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制动液俗称"刹车油",它是机动车液压制动系统中传递压力以制动车轮的介质.制动液分为醇型制动液、矿油型制动液和合成型制动液等三大类.随着机动车行驶的高速化和载重的大型化,制动液性能的好坏对于行车安全具有越来越重要的影响. 相似文献
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钳盘式制动器俗称“碟刹”,行车制动由液压控制,由制动盘、分泵、制动钳、油管等构成。制动盘用合金钢制造并固定在车轮上随车轮转动。钳盘式制动器散热快、重量轻、构造简单、调整方便。钳盘式制动器沿制动盘轴向施力,制动轴不受弯矩,径向尺寸小,制动性能稳定。根据制动过程中缸体是否轴向移动又可分为定钳盘式制动器和浮钳盘式制动器。 相似文献
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1制动失灵现象 :一台农用运输车在行驶中突然制动失灵 ,连续将制动踏板踩到底 ,均无制动感觉 ,不能减速停车。原因 :1 1储油罐内缺油 ,使制动器失效。1 2制动管破裂或接头松脱 ,使制动液全部渗漏 ,导致制动失灵。1 3制动皮碗破裂或踩翻引起制动失灵。检查与判断 :先检查总泵储液罐是否有油 ,再检查总泵推杆防尘套处是否有渗出 ,若有则是总泵皮碗老化破裂或踩翻 ,而引起制动液漏出。然后检查车轮制动器 ,若制动毂边缘有大量的油液漏出 ,即为分泵皮碗老化破裂或踩翻所致。排除 :经检查 ,该车制动失灵是由于总泵皮碗老化破裂 ,使制动液… 相似文献
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农用货车的行车制动普遍采用双管路液压制动。液压制动是靠液体来传递动力,这个液体就是制动液俗称“刹车油”。制动管路混入气体或制动液含有水分,都会影响制动效果,给行车带来不安全隐患。 相似文献
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制动系统是汽车最重要的安全部位之一,一旦出现故障,后果将不堪设想。微型汽车制动系统常见故障及其检修方法如下:一、制动不良或失灵1.制动管路泄漏或阻塞,制动液不足,制动油压下降而失灵。应定期检查制动管路,排除渗漏,添加制动液,疏通管路。2.制动管内进入空气使制动迟缓,制动管路受热,制动液汽化,管路内产生气泡。由于气体可压缩,因而在制动时导致制动力矩下降。维护时,可将制动分泵及管内空气排净并加足制动液。3.制动间隙不当。制动摩擦片工作面与制动鼓内壁工作面的间隙过大,分泵活塞行程增大,导致制动迟缓、制动力矩下降。维修时,按… 相似文献
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制动液是机动车液压制动系中传递压力以制动车轮的介质,它的好坏对行车安全具有很大影响。有的驾驶员认为不换制动液机动车制动一样没有问题。但是你可能碰到或者听到过这种情况:在车辆正常行驶中,突然一脚制动失效,需要补踩第二脚才行,有时即使踩了两脚制动器还是发生了车祸。 相似文献
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<正>机动车的制动系统常见的有几种形式,机械制动、气制动、液压制动等。由于液体是不能被压缩的,几乎100%的传递动力,且操纵可靠。目前大部分小型车、大马力拖拉机、联合收割机都采用液压制动。液压制动的基本原理是驾驶员踩下刹车踏板,向刹车总泵中的刹车油施加压力,液体将压力通过管路传递到每个车轮刹车卡钳的活塞上,活塞驱动刹车卡钳夹紧刹车盘,从而产生巨大摩擦力使车辆减速。一、液压制动系统的工作原理 相似文献
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《Journal of Agricultural Engineering Research》1998,69(3):249-254
A model to represent the discolouration of dried powder of carrots as a function of temperature was developed. Two types of carrots, Asian and European, containing large amount of lycopene and β-carotene, respectively, were tested. The dried powder was stored under an atmosphere with O2and at three different temperatures, 5,20 and 35°C. The surface colour of the powder was monitored during storage by a Hunter colour ratioa/b. In the proposed model, the rate of oxidation was assumed to be represented by the product of the fraction of concentration of oxidized pigment at arbitrary time and a specific rate of oxidation of pigment. The rate parameters in the proposed model were calculated by fitting the experimental data with smooth curves by trial and error at the end of the induction period but before discolouration took place. The frequency constant and activation energy, expressing the temperature dependence of the rate parameters, were expressed by the Arrhenius relation. The simulation results of a Hunter colour ratioa/bof dried powder at 25°C showed good agreement with the experimental data, suggesting that the proposed model was effective for the prediction of discolouration of dried powder of both types of carrot. The use of the induction period in the manner described may enable the shelf life of dried powder to be predicted. 相似文献
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从灾害经济学的角度探讨了城镇供水优化调度的必要性和可能性,认为在缺水不可避免的情况下,对供水进行优化调度可以减小缺水带来的损失,产生较好的减灾效益,特别是可以大大减小严重干旱的灾害效应。并根据水资源的特性,提出了缺水损失的计算模式以及优化调度的原则和方法。 相似文献
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感官检验棉花的品级,这是农村常见的一种检测手段.它的一个主要特点就是存在不确定性.这是由于检验员的品级检验水平存在一定的差异,其中有很多因素制约着检验的结果.文章对影响感官检验结果的因素进行了系统的分析. 相似文献
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The fractional outflow rate of water from the rumen, measured as the rate of disappearance of the chromium complex of ethylenediamine tetra-acetic acid, was related to a number of dietary factors. A multiple regression equation was derived which expressed fractional outflow rate as a function of the intakes of dry matter, ash, acid-detergent fibre and crude protein.The data analysed consisted of 243 observations for sheep on 59 diets, including forage, concentrate and mixed diets. The ranges covered by the data were: fractional outflow rate 0.7–3.6 day?1; dry matter intake 560–1400g/day; ash 4–30%, acid-detergent fibre 7–41%, crude protein 5–26 % of dry matter; there were no observations for sheep of less than 34 kg liveweight.The equation accounted for 56·3 % of the total variance. Between-sheep variance could not be calculated for the whole of the data but was undoubtedly substantial since, for a sixth of the data, it was known to account for 38 % of the total variance. 相似文献