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KR20080099505A - Pressure Compensation Hydraulic Circuit of Heavy Equipment - Google Patents

Pressure Compensation Hydraulic Circuit of Heavy Equipment Download PDF

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Publication number
KR20080099505A
KR20080099505A KR1020070045131A KR20070045131A KR20080099505A KR 20080099505 A KR20080099505 A KR 20080099505A KR 1020070045131 A KR1020070045131 A KR 1020070045131A KR 20070045131 A KR20070045131 A KR 20070045131A KR 20080099505 A KR20080099505 A KR 20080099505A
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South Korea
Prior art keywords
switching valve
hydraulic
arm cylinder
hydraulic pump
valve
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KR1020070045131A
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Korean (ko)
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방상호
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볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비
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Priority to KR1020070045131A priority Critical patent/KR20080099505A/en
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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
    • 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
    • E02F9/2292—Systems with two or more pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/40—Special vehicles
    • B60Y2200/41—Construction vehicles, e.g. graders, excavators
    • B60Y2200/412—Excavators
    • 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
    • F15B13/026—Pressure compensating valves

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

개시된 내용은, 굴삭기의 주행장치와 작업장치를 동시에 구동시켜 복합작업을 수행하는 경우(붐 상승(boom up)과 아암 인(arm in) 구동으로 평탄작업을 수행하는 경우), 작업조건에 따라 유압펌프로부터의 작동유를 작업장치에 적절하게 분배공급하여 원활한 복합작업이 이루어지도록한 것으로,The disclosure discloses that when a traveling device and a work device of an excavator are simultaneously driven to perform a compound work (flattening by boom up and arm in driving), Proper distribution and supply of the working oil from the pump to the working device to achieve a smooth composite work,

본 발명의 실시예에 의한 중장비의 압력보상 유압회로는, 가변용량형 제1,2유압펌프와,Pressure compensation hydraulic circuit of the heavy equipment according to an embodiment of the present invention, the variable displacement first and second hydraulic pumps,

제1유압펌프의 제1센터바이패스통로에 설치되는 좌주행용 절환밸브 및 아암실린더용 절환밸브와,A switching valve for left travel and an arm cylinder installed in the first center bypass passage of the first hydraulic pump,

제2유압펌프의 제2센터바이패스통로에 설치되는 우주행용 절환밸브 및 붐실린더용 절환밸브와,A space travel switching valve and a boom cylinder switching valve installed in a second center bypass passage of the second hydraulic pump;

제2센터바이패스통로의 상류측에 설치되고, 주행장치와 작업장치를 구동시키는 작업모드시 외부로부터 신호압 공급으로 절환되며, 절환시 제1유압펌프로부터의 작동유를 좌주행용 및 우주행용 절환밸브에 각각 공급하고, 제2유압펌프로부터의 작동유를 아암실린더용 절환밸브 및 붐실린더용 절환밸브에 각각 공급하는 주행직진밸브와,Installed on the upstream side of the second center bypass passage, it switches to supply of signal pressure from the outside in the work mode for driving the traveling device and the work device, and switches the hydraulic oil from the first hydraulic pump for left driving and space travel A traveling straight valve for supplying the valve to the valve, and supplying the hydraulic oil from the second hydraulic pump to the arm cylinder switching valve and the boom cylinder switching valve, respectively;

제2유압펌프로부터 아암실린더용 절환밸브에 작동유를 공급하는 병렬유로와, 아암실린더용 절환밸브의 입구측 포트를 연결하는 압력보상유로에 설치되고, 붐상승 신호압력과 아암실린더용 절환밸브의 입구측 포트에 형성되는 압력차에 의해 절 환되며, 스풀의 절환량에 따라 제2유압펌프로부터의 작동유를 아암실린더용 절환밸브와 붐실린더용 절환밸브에 분배공급하는 가변 오리피스를 포함한다.It is installed in the parallel flow path for supplying the hydraulic oil from the second hydraulic pump to the switch valve for the arm cylinder, and the pressure compensation flow path connecting the inlet port of the arm cylinder switch valve, and the inlet of the boom up signal pressure and the switch valve for the arm cylinder. It is switched by the pressure difference formed in the side port, and includes the variable orifice which distributes and supplies the hydraulic oil from a 2nd hydraulic pump to an arm cylinder switching valve and a boom cylinder switching valve according to the switching amount of a spool.

