JPH04201603A - Vehicle wheel distance adjustment device - Google Patents
Vehicle wheel distance adjustment deviceInfo
- Publication number
- JPH04201603A JPH04201603A JP33600290A JP33600290A JPH04201603A JP H04201603 A JPH04201603 A JP H04201603A JP 33600290 A JP33600290 A JP 33600290A JP 33600290 A JP33600290 A JP 33600290A JP H04201603 A JPH04201603 A JP H04201603A
- Authority
- JP
- Japan
- Prior art keywords
- port
- ports
- control valve
- double
- acting hydraulic
- 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.)
- Granted
Links
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、トラクタ等の車輌の軸距調整装置に関する。[Detailed description of the invention] (Industrial application field) The present invention relates to a wheelbase distance adjustment device for a vehicle such as a tractor.
（従来の技術）
トラクタ等の車輌の輪距調整装置として、例えば、特願
昭６２−１３６５５０号明細書及び図面に記載のものが
公知である。(Prior Art) As a wheel distance adjustment device for a vehicle such as a tractor, for example, the device described in Japanese Patent Application No. 136550/1982 and the drawings is known.
前記従来の軸距調整装置は、左右一対の伸縮自在な車軸
と、該車軸を伸縮させる左右一対の複動油圧シリンダと
、該複動油圧シリンダを制御する制御弁装置とを有して
なるものであった。The conventional wheelbase adjustment device has a pair of left and right telescopic axles, a pair of left and right double-acting hydraulic cylinders that extend and retract the axles, and a control valve device that controls the double-acting hydraulic cylinders. Met.
前記制御弁装置は、各複動油圧シリンダに対応して設け
られた制御弁からなり、各制御弁を個々に操作すること
により、右側又は左側の車軸の長さが独立して調整され
るものであった。The control valve device consists of a control valve provided corresponding to each double-acting hydraulic cylinder, and by individually operating each control valve, the length of the right or left axle is adjusted independently. Met.
（発明が解決しようとする課題）
車輌の輪距調整においては、右側の車軸または左側の車
軸を個別に調整したい場合と、同一に調整したい場合と
がある。(Problem to be Solved by the Invention) When adjusting the wheel width of a vehicle, there are cases where it is desired to adjust the right axle or the left axle individually, and cases where it is desired to adjust them equally.
しかし、前記従来の軸距調整装置においては、右側の車
軸または左側の車軸を個別にしか調整することができず
、左右の車軸を同時に調整することが出来なかった。However, in the conventional wheelbase distance adjusting device, it is only possible to adjust the right axle or the left axle individually, and it is not possible to adjust the left and right axles simultaneously.
そこで、本発明は、構造簡単な制御弁装置により、左右
の車軸を個別に調整し、また同時に調整することができ
る車輌の軸距調整装置を提供することを目的とする゛。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a vehicle wheelbase distance adjustment device that can adjust the left and right axles individually and simultaneously using a control valve device with a simple structure.
（課題を解決するための手段）
前記目的を達成するため、本発明は、次の手段を講じた
。即ち、本発明の特徴とする処は、車体の左右両側に、
伸縮自在な車軸と、該車軸を伸縮させる複動油圧シリン
ダが設けられ、
前記複動油圧シリンダを制御する制御弁装置が設けられ
た車輌の輪距調整装置において、前記制御弁装置は、２
位置６ポートの制御弁と、開閉弁とから成り、
前記制御弁は、ポンプ側にＡポートとＢポートとを有し
、シリンダ側に第１乃至第４ポートを有し、第１の位置
において、Ａポートと第１及び第２ポートが連通し、か
つ、Ｂポートと第３及び第４ポートが連通し、第２の位
置において、全ポートが閉じられるよう構成されており
、
前記第１及び第２ポートは、前記左右一対の複動油圧シ
リンダの各ロフト側油室に連通し、第３及び第４ポート
は、同シリンダの各ヘッド側油室に連通し、
前記開閉弁は、前記第１及び第２ポートと各シリンダの
ロフト側油室とを結ぶ各油路の途中に設けられている点
にある。(Means for Solving the Problems) In order to achieve the above object, the present invention takes the following measures. That is, the feature of the present invention is that on both the left and right sides of the vehicle body,
A wheel length adjustment device for a vehicle that is provided with a telescoping axle and a double-acting hydraulic cylinder that extends and retracts the axle, and a control valve device that controls the double-acting hydraulic cylinder, the control valve device comprising:
It consists of a control valve with 6 ports and an on-off valve, and the control valve has an A port and a B port on the pump side, 1st to 4th ports on the cylinder side, and has 6 ports in the 1st position. , the A port communicates with the first and second ports, and the B port communicates with the third and fourth ports, and all ports are closed in the second position, and the first and second ports communicate with each other. The second port communicates with each loft-side oil chamber of the pair of left and right double-acting hydraulic cylinders, the third and fourth ports communicate with each head-side oil chamber of the same cylinder, and the on-off valve communicates with the loft-side oil chamber of the pair of left and right double-acting hydraulic cylinders. It is provided in the middle of each oil passage connecting the first and second ports and the loft side oil chamber of each cylinder.
