Clutch adjustment system with wear resistant features for back driving prevention

A friction clutch for a motor vehicle coupling an engine flywheel to a transmission comprising:

• an adjustment mechanism compensating for wear of a friction disk coupling the engine flywheel and transmission, the adjustment mechanism including:
• a first cam ring rotatably fixed with respect to a pressure plate, a second cam ring rotatable relative to the first cam ring and both cam rings having a plurality of cam surfaces configured such that rotation of the second cam ring relative to the first cam ring varies a height of the adjustment mechanism, and a torsion spring applying a biasing force to the second cam ring promoting rotation of the second cam ring relative to the first cam ring;
• a back drive prevention assembly including a back drive spring attached to the pressure plate and first cam ring to prevent back drive of the second cam ring through a baffle including a plurality of cam teeth formed on a bottom surface of the baffle;
• wherein the cam teeth are formed at an angle A of from 2.0 to 6.0 degrees relative to a bottom surface of the baffle from a proximal end of the cam teeth to a distal end of the cam teeth decreasing a load applied to the back drive spring and reducing displacement of the back drive spring.