Description

중장비의 압력보상 유압회로{hydraulic circuit of pressure compensation of heavy equipment}Hydraulic circuit of pressure compensation of heavy equipment

도 1은 종래 기술에 의한 중장비의 유압회로도,1 is a hydraulic circuit diagram of a heavy equipment according to the prior art,

도 2는 본 발명의 실시예에 의한 중장비의 압력보상 유압회로도이다.2 is a pressure compensation hydraulic circuit diagram of heavy equipment according to an embodiment of the present invention.

*도면중 주요 부분에 사용된 부호의 설명* Explanation of symbols used in the main part of the drawing

1; 제1유압펌프One; 1st hydraulic pump

2; 제2유압펌프;2; A second hydraulic pump;

3; 제1센터바이패스통로3; Center 1 bypass passage

4; 좌주행 절환밸브4; Left running switching valve

5,6,7,8; 작업장치용 절환밸브5,6,7,8; Switching Valve for Work Equipment

9; 제2센터바이패스통로9; 2nd Center Bypass Path

10; 우주행 절환밸브10; Space Flight Valve

11,12,13; 작업장치용 절환밸브11,12,13; Switching Valve for Work Equipment

14; 주행직진밸브14; Travel straight valve

15,16; 병렬유로15,16; Parallel Euro

17; 압력보상유로17; Pressure compensation flow path

18; 가변 오리피스18; Adjustable orifice

본 발명은 굴삭기의 주행장치와 작업장치를 동시에 구동시켜 복합작업을 수행하는 경우 작업장치에 발생되는 압력 차이를 상쇄시킬 수 있도록한 중장비의 압력보상 유압회로에 관한 것이다.The present invention relates to a pressure compensation hydraulic circuit of heavy equipment that can offset the pressure difference generated in the working device when performing the complex operation by driving the traveling device and the working device of the excavator at the same time.

더욱 상세하게는, 주행장치와 작업장치를 동시에 구동시켜 복합작업을 수행하는 경우(붐 상승(boom up)과 아암 인(arm in) 구동으로 평탄작업을 수행하는 경우), 작업조건에 따라 유압펌프로부터의 작동유를 작업장치에 적절하게 분배공급하여 원활한 복합작업이 이루어지도록한 중장비의 압력보상 유압회로에 관한 것이다.More specifically, when the traveling device and the work device are simultaneously driven to perform a compound work (flat operation by boom up and arm in driving), the hydraulic pump according to the working conditions A pressure compensating hydraulic circuit of heavy equipment for properly distributing and supplying hydraulic oil from a working device to a smooth work.

도 1에 도시된 바와 같이, 종래 기술에 의한 중장비의 유압회로는, 가변용량형 제1,2유압펌프(1,2)와,As shown in Figure 1, the hydraulic circuit of the heavy equipment according to the prior art, the variable displacement first and second hydraulic pumps (1, 2),

제1유압펌프(1)의 제1센터바이패스통로(3)에 설치되는 좌주행용 절환밸브(4) 및 작업장치용 절환밸브(5,6,7,8)(스윙, 붐, 옵션장치, 아암)와,Left running switching valve 4 and work device switching valve 5, 6, 7, 8 installed in the first center bypass passage 3 of the first hydraulic pump 1 (swing, boom, option device) Arm),

제2유압펌프(2)의 제2센터바이패스통로(9)에 설치되는 우주행용 절환밸브(10) 및 작업장치용 절환밸브(11,12,13)(붐, 버킷, 선회모터)와,A space travel switching valve 10 and a work device switching valve 11, 12, 13 (boom, bucket, swing motor) installed in the second center bypass passage 9 of the second hydraulic pump 2,

