The elastic element of the plum-shaped elastic coupling is approximately plum-shaped. The coupling has the performance of compensating for the relative offset of the two shafts, damping and buffering, small diameter, simple structure, no lubrication, high bearing capacity and convenient maintenance. Axial movement, suitable for connecting coaxial lines, frequent starting, forward and reverse changes, medium speed, medium torque and other transmission shafts and working parts that require high workability. Not suitable for heavy loads at low speed and limited axial dimensions. It is difficult to align the two shafts after replacing the elastic element. The plum-shaped elastic coupling is processed by machining methods such as turning, milling, and broaching, and then undergoes an overall heat treatment to obtain sufficient strength.

Plum couplings are well balanced and suitable for high speed applications (up to 30,000 rpm), but cannot handle large deviations, especially axial deviations. Larger eccentricities and declinations create larger bearing loads than other servo couplings. Another issue of concern is the failure of the quincunx elastic coupling. Once the plum blossom elastic spacer is damaged or fails, the torque transmission will not be interrupted, and the metal claws of the two bushings mesh together to continue to transmit the torque, which is likely to cause problems in the system. Selecting the appropriate plum blossom elastic spacer material according to the actual application is a major advantage of this coupling. Different hardness and temperature tolerance allow customers to choose the appropriate material to meet the performance standards of the actual application.