... special bearing and screw down worm gear with secondary enveloping surface.StructureIt is composed of main motor, gear reducer, double ... helical spur gear, universally-jointed axle, support, working seat, power screw down gear, ... bearingSize of backing rollΦ450x450 FCD bearingMain motorZ4Motor for screw down gearYZ211KwRolling speed100m/min for special steel and ...