Flat disk d is keyed to shaft 1 and rotates about fixed axis A. Rotation is transmitted from disk d through ball 2 to tapered disk e which is keyed to shaft 3 and rotates about fixed axis B. Tapered disk 4 rotates freely on shaft 3 and, by means of spring 8, develops the pressure required to transmit torque in the mechanism. Ball 2, subject to the pressure of concave rollers a and b, forced against the ball by screws 5 and 7, can rotate only about axis C-C. The angle of inclination of axis C-C of rotation of ball 2 can be varied by tilting frame 6 as shown by the arrows. This provides stepless variation of the transmission ratio between shaft 1 and shaft 3. Spring 8 holds disks e, 4 and d in constant contact with ball 2. The transmission ratio from shaft 1 to shaft 3 is i₁₃=ω₁/ω₃=n₁/n₃=(m/l)cos(φ) where ω₁, ω₃, n₂ and n₃ are the angular velocities and speeds (in rpm) of shafts 1 and 3, m and I are the constant distances from points K and L of contact between ball 2 and disks e and d to axes B and A, and φ is the variable angle of tilt of axis C-C.
$3478$CF,IV$