KR100753986B1 - Hydraulic circuit for traveling priority - Google Patents

Hydraulic circuit for traveling priority Download PDF

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Publication number
KR100753986B1
KR100753986B1 KR1020060034747A KR20060034747A KR100753986B1 KR 100753986 B1 KR100753986 B1 KR 100753986B1 KR 1020060034747 A KR1020060034747 A KR 1020060034747A KR 20060034747 A KR20060034747 A KR 20060034747A KR 100753986 B1 KR100753986 B1 KR 100753986B1
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KR
South Korea
Prior art keywords
center bypass
valve
traveling
signal pressure
bypass passage
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KR1020060034747A
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Korean (ko)
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김진욱
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볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비
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Priority to KR1020060034747A priority Critical patent/KR100753986B1/en
Priority to US11/732,438 priority patent/US7614225B2/en
Priority to JP2007101288A priority patent/JP5053689B2/en
Priority to EP07007322A priority patent/EP1847654A3/en
Priority to CN2007100970949A priority patent/CN101059138B/en
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Publication of KR100753986B1 publication Critical patent/KR100753986B1/en

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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/2253Controlling the travelling speed of vehicles, e.g. adjusting travelling speed according to implement loads, control of hydrostatic transmission
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/225Control of steering, e.g. for hydraulic motors driving the vehicle tracks
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/2264Arrangements or adaptations of elements for hydraulic drives
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/2278Hydraulic circuits
    • E02F9/2292Systems with two or more pumps
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60YINDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00Type of vehicle
    • B60Y2200/40Special vehicles
    • B60Y2200/41Construction vehicles, e.g. graders, excavators
    • B60Y2200/412Excavators

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

A hydraulic circuit for straight movement is provided to increase operability and workability while traveling by securing the independent traveling against working devices and preventing equipment from traveling eccentrically or suddenly. The hydraulic circuit for straight movement comprises primary and secondary hydraulic pumps(1,2), a primary traveling control valve and control valves(10~13) for working devices such as a swing, a boom, an option device and an arm installed on a primary center bypass passage(20) of the primary hydraulic pump, a primary center bypass change-over valve(19) installed on the lowermost part of the primary center bypass passage and changed over with signal pressure transferred through a pilot passage(26) from the outside, a secondary traveling control valve(14) and control valves(15~17) for working devices such as a boom, a bucket and an arm installed on a secondary center bypass passage(22) of the secondary hydraulic pump, a straight traveling valve installed on the upper part of the secondary center bypass passage and changed over with signal pressure transferred through a pilot passage from the outside to distribute and supply working oil discharged from the primary and secondary hydraulic pumps to traveling and working devices, a secondary center bypass change-over valve(19a) installed on the lowermost part of the secondary center bypass passage and changed over with signal pressure transferred through a pilot passage(27) from the outside, and a remote control valve supplying and changing over pilot signal pressure discharged from a pilot pump(3) when a driver operates a lever into the primary and secondary center bypass change-over valves and the straight traveling valve.

Description

주행직진용 유압회로{hydraulic circuit for traveling priority}Hydraulic Circuit for Traveling Priority

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

도 2는 본 발명의 일실시예에 의한 주행직진용 유압회로도,2 is a hydraulic circuit diagram for driving straight according to an embodiment of the present invention;

도 3은 본 발명의 다른 실시예에 의한 주행직진용 유압회로도이다.3 is a hydraulic circuit diagram for driving straight according to another 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; 제2유압펌프2; 2nd hydraulic pump

3; 파일럿 펌프3; Pilot pump

4; 주행직진 밸브4; Travel straight valve

9; 제1주행 제어밸브9; First run control valve

14; 제2주행 제어밸브14; 2nd run control valve

19; 제1센터바이패스 절환밸브19; 1st center bypass switching valve

19a; 제2센터바이패스 절환밸브19a; 2nd center bypass switching valve

20; 제1센터바이패스통로20; Center 1 bypass passage

22; 제2센터바이패스통로22; 2nd Center Bypass Path

25; 가변 오리피스25; Adjustable orifice

본 발명은 복수의 유압펌프가 사용되는 중장비의 주행과 작업장치를 동시에 조작하여 복합작업을 하는 경우에도 장비의 주행 조작성을 향상시키도록 한 주행직진용 유압회로에 관한 것이다.The present invention relates to a hydraulic linear circuit for traveling straight to improve the driving operability of the equipment even when the operation of the heavy equipment using a plurality of hydraulic pumps and the operation device at the same time to perform a complex operation.

더욱 상세하게는, 도심지 등에서 배수관 등의 파이프를 도로에 매설하는 작업에서와 같이 작업장치의 미세한 조작과 미세한 주행이 동시에 요구되는 복합작업을 하는 경우, 작업장치와 독립적인 주행이 가능하여 장비의 편주행 또는 급주행을 방지할 수 있도록 한 주행직진용 유압회로에 관한 것이다.More specifically, in the case of a complex work requiring fine manipulation of a work device and a fine running at the same time as in a work in which a pipe such as a drainage pipe is buried on a road in a downtown area, etc., it is possible to run independently of the work device. The present invention relates to a hydraulic circuit for driving straight to prevent running or rapid driving.

일반적으로, 복수의 유압펌프가 사용되는 굴삭기와 같은 건설중장비의 작업장치와 주행을 동시에 조작하는 경우에, 주행 직진성을 확보하여 작업장치의 부하에 대해 독립적인 주행이 가능하도록 일측 유압펌프의 상류측에 주행직진 밸브를 설치하여, 주행과 작업장치의 조작신호를 받아 주행직진 밸브를 절환하는 유압회로가 사용된다.In general, when operating a work device of a heavy construction equipment such as an excavator in which a plurality of hydraulic pumps are used and driving at the same time, the upstream side of the one side hydraulic pump to ensure the traveling straightness to enable independent travel to the load of the work device A hydraulic linear circuit is installed in the driving linear valve, and the driving linear valve is switched in response to the operation signal of the driving device and the work device.

