WO2014034974A1 - Hydraulic system for construction machine - Google Patents

Hydraulic system for construction machine Download PDF

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Publication number
WO2014034974A1
WO2014034974A1 PCT/KR2012/006863 KR2012006863W WO2014034974A1 WO 2014034974 A1 WO2014034974 A1 WO 2014034974A1 KR 2012006863 W KR2012006863 W KR 2012006863W WO 2014034974 A1 WO2014034974 A1 WO 2014034974A1
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WO
WIPO (PCT)
Prior art keywords
attachment
option device
hydraulic
spool
hydraulic pump
Prior art date
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PCT/KR2012/006863
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French (fr)
Korean (ko)
Inventor
방상호
김태훈
Original Assignee
볼보 컨스트럭션 이큅먼트 에이비
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Priority to PCT/KR2012/006863 priority Critical patent/WO2014034974A1/en
Publication of WO2014034974A1 publication Critical patent/WO2014034974A1/en

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/96—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
    • E02F9/2228—Control of flow rate; Load sensing arrangements using pressure-compensating valves including an electronic controller
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/166—Controlling a pilot pressure in response to the load, i.e. supply to at least one user is regulated by adjusting either the system pilot pressure or one or more of the individual pilot command pressures
    • 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
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
    • 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
    • F15B2211/355—Pilot pressure control
    • 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
    • F15B2211/36—Pilot pressure sensing
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • F15B2211/6316—Electronic controllers using input signals representing a pressure the pressure being a pilot pressure
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7135—Combinations of output members of different types, e.g. single-acting cylinders with rotary motors
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/78—Control of multiple output members
    • F15B2211/782—Concurrent control, e.g. synchronisation of two or more actuators

Definitions

  • the present invention relates to a hydraulic system for construction machinery, in particular, in the case of complex operation by operating the optional device and the attachment at the same time, to prevent excessive supply of hydraulic oil toward the low pressure hydraulic actuator due to the pressure difference between the hydraulic actuators
  • a hydraulic system for a construction machine A hydraulic system for a construction machine.
  • a construction machine such as an excavator removes the bucket from the arm so as to maximize work efficiency, and works with an optional device such as a hydraulic breaker having a relatively low operating pressure.
  • the main control valve is provided with a plurality of spools for the attachment and the spool for the option device so as to control the hydraulic oil supplied to the attachment such as the bucket or the hydraulic device such as the hydraulic breaker.
  • hydraulic pumps A plurality of main variable displacement hydraulic pumps (hereinafter referred to as "hydraulic pumps") connected to the engine,
  • Two or more hydraulic actuators (such as boom cylinders, etc.) connected to the hydraulic pump to share them,
  • An optional device for outputting an operation signal according to the driver's operation for example, a hydraulic breaker, etc.
  • a control lever 1 and an attachment control lever 2 for example, a hydraulic breaker, etc.
  • An option spool (3) installed in the flow path between the hydraulic pump and the option device to control the flow direction of the hydraulic oil supplied to the option device at the time of switching due to the operation of the option device operating lever (1),
  • It is provided in the flow path between the hydraulic pump and the attachment, and has an attachment spool (4) for controlling the start, stop and direction change of the attachment during switching due to the operation of the attachment operating lever (2).
  • the hydraulic oil from the hydraulic pump is excessively supplied to the option. That is, the hydraulic oil discharged from the hydraulic pump is excessively supplied to the option device with a relatively low pressure, which is beyond the intention of the driver.
  • the driver has difficulty in smoothly manipulating these hydraulic actuators, and also has a problem in that workability is deteriorated because the operation of the hydraulic oil is not supplied as much as the amount of the hydraulic oil is set to the attachment where the relatively high pressure is generated.
  • An embodiment of the present invention relates to a hydraulic system for a construction machine, in which a pressure difference between hydraulic actuators can be formed by reducing the pressure difference between hydraulic actuators when a combination operation is performed simultaneously with an option device and attachments having different operating pressures. do.
  • Variable displacement hydraulic pump connected to the engine
  • Optional device operation lever and attachment operation lever for outputting an operation signal according to the driver's operation
  • An attachment spool installed in the flow path between the hydraulic pump and the attachment, which controls the start, stop and direction change of the attachment during the changeover due to the operation of the attachment operating lever;
  • An electronic proportional pressure reducing valve installed in the signal path between the optional device operating lever and the optional device spool and outputting a secondary signal pressure corresponding to a control signal from the outside;
  • the control unit for inputting a control signal to the electromagnetic proportional pressure reducing valve
  • the opening area of the option device spool is controlled by the secondary signal pressure corresponding to the control signal from the control unit.
  • Variable displacement hydraulic pump connected to the engine
  • Optional device operation lever and attachment operation lever for outputting an operation signal according to the driver's operation
  • An attachment spool installed in the flow path between the hydraulic pump and the attachment, which controls the start, stop and direction change of the attachment during the changeover due to the operation of the attachment operating lever;
  • Hydraulic pressure reducing valve is installed in the signal path between the option device operating lever and the option device spool, and is operated by the signal pressure by the operation of the attachment operation lever to control the signal pressure applied to the option device spool by the operation of the option device operating lever.
  • the open area of the optional device spool is controlled by controlling the hydraulic pressure reducing valve by the signal pressure by operating the attachment operating lever.
  • Variable displacement hydraulic pump connected to the engine
  • Optional device operation lever and attachment operation lever for outputting an operation signal according to the driver's operation
  • An attachment spool installed in the flow path between the hydraulic pump and the attachment, which controls the start, stop and direction change of the attachment during the changeover due to the operation of the attachment operating lever;
  • option device operation lever side is operated by the signal pressure by the operation of the attachment operation lever, and has a control valve for controlling the signal pressure applied to the option device spool by the operation of the option device operation lever secondary.
  • the opening area of the option device spool is controlled by controlling the control valve by the signal pressure by the operation of the attachment operating lever.
  • Hydraulic system for a construction machine according to an embodiment of the present invention configured as described above has the following advantages.
  • the pressure difference between the hydraulic actuators prevents excessive supply of hydraulic oil to the lower pressure actuators, and forms the required pressure for the hydraulic actuators. It can operate easily, and can improve operability and workability.
  • FIG. 1 is a schematic diagram of a hydraulic system for a construction machine according to the prior art
  • FIG. 2 is a schematic diagram of a hydraulic system for a construction machine according to a first embodiment of the present invention
  • FIG. 3 is a schematic diagram of a hydraulic system for a construction machine according to a second embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a hydraulic system for a construction machine according to a third embodiment of the present invention.
  • FIG. 2 is a schematic hydraulic circuit diagram of a hydraulic system for a construction machine according to a first embodiment of the present invention.
  • Hydraulic pump Variable displacement hydraulic pump
  • An optional device e.g., hydraulic breaker, etc.
  • attachment e.g., boom, etc.
