KR100530033B1 - check valve of brake electronic control system - Google Patents

check valve of brake electronic control system Download PDF

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Publication number
KR100530033B1
KR100530033B1 KR10-2004-0018013A KR20040018013A KR100530033B1 KR 100530033 B1 KR100530033 B1 KR 100530033B1 KR 20040018013 A KR20040018013 A KR 20040018013A KR 100530033 B1 KR100530033 B1 KR 100530033B1
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KR
South Korea
Prior art keywords
valve body
check valve
spring
electronically controlled
ball
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KR10-2004-0018013A
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Korean (ko)
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KR20050092891A (en
Inventor
권오균
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현대모비스 주식회사
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Priority to KR10-2004-0018013A priority Critical patent/KR100530033B1/en
Publication of KR20050092891A publication Critical patent/KR20050092891A/en
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Publication of KR100530033B1 publication Critical patent/KR100530033B1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/04—Check valves with guided rigid valve members shaped as balls
    • F16K15/044—Check valves with guided rigid valve members shaped as balls spring-loaded
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B60T8/176—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/4031—Pump units characterised by their construction or mounting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • F16K27/0245—Construction of housing; Use of materials therefor of lift valves with ball-shaped valve members

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Transportation (AREA)
  • Check Valves (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

본 발명은 전자제어식 브레이크 장치의 체크밸브에 관한 것으로서, 특히, 체크밸브 구조가 단순화됨으로써, 부품수가 적어지고, 조립이 단순하고 쉬우며, 저가고, 동시에, 제품의 사이즈가 작아질 수 있다.The present invention relates to a check valve of an electronically controlled brake device, in particular, by simplifying the check valve structure, the number of parts is small, the assembly is simple and easy, inexpensive, and at the same time, the size of the product can be reduced.

또한, 밸브 바디의 가공성형이 용이하고, 스프링 장착길이(L1) 관리가 필요치 않으므로 관리 및 조립성을 향상시킬 수 있는 전자제어식 브레이크 장치의 체크밸브에 관한 것이다.The present invention also relates to a check valve of an electronically controlled brake device that can be easily formed into a valve body and does not require spring-loaded length L1 to improve management and assembly.

Description

전자제어식 브레이크 장치의 체크밸브 { check valve of brake electronic control system }Check valve of brake electronic control system

본 발명은 안티록 브레이크 시스템, 트랙션 제어 시스템, 차량자세제어 시스템과 같은 전자제어식 브레이크 장치의 체크밸브에 관한 것으로써, 특히, 체크밸브의 구조가 콤팩트화된 구조에 관한 것이다.The present invention relates to a check valve of an electronically controlled brake device such as an antilock brake system, a traction control system, a vehicle attitude control system, and more particularly, to a structure in which the structure of the check valve is compact.

일반적으로 전자제어식 브레이크 시스템은 차량의 슬립현상을 효율적으로 방지하여 강력하고 안정된 제동력을 얻기 위한 것으로, 제동 시 휠의 미끄러짐을 방지하는 안티록 브레이크 시스템(ABS:Anti-Lock Brake System)과, 차량의 급발진 또는 급가속 시 구동륜의 슬립을 방지하는 브레이크 트랙션 제어 시스템(BTCS:Brake Traction Control System)과, 안티록 브레이크 시스템과 트랙션 제어를 조합하여 브레이크 액압을 제어함으로써 차량의 주행상태를 안정적으로 유지시키는 차량자세제어 시스템(VDC:Vehicle Dynamic Control System) 등이 개시되어 있다.In general, the electronically controlled brake system effectively prevents the slip of the vehicle and obtains a strong and stable braking force.Anti-lock brake system (ABS) to prevent the wheel from slipping during braking and Brake Traction Control System (BTCS) that prevents slippage of drive wheels during sudden start or acceleration, and anti-lock brake system and traction control combine to control brake hydraulic pressure to keep the vehicle stable. A posture control system (VDC) and the like are disclosed.

