JP2003293400A - Hydraulic circuit of hydraulic excavator - Google Patents
Hydraulic circuit of hydraulic excavatorInfo
- Publication number
- JP2003293400A JP2003293400A JP2002101709A JP2002101709A JP2003293400A JP 2003293400 A JP2003293400 A JP 2003293400A JP 2002101709 A JP2002101709 A JP 2002101709A JP 2002101709 A JP2002101709 A JP 2002101709A JP 2003293400 A JP2003293400 A JP 2003293400A
- Authority
- JP
- Japan
- Prior art keywords
- hydraulic
- pressure
- shuttle valve
- valve
- crane
- 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
Landscapes
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
- Jib Cranes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は油圧ショベルの油圧
回路に関するものであり、特に、スイッチ操作にてショ
ベル仕様とクレーン仕様とに切り替え可能な油圧ショベ
ルの油圧回路に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic circuit of a hydraulic excavator, and more particularly to a hydraulic circuit of a hydraulic excavator which can be switched between a shovel specification and a crane specification by a switch operation.
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】スイッ
チ操作にてショベル仕様とクレーン仕様とに切り替え可
能な油圧ショベルは知られている。此種油圧ショベルで
は、スイッチ操作にてクレーン仕様に切り替えたとき
は、エンジンの回転数を極端に下降させて油圧ポンプの
吐出量を減少し、旋回モータの回転を低回転にして安全
な旋回速度を確保するように制御している。しかし、旋
回モータが低回転になるだけではなく、他のアクチュエ
ータの作動速度も遅くなるため、作業性が著しく悪くな
る。2. Description of the Related Art A hydraulic excavator capable of switching between a shovel specification and a crane specification by a switch operation is known. In this type of hydraulic excavator, when switching to crane specifications by switch operation, the engine speed is drastically reduced to reduce the discharge amount of the hydraulic pump, and the rotation motor is rotated at a low speed to achieve a safe rotation speed. Are controlled to ensure. However, not only is the rotation motor rotated at a low speed, but the operating speed of the other actuators is also reduced, resulting in a marked deterioration in workability.
【０００３】そこで、スイッチ操作にてショベル仕様と
クレーン仕様とに切り替え可能な油圧ショベルに於い
て、クレーン仕様に切り替えた状態では旋回操作時のみ
作動速度を抑止して安全性を確保し、他の操作時は通常
の作業速度にして作業性を向上させるために解決すべき
技術的課題が生じてくるのであり、本発明はこの課題を
解決することを目的とする。Therefore, in a hydraulic excavator which can be switched between a shovel specification and a crane specification by a switch operation, in a state where the specification is switched to the crane specification, the operating speed is suppressed only during a turning operation to ensure safety, Since a technical problem to be solved occurs in order to improve the workability at the normal working speed during operation, the present invention aims to solve this problem.
【０００４】[0004]
【課題を解決するための手段】本発明は上記目的を達成
するために提案されたものであり、スイッチ操作にてシ
ョベル仕様とクレーン仕様とに切り替え可能な油圧ショ
ベルに於いて、油圧ポンプの吐出量を変更する手段と、
旋回操作を検出する手段とを備え、前記スイッチ操作に
てクレーン仕様に切り替えた状態では、前記油圧ポンプ
の吐出量をショベル仕様と同じ大流量に設定し、旋回操
作を検出したときは、前記油圧ポンプの吐出量を小流量
に変更するような制御手段を備えた油圧ショベルの油圧
回路、及び、上記油圧ポンプの吐出量を変更する手段
は、ポンプ傾転角を変更させるための油圧シリンダと、
油圧源からの圧油とネガコン油路からの圧油とを高圧選
択して前記油圧シリンダに導入させるシャトル弁とから
なり、更に、前記油圧源とシャトル弁との間に電磁切り
替え弁を設け、旋回操作を検出したときは、上記制御手
段の指令信号により前記電磁切り替え弁を開いて油圧源
からの圧油をシャトル弁を介して前記油圧シリンダに導
入させることにより、前記油圧ポンプの吐出量を小流量
に変更するように構成された油圧ショベルの油圧回路を
提供するものである。DISCLOSURE OF THE INVENTION The present invention has been proposed in order to achieve the above object, and in a hydraulic excavator which can be switched between a shovel specification and a crane specification by a switch operation, a discharge of a hydraulic pump. Means to change the amount,
A means for detecting a turning operation is provided, and when the switch operation is switched to the crane specification, the discharge amount of the hydraulic pump is set to the same large flow rate as the shovel specification. The hydraulic circuit of the hydraulic excavator provided with a control means for changing the discharge amount of the pump to a small flow rate, and the means for changing the discharge amount of the hydraulic pump are a hydraulic cylinder for changing the pump tilt angle,
It is composed of a shuttle valve for selecting a high pressure of the pressure oil from the hydraulic source and the pressure oil from the negative control oil passage and introducing it into the hydraulic cylinder, and further, an electromagnetic switching valve is provided between the hydraulic source and the shuttle valve, When a turning operation is detected, the electromagnetic switching valve is opened by a command signal of the control means to introduce pressure oil from a hydraulic pressure source into the hydraulic cylinder via a shuttle valve, thereby changing the discharge amount of the hydraulic pump. A hydraulic circuit of a hydraulic excavator configured to change to a small flow rate.
