Crowned teeth coupling is a new kind flexible coupling which used in the connecting between drum and reducer in exal. tation pants of lifting machine, this kind coupling can transfer torque and load on radial but can not tendrue the transfer of load on axial.

Torque limiter is a kind of protective device. It restrict transfor torque by gliding when required torque exceed rated torque because of machine librating under loading or overloading or machine malfunction. 1t will come back auto when overloading finish. Torque limiter can protect machine from damage. So that it can avoid great expense by not stopping machine.

elastic pin teeth coupling compared with gear coupling, is simple in structure, transfer torque is large, maintenance-free, long service time, without lubrication.

Serpentine spring is used for grid coupling. Grid Coupling is a advanced structural coupling of metal flexible coupling, which depend on two and a half snake spring embedded within the alveolar coupling to transfer torque.