PI 001-16 Lohr am Main, 2016-01-20

Hydrostatic function modules: Safe, tested and robust

Significantly lower integration costs: complete hydrostatic travel drive solutions with functional safety and innovations that conform to the relevant standards.

Complete modules with functional safety and innovative features increase the overall efficiency of construction machinery

With function modules from Rexroth, vehicle manufacturers achieve considerably lower costs during the integration and application of hydrostatic travel drives. They combine innovative functions with standardized safety features that meet the requirements of the Machinery Directive. In addition, the Rexroth developers have examined all components and their interactions with each other, to further improve the robustness of the function modules.

During the construction and configuration of hydrostatic travel drives, vehicle manufacturers have to comply with the Machinery Directive as soon as they wish to market construction machinery in Europe. Bosch Rexroth significantly reduces this cost for manufacturers, as the company has already carried out risk analyses according to relevant standards for an entire range of function models, and have thereby determined the required Performance Level b and c and the C standards applicable for the application. The standard hardware and software configuration of the function modules fulfills this Performance Level. In addition, developers have determined interactions in the system on the basis of FMEA. The system loads were determined using real measured load collectives in numerous applications and the components were adapted accordingly. The function modules thereby achieve a higher level of reliability and availability in the field.

Hydrostatic travel drives control with standard safety functions is integrated into the DRC travel drive software. Vehicle manufacturers can equip their wheeled loaders or telehandlers with innovative drive solutions with reduced engineering costs. The "2+1" travel drive module thereby ensures a reduction in fuel consumption of up to 20 percent without tractive-effort interruption during operation. The diesel engine with a power output of up to 130 kW drives an axial piston pump, which is connected to a variable motor and a fixed motor. The driving range changes automatically and travel speeds of up to 40 km/h can be achieved. The software integrated into the control unit prevents loss of tractive-effort and thereby noticeably improves comfort for the operator. This function module is suitable for construction and agricultural machinery with an operating weight of 6 to 16 tons and tractive forces of up to 120 kN.

The Shift on Fly function also fulfills the functional safety requirements according to DIN EN ISO 13849 and controls manual and automatic switching. Rexroth has incorporated an optimized switching strategy into the software, which enables safe switching in different driving situations. Short, synchronized switching operations increase comfort. In addition, it ensures additional driving and comfort functions that are adapted to the system. The function module with hydraulic pump, hydraulic motor, control unit with software and a gear enables increased efficiency for the entire drive. Both "2+1" and Shift on Fly cover a wide power variation through different combinations of various pump and motor sizes.

Furthermore, with the Hydraulic Start-Stop HSS, Rexroth supports manufacturers of compact construction machinery and wheeled loaders in the reduction of noise emissions. The function module automatically switches off the diesel engine during standstill phases and automatically starts it again when required using previously saved hydraulic energy. The torque required is therefore immediately available. The solution consists of an axial piston variable pump, a valve block, a compact accumulator and a BODAS control unit with preprogrammed software.

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 33,700 associates generated sales revenue of approximately 5.6 billion euros in 2014.

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The Bosch Group is a leading global supplier of technology and services. It employs roughly 360,000 associates worldwide (as per April 1, 2015). The company generated sales of 49 billion euros in 2014.* Its operations are divided into four business sectors: Mobility Solutions, Industrial Technology, Consumer Goods, and Energy and Building Technology. The Bosch Group comprises Robert Bosch GmbH and its roughly 440 subsidiary and regional companies in some 60 countries. Including its sales and service partners, Bosch is represented in roughly 150 countries. This worldwide development, manufacturing, and sales network is the foundation for further growth. In 2014, Bosch applied for some 4,600 patents worldwide. The Bosch Group’s strategic objective is to create solutions 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.”

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*The sales figure disclosed for 2014 does not include the former joint ventures BSH Bosch und Siemens Hausgeräte GmbH (now BSH Hausgeräte GmbH) and ZF Lenksysteme GmbH (now Robert Bosch Automotive Steering GmbH), which have since been taken over completely.


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Susanne Herzlieb
Maria-Theresien-Straße 23
97816 Lohr am Main
Phone: +49 9352 18-1573

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