KR101356008B1 - prevention device overspeed travel motor of crawler excavator - Google Patents

prevention device overspeed travel motor of crawler excavator Download PDF

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KR101356008B1
KR101356008B1 KR1020070053645A KR20070053645A KR101356008B1 KR 101356008 B1 KR101356008 B1 KR 101356008B1 KR 1020070053645 A KR1020070053645 A KR 1020070053645A KR 20070053645 A KR20070053645 A KR 20070053645A KR 101356008 B1 KR101356008 B1 KR 101356008B1
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South Korea
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speed
traveling
valve
hydraulic
working
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KR1020070053645A
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Korean (ko)
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KR20080105709A (en
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이경섭
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볼보 컨스트럭션 이큅먼트 에이비
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/226—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
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2232—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2267—Valves or distributors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/40—Special vehicles
    • B60Y2200/41—Construction vehicles, e.g. graders, excavators
    • B60Y2200/412—Excavators

Abstract

개시된 내용은, 크롤러식 굴삭기의 좌,우측 주행장치와 아암 등의 작업장치를 동시에 구동시키는 작업모드시, 아암 등의 작업장치에 발생되는 부하압력에 따라 과다하게 공급되는 작동유에 의해 주행모터가 과속으로 인해 파손되는 것을 방지할 수 있도록한 것으로,The disclosure discloses that when the work mode for simultaneously driving the left and right traveling devices of the crawler type excavator and the working devices such as the arms, the traveling motor is overspeeded by the hydraulic oil supplied excessively according to the load pressure generated by the working devices such as the arms. To prevent damage caused by

본 발명의 실시예에 의한 크롤러식 굴삭기의 주행모터 과속 방지장치는, 가변용량형 제1,2유압펌프와,An apparatus for preventing a traveling motor of a crawler excavator according to an embodiment of the present invention includes a variable displacement first and second hydraulic pumps,

제1유압펌프에 연결되는 좌측 주행모터 및 작업장치와,A left driving motor and a work device connected to the first hydraulic pump;

제2유압펌프에 연결되는 우측 주행모터 및 작업장치와,A right traveling motor and a work device connected to the second hydraulic pump;

제1,2유압펌프로부터 좌측,우측 주행모터 및 작업장치에 각각 공급되는 작동유를 제어하는 절환밸브를 포함하는 콘트롤밸브와,A control valve including a switching valve for controlling hydraulic fluid supplied from the first and second hydraulic pumps to the left and right traveling motors and the work device, respectively;

제1,2유압펌프의 센터바이패스통로 상류측에서 병렬연결된 관로에 설치되며, 주행장치와 작업장치를 동시에 구동시키는 작업모드시 신호압 공급으로 절환되어 장비의 주행직진성을 확보하는 주행직진밸브와,It is installed in the pipeline connected upstream of the center bypass passage of the 1st and 2nd hydraulic pump, and it is installed with the traveling straight valve which switches the signal pressure supply in the working mode to drive the traveling device and the working device at the same time and ensures the straightness of the equipment. ,

신호압 공급으로 절환시 좌측 및 우측 주행모터의 사판경전각을 각각 제어하는 속도조절밸브와,A speed control valve for controlling the swash plate tilt angle of the left and right driving motors when switching to a signal pressure supply;

사용자에 의한 조작으로 절환되어 속도조절밸브를 절환시키도록 제어신호를 출력하는 주행 1속/2속절환밸브와,A traveling 1 speed / 2 speed switching valve for switching over by a user and outputting a control signal to switch the speed regulating valve;

주행 1속/2속절환밸브와 속도조절밸브사이에 설치되고, 주행장치와 작업장치 를 동시에 구동시키는 작업모드시 작업장치에 발생되는 부하압력에 따라 속도조절밸브에 공급되는 제어신호를 단속하는 과속방지용 로직밸브를 포함한다.It is installed between the driving 1 speed / 2 speed switching valve and the speed control valve, and overspeed to control the control signal supplied to the speed control valve according to the load pressure generated in the working device in the work mode to drive the traveling device and the working device at the same time. Includes a preventive logic valve.

