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Drive and Control Systems for Commercial Vehicle Superstructures
Drive Hydraulics for Tippers, Hook Appliances, Dump Trucks and Toll-off Dumpers
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To load and unload commercial vehicles, the vehicles are often equipped with special devices and attachments, such as tipper cylinders. The hydraulic pumps are generally mounted on the side of the vehicle’s gearbox integrated power take-off units (PTOs). The PTOs are engaged and disengaged by means of the truck’s pneumatic system.
Hydrostatic Transmission
Rexroth KFA-type fixed displacement pumps are axial piston pumps based on the proven bent-axis principle. They are available in the nominal sizes 23, 32, 45, 63, 80, 107 and 125 cc/turn, with working pressures up to 350 bar, respectively 300 bar for size 125. KFA pumps are used for open circuits. This range of pumps is characterised by extra-quiet running, particularly robust transmission and minimal dimensions.
One special feature compared to rival pumps is the patented system for easily inverting the direction of rotation from outside, without having to dismantle the pump. The threaded high-pressure flange is simply screwed into the opposite thread. This screw-in pressure flange also adjusts the pump for minimum noise and pressure pulsation of the fixed displacement pump.
Sophisticated Hydraulic Systems
Loading and unloading systems are designed as load-sensing systems with open-center inlet unit. The Rexroth M4-12 valve block permits highly sensitive proportional control of the individual loads. The actuating system can be mechanical, hydraulic or electro-hydraulic. The four shafts and static support are actuated electro-hydraulically by proportional or stepping control. An emergency cut-off valve can also be integrated in the inlet unit. In addition, an internal pilot oil supply is provided.
Finally, for modern actuating systems, a built-in electronic unit for analogue and digital signals (CAN system) is available.
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Relevant links for Commercial Vehicle Superstructures
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