Comparison of the fatigue life of F.F. shaft material according to various environmental temperatures

A rotary bending fatigue test was carried out with two kinds of materials, S43C and S50C, using the front engine and front driveshaft (F.F. shaft) of the vehicle. The specimens were heat-treated using the high frequency induction method (about 1 mm depth and HRC56∼60) and the test environment temperatures were -30 °C (-22 °F), +25 °C (+77 °F), and +80 °C (+176 °F) in order to determine the influence of the heat treatment and the temperatures. The fatigue life increased on the order of +80 °C, +25 °C, and -30 °C regardless of heat treatment. In comparison of the fatigue lives with the basis of the tested result at +25 °C, the fatigue lives of non-heated specimens decreased about 35%, but that of heat-treated specimens decreased by only about 5% at +80 °C, more than at +25 °C. And fatigue life of non-heated and heat-treated specimens were about 110% and 120% higher at -30 °C than that of +25 °C. The initiation of surface microcracks was observed at 0.2 fatigue life ratio in as-received S43C and S50C, but the average crack length in S50C was about 14% longer than that of S43C at the same fatigue life ratio.     

基于车内振动控制的多万向节相位优化

在简述传动轴扭转振动研究现状的基础上,针对万向节相位布置建立车内振动控制的平面多万向节传动的数学模型,并将该模型应用于实车优化方案的制定,仿真与试验结果表明优化方案是有效的与合理的,同时也在车内振动控制方面为平面多万向节相位布置的设计提供指导思路。     

250B轴承环扩孔机改造初探

经过对设备的滑动导轨、汽缸尺寸及结构、碾压宽度、传动轴结构等部分进行改造,使该设备的结构更加合理,加工范围增加,降低成本,故障率低,使用寿命延长。     

纤维增强复合材料传动轴应用及设计技术研究

综述了纤维增强复合材料传动轴在工业领域的应用情况,对复合材料传动轴力学性能影响因素进行了分析,并探讨了结构承载破坏机制,同时对目前公开发表的几种复合材料传动轴设计方法进行了介绍与分析,并对今后研究动向进行了展望。     

汽车转向传动轴扭转疲劳寿命试验台设计

针对汽车转向传动轴扭转疲劳寿命的测试,设计了基于PIC16F877单片机的试验台,给出了具体的试验方法,在传动轴与方向盘联接的一端,利用步进电机驱动传动轴,模拟方向盘正反方向的转动,传动轴另外一端,由程控电源控制磁粉制动器,产生扭转负载,与磁粉制动器串联安装有扭矩传感器,能对试验负载进行检测反馈,单片机与程控电源通过串口通信,能自动调节程控电源输出的电流大小,从而使磁粉制动器输出的扭矩负载恒定;该系统测试数据准确,具有试验次数记忆和故障报警功能,成本低,具有实用价值。     

对称和单向扭矩下等速传动轴疲劳寿命的差异

等速万向节传动轴的扭转疲劳台架试验一般采用对称交变扭矩,但有些用户在传动轴选型时,对传动轴的扭转疲劳寿命采用单向脉动扭矩来评价,因此需要分析这两种载荷条件下传动轴疲劳寿命的差异,以便正确地进行传动轴选型计算。针对典型等速万向节传动轴的两类主要疲劳失效零件,根据不同零件在一个载荷循环内的应力变化特点,采用不同的方法分析了对称交变和单向脉动扭矩下传动轴零件扭转疲劳寿命的差异,为传动轴的设计和选用提供了依据。     

Betriebsfestigkeit + Funktion = Betriebsfunktionalität,Anforderungen an die Entwicklung von Fahrwerkbauteilen

Fatigue Strength + Function = Functional Service, Requirements for the Development of Chassis Components The fatigue strength is an important aspect within the development of chassis components but there are some more aspects to consider. So the functionality under all condition (environmental conditions, temperature, loading) is the general requirement for all chassis components. In the following text these problems will be discussed for three examples: a hub unit, a driveshaft and a stabiliser bar.