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New spider makes couplings more powerful

ROTEX GS spider black

Johannes Deister

Product manager backlash-free servo couplings

T: +49 5971 798-465 E:

Our product portfolio includes a new spider increasing the performance level of the coupling by about 40 percent with temperatures from 60 °C.

The spider is primarily used in the servo coupling type ROTEX GS but can also be applied in standard ROTEX couplings. Main fields of application are drives with permanent temperatures from 60 °C to 120 °C, among them servo hydraulics and backlash-free gearboxes.

The new spider is particularly characterised by extreme compressive strength with temperatures of up to 120 °C while maintaining all positive technical properties such as damping and wear resistance. In addition there is the low temperature factor. 
With the new spider the performance level of the coupling already rises by 40 percent with 60 °C.

ROTEX GS hubs with spider in black

Extreme compressive strength at elevated temperature 
The material is a newly developed thermoplatic polyurethane, in brief: TPU, with 52 and 65 Shore D degrees of hardness. The material was tested up to 120 °C and with rated torque without torque reduction by the temperature factor with regard to function, component strength, wear and service life in KTR’s R & D centre in Rheine. 

The result was that the permanent deformation after the endurance test with 60 °C was significently smaller than with standard polyurethanes.

The new spider can be combined with all hub types of the range of backlash-free ROTEX GS servo couplings and is available for the sizes 19, 24, 28, 38 and 42; in addition the spider can be used in the standard ROTEX couplings.

We will present the new high-performance spider at this year’s EMO in Hannover, Germany, Hall 9, booth D33.  

Drive technology

Johannes Deister
Product manager backlash-free servo couplings