沟道表面波纹度对球轴承摩擦力矩影响的试验研究

在对沟道波纹度与球轴承摩擦力矩的关系进行试验研究的基础上,分别就外沟道表面波纹度的谐波幅值和谐波阶次对球轴承摩擦力矩的影响程度进行了分析,试验结果表明,在外沟道表面波纹度阶次一定的情况下,外沟道表面波纹度幅值只影响球轴承摩擦力矩波动的最大幅值,不会改变球轴承摩擦力矩最大波动值所对应的激振频率;球轴承摩擦力矩波动激励频率随着外圈沟道表面波纹度的谐波阶次增加而增加.     

基于盒维数的保持架质心轨迹稳定性分析

利用ADAMS建立了参数化的角接触球轴承多体动力学模型,并在考虑轴承外沟道表面波纹度谐波阶次、球数以及不同零件表面波纹度对保持架质心轨迹影响的情况下,引入盒维数作为判断保持架质心混乱程度的依据,分析了零件表面波纹度对保持架质心轨迹的影响规律,结果表明,提高外圈表面波纹度谐波阶次和球数有助于改善保持架质心的稳定性,但相对于外圈而言,控制钢球和内沟道的形状误差效果会更为明显。     

基于成对双联角接触球轴承的摩擦力矩特性分析

对影响成对双联角接触球轴承精度和平稳度的摩擦力矩特性进行了分析研究.依据研究目的要求主要采用了试验验证和计算验证结合的试验方法.首先建立了特种轴承试验台系统.然后对成对双联角接触球轴承做了工况模拟和运转状态检测.从而得出了成对双联角接触球轴承变转速,变转向,变轴向载荷,变预紧力下的摩擦力矩曲线的大小和轴承曲线波纹度.进...     

成对角接触球轴承摩擦力矩测量装置的设计

角接触球轴承在实际使用中通常成对安装,现有轴承摩擦力矩测量装置一般适用单套轴承,成对角接触球轴承摩擦力矩缺少合适的测量设备。针对这一问题,对滚动轴承摩擦力矩的影响因素进行理论研究与分析计算,在此基础上设计了成对角接触球轴承摩擦力矩测量装置。介绍了成对角接触球轴承摩擦力矩测量装置的原理、技术指标、结构、电气系统、软件系统,并以成对7038角接触球轴承为测试对象进行启动摩擦力矩和动态摩擦力矩测试试验,得到启动摩擦力矩和动态摩擦力矩随轴向载荷增大而增大的变化趋势。     

球轴承摩擦力矩的研究现状与发展

从球轴承摩擦力矩的理论研究与试验研究两个方面综述了球轴承摩擦力矩的国内、外研究现状及取得的成果,详细介绍了球轴承摩擦力矩理论计算发展过程,以及轴承工作表面质量、润滑剂、工况和轴承结构参数对轴承摩擦力矩大小和波动性的影响.并针对目前球轴承摩擦力矩研究存在的问题,提出了未来球轴承摩擦力矩研究方向.     

高速角接触球轴承振动与套圈滚道表面波纹度的相关分析

本文在试验研究的基础上，分析了高速角接触球轴承振动与套圈滚道过表面波纹度的相关性，得出了套圈滚道表面波纹度对轴承振动影响的主次关系，为高速角接触球轴承降振提供了控制手段。附图6个，参考文献6篇。     

影响角接触球轴承沟道表面波纹度的因素分析

角接触球轴承沟道表面波纹度是影响轴承振动和噪声的关键因素,分析生产加工中影响轴承沟道表面波纹度的多个因素,并针对具体问题提出了改进及控制措施。     

轴瓦表面波纹度对柴油机连杆大头轴承润滑特性的影响

柴油机连杆大头轴瓦表面在加工过程中存在波纹度,表面波纹度严重影响轴承接触表面的润滑性能。针对这一问题,建立考虑表面波纹度的连杆组弹性流体动力学模型,分析不同波纹度幅值、阶次和数量对连杆大头轴承润滑特性影响规律。结果表明：随着波纹度幅值、阶次和数量的增加,最小油膜厚度总体先增大后减小,总摩擦功耗先减小后增大,表明合理分布的表面波纹度对轴承性能有积极影响,可提升轴承的润滑性能;基于Box-Behnken试验设计与响应面法对柴油机连杆大头轴承润滑特性进行研究,以轴瓦表面波纹度的幅值、阶次和数量为优化变量,以最小油膜厚度和总摩擦功耗为优化目标进行响应面分析,并结合带精英策略的非支配排序遗传算法进行优化。结果表明：不同轴瓦表面波纹度对连杆大头轴承润滑特性影响差异较大;相较轴瓦光滑表面,优化后最小油膜厚度增加了11%;总摩擦功耗降低了14%。     

角接触球轴承温升有限元分析

角接触球轴承由于其极限转速高、摩擦力矩小等优点成为高速电主轴的主要支撑方式。然而摩擦引起的温度成为影响角接触球轴承的使用寿命和性能的主要因素。利用传热学、摩擦学理论分析了角接触球轴承工作状态下的发热机理和传热特点,同时通过Workbench软件建模求解出温度场并对求解结果进行分析,发现轴承转速对轴承内圈、外圈和滚动体温升的影响。采用灰关联度分析对温度和转速的影响关联度,结果表明转速对轴承温升的具有一定的影响,为优化高速角接触球轴承的结构优化设计提供了理论参考。     

角接触球轴承摩擦力矩特性研究

在角接触球轴承动力学和热力学分析基础上,利用能量守恒定律,建立角接触球轴承摩擦力矩理论计算公式,并对角接触球轴承的结构参数、工况参数与摩擦力矩的关系进行理论分析和试验验证.分析与试验结果表明,轴承低速工作时较大的内沟曲率半径系数有利于角接触球轴承摩擦力矩的降低,高速工作时较小的内沟曲率半径系数有利于轴承摩擦力矩的降低;...     

Rolling-Sliding Analysis in Ball Bearing Considering Thermal Effect

An analytical method is applied in the calculations of ball contact angles varying with the position angle of a ball bearing with a centrifugal force. This is further extended to investigate the thermal slipping behavior occurring at the contact surface of the inner raceway. The sliding velocities at the contact area are analyzed in the present study by the ball bearing contact mechanisms. The shear stress created at this contact surface is evaluated by considering the temperature-pressure dependence of the lubricant viscosity. The contact temperature of a ball and the inner raceway is obtained if the frictional heat created by the shear stress is available. Under the condition of controlling the outer raceway temperature, the thermal deformations of all components of a ball bearing are taken into account in the evaluation of bearing performance. Comparisons are made for several parameters, including the normal load, linear slip velocity, and linear traction force, between the results of considering the thermal effect or ignoring it. The friction torque evaluated by taking the thermal effect into account is higher than the torque evaluated when ignoring the thermal effect.     

Quasi-static Analysis of Thrust-loaded Angular Contact Ball Bearings Part Ⅱ:Results and Discussion

Ball bearings are widely employed mechanical components characterized by high precision and quality,and usually play important roles in various rotary machines and mechanisms.Many advanced applications require a deep understanding of their various kinematic and tribological characteristics that are essential to predict the fatigue endurance,relieve the vibration and minimize the power dissipation of ball bearings in particular applications.An angular contact ball bearing under a specified operating condition is simulated with the quasi-static/creepage analytical model proposed in the preceding article.The results demonstrate that the ball bearing is a statically determinate system.That the balls spin on both inner and outer races means the ball is controlled by neither the inner nor the outer raceway.The friction between the ball and raceway renders the inner and outer contact angles unequal.The larger the coefficient of friction is,the larger the angle deviation.The tangential traction perpendicular to the rolling direction due to the spin induces a gyro-like rotation of the ball with respect to the raceway even if no inertial effects are considered.The tangential elastic compliance of contacting surfaces gives rise to locked areas within the contact patch and transforms the sliding lines from circles into spirals.The differential slip due to the close conformity of the ball and raceway makes the sliding and traction distributions asymmetric,which will influence the location of the spinning center of the ball with respect to the raceway.The quasi-static/creepage model can be used to reveal the operating behaviors of ball bearings running under steady conditions and to optimize the design of ball bearings for specific applications.     

