KR20190113419A - Oil-pressure control circuit of excavator - Google Patents

Oil-pressure control circuit of excavator Download PDF

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Publication number
KR20190113419A
KR20190113419A KR1020180036078A KR20180036078A KR20190113419A KR 20190113419 A KR20190113419 A KR 20190113419A KR 1020180036078 A KR1020180036078 A KR 1020180036078A KR 20180036078 A KR20180036078 A KR 20180036078A KR 20190113419 A KR20190113419 A KR 20190113419A
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South Korea
Prior art keywords
hydraulic
pump
pressure
fluid
hydraulic cylinder
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KR1020180036078A
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Korean (ko)
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김재은
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중부종합기계 주식회사
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Priority to KR1020180036078A priority Critical patent/KR20190113419A/en
Publication of KR20190113419A publication Critical patent/KR20190113419A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
    • F02D29/04—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • 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
    • 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
    • F15B2211/20576—Systems with pumps with multiple pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The present invention relates to an industrial hydraulic device, comprising: a hydraulic cylinder for the operation of an injection pump to supply fuel to the hydraulic device; a throttle valve provided on a discharge route of fluid (oil) supplied to the hydraulic cylinder to adjust the hydraulic pressure in the hydraulic cylinder; a relief valve provided on a fluid discharge path of the throttle valve and closing or opening a recovery flow path; a hydraulic pump to supply the fluid of a predetermined pressure to the hydraulic cylinder; and a solenoid valve located on a delivery path of the fluid supplied from the hydraulic pump to the hydraulic cylinder and closing or opening a fluid supply flow path. Here, the hydraulic pump comprises a main pump and an auxiliary pump, wherein the auxiliary pump supplies the fluid of a predetermined pressure towards the hydraulic cylinder through the solenoid valve. Furthermore, a fuel saving device for an industrial hydraulic device is characterized by comprising: a relay adjusting an opened degree of the solenoid valve corresponding to the state of inputted voltage; a pressure sensor detecting the change and the size of pressure corresponding to the operation of a main pump; and an indicator which receives a detection signal of the pressure sensor, and linearly supplies power supplied from an internal battery of the industrial hydraulic device to the relay corresponding to the size of the detection signal. Therefore, the output of an engine is repeatedly increased and decreased corresponding to a change in the pressure of a working device. In addition, the injection amount of the engine is simultaneously adjusted when the pressure state of the hydraulic pump is at a low pressure and when the same is at a high pressure. Resultantly, the entire fuel consumption is reduced.

Description

유압기기 연료 절감 장치{OIL-PRESSURE CONTROL CIRCUIT OF EXCAVATOR}Hydraulic device fuel saving device {OIL-PRESSURE CONTROL CIRCUIT OF EXCAVATOR}

일반적으로, 굴삭기나 지게차와 같은 종래의 산업용 차량은 작업 부하가 최대일 경우에 맞추어 엔진의 출력 토In general, conventional industrial vehicles, such as excavators and forklifts, have the engine's output torque at peak loads.

오크가 설정되어져 있다Orc is set

<3> 예를 들어, 굴삭기의 경우 작업 장치에 흙을 가득 담아 올릴 때의 높은 압력과 내릴 때의 압력차이 혹은 회전을<3> For example, in the case of an excavator, the difference between the high pressure and the lower pressure when the working device is filled with soil

시작할 때의 높은 압력과 멈추려고 할 때의 낮은 압력 차이와 관계없이 굴삭기 작업장치의 높은 압력에 엔진 출Regardless of the difference between the high pressure at the start and the low pressure at the stop, the engine is released at the high pressure of the excavator tool.

력이 맞추어져 있으므로 불필요한 연료의 소모가 발생되어진다Power is set, unnecessary fuel consumption occurs

<4> 이에 따라 엔진이 구동중인 상태에서 기 설정된 소정 시간(예를 들어, 5초) 동안 액셀러레이터의 입력이 발생하As a result, the accelerator input is generated for a predetermined time (for example, 5 seconds) while the engine is running.

지 않으면 자동으로 엔진의 회전수를 최저 회전수(Idle RPM)로 낮춤으로써 불필요한 연료의 소비를 방지하도록하는 기술이 제공되고 있으나, 이러한 종래의 엔진 제어 방법에서는 상술한 바와 같이 엔진 회전수 제어를 위해If not, the technology to automatically reduce the engine speed to the minimum RPM (Idle RPM) to prevent unnecessary fuel consumption is provided, but in the conventional engine control method as described above for

기 설정된 소정 시간이 차량 내부에 고정 설정되어 있기 때문에 사용자가 이를 가변 설정할 수 없는 불편함이Since the predetermined time is fixed inside the vehicle, the user may not be able to variably set it.

