KR200160300Y1 - Wheel cylinder for drum brake - Google Patents

Wheel cylinder for drum brake Download PDF

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Publication number
KR200160300Y1
KR200160300Y1 KR2019960052571U KR19960052571U KR200160300Y1 KR 200160300 Y1 KR200160300 Y1 KR 200160300Y1 KR 2019960052571 U KR2019960052571 U KR 2019960052571U KR 19960052571 U KR19960052571 U KR 19960052571U KR 200160300 Y1 KR200160300 Y1 KR 200160300Y1
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KR
South Korea
Prior art keywords
piston
installation groove
coupling shaft
piston head
drum brake
Prior art date
Application number
KR2019960052571U
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Korean (ko)
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KR19980039500U (en
Inventor
이정은
Original Assignee
김승신
와브코코리아인크., 한국지점
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Application filed by 김승신, 와브코코리아인크., 한국지점 filed Critical 김승신
Priority to KR2019960052571U priority Critical patent/KR200160300Y1/en
Publication of KR19980039500U publication Critical patent/KR19980039500U/en
Application granted granted Critical
Publication of KR200160300Y1 publication Critical patent/KR200160300Y1/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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
    • F16D65/22—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for pressing members apart, e.g. for drum brakes
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D51/00—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like
    • F16D51/16—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis
    • F16D51/18—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes
    • F16D51/20—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes extending in opposite directions from their pivots
    • F16D51/24—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes extending in opposite directions from their pivots fluid actuated
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/02—Fluid pressure
    • F16D2121/04—Fluid pressure acting on a piston-type actuator, e.g. for liquid pressure
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/02—Fluid-pressure mechanisms
    • F16D2125/04—Cylinders

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)

Abstract

본 고안은 드럼브레이크의 휠실린더에 관한 것으로, 그 목적은 피스톤의 선단부에 결합되는 피스톤헤드의 구조를 개선하여 드럼브레이크의 조립과정에서 이탈을 방지하는 것이다.The present invention relates to a wheel cylinder of a drum brake, the purpose of which is to improve the structure of the piston head coupled to the front end of the piston to prevent the departure during the assembly process of the drum brake.

본 고안에 따른 드럼브레이크의 휠실린더는 피스톤(300)의 선단부에 형성된 설치홈(310)에 내곡된 환형홈(311)을 구성하며, 설치홈(310)에 삽입결합되는 피스톤헤드(500)의 결합축(510)에 돌기부(511)를 환형홈(311)과 상응한 위치에 형성하여 강제로 압입하였다. 따라서 피스톤헤드(500)의 결합축(510)이 설치홈(310) 내부에서 슬라이딩가능하며 쉽게 이탈되는 것이 방지되어 드럼브레이크의 조립이 용이한 이점이 있다.The wheel cylinder of the drum brake according to the present invention constitutes an annular groove 311 that is bent in the installation groove 310 formed at the tip of the piston 300, and of the piston head 500 inserted into the installation groove 310. Protruding portion 511 was formed in the coupling shaft 510 at a position corresponding to the annular groove 311 to be forced in. Accordingly, the coupling shaft 510 of the piston head 500 is slidable in the installation groove 310 and is easily prevented from being separated, thereby facilitating the assembly of the drum brake.

Description

드럼브레이크의 휠실린더Wheel Cylinder of Drum Brake

본 고안은 드럼브레이크의 휠실린더에 관한 것으로, 더 상세하게는 피스톤의 선단부에 마련되어 브레이크슈와 결합되는 피스톤헤드에 관한 것이다.The present invention relates to a wheel cylinder of a drum brake, and more particularly, to a piston head provided at the front end of the piston and coupled to the brake shoe.