（作 用）
本発明によれば、制御弁が第２の位置をしめるとき、全
ポートが閉じられるので、左右の複動油圧シリンダは油
圧ロックされ、車軸の長さは固定される。(Function) According to the present invention, when the control valve closes to the second position, all ports are closed, so the left and right double-acting hydraulic cylinders are hydraulically locked, and the length of the axle is fixed.
制御弁を第１の位置にすると、Ａポートと第１・２ポー
トが連通し、Ｂポートと第３・４ポートが連通する。When the control valve is placed in the first position, the A port communicates with the first and second ports, and the B port communicates with the third and fourth ports.
今、この状態において、左右一対の開閉弁を開き、かつ
、Ａポートにポンプからの作動油を供給し、Ｂポートを
戻り回路に接続すると、作動油は、Ａポートから第１・
２ポート及び開閉弁を通って、各複動油圧シリンダのロ
フト側油室に入り、ヘッド側油室の油は、第３・４ポー
ト及びＢポートを通ってタンクに戻され、両方の複動油
圧シリンダが同時操作される。両方の車軸の長さが同時
に調整される。Now, in this state, if you open the pair of left and right on-off valves, supply hydraulic oil from the pump to the A port, and connect the B port to the return circuit, the hydraulic oil will flow from the A port to the first
The oil in the loft side oil chamber of each double-acting hydraulic cylinder enters the loft side oil chamber of each double-acting hydraulic cylinder through the 2nd port and the on-off valve, and the oil in the head side oil chamber is returned to the tank through the 3rd and 4th ports and the B port, Hydraulic cylinders are operated simultaneously. Both axle lengths are adjusted simultaneously.
前記状態において、一方の開閉弁を閉じると、該閉じら
れた側の複動油圧シリンダには作動油が供給されないの
で、片側の複動油圧シリンダのみが作動し、片方のみの
車軸の長さが調整される。In the above state, when one on-off valve is closed, hydraulic oil is not supplied to the double-acting hydraulic cylinder on the closed side, so only the double-acting hydraulic cylinder on one side operates, and the length of the axle on only one side is reduced. be adjusted.
前記とは逆にＢポートにポンプからの作動油を供給し、
Ａポートを戻り回路とすると、複動油圧シリンダの動き
が前記とは逆になる。即ち、前記の場合、軸距が長くな
るのなら、この場合は軸距が短かくなる。Contrary to the above, supply hydraulic oil from the pump to port B,
If the A port is used as a return circuit, the movement of the double-acting hydraulic cylinder will be opposite to that described above. That is, in the above case, if the wheelbase distance becomes long, in this case the wheelbase distance becomes short.
（実施例） 以下、本発明の実施例を図面に基づき説明する。(Example) Embodiments of the present invention will be described below based on the drawings.
第５図に示すものは車輌の一例であるトラクタであり、
該トラクタは、エンジン１やミッションケース２を剛体
結合して車体３を構成し、該車体３は、前輪４及び後輪
５で支持されている。What is shown in Fig. 5 is a tractor, which is an example of a vehicle.
