WO2014123254A1 - 유압식 건설기계 - Google Patents
유압식 건설기계 Download PDFInfo
- Publication number
- WO2014123254A1 WO2014123254A1 PCT/KR2013/000952 KR2013000952W WO2014123254A1 WO 2014123254 A1 WO2014123254 A1 WO 2014123254A1 KR 2013000952 W KR2013000952 W KR 2013000952W WO 2014123254 A1 WO2014123254 A1 WO 2014123254A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- hydraulic
- hydraulic pump
- control valve
- motor
- supplied
- 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.)
- Ceased
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2292—Systems with two or more pumps
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/08—Superstructures; Supports for superstructures
- E02F9/10—Supports for movable superstructures mounted on travelling or walking gears or on other superstructures
- E02F9/12—Slewing or traversing gears
- E02F9/121—Turntables, i.e. structure rotatable about 360°
- E02F9/123—Drives or control devices specially adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/2025—Particular purposes of control systems not otherwise provided for
- E02F9/2029—Controlling the position of implements in function of its load, e.g. modifying the attitude of implements in accordance to vehicle speed
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2221—Control of flow rate; Load sensing arrangements
- E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance
- E02F9/2242—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance including an electronic controller
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
- E02F9/2267—Valves or distributors
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2282—Systems using center bypass type changeover valves
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2296—Systems with a variable displacement pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20576—Systems with pumps with multiple pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/3056—Assemblies of multiple valves
- F15B2211/3059—Assemblies of multiple valves having multiple valves for multiple output members
- F15B2211/30595—Assemblies of multiple valves having multiple valves for multiple output members with additional valves between the groups of valves for multiple output members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
- F15B2211/7058—Rotary output members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
- F15B2211/7142—Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being arranged in multiple groups
Definitions
- the present invention relates to a hydraulic construction machine, and more specifically, to operate the traveling device and the swinging device at the same time to operate the combined operation by the operating oil supplied from the plurality of hydraulic pumps at the maximum discharge flow rate respectively It relates to a hydraulic construction machine.
- a variable displacement first hydraulic pump (hereinafter referred to as a first hydraulic pump) 1 and a variable displacement second hydraulic pump (hereinafter referred to as a second hydraulic pump) 2 operated by an engine (not shown) or the like;
- Hydraulic actuators (5, 6, 7) operated by hydraulic oil supplied from the second hydraulic pump (2);
- It is installed in the supply flow path (8) of the first hydraulic pump (1), and when switching the hydraulic oil flow direction supplied to the traveling motor (3) and the turning motor (4) from the first hydraulic pump (1) It is installed in the first control valve (9, 10) and the supply flow path (11) of the second hydraulic pump (2), and is supplied from the second hydraulic pump (2) to the hydraulic actuator (5, 6, 7) at the time of switching It includes a main control valve 15 (MCV) including a second control valve (12, 13, 14) for controlling the hydraulic oil flow direction.
- MCV main control valve 15
- the control signal When operating the travel pedal for driving, the control signal according to the operation switches the spool of the first control valve 9 in the left or right direction, so that the hydraulic oil from the first hydraulic pump 1 Is supplied to the traveling motor 3 through the spool of the first control valve 9 along the supply passage 8. This makes it possible to operate driving alone. As described above, when the equipment is turned or driven alone, the flow rate supplied at the maximum discharge flow rate from the first hydraulic pump 1 can be used.
- the maximum discharge flow rate from the first hydraulic pump 1 is distributed and supplied to the traveling motor 3 and the swinging motor 4, respectively.
- the work efficiency decreases due to the deceleration of the operating speed of the driving motor 3 and the turning motor 4, and the driving speed and the turning speed suddenly decelerate during driving or working, so that the decelerated speed is transmitted as a shock to the driver while driving to increase fatigue.
