KR20100032471A - Control valve of having floating function - Google Patents

Control valve of having floating function Download PDF

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Publication number
KR20100032471A
KR20100032471A KR1020080091376A KR20080091376A KR20100032471A KR 20100032471 A KR20100032471 A KR 20100032471A KR 1020080091376 A KR1020080091376 A KR 1020080091376A KR 20080091376 A KR20080091376 A KR 20080091376A KR 20100032471 A KR20100032471 A KR 20100032471A
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South Korea
Prior art keywords
floating
sleeve
port
control valve
chamber
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KR1020080091376A
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Korean (ko)
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KR101545675B1 (en
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방상호
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볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
    • F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
    • F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
    • F16K11/07—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Multiple-Way Valves (AREA)

Abstract

PURPOSE: A control valve having a floating function is provided to enable efficient use of a work space by removing the need of spaces for floating valve installation and piping. CONSTITUTION: A control valve having a floating function comprises a hydraulic pump(1), a hydraulic cylinder(2), and a main control valve(7). The hydraulic cylinder is connected to the hydraulic pump and drives a work tool. The main control valve includes a first port(5) connected to a large chamber(2a) of the hydraulic cylinder and a second port(6) connected to a small chamber(2b). In the main control valve, a spool(8) is installed to control the amount and direction of oil supplied from the hydraulic pump to the hydraulic cylinder. The spool has a hollow hole(9) connected to the first and the second port. A pilot spool(15) is provided to block a connection path between the first port and the chamber.

Description

플로팅 기능이 구비된 컨트롤밸브{control valve of having floating function}Control valve with having floating function

본 발명은 붐 등과 같은 어태치먼트(attachment)의 플로팅 기능을 구현할 경우, 외부의 별도의 플로팅 밸브를 사용하지 않아 플로팅 밸브의 장착 및 배관을 위한 공간이 불필요 하므로, 해당 부품수를 줄여 원가비용을 절감할 수 있도록 한 플로팅 기능이 구비된 컨트롤밸브에 관한 것이다.When the floating function of an attachment such as a boom is implemented, the present invention does not require an external floating valve, so that space for mounting and piping of the floating valve is unnecessary, thereby reducing the cost of components by reducing the number of parts. The present invention relates to a control valve having a floating function.

더욱 상세하게는, 어태치먼트의 플로팅 기능을 구현할 경우, 메인 컨트롤밸브(MCV) 내에 결합되는 어태치먼트 조작용 스풀을 활용하여 플로팅 기능을 수행할 수 있도록 한 플로팅 기능이 구비된 컨트롤밸브에 관한 것이다.More particularly, the present invention relates to a control valve having a floating function for performing a floating function by utilizing an attachment operation spool coupled in a main control valve MCV when implementing a floating function of an attachment.

전술한 플로팅(floating) 기능은 유압펌프로부터의 작동유가 붐 등의 어태치먼트를 구동시키는 유압실린더에 공급이 일시적으로 차단된 상태에서, 유압실린더의 라지챔버(large chamber)와 스몰챔버(small chamber)가 서로 연통되어 무부하 상태를 유지하게 되는 것을 의미한다.The floating function described above allows the large chamber and the small chamber of the hydraulic cylinder to be turned off while the hydraulic oil from the hydraulic pump is temporarily blocked from supply to the hydraulic cylinder driving the attachments such as the boom. It means that it is in communication with each other to maintain a no-load state.

도 1은 종래 기술에 의한 플로팅 기능을 설명하기 위한 도면으로서,1 is a view for explaining a floating function according to the prior art,

유압펌프(1)와,Hydraulic pump (1),

유압펌프(1)에 연결되어 붐 등의 어태치먼트를 구동시키는 유압실린더(2)와,A hydraulic cylinder 2 connected to the hydraulic pump 1 to drive attachments such as booms,

유압펌프(1)와 유압실린더(2)사이의 유로에 설치되고, 조작레버(3)의 조작으로 인해 절환시 유압실린더(2)를 플로팅 상태로 전환시키는 플로팅 밸브(4)를 포함한다.It is provided in the flow path between the hydraulic pump 1 and the hydraulic cylinder (2), and includes a floating valve (4) for switching the hydraulic cylinder (2) to a floating state during switching due to the operation of the operating lever (3).