The tractor has an engine 1 and a transmission case 2 rigidly connected to form a vehicle body 3, and the vehicle body 3 is supported by front wheels 4 and rear wheels 5.
前記ミッションケース２の後部に作業機昇降用の油圧装
置６が載置され、該油圧装置６の上方に運転席７が配置
されている。A hydraulic device 6 for lifting and lowering the working machine is mounted at the rear of the mission case 2, and a driver's seat 7 is arranged above the hydraulic device 6.
前記エンジンｌの近傍に油圧ポンプ８が配置され、該油
圧ポンプ８はエンジンｌにより駆動され、ミッションケ
ース２内に貯留された作動油を前記油圧装置６等に供給
する。A hydraulic pump 8 is disposed near the engine 1, and is driven by the engine 1 to supply hydraulic fluid stored in the transmission case 2 to the hydraulic device 6 and the like.
前記前輪４及び後輪５は伸縮自在な車軸に支持され、そ
の軸距を調整自在としている。The front wheels 4 and the rear wheels 5 are supported by telescopic axles, and their wheelbases are adjustable.
即ち、第６図に示す如く、ミッションケース２の後部の
左右両側に固定後車軸ケース９が左右両側に突出するよ
う固定され、該固定後車軸ケース９に移動後車軸ケース
１０が伸縮自在に挿入されている。そして、前輪固定後
車軸ケース９と移動後車軸ケース１０にわたって、伸縮
自在な後車軸１１が支持され、該後車軸１１の先端に前
記後輪５が固定されている。That is, as shown in FIG. 6, a fixed rear axle case 9 is fixed to both left and right sides of the rear portion of the transmission case 2 so as to protrude to both left and right sides, and a moving rear axle case 10 is telescopically inserted into the fixed rear axle case 9. has been done. A telescopic rear axle 11 is supported across the front fixed rear axle case 9 and the movable rear axle case 10, and the rear wheel 5 is fixed to the tip of the rear axle 11.
前記固定後車軸ケース９には複動油圧シリンダ１２が形
成され、このシリンダ１２の移動体１３が移動後車軸ケ
ース１０に固定されている。A double-acting hydraulic cylinder 12 is formed in the fixed rear axle case 9, and a movable body 13 of this cylinder 12 is fixed to the movable rear axle case 10.
第１図に、前記複動油圧シリンダ１２と、その油圧回路
の詳細が示されている。FIG. 1 shows details of the double-acting hydraulic cylinder 12 and its hydraulic circuit.
即ち、複動油圧シリンダ１２は、固定後車軸ケース９に
固定されたピストン１４と、固定後車軸ケース９に摺動
自在に挿入されたシリンダチューブ（移動体）１３とか
ら成る。この移動体１３はピストン１４によって、ロッ
ド側油室１５とヘッド側油室１６とに区画されている。That is, the double-acting hydraulic cylinder 12 includes a piston 14 fixed to the fixed rear axle case 9 and a cylinder tube (moving body) 13 slidably inserted into the fixed rear axle case 9. The moving body 13 is divided into a rod-side oil chamber 15 and a head-side oil chamber 16 by a piston 14.
ロッド側油室１５に作動油が供給されると、移動体１３
は、固定後車軸ケース９に対して内側へ移動し、軸距を
短かくする。逆に、ヘッド側油室１６に作動油が供給さ
れると、軸距が長くなる。When hydraulic oil is supplied to the rod side oil chamber 15, the moving body 13
moves inward with respect to the fixed rear axle case 9 to shorten the wheelbase. Conversely, when hydraulic oil is supplied to the head-side oil chamber 16, the wheelbase becomes longer.
１７は制御弁装置であり、２位置６ポートの制御弁１８
と開閉弁１９とから成る。17 is a control valve device, which includes a 2-position, 6-port control valve 18;
and an on-off valve 19.
この制御弁装置１７の具体的構成が第２〜４図に示され
ている。The specific structure of this control valve device 17 is shown in FIGS. 2-4.
第１〜４図において、前記制御弁１８は、ポンプ側にＡ
ポート２０とＢボー）２１を有し、シリンダ側に第１〜
４ボー） ２２，２３，２４．２５を有する。In FIGS. 1 to 4, the control valve 18 is located at A on the pump side.