도 1에 도시된 바와 같이, 종래 기술에 의한 유압회로는, 복수의 제1,2유압펌프(1,2) 및 파일럿 펌프(3)와, 제1유압펌프(1)의 제1센터바이패스통로(20)에 좌 측 주행모터(8)용 제1주행 제어밸브(9)와, 스윙(swing) 제어밸브(10)와, 붐(boom) 제어밸브(11)와, 옵션장치(option device) 제어밸브(12) 및 아암(arm) 제어밸브(13)가 설치되고, 제2유압펌프(2)의 제2센터바이패스통로(22)에 우측 주행모터(8a)용 제2주행 제어밸브(14)와, 붐 제어밸브(15)와, 버킷(bucket) 제어밸브(16) 및 아암 제어밸브(17)가 설치된다.As shown in FIG. 1, the hydraulic circuit according to the prior art includes a plurality of first and second hydraulic pumps 1 and 2, a pilot pump 3, and a first center bypass of the first hydraulic pump 1. The first driving control valve 9 for the left driving motor 8, the swing control valve 10, the boom control valve 11, and an option device in the passage 20. ) A control valve 12 and an arm control valve 13 are installed, and a second traveling control valve for the right traveling motor 8a in the second center bypass passage 22 of the second hydraulic pump 2. 14, a boom control valve 15, a bucket control valve 16 and an arm control valve 17 are provided.

즉, 전술한 제1유압펌프(1)로 부터 토출되는 작동유는 좌측 주행모터(8) 및 작업장치를 구동시키고, 제2유압펌프(2)로 부터 토출되는 작동유는 우측 주행모터(8a) 및 작업장치를 구동시킨다.That is, the hydraulic oil discharged from the above-mentioned first hydraulic pump 1 drives the left traveling motor 8 and the work device, and the hydraulic oil discharged from the second hydraulic pump 2 is the right traveling motor 8a and Drive the work tool.

이때, 작업장치와 주행장치를 동시에 조작하여 복합작업을 하게되는 경우, 장비의 편주행 또는 급주행되는 것을 방지할 수 있도록 파일럿 펌프(3)로부터의 파일럿 신호압에 의해 절환되는 주행직진 밸브(4)를 제2센터바이패스통로(22)의 상류측에 설치한다.At this time, when the work device and the traveling device are operated at the same time to carry out the combined work, the traveling straight valve 4 switched by the pilot signal pressure from the pilot pump 3 to prevent the equipment from traveling unevenly or rapidly. ) Is installed upstream of the second center bypass passage 22.

이로 인해, 작업장치와 주행을 동시에 구동하는 복합작업시 주행 직진성을 확보할 수 있도록 주행진진 밸브(4)를 파일럿 펌프(3)로부터의 파일럿 신호압에 의해 절환하는 경우, 제1유압펌프(1)로 부터 토출되는 작동유 일부는 제1센터바이패스통로(20)를 거쳐 제1주행 제어밸브(9)에 공급된다. 동시에 제1유압펌프(1)의 작동유 일부는 통로(21)와, 절환된 주행직진 밸브(4)를 차례로 경유하여 제2센터바이패스통로(22)를 거쳐 제2주행 제어밸브(14)에 공급된다.For this reason, when the traveling vibration valve 4 is switched by the pilot signal pressure from the pilot pump 3 so as to ensure the traveling straightness during the combined operation of simultaneously driving the work device and the traveling, the first hydraulic pump 1 A part of the hydraulic oil discharged from) is supplied to the first travel control valve 9 via the first center bypass passage 20. At the same time, a part of the hydraulic oil of the first hydraulic pump 1 passes through the passage 21 and the switched traveling straight valve 4 through the second center bypass passage 22 to the second running control valve 14. Supplied.

한편, 제2유압펌프(2)로 부터 토출되는 작동유 일부는 통로(23)를 거쳐 우측의 작업장치에 공급되고, 동시에 제2유압펌프(2)의 작동유 일부는 절환된 주행직진 밸브(4)와 통로(24)를 차례로 경유하여 좌측의 작업장치에 공급된다. 즉 제1유압펌프(1)로부터의 작동유는 장비의 주행 구동을 담당하고 제2유압펌프(2)로부터의 작동유는 좌,우측 작업장치 구동을 담당한다.On the other hand, a part of the hydraulic oil discharged from the second hydraulic pump 2 is supplied to the work device on the right through the passage 23, and at the same time a part of the hydraulic oil of the second hydraulic pump 2 is switched traveling straight valve (4) It is supplied to the work device on the left side through and the passage 24 in order. That is, the hydraulic oil from the first hydraulic pump 1 is responsible for driving driving of the equipment, and the hydraulic oil from the second hydraulic pump 2 is responsible for driving the left and right working devices.

종래 기술의 유압회로 구조는, 전술한 주행직진 밸브(4)를 절환시켜 장비의 주행과 작업장치를 동시에 구동하여 복합작업을 수행할 경우, 통로(24)에 형성되는 좌측 작업장치의 고부하에 해당되는 압력 및 통로(23)에 형성되는 우측 작업장치의 고부하 압력이 고정 오리피스(7) 및 체크밸브를 경유하여 제2주행 제어밸브(14)에 공급된다.The hydraulic circuit structure of the prior art corresponds to the high load of the left work device formed in the passage 24 when the above traveling straight valve 4 is switched to drive the machine and the work device at the same time to perform a compound work. The pressure and the high load pressure of the right working device formed in the passage 23 are supplied to the second travel control valve 14 via the fixed orifice 7 and the check valve.

이로 인해, 장비의 완전한 주행직진이 되지않고 좌,우측 주행압력이 동일하지않아 장비의 편주행이 발생되거나, 또는 갑작스런 주행측에 유량 공급으로 인해 급주행 등의 쇼크가 발생된다. 또는 주행측 압력이 높고 상대적으로 작업장치측 압력이 낮을 경우에 작업장치측으로 유량이 유입되어 주행속도가 떨어진다. 이로 인해 장비의 주행 조작성 및 작업의 효율이 떨어지는 문제점을 갖는다.As a result, the driving of the equipment does not go straight and the left and right driving pressures are not the same, so that the traveling of the equipment occurs, or the sudden driving, such as the rapid running, causes a sudden driving. Alternatively, when the driving pressure is high and the working device pressure is relatively low, the flow rate flows into the working device and the driving speed drops. As a result, the driving operability of the equipment and the efficiency of work are deteriorated.

즉, 도심지에서 대형 배수관 등의 중량의 파이프를 도로에 매설하는 작업시, 주행직진 밸브(4)를 절환시킨 상태에서 제1,2주행 제어밸브(9,14)의 조작레버를 풀 스트로크(full stroke) 상태가 아닌 중간정도의 미세한 조작(half lever)과, 붐 아암 버킷 등의 작업장치용 조작레버를 미세하게 조작(half lever)하면서 고부하(高負荷) 작업을 하게 된다.That is, when the pipe of heavy weight such as a large drainage pipe is buried on the road in the downtown area, the operation levers of the first and second running control valves 9 and 14 are full strokes with the traveling straight valve 4 switched. High-load work is carried out with a half lever that is not in a stroke state and a half lever that is fine for a work lever such as a boom arm bucket.