【０００５】[0005]
【発明の実施の形態】以下、本発明の一実施の形態を図
面に従って詳述する。図１に示すように、可変容量型の
油圧ポンプ１１の吐出油路１２には各アクチュエータ用
のコントロール弁１３，１４，１５が設けられている。
この中で旋回モータ１６用のコントロール弁１４につい
て説明すれば、旋回モータ１６用のリモコン弁１７を操
作することにより、前記コントロール弁１４のスプール
が切り替わって、前記油圧ポンプ１１から吐出された圧
油が旋回モータ１６に供給され、該旋回モータ１６が左
右何れかの方向へ回転する。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the drawings. As shown in FIG. 1, the discharge oil passage 12 of the variable displacement hydraulic pump 11 is provided with control valves 13, 14, 15 for each actuator.
The control valve 14 for the swing motor 16 will be described below. By operating the remote control valve 17 for the swing motor 16, the spool of the control valve 14 is switched and the pressure oil discharged from the hydraulic pump 11 is switched. Is supplied to the turning motor 16, and the turning motor 16 rotates in either the left or right direction.
【０００６】前記リモコン弁１７の二次側油路１８，１
９はシャトル弁２０を介して接続されており、該シャト
ル弁２０の出口油路に圧力スイッチ２１を設置する。前
記リモコン弁１７を左右何れかの方向へ操作した場合
は、シャトル弁２０にてどちらかのパイロット圧が高圧
選択されて圧力スイッチ２１がオンとなる。従って、制
御手段であるコントローラ２２は、該圧力スイッチ２１
のオン信号により旋回用のリモコン弁１７が操作された
ことを判別できる。これらシャトル弁２０と圧力スイッ
チ２１とで旋回操作を検出する手段が構成される。Secondary side oil passages 18, 1 of the remote control valve 17
9 is connected via a shuttle valve 20, and a pressure switch 21 is installed in the outlet oil passage of the shuttle valve 20. When the remote control valve 17 is operated to the left or right, either of the pilot pressures is selected by the shuttle valve 20 to be a high pressure, and the pressure switch 21 is turned on. Therefore, the controller 22 which is the control means is
It is possible to determine that the turning remote control valve 17 has been operated by the ON signal. The shuttle valve 20 and the pressure switch 21 constitute a means for detecting a turning operation.
【０００７】一方、前記油圧ポンプ１１は可変容量型で
あり、油圧シリンダ２３の伸縮によりポンプ傾転角を変
えて吐出量を増減することができる。該油圧シリンダ２
３には、油圧源２４からの圧油とネガコン油路２５から
の圧油との何れか一方を高圧選択して導入させるシャト
ル弁２６が接続されており、前記油圧シリンダ２３とシ
ャトル弁２６とで油圧ポンプ１１の吐出量を変更する手
段が構成される。On the other hand, the hydraulic pump 11 is a variable displacement type, and the expansion and contraction of the hydraulic cylinder 23 can change the pump tilt angle to increase or decrease the discharge amount. The hydraulic cylinder 2
3 is connected to a shuttle valve 26 for selecting and introducing high pressure one of the pressure oil from the hydraulic power source 24 and the pressure oil from the negative control oil passage 25. The shuttle valve 26 is connected to the hydraulic cylinder 23 and the shuttle valve 26. Is a means for changing the discharge amount of the hydraulic pump 11.