크롤러식 굴삭기, 주행모터, 과속 방지장치 Crawler Excavators, Travel Motors, Speed Limiters

Description

크롤러식 굴삭기의 주행모터 과속 방지장치{prevention device overspeed travel motor of crawler excavator}Prevention device overspeed travel motor of crawler excavator

도 1은 종래 기술에 의한 크롤러식 굴삭기의 주행장치의 개략적인 유압회로도,1 is a schematic hydraulic circuit diagram of a traveling device of a crawler excavator according to the prior art;

도 2는 본 발명의 실시예에 의한 크롤러식 굴삭기의 주행모터 과속 방지장치의 유압회로도이다.2 is a hydraulic circuit diagram of a traveling motor overspeed prevention apparatus of a crawler excavator according to an embodiment of the present invention.

*도면중 주요 부분에 사용된 부호의 설명Description of reference numerals used in the main parts of the drawings

1; 제1유압펌프One; 1st hydraulic pump

2; 제2유압펌프2; 2nd hydraulic pump

3; 좌측 주행모터3; Left motor

4,6; 작업장치4,6; Working device

5; 우측 주행모터5; Right driving motor

7,8; 주행모터용 절환밸브7,8; Selector Valve for Travel Motor

9; 관로9; pipeline

10; 주행직진밸브10; Travel straight valve

11,12; 유량감지밸브11,12; Flow detection valve

13,14; 속도조절밸브13,14; Speed control valve

15; 주행 1속/2속절환밸브15; Travel 1 speed / 2 speed switching valve

16; 과속방지용 로직밸브16; Overspeed prevention logic valve

21; 콘트롤밸브21; Control valve

본 발명은 크롤러식 굴삭기의 좌,우측 주행장치와 아암 등의 작업장치를 동시에 구동시키는 작업모드시 주행모터의 과속되는 것을 방지할 수 있도록한 크롤러식 굴삭기의 주행모터 과속 방지장치에 관한것이다.The present invention relates to a traveling motor overspeed preventing device of a crawler type excavator that can prevent the traveling motor from being overspeed in a work mode for simultaneously driving a left and right traveling device of a crawler type excavator and a work device such as an arm.

더욱 상세하게는, 주행장치와 작업장치를 동시에 구동시키는 작업모드시, 아암 등의 작업장치에 발생되는 부하압력에 따라 과다하게 공급되는 작동유에 의해 주행모터가 과속으로 인해 파손되는 것을 방지할 수 있도록한 크롤러식 굴삭기의 주행모터 과속 방지장치에 관한 것이다.More specifically, in the working mode of simultaneously driving the traveling device and the working device, the traveling motor can be prevented from being damaged due to the overspeed by the hydraulic oil supplied excessively according to the load pressure generated in the working device such as the arm. The present invention relates to a traveling motor overspeed prevention device of a crawler excavator.

일반적인 크롤러식 굴삭기는 휠타입 굴삭기에 비해 접지면적이 크고 접지압력이 작아 주로 사지 또는 습지에서의 작업이 용이한 이점을 갖는다. 반면에 기동력이 약 2.5∼3.5㎞/h정도이므로 장거리 이동이 곤란하여 트레일러 등의 차량에 탑재하여 작업장소로 이동하게 된다.In general, crawler excavators have a large ground area and a low ground pressure, compared to wheel type excavators. On the other hand, since the maneuverability is about 2.5-3.5 km / h, it is difficult to move long distances, so it is mounted on a vehicle such as a trailer and moved to a work place.

도 1에 도시된 바와 같이, 종래 기술에 의한 크롤러식 굴삭기의 주행장치는, 가변용량형 제1,2유압펌프(1,2)와,As shown in Figure 1, the traveling device of the crawler excavator according to the prior art, the variable displacement first and second hydraulic pumps (1, 2),

제1유압펌프(1)에 연결되는 좌측 주행모터(3) 및 작업장치(4)(버킷실린더 등)와,The left traveling motor 3 and the work device 4 (bucket cylinder, etc.) connected to the first hydraulic pump 1,

제2유압펌프(2)에 연결되는 우측 주행모터(5) 및 작업장치(6)(아암실린더 등)와,The right traveling motor 5 and the work device 6 (arm cylinder, etc.) connected to the second hydraulic pump 2,

제1,2유압펌프(1,2)로부터 좌측 및 우측 주행모터(3,5) 및 작업장치(4,6)에 공급되는 작동유를 각각 제어하는 콘트롤밸브(21)와,A control valve 21 for controlling hydraulic oil supplied from the first and second hydraulic pumps 1 and 2 to the left and right traveling motors 3 and 5 and the work device 4 and 6, respectively;

