Air power is new steering medium
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AN ALTERNATIVE to hydraulic power steering has been introduced by RFF Engineering (International) Co of Yeadon, Leeds.
The Autosteer uses compressed air for its operation and is suitable for commercial vehicles and buses.
A specially developed rotary control valve is integral with the replacement steering-wheel and is built into the steering-wheel boss.
Conversion from rotary movement of the steering-wheel to linear movement of the control valve is by means of a central helical gear-shaft which is engaged with a matching nut or actuator.
When assistance is not required, the valve components are free to rotate within needle roller bearings to give normal manual steering without hydraulic drag.
If power assistance is needed, the valve can modulate the air flow to the separately mounted aluminium power ram. This, say the makers, allows an exceptionally smooth steering "feel" to be achieved. A ram is used for assistance.
The Autosteer has its own air receiver and, say its makers, it gives the same assistance at low speeds—unlike hydraulic systems. However, energy is not used when power assistance is not required.
According to RFF, the system weighs up to two thirds less than conventional systems and it can be fitted in less than a day.
Distributorships have been set up in both UK and overseas.