JPS621483Y2 - - Google Patents

Description

【考案の詳細な説明】 本考案は、農用トラクタのパワートランスミツ
シヨン構造に関し、その目的は、簡単な改造で組
付、分解作業の容易化を図る点にある。[Detailed Description of the Invention] The present invention relates to a power transmission structure for an agricultural tractor, and its purpose is to facilitate assembly and disassembly work through simple modification.

さらに詳述すると、この種のパワートランスミ
ツシヨン構造では、機枠兼用のケースの内部に、
入力軸及びその両側に振分配置された一対の変速
用操作軸を互いに平行状に並置し、前記両変速用
操作軸の夫々に、変速用シリンダに連通する油路
を形成し、ケース外に位置するコントロールバル
ブと前記各油路とを接続することになるが、従来
では、前記油路接続をパイプを用いて行なうよう
にしていたため、このパイプの組付、分解作業が
煩わしく、全体の組付、分解作業が行ない難い問
題があり、このような問題を解決しようとするも
のである。 To explain in more detail, in this type of power transmission structure, inside the case that also serves as the machine frame,
An input shaft and a pair of shift operation shafts distributed on both sides of the input shaft are arranged parallel to each other, and an oil passage communicating with the shift cylinder is formed in each of the two shift operation shafts, and an oil passage is formed outside the case. The control valve located at the location is connected to each of the oil passages, but in the past, the oil passage connections were made using pipes, which made assembly and disassembly of the pipes troublesome and made the entire assembly difficult. There is a problem in that it is difficult to attach and disassemble the product, and this is an attempt to solve this problem.

以下本考案の実施例を図面に基づいて詳述す
る。 Embodiments of the present invention will be described in detail below based on the drawings.

第１図に示すように、前部エンジン１、クラツ
チハウジング２、後部伝動ケース３を接続して機
体前後方向に沿う機枠を構成し、前記エンジン１
の下部に、向き変更操作可能な左右一対の前輪
４，４を支承し、前記伝動ケース３の両横側部
に、駆動回転可能な左右一対の後輪５，５を支承
し、更に、前記伝動ケース３の後壁に、PTO軸
６を突設し、もつて、機体後部に連結される耕耘
装置等の作業装置を前記PTO軸６の出力にて駆
動しながら進行に伴い作業を行なえるように構成
してある。 As shown in FIG. 1, a front engine 1, a clutch housing 2, and a rear transmission case 3 are connected to form a machine frame along the longitudinal direction of the aircraft.
A pair of left and right front wheels 4, 4 that can be operated to change direction are supported at the lower part of the transmission case 3, a pair of left and right rear wheels 5, 5 that can be driven and rotated are supported on both lateral sides of the transmission case 3, and A PTO shaft 6 is provided protruding from the rear wall of the transmission case 3, and the output of the PTO shaft 6 drives a working device such as a tiller connected to the rear of the machine body to perform work as the machine advances. It is structured as follows.

第２図に示すように、前記エンジン１のフライ
ホイール７と前記伝動ケース３の入力軸８との間
に、ペダル１０（第１図参照）にて切り操作可能
な摩擦伝動板式の入り付勢の伝動クラツチ９を設
け、もつて、前記後輪５，５及び前記PTO軸６
の駆動を一挙に断続操作できるように構成してあ
る。 As shown in FIG. 2, a friction transmission plate-type biasing device is provided between the flywheel 7 of the engine 1 and the input shaft 8 of the transmission case 3, which can be operated by a pedal 10 (see FIG. 1). A transmission clutch 9 is provided, which connects the rear wheels 5, 5 and the PTO shaft 6.
The structure is such that the drive can be turned on and off all at once.