제2센터바이패스통로(9)의 상류측에 설치되고, 복합작업을 수행하기 위하여 외부로부터 신호압 공급으로 절환시 제1유압펌프(1)로부터의 작동유를 좌주행용 및 우주행용 절환밸브(4,10)에 각각 공급하고, 제2유압펌프(2)로부터의 작동유를 작업장치용 절환밸브(5,6,7,8)(11,12,13)에 공급하는 주행직진밸브(14)를 포함한다.It is installed on the upstream side of the second center bypass passage (9), and switching the operating oil from the first hydraulic pump (1) for left travel and space travel when switching to the signal pressure supply from the outside in order to perform the combined work ( 4 and 10, respectively, and the traveling straight valve 14 for supplying the hydraulic oil from the second hydraulic pump 2 to the switching valves 5, 6, 7, 8, 11, 12, and 13 for the work device. It includes.

도면중 미 설명부호 s는 장비의 스윙장치와 아암실린더를 동시에 구동시 스윙장치 구동용 신호압을 공급받아 절환되며 제1유압펌프(1)로부터 병렬유로(16)를 경유하여 아암실린더에 설정량 이상의 작동유 공급되는 것을 제한하는 스풀이다.In the drawing, reference numeral s denotes a switch device supplied with a swing device driving signal pressure when driving a swing device and an arm cylinder of the equipment at the same time, and is set in the arm cylinder via the parallel flow path 16 from the first hydraulic pump 1. It is the spool which restricts supply of the above hydraulic fluid.

종래 기술의 유압회로에서는, 평탄작업에서와 같이 주행장치와 작업장치(붐,아암)를 동시에 구동시켜 복합작업을 수행하는 경우, 외부로부터 파일럿 신호압의 공급으로 주행직진밸브(14)가 도면상, 우측방향으로 절환된다.In the hydraulic circuit of the prior art, when the traveling device and the work device (boom, arm) are simultaneously driven as in the flat work to carry out the combined work, the traveling straight valve 14 is supplied with the pilot signal pressure from the outside. , Is switched to the right direction.

이로 인해 제1유압펌프(1)로부터 토출되는 작동유는 좌주행용 절환밸브(4) 및 절환된 주행직진밸브(14)를 경유하여 우주행용 절환밸브(10)에 공급된다. 제2유압펌프(2)로부터 토출되는 작동유는 주행직진밸브(14)를 경유하여 병렬유로(15,16)를 경유하여 작업장치용 절환밸브(8,11)에 각각 공급된다.Accordingly, the hydraulic oil discharged from the first hydraulic pump 1 is supplied to the space travel switching valve 10 via the left traveling switching valve 4 and the switched traveling straight valve 14. The hydraulic oil discharged from the second hydraulic pump 2 is supplied to the switching device 8, 11 for the working device via the parallel flow paths 15, 16 via the traveling straight valve 14, respectively.

즉 제1유압펌프(1)로부터의 작동유는 좌주행용 및 우주행용 절환밸브(4,10)를 경유하여 좌측 및 우측 주행장치에 각각 공급되고, 제2유압펌프(2)로부터의 작동유는 작업장치용 절환밸브(8,11)를 경유하여 아암실린더 및 붐실린더에 각각 공급되므로, 장비의 주행장치와 작업장치를 동시에 구동시켜 복합작업을 수행할 수 있다.That is, the hydraulic oil from the first hydraulic pump 1 is supplied to the left and right traveling devices, respectively, via the left and space travel switching valves 4 and 10, and the hydraulic oil from the second hydraulic pump 2 is operated. Since it is respectively supplied to the arm cylinder and the boom cylinder via the switching valves 8 and 11 for a device, it is possible to drive a traveling device and a work device of a machine simultaneously, and to perform a compound operation.

이때 작업조건에 따라 작업장치(아암실린더)용 절환밸브(8)의 입구측의 압력 과, 작업장치(붐실린더)용 절환밸브(11)의 입구측의 압력의 차이가 발생된다. 예를들어 붐 상승과 아암 인 구동으로 평탄작업시 아암실린더에 발생되는 부하압력보다 붐실린더에 발생되는 부하압력이 상대적으로 크게 된다.At this time, a difference between the pressure at the inlet side of the work valve (arm cylinder) changeover valve 8 and the pressure at the inlet side of the work machine (boom cylinder) changeover valve 11 occurs. For example, the boom lift and arm in drive cause the load pressure generated on the boom cylinder to be relatively greater than the load pressure generated on the arm cylinder during flattening.

