JP3119058B2 - Shield machine - Google Patents
Shield machineInfo
- Publication number
- JP3119058B2 JP3119058B2 JP05323967A JP32396793A JP3119058B2 JP 3119058 B2 JP3119058 B2 JP 3119058B2 JP 05323967 A JP05323967 A JP 05323967A JP 32396793 A JP32396793 A JP 32396793A JP 3119058 B2 JP3119058 B2 JP 3119058B2
- Authority
- JP
- Japan
- Prior art keywords
- hydraulic
- rear bogie
- excavator
- traction
- jacks
- 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.)
- Expired - Fee Related
Links
Landscapes
- Excavating Of Shafts Or Tunnels (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明はシールド掘進機に係り、
特に掘進機本体により後方台車を牽引する牽引装置に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine,
In particular, the present invention relates to a traction device that pulls a rear bogie by an excavator body.
【０００２】[0002]
【従来の技術】シールド掘進機は、地山を掘削した後に
セグメントを組み立てながら進む掘進機本体と、該掘進
機本体に牽引されて追従する後方台車と、両者間を連結
する牽引ロッドまたは牽引ロープ等の連結部材を有する
牽引装置とを備えている。2. Description of the Related Art A shield machine is an excavator body that excavates a ground and advances while assembling segments, a rear bogie that is towed and follows the excavator body, and a tow rod or tow rope that connects the two. And a traction device having a connecting member.
【０００３】大口径のシールド掘進機における後方台車
は門形に構成される場合が多く、後方台車の安定性を考
慮して、前記牽引部材は水平方向に離れた左右の位置に
それぞれ設置される。そして、直進区間から曲進区間へ
進入すると、曲路の内周側と外周側では掘進機本体と後
方台車の間の距離が変化するので、一定長の連結部材で
は外周側の連結部材に牽引力が集中し、内周側の連結部
材は張力を失って弛むことになり、偏った不安定な牽引
状態になる。The rear bogie of a large-diameter shield excavator is often formed in a gate shape, and in consideration of the stability of the rear bogie, the traction members are respectively installed at left and right positions separated horizontally. . When entering the curved section from the straight traveling section, the distance between the excavator body and the rear bogie changes on the inner peripheral side and the outer peripheral side of the curved road, so that the traction force is applied to the outer peripheral side coupling member by the fixed length coupling member. Are concentrated, the connecting member on the inner peripheral side loses tension and becomes slack, resulting in a biased and unstable traction state.
【０００４】このようなことから、ターンバックルやチ
ェインブロック等を用いて連結部材による牽引間隔を調
整しているが、調整作業は人為的に行うように構成され
ており、従って、連続的に変化する間隔に合わせた長さ
調整作業が面倒であった。特に、左右の連結部材による
牽引力の分担割合を等しくするために両者の張力を検出
する方法は、両者の弛み具合を目視で観察するか、また
は押したときの反力を感触で観察するか、であり、正確
な調整を行うためには相当の熟練と作業時間が必要であ
った。[0004] For this reason, the towing interval of the connecting member is adjusted by using a turnbuckle, a chain block, or the like. However, the adjusting operation is configured to be performed manually, and therefore, the adjustment operation is performed continuously. It was troublesome to adjust the length according to the interval. In particular, the method of detecting the tension of both in order to equalize the share of the traction force by the left and right connecting members, whether to observe the looseness of both visually, or to observe the reaction force when pressed, by touch, In order to make accurate adjustments, considerable skill and work time were required.
【０００５】[0005]
【発明が解決しようとする課題】以上のように従来のシ
ールド掘進機においては、直進路から曲進路へ進入する
とき，曲進路中で曲率が変化するとき，曲進路から直進
路へ脱出するときに、牽引装置の連結部材による牽引間
隔の人為的な調整作業が必要であり、相当の熟練と作業
時間を必要とする問題があった。As described above, in the conventional shield excavator, when approaching from a straight path to a curved path, when the curvature changes along the curved path, or when exiting from the curved path to the straight path. In addition, there is a problem that an artificial adjustment work of the towing interval by the connecting member of the towing device is required, and considerable skill and work time are required.
