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在汽车制动系统中,后卡钳是非常关键的制动装置,对汽车制动起到关键作用。在后卡钳使用过程中,卡钳中的制动液脏或机械部件运动磨损会产生卡死,其后果轻则影响制动系统的制动效果,重则导致汽车制动系统抱死,汽车停止运动,无法前行,产生安全隐患。因此,解决后卡钳的卡死问题,成为设计及制造后卡钳时应着重考虑的问题。 相似文献
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我国客运专线的运营,电力动车组的投入使用,标志着我国已进入高速铁路的时代。随着高速动车组的引进,一些新设备、新技术,新知识也随之而来。为了保证高速运行的安全可靠性、有效性和舒适性,制动技术则是其中极为重要的一部分。着重对CRH2型动车组350 km/h速度等级动车组用空气制动卡钳的结构功能进行浅析,空气制动卡钳是气动组件和装在车轴上的制动盘作为动车组的磨耗制动器使用,其紧凑的结构,适合转向架狭窄的空间。 相似文献
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本文阐明了活塞尾端或内侧,摩擦衬块在制动产生听觉可分辨的噪声方面的影响。采用独特的技术测量常态制动工况下摩擦衬块/圆盘接触面间的动态中心压力(Cop)。该新技术采用一个在摩擦衬块内嵌入压力感敏膜。本文还提出了摩擦衬块/卡钳接触区的共面分析,以及它对圆盘/摩擦衬块Cop位置的影响。该分析表明,活塞尾端情况,影响Cop位置,并进一步说明该中心的移动类似于摩擦衬块支架振动与支架反向。本文包含用12个活塞对立卡钳的附加研究,初始Cop位置可以沿摩擦衬块和径向两个方向变化。结果表明,Cop的运动很明确使制动压力增大。 相似文献
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针对制动引起方向盘抖动的故障展开分析,通过故障现象分析,车辆的故障现象属于高速下的冷态抖动,与制动盘的端面跳动及厚薄差超差相关。通过鱼刺图进一步分析DTV增长的原因,最终确定此制动抖动是与车轮压紧制动盘的平面度超差及制动卡钳盘片间隙相关。通过更换合格的车轮和回位值偏大的卡钳,并进行了验证,制动抖动现象消失。结合故障抖动车的分析,得出一套有效的制动抖动的分析流程。 相似文献
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随着汽车在人们生活中的普及,大家对汽车产品性能的要求也越来越高,制动性能作为汽车的重要安全性能越来越受到消费者的关注,其中制动踏板感是制动性能开发的一项重要指标,直接影响车辆驾驶的安全性和舒适性,而踏板空行程直接影响驾驶员对车辆制动踏板感觉的评价.在车辆制动系统中,盘片间隙对踏板感有直接的影响,制动卡钳活塞回位量又直接影响盘片间隙,而影响活塞回位量大小的则是卡钳内部矩形密封槽的结构.本文通过对制动卡钳矩形密封槽结构的研究,结合实际的台架试验数据,来分析活塞回位量的变化影响. 相似文献
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Talkachou Dzianis 《测试科学与仪器》2016,(3):272-278
防抱死制动系统(Antilock braking system,ABS)是通过车轮角加速度与阈限值的比较进行制动力控制.这种系统的优势是只需角速度传感器信号就足够了;缺点是工作时会出现制动压力连续的超调,使车轮从抱死模式到滚动模式来回转换,这样制动器不能产生在当前道路状况下最大可能的制动力矩值.增加制动效率的构思是制动压力增加的强度取决于当前道路状况,但面临的问题是制动器产生的制动力矩值、当前道路状况和牵引系数值是未知数.本文通过建立三层神经网络模型来识别和获取这些参数,并在设计的随机路面上进行仿真实验,验证了所设计控制器工作的准确性. 相似文献
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气动夹钳的输出特性对保障列车安全制动起到至关重要的作用。以上海地铁11号线RZSS型气动夹钳为例,基于MATLAB和ADAMS联合仿真技术建立了其虚拟样机模型,并仿真分析了RZSS型气动夹钳在常用制动及停放制动工况下的制动缸压力建立过程、制动力输出特性、出闸灵敏度等工作特性;同时结合线路及车辆参数,对RZSS型盘式制动器进行了系统理论计算与校核;最后进行了部件例行试验测试,试验结果验证了计算机仿真与理论计算的正确性,为传统轨道车辆制动系统设计和气动夹钳结构优化提供了参考依据。 相似文献
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GONG Mingde WEI Hailong College of Mechanical Science Engineering Jilin University Changchun China 《机械工程学报(英文版)》2011,(5):790-797
The hydraulic caliper disc brake system with air-over-oil is widely adopted at present for heavy vehicles,which makes use of air pressure system propelling the hydraulic pressure system acting on friction plates divided and combined for braking.There are some disadvantages such as pneumatic components failure,dust polluted and produce lots of heat in hydraulic caliper disc brake system.Moreover,considering the demands of the high speed,heavy weight,heavy load and fast brake of heavy vehicles,the full power hydraulic brake system based on double pipelines for heavy vehicles is designed and analyzed in this paper.The scheme of the full power hydraulic brake system,in which the triloculare cylinder is controlled by dual brake valve,is adopted in the brake system.The full power hydraulic brake system can accomplish steering brake,parking brake and emergent brake for heavy vehicles.Furthermore,electronic control system that is responsible for coordinating the work of hydraulic decelerator and hydraulic brake system is developed for different speed brakes.Based on the analysis of the influence of composed unit and connecting pipeline on braking performance,the nonlinear mathematic model is established for the full power hydraulic brake system.The braking completion time and braking pressure in braking performance of the double-pipeline steering brake and parking brake are discussed by means of simulation experiments based on Matlab/Simulink,and the simulation results prove that the braking performance of steering brake and parking brake meets the designing requirement of the full power hydraulic brake system.Moreover,the test-bed experiments of the brake system for heavy vehicles are carried out.The experimental data prove that the braking performance achieves the goal of the design,and that the full power hydraulic brake system based on double pipelines can effectively enhance braking performance,ensure braking reliability and security for heavy vehicles. 相似文献