이로 인해 제2유압펌프(2)로부터 토출되는 작동유는 붐실린더보다 아암실린더쪽으로 상대적으로 많이 공급되므로(붐 상승 구동속도보다 아암 인 구동속도가 상대적으로 증가되어 평탄작업시 버킷이 지면을 파고 들어감) 원활한 복합작업이 이루어지지 못하는 문제점을 갖는다.As a result, the hydraulic oil discharged from the second hydraulic pump 2 is supplied to the arm cylinder relatively more than the boom cylinder (the arm driving speed is relatively increased than the boom raising driving speed, so that the bucket enters the ground during flat work). There is a problem that a smooth composite operation is not made.

본 발명의 실시예는, 굴삭기의 주행장치와 작업장치를 동시에 구동시켜 복합작업을 수행하는 경우, 작업조건에 따라 유압펌프로부터의 작동유를 작업장치에 적절하게 분배공급하여 원활한 복합작업으로 인해 작업성을 향상시킬수 있도록한 중장비의 압력보상 유압회로와 관련된다.In the embodiment of the present invention, when the traveling device and the work device of the excavator is carried out at the same time to perform a compound work, the workability due to the smooth operation by smoothly distributing and supplying the hydraulic oil from the hydraulic pump to the work device according to the working conditions It is related to the pressure compensating hydraulic circuit of heavy equipment to improve the pressure.

본 발명의 실시예에 의한 중장비의 압력보상 유압회로는, 가변용량형 제1,2유압펌프와,Pressure compensation hydraulic circuit of the heavy equipment according to an embodiment of the present invention, the variable displacement first and second hydraulic pumps,

제1유압펌프의 제1센터바이패스통로에 설치되는 좌주행용 절환밸브 및 아암실린더용 절환밸브와,A switching valve for left travel and an arm cylinder installed in the first center bypass passage of the first hydraulic pump,

제2유압펌프의 제2센터바이패스통로에 설치되는 우주행용 절환밸브 및 붐실 린더용 절환밸브와,A space travel switching valve and a boom cylinder switching valve installed in the second center bypass passage of the second hydraulic pump;

제2센터바이패스통로의 상류측에 설치되고, 주행장치와 작업장치를 구동시키는 작업모드시 외부로부터 신호압 공급으로 절환되며, 절환시 제1유압펌프로부터의 작동유를 좌주행용 및 우주행용 절환밸브에 각각 공급하고, 제2유압펌프로부터의 작동유를 아암실린더용 절환밸브 및 붐실린더용 절환밸브에 각각 공급하는 주행직진밸브와,Installed on the upstream side of the second center bypass passage, it switches to supply of signal pressure from the outside in the work mode for driving the traveling device and the work device, and switches the hydraulic oil from the first hydraulic pump for left driving and space travel A traveling straight valve for supplying the valve to the valve, and supplying the hydraulic oil from the second hydraulic pump to the arm cylinder switching valve and the boom cylinder switching valve, respectively;

제2유압펌프로부터 아암실린더용 절환밸브에 작동유를 공급하는 병렬유로와, 아암실린더용 절환밸브의 입구측 포트를 연결하는 압력보상유로에 설치되고, 붐상승 신호압력과 아암실린더용 절환밸브의 입구측 포트에 형성되는 압력차에 의해 절환되며, 스풀의 절환량에 따라 제2유압펌프로부터의 작동유를 아암실린더용 절환밸브와 붐실린더용 절환밸브에 분배공급하는 가변 오리피스를 포함한다.It is installed in the parallel flow path for supplying the hydraulic oil from the second hydraulic pump to the switch valve for the arm cylinder, and the pressure compensation flow path connecting the inlet port of the arm cylinder switch valve, and the inlet of the boom up signal pressure and the switch valve for the arm cylinder. It is switched by the pressure difference formed in the side port, and includes the variable orifice which distributes and supplies the hydraulic oil from a 2nd hydraulic pump to an arm cylinder switching valve and a boom cylinder switching valve according to the switching amount of a spool.

