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Moving Wheel Loaders Ahead - Drive and Control Systems from Rexroth
Driving – What Gives Wheel Loaders a Kick
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Hydrostatic travel drive or hydrodynamic converter? A question that is often on the lips of the specialists, and Rexroth responds with a clear answer: Hydrostatic drive. The vast number of applications equipped testifies to the superiority of this drive design – also in higher performance classes and speeds.
Advantages of the hydrostatic travel drive:
Few if any switching steps. The large conversion range allows travel to be carried out smoothly and in a controlled manner. Additional advantage: this allows simpler and thus a better cost effected transmission solution.
High performance even at low engine speeds. This delivers powerful tear-out and tractive forces, reduces operating costs and gives a fuel saving of up to 30% as demonstrated in tests by leading manufacturers.
Faster to respond, more maneuverable. Simple, fast, smooth reversing and full torque in both travel directions with no reversing transmission.
Optimum distribution of power between travel drive and working hydraulics. Any power that is not required on one side is made available to the other consumer.
Less switching. Since this machine is easier to operate, it leaves you free to concentrate more on the essentials.
Power exactly where it’s needed. The highly efficient drive provides maximum traction when it is needed – when burying the bucket into a load or moving over heavy ground.
Low heat development in operations involving high tractive force and low speeds.
Installation wherever you wish. With a hydrostatic travel drive you can place the diesel engine anywhere there is sufficient space, since hoses are easier to route than shafts.
Hydrostatic travel drive for wheel loaders up to approximately 60 kW
Price and overall size are the determining factors with compact wheel loaders. Optimum solutions make the best possible use of the available power from the diesel engine. One possibility is the A4VG reversible displacement pump in conjunction with DA control and A6VM variable displacement motors. Together these produce perfect, high torque and high travel speed throughout the large, common control range. The feed pump and necessary valves for the closed circuit are already integrated.
Details can be found at www.boschrexroth.com/axial-piston-pumps
DA control – user-friendly drive and anti stall control even with no electronics
The proven, engine-speed-dependent DA drive control makes driving as easy as having an automatic transmission in an automobile. The DA controller ensures that the pump power is matched perfectly to the available engine power. The continuous, speed-dependent buildup of torque gives the wheel loader pushing force in the pile and allows the bucket to be filled efficiently. The hydro-mechanical pump controller, which operates completely independently, significantly simplifies integration into the vehicle.
Find out more at www.boschrexroth.com/da-control
Hydrostatics and summation gearboxes for wheel loaders above 60 kW
For larger machines we offer in conjunction with leading gearbox manufacturers dual motor packages on switchable or non-switchable summation gearboxes. Rexroth can also supply electronics applications packages comprising robust controllers RC, sensors and turnkey software solutions. This way, an electronic travel drive control DRC can be implemented quickly and inexpensively which readily includes power shift, cruise control and speed limitation.
Hydrostatics and continuous variable transmissions for wheel loaders of all classes
For continuous acceleration there are also, as an alternative to summation gear boxes, continuous variable transmissions with hydraulic motors. We offer custom made hydraulic and electronic solutions that are specially developed and designed by Rexroth project teams in collaboration with experts from the vehicle and transmission manufacturers.
Stabilization module for a comfortable drive
Vibration-free driving thanks to the new-generation Rexroth RSM stabilization module. This reduces pitching independently of the travel drive. The advantages are:
- Faster transport speeds
- Improved handling performance
- Improved driving safety
- Shorter braking distances
- Reduced stress on driver and machine
Relevant links for Wheel Loaders
Back to Drive and Control Systems for Wheel Loaders Home Page
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