HJB.30.880 Double-Row Balls Slewing bearings

Double-Row Balls Slewing bearings

CHARACTERISTIC OF STRUCTURE,PERFORMANCE AND APPLICATION

The double-row slewing ring has three seat-ring .the steel balls and spacers may be directly arranged into 

the upper and lower raceways. two rows of steel balls with different diameters are fitted according to the 

load.Such open mode fitting featurextraordinary convence .the load angles of both upper and lower race are 

90, which enable the bearing to bear large axial force the resutant moment. crossed roller bearing, crossed

roller bearings .When the radial force is large than 1/10 of the axial force the raceways should be especially

designed. As the axial and radial dimension of the double-row ball slewing rings are rather large, the bearing 

construction is sturdy,hence it is especially suit able for tower cranes which requiring working diameter over

 medium range, mobile cranes and loading and unloading machines. crossed roller bearing, crossed roller bearings 

  Notes:
  1. n1-number of lurbricating holes, evenly distributed, lubricating nipple M10×1GB1152-1153-79.
  2. Mounting hole n-φ, may be replaced with screw hole, tooth width b may be taken as H-h.
  3. Gear force of periphery given in the table is its maximum value, nominal force of periphery is taken 1/2 of the given value.
  4. The trim top coefficient of outer and inner tooth is 0.1 and 0.2, respectively.
Gear heat treatment forms         
Due to the need of transmission power or torque of slewing bearing, there are usually teeth in a ferrule. The general state of heat treatment of gear is normalizing or tempering. And the tooth surface and tooth root is IF Quenching.

Double-Row Balls Slewing bearings




Double-Row Balls Slewing bearings