일반적으로 차량에 장착되는 브레이크는 주행중의 자동차를 감속하거나 정지 또는 정지 상태를 유지하기 위한 것으로, 디스크식 유압 브레이크와 드럼식 유압 브레이크 등이 있다. 이 드럼식 유압 브레이크는 디스크 대신에 휠과 함께 회전하는 원통형의 드럼을 그 내부에서 라이닝과 마찰시켜 제동력을 얻는 것으로, 휠실린더를 이용하여 브레이크슈를 외향작동시킴으로써, 제동력을 발생하는 것이다.In general, a brake mounted on a vehicle is used to decelerate a vehicle while driving or to maintain a stopped or stopped state, and includes a disc hydraulic brake and a drum hydraulic brake. The drum-type hydraulic brake obtains a braking force by rubbing a cylindrical drum that rotates with the wheel instead of the disc and lining therein, and generates a braking force by operating the brake shoe outwardly using a wheel cylinder.

이러한 기능을 하는 휠실린더는 도 1에 도시한 바와 같이, 몸체를 이루는 실린더하우징(10)에 양부가 개방된 실린더실(20)이 형성되어 있고, 여기에는 전달되는 유압에 의해 진퇴운동하는 피스톤(30,30')이 양부에 각각 마련된다. 이 때, 일측의 피스톤(30)은 전방브레이크슈(1)와 접하도록 구성되고, 타측의 피스톤(30')은 후방브레이크슈(3)와 접하도록 구성되어 있다. 그리고 일측의 피스톤(30) 내부에는 어져스트부(60)가 구성되어 있는데, 이것은 브레이크슈(1,3)의 외주면에 부착된 라이닝(2,4)이 계속적인 제동작용에 따라 마모되어 드럼(5) 내주면과 이격이 커지는 것을 보상한다. 미설명부호 40은 실린더실(10)내부로 이물질이 유입되는 것을 방지하는 부우트이다.As shown in FIG. 1, a wheel cylinder having such a function is provided with a cylinder chamber 20 having both parts open in a cylinder housing 10 constituting a body, and a piston which moves forward and backward by hydraulic pressure transmitted thereto. 30, 30 ') are provided on each side. At this time, the piston 30 on one side is configured to contact the front brake shoe 1, and the piston 30 'on the other side is configured to contact the rear brake shoe 3. And the inside of the piston 30 of the one side is composed of the adjuster 60, which is worn by the continuous braking action lining (2, 4) attached to the outer peripheral surface of the brake shoes (1, 3) drum ( 5) Compensate for the separation from the inner circumference. Reference numeral 40 is a boolean for preventing foreign matter from entering the cylinder chamber (10).

또한, 일측의 피스톤(30) 선단부에는 전방브레이크슈(1)와의 체결을 위한 피스톤헤드(50)가 마련되어 있는데, 이의 설치구조는 다음과 같다. 먼저, 일측 피스톤(30)의 선단 중심부에는 축방향으로 내곡된 설치홈(31)이 형성되어 있다. 그리고 피스톤헤드(50)의 일측부에는 설치홈(31)에 슬라이딩가능하게 삽입결합되는 결합축(51)이 형성되어 있고 타측부에는 전방브레이크슈(1)의 일단부가 결합되는 체결홈(52)이 형성되어 있다. 따라서 피스톤헤드(50)가 어져스트부(60)가 마련된 피스톤(30) 선단부에 슬라이딩 가능하게 결합되어 전방브레이크슈(1)와의 체결이 용이하도록 구성되어 있다.In addition, a piston head 50 for fastening with the front brake shoe 1 is provided at the front end of the piston 30 on one side, and its installation structure is as follows. First, the installation groove 31 curved in the axial direction is formed in the front end center of the one side piston (30). And one side of the piston head 50 is formed with a coupling shaft 51 is slidably inserted into the installation groove 31, the other side of the coupling groove 52 is coupled to one end of the front brake shoe (1) Is formed. Therefore, the piston head 50 is slidably coupled to the front end of the piston 30 having the adjuster 60, and is configured to be easily fastened with the front brake shoe 1.

