PI 043-17 Lohr am Main, 2017-09-06

Efficient hydrostatic travel drives reduce diesel consumption

Compact, high-performance and more energy-efficient: Hydrostatic travel drives from Bosch Rexroth for agricultural and forestry machinery

Bosch Rexroth combines innovative system approaches with more efficient components

Harvesters, field sprayers, combines: New hydrostatic travel drive solutions from Bosch Rexroth reduce diesel consumption compared to existing solutions. In addition, the company has combined more efficient components with new, electronified system approaches and software packages. The ever-increasing electronification of the travel drives also forms the basis for assistance systems that provide relief to the driver and increase the safety of the vehicles.

With the newly developed electronic torque control for hydrostatic travel drives in agricultural and forestry machinery, Bosch Rexroth has decoupled the torque at the drive wheels from the diesel engine speed. The control strategy of the hydrostatic transmission implements the driver's intention, taking into account the limited input power. The diesel engine speed is reduced as much as possible considering the power requirements of the hydrostatics. Bosch Rexroth assigns the hydraulic functions their own layer in the controller. Vehicle manufacturers can therefore adapt the software to other machine sizes with a few parameter changes.

Bosch Rexroth has also analyzed the drive trains of numerous vehicles using big data methods and can thus improve the calculation of roll resistance.

Manufacturers of agricultural and forestry machinery can now integrate assistance systems common in the auto industry thanks to the electronification of the travel drives. For example, the HLB high level brake from Bosch Rexroth uses special control software to achieve maximum hydrostatic deceleration for maximum ease of use and safety. ASR prevents individual wheels from slipping, thereby increasing the level of safety.

Through in the software integrated efficiency maps of the A4VG pump series 35 and the A6V motors, always the best possible operating point of the drive train can be selected, depending on the actual load requirement. In this way, the efficiency of the hydrostatic powertrain will increase further and therefore the fuel consumption of the complete machine will decrease.

At the component level, the axial piston motors A6VM/E series 65 and 71 are re-engineered. Assisted by advanced simulation methods Bosch Rexroth reduces the oil flow resistance in the port and lens plate of the motors. As a result of their overall efficiency improvements. This leads to a reduced fuel consumption for example of the harvesting machine.

The modular HYDROTRAC GFT 8000 gear series combines two and three-stage planetary gearboxes with these axial piston motors to create an individually customizable drive package. The new assembly groups, which come in nine sizes, cover output torques up to 130 kNm in both open and closed circuits with their finely graduated gear ratios. The optional internal multi-disk brake meets high safety standards. It reduces the installation space required and reduces the weight by up to 75 percent in comparison to conventional mechanical brakes. Through the combination of HYDROTRAC GFT 8000 with the latest series of Rexroth fixed and variable motors, machine manufacturers achieve around 10 percent more power in the drive train.

The lower diesel engine speed and the new components from Bosch Rexroth reduce the overall noise emitted from vehicles, without the need for further structural soundproofing measures.

Economical, precise, safe, and energy efficient: drive and control technology from Bosch Rexroth moves machines and systems of any size. The company bundles global application experience in the market segments of Mobile Applications, Machinery Applications and Engineering, and Factory Automation to develop innovative components as well as tailored system solutions and services. Bosch Rexroth offers its customers hydraulics, electric drives and controls, gear technology, and linear motion and assembly technology all from one source. With locations in over 80 countries, more than 29,500 associates generated sales revenue of approximately 5 billion euros in 2016.

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The Bosch Group is a leading global supplier of technology and services. It employs roughly 390,000 associates worldwide (as of December 31, 2016). The company generated sales of 73.1 billion euros in 2016. Its operations are divided into four business sectors: Mobility Solutions, Industrial Technology, Consumer Goods, and Energy and Building Technology. As a leading IoT company, Bosch offers innovative solutions for smart homes, smart cities, connected mobility, and connected manufacturing. It uses its expertise in sensor technology, software, and services, as well as its own IoT cloud, to offer its customers connected, cross-domain solutions from a single source. The Bosch Group’s strategic objective is to deliver innovations for a connected life. Bosch improves quality of life worldwide with products and services that are innovative and spark enthusiasm. In short, Bosch creates technology that is “Invented for life.” The Bosch Group comprises Robert Bosch GmbH and its roughly 440 subsidiaries and regional companies in some 60 countries. Including sales and service partners, Bosch’s global manufacturing and sales network covers nearly every country in the world. The basis for the company’s future growth is its innovative strength. At 120 locations across the globe, Bosch employs some 59,000 associates in research and development.

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Manuela Kessler
Maria-Theresien-Straße 23
97816 Lohr am Main
Phone: +49 9352 18-4145

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