图 上泽充大￥ ta2b口 SHANCHAI HAD TONG UNVERSIY LECTURE 10-I Gears-Introduction 齿轮机构设计 上泽克夏大粤 outline Where can we find gears? ©Common Types of Gears Fundamental Law of Gearing Involute profiles Gear tooth nomenclature How to manufacture a gear? Interference and undercutting ME357 Design Manufacturing ll
1 Gears-Introduction 齿轮机构设计 LECTURE 10-I ME357 Design & Manufacturing II outline Where can we find gears? Common Types of Gears Fundamental Law of Gearing Involute profiles Gear tooth nomenclature How to manufacture a gear? Interference and undercutting
国 上泽充大￥ Where can we find gears? SHANCAAI IAD TONG UNVERSIE 圈上泽大学 Where can we find gears? Gear Selector Fork A manual transmission is essentially a set of compound FROM ENGINE gear trains in which the driver selects the gear ratio
2 Where can we find gears? A manual transmission is essentially a set of compound gear trains in which the driver selects the gear ratio. Where can we find gears?
图 上泽充大￥ ACA4AlLs0IC0七sn Why Use Gears? 1.Reduce speed 2.Increase torque 3.Move power from one point to another 4.Change direction of power 5.Split power Generally this functionality is accomplished by many gears mounted in a gear box! 图 上泽文通大学 Torquet Power Curves 公 nnl Speed
3 1. Reduce speed 2. Increase torque 3. Move power from one point to another 4. Change direction of power 5. Split power Generally this functionality is accomplished by many gears mounted in a gear box! Why Use Gears? Speed Torque nnl Tb Power Curves
国 上泽充大￥ Common Types of Gears SHANCAAI IAD TONG UNVERSIY 图 上泽克夏大粤 Common Types of Gears
4 Common Types of Gears Common Types of Gears
国 上泽充大￥ Common Types of Gears SHANGHAI JAD TONG UNYERSIE Type Shaft Orientation Advantages Disadvantages Spur Parallel,Non-Intersecting High efficiency Noisy Helical Parallel,Non-Intersecting Lower Noise More expensive Non-Parallel,Non- Intersecting Bevel Any angle,intersecting or Shaft Greater Thrust and non-intersecting Orientation Loads Hypoid change Worm Perpendicular,non- High Gear Ratio, Low Efficiency intersecting not back drivable 图 上泽文大学 (o)External set (b)Internal set
5 Common Types of Gears Type Shaft Orientation Advantages Disadvantages Spur Parallel, Non-Intersecting High efficiency Noisy Helical Parallel, Non-Intersecting Non-Parallel, NonIntersecting Lower Noise More expensive Bevel and Hypoid Any angle, intersecting or non-intersecting Shaft Orientation change Greater Thrust Loads Worm Perpendicular, nonintersecting High Gear Ratio, not back drivable Low Efficiency