제1유압펌프(1)와 좌측 주행모터(3)사이의 관로와, 제2유압펌프(2)와 우측 주행모터(5)사이의 관로에 각각 설치되는 주행모터용 절환밸브(7,8)와,Switching valves for traveling motors (7, 8) respectively provided in the conduit between the first hydraulic pump (1) and the left traveling motor (3) and the conduit between the second hydraulic pump (2) and the right traveling motor (5). Wow,

제1유압펌프(1)와 작업장치(4)사이의 관로와, 제2유압펌프(2)와 작업장치(6)사이의 관로에 각각 설치되는 작업장치용 절환밸브(17,18)와,Switch valves 17 and 18 for the work device respectively installed in the conduit between the first hydraulic pump 1 and the work device 4, the conduit between the second hydraulic pump 2 and the work device 6;

제1,2유압펌프(1,2)의 센터바이패스통로의 상류측에서 병렬연결된 관로(9)에 설치되며, 신호압 공급으로 절환시 장비의 주행 직진성을 확보하는 주행 직진밸브(10)와,It is installed in the pipeline 9 connected in parallel in the upstream side of the center bypass passage of the first and second hydraulic pumps (1, 2), and the traveling straight valve (10) to ensure the traveling straightness of the equipment when switching to the signal pressure supply and ,

사용자에 의한 스위치(20)의 조작으로 인해 외부로부터 신호압 공급으로 절환시 좌,우측 주행모터(3,5)의 사판 경전각을 각각 제어하는 속도조절밸브(13,14)를 포함한다.It includes a speed control valve (13, 14) for controlling the swash plate tilt angle of the left and right driving motors (3, 5) when switching to the supply of signal pressure from the outside due to the operation of the switch 20 by the user.

종래 기술에 의한 굴삭기의 주행장치에서는, 장비의 주행모드일 경우에는 제1유압펌프(1)로부터의 작동유는 좌측 주행모터(3)에 공급되고, 제2유압펌프(2)로부터의 작동유는 우측 주행모터(5)에 공급된다.In the traveling device of an excavator according to the prior art, in the traveling mode of the equipment, the hydraulic oil from the first hydraulic pump 1 is supplied to the left traveling motor 3, and the hydraulic oil from the second hydraulic pump 2 is right. It is supplied to the traveling motor 5.

한편, 주행장치와 작업장치(아암실린더 등)를 동시에 구동시키는 작업모드시 신호압 공급으로 인해 주행직진밸브(10)가 도면상, 좌측방향으로 절환된다. 제1,2유압펌프(1,2)로부터의 작동유는 작업장치(4,6)에 우선적으로 공급되고, 잉여 작동유는 상대측 유압펌프의 유량과 합류되어 좌,우측 주행모터(3,5)에 균등하게 분배공급되므로, 장비의 주행직진성이 확보된다.On the other hand, the traveling straight valve 10 is switched to the left in the drawing due to the signal pressure supply in the working mode for simultaneously driving the traveling device and the working device (arm cylinder, etc.). The hydraulic oil from the first and second hydraulic pumps 1 and 2 is preferentially supplied to the working apparatuses 4 and 6, and the surplus hydraulic oil is joined with the flow rates of the counter hydraulic pumps to the left and right traveling motors 3 and 5. Since it is distributed evenly, the driving straightness of the equipment is secured.

주행시 크롤러식 하부주행체의 좌측 주행트랙이 지면으로부터 이격되는 상태이고, 우측 주행트랙이 지면에 접촉되는 잭엎(jack up)된 상태에서, 좌측 주행모터(3)를 구동시키는 경우, 좌측 주행모터(3)의 회전수는 제1유압펌프(1)의 제어된 유량에 따라 결정된다.When driving the left traveling motor 3 in a state where the left traveling track of the crawler type lower traveling body is spaced apart from the ground and the right traveling track is jacked up in contact with the ground, the left traveling motor ( The rotation speed of 3) is determined according to the controlled flow rate of the first hydraulic pump 1.

