JPS6137582A - Crawler type vehicle - Google Patents
Crawler type vehicleInfo
- Publication number
- JPS6137582A JPS6137582A JP15934884A JP15934884A JPS6137582A JP S6137582 A JPS6137582 A JP S6137582A JP 15934884 A JP15934884 A JP 15934884A JP 15934884 A JP15934884 A JP 15934884A JP S6137582 A JPS6137582 A JP S6137582A
- Authority
- JP
- Japan
- Prior art keywords
- hydraulic cylinder
- hydraulic
- crawler
- pressure
- track
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D11/00—Steering non-deflectable wheels; Steering endless tracks or the like
- B62D11/22—Endless track steering being effected by deflecting endless track rollers or the like
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Non-Deflectable Wheels, Steering Of Trailers, Or Other Steering (AREA)
Abstract
Description
【発明の詳細な説明】
〔発、明の利用分野〕
この発明は例えば油圧ショベル、油圧クレーン、ブルド
ーザ等の装軌式車両に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to tracked vehicles such as hydraulic excavators, hydraulic cranes, and bulldozers.
第６図は従来の装軌式車両の下部走行体を示す正面図、
第７図は同じく平面図である１図において、１は左右一
対のトラックフレーム、２はトラックフレーム１に設け
られた駆動輪、３はトラックフレーム１に設けられた遊
動輪、４．５はトラックフレーム１の上下位置に設けら
れた上ローラ、下ローラ、６Ｌ、６Ｒは駆動輪２と遊動
輪３との間に巻装された左右の履帯で、ｆｆ帯６Ｌ、６
Ｒは上ローラ４、下ローラ５によって案内されており、
下ローラ５は一列に並んでいて、履帯６Ｌ、６Ｒを地面
に均等に押付けている。そして、このような下部走行体
の上には本体（図示せず）が設けられ。Figure 6 is a front view showing the lower running body of a conventional tracked vehicle;
FIG. 7 is also a plan view. In FIG. 1, 1 is a pair of left and right truck frames, 2 is a driving wheel provided on the truck frame 1, 3 is an idler wheel provided on the truck frame 1, and 4.5 is a truck Upper rollers, lower rollers, 6L, 6R provided at the upper and lower positions of the frame 1 are left and right crawler belts wound between the drive wheel 2 and the idler wheel 3, and the ff belts 6L, 6
R is guided by an upper roller 4 and a lower roller 5,
The lower rollers 5 are arranged in a line and press the tracks 6L and 6R evenly against the ground. A main body (not shown) is provided on the lower traveling body.
その本体にはエンジン、油圧源等の動力源、運転室、さ
らにはクレーン、ショベル等の作業装置が設けられてい
る。The main body is provided with a power source such as an engine and a hydraulic power source, a driver's cab, and working devices such as a crane and a shovel.
このような装軌式車両において方向を変える場合には、
一方の履帯例えば履帯６Ｒを駆動し、他方の履帯６Ｌを
停止して、第７図の点ａを旋回中心とするピボットター
ンを行なうことがある。この場合、停止している履帯６
Ｌは旋回中心を軸に地表を滑りながら回転し、しかも第
８図に示すように、履帯６Ｌの接地圧分布は履帯６Ｌの
長手方向に一定であるから、摩擦旋回抵抗が非常に大き
い。When changing direction in such a tracked vehicle,
One of the crawlers, for example, the crawler 6R, may be driven and the other crawler 6L may be stopped to perform a pivot turn around point a in FIG. 7. In this case, the stopped track 6
L rotates around the turning center while sliding on the ground, and as shown in FIG. 8, the ground pressure distribution of the crawler 6L is constant in the longitudinal direction of the crawler 6L, so the frictional turning resistance is very large.
このため、十分な旋回力を得るためには大きな駆動力を
必要とする。Therefore, a large driving force is required to obtain sufficient turning force.
この発明は上述の問題点を解決するためになされたもの
で、ピボットターン時の履帯の摩擦旋回抵抗が小さい装
軌式車両を提供することを目的とする。The present invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a tracked vehicle in which the frictional turning resistance of the crawler track during pivot turns is small.
