Gear Types Simulator
Interactive 3D visualization of gear types with selection guide
About this Simulator
Explore the four most common gear types used in mechanical engineering. Each gear type has unique characteristics that make it suitable for specific applications. Use this interactive simulator to understand gear geometry, see how parameters affect tooth shape, and learn when to use each type.
Physics & Formulas
Involute Curve (Tooth Profile):
$$x = r_b(\cos t + t \sin t)$$
$$y = r_b(\sin t - t \cos t)$$
Key Dimensions:
$$r_{pitch} = \frac{Z \cdot m}{2}, \quad r_{base} = r_{pitch} \cdot \cos(\alpha)$$
Where: Z = teeth, m = module, α = pressure angle, t = roll parameter
How to Use
- Select a gear type from the dropdown to view its 3D model
- Adjust teeth count and module to see geometry changes
- Change pressure angle to see steeper or shallower tooth flanks
- Use RPM slider to animate gear rotation and meshing
- Read the info panel below the controls for application guidance
- Drag to rotate view, scroll to zoom in/out
Frequently Asked Questions
What is an involute profile?
The involute is the curve traced by a point on a string unwinding from a circle. This shape ensures smooth, constant-velocity power transmission between meshing gears regardless of center distance variations.
What does module mean?
Module (m) is the ratio of pitch diameter to number of teeth. It determines tooth size - larger module = bigger teeth. Standard modules are 1, 1.5, 2, 2.5, 3, 4, 5 mm. Two gears must have the same module to mesh.
How does pressure angle affect gears?
Pressure angle (typically 14.5°, 20°, or 25°) affects tooth strength and smoothness. Higher angles = stronger teeth but more radial force. 20° is most common for general applications.
When should I use helical vs spur gears?
Use spur gears for low-speed, low-noise applications where efficiency is critical. Use helical gears for high-speed, high-load applications where smooth, quiet operation is important (like automotive transmissions).
What makes worm gears self-locking?
When the helix angle is small enough, friction prevents the worm wheel from driving the worm. This self-locking property is useful for hoists and lifts but reduces efficiency to 40-90%.