한편, 주행중 작업장치(6)를 구동시키는 경우 주행직진밸브(10)의 절환으로 인해 제1,2유압펌프(1,2)로부터 토출되는 유량은 합류된다. 이때 작업장치(6)에 발생되는 부하압력이 우측 주행모터(5)에 발생되는 부하압력보다 상대적으로 높은 경우, 주행직진밸브(10)에 의해 제1,2유압펌프(1,2)로부터의 합류된 작동유는 좌측 주행모터(3)에 공급되므로 좌측 주행모터(3)의 회전속도는 유량에 비례하여 증가한다.On the other hand, when driving the work device 6 while driving due to the switching of the traveling straight valve 10, the flow rate discharged from the first and second hydraulic pump (1, 2) is joined. At this time, when the load pressure generated in the work device 6 is relatively higher than the load pressure generated in the right traveling motor 5, the traveling straight valve 10 causes the pressure from the first and second hydraulic pumps 1 and 2 to be reduced. Since the joined hydraulic oil is supplied to the left traveling motor 3, the rotation speed of the left traveling motor 3 increases in proportion to the flow rate.

사용자에 의해 스위치(20)를 조작시, 외부로부터의 신호압에 의해 속도조절밸브(13,14)가 각각 절환되므로, 좌우측 주행모터(3,5)의 사판 경전각을 각각 작게 하여 좌측 주행모터(3)는 2속으로 변환된다When the switch 20 is operated by the user, the speed control valves 13 and 14 are respectively switched by the signal pressure from the outside, so that the swash plate tilt angles of the left and right traveling motors 3 and 5 are respectively reduced to the left driving motor. (3) is converted to second speed

한편, 작업장치(6)가 릴리프상태이거나 또는 그 구동속도가 느린상태로 변환되는 경우, 좌측 주행모터(3)는 주행 2속상태이고, 주행직진밸브(10)에 의해 합류되는 제1,2유압펌프(1,2)로부터의 작동유가 공급되므로, 좌측 주행모터(3)의 회전속도는 설정된 회전속도 상한치를 초과하게 된다.On the other hand, when the work device 6 is in the relief state or the drive speed is changed to the state in which the driving speed is slow, the left traveling motor 3 is the traveling second speed state and the first and second joined by the traveling straight valve 10. Since the hydraulic oil from the hydraulic pumps 1 and 2 is supplied, the rotational speed of the left traveling motor 3 exceeds the set upper limit of the rotational speed.

즉, 주행장치와 작업장치를 동시에 구동시키는 작업모드시, 작업조건에 따라 주행모터(3)의 회전속도가 설정값을 초과하는 경우가 지속되거나 또는 이러한 작업조건의 빈도가 많아지는 경우, 과속으로 인해 주행모터(3)가 파손되거나 사용수명이 단축되는 문제점을 갖는다.That is, in the work mode for simultaneously driving the traveling device and the working device, if the rotational speed of the traveling motor 3 exceeds the set value according to the working condition or if the frequency of these working conditions increases, Due to this, the driving motor 3 is damaged or its service life is shortened.

본 발명의 실시예는, 주행장치와 작업장치를 동시에 구동시키는 작업모드시, 작업장치에 발생되는 부하압력에 따라 주행모터가 과속으로 인해 파손되는 것을 방지할 수 있도록한 크롤러식 굴삭기의 주행모터 과속 방지장치와 관련된다.In an embodiment of the present invention, the traveling motor overspeed of a crawler-type excavator to prevent the traveling motor from being damaged due to the overspeed in accordance with the load pressure generated in the working device in the work mode for driving the traveling device and the work device at the same time Related to prevention devices.

본 발명의 실시예에 의한 크롤러식 굴삭기의 주행모터 과속 방지장치는, 가변용량형 제1,2유압펌프와,An apparatus for preventing a traveling motor of a crawler excavator according to an embodiment of the present invention includes a variable displacement first and second hydraulic pumps,

제1유압펌프에 연결되는 좌측 주행모터 및 작업장치와,A left driving motor and a work device connected to the first hydraulic pump;

제2유압펌프에 연결되는 우측 주행모터 및 작업장치와,A right traveling motor and a work device connected to the second hydraulic pump;

제1,2유압펌프로부터 좌측,우측 주행모터 및 작업장치에 각각 공급되는 작동유를 제어하는 절환밸브를 포함하는 콘트롤밸브와,A control valve including a switching valve for controlling hydraulic fluid supplied from the first and second hydraulic pumps to the left and right traveling motors and the work device, respectively;

