R.DR. Helical Gearmotors

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R Series Helical Gear Units

Helical gear units are the “hidden classics” in the gear unit portfolio: 6 single-stage and 14 two- and three-stage frame sizes cover a torque range from 50 to 18 000 Nm. This gear unit series is also far ahead in terms of gear unit ratios: from i = 1.30 to i = 289.74, in double gear units even i = 27 001. Torque ratings and gear unit ratios this finely stepped are hard to find in the market.

The demand for high output speeds or low weight is met by the R gear units as well, of course. Always with a high level of efficiency, helical gear units offer an optimum ratio between torque output and installation space. This means: a helical gear unit almost always fits your application.


Fourteen frame sizes allow for an optimum ratio between performance and space requirements
Finely stepped gear unit ratios up to i = 289.74; or i = 27 001 for double gear units
Available in foot- or flange-mounted design
Also available with reduced backlash

Please feel free to contact us – We are ready to help with any application. Call us at (208) 322-2425