A cycloidal drive or cycloidal speed reducer is a mechanism for reducing the speed of an input shaft by a certain ratio. Cycloidal speed reducers are capable of high ratios in compact sizes.

The input shaft drives an eccentric bearing that in turn drives the cycloidal disc in an eccentric, cycloidal motion. The perimeter of this disc is geared to a stationary ring gear and has a series of output shaft pins or rollers placed through the face of the disc. These output shaft pins directly drive the output shaft as the cycloidal disc rotates. The radial motion of the disc is not translated to the output shaft.

High reduction ratios, without sacrificing efficiency.

Compact designs, without requiring special motors. Exceptional shock load capacity, without having to oversize.

Greater overhung load capacities, without using expensive special components.

A precision backlash option, without resorting to special gearing.

BENEFITS
High Efficiency Cycloidal Reducer Design	Single stage reduction ratios up to 71:1 saves space Rolling motion minimizes friction and wear, reducing heat, resulting in a 95% efficiency rating per stage 500% shock load capability as there are only compressive forces rather than shear forces on the tooth Low speed of cycloidal wheel results in minimal reflected inertia less wear, and extremely long service life Due to the large overall "tooth / pin" contact area, select a Reducer using smaller mechanical service factors
Two Backlash Ratings	Standard backlash offers the highest available torque rating at an economical price Precision backlash results in tighter positional tolerances
Multiple Inputs: NEMA C-Face, Servo Square Flange, Shaft Input, Shovel Base, Top Mount	Versatility to fit whatever prime mover is needed for the application NEMA and servo input flanges are compact "quill-style" hollowbore configuration, eliminating input couplings and guards Quill-style input features an input support bearing to control fretting corrosion between motor shaft and reducer hub, and permit tighter internal tolerances NEMA input flange includes threaded back-off holes for easy motor removal
Straddle Mount Output Shaft Bearings (sizes D, E, F)	Supports output shaft and drive pins to provide exceptional overhung and thrust load capability, without the need for special bearings or housings
Multiple Mounting Options: Base, Flange, Ring	Versatility to fit anywhere on your machine Ring style allows output bearing to extend well within the machine for greatest overhung load rating