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 City Steering

You would have to be able to turn the wheels so strongly. You could use parking spaces that others wouldn't dream of entering. Steering like this makes sense for a compact car. Why don't we already have this on our cars and how does it work?

If the wheelbase is not too large, the manufacturer promises a turning circle of down to seven meters. Instead of a maximum of 45°, a steering angle of up to 75° is possible. Of course, front-wheel drive is then no longer possible because, at least at the moment, there are no drive shafts with such a deflection angle.

Here you can see the implementation on the front axle. It is a further development of the double wishbone. These are retained. However, the tie rods extending from the toothed rack do not directly gip onto the lever for pivoting the wheel, but there is another lever placed between them, which transmits the movement coming from the steering gear approximately 1:1 around the middle position and increases significantly towards the end positions.

Thanks to this variable ratio, the 75° steering angle does not necessarily mean much more steering wheel rotation. But there is one more condition for this steering. Because the rear axle must not just want to move the car forward. As the picture below shows, there are two wheel hub motors at work here, which support the additional steering angle through different drive speeds.

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