【０００６】本発明の目的は、進路の変化によって掘進
機本体と後方台車の間隔の変化が進路の左右両側で異な
るときに、左右に離れて位置する牽引部材による牽引間
隔を自動的に調整して左右の牽引力を等しくし、進路の
変化に則して安定な牽引を実現できる牽引装置を得るこ
とにある。An object of the present invention is to automatically adjust the towing interval of a towing member located left and right when the change in the distance between the excavator body and the rear bogie is different on the left and right sides of the course due to the change in the course. It is an object of the present invention to obtain a traction device capable of equalizing traction forces on the left and right sides and realizing stable traction according to a change in course.
【０００７】[0007]
【課題を解決するための手段】本発明は、掘進機本体と
該掘進機本体に牽引装置を介して連結される後方台車を
備えたシールド掘進機において、前記牽引装置に、水平
方向に離れた位置で掘進機本体と後方台車に連結する２
本の液圧ジャッキと、該２本の液圧ジャッキのボトム側
液圧室同志及びロッド側液圧室同志を連通する液圧連通
手段を設けたことを特徴とする。SUMMARY OF THE INVENTION The present invention is directed to a shielded excavator having an excavator main body and a rear bogie connected to the excavator main body via a traction device. Connect the excavator body and rear bogie at the position 2
The two hydraulic jacks are provided with hydraulic communication means for communicating between the bottom hydraulic chambers and the rod hydraulic chambers of the two hydraulic jacks.
【０００８】[0008]
【作用】直進区間と曲進区間の境目付近では、一方の液
圧ジャッキの牽引力が大きくなり他方の液圧ジャッキの
牽引力が小さくなるように作用するが、液圧連通手段が
両液圧ジャッキのボトム側液圧室同志及びロッド側液圧
室同志の液圧を等しくするするように液体の移動を仲介
するので、両液圧ジャッキは牽引力が等しくなるように
自動的に伸縮して間隔の変化を吸収する。[Function] In the vicinity of the boundary between the straight section and the curved section, the traction force of one hydraulic jack is increased and the traction force of the other hydraulic jack is reduced, but the hydraulic communication means is operated by both hydraulic jacks. Since the movement of the liquid is mediated to equalize the hydraulic pressure between the bottom hydraulic chambers and the rod-side hydraulic chambers, both hydraulic jacks automatically expand and contract so that the traction force is equal, and the gap changes. Absorb.
【０００９】[0009]
【実施例】以下、本発明の実施例を図面を参照して説明
する。図１に示すように、地山１を掘削するシールド掘
進機本体２は、円筒上のシールドフレーム３の先頭部に
カッターヘッド４を備え、トンネルの壁面に組み立てら
れたセグメント５の先端を推進ジャッキ６で押すことに
よって得られる反力で推進する。また。セグメント５の
組み立て作業台として使用する後方デッキ７を備える。
前記掘進機本体２の掘進に必要な油圧機器，電気機器及
び操作盤等を搭載する後方台車８は牽引装置１０により
前記後方デッキ７に連結され、推進機本体２に牽引され
てレール１１上を走行する。Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a shield machine body 2 for excavating a ground 1 is provided with a cutter head 4 at a leading end of a shield frame 3 on a cylinder, and a tip of a segment 5 assembled on a wall surface of a tunnel is used as a propulsion jack. Propulsion with the reaction force obtained by pushing with 6. Also. A rear deck 7 used as an assembly work table for the segment 5 is provided.
A rear bogie 8 mounted with hydraulic equipment, electric equipment, an operation panel, and the like necessary for excavating the excavator body 2 is connected to the rear deck 7 by a traction device 10, towed by the propulsion machine body 2, and moved on a rail 11. To run.
【００１０】前記牽引装置１０は、図２に詳細に示すよ
うに、水平方向に離れた左右の両側部位置で前記後方デ
ッキ７と後方台車８を連結する２本の油圧ジャッキ１
２，１３を備える。各油圧ジャッキ１２，１３は、それ
ぞれ、牽引ロッド１４，１５を介して後方台車８に連結
されるシリンダ部１２ａ，１３ａと、後方デッキ７に連
結されるピストン部１２ｂ，１３ｂを備え、各ロッド側
油圧室１２ｃ，１３ｃ同志及びボトム側油圧室１２ｄ，
１３ｄは可撓性の油圧室連通管１６，１７によってそれ
ぞれ連通されている。As shown in detail in FIG. 2, the traction device 10 includes two hydraulic jacks 1 for connecting the rear deck 7 and the rear bogie 8 at left and right side portions separated horizontally.
