sleevebearings探析.ppt

第八章 Sleeve bearings 滑动轴承;§8－1 general considerations 概述; ;2） Fluid friction bearings： 液体摩擦轴承 Loads are beard completely by oil film 载荷全由油膜承担 ;;II With respect to load-carrying direction 按承载方向分：;Radial bearings 向心轴承：Fr;;Solid shell;;;2、 Shortcomings High starting torque 起动阻力大;3、 Applications 应用;三、 Contents of the chapter 本章内容;;§8－2 Materials of sleeve bearings （ materials of bearing shells and inserts ）  滑动轴承材料（轴瓦及轴承衬材料）; Bearing insert: thin layer which is adhered on bearing shell by casting or pressuring in. 轴承衬：有的轴瓦是在轴瓦整体上用浇铸或压合的方法粘附上一层另一种材料，这一薄层材料称为轴承衬。;一、 Requirements for bearing materials：;;④ Capacity for being run in readily and low modules of elasticity 一定顺应性和嵌藏性 顺应性：适应轴偏斜的能力→ 减小偏载 嵌藏性：容纳异物的能力→ 避免轴颈伤和磨损 （弹性模量小→塑性增加→顺应性和嵌藏性好） ⑤ Good processing properties, such as castability, manufacturability, etc 良好的工艺性（容易铸造和加工） . ; 1、轴承合金（白合金、巴氏合金） babbitts based on tin 锡锑轴承合金：ZChSnSb11－6 based on lead 铅锑轴承合金：ZChPbSb16－16－2;2、 Bronzes 轴承青铜;3、 Brass: used for low speed and medium load 黄铜：低速中载 4、Cast iron: used for low speed and light load 铸铁：低速轻载;5、Bearings filled with oil 含油轴承:;6、 Plastics 轴承塑料; 三、Structures of bearing shell 轴瓦结构;2、Oil hole, oil groove and oil chamber  油孔、油沟、油室;;;§8－3 Simplified calculations for bearings operating with non-fluid friction 非液体摩擦轴承设计计算;;⑴ Radial bearings 径向轴承：;② pv is limited: （ prevent from excessive temperature increasing → oil film lose → excessive wear）限制pv值 （防温升△t过大→油膜破裂→过度磨损）;③v≤[v] m/s （ Prevent from excessive speed → quick wear）（p较小时）（防v过大→加速磨损）;⑵ Thrust bearings 推力轴承 ;;§8－4 Load-carrying mechanics of the hydrodynamic  lubrication bearings  液体动压润滑轴承承载机理;1、 Assumptions 假设;;③ Sliding do not exist between lubricant and planes 润滑剂与板面无滑动 ④ The dimensions in the direction perpendicular to the drawing are assumed to be