있으며, 엔진 회전수를 최저 회전수로 낮추더라도 엔진이 계속해서 구동되기 때문에 실질적인 연료 절감 효과가In addition, even if the engine speed is lowered to the minimum speed, the engine will continue to run, resulting in substantial fuel savings.

극히 미비하다는 문제점이 있다There is a problem that is extremely insignificant.

상술한 문제점을 해소하기 위한 본 발명의 목적은 크레인이나 굴삭기등과 <5> 같은 산업용 차량의 유압기계에 관한An object of the present invention for solving the above problems relates to a hydraulic machine of an industrial vehicle such as a crane or an excavator.

것으로 특히, 작업장치의 압력변화에 맞추어 엔진출력을 높임과 낮춤을 반복함과 동시에 유압펌프의 압력상태In particular, the pressure of the hydraulic pump is increased simultaneously with increasing and decreasing the engine output in response to the pressure change of the work equipment.

가 저압일 경우와 고압일 경우에 맞추어 엔진의 분사량을 함께 조절함으로써 전체적으로 소모되는 연료를 절약Fuel consumption is reduced by adjusting the injection volume of the engine according to low pressure and high pressure.

하기 위한 산업용 유압기기의 연료 절감 장치를 제공하는 데 있다To provide a fuel saving device for industrial hydraulic equipment for

상술한 본 발명에 따른 특징으로 인해 기대되는 효과로는, 작업장치의 압력변화에 맞추어 엔진출력을 높임과Advantageous effects due to the above-described features of the present invention are to increase the engine power according to the pressure change of the working device and

낮춤을 반복함과 동시에 유압펌프의 압력상태가 저압일 경우와 고압일 경우에 맞추어 엔진의 분사량을 함께 조At the same time, adjust the injection volume of the engine according to the low pressure and high pressure of the hydraulic pump.

절함으로써 전체적으로 소모되는 연료를 절약하게 된다Reducing saves fuel that is totally consumed

본 발명의 상술한 목적과 여러 가지 장점은 이 기술 분야에 숙련된 사람들에 의해, 첨부된 도면을 참조하여 후The above object and various advantages of the present invention will be described by those skilled in the art, with reference to the accompanying drawings.

술되는 본 발명의 바람직한 실시 예로부터 더욱 명확하게 될 것이다It will be more apparent from the preferred embodiment of the present invention to be described.

<11> 이하, 본 발명의 바람직한 실시 예를 첨부한 도면을 참조하여 상세히 설명한다Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<12> 첨부한 도 1은 본 발명에 따른 산업용 유압기기의 연료 절감 장치의 유압 및 전기회로 구성 예시도로서, 굵은1 is an exemplary view showing the configuration of an oil pressure and an electric circuit of a fuel saving device of an industrial hydraulic device according to the present invention.

실선으로 표시되는 경로는 유체(기름)의 흐름에 따른 유압회로를 나타내는 것이며, 가는 실선으로 표시되는 경The path represented by the solid line represents the hydraulic circuit according to the flow of the fluid (oil), and the path represented by the thin solid line

로는 상기 유압회로의 제어를 위한 전기회로를 나타낸다Furnace indicates an electric circuit for controlling the hydraulic circuit.

<13> 따라서 첨부한 도 1은 유압회로와 전기회로로 크게 구성되는데, 상기 유압회로는 통상의 유압회로로써 본 발명Therefore, the accompanying Figure 1 is largely composed of a hydraulic circuit and an electric circuit, the hydraulic circuit is a conventional hydraulic circuit of the present invention

의 배경기술에 해당하며, 본발명의 특징 구성은 전기회로임을 밝혀둔다본 발명에 따른 산업용 유압기기의 연료 절감 장치의 유압 및 전기회로 <14> 구성은 도 1에 도시되어 있는 바와Background Art of the Invention A characteristic configuration of the present invention reveals that an electric circuit is shown in FIG. 1.

같이, 크게 유압회로와 전기회로로 구분될 수 있는데, 유압회로는 산업용 유압기기의 연료 공급을 위한 인젝션Likewise, it can be divided into hydraulic circuit and electric circuit. The hydraulic circuit is an injection for fueling industrial hydraulic equipment.