즉, 플로팅 밸브(4)에 의해 유압펌프(1)로부터 유압실린더(2)에 공급되는 작동유가 차단되고, 유압실린더(2)의 라지챔버(2a)와, 스몰챔버(2b) 및 탱크통로는 각각 연통된다. 이로 인해 붐 등과 같은 어태치먼트의 플로팅 기능을 구현할 수 있게 된다.That is, the hydraulic oil supplied to the hydraulic cylinder 2 from the hydraulic pump 1 is interrupted by the floating valve 4, and the large chamber 2a, the small chamber 2b, and the tank passage of the hydraulic cylinder 2 are blocked. Each communicates. This makes it possible to implement floating functions of attachments such as booms.

따라서, 붐 등과 같은 어태치먼트의 플로팅 기능을 구현하기 위하여 별도의 플로팅 밸브를 사용하게 되므로, 부품수 증가로 인해 원가비용이 상승되고, 플로팅밸브의 장착 및 배관으로 인한 공간을 확보해야 되는 문제점을 갖는다.Therefore, since a separate floating valve is used to implement a floating function of an attachment such as a boom, the cost is increased due to the increase in the number of parts, and there is a problem in that space for mounting and piping of the floating valve is secured.

도 2에 도시된 바와 같이, 종래 다른 기술에 의한 플로팅 기능이 구비된 컨트롤밸브는,As shown in Figure 2, the control valve having a floating function according to the prior art,

유압펌프(1)와,Hydraulic pump (1),

유압펌프(1)에 연결되어 붐 등의 어태치먼트를 구동시키는 유압실린더(2)와,A hydraulic cylinder 2 connected to the hydraulic pump 1 to drive attachments such as booms,

유압펌프(1)와 유압실린더(2)사이의 유로에 설치되고, 유압실린더(2)의 라지챔버(2a)와 연통되는 제1포트(5) 및 스몰챔버(2b)와 연통되는 제2포트(6)가 각각 형성되는 메인 컨트롤밸브(7)(MCV)와,The second port is installed in the flow path between the hydraulic pump (1) and the hydraulic cylinder (2), the first port (5) and the small port (2b) communicating with the large chamber (2a) of the hydraulic cylinder (2) Main control valve (7) (MCV) (6) are each formed,

메인 컨트롤밸브(7)에 내설되고, 외부로부터의 파일럿 신호압(Pi) 공급으로 절환시 유압펌프(1)로부터 유압실린더(2)에 공급되는 작동유의 양 및 흐름방향을 제어하는 작업장치용 스풀(8)을 포함한다.The spool for work equipment which is built in the main control valve 7 and controls the amount and flow direction of the hydraulic oil supplied from the hydraulic pump 1 to the hydraulic cylinder 2 when switching to the pilot signal pressure Pi supply from the outside. It includes (8).

전술한 유압실린더(2)에 의해 구동되는 붐 등과 같은 어태치먼트의 플로팅 기능을 구현하고자 할 경우, 중립을 유지하는 스풀(8)에 의해 유압펌프(1)로부터의 작동유가 유압실린더(2)에 공급이 일시적으로 차단된다.When implementing the floating function of an attachment such as a boom driven by the hydraulic cylinder 2 described above, the hydraulic oil from the hydraulic pump 1 is supplied to the hydraulic cylinder 2 by the spool 8 which maintains neutrality. This is temporarily blocked.

따라서, 도면에는 미 도시되었으나, 어태치먼트의 플로팅 기능을 구현하기 위하여 메인 컨트롤밸브(7)와 유압실린더(2)사이의 유로에 별도의 플로팅 밸브를 설치해야 되므로, 부품수 증가로 인해 원가비용이 상승되는 문제점을 갖는다.Accordingly, although not shown in the drawing, in order to implement the floating function of the attachment, a separate floating valve must be installed in the flow path between the main control valve 7 and the hydraulic cylinder 2, thereby increasing the cost cost due to the increase in the number of parts. Has the problem.

본 발명의 실시예는, 붐 등과 같은 어태치먼트의 플로팅 기능을 구현할 경우, 메인 컨트롤밸브 내에 결합되는 어태치먼트 조작용 스풀을 활용하여 플로팅 기능을 수행함에 따라, 외부의 별도의 플로팅 밸브를 사용하지 않아 부품수를 줄여 원가비용을 절감하고, 별도의 플로팅 밸브의 장착 및 배관을 위한 공간이 불필요한 플로팅 기능이 구비된 컨트롤밸브와 관련된다.Embodiment of the present invention, when implementing the floating function of the attachment, such as a boom, by performing the floating function utilizing the attachment operation spool coupled in the main control valve, the number of parts without using an external separate floating valve It is related to a control valve equipped with a floating function that reduces the cost by reducing the cost, and requires no space for mounting and piping of a separate floating valve.

