Cycloidal gearboxes or reducers contain four basic components: a high-speed input shaft, a single or compound cycloidal cam, cam followers or rollers, and a slow-speed output shaft. The input shaft attaches to an eccentric drive member that induces eccentric rotation of the cycloidal cam. In compound reducers, the first tabs on the cycloidal cam lobes engages cam followers in the casing. Cylindrical cam followers act as teeth on the inner gear, and the amount of cam supporters exceeds the amount of cam lobes. The second track of compound cam lobes engages with cam supporters on the result shaft and transforms the cam’s eccentric rotation into concentric rotation of the result shaft, thus increasing torque and reducing quickness.
Compound cycloidal gearboxes offer ratios ranging from as low as 10:1 to 300:1 without stacking levels, as in regular planetary gearboxes. The gearbox’s compound reduction and may be calculated using:
where nhsg = the number of followers or rollers in the fixed housing and nops = the number for followers or rollers in the slow velocity output shaft (flange).
There are several commercial variations of cycloidal reducers. And unlike planetary gearboxes where variations derive from gear geometry, heat treatment, and finishing procedures, cycloidal variations share fundamental design principles but generate cycloidal motion in different ways.
Planetary gearboxes are made up of three fundamental force-transmitting elements: a sun gear, three or more satellite or planet gears, and an interior ring gear. In an average gearbox, the sun gear attaches to the input shaft, which is connected to the servomotor. Sunlight gear Cycloidal gearbox transmits motor rotation to the satellites which, subsequently, rotate within the stationary ring equipment. The ring gear is section of the gearbox casing. Satellite gears rotate on rigid shafts linked to the earth carrier and cause the planet carrier to rotate and, thus, turn the output shaft. The gearbox gives the output shaft higher torque and lower rpm.