External Gear Units
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Electric Drives Linear Motion and and Controls I Hydraulics I Assembly Technologies I Pneumatics I Service Bosch Group Choose as standard — the right solution for every application. External gear machines from Rexroth

Very efficient conversion of motion and pressure: external gear pumps and motors from Rexroth Two gears make the external gear machines an efficient converters: mechanical energy (torque and rotational speed) is converted into hydraulic energy (flow and pressure) — and vice versa. A simple principle that has countless being improved. Rexroth places particular emphasis on making this energy conversion as efficient as possible and Rexroth external gear machines sets' industry Standards. Another reason for this is Rexroths' high standard of production, resul- ting in unpresidented quality and...

Simple principle — optimum efficiency: external gear machines from Rexroth Rexroth external gear machines essentially consist of a compact driving mechanism with drive gears supported in high-performance sleeve bearings. Housing are available in reinforced aluminum or spherulitic graphite iron. The high level of efficiency achieved by Rexroth external gear machines is due to gap control, (indepen- dent of operating pressure) as well as high production quality of its

External gear machines from Rexroth: a single principle with more than 5000 versions... Thanks to Rexroth's modular system, you now have the choice of more than 5000 different versions of external gear pumps and, as of October 2006 ,more than 500 external gear motors. This range of options is created by combining the required operating parameters (pump output), operating pressure and rotation speed with customer-specific design options such as direction of rotation, type of drive shaft, mounting flange, fluid line connection and end cover. Every year, well over 100 new versions are added to...

5 Products and applications … drives the most diverse products. Standard external gear pump SILENCE pump Rexroth external gear pumps are suitable for use with operating pressures up to 280 bar and can cope with rotational speeds of up to 6000 rpm. A pair of precisely ground gears ensures lower levels of noise and vibration. The result: less noise emission in the entire hydraulic system.

Products and applications Multiple pump combinations Rexroth‘s modular system of constructing external gear pumps makes it possible to have multiple pumps that can be combined in a variety of ways including pumps with valve technology as well as customized single pumps. External gear motor The external gear motor is available as reversible with valve technology and sensor technology options. In addition, Rexroth gear motors are outstanding for their low starting pressure. 6

The principle of quietness — SILENCE pumps With SILENCE pumps, hydraulic sealing is provided alternately by both the front flanks and the rear flanks. Precisely ground driving mechanism drastically reduces flow pulsation. This not only reduces pump noise, it also lowers noise emission from the entire hydraulic system due to reduced vibration excitation. Standard Q Q t t Rexroth SILENCE pump series Volumetric displacement in cm3/rev SILENCE pump series S T U 4–28 20–36 22–63

Quality control At Rexroth, quality is measured For example: two SILENCE pumps were tested by the Rexroth development department after 10,000 operating hours in customer use. While used in fork lift trucks, the pumps were exposed to peak pressures of 300 bar. Efficiency, pulsation and noise emission were then carefully measured and checked. Result after 10,000 operating hours: these SILENCE pumps displayed excellent performance. Noise level and pulsa- tion levels tested same as new condition. This confirms Rexroth's belief that Silence cost premium, particularly relative to precise gear...

It is not just our technology that ensures high quality of .Rexroth external gear machines, our associates also play an important role. Rexroth places considerable emphasis on training its associates, corporate suggestion scheme and on continuous process improvement. This includes targeted internal advanced training programs to encourage associates and enhance their skills to improve overall quality of Rexroth products. Many features in the Rexroth manufacturing process ensure uniform high quality of the external gear machines such as: statistical process con- trol, continuous process...

The perfect team at Rexroth In Rexroth's application centers, innovative ways of using external gear machines are constantly being developed. Particular attention is being paid to the interaction of hydraulics and electronics, as applied in Rexroth's hydrostatic fan drives, for example: Rexroth Electronic Sensors measure engine oil, coolant and emmission temperatures to precisely control the fan drive and/or external gear pump, external gear motor. This efficient linking of hydraulics and electronics results in considerably less energy used for the coolant system while improving...

Production developments (Engineering) at Rexroth: simulating, optimizing and testing Interlinked development The development process at Rexroth follows the strict guidelines and regulations from the automotive industry with regard to procedure and milestones. In order to guarantee trouble-free production from the concept stage, the engineering work is closely linked to production planning. This includes joint decisions on appropriate production methods and processes. Results of this clearly defined approach is a high quality and value in the product. Defined testing programs Ascertaining...

External gear machine services Rexroth does not just leave you to sort through the huge number of versions yourself. From the very beginning, we are happy to assist you in choosing the right external gear machine - either in person or via the external gear machine configurator. Once you have made your choice, our immediate delivery program may be relevant for you: Rexroth maintains stock of certain standard pumps that are in high demand. However, even customer-specific solutions are guaranteed to be available quickly. Expert contacts from our Service Department located in over 80 sights...