이때, 좌측 작업장치용 제어밸브(10-13)의 조작레버와 우측 작업장치용 제어밸브(15-17)의 조작레버를 풀 스트로크(full stroke) 상태가 아닌 중간정도의 미세 조작(half lever)시에는 제1,2센터바이패스통로(20,22)가 완전하게 닫힌상태가 아니고 반쪽만큼 개방된 상태이다.At this time, the operation lever of the control valve for the left work device 10-13 and the control lever for the control device 15-17 for the right work device are not half-stroked in full stroke state. In the city, the first and second center bypass passages 20 and 22 are not completely closed, but are opened by half.

이로 인해, 제1유압펌프(1)의 작동유는 장비의 주행을 담당하고 제2유압펌프(2)의 작동유는 좌,우측 작업장치 구동을 담당하는 완전한 역할분담이 이루어지지 않는다.Thus, the hydraulic fluid of the first hydraulic pump 1 is responsible for the running of the equipment and the hydraulic fluid of the second hydraulic pump 2 does not have a complete role sharing for driving the left and right work devices.

전술한 제1주행 제어밸브(9)가 미세조작(half lever)으로 인해 반쪽만큼 절환된 경우, 제1유압펌프(1)로부터의 작동유는 제1센터바이패스통로(20)와 제1주행 제어밸브(9)를 경유하여 하류측 작업장치용 제어밸브(10-13)의 센터바이스패스통로에 공급된다.When the above-described first travel control valve 9 is switched by half due to the half lever, the hydraulic oil from the first hydraulic pump 1 is transferred to the first center bypass passage 20 and the first travel control. Via the valve 9, it is supplied to the center bypass path of the control valve 10-13 for downstream work devices.

이때, 하류측 작업장치용 제어밸브(10-13)의 절환유무, 또는 절환 스트로크에 따라 제1유압펌프(1)측에 걸리는 압력은 순수한 주행만의 압력이 아닌 하류측 작업장치용 제어밸브(10-13)의 스트로크에 따라 압력이 변한다.At this time, the pressure applied to the first hydraulic pump 1 side in accordance with the presence or absence of the switching of the control valve 10-13 for the downstream work device or the switching stroke is not a pure running pressure but a control valve for the downstream work device ( The pressure changes according to the stroke of 10-13).

이로 인해, 하류측 작업장치용 제어밸브(10-13)의 스풀 조작에 따라 제1유압펌프(1)에서 토출된 후 제1센터바이패스통로(20)와 유압탱크(18)로 흐르는 작동유 이동통로를 차단한다. 제1유압펌프(1)의 토출압력을 상승시키므로 제1유압펌프(1)에 걸리는 주행측 압력을 상승시킨다. 이때 제2유압펌프(2)측 제2주행 제어밸브(14)와 하류측 작업장치(15-17)도 동일하게 적용된다.For this reason, the hydraulic fluid moves in the first center bypass passage 20 and the hydraulic tank 18 after being discharged from the first hydraulic pump 1 according to the spool operation of the control valve 10-13 for the downstream work device. Block the passage. Since the discharge pressure of the first hydraulic pump 1 is increased, the traveling side pressure applied to the first hydraulic pump 1 is increased. At this time, the second traveling control valve 14 and the downstream work device 15-17 on the second hydraulic pump 2 are equally applied.

따라서, 작업장치에 발생되는 부하 압력이 커질수록 작업장치의 고부하에 해당되는 압력이 고정 오리피스(7)와 체크밸브를 경유하여 제2주행 제어밸브(14)측으로 이동되므로 우측 주행모터(8a)측 압력을 상승시킨다.Therefore, as the load pressure generated in the work device increases, the pressure corresponding to the high load of the work device is moved to the second driving control valve 14 side via the fixed orifice 7 and the check valve, so that the right traveling motor 8a side Raise the pressure.

이로 인해, 작업장치와 독립적인 주행이 보장되지않고 작업장치용 제어밸브의 절환에 따른 압력을 공급받게 되므로, 좌,우측 주행압력이 서로 맞지않아 장비의 편주행 또는 급주행이 발생되어 주행 조작성이 떨어진다.As a result, the driving is not guaranteed independent of the work device and is supplied with the pressure according to the switching of the control valve for the work device. Falls.

또한, 주행측 압력이 높고 상대적으로 작업장치측 압력이 낮을 경우, 작동유가 작업장치쪽으로 이동되므로 주행속도가 떨어져 작업 효율성이 떨어지는 문제점을 갖는다.In addition, when the running pressure is high and the work device side pressure is relatively low, since the hydraulic fluid is moved to the work device has a problem that the running speed is lowered, the work efficiency is lowered.

따라서, 본 발명의 목적은, 작업장치의 미세한 조작과 미세한 주행이 동시에 요구되는 복합작업을 하는 경우, 작업장치와 독립적인 주행이 가능하여 장비의 급격한 편주행 또는 급주행을 방지하여 주행 조작성을 향상시키고, 작업 능률을 향상시키도록 한 주행직진용 유압회로를 제공함에 있다.Accordingly, an object of the present invention, when a complex operation requiring a fine operation and a fine running of the work device at the same time, it is possible to run independently of the work device to prevent the sudden flight or rapid running of the equipment to improve the driving operability It is to provide a hydraulic circuit for driving straight to improve the work efficiency.

전술한 본 발명의 목적은, 제1,2유압펌프와,The above object of the present invention, the first and second hydraulic pumps,

제1유압펌프의 제1센터바이패스통로에 설치되는 제1주행 제어밸브 및 작업장치용 제어밸브와,A first traveling control valve and a control valve for a work device installed in the first center bypass passage of the first hydraulic pump;

제1센터바이패스통로 최하류측에 설치되고, 외부로 부터 신호압 인가시 절환되는 제1센터바이패스 절환밸브와,A first center bypass switching valve installed at the most downstream side of the first center bypass passage and switched when an external signal pressure is applied;

제2유압펌프의 제2센터바이패스통로에 설치되는 제2주행 제어밸브 및 작업장 치용 제어밸브와,A second driving control valve and a workplace control valve installed in a second center bypass passage of the second hydraulic pump;

제2센터바이패스통로 상류측에 설치되고, 외부로 부터 신호압 인가시 절환되어 제1,2유압펌프로 부터 토출되는 작동유를 주행과 작업장치에 분배공급하는 주행직진 밸브와,A traveling straight valve installed at an upstream side of the second center bypass passage and switching and supplying the hydraulic fluid discharged from the first and second hydraulic pumps when the signal pressure is applied from the outside to the traveling and work devices;

제2센터바이패스통로 최하류측에 설치되고, 외부로 부터 신호압 인가시 절환되는 제2센터바이패스 절환밸브를 구비하여,A second center bypass switching valve is provided on the downstream side of the second center bypass passage and is switched when the signal pressure is applied from the outside.

