The Cardan Shaft Coupling utilizes the characteristics of its mechanism, so that the two shafts are not on the same axis, and the connected two shafts can be continuously rotated under the condition of the included angle between the axes, and the torque and motion can be transmitted smoothly. The biggest feature of the Cardan Shaft Coupling is that its structure has a large angular compensation ability, a compact structure, and a transmission. Different structural types of Cardan Shaft Coupling have different angles between the two axes, generally between 5° and 45°.
 
Cardan Shaft Coupling have various structural types, such as: cross shaft type, ball cage type, ball fork type, convex block type, ball pin type, ball hinge type, ball hinge plunger type, three pin type, trident rod type , three-ball pin type, hinge type, etc.; the most commonly used is the cross shaft type, followed by the ball cage type. In practical applications, according to the torque transmitted, it is divided into heavy, medium, light and small.
 
A mechanical part used to connect two shafts (driving shaft and driven shaft) in different mechanisms to rotate together to transmit torque. In high-speed and heavy-load power transmission, some couplings also have the functions of buffering, damping and improving the dynamic performance of the shafting. The coupling consists of two halves, which are respectively connected with the driving shaft and the driven shaft. Most of the general power machines are connected with the working machine by means of couplings.