KR100251361B1 - Drum brake for an automobile - Google Patents

Drum brake for an automobile Download PDF

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Publication number
KR100251361B1
KR100251361B1 KR1019960061818A KR19960061818A KR100251361B1 KR 100251361 B1 KR100251361 B1 KR 100251361B1 KR 1019960061818 A KR1019960061818 A KR 1019960061818A KR 19960061818 A KR19960061818 A KR 19960061818A KR 100251361 B1 KR100251361 B1 KR 100251361B1
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KR
South Korea
Prior art keywords
brake
drum
wheel cylinder
shoe
pair
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Application number
KR1019960061818A
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Korean (ko)
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KR19980043839A (en
Inventor
류현수
Original Assignee
정몽규
현대자동차주식회사
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Priority to KR1019960061818A priority Critical patent/KR100251361B1/en
Publication of KR19980043839A publication Critical patent/KR19980043839A/en
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Publication of KR100251361B1 publication Critical patent/KR100251361B1/en

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    • 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
    • F16D51/26—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 both extending in the same direction from their pivots
    • F16D51/30—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 both extending in the same direction 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
    • 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
    • F16D2125/06—Pistons

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

Abstract

PURPOSE: A brake of a drum type is provided to improve a brake function by supplying the same expansion force into a primary shoe and a secondary shoe. CONSTITUTION: A drum typed brake is braked by a pair of brake shoes pushed back by being face contacted with a slant unit(23a) of a pair of wedge members(23) through an extrusion performance of a wheel cylinder(22) mounted on a center of a back plate. In a case of stepping a brake pedal, a piston of the wheel cylinder is extruded to push the wedge member by receiving hydraulic pressure generated from a master cylinder. Then, a pair of brake shoes(26) and a stopper fixed by face contacting with the slant unit are pushed back toward outside, and attached to a drum and then, braked by a lining(28) as rub friction material. In a case of stepping out of the brake pedal, the wedge member moves to the center of the wheel cylinder by removing the hydraulic pressure from the wheel cylinder to release braking.

Description

자동차의 드럼식 브레이크Drum brakes

본 발명은 자동차의 리딩 트레일링 슈식 브레이크에 관한 것으로 특히 리딩슈에 비하여 드레일링슈의 제동력이 형저히 저하되는 것을 방지한 자동차의 드럼식 브레이크에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leading trailing shoe brake of an automobile, and more particularly, to a drum brake of an automobile which prevents the braking force of the derailing shoe from being lowered significantly compared to the leading shoe.

일반적으로, 자동차의 브레이크 장치에는 주행중에 주로 사용되는 푸트브레이크와, 자동차를 주차상태로 유지하기 위한 주차브레이크가 있으며, 푸트브레이크는 일반적으로 바퀴의 안쪽에 장치되어 있는 브레이크 드럼 또는 브레이크 디스크 등에 마찰재를 밀어 붙여 그 마찰력을 이용하여 제동력을 발생시키는 것으로 운전자가 브레이크페달을 밟음으로써 모든 바퀴에 제동력이 발생하도록 되어 있다.In general, a brake device of a vehicle includes a foot brake mainly used while driving, and a parking brake for keeping the vehicle parked. The foot brake generally includes a friction material such as a brake drum or a brake disc installed inside the wheel. The brake force is generated by pushing and applying the frictional force. The driver presses the brake pedal to generate braking force on all wheels.

상기한 푸트브레이크는 제동력을 발생하는 부분(본체)의 구조상으로 드럼식 브레이크와 디스크식 브레이크로 구분되어 지고, 상기한 드럼식 브레이크는 브레이크 슈의 장치법이나 휠 실린더의 구조등에 의해 리딩 트레일링 슈식이나 2리딩 슈식으로 구분된다.The foot brake is divided into a drum brake and a disk brake due to the structure of the part (main body) generating the braking force, and the drum brake is a leading trailing shoe type or two according to a brake shoe device method or a wheel cylinder structure. It is divided into leading shoe type.

제1도에 도시된 바와 같이, 도면에서 부호 10은 드럼식 브레이크의 리딩 트레일링 슈식을 나타낸 것이다.As shown in FIG. 1, reference numeral 10 in the drawing represents the leading trailing shoe of the drum brake.