본 발명의 실시예에 의한 플로팅 기능이 구비된 컨트롤밸브는,The control valve with a floating function according to an embodiment of the present invention,

유압펌프와,Hydraulic pump,

유압펌프에 연결되고 작업장치를 구동시키는 유압실린더와,A hydraulic cylinder connected to the hydraulic pump and driving the work device;

유압실린더의 라지챔버와 연통되는 제1포트 및 스몰챔버와 연통되는 제2포트가 각각 형성되는 메인 컨트롤밸브와,A main control valve having a first port communicating with the large chamber of the hydraulic cylinder and a second port communicating with the small chamber, respectively;

메인 컨트롤밸브에 내설되고, 절환시 유압펌프로부터 유압실린더에 공급되는 작동유의 양 및 흐름방향을 제어하는 작업장치용 스풀과,A spool for work equipment which is built in the main control valve and controls the amount and flow direction of the hydraulic oil supplied from the hydraulic pump to the hydraulic cylinder at the time of switching;

제1,2포트에 각각 연통되도록 스풀에 형성되는 중공 홀과,A hollow hole formed in the spool so as to communicate with the first and second ports, respectively,

중공 홀의 일측에 탄성지지되고, 중공 홀을 통해 전달되는 압력에 의해 이동시 제1포트, 제2포트 및 탱크챔버에 각각 연통되는 플로팅공이 형성되는 슬리브와,A sleeve elastically supported at one side of the hollow hole and having a floating hole communicating with the first port, the second port, and the tank chamber when moved by the pressure transmitted through the hollow hole,

유압실린더를 플로팅 상태로 전환하기 위해 외부로부터 공급되는 파일럿 신 호압에 의해 절환시, 노치를 통해 슬리브 후단의 챔버와 탱크챔버를 연통시키고, 제1포트와 챔버를 연통시키는 통로를 차단시키는 파일럿 스풀을 포함한다.When switching by the pilot signal pressure supplied from the outside to convert the hydraulic cylinder to the floating state, the pilot spool which communicates the chamber and the tank chamber at the rear end of the sleeve through the notch and blocks the passage connecting the first port and the chamber. Include.

바람직한 실시예에 의하면, 전술한 플로팅공은,According to a preferred embodiment, the above-described floating ball,

슬리브에 축방향으로 형성되어 중공 홀을 통해 제1포트와 연통되는 제1플로팅공과,A first floating hole axially formed in the sleeve and communicating with the first port through the hollow hole,

제1플로팅공에 연통되도록 슬리브에 반경방향으로 관통형성되고, 슬리브의 이동시 제2포트와 연통되는 제2플로팅공과,A second floating hole radially penetrating the sleeve so as to communicate with the first floating hole, the second floating hole communicating with the second port when the sleeve moves;

제1플로팅공에 연통되도록 슬리브에 반경방향으로 관통형성되고, 슬리브의 이동시 탱크챔버와 연통되는 제3플로팅공을 포함한다.And a third floating hole radially penetrating the sleeve so as to communicate with the first floating hole and communicating with the tank chamber when the sleeve moves.

전술한 슬리브는,The sleeve mentioned above,

슬리브의 양단 수압부의 단면적 차이 및 챔버에서 슬리브 후단부를 탄성지지하는 탄성부재의 탄성력에 의해 슬리브를 탄성지지하여, 제1포트에 대해 제2포트 및 탱크챔버를 차단하는 초기상태를 유지하게 된다.The sleeve is elastically supported by the cross-sectional area difference between the pressure receiving portions at both ends of the sleeve and the elastic force of the elastic member elastically supporting the rear end portion of the sleeve to maintain the initial state of blocking the second port and the tank chamber with respect to the first port.

전술한 바와 같이, 본 발명의 실시예에 의한 플로팅 기능이 구비된 컨트롤밸브는 아래와 같은 이점을 갖는다.As described above, the control valve with a floating function according to an embodiment of the present invention has the following advantages.

