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Stober and Atlanta, a manufacturer of gear racks, have developed a concept for a super compact and highly efficient rack and pinion drive.

The Highforce ZTRS-PH(A) rack and pinion drive features an integral output bearing housing – a highly stiff supporting assembly for the rack pinion that relieves 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 unit.

The flange-mounted planetary gear unit offers a choice between the helical PH and PHA versions.

The pinions do not now have to be flange-mounted directly on the gear flange shaft’s bolt circle and it possible to use rack pinions with a very small number of pinion teeth, which increases linear stiffness by up to 100 per cent.

Apart from the linear stiffness, the linear backlash was also improved through a 40 per cent reduction.

The pinion concentricity is adjusted to 0.01mm.

The range of gear ratios and pinion teeth numbers allows optimised adaptation of the inertia.

There is also the optional pinion lubrication with felt pinions, which is integrated in the cast output bearing housing for manual operation or connection to a central lubrication system.

The Highforce ZTRS-PH(A) rack and pinion drive is available in sizes 7, 8 and 9, modules 2 to 6 and gearing quality 5.

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