前記の如くクラツチハウジング２と伝動ケース
３とを連結して構成される機枠兼用のケースの内
部に、入力軸８及びそれの上下両側に振分配置さ
れた一対の変速用操作軸１１ａ，１１ｂを互いに
平行状に並置支承し、前記入力軸８の後端に固着
した出力ギヤ８ａと前記両変速用操作軸１１ａ，
１１ｂ夫々の前端に固着した入力ギヤ１４ａ，１
４ｂとを咬合させるとともに、走行系伝動軸１２
の前端に固着した受動ギヤ１２ａを、前記上方操
作軸１１ａに遊転支承した後進用伝動ギヤ１３ａ
に中間ギヤ２０を介して連動連結し、前記受動ギ
ヤ１２ａを、前記下方操作軸１１ｂに遊転支承し
た前進用伝動ギヤ１３ｂに咬合させ、更に、前記
両入力ギヤ１４ａ，１４ｂの夫々とこれに対応す
る前記伝動ギヤ１３ａ，１３ｂとの間に、後述の
如く油圧力にて入り操作される切り付勢の摩擦伝
動板式の後進伝動クラツチ１５ａ及び前進伝動ク
ラツチ１５ｂを設け、もつて、両クラツチ１５
ａ，１５ｂを択一的に入り操作させることによ
り、機体を後進状態と前進状態とで走行させるこ
とができるように構成してある。尚、前記下方操
作軸１１ｂは、前記PTO軸６と連動連結する
PTO系伝動軸に兼用構成してある。 As described above, inside the case that also serves as a machine frame, which is constructed by connecting the clutch housing 2 and the transmission case 3, there is an input shaft 8 and a pair of shift operation shafts 11a and 11b distributed above and below the input shaft 8. are supported in parallel to each other, and are fixed to the rear end of the input shaft 8.
Input gears 14a, 1 fixed to the front end of each of 11b
4b, and the traveling system transmission shaft 12.
a reverse transmission gear 13a in which a passive gear 12a fixed to the front end of the drive gear 12a is rotatably supported on the upper operating shaft 11a;
The passive gear 12a is interlocked with the forward transmission gear 13b which is rotatably supported on the lower operation shaft 11b, and is connected to each of the input gears 14a and 14b. Between the corresponding transmission gears 13a and 13b, there are provided a friction transmission plate type reverse transmission clutch 15a and a forward transmission clutch 15b, which are engaged and operated by hydraulic pressure as described later.
By selectively engaging the levers a and 15b, the aircraft is configured to be able to run in a backward state and a forward state. Note that the lower operation shaft 11b is interlocked and connected to the PTO shaft 6.
It is configured to double as a PTO system transmission shaft.

前記両操作軸１１ａ，１１ｂ夫々に外嵌したピ
ストン１６ａ，１６ｂと前記入力ギヤ１４ａ，１
４ｂの夫々に一体形成するシリンダ１７ａ，１７
ｂとから、前記両クラツチ１５ａ，１５ｂを択一
的に入り操作して前後進切換を行なう一対の変速
用油圧シリンダを構成し、前記両操作軸１１ａ，
１１ｂの夫々に、前記両油圧シリンダ１６ａ，１
７ａ，１６ｂ，１７ｂに連通するシリンダ操作用
油路１８ａ，１８ｂ、及び前記両クラツチ１５
ａ，１５ｂに潤滑油を供給するための油路１９
ａ，１９ｂを形成し、前記入力軸８を挿通させる
孔２１が形成された前記両変速用操作軸１１ａ，
１１ｂのクラツチがわ端部に対するカバー２２の
上部に、ケース外に位置する状態でケースに組付
けられるコントロールバルブ２３に連結の油路付
きブラケツト２４をボルト連結してある。 Pistons 16a, 16b fitted onto the operating shafts 11a, 11b, respectively, and the input gears 14a, 1
cylinders 17a, 17 integrally formed with each of the cylinders 4b;
A pair of hydraulic cylinders for shifting are configured from the clutches 15a and 15b to selectively engage and operate the clutches 15a and 15b to switch forward and backward movement, and the operating shafts 11a and 15b
11b, both the hydraulic cylinders 16a, 1
Cylinder operation oil passages 18a, 18b communicating with 7a, 16b, 17b, and both clutches 15
Oil passage 19 for supplying lubricating oil to a and 15b
a, 19b, and a hole 21 through which the input shaft 8 is inserted is formed.
A bracket 24 with an oil passage connected to a control valve 23 assembled to the case while being located outside the case is bolted to the upper part of the cover 22 for the end of the clutch 11b.