이와 같이 구성된 드럼브레이크의 휠실린더를 갖춘 자동차가 전진하고 있는 상태에서 운전자가 브레이크패달(미도시)을 밟게 되면, 마스터실린더(미도시)에서 배력이 발생하여 이 유압이 휠실린더의 실린더실(20)로 전달된다. 그리고 유압에 의해 각 피스톤(30,30')이 외부로 전진하게 되어 반원형상의 전방브레이크슈(1)와 후방브레이크슈(3)를 각각 외향으로 밀어줌으로써, 이의 외주면에 부착된 라이닝(2,4)이 휠(미도시)과 함께 회전하는 브레이크드럼(5)의 내주면과 마찰하여 제동작용을 하게 된다. 즉, 실린더하우징(10)의 내부에 마련된 피스톤(30,30')이 브레이크슈(1,3)를 밀어 제동작용을 한다.When the driver presses a brake pedal (not shown) while the vehicle having the wheel brake wheel configured as described above is advanced, the hydraulic power is generated in the master cylinder (not shown), and the hydraulic pressure is applied to the cylinder chamber of the wheel cylinder (20). Is delivered. Then, the pistons 30 and 30 'are moved outward by the hydraulic pressure, and the semi-circular front brake shoe 1 and the rear brake shoe 3 are pushed outwards, thereby linings 2 and 4 attached to the outer circumferential surface thereof. ) Is friction with the inner circumferential surface of the brake drum (5) to rotate with the wheel (not shown) to perform a braking action. That is, the pistons 30 and 30 'provided in the cylinder housing 10 push the brake shoes 1 and 3 to brake.

그러나 이러한 종래의 휠실린더는 일측의 피스톤(30) 선단부에 마련된 피스톤헤드(50)가 드럼브레이크의 조립시 쉽게 빠지게 되어 조립성이 저하되는 문제점이 있다. 즉, 일단부에 결합축(51)이 구성되고 타단부에 전방브레이크슈(1)의 일단부와 결합되는 피스톤헤드(50)는 이의 결합축(51)이 일측 피스톤(30) 선단부의 설치홈(31)에 슬라이딩가능하게 결합되는데, 별도의 이탈방지부재가 없기 때문에 조립과정에서 쉽게 이탈됨으로써, 조립성을 저하시키게 된다.However, such a conventional wheel cylinder has a problem in that the piston head 50 provided at the front end of the piston 30 is easily detached when the drum brake is assembled, thereby degrading the assemblability. In other words, the coupling shaft 51 is formed at one end and the piston head 50 coupled to the one end of the front brake shoe 1 at the other end thereof has the coupling shaft 51 at one end of the piston 30 installed therein. It is slidably coupled to the (31), because there is no separate departure prevention member is easily separated in the assembly process, thereby reducing the assembly.

본 고안은 이러한 문제점을 해결하기 위한 것으로, 본 고안의 목적은 피스톤의 선단부에 형성된 설치홈에 내곡된 환형홈을 구성하며, 설치홈에 삽입결합되는 피스톤헤드의 결합축에 돌기부를 환형홈과 상응한 위치에 형성하여 강제로 압입함으로써, 피스톤헤드의 결합축이 설치홈 내부에서 슬라이딩가능하며 쉽게 이탈되는 것을 방지하는 드럼브레이크의 휠실린더를 제공하는 것이다.The present invention is to solve this problem, the object of the present invention is to form an annular groove that is bent in the installation groove formed in the front end of the piston, the projection on the coupling shaft of the piston head inserted into the installation groove corresponding to the annular groove It is to provide a wheel cylinder of the drum brake that is formed in one position and forcibly press-fitted, the coupling shaft of the piston head is slidable inside the installation groove and is prevented from being easily separated.

도 1은 일반적인 드럼브레이크의 휠실린더를 보인 단면도이다.1 is a cross-sectional view showing a wheel cylinder of a general drum brake.

도 2는 본 고안에 따른 드럼브레이크의 휠실린더를 보인 단면도이다.Figure 2 is a cross-sectional view showing a wheel cylinder of the drum brake according to the present invention.

도 3은 본 고안에 따른 피스톤헤드의 확대단면도이다.3 is an enlarged cross-sectional view of a piston head according to the present invention.