- a variable displacement first hydraulic pump (hereinafter referred to as a first hydraulic pump) 1 and a variable displacement second hydraulic pump (hereinafter referred to as a second hydraulic pump) 2 operated by an engine (not shown) or the like;
- Hydraulic actuators (5, 6, 7) operated by hydraulic oil supplied from the second hydraulic pump (2);
- the first hydraulic pump is installed in the supply flow path 8 of the first hydraulic pump 1 and controls the flow direction of the hydraulic oil supplied from the first hydraulic pump 1 to the traveling motor 3 and the turning motor 4 during switching.
- Hydraulic oil flow which is installed in the control valves 9 and 10 and the supply flow path 11 of the 2nd hydraulic pump 2 and is supplied from the 2nd hydraulic pump 2 to the hydraulic actuators 5, 6 and 7 at the time of switching.
- a main control valve 15 (MCV) including a second control valve 12, 13, 14 for controlling the direction;
- control valve 17 When simultaneously operating the traveling motor 3 and the swinging motor 4, the control valve 17 is switched in response to the application of the control signal to close the supply passage 11 of the second hydraulic pump 2 at the most downstream side thereof. It includes.
- the hydraulic oil from the first hydraulic pump 1 is supplied to a relatively low load pressure according to the difference in the load pressure generated between the driving motor 3 and the hydraulic actuators 5, 6, and 7, the second hydraulic pressure
- the hydraulic oil from the pump 2 is supplied to the side where the load pressure is relatively low in accordance with the difference in the load pressure generated between the swing motor 4 and the hydraulic actuators 5, 6, 7.
- the present invention is to solve the above problems, the operating speed of the traveling device and the turning device is lowered by using the maximum discharge flow rate from a plurality of hydraulic pump when operating the traveling device and the turning device at the same time combined operation It is an object of the present invention to provide a hydraulic construction machine that can prevent that.
- the first hydraulic pump and the second hydraulic pump are configured to achieve the above and other objects of the present invention.
- At least one hydraulic actuator operated by hydraulic oil supplied from the second hydraulic pump
- a first control valve for controlling the flow direction of the hydraulic oil supplied from the first hydraulic pump to the traveling motor and the swing motor, and a second control valve for controlling the flow direction of the hydraulic oil supplied from the second hydraulic pump to the hydraulic actuator;
- a main control valve comprising;
- a controller for inputting an operation signal detected by the sensing means whether the driving and turning operation is performed
- the first control valve and the second control valve In the combined operation in which the traveling motor and the turning motor are operated simultaneously according to the operation signal input to the controller, the first control valve and the second control valve generate a control signal corresponding to the electric control signal output from the controller. It provides a hydraulic construction machine comprising an electromagnetic proportional valve for outputting them to switch over.
- the second control valve is
- the internal spool is switched so as to be proportional to the magnitude of the control signal output from the electromagnetic proportional valve to drain a part of the hydraulic oil supplied from the second hydraulic pump to the swing motor to the hydraulic tank. After that, the most downstream side opening is closed by the supply oil of the second hydraulic pump.
- Pressure sensor for detecting whether the control valve for the driving motor to control the hydraulic oil supplied to the traveling motor and the control valve for the turning motor for controlling the hydraulic oil supplied to the swing motor and outputting the detected operation signal to the controller It is characterized in that it is used.
- the first control valve and the second control valve is characterized in that installed in the main control valve.
- the operation speed is improved by preventing the decrease of the operating speed during combined operation compared with the single operation of the traveling or turning device, and the operation and There is an effect that can improve the operability.
- FIG. 2 is a hydraulic circuit diagram of a hydraulic construction machine according to another conventional art
- FIG. 3 is a hydraulic circuit diagram of a hydraulic construction machine according to an embodiment of the present invention.
- FIG. 3 is a hydraulic circuit diagram of a hydraulic construction machine according to an embodiment of the present invention.