펌프(29)의 작동을 위한 유압실린더(24)와, 상기 유압실린더(24)에 공급되어진 유체(기름)의 배출경로상에 구비It is provided on the hydraulic cylinder 24 for operating the pump 29, and the discharge path of the fluid (oil) supplied to the hydraulic cylinder 24

되어 유압실린더내의 유압을 조정하는 스로틀밸브(23)와, 상기 스로틀밸브(23)의 유체 배출경로상에 구비되어And a throttle valve 23 for adjusting the hydraulic pressure in the hydraulic cylinder and a fluid discharge path of the throttle valve 23.

있으며 해당 회수유로를 차단 또는 개방하는 릴리프밸브(22)와, 상기 유압실린더(24)로 일정압력의 유체를 공급It supplies a fluid of a constant pressure to the relief valve 22 to block or open the recovery flow path, and the hydraulic cylinder 24

하기 위한 유압펌프(25)와, 상기 유압펌프(25)에서 유압실린더(24)측으로 공급하는 유체의 전달 경로 상에 위치Hydraulic pump 25 for the purpose of, and on the delivery path of the fluid supplied from the hydraulic pump 25 to the hydraulic cylinder 24 side

하며 유체 공급 유로를 차단 또는 개방하는 솔레노이드밸브(21)로 구성된다It is composed of a solenoid valve 21 for blocking or opening the fluid supply flow path

<15> 이때 미설명 부호 26은 유압필터이며, 27과 28은 상기 유압실린더(24)의 동작을 상기 인젝션펌프(29)측에 제공In this case, reference numeral 26 is a hydraulic filter, and 27 and 28 provide an operation of the hydraulic cylinder 24 to the injection pump 29.

하기 위한 로드이며, 16은 유압호수이다16 is a hydraulic lake

<16> 또한, 참조번호 25로 지칭되는 유압펌프는 메인펌프(12)와 보조펌프(11)로 구성된다In addition, the hydraulic pump referred to by reference numeral 25 is composed of a main pump 12 and an auxiliary pump (11).

<17> 상술한 유압회로를 제어하기 위한 전기회로의 구성을 살펴보면, 전기회로의 구성요소들에 구동전원을 공급하기Looking at the configuration of the electric circuit for controlling the above-described hydraulic circuit, supplying driving power to the components of the electric circuit

위한 차량의 배터리(+B)와, 상기 메인펌프(12)의 동작에 따른 압력의 변화와 크기를 감지하는 압력센서(14)와,A pressure sensor 14 for detecting a change and a magnitude of the pressure according to the operation of the battery of the vehicle (+ B) and the main pump 12;

상기 압력센서(14)의 감지신호를 입력받아 상기 배터리(+B)에서 공급되는 전원을 분배하는 인디게이터(15)와,An indicator 15 for receiving the detection signal of the pressure sensor 14 and distributing the power supplied from the battery (+ B);

상기 인디게이터(15)에서 제공되는 전원에 의해 구동되어 상기 솔레노이드밸브(21)의 개방정도를 조절하는 릴레Reel driven by the power provided from the indicator 15 to adjust the opening degree of the solenoid valve 21

이(17)로 구성된다It consists of 17

<18> 또한, 상기 릴레이(17)에는 2개의 가변저항이 연결되어지는데, 상기 가변저항은 다이얼 방식으로 상기 릴레이In addition, two variable resistors are connected to the relay 17, and the variable resistors are dial-based.

(17)의 동작 상태에 따라 엔진 RPM을 조정하기 위한 것이다It is for adjusting the engine RPM according to the operating state of (17).

<19> 즉, 상기 릴레이(17)의 동작 상태는 압력센서(14)에서 감지되는 메인펌프(12)의 동작에 따른 압력의 변화와 크That is, the operating state of the relay 17 is the change in the pressure according to the operation of the main pump 12 sensed by the pressure sensor 14

기에 선형적으로 비례하기 때문에 상기 메인펌프(12)의 압력이 고압일 경우와 저압일 경우에 따라 엔진을 제어Since it is linearly proportional to air, the engine is controlled according to the case where the pressure of the main pump 12 is high pressure and low pressure.

하는 ECU측에 그에 따른 제어신호를 제공하는 것이다To provide the control signal according to the ECU side.

