In contrast to HPS, Rack EPS is powered electrically. With these steering gears, the assist torque acts directly on the rack. At thyssenkrupp, we align the servomotor and the control unit parallel to the rack. The torque of our own electric motor is transferred to a ball screw via a toothed belt. The ball screw then moves the steering rack which, in turn, moves the vehicle wheels to the turning angle.
Characteristics:
- Rack forces up to 18 kN (small utility vehicles)
- Speed-dependent steering assistance
- Improved steering feel due to “column torque control”
- Interface for vehicle assistance functions (steering torque and angle)
- Modular design for higher volume
- Good road feedback due to low system friction and low inertia
- Simplified vehicle coordination in comparison with hydraulic systems
- Low stress on the steering train because the assist torque acts directly on the rack
- Low noise emissions because the servo unit is installed in the engine compartment
- No additional space needed in the cockpit
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/lenkgetriebe/hps_image_w997_h749.jpg "HPS")
/lenkgetriebe/rack-eps_image_w997_h749.jpg "Rack EPS")
/lenkgetriebe/dualpinon_image_w997_h749.jpg "Dual pinion EPS")