• 제목/요약/키워드: Al brake disc

검색결과 8건 처리시간 0.024초

용사처리에 의한 자동차 브레이크용 마찰재료의 마찰성능개선에 관한 연구 (A study on the improvement of frictional performance of friction material for automobile brake by spray treatment)

  • 김윤해;배창원;손태관
    • Journal of Advanced Marine Engineering and Technology
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    • 제22권1호
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    • pp.67-76
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    • 1998
  • Friction materials for brake linings and clutches have severe performance requirements. The principal function of such frictional elements is to convert kinetic energy to heat, and then either to absorb or to dissipate heat. In order to achieve these objectives, the coefficient of friction must be as high as possible, independent of variations in operating conditions, and the necessary energy conversion must be accomplished with a minimum of wear on the contacting parts. In this study, Al powder, Al bronze powder and Mo powder used in general for automobile brake was sprayed on automobile brake disc to restrain rust and to maintain friction performance. Dynamo and corrosion tests have been carried out. It is concluded that the sprayed disc with Al bronze powder has the most improved frictional performance and anti-corrosive characteristics. The main results obtained can be summarized as follows; 1. From the corrosion current density test for gray cast iron and sprayed disc with powders of Al, Al bronze and Mo, it was cleared that the spray treatment with Al bronze powder showed the most superior anti-corrosive characteristics than other powders. 2. By anode polarization toward the noble direction from corrosion potential, corrosion current density with sprayed brake disc by Al-bronze powder was the lowest. 3. Mean frictional coefficients obtained from dynamo test are as follows : the sprayed disc with Al(99.99%) powder was 0.190 ; the sprayed disc with Al-bronze powder was 0.312 ; the sprayed disc with Mo powder was 0.257 ; the non-sprayed disc of gray cast iron was 0.331. In the case of the sprayed disc Al-bronze powder showed the most excellent frictional characteristics . 4. Amount of burnish quantity obtained from burnish test by dynamometer is as follows : the sprayed disc with Al-powder was 1.079 mm : the sprayed disc with Al-bronze powder was 0.155 mm : the sprayed disc with Mo powder was 0.253 mm : the non-sprayed disc of gray cast iron was 0.241 mm. Al-bronze powder also showed the most excellent burnish characteristics.

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트라이볼로지 관점에서 철도차량의 경량 제동 디스크와 라이닝의 특성 평가 (Characteristics Evaluation of Light Brake disc and Linning for Railway Vehicle In Terms of Tribology)

  • 김성권;이희성;권석진;권성태
    • Tribology and Lubricants
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    • 제27권2호
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    • pp.95-100
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    • 2011
  • The brake disc materials for railway vehicle have been mainly used cast-iron. The brake disc and pad should be light, resist to a thermal crack and absorb enough friction energy. In order to satisfy this requirement, aluminum alloy brake disc for railway vehicle has been newly developed. The aluminum itself has not been considered the friction material for railway vehicle. However, in the case of aluminum composite with dispersed ceramic particles, friction characteristics, resistance to wear and heat are much improved. In the present study, aluminum composite brake disc of 20% ceramic particle and three kinds of organic pads have been tested in dynamometer. The results show that Al MMC brake disc and pad have good friction coefficient and wear rate, and thermal cracks in brake disc have not been initiated. Also, the Al MMC brake disc can be applied to railway vehicle of 150 km/h.

제안된 알루미늄 복합체 제동 디스크 형상의 열응력 해석 (A Thermal Stress Analysis for Suggested Shape of Al Hybrid Brake Disc)

  • 임충환;구병춘
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2011년도 춘계학술대회 논문집
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    • pp.283-288
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    • 2011
  • The high heat resistant material for brake disc is required for higher speed trains. Although Aluminum is very expensive, it which has high thermal conductivity and low density has been adapted to high performance light-weight brake disc. In this study, we carry out the thermal stress analysis for suggested shape of Al hybrid brake disc which was designed to meet the optimal point between a performance and economic side. And we compare the results from the analysis to results of conventional disc at the same braking speed. The result show that the temperature on braking surface of Al hybrid disc is lower than the temperature on conventional disc surface, whereas the maximum thermal stress is larger than stress on conventional disc.

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제동 강성감 향상 인자에 대한 해석 및 검증에 관한 연구 (A Study on Analysis and Test for Improvement Factors of Brake Stiffness Feeling)

  • 심재훈;신웅희;이중희;전갑배;김병철;김봉수;이강국
    • 자동차안전학회지
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    • 제10권3호
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    • pp.38-44
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    • 2018
  • Conventional brake system was used for passenger cars and SUV for a long time. However, the high performance brake system has strongly required because of increase of engine power and customer's favorites etc. In this paper, a new high performance brake system for Europe was proposed. For this system, the high performance caliper and disc were newly developed. The superiorities of the developed high performance brake system were verified via heat capacity, hydraulic stiffness, corrosion and harsh braking mode test. Also, the high performance caliper and disc for the light-weight were applied to AL-Alloy and can obtain the weight reduction effect of 2.9 kg per vehicle. Finally, a developed high performance brake system is expected to be used for realization of the high performance at the same platforms.

알루미늄 복합재 제동디스크 주조 기술 개발 (Casting Technology of an Aluminum Alloy Composite Brake Disc)

  • 구병춘;김명호
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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    • pp.971-974
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    • 2011
  • Aluminum matrix composites reinforced with SiC particles(AMC) are one of the candidate materials for the weight reduction of rolling stock brake discs. It is known that weight reduction of about 40% is possible when they replace conventional cast iron brake discs. But casting is not easy because of bad wettability of SiC with Al alloy. We developed two AMC brake discs with SiC volume fraction of 20% by a new casting method. It was found the developed method produced brake discs of good quality.

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구리를 함유하지 않은 친환경 자동차 브레이크 패드의 마모 특성에 관한 연구 (A Study on the Wear Properties of Cu-free Ecofriendly Vehicle Brake Pad)

  • 김기봉;양상선;이성주;황석훈;김신욱;김용진
    • 한국분말재료학회지
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    • 제25권1호
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    • pp.30-35
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    • 2018
  • The friction characteristics of Al-Fe alloy powders are investigated in order to develop an eco-friendly friction material to replace Cu fiber, a constituent of brake-pad friction materials. Irregularly shaped Al-Fe alloy powders, prepared by gas atomization, are more uniformly dispersed than conventional Cu fiber on the brake pad matrix. The wear rate of the friction material using Al-8Fe alloy powder is lower than that of the Cu fiber material. The change in friction coefficient according to the friction lap times is 7.2% for the Cu fiber, but within 3.8% for the Al-Fe alloy material, which also shows excellent judder characteristics. The Al-Fe alloy powders are uniformly distributed in the brake pad matrix and oxide films of Al and Fe are homogeneously formed at the friction interface between the disc and pad, thus exhibiting excellent friction and lubrication characteristics. The brake pad containing Al-Fe powders avoids contamination by Cu dust, which is generated during braking, by replacing the Cu fiber while maintaining the friction and lubrication performance.

접촉 조건에 따른 C/C-SiC-Cu복합재와 Al/SiC복합재의 마모 특성에 관한 연구 (Tribological Characteristics of C/C-SiC-Cu Composite and Al/SiC Composite Materials under Various Contact Conditions)

  • 김병국;신동갑;김창래;구병춘;김대은
    • 대한기계학회논문집A
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    • 제41권1호
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    • pp.21-30
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    • 2017
  • 디스크 브레이크의 온도는 제동 시 변할 수 있으며 이러한 표면 온도의 변화는 마찰/마모 특성에 영향을 줄 수 있다. 따라서 효율이 우수한 브레이크 개발을 위해서는 브레이크 소재의 마찰/마모 특성에 대한 이해가 필요하다. 본 연구에서는 디스크 브레이크 시스템에 사용되는 C/C-SiC-Cu복합재와 Al/SiC복합재에 대하여 표면 온도와 접촉압력에 따른 마찰/마모 특성을 비교하였다. 이를 위해 온도 및 하중조절이 가능한 pin-on-reciprocating방식의 마찰실험기를 사용하였다. 실험결과, 마찰은 온도와 거리에 따라 현저하게 변하였다. 또한 마모로 인하여 생성된 입자가 접촉 압력에 의해 표면에 뭉쳐져 transfer layer가 형성되었고, 표면 거칠기가 증가하였다. 이러한 연구 결과는 다양한 조건에서 작동하는 브레이크 시스템 개발을 위한 기초자료로 활용될 수 있을 것이다.

알루미늄 합금 디스크용 마찰재의 제조 및 그 특성에 관한 연구 (The Studies on the Fabrication and Properties of Friction Materials toy Aluminium Alloy Disk)

  • 손태관;장상희;제갈영순
    • Composites Research
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    • 제16권4호
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    • pp.22-28
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    • 2003
  • 본 연구는 자동차용 알루미늄 합금 디스크에 적용하기 위만 마찰재 제조에 관만 내용을 제시한 것이다. 최적 마찰재 조성을 확보하기 위하여 섬유, 결합재, 충진재, 마찰 성능 조정재 등으로 분류할 수 있는 각 원재료를 채택, 배합 설기에 의한 마찰재 시편을 제작하였으며 그 특성을 실제 차량 1/5 크기의 브레이크 다이나모미터를 이용하여 평가하였다. 마찰성능을 JASO C406 Pl에 준하여 실험만 결과 마찰계수가 0.35∼0.38. fade율이 18%였으며, 내 마모성은 JASO C427에 준하여 온도별 마모시험을 실시하였는데 시험 종료후 마찰재의 마로량이 1.6mm, 디스크 마모량이 0.08mm 수준인 우수한 배합 조성을 획득할 수 있었다. 시험 전$.$후의 마찰재와 알루미늄 합금 디스크의 표면상태는 주사전자현미경을 이용하여 관찰하였다.