Predimensioning calculation
Toothed-belt drive

Before starting up a toothed belt system, an overall preload F₀ must be applied in order to subsequently ensure power transmission without causing tooth skipping ( § 1 and § 1.3). Then, during operation, the occurrence of driving T_r and resisting T_n torques produces tension differences in the belt's straight strands (figure 1), respectively F₁ in the taut strand and F₂ in the slack strand. The difference F₁ – F₂, denoted F_u, depends directly on the torque transmitted: