Sobetra Automation

News

There is now a new range of precision gear reducers for servo applications available: DYNABOX.

It's not just one more series of planetary gears, of which you can easily find so many on the market, but a concept that is intentionally innovating on several points.

The used gearing technology –worm and wormwheel– although not exactly revolutionary, has some very interesting advantages:

Robustness, great resistance to overtorque;

Silent operation (less than 55 dBA);

The use of right angle gearbox means in most cases a saving of space.

However, this type of gearing has usually three major drawbacks:

the wear of the bronze wheel, which makes it incompatible with applications requiring great precision;

a low efficiency;

an often too low acceptable entry speed (1500 RPM).

To a certain extent, these three defects are linked. It is difficult to manufacture quality worm gears. Any error of profile will generate local overpressures, which will result in a significant overheating, causing a bad output, and finally wear.

The gearing constituting the DYNABOX is manufactured with margins approximately 4 to 6 times smaller than those used by the manufacturers of industrial reducers. Thus, there is a uniform contact pressure between the worm and the wormwheel.

The alloy the wormwheel is made of, is another major point: it was specially elaborated for the DYNABOX. The allowed proportion of impurity is 10 to 20 times smaller than the one admitted for a similar alloy by ISO or DIN standards.

Finally, the use of a polyglygol synthetic lubricant is the ultimate parameter that, on top of all the other, makes it possible to get the following results with the DYNABOX:

Absence of wear during the whole life of the reducer;

Output up to 95 %;

Input speed 4000 RPM (continuous duty) , 6000 RPM (intermittent duty);

An almost unlimited number of starts per hour.

The casing, made of a thermically treated light alloy, puts up a higher mechanical resistance than cast iron FGL250, while making it possible to reduce the weight of the reducer.

All sides are machined and make an easy and fast assembly possible.

The extended drive shafts, as well as the input and output bearings (with preloaded conical rollers) allow very significant radial and/or axial loads.

There is no maintenance necessary during the whole life of the reducer.
(> 26000 hours)

The following options are available:

3 ranges of angular backlash : angle of 1, 5 or 10 minutes;

single or double solid output shaft, keyed hollow output shaft, hollow output shaft with shrink disk coupling;

adaptor kit available for all servomotors on the market.

Reducers of DYNABOX range are used in the following applications:

Robots;

Packaging machinery;

Feed of punching machines;

Printing machinery;

Medical equipment (scanners, radiology apparatus...);

Digitally controlled machine tools.

More than one hundred thousand reducers (including the previous range, which used same technology as the DYNABOX) are operating all over the world, in car manufacturing, chip manufacturing, hospitals, machining workshops... to the greatest satisfaction of their users.