097-11 Lohr, 2011-09-21

New Rexroth pump can save 10,000 liters of diesel


Specifically tailored to market needs: The A1VO variable displacement pump from Rexroth enables the economical use of energy-saving load-sensing systems even in smaller tractors.

Variable displacement pump makes economical load-sensing systems for tractors in the lower power range possible

The A1VO axial piston variable displacement pump designed by Rexroth especially for the segment of small tractors reduces diesel fuel consumption by around 10,000 liters over the entire useful life of 6,000 operating hours. The new variable displacement pump reduces the cost differential compared with constant displacement pumps so greatly that it enables for the first time an economical switch from the traditional open-center design to a load-sensing system. This approach summons hydraulic power as it is needed. Simulations based on a 90 hp diesel engine actually used in the marketplace verify fuel savings of between ten and 15 percent per operating hour in mixed usage.

In larger tractors load-sensing systems as a consumption- and thereby emissions-reducing technology have already proven themselves. But for the very price-sensitive segment of small tractors this technology has until now been unaffordable. Rexroth has therefore tailored the design of the new A1VO variable displacement pump to the needs of this market segment – for example by relocating all the connections to the port plate and significantly reducing the number of different models. This simplifies manufacturing, which helps the small-tractor segment achieve a commensurate price/performance ratio.

To make the switch easier for tractor manufacturers, the A1VO has similar dimensions and performance data to the otherwise generally used constant displacement pumps. With a suction volume of 35 cm3 it is designed for speeds up to 3,000 rpm. The variable displacement pump achieves a working pressure of 250 bar and a peak pressure of up to 315 bar and moves up to 105 l/min. The efficiency is nearly 90 percent. Service life is comparable to the A10VO and A10VNO version used on the large tractors.

In comprehensive simulations using OEM engine map data of a commercially available 90-hp-diesel Rexroth calculated consumption savings of between ten and 15.9 percent per operating hour. The results also took into account varying load cycles: from pure travel mode with zero hydraulic output to partial-load operation and full-load operation of the working hydraulics. The new pump achieved the greatest savings in diesel fuel consumption in partial-load operation such as holding the plow during transport or working with the front loader. Projected on to the usual life expectancy of 6,000 hours and assuming a typical load cycle distribution, an overall savings of around 10,000 liters of diesel fuel can be expected.

Rexroth at Agritechnica 2011: Hall 09 – Stand E17

Bosch Rexroth AG is one of the world’s leading specialists in the field of drive and control technologies. Under the Rexroth brand name, the company supplies more than 500,000 customers with tailored solutions for driving, controlling, and moving. Bosch Rexroth is a partner for Mobile Applications, Machinery Applications and Engineering, Factory Automation and Renewable Energies. The company provides customized solutions tailored to the needs and specifications of each individual market. As The Drive & Control Company, Bosch Rexroth develops, produces, and sells components and systems in over 80 countries. As part of the Bosch Group, Bosch Rexroth and its 34,900 associates generated approximately 5.1 billion euros in revenue in 2010.

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The Bosch Group is a leading global supplier of technology and services. In the areas of automotive and industrial technology, consumer goods, and building technology, some 285,000 associates generated sales of 47.3 billion euros in fiscal 2010. The Bosch Group comprises Robert Bosch GmbH and its more than 350 subsidiaries and regional companies in over 60 countries. If its sales and service partners are included, then Bosch is represented in roughly 150 countries. This worldwide development, manufacturing, and sales network is the foundation for further growth. Bosch spent 3.8 billion euros for research and development in 2010, and applied for over 3,800 patents worldwide. With all its products and services, Bosch enhances the quality of life by providing solutions which are both innovative and beneficial.

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