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| Moving Wheel Loaders Ahead - Drive and Control Systems from Rexroth |
| Working Hydraulics – The Ups and Downs of a Wheel Loader |
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| The challenges for working hydraulics range from basic functions to, in the case of top-of-the-range models, complex requirements and supplementary features. Rexroth can meet all these challenges. No matter which wheel loader size, no matter which functional scope.
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For working hydraulics, too, the criteria of breakout, operating cost, work output, safety and ease of operation become ever more important. This means new challenges in the development of new working hydraulics systems. Alongside conventional systems – gear pump with mechanical throttle control – other increasingly user-friendly technologies are developing with many useful additional functions: variable displacement pumps combined with sensitive, load-pressure-independent flow distribution (LUDV technology) from Rexroth enable supply to be matched to demand for several simultaneously actuated work functions. It additionally minimizes energy consumption.
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From small but precise…
The so-called open-center working hydraulics are perfect for the less expensive wheel loaders. It is a tried-and-tested technology for economical, robust solutions. This system is based around gear pumps AZP together with the control block SM12. The advantages of this system are its simple layout, compact design and the ease of adding functions later-on.
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… to the comfort version …
Three central elements make up this user-friendly system: Pump, valves and controls. It’s knowing how these different areas interact with one another that determines the system’s practicality. The A10V0 variable displacement pump offers a large number of different methods for optimizing energy consumption – such as regulation of pressure and flow combined with higher-level power regulation or electro-proportional swivel-angle adjustment. This pump is directly attached to the travel pumps or the diesel engine’s power take-off. The SX and M6 valve systems are the basic units of the high-quality LUDV flow sharing technology for the various different types of wheel loaders. In addition to load-pressure independent regulation of the flow rate, which enables more than one simultaneous working function to be supplied according to demand, these two systems also offer a number of other advantages: The zero-leak seat valves prevent the bucket from lowering in an uncontrolled manner, while the integrated priority control for the steering reduces the amount of pipework. A special design prevents cavitation when lowering and tipping out the bucket.
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…everything under control
The hydraulic and electronic joysticks THF and MHVEJ with the ergonomic EC 2000+ and EC 4000 handles make everyday use of the loader easier and more effective: Low actuation forces and proportional control behavior permit sensitive control, while various characteristic curves ensure optimal matching to the working hydraulics. Lock-in positions and reference positions for identifying working points simplify the task of the operator. The handles offer a wide selection of switches, rollers, rockers and buttons. For control blocks with no integrated control oil supply there is the compact control oil supply unit MHSTE for serving up to three independent high-pressure circuits. This offers integral pressure limitation valves and shuttle valves as well as various safety functions.
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Find out more at
www.boschrexroth.com/control-blocks and www.boschrexroth.com/joysticks
Relevant links for Wheel Loaders
Back to Drive and Control Systems for Wheel Loaders Home Page
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