New 4 th Generation PH Series Servo Planetary Gears are Largest inClass and offer Engineers even more benefits.

Engineering Industry News

The new 4 th generation of the PH series servo planetary gear units from STOBER are the largest on
the market in their performance class.

As well as being extremely precise, this new XL range is not only highly energy-efficient, but also has
same STOBER options of Motor Adaptor or Integrated Servo Motor versions. It is also able to
transfer high torques as, unlike conventional gear units, the force is distributed across multiple

Direct Mounting for More Dynamic Drives

The Integrated combination has a directly mounted compact EZ series synchronous servo motor.
Direct mounting brings the benefits of not requiring a separate adapter – saving space and making
the mass moment of inertia lower and the drive system more dynamic.

Also, with STOBER motor adapters, the engineer or designer can connect compatible third-party
motors to the gear unit series. The adapters are available with different couplings, as well as offering
the possibility of an integrated ServoStop brake.

The extra-large motor plate in the XL version means that the user can mount larger motors.
Additionally, the new PH gear units are also available with a Right-Angled input stage.

Smaller, Lighter and with Higher Torque

STOBER’s 4 th generation PH gear units are also up to 100mm shorter than the previous version,
which has a positive effect on their rigidity and mass of inertia. They are also lighter, require less

installation space, and in some cases, offer around 20% more torque – as well as a 50% increase in
tilting torques.

The combination of excellent housing and gearing quality increases the acceleration torque by up to
11%, and also increases the running accuracy and precision. In addition, there is a very high tilting

STOBER has also increased parameters such as power density and torsional stiffness and has
widened/more generously dimensioned the planetary gears for certain gear ratios.

State-of-the-art materials and hardening processes are also used for the planetary gears and sun
pinions, as well as lifetime lubrication with synthetic gear oil. This makes the new 4 th generation PH
gear unit series extremely stable and robust, and virtually eliminates servicing and repairs.

With a ratio range of 12 to 600, the new PH gear units are particularly flexible in use, and as well as
the standard PH version, STOBER also offers the Quattro design in its range. The PHQ series with a
four-planet system is also extremely precise with its high-quality helical gearing and offers even
greater torsional stiffness. The user also benefits from maximum torque.

A Multitude of Combinations from the 4 th Generation XL range

By request, STOBER will also combine the 4 th generation range with rack and pinion drives of the ZTR
and ZTRS series. This enables the user to benefit from high-performance geared motors, such as
those used in feed axes of machine tools.

STOBER has been one of the specialists manufacturing premier class gear units for almost 40 years
and has optimised the design of the new generation XL range to make it an integral part of the
company’s family of planetary gear units.

What’s more, owing to their high efficiency, these new planetary gear units are in demand wherever
size, precision, economy, and efficiency are critical to output and performance.
For more information about the new 4th generation of the PH series servo planetary gear units
contact STOBER on 01543 458858 or email [email protected]

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