Appendix 8

Calculated fallback values based on the maximum rated torque of the transmission:

• The torque loss T_l,in related to the input shaft of the transmission shall be calculated by

  $$T_{\mathrm{l,in}}=\left(T_{d0}+T_{\mathrm{add}0}\right)+\left(T_{d1000}+T_{\mathrm{add}1000}\right)\times \frac{n_{\mathrm{in}}}{1000\mathrm{rpm}}+\left(f_T+f_{\mathrm{T\_add}}\right)\times T_{\mathrm{in}}$$

  where:

  T_l,in

• Torque loss related to the input shaft [Nm]

T_dx

• Drag torque at x rpm [Nm]

T_addx

• Additional angle drive gear drag torque at x rpm [Nm]

  (if applicable)

n_in

• Speed at the input shaft [rpm]

f_T

• 1-η

η

• efficiency

f_T

• 0,01 for direct gear, 0,04 for indirect gears

f_{T_add}

• 0,04 for angle drive gear (if applicable)

T_in

• Torque at the input shaft [Nm]

• For transmissions with tooth shift clutches (Synchronised Manual Transmissions (SMT), Automated Manual Transmissions or Automatic Mechanically engaged Transmissions (AMT) and Dual Clutch Transmissions (DCT)) the drag torque T_dx is calculated by

  $$T_{\mathrm{dx}}=T_{d0}=T_{d1000}=10\mathrm{Nm}\times \frac{T_{\max \mathrm{in}}}{2000\mathrm{Nm}}=\mathrm{0,005}\times T_{\max \mathrm{in}}$$

  where:

  T_max,in

• Maximum allowed input torque in any forward gear of transmission [Nm]

• max(T_max,in,gear)

T_max,in,gear

• Maximum allowed input torque in gear, where gear = 1, 2, 3,… top gear). For transmissions with hydrodynamic torque converter this input torque shall be the torque at transmission input before torque converter.

• For transmissions with friction shift clutches (> 2 friction clutches) the drag torque T_dx is calculated by

  $$T_{\mathrm{dx}}=T_{d0}=T_{d1000}=30\mathrm{Nm}\times \frac{T_{\max \mathrm{in}}}{2000\mathrm{Nm}}=\mathrm{0,015}\times T_{\max \mathrm{in}}$$

  Here, ‘friction clutch’ is used in the context of a clutch or brake that operates with friction, and is required for sustained torque transfer in at least one gear.

• For transmissions including an angle drive (e.g. bevel gear), the additional angle drive drag torque T_addx shall be included in the calculation of T_dx :

  $$T_{\mathrm{addx}}=T_{\mathrm{add}0}=T_{\mathrm{add}1000}=10\mathrm{Nm}\times \frac{T_{\max \mathrm{in}}}{2000\mathrm{Nm}}=\mathrm{0,005}\times T_{\max \mathrm{in}}$$

  (only if applicable)