WO2012030003A1 - 건설기계용 유압회로 - Google Patents
건설기계용 유압회로 Download PDFInfo
- Publication number
- WO2012030003A1 WO2012030003A1 PCT/KR2010/005968 KR2010005968W WO2012030003A1 WO 2012030003 A1 WO2012030003 A1 WO 2012030003A1 KR 2010005968 W KR2010005968 W KR 2010005968W WO 2012030003 A1 WO2012030003 A1 WO 2012030003A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- hydraulic
- hydraulic pump
- pressure
- pilot
- flow path
- Prior art date
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Classifications
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- 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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
- F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
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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
- E02F9/226—Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
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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
- E02F9/2296—Systems with a variable displacement pump
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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
- E02F9/2221—Control of flow rate; Load sensing arrangements
- E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
- E02F9/2228—Control of flow rate; Load sensing arrangements using pressure-compensating valves including an electronic controller
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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
- E02F9/2282—Systems using center bypass type changeover valves
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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
- E02F9/2285—Pilot-operated systems
-
- 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
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- 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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/021—Valves for interconnecting the fluid chambers of an actuator
-
- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/042—Controlling the temperature of the fluid
-
- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
- F15B21/082—Servomotor systems incorporating electrically operated control means with different modes
Definitions
- the present invention relates to a hydraulic circuit for a construction machine, and in particular, a hydraulic oil for a cooling fan for a cooling fan without separately installing a pilot pump for supplying a signal pressure to a control valve (MCV) for controlling the driving of a hydraulic actuator. And it relates to a hydraulic circuit for construction machinery that can be used as a hydraulic source of the remote control valve (RCV) by refilling the hydraulic oil of the main hydraulic pump.
- MCV control valve
- RCV remote control valve
- a first control valve 5 for controlling hydraulic oil supplied to the hydraulic actuator It is installed in the flow path of the variable displacement first hydraulic pump 2 and drives the boom, bucket, and travel when switching to the pilot signal pressure supply from the fourth hydraulic pump 15.
- a first control valve 5 for controlling hydraulic oil supplied to the hydraulic actuator It is installed in the flow path of the variable displacement first hydraulic pump 2 and drives the boom, bucket, and travel when switching to the pilot signal pressure supply from the fourth hydraulic pump 15.
- variable displacement second hydraulic pump 3 It is installed in the flow path of the variable displacement second hydraulic pump 3 and drives a swing, arm, and travel when switching to supply pilot signal pressure from the fourth hydraulic pump 15.
- Cooling fan connected to the hydraulic motor (9) to reduce the temperature of the operating oil drained to the hydraulic tank (T) through the return flow path 16 by discharging the cooling wind to the oil cooler (oil cooler) ( cooling fan (10),
- An electric relief valve 12 installed in the discharge passage 17 of the third hydraulic pump 4 and controlling the operating pressure for driving the hydraulic motor 9 so as to variably control the rotational speed of the cooling fan 10.
- reference numeral 8 denotes a relief installed in the pilot oil passage 18 of the fourth hydraulic pump 15 and draining hydraulic oil to the hydraulic tank T when a load exceeding the pressure set in the fourth hydraulic pump 15 occurs. Valve.
- the boom or the like is supplied by the hydraulic oil supplied from the first hydraulic pump 2 to the hydraulic actuator.
- Can be driven, and the turning device and the like can be driven by the hydraulic oil supplied from the second hydraulic pump 3 to the hydraulic actuator.
- the hydraulic motor 9 is driven by the hydraulic oil supplied from the third hydraulic pump 4 along the discharge flow path 17, and the cooling fan 10 is rotated by the hydraulic motor 9 to return.
- the temperature of the working oil returned to the hydraulic tank T by passing through the oil cooler 11 installed in the flow path 16 can be reduced.
- the intensity of the cooling wind discharged from the cooling fan 10 to the oil cooler 11 is proportional to the rotational speed of the cooling fan 10, and when the rotational speed of the cooling fan 10 is increased, the load of the hydraulic motor 9 is increased. The pressure is also increased.
- the load pressure of the hydraulic motor 9 is controlled by the electric relief valve (12). That is, when the load pressure of the hydraulic oil supplied from the third hydraulic pump 4 to the hydraulic motor 9 exceeds the set pressure of the electric relief valve 12, the hydraulic tank T passes through the electric relief valve 12. To drain. Therefore, the rotational speed of the cooling fan 10 can be controlled by the set pressure of the electric relief valve 12.
