Gears (齿轮 Introduction to Engineering
1 Introduction to Engineering Gears （齿轮）
What are Gears? A wheel with teeth along its rim Used to transmit rotary motion from one shaft to another Introduction to Engineering
2 Introduction to Engineering What are Gears? • A wheel with teeth along its rim • Used to transmit rotary motion from one shaft to another
History of Gears Gears born with the invention of rotating machinery Early gears were made from wood and were often lubricated with animal fat grease Metal gearing became popular with the industrial revolution A science of gear design and manufacture rapidly developed through the nineteenth century Today,modern metallurgy(治金术)has greatly increased the useful life of gears Introduction to Engineering
3 Introduction to Engineering History of Gears Gears born with the invention of rotating machinery Early gears were made from wood and were often lubricated with animal fat grease Metal gearing became popular with the industrial revolution A science of gear design and manufacture rapidly developed through the nineteenth century Today, modern metallurgy（冶金术） has greatly increased the useful life of gears
Classification of Gears Spur(直齿) Helical(螺旋齿) Worm and worm gear pair Straight bevel Spiral bevel 直齿锥齿轮 蝶旋齿锥齿轮 M◆以 蜗杆和蜗轮对 Introduction to Engineering
4 Introduction to Engineering Classification of Gears Spur（直齿） Helical（螺旋齿） Straight bevel 直齿锥齿轮 Spiral bevel 螺旋齿锥齿轮 Worm and worm gear pair 蜗 杆 和 蜗 轮 对
What Is Spur Gears (直齿齿轮)？ >Teeth parallel to the shaft axes >The simplest and most common type of gears vuu >Used to transfer motion between parallel shafts Introduction to Engineering
5 Introduction to Engineering What Is Spur Gears（直齿齿轮）? Teeth parallel to the shaft axes The simplest and most common type of gears Used to transfer motion between parallel shafts