*도면의 주요부분에 대한 부호 설명** Description of symbols on the main parts of the drawings *

100..실린더하우징 200..실린더실 300..피스톤100. Cylinder housing 200. Cylinder chamber 300. Piston

310..설치홈 311..환형홈 500..피스톤헤드310. Installation groove 311. Annular groove 500. Piston head

510..결합축 511..돌기부510. Coupling shaft 511. Protrusion

이러한 목적을 달성하기 위한 본 고안은, 내부에 실린더실이 형성된 실린더하우징, 실린더실에 마련되어 유압에 의해 진퇴운동하는 피스톤, 피스톤의 선단부에 축방향으로 형성된 설치홈에 일단부가 슬라이딩가능하게 삽입결합되고 타단부가 브레이크슈와 결합되어 제동시 피스톤과 일체로 전진하여 브레이크슈를 외향 작동시키는 피스톤헤드를 갖춘 드럼브레이크의 휠실린더에 있어서, 설치홈의 내주면에는 내곡된 환형홈이 형성되고, 피스톤헤드의 일단부에는 설치홈에 삽입결합되는 결합축, 결합축의 외주면에 형성되어 환형홈에서 슬라이딩가능하게 결합되며 설치홈에서 결합축이 이탈되는 것을 방지하는 돌기부가 마련되는 것을 특징으로 한다.The present invention for achieving the above object, the cylinder housing is formed in the cylinder chamber, the piston provided in the cylinder chamber to move back and forth by hydraulic pressure, one end is slidably inserted into the installation groove formed in the axial direction to the front end of the piston In a wheel cylinder of a drum brake having a piston head of which the other end is combined with a brake shoe and moves forward integrally with the piston when braking to operate the brake shoe outwardly, an inner circumferential surface of the installation groove is formed with a curved annular groove. One end of the coupling shaft is inserted into the installation groove, is formed on the outer peripheral surface of the coupling shaft is slidably coupled in the annular groove, characterized in that the projection is provided to prevent the coupling shaft from being separated from the installation groove.

이하, 본 고안에 따른 하나의 바람직한 실시예를 첨부도면을 참조하여 상세히 설명한다. 도 2는 본 고안에 따른 드럼브레이크의 휠실린더를 개략적으로 도시한 것이고, 도 3은 본 고안의 요부확대도로 피스톤헤드부를 보인 것이다.Hereinafter, one preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings. Figure 2 schematically shows a wheel cylinder of the drum brake according to the present invention, Figure 3 is an enlarged view of the main portion of the piston head of the present invention.

본 고안에 따른 드럼브레이크의 휠실린더는 이에 도시한 바와 같이, 라이닝(2,4)이 부착된 전방브레이크슈(1)와 후방브레이크슈(3) 사이에 설치되어 있는데, 외형 몸체를 이루는 실린더하우징(100)의 내부에 양부가 개방된 실린더실(200)이 형성되어 있으며, 여기에는 일단부가 개방부를 통해 외부로 노출된 피스톤(300,300')이 양부에 각각 구성되어 유압에 의해 진퇴운동하게 된다.The wheel cylinder of the drum brake according to the present invention is installed between the front brake shoe 1 and the rear brake shoe 3 to which the linings 2 and 4 are attached, and the cylinder housing forming the outer body. The cylinder chamber 200 having both parts open is formed in the interior of the part 100, and one end portion of the pistons 300 and 300 ′ exposed to the outside through the opening part are respectively configured on both sides to move forward and backward by hydraulic pressure.

