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Whether it involves robotics, machinery and tool manufacture, modern machines must execute rapid, precise movements, work reliably in the process and provide a long service life. These requirements necessitate gears which have minimal backlash and withstand high shock loads.
Precision gears from Nabtesco meet these requirements. They are used wherever rapid and precise positioning movements must be achieved with high loads and without post-oscillation. The variety of applications for gears is wide. We have adapted our product spectrum accordingly. A large selection of solid and hollow shaft gears are available for our customers: as components sets or ready-to-install gear heads. On request, we can deliver auxiliary gears which enable right-angle installation of motors as well as ratios higher than i = 300. We also work in close partnership with our customers to provide special solutions. And we offer the right lubricant for every gear.
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Principle of operation
The input gear transmits the rotation of the servo motor to the spur gears. The speed is reduced according to the transmission ratio between the input and spur gears. The spur gears are connected directly to the eccentric shaft by a spline shaft. Depending on the gear size, there are two or three of these shafts. The eccentric sections move the cam discs over needle bearings. They are supported by tapered roller bearings in the drive shaft and the retaining flange. The cam discs move around the connection base between the output flange and retaining flange.
The outer pins are arranged according to the pitch of the cam discs in the cycloidal ring. The cycloidal ring has a higher pitch than the cam discs. If the eccentric sections move an entire rotation, the cam discs rotate eccentrically one pitch of a pin. In the process, all the cams of the cam disc come into contact with the pins. The drive shaft transmits the rotation to the eccentric sections through the spur gear. These sections roll off the cam discs in the cycloidal ring, thus reducing the speed.
The entire reduction ratio is the product of the first and second reduction ratios.
