Cycloidal gearboxes or reducers consist of four basic components: a high-speed input shaft, an cycloidal gearbox individual 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 substance reducers, the first an eye on the cycloidal cam lobes engages cam fans in the housing. Cylindrical cam followers act as teeth on the inner gear, and the number of cam supporters exceeds the number of cam lobes. The second track of substance cam lobes engages with cam followers on the output shaft and transforms the cam’s eccentric rotation into concentric rotation of the output shaft, thus raising torque and reducing rate.
Compound cycloidal gearboxes offer ratios ranging from as low as 10:1 to 300:1 without stacking phases, as in regular planetary gearboxes. The gearbox’s compound decrease and may be calculated using:
where nhsg = the amount of followers or rollers in the fixed housing and nops = the quantity for followers or rollers in the gradual speed output shaft (flange).
There are several commercial variations of cycloidal reducers. And unlike planetary gearboxes where variations are based on gear geometry, heat therapy, and finishing procedures, cycloidal variations share basic design principles but generate cycloidal motion in different ways.
Planetary gearboxes are made of three basic force-transmitting elements: a sun gear, three or more satellite or world gears, and an internal ring gear. In a typical gearbox, the sun equipment attaches to the input shaft, which is linked to the servomotor. Sunlight gear transmits engine rotation to the satellites which, subsequently, rotate within the stationary ring gear. The ring gear is part of the gearbox housing. Satellite gears rotate on rigid shafts connected to the earth carrier and trigger the earth carrier to rotate and, thus, turn the result shaft. The gearbox provides output shaft higher torque and lower rpm.
Planetary gearboxes generally have single or two-equipment stages for reduction ratios ranging from 3:1 to 100:1. A third stage could be added for also higher ratios, but it is not common.
The ratio of a planetary gearbox is calculated using the next formula:
where nring = the amount of teeth in the internal ring gear and nsun = the amount of tooth in the pinion (input) gear.
Great things about cycloidal gearboxes
• Zero or very-low backlash stays relatively constant during life 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 Gear technology is the far superior choice in comparison with traditional planetary and cam indexing products.