2 and 13 are provided. Each of the hydraulic jacks 12, 13 includes a cylinder portion 12a, 13a connected to the rear bogie 8 via a towing rod 14, 15, and a piston portion 12b, 13b connected to the rear deck 7, respectively. The hydraulic chambers 12c, 13c and the bottom hydraulic chamber 12d,
13d is communicated by flexible hydraulic chamber communication pipes 16 and 17, respectively.
【００１１】前記油圧ジャッキ１２，１３は油圧室連通
管１６，１７によって両ロッド側油圧室１２ｃ，１３ｃ
同志及びボトム側油圧室１２ｄ，１３ｄが等圧にされる
と共に油圧制御装置１８によって平均伸長量制御及び過
大牽引防止が行われる。The hydraulic jacks 12 and 13 are connected to both rod-side hydraulic chambers 12 c and 13 c by hydraulic chamber communication pipes 16 and 17.
The pressure in the hydraulic chambers 12d and 13d on the competitor and bottom sides is made equal, and the control of the average extension amount and the prevention of excessive traction are performed by the hydraulic control device 18.
【００１２】この油圧制御装置１８は、図３に示すよう
に、オイルタンク１９に蓄積したオイルをオイルポンプ
２０で加圧した後に断続及び方向切換え弁２１によって
連通管１５，１７に供給して平均伸長量を制御し、チェ
ック弁２２〜２５とオーバーロードリリーフ弁２６によ
って過大油圧を放出して過大な牽引力が発生しないよう
に制御する構成である。As shown in FIG. 3, the hydraulic control device 18 pressurizes oil accumulated in an oil tank 19 with an oil pump 20 and then supplies the oil to communication pipes 15 and 17 by an intermittent and direction switching valve 21 to average the oil. The amount of extension is controlled, and control is performed so that excessive hydraulic pressure is released by the check valves 22 to 25 and the overload relief valve 26 so that excessive tractive force is not generated.
【００１３】以上の構成において、掘進機本体２が掘進
すると後方台車８は牽引装置１０により該掘進機本体２
に牽引されて追従する。掘進機本体２と後方台車８の平
均間隔は、牽引装置１０の連結部材の長さによって決ま
るものであり、油圧ジャッキ１２，１３の伸長量を油圧
ポンプ２０と切換え弁２１によって調節される。すなわ
ち、両油圧ジャッキ１２，１３のロッド側油圧室１２
ｃ，１３ｃに作動油を供給すれば該両油圧ジャッキ１
２，１３が伸長して掘進機本体２と後方台車の平均間隔
は大きくなり、反対に、ボトム側油圧室１２ｄ，１３ｄ
に作動油を供給すれば該両油圧ジャッキ１２，１３が短
縮して掘進機本体２と後方台車の平均間隔が小さくな
る。In the above configuration, when the excavator body 2 excavates, the rear bogie 8 is moved by the towing device 10 to the excavator body 2.
Followed by being towed. The average distance between the excavator body 2 and the rear bogie 8 is determined by the length of the connecting member of the traction device 10, and the amount of extension of the hydraulic jacks 12 and 13 is adjusted by the hydraulic pump 20 and the switching valve 21. That is, the rod-side hydraulic chambers 12 of both hydraulic jacks 12 and 13
If hydraulic oil is supplied to c and 13c, both hydraulic jacks 1
2, 13 extend, the average distance between the excavator body 2 and the rear bogie increases, and conversely, the bottom side hydraulic chambers 12d, 13d
, The hydraulic jacks 12, 13 are shortened, and the average distance between the excavator body 2 and the rear bogie is reduced.