  • An optional device spool (3) installed in the flow path between the hydraulic pump and the optional device, for controlling the flow direction of the hydraulic oil supplied to the optional device at the time of switching due to the operation of the optional device operating lever (1),
  • An attachment spool (4) installed in the flow path between the hydraulic pump and the attachment, which controls the start, stop and direction change of the attachment during switching due to the operation of the attachment operation lever (2);
  • An electromagnetic proportional pressure reducing valve (5) installed in the signal path between the optional device operating lever (1) and the optional device spool (3) and outputting a secondary signal pressure corresponding to a control signal (representing a set current value) from the outside (5). ) (PPRV),
  • the control unit 6 for inputting a control signal to the electromagnetic proportional pressure reducing valve 5,
  • the option device spool is driven by the secondary signal pressure corresponding to the control signal from the control unit 6.
  • the opening area of (3) is controlled.
  • the option device spool 3 is switched by the signal pressure by the operation of the option device operating lever 1, and at the same time, the attachment operation lever 2 is operated to By switching the attachment spool 4, the hydraulic oil discharged from the hydraulic pump is distributed and supplied to the option device and the attachment.
  • the load pressure generated in the attachment is relatively higher than the load pressure generated in the option. This allows the hydraulic oil from the hydraulic pump to be supplied in excess of the set flow rate towards the lower pressure option.
  • the option device spool (by the secondary signal pressure output from the electromagnetic proportional pressure reducing valve 5 corresponding to the current value)
  • the opening area of 3 is controlled (that is, the opening of the optional device spool 3 is reduced).
  • FIG. 3 is a schematic hydraulic circuit diagram of a hydraulic system for a construction machine according to a second embodiment of the present invention.
  • hydraulic pump Variable displacement hydraulic pump
  • An optional device e.g., hydraulic breaker, etc.
  • attachment e.g., boom, etc.
  • An optional device spool (3) installed in the flow path between the hydraulic pump and the optional device, for controlling the flow direction of the hydraulic oil supplied to the optional device at the time of switching due to the operation of the optional device operating lever (1),
  • An attachment spool (4) installed in the flow path between the hydraulic pump and the attachment, which controls the start, stop and direction change of the attachment during switching due to the operation of the attachment operation lever (2);
  • the attachment operating lever ( The signal pressure by the operation of 2) is transmitted to the hydraulic pressure reducing valve 7 via the signal passage a.
  • the opening area of the option device spool 3 is controlled by the reduced signal pressure passing through the hydraulic pressure reducing valve 7 controlled by the signal pressure by the operation of the attachment operation lever 2 (the option device spool 3 To reduce the opening). Therefore, it is possible to control that the hydraulic oil discharged from the hydraulic pump is excessively supplied to the option device having a relatively low pressure than the attachment side with a high pressure.
  • FIG. 4 is a schematic hydraulic circuit diagram of a hydraulic system for a construction machine according to a third embodiment of the present invention.
  • hydraulic pump Variable displacement hydraulic pump
  • An optional device e.g., hydraulic breaker, etc.
  • attachment e.g., boom, etc.
  • An optional device spool (3) installed in the flow path between the hydraulic pump and the optional device, for controlling the flow direction of the hydraulic oil supplied to the optional device at the time of switching due to the operation of the optional device operating lever (1),
  • An attachment spool (4) installed in the flow path between the hydraulic pump and the attachment, which controls the start, stop and direction change of the attachment during switching due to the operation of the attachment operation lever (2);
  • control valve (8) When combined operation is performed by driving the option device and the attachment by simultaneously operating the optional device operating lever (1) and the attachment operating lever (2), the control valve (8) is controlled by the signal pressure caused by the operation of the attachment operating lever (2). By controlling, the opening area of the option device spool 3 is controlled.
  • the attachment operating lever ( The signal pressure by the operation of 2) is transmitted to the control valve 8 via the signal passage a.
  • the signal pressure applied to the option device spool 3 due to the operation of the option device operating lever 1 is secondarily controlled by the signal pressure by the operation of the attachment operation lever 2. That is, the signal pressure reduced by the control valve 8 is applied to the option device spool 3 to control the opening area of the option device spool 3 (that is, to reduce the opening of the option device spool 3). Therefore, it is possible to control that the hydraulic oil discharged from the hydraulic pump is excessively supplied to the option device having a relatively low pressure than the attachment side with a high pressure.

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

Abstract

Disclosed is a hydraulic system for a construction machine which prevents a working fluid from being excessively supplied to a hydraulic actuator of a lower pressure due to a pressure difference between hydraulic actuators when working with both an option device and an attachment, simultaneously operating. The hydraulic system for a construction machine according to the present invention comprises: a hydraulic pump connected to an engine; an option device and attachment connected to the hydraulic pump; an option device operational lever and an attachment operational lever for generating an operational signal according to the operator's operation; an option device spool arranged in the flow path between the hydraulic pump and the option device so as to control the flow direction of the working fluid supplied to the option device during switching due to the operation of the option device operational lever; an attachment spool arranged in the flow path between the hydraulic pump and the attachment so as to control the starting, stopping and directional change of the attachment during switching due to the operation of the attachment operational lever; an electronic proportional pressure reducing valve arranged in the signal path between the option device operational lever and the option device spool so as to generate a secondary signal pressure corresponding to an external control signal; and a control unit for inputting a control signal into the electronic proportional pressure reducing valve.

Description

건설기계용 유압시스템Hydraulic System for Construction Machinery
본 발명은 건설기계용 유압시스템에 관한 것으로, 특히 옵션장치와 어태치먼트를 동시에 조작하여 복합 작업하는 경우, 유압 액츄에이터 간의 압력 차이로 인해 압력이 낮은 유압 액츄에이터쪽으로 과다하게 작동유가 공급되는 것을 방지할 수 있도록 한 건설기계용 유압시스템에 관한 것이다.The present invention relates to a hydraulic system for construction machinery, in particular, in the case of complex operation by operating the optional device and the attachment at the same time, to prevent excessive supply of hydraulic oil toward the low pressure hydraulic actuator due to the pressure difference between the hydraulic actuators A hydraulic system for a construction machine.
일반적으로, 굴삭기 등의 건설기계는 작업능률을 극대화할 수 있도록 아암으로부터 버킷을 탈거하고, 작동 압력이 상대적으로 낮은 유압 브레이커 등의 옵션장치를 선택적으로 장착하여 작업하게 된다. 이때 버킷 등의 어태치먼트 또는 유압 브레이커 등의 옵션장치에 공급되는 작동유를 제어할 수 있도록 메인 컨트롤밸브(MCV)에 복수의 어태치먼트용 스풀과 옵션장치용 스풀이 각각 구비된다.In general, a construction machine such as an excavator removes the bucket from the arm so as to maximize work efficiency, and works with an optional device such as a hydraulic breaker having a relatively low operating pressure. At this time, the main control valve (MCV) is provided with a plurality of spools for the attachment and the spool for the option device so as to control the hydraulic oil supplied to the attachment such as the bucket or the hydraulic device such as the hydraulic breaker.
