部１内の伝動部38の動力にて回転する従動体41を
支持する横軸40を設け、該横軸40にて前記後輪差動装置
44,44を支持し且つ横軸40の左右両側に各々左右後輪差
動装置47,47を配置し、更に、横軸40の機体後方側に後
輪差動装置44,44にて分岐された動力を左右後車軸51,51
に伝達する左右歯車49,49を支持する軸48を配置して、
収容部１から左右後車軸51,51までの伝動ケース全体を
後下がり姿勢に構成した農用走行車体とした。(Means for Solving the Problems) In order to solve the above problems, the present invention provides left and right front wheels.
Front wheel differential device 8 that splits power to allow left and right differentials to 64, 64
And a rear wheel differential 44, which divides the power to the left and right rear wheels 55, 55 so as to be able to perform left and right differentials. The rear wheel differential device accommodating portion R for accommodating the rear wheel 44 is disposed outside and rearward between the left and right front wheels 64, 64, and a transmission mechanism 28, 21, 20, 20, which transmits the power from the engine to a plurality of gears in a shiftable manner. The transmission unit 5 for accommodating the transmission gear 27 is connected to the front wheel differential unit receiving unit F, and the front wheel differential unit receiving unit F and the rear wheel differential unit receiving unit R pass through the transmission unit. Power to rear wheel differential 44,44
The transmission unit 38 is integrally connected by a receiving unit 1 that extends in the front-rear direction of the vehicle body and extends rearward and downward toward the outside between the left and right front wheels 64, 64. The unit 5, the front wheel differential unit housing unit F, the rear wheel differential unit housing unit R, and the housing unit 1 housing the transmission unit 38 for transmitting to the rear wheel differential units 44, 44 are integrally provided to form a vehicle body frame. The rear wheel differential device housing portion R is provided with a horizontal shaft 40 that supports a driven body 41 that is rotated by the power of the transmission portion 38 in the housing portion 1 extending in the rearwardly lowered posture. Rear wheel differential
Left and right rear wheel differentials 47, 47 are disposed on the left and right sides of the horizontal axis 40, respectively, and further branched to the rear of the horizontal axis 40 by the rear wheel differentials 44, 44. Left and right rear axle 51,51
The shaft 48 that supports the left and right gears 49, 49 that transmit to the
The entire transmission case from the housing part 1 to the left and right rear axles 51, 51 was an agricultural traveling vehicle body configured to have a rearwardly lowered posture.

（発明の作用及び効果） この発明の農用走行車体は、変速伝動機構収容部５と
前輪差動装置収容部Ｆと後輪差動装置収容部Ｒと後輪差
動装置44,44に伝達する伝動部38を収容した収容部１と
を一体に設けて車体フレーム構成としたので、後輪差動
装置に動力を伝達する伝動部を一旦伝動装置の収容部内
から外に取り出す構造を省略できてそのぶん部品点数が
少ないものとなってコストアップとなるのを回避でき、
且つ、後輪差動装置収容部の左右から左右の後輪へ動力
を伝達する左右の伝動部が前後に長くなることにより車
体重量が重くなることをできるだけ抑えたものとなり、
車体重量の軽量化が図れ、しかも、後輪差動装置収容部
Ｒには前記後下がり姿勢で延びる収容部１内の伝動部38
の動力にて回転する従動体41を支持する横軸40を設け、
該横軸40に前記後輪差動装置44,44を支持し且つ横軸40
の左右両側に各々左右後輪制動装置47,47を配置し、更
に、横軸40の機体後方側に後輪差動装置44,44にて分岐
された動力を左右後車軸51,51に伝達する左右歯車49,49
を支持する軸48を配置して、収容部１から左右後車軸5
1,51までの伝動ケース全体を後下がり姿勢に構成したの
で、簡潔な伝動構成で車体重心を低く構成でき、安定し
た走行が可能となり、従って、従来例の特別に設けたフ
レームで各収容部を配置した構成に比して、軽量で且つ
走行安定性に優れた小型の農用走行車体を得ることがで
きる。(Functions and Effects of the Invention) The agricultural traveling vehicle body according to the present invention transmits the transmission to the transmission mechanism 5, the front wheel differential housing F, the rear wheel differential housing R, and the rear wheel differentials 44, 44. Since the housing 1 accommodating the transmission 38 is integrally provided to form a body frame, a structure for temporarily removing the transmission for transmitting power to the rear wheel differential from the housing of the transmission can be omitted. It is possible to avoid the cost increase due to the reduced number of parts,
In addition, since the left and right transmission portions for transmitting power from the left and right of the rear wheel differential device accommodating portion to the left and right rear wheels are lengthened back and forth, the weight of the vehicle body is reduced as much as possible,
The weight of the vehicle body can be reduced, and the rear wheel differential device housing portion R has a transmission portion 38 in the housing portion 1 extending in the rear-down position.
Provide a horizontal shaft 40 that supports the driven body 41 that rotates with the power of
The horizontal axis 40 supports the rear wheel differentials 44, 44 and the horizontal axis 40
Right and left rear wheel braking devices 47, 47 are arranged on both left and right sides of the vehicle, and the power branched by the rear wheel differential devices 44, 44 on the rear side of the axle 40 is transmitted to the left and right rear axles 51, 51. Left and right gears 49,49
Axle 48 that supports
The entire transmission case up to 1,51 is configured in a rearward-lowering position, which makes it possible to reduce the weight of the vehicle with a simple transmission configuration and enable stable running. As compared with the configuration in which is disposed, it is possible to obtain a small-sized agricultural traveling vehicle body that is lightweight and has excellent traveling stability.

