A worm rigid with an input shaft bites into the surface of a tapering elastomeric body (e.g. of neoprene), with straight or arcuate generatrices, connected to an output shaft. The worm is journaled in a carriage which is displaceable, manually or automatically, along a generatrix of the tapering body to vary the step-down radio between the two shafts.
A variable ratio transmission that varies output drive shaft speed by varying the position of the output shaft drive disk along a conical shaped input drive surface.
A variable ratio transmission has a rotating drive cone with a gear at its narrowest diameter end to provide a non-slip high torque drive in low gear. A worm gear and drive shaft smoothly move an output drive disk back and forth along the drive cone to provide a smooth infinitely adjustable gear ratio to the output drive shaft. A slip clutch and forward, neutral, reverse transmission make the system suitable for motor vehicles especially trucks.