そして、前記カバー２２は、変速用操作軸１１
ａ，１１ｂの軸端に各別に装着されるキヤツプ部
材２２ａ，２２ｂと、それらキヤツプ部材２２
ａ，２２ｂをケース２がわに押圧すべくケース２
にボルト連結される押圧部材２２ｃとから形成し
てあり、入力軸８を挿通させる孔２１を形成して
ある押圧部材２２ｃに、これを前記クラツチハウ
ジング２の後壁２ａに対して着脱可能にボルト止
着させた状態において、前記後壁２ａ並びにキヤ
ツプ部材２２ａ，２２ｂとの間に前記バルブ２３
とキヤツプ部材２２ａ，２２ｂに形成してある前
記シリンダ操作用油路１８ａ，１８ｂに連通する
油路及び前記潤滑油供給油路１９ａ，１９ｂに連
通する油路とを接続するための油路２５ａ，２５
ｂ，２５ｃを形成すべく凹溝Ua，Ub，Ucを形成
するとともに、前記油路２５ａ，２５ｂ，２５ｃ
と前記ブラケツト２４に形成の油路２６ａ，２６
ｂ，２６ｃとを連通させる接続油路２７ａ，２７
ｂ，２７ｃを形成してある。 The cover 22 is attached to the shift operation shaft 11.
The cap members 22a and 22b are attached to the shaft ends of the shafts a and 11b separately, and the cap members 22
case 2 to press a and 22b against case 2.
The press member 22c has a hole 21 through which the input shaft 8 is inserted, and the press member 22c is detachably bolted to the rear wall 2a of the clutch housing 2. In the fixed state, the valve 23 is disposed between the rear wall 2a and the cap members 22a and 22b.
and an oil passage 25a for connecting the oil passages formed in the cap members 22a, 22b and communicating with the cylinder operating oil passages 18a, 18b and the oil passages communicating with the lubricating oil supply oil passages 19a, 19b, 25
Concave grooves Ua, Ub, Uc are formed to form the oil passages 25a, 25b, 25c.
and oil passages 26a, 26 formed in the bracket 24.
Connection oil passages 27a and 27 that communicate with b and 26c
b, 27c are formed.

そして、前記伝動ケース３内に潤滑油を兼ねて
貯留された作動油を前記バルブ２３に圧送し、も
つて、前記バルブ２３の切換操作により、前記両
伝動クラツチ１５ａ，１５ｂをともに切りにする
状態、前進用伝動クラツチ１５ｂを入りにする状
態、及び前記後進用伝導クラツチ１５ａを入りに
する状態とに切換えるべく構成し、且つ、バルブ
２３に圧送されてくる油の一部を前記両クラツチ
１５ａ，１５ｂに潤滑油として供給するように構
成してある。 Then, the hydraulic oil stored in the transmission case 3 that also serves as lubricating oil is fed to the valve 23, and by switching the valve 23, both the transmission clutches 15a and 15b are disengaged. , and is configured to switch the forward transmission clutch 15b into an engaged state and the reverse transmission clutch 15a into an engaged state, and a portion of the oil pressured to the valve 23 is transferred to both the clutches 15a, 15b as lubricating oil.

尚、前記カバー２２とケース２，３との間に油
路２５ａ，２５ｂを形成する手段としては、例え
ば実施例における後壁２ａに凹溝を形成したり、
油路付きパツキンを挟み込ませるようにする等、
種々の形態が考えられるものである。 The means for forming the oil passages 25a and 25b between the cover 22 and the cases 2 and 3 include, for example, forming grooves in the rear wall 2a in the embodiment,
For example, by inserting a gasket with an oil passage, etc.
Various forms are possible.

