JPS6320582Y2

JPS6320582Y2 -

Info

Publication number: JPS6320582Y2
Application number: JP398384U
Authority: JP
Priority date: 1984-01-14
Filing date: 1984-01-14
Publication date: 1988-06-08
Also published as: JPS60115720U

Description

【考案の詳細な説明】この考案は、ミツシヨンケース内から左右の車
輪方向へ出力伝動する左右のミツシヨン出力軸
を、該左右のミツシヨン出力軸間でミツシヨンケ
ース内に配設されデフロツククラツチを附設して
ある差動装置の左右の出力軸でもつて構成して、
これらの左右のミツシヨン出力軸をミツシヨンケ
ースに、該ミツシヨンケースの左右の端部でベア
リングを介し支持させ、また上記差動装置に対し
入力伝動する伝動軸をミツシヨンケース内に、上
記ミツシヨン出力軸と平行させると共に左右のベ
アリングを介しミツシヨンケースに支持させて設
けて、ミツシヨンケースの外面上に形成した環状
のブレーキ室内で上記伝動軸に配して、該伝動軸
を選択的に制動するためのブレーキを設けてあ
る、自走式作業車のトランスミツシヨン装置に、
関するものである。[Detailed description of the invention] In this invention, the left and right transmission output shafts that transmit power from inside the transmission case to the left and right wheels are disposed inside the transmission case between the left and right transmission output shafts, and a differential clutch is connected to the transmission case. It consists of the left and right output shafts of the attached differential device,
These left and right transmission output shafts are supported in a transmission case via bearings at the left and right ends of the transmission case, and a transmission shaft that transmits input to the differential is placed inside the transmission case. The transmission shaft is provided parallel to the output shaft and supported by the transmission case via left and right bearings, and is placed on the transmission shaft in an annular brake chamber formed on the outer surface of the transmission case, and selectively controls the transmission shaft. The transmission device of a self-propelled work vehicle is equipped with a brake for braking.
It is related to

自走式作業車のミツシヨンケースをどのように
分割するか、つまり分割されたケース部の個数が
少なくその形成及び組立てが容易であること、そ
れでありながら各ケース部の鋳造による成形が容
易であること、ミツシヨンケース内への伝動部材
の組込みが容易となること、及びミツシヨンケー
ス内に無駄な空間部がないこと、等の要望を満た
すようにミツシヨンケースを、どのように分割す
るかは、自走式作業車のトランスミツシヨン装置
を設計する技術者が常に頭を痛める問題である。
そして上記のような要望の全てを満たすことは困
難であることから一般には、何れかの要望は無視
してミツシヨンケースを設計してしまうことが多
い。 How to divide the transmission case of a self-propelled work vehicle. In other words, the number of divided case parts is small and it is easy to form and assemble, and at the same time, it is easy to mold each case part by casting. How to divide the transmission case so as to satisfy the following requirements: 1. The transmission member should be easy to assemble into the transmission case, and there should be no wasted space in the transmission case. This is a question that always worries engineers who design transmission devices for self-propelled work vehicles.
Since it is difficult to satisfy all of the above requirements, it is common to design a mission case by ignoring any of the requirements.

例えば実開昭57−25032号公報に開示されてい
る冒頭記載タイプのトランスミツシヨン装置で
は、ミツシヨンケースの上下巾と横巾を短縮すべ
く、大きな上下巾及び横巾をそれぞれ有する差動
装置とブレーキとを、左右に振分けて設置する構
造を採用している。すなわち同公報のものはミツ
シヨンケース内で差動装置を左右の一側に片寄せ
て設置するといつた漸新なアイデイアを採用し、
差動装置とは反対側でミツシヨンケースの外面上
に、上下方向でみると差動装置と一部でオーバラ
ツプすることとなる環状のブレーキ室を形成し
て、同ブレーキ室内へと突入させた伝動軸に配し
てブレーキを設けている。 For example, in the transmission device of the type mentioned at the beginning disclosed in Japanese Utility Model Application Publication No. 57-25032, in order to shorten the vertical and horizontal widths of the transmission case, a differential device having large vertical and horizontal widths, respectively. A structure is adopted in which the brakes and brakes are installed separately on the left and right sides. In other words, the one in the same publication adopted the innovative idea of installing the differential gear to one side of the left and right inside the transmission case.
An annular brake chamber is formed on the outer surface of the transmission case on the opposite side from the differential gear, and partially overlaps with the differential gear when viewed vertically, and extends into the brake chamber. A brake is provided on the transmission shaft.

同公報のものは反面において、差動装置を一側
に片寄せていることから該差動装置を収容する大
径の収容部を有するケース部を、別形成したもの
となつていて、ミツシヨンケースが４個のケース
部に分割されてその個数が多いこと、及び差動装
置からブレーキが位置する側へと出力伝動するミ
ツシヨン出力軸が長くなり同出力軸の支持の安定
性がやや欠けること、及び長尺の該ミツシヨン出
力軸の外周部でミツシヨンケース内に無駄な空間
部が存在すること、といつた難点を有している。 On the other hand, in the case of the same publication, since the differential gear is shifted to one side, a case part having a large-diameter accommodating part for accommodating the differential gear is formed separately. The case is divided into four case parts, which are large in number, and the transmission output shaft that transmits output from the differential gear to the side where the brake is located is long, making the support of the output shaft somewhat unstable. , and that there is a wasted space inside the mission case at the outer periphery of the long mission output shaft.