장비의 주행과 작업장치를 동시에 구동하여 복합작업하는 경우, 주행직진 밸브를 절환시키는 신호압에 의해 제1,2센터바이패스 절환밸브를 절환시켜 제1,2센터바이패스통로의 개도를 줄여 작업장치와 주행을 독립적으로 구동할 수 있는 것을 특징으로 하는 주행직진용 유압회로를 제공함에 의해 달성된다.In the case of complex work by driving the equipment and work equipment at the same time, reduce the opening degree of the 1st and 2nd center bypass passage by switching the 1st and 2nd center bypass switching valve by the signal pressure to switch the traveling straight valve. It is achieved by providing a hydraulic circuit for traveling straight, characterized in that the device and the driving can be driven independently.

전술한 본 발명의 목적은, 제1,2유압펌프와,The above object of the present invention, the first and second hydraulic pumps,

제1유압펌프의 제1센터바이패스통로에 설치되는 제1주행 제어밸브 및 작업장치용 제어밸브와,A first traveling control valve and a control valve for a work device installed in the first center bypass passage of the first hydraulic pump;

제1센터바이패스통로 최하류측에 설치되고, 외부로 부터 신호압 인가시 절환되는 제1센터바이패스 절환밸브와,A first center bypass switching valve installed at the most downstream side of the first center bypass passage and switched when an external signal pressure is applied;

제2유압펌프의 제2센터바이패스통로에 설치되는 제2주행 제어밸브 및 작업장치용 제어밸브와,A second running control valve and a control valve for a work device installed in a second center bypass passage of the second hydraulic pump;

제2센터바이패스통로 상류측에 설치되고, 외부로 부터 신호압 인가시 절환되어 제1,2유압펌프로 부터 토출되는 작동유를 주행과 작업장치에 분배공급하는 주행 직진 밸브와,A traveling straight valve installed at an upstream side of the second center bypass passage and for distributing and supplying the hydraulic fluid discharged from the first and second hydraulic pumps when the signal pressure is applied from the outside to the traveling device and the work device;

제2센터바이패스통로의 상류측에서 분기된 통로와 제2센터바이패스통로를 병렬연결한 합류통로에 설치되고, 외부로 부터 신호압 인가시 절환되어 작업장치에서 주행측으로 작동유 이동을 차단하는 가변 오리피스와,It is installed in the conduit which connects the passage branched upstream of the 2nd center bypass passage and the 2nd center bypass passage in parallel, and it is switched when the signal pressure is applied from the outside, and it switches the hydraulic fluid from the work device to the running side to block. Orifice,

제2센터바이패스통로 최하류측에 설치되고, 외부로 부터 신호압 인가시 절환되는 제2센터바이패스 절환밸브를 구비하여,A second center bypass switching valve is provided on the downstream side of the second center bypass passage and is switched when the signal pressure is applied from the outside.

장비의 주행과 작업장치를 동시에 구동하여 복합작업하는 경우, 주행직진 밸브를 절환시키는 신호압에 의해 가변 오리피스 및 제1,2센터바이패스 절환밸브를 절환시켜 제1,2센터바이패스통로의 개도를 줄여 작업장치와 주행을 독립적으로 구동할 수 있는 것을 특징으로 하는 주행직진용 유압회로를 제공함에 의해 달성된다.In case of complex work by driving the machine and work equipment at the same time, open the 1st and 2nd center bypass passage by switching the variable orifice and the 1st, 2nd center bypass switching valve by the signal pressure to switch the driving straight valve. It is achieved by providing a hydraulic circuit for driving straight, characterized in that to reduce the driving device and the driving can be driven independently.

이때, 운전자에 의한 레버 조작시 파일럿 펌프로 부터 토출되는 파일럿 신호압을 제1,2센터바이패스 절환밸브, 주행직진 밸브 또는 가변 오리피스에 공급하여 절환시키는 리모트컨트롤밸브를 더 구비할 수 있다.In this case, the remote control valve may be further provided to switch the pilot signal pressure discharged from the pilot pump when the driver operates the lever to the first and second center bypass switching valves, the traveling straight valve, or the variable orifice.

이하, 본 발명의 바람직한 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.Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, which are intended to describe in detail enough to enable those skilled in the art to easily practice the invention, and therefore It does not mean that the technical spirit and scope of the present invention is limited.

도 2에 도시된 바와 같이, 본 발명에 의한 주행직진용 유압회로는, 제1,2유 압펌프(1,2)와,As shown in FIG. 2, the hydraulic circuit for driving straight according to the present invention includes first and second hydraulic pumps 1 and 2, and

제1유압펌프(1)의 제1센터바이패스통로(20)에 설치되는 제1주행 제어밸브(9) 및 작업장치(스윙(swing), 붐(boom), 옵션장치(option device), 아암(arm)을 말함)용 제어밸브(10-13)와,The first traveling control valve 9 and the working device (swing, boom, option device, arm) installed in the first center bypass passage 20 of the first hydraulic pump 1 control valve (10-13),

제1센터바이패스통로(20) 최하류측에 설치되고, 외부로 부터 파일럿 통로(26)를 통하여 신호압 인가시 절환되는 제1센터바이패스 절환밸브(19)와,A first center bypass switching valve 19 installed at the most downstream side of the first center bypass passage 20 and switched when the signal pressure is applied from the outside through the pilot passage 26;

제2유압펌프(2)의 제2센터바이패스통로(22)에 설치되는 제2주행 제어밸브(14) 및 작업장치(붐, 버킷(bucket), 아암을 말함)용 제어밸브(15-17)와,Control valve (15-17) for the second traveling control valve 14 and the working device (referring to boom, bucket, and arm) installed in the second center bypass passage 22 of the second hydraulic pump 2 )Wow,

제2센터바이패스통로(22) 상류측에 설치되고, 외부로 부터 파일럿 통로를 통하여 신호압 인가시 절환되어 제1,2유압펌프(1,2)로 부터 토출되는 작동유를 주행과 작업장치에 분배공급하는 주행직진 밸브(4)와,The operating oil installed at the upstream side of the second center bypass passage 22 and switched when the signal pressure is applied from the outside through the pilot passage is discharged from the first and second hydraulic pumps 1 and 2 to the traveling and work devices. A traveling straight valve 4 for dispensing and supplying