전술한 가변 오리피스는 붐상승 신호압력의 입력으로 절환시 아암실린더용 절환밸브에 설정량을 초과하여 작동유 공급되는 것을 제한하는 오리피스를 더 포함한다.The above-described variable orifice further includes an orifice for restricting the supply of the hydraulic oil in excess of the set amount to the switching valve for the arm cylinder when switching to the input of the boom up signal pressure.

이하, 본 발명의 실시예를 첨부된 도면을 참조하여 설명하되, 이는 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 발명을 용이하게 실시할 수 있을 정도로 상세하게 설명하기 위한 것이지, 이로 인해 본 발명의 기술적인 사상 및 범주가 한정되는 것을 의미하지는 않는 것이다.DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings, which is intended to explain in detail enough to enable those skilled in the art to easily practice the present invention. It is not intended that the technical spirit and scope of the invention be limited.

도 2에 도시된 바와 같이, 본 발명의 실시예에 의한 중장비의 압력보상 유압회로는, 가변용량형 제1,2유압펌프(1,2)와,As shown in Figure 2, the pressure compensation hydraulic circuit of the heavy equipment according to an embodiment of the present invention, the variable displacement first and second hydraulic pumps (1, 2),

제1유압펌프(1)의 제1센터바이패스통로(3)에 설치되는 좌주행용 절환밸브(4) 및 아암실린더용 절환밸브(8)와,A left running switching valve 4 and an arm cylinder switching valve 8 installed in the first center bypass passage 3 of the first hydraulic pump 1;

제2유압펌프(2)의 제2센터바이패스통로(9)에 설치되는 우주행용 절환밸브(10) 및 붐실린더용 절환밸브(11)와,A space travel switching valve 10 and a boom cylinder switching valve 11 installed in the second center bypass passage 9 of the second hydraulic pump 2;

제2센터바이패스통로(9)의 상류측에 설치되고, 주행장치와 작업장치를 구동시키는 작업모드시 외부로부터 신호압 공급으로 절환되며, 절환시 제1유압펌프(1)로부터의 작동유를 좌주행용 및 우주행용 절환밸브에 각각 공급하고, 제2유압펌프(2)로부터의 작동유를 아암실린더용 절환밸브(8) 및 붐실린더용 절환밸브(11)에 각각 공급하는 주행직진밸브(14)와,It is installed on the upstream side of the second center bypass passage 9, and is switched to supply of signal pressure from the outside in the working mode for driving the traveling device and the work device, and during operation, the hydraulic oil from the first hydraulic pump 1 is left. A traveling straight valve 14 for supplying a traveling valve for traveling and space travel, respectively, and supplying the hydraulic oil from the second hydraulic pump 2 to an arm cylinder switching valve 8 and a boom cylinder switching valve 11, respectively. Wow,

제2유압펌프(2)로부터의 작동유를 아암실린더용 절환밸브(8)에 공급하는 병렬유로(16)와, 아암실린더용 절환밸브(8)의 입구측 포트를 연결하는 압력보상유로(17)에 설치되고, 외부로부터의 붐상승 신호압력과 아암 인 구동에 따라 아암실린더용 절환밸브(8)의 입구측 포트에 형성되는 압력차에 의해 절환되며, 스풀의 절환량에 따라 제2유압펌프(2)로부터의 작동유를 아암실린더용 절환밸브(8)와 붐실린더용 절환밸브(11)에 분배공급하는 가변 오리피스(18)를 포함한다.Pressure compensation flow passage (17) connecting the parallel flow passage (16) for supplying the hydraulic oil from the second hydraulic pump (2) to the switching valve (8) for the arm cylinder, and the inlet side port of the switching valve (8) for the arm cylinder. Is mounted on the inlet port of the arm cylinder switching valve 8 in response to the boom up signal pressure from the outside and the arm in driving, and the second hydraulic pump ( And a variable orifice 18 for distributing and supplying the hydraulic oil from 2) to the arm cylinder switching valve 8 and the boom cylinder switching valve 11.

