KR20070060388A - A with adjusting structure for an electric automobile - Google Patents

A with adjusting structure for an electric automobile Download PDF

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Publication number
KR20070060388A
KR20070060388A KR1020050119734A KR20050119734A KR20070060388A KR 20070060388 A KR20070060388 A KR 20070060388A KR 1020050119734 A KR1020050119734 A KR 1020050119734A KR 20050119734 A KR20050119734 A KR 20050119734A KR 20070060388 A KR20070060388 A KR 20070060388A
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South Korea
Prior art keywords
vehicle
hydraulic
electric vehicle
driving
lubrication
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KR1020050119734A
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Korean (ko)
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김영규
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현대자동차주식회사
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Priority to KR1020050119734A priority Critical patent/KR20070060388A/en
Publication of KR20070060388A publication Critical patent/KR20070060388A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D61/00—Motor vehicles or trailers, characterised by the arrangement or number of wheels, not otherwise provided for, e.g. four wheels in diamond pattern
    • B62D61/12—Motor vehicles or trailers, characterised by the arrangement or number of wheels, not otherwise provided for, e.g. four wheels in diamond pattern with variable number of ground engaging wheels, e.g. with some wheels arranged higher than others, or with retractable wheels
    • B62D61/125—Motor vehicles or trailers, characterised by the arrangement or number of wheels, not otherwise provided for, e.g. four wheels in diamond pattern with variable number of ground engaging wheels, e.g. with some wheels arranged higher than others, or with retractable wheels the retractable wheel being a part of a set of tandem wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K7/0007—Disposition of motor in, or adjacent to, traction wheel the motor being electric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/90—Vehicles comprising electric prime movers
    • B60Y2200/91—Electric vehicles

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

A track tread adjusting structure of an electric vehicle is provided to allow a drive to adjust the track tread of the electric vehicle by installing a link structure operated by the hydraulic pressure in a drive wheel of the electric vehicle. In an electric vehicle, drive motors generating power for travelling the vehicle are installed in drive wheels. A track tread adjusting structure of the electric vehicle includes a pair of links(20), a hydraulic cylinder(30), a hydraulic pump(40), and a hydraulic valve(50). One end of the link is connected to the body of the vehicle and the other end thereof is connected to the drive wheel. One end of the hydraulic cylinder is connected to the body and the other end thereof is connected to the links. The hydraulic pump controls the hydraulic pressure supplied to the hydraulic cylinder by the manipulation of the driver. The hydraulic valve controls the hydraulic pressure supplied from the hydraulic pump.

Description

전기 자동차의 윤거 가변 구조{A with adjusting structure for an electric automobile}A with adjusting structure for an electric automobile

도 1은 본 발명에 의한 전기 자동차의 윤거 가변 구조의 일 실시예의 구성을 나타내는 도면.BRIEF DESCRIPTION OF THE DRAWINGS The figure which shows the structure of one Embodiment of the lubrication variable structure of the electric vehicle by this invention.

도 2는 본 발명에 의한 전기 자동차의 윤거 가변 구조의 동작 상태를 나타내는 도면. 2 is a view showing an operating state of the tunable variable structure of the electric vehicle according to the present invention.

도 3a와 도 3b는 차량 주행시 노면 요철을 피하기 위한 본 발명의 사용 상태를 나타내는 도면.3A and 3B are views showing a state of use of the present invention for avoiding road surface irregularities when driving a vehicle.

도 4a와 도 4b는 협소 공간 주행시의 본 발명의 사용 상태를 나타내는 도면.4A and 4B show a state of use of the present invention in narrow space travel.

도 5a와 도 5b는 부드러운 지면 주행시의 본 발명의 사용 상태를 나타내는 도면.5A and 5B are views showing the use state of the present invention in smooth ground running.

도 6은 차량 선회시 본 발명의 사용 상태를 나타내는 도면.6 is a view showing a state of use of the present invention when turning the vehicle.