、この目的を達成するため、この発明においては、走行
体の左右のトラックフレームにそれぞれ駆動輪と遊動軸
とが設けられ、上記駆動輪と上記遊動輪との間に履帯を
巻装した装軌式車両において。In order to achieve this object, the present invention provides a tracked vehicle in which a drive wheel and an idler shaft are respectively provided on the left and right track frames of a traveling body, and a track is wound between the drive wheel and the idler wheel. In the ceremony vehicle.
左右の上記トラックフレームにそれぞれ第１．第２の油
圧シリンダを取付け、その第１．第２の油圧シリンダに
上記履帯のほぼ中央部と接する押え手段を取付け、左右
の上記駆動輪を回転する第１、第２の油圧モータに接続
された２本の管路間に第１、第２のシャトル弁を設け、
その第１．第２のシャトル弁の出口ボートと上記第２、
第１の油圧シ゛リンダとを第１、第２の方向切換弁を介
して接続する。1st. on the left and right track frames, respectively. Install the second hydraulic cylinder, and install the second hydraulic cylinder. A holding means is attached to the second hydraulic cylinder and is in contact with approximately the center of the crawler track, and the first and second hydraulic cylinders are connected between two pipes connected to the first and second hydraulic motors that rotate the left and right drive wheels. 2 shuttle valves are provided,
The first one. a second shuttle valve outlet boat and said second;
The first hydraulic cylinder is connected to the first hydraulic cylinder via first and second directional control valves.
第１図はこの発明に係る装軌式車両の下部走行体を示す
図である１図において、７Ｌ、７Ｒは左右のトラックフ
レーム１に取付けられた油圧シリンダ、８は油圧シリン
ダ７Ｌ、７Ｒのピストンロンドに回転可能に取付けられ
た下ローラで、図示のようにシリンダ７Ｌ、７Ｒが伸長
した状態では、下ローラ８が履帯６Ｌ、６Ｒの接地部の
ほぼ中央部を地面に押付けており、油圧シリンダ７Ｌ、
７Ｒが縮小した状態では、下ローラ８が他の下ローラ５
と同じ高さに位置している。FIG. 1 is a diagram showing an undercarriage of a tracked vehicle according to the present invention. In FIG. 1, 7L and 7R are hydraulic cylinders attached to the left and right truck frames 1, and 8 is a piston of the hydraulic cylinders 7L and 7R. When the cylinders 7L and 7R are extended as shown in the figure, the lower roller 8 presses approximately the center of the ground-contacting part of the tracks 6L and 6R against the ground, and the hydraulic cylinder 7L,
In the state where 7R is contracted, the lower roller 8 is connected to the other lower roller 5.
is located at the same height.
第３図は第１図に示した装軌式車両の油圧回路を示す図
である０図において、 ＩＩＬ、 ＩＩＲは左右の駆動
輪３を回転する走行油圧モータ、１２Ｌ、 １２Ｒは油
圧モータＩＩＬ、ＩＩＲに接続された２本の走行管路。FIG. 3 is a diagram showing the hydraulic circuit of the tracked vehicle shown in FIG. 1. In FIG. Two running pipelines connected to IIR.
１３Ｌ、 １３Ｒは２本の走行管路＋２Ｌ、 １２Ｒ間
に設けられたシャトル弁で、シャトル弁１３Ｌ、１３Ｒ
の出口ポー１−は油圧シリンダ７Ｒ１７Ｌに接続されて
いる。１４Ｌ、１４Ｒはシャ１〜ル弁１３Ｌ、 １３Ｒ
の出口ボートと油圧シリンダ７Ｒ，７Ｌとを接続する管
路に設けられた方向切換弁で、方向切換弁１４Ｌ、１４
Ｒは通常ａ位置であり、シャトル弁１３Ｌ、１３Ｒの出
口ボートと油圧もに、油圧シリンダ７Ｒ１７Ｌのロンド
側室とタンク１６とを接続し、またシャトル弁１３Ｒ，
１３ｔの出口ボートに圧力が立ったときには、ｂ位置に
切換わり、シャトル弁１３Ｌ、１３Ｒの出口ボートと油
圧シリンダ７Ｒ１７Ｌのロンド側室とを接続するととも
に。13L and 13R are shuttle valves installed between the two running pipes + 2L and 12R.
