PI 040-13 Lohr am Main, 2013-05-06

Easy to integrate: Autarkic axes from Rexroth

autarkic aves

Autarkic electrohydraulic servo-axis

Hydraulics without power unit and piping

With the drive concept “autarkic axis” Rexroth works on new machine concepts in close development partnerships with customers. Rexroth offers designers the advantages of hydraulic linear movements without the previously required investment into hydraulic power units and the associated pipework. The concept was realized in the form of a ready-to-install module with integrated, completely closed fluid circuit, a control block with digital valves and a hydraulic cylinder. The module is powered by a variable-speed pump drive of the Sytronix family. The autarkic axis merely requires electric power and communicates with the higher-level control over a multi-Ethernet interface. When the motor is switched off, the extremely energy-efficient and consequently digitally constructed axis continues to operate without any noise until the stored excess energy is used up.

Designers appreciate hydraulically powered linear movements, because they can utilize this concept to generate great forces within a minimum of installation space. Above all, they need no mechanical transmission elements. Hydraulic drives operate largely wear-free and are maintenance-free. However, in the past machine builders had to provide a hydraulic power unit and allow for the cost of piping. This is not the case with the autarkic axis.

In the new concept, the fluid circuit is completely integrated into the plug-&-run module. For this reason, it is possible to do without external power units and pipework. This reduces the number of necessary components and lowers the entire installation effort to that required for an electromechanical axis. Consequently, no specific knowledge of hydraulics is necessary for installation and commissioning.

The autarkic axis generates compressive and tensile forces alike of up to 6,200 kN. Designers can realize a wide variety of process tasks with sensitive pressure and position control and achieve accuracies of up to +/- 1 µm with high dynamics.

The consequently digital solution, from activation and control, the variable-speed pump drive, the integrated valve control through to the switchable cylinder with rapid speed and force function opens up new possibilities without the need for forgoing the advantages of hydraulics. Moreover, the linear movement is performed highly precise, with great forces and high dynamics, and is, at the same time, extremely energy-efficient and silent – and the axis continues to run when the motor is switched off. Under full load, the system needs not to be supplied with external drive power and no motor noise is generated. This is accomplished with the control function of digital hydraulics until the stored hydraulic, or optionally electric, excess energy is used up.

The autarkic axis must merely be connected to the electric power supply like a normal electric drive. The person in charge of commissioning sets the parameters as usual over the multi-Ethernet interface of the intelligent drive controller. When parameterizing the axis, he can realize safety functions up to Performance Level “e” to DIN ISO 13849 or SIL 3 to DIN ISO 61508.

The autarkic axes can therefore be flexibly adapted and optimized to the drive task at hand. Rexroth offers a linear drive with great performance that sets new standards with regard to ease of machine integration, condition monitoring, process data exchange, and flexibility. The modules are, however, no future products, but solutions that can today be assembled with some application-specific engineering effort from catalog goods and are available with project-related approvals.

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 in 2012.

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The Bosch Group is a leading global supplier of technology and services. In fiscal 2012, its roughly 306,000 associates generated sales of 52.5 billion euros. 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 4.8 billion euros 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.”

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