xxx 2012-12-05

New Variable Motor Rexroth A6VM

New Variable Motor Rexroth A6VM

Improved low running-speed operation by combining higher nominal pressure, increased specific displacement, and faster rotational speed: New series 71 of the Rexroth axial piston variable motor A6VM.

The new series 71 of the axial piston variable motor Rexroth A6VM features a higher nominal pressure and power density improved by up to a third. The new motor and the newly developed series 40 of the axial piston variable pump A4VG in closed-circuit operation form an ideal combination for hydrostatic travel drives in mobile equipment.

Rexroth developers achieved the higher power density of the new motor A6VM by increasing nominal pressure, rotational speed and specific displacement. The efficiency of the new nine-piston motor is noticeably improved, particularly with small swivel angles. The motor ensures even smoother low running-speed operation at very low output speeds over the entire swivel angle range. The starting behavior of the motor is also improved. The ability of the motor to switch to zero position of the motor also allows state of the art drive functions, such as Rexroth traction control (ASC), to be added.

The sealing points of the threaded connections for the new variable motor series were designed for the use of seal rings. The Rexroth designers also optimized the cross-flow scavenging, which is important above all when using the A6-motor as a high-performance drive. The improved temperature behavior and reduced case pressure cut down on wear and increase service life. Despite the improved performance, the main dimensions of the case are the same as the predecessor series. Speed and temperature sensors can also be connected.

The new performance is best seen in pavers and crawler-type machines such as loading tractors and bulldozers. It improves the driving and steering behavior with regard to precision and power-usage for applications with high feed requirements. Furthermore, these advantages also apply to winch drives and similar applications.

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 38,400 associates generated approximately 6.4 billion euros ($8.9 billion) in revenue in 2011.

To learn more, please visit .

In the U.S., Canada and Mexico, the Bosch Group manufactures and markets automotive original equipment and aftermarket products, industrial drives and control technology, power tools, security and communication systems, packaging technology, thermotechnology, household appliances, solar energy, healthcare telemedicine and software innovations. Having established a regional presence in 1906, Bosch employs over 22,500 associates in more than 100 locations, with sales of $9.8 billion in fiscal year 2011, per preliminary figures. For more information, visit

The Bosch Group is a leading global supplier of technology and services. According to preliminary figures, more than 300,000 associates generated sales of 51.4 billion euros ($71.5 billion) in the areas of automotive and industrial technology, consumer goods, and building technology in fiscal year 2011. The Bosch Group comprises Robert Bosch GmbH and its more than 350 subsidiaries and regional companies in some 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 more than 4 billion euros ($5.5 billion) for research and development in 2011, and applied for over 4,100 patents worldwide. With all its products and services, Bosch enhances the quality of life by providing solutions which are both innovative and beneficial. Further information is available online at and .


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