The outlet port 1- is connected to the hydraulic cylinder 7R17L. 14L and 14R are shaft valves 13L and 13R.
A directional switching valve installed in a pipe connecting the outlet boat and hydraulic cylinders 7R, 7L.
R is normally in the a position, and connects the outlet boats of the shuttle valves 13L and 13R to the hydraulic pressure, the rond side chamber of the hydraulic cylinder 7R17L and the tank 16, and also connects the shuttle valves 13R and 13R to the tank 16.
When pressure builds up in the outlet boat of 13t, it switches to position b, connecting the outlet boats of shuttle valves 13L, 13R and the rond side chamber of hydraulic cylinder 7R17L.
油圧シリンダ７Ｒ１７Ｌのボトム側室とタンク１６とを
接続する。１５Ｌ、 １５Ｒは油圧モータＩＩＬ、１１
Ｒのカウンタバランス弁である。The bottom side chamber of the hydraulic cylinder 7R17L and the tank 16 are connected. 15L, 15R are hydraulic motors IIL, 11
R counter balance valve.
この装軌式車両において、一方の油圧モータ例えば抽圧
モータｌＩＲを駆動し、他方の油圧モータ１１Ｌを停止
した場合には、シャトル弁１３Ｒの出口ポートに圧力が
立ち、方向切換弁１４Ｌがｂ位置になるが、シャトル弁
１３Ｌの出口ボートには圧力が立たないから、油圧シリ
ンダ７Ｒには圧油は供給されず、油圧シリンダ７Ｒは縮
小した状態となる。In this tracked vehicle, when one hydraulic motor, for example, extraction motor lIR, is driven and the other hydraulic motor 11L is stopped, pressure builds up at the outlet port of the shuttle valve 13R, and the directional control valve 14L is moved to position b. However, since no pressure is built up in the outlet boat of the shuttle valve 13L, no pressure oil is supplied to the hydraulic cylinder 7R, and the hydraulic cylinder 7R is in a contracted state.
また、シャトル弁１３Ｌの出口ボートには圧力が立たな
いので、方向切換弁１４Ｒがａ位置となるから、油圧モ
ータＩＩＲの駆動圧がシャトル弁１３Ｒ１方向切換弁１
４Ｒを介して油圧シリンダ７Ｌのボトム側室に供給され
、油圧シリンダ７Ｌが伸長する。このため、下ローラ８
により履帯６Ｌの中央部が地面に押付けられた状態で履
帯６Ｒのみが駆動され、ピボットターンが行なわれる。In addition, since no pressure is built up in the outlet boat of the shuttle valve 13L, the directional control valve 14R is at position a, so that the drive pressure of the hydraulic motor IIR is applied to the shuttle valve 13R1, the directional control valve 1
It is supplied to the bottom side chamber of the hydraulic cylinder 7L via 4R, and the hydraulic cylinder 7L is extended. For this reason, the lower roller 8
As a result, only the crawler belt 6R is driven with the center portion of the crawler belt 6L being pressed against the ground, and a pivot turn is performed.
このとき、履帯６Ｌの接地圧分布は履帯６Ｌの中央部で
は接地圧ｐが太きく、Ｈ帯６Ｌの接地部端部では接地圧
ｐが零に近づく傾向となる。この−例を第２図に示す。At this time, the ground pressure distribution of the crawler belt 6L has a tendency that the ground pressure p is large at the center of the crawler belt 6L, and the ground pressure p approaches zero at the end of the ground contact portion of the H band 6L. An example of this is shown in FIG.
ここで、履帯６Ｌと地面との動摩擦係数をμ、従来の装
軌式車両の履帯６Ｌの接地圧をＰｌ、旋回中心から履帯
６Ｌの接地部端部までの距離をＱとすると、従来の装軌
式車両の履帯６Ｌの摩擦旋回抵抗Ｒ□は次式で表わされ
る。Here, if μ is the coefficient of dynamic friction between the track 6L and the ground, Pl is the ground contact pressure of the track 6L of a conventional tracked vehicle, and Q is the distance from the turning center to the end of the ground contact part of the track 6L. The friction turning resistance R□ of the crawler track 6L of the tracked vehicle is expressed by the following equation.