전술한 가변 오리피스(18)는 붐상승 신호압력의 입력으로 절환시 아암실린더용 절환밸브(8)에 설정량을 초과하여 작동유 공급되는 것을 제한하는 오리피스(19)를 더 포함한다.The above-described variable orifice 18 further includes an orifice 19 for restricting the supply of hydraulic oil to the arm cylinder switching valve 8 in excess of the set amount when switching to the input of the boom up signal pressure.

이때, 주행중 붐실린더와 아암실린더를 동시에 구동시켜 복합작업을 하는 경우, 제2유압펌프(2)로부터의 작동유를 작업조건에 따라 아암실린더용 절환밸브(8)와 붐실린더용 절환밸브(11)에 분배공급하도록 압력보상유로(17)에 설치되는 가변 오리피스(18)를 제외한 구성은, 도 1에 도시된 종래 기술내용과 실질적으로 동일하게 적용되므로 이들의 상세한 설명은 생략하고, 중복되는 도면부호는 동일하게 표기한다.At this time, when the boom cylinder and the arm cylinder are driven at the same time while driving to perform a complex operation, the hydraulic fluid from the second hydraulic pump 2 is switched between the arm cylinder switching valve 8 and the boom cylinder switching valve 11 according to the working conditions. Except for the variable orifice 18 installed in the pressure compensation passage 17 so as to distribute the supply to the supply, the configuration is substantially the same as the prior art shown in FIG. Is written the same.

이하에서, 본 발명의 실시예에 의한 중장비의 압력보상 유압회로의 사용예를 첨부도면을 참조하여 상세하게 설명한다.Hereinafter, a use example of the pressure compensation hydraulic circuit of heavy equipment according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

도 2에 도시된 바와 같이, 평탄작업에서와 같이 주행장치와 작업장치를 동시에 구동시켜 복합작업을 수행하는 경우, 외부로부터 파일럿 신호압의 공급으로 주행직진밸브(14)가 도면상, 우측방향으로 절환된다.As shown in FIG. 2, when performing the combined operation by simultaneously driving the traveling device and the working device as in the flat work, the traveling straight valve 14 is moved in the right direction on the drawing by supplying the pilot signal pressure from the outside. It is switched.

이로 인해 제1유압펌프(1)로부터의 작동유는 좌주행용 절환밸브(4) 및 절환된 주행직진밸브(14)를 경유하여 우주행용 절환밸브(10)에 공급된다. 제2유압펌프(2)로부터의 작동유는 주행직진밸브(14)를 경유하여 병렬유로(15,16)를 경유하여 아암실리더용 절환밸브(8) 및 붐실린더용 절환밸브(11)에 각각 공급된다.Thus, the hydraulic oil from the first hydraulic pump 1 is supplied to the space travel switching valve 10 via the left traveling switching valve 4 and the switched traveling straight valve 14. The hydraulic oil from the second hydraulic pump 2 is transferred to the arm cylinder switching valve 8 and the boom cylinder switching valve 11 via the parallel flow paths 15 and 16 via the traveling straight valve 14, respectively. Supplied.

즉 제1유압펌프(1)로부터의 작동유는 좌주행용 및 우주행용 절환밸브(4,10)를 경유하여 좌측 및 우측 주행장치에 각각 공급되고, 제2유압펌프(2)로부터의 작동유는 아암실리더용 절환밸브(8) 및 붐실린더용 절환밸브(11)를 경유하여 아암실 린더 및 붐실린더에 각각 공급되므로, 장비의 주행장치와 작업장치를 동시에 구동시켜 복합작업을 수행할 수 있다.That is, the hydraulic oil from the first hydraulic pump 1 is supplied to the left and right traveling devices via the left and space travel switching valves 4 and 10, respectively, and the hydraulic oil from the second hydraulic pump 2 is not supplied. Since it is respectively supplied to the arm cylinder and the boom cylinder via the switching valve 8 for the dark cylinder and the switching valve 11 for the boom cylinder, it is possible to carry out a complex operation by simultaneously driving the traveling device and the working device of the equipment.