- the hydraulic oil returned to the hydraulic tank T from the hydraulic actuator whose temperature rises when the above-mentioned working device such as a boom is driven is driven by the cooling fan 10 when passing through the oil cooler 11 installed in the return passage 16. Due to the cooling wind discharged, the temperature of the working oil is lowered.
- the controller 14 maintains the set hydraulic oil temperature so that the electric relief valve ( The control signal is transmitted to 12 to change the set pressure.
- the fixed displacement fourth hydraulic pump 15 (referring to the pilot pump) constantly discharges a constant flow rate as the engine 1 rotates.
- the hydraulic oil discharged from the fourth hydraulic pump 15 is instantaneously used as a pilot signal pressure for switching the spools of the first and second control valves 5 and 5a when the pilot pressure generator 6 is switched.
- power loss (set pressure of the relief valve 8) x (discharge flow rate drained to the hydraulic tank T).
- the hydraulic circuit for construction machinery includes a variable displacement first and second hydraulic pumps 2 and 3 and a fixed displacement third hydraulic pump connected to the engine 1. 4) with,
- the hydraulic fluid is installed in the flow path of the variable displacement first hydraulic pump 2 and controls the hydraulic oil supplied to the hydraulic actuator for driving the boom, the bucket, and the traveling device when switching from the third hydraulic pump 4 to the pilot signal pressure supply.
- 1 control valve (5)
- An electric relief valve 12 installed in the discharge passage 17 of the third hydraulic pump 4 and controlling the operating pressure for driving the hydraulic motor 9 so as to variably control the rotational speed of the cooling fan 10.
- a pilot pressure generator 6 which is installed in a pilot flow path 18 branched to a flow path of the third hydraulic pump 4 and supplies pilot signal pressure to the first and second control valves 5 and 5a at the time of switching; ,
- the hydraulic oil from the 3rd hydraulic pump 4 is supplied to the pilot pressure generator 6 by the set pressure of the valve spring 7b, and the valve is supplied to the pilot pressure generator 6.
- a pressure reducing valve 7 which is switched when a load exceeding the set pressure of the spring 7b to drain the hydraulic oil to the hydraulic tank T;
- the pilot flow path 18 is branched to the discharge flow path 17 of the third hydraulic pump 4 for the cooling fan 10 described above, and the pressure reducing valve 7 is provided in the pilot flow path 18. Power loss can be minimized by not using a separate fixed displacement hydraulic pump.
- the rotation speed of the cooling fan 10 is repeated at a high speed or a low speed to generate noise (referring to a mechanical sound generated by the irregular rotation speed of the cooling fan 10). .
- the driver may not operate smoothly with irregular noise due to the change in the rotation speed of the cooling fan 10.
- Embodiments of the present invention relate to a hydraulic circuit for a construction machine, which makes it unnecessary to use a separate pilot pump for supplying a signal pressure to a hydraulic actuator control valve (MCV) to prevent power loss.
- MCV hydraulic actuator control valve
- Embodiment of the present invention by supplementing the hydraulic oil of the hydraulic pump for the cooling fan and the hydraulic oil of the main hydraulic pump as a hydraulic source of the RCV, to prevent the rotation speed of the hydraulic motor for the cooling fan in accordance with the operation of the RCV, cooling fan It is related to the hydraulic circuit for construction machinery to prevent the generation of noise due to the change of rotational speed of the engine.
- a first control valve installed in a flow path of the first hydraulic pump and controlling hydraulic oil supplied to respective hydraulic actuators for driving the work device and the traveling device;
- a second control valve installed in a flow path of the second hydraulic pump and controlling hydraulic oil supplied to respective hydraulic actuators for driving the turning device, the working device and the traveling device at the time of switching;
- a hydraulic motor connected to the third hydraulic pump
- a cooling fan connected to the hydraulic motor and discharging cooling air to the oil cooler installed in the return flow paths of the first and second hydraulic pumps to rotate the hydraulic oil returned to the hydraulic tank;
- a temperature sensor for detecting the hydraulic oil temperature of the hydraulic tank
- An electric relief valve installed in the discharge flow path of the third hydraulic pump and controlling the set pressure of the hydraulic oil supplied to the hydraulic motor to variably control the rotational speed of the cooling fan;
- a first shuttle valve having one input part connected to a flow path of the first hydraulic pump and the other input part connected to a discharge flow path of the third hydraulic pump, and outputting a high pressure hydraulic fluid among the first hydraulic pump and the third hydraulic pump;
- a second shuttle valve having one input part connected to a flow path of the second hydraulic pump and the other input part connected to a discharge flow path of the third hydraulic pump, and outputting a high pressure hydraulic fluid among the second hydraulic pump and the third hydraulic pump;
- pilot pressure generator It is installed in the pilot flow path respectively connected to the output of the first and second shuttle valves, and supplies the hydraulic oil of relatively high pressure among the first, second and third hydraulic pumps to the first and second control valves at the pilot signal pressure.