この考案の目的とするところは、最初に述べた
ようなトランスミツシヨン装置であつて、上記の
ような難点を解消し前記のような要望を極力満た
すように図つてある、自走式作業車の新規なトラ
ンスミツシヨン装置を、提供するにある。 The purpose of this invention is to create a self-propelled work vehicle, which is a transmission device as mentioned at the beginning, which is designed to solve the above-mentioned difficulties and satisfy the above-mentioned demands as much as possible. A novel transmission device is provided.

以下、図示の実施例についてこの考案を詳細に
説明する。 This invention will be described in detail below with reference to the illustrated embodiments.

第１図はこの考案の一実施例を装備した自走式
作業車を模式的に画いたもので、この作業車は、
左右の後輪１のみを回転駆動して走行を行なわせ
うる他、必要に応じ左右の前輪２も回転駆動して
四輪駆動による走行も行なわせることができる、
四輪駆動型のものに構成されている。すなわち同
作業車のエンジン３は機体後部に塔載され、この
エンジン３の前下方位置で機体上に設けられた油
圧伝導装置４を経て、左右の後輪１間で機体下面
側に配置されているミツシヨンケース５内へと動
力の伝達が行なわれ、同ミツシヨンケース５に支
持させてある左右の後輪１の回転駆動を行なうよ
うにされているのであるが、ミツシヨンケース５
内から左右の前輪２方向へ伝動する伝動軸機構６
を設けて、必要に応じ前輪駆動クラツチを入れて
前輪２の回転駆動も行なえることとしてある。車
輌の操向は通例のように左右の前輪２の旋回によ
つて行なうこととされていて、第１図において７
は、乗用座席８の前方に配置されている操向ハン
ドルである。図示の作業車は、機体の前部に除雪
機とかモア等の作業機９を装備させて、除雪作業
とか芝刈り作業とかに用いられるものとされてい
て、前記油圧伝導装置４から機体前部の作業機９
へと動力を伝達するためのPTO軸機構１０が設
けられている。 Figure 1 is a schematic drawing of a self-propelled work vehicle equipped with an embodiment of this invention.
In addition to being able to rotate only the left and right rear wheels 1 to drive the vehicle, if necessary, the left and right front wheels 2 can also be rotated to drive the vehicle in four-wheel drive.
It is configured as a four-wheel drive type. In other words, the engine 3 of the work vehicle is mounted on the rear of the fuselage, and the hydraulic transmission device 4 is installed on the fuselage at the lower front position of the engine 3, and is placed on the lower surface of the fuselage between the left and right rear wheels 1. Power is transmitted into the transmission case 5, which rotates the left and right rear wheels 1 supported by the transmission case 5.
Transmission shaft mechanism 6 that transmits power from the inside to the left and right front wheels in two directions
is provided so that the front wheels 2 can be rotationally driven by engaging the front wheel drive clutch if necessary. As is customary, steering of a vehicle is performed by turning the left and right front wheels 2.
is a steering handle located in front of the passenger seat 8. The illustrated working vehicle is equipped with a working machine 9 such as a snow blower or a mower at the front of the machine body, and is used for snow removal work or lawn mowing work. work equipment 9
A PTO shaft mechanism 10 is provided for transmitting power to.

第２図が上で概要を説明した伝動機構を示す機
構図であり、エンジン３は油圧伝導装置４の入力
軸である油圧ポンプ軸１１に対し、ベルト１２伝
動機構により入力する。油圧伝導装置４の出力軸
である油圧モータ軸１３はフレキシブル接手を介
し、前記ミツシヨンケース５のミツシヨン入力軸
１４へと接続されている。ミツシヨンケース４内
には、作業車の前後方向に沿う上記ミツシヨン入
力軸１４と平行させた中間軸１５及び前輪駆動軸
１６を設けてあると共に、作業車の左右方向に沿
わせて伝動軸１７及び左右のミツシヨン出力軸１
８Ｌ，１８Ｒを設けてある。ミツシヨン入力軸１
４と中間軸１５とはこれらの軸１４，１５に嵌着
した歯車１９，２０を互に噛合せることで連動連
結されており、また中間軸１５と前輪駆動軸１６
とは、前輪駆動軸１６上に中間軸１５上の歯車２
０に対し選択的に噛合せうるクラツチ歯車２１を
摺動のみ自在に設置して構成された前輪駆動クラ
ツチ２２により、選択的に連動連結可能とされて
いる。中間軸２５と伝動軸１７とは、これらの軸
１５，１７に嵌着した傘歯車２３，２４を互に噛
合せることによつて連動連結されている。左右の
ミツシヨン出力軸１８Ｌ，１８Ｒ間でミツシヨン
ケース５内には、左右後輪１用の差動装置２５が
設けられており、この差動装置２５のデフケース
２６に固定した大歯車２７に対し伝動軸１７に嵌
着した小歯車２８を噛合せることによつて、伝動
軸１７から差動装置２５への入力伝導を行なうこ
ととされている。 FIG. 2 is a mechanical diagram showing the transmission mechanism outlined above, and the engine 3 inputs input to the hydraulic pump shaft 11, which is the input shaft of the hydraulic transmission device 4, through a belt 12 transmission mechanism. A hydraulic motor shaft 13, which is an output shaft of the hydraulic transmission device 4, is connected to a transmission input shaft 14 of the transmission case 5 via a flexible joint. Inside the transmission case 4, there are provided an intermediate shaft 15 and a front wheel drive shaft 16 parallel to the transmission input shaft 14 extending in the longitudinal direction of the working vehicle. and left and right transmission output shafts 1
8L and 18R are provided. Mission input shaft 1
4 and the intermediate shaft 15 are interlocked and connected by mutually meshing gears 19 and 20 fitted on these shafts 14 and 15, and the intermediate shaft 15 and the front wheel drive shaft 16
gear 2 on the intermediate shaft 15 on the front wheel drive shaft 16
The front wheel drive clutch 22 is constructed by installing a clutch gear 21 that can be selectively engaged with the front wheel drive gear 21 so as to be slidable only, so that selective interlocking can be performed. The intermediate shaft 25 and the transmission shaft 17 are interlocked and connected by meshing bevel gears 23 and 24 fitted onto these shafts 15 and 17. A differential device 25 for the left and right rear wheels 1 is provided in the transmission case 5 between the left and right transmission output shafts 18L and 18R. Input is transmitted from the transmission shaft 17 to the differential gear 25 by meshing the small gear 28 fitted to the transmission shaft 17.