【００１４】そして、掘進機本体２が直進区間から左曲
りの曲進区間に進入すると該掘進機本体２が左廻りに転
角するので、図４に示すように、油圧ジャッキ１３側の
牽引負荷が大きくなるように作用し、左右の油圧ジャッ
キ１２，１３のロッド側油圧室１２ｃ，１３ｃの油圧Ｐ
LR，ＰRR及びボトム側油圧室１２ｄ，１３ｄの油圧ＰL
B，ＰRBの相対関係は、ＰLR＜ＰRR及びＰLB＞ＰRBとな
る。しかしながら、ロッド側油圧室１２ｃ，１３ｃ同志
は連通管１６で連通し、ボトム側油圧室１２ｄ，１３ｄ
同志も連通管１７で連通しているのでこの油圧差がなく
なるように作動油が流動し、油圧ジャッキ１２は縮小す
るようにピストン部１２ｂが移動し、油圧ジャッキ１３
は伸長するようにピストン部１３ｂが移動する。結局、
両油圧ジャッキ１２，１３は牽引負荷が等しくなるよう
に伸縮するので、後方台車８は、図５に示すように、曲
進路に沿った姿勢で左右等しい安定した牽引力で牽引さ
れるようになる。When the excavator body 2 enters a left-turning section from a straight section, the excavator body 2 turns counterclockwise. As shown in FIG. 4, the traction load on the hydraulic jack 13 side is increased. And the hydraulic pressure P in the rod-side hydraulic chambers 12c and 13c of the left and right hydraulic jacks 12 and 13 is increased.
LR, PRR and hydraulic pressure PL of the bottom side hydraulic chambers 12d, 13d
The relative relationship between B and PRB is PLR <PRR and PLB> PRB. However, the rod side hydraulic chambers 12c and 13c communicate with each other through the communication pipe 16, and the bottom side hydraulic chambers 12d and 13d
Since the comrades also communicate with each other through the communication pipe 17, the hydraulic oil flows so as to eliminate the oil pressure difference, the piston portion 12b moves so that the hydraulic jack 12 contracts, and the hydraulic jack 13
The piston 13b moves so as to extend. After all,
Since the two hydraulic jacks 12 and 13 extend and contract so that the traction loads become equal, the rear bogie 8 is towed with a stable traction force equal to the left and right in a posture along a curved course as shown in FIG.
【００１５】このような作動油の流動による油圧ジャッ
キ１２，１３の伸縮は、掘進路の変化により掘進機本体
２と後方台車８の向きが相対的に変化することにより油
圧差が発生する度に自動的に発生するので、直進区間か
ら曲進区間への進入，曲進区間における曲率半径の変
化，曲進区間から直進区間への脱出の過程で必要になる
牽引部材の連続的な長さ調整が自動的に行われることに
なる。The expansion and contraction of the hydraulic jacks 12 and 13 due to the flow of the hydraulic oil occurs every time a hydraulic pressure difference is generated due to a relative change in the direction of the excavator body 2 and the rear bogie 8 due to a change in the excavation path. Since it is automatically generated, continuous length adjustment of the traction member required in the process of entering from a straight section to a curved section, changing the radius of curvature in a curved section, and exiting from a curved section to a straight section. Will be performed automatically.
【００１６】そして、後方台車８が脱線や障害物等によ
りその進行が阻害された状態で掘進機本体２が掘進する
と、牽引装置１０の牽引負荷は次第に大きくなる。この
牽引負荷の増大は、油圧ジャッキ１２，１３におけるロ
ッド側油圧室１２ｃ，１３ｃの油圧の増大となって現
れ、その値がオーバーロードリリーフ弁２６の設定値に
達すると以降は該弁２６が動作して作動油を放出して油
圧ジャッキ１２，１３を伸長することによって過大な牽
引力になるのを防止する。そして、油圧ジャッキ１２，
１３に設けたストローク計やリミットスイッチ等の伸縮
量検出器によって該油圧ジャッキ１２，１３の伸長を監
視することにより異常状態を把握し、後方台車８の牽引
を解除し、障害を排除した後に牽引を再開して所定の牽
引間隔とするように切換え弁２１によって両油圧ジャッ
キ１２，１３を伸縮制御することにより、掘進機本体２
を停止させることなく復旧作業を行うことができる。ま
た、油圧ジャッキ１２，１３による伸縮制御では対応で
きないような場合には掘進機本体２の掘進作業を停止す
るようにする。When the excavator body 2 excavates in a state where the rear bogie 8 is obstructed by derailment or obstacles, the towing load of the towing device 10 gradually increases. This increase in the traction load appears as an increase in the hydraulic pressure in the rod-side hydraulic chambers 12c, 13c in the hydraulic jacks 12, 13, and when the value reaches the set value of the overload relief valve 26, the valve 26 operates thereafter. Then, the hydraulic oil is released to extend the hydraulic jacks 12 and 13, thereby preventing an excessive traction force. And the hydraulic jack 12,
An abnormal state is grasped by monitoring the extension of the hydraulic jacks 12 and 13 by an expansion / contraction detector such as a stroke meter and a limit switch provided on the 13, and the towing of the rear bogie 8 is released, and after removing the obstacle, the towing is performed. Of the hydraulic excavator main body 2 by controlling the expansion and contraction of both hydraulic jacks 12 and 13 by the switching valve 21 so as to resume the predetermined towing interval.
