Appendix 11

United Kingdom

Standard torque loss values – geared angle drive

Consistent with the standard torque loss values for the combination of a transmission with a geared angle drive in Appendix 8, the standard torque losses of a geared angle drive without transmission shall be calculated from:

T_{l,ad,in} = T_{add 0} + T_{add 1000} \times \frac{n_{in}}{1000 rpm} + f_{T_add} \times T_{in}

where:

T_l,in

Torque loss related to the input shaft of transmission [Nm]

T_addx

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

(if applicable)

n_in

Speed at the input shaft of transmission [rpm]

f_T

1-η;

efficiency

f_{T_add}

0,04 for angle drive gear

T_in

Torque at the input shaft of transmission [Nm]

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)

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

The standard torque losses obtained by the calculations above may be added to the torque losses of a transmission obtained by Options 1-3 in order to obtain the torque losses for the combination of the specific transmission with an angle drive.