Cardan shaft and coupling
There are many structural types of universal couplings, such as: cross shaft type, ball cage type, ball fork type, bump type, ball pin type, ball hinge type, ball hinge plunger type, three pin type, three fork rod type , three-ball pin type, hinged rod type, etc.; the most commonly used is the cross-axis type, followed by the ball cage type. In practical applications, according to the size of the transmitted torque, they are divided into heavy, medium, light and small.