Transmission clutch including locking torsion spring

An adjustment mechanism for a friction clutch for a motor vehicle coupling an engine flywheel to a transmission comprising:

• 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 including a longitudinal axis, the torsion spring disposed in the annular groove, the torsion spring including a cylindrical body that extends to a first end connected to the first cam ring and the torsion spring having a second end connected to the pressure plate, the torsion spring applying a biasing force to the second cam ring promoting rotation of the second cam ring relative to the first cam ring;
• wherein the pressure plate includes a locking slot formed therein partially through the pressure plate and through the opposing surface, the locking slot formed at an angle relative to the opposing surface and the second end of the torsion spring including a locking hook formed thereon, the locking hook extending perpendicular to the longitudinal axis of the torsion spring, the locking hook disposed in the locking slot fixing the locking hook relative to the pressure plate.

An adjustment mechanism for a friction clutch for a motor vehicle coupling an engine flywheel to a transmission comprising:

• 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 including a longitudinal axis, the torsion spring disposed in the annular groove, the torsion spring including a cylindrical body that extends to a first end connected to the first cam ring and the torsion spring having a second end connected to the pressure plate, the torsion spring applying a biasing force to the second cam ring promoting rotation of the second cam ring relative to the first cam ring;
• wherein the pressure plate includes a locking slot formed therein partially through the pressure plate and through the opposing surface, the locking slot formed at an angle relative to the opposing surface and the second end of the torsion spring including a locking hook formed thereon, the locking hook extending perpendicular to the longitudinal axis of the torsion spring, the locking hook disposed in the locking slot fixing the locking hook relative to the pressure plate and wherein the locking slot includes a planar portion that extends from the end of the locking slot to the opposing surface and the locking slot includes an opposing curved portion including a radius that is less than the radius of the locking hook.