• Title/Summary/Keyword: Disk-Pad Brake

Search Result 94, Processing Time 0.026 seconds

디스크 브레이크의 편마모 방지를 위한 finger 안쪽면 윗 부분이 가공된 캘리퍼 하우징의 유한 요소 해석 (FEM Analysis of Caliper Housing Cut Inside Upper Face for Unbalance Wear Prevention of Disk Brake Pad)

  • 김남경;강종표
    • 한국기계가공학회지
    • /
    • 제1권1호
    • /
    • pp.89-100
    • /
    • 2002
  • The purpose if this research was to improve the pressure distribution on the disk brake pad Not uniform pressure distribution on the disk brake pad generate the unbalance wear of it and the unbalance wear of disk brake pad generate vibration, noise, heat and reduce the braking capacity. For improve the pressure distribution on the pad in this research, upper face of caliper housing finger was cut. Two kinds of caliper which uncut and cut of finger face were compared the stress distribution by FEM analysis and real experiment. Also natural frequency and deforming displacement ware calculated. It was understood that pressure distribution could Improve by cut inside upper face of caliper housing finger.

  • PDF

철도차량용 제동 디스크의 트라이볼로지 특성 연구 (Tribological Characteristics of Brake Disc for Train)

  • 김상호;이희성
    • Tribology and Lubricants
    • /
    • 제23권1호
    • /
    • pp.19-28
    • /
    • 2007
  • Mechanical Brake system is inevitable equipment for stability of train and speed of the train. Especially brake disk and brake pads are core parts of mechanical brake system. It was investigated with tribological characteristics of brake discs for train by using lab-scale dynamometer. Gray cast iron disk was most attacked with sintered brake pad. Alloyed steel disk and NCM cast iron disk had suitable friction coefficient, high stability and low disk attack to the sintered brake pad. But at the view of economy, low alloyed cast iron will be most suitable choice.

제동시 피스톤 소재를 고려한 브레이크 오일 온도의 수치적 예측 (Numerical Prediction of Brake Fluid Temperature Considering Materials of Piston During Braking)

  • 김수태;김진한;김주신
    • 한국공작기계학회:학술대회논문집
    • /
    • 한국공작기계학회 2004년도 추계학술대회 논문집
    • /
    • pp.445-450
    • /
    • 2004
  • Recently, many studies have been performed and good results have been reported in literature on the prediction of the brake disk temperature. However, study on the brake fluid temperature is rarely found despite of its importance. In this study, brake fluid temperature is predicted according to material property of brake piston. For the analysis, a typical disk-pad brake system is modeled including the brake disk, pad, caliper, piston and brake fluid. Vehicle deceleration, weight distribution by deceleration, disc-pad heat division and the cooling of brake components are considered in the analysis of heat transfer. Unsteady-state temperature distribution are analyzed by using the finite element method and numerical results are compared with the vehicle test data

  • PDF

고속 전철에서 디스크 브레이크의 열거동에 관한 유한요소해석 (Finite Element Analysis of Thermal Behaviours of a Disk Brake in High-Speed Trains)

  • 김청균;조승현
    • Tribology and Lubricants
    • /
    • 제14권1호
    • /
    • pp.28-36
    • /
    • 1998
  • This paper presents the thermal behaviours of a solid type disk brake for a high-speed train. The thermal behaviours of a brake disk with 50mm thickness shows good performance compared with 45mm thickness of a disk because of a high specific heat capacity. The FEM results show that the thickness of the disk with a same weight of the brake disk should be increased for a good flexibility of the contact thermal problems. Therefore, the ratio between the pad and disk in diameter may be reduced and the thickness of a disk increased.

디스크 질량 변화에 따른 철도차량용 제동디스크의 마찰 특성 (Influence of Disk Mass with regard to Frictional Characteristics of Brake Disk for Rolling Stock)

  • 정종록;고은성;이희성
    • Tribology and Lubricants
    • /
    • 제30권4호
    • /
    • pp.240-245
    • /
    • 2014
  • Low alloy heat resistant brake disk and sintered brake pad are applied to mechanical brake system for the speed-up of urban rapid transit. In this research, we analyzed how the frictional characteristics between brake disk and pad are influenced by the disk mass. At a high disk mass, the friction stability was the lower value as a result of the lack of tribofilm formation at the disk surface. Wear rates of friction materials showed the higher value at a low disk mass and wear rates of 10 mm and 15 mm showed the similar level. Average friction coefficient was the lower value at the 10 mm disk thickness and range of variation of average friction coefficient was also the smaller value at the 10 mm disk thickness. However, there were no significant changes in the friction coefficients under any of test conditions. Surface roughness of a disk showed the highest value at the 5 mm disk and surface roughnesses of 10 mm and 15 mm showed the similar level. As a result, friction characteristics of disk mass influenced the friction stability, as well as the wear rate of friction pad and disk, but not the friction coefficient.