- pilot pressure generator a pilot pressure generator.
- the hydraulic oil of the relatively high pressure of the first, second, third hydraulic pump by the set pressure of the valve spring is supplied to the pilot pressure generator as a pilot signal pressure
- the pilot pressure generating device further includes a pressure reducing valve that is switched when a load is generated that exceeds the set pressure of the valve spring to drain the hydraulic oil to the hydraulic tank.
- Hydraulic circuit for a construction machine according to an embodiment of the present invention configured as described above has the following advantages.
- the cooling efficiency of the cooling fan is prevented from being lowered due to the decrease in the rotational speed of the hydraulic motor for the cooling fan. Noise caused by rotation speed can prevent driver's interference.
- FIG. 3 is a rotational speed waveform diagram of a cooling fan according to the prior art
- FIG. 4 is a hydraulic circuit diagram for a construction machine according to an embodiment of the present invention.
- the first control valve (MCV) 5 It is installed in the flow path of the first hydraulic pump (2), and controls the hydraulic oil supplied to each of the hydraulic actuator (a, b, c) for driving the boom (bucket), the travel device (travel) at the time of switching
- the first control valve (MCV) 5 It is installed in the flow path of the first hydraulic pump (2), and controls the hydraulic oil supplied to each of the hydraulic actuator (a, b, c) for driving the boom (bucket), the travel device (travel) at the time of switching
- the first control valve (MCV) 5 The first control valve (MCV) 5
- the hydraulic oil is installed in the flow path of the second hydraulic pump 3 and supplied to the respective hydraulic actuators d, e, and f for driving the swing, the arm, and the travel.
- An electric relief installed in the discharge passage 17 of the third hydraulic pump 4 and variably controlling the set pressure of the hydraulic oil supplied to the hydraulic motor 9 so as to variably control the rotational speed of the cooling fan 10.
- One input portion is connected to the flow path of the first hydraulic pump 2, the other input portion is connected to the discharge flow path 17 of the third hydraulic pump 4, the first hydraulic pump 2 and the third hydraulic pump 3 A first shuttle valve 20 for outputting a high pressure hydraulic fluid;
- One input portion is connected to the flow path of the second hydraulic pump 3, the other input portion is connected to the discharge flow path 17 of the third hydraulic pump 4, the second hydraulic pump 3 and the third hydraulic pump 4 A second shuttle valve 21 for outputting a high pressure hydraulic fluid;
- a pilot pressure generator (RCV) 6 for supplying hydraulic oil to the first and second control valves 5 and 5a at a pilot signal pressure.
- the pilot oil generating device is installed in the above-described pilot flow passage 18, and the hydraulic oil having a relatively high pressure among the first, second and third hydraulic pumps 2, 3 and 4 is set by the set pressure of the valve spring 7b.
- the hydraulic oil discharged from the first hydraulic pump 2 is operated by operating the spools of the first and second control valves 5 and 5a, respectively, due to the operation of the pilot pressure generator 6 described above.
- the hydraulic actuators (a; boom cylinder, b; bucket cylinder, c; driving motor) are respectively driven by the hydraulic oil (d; turning motor, e; arm cylinder) by the hydraulic oil discharged from the second hydraulic pump (3). , f; drive motor).
- the hydraulic motor 9 is driven by the hydraulic oil supplied along the discharge passage 17 from the third hydraulic pump 4 described above, and the cooling fan 10 is rotated due to the driving of the hydraulic motor 9.
- cooling air is discharged to the oil cooler 11. Therefore, the temperature of the hydraulic oil returned from the hydraulic actuators to the hydraulic tank T through the oil cooler 11 installed in the return passage 16 can be reduced.
- the hydraulic oil discharged from the variable displacement first and second hydraulic pumps 2 and 3 maintains a pressure relatively higher than the pressure of the hydraulic oil discharged from the fixed displacement third hydraulic pump 4.