제2센터바이패스통로(22) 최하류측에 설치되고, 외부로 부터 파일럿 통로(27)를 통하여 신호압 인가시 절환되는 제2센터바이패스 절환밸브(19a)를 구비하여,The second center bypass passage 22 is provided on the most downstream side, and is provided with a second center bypass switching valve 19a which is switched when the signal pressure is applied through the pilot passage 27 from the outside,

장비의 주행과 작업장치를 동시에 구동하여 복합작업하는 경우, 주행직진 밸브(4)를 절환시키는 신호압에 의해 제1,2센터바이패스 절환밸브(19,19a)를 절환시켜 제1,2센터바이패스통로(20,22)의 개도를 줄여 작업장치와 주행을 독립적으로 구동할 수 있다.In the case of complex work by simultaneously driving the machine and the work device, the first and second center bypass switching valves 19 and 19a are switched by the signal pressure to switch the traveling straight valve 4 to the first and second center. By reducing the opening degree of the bypass passages 20 and 22, the work device and the driving can be driven independently.

이때, 운전자에 의한 레버 조작시 파일럿 펌프(3)로 부터 토출되는 파일럿 신호압을 제1,2센터바이패스 절환밸브(19,19a) 및 주행직진 밸브(4)에 공급하여 절 환시키는 리모트컨트롤밸브(RCV)(미도시됨)가 사용될 수 있다.At this time, the remote control for supplying and switching the pilot signal pressure discharged from the pilot pump 3 to the first and second center bypass switching valves 19 and 19a and the traveling straight valve 4 when the driver operates the lever. Valve RCV (not shown) may be used.

도면중 미 설명부호 5는 밸브스프링이고, 6은 체크밸브이며, 7은 고정 오리피스이다.In the figure, reference numeral 5 denotes a valve spring, 6 denotes a check valve, and 7 denotes a fixed orifice.

이하에서, 본 발명에 의한 주행직진용 유압회로의 사용예를 첨부된 도면을 참조하여 설명한다.Hereinafter, with reference to the accompanying drawings an example of the use of the hydraulic circuit for traveling straight according to the present invention.

도 2에 도시된 바와 같이, 중장비의 주행과 작업장치를 동시에 조작하여 복합작업(예를들어, 도심지에서 중량의 배수관 등을 도로에 매설하는 작업을 말함)을 하는 경우, 운전자에 의한 레버(미도시됨) 조작으로 파일럿 펌프(3)로 부터 토출되는 파일럿 신호압이 주행직진 밸브(4)에 인가되어 내부 스풀을 도면상, 우측방향으로 절환시킨다(이때 밸브스프링(5)은 압축된다).As shown in FIG. 2, when a heavy work machine and a work device are operated at the same time to perform a compound work (for example, to bury a heavy drain pipe on a road in a downtown area), a lever by a driver The pilot signal pressure discharged from the pilot pump 3 by the operation is applied to the traveling straight valve 4 to switch the inner spool to the right side in the drawing (at this time, the valve spring 5 is compressed).

동시에, 전술한 파일럿 신호압이 파일럿 통로(26)를 통해 제1센터바이패스통로(20)의 최하류측에 설치된 제1센터바이패스 절환밸브(19)에 공급되어 내부 스풀을 도면상, 우측방향으로 절환시킨다. 또한 파일럿 신호압이 파일럿 통로(27)를 통해 제2센터바이패스통로(22)의 최하류측에 설치된 제2센터바이패스 절환밸브(19a)에 공급되어 내부 스풀을 도면상, 좌측방향으로 절환시킨다.At the same time, the above-described pilot signal pressure is supplied to the first center bypass switching valve 19 provided on the most downstream side of the first center bypass passage 20 through the pilot passage 26, so that the internal spool is shown on the right side in the drawing. Switch direction. In addition, the pilot signal pressure is supplied to the second center bypass switching valve 19a provided on the most downstream side of the second center bypass passage 22 through the pilot passage 27 to switch the internal spool to the left in the drawing. Let's do it.

따라서, 제1유압펌프(1)로 부터 토출되는 작동유 일부는 제1센터바이패스통로(20)를 거쳐 좌측 주행모터(8)용 제1주행 제어밸브(9)에 공급되고, 동시에 제1유압펌프(1)의 작동유 일부는 통로(21)와, 절환된 주행직진 밸브(4)를 차례로 경유하 여 제2센터바이패스통로(22)에 설치된 우측 주행모터(8a)용 제2주행 제어밸브(14)에 공급된다.Therefore, a part of the hydraulic oil discharged from the first hydraulic pump 1 is supplied to the first running control valve 9 for the left traveling motor 8 via the first center bypass passage 20 and at the same time the first hydraulic pressure A part of the hydraulic oil of the pump 1 passes through the passage 21 and the switched traveling straight valve 4 in order, and the second running control valve for the right traveling motor 8a installed in the second center bypass passage 22. 14 is supplied.

한편, 제2유압펌프(2)로 부터 토출되는 작동유 일부는 통로(23)를 거쳐 우측의 작업장치에 공급되고, 동시에 제2유압펌프(2)의 작동유 일부는 절환된 주행직진 밸브(4)와 통로(24)를 차례로 경유하여 좌측의 작업장치에 공급된다.On the other hand, a part of the hydraulic oil discharged from the second hydraulic pump 2 is supplied to the work device on the right through the passage 23, and at the same time a part of the hydraulic oil of the second hydraulic pump 2 is switched traveling straight valve (4) It is supplied to the work device on the left side through and the passage 24 in order.

이로 인해, 전술한 제1,2주행 제어밸브(9,14)의 하류측에 설치된 작업장치용 제어밸브(10-13)(15-17)중 어느 하나를 절환시키는 경우, 제1,2유압펌프(1,2)에서 토출되어 제1,2센터바이패스통로(20,22)를 경유하여 유압탱크(18)로 흐르는 작동유의 압력은 제1,2센터바이패스 절환밸브(19,19a)의 절환되는 개도에 대응되게 형성된다(즉 제1,2센터바이패스통로(20,22)에 좌우측 압력차 없이 동일한 압력이 형성되는 것을 말함).For this reason, when switching any one of the control valve 10-13 (15-17) for working apparatuses installed in the downstream of the above-mentioned 1st, 2nd running control valve 9, 14, the 1st, 2nd hydraulic pressure The pressure of the hydraulic fluid discharged from the pumps 1 and 2 and flowing into the hydraulic tank 18 via the first and second center bypass passages 20 and 22 is the first and second center bypass switching valves 19 and 19a. It is formed to correspond to the opening degree of switching (that is, the same pressure is formed in the first and second center bypass passages 20 and 22 without the left and right pressure difference).

