Gearing boasts precision and performance
A
Servotechnic product story
Edited by the Engineeringtalk editorial team
Mar 15, 2005
Because it consists of only three simple parts, Harmonic Drive gearing from Nabtesco Precision offers design engineers the freedom to integrate drive components directly into machines or equipment.
Because it consists of only three simple parts, Harmonic Drive gearing from Nabtesco Precision USA offers design engineers the freedom to integrate drive components directly into machines or equipment.
The gear is a pure torque coupling with all concentric elements and requires less bulky support structures than conventional gearing.
The precision and performance offered by these products are ideal in applications requiring accurate positioning or precise motion control.
Natural gear preload and almost pure radial tooth engagement allow standard gearing to operate with essentially zero backlash for the entire gear life without preload adjustments or significant wear.
Measured on actual shaft-to-shaft losses rather than tooth losses (as with other gearing), standard gearing efficiencies are normally in the 80-90% range.
As torque is transmitted by pure coupling, the gearing does not generate radial loads and, therefore, can be used with much simpler bearings and less structural support then other forms of gearing.
Depending on size, Nabtesco Precision offer Harmonic Drive ratios from 50:1 to as high as 320:1.
Using compound drives, much higher ratios can be achieved.
Servotechnic reckons that pound for pound, no other mechanical power transmission can compare with this gearing for torque capacity.
The gearing's design ensures that approximately 10% of the total teeth are engaged at any point in time, minimising the effect of tooth-to-tooth error.
Accuracies as fine as 30arc-sec are achievable in some sizes.
Repeatabilities are in the arc-second range.
The gearing allows designers multiple input/output possibilities in speed reduction and speed increasing applications.
Concentric shafting makes it ideal for differential designs.
Proven in years of industrial, military, and other applications, the gearing has an average life of over 15kh at rated loads.
In addition, the tooth mesh is unaffected by the impact of stepping motors or frequent starts, stops, and reversals.
Harmonic Drive gears from Nabtesco Precision are available exclusively in the UK through Servotechnic.
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