It is a rubber part used in mechanical transmission shafting to connect two shafts or shafts with rotating parts. It plays the role of transmitting motion and power, and has the functions of compensating the relative displacement of the two axes and cushioning and shock absorption. It is mainly used to attenuate the torsional vibration of the transmission shaft system, unlike other shock absorption products, while other products mainly attenuate the mechanical linear vibration. According to the force, the rubber elastic coupling is divided according to the structural use. The former has rubber sleeve pin couplings, rubber plate couplings, plum blossom elastic couplings, universal elastic couplings and air spring couplings. ; The latter has rubber-metal ring couplings, tire couplings and U-shaped rubber couplings. Such products have small modulus, large elastic deformation, can withstand loads in different directions, and have small damping. They are widely used in vehicles, ships and various machinery. Excellent vibration and shock absorption and reduced mechanical noise. The rubber portion of the elastomer consists of polygonal rubber with aluminum filling its vertices, each firmly vulcanized and bonded together. The rubber body is respectively connected with the cylinder liner and the flange bushing by bolts, and the transmission is carried out through the rubber body. In particular, the radial bolt connection is the connection between the pre-deformed rubber body and the cylinder liner, so it is a pre-compressed structure with excellent flexibility and can transmit vibration and shock well.