Ｒ１＝２１亀μｐ１ｘｄス＝ μ Ｐｘ Ｑ”これに
対して、第２図に示す接地圧分布状態にある装軌式車両
の履帯６ＬのＪ！Ｊ！擦旋回抵抗Ｒ２は、装軌式車両の
重量が同じであるとすると次式で表わされる。R1=21μp1xds=μPx Q"On the other hand, the J!J! friction turning resistance R2 of the track 6L of the tracked vehicle in the ground pressure distribution state shown in FIG. Assuming that the weight is the same, it is expressed by the following equation.
このように、この発明の装軌式車両の履帯６Ｌの摩擦旋
回抵抗Ｒ２は、第２図に示す接地圧分布であれば、従来
の装軌式車両の履帯６Ｌの摩擦旋回 −抵抗Ｒ１と比較
して２／３である。ところで、第２図に示す接地圧分布
は一例であり、路面の硬さおよび油圧シリンダ７Ｌのス
トロークによって分布傾向が異なってくる。しかし、従
来のものに比べ、接地圧が履帯６Ｌの中央部で高くなる
ことは確かであり、摩擦旋回抵抗が従来よりも低減され
ることは確実である。そして、旋回抵抗が大きくなると
、油圧モータＩＩＲの駆動圧が高くなり、油圧シリンダ
７Ｌに供給される圧力が増大するので、油圧シリンダ７
Ｌの推力が大きくなり、履帯６Ｌの摩擦旋回抵抗がさら
に軽減されて、旋回抵抗が小さくなる。なお、油圧モー
タＩＩＬを駆動し、油圧モータＩＩＲを停止した時にも
、同様な動作が行なわれる０次に、油圧モータＩＩＬ、
ＩＩＲを同時に駆動した時には、第一４図に示すように
、方向切換弁１４Ｌ、 １４Ｒがともにｂ位置となり、
油圧モータ１１Ｌ、１１Ｒ（７）ＭＦＪＩ圧がシャトル
弁１３Ｌ、１３Ｒ１方向切換弁１４Ｌ、 １４Ｒを介し
て油圧シリンダ７Ｒ，７Ｌのロンド側室に供給されるか
ら、油圧シリンダ７Ｒ１７Ｌが縮小し、直進走行可能な
状態になる。 なお、上述実施例においては、油圧シリ
ンダ７Ｌ、７Ｒに押え手段として一個の下ローラ８を取
付けたが、油圧シリンダ７Ｌ、７Ｒに複数の下ローラを
取付けてもよく、また第５図に示すように、油圧シリン
ダ７Ｌ、７Ｒに履帯６Ｌ、６Ｒと摺動可能なトラックガ
ード９を取付けてもよい、さらに、第１図においては、
説明をし易くするため、履帯６Ｌの両端が地面から浮い
た状態を図示しているが、第２図に示すとと＜、Ｊｌ！
帯６Ｌ、６Ｒの中央から両端に向かって接地圧を下げれ
ばよく、履帯６Ｌ、６Ｒの両端が地面から浮くほど油圧
シリンダ７Ｌ、７Ｒに推力を持たせる必要はない。また
、下部走行体の上にセンタジヨイントを介して本体が設
けられた装軌式車両においては、シャトル弁１３Ｌ、１
３Ｒから油圧シリンダ７Ｌ、７Ｒまでの回路をセンタジ
ヨイントより下部走行体側に設ければ、センタジヨイン
トのボートを増やす必要がない。As described above, the friction turning resistance R2 of the track 6L of the tracked vehicle of the present invention is compared with the friction turning resistance R1 of the track 6L of the conventional tracked vehicle if the ground pressure distribution is shown in FIG. It is 2/3. By the way, the ground pressure distribution shown in FIG. 2 is just an example, and the distribution tendency varies depending on the hardness of the road surface and the stroke of the hydraulic cylinder 7L. However, it is certain that the ground pressure is higher at the center of the crawler belt 6L than in the conventional case, and it is certain that the frictional turning resistance is lower than in the conventional case. When the turning resistance increases, the driving pressure of the hydraulic motor IIR increases, and the pressure supplied to the hydraulic cylinder 7L increases.
