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 set5 Common Types of Gears Type Shaft Orientation Advantages Disadvantages Spur Parallel, Non-Intersecting High efficiency Noisy Helical  Parallel, Non-Intersecting  Non-Parallel, Non￾Intersecting Lower Noise More expensive Bevel and Hypoid Any angle, intersecting or non-intersecting Shaft Orientation change Greater Thrust Loads Worm Perpendicular, non￾intersecting High Gear Ratio, not back drivable Low Efficiency