제1,2유압펌프의 센터바이패스통로 상류측에서 병렬연결된 관로에 설치되며, 주행장치와 작업장치를 동시에 구동시키는 작업모드시 신호압 공급으로 절환되어 장비의 주행직진성을 확보하는 주행직진밸브와,It is installed in the pipeline connected upstream of the center bypass passage of the 1st and 2nd hydraulic pump, and it is installed with the traveling straight valve which switches the signal pressure supply in the working mode to drive the traveling device and the working device at the same time and ensures the straightness of the equipment. ,

신호압 공급으로 절환시 좌측 및 우측 주행모터의 사판경전각을 각각 제어하는 속도조절밸브와,A speed control valve for controlling the swash plate tilt angle of the left and right driving motors when switching to a signal pressure supply;

사용자에 의한 조작으로 절환되어 속도조절밸브를 절환시키도록 제어신호를 출력하는 주행 1속/2속절환밸브와,A traveling 1 speed / 2 speed switching valve for switching over by a user and outputting a control signal to switch the speed regulating valve;

주행 1속/2속절환밸브와 속도조절밸브사이에 설치되고, 주행장치와 작업장치를 동시에 구동시키는 작업모드시 작업장치에 발생되는 부하압력에 따라 속도조절밸브에 공급되는 제어신호를 단속하는 과속방지용 로직밸브를 포함한다.It is installed between the driving 1 speed / 2 speed switching valve and the speed control valve, and overspeed to control the control signal supplied to the speed control valve according to the load pressure generated in the working device in the work mode for driving the traveling device and the working device at the same time. Includes a preventive logic valve.

바람직한 실시예에 의하면, 전술한 제1,2유압펌프의 센터바이패스통로의 하류측에 각각 설치되고, 검출되는 작동압이 설정값보다 작은 경우 과속방지용 로직밸브의 닫힌상태를 유지하고, 검출되는 작동압이 설정값보다 큰 경우 과속방지용 로직밸브를 개방시키도록 작동압을 신호압력으로서 출력하는 유량감지밸브를 더 포함한다.According to a preferred embodiment, each of the above-described first and second hydraulic pumps is installed downstream of the center bypass passage, and when the detected operating pressure is smaller than the set value, the closed state of the speed preventing logic valve is maintained and detected. If the operating pressure is greater than the set value further includes a flow rate detection valve for outputting the operating pressure as a signal pressure to open the logic valve for preventing overspeed.

이하, 본 발명의 바람직한 실시예를 첨부된 도면을 참조하여 설명하되, 이는 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 발명을 용이하게 실시할 수 있을 정도로 상세하게 설명하기 위한 것이지, 이로 인해 본 발명의 기술적인 사상 및 범주가 한정되는 것을 의미하지는 않는 것이다.Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, which are intended to describe in detail enough to enable those skilled in the art to easily practice the invention, and therefore It does not mean that the technical spirit and scope of the present invention is limited.

도 2에 도시된 바와 같이, 본 발명의 실시예에 의한 크롤러식 굴삭기의 주행모터 과속 방지장치는, 가변용량형 제1,2유압펌프(1,2)와,As shown in FIG. 2, the apparatus for preventing a traveling motor of a crawler excavator according to an embodiment of the present invention includes a variable displacement first and second hydraulic pumps 1 and 2, and

제1유압펌프(1)에 연결되는 좌측 주행모터(3) 및 작업장치(4)(버킷실린더 등)와,The left traveling motor 3 and the work device 4 (bucket cylinder, etc.) connected to the first hydraulic pump 1,

제2유압펌프(2)에 연결되는 우측 주행모터(5) 및 작업장치(6)(아암실린더 등)와,The right traveling motor 5 and the work device 6 (arm cylinder, etc.) connected to the second hydraulic pump 2,

제1,2유압펌프(1,2)로부터 좌측,우측 주행모터(3,5) 및 작업장치(4,6)에 각각 공급되는 작동유를 제어하는 절환밸브(7,8)(17,18)를 포함하는 콘트롤밸브(21)와,Switching valves (7, 8) (17, 18) for controlling the hydraulic oil supplied from the first and second hydraulic pumps (1, 2) to the left and right traveling motors (3, 5) and the working devices (4, 6), respectively. And a control valve 21 including:

