• 제목/요약/키워드: Ventilated disc brake

검색결과 17건 처리시간 0.024초

제동시간이 통풍형 디스크 브레이크 시스템의 건전성에 미치는 영향 (Influence of the Braking Time on the Soundness of Ventilated Disc Brake Systems)

  • 곽우경;홍창기;김윤제
    • 자동차안전학회지
    • /
    • 제8권1호
    • /
    • pp.7-12
    • /
    • 2016
  • In order to analyze the soundness of ventilated disc brake systems, numerical study was performed with various vane shapes. In particular, two different vane type, and the braking time from 3.0 s to 4.5s with the interval of 0.5s were considered. Transient temperature distributions on the ventilated disc brake assembly were calculated using ANSYS CFX ver. 16.1. To elucidate the soundness of ventilated disc brake systems, moreover, the heat transfer coefficients were evaluated. Results were graphically depicted with different geometrical vane configurations and braking time.

중형 상용차 통풍형 브레이크 디스크의 제동 시 열 유동 및 변형 해석 (Thermal Fluid Flow and Deformation Analysis of Medium Commercial Vehicle Ventilated Brake Disc in Braking)

  • 강채욱;최규재
    • 한국자동차공학회논문집
    • /
    • 제22권7호
    • /
    • pp.63-69
    • /
    • 2014
  • Domestic automobile companies have adopted drum type brake system for commercial vehicles. However recently those companies have been applying disc-brake system to solve vehicle control-instability and inefficient heat discharge performance of conventional drum brake system for a medium commercial vehicle. Because the kinetic energy of a running commercial vehicle is relatively high, the brake system should discharge lots of heat energy while braking. A ventilated type brake disc has been used to increase heat discharge performance of a brake system. The vent structure of a disc highly affects cooling efficiency. This paper compares thermal characteristics of three types of vent structure in JASO C421 braking condition. It is found that the slant bend type disc has the lowest temperature and thermal stress distributions in the braking condition.

3차원 열-기계 커플링 모델에 의한 벤틸레이티드 디스크-패드 브레이크의 온도 분포와 접촉 압력에 관한 연구 (A Study on Temperature Field and Contact Pressure in Ventilated Disc-Pad Brake by 3D Thermo-mechanical Coupling Model)

  • 황평;서희창;우쉔
    • Tribology and Lubricants
    • /
    • 제25권6호
    • /
    • pp.421-426
    • /
    • 2009
  • The brake system is important part of automobile safety system. The disc brake system is divided two parts: the rotating axisymmetrical disc and the stationary pads. During braking, the kinetic energy and potential energy of moving vehicle were converted into the thermal energy through frictional heat between the brake disc and the pads. The frictional heat, which is generated on the interface of the disc and pads, can cause high temperature during the braking process. The object of present work is to determine temperature and thermal stress, to compare to simulation results and experimental results in the disc by partial 3D model of ventilated disc brake with appropriate boundary conditions. In the simulation process, the mechanical loads were applied to the thermo-mechanical coupling analysis in order to simulate the process of heat produced by friction.

벤틸레이티드 디스크 브레이크의 열응력 해석 (Thermal Stress Analysis of Ventilated Disc Brake)

  • 김양술;안수철
    • 한국안전학회지
    • /
    • 제23권3호
    • /
    • pp.25-29
    • /
    • 2008
  • In automotive disc brake system, friction heat is not uniformly distributed due to various reasons such as thermal expansion and imperfections in geometry. It is well known that thermoelastic distortion due to fictional heating affects the contact pressure distribution and can lead to thermoelastic instability, where the contact load is concentrated in one or more small regions on the brake disc surface. These regions then take very high temperatures and passage of hot spots moving under the brake pads can cause low frequency vibration called brake judder. This paper presents the FEM(finite element method) result for the temperature distribution of ventilated disc brake. A steady state two-dimensional model of disc brake system predicts the surface temperatures during a multi-stop driving schedule.

반 실린더형 홈을 가진 벤틸레이티드 디스크 브레이크에서의 국소열전달 측정 및 수치 해석 (Local Heat Transfer Measurement and Numerical Analysis in the Ventilated Disc Brake with Semi-Cylindrical Grooves)

  • 이대희;박성봉;임창율;김흥섭;이관수
    • 대한기계학회논문집B
    • /
    • 제30권6호
    • /
    • pp.587-593
    • /
    • 2006
  • A ventilated disc brake having semi-cylindrical grooves has been proposed to improve the thermal judder by way of heat transfer enhancement. The local heat transfer coefficients were measured in the flow passage of disc brake. These measured local heat transfer data were utilized to do the finite element numerical analysis which predicts the maximum temperatures on the disc brake. The results show that the maximum temperatures on the disc surface with semi-cylindrical grooves are approximately 35.2% lower than those without them.