이때 작업조건에 따라 아암실린더용 절환밸브(8)의 입구측 포트의 압력과, 붐실린더용 절환밸브(11)의 입구측 포트의 압력차이가 발생된다. 예를들어 붐 상승과 아암 인 구동으로 평탄작업시 아암실린더에 발생되는 부하압력보다 붐실린더에 발생되는 부하압력이 상대적으로 크게 된다.At this time, the pressure difference between the inlet port of the arm cylinder switching valve 8 and the inlet port of the boom cylinder switching valve 11 is generated according to the working conditions. For example, the boom lift and arm in drive cause the load pressure generated on the boom cylinder to be relatively greater than the load pressure generated on the arm cylinder during flattening.

이때 붐상승용 파일럿 신호압에 의해 가변 오리피스(18)가 도면상, 하방향으로 절환됨에 따라, 아암실린더보다 붐실린더에 상대적으로 큰 부하압력이 발생되는 경우에도 제2유압펌프(2)로부터 병렬유로(16)를 경유하여 아암실린더용 절환밸브(8)에 공급되는 작동유 량이 오리피스(19)에 의해 제한을 받는다. 이로 인해 아암실린더에 설정량을 초과하여 작동유 공급되는 것이 방지된다.At this time, as the variable orifice 18 is switched downward in the drawing by the pilot signal pressure for raising the boom, even when a larger load pressure is generated in the boom cylinder than the arm cylinder, parallel from the second hydraulic pump 2 The amount of operating fluid supplied to the arm cylinder switching valve 8 via the flow path 16 is limited by the orifice 19. This prevents the hydraulic oil from being supplied to the arm cylinder in excess of the set amount.

한편, 아암 인 구동(붐 상승구동이 정지된 상태)에서와 같이, 붐실린더보다 아암실린더에 발생되는 부하압력이 상대적으로 큰 경우, 아암실린더용 절환밸브(8)의 입구측 포트에 형성되는 압력으로 인해 가변 오리피스(18)가 도면상, 상방향으로 절환된다(도 2에 도시된 상태). 따라서 아암실린더에 설정된 량의 작동유를 공급하여 아암 인 구동을 원활하게 수행할 수 있다.On the other hand, when the load pressure generated in the arm cylinder is relatively larger than that of the boom cylinder, such as in arm in driving (a state in which the boom up / down driving is stopped), the pressure formed at the inlet port of the arm cylinder switching valve 8 This causes the variable orifice 18 to switch upwards in the drawing (state shown in FIG. 2). Therefore, it is possible to smoothly perform arm in driving by supplying a set amount of hydraulic oil to the arm cylinder.

따라서, 주행장치와 작업장치를 동시에 구동시켜 복합작업을 수행하는 경우, 가변 오리피스(18)의 스풀 절환량에 의해 붐실린더용 절환밸브(11)의 입구측 포트와 아암실린더용 절환밸브(8)의 입구측 포트의 압력차를 상쇄시킬 수 있다. 이로 인해 작업조건에 따라 제2유압펌프(2)로부터의 작동유를 아암실린더와 붐실린더에 적절하게 분배공급하므로 원활한 복합작업을 수행하여 작업능률을 높일 수 있다.Therefore, when carrying out the combined work by simultaneously driving the traveling device and the work device, the inlet port of the boom cylinder switching valve 11 and the arm cylinder switching valve 8 by the spool switching amount of the variable orifice 18. The pressure difference of the inlet side port of can be canceled out. As a result, the working oil from the second hydraulic pump 2 is properly distributed and supplied to the arm cylinder and the boom cylinder according to the working conditions, thereby increasing the work efficiency by performing a smooth combined operation.

전술한 바와 같이, 본 발명의 실시예에 의한 중장비의 압력보상 유압회로는 아래와 같은 이점을 갖는다.As described above, the pressure compensation hydraulic circuit of the heavy equipment according to the embodiment of the present invention has the following advantages.