【０００８】更に、前記油圧源２４とシャトル弁２６と
の間には減圧弁２７と電磁切り替え弁２８を設け、前記
油圧源２４からの圧油が減圧弁２７にて所定圧に減圧さ
れた後に、電磁切り替え弁２８が開放されたときにシャ
トル弁２６を介して油圧シリンダ２３に導入されるよう
に形成してある。図１に示したように、油圧シリンダ２
３に圧油が導入されずピストンロッドが引き込まれた状
態だと、前記油圧ポンプ１１の傾転角が大となって吐出
量が大流量の状態となる。Further, a pressure reducing valve 27 and an electromagnetic switching valve 28 are provided between the hydraulic pressure source 24 and the shuttle valve 26, and the pressure oil from the hydraulic pressure source 24 is reduced to a predetermined pressure by the pressure reducing valve 27. When the electromagnetic switching valve 28 is opened, it is introduced into the hydraulic cylinder 23 via the shuttle valve 26. As shown in FIG. 1, the hydraulic cylinder 2
When the piston rod is pulled in without pressure oil being introduced into 3, the tilt angle of the hydraulic pump 11 becomes large and the discharge amount becomes a large flow amount.
【０００９】尚、符号２９はショベル仕様からクレーン
仕様へ切り替えるため切り替えスイッチであり、実線で
図示したように該切り替えスイッチ２９がオフであると
きは、前記コントローラ２２がショベル仕様であると判
別し、鎖線で示すように該切り替えスイッチ２９がオン
であるときは、前記コントローラ２２がクレーン仕様に
切り替わったと判別する。そして、該切り替えスイッチ
２９をオンしてクレーン仕様に切り替えたときは、従来
のようにエンジン（図示せず）の回転数を極端に下降さ
せることはせずに、後述するように、旋回操作の有無を
検出して安全な旋回速度を確保するように制御する。Reference numeral 29 is a changeover switch for changing from the shovel specification to the crane specification. When the changeover switch 29 is off as shown by the solid line, it is determined that the controller 22 is the shovel specification. When the changeover switch 29 is on, as indicated by the chain line, it is determined that the controller 22 has switched to the crane specifications. Then, when the changeover switch 29 is turned on to switch to the crane specification, the rotation speed of the engine (not shown) is not extremely lowered as in the conventional case, but the turning operation is performed as described later. The presence / absence is detected and controlled to ensure a safe turning speed.
【００１０】切り替えスイッチ２９をオンしてクレーン
仕様に切り替えた状態で旋回操作をしなければ、前記電
磁切り替え弁２８は図示した位置のままであるため、前
記油圧源２４からの圧油は電磁切り替え弁２８で遮断さ
れてシャトル弁２６に導出されない。従って、前記油圧
ポンプ１１の傾転角はショベル仕様と同じ大であり、油
圧ポンプ１１の吐出量が大流量の状態に設定される。If the turning operation is not performed in the state where the changeover switch 29 is turned on to switch to the crane specifications, the electromagnetic switching valve 28 remains in the position shown in the figure, so that the pressure oil from the hydraulic power source 24 is electromagnetically switched. It is blocked by the valve 28 and is not led out to the shuttle valve 26. Therefore, the tilt angle of the hydraulic pump 11 is as large as that of the shovel specification, and the discharge amount of the hydraulic pump 11 is set to a large flow rate state.