（実施例） つぎに、この発明の実施例を説明する。(Example) Next, an example of the present invention will be described.

前後に向う縦筒１の前の部分に、左右一対の前車軸筒
2,3が十字に交わる形で一体的に設けられて主歯車箱４
が構成される。なお、製作上、右の前車軸筒２と縦筒１
とは、アルミ鋳物で一体に作られ、左の前車軸筒３は、
ボルトナットで縦筒１の側面に固定される。A pair of left and right front axle cylinders are provided in front of the vertical cylinder 1
The main gear box 4 is provided integrally with two or three crosses.
Is configured. The right front axle cylinder 2 and the vertical cylinder 1
Is made of aluminum casting and the left front axle tube 3
It is fixed to the side of the vertical cylinder 1 with bolts and nuts.

その縦筒１の前後には、変速歯車箱５と後輪伝動歯車
箱６とが固定され、前車軸筒2,3の外端にはそれぞれ前
輪歯車箱7,7が固定され、この主歯車箱４の上記の縦筒
１と前車軸2,3とが交叉する位置に前輪差動装置８が取
付けられる。したがって、主歯車箱４は、図１に示すよ
うに左右の前輪64,64の間に配置される前輪歯車箱7,7の
間にあって前輪差動装置８を収容する前輪差動装置収容
部Ｆを有するものとなっている。A transmission gear box 5 and a rear wheel transmission gear box 6 are fixed before and after the vertical cylinder 1, and front wheel gear boxes 7, 7 are fixed to outer ends of the front axle cylinders 2, 3, respectively. A front wheel differential device 8 is attached to the box 4 at a position where the vertical cylinder 1 and the front axles 2 and 3 intersect. Therefore, the main gear box 4 is located between the front wheel gear boxes 7, 7 disposed between the left and right front wheels 64, 64 as shown in FIG. It has what has.

変速歯車箱５には、前後に向う入力軸９が支えられ、
その前の突端に２段のプーリ10,11が固定される。エン
ジンの出力側12にも一対のプーリ13,14が固定され、こ
れらのプーリ10,13およびプーリ11,14にそれぞれベルト
15,16が巻き掛けられ、ベルト15を用いて伝動すると、
入力軸９が高速で回り、ベルト16を用いて伝動すると、
入力軸９が低速で回るように構成される。The input shaft 9 facing forward and backward is supported on the transmission gear box 5,
Two-stage pulleys 10, 11 are fixed to the front end. A pair of pulleys 13 and 14 are also fixed to the output side 12 of the engine, and these pulleys 10 and 13 and
When 15 and 16 are wound and transmitted using belt 15,
When the input shaft 9 rotates at high speed and is transmitted using the belt 16,
The input shaft 9 is configured to rotate at a low speed.

入力軸９には、変速歯車箱５内において５枚の歯車1
7,18,19,20及び21が一定の間隔で固定されている。変速
軸22は、入力軸９と平行に支えられ、後端が主歯車箱４
内に伸び、その先に固定された傘歯車23が前輪差動装置
８のリングギヤ24に噛み合っている。The input shaft 9 has five gears 1 in the transmission gear box 5.
7, 18, 19, 20, and 21 are fixed at regular intervals. The transmission shaft 22 is supported in parallel with the input shaft 9, and the rear end thereof is
And a bevel gear 23 fixed at the end thereof meshes with a ring gear 24 of the front wheel differential 8.