Recovery work can be performed without stopping the operation. If the expansion and contraction control by the hydraulic jacks 12 and 13 cannot be performed, the excavation work of the excavator body 2 is stopped.
【００１７】なお、油圧ジャッキ１２，１３は掘進機本
体２と後方台車８を連結する部材中に直列に介在すれ
ば、種々の介在形態において牽引力の均等化を実現する
ことができるが、油圧配管系を簡易化するためにはシリ
ンダ部１２ａ，１３ａを後方台車８に連結する形態が好
都合である。If the hydraulic jacks 12, 13 are interposed in series in the member connecting the excavator body 2 and the rear bogie 8, the traction force can be equalized in various modes. In order to simplify the system, a mode in which the cylinder portions 12a and 13a are connected to the rear bogie 8 is convenient.
【００１８】[0018]
【発明の効果】本発明は、後方台車を掘進機本体に牽引
させる牽引装置に、水平方向に離れた位置で掘進機本体
と後方台車に連結する２本の液圧ジャッキと、該２本の
液圧ジャッキのボトム側液圧室同志及びロッド側液圧室
同志を連通する液圧連通手段を設け、両液圧ジャッキの
ボトム側液圧室同志及びロッド側液圧室同志の液圧を等
しくするように作動液を移動させて両液圧ジャッキの牽
引力が等しくなるように自動的に伸縮して間隔の変化を
吸収するので、進路の変化に則して後方台車を安定に牽
引することができる。According to the present invention, there is provided a traction device for pulling a rear bogie to an excavator main body, two hydraulic jacks connected to the excavator main body and the rear bogie at horizontally separated positions, and the two hydraulic jacks. Hydraulic communication means is provided to communicate between the hydraulic chambers on the bottom side and the hydraulic chambers on the rod side of the hydraulic jacks, and the hydraulic pressures on the hydraulic chambers on the bottom side and on the rod side of both hydraulic jacks are made equal. The hydraulic fluid is moved so that both hydraulic jacks automatically expand and contract so that the traction force of both hydraulic jacks becomes equal, and absorb the change in distance, so that the rear bogie can be stably towed according to the change in course. it can.
【図１】本発明になるシールド掘進機による掘進状態を
示す平面図である。FIG. 1 is a plan view showing a state of excavation by a shield excavator according to the present invention.
【図２】本発明になるシールド掘進機における後方台車
牽引装置の横断平面図である。FIG. 2 is a cross-sectional plan view of the rear bogie traction device in the shield machine according to the present invention.
【図３】本発明になるシールド掘進機における油圧系統
図である。FIG. 3 is a hydraulic system diagram of the shield machine according to the present invention.
【図４】本発明になるシールド掘進機における牽引装置
作動状態説明のための横断平面図である。FIG. 4 is a cross-sectional plan view for explaining an operation state of the traction device in the shield machine according to the present invention.
【図５】本発明になるシールド掘進機における牽引装置
作動状態説明のための横断平面図である。FIG. 5 is a cross-sectional plan view for explaining an operation state of the traction device in the shield machine according to the present invention.
２…掘進機本体、８…後方台車、１０…牽引装置、１
２，１３…油圧ジャッキ、１６，１７…連通管、１８…
油圧制御装置。2 ... excavator body, 8 ... rear bogie, 10 ... traction device, 1
2, 13 ... hydraulic jack, 16, 17 ... communication pipe, 18 ...
Hydraulic control device.
