Cycloidal gearboxes or reducers contain four fundamental components: a high-speed input shaft, a single or substance 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 track of the cycloidal cam lobes engages cam followers in the casing. Cylindrical cam followers act as teeth on the inner gear, and the number of cam followers exceeds the number of cam lobes. The second track of compound cam lobes engages with cam followers on the output shaft and transforms the cam’s eccentric rotation into concentric rotation of the result shaft, thus increasing torque and reducing velocity.
Compound cycloidal gearboxes provide ratios ranging from only 10:1 to 300:1 without stacking stages, as in regular cycloidal gearbox Planetary gearboxes. The gearbox’s compound decrease and can be calculated using:
where nhsg = the amount of followers or rollers in the fixed housing and nops = the number for followers or rollers in the gradual quickness output shaft (flange).
There are several commercial variations of cycloidal reducers. And unlike planetary gearboxes where variations are based on gear geometry, heat treatment, and finishing processes, cycloidal variations share fundamental design principles but generate cycloidal movement in different ways.
Planetary gearboxes are made up of three simple force-transmitting elements: a sun gear, three or even more satellite or world gears, and an interior ring gear. In a typical gearbox, the sun gear attaches to the insight shaft, which is linked to the servomotor. Sunlight gear transmits motor rotation to the satellites which, in turn, rotate within the stationary ring equipment. The ring gear is area of the gearbox housing. 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 result shaft higher torque and lower rpm.
Planetary gearboxes generally have single or two-gear stages for reduction ratios ranging from 3:1 to 100:1. A third stage could be added for even higher ratios, but it is not common.
The ratio of a planetary gearbox is calculated using the following formula:
where nring = the number of teeth in the inner ring gear and nsun = the amount of teeth in the pinion (insight) gear.
Great things about cycloidal gearboxes
• Zero or very-low backlash stays relatively constant during existence of the application
• Rolling rather than sliding contact
• Low wear
• Shock-load capacity
• Torsional stiffness
• Flat, pancake design
• Ratios exceeding 200:1 in a compact size
• Quiet operation
Ever-Power Cycloidal Equipment technology is the far excellent choice in comparison with traditional planetary and cam indexing devices.