It has ports 20 and B bow) 21, and the first to
4 baud) has 22, 23, 24.25.
前記第１ポート２２及び第２ポート２３は、第１油路２
６及び第２油路２７を介して左右の複動油圧シリンダ１
２のロッド側油室１５に接続されている。第３及び第４
ポート２４ 、２５は、第３・４油路２８．２９を介し
て左右の複動油圧シリンダ１２のヘッド側油室１６に接
続されている。The first port 22 and the second port 23 are connected to the first oil path 2
6 and the left and right double-acting hydraulic cylinders 1 through the second oil passage 27.
It is connected to the rod side oil chamber 15 of No. 2. 3rd and 4th
The ports 24 and 25 are connected to the head-side oil chambers 16 of the left and right double-acting hydraulic cylinders 12 via third and fourth oil passages 28 and 29.
前記第１及び第２油路２６．２７に前記開閉弁１９゜１
９が各々設けられている。The opening/closing valve 19°1 is installed in the first and second oil passages 26 and 27.
9 are provided respectively.
前記制御弁１８及び開閉弁１９．１９は、１つのブロッ
ク３０内に設けられており、前記制御弁１８は、ブロッ
ク３０に回動自在に支持されたスプール３１をハンドル
３２で回動することにより、２位置に切換えられる。ス
プール３１を回動して、第１の位置におくと、Ａポート
２０と第１及び第２ポート２２．２３が連通し、かつ、
Ｂポート２１と第３及び第４ポート２４．２５が連通ず
る。また、第２の位置におくと、全てのポート２０，２
１．２２．２３．２４．２５が閉じられる。The control valve 18 and the on-off valves 19 and 19 are provided in one block 30, and the control valve 18 is operated by rotating a spool 31 rotatably supported by the block 30 with a handle 32. , switched to two positions. When the spool 31 is rotated and placed in the first position, the A port 20 communicates with the first and second ports 22 and 23, and
The B port 21 communicates with the third and fourth ports 24 and 25. Also, when placed in the second position, all ports 20, 2
1.22.23.24.25 is closed.
前記開閉弁１９．１９は、ブロック３０に螺合されたニ
ードル３３．３３により、前記第１及び第２油路２６゜
２７を開閉するように構成されている。前記ニードル３
３．３３の頂部に操作ハンドル３４．３４が固定されて
いる。The opening/closing valve 19.19 is configured to open and close the first and second oil passages 26 and 27 by means of a needle 33.33 screwed into the block 30. Said needle 3
An operating handle 34.34 is fixed to the top of 3.33.
前記ブロック３０には、Ａ−Ｂポート２０．２１に連通
ずるＡ−Ｂ接続口３５．３６と、第１〜４ポート２２゜
２３、２４．２５に連通ずる第１〜４接続口３７．３８
，３９．４０が設けられている。The block 30 has an A-B connection port 35.36 that communicates with the A-B port 20.21, and 1st to 4th connection ports 37.38 that communicate with the 1st to 4th ports 22.23 and 24.25.
, 39.40 are provided.
前記Ａ−Ｂ接続口３５．３６には、方向切換弁４１が接
続されており、この切換弁４１は、Ａ−Ｂポート２０．
２１を締め切る中立位置と、Ａポート２０をポンプ回路
４ｉに接続し、Ｂポート２１を戻り回路４３に接続する
第１の位置と、Ａボー）２０を戻り回路４３に接続し、
Ｂポート２１をポンプ回路４２に接続する第２の位置と
を有する、３位置４ポート弁である。A directional switching valve 41 is connected to the AB port 35.36, and this switching valve 41 is connected to the AB port 20.
a neutral position in which the A port 20 is connected to the pump circuit 4i and a first position in which the B port 21 is connected to the return circuit 43;
It is a 3-position, 4-port valve with a second position connecting the B port 21 to the pump circuit 42.