이러한 전자제어식 브레이크 시스템은 차량의 휠에 장착된 유압브레이크 측으로 전달되는 제동유압을 제어하기 위한 다수개의 솔레노이드밸브와, 유압브레이크로부터 빠져나온 오일을 일시 저장하기 위한 한 쌍의 저압어큐뮬레이터 및 고압어큐뮬레이터와, 저압어큐뮬레이터의 오일을 강제 펌핑하기 위한 모터 및 펌프와, 솔레노이드밸브와 모터의 구동을 제어하기 위한 ECU를 포함하고 있으며, 이러한 구성요소들은 알루미늄으로 제작된 펌프 하우징에 콤팩트하게 내장되어 있다.The electronically controlled brake system includes a plurality of solenoid valves for controlling the braking hydraulic pressure delivered to the hydraulic brake side mounted on the wheel of the vehicle, a pair of low pressure accumulators and high pressure accumulators for temporarily storing oil discharged from the hydraulic brakes, It includes a motor and pump for forcibly pumping oil in a low pressure accumulator, and an ECU for controlling the operation of the solenoid valve and the motor. These components are compactly embedded in a pump housing made of aluminum.

도 1은 종래의 전자제어식 브레이크 시스템의 체크밸브를 도시한 단면도이다. 1 is a cross-sectional view showing a check valve of a conventional electronically controlled brake system.

도 1에 도시한 바와 같이, 보어(1a)가 형성된 펌프 하우징(1)에 압입 결합되는 밸브 바디(2)와, 이 밸브 바디(2)에 내장되어 오일통로(5a)를 개폐하는 볼(3)과, 이 볼(3)을 탄성 지지하는 탄성부재(4)와, 이 탄성부재(4)의 이탈을 방지하도록 밸브 바디(2)의 후단에 설치되며 연통홀(2b)이 천공된 스프링 시트(5)를 구비하고 있다. As shown in FIG. 1, a valve body 2 press-fitted to a pump housing 1 in which a bore 1a is formed, and a ball 3 that is built in the valve body 2 to open and close the oil passage 5a. ), An elastic member 4 for elastically supporting the ball 3, and a spring seat installed at the rear end of the valve body 2 so as to prevent the elastic member 4 from being separated, and having a communication hole 2b perforated. (5) is provided.

그러나, 전술한 전자제어식 브레이크 시스템의 체크밸브는 다음과 같은 문제가 있다.However, the above-described check valve of the electronically controlled brake system has the following problems.

밸브 바디의 가공성형이 어려우며, 관리가 어렵고, 고가일 뿐만 아니라, 제품 사이즈가 크고, 비용이 많이 든다.The molding of the valve body is difficult, difficult to manage, expensive, and the product size is large and expensive.

또한, 밸브 바디에 스프링 시트를 조립 시 강제 압입공정이 별도로 필요하고, 스프링 장착길이(L1) 관리가 어렵다.In addition, when assembling the spring seat to the valve body requires a forced press process separately, it is difficult to manage the spring mounting length (L1).

한편, 부품수가 많고, 조립이 복잡하고 어렵다.On the other hand, there are many parts, and the assembly is complicated and difficult.

본 발명은 전술한 문제를 해결하기 위하여 안출된 것으로, 부품수가 적어지고, 조립이 단순하고 쉬우며, 저가이고, 동시에, 제품의 사이즈가 작아질 수 있는 것이다.SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the number of parts is small, the assembly is simple and easy, inexpensive, and at the same time, the size of the product can be reduced.

또한, 밸브 바디의 길이가 짧아지게 되어 밸브 바디의 가공성형이 용이하게 되고, 스프링 장착길이(L1) 관리가 필요치 않으므로 관리 및 조립성을 향상시키는데 그 목적이 있다.In addition, the length of the valve body is shortened to facilitate the processing of the valve body, and the spring mounting length (L1) management is not necessary because the purpose is to improve the management and assembly.

전술한 목적을 달성하기 위한 본 발명의 전자제어식 브레이크 장치의 체크밸브는 보어가 형성된 펌프 하우징, 상기 펌프 하우징에 내장되며, 안착홈이 형성된 밸브 바디, 상기 안착홈에 배치되는 스프링 유닛, 상기 스프링 유닛과 상기 밸브 바디에 개재된 볼을 포함하여 이루어지되, 상기 스프링 유닛에는 상기 밸브 바디의 안착홈에 배치되는 원통형 지지대와 상기 원통형 지지대와 결합되어 상기 볼을 지지하는 스프링 판으로 구성된다.Check valve of the electronically controlled brake device of the present invention for achieving the above object is a pump housing having a bore, a valve body is built in the pump housing, a seating groove is formed, a spring unit disposed in the seating groove, the spring unit And a ball interposed in the valve body, wherein the spring unit includes a cylindrical support disposed in a seating groove of the valve body and a spring plate coupled to the cylindrical support to support the ball.

