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bber Springing on New Principle

4th September 1959
Page 81
Page 81, 4th September 1959 — bber Springing on New Principle
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EMARKABLE feature of the new Austin 7 and Morris ii-Minor front-wheel-drive cars is that ample accommodation ur adults is provided in a vehicle having an unladen kerb of under 12 cwt. Including luggage, the maximum load carried : vehicle could, therefore, exceed its unladen weight, which :nts a condition that is more nearly comparable to the load if a typical commercial vehicle than is provided by the great ty of private cars.

he variable-rate type, the front and ndependent suspension units are ml to give substantially the same teristics laden and unladen, and the is potentially of more than -tic interest to commercial-vehicle Drs.

:loped by the B.M.C. in conjuncith Moulton Developments. Ltd., aciate company, both systems are an a double-cone element incorporating a spring of highLee natural-rubber compound. The variable-rate characis a function of the rubber being loaded in compression shear, and of the form of cone contour which was aed with the aid of photo-elastic analysis.

hown by the accompanying illustration, the rear suspentits are of the trailing-link type and the spring is located itally in a chassis member. The system gives a mechani,antage of 5 to 1, and this is also a characteristic of the uspension. In this case, vertical cone units are linked Variable -rate. characteristics of the new B.M.C. system result from rubber being loaded in compression and in shear. Mechanical advantage

is 5 to I.

to the inner ends of the upper members of the wishbone system. A high mechanical advantage enables the size and weight of the springs to be reduced to a minimum.

A detailed feature of the car which could he of greater practical interest to 'commercial-vehicle operators than the suspension system is the inclusion of a valve that limits the pressure that can be applied by the Lockheed hydraulic system to the back wheels. Above a predetermined load, additional pressure on the pedal acts on the front brakes only and increases the proportion of the force applied to the front wheels_


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