KR20030067841A - Drum brake for vehicle - Google Patents

Drum brake for vehicle Download PDF

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Publication number
KR20030067841A
KR20030067841A KR1020020007316A KR20020007316A KR20030067841A KR 20030067841 A KR20030067841 A KR 20030067841A KR 1020020007316 A KR1020020007316 A KR 1020020007316A KR 20020007316 A KR20020007316 A KR 20020007316A KR 20030067841 A KR20030067841 A KR 20030067841A
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KR
South Korea
Prior art keywords
brake
drum
piston
sealing member
brake shoes
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Application number
KR1020020007316A
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Korean (ko)
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KR100779491B1 (en
Inventor
강정식
Original Assignee
주식회사 만도
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Priority to KR1020020007316A priority Critical patent/KR100779491B1/en
Publication of KR20030067841A publication Critical patent/KR20030067841A/en
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Publication of KR100779491B1 publication Critical patent/KR100779491B1/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
    • 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
    • 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
    • F16D2125/08—Seals, e.g. piston seals

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

Abstract

PURPOSE: A drum brake of a vehicle is provided to prevent wear or breakage of a sealing member against heat by restricting friction heat from being transmitted to the sealing member in braking with forming a heatproof ring. CONSTITUTION: A drum brake comprises a drum, a couple of brake shoes(30a,30b) installed inside the drum and contacted to the drum to generate braking force, a piston(42) installed between brake shoes to operate the brake shoes outward, and a wheel cylinder having a cylinder part(41) mounting the piston. The wheel cylinder includes a sealing member(44) preventing leak of brake oil between the outer periphery of the piston and the inner periphery of the cylinder part, and a heatproof ring(45) restricting heat from friction of the brake shoes and the drum from being transmitted to the sealing member in braking.

Description

차량용 드럼브레이크{Drum brake for vehicle}Drum brakes for vehicles {Drum brake for vehicle}

본 발명은 차량용 드럼브레이크에 관한 것으로, 더욱 상세하게는 휠실린더를 구비한 차량용 드럼브레이크에 관한 것이다.The present invention relates to a vehicle drum brake, and more particularly to a vehicle drum brake having a wheel cylinder.

일반적으로 차량용 드럼브레이크는 차량의 휠과 함께 회전하는 원통형 드럼의 내면에 라이닝이 부착된 브레이크슈를 강제로 밀착시켜 마찰력을 발생시키고, 이 마찰력을 통해 차량을 정지시키는 장치이다.In general, a vehicle drum brake is a device that generates friction by forcing a brake shoe with a lining to be in close contact with an inner surface of a cylindrical drum rotating together with a wheel of a vehicle, thereby generating a friction force and stopping the vehicle through the friction force.

차량용 드럼브레이크는 휠(미도시)과 함께 회전하는 드럼과, 드럼의 내측에 배치된 한 쌍의 반원 형상의 브레이크슈를 구비한다.The vehicle drum brake includes a drum that rotates together with a wheel (not shown) and a pair of semicircular brake shoes disposed inside the drum.

브레이크슈는 차량의 너클부에 고정된 백플레이트에 외향 작동 가능하게 장착되며, 그 외주상에는 드럼의 내면과 마찰하며 제동력을 발생시키는 라이닝이 부착되어 있다.The brake shoe is mounted to the back plate fixed to the knuckle portion of the vehicle so as to be outwardly operable, and on the outer circumference thereof is attached a lining that generates braking force and friction with the inner surface of the drum.

두 브레이크슈의 상단 사이에는 두 브레이크슈를 드럼의 내면 쪽으로 밀어서 드럼과 마찰되게 하는 휠실린더가 설치되며, 두 브레이크슈의 하단 사이에는 두 브레이크슈의 하단을 지지하는 앵커블록이 설치되어 있다.Wheel cylinders are provided between the upper ends of the two brake shoes to friction the drum by pushing the two brake shoes toward the inner surface of the drum. An anchor block supporting the lower ends of the two brake shoes is installed between the lower brake shoes.

