• Title/Summary/Keyword: brake pad

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A Study on Convergence Contact Behavior of Friction Heat and Pad on Disk Brake (디스크 브레이크에서 마찰열과 패드에 작용하는 융합 접촉거동에 관한 연구)

  • Han, Seung-Chul;Lee, Bong-Gu
    • Journal of the Korea Convergence Society
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    • v.9 no.1
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    • pp.283-289
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    • 2018
  • In automotive disc brake systems, frictional heat is not uniformly dispersed for reasons such as heat flux and thermal deformation. The thermoelastic deformation due to the frictional heat affects the contact pressure distribution and the contact load may be concentrated on the contact portion on the the disc brake surface, resulting in thermoelastic instability. In this study, thermal analysis and thermal deformation analysis considering the contact between disk and pad occurred during braking through 3D axial symmetry model with reference to the experimental equation and Kao's analysis method of contact pressure of disk and pad. ANSYS is used to analyze the thermal and elastic instability problems occurring at the contact surface between the disk and the pad, considering both the thermal and mechanical loads. A 3D axisymmetric model with direct contact between the disk and the pad was constructed to more accurately observe the thermal behavior of the disk by observing the frictional surface temperature, thermal deformation and contact thermal stress of the disk.

Study on the Reduction of Wet-Brake Noise (습식 브레이크의 소음 저감에 대한 연구)

  • Koo, Ja-Ham;Kwon, Soon-Hong;Chung, Sung-Won;Park, Jong-Min;Choi, Won-Sik;Kim, Jong-Soon;Kwon, Soon-Goo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.14 no.1
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    • pp.57-62
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    • 2015
  • The wet brakes used on a forklift often produce noise upon engagement. The elimination or reduction of this squeal noise is an important task for the improvement of the comfort of those operating these machines. In this paper, a test rig was developed for the testing of brake noise, and the squeal noise was measured with this apparatus. Automatic transmission fluid and grooves in the material of the friction-plate pad were found to be the main factors causing squeal noise. In order to identify the characteristics of this type of noise, signal analyses of the noise were conducted using different frequency spectra. The experimental results showed that the viscosity of the automatic transmission fluid and the groove pattern on the friction-plate pad largely affected the reduction of the wet brake squeal noise made by an industrial forklift.

The Effect of Damping of a Two-degree-of-freedom Model for the Disc Brake Squeal Noise (2자유도계 모델을 이용한 디스크 브레이크 스퀼 소음에 대한 댐핑의 영향에 관한 연구)

  • Shin, Ki-Hong;Joe, Yong-Goo;Oh, Jae-Eung
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.13 no.12
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    • pp.903-910
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    • 2003
  • A two-degree-of-freedom model is suggested to describe basic dynamical behaviors of the interaction between the pad and the disc of a disc brake system. Although a pad (and a disc) has many modes of vibration in practice, only one mode of each component Is considered. In this paper, a linear analysis is performed by means of the stability analysis to show various conditions for the system to become unstable, and is based on the assumption that the existence of limit cycle (this corresponds to an unstable equilibrium point inside the limit cycle) represents the squeal state of the disc brake system. The results of the stability analysis show that the damping of the disc is as much Important as that of the pad, whereas the damping of the pad only is considered In most practical situations.

Influence of External Air Velocity for Tribological Characteristics between Sintered Friction Material and Disk (외부 공기속도 변화에 따른 소결마찰재와 디스크간 마찰특성)

  • Lee, Jong Seong;Lee, Hi Sung
    • Tribology and Lubricants
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    • v.29 no.1
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    • pp.19-26
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    • 2013
  • Cu-matrix sintered brake pads and low-alloy heat-resistant steel are commonly applied to basic brake systems in high-energy moving machines. In this research, we analyzed the tribological characteristics to determine the influence of the air velocity between the disk and pad. At a low brake pressure with airflow, the friction stability was decreased as a result of the lack of tribofilm formation at the disk surface. However, there were no significant changes in the friction coefficient under any of the test conditions. The wear rates of the friction materials were decreased with an increase in the airflow velocity. As a result, the airflow velocity influenced the friction stability, as well as the wear rate of the friction materials and disk, but not the friction coefficient.