<20> 이로써, 크레인이나 굴삭기등과 같은 산업용 차량의 유압기계에서 유압펌프(25)의 압력변화에 맞추어 엔진출력Thus, the engine output according to the pressure change of the hydraulic pump 25 in the hydraulic machine of an industrial vehicle such as a crane or an excavator

을 높임과 낮춤을 반복함과 동시에 유압펌프의 압력상태가 저압일 경우와 고압일 경우에 맞추어 엔진의 분사량The amount of injection of the engine according to the case where the pressure of the hydraulic pump is low and high pressure is repeated at the same time.

을 함께 조절함으로써 전체적으로 소모되는 연료를 절약하게 되는 것이다By adjusting the energy consumption together to save the overall fuel consumption.

<21> 상기와 같이 구성되는 본 발명에 따른 산업용 유압기기의 연료 절감 장치의 동작을 살펴보면, 본 발명에서 굴삭Looking at the operation of the fuel saving device of the industrial hydraulic apparatus according to the present invention configured as described above, in the present invention excavation

기의 엔진은 작업장치의 압력이 낮을 때는 1400~1550RPM으로 하고 높은 압력에서는 굴삭기 출고 당시의 엔진 속The engine of the machine is 1400 ~ 1550RPM when the pressure of the work equipment is low and the engine speed at the time of shipment of the excavator at high pressure.

도에 근접하게 작동하도록 설정하며, 참조번호 25로 지칭되는 유압펌프는 메인펌프(12)와 보조펌프(11)로 구성It is set to operate close to the figure, the hydraulic pump referred to by reference number 25 is composed of the main pump 12 and the auxiliary pump (11)

되는데, 상기 메인펌프(12)의 동작에 따른 압력의 상태를 압력센서(14)에서 감지하게 된다The state of the pressure according to the operation of the main pump 12 is detected by the pressure sensor 14.

<22> 상기 압력센서(14)에서 감지되어진 메인펌프(12)의 압력상태에 따른 신호는 인디게이터(15)에 전달되어지는데,The signal according to the pressure state of the main pump 12 detected by the pressure sensor 14 is transmitted to the indicator 15,

상기 인디게이터(15)에 입력된 압력감지신호 즉, 상기 메인펌프(12)에서 생성되어진 압력에 대한 상기 압력센서The pressure sensor signal input to the indicator 15, that is, the pressure sensor for the pressure generated in the main pump 12

(14)의 감지신호에 따라 상기 인디게이터(15)는 릴레이(17)를 작동시키게 된다According to the detection signal of 14, the indicator 15 operates the relay 17.

<23> 이때 상기 인디게이터(15)에는 차량의 배터리 전원(+B)이 공급되고 있으므로, 상기 인디게이터(15)가 상기 릴레In this case, since the battery power (+ B) of the vehicle is supplied to the indicator 15, the indicator 15 is connected to the relay.

이(17)를 작동시킴에 따라 상기 인디게이터(15)에 공급되던 차량의 배터리 전원(+B)이 상기 릴레이(17)를 경유By operating the tooth 17, the battery power (+ B) of the vehicle supplied to the indicator 15 passes through the relay 17.

하여 솔레노이드밸브(21)에 공급되어진다Is supplied to the solenoid valve 21

<24> 따라서 상기 솔레노이드밸브(21)가 작동하게 되고, 이에 따라 상기 보조펌프(11)에서 펌핑되어지는 기름은 유압Therefore, the solenoid valve 21 is operated, so that the oil pumped from the auxiliary pump 11 is hydraulic

호수(16)를 통해 상기 솔레노이드밸브(21)를 통과한 후 유압실린더(24)로 공급되며, 상기 보조펌프(11)에서 펌After passing through the solenoid valve 21 through the lake (16) is supplied to the hydraulic cylinder (24), the pump in the auxiliary pump (11)

핑되는 정도에 따라 유압으로 작용하여 참조번호 27과 28로 지칭되는 로드(또는 케이블)를 통해 인젝션펌프(29:Depending on the degree of ping, the injection pump (29) is actuated hydraulically by means of rods (or cables) referred to by references 27 and 28.

연료 공급장치)를 작동한다Operate fuel supply)

<25> 반면에 상기 메인펌프(12)의 압력이 상기 인디게이터(15)에 입력된 압력보다 낮아지면 유압실린더(24)의 작동On the other hand, when the pressure of the main pump 12 is lower than the pressure input to the indicator 15, the operation of the hydraulic cylinder 24

역순에 의해 제자리로 돌아옴으로써 엔진 출력이 낮아진다Engine power is lowered by returning to position in reverse order

<26> 첨부한 도 1에서 미설명 구성인 참조번호 19는 상기 릴레이(17)에서 상기 솔레노이드밸브(21)측에 제공하는 작Reference numeral 19, which is not described in FIG. 1, is provided to the solenoid valve 21 side of the relay 17.