이러한 차량용 드럼브레이크에 있어서, 도 1에 도시되어 있는 바와 같이 휠실린더(1)는 내부에 원통형상으로 형성된 실린더부(2)가 마련되어, 실린더부(2)에 마스터실린더(미도시)측으로부터 전달된 유압에 따라 진퇴이동하며 두 브레이크슈(5)를 외향작동시키는 한 쌍의 피스톤(3)이 대향되게 설치된다.In this vehicle drum brake, as shown in FIG. 1, the wheel cylinder 1 is provided with a cylinder portion 2 formed in a cylindrical shape therein, and is transferred to the cylinder portion 2 from a master cylinder side (not shown). A pair of pistons (3) for moving forward and backward in accordance with the hydraulic pressure is provided so as to operate the two brake shoes (5) outwards.

또한, 피스톤(3)에는 피스톤(3)과 실린더부(2) 사이를 통해 브레이크오일의 누설을 방지할 수 있도록 씰링부재(4)가 설치된다. 씰링부재(4)는 고무 등 탄성력을 갖는 재질로 이루어져 있으며, 대략 링형상으로 형성되어, 그 내측단이 피스톤(3)에 밀착 설치되고, 그 외측단이 실린더부(2)의 내주면에 밀착 설치되어, 피스톤(3)과 실린더부(2) 사이를 통해 브레이크오일이 누설되는 것을 방지할 수 있게 되는 것이다.In addition, the piston 3 is provided with a sealing member 4 to prevent leakage of the brake oil through the piston 3 and the cylinder portion (2). The sealing member 4 is made of a material having elastic force such as rubber, and is formed in a substantially ring shape, the inner end of which is in close contact with the piston 3, and the outer end of the sealing member 4 in close contact with the inner circumferential surface of the cylinder part 2. Thus, the brake oil can be prevented from leaking between the piston 3 and the cylinder portion 2.

그런데 이러한 차량용 드럼브레이크는, 급제동 등 비정상적인 제동을 수행할 경우, 브레이크슈(5)에 고온의 마찰열이 발생한다. 이러한 마찰열은 브레이크슈(5)와 접하고 있는 피스톤(3)을 통해 씰링부재(4)에 전달되어, 씰링부재(4)를 열팽창하게 한다. 씰링부재(4)가 팽창하면 씰링부재(4)와 실린더부(2)의 내주면 사이에 작용하는 마찰력이 커지게 되는데, 이러한 상태에서 다시 유압이 휠실린더(1)에 전달되면, 피스톤(3)의 이동이 씰링부재(4)와 실린더부(2) 사이에 작용하는 마찰력에 의해 방해를 받거나, 씰링부재(4)가 실린더부(2) 내주면과의 마찰에 의해 마모 또는 파손될 소지가 있다는 문제점이 있다.However, such a vehicle drum brake generates frictional heat of high temperature on the brake shoe 5 when abnormal braking such as rapid braking is performed. This frictional heat is transmitted to the sealing member 4 through the piston 3 in contact with the brake shoe 5, thereby causing the sealing member 4 to thermally expand. When the sealing member 4 expands, the friction force acting between the sealing member 4 and the inner circumferential surface of the cylinder part 2 increases, and in this state, when the hydraulic pressure is transmitted to the wheel cylinder 1 again, the piston 3 Movement of the sealing member 4 is hindered by the frictional force acting between the sealing member 4 and the cylinder portion 2, or the sealing member 4 may be worn or damaged by friction with the inner circumferential surface of the cylinder portion 2. have.

본 발명은 이와 같은 문제점을 해결하기 위한 것으로, 그 목적은 씰링부재가 제동시 발생하는 열에 의해 팽창하여, 마모 및 파손되는 것을 방지할 수 있는 차량용 드럼브레이크를 제공하는 것이다.The present invention is to solve such a problem, an object of the present invention is to provide a vehicle drum brake that can prevent the sealing member is expanded by the heat generated during braking, wear and breakage.