同様に第２図に示すように、左右のミツシヨン
出力軸１８Ｌ，１８Ｒは差動装置２５における１
対のドリブン傘歯車２５ａの各々が固定されてい
る左右の出力軸でもつて構成されており、また図
示の場合には同左右のミツシヨン出力軸１８Ｌ，
１８Ｒを左右の後輪１の車軸に兼用させて、該各
出力軸１８Ｌ，１８Ｒに各後輪１を取付けてあ
る。差動装置２６には、一側のミツシヨン出力軸
１８Ｒ上に摺動のみ自在に設けたクラツチ金物２
９を選択的に摺動変位させて作動せしめられるデ
フロツククラツチ３０が、附設されている。また
伝動軸１７の一端部に配して該伝動軸１７を選択
的に制動するためのブレーキ３１を設けてあり、
このブレーキ３１はその作動により、伝動軸１７
を制動することで左右の後輪１を制動する。前輪
駆動軸１６は前記伝動軸機構６を介して、左右前
輪２用の差動装置３２へと接続されている。第２
図において、３３は前輪用差動装置３２の左右の
出力軸を左右の前輪車軸２ａに対し減速連動連結
する左右の傘歯車減速機構、３４は前記PTO軸
機構１０中に設けたPTOクラツチである。 Similarly, as shown in FIG. 2, the left and right transmission output shafts 18L, 18R are
Each of the pair of driven bevel gears 25a is configured with fixed left and right output shafts, and in the case shown in the figure, the left and right transmission output shafts 18L,
18R is also used as the axle for the left and right rear wheels 1, and each rear wheel 1 is attached to each output shaft 18L, 18R. The differential device 26 includes a clutch metal fitting 2 that is slidably provided on the transmission output shaft 18R on one side.
A differential clutch 30 is provided which is actuated by selectively sliding displacement 9. Further, a brake 31 is provided at one end of the transmission shaft 17 for selectively braking the transmission shaft 17.
This brake 31 is activated by the transmission shaft 17.
By braking, the left and right rear wheels 1 are braked. The front wheel drive shaft 16 is connected to a differential device 32 for the left and right front wheels 2 via the transmission shaft mechanism 6. Second
In the figure, 33 is a left and right bevel gear reduction mechanism that connects the left and right output shafts of the front wheel differential 32 to the left and right front wheel axles 2a in a decelerating manner, and 34 is a PTO clutch provided in the PTO shaft mechanism 10. .

第３図がミツシヨンケース５の具体構造を示す
ものであつて、このミツシヨンケース５は、ミツ
シヨン出力軸１８Ｌ，１８Ｒ及び伝動軸１７に対
し直交する第１及び第２の分割面P₁，P₂に沿つ
て、第１，第２，第３のケース部５Ａ，５Ｂ，５
Ｃへと３分割されている。 FIG. 3 shows the specific structure of the transmission case 5, which has first and second dividing planes P ₁ , which are orthogonal to the transmission output shafts 18L, 18R and the transmission shaft 17. Along P ₂ , the first, second and third case parts 5A, 5B, 5
It is divided into three parts, C.

