Selection and Calculation for Slewing Bearing

A1、Single-row four point contact type

A1.1、   Select type according to static loading , the selection and calculation is made according to their loading angle of 60°and 45°respectively.

Ⅰ   （a=60°）     Fa′=（Fa+5.046Fr）* fs            M′=M*fs

Ⅱ   （a=45°）     Fa′=（1.225Fa+2.676Fr）*fs       M′=1.225M*fs

Fa′— Central axial forces acted on the Slewing bearing  ,  10⁴N ；

M′—  Turnover torques acted on the Slewing bearing  ,   10⁴Nm ；

      fs  —  Safety coefficient of the slewing bearing under static working condition  (Table 1)

A1.2、Checkout slewing life according to dynamic loading 

Ⅰ（a=60°）    Fa′=（Fa+5.046Fr）*fd          M′=M*fd

Ⅱ（a=45°）    Fa′=（1.225Fa+2.676Fr）*fd     M′=1.225M*fd

fd —Safety coefficient of the slewing bearing under dynamic working condition  (Table 1)

A2、 Couple-row different diameter ball type

A2.1、Select type according to static loading

Fa′=Fa*fs            M′=M*fs

A2.2、Checkout slewing life according to dynamic loading

Fa′=Fa*fd           M′=M*fd

A3、  Single-row cross arranged roller type

A3.1、 Select type according to static loading

Fa′=（Fa+2.05Fr）*fs          M′=M*fs

A3.2、 Checkout slewing life according to dynamic loading

Fa′=（Fa+2.05Fr）*fd          M′=M*fd

A4、 Triple- row roller type

A4.1、Select type according to static loading

Fa′=Fa*fs                M′=M*fs

A4.2、Checkout slewing life according to dynamic loading

Fa′=Fa*fd                M′=M*fd

A5、Checkout of the bolts’ intensity

When install to the main machine, the pre-tightening of the bolt is determined by the materials’ yield limit times 0.7.

“You could get the graph from our company, or consult the standard JB/T 2300-1999”