도 1은 종래의 차량용 드럼브레이크의 휠실린더가 도시된 단면도이다.1 is a cross-sectional view showing a wheel cylinder of a conventional vehicle drum brake.

도 2는 본 발명에 따른 차량용 드럼브레이크의 구성이 도시된 정면도이다.Figure 2 is a front view showing the configuration of a vehicle drum brake according to the present invention.

도 3은 본 발명에 따른 차량용 드럼브레이크 휠실린더의 분해사시도이다.3 is an exploded perspective view of a vehicle drum brake wheel cylinder according to the present invention.

도 4는 본 발명에 따른 차량용 드럼브레이크의 방열링의 설치구조를 보인 분해 사시도이다.Figure 4 is an exploded perspective view showing the installation structure of the heat dissipation ring of the vehicle drum brake according to the present invention.

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

10: 드럼 20: 백플레이트10: drum 20: backplate

30a, 30b: 브레이크슈40: 휠실린더30a, 30b: brake shoe 40: wheel cylinder

41: 피스톤42: 실린더부41: piston 42: cylinder portion

43: 코일스프링44: 씰링부재43: coil spring 44: sealing member

45: 방열링45: heat dissipation ring

이와 같은 목적을 달성하기 위한 본 발명은,The present invention for achieving such an object,

휠과 함께 회전하는 드럼과, 상기 드럼의 내면 양측에 설치되어 외향작동하며 상기 드럼의 내면과 마찰하여 제동력을 발생시키는 한 쌍의 브레이크슈와, 상기 한 쌍의 브레이크슈의 일단 사이에 설치되어 상기 한 쌍의 브레이크 슈를 외향작동시키는 피스톤과, 피스톤을 설치할 수 있도록 내부에 실린더부가 마련된 휠실린더를 구비한 차량용 드럼브레이크에 있어서, 상기 휠실린더는 상기 피스톤의 외주면과 상기 실린더부의 내주면 사이를 통한 브레이크오일의 누설을 방지하는 씰링부재와, 제동작용시 상기 브레이크슈와 상기 드럼 내주면의 마찰에 의해 발생한 마찰열이 상기 피스톤을 통해 상기 씰링부재로 전달되는 것을 방지하는 방열링을 구비한다.A drum which rotates together with a wheel, a pair of brake shoes which are installed on both sides of the inner surface of the drum to operate outward and generate a braking force by friction with the inner surface of the drum, and is installed between one end of the pair of brake shoes In a vehicle drum brake having a piston for outwardly operating a pair of brake shoes and a wheel cylinder having a cylinder portion provided therein for installing the piston, the wheel cylinder is braked between an outer circumferential surface of the piston and an inner circumferential surface of the cylinder portion. A sealing member for preventing the leakage of oil and a heat dissipation ring for preventing the frictional heat generated by the friction between the brake shoe and the drum inner peripheral surface during the braking action to be transmitted to the sealing member through the piston.

또한, 상기 피스톤에는 상기 씰링부재가 설치될 수 있도록 환형의 안착홈이 오목하게 마련되며, 상기 방열링은 링형상으로 형성되어 상기 안착홈에 상기 씰링부재와 나란히 설치되되, 상기 씰링부재의 상기 브레이크슈와 접하는 상기 피스톤 단부측에 설치된다.In addition, the piston is provided with a concave annular seating groove so that the sealing member can be installed, the heat dissipation ring is formed in a ring shape is installed side by side with the sealing member in the seating groove, the brake of the sealing member It is provided on the piston end side in contact with the shoe.

또한, 상기 방열링은 상기 안착홈에 용이하게 설치될 수 있도록 일측이 절개되어 있다.In addition, the heat dissipation ring is cut on one side so that it can be easily installed in the seating groove.

이하에서는 본 발명에 따른 바람직한 하나의 실시예를 도면을 참조하여 상세히 설명한다.Hereinafter, one preferred embodiment according to the present invention will be described in detail with reference to the drawings.