第１のケース部５Ａは第１の分割面P₁側の端
面を開放したものに形成されていて、前記したミ
ツシヨン入力軸１４と中間軸１５と前輪駆動軸１
６とは、この第１のケース部５Ａの前壁と該前壁
外面上に装着した軸受板３５とに支持させてあ
る。差動装置２５は第１のケース部５Ａに、第１
の分割面P₁側に片寄せて内装させてあり、差動
装置２５端から側外方向きに延びた筒状部３６を
該第１のケース部５Ａに形成して、一側のミツシ
ヨン出力軸１８Ｌを、該筒状部３６内を通過させ
ることとしてある。上記したミツシヨン出力軸１
８Ｌは筒状部３６の外端で第１のケース部５Ａに
ボールベアリング３７を介し支持されており、ま
た前記伝動軸１７の一端部を該第１のケース部５
Ａにボールベアリング３８を介し支持させると共
に、上記筒状部３６の内端で第１のケース部５Ａ
にデフケース２６の一端部を、ボールベアリング
３９を介し支持させている。 The first case part 5A is formed with an open end face on the side of the first dividing plane _P1 , and includes the transmission input shaft 14, the intermediate shaft 15, and the front wheel drive shaft 1.
6 is supported by the front wall of the first case portion 5A and a bearing plate 35 mounted on the outer surface of the front wall. The differential device 25 has a first
A cylindrical portion 36 extending outward from the end of the differential gear 25 is formed in the _first case portion 5A, and the transmission output on one side is offset toward the dividing plane P1 side. The shaft 18L is allowed to pass through the inside of the cylindrical portion 36. The above-mentioned transmission output shaft 1
8L is an outer end of the cylindrical portion 36 and is supported by the first case portion 5A via a ball bearing 37, and one end of the transmission shaft 17 is connected to the first case portion 5A.
A is supported by the ball bearing 38, and the first case part 5A is supported at the inner end of the cylindrical part 36.
One end of the differential case 26 is supported via a ball bearing 39.

次に第２のケース部５Ｂは、第１及び第２の分
割面P₁，P₂上に位置する左右の端面を開放して
あるものに形成されている。この第２のケース部
５Ｂの内面上にはミツシヨンケース５内へと突出
する支壁部４０を一体形成してあり、この支壁部
４０において第２のケース部５Ｂには、伝動軸１
７の他端部をボールベアリング４１を介し支持さ
せると共に、デフケース２６の他端部をボールベ
アリング４２を介し支持させてある。デフケース
２６の支持は、該ケース２６に固定された前記大
歯車２７のボス部でもつて行なわれている。 Next, the second case portion 5B is formed so that left and right end surfaces located on the first and second dividing planes P ₁ and P ₂ are open. A support wall portion 40 that protrudes into the transmission case 5 is integrally formed on the inner surface of the second case portion 5B.
7 is supported via a ball bearing 41, and the other end of the differential case 26 is supported via a ball bearing 42. The differential case 26 is supported by the boss portion of the large gear 27 fixed to the case 26.

第３のケース部５Ｃは第２の分割面P₂側の端
面を開放してあるものに形成されていて、側外方
向きに突出させて形成された筒状部４３において
他側のミツシヨン出力軸１８Ｒを、ボールベアリ
ング４４を介し支持している。 The third case part 5C is formed with an open end face on the side of the second dividing plane _P2 , and a cylindrical part 43 formed to protrude in the lateral direction allows the transmission output of the other side. The shaft 18R is supported via a ball bearing 44.

第３，第４図に示すように前記ブレーキ３１を
収容するための環状のブレーキ室４５をミツシヨ
ンケース５の外面上に設けてあるが、このブレー
キ室４５は第３図に示すように、前記支壁部４０
を内底壁とし第２のケース部５Ｂと第３のケース
部５Ｃとにそれぞれ設けた筒状部を左右方向で重
合させ外周壁として、形成設置されている。伝動
軸１７の他端部は前記ボールベアリング４１位置
からさらに該ブレーキ室４５内へと突入させてあ
つて、ブレーキ室４５内で伝動軸１７上にはブレ
ーキドラム３１ａを固定設置してある。ブレーキ
３１は、上記したブレーキドラム３１ａの内周面
にブレーキバンド３１ｂを対設してなる内拡式ブ
レーキに構成されており、ブレーキバンド３１ｂ
を選択的に拡張させるためのカム軸３１ｃは、ブ
レーキ室４５の蓋板４５ａに支持させてある。蓋
板４５ａは第４図に示すねじボルト４６により、
第３のケース部５Ｃへと取付けられている。第
３，第４図において４７は、ブレーキ室４５外で
カム軸３１ｃに取付けられたブレーキアームであ
り、図示省略のブレーキレバーへと接続されてい
る。 As shown in FIGS. 3 and 4, an annular brake chamber 45 for accommodating the brake 31 is provided on the outer surface of the transmission case 5. As shown in FIG. The supporting wall portion 40
The cylindrical parts provided in the second case part 5B and the third case part 5C are overlapped in the left-right direction to form an inner bottom wall and an outer circumferential wall. The other end of the transmission shaft 17 extends further into the brake chamber 45 from the position of the ball bearing 41, and a brake drum 31a is fixedly installed on the transmission shaft 17 within the brake chamber 45. The brake 31 is configured as an inwardly expanding brake in which a brake band 31b is provided oppositely to the inner peripheral surface of the brake drum 31a described above.
A camshaft 31c for selectively expanding the brake chamber 45 is supported by a cover plate 45a of the brake chamber 45. The cover plate 45a is secured by screw bolts 46 shown in FIG.
It is attached to the third case part 5C. In FIGS. 3 and 4, 47 is a brake arm attached to the camshaft 31c outside the brake chamber 45, and is connected to a brake lever (not shown).

