Cam hard stop for end of life

A selectively engagable dry friction clutch assembly for connecting a transmission with a flywheel of an engine comprising:

• a cover having a main body axially spaced from said flywheel and being torsionally connected thereto;
• an axially movable pressure plate torsionally connected with said cover, said pressure plate on a side opposite said flywheel having an annular groove with an inner radial wall, said pressure plate also having a connected pin;
• a friction disc for having torsional connection with an input shaft of a transmission, said friction disc being axially positioned between said flywheel and said pressure plate;
• a release assembly including a push type diaphragm spring for urging said pressure plate toward said flywheel;
• and
• an adjustment assembly juxtaposed between said pressure plate and said spring for compensating for wear of said friction disc, said adjustment assembly including:
• a multiple ramp first cam ring integral with said pressure plate;
• a multiple ramp second cam ring juxtaposed between said diaphragm spring and said first cam ring wherein rotation of said second cam ring with respect to said first cam ring changes an effective distance between said spring and an extreme end of said pressure plate, said second cam ring having an inner step and an outer radial rim and said second cam ring having a series of radial slots;
• a torsional spring positioned within said pressure plate annular groove connected between said pin in said pressure plate and said second cam ring to urge said second cam ring to rotate with respect to said first cam ring;
• control fingers frictionally connected with said pressure plate in rectangular apertures of said pressure plate, said control fingers having an extreme end for contact with said flywheel and a limiting end for restraining rotation of said second cam ring by contact with said second cam ring outer radial rim in an absence of wear of said friction disc;
• and
• a baffle snap fit connected with said second cam ring for shielding said torsion spring, said baffle having tabs projecting through said second cam ring radial slots for making contact with said control fingers to limit relative rotation of said second cam ring with respect to said first cam ring, and said baffle having a main radial edge for positioning on said second cam ring step with a barb to engage said step, said baffle having an inner radial wall to position adjacent said pressure plate radial inner wall to pilot position said second cam ring and said baffle having a ramped depression to prevent said torsion spring from losing connection with said pressure plate.

An adjustment assembly for a selectively engagable dry friction clutch assembly for connecting a transmission with a flywheel of an engine wherein the clutch assembly includes a cover having a main body axially spaced from the flywheel and being torsionally connected thereto;

• an axially movable pressure plate torsionally connected with said cover;
• a friction disc for having torsional connection with an input shaft of a transmission, said friction disc being axially positioned between said flywheel and said pressure plate;
• a release assembly including a clamp force member;
• said adjustment assembly comprising:
• a first cam ring fixed with respect to the pressure plate;
• a second cam ring juxtaposed between a clamp force member and the first cam ring wherein rotation of the second cam ring changes an effective distance between the clamp force member and an extreme end of the pressure plate;
• a torsional spring connected between the first and second cam rings to cause the second cam ring to rotate;
• a control finger for frictional connection in an aperture of said pressure plate, said control finger having an extreme end for contact with said flywheel and a limiting end for restraining rotation of said second cam ring in an absence of wear of said friction disc;
• and
• a baffle connected with said second cam ring for protecting said torsional spring, said baffle having a tab for making contact with said control finger to limit rotation of said second cam ring.