1
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Slave Cylinder - Clutch
The aluminium transmission housing features reinforcement ribs for additional strength. Liquid sealer is used between the two halves of the transmission (WSS - M2G348-A5) and the end cover (WSE - M4G323 - A4). On transmissions using liquid sealer the end cover is painted black.
In addition to this, components in the transmission have been modified although their design has not been changed.
The iB5 manual transmission is a "2 shaft transmission". The clutch is operated hydraulically.
On a "2 shaft transmission" all gearwheels are constantly in mesh. Each gear ratio is achieved through one pair of gearwheels.
The direction of rotation of the output shaft is reversed for reverse gear by using an idler gearwheel.
All gearwheels are helically splined, synchronized (except reverse gear) and run on friction bearings.
This reduces noise to a minimum and provides easy gear changing, together with low weight and compactness.
The spring loaded return slide in the external gearshift mechanism is eliminated by fitting a selector lever relay with return spring inside the transmission.
Components of the iB5 Manual Transmission
Overview
2
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Inner synchronizer ring
4
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Outer synchronizer ring
Double synchronization
The first and second gears are double synchronised. Because a second synchronizer ring is used, the effective surface compared with the simple synchronizer is approximately doubled. Ease of gear changing is considerably improved through double synchronization.
The double synchronization components are: inner synchronizer ring, synchronizer cone, outer synchronizer ring and synchronizer hub.
The conical surface on the gearwheel is no longer present. Synchronisation is achieved through the two synchronizer rings and the synchronizer cone which fits on the gearwheel.
Differential
The basic components of the differential are:
- Crown wheel
- Differential housing with two taper roller bearings
- Differential pinions
- Drive halfshaft pinions
The transmission and differential are located inside an aluminium two part housing which is connected to the engine by a flange.
The input shafts are splined.
Driving torque is transferred to the differential cage by the crownwheel which is bolted to it.
Inside the differential housing are the differential pinions which are located on a spindle, and the drive halfshaft pinions which are connected to the front drive halfshafts by splines.
When there is a speed difference between the two front wheels (for instance when driving through a curve), the front drive halfshaft pinions are able to turn on the differential pinions.
Power Flow
Neutral
The reverse gear idler is driven by the input shaft and its purpose is to reverse the direction of rotation of the output shaft when reverse gear is engaged.
The reverse gear idler is carried on a needle roller bearing on the idler shaft, and also on a mounting.
The detent mechanism and the gear selector finger are mounted on a sleeve in the selector mechanism housing, and they use a spring-loaded ball keep the chosen gear engaged until another gear is selected.
The selector lock mechanism has three selector positions.
