Pitching vibration damping for wheeled loaders


Over the past years, the driving speeds of construction vehicles have steadily risen – speeds of over 30 km/h are now often reached when driving on roads.

If a wheeled loader drives over a bump, the resulting shock is transferred from the tire to the chassis, setting the mass of the boom and its attachment in motion. This results in dangerous boom oscillation that can negatively affect the driving comfort and the safety, and therefore the handling performance, of the machine. Due to the constructional design and the weight sharing of a wheeled loader, damping should ideally take place at the cylinders between the boom and the base vehicle to reduce the effect of the introduced pulse so that the resulting pitching motion of the vehicle remains in the controllable area of the driver.

For unsprung mobile working machines, Argo-Hytos offers vibration-damping systems in different designs and feature combinations. All they have in common is the fact that the movement of the bucket or boom is decoupled from the vehicle through hydraulic accumulators. Pipe-rupture protection and constant accumulator pre-charging can be integrated just as accumulator safety valves and drain valves.

The individual functional modules can be combined to a specific control block and easily be integrated into existing hydraulic systems. In most cases, no changes must be made to the existing hydraulic circuits. From simple adding of accumulators over systems with adaptive accumulator pre-charging, up to fully integrated systems with pipe-rupture protection, anti-cavitation, load-dependent damping and accumulator charging, the company can design – together with the customer – a spatially optimized special control block out of individual functional modules that fits into the machine and comprehensively meets the requirements of the customers and the legislature.

As the control block contains all necessary functions, mobile machines can be upgraded or retrofitted quickly and easily. There is no need to readjust the transport position of the bucket or the boom. The loss of carrying height when driving on roads is a thing of the past, because the manifold does not create additional internal leaks. All that is needed to activate the damping, is an electrical signal, generated depending on the speed or the operator.

March 24, 2016

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Tom Stone is Editor of the iVT brand – which includes digital and print editions of a quarterly magazine and the Advanced Lift-truck supplement, as well as ivtinternational.com, which is updated daily. Tom has met and interviewed some of the world's leading industrial vehicle OEM presidents, CEOs and MDs, and takes great pride in cementing iVT's place as the leading forum for debate within the industry, a reputation that his been built up over the brand's 25-year history.

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