- the hydraulic oil discharged from the first and second hydraulic pumps 2 and 3 is output through the outputs of the first and second shuttle valves 20 and 21, respectively, and then the valve spring 7b along the pilot flow path 18.
- the pilot pressure generator 6 is supplied to the pilot pressure generator 6 via the pressure reducing valve 7 at the pressure set by the valve.
- the hydraulic fluid from the 1st, 2nd hydraulic pump 2, 3 is replenished, and the pilot signal to the pilot pressure generator 6 along the pilot flow path 18 is carried out. It can supply as a pressure.
- the hydraulic oil of the first and second hydraulic pumps 2 and 3 is replenished through the pilot oil passage 18 at the moment when the initial high pressure for operating the pilot pressure generator 6 is generated, and then the third hydraulic pump is thereafter.
- the hydraulic oil pressure of (4) becomes high, only the flow volume corresponding to the operation of the pilot pressure generator 6 is required.
- the flow rate loss for driving the hydraulic motor 9 is reduced when the pilot pressure generator 6 is operated, so that the rotation speed of the hydraulic motor 9 is not changed and the cooling fan 10 is constantly rotated, thereby cooling efficiency. The fall can be prevented.
- the noise does not change due to the rotational speed of the cooling fan 10, the driver can work comfortably.
- the hydraulic oil pressure of the third hydraulic pump 4 is higher than the hydraulic oil pressure of the first and second hydraulic pumps 2 and 3, and the first and second hydraulic pumps 2, when the pilot pressure generator 6 is initially operated. Even in the case where high pressure is not generated in 3), the working oil of the third hydraulic pump 4 is not quickly reduced. Therefore, the cooling fan 10 is not caused to change its rotation speed.
- the fixed displacement type for driving the hydraulic motor for the cooling fan as a pilot signal pressure supplied to the pilot pressure generator (RCV) to control the driving of the hydraulic actuator
- the hydraulic oil of the hydraulic pump is used, but the hydraulic oil of the variable displacement main hydraulic pump is replenished.
- the flow rate supplied to the hydraulic motor for the cooling fan is not reduced when the pilot pressure generator is operated, and thus the cooling efficiency is improved, and the rotation speed of the cooling fan is kept constant, thereby preventing the occurrence of noise due to the irregular rotation speed. .
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- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
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- Chemical & Material Sciences (AREA)
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Abstract
Description
Claims (3)
- 엔진에 연결되는 가변용량형 제1,2유압펌프 및 고정용량형 제3유압펌프;상기 제1유압펌프의 유로에 설치되고, 절환시 작업장치,주행장치를 구동시키는 각각의 유압 액츄에이터에 공급되는 작동유를 제어하는 제1제어밸브;상기 제2유압펌프의 유로에 설치되고, 절환시 선회장치, 작업장치 및 주행장치를 구동시키는 각각의 유압 액츄에이터에 공급되는 작동유를 제어하는 제2제어밸브;상기 제3유압펌프에 연결되는 유압모터;상기 유압모터에 연결되고, 회전시 상기 제1,2유압펌프의 리턴유로에 설치되는 오일쿨러에 냉각풍을 토출시켜 유압탱크로 귀환되는 작동유를 냉각시키는 냉각팬;상기 유압탱크의 작동유 온도를 검출하는 온도센서;상기 제3유압펌프의 토출유로에 설치되고, 상기 냉각팬의 회전속도를 가변적으로 제어할 수 있도록 상기 유압모터에 공급되는 작동유의 설정압력을 제어하는 전기식 릴리프밸브;상기 온도센서로부터의 검출신호에 따라 상기 전기식 릴리프밸브의 설정압력을 가변시켜 유압모터를 구동시키는 작동압을 제어하는 제어기;일측 입력부가 상기 제1유압펌프의 유로에 연결되고 타측 입력부가 상기 제3유압펌프의 토출유로에 연결되며, 상기 제1유압펌프와 제3유압펌프중 높은 압력의 작동유를 출력하는 제1셔틀밸브;일측 입력부가 상기 제2유압펌프의 유로에 연결되고 타측 입력부가 상기 제3유압펌프의 토출유로에 연결되며, 상기 제2유압펌프와 제3유압펌프중 높은 압력의 작동유를 출력하는 제2셔틀밸브; 및상기 제1,2셔틀밸브의 출력부에 각각 연결되는 파일럿 유로에 설치되고, 절환시 상기 제1,2,3유압펌프중 상대적으로 높은 압력의 작동유를 상기 제1,2제어밸브에 파일럿 신호압으로 공급하는 파일럿 압력 발생장치를 포함하는 것을 특징으로 하는 건설기계용 유압회로.
