Both disc brakes and drum brakes are widely used on overhead and gantry cranes, and “better” depends on the duty profile and environment. Travões de disco generally offer superior heat dissipation and more consistent torque at higher speeds, which makes them attractive for high-duty hoisting, frequent stops, and applications where stable braking performance is critical. They can also be easier to inspect and maintain in some layouts.
Travões de tambor (including electro-hydraulic block brakes) are extremely common in crane travel and hoist systems because they are rugged, proven, cost-effective, and tolerant of harsh industrial conditions. They often integrate well with electro-hydraulic thrusters and standard crane architectures.
A seleção deve ser orientada pelo torque necessário, energia de paragem, ciclo de trabalho (paragens/hora), velocidade do eixo, restrições de espaço e exposição a poeira, humidade ou corrosão. O melhor freio para grua é aquele corretamente dimensionado para tanto o torque quanto a carga térmica.