02 F01 Powertrain

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bearings, optimum spline geometries in the oil circuit and an optimum oil volume in the
differential, it was possible to reduce friction losses and churning losses and to thereby
increase efficiency even further. Together with better heat dissipation, this has con-
tributed to lower oil temperatures.
Driveshafts and Axles Shafts
Driveshaft, F01/02
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F01 Powertrain
Index Explanation Index Explanation
1 Flexible coupling on automatic transmission 4 Universal joint
2 Center connection 5 Flexible coupling on rear axle differential
3 Slide-piece connection 6 Push-fit connection
Driveshaft
For the F01/02 the driveshaft is made from steel and designed meet the higher torque
requirements.
In addition to torque transfer, key aims in the designing of the driveshaft for the F01/ F02
were to satisfy demands for comfort in terms of noise and vibration.
The joints, shaft junctions and shaft diameters were designed in such a way that no
disturbance noise or vibrations at the connecting points are transmitted through the body.
On the F01/F02, the driveshaft is connected to the automatic transmission and rear axle
differential exclusively by flexible couplings. This minimizes high-frequency gear teeth
noise at the rear axle differential.
The connection to the automatic transmission is a screw-fitted one. At the rear axle
differential end, it is push-fitted as it is on the E70. However, this is the first time that a
push-fit connection with flexible coupling has been used. The center connection is a
slide piece connection with universal joint.
The driveshaft absorbs some of the impact energy in the event of a head-on collision.
Improvements have been made to the properties of this crash function, which is integrat-
ed into the forward driveshaft tube. The compression force under which the forward
driveshaft tube is meant to deform has been further reduced with no effect on torque
transfer capability.
Despite increased demands in terms of torque and comfort, it was possible to reduce
weight by comparison with the predecessor model.
Axle Shafts
The F01/F02 has axle shafts that are push-fit at each end, i.e. wheel end and differential
end. The axle shafts for the N63 engine on the F01 are solid.
The journal at the rear axle differential end depends on the size of the rear axle differen-
tial. The journal at the wheel hub end comes in only the one size.
Due to the position of the rear axle differential, the drive shafts on the left and right have a
different overall length.
39
F01 Powertrain [ Pobierz całość w formacie PDF ]

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