제1,2유압펌프(1,2)의 센터바이패스통로 상류측에서 병렬연결된 관로(9)에 설치되며, 주행장치와 작업장치를 동시에 구동시키는 작업모드시 신호압 공급으로 절환되어 장비의 주행직진성을 확보하는 주행직진밸브(10)와,It is installed in the pipeline 9 connected in parallel at the upstream side of the center bypass passage of the first and second hydraulic pumps 1 and 2, and is switched to the signal pressure supply in the working mode to drive the traveling device and the working device at the same time, and to drive the equipment. Running straight valve 10 to ensure the straightness,

신호압 공급으로 절환시 좌측 및 우측 주행모터(3,5)의 사판경전각을 각각 제어하는 속도조절밸브(13,14)와,Speed control valves 13 and 14 for controlling the swash plate tilt angles of the left and right traveling motors 3 and 5, respectively, when switching to a signal pressure supply;

사용자에 의한 조작으로 절환되어 속도조절밸브(13,14)를 절환시키도록 제어신호를 출력하는 주행 1속/2속절환밸브(15)와,A traveling 1 speed / 2 speed switching valve 15 which is switched by an operation by a user and outputs a control signal to switch the speed regulating valves 13 and 14,

주행 1속/2속절환밸브(15)와 속도조절밸브(13,14)사이에 설치되고, 주행모 터(3,5)와 작업장치(4,6)를 동시에 구동시키는 작업모드시 작업장치(4,6)에 발생되는 부하압력에 따라 속도조절밸브(13,14)에 공급되는 제어신호를 단속하는 과속방지용 로직밸브(16)를 포함한다.Work device in the work mode installed between the traveling 1 speed / 2 speed switching valve 15 and the speed control valves 13 and 14 and simultaneously driving the driving motors 3 and 5 and the working device 4 and 6. And an overspeed prevention logic valve 16 for intermittently controlling the control signal supplied to the speed regulating valves 13 and 14 according to the load pressure generated at (4, 6).

제1,2유압펌프(1,2)의 센터바이패스통로의 하류측에 각각 설치되고, 검출되는 작동압이 설정값보다 작은 경우 과속방지용 로직밸브(16)의 닫힌상태를 유지하고, 검출되는 작동압이 설정값보다 큰 경우 과속방지용 로직밸브(16)를 개방시키도록 작동압을 신호압력으로서 출력하는 유량감지밸브(11,12)를 더 포함한다.It is provided on the downstream side of the center bypass passage of the first and second hydraulic pumps 1 and 2, respectively, and when the detected operating pressure is smaller than the set value, the closed state of the speed preventing logic valve 16 is maintained and detected. It further includes a flow rate sensing valve (11, 12) for outputting the operating pressure as a signal pressure to open the speed preventing logic valve 16 when the operating pressure is greater than the set value.

이하에서, 본 발명의 실시예에 의한 크롤러식 굴삭기의 주행모터 과속 방지장치의 사용예를 첨부된 도면을 참조하여 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings an example of the use of the traveling motor overspeed prevention apparatus of a crawler type excavator according to an embodiment of the present invention will be described in detail.

도 2에 도시된 바와 같이, 작업조건에 따라 작업능률을 향상시키기 위하여 주행모터(3,5)와 작업장치(버킷실린더(4) 또는 아암실린더(6) 등)를 동시에 구동시키는 작업모드시, 주행직진밸브(10)에 의해 제1,2유압펌프(1,2)로부터의 작동유는 합류된다. 이때 제1,2유압펌프(1,2)의 센터바이패스통로 하류측에 설치된 유량감지밸브(11,12)에 의해 검출되는 작동압은 낮아지게 된다. 즉 제1,2유압펌프(1,2)로부터 토출되는 작동유가 합류되어 주행모터(3,5)중 어느 하나의 주행모터에 공급되므로 작동압이 낮게 된다.As shown in Figure 2, in the working mode for simultaneously driving the driving motor (3, 5) and the work device (bucket cylinder 4 or arm cylinder 6, etc.) in order to improve the work efficiency according to the working conditions, The hydraulic fluid from the first and second hydraulic pumps 1 and 2 are joined by the traveling straight valve 10. At this time, the operating pressure detected by the flow rate sensing valves 11 and 12 provided downstream of the center bypass passage of the first and second hydraulic pumps 1 and 2 becomes low. That is, since the hydraulic oil discharged from the first and second hydraulic pumps 1 and 2 joins and is supplied to any one of the driving motors 3 and 5, the operating pressure is low.

전술한 유량감지밸브(11,12)에 의해 검출되는 작동압이 밸브스프링(16a)의 설정압력보다 낮게되는 경우, 과속방지 로직밸브(16)는 밸브스프링(16a)의 설정압 력에 의해 개방되지 않는다. 즉 파일럿 펌프(Pp)로부터 주행 1속/2속절환밸브(15)를 통과하는 주행 2속 제어압이 속도조절밸브(13,14)에 공급되지않게 되므로 주행모터(3,5)는 2속으로 변환되지 않는다.When the operating pressure detected by the above-described flow rate sensing valves 11 and 12 is lower than the set pressure of the valve spring 16a, the overspeed prevention logic valve 16 is opened by the set pressure of the valve spring 16a. It doesn't work. That is, since the traveling second speed control pressure passing from the pilot pump Pp through the traveling first speed / 2 speed switching valve 15 is not supplied to the speed regulating valves 13 and 14, the traveling motors 3 and 5 are driven at the second speed. Is not converted to

따라서, 주행장치와 작업장치를 동시에 구동시키는 작업모드로 인해 주행직진밸브(10)가 절환되는 경우에도 제1,2유압펌프(1,2)로부터 토출되어 합류되는 작동유에 의해 주행모터(3,5)의 2속에 의한 과속이 방지된다.Therefore, even when the traveling straight valve 10 is switched due to the operation mode for driving the traveling device and the work device at the same time, the traveling motor 3, by the hydraulic oil discharged from the first and second hydraulic pumps 1 and 2 and joined. Overspeed by 2 speed of 5) is prevented.

한편, 주행모터용 절환밸브(7,8)의 중립으로 인해 제1,2유압펌프(1,2)로부터의 작동유가 센터바이패스통로를 따라 주행모터(3,5)에 공급되지않고, 유압탱크(19)로 직접 토출되는 경우, 유량감지밸브(11,12)에 의해 검출되는 작동압은 설정압을 초과하게 된다.On the other hand, due to the neutrality of the switching valves 7 and 8 for the traveling motor, the hydraulic oil from the first and second hydraulic pumps 1 and 2 is not supplied to the traveling motors 3 and 5 along the center bypass passage, When directly discharged to the tank 19, the operating pressure detected by the flow rate sensing valves 11 and 12 exceeds the set pressure.

즉 유량감지밸브(11,12)로부터의 작동압이 과속방지 로직밸브(16)의 밸브스프링(16a)의 설정압력보다 높게 되므로, 과속방지 로직밸브의(16) 면적차와 유량감지밸브(12)로부터 공급되는 신호압력에 의해 과속방지 로직밸브(16)는 개방된다.That is, since the operating pressure from the flow rate detection valves 11 and 12 becomes higher than the set pressure of the valve spring 16a of the speed check logic valve 16, the area difference of the speed check logic valve 16 and the flow rate detection valve 12 The speed preventing logic valve 16 is opened by the signal pressure supplied from

따라서, 주행 1속/2속절환밸브(15)에 의해(도면에 도시된 상태임), 파일럿 펌프(Pp)로부터 주행 1속/2속절환밸브(15)를 통과하는 주행 2속 제어압이 과속방지 로직밸브(16)를 경유하여 속도조절밸브(13,14)에 각각 공급되어 내부 스풀을 절환시킨다. 이로 인해 좌우측 주행모터(3,5)의 사판 경전각을 작게 조정하므로 주행모터(3,5)는 2속으로 변환된다.Accordingly, the traveling second speed control pressure passing from the pilot pump Pp through the traveling first speed / 2 speed switching valve 15 by the traveling first speed / 2 speed switching valve 15 is shown. It is supplied to the speed regulating valves 13 and 14 via the overspeed prevention logic valve 16 to switch the internal spool. As a result, the swash plate tilt angles of the left and right traveling motors 3 and 5 are adjusted to be small so that the traveling motors 3 and 5 are converted to the second speed.

이로 인해 주행장치와 작업장치를 동시에 구동시키는 작업모드시, 제1,2유압 펌프(1,2)로부터 토출되어 합류되는 작동유는 주행직진밸브(10)를 경유하여 주행모터(3,5)에 공급되므로 소정의 주행속도를 확보할 수 있다.Therefore, in the working mode for simultaneously driving the traveling device and the work device, the hydraulic fluid discharged from the first and second hydraulic pumps 1 and 2 and joined to the traveling motors 3 and 5 via the traveling straight valve 10. Since it is supplied, a predetermined traveling speed can be secured.