- a variable displacement first hydraulic pump (hereinafter referred to as a first hydraulic pump) 1 and a variable displacement second hydraulic pump (hereinafter referred to as a second hydraulic pump) 2 operated by an engine (not shown) or the like;
- a traveling motor 3 (drive motor for driving wheels of a wheel type excavator) and a turning motor 4 operated by hydraulic oil supplied from the first hydraulic pump 1;
- At least one hydraulic actuator (5, 6, 7) operated by hydraulic oil supplied from the second hydraulic pump (2);
- Hydraulic actuator from the first control valve (9, 10) and the second hydraulic pump (2) for controlling the flow direction of the hydraulic oil supplied from the first hydraulic pump (1) to the traveling motor (3) and the swing motor (4)
- a main control valve 15 including second control valves 12, 13, and 14 for controlling the hydraulic oil flow direction supplied to (5, 6, 7);
- a first control valve 18 which supplies hydraulic oil to the traveling motor 3 and supplies hydraulic oil from the second hydraulic pump 2 to the swinging motor 4;
- the second hydraulic pump (1) is installed on the downstream of the supply flow path (8), and when operating the driving motor 3 and the swing motor (4) at the same time is switched according to the application of the control signal to the second hydraulic pump ( A second control valve 19 which closes the most downstream side opening of the supply flow path of 2);
- a controller 20 to which an operation signal sensed by the sensing means 22, for driving and turning operation, is input;
- a control signal generated corresponding to the electrical control signal output from the controller 20 includes an electromagnetic proportional valve 21 for outputting to the first control valve 18 and the second control valve 19 to switch them.
- the second control valve 19 is
- the internal spool is switched to be proportional to the magnitude of the control signal output from the electromagnetic proportional valve 21 so that the swing motor (2) can be rotated from the second hydraulic pump 2. 4) after draining a part of the hydraulic oil supplied to the hydraulic tank T, the opening of the most downstream side of the supply flow path 11 of the second hydraulic pump 2 is closed.
- a pressure sensor for outputting the detected operation signal to the controller 20 may be used.
- the first control valve 18 and the second control valve 19 may be installed in the main control valve 15.
- the signal is output to the controller 20.
- the controller 20 outputs an electrical control signal to the electromagnetic proportional valve 21 when the controller 20 detects a complex operation for simultaneously driving and turning in accordance with the input operation signal.
- the electromagnetic proportional valve 21 generates a secondary control signal corresponding to the electrical control signal output from the controller 20, and the generated secondary control signal is the first control valve 18 and the second control.
- the valve 19 is output to switch them. That is, when the first control valve 18 installed on the most upstream side of the supply flow path 11 of the second hydraulic pump 2 is switched to the left side in the drawing, the hydraulic oil from the first hydraulic pump 1
- the first control valve 9 for the driving motor is passed along the supply flow path 8 to be supplied only to the driving motor 3, and the hydraulic oil from the second hydraulic pump 2 flows along the supply flow path 11. It is supplied only to the turning motor 4 via the control valve 18 and the 1st control valve 10 for turning motors.
- the flow rate supplied from the first hydraulic pump 1 at the maximum discharge flow rate is used to drive the driving motor 3, and the second hydraulic pump 2
- the flow rate supplied at the maximum discharge flow rate from the gas is used to drive the swing motor 4.
- the second control provided on the downstream side of the supply passage 11 of the second hydraulic pump 2 in accordance with the application of the control signal output from the electromagnetic proportional valve 21.
- the spool of the valve 19 is switched to the left in the figure.
- the hydraulic oil from the second hydraulic pump 2 is supplied to the swing motor 4, and the second control valve 19 is proportional to the magnitude of the control signal output from the electromagnetic proportional valve 21.
- the internal spool is switched That is, in the initial stage when the spool of the second control valve 19 is switched by the control signal input from the electromagnetic proportional valve 21, the supply flow path 11 of the second hydraulic pump 2 is opened at the most downstream side. Since it is not completely closed, the hydraulic oil from the second hydraulic pump 2 is supplied to and operated by the swing motor 4, and at the same time, a part of the hydraulic oil from the second hydraulic pump 2 is drained to the hydraulic tank T. You can.
