共查询到20条相似文献,搜索用时 114 毫秒
1.
2.
3.
4.
随着我国的汽车工业进步,对汽车制动器衬片的质量和性能提出了更高的要求。而我国汽车制动器衬片生产企业的生产能力和水平与发达国家还有一定差距。目前我国汽车制动器衬片执行GB5763,摩擦材料标准化技术委员会正在试图等同采用更为先进的ISO15484体系。ISO15484对汽车制动器衬片产品的设计、研发、试生产到批量生产各个环节进行规定,在此过程中,台架试验成为非常重要的手段。新标准的等同采用将使生产许可证工作发生相应变化。作为强制的行政许可,适时的采用新标准作为企业取证的基本要求和产品检验依据,将促进行业的整体进步。而这一变化尚需时日,有待于新标准逐渐的被企业和行业所认同、接纳和采用。 相似文献
5.
6.
目前制动器惯性台架大都采用直流电机驱动和纯机械模拟的方法,该方法存在反应速度慢、惯量调整困难、模拟精度低等缺点.为此,基于机械模拟和电模拟相结合的方法,采用交流电机驱动和矢量变频调速技术,设计出一台能够实现反应速度快、惯量无级调整的汽车制动器惯性台架.详细介绍了该台架的基本原理、总体结构、技术参数以及交流电机的选择.最后,通过设计出的台架进行了实测验证,结果证明该台架惯量误差远小于汽车制动器性能台架试验标准中规定的误差,极大提高了模拟精度,达到了设计要求,可以应用到实际生产中. 相似文献
7.
摩擦材料的特性决定了制动器的制动性能对温度的敏感程度,这是制动性能稳定性的主要影响因素之一。不同摩擦材料热衰退性能有较大差异,本文对采用粉末冶金摩擦材料的制动器和采用陶瓷摩擦材料的制动器进行了试验研究,对比分析了其性能差异。 相似文献
8.
针对空间机器人可能出现的失电失控问题,设计了一种新型双面摩擦弹簧电磁制动器。该制动器结合了ERA制动器和汽车盘式制动器的优点,相比普通弹簧摩擦制动器,该制动器在相同制动压力下可提供双倍制动力矩。利用有限元法分析了制动器电磁场的静态和动态特性,验证了制动器制动性能。通过对该制动器在真空高低温环境下进行多次制动实验,得到其制动力矩随制动次数变化的关系。根据实验前后摩擦副中各摩擦表面磨损状况的对比分析,找到了制动力矩改变的原因。为了使制动器稳定工作,提出了进行钛合金制动片表面处理以及在安装之前对制动器进行充分跑合的改进措施。 相似文献
9.
摘 要:盘式制动器的制动尖叫是汽车工业界备受关注的质量问题,也是学术研究领域的一个热点和难点课题。研究盘式制动器尖叫的产生机理,在制动器设计开发阶段进行尖叫预估,并提出抑制措施,对于降低噪音污染、满足顾客要求、加快制动器的产品开发进度,乃至提高汽车产品竞争力,都具有十分重要的意义。本文从制动尖叫的产生机理、数值分析方法、试验研究方法、影响因素以及尖叫抑制新技术等方面对盘式制动器尖叫的近期研究进展进行综述,众多的研究表明盘式制动器尖叫存在复杂的产生机理,并受到多种因素的影响,利用复特征值和瞬态动力学方法,结合实车道路试验和台架试验,是研究制动尖叫机理、开发低尖叫倾向产品的重要途径。最后总结现有研究存在的问题并对进一步的研究作出展望。 相似文献
10.
随着国内汽车工业的迅速发展,特别是近几年来逐步引进国外汽车制造技术,迫切需要新技术新材料配套。国外的汽车制动器,制动蹄与摩擦片之间广泛采用胶粘剂粘接结构,其中所用的耐高温胶粘剂是新型制动器制造技术的一个关键材料。国内虽有厂家在生产胶粘剂,但技术性能与国外相比仍有一定的差距。由南京汽车制动器厂、汽车研究所和上海橡胶制品 相似文献
11.
针对客车气压制动系统中存在的泄漏故障的问题,提出了一种基于解析模型的客车气压制动系统泄漏故障诊断的方法。通过对气制动系统中的关键部件制动总阀及制动气室的工作状态进行分析,建立了正常状态下的客车气制动系统制动气室压力特性的理论模型,该模型能够预测制动过程中制动气室中的瞬时气压值。搭建了整车气压制动系统模拟试验台,该试验台可针对整车制动系统进行制动性能模拟试验。在模拟制动过程中对制动气室中气压变化量进行测量,将归一化后的试验值与理论值进行比较,对气制动系统有无泄漏故障的存在进行了诊断。试验结果表明,该方法能很好地对气制动系统泄漏进行故障诊断。 相似文献
12.