상기 드럼식 브레이크(10)는 백플레이트(11)와, 상기 백플레이트(11)에 고정되어 내부에 2개의 피스톤이 마스터실린더로 부터 유압을 받아 한 쌍의 브레이크 슈(12)를 앵커핀(13)을 중심으로 좌우로 밀어 벌려서 외측의 드럼(14)에 압착하도록 작용하는 휠실린더(15)와, 상기 브레이크 슈(12)와 드럼(14)와의 사이에서 드럼 (14)과 직접 접촉하여 드럼(14)의 회전을 멈추게 하고 운동에너지를 열에어지로 바꾸는 마찰재인 브레이크 라이닝(16)과, 상기 한 쌍의 브레이크 슈(12)에 연결된 리턴스프링(17)으로 구성되어 있다.The drum-type brake 10 is fixed to the back plate 11 and the back plate 11 so that two pistons therein receive hydraulic pressure from the master cylinder, and the pair of brake shoes 12 are anchor pins 13. The wheel cylinder 15, which acts to press the drum 14 to the outside and presses the drum 14 to the outside, and the drum 14 is in direct contact with the drum 14 between the brake shoe 12 and the drum 14; Brake lining 16, which is a friction material that stops rotation of the < Desc / Clms Page number 6 > and converts kinetic energy into thermal air, and a return spring 17 connected to the pair of brake shoes 12.

제2도에 도시된 바와 같이, 상기 브레이크 드럼(14)이 화살표 방향으로 회전하는 경우, A의 슈를 프라이머리 슈, B의 슈를 세컨더리슈라고 부른다.As shown in FIG. 2, when the brake drum 14 rotates in the direction of the arrow, the shoe of A is called the primary shoe, and the shoe of B is called the secondary shoe.

브레이크 드럼(14)이 회전 중에 브레이크 슈(12)가 휠실린더(15)에 의해 드럼(14)에 밀어 붙여지면 마찰력에 의해 슈(12)는 드럼(14)과 함께 회전하려는 경향이 생기며, 이 때문에 프라이머리 슈(A)는 확장력(점선으로 표시)이 커진다. 이와 같은 작용을 '자기배력작용'이라고 한다.If the brake shoe 12 is pushed to the drum 14 by the wheel cylinder 15 while the brake drum 14 is rotating, the shoe 12 tends to rotate with the drum 14 due to the frictional force. As a result, the primary shoe A increases in extension force (indicated by dashed lines). This action is called 'self-force action'.

한편, 세컨더리 슈(B)는 마찰력에 의해 드럼(14)에서 떨어지려는 힘을 받아 확장력(점선으로 표시)은 감소하므로 상기 프라이머리 슈(A)는 세컨더리 슈(B)에 비하여 큰 제동력이 발생하게 된다.On the other hand, since the secondary shoe (B) receives the force to fall from the drum 14 by the friction force, the expansion force (indicated by the dashed line) is reduced, so that the primary shoe (A) generates a greater braking force than the secondary shoe (B). do.

그러나, 상기한 바와 같은 종래의 자동차의 드럼식 브레이크는 리딩 트레일링슈식 브레이크의 상기 프라이머리 슈(A)에 비하여 세컨더리 슈(B)의 확장력 차이에 따른 자기배력작용에 의하여 제동력이 현저히 저하되는 문제점이 있었다.However, the drum brake of the conventional vehicle as described above has a problem that the braking force is significantly reduced by the self-action action according to the expansion force difference of the secondary shoe (B) compared to the primary shoe (A) of the leading trailing shoe brake. there was.

따라서, 본 발명은 상기와 같은 문제점을 해결하기 위하여 안출된 것으로써, 본 발명의 목적은 프라이머리슈 및 세컨더리슈에 동일한 확장력을 갖도록 하여 제동성능을 향상시킨 자동차의 드럼식 브레이크를 제공하는 데 있다.Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide a drum type brake of a vehicle having improved braking performance by having the same expansion force on the primary shoe and the secondary shoe.

상기와 같은 목적을 실현하기 위하여 본 발명에 의한 자동차의 드럼식 브레이크는 백플레이트의 중심에 설치된 휠실린더의 압출작용에 의해 한쌍의 쐐기부재의 경사부와 면접촉되어 밀리는 한쌍의 브레이크슈에 의해 제동되는 것을 특징으로 한다.In order to achieve the above object, the drum brake of a vehicle according to the present invention is braked by a pair of brake shoes pushed in surface contact with the inclined portions of a pair of wedge members by an extrusion action of a wheel cylinder installed at a center of a back plate. It is characterized by.

제1도는 종래의 자동차의 드럼식 브레이크를 도시한 정단면도.1 is a front sectional view showing a drum brake of a conventional vehicle.

제2도는 종래의 브레이크 드럼의 회전에 따른 슈의 확장력분포를 나타낸 정면도.2 is a front view showing the expansion force distribution of the shoe according to the rotation of the conventional brake drum.