붐 등과 같은 어태치먼트의 플로팅 기능을 구현할 경우, 외부의 별도의 플로팅 밸브를 사용하지않고 메인 컨트롤밸브 내에 결합되는 어태치먼트 조작용 스풀을 활용함에 따라, 부품수를 줄여 원가비용을 절감하고, 별도의 플로팅 밸브의 장착 및 배관을 위한 공간이 불필요하여 작업공간을 유용하게 활용할 수 있다.When implementing the floating function of attachments such as booms, the attachment cost is reduced by reducing the number of parts by using attachment attachment spools that are combined in the main control valve without using an external floating valve. Space is not needed for installation and piping, so the working space can be usefully used.

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 3 내지 도 5에 도시된 바와 같이, 본 발명의 실시예에 의한 플로팅 기능이 구비된 컨트롤밸브는,As shown in Figure 3 to 5, the control valve with a floating function according to an embodiment of the present invention,

유압펌프(1)와,Hydraulic pump (1),

유압펌프(1)에 연결되고 붐 등의 작업장치를 구동시키는 유압실린더(2)와,A hydraulic cylinder 2 connected to the hydraulic pump 1 and driving a working device such as a boom;

유압실린더(2)의 라지챔버(2a)와 연통되는 제1포트(5) 및 스몰챔버(2b)와 연통되는 제2포트(6)가 각각 형성되는 메인 컨트롤밸브(7)(MCV)와,A main control valve 7 (MCV) having a first port 5 communicating with the large chamber 2a of the hydraulic cylinder 2 and a second port 6 communicating with the small chamber 2b, respectively;

메인 컨트롤밸브(7)에 내설되고, 절환시 유압펌프(1)로부터 유압실린더(2)에 공급되는 작동유의 양 및 흐름방향을 제어하는 작업장치용 스풀(8)과,A spool 8 for work equipment which is built in the main control valve 7 and controls the amount and flow direction of the hydraulic oil supplied from the hydraulic pump 1 to the hydraulic cylinder 2 at the time of switching;

제1,2포트(5,6)에 각각 연통되도록 스풀(8)에 형성되는 중공 홀(9)과,A hollow hole 9 formed in the spool 8 so as to communicate with the first and second ports 5 and 6, respectively;

중공 홀(9)의 일측에 탄성지지되고, 중공 홀(9)을 통해 전달되는 압력에 의해 이동시 제1포트(5), 제2포트(6) 및 탱크챔버(10)에 각각 연통되는 수개의 플로 팅공이 형성되는 슬리브(11)와,A plurality of elastically supported on one side of the hollow hole (9) and communicated to the first port (5), the second port (6) and the tank chamber (10) when moved by the pressure transmitted through the hollow hole (9), respectively. A sleeve 11 in which a floating ball is formed,

유압실린더(2)를 플로팅 상태로 전환하기 위해 외부로부터 공급되는 파일럿 신호압(Pi)에 의해 절환시, 노치(12)를 통해 슬리브(11) 후단의 챔버(13)와 탱크챔버(10)를 연통시키고, 제1포트(5)와 챔버(13)를 연통시키는 통로(14)를 차단시키는 파일럿 스풀(15)을 포함한다.When switching by the pilot signal pressure Pi supplied from the outside to switch the hydraulic cylinder 2 to the floating state, the chamber 13 and the tank chamber 10 at the rear end of the sleeve 11 are connected via the notch 12. And a pilot spool 15 for communicating and for blocking a passage 14 for communicating the first port 5 and the chamber 13.

바람직하게는, 전술한 플로팅공은,Preferably, the above-described floating ball,

슬리브(11)에 축방향으로 형성되어 중공 홀(9)을 통해 제1포트(5)와 연통되는 제1플로팅공(16)과,A first floating hole 16 formed in the sleeve 11 in the axial direction and communicating with the first port 5 through the hollow hole 9,

제1플로팅공(16)에 연통되도록 슬리브(11)에 반경방향으로 관통형성되고, 슬리브(11)의 이동시 제2포트(6)와 연통되는 제2플로팅공(17)과,A second floating hole 17 radially penetrating the sleeve 11 so as to communicate with the first floating hole 16 and communicating with the second port 6 when the sleeve 11 moves;

제1플로팅공(16)에 연통되도록 슬리브(11)에 반경방향으로 관통형성되고, 슬리브(11)의 이동시 탱크챔버(10)와 연통되는 제3플로팅공(18)을 포함한다.It includes a third floating hole 18 is radially penetrated through the sleeve 11 so as to communicate with the first floating hole 16, and communicates with the tank chamber 10 when the sleeve 11 is moved.