이 구성에 의하면, 종래의 밸브 바디 내부에 설치된 스프링 시트 또는 스프링과 같은 별도의 부재가 필요치 않으므로 부품수가 적어지고, 조립이 단순하고 쉬우며, 제품의 가격이 낮아지며, 동시에, 제품의 사이즈가 작아질 수 있다.According to this configuration, a separate member such as a spring seat or a spring installed inside the conventional valve body is not required, so the number of parts is reduced, the assembly is simple and easy, the price of the product is lowered, and at the same time, the size of the product is reduced. Can be.

또한, 밸브 바디의 길이가 짧아지므로 밸브 바디의 가공성형이 용이하게될 수 있을 뿐만 아니라, 스프링 장착길이(L1) 관리가 필요치 않게 되어 관리 및 조립성이 향상될 수 있다.In addition, since the length of the valve body is shortened, not only the processing of the valve body can be easily performed, but also the spring mounting length L1 is not required to be managed, and thus the management and assembly can be improved.

이하, 본 발명의 바람직한 실시 예를 첨부도면을 참조하여 상세히 설명하면 다음과 같다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 2는 본 발명의 바람직한 실시 예에 따른 전자제어식 브레이크 장치의 체크밸브를 도시한 단면도이다.Figure 2 is a cross-sectional view showing a check valve of the electronically controlled brake device according to an embodiment of the present invention.

도 2에 도시한 바와 같이, 본 실시예의 전자제어식 브레이크 장치의 체크밸브는 펌프 하우징(10)과, 펌프 하우징(10)에 내장되며, 안착홈이 형성된 밸브 바디(30)와, 안착홈(34)에 배치되는 스프링 유닛(50)과, 스프링 유닛(10)과 상기 밸브 바디(30)에 개재된 볼(40)로 구성된다.As shown in FIG. 2, the check valve of the electronically controlled brake device of the present embodiment is built in the pump housing 10, the pump housing 10, a valve body 30 having a seating groove, and a seating groove 34. It is composed of a spring unit 50 disposed in the), the spring unit 10 and the ball 40 interposed in the valve body 30.

펌프 하우징(10)에는 토출포트(60a)와 흡입포트(60b)로 이루어진 보어(20)가 형성된다.The pump housing 10 has a bore 20 formed of a discharge port 60a and a suction port 60b.

보어(20)는 소경부(22)와 대경부(24)로 이루어지되, 상기 소경부(22)와 대경부(24)를 연결하는 연결부(26)로 이루어진다.Bore 20 is made of a small diameter portion 22 and a large diameter portion 24, it consists of a connecting portion 26 for connecting the small diameter portion 22 and the large diameter portion 24.

여기서, 연결부(26)는 대경부(24)에서 소경부(22)로 갈수록 점점 좁아지는 쐐기 형상으로 이루어지는 것이 바람직하다.Here, it is preferable that the connection part 26 is formed in the wedge shape which becomes narrow gradually from the large diameter part 24 to the small diameter part 22. As shown in FIG.

밸브 바디(30)에는 흡입포트(60b)로부터 오일이 유입 가능하도록 관통홀(32)이 천공 설치된다.The through hole 32 is drilled in the valve body 30 to allow oil to flow from the suction port 60b.

또한, 상기 관통홀(32)을 개폐하는 볼(40)이 내장된다.In addition, a ball 40 for opening and closing the through hole 32 is embedded.

여기서, 흡입포트(60b)로 유입된 오일이 상기 스프링 유닛(50)의 탄성력보다 높게되면, 상기 스프링 유닛(50)에 의해 지지되던 볼(40)이 상승하게되고, 볼(40)은 상기 밸브 바디(30)의 관통홀(32)을 개방하게된다.Here, when the oil introduced into the suction port 60b is higher than the elastic force of the spring unit 50, the ball 40 supported by the spring unit 50 is raised, the ball 40 is the valve The through hole 32 of the body 30 is opened.