The thrust force of L increases, and the frictional turning resistance of the crawler belt 6L is further reduced, resulting in smaller turning resistance. Note that when the hydraulic motor IIL is driven and the hydraulic motor IIR is stopped, the same operation is performed.
When IIR is driven simultaneously, both directional control valves 14L and 14R are in position b, as shown in Figure 14.
Hydraulic motors 11L, 11R (7) MFJI pressure is supplied to the rond side chambers of hydraulic cylinders 7R, 7L via shuttle valves 13L, 13R1 directional switching valves 14L, 14R, so hydraulic cylinder 7R17L is contracted, allowing straight-ahead travel. become a state. In the above embodiment, one lower roller 8 is attached to the hydraulic cylinders 7L, 7R as a pressing means, but a plurality of lower rollers may be attached to the hydraulic cylinders 7L, 7R, or as shown in FIG. In addition, a track guard 9 that can slide on the tracks 6L and 6R may be attached to the hydraulic cylinders 7L and 7R.Furthermore, in FIG.
For ease of explanation, both ends of the crawler track 6L are shown floating above the ground, but as shown in Fig. 2, <, Jl!
It is sufficient to reduce the ground pressure from the center of the tracks 6L, 6R toward both ends, and it is not necessary to provide the hydraulic cylinders 7L, 7R with such thrust that both ends of the tracks 6L, 6R float off the ground. In addition, in a tracked vehicle in which the main body is provided above the undercarriage via a center joint, the shuttle valves 13L, 1
If the circuit from 3R to the hydraulic cylinders 7L and 7R is provided closer to the lower traveling body than the center joint, there is no need to increase the number of boats for the center joint.
以上説明したように、この発明に係る装軌式車両におい
ては、ピボットターンを行なう場合の履 帯の摩擦旋回
抵抗が小さいから、ピボットターンを容易に行なうこと
ができるとともに、駆動力が少なくてすみ、下部走行体
、エンジンの小形化が可能となる。また、旋回抵抗に応
じて油圧シリンダの推力を制御することができるから、
履帯の摩擦旋回抵抗を有効に軽減することが可能である
。As explained above, in the tracked vehicle according to the present invention, since the frictional turning resistance of the tracks when making a pivot turn is small, the pivot turn can be easily made and requires less driving force. , the undercarriage, and the engine can be made smaller. In addition, since the thrust of the hydraulic cylinder can be controlled according to the turning resistance,
It is possible to effectively reduce the frictional turning resistance of the crawler track.
このように、この発明の効果は顕著である。As described above, the effects of this invention are remarkable.
第、１図はこの発明に係る装軌式車両の下部走行体を示
す図、第２図は第１図に示した下部走行体の履帯の接地
圧分布を示すグラフ、第３図は第１図に示した装軌式車
両の油圧回路を示す図、第４図は第３図に示した油圧回
路の動作説明図、第５図はこの発明に係る他の装軌式車
両の下部走行体を示す図、第６図は従来の装軌式車両の
下部走行体を示す正面図、第７図は同じく平面図、第８
図は第６図に示した下部走行体の履帯の接地圧分布を示
すグラフである。
１・・・トラックフレーム ２・・・駆動輪３・・・遊
動輪 ６Ｌ、６Ｒ・・・履帯７Ｌ、７Ｒ・・
・油圧シリンダ1 is a diagram showing the undercarriage of the tracked vehicle according to the present invention, FIG. 2 is a graph showing the ground pressure distribution of the crawler of the undercarriage shown in FIG. 1, and FIG. 4 is an explanatory diagram of the operation of the hydraulic circuit shown in FIG. 3, and FIG. 5 is an undercarriage of another tracked vehicle according to the present invention. FIG. 6 is a front view showing the undercarriage of a conventional tracked vehicle, FIG. 7 is a plan view, and FIG.
This figure is a graph showing the ground pressure distribution of the crawler track of the lower traveling body shown in FIG. 6. 1...Truck frame 2...Drive wheel 3...Idler wheel 6L, 6R...Crawler track 7L, 7R...
