Product category:
Drives, motors and power transmission, couplings, clutches
News Release from: Stober Drives | Subject: Mechanical variable speed drives
Edited by the Manufacturingtalk Editorial
Team on 04 December 2003
Mechanical variable speed drives comply
Following the introduction of EU Directive 94/9/EC, a drives manufacturer has announced that its mechanical variable speed drives are all compliant with this directive.
Following the recent introduction of the Directive 94/9/EC which covers any electrical or mechanical product that contains or constitutes a potential ignition source and which requires a special design or installation procedure to prevent an explosion, Stober Drives are pleased to announce that their own manufactured mechanical variable speed drives all are compliant with this directive The EC Directive 94/9/EC must have been adopted by the EU member states by 1st July 2003 as national law
This article was originally published on Manufacturingtalk on 19 Dec 2002 at 8.00am (UK)
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This however, was adopted in Germany in 1996.
Just because a mechanical variable speed solution is not the fashionable way to offer variable speed it does not mean it is not competitive.
When looking at the total solution cost a mechanical variator is still a competitive solution if the system only needs speed changes during set up or very rarely.
As with larger sized steplessly variable gear units the speed control works on the friction principle.
In the case of the RD11 drives two friction systems are connected in series.
This provides a rigid arrangement of input and output shafts, a completely closed gear case, a substantially larger speed range and at the same time clearly reduces overall dimensions compared to a single friction system.
Power transmission is by dry adherence between the two drive cone/raceway pairs.
The Stober MGS supplementary gears available in Helical Inline, Helical Shaft Mounted, Helical Bevel and Helical Worm which also meet the EC Directive 94/9/EC are employed to reduce the speed and increase the torque correspondingly.
The four available MGS series all stand out for their modular block design.
A connecting flange joins them to the variable speed gears, providing an attractive unit.
The mechanical speed variators on their own meet the following classifications: * RD11 - (adjustment range 10:1 only) II 3 G c/k T3; II 3 D c/k 120degC.
* R - II 2 G b/c/k T3; II 2 D b/c/k 120deg (with GTW).
* II 2 G b/c/k T4; II 2 D b/c/k 120deg (with GTW).
* II 3 G b/c/k T3; II 3 D c/k 120deg (without GTW - GTW is an option of temperature limit monitor).
When used with STOBER MGS gears the following classifications are made: * MGS with RD11 - II 3 G c/k T3; II 3 D c/k 120degC.
* MGS with R - II 2 G b/c/k T3; II 2 D b/c/k 120deg (with GTW).
* II 2 G b/c/k T4; II 2 D b/c/k 120deg (with GTW).
* II 3 G b/c/k T3; II 3 D c/k 120deg (without GTW).
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