도 1에 도시된 종래 기술에 의한 건설기계용 유압시스템은,Hydraulic system for construction machinery according to the prior art shown in Figure 1,
엔진에 연결되는 복수의 메인 가변용량형 유압펌프(이하 "유압펌프" 라고 말함)와,A plurality of main variable displacement hydraulic pumps (hereinafter referred to as "hydraulic pumps") connected to the engine,
유압펌프에 이를 공유하도록 연결되는 2개 이상의 유압 액츄에이터(일 예로서 붐실린더 등을 말함)와,Two or more hydraulic actuators (such as boom cylinders, etc.) connected to the hydraulic pump to share them,
운전자의 조작에 따른 조작신호를 출력하는 옵션장치(일 예로서 유압 브레이커 등을 말함) 조작레버(1) 및 어태치먼트 조작레버(2)(RCV lever)와An optional device for outputting an operation signal according to the driver's operation (for example, a hydraulic breaker, etc.) and a control lever 1 and an attachment control lever 2 (RCV lever)
유압펌프와 옵션장치사이의 유로에 설치되며, 옵션장치 조작레버(1)의 조작으로 인해 절환시 옵션장치에 공급되는 작동유 흐름 방향을 제어하는 옵션장치 스풀(option spool)(3)과,An option spool (3) installed in the flow path between the hydraulic pump and the option device to control the flow direction of the hydraulic oil supplied to the option device at the time of switching due to the operation of the option device operating lever (1),
유압펌프와 어태치먼트사이의 유로에 설치되며, 어태치먼트 조작레버(2)의 조작으로 인해 절환시 어태치먼트의 기동, 정지 및 방향 전환을 제어하는 어태치먼트 스풀(attachment spool)(4)을 구비한다. It is provided in the flow path between the hydraulic pump and the attachment, and has an attachment spool (4) for controlling the start, stop and direction change of the attachment during switching due to the operation of the attachment operating lever (2).
전술한 구성을 따르면, 옵션장치 조작레버(1) 및 어태치먼트 조작레버(2)를 동시에 조작하여 옵션장치와 어태치먼트를 작동시켜 복합 작업할 경우, 옵션장치와 어태치먼트에 발생되는 압력 차이(옵션장치보다 어태치먼트측에 상대적으로 높은 압력이 발생됨)로 인해 유압펌프로부터의 작동유는 옵션장치쪽으로 과다하게 공급된다. 즉 유압펌프로부터 토출되는 작동유가 운전자 의도에 벗어나 압력이 상대적으로 낮은 옵션장치쪽으로 과다하게 공급되어진다.According to the above-described configuration, the pressure difference generated in the option device and the attachment when the option device and the attachment operating lever 2 are operated at the same time to operate the option device and the attachment (the attachment rather than the attachment) Relatively high pressure on the side), the hydraulic oil from the hydraulic pump is excessively supplied to the option. That is, the hydraulic oil discharged from the hydraulic pump is excessively supplied to the option device with a relatively low pressure, which is beyond the intention of the driver.
따라서, 운전자는 이들 유압 액츄에이터들을 원활하게 조작하는 어려움이 발생되고, 또한 상대적으로 높은 압력이 발생되는 어태치먼트에 설정된 만큼의 작동유가 공급되지않아 이의 작동이 제한되므로 작업성이 떨어지는 문제점을 갖는다.Therefore, the driver has difficulty in smoothly manipulating these hydraulic actuators, and also has a problem in that workability is deteriorated because the operation of the hydraulic oil is not supplied as much as the amount of the hydraulic oil is set to the attachment where the relatively high pressure is generated.
본 발명의 실시예는, 작동 압력이 상이한 옵션장치와 어태치먼트를 동시에 조작하여 복합 작업하는 경우, 유압 액츄에이터 간의 압력 차이를 줄여 유압 액츄에이터에 요구되는 압력을 형성해줄 수 있도록 한 건설기계용 유압시스템과 관련된다.An embodiment of the present invention relates to a hydraulic system for a construction machine, in which a pressure difference between hydraulic actuators can be formed by reducing the pressure difference between hydraulic actuators when a combination operation is performed simultaneously with an option device and attachments having different operating pressures. do.
본 발명의 제1실시예에 의한 건설기계용 유압시스템은,Hydraulic system for a construction machine according to a first embodiment of the present invention,
건설기계용 유압시스템에 있어서,In the hydraulic system for construction machinery,
엔진에 연결되는 가변용량형 유압펌프와,Variable displacement hydraulic pump connected to the engine,
유압펌프에 연결되는 옵션장치 및 어태치먼트와,Optional devices and attachments connected to the hydraulic pump,
운전자의 조작에 따른 조작신호를 출력하는 옵션장치 조작레버 및 어태치먼트 조작레버와,Optional device operation lever and attachment operation lever for outputting an operation signal according to the driver's operation,
유압펌프와 옵션장치사이의 유로에 설치되며, 옵션장치 조작레버의 조작으로 인해 절환시 옵션장치에 공급되는 작동유 흐름 방향을 제어하는 옵션장치 스풀과,It is installed in the flow path between the hydraulic pump and the optional device, and the optional device spool to control the flow direction of the hydraulic fluid supplied to the optional device when switching by the operation of the optional device operating lever,
유압펌프와 어태치먼트사이의 유로에 설치되며, 어태치먼트 조작레버의 조작으로 인해 절환시 어태치먼트의 기동, 정지 및 방향 전환을 제어하는 어태치먼트 스풀과,An attachment spool installed in the flow path between the hydraulic pump and the attachment, which controls the start, stop and direction change of the attachment during the changeover due to the operation of the attachment operating lever;
옵션장치 조작레버와 옵션장치 스풀사이의 신호통로에 설치되며, 외부로부터의 제어신호에 대응되는 2차 신호압력을 출력하는 전자비례감압밸브와,An electronic proportional pressure reducing valve installed in the signal path between the optional device operating lever and the optional device spool and outputting a secondary signal pressure corresponding to a control signal from the outside;
전자비례감압밸브에 제어신호를 입력하는 제어부를 구비하여,The control unit for inputting a control signal to the electromagnetic proportional pressure reducing valve,
옵션장치 조작레버 및 어태치먼트 조작레버의 동시 조작으로 옵션장치와 어태치먼트를 구동시켜 복합 작업하는 경우, 제어부로부터의 제어신호에 대응되는 2차 신호압력에 의해 옵션장치 스풀의 개구면적을 제어한다.In the case where the option device and the attachment operating lever are driven by the simultaneous operation of the option device and the attachment operating lever, the opening area of the option device spool is controlled by the secondary signal pressure corresponding to the control signal from the control unit.