【００１１】ここで、図２に示すように、前記切り替え
スイッチ２９をオンしてクレーン仕様の状態のもとで、
機体を旋回させるべく旋回用リモコン弁１７を例えば左
側へ操作したときは、二次側油路１８にパイロット圧が
導出されて旋回用のコントロール弁１４が左位置に切り
替わり、前記油圧ポンプ１１から吐出された圧油が旋回
モータ１６に供給されて、旋回モータ１６が回転するた
め機体が左旋回する。Here, as shown in FIG. 2, under the condition of the crane specifications by turning on the changeover switch 29,
When the turning remote control valve 17 is operated to the left, for example, to turn the machine body, pilot pressure is derived to the secondary side oil passage 18, the turning control valve 14 is switched to the left position, and the hydraulic pump 11 discharges. The pressure oil thus generated is supplied to the turning motor 16, and the turning motor 16 rotates, so that the machine body turns to the left.
【００１２】このとき、前記二次側油路１８のパイロッ
ト圧がシャトル弁２０を介して圧力スイッチ２１をオン
するため、コントローラ２２は旋回操作があったことを
検出し、該コントローラ２２から前記電磁切り替え弁２
８のソレノイドへ信号が出力されて、電磁切り替え弁２
８が図示したように開放位置に切り替わる。従って、前
記油圧源２４からの圧油が減圧弁２７にて所定圧に減圧
された後に、この電磁切り替え弁２８を通過してシャト
ル弁２６へ送られ、該シャトル弁２６にて油圧源からの
圧油とネガコン油路２５からの圧油とを高圧選択して油
圧シリンダ２３に導入させる。At this time, since the pilot pressure in the secondary side oil passage 18 turns on the pressure switch 21 via the shuttle valve 20, the controller 22 detects that a turning operation has been performed, and the controller 22 causes the electromagnetic switch to move. Switching valve 2
A signal is output to the solenoid 8 and the solenoid switching valve 2
8 switches to the open position as shown. Therefore, after the pressure oil from the hydraulic pressure source 24 is reduced to a predetermined pressure by the pressure reducing valve 27, it passes through the electromagnetic switching valve 28 and is sent to the shuttle valve 26. The pressure oil and the pressure oil from the negative control oil passage 25 are selected at high pressure and introduced into the hydraulic cylinder 23.
【００１３】依って、油圧シリンダ２３のピストンロッ
ドが押し出され、前記油圧ポンプ１１の傾転角が小とな
って吐出量が小流量の状態となる。即ち、クレーン仕様
の状態のもとで、コントローラ２２が旋回操作を検出し
たときは、該コントローラ２２の制御によって油圧ポン
プ１１の吐出量が小流量に変更される。このため、旋回
モータ１６への圧油の供給量が減少して旋回モータ１６
の回転が低回転となり、クレーン作業に適した安全な旋
回速度を確保することができる。As a result, the piston rod of the hydraulic cylinder 23 is pushed out, the tilt angle of the hydraulic pump 11 becomes small, and the discharge amount becomes small. That is, when the controller 22 detects a turning operation under the crane specifications, the discharge amount of the hydraulic pump 11 is changed to a small flow rate by the control of the controller 22. For this reason, the amount of pressure oil supplied to the swing motor 16 decreases, and the swing motor 16
The rotation speed is low, and a safe turning speed suitable for crane work can be secured.
【００１４】これに対して、図３に示すように、前記切
り替えスイッチ２９をオンしてクレーン仕様の状態のも
とで、旋回モータ１６ではなく例えばブームシリンダ
等、他のアクチュエータ３０を操作すべくコントロール
弁１３を切り替えた場合は、前記シャトル弁２０にパイ
ロット圧が導出されないため圧力スイッチ２１はオフと
なる。このため、コントローラ２２から前記電磁切り替
え弁２８のソレノイドへ信号が出力されず、電磁切り替
え弁２８が図示したように閉止位置を保持する。前記油
圧源２４からの圧油は電磁切り替え弁２８で遮断されて
シャトル弁２６に導出されない。従って、前記油圧ポン
プ１１の傾転角は大であり、油圧ポンプ１１の吐出量が
大流量の状態に設定される。On the other hand, as shown in FIG. 3, under the condition of the crane specifications by turning on the changeover switch 29, not the swing motor 16 but another actuator 30 such as a boom cylinder is operated. When the control valve 13 is switched, the pilot pressure is not led to the shuttle valve 20, so the pressure switch 21 is turned off. Therefore, no signal is output from the controller 22 to the solenoid of the electromagnetic switching valve 28, and the electromagnetic switching valve 28 maintains the closed position as illustrated. The pressure oil from the hydraulic pressure source 24 is blocked by the electromagnetic switching valve 28 and is not led to the shuttle valve 26. Therefore, the tilt angle of the hydraulic pump 11 is large, and the discharge amount of the hydraulic pump 11 is set to a large flow rate.
