Gearhead/Linear Head: Radial Load Calculation Formula

The radial load can be calculated using the formula shown below.

$$ {W} = \frac{K \times T \times f}{\gamma}$$
W
Radial load [N]
K
Load coefficient by driving method (table below)
T
Load torque at gearhead output shaft [N·m]
f
Service factor
γ
Effective radius of gear or pulleys [m]

Load Coefficient by Driving Method (K)

Drive Method K
Chain and Tooth Belts 1
Gear 1.25
V Belt 1.5
Flat Belt 2.5

Service Factor (f)

Load Type Example Factor f
Uniform Load
  • Uni-directional continuous operation
  • For driving belt conveyors and film rollers that are subject to minimal load fluctuation
 1.0
Slight Impact
  • Frequent starting and stopping
  • Cam drive and inertial body positioning control via stepper motor
 1.5
Medium Impact
  • Frequent instantaneous bi-directional operation, starting and stopping of reversible motors
  • Frequent instantaneous stopping by brake pack of AC motors
  • Frequent instantaneous starting and stopping by brushless motors and servo motors
 2.0

Technical Reference