전술한 바와 같이, 본 발명의 실시예에 의한 크롤러식 굴삭기의 주행모터 과속 방지장치는 아래와 같은 이점을 갖는다.As described above, the traveling motor overspeed prevention apparatus of the crawler excavator according to the embodiment of the present invention has the following advantages.

크롤러식 굴삭기의 주행장치와 작업장치를 동시에 구동시키는 작업모드시, 작업장치에 발생되는 부하압력에 따라 과다하게 공급되는 작동유에 의해 주행모터가 과속으로 인해 파손되는 것을 방지하고 사용수명을 연장할 수 있다.In the working mode of simultaneously driving the traveling device and the working device of the crawler excavator, the traveling motor can be prevented from being damaged due to the overspeed and the service life can be extended due to the excessive supply of hydraulic oil according to the load pressure generated in the working device. have.

Claims (2)

가변용량형 제1,2유압펌프;Variable displacement first and second hydraulic pumps; 상기 제1유압펌프에 연결되는 좌측 주행모터 및 작업장치;A left driving motor and a work device connected to the first hydraulic pump; 상기 제2유압펌프에 연결되는 우측 주행모터 및 작업장치;A right traveling motor and a working device connected to the second hydraulic pump; 상기 제1,2유압펌프로부터 좌측,우측 주행모터 및 작업장치에 각각 공급되는 작동유를 제어하는 절환밸브를 포함하는 콘트롤밸브;A control valve including a switching valve for controlling hydraulic fluid supplied from the first and second hydraulic pumps to the left and right driving motors and the work device, respectively; 상기 제1,2유압펌프의 센터바이패스통로 상류측에서 병렬연결된 관로에 설치되며, 주행장치와 작업장치를 동시에 구동시키는 작업모드시 신호압 공급으로 절환되어 장비의 주행직진성을 확보하는 주행직진밸브;Running straight valve is installed in the pipeline connected in parallel upstream of the center bypass passage of the first and second hydraulic pump, and switched to the signal pressure supply in the working mode to drive the traveling device and the working device at the same time to ensure the running straightness of the equipment ; 신호압 공급으로 절환시 상기 좌측 및 우측 주행모터의 사판경전각을 각각 제어하는 속도조절밸브;A speed regulating valve controlling the swash plate tilt angles of the left and right driving motors when switching to a signal pressure supply; 사용자에 의한 조작으로 절환되어 상기 속도조절밸브를 절환시키도록 제어신호를 출력하는 주행 1속/2속절환밸브; 및A traveling 1 speed / 2 speed switching valve which is switched by an operation by a user and outputs a control signal to switch the speed regulating valve; And 상기 주행 1속/2속절환밸브와 속도조절밸브사이에 설치되고, 주행장치와 작업장치를 동시에 구동시키는 작업모드시 상기 작업장치에 발생되는 부하압력에 따라 상기 속도조절밸브에 공급되는 제어신호를 단속하는 과속방지용 로직밸브;를 구비하는 크롤러식 굴삭기의 주행모터 과속 방지장치에 있어서:The control signal is provided between the traveling 1 speed / 2 speed switching valve and the speed control valve, and supplies the control signal to the speed control valve according to the load pressure generated in the work device in a work mode for simultaneously driving the travel device and the work device. In the traveling motor overspeed prevention device of a crawler-type excavator provided with; 상기 제1,2유압펌프의 센터바이패스통로의 하류측에 각각 설치되고, 검출되는 작동압이 설정값보다 작은 경우 상기 과속방지용 로직밸브의 닫힌상태를 유지하고, 검출되는 작동압이 설정값보다 큰 경우 상기 과속방지용 로직밸브를 개방시키도록 작동압을 신호압력으로서 출력하는 유량감지밸브를 구비하는 것을 특징으로 하는 크롤러식 굴삭기의 주행모터 과속 방지장치.Respectively installed on the downstream side of the center bypass passage of the first and second hydraulic pumps, and if the detected operating pressure is less than the set value, the closed speed of the speed preventing logic valve is maintained and the detected operating pressure is greater than the set value. And a flow rate detecting valve for outputting an operating pressure as a signal pressure to open the speed preventing logic valve when the speed limit is large. 삭제delete
KR1020070053645A 2007-06-01 2007-06-01 prevention device overspeed travel motor of crawler excavator KR101356008B1 (en)

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