KR100886475B1 - Hydraulic join circuit of construction machine - Google Patents

Hydraulic join circuit of construction machine Download PDF

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KR100886475B1
KR100886475B1 KR1020070024029A KR20070024029A KR100886475B1 KR 100886475 B1 KR100886475 B1 KR 100886475B1 KR 1020070024029 A KR1020070024029 A KR 1020070024029A KR 20070024029 A KR20070024029 A KR 20070024029A KR 100886475 B1 KR100886475 B1 KR 100886475B1
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South Korea
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hydraulic
switching
switching valve
signal line
signal
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KR1020070024029A
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Korean (ko)
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KR20080083450A (en
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구본석
강민혁
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볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2292—Systems with two or more pumps
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • 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
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve

Abstract

굴삭기 등의 작업장치를 구동시키도록 복수개의 유압펌프가 사용되는 유압시스템의 경우, 절환시 유압펌프의 작동유를 합류시켜 작업장치에 공급하는 합류 절환밸브의 작동성을 확보할 수 있도록 한 것으로,In the case of a hydraulic system in which a plurality of hydraulic pumps are used to drive a work device such as an excavator, the hydraulic oil of the hydraulic pump is joined during switching to ensure the operability of the joining switching valve supplied to the work device.

본 발명의 일 실시예에 의한 건설기계용 유압 합류회로는, 제1,2,3유압펌프와,Hydraulic joining circuit for a construction machine according to an embodiment of the present invention, the first, second, third hydraulic pump,

제1유압펌프의 유로에 설치되고, 절환시 작업장치에 공급되는 작동유를 각각 제어하는 밸브들로 이루어진 제1절환밸브와,A first switching valve installed in a flow path of the first hydraulic pump, the first switching valve including valves for controlling hydraulic oil supplied to a working device at the time of switching;

제2유압펌프의 유로에 설치되고, 절환시 작업장치에 공급되는 작동유를 각각 제어하는 밸브들로 이루어진 제2절환밸브와,A second switching valve which is installed in a flow path of the second hydraulic pump and includes valves for controlling hydraulic oil supplied to a working device at the time of switching;

제3유압펌프의 유로에 설치되고, 절환시 작업장치에 공급되는 작동유를 각각 제어하는 밸브들로 이루어진 제3절환밸브와,A third switching valve installed in a flow path of the third hydraulic pump and having valves for controlling hydraulic oil supplied to a working device at the time of switching;

제1,2유압펌프의 유로 상류측에 각각 설치되고, 절환시 좌측 및 우측 주행장치에 공급되는 작동유를 각각 제어하는 밸브들로 이루어진 제4절환밸브와,A fourth switching valve which is provided on the upstream side of the flow path of the first and second hydraulic pumps, respectively, and comprises valves for controlling hydraulic oil supplied to the left and right traveling devices, respectively;

제3유압펌프의 유로 하류측에 설치되고, 신호통로에 신호압 공급으로 절환시 제3유압펌프의 작동유를 제1유압펌프측 작업장치 또는 제2유압펌프측 작업장치에 선택적으로 공급하는 합류 절환밸브와,It is installed on the downstream side of the flow path of the third hydraulic pump and, when switching to the signal pressure supply to the signal passage, the converse switching to selectively supply the hydraulic oil of the third hydraulic pump to the first hydraulic pump side working device or the second hydraulic pump side working device. With the valve,

합류 절환밸브 신호통로에 접속되고, 주행장치용 제4절환밸브를 절환시 신호압력이 형성되는 주행장치용 신호라인과,A signal line for the traveling device connected to the confluence switching valve signal path, wherein a signal pressure is formed when the fourth switching valve for traveling device is switched;

합류 절환밸브 신호통로 및 주행장치용 신호라인에 입구측이 분기접속되고, 제1,2유압펌프에 각각 연결된 작업장치용 제1,2절환밸브를 절환시 신호압력이 형성되는 작업장치용 신호라인을 포함한다.The signal line for the work device in which the inlet side is branched to the confluence switching valve signal path and the traveling device signal line, and the signal pressure is formed when the first and second switch valves for the work device are respectively connected to the first and second hydraulic pumps. It includes.

건설기계, 유압 합류회로, 합류 절환밸브 Construction machinery, hydraulic joining circuit, joining switching valve

Description

건설기계용 유압 합류회로{hydraulic join circuit of construction machine}Hydraulic join circuit of construction machine

도 1은 종래 기술에 의한 합류 기능을 갖는 유압회로도,1 is a hydraulic circuit diagram having a joining function according to the prior art;

도 2는 본 발명의 일 실시예에 의한 건설기계용 유압 합류회로도,2 is a hydraulic confluence circuit diagram for a construction machine according to an embodiment of the present invention;

도 3은 본 발명의 다른 실시예에 의한 건설기계용 유압 합류회로도이다.3 is a hydraulic confluence circuit diagram for a construction machine 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

11; 제1교축부11; 1st throttle

12; 제2교축부12; Second Bridge

13,23; 주행장치용 신호라인13,23; Signal line for traveling device

14,24; 작업장치용 신호라인14,24; Signal line for work equipment

15,25; 합류 절환밸브 신호통로15,25; Joining switch valve signal path

16,26; 체크밸브16,26; Check valve

17,27; 유압탱크17,27; Hydraulic tank

A; 제1절환밸브A; First switching valve

B; 제2절환밸브B; Second switching valve

C; 제3절환밸브C; Section 3 switching valve

D; 제4절환밸브D; Section 4 switching valve

E; 합류 절환밸브E; Confluence switching valve

본 발명은 신호압 공급으로 절환시 유압펌프로부터의 작동유를 합류시켜 작업장치에 공급하는 합류 절환밸브를 포함하는 건설기계용 유압 합류회로에 관한 것이다.The present invention relates to a hydraulic joining circuit for a construction machine including a joining switching valve for joining the hydraulic oil from the hydraulic pump when switching to the signal pressure supply to supply to the working device.