본 발명의 제2실시예에 의한 건설기계용 유압시스템은,Hydraulic system for a construction machine according to a second embodiment of the present invention,
건설기계용 유압시스템에 있어서,In the hydraulic system for construction machinery,
엔진에 연결되는 가변용량형 유압펌프와,Variable displacement hydraulic pump connected to the engine,
유압펌프에 연결되는 옵션장치 및 어태치먼트와,Optional devices and attachments connected to the hydraulic pump,
운전자의 조작에 따른 조작신호를 출력하는 옵션장치 조작레버 및 어태치먼트 조작레버와,Optional device operation lever and attachment operation lever for outputting an operation signal according to the driver's operation,
유압펌프와 옵션장치사이의 유로에 설치되며, 옵션장치 조작레버의 조작으로 인해 절환시 옵션장치에 공급되는 작동유 흐름 방향을 제어하는 옵션장치 스풀과,It is installed in the flow path between the hydraulic pump and the optional device, and the optional device spool to control the flow direction of the hydraulic fluid supplied to the optional device when switching by the operation of the optional device operating lever,
유압펌프와 어태치먼트사이의 유로에 설치되며, 어태치먼트 조작레버의 조작으로 인해 절환시 어태치먼트의 기동, 정지 및 방향 전환을 제어하는 어태치먼트 스풀과,An attachment spool installed in the flow path between the hydraulic pump and the attachment, which controls the start, stop and direction change of the attachment during the changeover due to the operation of the attachment operating lever;
옵션장치 조작레버와 옵션장치 스풀사이의 신호통로에 설치되고, 어태치먼트 조작레버의 조작에 의한 신호압력에 의해 작동되어 옵션장치 조작레버의 조작으로 옵션장치 스풀에 인가되는 신호압력을 제어하는 유압식 감압밸브를 구비하여,Hydraulic pressure reducing valve is installed in the signal path between the option device operating lever and the option device spool, and is operated by the signal pressure by the operation of the attachment operation lever to control the signal pressure applied to the option device spool by the operation of the option device operating lever. With
옵션장치 조작레버 및 어태치먼트 조작레버의 동시 조작으로 옵션장치와 어태치먼트를 구동시켜 복합 작업하는 경우, 어태치먼트 조작레버의 조작에 의한 신호압력에 의해 유압식 감압밸브를 제어하여 옵션장치 스풀의 개구면적을 제어한다.When combined with the optional device operating lever and attachment operating lever to drive the optional device and the attachment, the open area of the optional device spool is controlled by controlling the hydraulic pressure reducing valve by the signal pressure by operating the attachment operating lever. .
본 발명의 제3실시예에 의한 건설기계용 유압시스템은,Hydraulic system for a construction machine according to a third embodiment of the present invention,
건설기계용 유압시스템에 있어서,In the hydraulic system for construction machinery,
엔진에 연결되는 가변용량형 유압펌프와,Variable displacement hydraulic pump connected to the engine,
유압펌프에 연결되는 옵션장치 및 어태치먼트와,Optional devices and attachments connected to the hydraulic pump,
운전자의 조작에 따른 조작신호를 출력하는 옵션장치 조작레버 및 어태치먼트 조작레버와,Optional device operation lever and attachment operation lever for outputting an operation signal according to the driver's operation,
유압펌프와 옵션장치사이의 유로에 설치되며, 옵션장치 조작레버의 조작으로 인해 절환시 옵션장치에 공급되는 작동유 흐름 방향을 제어하는 옵션장치 스풀과,It is installed in the flow path between the hydraulic pump and the optional device, and the optional device spool to control the flow direction of the hydraulic fluid supplied to the optional device when switching by the operation of the optional device operating lever,
유압펌프와 어태치먼트사이의 유로에 설치되며, 어태치먼트 조작레버의 조작으로 인해 절환시 어태치먼트의 기동, 정지 및 방향 전환을 제어하는 어태치먼트 스풀과,An attachment spool installed in the flow path between the hydraulic pump and the attachment, which controls the start, stop and direction change of the attachment during the changeover due to the operation of the attachment operating lever;
옵션장치 조작레버측에 설치되고, 어태치먼트 조작레버의 조작에 의한 신호압력에 의해 작동되어 옵션장치 조작레버의 조작으로 옵션장치 스풀에 인가되는 신호압력을 2차로 제어하는 제어밸브를 구비하여,It is provided on the option device operation lever side, and is operated by the signal pressure by the operation of the attachment operation lever, and has a control valve for controlling the signal pressure applied to the option device spool by the operation of the option device operation lever secondary.
옵션장치 조작레버 및 어태치먼트 조작레버의 동시 조작으로 옵션장치와 어태치먼트를 구동시켜 복합 작업하는 경우, 어태치먼트 조작레버의 조작에 의한 신호압력에 의해 제어밸브를 제어하여 옵션장치 스풀의 개구면적을 제어한다.In the case of combined operation by operating the option device and attachment lever by simultaneous operation of the option device operating lever and attachment operating lever, the opening area of the option device spool is controlled by controlling the control valve by the signal pressure by the operation of the attachment operating lever.
전술한 바와 같이 구성되는 본 발명의 실시예에 의한 건설기계용 유압시스템은 아래와 같은 이점을 갖는다.Hydraulic system for a construction machine according to an embodiment of the present invention configured as described above has the following advantages.
작동 압력이 상이한 옵션장치와 어태치먼트를 동시에 조작하여 복합 작업하는 경우, 유압 액츄에이터 간의 압력 차이로 인해 압력이 낮은 액츄에이터쪽으로 작동유가 과다하게 공급되는 것을 방지하고, 유압 액츄에이터에 요구되는 압력을 형성해주어 이들을 원활하게 조작할 수 있어 조작성 및 작업성을 향상시킬 수 있다.In case of complex operation by operating option device and attachment with different working pressure at the same time, the pressure difference between the hydraulic actuators prevents excessive supply of hydraulic oil to the lower pressure actuators, and forms the required pressure for the hydraulic actuators. It can operate easily, and can improve operability and workability.
도 1은 종래 기술에 의한 건설기계용 유압시스템의 개략도,1 is a schematic diagram of a hydraulic system for a construction machine according to the prior art,
도 2는 본 발명의 제1실시예에 의한 건설기계용 유압시스템의 개략도,2 is a schematic diagram of a hydraulic system for a construction machine according to a first embodiment of the present invention;
도 3은 본 발명의 제2실시예에 의한 건설기계용 유압시스템의 개략도,3 is a schematic diagram of a hydraulic system for a construction machine according to a second embodiment of the present invention;
도 4는 본 발명의 제3실시예에 의한 건설기계용 유압시스템의 개략도이다.4 is a schematic diagram of a hydraulic system for a construction machine according to a third embodiment of the present invention.
〈도면의 주요 부분에 대한 참조 부호의 설명〉<Explanation of reference numerals for the main parts of the drawings>
1; 옵션장치 조작레버One; Option device control lever
2; 어태치먼트 조작레버2; Attachment control lever
3; 옵션장치 스풀3; Option Spool
4; 어태치먼트 스풀4; Attachment Spool
5; 전자비례감압밸브(PPRV)5; Electronic proportional pressure reducing valve (PPRV)
6; 제어부6; Control
7; 유압식 감압밸브7; Hydraulic Pressure Reducing Valve
8; 제어밸브8; Control valve
이하, 첨부도면을 참조하여 본 발명의 바람직한 실시예에 따른 건설기계용 유압시스템을 상세히 설명하기로 한다.Hereinafter, a hydraulic system for construction machinery according to a preferred embodiment of the present invention with reference to the accompanying drawings will be described in detail.