또한, 제1,2센터바이패스통로(20,22)의 상류측에 설치된 제1,2주행 제어밸브(9,14)중 어느 하나를 절환시키는 경우에도 제1,2유압펌프(1,2)로 부터 토출되어 제1,2센터바이패스통로(20,22)에 형성되는 좌우측 작동유 압력차는 발생되지 않는다.Further, the first and second hydraulic pumps 1 and 2 are also used to switch any one of the first and second running control valves 9 and 14 provided upstream of the first and second center bypass passages 20 and 22. The pressure difference between the left and right hydraulic fluids formed in the first and second center bypass passages 20 and 22 is not generated.

따라서, 중장비의 주행과 작업장치를 동시에 조작하여 복합작업을 하기 위하여 작업장치와 주행을 미세하게 조작하는 경우에도 장비의 편주행이 발생되지 않는다.Therefore, even when the work device and the drive are finely operated in order to perform the composite work by simultaneously operating the traveling device and the working device of the heavy equipment, the traveling of the equipment does not occur.

한편, 각 작업장치용 제어밸브(10-13)(15-17)의 절환압력 또는 스트로크를 감안하여 제1,2유압펌프(1,2)에서 제1,2센터바이패스통로(20,22)로 형성되는 개도 량보다 제1,2센터바이패스 절환밸브(19,19a)의 절환에 따른 개도량은 상대적으로 작아야 한다.On the other hand, the first and the second center bypass passages 20 and 22 in the first and second hydraulic pumps 1 and 2 in consideration of the switching pressure or the stroke of the control valves 10-13 and 15-17 for each work device. The opening amount according to the switching of the first and second center bypass switching valves 19 and 19a should be relatively smaller than the opening amount formed by).

도 3에 도시된 바와 같이, 본 발명의 다른 실시예에 의한 주행직진용 유압회로는, 제1,2유압펌프(1,2)와,As shown in FIG. 3, the hydraulic circuit for driving straight according to another embodiment of the present invention includes first and second hydraulic pumps 1 and 2, and

제1유압펌프(1)의 제1센터바이패스통로(20)에 설치되는 제1주행 제어밸브(9) 및 작업장치(스윙, 붐, 옵션장치, 아암을 말함)용 제어밸브(10-13)와,Control valves 10-13 for the first traveling control valve 9 and work devices (swings, booms, option devices, and arms) installed in the first center bypass passage 20 of the first hydraulic pump 1. )Wow,

제1센터바이패스통로(20) 최하류측에 설치되고, 외부로 부터 파일럿 통로(26)를 통하여 신호압 인가시 절환되는 제1센터바이패스 절환밸브(19)와,A first center bypass switching valve 19 installed at the most downstream side of the first center bypass passage 20 and switched when the signal pressure is applied from the outside through the pilot passage 26;

제2유압펌프(2)의 제2센터바이패스통로(22)에 설치되는 제2주행 제어밸브(14) 및 작업장치(붐, 버킷, 아암을 말함)용 제어밸브(15-17)와,A control valve (15-17) for the second traveling control valve (14) and the working device (referred to as boom, bucket, and arm) installed in the second center bypass passage (22) of the second hydraulic pump (2);

제2센터바이패스통로(22) 상류측에 설치되고, 외부로 부터 신호압 인가시 절환되어 제1,2유압펌프(1,2)로 부터 토출되는 작동유를 주행과 작업장치에 분배공급하는 주행직진 밸브(4)와,It is installed on the upstream side of the second center bypass passage 22, and is switched when the signal pressure is applied from the outside and travels to distribute and supply hydraulic oil discharged from the first and second hydraulic pumps 1 and 2 to the traveling device and the work device. With a straight valve (4),

제2센터바이패스통로(22)의 상류측에서 분기된 통로(23)와 제2센터바이패스통로(22)를 병렬연결한 합류통로(29)(작업장치측 작동유 일부를 주행측으로 합류시키는 통로를 말함)에 설치되고, 외부로 부터 신호압 인가시 절환되어 작업장치에서 주행측으로 작동유 이동되는 것을 차단하는 가변 오리피스(25)와,A confluence passage 29 in which the passage 23 branched from the upstream side of the second center bypass passage 22 and the second center bypass passage 22 are connected in parallel (a passage for joining a part of the working device side hydraulic oil to the traveling side). And a variable orifice 25 installed at the outside and switching when the signal pressure is applied from the outside to block the moving of the hydraulic oil from the work device to the traveling side,

제2센터바이패스통로(22) 최하류측에 설치되고, 외부로 부터 파일럿 통로(27)를 통하여 신호압 인가시 절환되는 제2센터바이패스 절환밸브(19a)를 구비하 여,The second center bypass passage 22 is provided on the most downstream side, and has a second center bypass switching valve 19a that is switched when the signal pressure is applied through the pilot passage 27 from the outside.

장비의 주행과 작업장치를 동시에 구동하여 복합작업하는 경우, 주행직진 밸브(4)를 절환시키는 신호압에 의해 가변 오리피스(25) 및 제1,2센터바이패스 절환밸브(19,19a)를 절환시켜 제1,2센터바이패스통로(20,22)의 개도를 줄여 작업장치와 주행을 독립적으로 구동할 수 있다.In the case of complex work by driving the machine and work equipment simultaneously, the variable orifice 25 and the first and second center bypass switching valves 19 and 19a are switched by the signal pressure for switching the traveling straight valve 4. By reducing the opening degree of the first and second center bypass passages 20 and 22, the work device and the driving can be driven independently.

이때, 운전자에 의한 레버 조작시 파일럿 펌프(3)로 부터 토출되는 파일럿 신호압을 제1,2센터바이패스 절환밸브(19,19a), 가변 오리피스(25) 및 주행직진 밸브(4)에 공급하여 절환시키는 리모트컨트롤밸브(RCV)(미도시됨)가 사용될 수 있다.At this time, the pilot signal pressure discharged from the pilot pump 3 when the lever is operated by the driver is supplied to the first and second center bypass switching valves 19 and 19a, the variable orifice 25 and the traveling straight valve 4. By using a remote control valve (RCV) (not shown) that can be switched.