-도면의 주요부분에 대한 부호설명-Code descriptions for the main parts of the drawings

10 : 윤거 가변 구조 20 : 링크10: lubrication variable structure 20: link

30 : 유압 실린더 40 : 유압 펌프30: hydraulic cylinder 40: hydraulic pump

50 : 유압 밸브50: hydraulic valve

본 발명은 각각의 구동휠에 동력 모터가 설치되는 전기 자동차의 구동휠에 유압에 의해 동작하는 링크 구조를 설치하여 운전자의 필요에 의해 차량 윤거를 변화시켜 다양한 주행 환경에 맞추어 차량의 주행이 가능하도록 하는 전기 자동차의 윤거 가변 구조에 관한 것이다. The present invention installs a link structure operated by hydraulic pressure to the driving wheel of the electric vehicle in which the power motor is installed on each driving wheel to change the vehicle lubrication according to the needs of the driver so that the vehicle can be driven in accordance with various driving environments. It relates to a lubrication variable structure of an electric vehicle.

차량 운행중 도로면에서부터 받는 바퀴의 진동이나 충격을 흡수하여 승차감을 좋게 하는 현가장치, 운전자의 의지에 따라 차량을 주행하는 조향장치, 그리고 차량의 진행을 제동하는 제동장치가 있다. There is a suspension system that absorbs the vibration or shock of the wheels received from the road surface while driving the vehicle to improve ride comfort, a steering system that drives the vehicle at the driver's will, and a brake system that brakes the progress of the vehicle.

그리고 일반적으로 상기와 같은 현가장치, 조향장치 및 제동장치는 자동차의 차륜에 설치되며, 선택적으로 차륜에는 구동축이 설치되어 엔진의 회전력을 받게 된다. In general, the suspension device, the steering device and the braking device as described above are installed on the wheel of the vehicle, and optionally the drive shaft is installed to receive the rotational force of the engine.

또한 상기 차륜 특히 전륜은 자동차가 주행할 때 항상 바른 방향을 유지하고, 핸들 조작이나 외부 힘에 의해 주행 방향이 잘못되었을 때에 즉시 직진 상태로 되돌아가는 성질이 요구되며, 핸들조작력도 경감하게 되어야 한다. In addition, the wheel, in particular the front wheel is always required to maintain the right direction when the vehicle is running, and to return to the straight state immediately when the driving direction is wrong by the steering wheel operation or external force, and the steering wheel handling force should be reduced.

상기와 같은 차량의 주행 성능은 차량의 좌우 구동휠간의 거리 즉, 윤거의 변화에도 기인된다. The driving performance of the vehicle is also attributable to the change in distance between the left and right driving wheels of the vehicle, that is, the wheel.

차량의 주행 도중 차량의 주행 도로의 폭이 급변하는 경우에는 차량의 윤거에 따라 주행이 어려운 경우가 있었다. 또한, 차량을 좁은 공간에 주차하는 경우에 윤거에 따라 주차가 불가능한 경우도 있었다.When the width of the traveling road of the vehicle suddenly changes while the vehicle is running, driving may be difficult due to the leaching of the vehicle. In some cases, when parking a vehicle in a narrow space, parking may not be possible depending on the roundabout.

이때 차량의 윤거를 변화시키려고 하였으나, 차량의 구동휠에는 회전력을 받는 구동축이 연결되어 있어 윤거 변화를 이룰 수 없는 문제점이 잇었다. At this time, the attempt was made to change the lubrication of the vehicle, but the driving wheel of the vehicle had a problem in that the lubrication change could not be achieved because the driving shaft receiving rotational force was connected.

본 발명은 이와 같은 종래의 제반 문제점을 해결하기 위한 것으로서, 각각의 구동휠에 동력 모터가 설치되는 전기 자동차의 구동휠에 유압에 의해 동작하는 링크 구조를 설치하여 운전자의 필요에 의해 차량 윤거를 변화시킬 수 있도록 하는 전기 자동차의 윤거 가변 구조를 제공하는 것을 목적으로 한다. The present invention is to solve such a conventional problem, by installing a link structure that is operated by hydraulic pressure on the driving wheel of the electric vehicle in which the power motor is installed on each driving wheel to change the vehicle lubrication according to the needs of the driver An object of the present invention is to provide a lubrication variable structure of an electric vehicle.

