Mini Cycloidal Reducers for Precision Rotary Positioning ApplicationsKen Thayer | August 30, 2018
DieQua's Twin Spin Mini line of cycloidal reducers provides high-precision, high-torque and zero-backlash for industrial robot applications. These compact reducers also provide higher torque, tilting moment and rigidity than flexspline strain wave gear reducers of similar size.
These features also make the Twin Spin Mini cycloidal reducers ideal for applications as large as machine tools and as small as optical systems.
Cycloidal reducers use a cycloidal gear with a special tooth or lobe geometry designed to work on the principle of rolling motion.
The input shaft is eccentrically mounted to a bearing that is assembled to the bore of the cycloidal disc, producing an eccentric motion around the input shaft axis as it rotates. The lobes of the cycloidal disc mesh with pins mounted to a stationary ring gear. The ring gear has a larger number of pins than the cycloidal disc, which rotates the disc at a higher rate of speed and in the opposite direction than the input shaft.
The output shaft contains roller pins that are assembled inside holes on the cycloidal disc. These roller pins rotate around the holes as the disc rotates and provide a steady, wobble-free rotation of the output shaft.
The reduction rate for a cycloidal drive can be calculated as follows:
r = (P - L)/L
where r=reduction rate; P = number of ring gear pins; L = number of lobes on the cycloidal disc
DieQua's Twin Spin Mini reducers are based on a proprietary reduction mechanism that permits smaller designs than any other cycloidal reducer manufacturer. The Twin Spin drives get their name from the fact that the flanges on both sides rotate at the same speed, with the reduction determined by the central input shaft. This allows for torque density and performance previously unavailable in frame sizes as small as 50 mm to 80 mm. Twin Spin reducers can provide two to three times the torque of competitive products.
The Twin Spin series consists of four basic design configurations.
- T series - smallest diameter
- E series - large-diameter mounting flange to better integrate the unit
- H series - hollow through bore for passing wires, lines, etc.
- M series - miniature series; 50 mm diameter (soon to include a 40 mm model)
Twin Spin mini units are ideal for any precise rotary positioning application requiring a compact package. Examples applications include medical equipment, collaborative and SCARA robots, water jet and plasma cutting heads, optics, small communication dishes and small machine tools.
For additional information, visit the DieQua website.