- 청구항 1에 있어서, 상기 파일럿 유로에 설치되고, 밸브스프링의 설정된 압력에 의해 제1,2,3유압펌프중 상대적으로 높은 압력의 작동유를 파일럿 압력 발생장치에 파일럿 신호압으로 공급하고, 파일럿 압력 발생장치에 밸브스프링의 설정된 압력을 초과하는 부하 발생시 절환되어 작동유를 유압탱크로 드레인시키는 감압밸브를 더 포함하는 것을 특징으로 하는 건설기계용 유압회로.
- 청구항 2에 있어서, 상기 감압밸브와 파일럿 압력 발생장치사이의 상기 파일럿 유로에 설치되는 릴리프밸브를 더 포함하는 것을 특징으로 하는 건설기계용 유압회로.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2013526979A JP5600807B2 (ja) | 2010-09-02 | 2010-09-02 | 建設機械用油圧回路 |
EP10856749.6A EP2613060A4 (en) | 2010-09-02 | 2010-09-02 | HYDRAULIC CIRCUIT FOR CONSTRUCTION EQUIPMENT |
KR1020137004527A KR20130108264A (ko) | 2010-09-02 | 2010-09-02 | 건설기계용 유압회로 |
PCT/KR2010/005968 WO2012030003A1 (ko) | 2010-09-02 | 2010-09-02 | 건설기계용 유압회로 |
CN201080068892.9A CN103080566B (zh) | 2010-09-02 | 2010-09-02 | 用于施工设备的液压回路 |
US13/819,761 US9228599B2 (en) | 2010-09-02 | 2010-09-02 | Hydraulic circuit for construction equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/KR2010/005968 WO2012030003A1 (ko) | 2010-09-02 | 2010-09-02 | 건설기계용 유압회로 |
Publications (1)
Publication Number | Publication Date |
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WO2012030003A1 true WO2012030003A1 (ko) | 2012-03-08 |
Family
ID=45773063
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/KR2010/005968 WO2012030003A1 (ko) | 2010-09-02 | 2010-09-02 | 건설기계용 유압회로 |
Country Status (6)
Country | Link |
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US (1) | US9228599B2 (ko) |
EP (1) | EP2613060A4 (ko) |
JP (1) | JP5600807B2 (ko) |
KR (1) | KR20130108264A (ko) |
CN (1) | CN103080566B (ko) |
WO (1) | WO2012030003A1 (ko) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2014123253A1 (en) * | 2013-02-06 | 2014-08-14 | Volvo Construction Equipment Ab | Swing control system for construction machines |
KR20160019895A (ko) * | 2013-06-26 | 2016-02-22 | 볼보 컨스트럭션 이큅먼트 에이비 | 건설기계의 제어밸브 제어장치 및 제어방법, 유압펌프 토출유량 제어방법 |
JP6009480B2 (ja) * | 2014-03-06 | 2016-10-19 | 日立建機株式会社 | 建設機械の冷却ファン制御装置 |
KR102183217B1 (ko) * | 2014-03-24 | 2020-11-25 | 두산인프라코어 주식회사 | 유압 활용 엔진 시스템 |
US20170276151A1 (en) * | 2014-09-19 | 2017-09-28 | Volvo Construction Equipment Ab | Hydraulic circuit for construction equipment |
GB2529909B (en) | 2014-09-30 | 2016-11-23 | Artemis Intelligent Power Ltd | Industrial system with synthetically commutated variable displacement fluid working machine |
WO2016093393A1 (ko) * | 2014-12-10 | 2016-06-16 | 볼보 컨스트럭션 이큅먼트 에이비 | 건설기계의 유압 회로 |
US20180023270A1 (en) * | 2015-01-08 | 2018-01-25 | Volvo Construction Equipment Ab | Method for controlling flow rate of hydraulic pump of construction machine |
CN105673599B (zh) * | 2016-03-15 | 2017-02-08 | 陕西理工学院 | 用于控制被焊件轴向长度的摩擦焊机液压***及控制方法 |
JP6690858B2 (ja) * | 2016-12-14 | 2020-04-28 | 株式会社クボタ | 作業機の油圧システム |
CN107477051B (zh) * | 2017-09-15 | 2019-02-15 | 太原理工大学 | 载荷差异油电液复合背压调控双执行器*** |