본 발명이 적용되는 차량용 드럼브레이크는 도 2에 도시되어 있는 바와 같이, 휠(미도시)과 함께 회전하는 드럼(10)과, 드럼(10)의 내면 양측에 반원형상으로 설치된 한 쌍의 브레이크슈(30a, 30b)를 포함한다.As shown in FIG. 2, a vehicle drum brake to which the present invention is applied includes a drum 10 rotating together with a wheel (not shown) and a pair of brake shoes installed in semicircular shapes on both sides of the inner surface of the drum 10. (30a, 30b).

두 브레이크슈(30a, 30b)는 차량의 너클부(미도시)에 고정된 백플레이트(20)에 외향작동 가능하도록 장착되어, 외향작동하며 드럼(10)의 내주면에 밀착되어 제동력을 발생시킬 수 있다. 또한, 브레이크슈(30a, 30b)는 드럼(10)의 내주면과 마찰하며 제동력을 발생시키는 라이닝(33a, 33b)이 외주면에 부착된 반원형상의 림(31a, 31b)과, 림(31a, 31b)의 내주면에 마련되어 림(31a, 31b)의 강성을 보강지지하는 웨브(32a, 32b)를 구비한다.The two brake shoes 30a and 30b are mounted to the back plate 20 fixed to the knuckle portion (not shown) of the vehicle so as to be outwardly operated, and outwardly acting to be in close contact with the inner circumferential surface of the drum 10 to generate braking force. have. In addition, the brake shoes 30a and 30b are semicircular rims 31a and 31b attached to the outer circumferential surface of which the linings 33a and 33b for friction with the inner circumferential surface of the drum 10 and generating braking force are attached to the outer circumferential surface. And webs 32a and 32b provided on the inner circumferential surface thereof to reinforce and support the rigidity of the rims 31a and 31b.

이러한 두 브레이크슈(30a, 30b)의 웨브(32a, 32b) 상단 사이에는 두 브레이크슈(30a, 30b)를 드럼(10)의 내면쪽으로 밀어서 제동력을 생성시키는 휠실린더(40)가 장착되며, 두 브레이크슈(30a, 30b)의 웨브(32a, 32b) 하단 사이에는 두 브레이크슈(30a, 30b)의 하단을 지지하는 앵커블록(50)이 설치되어, 휠실린더(40)에 의해 브레이크슈(30a, 30b)에 힘이 전달되며 앵커블록(50)을 중심으로 브레이크슈(30a, 30b)가 외향작동하며 드럼(10)과 마찰, 제동력을 발생시킬 수 있게 되어 있다.Between the upper ends of the webs 32a and 32b of the two brake shoes 30a and 30b, a wheel cylinder 40 is mounted to push the two brake shoes 30a and 30b toward the inner surface of the drum 10 to generate a braking force. An anchor block 50 for supporting the lower ends of the two brake shoes 30a and 30b is provided between the lower ends of the webs 32a and 32b of the brake shoes 30a and 30b, and the brake shoes 30a are provided by the wheel cylinder 40. The force is transmitted to the 30b, and the brake shoes 30a and 30b operate outwardly with respect to the anchor block 50 so as to generate friction and braking force with the drum 10.

휠실린더(40)에는, 도 3, 4에 도시되어 있는 바와 같이, 마스터실린더(미도시)로부터 전해진 유압에 따라 진퇴이동하는 피스톤(42)을 설치할 수 있도록 내부에 실린더부(41)가 마련된다. 피스톤(42)의 일측에는 브레이크슈(30a, 30b)의 웨브(32a, 32b) 일단을 지지하여 브레이크슈(30a, 30b)에 힘을 전달하는 지지부(42a)가 마련되어 있으며, 타측에는 코일스프링(43)을 설치할 수 있도록 볼록하게 형성된 설치돌기(42b)가 마련되어 있다.As shown in FIGS. 3 and 4, the wheel cylinder 40 is provided with a cylinder portion 41 therein so that the piston 42 which moves forward and backward in accordance with the hydraulic pressure transmitted from the master cylinder (not shown) can be installed. . One side of the piston 42 is provided with a support portion 42a for supporting one end of the webs 32a and 32b of the brake shoes 30a and 30b and transmitting a force to the brake shoes 30a and 30b. A convex installation protrusion 42b is provided to install 43).