한편, 내부에 어져스트부(600)가 구성된 일측의 피스톤(300) 선단부에는 본 고안의 특징적인 요소로 피스톤헤드(500)가 이탈방지수단에 의해 결합되어 전방브레이크슈(1)의 일단부와 접하도록 구성되어 있는데, 이의 구조는 다음과 같다. 먼저, 피스톤(300) 선단부에는 축방향으로 설치홈(310)에 형성되어 있으며, 이의 내주면에는 소정깊이로 내곡되게 환형홈(311)이 이루어져 있다. 그리고 피스톤헤드(500)의 일단부에는 설치홈(310)에 삽입결합되는 결합축(510)이 구성되어 있고 타단부에는 전방브레이크슈(1)와 결합되는 체결홈(520)이 형성되어 있는데, 결합축(510)의 외주면에는 이탈방지수단으로 설치홈(310)의 직경보다 약간 크게 외부로 돌출된 돌기부(511)가 형성되어 있다. 따라서 환형홈(311)에 돌기부(511)가 결합될 때까지 설치홈(310)에 피스톤헤드(500)의 결합축(510)을 강제로 압입하면, 결합축(510)은 설치홈(310)에서 슬라이딩 가능하게 되며 또한 환형홈(311)에 돌기부(511)가 끼워지기 때문에 이의 이탈이 쉽지 않도록 구성되어 있다. 미설명부호 400은 이물질의 유입을 방지하는 부우트이다.On the other hand, one end of the piston 300, which is a characteristic element of the present invention is coupled to the front end of the piston (500) as a characteristic element of the present invention to the front end of the front brake shoe (1) It is configured to be touched, and its structure is as follows. First, the front end of the piston 300 is formed in the installation groove 310 in the axial direction, the inner circumferential surface thereof has an annular groove 311 to be curved to a predetermined depth. And one end of the piston head 500 is formed with a coupling shaft 510 is inserted into the installation groove 310 and the other end is formed with a fastening groove 520 is coupled to the front brake shoe (1), On the outer circumferential surface of the coupling shaft 510 is formed a protrusion 511 projecting outwardly larger than the diameter of the installation groove 310 as a separation prevention means. Accordingly, when the projection shaft 511 is forcibly pressed into the coupling shaft 510 of the piston head 500 into the installation groove 310 until the protrusion 511 is coupled to the annular groove 311, the coupling shaft 510 is installed groove 310. In the sliding is also possible because the projection 511 is fitted in the annular groove (311) is configured so that its separation is not easy. Reference numeral 400 is a boolean that prevents the entry of foreign matter.

이와 같이 구성된 본 고안에 따른 휠실린더의 제동시 일반적인 작동은 종래와 동일하기 때문에 이에 대한 설명은 생략하고, 본 고안의 특징적 요소인 피스톤과 피스톤헤드의 체결구조를 다시 한 번 서술하면 다음과 같다.Since the general operation during braking of the wheel cylinder according to the present invention configured as described above is the same as in the prior art, the description thereof is omitted, and once again the fastening structure of the piston and the piston head, which is a characteristic element of the present invention, is described as follows.

먼저, 일측 피스톤(300)의 선단부에는 내주면에 환형홈(311)이 형성된 설치홈(310)이 축방향으로 형성되어 있고, 설치홈(310)에 여유있게 삽입되는 피스톤헤드(500)의 결합축(510) 외주면에는 돌기부(511)가 돌출되어 있다. 따라서 돌기부(511)가 환형홈(311)에 삽입될 때까지 압입하면, 결합축(510)은 설치홈(310)에서 슬라이딩가능하게 결합되며, 또한 돌기부(511)에 의해 결합축(510)이 설치홈(310)에서 이탈되지 않음으로써, 드럼브레이크의 조립이 용이하게 된다.First, an installation groove 310 having an annular groove 311 formed on an inner circumferential surface thereof is formed in the axial direction at a distal end of one side piston 300, and a coupling shaft of the piston head 500 is inserted into the installation groove 310 in a relaxed manner. Protrusions 511 protrude from the outer circumferential surface. Therefore, when the protrusion 511 is press-fitted to be inserted into the annular groove 311, the coupling shaft 510 is slidably coupled in the installation groove 310, and also the coupling shaft 510 by the protrusion 511 By not being separated from the installation groove 310, the assembly of the drum brake is easy.