도 2는 본 발명의 제1실시예에 의한 건설기계용 유압시스템의 개략적인 유압회로도이다.2 is a schematic hydraulic circuit diagram of a hydraulic system for a construction machine according to a first embodiment of the present invention.
도 2를 참조하면, 본 발명의 제1실시예에 의한 건설기계용 유압시스템은,2, the hydraulic system for a construction machine according to the first embodiment of the present invention,
건설기계용 유압시스템에 있어서,In the hydraulic system for construction machinery,
엔진에 연결되는 가변용량형 유압펌프(이하, "유압펌프" 라고 말함)와,Variable displacement hydraulic pump (hereinafter referred to as "hydraulic pump") connected to the engine,
유압펌프에 이를 공유하도록 연결되는 옵션장치(일 예로서 유압 브레이커 등을 말함) 및 어태치먼트(일 예로서 붐 등을 말함)와,An optional device (e.g., hydraulic breaker, etc.) and attachment (e.g., boom, etc.) connected to share the hydraulic pump,
운전자의 조작에 따른 조작신호를 출력하는 옵션장치 조작레버(1) 및 어태치먼트 조작레버(2)와,An optional device operating lever (1) and attachment operating lever (2) for outputting an operation signal according to the driver's operation;
유압펌프와 옵션장치사이의 유로에 설치되며, 옵션장치 조작레버(1)의 조작으로 인해 절환시 옵션장치에 공급되는 작동유 흐름 방향을 제어하는 옵션장치 스풀(3)과,An optional device spool (3) installed in the flow path between the hydraulic pump and the optional device, for controlling the flow direction of the hydraulic oil supplied to the optional device at the time of switching due to the operation of the optional device operating lever (1),
유압펌프와 어태치먼트사이의 유로에 설치되며, 어태치먼트 조작레버(2)의 조작으로 인해 절환시 어태치먼트의 기동, 정지 및 방향 전환을 제어하는 어태치먼트 스풀(4)과,An attachment spool (4) installed in the flow path between the hydraulic pump and the attachment, which controls the start, stop and direction change of the attachment during switching due to the operation of the attachment operation lever (2);
옵션장치 조작레버(1)와 옵션장치 스풀(3)사이의 신호통로에 설치되며, 외부로부터의 제어신호(설정된 전류값을 말함)에 대응되는 2차 신호압력을 출력하는 전자비례감압밸브(5)(PPRV)와,An electromagnetic proportional pressure reducing valve (5) installed in the signal path between the optional device operating lever (1) and the optional device spool (3) and outputting a secondary signal pressure corresponding to a control signal (representing a set current value) from the outside (5). ) (PPRV),
전자비례감압밸브(5)에 제어신호를 입력하는 제어부(6)를 구비하여,The control unit 6 for inputting a control signal to the electromagnetic proportional pressure reducing valve 5,
옵션장치 조작레버(1) 및 어태치먼트 조작레버(2)의 동시 조작으로 옵션장치와 어태치먼트를 구동시켜 복합 작업하는 경우, 제어부(6)로부터의 제어신호에 대응되는 2차 신호압력에 의해 옵션장치 스풀(3)의 개구면적을 제어한다.In the case of combined operation by driving the option device and the attachment by simultaneous operation of the option device operating lever 1 and the attachment operating lever 2, the option device spool is driven by the secondary signal pressure corresponding to the control signal from the control unit 6. The opening area of (3) is controlled.
전술한 구성을 따르면, 굴삭기 등의 건설기계 아암으로부터 버킷을 탈거하고, 아암 선단에 유압 브레이커 등의 옵션장치를 선택적으로 장착하여 작업하는 경우가 발생된다. 즉 옵션장치와 어태치먼트를 동시에 구동시켜 복합 작업하기 위하여, 옵션장치 조작레버(1)의 조작에 의한 신호압력에 의해 옵션장치 스풀(3)을 절환하고, 이와 동시에 어태치먼트 조작레버(2)를 조작하여 어태치먼트 스풀(4)을 절환시킴에 따라, 유압펌프로부터 토출되는 작동유는 옵션장치와 어태치먼트에 분배 공급된다. 이경우 옵션장치에 발생되는 부하 압력보다 어태치먼트에 발생되는 부하 압력이 상대적으로 높게 된다. 이로 인해 유압펌프로부터의 작동유는 압력이 낮은 옵션장치쪽으로 설정된 유량을 초과하여 공급된다.According to the above-described configuration, a case arises in which a bucket is removed from a construction machine arm such as an excavator, and an optional device such as a hydraulic breaker is selectively mounted on the arm tip to work. In other words, in order to drive the option device and the attachment at the same time for the combined work, the option device spool 3 is switched by the signal pressure by the operation of the option device operating lever 1, and at the same time, the attachment operation lever 2 is operated to By switching the attachment spool 4, the hydraulic oil discharged from the hydraulic pump is distributed and supplied to the option device and the attachment. In this case, the load pressure generated in the attachment is relatively higher than the load pressure generated in the option. This allows the hydraulic oil from the hydraulic pump to be supplied in excess of the set flow rate towards the lower pressure option.
이때, 전술한 제어부(6)로부터 설정된 전류값이 전자비례감압밸브(5)에 입력될 경우, 전류값에 대응되게 전자비례감압밸브(5)로부터 출력되는 2차 신호압력에 의해 옵션장치 스풀(3)의 개구면적을 제어(옵션장치 스풀(3)의 개구부를 줄이게 됨을 말함)하게 된다. 이로 인해 유압펌프로부터 토출되는 작동유가 압력이 높은 어태치먼트측보다 상대적으로 압력이 낮은 옵션장치쪽으로 과다하게 공급되는 것을 제어할 수 있게 된다. 즉 옵션장치와 어태치먼트 간의 압력차를 줄임에 따라, 운전자 의도에서 벗어나 작동 압력이 낮은 옵션장치쪽으로 과다하게 공급되는 것을 방지하고, 이들 유압 액츄에이터의 작동에 요구되는 압력을 형성하게 되므로 이들을 원활하게 조작할 수 있게 된다.At this time, when the current value set by the control unit 6 is input to the electromagnetic proportional pressure reducing valve 5, the option device spool (by the secondary signal pressure output from the electromagnetic proportional pressure reducing valve 5 corresponding to the current value) The opening area of 3) is controlled (that is, the opening of the optional device spool 3 is reduced). This makes it possible to control that the hydraulic oil discharged from the hydraulic pump is excessively supplied to the option device with a relatively low pressure than the attachment side with a high pressure. In other words, by reducing the pressure difference between the option device and the attachment, it is possible to prevent excessive supply to the option device with low operating pressure, and to create a pressure required for the operation of these hydraulic actuators. It becomes possible.