전술한 슬리브(11)는,The sleeve 11 described above,

슬리브(11)의 양단 수압부의 단면적 차이 및 챔버(10)에서 슬리브(11) 후단부를 탄성지지하는 탄성부재(19)(압축코일스프링이 사용됨)의 탄성력에 의해 슬리브(11)를 탄성지지하여, 제1포트(5)에 대해 제2포트(6) 및 탱크챔버(10)를 차단하는 초기상태를 유지하게 된다.The sleeve 11 is elastically supported by the cross-sectional area difference between the pressure receiving portions at both ends of the sleeve 11 and the elastic force of the elastic member 19 (compression coil spring is used) that elastically supports the rear end portion of the sleeve 11 in the chamber 10, The initial state of blocking the second port 6 and the tank chamber 10 with respect to the first port 5 is maintained.

이때, 전술한 유압펌프(1)와, 유압실린더(2)와, 메인 컨트롤밸브(7) 등을 포함하는 구성은 도 2에 도시된 것과 실질적으로 동일하게 적용되므로, 이들의 상세한 설명은 생략하고 중복되는 도면부호는 동일하게 표기한다.At this time, the above-described configuration including the hydraulic pump 1, the hydraulic cylinder 2, the main control valve 7 and the like is applied substantially the same as that shown in Figure 2, the detailed description thereof will be omitted Overlapping reference numerals are the same.

이하에서, 본 발명의 실시예에 의한 플로팅 기능이 구비된 컨트롤밸브의 사용예를 첨부된 도면을 참조하여 설명한다.Hereinafter, a use example of a control valve having a floating function according to an embodiment of the present invention will be described with reference to the accompanying drawings.

도 3 및 도 4는 본 발명의 실시예에 의한 플로팅 기능이 구비된 컨트롤밸브에 있어서, 어태치먼트의 플로팅 기능이 사용되지않을 경우를 설명하기 위한 도면이다.3 and 4 are views for explaining a case in which the floating function of the attachment is not used in the control valve with a floating function according to an embodiment of the present invention.

도시된 바와 같이, 전술한 유압실린더(2)의 라지챔버(2a)와 연통되는 제1포트(5)측 압력은 작업장치용 스풀(8)에 축방향으로 형성된 중공 홀(9)을 통해 슬리브(11)의 제1플로팅공(16)에 유입된다(화살표로 표기됨). 동시에 제1포트(5)측 압력은 통로(14)를 통해 파일럿 스풀(15)의 노치(12)를 통해 슬리브(11) 후단의 챔버(13)에 유입된다(화살표로 표기됨).As shown, the pressure on the first port 5 side in communication with the large chamber 2a of the hydraulic cylinder 2 described above is sleeved through a hollow hole 9 formed axially in the spool 8 for the work tool. It flows into the 1st floating ball 16 of (11) (it is shown by the arrow). At the same time the pressure on the first port 5 side enters the chamber 13 behind the sleeve 11 via the notch 12 of the pilot spool 15 via the passage 14 (indicated by arrow).

전술한 중공 홀(9)을 통해 공급되는 압력이 가해지는 슬리브(11) 일단의 수압부의 단면적과, 통로(14)를 통해 공급되는 압력이 가해지는 슬리브(11) 후단의 단면적의 차이와, 챔버(13)에서 슬리브(11) 후단을 탄성지지하는 탄성부재(19)의 탄성력에 의해, 슬리브(11)는 도 4에 도시된 상태를 유지할 수 있다.The difference between the cross-sectional area of the hydraulic section at one end of the sleeve 11 to which the pressure supplied through the hollow hole 9 is applied, and the cross-sectional area of the rear end of the sleeve 11 to which the pressure supplied through the passage 14 is applied, and the chamber By the elastic force of the elastic member 19 which elastically supports the rear end of the sleeve 11 at 13, the sleeve 11 can maintain the state shown in FIG.