더욱 상세하게는, 굴삭기 등의 작업장치를 구동시키도록 복수개의 유압펌프가 사용되는 유압시스템의 경우, 절환시 유압펌프의 작동유를 합류시켜 작업장치에 공급하는 합류 절환밸브의 작동성을 확보할 수 있도록 한 건설기계용 유압 합류회로에 관한 것이다.More specifically, in the case of a hydraulic system in which a plurality of hydraulic pumps are used to drive a work device such as an excavator, it is possible to secure the operability of the confluence switching valve supplied to the work device by joining the hydraulic oil of the hydraulic pump during the changeover. To a hydraulic confluence circuit for a construction machine.

이하, 첨부된 도면에서 유압펌프의 작동유를 합류시키는 합류 기능과 관련되는 파일럿 신호라인의 구성에 대해서만 표기하였으며, 해당 절환밸브들이 절환되는 경우 파일럿 신호라인이 차단된다. 이때 절환상태를 별도로 표기하지 않았으며, 해당 절환밸브를 절환시 유압펌프와 작업장치사이의 유로를 표기하지 않았다.Hereinafter, only the configuration of the pilot signal line associated with the joining function for joining the hydraulic oil of the hydraulic pump in the accompanying drawings, the pilot signal line is blocked when the corresponding switching valve is switched. At this time, the switching state was not separately indicated, and the flow path between the hydraulic pump and the work device was not indicated when the corresponding switching valve was switched.

도 1에 도시된 바와 같이, 종래 기술에 의한 합류 기능을 갖는 유압회로는, 제1,2,3유압펌프(P1,P2,P3)와,As shown in Figure 1, the hydraulic circuit having a joining function according to the prior art, the first, second, third hydraulic pump (P1, P2, P3),

제1유압펌프(P1)의 유로에 설치되고, 절환시 아암, 붐, 버킷 등의 작업장치에 공급되는 작동유를 각각 제어하는 밸브들로 이루어진 제1절환밸브(A)와,A first switching valve A installed in a flow path of the first hydraulic pump P1 and having valves for controlling hydraulic oil supplied to a work device such as an arm, a boom, and a bucket during switching;

제2유압펌프(P2)의 유로에 설치되고, 절환시 아암, 붐, 옵션장치 등의 작업장치에 공급되는 작동유를 각각 제어하는 밸브들로 이루어진 제2절환밸브(B)와,A second switching valve (B) installed in a flow path of the second hydraulic pump (P2) and having valves for controlling hydraulic oil supplied to a working device such as an arm, a boom, and an optional device at the time of switching;

제3유압펌프(P3)의 유로에 설치되고, 절환시 선회장치 등에 공급되는 작동유를 각각 제어하는 밸브들로 이루어진 제3절환밸브(C)와,A third switching valve C installed in a flow path of the third hydraulic pump P3 and having valves for controlling hydraulic oil supplied to a swinging device and the like, when switching;

제1,2유압펌프(P1,P2)의 유로 상류측에 설치되고, 절환시 좌측 및 우측 주행장치에 공급되는 작동유를 각각 제어하는 밸브들로 이루어진 제4절환밸브(D)와,A fourth switching valve (D) installed at an upstream side of the flow paths of the first and second hydraulic pumps (P1, P2), and having valves for controlling hydraulic fluid supplied to the left and right traveling devices, respectively, when switching;

제3유압펌프(P3)의 유로 하류측에 설치되고, 파일럿 신호압(Pi1) 공급으로 절환시 제3유압펌프(P3)의 작동유를 제1유압펌프(P1)측 작업장치 또는 제2유압펌프(P2)측 작업장치에 선택적으로 공급하는 합류 절환밸브(E)를 포함한다.It is installed on the downstream side of the flow path of the third hydraulic pump P3, and when switching to supply the pilot signal pressure Pi1, the working oil of the third hydraulic pump P3 is either the first hydraulic pump P1 working device or the second hydraulic pump. And a joining switching valve (E) for selectively supplying the (P2) side work equipment.

일반적인 소형 굴삭기에서는, 주행시 제1유압펌프(P1)로 부터 토출되는 작동유는 우측 주행모터에 공급되어 구동시키고, 제2유압펌프(P2)로 부터 토출되는 작동유는 좌측 주행모터에 공급되어 구동시킨다. 이때 아암(arm) 붐(boom) 버킷(bucket) 등의 다른 작업장치를 구동시킬 경우 제3유압펌프(P3)로 부터 토출되는 작동유를 사용하기 위하여 합류 절환밸브(E)를 사용한다.In a general compact excavator, the hydraulic oil discharged from the first hydraulic pump P1 during driving is supplied to the right driving motor and driven, and the hydraulic oil discharged from the second hydraulic pump P2 is supplied and driven to the left driving motor. In this case, when driving other work devices such as an arm boom bucket, a confluence switching valve E is used to use the hydraulic fluid discharged from the third hydraulic pump P3.

전술한 합류 절환밸브(E)는 파일럿 펌프(미도시됨)로부터의 파일럿 신호 압(Pi1) 공급으로 절환되고, 절환시 제3유압펌프(P3)로부터의 작동유를 제1유압펌프(P1)측 작업장치(아암, 붐, 버킷 등을 말함) 또는 제2유압펌프(P2)측 작업장치(아암, 붐, 옵션장치 등을 말함)에 합류시킨다.The above-mentioned confluence switching valve E is switched to supply pilot signal pressure Pi1 from a pilot pump (not shown), and at the time of switching, hydraulic oil from the third hydraulic pump P3 is supplied to the first hydraulic pump P1 side. Join the work device (refer to arm, boom, bucket, etc.) or the work device (refer to arm, boom, option device, etc.) on the second hydraulic pump (P2) side.

전술한 합류 절환밸브(E)를 절환시키도록 신호압력을 형성하는 신호라인(3)은, 제1교축부(1)를 통과하여 밸브(6)의 상단측에 접속되며, 주행장치용 절환밸브(D)를 경유하여 유압탱크(7)에 연결된다.The signal line 3 which forms the signal pressure to switch the above-mentioned joining switching valve E is connected to the upper end side of the valve 6 through the 1st throttle part 1, and is a switching valve for traveling devices. It is connected to the hydraulic tank 7 via (D).