中間軸25は、前から見て入力軸９と変速軸22とで三角
形となるように支えられ、２枚の歯車が一体に出来たPT
O変速歯車26が、その中間軸25に前後には移動するが回
転はしないように取付けられ、その移動で前の歯車と後
の歯車とがそれぞれ歯車17および歯車18に選択的に噛み
合うように出来ている。The intermediate shaft 25 is supported by the input shaft 9 and the transmission shaft 22 so as to form a triangle when viewed from the front, and a PT in which two gears are integrally formed.
The O transmission gear 26 is mounted on the intermediate shaft 25 so as to move back and forth but does not rotate, so that the front gear and the rear gear selectively mesh with the gears 17 and 18 respectively. It is made.

２枚の歯車が一体に出来た後進歯車27が、中間軸25に
回転自在に取付けられ、この後進歯車27の前の歯車が歯
車19に噛み合っている。A reverse gear 27 in which two gears are integrally formed is rotatably mounted on the intermediate shaft 25, and a gear in front of the reverse gear 27 meshes with the gear 19.

２枚の歯車が一体に出来た変速歯車28が、変速軸22に
前後には移動するが回転はしないように取付けられ、後
側の小歯車29が歯車21に噛み合い、前に移動すると、そ
の噛み合いが外れて前側の大歯車30が歯車20に噛み合
い、さらに前に移動すると、この大歯車30が後進歯車27
の後側の歯車に噛み合うように出来ている。したがっ
て、これら歯車28,21,20,27は、エンジンからの動力を
複数段に変速可能に伝達する変速伝動機構を構成する。
また、この変速伝動機構を収容する変速伝動機構収容部
である変速歯車箱５は、前記のように縦筒１の前側、即
ち、図２に示すように前輪差動装置収容部Ｆに連設した
ものとなっている。A transmission gear 28 made of two gears is attached to the transmission shaft 22 so as to move back and forth but does not rotate. When the rear small gear 29 meshes with the gear 21 and moves forward, When the gear is disengaged and the large gear 30 on the front side meshes with the gear 20 and moves further forward, the large gear 30
It is made to mesh with the rear gear. Therefore, these gears 28, 21, 20, and 27 constitute a transmission mechanism for transmitting the power from the engine to a plurality of stages so as to be capable of shifting.
The speed change gear box 5 which is a speed change transmission mechanism housing portion for housing the speed change transmission mechanism is connected to the front side of the vertical cylinder 1 as described above, that is, the front wheel differential device housing portion F as shown in FIG. It has become.

軸31が中間軸25と平行に支えられ、中間軸25に固定さ
れた歯車32と噛み合っている歯車33が回転自在に取付け
られている。軸31の先端には、クラッチ爪34が設けら
れ、歯車33から前に伸びる爪35に噛み合ったり離れたり
するように構成されている。なお、これを苗植機に用い
るときは、このクラッチ爪34を軸31が一定の位置で停止
する定位置停止クラッチに構成する。A shaft 31 is supported in parallel with the intermediate shaft 25, and a gear 33 meshing with a gear 32 fixed to the intermediate shaft 25 is rotatably mounted. A clutch claw 34 is provided at the tip of the shaft 31 and is configured to mesh with or separate from a claw 35 extending forward from the gear 33. When this is used in a seedling planting machine, this clutch claw 34 is configured as a fixed position stop clutch in which the shaft 31 stops at a fixed position.

軸31の後端からPTO軸36が伸びて変速歯車箱５の後に
突出する。軸31とPTO軸36の間には、過負荷で伝達を停
止する安全クラッチ37が設けられる。A PTO shaft 36 extends from the rear end of the shaft 31 and projects behind the transmission gear box 5. Between the shaft 31 and the PTO shaft 36, a safety clutch 37 for stopping transmission due to overload is provided.