- the maximum flow rate discharged from the first hydraulic pump 1 is supplied only to the traveling motor 3 and the maximum discharged from the second hydraulic pump 2 is performed. Since the flow rate is supplied only to the turning motor 4, it is possible to ensure an operating speed equal to the operating speed when driving or turning alone.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
Claims (4)
- 제1유압펌프 및 제2유압펌프;상기 제1유압펌프로부터 공급되는 작동유에 의해 작동되는 주행모터와 선회모터;상기 제2유압펌프로부터 공급되는 작동유에 의해 작동되는 적어도 하나 이상의 유압 액츄에이터;상기 제1유압펌프로부터 상기 주행모터와 선회모터로 공급되는 작동유 흐름방향을 제어하는 제1컨트롤밸브와, 상기 제2유압펌프로부터 상기 유압 액츄에이터로 공급되는 작동유 흐름방향을 제어하는 제2컨트롤밸브를 포함하는 메인 컨트롤밸브;상기 제2유압펌프의 공급유로 최상류측에 설치되고, 상기 주행모터와 선회모터를 동시에 조작할 경우 제어신호의 인가에 따라 절환되어 상기 제1유압펌프로부터의 작동유를 상기 주행모터에 공급하고, 상기 제2유압펌프로부터의 작동유를 상기 선회모터에 공급하는 제1제어밸브;상기 제2유압펌프의 공급유로 최하류측에 설치되고, 상기 주행모터와 선회모터를 동시에 조작할 경우 제어신호의 인가에 따라 절환되어 상기 제2유압펌프의 공급유로 최하류측 개구부를 닫는 제2제어밸브;주행과 선회 조작여부를 감지수단에 의해 감지한 조작신호가 입력되는 콘트롤러;상기 콘트롤러에 입력된 조작신호에 따라 상기 주행모터와 선회모터가 동시에 조작되는 복합작동일 경우, 상기 콘트롤러로부터 출력되는 전기적 제어신호에 대응되게 생성하는 제어신호를 상기 제1제어밸브 및 제2제어밸브에 이들을 절환시키도록 출력하는 전자비례밸브를 포함하는 것을 특징으로 하는 유압식 건설기계.
- 제1항에 있어서, 상기 제2제어밸브는상기 주행모터와 선회모터를 동시에 조작할 경우, 상기 전자비례밸브로부터 출력되는 제어신호의 크기에 비례하도록 내부 스풀이 절환되어 상기 제2유압펌프로부터 상기 선회모터로 공급되는 작동유 일부를 유압탱크로 드레인시킨 후, 상기 제2유압펌프의 공급유로 최하류측 개구부를 닫는 것을 특징으로 하는 유압식 건설기계.
- 제1항에 있어서, 상기 감지수단으로상기 주행모터에 공급되는 작동유를 제어하는 주행모터용 컨트롤밸브와, 상기 선회모터에 공급되는 작동유를 제어하는 선회모터용 컨트롤밸브의 절환 여부를 검출하여 검출된 조작신호를 상기 콘트롤러에 출력하는 압력센서가 사용되는 것을 특징으로 하는 유압식 건설기계.
