KR20070047534A - Make up oil flow control device for preventing cavitation of travel moto - Google Patents

Make up oil flow control device for preventing cavitation of travel moto Download PDF

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Publication number
KR20070047534A
KR20070047534A KR1020050104382A KR20050104382A KR20070047534A KR 20070047534 A KR20070047534 A KR 20070047534A KR 1020050104382 A KR1020050104382 A KR 1020050104382A KR 20050104382 A KR20050104382 A KR 20050104382A KR 20070047534 A KR20070047534 A KR 20070047534A
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South Korea
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driving
flow rate
driving motor
valve
control
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KR1020050104382A
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Korean (ko)
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조성면
최임국
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현대중공업 주식회사
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Priority to KR1020050104382A priority Critical patent/KR20070047534A/en
Publication of KR20070047534A publication Critical patent/KR20070047534A/en

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2253—Controlling the travelling speed of vehicles, e.g. adjusting travelling speed according to implement loads, control of hydrostatic transmission
    • 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
    • E02F9/226—Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
    • 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
    • E02F9/24—Safety devices, e.g. for preventing overload
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/40—Special vehicles
    • B60Y2200/41—Construction vehicles, e.g. graders, excavators
    • B60Y2200/412—Excavators

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

Abstract

본 발명은 굴삭기 주행모터의 캐비테이션 방지를 위한 메이크업 유량조절장치에 관한 것으로, 유압컨트롤방식이 네거티브 컨트롤방식인 휠타입 굴삭기의 주행모터 유압라인으로 가는 메이크업 유량을 제어할 수 있도록 리턴체크밸브의 앞단에 위치한 네거티브컨트롤릴리프밸브에 솔레노이드밸브를 설치하여 메이크업 유량을 제어함으로써 유량부족에 따른 캐비테이션 현상을 제거해주는 굴삭기 주행모터의 캐비테이션 방지를 위한 메이크업 유량조절장치를 제공함에 있다.The present invention relates to a make-up flow control device for preventing the cavitation of the excavator driving motor, the hydraulic control method to the front end of the return check valve to control the make-up flow to the driving motor hydraulic line of the wheel type excavator of the negative control method The solenoid valve is installed in the negative control relief valve located to control the make-up flow rate, thereby providing a make-up flow control device for preventing the cavitation of the excavator driving motor that eliminates the cavitation phenomenon caused by the insufficient flow.

상기 목적달성을 위한 본 발명은 주행페달의 작동 유무에 따라 컨트롤밸브의 주행스풀라인에 압유가 공급되어 작동되는 주행스풀과, 상기 주행스풀이 작동됨에 따라 펌프의 유량을 공급받아 작동되는 주행모터와, 상기 주행페달이 미작동 되어 주행모터로의 유압공급이 일시 중지된 상태에서 메이크업리턴라인을 통해 주행모터로 유량을 보충시켜주며 네거티브컨트롤릴리프밸브에 의해 제어되는 리턴체크밸브를 포함하는 휠타입 굴삭기의 유량조절장치에 있어서, 상기 네거티브컨트롤릴리프밸브에 솔레노이드밸브를 설치하여 네거티브컨트롤릴리프밸브를 제어함으로써 주행스풀의 중립시 네거티브압을 이용하여 펌프의 토출유량을 증가시켜 모터내부의 부족한 메이크업 유량을 보충하도록 구성된 것을 그 기술적 요지로 한다.The present invention for achieving the above object is a driving spool which is operated by supplying pressure oil to the driving spool line of the control valve in accordance with the operation of the running pedal, and the driving motor which is supplied with the flow rate of the pump as the driving spool is operated The wheel type excavator includes a return check valve controlled by a negative control relief valve to supplement the flow rate to the driving motor through the make-up return line while the driving pedal is inoperative and the hydraulic supply to the driving motor is suspended. In the flow rate control device of the present invention, the solenoid valve is installed on the negative control relief valve to control the negative control relief valve to increase the discharge flow rate of the pump by using the negative pressure when the running spool is neutral to compensate for the insufficient makeup flow rate in the motor. The technical subject matter.

휠타입 굴삭기, 주행모터, 메이크업 유량, 리턴체크밸브, 네거티브 컨트롤릴리프밸브, 솔레노이드밸브, 캐비테이션 Wheel Excavator, Travel Motor, Makeup Flow, Return Check Valve, Negative Control Relief Valve, Solenoid Valve, Cavitation

Description

굴삭기 주행모터의 캐비테이션 방지를 위한 메이크업 유량조절장치{Make up oil flow control device for preventing cavitation of travel moto}Make up oil flow control device for preventing cavitation of travel moto}

도 1 은 종래의 유압컨트롤방식이 네거티브 컨트롤방식인 휠타입굴삭기의 주행장치 유압회로도,1 is a hydraulic circuit diagram of a traveling device of a wheel type excavator in which a conventional hydraulic control method is a negative control method.

