Neat and clean working machines

The market for mobile working machines is facing massive challenges. By keeping an eye on the big picture, though, Rexroth systems are helping, even today, to master those tasks.

Manufacturers of mobile working machines are concerned by four major aspects:

♦ energy
♦ the environment
♦ costs
♦ functionality.

Upcoming statutory requirements such as Tier 4 Final and the revised version of the EU Brake Directive are piling on the pressure to make changes. Additionally, customers are demanding higher performance levels, improved operability and lower costs. These are requirements that can only be met if the four challenges mentioned above are treated as an entity. To this end Rexroth offers new components, operating modules and complete system solutions that make mobile working machines more energy-efficient, less expensive and more functional while lowering emission levels.

The diesel engine knows what the hydraulics are up to

The heart of the “Tier 4 Final” challenge is to be found in the drive-train. If, for example, drive systems fail to communicate with each other properly, mobile working machines deliver more power than is actually needed. Diesel Hydraulic Control (DHC) prevents this unnecessary surplus. So now the right hand – the diesel engine – knows what the left hand – the hydraulic system – is doing.

This novel control concept links the traction drive and the operational features with the combustion engine by means of an electronic control unit. So the diesel engine is notified immediately whenever the driver transmits a signal to the operating hydraulics, via the joystick for example. The system as a whole optimizes resource use.

Benefits:
♦ Up to twenty percent less energy consumption
♦ Identical end-of-the pipe output even with less responsive diesel engines and lower engine speeds
♦ Less exhaust pollution
♦ Less noise

There are two other drive-train strategies to satisfy the requirements of “Tier 4 Final”. During Downsizing, large engines are replaced by smaller power plants without any noticeable loss of performance. Ideally, output will be less than 56 kilowatts or about 75 horsepower since the standards for these engines are not quite as stringent.

Electric hybrids for mobile working machines can also contribute towards dramatic diesel fuel savings and emission reductions. Rexroth is able to fall back on the know-how of the entire Bosch Group in this respect. This development is still in its infancy, however; towards the end of 2009 work began on a pilot project to build the first experimental vehicle.
1. The diesel engine knows what the hydraulics are up to
2. Hydraulic power brake system with ABS
3. Diesel engine brake without over-revving
4. Hydraulic valves that utilize the effects of gravitation
5. Fewer hydraulic components, greater ease of operation

Pages: »1 »2 »3 »4 »5