제3도는 본 발명에 의한 자동차의 드럼식 브레이크를 분해도시한 정면도이다.3 is an exploded front view of a drum brake of an automobile according to the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

20 : 드럼브레이크 21 : 백플레이트20: drum brake 21: back plate

22 : 휠실린더 23 : 쐐기부재22: wheel cylinder 23: wedge member

23a : 경사부 26 : 브레이크 슈23a: inclined portion 26: brake shoes

27 : 스토퍼 28 : 브레이크 라이닝27: stopper 28: brake lining

제3도는 본 발명에 의한 자동차의 드럼식 브레이크를 분해도시한 정면도를 나타낸 것이다.3 is an exploded front view of a drum brake of an automobile according to the present invention.

도면에서 부호 20은 백플레이트(21)의 중심에 설치된 휠실린더(22)의 압출작용에 의해 한쌍의 쐐기부재(23)의 경사부(23a)와 면접촉되어 밀리는 한쌍의 브레이크슈(26)에 의해 제동되는 드럼브레이크를 나타내고 있다.In the drawing, reference numeral 20 denotes a pair of brake shoes 26 which are pushed in surface contact with the inclined portions 23a of the pair of wedge members 23 by the extrusion action of the wheel cylinder 22 installed at the center of the back plate 21. It shows the drum brake braked by.

상기 드럼브레이크(20)는 백플레이트(21)와, 상기 백플레이트(21)의 중심부에 고정되어 내부에 2개의 피스톤이 마스터실린더로 부터 유압을 받아 양측으로 압출되는 휠실린더(22)와, 상기 휠실린더(22)의 양측에 설치되어 상기 휠실린더(22)의 압출작용에 의해 외측으로 밀리는 한쌍의 쐐기부재(23)와, 상기 한쌍의 쐐기부재(23)가 휠실린더(22)로 부터 압출될 때 쐐기부재(23)의 끝단 경사부(23a)의 이루는 각에 의해 앵커핀(24)를 중심으로 밀려서 외측의 드럼(25)에 압착되는 한쌍의 브레이크 슈(26)와, 상기 한쌍의 쐐기부재(23)의 일측에 고정된 스토퍼(27)와, 상기 브레이크 슈(26)와 드럼(25)와의 사이에서 드럼(25)과 직접 접촉하여 드럼(25)의 회전을 멈추게 하고 운동에너지를 열에너지로 바꾸는 마찰재인 브레이크 라이닝 (28)으로 구성되어 있다.The drum brake 20 is a back cylinder 21, a wheel cylinder 22 is fixed to the center of the back plate 21 and the two pistons therein are hydraulically received from the master cylinder and extruded to both sides, and the The pair of wedge members 23 installed on both sides of the wheel cylinder 22 and pushed out by the extrusion action of the wheel cylinder 22 and the pair of wedge members 23 are extruded from the wheel cylinder 22. A pair of brake shoes 26 which are pushed about the anchor pin 24 by the angle formed by the end inclined portion 23a of the wedge member 23 and pressed against the drum 25 on the outside, and the pair of wedges A stopper 27 fixed to one side of the member 23 and the brake shoe 26 and the drum 25 directly contact the drum 25 to stop the rotation of the drum 25 and generate kinetic energy. It consists of a brake lining 28 which is a friction material to be replaced with.

이때, 상기 브레이크 슈(26)의 앵커핀(24)의 반대측은 상기 한쌍의 쐐기부재 (23)의 경사부(23a)와 면접촉되면서 상기 앵커핀(24)를 중심으로 밀리도록 상기 경사부(23a)와 동일한 기울기를 형성하고, 또한, 상기 스토퍼(27)의 일측면은 상기 한쌍의 쐐기부재(23)의 경사부(23a)와 면접촉되면서 경사부(23a)의 일측이 밀리지 않도록 고정됨과 동시에 상기 경사부(23a)와 동일한 기울기를 형성하고 있다.At this time, the opposite side of the anchor pin 24 of the brake shoe 26 is in contact with the inclined portion (23a) of the pair of wedge member 23 and the inclined portion (20) to be pushed about the anchor pin (24) around the center ( The same slope as 23a is formed, and one side of the stopper 27 is fixed to prevent one side of the inclined portion 23a from being pushed while being in surface contact with the inclined portions 23a of the pair of wedge members 23. At the same time, the same slope as the inclined portion 23a is formed.

다음에, 본 발명의 작용에 대하여 설명한다.Next, the operation of the present invention will be described.