또한, 합류 절환밸브(E)를 절환시키도록 신호압력을 형성하는 신호라인(4)은, 제2교축부(2)를 통과하여 합류 절환밸브 신호통로(5)에 접속되고, 밸브(6)의 하단측에 접속되며, 제1,2유압펌프(P1,P2)의 작업장치용 절환밸브(A,B)를 경유하여 유압탱크(8)에 연결된다.In addition, the signal line 4 which forms the signal pressure to switch the joining switching valve E is connected to the joining switching valve signal passage 5 through the second throttle 2 and is connected to the valve 6. It is connected to the lower end side of, and is connected to the hydraulic tank (8) via the switching valves (A, B) for the working device of the first and second hydraulic pumps (P1, P2).

따라서, 주행장치용 제4절환밸브(D)를 절환시키는 경우, 제1교축부(1)에 의해 신호라인(3)에 신호압력이 형성되므로 밸브(6)는 도면상 우측방향으로 시프팅된다. 이때 제1,2유압펌프(P1,P2)의 유로에 연결되는 작업장치용 제1,2절환밸브(A,B)를 절환시키는 않을 경우 신호라인(4)에 신호압력이 형성되지 않는다.Accordingly, when the fourth switching valve D for traveling device is switched, the signal pressure is formed in the signal line 3 by the first throttle 1 so that the valve 6 is shifted to the right in the drawing. . At this time, if the first and second switching valves A and B for the work device connected to the flow paths of the first and second hydraulic pumps P1 and P2 are not switched, the signal pressure is not formed in the signal line 4.

이로 인해, 합류 절환밸브 신호통로(5)에 신호압력이 형성되지 않아 합류 절환밸브(E)는 절환되지 않는다.For this reason, no signal pressure is formed in the joining switch valve signal passage 5, and the joining switch valve E is not switched.

한편, 제1,2유압펌프(P1,P2)의 유로에 설치되는 작업장치용 제1,2절환밸브(A,B)를 절환시키는 경우(작업장치용 제1,2절환밸브(A,B)와 주행장치용 제4절환 밸브(D)를 동시에 절환시키는 경우), 신호라인(4) 및 합류 절환밸브 신호통로(5)에 신호압력이 각각 형성된다.On the other hand, in the case of switching the first and second switching valves A and B for working apparatuses installed in the flow paths of the first and second hydraulic pumps P1 and P2 (first and second switching valves A and B for working apparatuses). ) And the fourth switching valve (D) for traveling device at the same time), the signal pressure is formed in the signal line (4) and the confluence switching valve signal passage (5), respectively.

즉, 합류 절환밸브(E)가 합류 절환밸브 신호통로(5)에 형성되는 신호압력에 의해 절환됨에 따라, 제3유압펌프(P3)로부터의 작동유는 제1유압펌프(P1)측 작업장치(아암, 버킷, 붐) 또는 제2유압펌프(P2)측 작업장치(아암, 붐, 옵션장치)에 공급되어 합류된다.That is, as the joining switching valve E is switched by the signal pressure formed in the joining switching valve signal passage 5, the working oil from the third hydraulic pump P3 is transferred to the first hydraulic pump P1 working device ( It is supplied to an arm, a bucket, a boom or a work device (arm, a boom, an optional device) on the side of the second hydraulic pump P2 and joined.

전술한 합류 절환밸브 신호통로(5)에 형성되는 신호압력(Pi1)에 의해 합류 절환밸브(E)를 절환시켜 제3유압펌프(P3)로부터의 작동유를 합류시키는 유압 합류회로에 있어서, 밸브(6)에 고장이 발생되는 경우, 즉 밸브 시트에 마모가 발생되거거나, 또는 이물질이 유입됨에 따라 밸브(6)의 작동이 정상적으로 이루어지지 않는다.In the hydraulic confluence circuit for joining the hydraulic oil from the third hydraulic pump P3 by switching the confluence switching valve E by the signal pressure Pi1 formed in the confluence switching valve signal passage 5 described above, the valve ( In the event of a failure in 6), i.e. wear on the valve seat, or foreign matter inflow, the operation of the valve 6 is not normally performed.

이로 인해, 신호라인(4)의 작동유가 밸브(6)를 통하여 유압탱크(9)로 배출될 경우, 합류 절환밸브(E)를 절환시키는 신호압력이 합류 절환밸브 신호통로(5)에 형성되지 않는다. 합류 절환밸브(E)에 의한 합류 기능이 원활하게 수행되지 못해 작업성 및 신뢰성이 떨어지는 문제점을 갖는다.Therefore, when the hydraulic oil of the signal line 4 is discharged to the hydraulic tank 9 through the valve 6, the signal pressure for switching the joining switch valve E is not formed in the joining switch valve signal passage 5. Do not. The joining function by the joining switching valve (E) is not smoothly performed and has a problem in that workability and reliability are inferior.

본 발명의 실시예는, 신호압 공급으로 절환시 유압펌프의 작동유를 작업장치에 합류시키는 합류 절환밸브의 불완전 작동 요인을 제거하여 작동성을 확보할 수 있도록 한 건설기계용 유압 합류회로와 관련된다.An embodiment of the present invention relates to a hydraulic joining circuit for a construction machine, which makes it possible to secure operability by eliminating an incomplete operating factor of a joining switching valve for joining hydraulic oil of a hydraulic pump to a work device when switching to a signal pressure supply. .

본 발명의 일 실시예에 의한 건설기계용 유압 합류회로는, 제1,2,3유압펌프와,Hydraulic joining circuit for a construction machine according to an embodiment of the present invention, the first, second, third hydraulic pump,

제1유압펌프의 유로에 설치되고, 절환시 작업장치에 공급되는 작동유를 각각 제어하는 밸브들로 이루어진 제1절환밸브와,A first switching valve installed in a flow path of the first hydraulic pump, the first switching valve including valves for controlling hydraulic oil supplied to a working device at the time of switching;

제2유압펌프의 유로에 설치되고, 절환시 작업장치에 공급되는 작동유를 각각 제어하는 밸브들로 이루어진 제2절환밸브와,A second switching valve which is installed in a flow path of the second hydraulic pump and includes valves for controlling hydraulic oil supplied to a working device at the time of switching;

제3유압펌프의 유로에 설치되고, 절환시 작업장치에 공급되는 작동유를 각각 제어하는 밸브들로 이루어진 제3절환밸브와,A third switching valve installed in a flow path of the third hydraulic pump and having valves for controlling hydraulic oil supplied to a working device at the time of switching;

