In most cases, drum gear coupling with mandatory grease lubrication. Hot strip mills, rolling torque, by the roll diameter rotary limit, cross shaft universal coupling generally used as the main drive shaft torque transmitted can not meet. The drum gear coupling of the main advantages are: drum gear tooth surface after carburizing treatment, high load capacity; the main failure mode drum gear is worn, the use of forced lubrication after, tooth wear a significant reduction in the amount of wear is grease lubricated about 10%, circulating lubrication oil can take the heat roll end rolling friction generated heat and teeth, effectively preventing the tooth surface to reduce the allowable contact stress; under normal circumstances, broken teeth phenomenon does not appear to meet the requirements of the working characteristics of continuous rolling mill; the drum gear coupling to meet the requirements of the rolling mill rolls channeling, stretching is very convenient; use of safe, clean, efficient and so on.