前記実施例によれば、ｔｄＪｉ［弁装置１７の開閉弁１
９を両方とも開き、かつ、制御弁１８を第１の位置にお
くと、両方の復動油圧シリンダ１２．１２が作動し、左
右の車軸１１の長さが同時に調整される。According to the embodiment, tdJi [on-off valve 1 of valve device 17]
9 are both opened and the control valve 18 is in the first position, both double-acting hydraulic cylinders 12,12 are actuated and the lengths of the left and right axles 11 are adjusted simultaneously.
また、いずれか一方の開閉弁１９を開き、他方を閉じる
と、開いた側の復動油圧シリンダ１２のみが作動し、一
方の車軸１１の長さが調整される。Furthermore, when one of the on-off valves 19 is opened and the other is closed, only the double-acting hydraulic cylinder 12 on the open side operates, and the length of one axle 11 is adjusted.
輪距調整が終わると、制御弁１８は第２位置にされ、か
つ、開閉弁１９．１９は閉じられる。この状態において
制御弁１８の全ポート２０，２１．２２．２３，２４．
２５は閉じられ、かつ、第１・２油路２６．２７は開閉
弁１９．１９で閉じられるので、左右の複動油圧シリン
ダ１２．１２は、油圧的にダブルロックされ、移動不能
になる。When the wheel width adjustment is completed, the control valve 18 is placed in the second position, and the on-off valves 19 and 19 are closed. In this state, all ports 20, 21, 22, 23, 24 .
25 is closed, and the first and second oil passages 26.27 are closed by the on-off valves 19.19, so the left and right double-acting hydraulic cylinders 12.12 are hydraulically double-locked and become immovable.
そして、第１・２油路２６．２７が開閉弁１９．１９で
閉じられているので、シリンダ１２．１２からの油もれ
が防止され、軸距が不慮に変動することがない。Since the first and second oil passages 26, 27 are closed by the on-off valves 19, 19, oil leakage from the cylinders 12, 12 is prevented, and the wheelbase does not change unexpectedly.
今、シリンダ１２の油温が上昇し、内圧が上がると、ロ
ッド側油室１５とへ、ド側油室１６のピストン面積差に
より、移動体１３が外方へ移動しようとする。しかし、
ロッド側油室１５の油は、開閉弁１９により完全に閉じ
られるので、流れることが出来ず、移動体１３の移動は
阻止される。そして、ヘッド側油室１６の内圧は、制御
弁１８のスプール３１からリークし、ヘッド側とロンド
側の押圧力が平衡し、不慮の軸距変動が防止される。Now, when the oil temperature in the cylinder 12 rises and the internal pressure rises, the movable body 13 tries to move outward due to the difference in piston area between the rod side oil chamber 15 and the do side oil chamber 16. but,
Since the oil in the rod-side oil chamber 15 is completely closed by the on-off valve 19, it cannot flow and movement of the movable body 13 is prevented. Then, the internal pressure in the head side oil chamber 16 leaks from the spool 31 of the control valve 18, and the pressing forces on the head side and the rond side are balanced, and accidental changes in the wheelbase are prevented.
尚、開閉弁１９をヘッド側油路に介在させると、シリン
ダ１２の内圧上昇により、移動体Ｉ３が移動するおそれ
があり、好ましくない。In addition, if the on-off valve 19 is interposed in the head-side oil passage, there is a risk that the movable body I3 will move due to an increase in the internal pressure of the cylinder 12, which is not preferable.
尚、本発明は、前記実施例に限定されるものではない。Note that the present invention is not limited to the above embodiments.
（発明の効果）
本発明によれば、開閉弁の掻作により、左右の車軸の一
方のみを調整したり、または、両方を同時に調整したり
できるので、必要に応じて使い分けることができ、軸距
調整作業が容易になる。(Effects of the Invention) According to the present invention, it is possible to adjust only one of the left and right axles, or to adjust both at the same time, by scraping the on-off valve. Distance adjustment work becomes easier.
