1. Concurrent gearing

Primitive surfaces

The primitive surfaces are two cones having the same vertex S and rolling without sliding over each other.

Let: n ₁ , n ₂ number of revolutions per minute of pinions and wheel ;

• z ₁ , z ₂ number of teeth ;

• Σ axis angle ;

• δ ₁ , δ ₂ primitive angles.

$\frac{z_2}{z_1}=\frac{n_1}{n_2}=u$