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Product of rough roads

22nd October 1983
Page 22
Page 22, 22nd October 1983 — Product of rough roads
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THE GENERALLY poor state of the country's roads has given Yugoslav manufacturer TAM the incentive to develop a new cab suspension system. The device has now proved itself so well that major European truck builders are said to be investigating the principles for possible adaptation to their chassis.

The new method, claimed to be a world first — a Dunlopdesigned system, also seen on the experimental chassis at last year's Motor Show, uses a different principle — incorporates an "active pneumatic spring" element to provide better cab isolation.

It is already used on the new TAM 11 tonnes chassis. Using two air-bellow spring legs to support the cab, the TAM "active damping" system is supplied with air from the vehicle's air reservoir. By means of a special valve the bellows are filled until the cab is at optimum service level. A second valve is used to top up or vent to the atmosphere while the vehicle is running. Maximum travel of the suspension element is ±50 mm.

Vertical acceleration of the cab in service is considerably less than the acceleration of the chassis. Vertical vibrations are reduced to the extent that a suspension seat is no longer needed for the same degree of ride comfort. An exclusive licensing agreement for manufacture, in Western Europe, has already been made with Carl Freudenberg, of Weinheim, Germany.


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