Torque peak detection and control mechanism for a CVP

A system for preventing over-torque in a transmission comprising:

• a torque sensing device drivingly engaged with a torque source and adapted to transfer torque from the torque source to an input of the transmission and adapted to measure an applied torque, being an amount of torque being transferred to the transmission from the torque source;
• and
• a control mechanism operably engaged to the torque sensing device and adapted to modify a current state of the transmission based on the amount of torque measured by the torque sensing device;
• wherein the transmission comprises a continuously variable transmission (CVT),
• wherein the CVT comprises a continuously variable planetary (CVP) variator and the current state of the transmission controlled by the control mechanism comprises a speed ratio of the CVP variator, and
• wherein the torque sensing device comprises a first rotatable member, a second rotatable member and a torsion spring disposed therebetween,
• wherein the first rotatable member is configured to transfer torque from the torque source through the torsion spring to the second rotatable member,
• wherein the second rotatable member is configured to transfer torque received through the torsion spring to the input of the transmission, and
• wherein the torsion spring produces a phase difference in rotations of the first and the second rotatable members, the phase difference being proportional to the torque applied by the torque source to the transmission and thereby providing a measurement of the torque being applied to the transmission.