도 2 는 본 발명의 유압컨트롤방식이 네거티브 컨트롤방식인 휠타입굴삭기의 주행모터 유압라인에 주행모드용 솔레노이드밸브가 장착된 유압회로도,2 is a hydraulic circuit diagram in which a solenoid valve for a driving mode is mounted on a driving motor hydraulic line of a wheel type excavator having a hydraulic control method of the present invention;

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

(10) : 주행페달 (11) : 주행스풀라인(10): Running pedal (11): Running spool line

(12) : 펌프 (13) : 컨트롤밸브(12): pump (13): control valve

(13a) : 주행스풀 (14) : 주행모터13a: driving spool 14: driving motor

(15) : 리턴체크밸브 (16) : 메이크업리턴라인(15): Return check valve (16): Makeup return line

(17) : 네거티브컨트롤릴리프밸브 (18) : 네거티브라인(17): negative control relief valve (18): negative line

(19) : 솔레노이드밸브 (20) : 유압라인(19): Solenoid valve (20): Hydraulic line

본 발명은 주행모터의 캐비테이션 방지를 위한 메이크업 유량조절장치에 관한 것으로, 보다 상세하게는 리턴체크밸브의 앞단에 위치한 네거티브컨트롤릴리프밸브에 솔레노이드밸브를 설치하여 메이크업 유량을 제어함으로써 유량부족에 따른 캐비테이션 현상을 제거해주는 굴삭기 주행모터의 캐비테이션 방지를 위한 메이크업 유량조절장치에 관한 것이다.The present invention relates to a make-up flow control device for preventing the cavitation of the driving motor, and more particularly, by installing a solenoid valve on the negative control relief valve located at the front end of the return check valve to control the make-up flow rate, the cavitation phenomenon according to the flow rate shortage. The present invention relates to a makeup flow control device for preventing cavitation of an excavator driving motor.

종래의 유압컨트롤방식이 네거티브 컨트롤방식인 휠타입굴삭기의 주행장치 유압회로도를 도 1을 통해 설명하면 다음과 같다.The hydraulic circuit diagram of a traveling device of a wheel type excavator in which a conventional hydraulic control method is a negative control method will be described with reference to FIG. 1.

주행페달(10)의 작동 유무에 따라 컨트롤밸브(13)의 주행스풀라인(11)에 압유가 공급되어 작동되는 주행스풀(13a)과, 상기 주행스풀(13a)이 작동됨에 따라 펌프(12)에서 공급되는 유량을 유압라인(20)을 통해 공급받아 작동하는 주행모터(14)와, 상기 주행페달(10)의 미작동시 주행모터(14)로의 유압공급이 일시 중지된 상태에서 메이크업리턴라인(16)을 통해 주행모터(14)로 유량을 보충시켜주며 네거티브컨트롤릴리프밸브(17)에 의해 제어되는 리턴체크밸브(15)를 포함하도록 구성된다.The driving spool 13a is operated by supplying pressure oil to the driving spool line 11 of the control valve 13 according to whether the driving pedal 10 is operated and the driving spool 13a is operated. The driving motor 14 is operated by receiving the flow rate supplied from the hydraulic line 20 and the makeup return line in a state in which the hydraulic supply to the driving motor 14 is suspended when the driving pedal 10 is not operated. It is configured to include a return check valve 15 which supplements the flow rate to the traveling motor 14 through 16 and is controlled by the negative control relief valve 17.

상기와 같이 유압컨트롤방식이 네거티브 컨트롤방식인 휠타입 굴삭기가 내리막길 주행시(Down Hill) 주행페달(10)을 작동하지 않게 되면 주행모터(14)로 공급되는 유량이 일시 차단된 상태에서 탄력을 받아 굴삭기가 내리막길을 주행하게 된다. 이때 주행모터(14) 내부의 유량이 줄어들면서 리턴체크밸브(15)에서 메이크업리턴라인(16)을 통해 메이크업 유량을 역으로 보충시킴으로써 일정량의 주행이 가 능하게 되는 이때 리턴체크밸브(15)의 셋팅압력이 일정하여 메이크업리턴라인(16)내의 유량부족으로 인한 캐비테이션이 발생할 수 있다.As described above, when the wheel type excavator of the hydraulic control method is a negative control method does not operate the downhill driving pedal 10, the flow rate supplied to the driving motor 14 is elastically received in a temporarily blocked state. The excavator will drive downhill. At this time, when the flow rate of the driving motor 14 decreases, the make-up flow rate can be reversed through the make-up return line 16 from the return check valve 15 so that a certain amount of driving is possible. Since the pressure is constant, cavitation may occur due to the lack of flow rate in the makeup return line 16.