피스톤(42)은 실린더부(41)에 한 쌍이 설치된다. 이 때, 두 피스톤(42)의 설치돌기(42b)는 서로 대향되게 설치되며, 두 설치돌기(42b) 사이에 코일스프링(43)이 구비되어 두 피스톤(42)이 실린더부(41) 내에서 상호지지되도록 되어 있다.The pair of piston 42 is provided in the cylinder part 41. At this time, the mounting protrusions 42b of the two pistons 42 are installed to face each other, and a coil spring 43 is provided between the two mounting protrusions 42b so that the two pistons 42 are in the cylinder portion 41. It is intended to be mutually supportive.

피스톤(42)에는 피스톤(42)의 외주면과 실린더부(41)의 내주면 사이를 통한 브레이크 오일의 누설을 방지하기 위한 링형상의 씰링부재(44)가 설치된다. 씰링부재(44)는 피스톤(42)의 진퇴이동시 피스톤(42)과 함께 진퇴이동하며 지속적으로 실린더부(41)의 내주면에 그 외주면이 밀착되어 있을 수 있도록 탄성재질인 고무로 이루어진다.The piston 42 is provided with a ring-shaped sealing member 44 for preventing leakage of brake oil between the outer circumferential surface of the piston 42 and the inner circumferential surface of the cylinder portion 41. Sealing member 44 is made of an elastic material rubber so that the outer circumferential surface is in close contact with the inner circumferential surface of the cylinder portion 41 and continuously moves with the piston 42 during the forward and backward movement of the piston 42.

한편 이러한 씰링부재(44)의 설치를 위해 피스톤(42)에는 환형의 안착홈(42c)이 오목하게 마련된다.Meanwhile, in order to install the sealing member 44, an annular mounting groove 42c is recessed in the piston 42.

따라서 씰링부재(44)의 내주면은 안착홈(42c)에 밀착되게 설치하고, 그 외주면은 실린더부(41)의 내주면에 밀착되도록 설치하면, 피스톤(42)과 실린더부(41)의 내주면 사이를 통하여 브레이크오일의 누설을 방지할 수 있게 되는 것이다.Therefore, when the inner circumferential surface of the sealing member 44 is installed to be in close contact with the seating groove 42c, and the outer circumferential surface is installed to be in close contact with the inner circumferential surface of the cylinder portion 41, a gap between the piston 42 and the inner circumferential surface of the cylinder portion 41 is established. Through this, the leakage of the brake oil can be prevented.

이러한 차량용 드럼브레이크에 있어서, 안착홈(42c)에는 링형상의 방열링(45)이 씰링부재(44)와 나란히 설치된다. 방열링(45)은 제동작용시 브레이크슈(30a, 30b)에서 발생한 열이 지지부(42a)를 통해 씰링부재(44)로 전달되는 것을 방지하기 위한 것으로, 씰링부재(44)의 지지부(42a)측 끝단과 접촉하도록 설치되어 씰링부재(44)의 지지부(42a)측 끝단이 방열링(45)을 통해 피스톤(42)에 간접지지될 수 있게 되어 있는 것이다.In such a vehicle drum brake, a ring-shaped heat dissipation ring 45 is installed in the seating groove 42c in parallel with the sealing member 44. The heat dissipation ring 45 is for preventing the heat generated from the brake shoes 30a and 30b from being transferred to the sealing member 44 through the support part 42a during the braking operation. The support part 42a of the sealing member 44 is provided. It is installed to be in contact with the side end so that the end of the supporting portion 42a side of the sealing member 44 can be indirectly supported by the piston 42 through the heat dissipation ring 45.

