DISC BRAKES FOR TRUCKS: A TECHNICAL INNOVATION FOR HEAVY VEHICLES
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This paper presents some research by Renault, in France, to overcome various problems arising for disc brakes on trucks. The working conditions of disc brakes for long-range trucks are especially difficult in the thermal field. Problems arising from thermal loading include: (1) inadequate lining lifetime; (2) bearing and tyre thermal environment; (3) wide range of working conditions; and (4) need to ensure braking balance between axles. The mechanisms and phenomena, responsible for disc brake performance, are identified by comparing drum and disc thermal working conditions. Research efforts are concentrated in tactical points like: (1) disc material; (2) thermoelastic stresses and strains; and (3) geometrical design. After briefly introducing disc brakes, the paper describes models for surface temperature and a thermal brake. Optimising disc brakes requires the optimisation of performance and thermoelastic behaviour; the possible degrees of freedom here are: (1) disc design; and (2) disc material. For the covering abstract see IRRD 870290.