상기와 같이 캐비테이션이 발생하게 되면 주행모터(14)의 소음은 물론 내구수명에도 악영향을 주며 내리막길 주행시 운전자 승차감 저하로 운전자의 피로가 유발되는 문제점이 있다.When cavitation occurs as described above, there is a problem that the noise of the driving motor 14 is adversely affected as well as the endurance life, and the driver's fatigue is caused by the driver's riding comfort when driving downhill.

본 발명은 상기와 같은 종래의 문제점을 해결하기 위하여 창출되는 것으로, 유압컨트롤방식이 네거티브 컨트롤방식인 휠타입 굴삭기의 주행모터 유압라인으로 가는 메이크업 유량을 제어할 수 있도록 리턴체크밸브의 앞단에 위치한 네거티브컨트롤릴리프밸브에 솔레노이드밸브를 설치하여 메이크업 유량을 제어함으로써 유량부족에 따른 캐비테이션 현상을 제거해주는 굴삭기 주행모터의 캐비테이션 방지를 위한 메이크업 유량조절장치를 제공함을 목적으로 한다.The present invention is created to solve the above conventional problems, the negative control located in the front end of the return check valve to control the make-up flow to the traveling motor hydraulic line of the wheel type excavator of the hydraulic control method is a negative control method It is an object of the present invention to provide a make-up flow control device for preventing cavitation of an excavator driving motor that eliminates cavitation caused by insufficient flow by installing a solenoid valve on a control relief valve.

상기 목적을 달성하기 위한 본 발명은 주행페달의 작동 유무에 따라 컨트롤밸브의 주행스풀라인에 압유가 공급되어 작동되는 주행스풀과, 상기 주행스풀이 작동됨에 따라 펌프의 유량을 공급받아 작동되는 주행모터와, 상기 주행페달이 미작동 되어 주행모터로의 유압공급이 일시 중지된 상태에서 메이크업리턴라인을 통해 주행모터로 유량을 보충시켜주며 네거티브컨트롤릴리프밸브에 의해 제어되는 리턴 체크밸브를 포함하는 휠타입 굴삭기의 유량조절장치에 있어서, 상기 네거티브컨트롤릴리프밸브에 솔레노이드밸브를 설치하여 네거티브컨트롤릴리프밸브를 제어함으로써 주행스풀의 중립시 네거티브압을 이용하여 펌프의 토출유량을 증가시켜 모터내부의 부족한 메이크업 유량을 보충하도록 구성된 것을 특징으로 한다.The present invention for achieving the above object is a driving spool in which the hydraulic oil is supplied to the driving spool line of the control valve in accordance with the operation of the running pedal and the driving motor supplied with the flow rate of the pump as the driving spool is operated And a wheel type including a return check valve controlled by a negative control relief valve to supplement the flow rate to the driving motor through the make-up return line in a state in which the driving pedal is inoperative and the hydraulic supply to the driving motor is suspended. In the excavator flow control device, the negative control relief valve is provided with a solenoid valve to control the negative control relief valve to increase the discharge flow rate of the pump by using the negative pressure when the running spool is neutral to reduce the insufficient makeup flow rate inside the motor. And configured to supplement.

이하 본 발명의 실시예인 구성과 그 작용을 첨부도면에 연계시켜 상세히 설명하면 다음과 같다.Hereinafter, the configuration and the operation of the embodiment of the present invention will be described in detail with reference to the accompanying drawings.

도 2 는 본 발명의 주행모터 유압라인에 주행모드용 솔레노이드밸브가 장착된 유량조절장치의 유압회로도로서, 2 is a hydraulic circuit diagram of a flow control device equipped with a solenoid valve for driving mode in a traveling motor hydraulic line of the present invention.

