BMW I01, Информация о продукте

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I01�High-voltage�Components
3.�Electric�Motor
34
An�axle�transmission�oil�known�from�conventionally�driven�BMW�vehicles�is�used�as�transmission
oil�(manufacturer�designation,�e.g.�Castrol�BOT-448).�The�transmission�housing�is�also�used�as�an
oil�sump�and�holds�the�full�capacity�of�0.5 l�transmission�oil.�The�spur�gear�units�and�the�differential
run�in�the�transmission�oil�and�ensure�the�entire�transmission�is�lubricated�(oil�sump�lubrication).�The
transmission�oil�is�designed�for�the�operating�life�of�the�I01�meaning�there�is�no�need�for�a�replacement
of�the�transmission�oil.�Nevertheless,�there�is�an�oil�drain�plug,�as�well�as�an�oil�filler�plug,�with�which
the�oil�level�can�also�be�checked.�These�are�shown�in�a�graphic�in�the�chapter�"Mechanical�interfaces".
The�transmission�is�not�integrated�in�the�cooling�system�of�the�electric�motor�and�therefore�has�no
connections�for�coolant�lines.�The�heat�in�the�transmission�which�arises�during�operation�is�low.
Sufficient�heat�is�discharged�via�the�air�flowing�by�at�the�transmission�housing�and�the�connection
for�the�electrical�machine.�The�temperature�in�the�transmission�remains�in�a�range�up�to�a�maximum
120 °C,�for�which�the�components�and�the�transmission�oil�are�designed.�The�transmission�can,
however,�also�absorb�significantly�lower�temperatures:�When�driving�off�after�a�long�immobilization
period�the�components�have�the�ambient�temperature.�As�a�result�of�the�large�temperature�range
excess�pressure�or�a�vacuum�would�occur�in�a�completely�tight�housing.�To�avoid�this�there�is�a
bleeding�hole�above�at�the�transmission�housing.�It�has�a�cap�to�protect�against�dirt�contamination.
The�bleeding�hole�is�also�shown�in�a�graphic�in�the�chapter�"Mechanical�interfaces".
3.2.3.�Mechanical�interfaces
Mounting�and�torque�support
The�mounting�and�support�of�the�drive�torque�is�not�only�related�to�the�transmission,�but�also�the
entire�drive�unit�comprising�the�electrical�machine,�transmission�and�electrical�machine�electronics.
The�weight�force�and�drive�torque�are�transmitted�to�the�rear�axle�module�via�engine�support�arm�and
anti-roll�bar�link�and�from�there�to�the�body.
Components�of�the�transmission�visible�from�the�outside