又、本考案は、走行速度設定等、種々の目的の
変速に利用できるものである。 Further, the present invention can be used for changing speeds for various purposes such as setting the traveling speed.

以上要するに本考案による農用トラクタのパワ
ートランスミツシヨン構造は、入力軸８の両側に
振分配置された一対の変速用操作軸１１ａ，１１
ｂの夫々に、変速用油圧シリンダ１６ａ，１７
ａ，１６ｂ，１７ｂに連通する油路１８ａ，１８
ｂを形成し、前記両変速用操作軸１１ａ，１１ｂ
の一端側と前記入力軸８の一端側とを互いに逆方
向に機枠兼用のケース２，３内に設けてある壁体
２ａから突出させて、この壁体２ａに互いに平行
状に軸支するとともに、前記油路１８ａ，１８ｂ
に連通する油路を形成してあるキヤツプ部材２２
ａ，２２ｂを前記両変速用操作軸１１ａ，１１ｂ
の壁体２ａからの突出端に各別に装着し、更に、
入力軸８を挿通させる孔２１を形成してある押圧
部材２２ｃを壁体２ａと両キヤツプ部材２２ａ，
２２ｂとに亘つて当て付けて壁体２ａに固定し、
前記押圧部材２２ｃと、壁体２ａ並びに両キヤツ
プ部材２２ａ，２２ｂとの当て付け面に、キヤツ
プ部材２２ａ，２２ｂに形成してある油路と前記
ケース２，３外に位置するコントロールバルブ２
３とを接続する油路２５ａ，２５ｂを形成してあ
ることを特徴とするものであるから、以下の作用
効果を奏する。 In summary, the power transmission structure of the agricultural tractor according to the present invention includes a pair of speed change operation shafts 11a and 11 distributed on both sides of the input shaft 8.
transmission hydraulic cylinders 16a and 17, respectively.
Oil passages 18a, 18 communicating with a, 16b, 17b
b, and the two speed change operation shafts 11a, 11b
One end side and one end side of the input shaft 8 are made to protrude in opposite directions from a wall 2a provided in the cases 2 and 3 which also serve as machine frames, and are supported parallel to each other on this wall 2a. In addition, the oil passages 18a and 18b
A cap member 22 forming an oil passage communicating with the cap member 22
a, 22b are the operating shafts 11a, 11b for both speed changes.
are attached to each protruding end from the wall body 2a, and further,
A pressing member 22c having a hole 21 through which the input shaft 8 is inserted is connected to the wall 2a and both cap members 22a,
22b and fixed to the wall 2a,
Oil passages formed in the cap members 22a, 22b and a control valve 2 located outside the cases 2, 3 are provided on the abutting surfaces of the pressing member 22c, the wall 2a, and both cap members 22a, 22b.
Since the oil passages 25a and 25b are formed to connect the oil passages 3 and 3, the following effects are achieved.