Claims (2)
して連結される後方台車を備えたシールド掘進機におい
て、 前記牽引装置は、水平方向に離れた位置で掘進機本体と
後方台車に連結する２本の液圧ジャッキと、該２本の液
圧ジャッキのボトム側液圧室同志及びロッド側液圧室同
志を連通する液圧連通手段を備えたことを特徴とするシ
ールド掘進機。1. A shield machine comprising an excavator main body and a rear bogie connected to the excavator main body via a traction device, wherein the traction device is horizontally separated from the excavator main body and the rear bogie. A hydraulic excavator, comprising: two hydraulic jacks connected to the hydraulic jacks; and hydraulic communication means communicating the bottom hydraulic chambers and the rod hydraulic chambers of the two hydraulic jacks. .
圧連通手段に連通する液圧制御手段を備えたことを特徴
とするシールド掘進機。2. The shield machine according to claim 1, wherein the traction device includes a hydraulic control unit communicating with the hydraulic communication unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05323967A JP3119058B2 (en) | 1993-12-22 | 1993-12-22 | Shield machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05323967A JP3119058B2 (en) | 1993-12-22 | 1993-12-22 | Shield machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07180476A JPH07180476A (en) | 1995-07-18 |
| JP3119058B2 true JP3119058B2 (en) | 2000-12-18 |
Family
ID=18160636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05323967A Expired - Fee Related JP3119058B2 (en) | 1993-12-22 | 1993-12-22 | Shield machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3119058B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100493485B1 (en) * | 1999-11-08 | 2005-06-02 | 주식회사 특수건설 | A tunnel constructing method |
| JP6173167B2 (en) * | 2013-10-29 | 2017-08-02 | 株式会社奥村組 | Shield machine |
| KR102248179B1 (en) * | 2014-09-25 | 2021-05-04 | 삼성중공업 주식회사 | Skid apparatus |
| JP6550942B2 (en) * | 2015-06-10 | 2019-07-31 | 株式会社大林組 | Segment unloading method and segment unloading device |
| JP6898833B2 (en) * | 2017-11-14 | 2021-07-07 | 株式会社奥村組 | Shield digger and how to dig a shield digger |
| JP7162838B2 (en) * | 2019-01-18 | 2022-10-31 | 大成建設株式会社 | Trailing bogie traction system |
-
1993
- 1993-12-22 JP JP05323967A patent/JP3119058B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07180476A (en) | 1995-07-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3140745A (en) | Means for steering a tractor by varying the point of load application to a transverse tow bar supported by the tractor | |
| US5191952A (en) | Track-type vehicle having steerable wheels | |
| CA2599624C (en) | Articulated work vehicle steering system with controlled steering cushioning and associated method | |
| US20080202111A1 (en) | Load sense boost device | |
| JP3119058B2 (en) | Shield machine | |
| US4685527A (en) | System for powering a trailer | |
| US20030196565A1 (en) | Rail puller including a clamping beam and two clamping members and a method thereof | |
| JP4416713B2 (en) | Railroad work machine | |
| JP2648204B2 (en) | Tracked vehicle | |
| ITRM970247A1 (en) | HYDRAULIC POWER STEERING | |
| US9340954B2 (en) | Regenerative circuit for articulated joint | |
| US3670822A (en) | Implement load transfer | |
| JP2002308166A (en) | Method and device for finding tension in a slack side or crawler of earth-moving machine | |
| US6041870A (en) | Method and apparatus for steering a dozing machine | |
| EP2367713B1 (en) | Lock apparatus for variable gauge undercarriage | |
| EP2055509B1 (en) | Suspension system having hydraulic equalizer bar control | |
| US6382075B1 (en) | Snubbing arrangement for a fluid cylinder assembly | |
| US3390735A (en) | Steering systems for vehicles with two steerable tractor units | |
| JP4250039B2 (en) | Lock pin insertion detection device for crawler vehicle | |
| US20090078511A1 (en) | Brake Mechanism for a Caster Wheel on a Offset Rotary Mower | |
| KR101662441B1 (en) | a Forced steering apparatus for having the dislocation correction function, railroad cars | |
| DE3728477C2 (en) | ||
| US4174012A (en) | Self-propelled unit with a high-clearance chassis vehicle | |
| NL2031410B1 (en) | A hydraulic system, a vehicle and a method for operating a hydraulic system | |
| US10858799B2 (en) | Tool stabilizer system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |