共查询到19条相似文献,搜索用时 179 毫秒
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目前,国内外用于汽车制动的摩擦材料主要有石棉树脂(国家法规已限制使用)型摩擦材料、无石棉树脂型摩擦材料、金属纤维增强摩擦材料、半金属纤维增强摩擦材料和混杂纤维增强摩擦材料等,国内以半金属纤维增强摩擦材料的应用最为普遍。上述这些摩擦材料的基本成分是增强纤维、粘结剂(树脂)和填料。它们经浸渍或混炼,模压成型而制成各种形状的摩擦片。 相似文献
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纤维量对汽车摩擦材料性能的影响 总被引:6,自引:1,他引:6
研究了不同体积百分数混杂纤维增强材料对汽车摩擦材料的摩擦,磨损性能及硬度,冲击和三点弯曲性指标的影响,结果表明,摩擦材料的冲击强度,三点弯曲断裂强度及硬度随纤维量的增加而上升,混杂纤维的含量以体积百分数为10%为最佳,此时材料有较高的摩擦因数和较低的磨损量,但冲击强度,弯曲强度及硬度指标都能达到使用要求。 相似文献
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以改性树脂与丁腈橡胶粉共混物为粘结剂,采用矿物纤维、陶瓷纤维、纤维素纤维和钢纤维等多种增强纤维混杂增强,研制出汽车用少金属制动摩擦材料。用XD—MSM定速摩擦试验机考察了研制的新型制动摩擦材料在不同温度下的摩擦磨损性能,并与同类其他优质产品进行了性能比较;还对样品的磨损表面进行了分析。试验结果表明,所研制的少金属制动摩擦材料在陶瓷纤维含量为8%。总纤维含量为30%时,综合性能最好。与国内外同类优质产品相比,研制的少金属制动摩擦材料的摩擦系数较为平稳、磨损率适中、制动过程中无噪声,抗热衰退性能较好。 相似文献
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(1)更换制动蹄片的要求。制动蹄片是制动盘上的摩擦材料,由于摩擦作用,制动蹄片会在反复制动过程中逐渐磨损减小。摩擦材料在磨损后仍然可以使用.摩擦材料使用完后.制动盘就会与金属直接接触.最终会丧失制动效果,并损坏制动盘,影响行车安全。更换制动蹄片时,最好使用材料好、性能高的制动蹄片.因为经济性和安全性成正比,制动蹄片材料越好,使用寿命越长,安全性能较好。 相似文献
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为解决树脂基纤维增强汽车制动摩擦片存在的热衰退问题,对其粘结剂进行了改性。通过正交试验,分析了高温下摩擦材料各成分对制动摩擦片热衰退性能的影响,探讨了制动摩擦片的摩擦磨损机理,优化了摩擦材料配方。试验结果表明,采用优化后配方研制的制动摩擦片在高温下具有良好的抗热衰退性能,摩擦因数稳定,磨损率低。 相似文献
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湿式摩擦材料它具有良好的摩擦磨损性能,广泛应用在汽车,摩托车和各类机械相,根据影响摩擦材料主要参数其压力(P)、湿度(T)、线速度(V)和润滑油工作特性这一情况,采用MM-1000型摩擦试验机对一批国内,外具有代表性的湿式摩擦材料性能进行了测试,根据湿式摩擦材料使用工况,对湿式摩擦材料进行模拟试验。 相似文献
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随着社会的不断发展进步,人们对桥梁设计美观性的要求越来越高。许多桥梁以简支梁板桥为基本体系,新增装饰性结构形成景观桥梁,以满足人们的观赏性。通过对一座装饰性斜拉拱桥设计进行总结,为今后同类型工程设计提供参考。 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(11):1601-1620
ABSTRACTTires are used by the customers during several tens of thousands of kilometres, and before their replacement, the driver will encounter a continuous variation of tread depth due to the tire wearing. Although the wet braking labelling demonstrates the performance of the tire in the new stage, it is known that the wet traction evolves with tire wear. In this paper, an in-depth comparison of the wet grip performance of new and worn tires will be conducted, based on the regulatory wet braking test. For this purpose, we propose an original approach to analyse braking test results, which allows breaking down and quantifying the relative importance of the mechanisms involved during this test. This study demonstrates that two main mechanisms are taking place during the entire test: rubber friction and hydroplaning mechanisms. The µ value obtained at low speeds reflects the friction potential of the tested tires while the decline of performance at higher speeds is attributed to hydroplaning mechanisms. This analysis is conducted on numerous tires and demonstrates that current regulatory test applied on new tires is focussing mainly on the rubber friction mechanism. The same test applied on worn tires exhibits both rubber friction and hydroplaning mechanisms. The mechanisms decomposition shows that the source of the performance decline from new to worn status varies greatly, some tires having most of their performance loss due to hydroplaning, some others due to rubber friction drop. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(4):625-638
Closed-loop control of a snowplow applicator, based on direct measurement of the road surface condition, is a valuable technology for the optimisation of winter road maintenance costs and for the protection of the environment from the negative impacts of excessive usage of de-icing chemicals. To this end, a novel friction measurement wheel is designed to provide a continuous measurement of road friction coefficient, which is, in turn, utilised to control the applicator automatically on a snowplow. It is desired that the automated snowplow applicator deploy de-icing materials right from the beginning of any slippery surface detected by the friction wheel, meaning that no portion of the slippery road surface should be left untreated behind, as the snowplow travels over it at a reasonably high speed. This paper describes the developed wheel-based measurement system, the friction estimation algorithm and the expected performance of the closed-loop applicator system. Conventional and zero velocity applicators are introduced and their hardware time delays are measured in addition to the time delay of the friction estimation algorithm. The overall performance of the closed-loop applicator control system is shown to be reliable at typical snowplowing speeds if the zero velocity applicator is used. 相似文献
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小型汽油机缸套——活塞环摩擦副是发动机中非常重要的一对摩擦副,功能是防止燃气泄漏及过量润滑油进入燃烧室,任何一方过量磨损都影响发动机的性能和排放。在负荷和转速不高的汽油机上使用表面未经过强化的铝合金气缸,合理选取活塞环的材料和相关结构参数,既可满足使用要求,又能降低生产成本。 相似文献
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采用双曲线型荷载传递函数,考虑单根筒桩内摩阻力沿桩身两种不同的分布形式对竖向承载力的影响,给出了具体迭代步骤及参数确定方法,并结合具体工程实例,对比分析了预测结果和实测情况。研究结果表明,考虑筒桩内摩阻力与外摩阻力呈正比的分布形式与实测情况较相符,而考虑内摩阻力从筒桩端部向上沿深度呈指数分布形式的计算结果偏保守,筒桩内摩阻力对其承载力的贡献为10%~20%左右,忽略其影响会引起一定的计算误差。比较了同样工况和地质条件下,筒桩及相应实芯桩的承载力情况,进一步说明了同样情况下筒桩比普通实芯桩有更高的单方混凝土承载力,可以降低工程造价。 相似文献
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无纤维SMA由于不含纤维材料,不但降低了材料成本,也简化了生产工艺,其性能与普通SMA相当,但其配合比设计难度更高,生产控制要求更严格。本文通过SMA-13配合比设计及试验段应用,介绍上海浦东地区在热拌无纤维SMA-13的配合比设计及生产施工的探索。 相似文献