CN108757650A (zh) * | 2018-06-29 | 2018-11-06 | 日照职业技术学院 | 一种施工机械的液压驱动装置及控制方法 |
CN108953738B (zh) * | 2018-07-12 | 2019-10-29 | 温州大学激光与光电智能制造研究院 | 双阀体装置***的控制方法 |
CN112377473A (zh) * | 2020-11-19 | 2021-02-19 | 济宁职业技术学院 | 机电液压动力***及机电一体化驱动装置 |
CN112648251B (zh) * | 2020-12-22 | 2023-04-28 | 天水锻压机床(集团)有限公司 | 大型折弯机用蓄能器自动补液液压阀 |
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JPH11132154A (ja) * | 1997-10-29 | 1999-05-18 | Komatsu Ltd | 作業車両用作業機ポンプの容量制御装置 |
JPH11218104A (ja) * | 1998-01-30 | 1999-08-10 | Kayaba Ind Co Ltd | 油圧駆動装置 |
JP2002188177A (ja) * | 2000-12-18 | 2002-07-05 | Hitachi Constr Mach Co Ltd | 建設機械の制御装置 |
KR100640538B1 (ko) * | 2002-12-28 | 2006-10-30 | 현대중공업 주식회사 | 굴삭기 유압펌프 유량제어장치 |
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JPH0942204A (ja) * | 1995-07-24 | 1997-02-10 | Kobe Steel Ltd | クローラ式車両のポンプ制御装置 |
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JP4667083B2 (ja) * | 2005-03-09 | 2011-04-06 | 株式会社加藤製作所 | 油圧制御装置 |
JP4287425B2 (ja) | 2005-11-25 | 2009-07-01 | 日立建機株式会社 | 油圧作業機械のポンプトルク制御装置 |
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JP2010025179A (ja) * | 2008-07-16 | 2010-02-04 | Hitachi Constr Mach Co Ltd | 走行作業機械の油圧駆動システム |
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2010
- 2010-09-02 EP EP10856749.6A patent/EP2613060A4/en not_active Withdrawn
- 2010-09-02 KR KR1020137004527A patent/KR20130108264A/ko active IP Right Grant
- 2010-09-02 US US13/819,761 patent/US9228599B2/en not_active Expired - Fee Related
- 2010-09-02 CN CN201080068892.9A patent/CN103080566B/zh not_active Expired - Fee Related
- 2010-09-02 WO PCT/KR2010/005968 patent/WO2012030003A1/ko active Application Filing
- 2010-09-02 JP JP2013526979A patent/JP5600807B2/ja not_active Expired - Fee Related
Patent Citations (6)
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JPH11132154A (ja) * | 1997-10-29 | 1999-05-18 | Komatsu Ltd | 作業車両用作業機ポンプの容量制御装置 |
JPH11218104A (ja) * | 1998-01-30 | 1999-08-10 | Kayaba Ind Co Ltd | 油圧駆動装置 |
JP2002188177A (ja) * | 2000-12-18 | 2002-07-05 | Hitachi Constr Mach Co Ltd | 建設機械の制御装置 |
KR100640538B1 (ko) * | 2002-12-28 | 2006-10-30 | 현대중공업 주식회사 | 굴삭기 유압펌프 유량제어장치 |
JP2008031752A (ja) * | 2006-07-31 | 2008-02-14 | Shin Caterpillar Mitsubishi Ltd | 作業機械における冷却ファン |
KR20090068823A (ko) * | 2007-12-24 | 2009-06-29 | 두산인프라코어 주식회사 | 건설 기계의 유압펌프 유량제어장치 |
Non-Patent Citations (1)
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See also references of EP2613060A4 * |
Also Published As
Publication number | Publication date |
---|---|
US20140083092A1 (en) | 2014-03-27 |
JP2013536927A (ja) | 2013-09-26 |
KR20130108264A (ko) | 2013-10-02 |
EP2613060A4 (en) | 2014-12-03 |
EP2613060A1 (en) | 2013-07-10 |
US9228599B2 (en) | 2016-01-05 |
CN103080566A (zh) | 2013-05-01 |
CN103080566B (zh) | 2016-02-10 |
JP5600807B2 (ja) | 2014-10-01 |
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