Double row ball slewing ring bearing is widely used in tower crane for slow-turning under heavy load. As the load situation for harbour crane and shipyard crane is relatively larger, Double row ball slewing ring bearing can provide better load performance.
In tower crane, slewing ring bearing serves as a joint between the upper structure and the undercarriage, providing a means of 360-degree rotation.
Double row ball slewing bearing has three seat ring, the steel ball and the spacing block can be directly arrange into the upper and lower races, two rows of upper and lower steel balls with differently diameter are fitted according to the stress condition.
Double row different ball slewing bearing's axial and radial size are relatively large and solid in structure, so it is specially fpr the medium diameter tower cranes,truck mounted cranes etc.loading and unloading machinery.
2.Good quality and competitive price
3.Trial order accepted
4.ISO certified company
6. Custom-design is available.
7. We can do replacement slewing bearing for differenct type like Rothe Erde,Rollix,INA,SKF,IMO,TG,Kaydon etc.
To get drawing (pdf),please clik on Model.
1. N1 is the numbers of lubricating holes. Oil cup M10×1JB/T7940.1~JB/T7940.
2. The Oil nipple's location can be change according to the user's application.
3. n-φ can change to tapped hole, the diameter of tapped hole is M, and depth is 2M.
4. The tangential tooth force in the form is the max tooth force; the nominal tangential tooth force is 1/2 of the max one.
5. "K" is addendum reduction coefficient.