따라서, 유압실린더(2)의 라지챔버(2a)와 연통되는 제1포트(5)에 대해, 유압실린더(2)의 스몰챔버(2b)와 연통되는 제2포트(6) 및 탱크챔버(10)를 차단하는 초기상태를 유지할 수 있다.Therefore, with respect to the first port 5 communicating with the large chamber 2a of the hydraulic cylinder 2, the second port 6 and the tank chamber 10 communicating with the small chamber 2b of the hydraulic cylinder 2 You can keep the initial state of blocking).

이때, 붐 등의 어태치먼트를 조작하기 위하여 외부로부터의 파일럿 신호 압(Pi)이 작업장치용 스풀(8)의 일단부에 공급되는 경우, 슬리브(11)는 고정된 상태에서(도 4에 도시된 상태) 작업장치용 스풀(8)이 절환된다. 이로 인해 유압펌프(1)로부터 유압실린더(2)에 공급되는 작동유의 양 및 흐름방향을 제어하여 어태치먼트를 구동시킬 수 있다.At this time, when the pilot signal pressure Pi from the outside is supplied to one end of the spool 8 for the work device in order to operate an attachment such as a boom, the sleeve 11 is fixed (as shown in FIG. 4). Status) The spool 8 for the work tool is switched. Thus, the attachment can be driven by controlling the amount and flow direction of the hydraulic oil supplied from the hydraulic pump 1 to the hydraulic cylinder 2.

도 3 및 도 5는 본 발명의 실시예에 의한 플로팅 기능이 구비된 컨트롤밸브에 있어서, 어태치먼트의 플로팅 기능이 사용되는 경우를 설명하기 위한 도면이다.3 and 5 are views for explaining a case in which the floating function of the attachment is used in the control valve with a floating function according to an embodiment of the present invention.

도시된 바와 같이, 어태치먼트의 플로팅 기능을 구현하기 위하여 외부로부터의 파일럿 신호압(Pi)이 파일럿 스풀(15)의 일단부에 공급됨에 따라, 도 4의 도면상, 좌측방향으로 절환된다.As shown in the figure, as the pilot signal pressure Pi from the outside is supplied to one end of the pilot spool 15 to implement the floating function of the attachment, in the figure of FIG.

이로 인해, 슬리브(11) 후단의 챔버(13) 내의 압력은 파일럿 스풀(15)의 노치(12)를 통해 탱크챔버(10)와 연통된다(화살표로 표기됨). 반면에 통로(14)를 통해 유압실린더(2)의 라지챔버(2a)와 연통되는 제1포트(5)측 압력은 파일럿 스풀(15)에 의해 챔버(13)측으로 공급되는 것이 차단된다.Due to this, the pressure in the chamber 13 behind the sleeve 11 is communicated with the tank chamber 10 via the notch 12 of the pilot spool 15 (indicated by the arrow). On the other hand, the pressure of the first port 5 side communicating with the large chamber 2a of the hydraulic cylinder 2 through the passage 14 is blocked from being supplied to the chamber 13 side by the pilot spool 15.

한편, 슬리브(11)는 중공 홀(9)을 통해 공급되는 압력에 의해 도 4의 도면상, 우측방향으로 이동된다(이때 탄성부재(19)는 압축된다). 이로 인해 유압실린더(2)의 라지챔버(2a)와 연통되는 제1포트(5)측의 작동유 압력은 중공 홀(9)을 통해 슬리브(11)의 제1플로팅공(16)에 유입된다. 제1플로팅공(16)에 유입되는 작동유는 유압실린더(2)의 스몰챔버(2b)와 연통되는 제2포트(6)와 연통되고, 동시에 탱크챔버(10)와 연통된다.On the other hand, the sleeve 11 is moved in the right direction in the drawing of FIG. 4 by the pressure supplied through the hollow hole 9 (the elastic member 19 is compressed at this time). As a result, the hydraulic oil pressure on the side of the first port 5 communicating with the large chamber 2a of the hydraulic cylinder 2 flows into the first floating hole 16 of the sleeve 11 through the hollow hole 9. The hydraulic oil flowing into the first floating hole 16 communicates with the second port 6 communicating with the small chamber 2b of the hydraulic cylinder 2 and simultaneously communicates with the tank chamber 10.