도 3은 본 발명의 제2실시예에 의한 건설기계용 유압시스템의 개략적인 유압회로도이다.3 is a schematic hydraulic circuit diagram of a hydraulic system for a construction machine according to a second embodiment of the present invention.
도 3을 참조하면, 본 발명의 제2실시예에 의한 건설기계용 유압시스템은,3, the hydraulic system for a construction machine according to a second embodiment of the present invention,
건설기계용 유압시스템에 있어서,In the hydraulic system for construction machinery,
엔진에 연결되는 가변용량형 유압펌프(이하 유압펌프 라고 말함)와,Variable displacement hydraulic pump (hereinafter referred to as hydraulic pump) connected to the engine,
유압펌프에 이를 공유하도록 연결되는 옵션장치(일 예로서 유압 브레이커 등을 말함) 및 어태치먼트(일 예로서 붐 등을 말함)와,An optional device (e.g., hydraulic breaker, etc.) and attachment (e.g., boom, etc.) connected to share the hydraulic pump,
운전자의 조작에 따른 조작신호를 각각 출력하는 옵션장치 조작레버(1) 및 어태치먼트 조작레버(2)와,An optional device operating lever (1) and attachment operating lever (2) for respectively outputting operating signals according to the driver's operation;
유압펌프와 옵션장치사이의 유로에 설치되며, 옵션장치 조작레버(1)의 조작으로 인해 절환시 옵션장치에 공급되는 작동유 흐름 방향을 제어하는 옵션장치 스풀(3)과,An optional device spool (3) installed in the flow path between the hydraulic pump and the optional device, for controlling the flow direction of the hydraulic oil supplied to the optional device at the time of switching due to the operation of the optional device operating lever (1),
유압펌프와 어태치먼트사이의 유로에 설치되며, 어태치먼트 조작레버(2)의 조작으로 인해 절환시 어태치먼트의 기동, 정지 및 방향 전환을 제어하는 어태치먼트 스풀(4)과,An attachment spool (4) installed in the flow path between the hydraulic pump and the attachment, which controls the start, stop and direction change of the attachment during switching due to the operation of the attachment operation lever (2);
옵션장치 조작레버(1)와 옵션장치 스풀(3)사이의 신호통로에 설치되고, 어태치먼트 조작레버(2)의 조작에 의한 신호압력에 의해 작동되어 옵션장치 조작레버(1)의 조작으로 옵션장치 스풀(3)에 인가되는 신호압력을 제어하는 유압식 감압밸브(7)를 구비하여,It is installed in the signal path between the option device operating lever (1) and the option device spool (3), and is operated by the signal pressure by the operation of the attachment operating lever (2), and is operated by the option device operating lever (1). It is provided with a hydraulic pressure reducing valve (7) for controlling the signal pressure applied to the spool (3),
옵션장치 조작레버(1) 및 어태치먼트 조작레버(2)의 동시 조작으로 옵션장치와 어태치먼트를 구동시켜 복합 작업하는 경우, 어태치먼트 조작레버(2)의 조작에 의한 신호압력에 의해 유압식 감압밸브(7)를 제어하여 옵션장치 스풀(3)의 개구면적을 제어한다.When the option device and the attachment control lever 2 are operated simultaneously by the operation of the optional device operating lever 1 and the attachment operating lever 2, the hydraulic pressure reducing valve 7 is driven by the signal pressure by the operation of the attachment operating lever 2. Control the opening area of the option device spool (3).
전술한 구성을 따르면, 전술한 옵션장치 조작레버(1) 및 어태치먼트 조작레버(2)를 동시에 조작하여 옵션장치 스풀(3) 및 어태치먼트 스풀(4)을 절환시켜 복합 작업할 경우, 어태치먼트 조작레버(2)의 조작에 의한 신호압력이 신호통로(a)를 통해 유압식 감압밸브(7)에 전달된다. 이로 인해 어태치먼트 조작레버(2)의 조작에 의한 신호압력에 의해 제어된 유압식 감압밸브(7)를 통과하는 감압된 신호압력에 의해 옵션장치 스풀(3)의 개구면적을 제어(옵션장치 스풀(3)의 개구부를 줄이게 됨을 말함)하게 된다. 따라서 유압펌프로부터 토출되는 작동유가 압력이 높은 어태치먼트측보다 상대적으로 압력이 낮은 옵션장치쪽으로 과다하게 공급되는 것을 제어할 수 있게 된다.According to the above-described configuration, when the option device spool 3 and the attachment spool 4 are switched to operate in combination by simultaneously operating the above-mentioned option device operating lever 1 and the attachment operating lever 2, the attachment operating lever ( The signal pressure by the operation of 2) is transmitted to the hydraulic pressure reducing valve 7 via the signal passage a. Thus, the opening area of the option device spool 3 is controlled by the reduced signal pressure passing through the hydraulic pressure reducing valve 7 controlled by the signal pressure by the operation of the attachment operation lever 2 (the option device spool 3 To reduce the opening). Therefore, it is possible to control that the hydraulic oil discharged from the hydraulic pump is excessively supplied to the option device having a relatively low pressure than the attachment side with a high pressure.
도 4는 본 발명의 제3실시예에 의한 건설기계용 유압시스템의 개략적인 유압회로도이다.4 is a schematic hydraulic circuit diagram of a hydraulic system for a construction machine according to a third embodiment of the present invention.
도 4를 참조하면, 본 발명의 제3실시예에 의한 건설기계용 유압시스템은,4, the hydraulic system for a construction machine according to a third embodiment of the present invention,
건설기계용 유압시스템에 있어서,In the hydraulic system for construction machinery,
엔진에 연결되는 가변용량형 유압펌프(이하 유압펌프 라고 말함)와,Variable displacement hydraulic pump (hereinafter referred to as hydraulic pump) connected to the engine,
유압펌프에 이를 공유하도록 연결되는 옵션장치(일 예로서 유압 브레이커 등을 말함) 및 어태치먼트(일 예로서 붐 등을 말함)와,An optional device (e.g., hydraulic breaker, etc.) and attachment (e.g., boom, etc.) connected to share the hydraulic pump,
운전자의 조작에 따른 조작신호를 출력하는 옵션장치 조작레버(1) 및 어태치먼트 조작레버(2)와,An optional device operating lever (1) and attachment operating lever (2) for outputting an operation signal according to the driver's operation;
유압펌프와 옵션장치사이의 유로에 설치되며, 옵션장치 조작레버(1)의 조작으로 인해 절환시 옵션장치에 공급되는 작동유 흐름 방향을 제어하는 옵션장치 스풀(3)과,An optional device spool (3) installed in the flow path between the hydraulic pump and the optional device, for controlling the flow direction of the hydraulic oil supplied to the optional device at the time of switching due to the operation of the optional device operating lever (1),
유압펌프와 어태치먼트사이의 유로에 설치되며, 어태치먼트 조작레버(2)의 조작으로 인해 절환시 어태치먼트의 기동, 정지 및 방향 전환을 제어하는 어태치먼트 스풀(4)과,An attachment spool (4) installed in the flow path between the hydraulic pump and the attachment, which controls the start, stop and direction change of the attachment during switching due to the operation of the attachment operation lever (2);
옵션장치 조작레버(1)측에 설치되고, 어태치먼트 조작레버(2)의 조작에 의한 신호압력에 의해 작동되어 옵션장치 조작레버(1)의 조작으로 옵션장치 스풀(3)에 인가되는 신호압력을 2차로 제어하는 제어밸브(8)를 구비하여,It is installed on the option device operating lever (1) side and operated by the signal pressure by the operation of the attachment operating lever (2), and the signal pressure applied to the option device spool (3) by the operation of the option device operating lever (1). With a control valve 8 for controlling secondary,
옵션장치 조작레버(1) 및 어태치먼트 조작레버(2)의 동시 조작으로 옵션장치와 어태치먼트를 구동시켜 복합 작업하는 경우, 어태치먼트 조작레버(2)의 조작에 의한 신호압력에 의해 제어밸브(8)를 제어하여 옵션장치 스풀(3)의 개구면적을 제어한다.When combined operation is performed by driving the option device and the attachment by simultaneously operating the optional device operating lever (1) and the attachment operating lever (2), the control valve (8) is controlled by the signal pressure caused by the operation of the attachment operating lever (2). By controlling, the opening area of the option device spool 3 is controlled.