도면중 미 설명부호 5는 밸브스프링이고, 6은 체크밸브이며, 30은 밸브스프링이다.In the figure, reference numeral 5 denotes a valve spring, 6 denotes a check valve, and 30 denotes a valve spring.

본 발명의 다른 실시예에 의한 주행직진용 유압회로의 사용예를 설명하되, 전술한 합류통로(29)에 설치되며 주행직진 밸브(4) 및 제1,2센터바이패스 절환밸브(19,19a)를 절환시키는 파일럿 신호압에 의해 절환되는 가변 오리피스(25)를 제외한 것은, 도 2에 도시된 것과 실질적으로 동일하므로 이들의 상세한 설명은 생략하고, 중복되는 도면부호는 동일하게 표기한다.The use example of the traveling straight hydraulic circuit according to another embodiment of the present invention will be described, but is installed in the above-described confluence passage 29 and the traveling straight valve 4 and the first and second center bypass switching valves 19 and 19a. Except for the variable orifice 25 which is switched by the pilot signal pressure for switching), the detailed description thereof is omitted, and the same reference numerals are the same.

중장비의 주행과 작업장치를 동시에 조작하여 복합작업을 하는 경우, 운전자에 의한 레버 조작으로 인해 파일럿 펌프(3)로 부터 토출되는 파일럿 신호압이 주행직진 밸브(4)에 인가되어 내부 스풀을 도면상, 우측방향으로 절환시킨다(이때 밸브스프링(5)은 압축된다).In case of complex work by operating heavy equipment and working device at the same time, pilot signal pressure discharged from pilot pump 3 is applied to driving straight valve 4 due to lever operation by driver, and the internal spool is shown on the drawing. , Switch to the right direction (the valve spring 5 is compressed).

동시에, 전술한 파일럿 신호압이 파일럿 통로(26,27)를 통하여 제1,2센터바이패스통로(20,22)의 최하류측에 설치된 제1,2센터바이패스 절환밸브(19,19a)를 각각 절환시킨다. 또한 파일럿 신호압이 가변 오리피스(25)를 도면상, 상측방향으로 절환시킨다(이때 밸브스프링(39)는 압축된다).At the same time, the first and second center bypass switching valves 19 and 19a provided with the pilot signal pressure described above are provided on the downstream side of the first and second center bypass passages 20 and 22 through the pilot passages 26 and 27. Switch each of them. In addition, the pilot signal pressure switches the variable orifice 25 upward in the figure (at this time, the valve spring 39 is compressed).

즉, 가변 오리피스(25)의 절환으로 인해 오리피스의 단면적이 완전 폐쇄상태에 가깝게 전환된다. 즉 제1,2유압펌프(1,2)에서 토출되어 제1,2센터바이패스통로(20,22)를 경유하여 유압탱크(18)로 흐르는 작동유의 압력은 제1,2센터바이패스 절환밸브(19,19a)의 절환되는 개도에 대응되게 형성된다. 이로 인해 제1,2센터바이패스통로(20,22)에 형성되는 좌,우측 작동유 압력차는 발생되지 않는다.That is, due to the switching of the variable orifice 25, the cross-sectional area of the orifice is switched close to the fully closed state. That is, the pressure of the hydraulic oil discharged from the first and second hydraulic pumps 1 and 2 and flowing into the hydraulic tank 18 via the first and second center bypass passages 20 and 22 is switched to the first and second center bypass. It is formed to correspond to the opening degree of switching of the valves 19 and 19a. As a result, the left and right hydraulic oil pressure differences formed in the first and second center bypass passages 20 and 22 are not generated.

이로 인해, 붐 등의 고부하 상태인 작업장치에 발생되는 고압력이 통로(23)에 형성되는 경우에도 가변 오리피스(25)에 의해 합류통로(29)가 거의 차단된 상태이므로 작업장치의 고압력이 장비의 주행에 거의 영향을 미치지 않는다.Therefore, even when the high pressure generated in the work device in a high load state such as a boom is formed in the passage 23, the joining passage 29 is almost blocked by the variable orifice 25, so that the high pressure of the work device is increased. It hardly affects driving.

한편, 가변 오리피스(25)가 중립시에는 설정된 오리피스 단면적이 확보되므로 압력손실이 발생되지 않는다. 이로 인해 작업장치에 고부하가 발생되는 경우 통로(23)에 형성되는 작동유를 제2주행 제어밸브(14)에 응원회로로 공급할 수 있다.On the other hand, when the variable orifice 25 is neutral, no pressure loss occurs because the set orifice cross-sectional area is secured. Therefore, when a high load is generated in the work device, the hydraulic oil formed in the passage 23 may be supplied to the second driving control valve 14 as the rooting circuit.

따라서, 중장비의 주행과 작업장치를 동시에 조작하여 복합작업을 하는 경우에도 중장비의 편주행 또는 급주행이 발생되지않아 안정적인 주행으로 조작성이 향상된다.Therefore, even when the operation of the heavy equipment and the work device is operated at the same time to perform a complex operation, the uneven running or rapid running of the heavy equipment does not occur, the operability is improved to a stable running.

이상에서와 같이, 본 발명에 의한 주행직진용 유압회로는 아래와 같은 이점을 갖는다.As described above, the traveling straight hydraulic circuit according to the present invention has the following advantages.

주행용 제어밸브의 풀 스트로크가 아닌 미세한 조작과 붐, 버킷과 같은 작업장치의 미세한 조작이 동시에 요구되는 복합작업을 하는 경우, 작업장치와 독립적인 주행이 가능하여 장비의 급격한 편주행 또는 급주행을 방지하여 주행 조작성을 향상시키고, 또한 작업 능률을 향상시킬 수 있다.In the case of complex work that requires fine control and fine control of work tools such as booms and buckets, rather than full stroke of the driving control valve, it is possible to travel independently of the work equipment, so that the machine can undergo rapid driving or rapid driving. It can prevent and improve driving | operation operability, and can also improve work efficiency.

