In November 2020, crane manufacturer Tadano Demag presented its new AC 450-7 all-terrain crane. Voith is going to supply the wear-free integrated acceleration and braking system (VIAB) for the seven-axle vehicle. The system combines turbo coupling and retarder in one hydrodynamic circuit and thus ensures wear-free starting and braking. This allows highly sensitive maneuvering and starting of the vehicle even with particularly heavy loads and on difficult terrain.
This is made possible by the unique design of the VIAB. The pump impeller and turbine wheel face each other in a non-contact configuration in the Turbo Retarder Clutch. The moving pump impeller is at the engine end, while the turbine wheel is installed at the transmission input. The power is transmitted hydrodynamically. This form of power transmission offers the benefit of fast yet gentle and wear-free transmission at full engine torque. In addition to starting, the Turbo Retarder Clutch also acts as a primary retarder. Even in difficult situations, the full braking power is always available because the service brake doesn’t run hot. This significantly extends the service life of the brake pads.
The first vehicles will be delivered in mid-2021. With a total length of 17.62 m and an outrigger base of 8.45 m, the AC 450-7 is not larger than a six-axle crane, but allows significantly higher lifting capacities. All seven axles steer while four are driven. It is powered by a powerful 460 kW Mercedes-Benz engine that meets the emission requirements of EU Stage V and Tier 4 Final. In combination with the wear-free Turbo Retarder Clutch it ensures maximum performance and dynamics.