GⅡCL type drum-shaped tooth coupling belongs to the rigid coupling, tooth coupling is by the same number of teeth of the inner gear ring and with the outer teeth of the flange half-coupling and other components.The outer teeth are divided into two tooth shapes: straight teeth and drum-shaped teeth. The so-called drum-shaped teeth are made into spherical surfaces with the centre of the spherical surfaces on the gear axis, and the tooth flank clearance is larger than that of a general gear. GⅡCL drum-shaped tooth couplings allow larger angular displacements (relative to straight-tooth couplings), which can improve the contact conditions of the teeth, increase the torque-transferring capacity, and prolong the service life.The contact condition along the tooth width when there is angular displacement.With radial, axial and angular axis deviation compensation ability, has a compact structure, small radius of gyration, large bearing capacity, transmission, low noise and long maintenance cycle and other advantages, especially for low-speed heavy-duty conditions, such as metallurgy, mining, lifting and transport industries, but also for petroleum, chemical industry, general-purpose machinery and other types of machinery, shaft transmission.