제1,2유압펌프의 유로 상류측에 각각 설치되고, 절환시 좌측 및 우측 주행장치에 공급되는 작동유를 각각 제어하는 밸브들로 이루어진 제4절환밸브와,A fourth switching valve which is provided on the upstream side of the flow path of the first and second hydraulic pumps, respectively, and comprises valves for controlling hydraulic oil supplied to the left and right traveling devices, respectively;

제3유압펌프의 유로 하류측에 설치되고, 신호통로에 신호압 공급으로 절환시 제3유압펌프의 작동유를 제1유압펌프측 작업장치 또는 제2유압펌프측 작업장치에 선택적으로 공급하는 합류 절환밸브와,It is installed on the downstream side of the flow path of the third hydraulic pump and, when switching to the signal pressure supply to the signal passage, the converse switching to selectively supply the hydraulic oil of the third hydraulic pump to the first hydraulic pump side working device or the second hydraulic pump side working device. With the valve,

합류 절환밸브 신호통로에 접속되고, 주행장치용 제4절환밸브를 절환시 신호압력이 형성되는 주행장치용 신호라인과,A signal line for the traveling device connected to the confluence switching valve signal path, wherein a signal pressure is formed when the fourth switching valve for traveling device is switched;

합류 절환밸브 신호통로 및 주행장치용 신호라인에 입구측이 분기접속되고, 제1,2유압펌프에 각각 연결된 작업장치용 제1,2절환밸브를 절환시 신호압력이 형성 되는 작업장치용 신호라인을 포함한다.The signal line for the work device in which the inlet side is branched to the confluence switching valve signal path and the traveling device signal line, and the signal pressure is formed when the first and second switch valves for the work device connected to the first and second hydraulic pumps are switched. It includes.

전술한 주행장치용 신호라인과 작업장치용 신호라인을 연결하는 유로에 설치되고 일방향으로 작동유의 흐름을 허용하는 체크밸브를 더 포함한다.The apparatus further includes a check valve installed in a flow path connecting the signal line for the traveling device and the signal line for the work device to allow the flow of the working oil in one direction.

전술한 체크밸브는, 작업장치용 신호라인에서 주행장치용 신호라인으로 작동유 흐름을 허용하도록 설치된다.The above-described check valve is installed to allow hydraulic oil flow from the signal line for the work device to the signal line for the traveling device.

전술한 체크밸브는, 주행장치용 신호라인에서 작업장치용 신호라인으로 작동유 흐름을 허용하도록 설치된다.The above-described check valve is installed to allow the flow of hydraulic oil from the signal line for the traveling device to the signal line for the working device.

전술한 주행장치용 신호라인에 설치되고, 주행장치용 제4절환밸브 절환시 주행장치용 신호라인에 신호압력을 형성하는 제1교축부와,A first throttle part installed in the signal line for the traveling device and forming a signal pressure in the signal line for the traveling device when the fourth switching valve for traveling device is switched;

합류 절환밸브 신호통로에 설치되고, 작업장치용 제1,2절환밸브를 절환시 작업장치용 신호라인 및 합류 절환밸브 신호통로에 신호압력을 형성하는 제2교축부를 더 포함한다.The second switching unit is installed in the joining switching valve signal passage and forms a signal pressure in the working apparatus signal line and the joining switching valve signal passage when switching the first and second switching valves for the working apparatus.

전술한 작업장치용 신호라인에 설치되고, 작업장치용 제1,2절환밸브를 절환시 작업장치용 신호라인에 신호압력을 형성하는 제3교축부와,A third throttle portion installed in the signal line for the work device described above and for forming a signal pressure in the signal line for the work device when the first and second switching valves for the work device are switched;

합류 절환밸브 신호통로에 설치되고, 주행장치용 제4절환밸브를 절환시 주행장치용 신호라인 및 합류 절환밸브 신호통로에 신호압력을 형성하는 제4교축부를 더 포함한다.And a fourth throttle part installed in the confluence switching valve signal path and configured to form a signal pressure in the signal line for traveling device and the confluence switching valve signal path when the fourth switching valve for traveling device is switched.

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 않는다.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 is not intended that the technical spirit and scope of the present invention be limited.

도 2에 도시된 바와 같이, 본 발명의 일 실시예에 의한 건설기계용 유압 합류회로는, 제1,2,3유압펌프(P1,P2,P3)와,As shown in Figure 2, the hydraulic confluence circuit for construction machinery according to an embodiment of the present invention, the first, second, third hydraulic pumps (P1, P2, P3),

제1유압펌프(P1)의 유로에 설치되고, 절환시 작업장치(아암, 붐, 버킷)에 공급되는 작동유를 각각 제어하는 밸브들로 이루어진 제1절환밸브(A)와,A first switching valve A installed in a flow path of the first hydraulic pump P1 and having valves for controlling hydraulic oil supplied to a work device (arm, boom, bucket) at the time of switching, and

제2유압펌프(P2)의 유로에 설치되고, 절환시 작업장치(아암, 붐, 옵션장치)에 공급되는 작동유를 각각 제어하는 밸브들로 이루어진 제2절환밸브(B)와,A second switching valve B installed in a flow path of the second hydraulic pump P2 and having valves for controlling hydraulic oil supplied to a work device (arm, boom, and optional device) at the time of switching;

제3유압펌프(P3)의 유로에 설치되고, 절환시 작업장치(예를들어 선회장치를 말함)에 공급되는 작동유를 각각 제어하는 밸브들로 이루어진 제3절환밸브(C)와,A third switching valve C, which is installed in a flow path of the third hydraulic pump P3, and which has valves for controlling hydraulic oil supplied to a work device (for example, a turning device) at the time of switching, and

제1,2유압펌프(P1,P2)의 유로 상류측에 각각 설치되고, 절환시 좌측 및 우측 주행장치에 공급되는 작동유를 각각 제어하는 밸브들로 이루어진 제4절환밸브(D)와,Fourth switching valve (D) which is provided on the upstream side of the flow path of the first and second hydraulic pumps (P1, P2), respectively, consisting of valves for controlling the hydraulic fluid supplied to the left and right traveling devices, respectively,