전술한 구성을 따르면, 전술한 옵션장치 조작레버(1) 및 어태치먼트 조작레버(2)를 동시에 조작하여 옵션장치 스풀(3) 및 어태치먼트 스풀(4)을 절환시켜 복합 작업할 경우, 어태치먼트 조작레버(2)의 조작에 의한 신호압력이 신호통로(a)를 통해 제어밸브(8)에 전달된다. 이로 인해 옵션장치 조작레버(1)의 조작으로 인해 옵션장치 스풀(3)에 인가되는 신호압력을 어태치먼트 조작레버(2)의 조작에 의한 신호압력에 의해 2차로 제어한다. 즉 제어밸브(8)에 의해 감압된 신호압력을 옵션장치 스풀(3)에 인가시켜 옵션장치 스풀(3)의 개구면적을 제어(옵션장치 스풀(3)의 개구부를 줄이게 됨을 말함)하게 된다. 따라서 유압펌프로부터 토출되는 작동유가 압력이 높은 어태치먼트측보다 상대적으로 압력이 낮은 옵션장치쪽으로 과다하게 공급되는 것을 제어할 수 있게 된다.According to the above-described configuration, when the option device spool 3 and the attachment spool 4 are switched to operate in combination by simultaneously operating the above-mentioned option device operating lever 1 and the attachment operating lever 2, the attachment operating lever ( The signal pressure by the operation of 2) is transmitted to the control valve 8 via the signal passage a. For this reason, the signal pressure applied to the option device spool 3 due to the operation of the option device operating lever 1 is secondarily controlled by the signal pressure by the operation of the attachment operation lever 2. That is, the signal pressure reduced by the control valve 8 is applied to the option device spool 3 to control the opening area of the option device spool 3 (that is, to reduce the opening of the option device spool 3). Therefore, it is possible to control that the hydraulic oil discharged from the hydraulic pump is excessively supplied to the option device having a relatively low pressure than the attachment side with a high pressure.
여기에서, 상술한 본 발명에서는 바람직한 실시예를 참조하여 설명하였지만, 해당 기술분야에서 숙련된 당업자는 하기의 특허청구범위에 기재된 본 발명의 사상 및 영역으로부터 벗어나지 않는 범위 내에서 본 발명을 다양하게 수정 및 변경할 수 있음을 이해할 수 있을 것이다.Herein, while the present invention has been described with reference to the preferred embodiments, those skilled in the art will variously modify the present invention without departing from the spirit and scope of the invention as set forth in the claims below. And can be changed.
전술한 구성을 갖는 본 발명에 따르면, 작동 압력이 상이한 옵션장치와 어태치먼트를 동시에 조작하여 복합 작업하는 경우 유압 액츄에이터 간의 압력 차이로 인해 압력이 상대적으로 낮은 옵션장치쪽으로 과다하게 작동유 공급되는 것을 제어할 수 있는 효과가 있다.According to the present invention having the above-described configuration, when combined operation by operating the option device and the attachment with different operating pressure at the same time, it is possible to control the excessive supply of hydraulic oil toward the option device with a relatively low pressure due to the pressure difference between the hydraulic actuators It has an effect.

Claims (3)

  1. 건설기계용 유압시스템에 있어서:In the hydraulic system for construction machinery:
    엔진에 연결되는 유압펌프와,A hydraulic pump connected to the engine,
    상기 유압펌프에 연결되는 옵션장치 및 어태치먼트와,An optional device and attachment connected to the hydraulic pump,
    운전자의 조작에 따른 조작신호를 출력하는 옵션장치 조작레버 및 어태치먼트 조작레버와,Optional device operation lever and attachment operation lever for outputting an operation signal according to the driver's operation,
    상기 유압펌프와 옵션장치사이의 유로에 설치되며, 상기 옵션장치 조작레버의 조작으로 인해 절환시 옵션장치에 공급되는 작동유 흐름 방향을 제어하는 옵션장치 스풀과,An option device spool installed in a flow path between the hydraulic pump and the option device, for controlling the flow direction of the hydraulic oil supplied to the option device at the time of switching due to the operation of the option device operation lever;
    상기 유압펌프와 어태치먼트사이의 유로에 설치되며, 상기 어태치먼트 조작레버의 조작으로 인해 절환시 어태치먼트의 기동, 정지 및 방향 전환을 제어하는 어태치먼트 스풀과,An attachment spool installed in a flow path between the hydraulic pump and the attachment and controlling the start, stop and direction change of the attachment during switching due to the operation of the attachment operation lever;
    상기 옵션장치 조작레버와 옵션장치 스풀사이의 신호통로에 설치되며, 외부로부터의 제어신호에 대응되는 2차 신호압력을 출력하는 전자비례감압밸브와,An electronic proportional pressure reducing valve installed in a signal path between the option device operating lever and the option device spool and outputting a secondary signal pressure corresponding to a control signal from the outside;
    상기 전자비례감압밸브에 제어신호를 입력하는 제어부를 구비하여,The control unit for inputting a control signal to the electromagnetic proportional pressure reducing valve,
    상기 옵션장치 조작레버 및 어태치먼트 조작레버의 동시 조작으로 옵션장치와 어태치먼트를 구동시켜 복합 작업하는 경우, 상기 제어부로부터의 제어신호에 대응되는 2차 신호압력에 의해 상기 옵션장치 스풀의 개구면적을 제어하는 것을 특징으로 하는 건설기계용 유압시스템.In the case where the option device and the attachment operation lever are operated simultaneously with the option device and the attachment operation lever, the opening area of the option device spool is controlled by the secondary signal pressure corresponding to the control signal from the control unit. Hydraulic system for a construction machine, characterized in that.