縦筒１内の伝動軸38の先端に傘歯車39が固定され、こ
の傘歯車39がリングギヤ24に噛み合っている。後輪伝動
歯車箱６内の横軸40の中央部に傘歯車41が取付けられ、
伝動軸38の後端に固定された傘歯車42がこれに噛み合っ
ている。傘歯車41は、左右に爪43,43を備えている。左
右一対の後輪クラッチ44,44が横軸40に左右に移動する
ように取付けられ、外端のばね45,45で内側に押されて
その爪46,46が爪43,43に噛み合うように構成される。そ
れぞれの後輪クラッチ44,44の外端には、ばね45,45に抗
して外側に移動させると、この後輪クラッチ44,44に制
動が加えられる後輪制動装置47が設けられている。な
お、後述するように、前進方向を大きく変えるとき、右
又は左の後輪クラッチ44を操作して右又は左の後輪55へ
の伝動を絶つことができるので、この左右の後輪クラッ
チ44,44は、左右の後輪55,55に左右差動可能に動力を分
岐する後輪差動装置として作動するものとなる。そし
て、この後輪差動装置としての後輪クラッチ44,44を収
容する後輪差動装置収容部Ｒを有する後輪伝動歯車箱６
は、図１に示すように、左右前輪64,64間の外側後方に
配置して設けたもとのなっている。また、前記変速伝動
機構28,21,20,27を経た動力を後輪クラッチ44,44に伝達
する伝動部である前記伝動軸38を収容する収容部として
の縦筒１は、前記のように車体の前後方向に延び、且
つ、図１に示すように左右前輪64,64間の外側方向に向
けて後下がり姿勢で延びるよう設けている。A bevel gear 39 is fixed to the tip of a transmission shaft 38 in the vertical cylinder 1, and this bevel gear 39 is engaged with the ring gear 24. A bevel gear 41 is attached to the central portion of the horizontal shaft 40 in the rear wheel transmission gear box 6,
A bevel gear 42 fixed to the rear end of the transmission shaft 38 meshes with this. The bevel gear 41 has claws 43 on the left and right. A pair of left and right rear wheel clutches 44, 44 are attached to the horizontal shaft 40 so as to move left and right, and are pushed inward by outer end springs 45, 45 so that the claws 46, 46 mesh with the claws 43, 43. Be composed. At the outer ends of the respective rear wheel clutches 44, 44, there are provided rear wheel braking devices 47 for applying braking to the rear wheel clutches 44, 44 when moved outward against the springs 45, 45. . As will be described later, when the forward direction is largely changed, the transmission to the right or left rear wheel 55 can be cut off by operating the right or left rear wheel clutch 44. , 44 operate as a rear wheel differential device that branches the power to the left and right rear wheels 55, 55 so as to be able to make left and right differentials. A rear wheel transmission gear box 6 having a rear wheel differential device housing portion R for housing rear wheel clutches 44, 44 as the rear wheel differential device.
As shown in FIG. 1, the original is disposed on the outer rear side between the left and right front wheels 64, 64. In addition, the vertical cylinder 1 as an accommodating portion for accommodating the transmission shaft 38, which is a transmission portion for transmitting the power passing through the speed change transmission mechanisms 28, 21, 20, 27 to the rear wheel clutches 44, 44, as described above, It is provided so as to extend in the front-rear direction of the vehicle body and to extend rearward and downward in an outward direction between the left and right front wheels 64, 64 as shown in FIG.

左右一対の伝動軸48,48が横軸40と平行に設けられ、
一対の歯車49,49がその内端に固定される。前記の爪46,
46は、横長に出来ていて、クラッチ44,44が左右に移動
しても離れないように歯車49,49と噛み合っている。A pair of left and right transmission shafts 48, 48 are provided in parallel with the horizontal shaft 40,
A pair of gears 49, 49 are fixed to the inner ends. Said nail 46,
46 is formed in a horizontally long shape, and meshes with the gears 49, 49 so that the clutches 44, 44 do not separate even if they move left and right.

板金で作られた一対の後輪ケース50,50が後輪伝動歯
車箱６の左右から斜め後下がりに向って延び、下端でそ
れぞれ後車軸51,51を支えている。それぞれの伝動軸48,
48の両端は、後輪ケース50,50内に延びてスプロケット5
2,52が固定され、後車軸51,51に固定されたスプロケッ
ト53,53とこのスプロケット52,52とにチェン54,54が巻
き掛けられている。一対の後輪55,55がそれぞれの後車
軸51,51の外端に固定される。したがって、後輪差動装
置収容部Ｒの左右両側部に左右の後輪55,55に伝動する
伝動部を収容する左右後輪ケース50,50を設けてその左
右両端から突出させた後車軸51,51に後輪55,55を取り付
けている。A pair of rear wheel cases 50, 50 made of sheet metal extend obliquely downward and rearward from the left and right of the rear wheel transmission gear box 6, and support the rear axles 51, 51 at the lower ends, respectively. Each transmission shaft 48,
Both ends of the 48 extend into the rear wheel cases 50, 50
2, 52 are fixed, and chains 54, 54 are wound around sprockets 53, 53 fixed to the rear axles 51, 51 and the sprockets 52, 52, respectively. A pair of rear wheels 55, 55 are fixed to outer ends of the respective rear axles 51, 51. Therefore, left and right rear wheel cases 50, 50 for accommodating transmission parts for transmitting to the left and right rear wheels 55, 55 are provided on both left and right sides of the rear wheel differential device accommodation part R, and rear axles 51 protruding from both left and right ends thereof. , 51 are attached with rear wheels 55,55.