한편, 피스톤헤드(500)를 강제로 당기게 되면, 피스톤(300)의 환형홈(311)에서 돌기부(511)가 빠지게 되어 결합축(510)의 분리가 가능하다.On the other hand, when the piston head 500 is forcibly pulled out, the protrusion 511 is removed from the annular groove 311 of the piston 300, so that the coupling shaft 510 can be separated.

이상에서 상세히 설명한 바와 같이, 본 고안에 따른 드럼브레이크의 휠실린더는 피스톤의 선단부에 형성된 설치홈에 내곡된 환형홈을 구성하며, 설치홈에 삽입결합되는 피스톤헤드의 결합축에 돌기부를 환형홈과 상응한 위치에 형성하여 강제로 압입하였다. 따라서 피스톤헤드의 결합축이 설치홈내부에서 슬라이딩가능하며 쉽게 이탈되는 것이 방지되어 드럼브레이크의 조립이 용이한 이점이 있다.As described in detail above, the wheel cylinder of the drum brake according to the present invention constitutes an annular groove formed in the installation groove formed in the distal end of the piston, and the projection on the coupling shaft of the piston head inserted into the installation groove and the annular groove Formed at the corresponding position and forced indentation. Therefore, the coupling shaft of the piston head is slidable in the installation groove and is easily prevented from being separated, so there is an advantage of easy assembly of the drum brake.

Claims (1)

내부에 실린더실(200)이 형성된 실린더하우징(100), 상기 실린더실(200)에 마련되어 유압에 의해 진퇴운동하는 피스톤(300), 상기 피스톤(300)의 선단부에 축방향으로 형성된 설치홈(310)에 일단부가 슬라이딩가능하게 삽입결합되고 타단부가 브레이크슈(1)와 결합되어 제동시 상기 피스톤(300)과 일체로 전진하여 상기 브레이크슈(1)를 외향 작동시키는 피스톤헤드(500)를 갖춘 드럼브레이크의 휠실린더에 있어서, 상기 설치홈(310)의 내주면에는 내곡된 환형홈(311)이 형성되고, 상기 피스톤헤드(500)의 일단부에는 상기 설치홈(310)에 삽입결합되는 결합축(510), 상기 결합축(510)의 외주면에 형성되어 상기 환형홈(311)에서 슬라이딩가능하게 결합되며 상기 설치홈(310)에서 상기 결합축(510)이 이탈되는 것을 방지하는 돌기부(511)가 마련되는 것을 특징으로 하는 드럼브레이크의 휠실린더.A cylinder housing 100 having a cylinder chamber 200 formed therein, a piston 300 provided in the cylinder chamber 200 to move forward and backward by hydraulic pressure, and an installation groove 310 formed in an axial direction at a tip end of the piston 300. One end is slidably inserted into the other end and the other end is coupled to the brake shoe (1) having a piston head (500) for advancing integrally with the piston (300) for braking (1) outward operation In the wheel cylinder of the drum brake, a curved annular groove 311 is formed on the inner circumferential surface of the installation groove 310, and a coupling shaft inserted into and coupled to the installation groove 310 at one end of the piston head 500. 510, a protrusion 511 formed on an outer circumferential surface of the coupling shaft 510 to be slidably coupled to the annular groove 311 and preventing the coupling shaft 510 from being separated from the installation groove 310. Drum which is characterized in that is provided Wheel cylinders of the microphone.
KR2019960052571U 1996-12-20 1996-12-20 Wheel cylinder for drum brake KR200160300Y1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2019960052571U KR200160300Y1 (en) 1996-12-20 1996-12-20 Wheel cylinder for drum brake

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Application Number Priority Date Filing Date Title
KR2019960052571U KR200160300Y1 (en) 1996-12-20 1996-12-20 Wheel cylinder for drum brake

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KR19980039500U KR19980039500U (en) 1998-09-15
KR200160300Y1 true KR200160300Y1 (en) 1999-11-01

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KR102218190B1 (en) * 2019-08-09 2021-02-23 (주)진합 Piston structure for electronic drum brake

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