次に前記デフロツククラツチ３０は、差動装置
２５の前記大歯車２７のボス部内周面と前記クラ
ツチ金物２９の外周面とにそれぞれ、互に噛合せ
うる爪３０ａ，３０ｂを形成して、ミツシヨン出
力軸１８Ｒ上でのクラツチ金物２９の摺動変位に
より該爪３０ａ，３０ｂを噛合せてクラツチ係合
させるものに、構成されている。クラツチ金物２
９は第２のケース部５Ｂと第３のケース部５Ｃと
の内部にまたがつて摺動変位するように設けられ
ており、以上よりしてデフロツククラツチ３０は
第２及び第３のケース部５Ｂ，５Ｃ内にまたがら
せてミツシヨンケース５に内装されている。 Next, the differential clutch 30 has pawls 30a and 30b that can be engaged with each other formed on the inner circumferential surface of the boss portion of the large gear 27 of the differential gear 25 and the outer circumferential surface of the clutch hardware 29, respectively. The claws 30a and 30b are engaged by sliding movement of the clutch metal fitting 29 on the output shaft 18R, thereby engaging the clutch. clutch hardware 2
Reference numeral 9 is provided so as to be able to slide between the second case part 5B and the third case part 5C. It is housed inside the mission case 5 so as to straddle 5B and 5C.

上記したクラツチ金物２９を選択的に摺動変位
させるためには該クラツチ金物２９に係合させて
あるデフヨーク４８を、デフヨーク軸４９に支持
させて設けてある。デフヨーク４８は、第２，第
３のケース部５Ｂ，５Ｃが何れも第２の分割面
P₂側の端面を開放したものであることからして
形成された空間部においてミツシヨンケース５内
に配置されており、またデフヨーク軸４９は第１
のケース部５Ａと第３のケース部５Ｃとに両端部
で支持されている。デフヨーク４８にはデフヨー
ク軸４９上に位置する部分でカム溝４８ａを形成
してあり、またデフヨーク軸４９には、第１のケ
ース５Ａの内面とデフヨーク４８の一端面との間
でデフヨーク軸４９上に配設せるリターンばね５
０の附勢力により上記カム溝４８ａのカム斜面が
接当するカムピン５１を、植設してある。デフヨ
ーク軸４９が回転変位せしめられるとカムピン５
１はカム溝４８ａのカム斜面でもつてデフヨーク
４８を、デフロツククラツチ３０が係合せしめら
れる方向に押して変位させる。デフヨーク軸４９
には第３のケース部５Ｃ外で、デフロツクペダル
（図示せず）へと接続されたクラツチアーム５２
を取付けてある。 In order to selectively slide and displace the clutch hardware 29 described above, a differential yoke 48 engaged with the clutch hardware 29 is supported by a differential yoke shaft 49. In the differential yoke 48, the second and third case portions 5B and 5C are both on the second dividing surface.
Since the end face on the _P2 side is open, the differential yoke shaft 49 is located inside the transmission case 5 in the space formed.
It is supported at both ends by the case part 5A and the third case part 5C. A cam groove 48a is formed in the differential yoke 48 at a portion located on the differential yoke shaft 49, and a cam groove 48a is formed in the differential yoke shaft 49 at a portion located on the differential yoke shaft 49 between the inner surface of the first case 5A and one end surface of the differential yoke 48. Return spring 5 which can be arranged in
A cam pin 51 is installed with which the cam slope of the cam groove 48a comes into contact with a biasing force of 0. When the differential yoke shaft 49 is rotated, the cam pin 5
1 uses the cam slope of the cam groove 48a to push and displace the differential yoke 48 in the direction in which the differential clutch 30 is engaged. Differential yoke shaft 49
The clutch arm 52 is connected to a differential pedal (not shown) outside the third case part 5C.
is installed.

第２及び第３のケース部５Ｂ，５Ｃは第１のケ
ース部５Ａに対し、第３，第４図に示すねじボル
ト５３によつて連結固定されている。 The second and third case parts 5B and 5C are connected and fixed to the first case part 5A by screw bolts 53 shown in FIGS. 3 and 4.

