Bevel pinion 1 rotates about fixed axis OA. Crown gear (circular rack) 2 rotates about fixed axis OB. Axes OA and OB intersect at point 0. The transmission ratio of the mechanism is i₁₂=ω₁/ω₂=r₂/r₁=z₂/z₁=1/sin(δ₁)=1/cos(δ) where r₁ and r₂ are the radii of contacting circles on the pitch cone of pinion 1 and on crown gear 2, z₁ and z₂ are the numbers of teeth of gears 1 and 2, δ₁ is the pitch cone angle of pinion 1 and δ is the centre angle (angle between axes OA and OB).
$2333$SG,3L$