球轴承摩擦力矩测量仪的设计与应用

为测量在不同载荷、转速等条件下球轴承的摩擦力矩特性,设计制造了球轴承摩擦力矩测量仪。介绍了测量仪的测量原理与技术方案。该测量仪模拟了轴承的载荷、转速、偏转力矩等工况,测量了轴承的摩擦力矩。对测量数据分析表明,该摩擦力矩测量仪能满足预定的设计要求,具有良好的稳定性,测量数据准确可靠,可为各种轴承摩擦力矩的测量提供准确的数据支持。     

精密丝杠副摩擦力矩波动及滚珠冲击的试验研究

为了研究滚珠丝杠副摩擦力矩波动及滚珠冲击的影响因素,对不同型号的丝杠摩擦力矩波动与滚珠的冲击响应进行了测试分析,结果表明:摩擦力矩的波动频率与滚珠对返向器的冲击频率之间存在频率相等、相位滞后的对应关系;丝杆转速的増大使得返向器内前后滚珠间速度差减小,滚珠进出滚道的加速度冲击响应与丝杠转速呈相反趋势;预紧力的大小对丝杠的冲击有较大的影响。     

Prediction of the friction torque in grease lubricated angular contact ball bearings using grey system theory

The development of special grease makes it possible for angular contact ball bearings to operate at high speed and temperature; however, as an important performance parameter, friction torque of bearings lubricated with grease is much greater than that of bearings lubricated with oil-air, and heat generation due to frictional loss is also greater, so it is necessary to predict the friction torque occurring in grease lubricated angular contact ball bearings. Based on grey system theory, a new prediction methodology for bearing friction torque is proposed which capitalizes on the notion that the information about friction torque of angular contact ball bearing is generally poor, incomplete and uncertain. A grey prediction model, GM (1, N) model, is presented to predict the friction torque in grease lubricated angular contact ball bearings. Several experiments on the friction torque of grease lubricated angular contact ball bearings were conducted to model and validate the effectiveness of the GM (1, N) model through on-line and off-line approaches. Experimental results show that about 90% of bearing friction torque under varying speed can be predicted in the on-line prediction; above 85% of bearing friction torque under varying speed and different loads can be predicted in the off-line prediction. Comprehensive analysis shows that, the GM (1, N) model performs very well for both modeling data and model validation data under different loads, varying bearing speed and work cycles, the proposed methodology can be used to predict bearing friction torque with good accuracy and robustness.

     

传动机构用四点角接触球轴承的改进设计

某型号主机配套使用的四点角接触球轴承承受大的径向力和倾覆力矩，原来的结构不能满足主机的工况要求。通过减小接触角、增大钢球直径和采用满球设计提高其承载能力；用桃形沟道代替直沟道以减小接触应力；装配时将两半内圈压紧达到预定游隙以提高系统刚度等措施使轴承的最大接触应力降低至不足原结构的1／3，摩擦力矩为原结构的1／5。     

Measurement of Cage and Pocket Friction in a Ball Bearing for Use in a Simulation Program

Few measurements have ever been made of the drag forces arising in a ball bearing due to viscous friction of the balls rotating in the cage pockets and the cage rotating inside the raceway. This paper reports measurements of both these sources of friction on simulations of just one bearing, but the data are compared with general analytical expressions for predicting the friction, and agreement is good. Finally, the data for the ball/pocket friction are compared against a theoretical model based on simple viscous shear and are shown to be in excellent agreement.     

表面空气对制动力矩的影响

研究了摩擦表面流动的空气对摩擦力的影响。通过制动模拟试验，对4种不同表面形状衬片的制动力矩-时间曲线的波动幅度进行了比较分析，根据摩擦表面中流动空气的不同工作特性，建立了相应的简图进行了详细的说明：试验结果表明：在摩擦热的作用下，表面空气的温度升高，气压增加，从而削弱了工作载荷对表面的作用力，使摩擦力矩产生波动。随着制动速度的下降，热空气对摩擦力矩波动的影响减小。制动时，摩擦盘带入表面的空气越多，空气对摩擦力矩的影响就越大；摩擦表面存留的热空气越多，热空气对摩擦力矩的影响就越大。