EN
L 212/264
fT,gear
Official Journal of the European Union
12.8.2022
= Gear dependent torque loss coefficient [-]; determined acc.
to subpoints (b)-(f) below
Tin
= Torque at the input shaft [Nm]
gear
= 1, …, highest gear number [-]
(b) The values of the equation shall be determined for all transmission gears located downstream of the EM output shaft.
(c) Where a differential is included in the IEPC, the values of the equation shall be determined for all transmission gears located downstream of the EM output shaft and upstream of, but excluding the gear mesh with the differential input gear.
The gear mesh with the differential input gear can be an external-external gear mesh (either spur or bevel) or a single planetary gearset.
(d) In the case of wheel hub motors, the values of the equation shall be determined for all transmission gears located downstream of the EM output shaft and upstream of the wheel hub.
(e) The value for fT shall be determined in accordance with paragraph 3.1.1 of Annex VI.
(f) The value for fT shall be 0,007 for a direct gear.
(g) The values for Td0 and Td1000 shall be 0,0075 × Tmax,in for gearboxes with more than 2 friction shift clutches.
(h) The values for Td0 and Td1000 shall be 0,0025 × Tmax,in for all other gearboxes.
(i) Tmax,in shall be the overall maximum value of all individual maximum allowed input torque for each forward gear of the gearbox in [Nm].
(3) IEPC internal component differential The torque loss Tdiff,l,in related to the input of the differential parts of the IEPC shall be calculated in accordance with the following provisions: (a) Tdiff,l,in (Tin) = ηdiff × Tdiff,d0 / idiff + (1- ηdiff) × Tin where: Tdiff,l,in
= Torque loss related to the input of the differential [Nm]
Tdiff,d0
= Drag torque [Nm] determined acc.
to subpoints (e)-(f) below
ηdiff
= Torque dependent efficiency [-]; determined acc.
to subpoints (b)-(d) below
Tin
= Torque at the input of the differential [Nm]
idiff
= differential gear ratio [-]