동 조절용 전원의 전달 경로를 폐쇄하거나 연결하여 자동모드 혹은 수동모드를 선택하기 위한 스위치이다It is a switch to select the automatic mode or the manual mode by closing or connecting the transmission path of the control power.

<27> 이상의 설명에서 본 발명은 특정의 실시 예와 관련하여 도시 및 설명하였지만, 특허청구범위에 의해 나타난 발In the above description, the invention has been shown and described with respect to specific embodiments, but it is indicated by the claims.

명의 사상 및 영역으로부터 벗어나지 않는 한도 내에서 다양한 개조 및 변화가 가능하다는 것을 당 업계에서Many modifications and variations are possible in the art without departing from the spirit and scope of the title.

통상의 지식을 가진 자라면 누구나 쉽게 알 수 있을 것이다Anyone with ordinary knowledge can easily know.

Claims (1)

엔진의 연료 분사량을 조절하는 ECU와, 유압기기의 연료 공급을 위한 인젝션펌프의 작동을 위한 유압실린더와,
상기 유압실린더에 공급되어진 유체(기름)의 배출경로상에 구비되어 유압실린더내의 유압을 조정하는 스로틀밸
브와, 상기 스로틀밸브의 유체 배출경로상에 구비되어 있으며 해당 회수유로를 차단 또는 개방하는 릴리프밸브
와, 상기 유압실린더로 일정압력의 유체를 공급하기 위한 유압펌프, 및 상기 유압펌프에서 유압실린더측으로 공
급하는 유체의 전달 경로 상에 위치하며 유체 공급 유로를 차단 또는 개방하는 솔레노이드밸브를 구비하는 산업
용 유압기기에 있어서:
상기 유압펌프는 메인펌프와 보조펌프로 구성하며, 보조펌프가 상기 솔레노이드밸브를 통해 유압실린더측에 일
정 압력의 유체를 공급하도록 하되;
입력되는 전압의 상태에 따라 상기 솔레노이드밸브의 개방정도를 조절하는 릴레이와;
상기 메인펌프의 동작에 따른 압력의 변화와 크기를 감지하는 압력센서와;
상기 압력센서의 감지신호를 입력받아 감지신호의 크기에 따라 선형적으로 산업용 유압기기의 내부 배터리에서
공급되는 전원을 상기 릴레이 측에 공급하는 인디게이터를 포함하는 것을 특징으로 하는 산업용 유압기기의 연
료 절감 장치ECU for controlling fuel injection amount of engine, hydraulic cylinder for operation of injection pump for fuel supply of hydraulic equipment,
Throttle ball provided on the discharge path of the fluid (oil) supplied to the hydraulic cylinder to adjust the hydraulic pressure in the hydraulic cylinder
And a relief valve provided on the fluid discharge path of the throttle valve to block or open the recovery flow path.
And a hydraulic pump for supplying a constant pressure fluid to the hydraulic cylinder, and the hydraulic pump is supplied to the hydraulic cylinder side.
An urgent is an industry with a solenoid valve located on the delivery path of the fluid and blocking or opening the fluid supply flow path.
In hydraulic equipment for:
The hydraulic pump is composed of a main pump and an auxiliary pump, and the auxiliary pump is connected to the hydraulic cylinder side through the solenoid valve.
To supply fluid at a constant pressure;
A relay for adjusting an opening degree of the solenoid valve according to a state of an input voltage;
A pressure sensor for detecting a change and a magnitude of pressure according to the operation of the main pump;
Receives the detection signal of the pressure sensor and linearly according to the magnitude of the detection signal from the internal battery of the industrial hydraulic equipment
Connecting an industrial hydraulic equipment comprising an indicator for supplying the power supplied to the relay side
Charge-saving device
KR1020180036078A 2018-03-28 2018-03-28 Oil-pressure control circuit of excavator KR20190113419A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020180036078A KR20190113419A (en) 2018-03-28 2018-03-28 Oil-pressure control circuit of excavator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020180036078A KR20190113419A (en) 2018-03-28 2018-03-28 Oil-pressure control circuit of excavator

Publications (1)

Publication Number Publication Date
KR20190113419A true KR20190113419A (en) 2019-10-08

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Family Applications (1)

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Country Status (1)

Country Link
KR (1) KR20190113419A (en)

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