  2. 건설기계용 유압시스템에 있어서:In the hydraulic system for construction machinery:
    엔진에 연결되는 유압펌프와,A hydraulic pump connected to the engine,
    상기 유압펌프에 연결되는 옵션장치 및 어태치먼트와,An optional device and attachment connected to the hydraulic pump,
    운전자의 조작에 따른 조작신호를 출력하는 옵션장치 조작레버 및 어태치먼트 조작레버와,Optional device operation lever and attachment operation lever for outputting an operation signal according to the driver's operation,
    상기 유압펌프와 옵션장치사이의 유로에 설치되며, 상기 옵션장치 조작레버의 조작으로 인해 절환시 옵션장치에 공급되는 작동유 흐름 방향을 제어하는 옵션장치 스풀과,An option device spool installed in a flow path between the hydraulic pump and the option device, for controlling the flow direction of the hydraulic oil supplied to the option device at the time of switching due to the operation of the option device operation lever;
    상기 유압펌프와 어태치먼트사이의 유로에 설치되며, 상기 어태치먼트 조작레버의 조작으로 인해 절환시 어태치먼트의 기동, 정지 및 방향 전환을 제어하는 어태치먼트 스풀과,An attachment spool installed in a flow path between the hydraulic pump and the attachment and controlling the start, stop and direction change of the attachment during switching due to the operation of the attachment operation lever;
    상기 옵션장치 조작레버와 옵션장치 스풀사이의 신호통로에 설치되고, 상기 어태치먼트 조작레버의 조작에 의한 신호압력에 의해 작동되어 상기 옵션장치 조작레버의 조작으로 상기 옵션장치 스풀에 인가되는 신호압력을 제어하는 유압식 감압밸브를 구비하여,It is installed in the signal path between the option device operating lever and the option device spool, and is operated by the signal pressure by the operation of the attachment operation lever to control the signal pressure applied to the option device spool by the operation of the option device operating lever. Hydraulic pressure reducing valve is provided,
    상기 옵션장치 조작레버 및 어태치먼트 조작레버의 동시 조작으로 옵션장치와 어태치먼트를 구동시켜 복합 작업하는 경우, 상기 어태치먼트 조작레버의 조작에 의한 신호압력에 의해 상기 유압식 감압밸브를 제어하여 상기 옵션장치 스풀의 개구면적을 제어하는 것을 특징으로 하는 건설기계용 유압시스템.In the case where the option device and the attachment operating lever are operated simultaneously to drive the option device and the attachment, the hydraulic pressure reducing valve is controlled by the signal pressure by the operation of the attachment operation lever to open the option device spool. Hydraulic system for construction machinery, characterized in that to control the area.
  3. 건설기계용 유압시스템에 있어서:In the hydraulic system for construction machinery:
    엔진에 연결되는 유압펌프와,A hydraulic pump connected to the engine,
    상기 유압펌프에 연결되는 옵션장치 및 어태치먼트와,An optional device and attachment connected to the hydraulic pump,
    운전자의 조작에 따른 조작신호를 출력하는 옵션장치 조작레버 및 어태치먼트 조작레버와,Optional device operation lever and attachment operation lever for outputting an operation signal according to the driver's operation,
    상기 유압펌프와 옵션장치사이의 유로에 설치되며, 상기 옵션장치 조작레버의 조작으로 인해 절환시 옵션장치에 공급되는 작동유 흐름 방향을 제어하는 옵션장치 스풀과,An option device spool installed in a flow path between the hydraulic pump and the option device, for controlling the flow direction of the hydraulic oil supplied to the option device at the time of switching due to the operation of the option device operation lever;
    상기 유압펌프와 어태치먼트사이의 유로에 설치되며, 상기 어태치먼트 조작레버의 조작으로 인해 절환시 어태치먼트의 기동, 정지 및 방향 전환을 제어하는 어태치먼트 스풀과,An attachment spool installed in a flow path between the hydraulic pump and the attachment and controlling the start, stop and direction change of the attachment during switching due to the operation of the attachment operation lever;
    상기 옵션장치 조작레버측에 설치되고, 상기 어태치먼트 조작레버의 조작에 의한 신호압력에 의해 작동되어 상기 옵션장치 조작레버의 조작으로 상기 옵션장치 스풀에 인가되는 신호압력을 2차로 제어하는 제어밸브를 구비하여,A control valve mounted on the option device operating lever side and operated by signal pressure by the operation of the attachment operation lever to control the signal pressure applied to the option device spool by the operation of the option device operating lever secondly; So,
    상기 옵션장치 조작레버 및 어태치먼트 조작레버의 동시 조작으로 옵션장치와 어태치먼트를 구동시켜 복합 작업하는 경우, 상기 어태치먼트 조작레버의 조작에 의한 신호압력에 의해 상기 제어밸브를 제어하여 상기 옵션장치 스풀의 개구면적을 제어하는 것을 특징으로 하는 건설기계용 유압시스템.In the case where the option device and the attachment operating lever are operated simultaneously with the option device and the attachment operating lever, the combined operation is performed by controlling the control valve by the signal pressure by the operation of the attachment operating lever to open the area of the option device spool. Hydraulic system for construction machinery, characterized in that for controlling.
PCT/KR2012/006863 2012-08-28 2012-08-28 Hydraulic system for construction machine WO2014034974A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08291539A (en) * 1995-04-20 1996-11-05 Shin Caterpillar Mitsubishi Ltd Rectilinear traveling control method of construction machine vehicle and its circuit
JPH09296803A (en) * 1996-04-30 1997-11-18 Nachi Fujikoshi Corp Hydraulic driving device and proportioning pressure reducing valve for hydraulic driving device
JP2001099106A (en) * 1999-09-28 2001-04-10 Kobe Steel Ltd Hydraulic cylinder controller of construction machine
JP2002115274A (en) * 2000-10-06 2002-04-19 Komatsu Ltd Attachment controller for hydraulic backhoe
JP2004124377A (en) * 2002-09-30 2004-04-22 Hitachi Constr Mach Co Ltd Controller for construction machinery, and radio control system for construction machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08291539A (en) * 1995-04-20 1996-11-05 Shin Caterpillar Mitsubishi Ltd Rectilinear traveling control method of construction machine vehicle and its circuit
JPH09296803A (en) * 1996-04-30 1997-11-18 Nachi Fujikoshi Corp Hydraulic driving device and proportioning pressure reducing valve for hydraulic driving device
JP2001099106A (en) * 1999-09-28 2001-04-10 Kobe Steel Ltd Hydraulic cylinder controller of construction machine
JP2002115274A (en) * 2000-10-06 2002-04-19 Komatsu Ltd Attachment controller for hydraulic backhoe
JP2004124377A (en) * 2002-09-30 2004-04-22 Hitachi Constr Mach Co Ltd Controller for construction machinery, and radio control system for construction machine

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