Tongli thoroughly study the basic theory of slewing ring, revealing seven parameters which affect the loading capacity of the ball type slewing ring, including raceway surface hardness, hardening depth, matrix hardness, clearance, clearance difference between upper raceway and lower raceway, curvature ratio and contact angle. The scientific technical index and reliable technological  processing double the loading capacity of the slewing ring. Rated static capacity per kg ≥ 20kN, raised by 1-2 times.

  1、Raceway Surface Hardness

       The load capacity is positively correlated with surface hardness of the raceway.

   2、Raceway Hardening Depth

      The raceway hardening depth shall match diameter of the rolling element. A mismatch of small hardening depth with big ball diameter may reduce the load capacity. 

   3、Forging Hardness

      The required raceway hardening depth is negatively correlated with the forging hardness.

  4、Curvature Ratio

      The load capacity is negatively correlated with the curvature ratio, i.e. the ratio of the raceway radius to that of the steel ball.

   5、Clearance

      The load capacity is negatively correlated with the clearance.

   6、Clearance Difference between Two Raceways of Double-Row Ball Slewing Ring

    The load capacity is negatively correlated with the clearance difference between two raceways in  double-row ball structure.

   7、Contact Angle

     The actual contact angle is positively correlated with the clearance, while a small curvature ratio shall contribute to a large contact angle.