rolling bearing综述.ppt

第七章 Ball and roller bearings滚动轴承; ① Support shafts and elements on them 支撑轴及轴上零件 ②Reduce friction and wear between shaft and supporting housing 减小轴与支撑面间摩擦磨损;§7-1 General considerations 概述;一、 Structure , materials and characteristics 构造、材料和特点;二、 Study task 任务;三、 Applications 应用;§7-2 Selection of the types for rolling bearings 滚动轴承的类型选择;;;二、轴承代号Code of bearings;1、 Prefix and post codes前置代号和后置代号;2、 Basic codes 基本代号;2） Dimensional series codes尺寸系列代号;3） Bore diameter series codes内径系列代号;三、 Options of bearing types类型选择;2、 With respect to limit speed根据极限转速;§7-3 Selection of the sizes for rolling bearings (Carrying-load ability calculations)滚动轴承尺寸选择 （承载能力计算） ;1、 Load distribution 载荷分布;;;Inner axial forces are calculated by below table in engineering 工程中采用下表计算：;2、Stress changes 应力变化 1） Rolling elements Motion ring Periodic instable zero-plus alternating cycle stress 滚动体、动圈： 周期性非稳定脉动循环应力;Load zone;2） Fixed ring Stable zero-plus alternating cycle stress固定套圈：稳定脉动循环应力;;二、 Failure types and design criteria 失效形式和计算准则;Fatigue spotting;Plastic deformation indenting;Excess wear;Cage breakdown;;三、 Life calculations 寿命计算：;② Basic rating life: Before the number of bearings with the first evidence of fatigue develops get to 10% of bearings selected, the total number of revolutions the bearing will run or operating hours under certain operating rotating speed. 基本额定寿命：一批相同的轴承，90％轴承不发生点蚀前能达到的总转数或一定转速下的工作小时数L10、Lh10）.;③ Basic rating load (dynamic load capacity): the maximum load a bearing can endure for a rating life of 106 revolutions. 基本额定动负荷（反映承载能力大小）：基本额定寿命为100万转（106转），轴承承受的最大负荷。（C） ;④ Equivalent load 当量动负荷：;2、 Life calculations 寿命计算;;3、 Axial load calculations of angular contact bearings  角接触轴承轴向载荷计算;;; ① Determine motion trend of the shaft and judge tight and loose sides 确定轴的移动趋势 ，判断紧边、松边； ② At loose side, axial force on the bearing equals to its inner axial force 松边轴承所