Reduction gearset
The reduction gear transfers the power output of the servomotor to the rack. The revolution ratio between the servomotor and steering wheel is approx. 21:1.
The reduction gear consists of a belt drive and a ball screw. The ball screw has a rise of 7 mm per revolution. The servomotor drives the toothed belt. The belt drive has a reduction ratio of 2.85:1. The toothed belt drives the ball screw. The ball screw has an internal ball return (5 rotations). The ball screw is noise-optimized.
| Item | Explanation |
|---|---|
| 1 | Drive shaft of servomotor |
| 2 | Toothed belt |
| 3 | Rack |
| 4 | Bead chain |