Bevel friction wheel 1 rotates about fixed axis A and its external conical surface contacts the external conical surface of bevel friction wheel 2 which rotates about fixed axis B. The transmission ratio between wheels 1 and 2 without slippage is i₁₂=-(n₁/n₂)=-(sin(δ₂)/sin(δ₁)) where n₁ and n₂ are the speeds (in rpm) and δ₁ and δ₂ are the face angles of wheels 1 and 2. The torque M₁ on driving wheel 1 and the torque M₂ transmitted to wheel 2 are related to the required forces Q₁ and Q₂ acting along axes A and B by the equations Q≥(M₁x*sin(δ₁))/(fR₁); Q≥(M₂x*sin(δ₂))/(fR₂) where x=1.5 to 2 is the traction assurance factor, f is the coefficient of sliding friction between the conical surfaces of wheels 1 and 2, and R₁ and R₂ are the mean radii of wheels 1 and 2.
$3363$SmF,3L$