본 발명은 유압컨트롤 방식이 네거티브 컨트롤 방식인 휠타입 굴삭기의 유량조절장치에 관한 것으로, 유량조절장치는 주행페달(10)과, 상기 주행페달(10)과 주행스풀라인(11)을 통해 연결되어 압유가 공급되어 주행스풀(13a)을 작동시키도록 하는 컨트롤밸브(13)와, 상기 주행스풀(13a)의 작동에 따라 주행모터(14)로 유압라인(20)을 통해 유압을 공급해주는 펌프(12)와, 상기 주행페달(10)의 미작동 시 주행모터(14)로의 유압공급이 일시 중지된 상태에서 메이크업리턴라인(16)을 통해 주행모터(14)로 유량을 보충시켜주며 네거티브컨트롤릴리프밸브(17)에 의해 제어되는 리턴체크밸브(15)와, 상기 네거티브컨트롤릴리프밸브(17)에 연결되도록 설치되어 네거티브컨트롤릴리프밸브(17)를 제어하는 솔레노이드밸브(19)를 포함하여 구성된다.The present invention relates to a flow control device of a wheel type excavator in which the hydraulic control method is a negative control method, and the flow control device is connected through the travel pedal 10, the travel pedal 10, and the travel spool line 11. A control valve 13 for supplying pressure oil to operate the driving spool 13a, and a pump for supplying hydraulic pressure through the hydraulic line 20 to the driving motor 14 according to the operation of the driving spool 13a ( 12) and the negative control relief is made by supplementing the flow rate to the driving motor 14 through the makeup return line 16 in a state in which the hydraulic supply to the driving motor 14 is paused when the driving pedal 10 is not operated. A return check valve 15 controlled by the valve 17 and a solenoid valve 19 installed to be connected to the negative control relief valve 17 to control the negative control relief valve 17 is configured.

상기와 같은 구조의 유량조절장치의 유압회로의 동작을 살펴보면, 먼저 굴삭 기를 주행시키기 위해 주행페달(10)을 밟게 되면 주행스풀라인(11)을 통해 압유가 컨트롤밸브(13)로 공급되어 주행스풀(13a)을 작동시킴에 따라 펌프(12)에서 유압라인(20)을 통해 압유를 주행모터(14)로 공급하여 주행모터(14)가 작동하게 된다.Looking at the operation of the hydraulic circuit of the flow regulating device of the structure as described above, first press the running pedal 10 to drive the excavator, the pressure oil is supplied to the control valve 13 through the driving spool line (11) driving spool By operating the 13a, the pump 12 supplies the hydraulic oil through the hydraulic line 20 to the driving motor 14 so that the driving motor 14 operates.

이와 같이 작동되는 휠타입 굴삭기가 내리막길을 주행하게 되면 운전자는 속도조절을 위하여 주행페달(10)을 밟지 않게 되고, 주행페달(10)을 밟지 않음으로써 주행스풀(13a)이 중립이 되어 주행모터(14) 내부로 유량공급이 되지 않게 되어 주행모터(14) 내부의 유량이 줄어들게 된다. 이렇게 주행모터(14) 내부로의 유량공급이 중단되면 메이크업리턴라인(16)을 통해 주행모터(14)로 압유가 공급되나 주행페달(10)의 미작동 시간이 길어지게 되면 리턴체크밸브(15)의 셋팅압력이 일정하여 메이크업리턴라인(16)을 통해 보충되는 유량이 부족해져 캐비테이션 현상이 발생하게 된다.When the wheel type excavator operated in this way travels downhill, the driver does not step on the driving pedal 10 for speed control, and the driving spool 13a becomes neutral by not stepping on the driving pedal 10 so that the driving motor 14, the flow rate is not supplied to the inside, so the flow rate inside the traveling motor 14 is reduced. When the flow rate supply to the inside of the driving motor 14 is stopped, the hydraulic oil is supplied to the driving motor 14 through the make-up return line 16, but when the inactive time of the driving pedal 10 becomes long, the return check valve 15 ), The set pressure is constant, so that the flow rate to be replenished through the makeup return line 16 is insufficient, the cavitation phenomenon occurs.

이때 상기 솔레노이드밸브(19)가 'on' 이 되면 네거티브컨트롤릴리프밸브(17)를 작동시킴으로 펌프(12)로부터 리턴되는 유압은 네거티브압 이하로 떨어지게 되고 그 낮은 압력은 네거티브라인(18)을 통해 펌프(12)의 유량을 증가시킴으로써 주행모터(14)의 부족한 메이크업 유량을 보충하게 된다.In this case, when the solenoid valve 19 is 'on', the negative control relief valve 17 is operated so that the hydraulic pressure returned from the pump 12 falls below the negative pressure and the low pressure is pumped through the negative line 18. By increasing the flow rate of (12), the makeup makeup flow rate of the traveling motor 14 is compensated for.

상기와 같이 솔레노이드밸브(19)를 이용하여 네거티브컨트롤릴리프밸브(17)를 제어함으로 주행모터(14) 내부의 부족한 메이크업 유량을 보충시킬 수 있어 상황에 따라 발생되는 메이크업 유량부족 현상을 방지하게 된다.As described above, by controlling the negative control relief valve 17 using the solenoid valve 19, the makeup flow rate that is insufficient in the driving motor 14 may be compensated for, thereby preventing the makeup flow shortage phenomenon caused by the situation.

