SKF内部培训rollerbearingsCHN详解.ppt

Roller Bearings 滚子轴承类型 圆柱滚子轴承 NU轴承基本形式单列圆柱滚子轴承 圆柱滚子轴承 圆柱滚子轴承的构成 各种不同的园柱滚子轴承 圆柱滚子轴承的命名 不同种类的保持架 满滚子园柱滚子轴承 精密圆柱滚子轴承 应用：螺旋式的应用压缩机 圆锥滚子轴承 圆锥滚子轴承 圆锥滚子轴承构成 几何结构 不同的尺寸系列 英制标准的轴公差 英制标准的轴承座公差 承载能力 圆锥滚子轴承的系列设计 滚子承载力 轴向和径向负荷影响 寿命性能 滚子端面/挡边接触 滚道接触面应力分布 应用：商务汽车 应用：蜗轮蜗杆齿轮箱的应用 应用：二级变速器箱的应用 应用：破碎机的应用 球面滚子轴承 球面滚子轴承 根据系列不同可处理1°- 2.50°的偏心情况 圆锥内孔方便在紧定套和退卸套上的安装 Why spherical roller bearings?为什么选用球面滚子轴承？ Accommodate both radial and axial loads可承受径向和轴向载荷 Influence of a floating guide ring on load distribution VA 405 Sealed SRB 球面滚子轴承的命名 球面滚子推力轴承 球面滚子推力轴承 CARB?滚子轴承能力 SKF的新型CARB?  极强的承载能力 仅承受径向负荷 可同时适应偏心和轴向位移 允许较大的轴向膨胀 容许轴或轴承座的外形误差 CARB? 可在以下条件下运行 球轴承类型 滚子轴承类型 Review Very High Radial Loads, No Thrust High speed Non-locating bearing (take bearing example and push apart) unless features are added mention sliding friction Very low Misalignment Tolerance Several Designs for CRB (N, NU, NJ, NUP) Applications: Larger Electric motors. Recommended in Overhung load (Sheave/Belt) Applications, Locomotive Traction Motors. Needle Roller Bearings are a specialized form of CRB. Generally, if Roller length is 2X the diameter, it’s classified as a needle. English and metric sizes are available. Capable of carrying high radial loads Tolerant of slight misalignment (approx. 0° 3’) Capable of axial displacement (i.e. locating and non-locating designs) Low friction Old vs. New SRTB: Special Spacer (supplied on request) may be required when retrofitting older bearing designs. Many Applications using Spherical Roller Thrust Bearings (SRTB’s) use springs under the separable ring to apply minimum loads throughout the machine load cycle. Unloaded rollers can lead to skidding, overheating and poor performance. Can handle heavy thrust loads with some radial load Can handle misalignment of 2°-3° depending on the series Highly susceptible to damage when inadequately loaded Hardened steel spacer may be needed with replacing old brass cable with the new extra-capacity “E” design (pressed steel cage)