Modal Analysis of Brake Pads with Various Slot Types (디스크 브레이크 패드의 마찰재 슬롯 형상에 따른 진동 모드)

  • 유동호;박경환
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2001.11a
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    • pp.325-328
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    • 2001
  • Disc brake squeal is caused by mechanical vibrations generated from friction force excitations exerted by the pad on the rotor. In order to understand the origin of these vibrations and to speed up the design, the characterization of the individual brake system components is desirable. In this paper, the results of modal analysis are presented in terms of several slot-type with free-free boundary conditions. Special attention is paid to variations of the natural frequency at each vibration mode as the result of modifying slot pattern.

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

  • 박범식;손영지;장성규;전언찬
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2000.10a
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    • pp.45-50
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    • 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.

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Thermoelastic Contact Analysis of Drum Brakes by Finite Element Method (유한요소법에 의한 드럼 브레이크의 열탄성 접촉해석)

  • Seo, Jung-Won;Goo, Byeong-Choon
    • Proceedings of the KSME Conference
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    • 2000.04a
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    • pp.381-386
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    • 2000
  • The brake force of drum brakes for commercial vehicles is applied by a s-cam. First of all the influence of the s-cam load angles and elastic modulus of the pad on the contact pressure distribution between pad and drum was checked by using 3 dimensional finite element model. In the second part, temperature and thermal stress analyses were carried out by an axisymmetric model with constant heat flux and pressure-proportional heat flux. In the case of temperature analysis the heat conduction from the interface to the pad and the drum was modeled using a thin soft film element, so artificial division of the generated heat flux between pad and drum is not necessary. The analysis was performed by ABAQUS/Standard code.

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Optimization of Disc Braking Force pattern from the viewpoint of Braking Energy (제동에너지 관점에서의 최적 디스크 제동력 패턴 설정)

  • Kim, Young-Guk;Park, Chan-Kyoung;Kim, Ki-Hwan;Kim, Seog-Won
    • Proceedings of the KSR Conference
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    • 2006.11b
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    • pp.294-299
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    • 2006
  • Korean high speed train(HSR-350x) has adopted a combined electrical and mechanical(friction) braking system. Brake blending control unit(BBCU) controls each brake system to fulfill the required brake performances such as braking distance, deceleration and jerk. When the disc brake is applied in the high speed region, the wear of pad is increased rapidly. In this paper, we discuss the optimized patterns of the disc brake force from the view point of braking energy.

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

  • Hwang, Pyung;Seo, Hee-Chang;Wu, Xuan
    • Tribology and Lubricants
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    • v.25 no.6
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    • pp.421-426
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    • 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.

Evaluation of the Performance of the Scattering Dust Collector Mounted on the Brake Caliper (브레이크 캘리퍼에 장착한 비산먼지 포집기의 성능 평가)

  • Deok-Ho Kim;Byeong-Rea Son
    • Journal of the Korean Society of Industry Convergence
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    • v.27 no.3
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    • pp.693-699
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    • 2024
  • The main cause of scattering dust generated by transportation equipment such as automobiles was largely due to exhaust gas from internal combustion engines in the past, but it was generally recognized that non-exhaust causes such as abrasion of the tires or brake pads were low. Accordingly, scattering dust generated by exhaust gas has consistently existed in many studies, such as technological progress and related regulations, but research on non-exhaust is relatively insignificant, and the need for research on scattering dust generated by non-exhaust is emerging. In this study, a dust collector that can be easily mounted on a caliper to collect scattering dust generated by pad wear during the brake operation of an automobile was manufactured. In this study, we developed a dust collector that is easy to mount on calipers to collect scattering dust caused by pad wear during brake operation of automobiles. According to the installation of the manufactured dust collector, the performance of scattering dust by brake operation and the temperature change characteristics of calipers according to the structure of the dust collector were evaluated.