【００１５】斯くして、他のアクチュエータ３０への圧
油の供給量が増加し、クレーン仕様でありながらショベ
ル仕様と同様の速い作業速度が得られるため、作業性が
著しく向上する。尚、図示は省略するが、油圧ポンプ自
体に最大吐出量制限ポートを設け、電磁弁を切り替えて
パイロット圧を作用させる構成であっても同様の作用効
果を得ることができる。Thus, the amount of pressure oil supplied to the other actuators 30 is increased, and a high working speed similar to that of the shovel specification can be obtained even with the crane specification, so that the workability is remarkably improved. Although not shown, the same operation and effect can be obtained even if the hydraulic pump itself is provided with a maximum discharge amount restriction port and the solenoid valve is switched to apply the pilot pressure.
【００１６】而して、本発明は、本発明の精神を逸脱し
ない限り種々の改変を為すことができ、そして、本発明
が該改変されたものに及ぶことは当然である。Therefore, the present invention can be variously modified without departing from the spirit of the present invention, and it is obvious that the present invention extends to the modified one.
【００１７】[0017]
【発明の効果】本発明は上記一実施の形態に詳述したよ
うに、請求項１記載の発明は、スイッチ操作にてクレー
ン仕様に切り替えた状態では、油圧ポンプの吐出量をシ
ョベル仕様と同じ大流量に設定し、旋回操作を検出した
ときは、前記油圧ポンプの吐出量を小流量に変更するよ
うに制御するので、旋回以外の作業時は油圧ポンプの吐
出量が大流量となり、クレーン仕様でありながらショベ
ル仕様と同様の速い作業速度が得られて作業性が著しく
向上する。そして、旋回時は油圧ポンプの吐出量が小流
量に変更され、旋回モータの回転が低回転となるため、
クレーン作業に適した安全な旋回速度を確保することが
できる。As described in detail in the above one embodiment of the present invention, in the invention according to claim 1, the discharge amount of the hydraulic pump is the same as that of the shovel specification when the crane specification is switched by the switch operation. When a large flow rate is set and a turning operation is detected, the discharge rate of the hydraulic pump is controlled to change to a small flow rate, so the discharge rate of the hydraulic pump becomes a large flow rate during work other than turning, and the crane specifications However, the same high working speed as that of the shovel specification can be obtained and workability is significantly improved. Then, at the time of turning, the discharge amount of the hydraulic pump is changed to a small flow rate, and the rotation of the turning motor becomes low,
A safe turning speed suitable for crane work can be secured.
【００１８】また、請求項２記載の発明は、上記油圧ポ
ンプの吐出量を変更する手段は、ポンプ傾転角を変更さ
せるための油圧シリンダとシャトル弁とからなり、上記
制御手段の指令信号により油圧源からの圧油がシャトル
弁を介して前記油圧シリンダに導入されるので、旋回操
作を検出したときは前記油圧ポンプの吐出量が小流量と
なるため、請求項１記載の発明の効果に加えて、旋回速
度を自動的且つ確実に低下させることができ、安全性並
びに作業性の向上に寄与できる等、正に諸種の効果を奏
する発明である。According to the second aspect of the present invention, the means for changing the discharge amount of the hydraulic pump comprises a hydraulic cylinder for changing the pump tilt angle and a shuttle valve, and a command signal from the control means is used. Since the pressure oil from the hydraulic pressure source is introduced into the hydraulic cylinder via the shuttle valve, the discharge amount of the hydraulic pump becomes a small flow rate when the turning operation is detected. In addition, the invention is capable of reducing the turning speed automatically and surely, contributing to the improvement of safety and workability, and the like, and is an invention that exhibits various kinds of effects.
図は本発明の一実施の形態を示すものである。 The figure shows an embodiment of the present invention.
