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HANNOVER MESSE 2018, 23 - 27 April
Homepage>Exhibitors & Products >Gear Rack Drives

Gear Rack Drives

STÖBER ANTRIEBSTECHNIK

Exhibitor details
Logo Gear Rack Drives

Product description

Precision Gear Rack Drives - redesigned.
The Solution for maximum Power Density and powerful Dynamics.

In the past gear rack drives were generally developed from a planetary gear unit with a gearwheel fitted to the output shaft and the matching gear rack. But the overhung load on the gear unit from the rack and pinion combination is then so high that it actually determines the dimensioning. Utilisation of the gear unit torque can normally only be in the 40 - 60 % range.

STÖBER wanted to overcome this disproportionality of the resources used and developed a new concept for a super compact and highly efficient gear rack drive jointly with ATLANTA.

The most immediately striking feature of the new gear rack drive is the integral output bearing housing, a highly stiff supporting assembly for the rack pinion which relives the load on the flange-mounted planetary gear unit bearings. The reduced tilting moment of this construction makes it possible to base the drive design on the torque actually required and on the feed force.

As a rule this means that the gear unit can be a size smaller than normally used in the past. Due to the comparatively small pinions, a higher output speed is necessary to obtain the required feed rate. Which means that the gear ratio is lower and in many cases a single-stage planetary gear unit can be used instead of a two-stage.

This gives the outstanding power density that should encourage many designers to use redesigned gear rack drives. Improved linear stiffness has not been forgotten in the new design, because the pinions do not now have to be flange-mounted directly on the gear flange shaft's bolt circle. The new mounting system makes it possible to use rack pinions with a very small number of pinion teeth, which increases linear stiffness by up to 100 %.

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