방열링(45)은 열전도율 및 열팽창율이 적은 재질로 이루어져 지지부(42a)를 통해 브레이크슈(30a, 30b)측으로부터 전해진 열을 차단할 수 있게 된다. 본 실시예에서 방열링(45)은 씰링부재(44)의 재질인 고무에 비하여 열전도율 및 열팽창율이 낮은 플라스틱 재질로 이루어져 있다.The heat dissipation ring 45 may be made of a material having a low thermal conductivity and a low thermal expansion rate to block heat transmitted from the brake shoes 30a and 30b through the support part 42a. In the present embodiment, the heat dissipation ring 45 is made of a plastic material having a low thermal conductivity and a thermal expansion rate compared to the rubber of the sealing member 44.

또한, 방열링(45)은 그 중도에 절단형성되는 절개부(45a)가 마련되어, 방열링(45)을 안착홈(42c)에 끼울 때, 절개부(45a)를 통해 방열링(45)을 벌려 안착홈(42c)에 용이하게 설치할 수 있게 되어 있다.In addition, the heat dissipation ring 45 is provided with a cutout portion 45a cut in the middle thereof, and when the heat dissipation ring 45 is inserted into the seating groove 42c, the heat dissipation ring 45 is opened through the cut portion 45a. It can be easily installed in the opening groove 42c.

다음은 이와 같이 구성된 본 발명에 따른 차량용 드럼브레이크의 작동 및 효과를 설명한다.The following describes the operation and effects of the vehicle drum brake according to the present invention configured as described above.

차량이 주행중인 상태에서 브레이크를 밟으면, 마스터실린더(미도시)에서 형성된 제동유압이 휠실린더(40)에 전해지고, 그에 따라 휠실린더(40) 내에 내장되어 있는 피스톤(42)이 실린더부(41) 내에서 전진하여 피스톤(42)의 양측에 설치되어 있는 두 브레이크슈(30a, 30b)의 상단을 외향작동시킨다. 그에 따라 브레이크슈(30a, 30b)에 부착된 라이닝(33a, 33b)이 드럼(10)과 마찰하며 제동력을 발생시킨다.When the brake is applied while the vehicle is running, the braking hydraulic pressure generated in the master cylinder (not shown) is transmitted to the wheel cylinder 40, whereby the piston 42 embedded in the wheel cylinder 40 has the cylinder portion 41. Advance inside, the upper ends of the two brake shoes 30a, 30b provided on both sides of the piston 42 are operated outwardly. Accordingly, the linings 33a and 33b attached to the brake shoes 30a and 30b rub against the drum 10 and generate braking force.

이러한 차량용 드럼브레이크의 제동작용에 있어서, 급제동 등 비정상적으로 제동작용을 수행할 경우, 브레이크슈(30a, 30b)에는 고온의 마찰열이 발생하며, 이러한 마찰열은 웨브(32a, 32b)를 통해 피스톤(42)에 전달된다. 이 때, 씰링부재(44)의 지지부(42a)측 끝단은 방열링(45)에 의해 간접적 피스톤(42)에 접촉되어 있으므로, 열의 전달이 방열링(45)에 의해 차단되어, 마찰열의 씰링부재(44)로의 전달은 저감된다.In the braking action of the vehicular drum brake, when abnormally braking action such as rapid braking is performed, high temperature frictional heat is generated in the brake shoes 30a and 30b, and the frictional heat is transmitted to the piston 42 through the webs 32a and 32b. Is delivered). At this time, since the end of the supporting portion 42a side of the sealing member 44 is in contact with the indirect piston 42 by the heat dissipation ring 45, heat transfer is interrupted by the heat dissipation ring 45, so that the sealing member of frictional heat is blocked. Delivery to 44 is reduced.