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通过对JB/T6406-2006《电力液压鼓式制动器》和JB/T10917-2008《钳盘式制动器》等有关标准的研究,总结了工业制动器静态制动力矩测试的基本要求。分析静态制动力矩的砝码法、液压杠杆法和电流法及其特点和区别。结合IBT110-500工业制动器综合性能试验台的静态制动力矩试验台架的设计实例,从测试原理、液压系统、机械结构、安全防护等方面进行了具体设计。 相似文献
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Sungwook Jang Hoon Yeo Chulsoo Kim Hyunsoo Kim 《Journal of Mechanical Science and Technology》2001,15(11):1490-1498
In this paper, a regenerative braking algorithm is presented and performance of a hybrid electric vehicle (HEV) is investigated. The regenerative braking algorithm calculates the available regenerative braking torque by considering the motor characteristics, the battery SOC and the CVT speed ratio. When the regenerative braking and the friction braking are applied simultaneously, the friction braking torque corresponding to the regenerative braking should be reduced by decreasing the hydraulic pressure at the front wheel. To implement the regenerative braking algorithm, a hydraulic braking module is designed. In addition, the HEV powertrain models including the internal combustion engine, electric motor, battery, CVT and the regenerative braking system are obtained using AMESim, and the regenerative braking performance is investigated by the simulation. Simulation results show that the proposed regenerative braking algorithm contributes to increasing the battery SOC which results in the improved fuel economy. To verify the regenerative braking algorithm, an experimental study is performed. It is found from the experimental results that the regenerative braking hydraulic module developed in this study generates the desired front wheel hydraulic pressure specified by the regenerative braking control algorithm. 相似文献
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This paper introduces the development of the caliper system for a geometry PIG (Pipeline Inspection Gauge). The objective
of the caliper system is to detect and measure dents, wrinkles, and ovalities affect the pipe structural integrity. The developed
caliper system consists of a finger arm, an anisotropic permanent magnet, a back yoke, pins, pinholes and a linear hall effect
sensor. The angle displacement of the finger arm is measured by the change of the magnetic field in sensing module. Therefore
the sensitivity of the caliper system mainly depends on the magnitude of the magnetic field inside the sensing module. In
this research, the ring shaped anisotropic permanent magnet and linear hall effect sensors were used to produce and measure
the magnetic field. The structure of the permanent magnet, the back yoke and pinhole positions were optimized that the magnitude
of the magnetic field range between a high of 0.1020 Tesla and a low of zero by using three dimensional nonlinear finite element
methods. A simulator was fabricated to prove the effectiveness of the developed caliper system and the computational scheme
using the finite element method. The experimental results show that the developed caliper system is quite efficient for the
geometry PIG with good performance. 相似文献
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基于风电制动器钳体的结构,建立制动钳的有限元仿真模型,分析在制动器的低频抖动频率范围内,钳体宽度、厚度和密度对制动钳振动的影响。在此基础上,探讨了钳体的宽度、厚度对制动钳结构稳定性的交叉影响。仿真结果表明,一定范围内改变钳体的宽度和厚度可以改善制动器的结构稳定性。 相似文献