즉, 작업장치용 스풀(8)이 일시적으로 중립상태를 유지하므로 유압펌프(1)로부터 유압실린더(2)에 공급되는 작동유가 일시적으로 차단된 상태에서 유압실리더(2)의 라지챔버(2a)와, 스몰챔버(2b) 및 탱크챔버(10)가 각각 연통된다. 이로 인해 유압실린더(2)의 라지챔버(2a)와 스몰챔버(2b)가 연통되어 무부하 상태를 유지하므로 붐 등의 어태치먼트의 플로팅 기능을 구현할 수 있다.That is, since the work device spool 8 is temporarily maintained in a neutral state, the large chamber 2a of the hydraulic cylinder 2 in a state where the hydraulic oil supplied from the hydraulic pump 1 to the hydraulic cylinder 2 is temporarily blocked. ) And the small chamber 2b and the tank chamber 10 communicate with each other. As a result, the large chamber 2a and the small chamber 2b of the hydraulic cylinder 2 communicate with each other to maintain a no-load state, thereby implementing a floating function of an attachment such as a boom.

전술한 바와 같이, 본 발명의 실시예에 의한 플로팅 기능이 구비된 컨트롤밸브는, 붐 등과 같은 어태치먼트를 조작할 수 있는 메인 컨트롤밸브(MCV) 내에 결합되는 어태치먼트 조작용 스풀을 활용하여 어태치먼트의 플로팅 기능을 수행함에 따라, 외부의 별도의 플로팅 밸브를 사용하지 않아 부품수를 줄이고, 별도의 플로팅 밸브의 장착 및 배관을 위한 공간이 불필요한 것이다.As described above, the control valve with a floating function according to an embodiment of the present invention, the attachment function of the attachment using the attachment operation spool coupled in the main control valve (MCV) that can operate the attachment, such as a boom As it is performed, the use of an external separate floating valve reduces the number of parts, and a space for mounting and piping of a separate floating valve is unnecessary.

도 1은 종래 기술에 의한 플로팅 기능을 설명하기 위한 도면,1 is a view for explaining a floating function according to the prior art,

도 2는 종래 다른 기술에 의한 플로팅 기능이 구비된 컨트롤밸브의 개략도,Figure 2 is a schematic diagram of a control valve with a floating function according to the prior art,

도 3은 본 발명의 실시예에 의한 플로팅 기능이 구비된 컨트롤밸브의 개략도,3 is a schematic view of a control valve with a floating function according to an embodiment of the present invention,

도 4는 본 발명의 실시예에 의한 플로팅 기능이 구비된 컨트롤밸브에서, 어태치먼트의 플로팅 기능이 사용되지않을 경우의 사용상태도,4 is a use state when the floating function of the attachment in the control valve with a floating function according to an embodiment of the present invention,

도 5는 본 발명의 실시예에 의한 플로팅 기능이 구비된 컨트롤밸브에서, 어태치먼트의 플로팅 기능이 사용되는 경우의 사용상태도이다.5 is a state diagram when the floating function of the attachment is used in the control valve with a floating function 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; 유압펌프One; Hydraulic pump

2; 유압실린더2; Hydraulic cylinder

5; 제1포트5; 1st port

6; 제2포트6; 2nd port

7; 메인 컨트롤밸브(MCV)7; Main control valve (MCV)

8; 작업장치용 스풀8; Spool for Work Tool

9; 중공 홀9; Hollow hall

10; 탱크챔버10; Tank chamber

11; 슬리브11; sleeve

12; 노치(notch)12; Notch

13; 챔버13; chamber

14; 통로14; Passage

15; 파일럿 스풀15; Pilot spool

16; 제1플로팅공16; First floating ball

17; 제2플로팅공17; 2nd Floating Ball

18; 제3플로팅공18; 3rd Floating Ball

19; 탄성부재19; Elastic member

Claims (3)

