Progressive Torque differential

The Progressive Torque Differential (PTD) is a torque sensitive "progressive" limited slip differential. It powers both drive wheels, yet permits differential action to compensate for wheel speed differences. The PTD is made up of two side gears and four pinion gears (units with two pinions are also available). A series of unique gear teeth are repeated about the gear face, each defining a different line of action and torque lever position. The unique tooth profiles of the side gear and pinion gear can only mate together in a specific way. This synchronized arrangement of the profiles creates the "progressive" torque biasing operation of the PTD. When traction is needed the pinions begin to rotate. The amount of rotation is the deviation angle, which progressively increases the torque biasing action through the gear set. The torque bias increases until the required bias is delivered up to 3.5:1 bias ratio.