도 1은 본 발명에 의한 전기 자동차의 윤거 가변 구조의 일 실시예의 구성을 나타내는 도면으로서, 차량 주행에 필요한 동력을 발생시키는 구동 모터가 각각의 구동휠에 설치되는 전기 자동차에 있어서, 일단은 차체에 연결되고 타단은 구동휠에 연결되는 한 쌍의 링크(20), 일단은 차체에 연결되고 타단은 상기 한 쌍의 링크(20)에 연결되는 유압 실린더(30), 운전자의 조작에 의해 상기 유압 실린더(30)에 공급되는 유압을 제어하는 유압 펌프(40), 상기 유압 펌프(40)에서 공급되는 유압을 제어하는 유압 밸브(50)로 구성된 윤거 가변 구조(10)가 전기 자동차의 구동휠 각각에 설치되어 있음을 도시하고 있다. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing the configuration of an embodiment of a variable lubrication structure of an electric vehicle according to the present invention. In an electric vehicle in which a driving motor for generating power for driving a vehicle is provided in each driving wheel, one end of the electric vehicle is provided in a vehicle body. A pair of links 20 connected to the other end and connected to a driving wheel, one end of the hydraulic cylinder 30 connected to the vehicle body and the other end connected to the pair of links 20, the hydraulic cylinder by the driver's operation A lubrication variable structure 10 composed of a hydraulic pump 40 for controlling the hydraulic pressure supplied to the 30 and a hydraulic valve 50 for controlling the hydraulic pressure supplied from the hydraulic pump 40 is provided on each of the driving wheels of the electric vehicle. It is installed.

상기 윤거 가변 구조(10)는 운전자의 선택적 조작에 의해 개별적으로 동작되는 것이 바람직하다. Preferably, the lubrication variable structure 10 is individually operated by the selective manipulation of the driver.

상기와 같이 구성된 본 발명의 일 실시예를 설명하면 다음과 같다.Referring to one embodiment of the present invention configured as described above are as follows.

전기 자동차의 경우 일반적인 차량과 같이 하나의 구동 모터에 의해 차량이 주행되도록 구성되기도 하지만, 차세대 전기 자동차의 경우 차량의 구동휠 각각에 구동 모터를 설치하고 주행 상황에 맞추어 구동 모터를 제어함으로서 차량의 안정된 주행 성능을 얻을 수 있도록 하는 것이 예상되므로, 본 발명을 추가로 설치하여 전기 자동차의 효율을 증대시키는 것이 필요하다. In the case of an electric vehicle, the vehicle may be driven by a single driving motor as in a general vehicle, but in the case of the next-generation electric vehicle, a driving motor is installed at each driving wheel of the vehicle and the driving motor is controlled according to the driving situation. Since it is anticipated that driving performance can be obtained, it is necessary to further install the present invention to increase the efficiency of the electric vehicle.

우선, 차체의 구동축 설치 부위에 근접한 위치에 한쌍의 링크(20)를 설치하도록 한다. 링크(20)의 일단은 차체(1)에 회전 가능하게 연결되고 타단은 구동휠(2)에 회전 가능하게 연결되어 있다. 또한, 차체(1)의 일측에는 유압 실린더(30)의 일단이 회전가능하게 연결되고 유압 실린더(30)의 타단은 일측 링크(20)의 중간부에 회전가능하게 연결되어 있어, 유압 실린더(30)의 동작에 따라 링크(20)가 동작하면서 구동휠(2)과 차체(1)와의 거리가 변화된다.First, a pair of links 20 are provided at a position close to the drive shaft installation portion of the vehicle body. One end of the link 20 is rotatably connected to the vehicle body 1 and the other end is rotatably connected to the drive wheel 2. In addition, one end of the hydraulic cylinder 30 is rotatably connected to one side of the vehicle body 1, and the other end of the hydraulic cylinder 30 is rotatably connected to an intermediate portion of the one-side link 20, thereby providing a hydraulic cylinder 30. The distance between the drive wheel 2 and the vehicle body 1 is changed while the link 20 operates according to the operation of.