제3유압펌프(P3)의 유로 하류측에 설치되고, 합류 절환밸브 신호통로(15)를 통한 파일럿 신호압(Pi1) 공급으로 절환시 제3유압펌프(P3)의 작동유를 제1유압펌프(P1)측 작업장치, 또는 제2유압펌프(P2)측 작업장치에 선택적으로 공급하는 합류 절환밸브(E)와,It is installed on the downstream side of the flow path of the third hydraulic pump (P3), and when switching to supply the pilot signal pressure (Pi1) through the joining switch valve signal passage 15 to supply the hydraulic oil of the third hydraulic pump (P3) to the first hydraulic pump ( A joining switching valve (E) for selectively supplying the work device on the P1 side or the work device on the second hydraulic pump P2;

합류 절환밸브 신호통로(15)에 접속되고, 주행장치용 제4절환밸브(D)를 절환 시 신호압력이 형성되는 주행장치용 신호라인(13)과,A traveling device signal line 13 connected to the confluence switching valve signal path 15 and in which a signal pressure is formed when the fourth switching valve D for traveling device is switched;

합류 절환밸브 신호통로(15) 및 주행장치용 신호라인(13)에 입구측이 분기접속되고, 제1,2유압펌프(P1,P2)에 각각 연결된 작업장치용 제1,2절환밸브(A,B)를 절환시 신호압력이 형성되는 작업장치용 신호라인(14)을 포함한다.The first and second switching valves A for work devices connected to the joining switching valve signal passage 15 and the traveling signal line 13 and connected to the first and second hydraulic pumps P1 and P2, respectively. And a signal line 14 for the working device in which the signal pressure is formed when the switch B is switched.

도 2에 도시된 바와 같이, 전술한 주행장치용 신호라인(13)과 작업장치용 신호라인(14)을 연결하는 유로에 설치되고 일방향으로 작동유의 흐름을 허용(작업장치용 신호라인(14)에서 주행장치용 신호라인(13)으로 작동유 흐름이 허용됨)하는 체크밸브(16)를 포함한다.As shown in Fig. 2, the above-described traveling device signal line 13 and work device signal line 14 are installed in a flow path connecting the hydraulic fluid in one direction (work device signal line 14). Hydraulic fluid flow is allowed to the signal line 13 for the traveling device).

전술한 주행장치용 신호라인(13)에 설치되고, 주행장치용 제4절환밸브(D)를 절환시 주행장치용 신호라인(13)에 신호압력을 형성하는 제1교축부(11)와,A first throttle portion 11 provided in the above-mentioned traveling device signal line 13 and for forming a signal pressure in the traveling device signal line 13 when the fourth switching valve D for traveling device is switched;

합류 절환밸브 신호통로(15)에 설치되고, 작업장치용 제1,2절환밸브(A,B)를 절환시 작업장치용 신호라인(14) 및 합류 절환밸브 신호통로(15)에 신호압력을 형성하는 제2교축부(12)를 포함한다.It is installed in the joining switching valve signal passage 15, and when switching the first and second switching valves (A, B) for the working device, the signal pressure is applied to the signal line (14) and the joining switching valve signal path (15) for the working device. And a second throttle portion 12 to be formed.

전술한 주행장치용 신호라인(13)은 합류 절환밸브 신호통로(15)에 설치된 제2교축부(12) 상류측에 접속되고, 신호압력은 제1교축부(11)를 통과하여 주행장치용 제4절환밸브(D)를 경유하여 유압탱크(17)에 연결되도록 설치된다.The above-mentioned traveling device signal line 13 is connected to the upstream side of the second throttle part 12 provided in the confluence switching valve signal path 15, and the signal pressure passes through the first throttle part 11 for the traveling device. It is installed to be connected to the hydraulic tank 17 via the fourth switching valve (D).

전술한 작업장치용 신호라인(14)은 합류 절환밸브 신호통로(15)의 제2교축부(12) 하류측과, 주행장치용 신호라인(13)의 제1교축부(11) 하류측에 분기접속된다. 이때 신호압력은 제2유압펌프(P2)와 연결되는 작업장치용 제2절환밸브(B)를 통 과한 후, 신호라인(14)을 따라 제1유압펌프(P1)와 연결되는 작업장치용 제1절환밸브(A)를 경유하도록 설치된다.The above-described working device signal line 14 is disposed downstream of the second throttle part 12 of the joining switching valve signal passage 15 and downstream of the first throttle part 11 of the traveling device signal line 13. Branch connection is made. At this time, the signal pressure passes through the second switching valve (B) for the working device connected to the second hydraulic pump (P2), and then the working device agent connected to the first hydraulic pump (P1) along the signal line (14). It is installed so as to pass through the 1 switching valve (A).

이때, 전술한 제1,2,3유압펌프(P1,P2,P3)와, 제1유압펌프(P1)의 유로에 설치되는 작업장치용 제1절환밸브(A)와, 제2유압펌프(P2)의 유로에 설치되는 작업장치용 제2절환밸브(B)와, 제3유압펌프(P3)의 유로에 설치되는 작업장치용 제3절환밸브(C)와, 제1,2유압펌프(P1,P2)의 유로 상류측에 설치되는 주행장치용 제4절환밸브(D)와, 제3유압펌프(P3)의 유로 하류측에 설치되는 합류 절환밸브(E)는, 도 1에 도시된 것과 실질적으로 동일하게 적용되므로 이들의 설명은 생략하고, 중복되는 도면부호는 동일하게 표기하였다.At this time, the first, second and third hydraulic pumps P1, P2 and P3 described above, the first switching valve A for the work device installed in the flow path of the first hydraulic pump P1, and the second hydraulic pump ( 2nd switching valve (B) for work equipment provided in the flow path of P2), 3rd switching valve (C) for work equipment provided in the flow path of 3rd hydraulic pump (P3), and 1st, 2nd hydraulic pump ( The 4th switching valve D for traveling devices provided in the upstream of the flow path of P1 and P2, and the joining switching valve E provided in the downstream of the flow path of the 3rd hydraulic pump P3 are shown in FIG. Since they are applied in substantially the same manner, the description thereof is omitted, and overlapping reference numerals are the same.