먼저, 도시되지 않은 브레이크페달을 밟으면, 마스터실린더(도시안됨)에서 발생된 유압을 받아 상기 휠실린더(22)의 피스톤(도시안됨)이 양측으로 압출되어 상기 쐐기부재(23)를 밀게되고, 이에 따라 쐐기부재(23)의 경사부(23a)와 면접촉되며 고정된 스토퍼(27)와 일측이 경사진 한쌍의 브레이크 슈(26)가 외측으로 밀리면서 드럼(25)과 압착되고 그 사이의 마찰재인 라이닝(28)에 의해 브레이킹된다.First, when the brake pedal (not shown) is pressed, the piston (not shown) of the wheel cylinder 22 is extruded to both sides to receive hydraulic pressure generated from the master cylinder (not shown), thereby pushing the wedge member 23. Accordingly, the stopper 27 which is in surface contact with the inclined portion 23a of the wedge member 23 and the pair of brake shoes 26 inclined on one side are pushed outward and pressed against the drum 25 and the friction material therebetween. Breaking by in-lining 28.

반대로, 브레이크 페달에서 발을 떼면, 상기 휠실린더(22)에서 유압이 제거됨에 따라 상기 한쌍의 쐐기부재(23)가 휠실린더(22)의 중심으로 이동되면서 브레이킹이 해제된다.On the contrary, when the foot is released from the brake pedal, as the hydraulic pressure is removed from the wheel cylinder 22, the pair of wedge members 23 are moved to the center of the wheel cylinder 22 to release the braking.

즉, 상기한 드럼 브레이크(20)가 제2도에서 표시된 바와 같이 반시계 방향으로 회전되고 있기 때문에, 상기한 휠 실린더(22)의 유압이 해제되면 브레이크 슈 (26)와 드럼(25)의 접촉 상태가 자연적으로 분리되어 브레이킹 상태가 해제되는 것이다.That is, since the drum brake 20 is rotated counterclockwise as shown in FIG. 2, when the hydraulic pressure of the wheel cylinder 22 is released, the brake shoe 26 contacts the drum 25. The state is naturally separated and the breaking state is released.

특히, 본원에서 종래 기술로 기재되어 있는, 브레이크 슈(26) 사이를 연결한 리턴 스프링(17)에 의해 상기한 브레이크 슈(26)가 항상 당겨지게 됨으로써, 상기한 드럼(25)과 브레이크 슈(26)의 접촉 상태가 용이하게 복귀되는 것이다.In particular, the brake shoe 26 is always pulled by the return spring 17 connecting between the brake shoes 26, which is described in the prior art herein, so that the drum 25 and the brake shoe ( The contact state of 26 is easily returned.

앞에서 설명한 바와 같이, 본 발명에 의한 자동차의 드럼식 브레이크에 의하면, 백플레이트의 중심에 설치된 휠실린더의 압출작용에 의해 한쌍의 쐐기부재의 경사부와 면접촉에의해 밀리면서 제동하는 한쌍의 브레이크슈로 구성되어 있으므로 프라이머리슈 및 세컨더리슈에 동일한 확장력에 의한 제동력이 향상되는 효과가 있다.As described above, according to the drum type brake of a vehicle according to the present invention, a pair of brake shoes are braked while being pushed by the inclined portion and the surface contact of the pair of wedge members by the extrusion action of the wheel cylinder installed in the center of the back plate. Since the primary shoe and the secondary shoe have the same expansion force, the braking force is improved.

Claims (1)

백 플레이트에 일단이 회전 가능하도록 앵커핀으로 설치되어 드럼과 밀착/이격되도록 구성된 브레이크 슈를 포함하는 자동차의 드럼식 브레이크에 있어서, 상기한 백 플레이트에 고정 설치됨과 아울러 상기한 브레이크 슈의 앵커핀 설치 대향단에 일정 간격으로 이격되어 있는 스토퍼와, 상기한 스토퍼와 브레이크 슈의 사이 간격으로 삽입/이탈되면서 쐐기형상 경사부로 브레이크 슈를 드럼에 점차적으로 밀착시키도록 구성되고 백 플레이트의 중심 부분에 고정된 휠 실린더에 의해 작동하는 쐐기 부재를 포함함을 특징으로 하는 자동차의 드럼식 브레이크.In a drum brake of a vehicle including a brake shoe, one end of which is mounted to the back plate to be rotatable, and configured to be in close contact with the drum, the anchor pin mounting stand of the brake shoe is fixed to the back plate. A stopper spaced at regular intervals at each end and a wheel fixed to the central portion of the back plate and configured to gradually adhere the brake shoe to the drum with a wedge-shaped slope while being inserted / detached at the interval between the stopper and the brake shoe. A drum brake of a motor vehicle comprising a wedge member actuated by a cylinder.
KR1019960061818A 1996-12-05 1996-12-05 Drum brake for an automobile KR100251361B1 (en)

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