Claims (4)

삭제delete 제1,2유압펌프(1,2);First and second hydraulic pumps 1 and 2; 상기 제1유압펌프(1)의 제1센터바이패스통로(20)에 설치되는 제1주행 제어밸브(9) 및 작업장치용 제어밸브(10-13);A first travel control valve 9 and a work valve control valve 10-13 installed in the first center bypass passage 20 of the first hydraulic pump 1; 상기 제1센터바이패스통로(20)의 최하류측에 설치되고, 외부로부터 신호압 인가시 절환되는 제1센터바이패스 절환밸브(19);A first center bypass switching valve 19 installed at the most downstream side of the first center bypass passage 20 and switched when an external signal pressure is applied; 상기 제2유압펌프(2)의 제2센터바이패스통로(22)에 설치되는 제2주행 제어밸브(14) 및 작업장치용 제어밸브(15-17);A second driving control valve 14 and a work valve control valve 15-17 installed in the second center bypass passage 22 of the second hydraulic pump 2; 상기 제2센터바이패스통로(22)의 상류측에 설치되고, 외부로부터 신호압 인가시 절환되어 제1,2유압펌프(1,2)로부터 토출되는 작동유를 주행과 작업장치에 분배공급하는 주행직진밸브(4);Traveling which is provided upstream of the second center bypass passage 22 and which is switched at the time of application of signal pressure from the outside and discharged from the first and second hydraulic pumps 1 and 2 to the traveling device and the work device. Straight valve (4); 상기 제2센터바이패스통로(22) 최하류측에 설치되고, 외부로부터 신호압 인가시 절환되는 제2센터바이패스 절환밸브(19a); 및A second center bypass switching valve (19a) installed at the most downstream side of the second center bypass passage (22) and switched when an external signal pressure is applied; And 운전자에 의한 레버 조작시 파일럿 펌프(3)로부터 토출되는 파일럿 신호압을 제1,2센터바이패스 절환밸브(19,19a) 및 주행직진밸브(4)에 공급하여 절환시키는 리모트컨트롤밸브를 구비하여,A remote control valve is provided for supplying and switching the pilot signal pressure discharged from the pilot pump 3 to the first and second center bypass switching valves 19 and 19a and the traveling straight valve 4 when the driver operates the lever. , 장비의 주행과 작업장치를 동시에 구동하여 복합작업하는 경우, 주행직진밸브(4)를 절환시키는 신호압에 의해 제1,2센터바이패스 절환밸브(19,19a)를 절환시켜 제1,2센터바이패스통로(20,22)의 개도를 줄여 작업장치와 주행을 독립적으로 구동할 수 있는 것을 특징으로 하는 주행직진용 유압회로.In the case of complex work by driving the equipment and the work equipment simultaneously, the first and second center bypass switching valves 19 and 19a are switched by the signal pressure to switch the traveling straight valve 4 to the first and second center. The hydraulic circuit for driving straight, characterized in that to reduce the opening degree of the bypass passage (20, 22) to drive the work device and the driving independently. 삭제delete 제1,2유압펌프(1,2);First and second hydraulic pumps 1 and 2; 상기 제1유압펌프(1)의 제1센터바이패스통로(20)에 설치되는 제1주행 제어밸브(9) 및 작업장치용 제어밸브(10-13);A first travel control valve 9 and a work valve control valve 10-13 installed in the first center bypass passage 20 of the first hydraulic pump 1; 상기 제1센터바이패스통로(20) 최하류측에 설치되고, 외부로부터 신호압 인가시 절환되는 제1센터바이패스 절환밸브(19);A first center bypass switching valve 19 installed at the most downstream side of the first center bypass passage 20 and switched when an external signal pressure is applied; 상기 제2유압펌프(2)의 제2센터바이패스통로(22)에 설치되는 제2주행 제어밸브(14) 및 작업장치용 제어밸브(15-17);A second driving control valve 14 and a work valve control valve 15-17 installed in the second center bypass passage 22 of the second hydraulic pump 2; 상기 제2센터바이패스통로(22) 상류측에 설치되고, 외부로부터 신호압 인가시 절환되어 제1,2유압펌프(1,2)로 부터 토출되는 작동유를 주행과 작업장치에 분배공급하는 주행직진밸브(4);Traveling which is installed upstream of the second center bypass passage 22 and which is switched when the signal pressure is applied from the outside and discharged from the first and second hydraulic pumps 1 and 2 to the traveling device and the work device. Straight valve (4); 상기 제2센터바이패스통로(22)의 상류측에서 분기된 통로와 제2센터바이패스통로(22)를 병렬연결한 합류통로(29)에 설치되고, 외부로부터 신호압 인가시 절환되어 작업장치에서 주행측으로 작동유 이동을 차단하는 가변 오리피스(25);It is installed in the confluence passage 29 in which the passage branched from the upstream side of the second center bypass passage 22 and the second center bypass passage 22 are connected in parallel, and is switched when the signal pressure is applied from the outside. Variable orifice 25 to block the movement of the hydraulic fluid to the running side in the; 상기 제2센터바이패스통로(22) 최하류측에 설치되고, 외부로 부터 신호압 인가시 절환되는 제2센터바이패스 절환밸브(19a); 및A second center bypass switching valve (19a) installed at the most downstream side of the second center bypass passage (22) and switched when the signal pressure is applied from the outside; And 운전자에 의한 레버 조작시 파일럿 펌프(3)로 부터 토출되는 파일럿 신호압을 제1,2센터바이패스 절환밸브(19,19a), 주행직진밸브(4) 및 가변 오리피스(25)에 공급하여 절환시키는 리모트컨트롤밸브를 구비하여,The pilot signal pressure discharged from the pilot pump 3 during the lever operation by the driver is supplied to the first and second center bypass switching valves 19 and 19a, the traveling straight valve 4 and the variable orifice 25 to be switched. Equipped with a remote control valve 장비의 주행과 작업장치를 동시에 구동하여 복합작업하는 경우, 주행직진밸브(4)를 절환시키는 신호압에 의해 가변 오리피스(25) 및 제1,2센터바이패스 절환밸브(19,19a)를 절환시켜 제1,2센터바이패스통로(20,22)의 개도를 줄여 작업장치와 주행을 독립적으로 구동할 수 있는 것을 특징으로 하는 주행직진용 유압회로.In the case of complex work by driving the machine and the work device simultaneously, the variable orifice 25 and the first and second center bypass switching valves 19 and 19a are switched by the signal pressure for switching the traveling straight valve 4. By reducing the opening degree of the first and second center bypass passages (20, 22), the working device and the driving linear hydraulic circuit, characterized in that it can drive independently.
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KR1020060034747A KR100753986B1 (en) 2006-04-18 2006-04-18 Hydraulic circuit for traveling priority
US11/732,438 US7614225B2 (en) 2006-04-18 2007-04-03 Straight traveling hydraulic circuit
JP2007101288A JP5053689B2 (en) 2006-04-18 2007-04-09 Straight running hydraulic circuit
EP07007322A EP1847654A3 (en) 2006-04-18 2007-04-10 Straight traveling hydraulic circuit
CN2007100970949A CN101059138B (en) 2006-04-18 2007-04-17 Hydraulic circuit for traveling priority

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