XC90 L5-2.5L Turbo VIN 59 B5254T2 (2004)
The engine cannot drive the starter motor because the pinion turns in the rollers.
The freewheel clutch is attached to the armature shaft by spiral splines, which facilitate engagement and disengagement of the starter motor pinion /
flywheel ring gear.
The left-hand illustration displays the normal position. The starter motor, connected to the outer section drives the pinion (inner section) by means of the
rollers, which then lock.
The right-hand illustration displays what happens when the starter motor remains connected when the engine is started. The pinion (inner section) cannot
drive the starter motor (outer section) because the rollers disengage.
Planetary train
The planetary train is used to reduce the rotation speed of the pinion gear in relation to the speed of the armature and to increase the torque of the pinion.
The planetary train consists of:
1. Pinion shaft with splines
2. Ring gear (fixed section)
3. Planetary gear (connected to the pinion shaft)
4. Sun gear (connected to the rotor)
5. Armature
6. Commutator