구동휠(2)과 차체(1)의 거리 변화는 차량의 윤거 변화로 나타나므로, 운전자는 필요로 하는 차량의 주행 상태에 따라 유압 실린더(30)를 제어하여 적절한 차량 윤거를 얻도록 한다. Since the change in the distance between the driving wheel 2 and the vehicle body 1 is represented by the change in the lubrication of the vehicle, the driver controls the hydraulic cylinder 30 according to the driving condition of the vehicle to obtain the appropriate vehicle lubrication.

즉, 운전자의 조작에 의해 유압 밸브(50)가 동작하면 유압 밸브(50)를 통해 공급되는 유압이 유압 실린더(30)로 유입되어 유압 실린더(30)가 신장되도록 하고, 이에 따라 유압 실린더(30)에 연결되어 있는 링크(20)가 차체와의 연결점을 기준으로 회전하게 되어 차량의 구동휠은 도 1에 도시되어 있는 상태에서 도 2에 도시되어 있는 상태가 된다. 이러한 구동휠의 상태 변화는 곧 차량의 윤거 변화로 나타난다. That is, when the hydraulic valve 50 is operated by the driver's operation, the hydraulic pressure supplied through the hydraulic valve 50 flows into the hydraulic cylinder 30 so that the hydraulic cylinder 30 is extended, and accordingly, the hydraulic cylinder 30 Link 20 connected to the) is rotated based on the connection point with the vehicle body so that the driving wheel of the vehicle is shown in FIG. 2 in the state shown in FIG. This change in the state of the drive wheel is represented by a change in the lubrication of the vehicle.

상기와 같이 차량 윤거 변화는 주행 상황에 따라 다음과 같이 변화될 수 있 다. As described above, the vehicle lubrication change may be changed as follows depending on the driving situation.

도 3a에 도시되어 있는 바와 같이, 차량의 주행 도중 차량의 주행 방향 전방에 차량의 윤거보다 넓은 폭을 갖는 노면 요철이 있는 경우 운전자는 구동휠에 설치되어 있는 윤거 가변 구조를 동작하도록 한다. As shown in FIG. 3A, when there is a road surface irregularity having a width wider than that of the vehicle during the driving direction of the vehicle, the driver operates the variable wheel structure installed in the driving wheel.

즉, 운전자의 조작에 의해 유압 펌프(40)가 동작되어 유압이 발생되고, 유압 밸브(50)가 개방되면 유압 펌프(40)에서 발생된 유압이 유압 실린더(30)로 입력되어 유압 실린더(30)의 길이가 신장되도록 한다. 유압 실린더(30)의 신장에 의해 링크(20)가 회전하게 되어 구동휠은 차체에서 멀어져 도 3b에 도시되어 있는 바와 같이 차량의 윤거가 넓어지게 된다. 이때 차량의 윤거가 필요한 수준이 되었을 때 유압 밸브(50)가 폐쇄되도록 하여 차량의 윤거가 일정 범위에서 멈춰지도록 한다. That is, the hydraulic pump 40 is operated by the driver's operation to generate the hydraulic pressure. When the hydraulic valve 50 is opened, the hydraulic pressure generated by the hydraulic pump 40 is inputted into the hydraulic cylinder 30 to supply the hydraulic cylinder 30. Make the length of) increase. The extension of the hydraulic cylinder 30 causes the link 20 to rotate so that the driving wheel is far from the vehicle body, thereby widening the lubrication of the vehicle as shown in FIG. 3B. At this time, when the lubrication of the vehicle reaches the required level, the hydraulic valve 50 is closed so that the lubrication of the vehicle is stopped in a certain range.