이하에서, 본 발명의 일 실시예에 의한 건설기계용 유압 합류회로의 사용예를 첨부된 도면을 참조하여 설명한다.Hereinafter, with reference to the accompanying drawings an example of the use of the hydraulic confluence circuit for construction machinery according to an embodiment of the present invention.

도 2에 도시된 바와 같이, 주행하기 위하여 제1,2유압펌프(P1,P2)의 유로에 설치되는 주행장치용 제4절환밸브(D)를 절환시키는 경우 주행장치용 신호라인(13)에 신호압력이 형성된다. 이때 제1유압펌프(P1)에 연결되는 제1절환밸브(A) 또는 제2유압펌프(P2)에 연결되는 제2절환밸브(B)를 절환시키지않는 경우 작업장치용 신호라인(14)에 신호압력이 형성되지않는다.As shown in FIG. 2, in the case of switching the fourth switching valve D for the traveling device installed in the flow paths of the first and second hydraulic pumps P1 and P2, the traveling device signal line 13 Signal pressure is formed. In this case, when the first switching valve A connected to the first hydraulic pump P1 or the second switching valve B connected to the second hydraulic pump P2 is not switched, the signal line 14 for the work device is Signal pressure is not established.

이로 인해, 신호라인(14)과 접속되는 합류 절환밸브 신호통로(15)에도 신호 압력이 형성되지않아 합류 절환밸브(E)는 절환되지 않는다.For this reason, no signal pressure is formed in the joining switch valve signal passage 15 connected to the signal line 14, and the joining switch valve E is not switched.

한편, 제1유압펌프(P1)측 제1절환밸브(A) 또는 제2유압펌프(P2)측 제2절환밸브(B)를 절환시키는 경우(주행장치용 제4절환밸브(D)와 작업장치용 제1,2절환밸브(A,B)를 동시에 절환시키는 경우), 제2교축부(12)에 의해 신호라인(14)에 신호압력이 형성된다. 따라서 신호라인(14)과 접속되는 합류 절환밸브 신호통로(15)에 형성되는 신호압력에 의해 합류 절환밸브(E)는 절환된다.On the other hand, when switching the 1st switching valve A of the 1st hydraulic pump P1 side, or the 2nd switching valve B side of the 2nd hydraulic pump P2 (working with the 4th switching valve D for traveling devices) When the first and second switching valves A and B for the device are simultaneously switched), the signal pressure is formed in the signal line 14 by the second throttle 12. Therefore, the joining switching valve E is switched by the signal pressure formed in the joining switching valve signal passage 15 connected to the signal line 14.

이로 인해, 제3유압펌프(P3)로부터의 작동유는 제1유압펌프(P1)측의 작업장치(아암, 붐, 버킷), 또는 제2유압펌프(P2)측의 작업장치(아암, 붐, 옵션장치)를 구동시키도록 공급된다.For this reason, the hydraulic fluid from the 3rd hydraulic pump P3 carries out the working apparatus (arm, boom, bucket) of the 1st hydraulic pump P1 side, or the working apparatus (arm, boom, etc.) of the 2nd hydraulic pump P2 side. Is supplied to drive an optional device).

전술한 체크밸브(16)가 파손되거나 또는 고장으로 인해 신호라인(13)에 형성되는 신호압력이 체크밸브(16)를 경유하여 신호라인(14)에 역류되는 경우에도, 작업장치를 절환시킬 경우 절환되는 작업장치용 제1,2절환밸브(A,B)와 제2교축부(12)에 의해 신호라인(14)은 폐쇄된다.When the work device is switched even when the signal pressure formed in the signal line 13 due to breakage or failure of the aforementioned check valve 16 flows back to the signal line 14 via the check valve 16. The signal line 14 is closed by the first and second switching valves A and B and the second throttle 12 for the work device to be switched.

따라서, 신호라인(14)에 접속되는 합류 절환밸브 신호통로(15)에 형성되는 신호압력에 의해 절환되는 합류 절환밸브(E)의 작동성이 확보된다.Therefore, the operability of the joining switch valve E switched by the signal pressure formed in the joining switch valve signal passage 15 connected to the signal line 14 is ensured.

도 3에 도시된 바와 같이, 본 발명의 다른 실시예에 의한 건설기계용 유압 합류회로는, 합류 절환밸브 신호통로(25)에 접속되고, 좌측 및 우측 주행장치용 제 4절환밸브(D)를 절환시 신호압력이 형성되는 주행장치용 신호라인(23)과,As shown in FIG. 3, the hydraulic joining circuit for a construction machine according to another embodiment of the present invention is connected to the joining switch valve signal path 25 and connects the fourth switching valve D for the left and right traveling devices. A signal line 23 for a traveling device in which a signal pressure is formed during switching;

합류 절환밸브 신호통로(25) 및 주행장치용 신호라인(23)에 입구측이 분기접속되고, 제1,2유압펌프(P1,P2)에 각각 연결된 작업장치용 제1,2절환밸브(A,B)를 절환시 신호압력이 형성되는 작업장치용 신호라인(24)과,The inlet side is branch-connected to the confluence switching valve signal path 25 and the traveling signal line 23, and the first and second switching valves A for the work device connected to the first and second hydraulic pumps P1 and P2, respectively. A signal line 24 for the work device, in which a signal pressure is formed when switching B and B);

작업장치용 신호라인(24)에 설치되고, 작업장치용 제1,2절환밸브(A,B)를 절환시 작업장치용 신호라인(24)에 신호압력을 형성하는 제3교축부(21)와,The third throttle portion 21 is installed in the signal line 24 for the work device and forms a signal pressure in the signal line 24 for the work device when the first and second switching valves A and B for the work device are switched. Wow,

합류 절환밸브 신호통로(25)에 설치되고, 주행장치용 제4절환밸브(D)를 절환시 주행장치용 신호라인 및 합류 절환밸브 신호통로(25)에 신호압력을 형성하는 제4교축부(22)와,A fourth throttle part installed in the confluence switching valve signal passage 25 to form a signal pressure in the traveling signal line and the confluence switching valve signal passage 25 when the fourth switching valve D for traveling device is switched; 22) and,

주행장치용 신호라인(23)과 작업장치용 신호라인(24)을 분기접속하는 유로에 설치되고, 주행장치용 신호라인(23)에서 작업장치용 신호라인(24)으로 작동유 흐름이 허용되는 체크밸브(26)를 제외한 구성은, 본 발명의 일 실시예에 도시된 것과 실질적으로 동일하게 적용되므로 이들의 상세한 설명은 생략하고, 중복되는 도면부호는 동일하게 표기한다.A check is provided in the flow path for branching the signal line 23 for the traveling device and the signal line 24 for the working device, and the flow of hydraulic fluid is allowed from the signal line 23 for the traveling device to the signal line 24 for the working device. The configuration except for the valve 26 is applied substantially the same as that shown in one embodiment of the present invention, so detailed description thereof will be omitted, and overlapping reference numerals will be denoted the same.