以上、実施例について説明して来たところから
明らかなように、この考案の自走式作業車のトラ
ンスミツシヨン装置は、ミツシヨンケース５内か
ら左右の車輪１方向へ出力伝動する左右のミツシ
ヨン出力軸１８Ｌ，１８Ｒを、該左右のミツシヨ
ン出力軸１８Ｌ，１８Ｒ間でミツシヨンケース５
内に配設されデフロツククラツチ３０を附設して
ある差動装置２５の左右の出力軸でもつて構成し
て、これらの左右のミツシヨン出力軸１８Ｌ，１
８Ｒをミツシヨンケース５に、該ミツシヨンケー
ス５の左右の端部でベアリング３７，４４を介し
支持させ、また上記差動装置２５に対し入力伝動
する伝動軸１７をミツシヨンケース５内に、上記
ミツシヨン出力軸１８Ｌ，１８Ｒと平行させると
共に左右のベアリング３８，４１を介しミツシヨ
ンケース５に支持させて設けて、ミツシヨンケー
ス５の外面上に形成した環状のブレーキ室４５内
で上記伝動軸１７に配して、該伝動軸１７を選択
的に制動するためのブレーキ３１を設けてある、
自走式作業車のトランスミツシヨン装置であつ
て、前記したミツシヨン出力軸１８Ｌ，１８Ｒ及
び伝動軸１７に対し直交する第１及び第２の分割
面P₁，P₂に沿つてミツシヨンケース５を、第１，
第２及び第３のケース部５Ａ，５Ｂ，５Ｃに分割
し、第１の分割面P₁側の端面を開放した第１の
ケース部５Ａには、一側のミツシヨン出力軸１８
Ｌと前記伝動軸１７の一端部と前記差動装置２５
のデフケース２６の一端部とをそれぞれ支持させ
ると共に前記差動装置２５を内装させ、また第１
及び第２の分割面P₁，P₂上に位置する左右の端
面を開放した第２のケース部５Ｂには、該第２の
ケース部５Ｂの内面上に突設した支壁部４０によ
り前記伝動軸１７の他端部と前記デフケース２６
の他端部とを支持させ、さらに第２の分割面P₂
側の端面を開放した第３のケース部５Ｃには、他
側のミツシヨン出力軸１８Ｒを支持させ、また前
記ブレーキ室４５を、上記支壁部４０を内底壁と
し第２のケース部５Ｂと第３のケース部５Ｃとに
それぞれ設けた筒状部を左右方向で重合させ外周
壁として形成設置すると共に、該第２及び第３の
ケース部５Ｂ，５Ｃ内にまたがらせて前記デフロ
ツククラツチ３０を内装させて、該デフロツクク
ラツチ３０のデフヨーク４８を支持するデフヨー
ク軸４９を、第１のケース部５Ａと第３のケース
部５Ｃとに両端部で支持させて設けたことを特徴
とする構成を備え、前述の目的を達成した次のよ
うな効果を奏する。 As is clear from the above explanation of the embodiments, the transmission device for a self-propelled work vehicle of this invention has two transmission systems that transmit power from inside the transmission case 5 to the left and right wheels in one direction. The output shafts 18L and 18R are connected to the transmission case 5 between the left and right transmission output shafts 18L and 18R.
The left and right output shafts of the differential gear 25, which is disposed inside the vehicle and has a defroc clutch 30 attached thereto, are also configured, and these left and right transmission output shafts 18L, 1
8R is supported in the transmission case 5 via bearings 37 and 44 at the left and right ends of the transmission case 5, and a transmission shaft 17 that transmits input to the differential device 25 is placed inside the transmission case 5. The transmission shaft is installed parallel to the transmission output shafts 18L and 18R and supported by the transmission case 5 via left and right bearings 38 and 41, and is installed in an annular brake chamber 45 formed on the outer surface of the transmission case 5. A brake 31 for selectively braking the transmission shaft 17 is provided at the transmission shaft 17.
In the transmission device of a self-propelled work vehicle, the transmission case 5 is disposed along the first and second dividing planes P ₁ and P ₂ orthogonal to the transmission output shafts 18L and 18R and the transmission shaft 17. The first,
The first case part 5A is divided into second and third case parts 5A, 5B, and 5C, and the end face on the first dividing plane _P1 side is open.
L, one end of the transmission shaft 17, and the differential gear 25
one end of the differential case 26 of the first differential case 26 is supported, and the differential device 25 is installed inside the first differential case 26.
The second case part 5B with open left and right end faces located on the second dividing planes P ₁ and P ₂ has a supporting wall part 40 protruding from the inner surface of the second case part 5B. The other end of the transmission shaft 17 and the differential case 26
and the other end, and further the second dividing plane P ₂
The third case part 5C with an open end face supports the transmission output shaft 18R on the other side, and the brake chamber 45 is connected to the second case part 5B with the support wall part 40 as the inner bottom wall. The cylindrical portions provided in each of the third case portions 5C are overlapped with each other in the left and right direction to form an outer circumferential wall, and the differential clutch is fitted over the second and third case portions 5B and 5C. A differential yoke shaft 49 that supports a differential yoke 48 of the differential clutch clutch 30 is supported at both ends by the first case portion 5A and the third case portion 5C. The present invention achieves the above-mentioned purpose and has the following effects.

ミツシヨンケース５を３個といつた、比較的
個数が少ないケース部５Ａ，５Ｂ，５Ｃに分割
すると共に、第１のケース部５Ａ及び第３のケ
ース部５Ｃをそれぞれ、一端面を開放したもの
に形成していること、そして第２のケース部５
Ｂを、両端面を開放したものに形成すると共に
伝動軸１７及びデフケース２６の各他端部を支
持するための前記支壁部４０さえ設ければよい
ものとしていることから、ミツシヨンケース５
自体の鋳造成形と組立てが容易である。 The mission case 5 is divided into three case parts 5A, 5B, and 5C, which are relatively small in number, and the first case part 5A and the third case part 5C are each opened at one end. and the second case part 5.
B is formed with both end faces open, and all that is required is to provide the supporting wall portion 40 for supporting the other end portions of the transmission shaft 17 and the differential case 26. Therefore, the transmission case 5
Easy to cast and assemble.