一対の差動軸56,56が前輪差動装置８から左右に延び
てそれぞれの前輪歯車箱7,7に達し、外端に傘歯車57,57
が固定される。一対の伝動軸58,58が前輪歯車軸7,7から
斜め下方に延び、これに固定された傘歯車59,59が傘歯
車57,57と噛み合う。一対の操舵ケース60,60がそれぞれ
の伝動軸58,58の下端に取付けられ、この操舵ケース60,
60の下端には、外に突出する前車軸61,61が支えられ、
伝動軸58,58の下端の傘歯車62,62と前車軸61,61の内端
の傘歯車63,63とが噛み合う。一対の前輪64,64がそれぞ
れの前車軸61,61の端に固定される。したがって、前輪
差動装置収容部Ｆの左右両側部に左右の前輪64,64に伝
動する伝動部を収容する左右前輪伝動収容部2,3・7,7・
60,60を設けてその左右両端から突出させた前車軸61,61
に前輪64,64を取り付けている。A pair of differential shafts 56, 56 extend left and right from the front wheel differential 8 to reach the respective front wheel gear boxes 7, 7, and bevel gears 57, 57 at the outer ends.
Is fixed. A pair of transmission shafts 58, 58 extend obliquely downward from the front wheel gear shafts 7, 7, and the bevel gears 59, 59 fixed thereto mesh with the bevel gears 57, 57. A pair of steering cases 60, 60 are attached to the lower ends of the transmission shafts 58, 58, respectively.
At the lower end of 60, front axles 61, 61 projecting outward are supported,
The bevel gears 62, 62 at the lower ends of the transmission shafts 58, 58 mesh with the bevel gears 63, 63 at the inner ends of the front axles 61, 61. A pair of front wheels 64, 64 are fixed to the ends of the respective front axles 61, 61. Therefore, the left and right front wheel transmission housings 2, 3, 7, 7, 7, which house the transmissions for transmitting to the left and right front wheels 64, 64 on the left and right sides of the front wheel differential device housing F, respectively.
Front axles 61, 61 provided with 60, 60 and protruding from both left and right ends
The front wheels 64, 64 are attached to.

なお、クラッチ65を左の差動軸56の内端部に軸方向に
は移動するが回らないように取付け、図示しないばねで
外側に押し、回動式のレバー66で内側に押し寄せると、
その爪が前輪差動装置８の爪に噛み合って、前輪差動装
置８が差動しなくなる（デフがロックされる）ように構
成する。When the clutch 65 is attached to the inner end of the left differential shaft 56 so as to move in the axial direction but not rotate, and is pushed outward by a spring (not shown) and pushed inward by a rotary lever 66,
The claws of the front wheel differential 8 are engaged with the claws of the front wheel differential 8, so that the front wheel differential 8 does not perform the differential operation (the differential is locked).

上記のように構成された走行車体は、エンジンの回転
がその出力軸12からベルト15又はベルト16で入力軸９に
伝えられる。なお、これを苗植機に用いる場合、作業中
は、変速歯車28の噛み合いを低速にして用いる。そし
て、条件の良い圃場での苗植作業では、高速側のベルト
15を用いて伝動し、枕地で旋回するときや条件の悪い圃
場での苗植作業では、低速側のベルト16を用いて伝動す
る。In the traveling vehicle body configured as described above, the rotation of the engine is transmitted from the output shaft 12 to the input shaft 9 via the belt 15 or the belt 16. When this is used for a seedling planting machine, during operation, the meshing of the transmission gear 28 is used at a low speed. In the seedling planting work in a field with good conditions, the high-speed belt
The transmission is performed using the belt 16 on the low-speed side when the vehicle is turned on the headland and when seedling is planted in a field with poor conditions.

入力軸９の回転は、作業中、歯車20・大歯車30・変速
軸22・傘歯車23およびリングギヤ24をこの順に伝わって
前輪差動装置８に達し、そののち、左右に分かれ、それ
ぞれ差動軸56,56・傘歯車57,57・傘歯車59,59・伝動軸5
8,58・傘歯車62,62・傘歯車63,63および前車軸61,61を
この順に伝わって、それぞれの前輪64,64に達する。During operation, the rotation of the input shaft 9 is transmitted through the gear 20, the large gear 30, the transmission shaft 22, the bevel gear 23, and the ring gear 24 in this order to reach the front wheel differential device 8, and then to the left and right, and each of them is differentially driven. Shaft 56,56 ・ Bevel gear 57,57 ・ Bevel gear 59,59 ・ Transmission shaft 5
8,58 bevel gears 62,62, bevel gears 63,63 and front axles 61,61 travel in this order to reach the respective front wheels 64,64.