본 발명은 상술한 특정의 바람직한 실시예에 한정되지 아니하며, 청구범위에 서 청구하는 본 발명의 요지를 벗어남이 없이 당해 발명이 속하는 기술분야에서 통상의 지식을 가진 자라면 누구든지 다양한 변형실시가 가능한 것은 물론이고, 그와 같은 변경은 청구범위 기재의 범위 내에 있게 된다.The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

상기와 같은 구성 및 작용에 의해 기대할 수 있는 본 발명의 효과는, 유압컨트롤방식이 네거티브컨트롤 방식인 휠타입 굴삭기의 주행장치에 있어, 내리막길 주행시 주행모터라인으로 가는 메이크업 유량을 제어하기 위해 주행모드용 솔레노이드밸브를 장착하여 네거티브컨트롤릴리프밸브를 제어함으로써 주행모터 내부의 부족한 메이크업 유량을 쉽게 보충시켜 줌에 따라, 주행모터의 메이크업 유량부족 현상에 따라 발생되는 캐비테이션을 제거하고 주행모터의 소음을 방지할 수 있으며 주행모터 내구 수명 증대 및 운전자의 승차감이 상승되도록 하는 매우 유용한 발명이다.The effect of the present invention can be expected by the configuration and action as described above, in the traveling device of the wheel type excavator, the hydraulic control method is a negative control method, driving mode to control the make-up flow to the traveling motor line when driving downhill By installing a solenoid valve for controlling the negative control relief valve, it is possible to easily compensate for insufficient makeup flow in the driving motor, thereby eliminating cavitation caused by the lack of makeup flow in the driving motor and preventing noise of the driving motor. It is a very useful invention that can increase the driving motor endurance life and the driver's riding comfort.

Claims (1)

주행페달의 작동 유무에 따라 컨트롤밸브의 주행스풀라인에 압유가 공급되어 작동되는 주행스풀과, 상기 주행스풀이 작동됨에 따라 펌프의 유량을 공급받아 작동되는 주행모터와, 상기 주행페달이 미작동 되어 주행모터로의 유압공급이 일시 중지된 상태에서 메이크업리턴라인을 통해 주행모터로 유량을 보충시켜주며 네거티브컨트롤릴리프밸브에 의해 제어되는 리턴체크밸브를 포함하는 휠타입 굴삭기의 유량조절장치에 있어서,The driving spool is operated by supplying pressure oil to the driving spool line of the control valve according to the operation of the driving pedal, the driving motor operated by receiving the flow rate of the pump as the driving spool is operated, and the driving pedal is not operated. In the flow control device of the wheel type excavator including a return check valve controlled by a negative control relief valve to supplement the flow rate to the traveling motor through the make-up return line in the state that the hydraulic supply to the traveling motor is paused, 상기 네거티브컨트롤릴리프밸브에 솔레노이드밸브를 설치하여 네거티브컨트롤릴리프밸브를 제어함으로써 주행스풀의 중립시 네거티브압을 이용하여 펌프의 토출유량을 증가시켜 모터내부의 부족한 메이크업 유량을 보충하도록 구성된 굴삭기 주행모터의 캐비테이션 방지를 위한 메이크업 유량조절장치.By installing a solenoid valve on the negative control relief valve to control the negative control relief valve, the cavitation of the excavator driving motor configured to supplement the insufficient makeup flow rate in the motor by increasing the discharge flow rate of the pump by using the negative pressure when the driving spool is neutral. Makeup flow regulator for prevention.
KR1020050104382A 2005-11-02 2005-11-02 Make up oil flow control device for preventing cavitation of travel moto KR20070047534A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110050113A (en) * 2016-12-16 2019-07-23 卡特彼勒公司 Fan control system with the electro-hydraulic valve for providing three fan motor operating positions
CN114869040A (en) * 2022-06-20 2022-08-09 广东工业大学 One-armed make-up auxiliary device for people

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110050113A (en) * 2016-12-16 2019-07-23 卡特彼勒公司 Fan control system with the electro-hydraulic valve for providing three fan motor operating positions
CN110050113B (en) * 2016-12-16 2021-12-07 卡特彼勒公司 Fan control system having electro-hydraulic valve providing three fan motor operating positions
CN114869040A (en) * 2022-06-20 2022-08-09 广东工业大学 One-armed make-up auxiliary device for people
CN114869040B (en) * 2022-06-20 2023-03-24 广东工业大学 One-armed make-up auxiliary device for people

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