The universal coupling the common feature of large angle to compensate for the amount of the two axes of the different structure type universal coupling angle is not the same as generally ≤ 5 ° -45 °. To achieve universal coupling with its institutional characteristics of the two axes is not in the same axis, there axis angle join two axis continuous rotation, and reliable transmission of torque and motion. Universal coupling is characterized by a large angle to compensate for capacity, compact structure, high transmission efficiency.