- 제1항에 있어서, 상기 제1제어밸브 및 제2제어밸브는 상기 메인 컨트롤밸브 내부에 설치되는 것을 특징으로 하는 유압식 건설기계.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201380072267.5A CN104968866B (zh) | 2013-02-06 | 2013-02-06 | 液压工程机械 |
| US14/765,767 US9725885B2 (en) | 2013-02-06 | 2013-02-06 | Hydraulic construction machinery |
| KR1020157020771A KR20150114954A (ko) | 2013-02-06 | 2013-02-06 | 유압식 건설기계 |
| DE112013006604.1T DE112013006604T5 (de) | 2013-02-06 | 2013-02-06 | Hydraulikbaumaschine |
| PCT/KR2013/000952 WO2014123254A1 (ko) | 2013-02-06 | 2013-02-06 | 유압식 건설기계 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/KR2013/000952 WO2014123254A1 (ko) | 2013-02-06 | 2013-02-06 | 유압식 건설기계 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2014123254A1 true WO2014123254A1 (ko) | 2014-08-14 |
Family
ID=51299843
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2013/000952 Ceased WO2014123254A1 (ko) | 2013-02-06 | 2013-02-06 | 유압식 건설기계 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US9725885B2 (ko) |
| KR (1) | KR20150114954A (ko) |
| CN (1) | CN104968866B (ko) |
| DE (1) | DE112013006604T5 (ko) |
| WO (1) | WO2014123254A1 (ko) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6564754B2 (ja) * | 2016-09-30 | 2019-08-21 | 日立建機株式会社 | 土木・建設機械 |
| JP7227830B2 (ja) * | 2019-03-30 | 2023-02-22 | 住友建機株式会社 | ショベル |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050066041A (ko) * | 2003-12-26 | 2005-06-30 | 두산인프라코어 주식회사 | 굴삭기의 주행복합작업용 유압제어장치 |
| KR20100004049A (ko) * | 2008-07-02 | 2010-01-12 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | 굴삭기용 유압구동 시스템 |
| US20100031648A1 (en) * | 2008-08-08 | 2010-02-11 | Volvo Construction Equipment Holding Sweden Ab | Hydraulic flow sharing system for excavating and pipe laying work |
| US20100043420A1 (en) * | 2008-08-21 | 2010-02-25 | Volvo Construction Equipment Holding Sweden Ab | Hydraulic system for construction equipment |
| KR20100044585A (ko) * | 2008-10-22 | 2010-04-30 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | 선회장치를 구비하는 건설장비용 유압회로 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4380643B2 (ja) | 2006-02-20 | 2009-12-09 | コベルコ建機株式会社 | 作業機械の油圧制御装置 |
| KR100753986B1 (ko) | 2006-04-18 | 2007-08-31 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | 주행직진용 유압회로 |
| KR100753990B1 (ko) | 2006-08-29 | 2007-08-31 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | 주행직진용 유압회로 |
| KR100900436B1 (ko) | 2007-05-21 | 2009-06-01 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | 무한궤도형 중장비의 주행장치 |
| KR101112133B1 (ko) | 2009-06-16 | 2012-02-22 | 볼보 컨스트럭션 이큅먼트 에이비 | 플로트 기능을 갖는 건설장비용 유압시스템 |
-
2013
- 2013-02-06 DE DE112013006604.1T patent/DE112013006604T5/de active Pending
- 2013-02-06 US US14/765,767 patent/US9725885B2/en active Active
- 2013-02-06 KR KR1020157020771A patent/KR20150114954A/ko not_active Ceased
- 2013-02-06 CN CN201380072267.5A patent/CN104968866B/zh active Active
- 2013-02-06 WO PCT/KR2013/000952 patent/WO2014123254A1/ko not_active Ceased
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050066041A (ko) * | 2003-12-26 | 2005-06-30 | 두산인프라코어 주식회사 | 굴삭기의 주행복합작업용 유압제어장치 |
| KR20100004049A (ko) * | 2008-07-02 | 2010-01-12 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | 굴삭기용 유압구동 시스템 |
| US20100031648A1 (en) * | 2008-08-08 | 2010-02-11 | Volvo Construction Equipment Holding Sweden Ab | Hydraulic flow sharing system for excavating and pipe laying work |
| US20100043420A1 (en) * | 2008-08-21 | 2010-02-25 | Volvo Construction Equipment Holding Sweden Ab | Hydraulic system for construction equipment |
| KR20100044585A (ko) * | 2008-10-22 | 2010-04-30 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | 선회장치를 구비하는 건설장비용 유압회로 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104968866B (zh) | 2017-03-08 |
| CN104968866A (zh) | 2015-10-07 |
| US9725885B2 (en) | 2017-08-08 |
| US20150368880A1 (en) | 2015-12-24 |
| DE112013006604T5 (de) | 2016-01-21 |
| KR20150114954A (ko) | 2015-10-13 |
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