Successfully thinking round the corner

Stöber has further developed its KS servo right-angle gearbox and now offers not only two- and three-stage versions, but also a single-stage version under the motto "Power without Compromise." The new series impresses with robust bearing technology and high-quality gearing technology. Among other things, the new single-stage version enables higher output speeds compared to the other variants. The gear ratio range has been expanded both upwards and downwards in all variants. Users receive precise, low-backlash, and maintenance-free solutions for highly dynamic requirements.

"Single-stage servo right-angle gearboxes are not only more compact than the multi-stage versions, but also more robust due to the reduced number of components. And since there is only one gear ratio, this has a positive effect on energy efficiency," explains Artur Wagner, Director of Research & Development Mechatronics at Stöber. The drive specialist from Pforzheim has further developed its two- and three-stage KS servo right-angle gearbox and now also offers a new generation of single-stage versions. "This closes a gap in our portfolio," says Wagner.

The KS gearboxes, with their robust bearing technology and high-quality gearing technology, are extremely resilient. This makes them suitable for continuous operation, even at high speeds. This series also boasts the very high torsional rigidity. The new single-stage version is available in ratios of 2 and 4. By combining it with the compact Stöber planetary gearboxes, it can be expanded to create multi-stage gearboxes with ratios from 6 to 400. This more than doubles the existing gear ratio range. It thus covers an even broader spectrum of applications. The new solution is also robust, rigid, and low-backlash, making it suitable for dynamic requirements. Stöber has also standardized the type classification and adapted the design of the servo right-angle gearbox to the new, round shape of the planetary gearboxes.

Flexible and compact

"Just as with the two- and three-stage versions, designers have the choice between three shaft designs," explains Wagner. Thanks to these individual output geometries, the KS gearboxes can be used flexibly. The two- and three-stage gearboxes can be combined with various Stöber motors via direct mounting. Thanks to the space-saving drive, operators benefit from reduced weight, high torque, and the resulting increased power density. Due to the gearboxes' lower moment of inertia due to the elimination of the motor adapter, users can utilize the full dynamics of the drive.

The brains behind it

Artur Wagner is responsible for the new generation. The mechanical engineering graduate began his career at the Pforzheim-based drive specialist more than 30 years ago as a calculation engineer. Today, he is responsible for design and development in the field of mechatronics. "We promote the consistent optimization of our very broad product portfolio – this also includes the KS servo right-angle gearbox," reports Wagner. "Thanks to low-friction bearing technology in the input drive, higher speeds can be achieved. Most competitors, on the other hand, rely on preloaded tapered roller bearings, which have lower efficiency."

Stöber has increased the rated torque by up to 25 percent and increased the permissible input speed. Combined with the smaller gear ratios, the customer can achieve significantly higher output speeds – a clear advantage in the market. "Another highlight is the completely modular design," emphasizes Wagner. "By connecting planetary gearheads in series, multi-stage variants can be flexibly implemented – entirely according to the customer's needs."