따라서, 본 발명의 다른 실시예에 의한 건설기계용 유압 합류회로는, 주행하기 위하여 제1,2유압펌프(P1,P2)의 유로에 설치되는 주행장치용 제4절환밸브(D)를 절환시키는 경우 주행장치용 신호라인(23)에 신호압력이 형성된다.Therefore, the hydraulic joining circuit for construction machinery according to another embodiment of the present invention switches the fourth switching valve D for the traveling device installed in the flow paths of the first and second hydraulic pumps P1 and P2 to travel. In this case, a signal pressure is formed in the signal line 23 for the traveling device.

이때, 제1유압펌프(P1)에 연결되는 제1절환밸브(A) 또는 제2유압펌프(P2)에 연결되는 제2절환밸브(B)를 절환시키지않는 경우 주행장치용 신호라인(23)에 신호 압력이 형성되지 않는다. 이로 인해 신호라인(23)과 접속되는 합류 절환밸브 신호통로(25)에도 신호압력이 형성되지않아 합류 절환밸브(E)는 절환되지 않는다.At this time, when the first switching valve (A) connected to the first hydraulic pump (P1) or the second switching valve (B) connected to the second hydraulic pump (P2) is not switched, the signal line 23 for the traveling device. No signal pressure is formed. As a result, no signal pressure is formed in the joining switch valve signal passage 25 connected to the signal line 23, so that the joining switch valve E is not switched.

한편, 주행장치용 제4절환밸브(D)와 작업장치용 제1,2절환밸브(A,B)를 동시에 절환시키는 경우 신호라인(23)에 신호압력이 형성된다. 따라서 신호라인(23)과 접속되는 합류 절환밸브 신호통로(25)에 형성되는 신호압력에 의해 합류 절환밸브(E)는 절환된다.On the other hand, when the fourth switching valve (D) for the traveling device and the first and second switching valves (A, B) for the working device are simultaneously switched, a signal pressure is formed in the signal line (23). Therefore, the joining switching valve E is switched by the signal pressure formed in the joining switching valve signal passage 25 connected to the signal line 23.

이때, 체크밸브(26)가 파손되거나 또는 고장으로 인해 신호라인(24)에 형성되는 신호압력이 체크밸브(26)를 경유하여 신호라인(23)에 역류되는 경우, 주행장치를 작동할 경우 절환되는 주행장치용 제4절환밸브(D)와 제2교축부(22)에 의해 신호라인(23)은 폐쇄된다.At this time, when the check valve 26 is damaged or malfunctions, the signal pressure formed in the signal line 24 flows back to the signal line 23 via the check valve 26, and is switched when the traveling device is operated. The signal line 23 is closed by the fourth switching valve D and the second throttle 22 for the traveling device.

따라서, 신호라인(23)에 접속되는 합류 절환밸브 신호통로(25)에 형성되는 신호압력에 의해 절환되는 합류 절환밸브(E)의 작동성이 확보된다.Therefore, the operability of the joining switch valve E switched by the signal pressure formed in the joining switch valve signal passage 25 connected to the signal line 23 is ensured.

이상에서와 같이, 본 발명에 의한 건설기계용 유압 합류회로는 아래와 같은 이점을 갖는다.As described above, the hydraulic joining circuit for a construction machine according to the present invention has the following advantages.

신호압 공급으로 절환시 유압펌프의 작동유를 작업장치에 합류시키는 합류 절환밸브의 작동성을 확보하여 작업성 및 신뢰성을 향상시킬 수 있다.When switching to the signal pressure supply, it is possible to improve the workability and reliability by securing the operability of the joining switching valve for joining the hydraulic oil of the hydraulic pump to the work device.

Claims (6)

