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xxx 2013-10-09

Rexroth’s Improved Variable A6VM Motor

Rexroth’s Improved Variable A6VM Motor

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 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.

About Bosch Rexroth:

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, Factory Automation, and Renewable Energies to develop innovative components as well as tailored system solutions and services. Bosch Rexroth offers its customers hydraulics, electric drives and controls, pneumatics, gear technology, and linear motion and assembly technology all from one source. With locations in over 80 countries, more than 37,500 associates generated sales revenue of approximately 6.5 billion euros ($8.4 billion) in 2012.

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About Bosch:

In the U.S., Canada and Mexico, the Bosch Group manufactures and markets automotive original equipment and aftermarket solutions, industrial drives and control technology, power tools, security and communication systems, packaging technology, thermotechnology, household appliances, solar energy, healthcare telemedicine and software solutions. Having established a regional presence in 1906, Bosch employs nearly 24,600 associates in more than 100 locations, with consolidated sales of $10.6 billion in fiscal year 2012. For more information, visit , and .

The Bosch Group is a leading global supplier of technology and services. In fiscal 2012, its roughly 306,000 associates generated sales of $67.5 billion. Since the beginning of 2013, its operations have been divided into four business sectors: Automotive Technology, Industrial Technology, Consumer Goods, and Energy and Building Technology. The Bosch Group comprises Robert Bosch GmbH and its roughly 360 subsidiaries and regional companies in some 50 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 some $6.1 billion for research and development in 2012, and applied for nearly 4,800 patents worldwide. The Bosch Group’s products and services are designed to fascinate, and to improve the quality of life by providing solutions which are both innovative and beneficial. In this way, the company offers technology worldwide that is “Invented for life.” Additional information is available online at and .


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