・Hydraulic cylinder
Claims (1)
動輪とが設けられ、上記駆動輪と上記遊動輪との間に履
帯を巻装した装軌式車両において、左右の上記トラック
フレームにそれぞれ第１、第２の油圧シリンダを取付け
、その第１、第２の油圧シリンダに上記履帯のほぼ中央
部と接する押え手段を取付け、左右の上記駆動輪を回転
する第１、第２の油圧モータに接続された２本の管路間
に第１、第２のシャトル弁を設け、その第１、第２のシ
ャトル弁の出口ポートと上記第２、第１の油圧シリンダ
とを第１、第２の方向切換弁を介して接続したことを特
徴とする装軌式車両。In a tracked vehicle in which a driving wheel and an idler wheel are provided on the left and right track frames of the traveling body, and a track is wound between the drive wheel and the idler wheel, a first track frame is provided on each of the left and right track frames. , a second hydraulic cylinder is attached, a holding means is attached to the first and second hydraulic cylinders in contact with approximately the center of the crawler track, and the holding means is connected to the first and second hydraulic motors that rotate the left and right drive wheels. First and second shuttle valves are provided between the two pipes, and the outlet ports of the first and second shuttle valves are connected to the second and first hydraulic cylinders. A tracked vehicle characterized by being connected via a directional switching valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15934884A JPS6137582A (en) | 1984-07-31 | 1984-07-31 | Crawler type vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15934884A JPS6137582A (en) | 1984-07-31 | 1984-07-31 | Crawler type vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6137582A true JPS6137582A (en) | 1986-02-22 |
| JPH0328354B2 JPH0328354B2 (en) | 1991-04-18 |
Family
ID=15691877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15934884A Granted JPS6137582A (en) | 1984-07-31 | 1984-07-31 | Crawler type vehicle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6137582A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63306977A (en) * | 1987-06-10 | 1988-12-14 | Kubota Ltd | Crawler |
| JPS63306979A (en) * | 1987-06-10 | 1988-12-14 | Kubota Ltd | Crawler |
| JPS63312272A (en) * | 1987-06-12 | 1988-12-20 | Kubota Ltd | Crawler vehicle |
| JPH026765A (en) * | 1988-01-06 | 1990-01-10 | Teledyne Inc | Automatic circuit tester control system |
| JPH0321567A (en) * | 1989-06-20 | 1991-01-30 | Kubota Corp | Working vehicle revolution control device |
| JPH0466590U (en) * | 1990-10-22 | 1992-06-11 | ||
| JPH0862297A (en) * | 1994-08-26 | 1996-03-08 | Nec Corp | Digital-signal processing lsi test circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5257625A (en) * | 1975-11-06 | 1977-05-12 | Kubota Ltd | Steering device of vehicle body having crawlers |
| JPS53114136A (en) * | 1977-03-14 | 1978-10-05 | Kubota Ltd | Crawler driving device |
-
1984
- 1984-07-31 JP JP15934884A patent/JPS6137582A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5257625A (en) * | 1975-11-06 | 1977-05-12 | Kubota Ltd | Steering device of vehicle body having crawlers |
| JPS53114136A (en) * | 1977-03-14 | 1978-10-05 | Kubota Ltd | Crawler driving device |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63306977A (en) * | 1987-06-10 | 1988-12-14 | Kubota Ltd | Crawler |
| JPS63306979A (en) * | 1987-06-10 | 1988-12-14 | Kubota Ltd | Crawler |
| JPS63312272A (en) * | 1987-06-12 | 1988-12-20 | Kubota Ltd | Crawler vehicle |
| JPH026765A (en) * | 1988-01-06 | 1990-01-10 | Teledyne Inc | Automatic circuit tester control system |
| JPH0321567A (en) * | 1989-06-20 | 1991-01-30 | Kubota Corp | Working vehicle revolution control device |
| JPH0466590U (en) * | 1990-10-22 | 1992-06-11 | ||
| JPH0862297A (en) * | 1994-08-26 | 1996-03-08 | Nec Corp | Digital-signal processing lsi test circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0328354B2 (en) | 1991-04-18 |
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