유압펌프;Hydraulic pump; 상기 유압펌프에 연결되고 작업장치를 구동시키는 유압실린더;A hydraulic cylinder connected to the hydraulic pump and driving a work device; 상기 유압실린더의 라지챔버와 연통되는 제1포트 및 스몰챔버와 연통되는 제2포트가 각각 형성되는 메인 컨트롤밸브;A main control valve having a first port communicating with the large chamber of the hydraulic cylinder and a second port communicating with the small chamber, respectively; 상기 메인 컨트롤밸브에 내설되고, 절환시 상기 유압펌프로부터 유압실린더에 공급되는 작동유의 양 및 흐름방향을 제어하는 작업장치용 스풀;A spool installed in the main control valve, the spool for working device controlling the amount and flow direction of the hydraulic oil supplied from the hydraulic pump to the hydraulic cylinder during switching; 상기 제1,2포트에 각각 연통되도록 상기 스풀에 형성되는 중공 홀;A hollow hole formed in the spool so as to communicate with the first and second ports, respectively; 상기 중공 홀의 일측에 탄성지지되고, 상기 중공 홀을 통해 전달되는 압력에 의해 이동시 제1포트, 제2포트 및 탱크챔버에 각각 연통되는 플로팅공이 형성되는 슬리브; 및A sleeve elastically supported at one side of the hollow hole and having a floating hole communicating with the first port, the second port, and the tank chamber when moved by the pressure transmitted through the hollow hole; And 상기 유압실린더를 플로팅 상태로 전환하기 위해 외부로부터 공급되는 파일럿 신호압에 의해 절환시, 노치를 통해 상기 슬리브 후단의 챔버와 상기 탱크챔버를 연통시키고, 상기 제1포트와 상기 챔버를 연통시키는 통로를 차단시키는 파일럿 스풀을 포함하는 것을 특징으로 하는 플로팅 기능이 구비된 컨트롤밸브.When switching by the pilot signal pressure supplied from the outside to switch the hydraulic cylinder to the floating state, a passage for communicating the chamber and the tank chamber in the rear end of the sleeve through a notch, and the first port and the chamber in communication with the Control valve with a floating function characterized in that it comprises a pilot spool to shut off. 청구항 1에 있어서, 상기 플로팅공은,The method according to claim 1, The floating ball, 상기 슬리브에 축방향으로 형성되어 상기 중공 홀을 통해 제1포트와 연통되 는 제1플로팅공과,A first floating hole formed in the sleeve in an axial direction and communicating with the first port through the hollow hole, 상기 제1플로팅공에 연통되도록 슬리브에 반경방향으로 관통형성되고, 상기 슬리브의 이동시 상기 제2포트와 연통되는 제2플로팅공과,A second floating hole formed radially through the sleeve so as to communicate with the first floating hole and communicating with the second port when the sleeve is moved; 상기 제1플로팅공에 연통되도록 슬리브에 반경방향으로 관통형성되고, 상기 슬리브의 이동시 상기 탱크챔버와 연통되는 제3플로팅공을 포함하는 것을 특징으로 하는 플로팅 기능이 구비된 컨트롤밸브.And a third floating hole formed radially through the sleeve so as to communicate with the first floating hole, the third floating hole communicating with the tank chamber when the sleeve is moved. 청구항 1 또는 청구항 2에 있어서, 상기 슬리브는,The method according to claim 1 or 2, wherein the sleeve, 상기 슬리브의 양단 수압부의 단면적 차이 및 상기 챔버에서 상기 슬리브 후단부를 탄성지지하는 탄성부재의 탄성력에 의해 상기 슬리브를 탄성지지하여, 상기 제1포트에 대해 상기 제2포트 및 탱크챔버를 차단하는 초기상태를 유지하는 것을 특징으로 하는 플로팅 기능이 구비된 컨트롤밸브.Initial state in which the sleeve is elastically supported by the cross-sectional area of the pressure receiving portions at both ends of the sleeve and the elastic force of the elastic member elastically supporting the rear end portion of the sleeve to block the second port and the tank chamber from the first port. Control valve with a floating function, characterized in that to maintain.
KR1020080091376A 2008-09-18 2008-09-18 hydraulic circuit of control valve having floating function KR101545675B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015064785A1 (en) * 2013-10-31 2015-05-07 볼보 컨스트럭션 이큅먼트 에이비 Flow control valve for construction equipment, having floating function
CN110966429A (en) * 2019-12-31 2020-04-07 无锡市三信传动控制有限公司 High-speed two-position three-way hydraulic valve

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KR102487253B1 (en) * 2015-12-18 2023-01-13 주식회사 모트롤 Hydraulic valve

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JPS6327456Y2 (en) 1981-04-18 1988-07-25

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015064785A1 (en) * 2013-10-31 2015-05-07 볼보 컨스트럭션 이큅먼트 에이비 Flow control valve for construction equipment, having floating function
US10208456B2 (en) 2013-10-31 2019-02-19 Volvo Construction Equipment Ab Flow control valve for construction equipment, having floating function
CN110966429A (en) * 2019-12-31 2020-04-07 无锡市三信传动控制有限公司 High-speed two-position three-way hydraulic valve

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