第２のケース部５Ｂと第３のケース部５Ｃと
を一体に形成したとすると、伝動軸１７及びデ
フケース２６の各他端部を支持するための支壁
部を第１のケース部５Ａの内面上または一体化
された第２，第３のケース部５Ｂ，５Ｃの内面
上に設けねばならないから、そのような支壁部
に邪魔されてミツシヨンケース５内への伝動部
材の組込みが困難となるのに対し、第２のケー
ス部５Ｂと第３のケース部５Ｃとを分割形成し
ているから、先ず第３のケース部５Ｃを除いた
状態で第１のケース部５Ａと第２のケース部５
Ｂ間に、その間に設置する伝動部材を組込み、
ついで第２のケース部５Ｂと第３のケース部５
Ｃ間に、その間に設置する伝動部材を組込むよ
うに、伝動部材を組込みえて、ミツシヨンケー
ス５内への伝動部材の組込みが容易となる。 Assuming that the second case portion 5B and the third case portion 5C are integrally formed, a support wall portion for supporting the other ends of the transmission shaft 17 and the differential case 26 is formed on the inner surface of the first case portion 5A. Since the transmission member must be provided on the top or the inner surface of the integrated second and third case parts 5B and 5C, it is difficult to assemble the transmission member into the transmission case 5 because it is obstructed by such supporting walls. On the other hand, since the second case part 5B and the third case part 5C are formed separately, first, the first case part 5A and the second case part 5C are separated with the third case part 5C removed. Part 5
Incorporate the transmission member installed between B and
Then, the second case part 5B and the third case part 5
The transmission member can be installed between C and the transmission member installed therebetween, and the transmission member can be easily installed into the transmission case 5.

デフケース２６の一端部を第１のケース部５
Ａに支持させてある差動装置２５を、デフケー
ス２６の他端部を第２のケース部５Ｂに支持さ
せて第１のケース部５Ａに内装させてあるか
ら、差動装置２５他側の第２のケース部５Ｂ内
と第３のケース部５Ｃ内とにまたがつてミツシ
ヨンケース５内に開放空間部が形成されること
となり、そのような開放空間部が形成される位
置にデフロツククラツチ３０を設置しているこ
と、そしてデフヨーク軸４９を第２のケース部
５Ｂと第３のケース部５Ｃとにではなく第１の
ケース部５Ａと第３のケース部５Ｃとに支持さ
せているから、第２のケース部５Ｂの内面上に
デフヨーク軸５Ｂのための支壁部を設ける必要
がなく、ミツシヨンケース５内に第１のケース
部５Ａと第３のケース部５Ｃ内とにまたがつて
開放空間部が形成されることとなり、そのよう
な開放空間部が形成される位置にデフロツク操
作機構４８，４９を設置していること、よりし
てデフロツク機構の全体を、組込み容易である
と共にミツシヨンケース５内に無駄な空間部を
残さないように、設けてある。 One end of the differential case 26 is connected to the first case portion 5.
The differential gear 25 supported by the differential gear 25 is housed inside the first case part 5A with the other end of the differential case 26 supported by the second case part 5B. An open space is formed in the transmission case 5 spanning the second case part 5B and the third case part 5C, and the differential clutch is installed at the position where such an open space is formed. 30 is installed, and the differential yoke shaft 49 is supported not by the second case part 5B and third case part 5C but by the first case part 5A and third case part 5C. , there is no need to provide a supporting wall part for the differential yoke shaft 5B on the inner surface of the second case part 5B, and there is no need to provide a support wall part for the differential yoke shaft 5B on the inner surface of the second case part 5B, and there is no need to provide a support wall part for the differential yoke shaft 5B in the transmission case 5. As a result, an open space is formed, and the differential lock operating mechanisms 48 and 49 are installed at the position where such an open space is formed, which makes it easy to assemble the entire differential lock mechanism. It is provided so that no unnecessary space is left inside the mission case 5.

ミツシヨンケース５の外面上に形成されるブ
レーキ室４５を、第２のケース部５Ｂにおける
第２の分割面P₂側端面が開放していることを
利用して第２のケース部５Ｂにおける前記支壁
部４０を内底壁とし第２のケース部５Ｂと第３
のケース部５Ｃとにそれぞれ設けた筒状部を左
右方向で重合させ外周壁として、第２及び第３
のケース部５Ｂ，５Ｃの両者でもつて形成して
いるから、そのようなブレーキ室を第３のケー
ス部５Ｃのみでもつて形成する場合と対比し
て、第２のケース部５Ｂ内に無駄な空間部を残
さない。 The brake chamber 45 formed on the outer surface of the transmission case 5 is connected to the brake chamber 45 formed on the outer surface of the transmission case 5 by utilizing the fact that the second dividing surface P2 _side end surface of the second case section 5B is open. The supporting wall portion 40 is used as an inner bottom wall, and the second case portion 5B and the third
The cylindrical parts provided in the case part 5C are overlapped in the left and right direction to form the second and third outer peripheral walls.
Because the brake chamber is formed by both case parts 5B and 5C, there is no wasted space in the second case part 5B, compared to a case where such a brake chamber is formed by only the third case part 5C. Leave no part behind.

伝動軸１７端のブレーキ３０とミツシヨン出
力軸１８Ｒ上のデフロツク機構とは、第１のケ
ース部５Ａに内装された差動装置２５の側方で
第２，第３のケース部５Ｂ，５Ｃにまたがつ
て、互に並列的に配置された関係となるから、
逆に第２，第３のケース部５Ｂ，５Ｃを合せた
横巾が短縮され、この側のミツシヨン出力軸１
８Ｒ、つまり第１のケース部５Ａ内の差動装置
２５から延出する出力軸１８Ｒが、長尺化する
こともない。 The brake 30 at the end of the transmission shaft 17 and the differential lock mechanism on the transmission output shaft 18R are connected to the second and third case parts 5B and 5C on the side of the differential gear 25 housed in the first case part 5A. As a result, they are arranged in parallel with each other, so
Conversely, the combined width of the second and third case parts 5B and 5C is shortened, and the transmission output shaft 1 on this side is shortened.
8R, that is, the output shaft 18R extending from the differential device 25 in the first case portion 5A does not become elongated.

