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LOAD-SENSED AIR SUSPENSION
Page 58
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A NOVEL use for load-sensing valves, normally fitted to adjust brake effort according to the load being carried by an axle, has been incorporated on tandem-steer six-wheelers for the Regent Oil Co. Ltd. by the Primrose Third Axle Co. Ltd.
The six-wheelers have a second steering axle fitted by Primrose next to the driving axle. This added axle is suspended on Dunlop air springs, the pressure in which is controlled by a Clayton Dewandre loadsensing valve linked to the driving axle.
By this means, bogie suspension characteristics similar to those of an ordinary mechanically coupled system are obtained in a surprisingly simple way. The load-sensing valve ensures that the load borne by the second steering axle of the Rear-a-Steer conversion is always proportional to the load on the driving axle.
Moreover, there is an automatic protection against rear-axle overload because the Rear-a-Steer axle's air springs progressively lend their assistance as more weight is imposed on the driving axle.
Another load-sending valve controls the braking effort on the Rear-a-Steer axle in the now-accepted way.