即ち、両変速用操作軸１１ａ，１１ｂを油路形
成部材としてのキヤツプ部材２２ａ，２２ｂ並び
に押圧部材２２ｃに軸支させるのではなく、壁体
２ａに軸支させるものであるから、油路２５ａ，
２５ｂの接続、分解作業を変速用操作軸１１ａ，
１１ｂの組付、分解作業とは別個に行うことがで
き、しかも、両変速用操作軸１１ａ，１１ｂの壁
体２ａからの突出端に各別にキヤツプ部材２２
ａ，２２ｂを装着し、このキヤツプ部材２２ａ，
２２ｂと壁体２ａとに亘つて１個の押圧部材２２
ｃを当て付けて、両変速用操作軸１１ａ，１１ｂ
の夫々に形成した油路１８ａ，１８ｂと、ケース
外に位置するコントロールバルブ２３とを接続す
る油路２５ａ，２５ｂを形成するものであるか
ら、容易な作業で所望の油路接続作業を完了でき
るものであり、バルブ２３と油路１８ａ，１８ｂ
とをパイプを介して接続する従来構造における冒
記問題を解消し、全体の組付、分解作業を容易に
行なうことができるのである。しかも、本案によ
れば、上記の如く、押圧部材２２ｃと壁体２ａ並
びにキヤツプ部材２２ａ，２２ｂとの間に接続用
油路２５ａ，２５ｂを形成して所望の目的に達す
るものであるから、接続用油路２５ａ，２５ｂを
形成するための加工が容易であり、全体構造の低
廉化を図ることができるものである。更に詳述す
ると、本案と同様の目的に達する別手段として、
押圧部材２２ｃとキヤツプ部材２２ａ，２２ｂと
を一体に形成したカバー２２又はケース２，３に
接続用油路２５ａ，２５ｂを孔加工する手段が考
えられるが、この場合、入力軸８を迂回させる状
態で油路２５ａ，２５ｂを形成しなければならな
い必要上、孔加工が複雑で高価につくきらいがあ
る。 That is, since the operating shafts 11a, 11b for both speed changes are not supported by the cap members 22a, 22b and the pressing member 22c as oil path forming members, but are supported by the wall 2a, the oil paths 25a,
The connection and disassembly work of 25b is carried out using the gearshift operation shaft 11a,
11b can be assembled and disassembled separately, and cap members 22 are installed separately on the ends of both transmission operation shafts 11a and 11b protruding from the wall 2a.
a, 22b, and attach the cap members 22a, 22b.
One pressing member 22 extends between 22b and wall 2a.
c, and both shift operation shafts 11a, 11b.
Since the oil passages 25a and 25b are formed to connect the oil passages 18a and 18b formed respectively in the case and the control valve 23 located outside the case, the desired oil passage connection work can be easily completed. The valve 23 and the oil passages 18a, 18b
This solves the problem mentioned above in the conventional structure in which the parts are connected via a pipe, and the entire assembly and disassembly work can be easily performed. Moreover, according to the present invention, as described above, the connection oil passages 25a, 25b are formed between the pressing member 22c, the wall 2a, and the cap members 22a, 22b to achieve the desired purpose. Processing for forming the oil passages 25a and 25b is easy, and the overall structure can be made at low cost. To elaborate further, as an alternative means to achieve the same purpose as the main proposal,
A conceivable method is to drill connection oil passages 25a, 25b in the cover 22 or cases 2, 3 in which the pressing member 22c and the cap members 22a, 22b are integrally formed, but in this case, the input shaft 8 is detoured. Since the oil passages 25a and 25b have to be formed, hole machining is complicated and tends to be expensive.

【図面の簡単な説明】[Brief explanation of the drawing]

図面は本考案に係る農用トラクタのパワートラ
ンスミツシヨン構造の実施例を示し、第１図は農
用トラクタの側面図、第２図はカバー装着部の縦
断面図、第３図は同部の正面図、第４図は第３図
における−線断面図、第５図は第３図におけ
る−線断面図である。 ２，３……ケース、８……入力軸、１１ａ，１
１ｂ……変速用操作軸、１６ａ，１７ａ，１６
ｂ，１７ｂ……変速用油圧シリンダ、１８ａ，１
８ｂ……油路、２１……孔、２ａ……壁体、２２
ａ，２２ｂ……キヤツプ部材、２２ｃ……押圧部
材、２３……コントロールバルブ、２５ａ，２５
ｂ……油路、Ua，Ub……凹溝。 The drawings show an embodiment of the power transmission structure for an agricultural tractor according to the present invention, in which Fig. 1 is a side view of the agricultural tractor, Fig. 2 is a longitudinal cross-sectional view of the cover attachment part, and Fig. 3 is a front view of the same part. 4 is a cross-sectional view taken along the line -- in FIG. 3, and FIG. 5 is a cross-sectional view taken along the line -- in FIG. 3. 2, 3... Case, 8... Input shaft, 11a, 1
1b... Speed change operation shaft, 16a, 17a, 16
b, 17b... Hydraulic cylinder for speed change, 18a, 1
8b...oil passage, 21...hole, 2a...wall, 22
a, 22b... Cap member, 22c... Pressing member, 23... Control valve, 25a, 25
b...Oil passage, Ua, Ub...concave groove.