第１図は本発明の実施例を示す油圧回路図、第２図は制
御弁装置の平面図、第３図は同正面図、第４図は同断面
図、第５図はトラクタの側面図、第６図は同平面図であ
る。
１１−車軸、１２−複動油圧シリンダ、１７−・制御弁
装置、１８−制御弁、１９−・−開閉弁、２０−・−Ａ
ポート、２１−Ｂポート、２２−第１ポート、２計第２
ポート、２４−第３ポート、２５−第４ポート。
襖１ ｄ
一Fig. 1 is a hydraulic circuit diagram showing an embodiment of the present invention, Fig. 2 is a plan view of the control valve device, Fig. 3 is a front view thereof, Fig. 4 is a sectional view thereof, and Fig. 5 is a side view of the tractor. , FIG. 6 is a plan view of the same. 11-Axle, 12-Double acting hydraulic cylinder, 17-・Control valve device, 18-Control valve, 19-・-Opening/closing valve, 20-・-A
Port, 21-B port, 22-1st port, 2 total 2nd
port, 24-third port, 25-fourth port. Fusuma 1 d 1
Claims (1)
伸縮させる複動油圧シリンダが設けられ、前記複動油圧
シリンダを制御する制御弁装置が設けられた車輌の輪距
調整装置において、前記制御弁装置は、２位置６ポート
の制御弁と、開閉弁とから成り、 前記制御弁は、ポンプ側にＡポートとＢポートとを有し
、シリンダ側に第１乃至第４ポートを有し、第１の位置
において、Ａポートと第１及び第２ポートが連通し、か
つ、Ｂポートと第３及び第４ポートが連通し、第２の位
置において、全ポートが閉じられるよう構成されており
、前記第１及び第２ポートは、前記左右一対の複動油圧
シリンダの各ロッド側油室に連通し、第３及び第４ポー
トは、同シリンダの各ヘッド側油室に連通し、 前記開閉弁は、前記第１及び第２ポートと各シリンダの
ロッド側油室とを結ぶ各油路の途中に設けられているこ
とを特徴とする車輌の輪距調整装置。(1) In a wheel width adjustment device for a vehicle, which is provided with a telescopic axle and a double-acting hydraulic cylinder that extends and retracts the axle on both the left and right sides of the vehicle body, and a control valve device that controls the double-acting hydraulic cylinder. , the control valve device consists of a 2-position, 6-port control valve and an on-off valve, and the control valve has an A port and a B port on the pump side, and first to fourth ports on the cylinder side. and configured such that in the first position, the A port communicates with the first and second ports, and the B port communicates with the third and fourth ports, and in the second position, all ports are closed. The first and second ports communicate with each rod-side oil chamber of the pair of left and right double-acting hydraulic cylinders, and the third and fourth ports communicate with each head-side oil chamber of the same cylinder. . A wheel distance adjustment device for a vehicle, wherein the on-off valve is provided in the middle of each oil passage connecting the first and second ports and the rod-side oil chamber of each cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2336002A JP2551689B2 (en) | 1990-11-29 | 1990-11-29 | Vehicle wheel distance adjuster |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2336002A JP2551689B2 (en) | 1990-11-29 | 1990-11-29 | Vehicle wheel distance adjuster |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04201603A true JPH04201603A (en) | 1992-07-22 |
| JP2551689B2 JP2551689B2 (en) | 1996-11-06 |
Family
ID=18294681
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2336002A Expired - Fee Related JP2551689B2 (en) | 1990-11-29 | 1990-11-29 | Vehicle wheel distance adjuster |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2551689B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5454583A (en) * | 1994-05-10 | 1995-10-03 | Ag-Chem Equipment Company, Inc. | Automatically adjusted rear axle track for agricultural vehicle with adjustable axles |
| JP2008207724A (en) * | 2007-02-27 | 2008-09-11 | Iseki & Co Ltd | Tread adjusting device for work vehicle |
-
1990
- 1990-11-29 JP JP2336002A patent/JP2551689B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5454583A (en) * | 1994-05-10 | 1995-10-03 | Ag-Chem Equipment Company, Inc. | Automatically adjusted rear axle track for agricultural vehicle with adjustable axles |
| JP2008207724A (en) * | 2007-02-27 | 2008-09-11 | Iseki & Co Ltd | Tread adjusting device for work vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2551689B2 (en) | 1996-11-06 |
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