자동차 제동시스템의 패드, 라이닝, 허브디스크에 관련된 트라이볼로지적인 특성에 관한 고장사례연구 (Failure Study for Tribological Characteristics Including with Pad, Lining and Hub disk in Vehicle Brake System)

  • 이일권;김청균;조승현
    • Tribology and Lubricants
    • /
    • 제27권5호
    • /
    • pp.269-274
    • /
    • 2011
  • The purpose of this paper is to study and analyze the improvement method for the failure examples including the vehicle brake system in actual field. It was verified that the indicator plate of pad wear scratched the brake disk because of wearing after displacement of non- identification parts pad. The caliper of other vehicle was installed with brake system verified the phenomenon produced groove in center point because of one side wear when the pad was not fully contacted with the rub disk by other action surface pressure and pad action condition. It verified that the crack phenomenon fatigue was produced by brake thermal deformation because of decreasing the thickness by grinding to modify the non-uniformed wear of brake disk. It verified that the friction sound was produced by the friction phenomenon because of non-uniformed contact of lining and an alien substance with inner of the drum and lining braking by crack phenomenon with brake drum surface.

고속용 브레이크에서 디스크 패드의 열응력 특성에 관한 연구 (Thermal Stress Characteristics of a Disk Pad in High-Speed Brakes)

  • 김청균;조승현
    • Tribology and Lubricants
    • /
    • 제14권4호
    • /
    • pp.29-36
    • /
    • 1998
  • The thermal characteristics of a disk such as temperature distribution, thermal behaviors and thermal stress during a braking operation has been analyzed for a high-speed brake using the finite element method. The maximum stress for a pad loaded against a disk was occurred at the trailing and leading edges of the disk pad at the underlayer-backplate interface. The FEM results indicate that the thermal characteristics of the spot type pad shows good performance compared with those of the flat type pad. Thus, the spot type pad in brake system may be recommended for the high-speed train system.

CV-NCM 주철재 제동디스크의 성능 검증을 위한 다이나모 시험연구 (Dynamo Test Research for Performance Verification of CV-NCM Cast Iron Brake Disk)

  • 길형균;고태환;조동현;한성호
    • 한국철도학회:학술대회논문집
    • /
    • 한국철도학회 2006년도 추계학술대회 논문집
    • /
    • pp.274-280
    • /
    • 2006
  • The study is to analyze dynamo test results for various commercial pads in order to verify the performance of brake disk with CV-NCM cast iron. The developed brake disk will apply to 200 km/h tilting trains that is being developed as one part of project for speed-up on Korean existing railroad. The test program is made out suitably for braking condition and performance of test equipment by referring UIC 541-3. Two kinds of resin pad and one kind of foreign sintered pad suitable for 200 km/h trains are used as various commercial pad for the dynamo test. The data aquisition for the maximum and smallest temperature, hot spot, etc. on disk and pad is performed by using the thermocouples and thermal imaging cameras. From this research, we obtained braking characteristics between CV-NCM cast iron disk and pad of various material and will be utilized usefully as basis data of performance optimization of developing sintered pad.

  • PDF

자동차 디스크 브레이크의 방열성능에 관한 연구 (Thermal Behavior of Automotive Ventilated Disk Brake)

  • 김진택;백병준
    • 한국윤활학회:학술대회논문집
    • /
    • 한국윤활학회 2000년도 제32회 추계학술대회 정기총회
    • /
    • pp.186-192
    • /
    • 2000
  • The heat generated in contact type braking system can cause an unacceptable braking performance. Thermal behavior of ventilated disk brake system is presented in this paper. The temperature and velocity fields of 3-D unsteady simulated model are obtained using a software package "FLUENT". The numerical results show that there exits a temperature nonuniformity between the disk faces contacting with pads. The conduction rate through the disk and pad is calculated and the effect of material conductivity is also investigated.estigated.

  • PDF