차량이 주행하는 도중, 차량의 윤거보다 좁은 폭의 도로를 만나는 경우에는, 운전자의 조작에 의해 유압 펌프(40)가 외부로 유압의 공급이 차단되도록 동작하고 유압 밸브(50)가 개방되면 유압 실린더(30)의 오일이 배출되고 유압 실린더(30)의 길이가 축소된다. 유압 실린더(30)의 길이가 축소되면 구동휠은 차체로 다가오게 되어 도 4a에 도시되어 있는 상태에서 도 4b에 도시되어 있는 상태와 같이 차량의 윤거가 좁아지게 된다. When the vehicle encounters a road narrower than the lubrication of the vehicle while the vehicle is running, the hydraulic pump 40 operates to cut off the supply of hydraulic pressure to the outside by the driver's operation, and the hydraulic cylinder is opened when the hydraulic valve 50 is opened. The oil of 30 is discharged and the length of the hydraulic cylinder 30 is reduced. When the length of the hydraulic cylinder 30 is reduced, the driving wheel is approached to the vehicle body so that the lubrication of the vehicle is narrowed as shown in FIG. 4B from the state shown in FIG. 4A.

차량이 모래와 진흙같이 부드러운 지면을 주행하는 경우, 차량의 후륜이 전륜의 바퀴 자국을 따라가게 되면 접지력이 부족하여 차량이 지면에 빠져들게 되는 경우가 발생된다. When the vehicle runs on smooth ground such as sand and mud, when the rear wheel of the vehicle follows the wheel marks of the front wheel, the vehicle may fall into the ground due to the lack of grip.

이러한 경우에는 차량의 전륜 또는 후륜에 설치되어 있는 윤거 가변 구조를 동작시켜 도 5a와 도 5b에 도시되어 있는 바와 같이 전륜 또는 후륜의 윤거가 증가되도록 하는 것이 바람직하다. In this case, it is preferable to operate the lubrication variable structure provided in the front wheel or the rear wheel of the vehicle so that the lubrication of the front wheel or the rear wheel is increased as shown in Figs. 5A and 5B.

또한, 차량의 주행 도중 급선회가 필요하게 되는 경우, 차량의 선회 방향이 좌측인 경우에는 차량의 좌측 에 설치되어 있는 윤거 가변 구조가 동작되도록 하고, 차량의 선회 방향이 우측인 경우에는 차량의 우측 방향에 설치되어 있는 윤거 가변 구조가 동작되도록 하여, 차량의 좌측 또는 우측의 윤거가 증가되도록 하여 차량의 선회시 차량의 전복이 방지되도록 한다. 도 6은 차량이 우측으로 선회하는 경우 차량 우측 방향에 설치되어 있는 윤거 가변 구조가 동작된 경우를 나타낸다. In addition, when a rapid turning is required during driving of the vehicle, when the turning direction of the vehicle is on the left side, the lubrication variable structure installed on the left side of the vehicle is operated. When the turning direction of the vehicle is on the right side, the right direction of the vehicle is performed. The lubrication variable structure installed in the operation is operated so that the lubrication of the left or right side of the vehicle is increased to prevent the vehicle from overturning when the vehicle is turning. FIG. 6 shows a case in which the wheeled variable structure installed in the right direction of the vehicle is operated when the vehicle turns to the right.

이상에서는 본 발명을 특정의 바람직한 실시예에 대하여 도시하고 설명하였으나, 본 발명은 이러한 실시예에 한정되지 않으며, 당해 발명이 속하는 기술분야에서 통상의 지식을 가진 자가 특허청구범위에서 청구하는 본 발명의 기술적 사상을 벗어나지 않는 범위내에서 실시할 수 있는 다양한 형태의 실시예들을 모두 포함한다.While the invention has been shown and described with respect to certain preferred embodiments thereof, the invention is not limited to these embodiments, and has been claimed by those of ordinary skill in the art to which the invention pertains. It includes all the various forms of embodiments that can be carried out without departing from the spirit.