이로 인해, 관통홀(32)로 유입된 오일은 볼(40)과 밸브 바디(30)의 간극 사이로 유동하게된다.As a result, the oil introduced into the through hole 32 flows between the gap between the ball 40 and the valve body 30.

스프링 유닛(50)에는 상기 밸브 바디(30)의 안착홈(34)에 배치되는 원통형 지지대(54)와 상기 원통형 지지대(54)와 결합되어 상기 볼(40)을 지지하는 스프링 판(52)으로 구성된다.The spring unit 50 has a cylindrical support 54 disposed in the seating groove 34 of the valve body 30 and a spring plate 52 coupled to the cylindrical support 54 to support the ball 40. It is composed.

원통형 지지대(54)는 상기 흡입포트(60b)로 유입된 오일이 상기 토풀포트(60a)로 유동 가능하도록 천공홀이 형성된 원통 형상으로 이루어지고, 상기 원통형 지지대(54)의 내주면은 상기 밸브 바디(30)의 안착홈(34)에 설치된다.Cylindrical support 54 is formed in a cylindrical shape formed with a drilling hole so that the oil introduced into the suction port (60b) can flow to the top port (60a), the inner peripheral surface of the cylindrical support 54 is the valve body ( 30 is installed in the seating groove (34).

여기서, 스프링 유닛(50)의 원통형 지지대(52)를 밸브 바디(30) 상부에 형성된 안착홈(34)에 설치 시 용접에 의해 고정 설치될 수도 있다.Here, the cylindrical support 52 of the spring unit 50 may be fixedly installed by welding when installed in the mounting groove 34 formed on the valve body 30.

또한, 밸브 바디(30) 상부 외주면에 수나사가 가공되고, 스프링 유닛(50)의 원통형 지지대(54)에 암나사가 가공되거나, 반대로, 밸브 바디(30)의 상부 외주면에 암나사가 가공되고, 스프링 유닛(50)의 원통형 지지대(54)에 수나사가 가공되어 탈/장착이 가능한 체결 구조로 이루어질 수도 있다.In addition, the male thread is machined on the upper outer peripheral surface of the valve body 30, the female thread is machined on the cylindrical support 54 of the spring unit 50, or the female thread is machined on the upper outer peripheral surface of the valve body 30, on the contrary, the spring unit A male screw may be processed to the cylindrical support 54 of 50 so as to have a fastening structure that can be detached / mounted.

이렇게, 스프링 유닛(50)이 원통형 지지대(54)와 스프링 판(52)으로 구성됨으로써, 종래의 밸브 바디(30) 내부에 설치된 스프링 시트 또는 스프링과 같은 별도의 부재가 필요치 않으므로 부품수가 적어지고, 조립이 단순하고 쉬우며, 제품이 저가이고, 동시에, 제품의 사이즈가 작아질 수 있다.In this way, since the spring unit 50 is composed of a cylindrical support 54 and the spring plate 52, the number of parts is reduced because no separate member such as a spring seat or a spring installed inside the conventional valve body 30 is required. Assembly is simple and easy, the product is inexpensive, and at the same time the size of the product can be made smaller.

또한, 밸브 바디(30) 내부에 설치된 스프링 시트 또는 스프링이 제거된 만큼 밸브 바디의 길이가 짧아지게 된다.In addition, the length of the valve body is shortened as the spring seat or spring installed in the valve body 30 is removed.

즉, 밸브 바디(30)의 크기가 작아지고, 드릴링 작업이나 보링 작업등과 같은 홀 작업이 수월해지게 되므로 밸브 바디(30)의 가공성형이 용이하게 될 수 있을 뿐만 아니라, 스프링 장착길이(L1) 관리가 필요치 않게 되어 관리 및 조립성이 향상될 수 있다.That is, since the size of the valve body 30 is reduced, and the hole operation such as drilling work or boring work is facilitated, not only the processing of the valve body 30 can be facilitated, but also the spring mounting length L1 is managed. Can be eliminated and management and assembly can be improved.

본 발명의 전자제어식 브레이크 장치의 체크밸브는 전술한 실시 예에 국한되지 않고 본 발명의 기술 사상이 허용하는 범위 내에서 다양하게 변형하여 실시할 수 있다.The check valve of the electronically controlled brake device of the present invention is not limited to the above-described embodiments, and may be modified in various ways within the scope of the technical idea of the present invention.