굴삭기의 주행장치와 작업장치를 동시에 구동시켜 복합작업을 수행하는 경우, 작업조건에 따라 유압펌프로부터의 작동유를 작업장치에 적절하게 분배공급하여 원활한 복합작업으로 인해 작업성을 향상시킬수 있다.In the case of carrying out the compound work by driving the traveling device and the work device of the excavator at the same time, it is possible to improve the workability due to the smooth compound work by distributing and supplying the hydraulic oil from the hydraulic pump to the work device according to the working conditions.

Claims (2)

가변용량형 제1,2유압펌프;Variable displacement first and second hydraulic pumps; 상기 제1유압펌프의 제1센터바이패스통로에 설치되는 좌주행용 절환밸브 및 아암실린더용 절환밸브;A left driving switching valve and an arm cylinder switching valve installed in the first center bypass passage of the first hydraulic pump; 상기 제2유압펌프의 제2센터바이패스통로에 설치되는 우주행용 절환밸브 및 붐실린더용 절환밸브;A space travel switching valve and a boom cylinder switching valve installed in the second center bypass passage of the second hydraulic pump; 상기 제2센터바이패스통로의 상류측에 설치되고, 주행장치와 작업장치를 구동시키는 작업모드시 외부로부터 신호압 공급으로 절환되며, 절환시 제1유압펌프로부터의 작동유를 좌주행용 및 우주행용 절환밸브에 각각 공급하고, 제2유압펌프로부터의 작동유를 아암실린더용 절환밸브 및 붐실린더용 절환밸브에 각각 공급하는 주행직진밸브; 및It is installed on the upstream side of the second center bypass passage, and is switched to supply of signal pressure from the outside in the working mode for driving the traveling device and the working device, and for switching the hydraulic fluid from the first hydraulic pump for the left driving and space travel. A traveling straight valve for supplying a switching valve and supplying hydraulic oil from the second hydraulic pump to an arm cylinder switching valve and a boom cylinder switching valve, respectively; And 상기 제2유압펌프로부터 아암실린더용 절환밸브에 작동유를 공급하는 병렬유로와, 아암실린더용 절환밸브의 입구측 포트를 연결하는 압력보상유로에 설치되고, 붐상승 신호압력과 아암실린더용 절환밸브의 입구측 포트에 형성되는 압력차에 의해 절환되며, 스풀의 절환량에 따라 제2유압펌프로부터의 작동유를 아암실린더용 절환밸브와 붐실린더용 절환밸브에 분배공급하는 가변 오리피스를 포함하는 것을 특징으로 하는 중장비의 압력보상 유압회로.A parallel flow path for supplying hydraulic oil to the arm cylinder switching valve from the second hydraulic pump, and a pressure compensation flow path connecting the inlet port of the arm cylinder switching valve, and the boom lift signal pressure and the arm cylinder switching valve. And a variable orifice which is switched by the pressure difference formed in the inlet side port and distributes and supplies the hydraulic oil from the second hydraulic pump to the arm cylinder switching valve and the boom cylinder switching valve according to the switching amount of the spool. Pressure compensation hydraulic circuit of heavy equipment. 청구항 1에 있어서, 상기 가변 오리피스는 붐상승 신호압력의 입력으로 절환 시 아암실린더용 절환밸브에 설정량을 초과하여 작동유 공급되는 것을 제한하는 오리피스를 더 포함하는 것을 특징으로 하는 중장비의 압력보상 유압회로. The pressure compensating hydraulic circuit of claim 1, wherein the variable orifice further includes an orifice for restricting supply of hydraulic oil to a switch cylinder for the arm cylinder in excess of a set amount when the variable orifice is switched to an input of a boom rising signal pressure. .
KR1020070045131A 2007-05-09 2007-05-09 Pressure Compensation Hydraulic Circuit of Heavy Equipment Withdrawn KR20080099505A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105518311A (en) * 2014-03-24 2016-04-20 日立建机株式会社 Hydraulic system for work vehicle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105518311A (en) * 2014-03-24 2016-04-20 日立建机株式会社 Hydraulic system for work vehicle

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