また、リングギヤ24の回転は、傘歯車39・伝動軸38お
よび傘歯車42をこの順に伝わって傘歯車41に達したの
ち、左右に分かれ、それぞれの爪43,43・爪46,46・歯車
49,49・伝動軸48,48・スプロケット52,52・チェン54,54
・スプロケット53,53および後車軸51,51をこの順に伝わ
ってそれぞれの後輪55,55に達する。すなわち、走行車
体は、それぞれの前輪64,64と後輪55,55の回転で前進す
る。In addition, the rotation of the ring gear 24 is transmitted through the bevel gear 39, the transmission shaft 38, and the bevel gear 42 in this order, and reaches the bevel gear 41, and then is divided into right and left, and the respective claws 43, 43, claws 46, 46, and gears
49,49 ・ Transmission shaft 48,48 ・ Sprocket 52,52 ・ Chain 54,54
-The sprockets 53, 53 and the rear axles 51, 51 are transmitted in this order to reach the respective rear wheels 55, 55. That is, the traveling vehicle body advances by the rotation of the front wheels 64, 64 and the rear wheels 55, 55.

ここに、入力軸９の回転は、歯車18又は歯車17、PTO
変速歯車26・中間軸25・歯車32・歯車33・爪35・クラッ
チ爪34・軸31および安全クラッチ37をこの順に伝わって
PTO軸36に達し、苗植装置が駆動され、苗の移植作業が
行われる。Here, the rotation of the input shaft 9 is controlled by the gear 18 or the gear 17, the PTO
The transmission gear 26, the intermediate shaft 25, the gear 32, the gear 33, the pawl 35, the clutch pawl 34, the shaft 31 and the safety clutch 37 are transmitted in this order.
When the plant reaches the PTO shaft 36, the seedling planting apparatus is driven, and the seedling transplanting operation is performed.

そして、ステアリングハンドルを操作すると、左右の
操舵ケース60,60がそれぞれの伝動軸58,58を中心に回動
し、前輪64,64が操舵される。また、左右の前輪64,64の
抵抗に差が生じると、前輪差動装置８がそれぞれの差動
軸56,56の回転速度を調整する。Then, when the steering wheel is operated, the left and right steering cases 60, 60 rotate around the respective transmission shafts 58, 58, and the front wheels 64, 64 are steered. When a difference occurs between the resistances of the left and right front wheels 64, 64, the front wheel differential device 8 adjusts the rotational speeds of the respective differential shafts 56, 56.

また、前進方向を大きく変えるときは、操舵ケース6
0,60の作動と併せて右又は左の後輪クラッチ44を外側に
移動する。すると、その爪46が爪43から離れ、右又は左
の後輪55に伝わっていた動力が断たれる。その後輪クラ
ッチ44をさらに外側に移動すると、制動装置47がクラッ
チ44に制動を与え、後輪55の付き回りが防止され、走行
車体が小さな径で旋回する。When changing the forward direction greatly, use steering case 6
The right or left rear wheel clutch 44 is moved outward in conjunction with the operation of 0,60. Then, the claw 46 separates from the claw 43, and the power transmitted to the right or left rear wheel 55 is cut off. Thereafter, when the wheel clutch 44 is further moved outward, the braking device 47 applies a brake to the clutch 44 to prevent the rear wheel 55 from rotating around and the traveling vehicle body turns with a small diameter.

つぎに、この走行車体を条件の良い路上で速く走行し
たいときは、変速歯車28を後に移動させ、図のように、
その小歯車29を歯車21に噛み合わす。すると、入力軸29
の回転は、歯車21および小歯車29を経て変速軸22に伝わ
るので、前よりも前輪64と後輪55の回転が速くなる。Next, when it is desired to run the traveling vehicle quickly on a road with good conditions, the transmission gear 28 is moved backward, and as shown in the figure,
The small gear 29 meshes with the gear 21. Then, input shaft 29
Is transmitted to the transmission shaft 22 via the gear 21 and the small gear 29, so that the rotation of the front wheel 64 and the rear wheel 55 is faster than that of the front.

また、この走行車体を後進させるときは、この変速歯
車28を最も前に移動させ、その大歯車30を後進歯車27の
後側の歯車に噛み合わす。すると、入力軸９の回転は、
中間軸25を経て変速軸22に伝わり、この変速軸22が逆転
し、前輪64と後輪55とが逆転して走行車体が後進する。When the traveling vehicle body is moved backward, the transmission gear 28 is moved to the forefront, and the large gear 30 meshes with the rear gear of the reverse gear 27. Then, the rotation of the input shaft 9 becomes
The power is transmitted to the transmission shaft 22 via the intermediate shaft 25, and the transmission shaft 22 rotates in the reverse direction, so that the front wheels 64 and the rear wheels 55 rotate in the reverse direction, so that the traveling vehicle body moves backward.

そして、この走行車体は、前輪差動装置収容部Ｆと後
輪差動装置収容部Ｒとを、変速伝動機構を経た動力を後
輪差動装置44,44に伝達する伝動部38を収容して車体の
前後方向に延び且つ左右前輪64,64間の外側後方に向け
て後下がり姿勢で延びる収容部１で一体的に連結した構
成なので、後輪差動装置に動力を伝達する伝動部を一旦
伝動装置の収容部内から外に取り出す構造を省略できて
そのぶん部品点数が少ないものとなってコストアップと
なるのを回避でき、且つ、後輪差動装置収容部の左右か
ら左右の後輪へ動力を伝達する左右の伝動部が前後に長
くなることにより車体重量が重くなることをできるだけ
抑えたものとなり、車体重量の軽量化が図れ、しかも、
前輪差動装置収容部Ｆと後輪差動装置収容部Ｒとを一体
的に連結する前記収容部１を後下がり姿勢に設けたの
で、車体重心を低く構成でき、安定した走行が可能とな
る。The traveling vehicle body accommodates a front wheel differential device accommodating portion F and a rear wheel differential device accommodating portion R, and a power transmitting portion 38 that transmits power passing through a transmission mechanism to the rear wheel differential devices 44, 44. The power transmission unit for transmitting power to the rear wheel differential device is integrally connected by the housing unit 1 extending in the front-rear direction of the vehicle body and extending rearward and downward toward the outside rear between the left and right front wheels 64, 64. The structure that once takes out from the housing of the transmission can be omitted, so that the number of parts can be reduced and the cost can be avoided, and the left and right rear wheels from the left and right of the rear wheel differential housing can be avoided. By increasing the length of the left and right transmission parts that transmit power to the front and rear, the weight of the vehicle body is reduced as much as possible, so that the weight of the vehicle body can be reduced, and
Since the housing portion 1 for integrally connecting the front wheel differential device housing portion F and the rear wheel differential device housing portion R is provided in a rearward-downward posture, the vehicle center of gravity can be configured to be low, and stable running can be performed. .

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

第１図はこの発明を施した農用走行車体を備えた苗植機
の側面図、第２図はその伝動機構の平面図である。 なお、図中の主な符号は、つぎの通りである。 1:縦筒（収容部） 2,3:前車軸筒 5:変速伝動機構収容部 7,7:前輪歯車箱 8:前輪差動装置 38:伝動軸（伝動部） 40:横軸 41:従動体（傘歯車） 44,44:後輪差動装置 47,47:左右後輪制動装置 48:軸（伝動軸） 49,49:左右歯車 50,50:後輪ケース 51,51:後車軸 55,55:後輪 60,60:操舵ケース 61,61:前車軸 64,64:前輪 F:前輪差動装置収容部 R:後輪差動装置収容部FIG. 1 is a side view of a seedling plant equipped with an agricultural traveling vehicle body according to the present invention, and FIG. 2 is a plan view of a transmission mechanism thereof. The main symbols in the figure are as follows. 1: Vertical cylinder (housing) 2,3: Front axle cylinder 5: Transmission mechanism housing 7,7: Front wheel gear box 8: Front wheel differential 38: Transmission shaft (transmission) 40: Horizontal shaft 41: Follower Body (bevel gear) 44,44: Rear wheel differential device 47,47: Left and right rear wheel braking device 48: Shaft (transmission shaft) 49,49: Left and right gear 50,50: Rear wheel case 51,51: Rear axle 55 , 55: Rear wheel 60, 60: Steering case 61, 61: Front axle 64, 64: Front wheel F: Front wheel differential device housing R: Rear wheel differential device housing