이상에서 설명한 바와 같은 본 발명의 전자제어식 브레이크 장치의 체크밸브에 따르면, 다음과 같은 효과가 있다.According to the check valve of the electronically controlled brake device of the present invention as described above, there are the following effects.

밸브 바디에 내장된 볼과 접촉되어 탄성 지지하는 스프링 유닛이 원통형 지지대와 스프링 판으로 이루어짐으로써, 종래의 밸브 바디 내부에 설치된 스프링 시트 또는 스프링과 같은 별도의 부재가 필요치 않으므로 부품수가 적어지고, 조립이 단순하고 쉬우며, 제품의 가격이 낮아지고, 동시에, 제품의 사이즈가 작아질 수 있다.Since the spring unit, which is in contact with the ball embedded in the valve body and elastically supports, is formed of a cylindrical support and a spring plate, there is no need for a separate member such as a spring seat or a spring installed inside the conventional valve body, so that the number of parts is reduced and the assembly is easy. Simple and easy, the price of the product can be lowered and at the same time the size of the product can be made smaller.

또한, 밸브 바디 내부에 설치된 스프링 시트 또는 스프링이 제거된 만큼 밸브 바디의 길이가 짧아지게 되어 밸브 바디의 가공성형이 용이하게 된다.In addition, the length of the valve body is shortened as the spring seat or spring installed inside the valve body is removed, thereby facilitating the forming of the valve body.

한편, 스프링 장착길이(L1) 관리가 필요치 않으므로 관리 및 조립성이 향상될 수 있다.On the other hand, it is not necessary to manage the spring mounting length (L1) can be improved management and assembly.

도 1은 종래의 전자제어식 브레이크 시스템의 체크밸브를 도시한 단면도.1 is a cross-sectional view showing a check valve of a conventional electronically controlled brake system.

도 2는 본 발명의 바람직한 실시 예에 따른 전자제어식 브레이크 장치의 체크밸브를 도시한 단면도.Figure 2 is a cross-sectional view showing a check valve of the electronically controlled brake device according to an embodiment of the present invention.

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>

10 : 펌프 하우징 20 : 보어 10 pump housing 20 bore

22 : 소경부 24 : 대경부 22: small diameter 24: large diameter

26 : 연결부 30 : 밸브 바디 26: connection portion 30: valve body

32 : 관통홀 34 : 안착홈32: through hole 34: seating groove

40 : 볼 50 : 스프링 유닛40: ball 50: spring unit

52 : 스프링 판 54 : 원통형 지지대52: spring plate 54: cylindrical support

60a : 토출포트 60b : 흡입포트 60a: discharge port 60b: suction port

Claims (1)

보어가 형성된 펌프 하우징;A bore formed pump housing; 상기 펌프 하우징에 내장되며, 안착홈이 형성된 밸브 바디;A valve body embedded in the pump housing and having a seating groove formed therein; 상기 안착홈에 배치되는 스프링 유닛;A spring unit disposed in the seating groove; 상기 스프링 유닛과 상기 밸브 바디사이에 개재된 볼을 포함하여 이루어지되, It comprises a ball interposed between the spring unit and the valve body, 상기 스프링 유닛에는 상기 밸브 바디의 안착홈에 배치되는 원통형 지지대와 상기 원통형 지지대와 결합되어 상기 볼을 지지하는 스프링 판으로 이루어는 것을 특징으로 하는 전자제어식 브레이크 장치의 체크밸브.The spring unit is a check valve of the electronically controlled brake device, characterized in that made of a cylindrical support disposed in the seating groove of the valve body and a spring plate coupled to the cylindrical support to support the ball.
KR10-2004-0018013A 2004-03-17 2004-03-17 check valve of brake electronic control system KR100530033B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR10-2004-0018013A KR100530033B1 (en) 2004-03-17 2004-03-17 check valve of brake electronic control system

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Application Number Priority Date Filing Date Title
KR10-2004-0018013A KR100530033B1 (en) 2004-03-17 2004-03-17 check valve of brake electronic control system

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KR20050092891A KR20050092891A (en) 2005-09-23
KR100530033B1 true KR100530033B1 (en) 2005-11-21

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