Ring & Pinion Contact Calculator

Analyze ring and pinion gear contact pattern geometry and load distribution for final drive setup and durability.

Input Parameters

Results

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Pinion Teeth
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Tooth Load
lbs
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Contact Pressure
psi
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Ideal Pattern Length
in
Note: Proper contact pattern should cover 50-70% of tooth face, centered slightly toward the toe under no load. Drive pattern shifts toward heel under load. SAE J2813 hypoid gear standards. Proper setup reduces noise and extends life.

Reference

Pinion Teeth = round(Ring_teeth / Ratio) Pitch Radius ≈ Ring_OD/2 × 0.9 Tooth Load = Input_torque × 12 × Ratio / Pitch_R Contact Pressure = Tooth_load / (Face_width × 0.3) Ideal Pattern = Face_width × 60% (Contact width ~30% of face)