이상에서 상세히 설명한 바와 같이, 본 발명에 따른 차량용 드럼브레이크는, 씰링부재의 지지부측 끝단이 방열링에 의해 간접적으로 피스톤과 접하게 되어 있으므로, 제동시 발생하는 마찰열이 피스톤을 통해 전달되더라도, 방열링에 의해 씰링부재로의 열전달이 저감되어 씰링부재의 열팽창과 그에 따른 씰링부재의 마모 및 파손을 방지할 수 있게 되는 작용효과가 있다.As described in detail above, in the vehicle drum brake according to the present invention, since the end of the supporting part side of the sealing member is indirectly contacted with the piston by the heat dissipation ring, even if frictional heat generated during braking is transmitted through the piston, As a result, the heat transfer to the sealing member is reduced, so that the thermal expansion of the sealing member and the wear and damage of the sealing member can be prevented.

Claims (3)

휠과 함께 회전하는 드럼과, 상기 드럼의 내면 양측에 설치되어 외향작동하며 상기 드럼의 내면과 마찰하여 제동력을 발생시키는 한 쌍의 브레이크슈와, 상기 한 쌍의 브레이크슈의 일단 사이에 설치되어 상기 한 쌍의 브레이크 슈를 외향작동시키는 피스톤과, 피스톤을 설치할 수 있도록 내부에 실린더부가 마련된 휠실린더를 구비한 차량용 드럼브레이크에 있어서,A drum which rotates together with a wheel, a pair of brake shoes which are installed on both sides of the inner surface of the drum to operate outward and generate a braking force by friction with the inner surface of the drum, and is installed between one end of the pair of brake shoes In a vehicle drum brake having a piston for outwardly operating a pair of brake shoes and a wheel cylinder provided with a cylinder portion therein for installing the piston, 상기 휠실린더는 상기 피스톤의 외주면과 상기 실린더부의 내주면 사이를 통한 브레이크오일의 누설을 방지하는 씰링부재와, 제동작용시 상기 브레이크슈와 상기 드럼 내주면의 마찰에 의해 발생한 마찰열이 상기 피스톤을 통해 상기 씰링부재로 전달되는 것을 방지하는 방열링을 구비하는 것을 특징으로 하는 차량용 드럼브레이크.The wheel cylinder is a sealing member for preventing leakage of brake oil between the outer peripheral surface of the piston and the inner peripheral surface of the cylinder portion, and the frictional heat generated by the friction between the brake shoe and the drum inner peripheral surface during braking action the sealing through the piston A vehicle drum brake comprising a heat dissipation ring for preventing transmission to a member. 제 1항에 있어서,The method of claim 1, 상기 피스톤에는 상기 씰링부재가 설치될 수 있도록 환형의 안착홈이 오목하게 마련되며,The piston is provided with a concave annular mounting groove so that the sealing member can be installed, 상기 방열링은 링형상으로 형성되어 상기 안착홈에 상기 씰링부재와 나란히 설치되되, 상기 씰링부재의 상기 브레이크슈와 접하는 상기 피스톤의 단부측에 설치된 것을 특징으로 하는 차량용 드럼브레이크.The heat dissipation ring is formed in a ring shape is installed side by side with the sealing member in the seating groove, the vehicle drum brake, characterized in that installed on the end side of the piston in contact with the brake shoe of the sealing member. 제 1항에 있어서,The method of claim 1, 상기 방열링은 상기 안착홈에 용이하게 설치될 수 있도록 일측이 절개되어 있는 것을 특징으로 하는 차량용 드럼브레이크.The heat dissipation ring is a vehicle drum brake, characterized in that one side is cut so that it can be easily installed in the seating groove.
KR1020020007316A 2002-02-08 2002-02-08 Drum brake for vehicle KR100779491B1 (en)

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CN102155506A (en) * 2011-03-16 2011-08-17 湖南运达机械制造有限公司 Self-regulation clearance hydraulic drum-type front brake with temperature compensation function

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AUPP809399A0 (en) * 1999-01-11 1999-02-04 Britax Rainsfords Pty Ltd A mirror rotation mechanism

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Publication number Priority date Publication date Assignee Title
CN102155506A (en) * 2011-03-16 2011-08-17 湖南运达机械制造有限公司 Self-regulation clearance hydraulic drum-type front brake with temperature compensation function

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