자동차 브레이크 패드 분진 유해물질 포집 연구

손병래(Byeong- rae Son) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11

The car runs at high speed when driving, but it must be braked when a dangerous situation occurs while driving. In case of braking, the brake system is operated and it is braked by the friction force. To generate the friction force, brake is performed by using disc and brake pad. In this case, friction heat is generated in the disc and brake pad, and ultra fine dust dust and iron powder of the disk are generated, which is the main culprit of air pollution and water pollution. In this study, a technique to capture the dust of the brake pad dust and the iron of the disk is studied.

플렉서블 타입 소결 브레이크 패드의 적용 연구

김성권(SoungKwon Kim),김상호(SangHo Kim),권석진(SeokJin Kwon),이희성(Hi Sung Lee) 한국트라이볼로지학회 2011 한국윤활학회지(윤활학회지) Vol.27 No.1

Metallic sintered brake pads are often applied to mid/high speed train due to their high strength and thermal characteristics. Imbalance contact between discs and pads can greatly influence the life span, one sided wear, discs attack/crack and threat the safety of the train during operation. In this research, we analyzed pressure/temperature distribution between brake pads and disks. Analyzed data had been verified and modified to conduct further tests of flexible brake pads with small/full-scale dynamo test. Flexible brake pads were installed to high speed train to conduct further tests to identify the differences between rigid brake pads and flexible brake pads. In result, Flexible brake pads showed outstanding disk thermal stability, one sided wear, noise and wear rate than rigid brake pad.

승용차 브레이크 패드의 마모수명 예측 프로세스 구축 및 적용

정수식(Soosik Chung),정원욱(Wonwook Jung),최성진(Sungjin Choi),정청성(Chungsung Jung) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11

It is important to consider the brake pad wear life in the development of brake system for automobiles, because of reducing customer complaint due to fast wear and designing optimal specifications. So in this paper, the factors related to pad wear are decided 4 categories as vehicle type, brake system type, brake pad properties and driving pattern. As to the factors, wear sensitivity is tested by brake dynamometer as well as the vehicle. In consequence, we analyzed sensitivity of the wear factors and developed the pad wear predicting program by MS Excel VBA. Finally, it is verified from vehicle driving test data as 84~96% of accuracy. As a result the brake pad wear life can be possible to predict reasonably in primary vehicle developing stage, and it helps to improve optimal design and reduce time & cost, too.

열적 탄소성을 이용한 브레이크 디스크의 열 응력 및 변형 해석

김춘휴(Choonhyu Kim) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11

Under braking, the lower frequency vibration in brake system happens due to the brake torque variation(BTV). This vibration called the judder is classified with the cold judder and the hot judder. This paper deals with the coning deformation which is related to the hot judder. Thermal energy generated under the braking condition is partitioned with the heat penetration coefficient of the disc and pad. Accordingly, the brake disc absorb the generated energy about 98%. From the results of the computational fluid dynamics(CFD) analysis for the brake disc, the heat transfer coefficient(HTC) is higher at an entrance of the vent hole than at an exit. And the HTC is uniform on the disc plate. From the results of the transient heat transfer analysis for the brake disc which use the thermal material properties, the temperature variation is larger on the face of disc plate than in the internal point of a brake disc. And the outer plate has the compressive stress under braking condition, but it has the tensile stress under the cooling condition to room temperature. Particularly, the neck has the largest stress. In the case that the stiffness at the neck increase by extending the vanes of the vent hole to the neck, it’s found that the coning deformation of the brake disc is reduced.

F1 서킷 주행을 통한 브레이크 시스템의 평가법 개발

박형배(Hyung Bae Park),정성필(Sung Pil Jung),이필구(Pil Gu Lee),최희범(Hee Bum Choi),손태관(Tae Kwan Son) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11

The brake system is a very important system for automobile safety. However, existing brake evaluation methods are not suitable for evaluating high performance brake systems. In this paper, driving in the F1 Circuit and measure data and developed an evaluation method for brake systems based on braking energy and braking power.

소형풍력발전기 브레이크 패드 마모 및 디스크 온도 측정 센서 개발

김만복(Manbok Kim) 한국신재생에너지학회 2021 한국신재생에너지학회 학술대회논문집 Vol.2021 No.7

신재생 에너지에 대한 중요도가 증가와 동시에 풍력 발전 사업으로 인한 발전량도 증가하고 있는 추세이다. 하지만 풍력발전기의 유지보수에 대한 모니터링 시스템의 발전은 풍력산업의 발전에 비해 상대적으로 가야할 길이 멀다. 최근까지도 풍력발전기 내부에서 원인불명의 화재사고가 빈번하게 일어나고 있다. 풍력발전기의 유지보수에서 가장 중요한 것은 브레이크 시스템이다. 강풍이나 태풍으로 인해 블레이드 고속회전으로 풍력발전기의 손상을 예방할 수 있는 것이 바로 제동장치이다. 하지만 자동장치에서 브레이크 패드나 브레이크 디스크에 문제를 미리 모니터링하지 못했을 경우 심각한 사고를 야기할 수 있다. 따라서 본 논문에서는 풍력발전기의 브레이크 시스템 중 브레이크 패드의 마모량을 미리 파악할 수 있는 센서와 브레이크 디스크의 온도를 측정하는 센서를 개발하여 풍력발전기의 브레이크 시스템의 패도 마모량과 브레이크 디스크의 온도를 실시간으로 모니터링할 수 있는 설계를 구현하였다.

접촉해석에 의한 철도차량용 제동패드의 형상 최적화

구병춘(Byeong-Choon Goo),나인균(In-Kyun Na) 한국트라이볼로지학회 2014 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.30 No.3

To stop a high speed train running at the speed of 300 km/h, the disc brake for the train should be able to dissipate enormous kinetic energy of the train into frictional heat energy. Sintered pin-type metals are mostly used for friction materials of high speed brake pads. A pad comprises several friction pins, and the topology, length, flexibility, composition, etc. have a great influence on the tribological properties of the disc brake. In this study, the topology of the friction pins in a pad was our main concern. We presented the optimization of the topology of a railcar brake pad with nine-pin-type friction materials by thermo-mechanical contact analysis. We modeled the brake pad with/without a back plate. To simulate a continuous braking, the pad or friction materials were rotated at constant velocity on the friction surface of the disc. We varied the positions of the nine friction materials to compare the temperature distributions on the disc surface. In a non-optimized brake pad, the distance between two neighboring friction materials in the radial direction from the rotational center of the disc was not equal. In an optimized pad, the distance between two neighboring friction materials in the radial direction was equal. The temperature distribution on the disc surface fluctuated more for the former than the latter. Optimizing the pad reduced the maximum temperature of the brake disc by more than 10%.

환원분철을 이용한 자동차 브레이크용 패드 개발

김병삼 ( Kim Byoung-sam ),정영달 ( Chung Young-dall ),이성기 ( Lee Sung-ki ) 한국환경기술학회 2000 한국환경기술학회지 Vol.1 No.3

본 연구에서는 제철소 고로에서 발생하는 부산물을 재활용하기 위하여 부산물을 가공하여 환원분철한 후 자동차 브레이크 패드의 원료로 이용하고자 하였다. 환원분철을 자동차 브레이크원료의 일부로 사용한 후 브레이크 다이나모미터, 스케일 테스터, 만능시험기, 소음계 등의 장비를 이용하여 자동차 브레이크 패드의 성능을 평가하였다. 또한, 본 연구에서는 환원분철을 자동차 브레이크 패드 원료의 일부로 사용하여 제조된 패드와 종래의 패드와의 성능을 비교하였다. 본 연구의 결과는 제철 고로에서 발생하는 부산물에 대한 재활용성 여부를 판단하는데 있어 기초자료로 활용될 것으로 판단된다. Friction material is a very important element of disk brakes, because it is directly related to brake performance in such areas as effectiveness, friction stability with various brake conditions, pad life and different kinds of noise and vibration. Although friction material manufactures have worked to develop many different friction materials, very few studies have been published about the development of friction materials. Therefore knowledge of friction material development is not widespread. The scope of this paper is the basic considerations, studies and experiments which focus on brake pad development using sponge iron of blast furnace waste.

실차 실험 시 브레이크 디스크-패드 마찰 계수 예측을 위한 수학적 방법

정성필(Sung Pil Jung),유덕현(Duk Hyeon Yu) 대한기계학회 2019 大韓機械學會論文集A Vol.43 No.10

본 연구에서는 실차 실험 시 고가의 6분력계(wheel force transducer)를 사용하지 않고, 제동압(brake pressure)과 차량 속도(vehicle speed)를 이용하여 브레이크 디스크와 패드 간 마찰 계수를 예측하는 수학적 방법을 기술한다. 역학적 평형 방정식을 이용하여 제동 시 타이어에 작용하는 축하중 변화와 이에 따른 타이어 동반경 변화를 반영하여 브레이크 패드의 마찰력을 계산하였다. 장비를 이용하여 본 연구에서 제시한 수식에 사용되는 계수값을 측정하는 방법을 기술하였다. 실제 차량을 초속도 100km/h, 160km/h 상태에서 제동시험을 실시하였고, 이때 측정한 데이터를 이용하여 수식에 대입하여 디스크-패드 마찰 계수를 산출해 냄으로써 본 연구에서 제시한 수학적 방법의 적용 가능성을 검토하였다. In this study, a mathematical method for predicting the friction coefficient between the brake disc and the brake pad using braking pressure and vehicle speed without using an expensive wheel force transducer is proposed. Using the force equilibrium equation, the friction force of the brake pad was calculated by reflecting the change in axial load acting on the tire during braking, and the corresponding change in the radius of the tire. A method for measuring the coefficients used in the equations presented in this study is described using the machine. The braking test was carried out at 100 km/h and 160 km/h at the initial speed of the vehicle. The disk-pad friction coefficient was calculated using the measured data, and the applicability of proposed method was discussed.

자동차 제동시스템의 패드, 라이닝, 허브디스크에 관련된 트라이볼로지적인 특성에 관한 고장사례연구

이일권(IL Kwon Lee),김청균(Chung Kyun Kim),조승현(Seunghyun Cho) 한국트라이볼로지학회 2011 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.27 No.5

?;?;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.