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AIR SPRINGS FOR HEAVY VEHICLES NAEANS of preventing roll 'when
Page 112
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/VI cornering are shown in patent No. 857,039. The scheme is illustrated as it would be applied to a twin-wheeled heavy driving axle. (Daimler-Benz A.G., c26 Stuttgart-Untertiirkheim, Germany.) In addition to the main springs, which are in the form of bellows, there are separate compensating pneumatic cylinders which act as dampers during straight running.
The drawing shows the control valve which is operated by the centrifugal force arising from cornering. A pipe (I) from a pneumatic cylinder is connected to each end. When running straight a vacuum is created in the pipe and air is drawn in through the atmospheric port (2).
When cornering, say to the left, a free pendulum (3) swings to the right, opening a disc valve (4) and closing the escape valve (5). Further movement uncovers a compressed-air port (6) which inflates the compensating pneumatic cylinder on the left-hand side to pull that side Of the body downwards.
It is claimed that this method is better than hardening the springs on the outside, because it lowers the centre of gravity and renders the body more stable.