Spur and Helical Gear Design Fundamentals

Table of Contents

1. Gear Design Inputs
   1. Shaft Orientation
      1. Inline Orientation
      2. Parallel Orientation
      3. Right Angle Orientation
   2. Target Safety Factor
   3. Target Design Life
   4. Gearbox Requirements
      1. Size Limits
         1. Envelope Size
         2. Weight
         3. Center Distance
      2. Applied Loads
         1. Speed
         2. Torque
         3. Power
            1. Internal Combustion Engine
            2. Electric Motor
            3. Gas Turbine
      3. Gear Ratio
2. Primary Design Variables
   1. Basic Design Variables
      1. Normal Diametral Pitch and Normal Module
      2. Normal Pressure Angle
      3. Normal Base Pitch
      4. Helix Angle
      5. Face Width
      6. Number of Teeth
   2. Transverse and Calculated Variables
      1. Transverse Variables
      2. Calculated Safety Factors
         1. Tooth Flank Contact Stress
         2. Tooth Root Bending Stress
3. Secondary Design Variables
   1. Material and Heat Treatment
   2. Accuracy Level
   3. Profile Shift
   4. Design for Manufacturability
4. Case Studies
   1. Case Study 1
      1. Step 1: Identify Design Inputs
      2. Step 2: First Iteration
         1. Select Basic Design Variables
         2. Select Secondary Design Variables
         3. Calculate Rating
      3. Step 3: Second Iteration
         1. Modify Design Variables
         2. Calculate Rating
      4. Step 4: Optimize Rating
         1. Modify Design Variables
         2. Calculate Rating
      5. Step 5: Deliverables
   2. Case Study 2
      1. Step 1: Identify Design Inputs
      2. Step 2: First Iteration
         1. Select Basic Design Variables
         2. Select Secondary Design Variables
         3. Calculate Rating
      3. Step 3: Second Iteration
         1. Modify Design Variables
         2. Calculate Rating
      4. Step 4: Optimize Rating
      5. Step 5: Deliverables
5. Case Studies Exercise