Successful lateral thinking

STOBER’s advanced right-angle servo gearbox.

STOBER has further developed its KS right-angle servo gearbox. In keeping with the motto “Power without Compromise”, it is now offered not only in two- and three-stage versions, but also in a one-stage version. The new series features robust bearing technology and high-quality gearing. Compared to other variants, the new one-stage version enables a higher output speed, for example. The gear ratio range has been extended on both the low and high ends for all variants. Users receive precise, low-backlash and maintenance-free solutions for highly dynamic requirements.

Pforzheim, Germany, 2025-05-30 – “Compared to multi-stage variants, one-stage right-angle servo gearboxes are not only more compact, they are also more robust thanks to the reduced number of components. And since there is only one gear ratio stage, this has a positive effect on energy efficiency,” explains Artur Wagner, Director of Research & Development Mechatronics at STOBER. The drive specialist from Pforzheim has further developed its two- and three-stage KS right-angle servo gearboxes and now also offers a new generation in a one-stage version. “We’re closing a gap in our portfolio,” says Wagner.

With their robust bearings and high-quality gearing, KS gearboxes are extremely durable. This makes them suitable for continuous operation, even at high speeds. This series also features very high torsional stiffness. The new one-stage version is available in ratios 2 and 4. By combining it with compact STOBER planetary gearboxes, it can be expanded into multi-stage gearboxes with ratios from 6 to 400. This has more than doubled the previous gear ratio range. It therefore covers an even wider range of applications. The new solution is also robust, rigid and low-backlash, making it suitable for dynamic requirements. STOBER has also standardized the type designation and adapted the design of the right-angle servo gearbox to the new, round shape of the planetary gearboxes.

Flexible and compact

“Just as with the two- and three-stage versions, designers can choose between three shaft designs,” explains Wagner. Thanks to these customized output geometries, KS gearboxes can be used for a variety of applications. The two- and three-stage gearboxes can be combined with various STOBER motors via direct attachment. Thanks to the space-saving drive, operators benefit from less weight in addition to high torque and the resulting increased power density. Because the mass moment of inertia of the gearbox is lower due to the absence of the motor adapter, users can take advantage of the full dynamics of the drive.

The brains behind it

Artur Wagner is responsible for the new generation. Having studied mechanical engineering, he began his career with the drive specialist in Pforzheim as a computational engineer more than 30 years ago. Today, he is responsible for design and development in the mechatronics department. “We are supporting the consistent optimization of our very broad product portfolio – which also includes the KS right-angle servo gearbox,” reports Wagner. “Thanks to low-friction bearings in the input, higher speeds can be realized. Most competitors, on the other hand, rely on preloaded tapered roller bearings, which are less efficient. STOBER has increased the nominal torques by up to 20 percent and increased the permissible input speed. Together with the smaller gear ratios, the customer can realize significantly higher output speeds – a clear advantage in the market. “Another highlight is the modular design throughout,” emphasizes Wagner. “By adding planetary gearboxes, multi-stage variants can be implemented flexibly – according to the customer’s exact requirements.”

Captions:

**Image 1:** STOBER has further developed its KS right-angle servo gearbox and offers it in a two-, three- and now one-stage version.

**Image 2:** The one-stage right-angle servo gearbox is more compact than the multi-stage variants and is also more robust due to the reduced number of components.

**Image 3:** The right-angle servo gearboxes can be combined with compact planetary gearboxes from STOBER.

**Image 4:** Artur Wagner, Director of Research & Development Mechatronics at STOBER.

Photo credits: STÖBER Antriebstechnik GmbH + Co. KG

You can find high-resolution image material for downloading here.

STOBER develops and produces precise, highly efficient drive components and systems, including gearboxes, motors, gear racks and drive controllers for custom solutions. They are used in various industries, including automation and robotics, as well as the plastics, packaging and machine tool industries. STOBER has 14 locations and 80 service partners in over 40 countries. In addition to its headquarters in Pforzheim, Germany, there are also production facilities in Hungary and the US. The family-owned company currently employs around 1,000 people worldwide.

Contact data for country-specific publication:

Germany:	Austria:
STÖBER Antriebstechnik GmbH + Co. KG Kieselbronner Str. 12 75177 Pforzheim, Germany Phone: +49 7231 582-0 sales@stoeber.de www.stober.com	STÖBER Antriebstechnik GmbH Hauptstraße 41a 4663 Laakirchen, Austria Phone: +43 7613 7600-0 sales@stoeber.at www.stoeber.at
Switzerland:
STÖBER Schweiz AG Rugghölzli 2 5453 Remetschwil, Switzerland Phone: +41 56 496 9650 sales@stoeber.ch www.stober.ch

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Press contact:
STÖBER Antriebstechnik GmbH + Co. KG
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Kieselbronner Str. 12
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Phone: +49 7231 582-1660
silvia.feder@stoeber.de
www.stoeber.de/en/

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STÖBER Antriebstechnik GmbH + Co. KG
Solveig Moll
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75177 Pforzheim│Germany
Phone: +49 7231 582-1183
solveig.moll@stoeber.de
www.stoeber.de/en/

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