The double-row Roller slewing Bearing has three seat-rings.The steel balls and the spacers may be directly arranged into the uppeer and lower raceways.Two rows of steel balls with different diameters are fitted accoding to the load.

Such open mode fitting features extraordinary convenience.The load angles of bouth upper and lower races are 90,which enable to bear large axial force and tilting moment.

When the radial force is larger than 1/10 of the axial force, the raceway should be especial desianed.

As the axial and radial dimension of the double-row Roller slewing Bearing are rather large,the bearing construction is strudy,hence it is especially suitbale for tower cranes which requiring working diameter over medium range,mobile cranes and unloading machines.