The vastly improved operator safety and performance is achieved by the increased level of machine stability and traction. The patented mechanism enables the RRV to continuously self-adjust and distribute the working load across the 4 wheels. The load-bearing axle limits the forces transmitted as work is carried out, for example by a mechanical grab. Extension and rotation of the grab pulls the RRV’s centre of gravity sharply to one side. This increases the risk of the least-loaded rail wheel lifting away from the rail and consequently posing a potential derailment.
The EQ Axle prevents this by bearing the load of the vehicle chassis through two joists, linked to an axle which supports a pair of rail wheels. The ‘floating’ axle is mounted within a cage, which limits the pivot travel during the transfer of load-forces as the RRV works at the line side. Throughout the turning action, at least 20% of the Axle load is retained on the least-loaded rail wheel. When the cage stop position is reached there is 20% margin against RRV tipping. The EQ Axle offers a substantially greater degree of stability than the other stabilising wheel-set designs currently available.
US terms: hi-rail, railroad