FEM을 이용한 벤틸레이티드 디스크 브레이크 열응력 해석에 관한 연구 (A Study on Thermal Analysis in Ventilated Disk Brake by FEM)

  • 김성모
    • 한국생산제조학회지
    • /
    • 제18권5호
    • /
    • pp.544-549
    • /
    • 2009
  • Thermal brake judder caused by the high friction heat of the brake disk. Hot thermal judder makes serious problems such as to be unstability to drivers or to decrease braking force of automobile. Because thermal judder vibration makes high vibration occurrence and thermal deformation of brake disk. Therefore it Is necessary to reduce or eleminate thermal Judder phenomenon by understanding and investigation. This paper introduces the thermal deformation arising from friction heat generation in braking and proposes the FEM analysis to predict the distribution of temperature and thermal deformation. the results of the FEM analysis show the deformed shape and temperature distribution of the disk brake. The optimization is performed to minimize the thermal judder of ventilated disc brake that is induced by the thermal deformation of the disk brake.

  • PDF

나선형 홈이 있는 벤틸레이티드 브레이크 디스크의 열 방출 성능 (Thermal Dissipation Performance of the Ventilated Brake Disc having Helical Grooved Vent)

  • 최영;최주원;김형만;서용위
    • 한국정밀공학회지
    • /
    • 제21권3호
    • /
    • pp.117-123
    • /
    • 2004
  • A brake disc with helical grooved vent in radial direction is proposed for the improvement of thermal dissipation. The heat transfer phenomenon is analyzed far both the proposed disc and the conventional one using finite element method. The thermal dissipation is considerably influenced by the geometrical differences of the brake discs. The results of the analysis show that the proposed brake disc with helical grooved vent has the improved performance to dissipate the thermal energy more effectively.

FEA와 다이나모메터를 이용한 자동차 디스크 브레이크의 열적 거동에 관한 연구 (A Study on the Thermal Behaviour of Automotive Disc Brakes Using FEA and Dynamometer)

  • 박범식;손영지;장성규;전언찬
    • 한국공작기계학회:학술대회논문집
    • /
    • 한국공작기계학회 2000년도 추계학술대회논문집 - 한국공작기계학회
    • /
    • pp.45-50
    • /
    • 2000
  • While braking cars, a large amount of energy is taken into the brake system in a short period of time. This leads to some problems ; cracking of the disc, non-uniform wear of pad and disc, fade. Thus it is important to measure the contact thermal behaviour precisely between disc and pad. The measurements must be considered to design the brake system. The paper describes methods to analysis the problem of the thermal behavior on the ventilated disc with ANSYS-a program of FEA and a brake dynamometer. According to this way, the paper can present the error between the data by the dynamometer and the results of analysis by ANSYS.

  • PDF

최소 열변형을 위한 자동차 디스크 브레이크 단면형상의 다구찌기법 기반 최적설계 (Optimization of an Automotive Disc Brake Cross-section with Least Thermal Deformation by Taguchi Method)

  • 김철;하태준
    • 한국자동차공학회논문집
    • /
    • 제24권1호
    • /
    • pp.1-9
    • /
    • 2016
  • Optimum cross-sectional shape of an automotive disc brake was developed based on FEM thermal analyses and the Taguchi method. Frictional heat flux and convection heat transfer coefficients were first calculated using equations and applied to the disc to calculate accurate temperature distribution and thermal deformations under realistic braking conditions. Maximum stress was generated in an area with highest temperature under pads and near the hat of ventilated disc and vanes. The SN ratio from Taguchi method and MINITAB was applied to obtain the optimum cross-sectional design of a disc brake on the basis of thermal deformations. The optimum cross-section of a disc can reduce thermal deformation by 15.2 % compared to the initial design.

원주가압형 브레이크 디스크의 열-구조 연성해석 (Thermal-Structural Coupled Field Analysis of the Circumferential Pressing Type Brake Disc)

  • 김형훈;이성욱;한동섭;한근조
    • 한국자동차공학회논문집
    • /
    • 제16권4호
    • /
    • pp.69-74
    • /
    • 2008
  • The heat generated by the brake system of vehicles results in reduction of friction force on the brake surface and vibration during a braking. To solve these problems, extensive research for the brake shape has been conducted such as drilling cooling holes on the brake disc, accommodating ventilated holes and etc. In this study, we suggest the circumferential pressing type brake disc in order to improve its cooling performance. In order to compare the cooling-down efficiency between the conventional side-pressing type and the circumferential-pressing type, we adopted the FMVSS 105-77 as thermal analysis conditions and This newly proposed concept has been verified using Thermal-structure Coupled Field Analysis along with comparative analysis with the existing ventilated disk.