Axial Piston Variable Pump A1VO: Three sizes for tailor-made energy efficiency

High power density for compact installation spaces

Manufacturers are relying more and more on high-performance and energy-efficient axial piston variable pumps for fork lift trucks in the power class of up to three tons load capacity. They reduce the diesel consumption in similar applications by ten to fifteen percent in comparison to the conventional combination of fixed units with external gear pumps. With the third size in the A1VO axial piston pump series – size 28 – Rexroth will offer an even finer gradation for application-oriented, easy to install solutions in these vehicles.

The expanded A1VO portfolio is primarily suitable for lift trucks with a load capacity of up to three tons. The variable pumps supply different functions of the working hydraulics, such as lifting and lowering or the steering. Energy savings of ten to fifteen percent thanks to the proportional valve have already been proven in numerous other applications. For a tractor, for example, this amounts to diesel consumption that is up to 10,000 liters lower over a typical period of use.

The new variant increases the scalability of the A1VO series, which Rexroth already offers in sizes 18 and 35. Despite the cube number of 28 ccm, the new size shares the same compact housing as the already existing size 18. It can therefore be compactly installed in the tightest of installation spaces. The connections, which are optionally positioned laterally or to the rear, are easily accessible and make installation particularly easy.

At a nominal pressure of 250 bar and a maximum pressure of 280 bar, the A1VO size 28 provides a high power density in a compact installation space and achieves an efficiency of nearly 90 percent. The high permissible self-priming speeds further complement this power comparison. Adjusting the cradle decouples the speed of the diesel engine from the pump power and produces the flow, according to the actual need. On the new size 28, the speed in continuous operation and at maximum swivel angle has been set to 3,200 rpm. As a result, the A1VO size 28 covers an even wider performance range.