Transmission - BMW I01 Product Information

I01￿High-voltage￿Components
3.￿Electric￿Motor
3.2.2.￿Transmission
The￿transmission￿of￿the￿I01￿was￿developed￿by￿the￿BMW Group￿and￿its￿being￿produced￿in￿the￿BMW
plant￿in￿Dingolfing.
The￿transmission￿has￿an￿overall￿ratio￿of￿9.7:1.￿The￿engine￿speed￿at￿the￿transmission￿input￿is￿9.7
times￿greater￿than￿at￿the￿transmission￿output.￿This￿ratio￿is￿realized￿using￿two￿spur￿gear￿units.￿In
addition￿to￿the￿input￿shaft,￿there￿is￿also￿an￿intermediate￿shaft￿in￿the￿transmission.￿The￿spur￿gear￿unit
at￿the￿transmission￿output￿is￿fixed￿to￿the￿differential￿cage￿and￿drives￿the￿differential.￿The￿differential
distributes￿the￿torque￿to￿two￿outputs￿and￿enables￿the￿engine￿speed￿adjustment￿between￿the￿two
outputs.￿The￿differential￿has￿an￿almost￿identical￿design￿to￿that￿of￿a￿front￿axle￿differential,￿as￿used
in￿BMW￿vehicles￿with￿a￿four-wheel￿drive￿(front￿axle￿differential 156).￿For￿use￿in￿the￿I01￿only￿surface
hardening￿measures￿and￿a￿high-strength￿material￿are￿used.
Structure￿of￿the￿transmission
Index
A
B
1
2
3
4
5
6
32
Explanation
View￿from￿rear￿left
View￿from￿rear￿right
Geared￿shaft￿as￿connection￿for￿the￿drive￿shaft￿of￿the￿electrical￿machine
Transmission￿input￿shaft
Spur￿gear￿unit￿1￿at￿input￿shaft
Spur￿gear￿unit￿2￿at￿intermediate￿shaft
Spur￿gear￿unit￿4￿at￿transmission￿output
Differential