[Brief explanation of the drawing]

第１図はこの考案の一実施例を装備した自走式
作業車の模式的側面図、第２図は同作業車におけ
る伝動機構を示す機構図、第３図は同作業車要部
の一部展開横断平面図、第４図は第３図の−
線に沿う一部縦断側面図である。１…後輪、５…ミツシヨンケース、５Ａ…第１
のケース部、５Ｂ…第２のケース部、５Ｃ…第３
のケース部、１４…ミツシヨン入力軸、１７…伝
動軸、１８Ｌ，１８Ｒ…ミツシヨン出力軸、２５
…差動装置、２６…デフケース、２７…大歯車、
２８…小歯車、２９…クラツチ金物、３０…デフ
ロツククラツチ、３０ａ，３０ｂ…爪、３１…ブ
レーキ、３１ａ…ブレーキドラム、３１ｂ…ブレ
ーキバンド、３１ｃ…カム軸、３７，３８，３９
…ボールベアリング、４０…支壁部、４１，４２
…ボールベアリング、４４…ボールベアリング、
４５…ブレーキ室、４５ａ…蓋板、４８…デフヨ
ーク、４９…デフヨーク軸、５３…ねじボルト、
P₁…第１の分割面、P₂…第２の分割面、P₃…第
３の分割面。 Figure 1 is a schematic side view of a self-propelled working vehicle equipped with an embodiment of this invention, Figure 2 is a mechanical diagram showing the transmission mechanism of the working vehicle, and Figure 3 is a schematic diagram of the main parts of the working vehicle. Partial development cross-sectional plan view, Fig. 4 is the − of Fig. 3.
FIG. 3 is a partially longitudinal side view taken along a line. 1... Rear wheel, 5... Mission case, 5A... 1st
case part, 5B...second case part, 5C...third case part
case part, 14...Mission input shaft, 17...Transmission shaft, 18L, 18R...Mission output shaft, 25
...differential gear, 26...differential case, 27...large gear,
28... Small gear, 29... Clutch hardware, 30... Defrot clutch, 30a, 30b... Pawl, 31... Brake, 31a... Brake drum, 31b... Brake band, 31c... Camshaft, 37, 38, 39
...Ball bearing, 40...Support wall, 41, 42
...Ball bearing, 44...Ball bearing,
45... Brake chamber, 45a... Cover plate, 48... Differential yoke, 49... Differential yoke shaft, 53... Screw bolt,
P ₁ ... first dividing surface, P ₂ ... second dividing surface, P ₃ ... third dividing surface.

Claims

[Scope of utility model registration request]

Left and right transmission output shafts 18L, 1 transmit power from inside the transmission case 5 to the left and right wheels in one direction.
8R to the left and right transmission output shafts 18L, 18
The left and right output shafts of the differential device 25, which is disposed in the transmission case 5 and equipped with a differential clutch 30, are connected between the left and right transmission shafts 18L and 18R between the transmission case 5 and the transmission case 5. 5, a transmission shaft 17 which is supported via bearings 37 and 44 at the left and right ends of the transmission case 5 and which transmits input to the differential device 25 is installed in the transmission case 5, and the transmission output shaft 18 is mounted inside the transmission case 5.
L, 18R, and supported by the transmission case 5 via left and right bearings 38, 41, and disposed on the transmission shaft 17 within an annular brake chamber 45 formed on the outer surface of the transmission case 5. A transmission device for a self-propelled working vehicle is provided with a brake 31 for selectively braking the transmission shaft 17, and is orthogonal to the transmission output shafts 18L, 18R and the transmission shaft 17. The mission case 5 is divided into first, second, and third case parts 5A, 5B, and 5C along _the first and second dividing planes P 1 and P ₂ , and the first dividing plane P ₁
The first case portion 5A, which has an open side end surface, supports the transmission output shaft 18L on one side, one end of the transmission shaft 17, and one end of the differential case 26 of the differential device 25, and The moving device 25 is installed inside, and the first and second dividing planes P ₁ ,
The second case part 5B located on P ₂ with open left and right end faces is connected to the other end of the transmission shaft 17 by a supporting wall part 40 protruding from the inner surface of the second case part 5B. The third case part 5C, which supports the other end of the differential case 26 and has an open end face on the second dividing plane _P2 side, supports the transmission output shaft 18R on the other side, and also supports the brake chamber 45.
The supporting wall portion 40 is used as an inner bottom wall, and the cylindrical portions provided in the second case portion 5B and the third case portion 5C are overlapped in the left and right direction to form an outer peripheral wall, and the second case portion 40 is formed as an outer peripheral wall. and third case part 5B, 5
C and the differential lock clutch 30.
The differential yoke shaft 49 that supports the differential yoke 48 of the differential lock clutch 30 is inserted into the first
A transmission device characterized in that it is supported at both ends by a case portion 5A and a third case portion 5C.