CHAPTER 28

Worm and Worm Wheel Set

Chapter Objectives

  1. Provide the specifications of any worm wheel set.

  2. Determine the lead angle of worm.

  3. Calculate the centre distance between worm and gear shafts axes.

  4. Calculate the preferred values of parameters Z1/Z2/q/m.

  5. Calculate the normal pressure angle and axial pressure angle.

  6. Specify the dimensions of worm and gear after knowing the parameters.

  7. Determine the three components of forces on worm and gear.

  8. Determine the relationship between tangential, radial and axial components of forces on worm and wheel.

  9. Determine the efficiency of drive.

  10. Determine the module of gear-wheel tooth from beam strength and wear strength.

28-1 INTRODUCTION

Worm and worm wheel drive are used for non-parallel, non-intersecting ...

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