摩擦材料引起制动器热衰退的机理的研究与探讨 总被引:1,自引:0,他引:1
热衰退是影响制动器稳定性的关键因素,为了探究产生热衰退的机理,用摩托车制动器综合性实验台对两种不同的摩擦材料进行了热衰退相关实验,并利用扫描电子显微镜(SEM)对制动器摩擦表面摩擦前后的表面形貌进行了观察分析.对不同材料的摩擦片的观察结果进行对比,发现热衰退产生的强弱程度与材料的成分与配方有密切关系.对于粉末冶金摩擦材料,由于材料中不合有机组分,热衰退表现并不明显;而对于树脂摩擦材料,由于其内部含大量有机粘结剂,其热衰退较为明显.从而断定摩擦片中的有机组分正是造成热衰退的关键所在,进而提出了摩擦材料的相关改进方案以提高制动器的抗热衰退性能. 相似文献
13.
14.
Zhou Yang Unsong Pak Cholu Kwon Yimin Zhang 《Quality and Reliability Engineering International》2023,39(1):454-471
To decrease random parameters’ influence on the drum brake reliability, the reliability-based robust optimization design (RBROD) of the electric vehicle brake is proposed. Based on the assumption that the maximum temperature of the brake cannot exceed the allowable temperature, a performance function model of thermal–mechanical coupling reliability of drum brakes is established by the adaptive Kriging method, and the analysis of reliability sensitivity and RBROD are conducted. The accuracy of the proposed model is verified by temperature measurement experiment under emergency braking condition. The robust optimization design improves the drum brake reliability to 0.99998 and reduce the influence of the design parameters on the reliability, with the absolute values of the reliability sensitivity and the weight of the drum brake are significantly smaller. Therefore, the objectives of reliability design, robustness design, and optimization design are simultaneously achieved by the proposed methods. Besides, the relative error of the proposed method is 0.373%, the number of function evaluations is 39, and the comparison with four meta-model methods show that the proposed method holds high-accuracy and high-efficiency. This study provides a high-precision theoretical explanation for the robust optimization design of drum brake. 相似文献
15.
Research and analysis of braking issues for golf cars and other low speed vehicles (LSVs) are reported in this study. It is shown that many such vehicles only provide braking for their rear wheels, which can lead to a driver losing control during travel on typical steep downgrades. The braking performance of a golf car equipped with brakes on two or four wheels was analyzed to determine the effects of two and four wheel brake designs on braking efficiency and vehicle yaw stability. Besides reducing braking efficiency, it is demonstrated that installing brakes on only the rear wheels can lead to directional instability (fishtailing) and rollover when the rear wheels are braked until skidding occurs. The nonexistence of golf course standards and the inadequacy of golf car and LSV standards are noted and a connection between this and the comparatively high level of accidents with such vehicles is inferred. Based on these results, it is advisable to install brakes on all four wheels of golf cars and LSVs. In addition, new safety standards should be considered to reduce the occurrence of golf car accidents on steep downhill slopes. 相似文献
16.
Antilock braking systems (ABS) have held promise for reducing the incidence of accidents because they reduce stopping times on slippery surfaces and allow drivers to maintain steering control during emergency braking. Farmer et al. (Accident Anal. Prevent. 29 (1997) 745) provide evidence that antilock brakes are beneficial to nonoccupants: a set of 1992 model General Motors vehicles equipped with antilock brakes were involved in significantly fewer fatal crashes in which occupants of other vehicles, pedestrians, or bicyclists were killed. But, perversely, the risk of death for occupants of vehicles equipped with antilock brakes increased significantly after adoption. Farmer (Accident Anal. Prevent. 33 (2001) 361) updates the analysis for 1996- 1998 and finds a significant attenuation in the ABS anomaly. Researchers have put forward two hypotheses to explain this antilock brake anomaly: risk compensation and improper operation of antilock brake-equipped vehicles. We provide strong evidence for the improper operation hypothesis by showing that the antilock brake anomaly is confined largely to drinking drivers. Further, we show that the attenuation phenomenon occurs consistently after the first three to four years of vehicle service. 相似文献
17.
18.
为准确掌握目前流行的两种车辆制动性能检测方法的特点,分析了平板式制动检测台和滚筒反力式制动检测台的结构和工作原理差别,比较了两种测试方法的不同之处;利用6辆桑塔纳SVW7180车型的检测数据,比较分析了两种检测台的实际检测结果和效果差别。根据对比分析结果可知,平板式制动检测台检测结果更接近于制动器真实制动水平。 相似文献
19.
在分析电子机械制动器执行机构工作原理的基础上,建立了电子机械制动器的数学模型.运用ADAMS仿真软件,对影响电子机械制动器稳定性的制动钳和滚珠丝杠的刚度进行了仿真实验.结果表明:制动钳和滚珠丝杠的刚度值相差越大,制动系统越稳定,制动效果越明显. 相似文献