상기와 같은 본 발명은, 각각의 구동휠에 동력 모터가 설치되는 전기 자동차의 구동휠에 유압에 의해 동작하는 링크 구조를 설치하여 운전자의 필요에 의해 차량 윤거를 변화시켜 다양한 주행 환경에 맞추어 차량의 주행이 가능하도록 하는 효과가 있다. The present invention as described above, by installing a link structure that is operated by hydraulic pressure in the drive wheel of the electric vehicle is installed on each drive wheel by changing the vehicle lubrication according to the needs of the driver to meet the various driving environment of the vehicle There is an effect to enable running.

Claims (2)

차량 주행에 필요한 동력을 발생시키는 구동 모터가 각각의 구동휠에 설치되는 전기 자동차에 있어서, 일단은 차체에 연결되고 타단은 구동휠에 연결되는 한 쌍의 링크(20), 일단은 차체에 연결되고 타단은 상기 한 쌍의 링크(20)에 연결되는 유압 실린더(30), 운전자의 조작에 의해 상기 유압 실린더(30)에 공급되는 유압을 제어하는 유압 펌프(40), 상기 유압 펌프(40)에서 공급되는 유압을 제어하는 유압 밸브(50)로 구성된 윤거 가변 구조(10)가 전기 자동차의 구동휠 각각에 설치되어 구성되는 것을 특징으로 하는 전기 자동차의 윤거 가변 구조.In an electric vehicle in which a driving motor for generating power required for driving a vehicle is installed in each driving wheel, a pair of links 20 connected at one end to the vehicle body and at the other end to the drive wheel, one end to the vehicle body, The other end of the hydraulic cylinder 30 connected to the pair of links 20, the hydraulic pump 40 for controlling the hydraulic pressure supplied to the hydraulic cylinder 30 by the driver's operation, the hydraulic pump 40 in A lubrication variable structure of an electric vehicle, characterized in that the lubrication variable structure (10) consisting of a hydraulic valve 50 for controlling the supplied hydraulic pressure is installed on each of the drive wheels of the electric vehicle. 제 1 항에 있어서, 상기 윤거 가변 구조(10)는 운전자의 선택적 조작에 의해 개별적으로 동작되는 것을 특징으로 하는 전기 자동차의 윤거 가변 구조. 2. The variable wheel structure of an electric vehicle according to claim 1, wherein said variable wheel structure (10) is individually operated by a selective manipulation of a driver.
KR1020050119734A 2005-12-08 2005-12-08 A with adjusting structure for an electric automobile KR20070060388A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103121377A (en) * 2013-01-04 2013-05-29 现代农装科技股份有限公司 High ground clearance self-propelled chassis with adjustable wheel tread and wheel tread adjusting method of tractor
RU2483937C1 (en) * 2011-11-17 2013-06-10 Андрей Михайлович Титов High cross-country capacity vehicle
CN104002890A (en) * 2014-06-11 2014-08-27 河南农业大学 Rear wheel track setting system for three-wheel high-frame field operation vehicle
CN104163085A (en) * 2014-08-04 2014-11-26 浙江吉利控股集团有限公司 Automobile wheel tread adjusting device
KR20170111807A (en) 2016-03-29 2017-10-12 대동공업주식회사 Wheel range regulation type axle assembly

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2483937C1 (en) * 2011-11-17 2013-06-10 Андрей Михайлович Титов High cross-country capacity vehicle
CN103121377A (en) * 2013-01-04 2013-05-29 现代农装科技股份有限公司 High ground clearance self-propelled chassis with adjustable wheel tread and wheel tread adjusting method of tractor
CN104002890A (en) * 2014-06-11 2014-08-27 河南农业大学 Rear wheel track setting system for three-wheel high-frame field operation vehicle
CN104163085A (en) * 2014-08-04 2014-11-26 浙江吉利控股集团有限公司 Automobile wheel tread adjusting device
KR20170111807A (en) 2016-03-29 2017-10-12 대동공업주식회사 Wheel range regulation type axle assembly

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