Claims (1)

【実用新案登録請求の範囲】 入力軸８の両側に振分配置された一対の変速
用操作軸１１ａ，１１ｂの夫々に、変速用油圧
シリンダ１６ａ，１７ａ，１６ｂ，１７ｂに連
通する油路１８ａ，１８ｂを形成し、前記両変
速用操作軸１１ａ，１１ｂの一端側と前記入力
軸８の一端側とを互いに逆方向に機枠兼用のケ
ース２，３内に設けてある壁体２ａから突出さ
せて、この壁体２ａに互いに平行状に軸支する
とともに、前記油路１８ａ，１８ｂに連通する
油路を形成してあるキヤツプ部材２２ａ，２２
ｂを前記両変速用操作軸１１ａ，１１ｂの壁体
２ａからの突出端に各別に装着し、更に、入力
軸８を挿通させる孔２１を形成してある押圧部
材２２ｃを壁体２ａと両キヤツプ部材２２ａ，
２２ｂとに亘つて当て付けて壁体２ａに固定
し、前記押圧部材２２ｃと、壁体２ａ並びに両
キヤツプ部材２２ａ，２２ｂとの当て付け面
に、キヤツプ部材２２ａ，２２ｂに形成してあ
る油路と前記ケース２，３外に位置するコント
ロールバルブ２３とを接続する油路２５ａ，２
５ｂを形成してある農用トラクタのパワートラ
ンスミツシヨン構造。 前記押圧部材２２ｃに、前記油路２５ａ，２
５ｂ形成のための凹溝Ua，Ubを形成してある
実用新案登録請求の範囲第項に記載の農用ト
ラクタのパワートランスミツシヨン構造。 前記壁体２ａに、前記油路２５ａ，２５ｂ形
成のための凹溝を形成してある実用新案登録請
求の範囲第項に記載の農用トラクタのパワー
トランスミツシヨン構造。[Claims for Utility Model Registration] A pair of shift operation shafts 11a and 11b distributed on both sides of the input shaft 8 are provided with oil passages 18a, which communicate with shift hydraulic cylinders 16a, 17a, 16b, and 17b, respectively. 18b, and one end side of the two speed change operating shafts 11a, 11b and one end side of the input shaft 8 are made to protrude in opposite directions from a wall 2a provided in the cases 2, 3 which also serve as machine frames. Cap members 22a and 22 are supported on the wall 2a in parallel with each other and form oil passages communicating with the oil passages 18a and 18b.
b are respectively attached to the protruding ends of the wall 2a of both the speed change operating shafts 11a and 11b, and a pressing member 22c having a hole 21 through which the input shaft 8 is inserted is attached to the wall 2a and both caps. member 22a,
22b and is fixed to the wall 2a, and an oil passage is formed in the cap members 22a, 22b on the abutment surface between the pressing member 22c, the wall 2a, and both cap members 22a, 22b. and the control valve 23 located outside the cases 2 and 3.
5b is a power transmission structure of an agricultural tractor. The oil passages 25a, 2 are connected to the pressing member 22c.
A power transmission structure for an agricultural tractor according to claim 1, wherein grooves Ua and Ub for forming grooves 5b are formed. A power transmission structure for an agricultural tractor according to claim 1, wherein the wall body 2a is provided with grooves for forming the oil passages 25a and 25b.