【図１】ショベル仕様状態の油圧回路図。FIG. 1 is a hydraulic circuit diagram of a shovel specification state.
【図２】クレーン仕様状態で旋回操作中の油圧回路図。FIG. 2 is a hydraulic circuit diagram during a turning operation in a crane specification state.
【図３】クレーン仕様状態で旋回以外の操作中の油圧回
路図。FIG. 3 is a hydraulic circuit diagram in a crane specification state during operations other than turning.
１１ 油圧ポンプ １６ 旋回モータ １７ リモコン弁 ２０ シャトル弁 ２１ 圧力スイッチ ２２ コントローラ ２３ 油圧シリンダ ２４ 油圧源 ２５ ネガコン油路 ２６ シャトル弁 ２８ 電磁切り替え弁 ２９ 切り替えスイッチ 11 hydraulic pump 16 swing motor 17 Remote control valve 20 shuttle valve 21 Pressure switch 22 Controller 23 Hydraulic cylinder 24 hydraulic power source 25 Negacon Oilway 26 Shuttle valve 28 Electromagnetic switching valve 29 Changeover switch
フロントページの続き Ｆターム(参考） 2D003 AA01 AB02 AB05 AC07 AC11 BA02 BB02 CA03 DA03 DA04 DB02 3F205 AA05 AA20 EA07 3H089 AA43 AA75 BB15 BB17 BB19 CC01 CC08 CC11 DA03 DB13 DB32 EE12 EE14 EE22 EE31 FF07 FF13 GG02 JJ02 JJ08Continued front page F term (reference) 2D003 AA01 AB02 AB05 AC07 AC11 BA02 BB02 CA03 DA03 DA04 DB02 3F205 AA05 AA20 EA07 3H089 AA43 AA75 BB15 BB17 BB19 CC01 CC08 CC11 DA03 DB13 DB32 EE12 EE14 EE22 EE31 FF07 FF13 GG02 JJ02 JJ08
Claims (2)
ン仕様とに切り替え可能な油圧ショベルに於いて、油圧
ポンプの吐出量を変更する手段と、旋回操作を検出する
手段とを備え、前記スイッチ操作にてクレーン仕様に切
り替えた状態では、前記油圧ポンプの吐出量をショベル
仕様と同じ大流量に設定し、旋回操作を検出したとき
は、前記油圧ポンプの吐出量を小流量に変更するような
制御手段を備えたことを特徴とする油圧ショベルの油圧
回路。1. A hydraulic excavator capable of switching between a shovel specification and a crane specification by a switch operation, comprising means for changing a discharge amount of a hydraulic pump, and means for detecting a turning operation. Control means for setting the discharge rate of the hydraulic pump to the same large flow rate as the shovel specification in the state of switching to the crane specification, and changing the discharge rate of the hydraulic pump to a small flow rate when a turning operation is detected. A hydraulic circuit for a hydraulic excavator, which is equipped with.
は、ポンプ傾転角を変更させるための油圧シリンダと、
油圧源からの圧油とネガコン油路からの圧油とを高圧選
択して前記油圧シリンダに導入させるシャトル弁とから
なり、更に、前記油圧源とシャトル弁との間に電磁切り
替え弁を設け、旋回操作を検出したときは、上記制御手
段の指令信号により前記電磁切り替え弁を開いて油圧源
からの圧油をシャトル弁を介して前記油圧シリンダに導
入させることにより、前記油圧ポンプの吐出量を小流量
に変更するように構成された請求項１記載の油圧ショベ
ルの油圧回路。2. The means for changing the discharge amount of the hydraulic pump includes a hydraulic cylinder for changing the pump tilt angle,
It is composed of a shuttle valve for selecting a high pressure of the pressure oil from the hydraulic source and the pressure oil from the negative control oil passage and introducing it into the hydraulic cylinder, and further, an electromagnetic switching valve is provided between the hydraulic source and the shuttle valve, When a turning operation is detected, the electromagnetic switching valve is opened by a command signal of the control means to introduce pressure oil from a hydraulic pressure source into the hydraulic cylinder via a shuttle valve, thereby changing the discharge amount of the hydraulic pump. The hydraulic circuit of the hydraulic excavator according to claim 1, wherein the hydraulic circuit is configured to change to a small flow rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002101709A JP3786891B2 (en) | 2002-04-03 | 2002-04-03 | Hydraulic circuit of excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002101709A JP3786891B2 (en) | 2002-04-03 | 2002-04-03 | Hydraulic circuit of excavator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003293400A true JP2003293400A (en) | 2003-10-15 |