───────────────────────────────────────────────────── フロントページの続き (72)発明者 草本 英之 愛媛県伊予郡砥部町八倉１番地 井関農 機株式会社技術部内 合議体 審判長 酒井 進 審判官 常盤 務 審判官 西川 一 (56)参考文献 特開 昭60−179338（ＪＰ，Ａ) 特開 昭59−213523（ＪＰ，Ａ) 特開 昭62−131822（ＪＰ，Ａ) 特開 昭63−38032（ＪＰ，Ａ) 特開 昭57−186408（ＪＰ，Ａ) 特開 昭63−293358（ＪＰ，Ａ) 特開 昭63−159104（ＪＰ，Ａ) 実開 昭61−135775（ＪＰ，Ｕ) 実開 昭64−27464（ＪＰ，Ｕ) 実開 昭63−189923（ＪＰ，Ｕ) 実開 昭62−26728（ＪＰ，Ｕ) 実開 昭63−26440（ＪＰ，Ｕ) ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideyuki Kusamoto 1 Toya-cho, Tobe-cho, Iyo-gun, Ehime Prefecture Iseki Agricultural Machinery Co., Ltd. JP-A-60-179338 (JP, A) JP-A-59-213523 (JP, A) JP-A-62-131822 (JP, A) JP-A-63-38032 (JP, A) JP-A-57-186408 ( JP, A) JP-A-63-293358 (JP, A) JP-A-63-159104 (JP, A) Actually open Showa 61-135775 (JP, U) Actually open Showa 64-27464 (JP, U) Actually open Sho-63-189923 (JP, U) Sho-sho 62-62828 (JP, U) Sho-sho 63-26440 (JP, U)

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】左右の前輪64,64に左右差動可能に動力を
分岐する前輪差動装置８を収容する前輪差動装置収容部
Ｆを左右の前輪64,64の間に配置して設けるとともに、
左右の後輪55,55に左右差動可能に動力を分岐する後輪
差動装置44,44を収容する後輪差動装置収容部Ｒを左右
前輪64,64間の外側後方に配置して設け、エンジンから
の動力を複数段に変速可能に伝達する変速伝動機構28,2
1,20,27を収容する変速伝動機構収容部５を前記前輪差
動装置収容部Ｆに連設し、該前輪差動装置収容部Ｆと後
輪差動装置収容部Ｒとを、前記変速伝動構造を経た動力
を後輪差動装置44,44に伝達する伝動部38を収容して車
体の前後方向に延び且つ左右前輪64,64間の外側後方に
向けて後下がり姿勢で延びる収容部１で一体的に連結し
た構成として、変速伝動機構収容部５と前輪差動装置収
容部Ｆと後輪差動装置収容部Ｒと後輪差動装置44,44に
伝達する伝動部38を収容した収容部１とを一体に設けて
車体フレーム構成とし、後輪差動装置収容部Ｒには前記
後下がり姿勢で延びる収容部１内の伝動部38の動力にて
回転する従動体41を支持する横軸40を設け、該横軸40に
て前記後輪差動装置44,44を支持し且つ横軸40の左右両
側に各々左右後輪制動装置47,47を配置し、更に、横軸4
0の機体後方側に後輪差動装置44,44にて分岐された動力
を左右後車軸51,51に伝達する左右歯車49,49を支持する
軸48を配置して、収容部１から左右後車軸51,51までの
伝動ケース全体を後下がり姿勢に構成したことを特徴と
する農用走行車体。1. A front wheel differential device accommodating portion F for accommodating a front wheel differential device 8 for splitting power to the left and right front wheels 64, 64 so as to be able to make left and right differential movements is provided between the left and right front wheels 64, 64. With
Rear wheel differential device housing portion R for housing rear wheel differential devices 44, 44 for branching power to left and right rear wheels 55, 55 so as to be able to differentially move left and right is disposed outside and rearward between left and right front wheels 64, 64. Transmission mechanism 28,2 for transmitting the power from the engine to a plurality of stages in a shiftable manner.
A transmission mechanism housing 5 for housing 1, 20, 27 is connected to the front wheel differential device housing portion F. The front wheel differential device housing portion F and the rear wheel differential device housing portion R An accommodating portion that accommodates a transmission portion 38 that transmits power passing through the transmission structure to the rear wheel differential devices 44, 44, extends in the front-rear direction of the vehicle body, and extends rearward and downward toward the outside rear between the left and right front wheels 64, 64. The transmission unit 38 for transmitting to the transmission unit 5, the front wheel differential unit receiving unit F, the rear wheel differential unit receiving unit R, and the rear wheel differential units 44, 44 The rear receiving unit R supports a driven body 41 which is rotated by the power of the transmission unit 38 in the receiving unit 1 extending in the rearwardly lowered posture. A horizontal shaft 40 is provided, the rear shaft differentials 44, 44 are supported by the horizontal shaft 40, and left and right rear wheel braking devices 47, 47 are disposed on both left and right sides of the horizontal shaft 40, respectively. , And the horizontal axis 4
A shaft 48 for supporting left and right gears 49, 49 for transmitting the power branched by the rear wheel differentials 44, 44 to the left and right rear axles 51, 51 is disposed on the rear side of the fuselage 0. An agricultural traveling vehicle body characterized in that the entire transmission case up to the rear axles 51, 51 is configured in a rearwardly lowered posture.