# What’s the Function of Radial Force?

2020-06-12

One of the reasons for the generation and increase of axial force is that the coupling between the primary and secondary gear motor is the barrel-shaped gear coupling which is allowed to have a certain movement value on the axial direction to weaken the small axial force produced by the minor horizontal and axial deviation. Therefore, when the gear motor is running, the shaft sleeve will move along the axial under the action of centrifugal force and small axial force on the connecting shaft. The service coefficient of radial force and axial force .fBF =1 constitutes the basic radial force and axial force provided in the selection table. For radial and axial forces with impact loads and long operating times (more than 8 hours per day), the corresponding service coefficient .fBF >1 should be considered. The permissible radial force FR and axial force FA. will be correspondingly reduced.

### How to Calculate Radial Force?

Gear Motor Radial Force Calculation Formula:

FR1=2000*T1/d1 (N)

FR2=2000*T2/d2 (N)

In the formula, FR1 — radial force N of the input shaft extension; FR2 — radial force N of the output shaft extension; T1 — input torque N.m; T2 — output torque N.m; d1, d2 — pitch diameter (mm) of belt wheel or sprocket wheel.

1. The radial force and axial force borne by the output shaft of the gear motor are enhanced as it adopts the design of the internal supporting bearing, large-size bearing and larger span. This makes it possible to withstand greater radial and axial loads.
2. When the radial force F2r is applied to the shaft center, that is, X=1/2 XL, and when the service life of gear motor with different specifications under different output speeds is 20,000hr*, the permissible radial force F2rB and the permissible axial force F2aB can be calculated by formula F2a1B=0.2xF2rB/F2a2B=0.1xF2rB.
3. When the radial force F2r isn’t applied to the shaft center,if it is closer to the gear motor, that is, X＜1/2xL, the permissible radial force will increase while if it is farther to the gear motor, that is, X＞1/2xL, the permissible radial force will decrease. Find out the load factor Kb according to gear motor rules and the place of application of force, then substitute it into the formula F’2rB=KbxF2rB/axial force: F’2a1B=0.2xF’2rB/F’2a2B=0.1xF’2rB to calculate the radial force.
4. The radial force listed refers to the value acting on the center of the shaft end. When calculating permissible radial force, the radial force from the unfavorable direction and the direction of rotation are usually taken into consideration.
5. When calculating permissible axial forces, the axial force generated from the adverse direction and its direction of rotation are generally assumed. Higher radial and axial forces are also possible. To ensure the accurate calculation, please provide us with detailed information about the actual force and direction of rotation as well as the service life required.