| JP3786891B2 JP3786891B2 (en) | 2006-06-14 |
Family
ID=29241933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002101709A Expired - Fee Related JP3786891B2 (en) | 2002-04-03 | 2002-04-03 | Hydraulic circuit of excavator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3786891B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005330674A (en) * | 2004-05-19 | 2005-12-02 | Sumitomo (Shi) Construction Machinery Manufacturing Co Ltd | Hydraulic circuit for crane hydraulic shovel |
| JP2007070913A (en) * | 2005-09-08 | 2007-03-22 | Shin Caterpillar Mitsubishi Ltd | Hydraulic shovel with crane specifications |
| EP2418390A1 (en) * | 2009-09-04 | 2012-02-15 | Caterpillar SARL | Hydraulic control device of operating machine |
| EP2589822A1 (en) * | 2010-06-30 | 2013-05-08 | Volvo Construction Equipment AB | Control device for a hydraulic pump of construction machinery |
| CN103244477A (en) * | 2013-05-15 | 2013-08-14 | 无锡市钻通工程机械有限公司 | Hydraulic control system of intelligent brake of drilling machine |
| CN103644215A (en) * | 2013-11-06 | 2014-03-19 | 桂林市华力重工机械有限责任公司 | Intelligent hydraulic braking system of full-hydraulic crawler-type cutting drill |
| JP2016166512A (en) * | 2015-03-10 | 2016-09-15 | 住友建機株式会社 | Shovel |
-
2002
- 2002-04-03 JP JP2002101709A patent/JP3786891B2/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005330674A (en) * | 2004-05-19 | 2005-12-02 | Sumitomo (Shi) Construction Machinery Manufacturing Co Ltd | Hydraulic circuit for crane hydraulic shovel |
| JP2007070913A (en) * | 2005-09-08 | 2007-03-22 | Shin Caterpillar Mitsubishi Ltd | Hydraulic shovel with crane specifications |
| JP4700447B2 (en) * | 2005-09-08 | 2011-06-15 | キャタピラー エス エー アール エル | Hydraulic excavator with crane specification |
| EP2418390A4 (en) * | 2009-09-04 | 2013-08-21 | Caterpillar Sarl | Hydraulic control device of operating machine |
| EP2418390A1 (en) * | 2009-09-04 | 2012-02-15 | Caterpillar SARL | Hydraulic control device of operating machine |
| US8899035B2 (en) | 2009-09-04 | 2014-12-02 | Caterpillar Sarl | Hydraulic control apparatus for work machine |
| EP2589822A1 (en) * | 2010-06-30 | 2013-05-08 | Volvo Construction Equipment AB | Control device for a hydraulic pump of construction machinery |
| EP2589822A4 (en) * | 2010-06-30 | 2014-05-14 | Volvo Constr Equip Ab | Control device for a hydraulic pump of construction machinery |
| US9309899B2 (en) | 2010-06-30 | 2016-04-12 | Volvo Construction Equipment Ab | Control device for a hydraulic pump of construction machinery |
| CN103244477A (en) * | 2013-05-15 | 2013-08-14 | 无锡市钻通工程机械有限公司 | Hydraulic control system of intelligent brake of drilling machine |
| CN103244477B (en) * | 2013-05-15 | 2017-02-08 | 无锡市钻通工程机械有限公司 | Hydraulic control system of intelligent brake of drilling machine |
| CN103644215A (en) * | 2013-11-06 | 2014-03-19 | 桂林市华力重工机械有限责任公司 | Intelligent hydraulic braking system of full-hydraulic crawler-type cutting drill |
| JP2016166512A (en) * | 2015-03-10 | 2016-09-15 | 住友建機株式会社 | Shovel |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3786891B2 (en) | 2006-06-14 |
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