제1,2,3유압펌프(P1,P2,P3);First, second and third hydraulic pumps P1, P2 and P3; 상기 제1유압펌프(P1)의 유로에 설치되고, 절환시 작업장치에 공급되는 작동유를 각각 제어하는 밸브들로 이루어진 제1절환밸브(A);A first switching valve (A) installed in a flow path of the first hydraulic pump (P1) and configured to control valves for operating oil supplied to a working device at the time of switching; 상기 제2유압펌프(P2)의 유로에 설치되고, 절환시 작업장치에 공급되는 작동유를 각각 제어하는 밸브들로 이루어진 제2절환밸브(B);A second switching valve (B) installed in a flow path of the second hydraulic pump (P2) and configured to control valves for operating oil supplied to a working device at the time of switching; 상기 제3유압펌프(P3)의 유로에 설치되고, 절환시 작업장치에 공급되는 작동유를 각각 제어하는 밸브들로 이루어진 제3절환밸브(C);A third switching valve (C) installed in a flow path of the third hydraulic pump (P3) and configured to control valves for operating oil supplied to a working device at the time of switching; 제1,2유압펌프(P1,P2)의 유로 상류측에 각각 설치되고, 절환시 좌측 및 우측 주행장치에 공급되는 작동유를 각각 제어하는 밸브들로 이루어진 제4절환밸브(D);A fourth switching valve (D) provided at valves upstream of the flow paths of the first and second hydraulic pumps (P1, P2), respectively, and valves for controlling hydraulic oil supplied to the left and right traveling devices at the time of switching; 상기 제3유압펌프(P3)의 유로 하류측에 설치되고, 신호통로(15)에 신호압(Pi1) 공급으로 절환시 제3유압펌프(P3)의 작동유를 제1유압펌프(P1)측 작업장치 또는 제2유압펌프(P2)측 작업장치에 선택적으로 공급하는 합류 절환밸브(E);It is installed on the downstream side of the flow path of the third hydraulic pump (P3), the working oil of the third hydraulic pump (P3) when switching to supply the signal pressure (Pi1) to the signal passage (15) work on the first hydraulic pump (P1) side A joining switching valve (E) for selectively supplying the device or the working device of the second hydraulic pump (P2) side; 상기 합류 절환밸브(E)의 신호통로(15)에 접속되고, 주행장치용 제4절환밸브(D)를 절환시 신호압력이 형성되는 주행장치용 신호라인(13);A traveling device signal line (13) connected to the signal passage (15) of the confluence switching valve (E), the signal pressure being formed when the fourth switching valve (D) for traveling device is switched; 상기 합류 절환밸브(E)의 신호통로(15) 및 주행장치용 신호라인(13)에 입구측이 분기 접속되고, 제1,2유압펌프(P1,P2)에 각각 연결된 작업장치용 제1,2절환밸브(A,B)를 절환시 신호압력이 형성되는 작업장치용 신호라인(14)을 포함하는 것을 특징으로 하는 건설기계용 유압 합류회로.The inlet side is branch-connected to the signal passage 15 and the traveling device signal line 13 of the confluence switching valve E and connected to the first and second hydraulic pumps P1 and P2, respectively. Hydraulic joining circuit for a construction machine, characterized in that it comprises a signal line for the working device 14, the signal pressure is formed when switching the two switching valves (A, B). 청구항 1에 있어서, 상기 주행장치용 신호라인(13)과 작업장치용 신호라인(14)을 연결하는 유로에 설치되고, 일방향으로 작동유의 흐름을 허용하는 체크밸브(16)를 더 포함하는 것을 특징으로 하는 건설기계용 유압 합류회로.The method according to claim 1, characterized in that it further comprises a check valve 16 is installed in the flow path connecting the signal line 13 for the traveling device and the signal line 14 for the working device, and allows the flow of the hydraulic fluid in one direction. Hydraulic joining circuit for construction machinery. 청구항 2에 있어서, 상기 체크밸브(16)는,The method of claim 2, wherein the check valve 16, 상기 작업장치용 신호라인(14)에서 주행장치용 신호라인(13)으로 작동유 흐름을 허용하도록 설치되는 것을 특징으로 하는 건설기계용 유압 합류회로.Hydraulic joining circuit for a construction machine, characterized in that installed to allow the flow of the hydraulic fluid from the signal line for the working device to the signal line for the traveling device (13). 청구항 2에 있어서, 상기 체크밸브(16)는,The method of claim 2, wherein the check valve 16, 상기 주행장치용 신호라인(13)에서 작업장치용 신호라인(14)으로 작동유 흐름을 허용하도록 설치되는 것을 특징으로 하는 건설기계용 유압 합류회로.Hydraulic joining circuit for a construction machine, characterized in that installed to allow the flow of the hydraulic fluid from the signal line for the traveling device signal line (13) to the working device signal line (14). 청구항 1에 있어서, 상기 주행장치용 신호라인(13)에 설치되고, 주행장치용 제4절환밸브(D)를 절환시 주행장치용 신호라인(13)에 신호압력을 형성하는 제1교축부(11)와,The first throttling part of claim 1, wherein the first throttling part is installed on the traveling signal line 13 and forms a signal pressure on the traveling device signal line 13 when the fourth switching valve D for traveling device is switched. 11) and, 상기 합류 절환밸브(E)의 신호통로(15)에 설치되고, 작업장치용 제1,2절환밸브(A,B)를 절환시 작업장치용 신호라인(14) 및 합류 절환밸브(E)의 신호통로(15)에 신호압력을 형성하는 제2교축부(12)를 더 포함하는 것을 특징으로 하는 건설기계용 유압 합류회로.It is installed in the signal passage 15 of the confluence switching valve (E), when switching the first and second switching valves (A, B) for the working device of the signal line (14) for the working device and the confluence switching valve (E). Hydraulic joining circuit for a construction machine, characterized in that it further comprises a second throttle (12) for forming a signal pressure in the signal passage (15). 청구항 1에 있어서, 상기 작업장치용 신호라인(24)에 설치되고, 작업장치용 제1,2절환밸브(A,B)를 절환시 작업장치용 신호라인(24)에 신호압력을 형성하는 제3교축부(21)와,The method according to claim 1, wherein the work device is provided on the signal line 24, and when switching the first and second switching valves (A, B) for the working device to form a signal pressure on the signal line 24 for the working device With three throttles 21, 상기 합류 절환밸브(E)의 신호통로(25)에 설치되고, 주행장치용 제4절환밸브(D)를 절환시 상기 주행장치용 신호라인(23) 및 합류 절환밸브(E)의 신호통로(25)에 신호압력을 형성하는 제4교축부(22)를 더 포함하는 것을 특징으로 하는 건설기계용 유압 합류회로.It is installed in the signal passage 25 of the confluence switching valve (E), when switching the fourth switching valve (D) for the traveling device, the signal passage of the signal line (23) and the confluence switching valve (E) for the traveling device ( A hydraulic confluence circuit for a construction machine, characterized in that it further comprises a fourth throttle portion (22) for forming a signal pressure in the 25).
KR1020070024029A 2007-03-12 2007-03-12 Hydraulic join circuit of construction machine KR100886475B1 (en)

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Citations (4)

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Publication number Priority date Publication date Assignee Title
JPH0329551U (en) * 1989-07-27 1991-03-25
JP2001004405A (en) * 1999-06-22 2001-01-12 Sankyo Seiki Mfg Co Ltd Magnetic encoder device
KR20030038362A (en) * 2001-11-09 2003-05-16 가부시키카이샤 나브코 Hydraulic circuit
KR20060068061A (en) * 2004-12-15 2006-06-21 현대중공업 주식회사 Signal line system of valve

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0329551U (en) * 1989-07-27 1991-03-25
JP2001004405A (en) * 1999-06-22 2001-01-12 Sankyo Seiki Mfg Co Ltd Magnetic encoder device
KR20030038362A (en) * 2001-11-09 2003-05-16 가부시키카이샤 나브코 Hydraulic circuit
KR20060068061A (en) * 2004-12-15 2006-06-21 현대중공업 주식회사 Signal line system of valve

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