The load applied to the spline nut varies with the location of the center of gravity of the load, the position of the thrust, inertia generated by acceleration and deceleration during starts and stops, external forces, and torque. When selecting a ball spline, it is necessary to obtain the value of the applied load while taking these conditions into account.

When a Torque Load and a Radial Load are Simultaneously Applied

When a torque load and a radial load are simultaneously applied, calculate the nominal life by obtaining the equivalent radial load using the equation (7) below.

When a Moment Load is Applied to a Single Nut or Two Nuts in Close Contact with Each Other

Obtain the equivalent radial load using the equation (8) below.

Pu Equivalent radial load (N)
(with a moment applied)
K Equivalent Factors (see Table14 , Table15 , Table16 and Table17)
M Applied moment(N・mm)

However, M should be within the range of the static permissible moment.

When a Moment Load and a Radial Load are Simultaneously Applied

Calculated the nominal life from the sum of the radial load and the equivalent radial load.