Tyre couplings are divided into two categories: convex and concave, and the convex type is further divided into three types: integral type with skeleton, integral type without skeleton and radial notch type.The inner side of the tyre ring is bonded to the steel skeleton by vulcanisation and a nut is welded to the bolt hole on the skeleton.When assembled with bolts and two halves of the coupling flange connection, f-type tyre coupling, relying on the tightening of the bolt so that the tyre and the flange end surface of the friction generated between the torque transfer, tyre ring torsional shear deformation occurs during the work of the tyre coupling has a high degree of elasticity, compensation for the two axes of the relative displacement of the ability to be larger, and good damping, and the structure of a simple, no lubrication, assembly, dismantling and maintenance are relatively convenient.The disadvantage is that the bearing capacity is not high, large external dimensions, with the increase in the relative torsion angle of the two shafts so that the tyre profile distortion, axial size slightly reduced, will produce a large additional axial force on the two shafts, so that the bearing load increases and reduces the life of the coupling.Tyre coupling high-speed operation, the outer edge of the tyre due to the role of centrifugal force and outward expansion, will further increase the additional axial force.For this reason, when installing the coupling, measures should be taken so that the direction of stress in the tyre is opposite to the direction of stress generated during operation, in order to offset some of the additional axial force, to achieve the coupling and the two bearings of the work and conditions.