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How Does a Cycloidal Gearbox Works

There is certainly a myriad of gears available for several kinds of applications, the majority of them are employed to control the motion of the application. Amidst all, cycloidal gears are another option available for motion control operation that especially requires exorbitant gear ratios, low friction, and great wear resistance. 

The tooth profile of cycloidal gears

The tooth profiles of gears are based on the epicycloid and hypocycloid curves, it’s often modeled as the curves traced by a point on a line that rolls along the outside perimeter of an imaginary circle. The curves generated by a circle swirling around the outside and inside of another circle, respectively.

Construction & Working principle

The cycloidal gearbox basically consists of the drive shaft (also called eccentric shaft), ring pins, that are fixed in place and are arranged in a circle around the eccentric shaft in which the drive shaft engages. There are holes punctured on the cycloidal disc, where the roller pins go in or are engaged to drive the shaft. This way the cycloidal disc drives the pin disc, to which the centrally mounted output shaft is linked coaxially with the input shaft.

During the operation when the two toothed gears mesh, they have a peculiar effect on the space around them. When these teeth sprint and make contact with one another, an imaginary circle is drawn through their point of engagement called a pitch circle. The curves on the tooth space outside the pitch circle are known as addenda while the inside ones are dedendum. One gear’s addendum will always rest within the other that it meshes against together at different speeds, which makes them useful for applying torque against each other. Moreover, as the disc rotates, the lobes of cycloidal discs act like teeth and mesh with pins on a fixed ring gear. Then roller pins protrude through the disc and transfer motion to the output shaft.

The gears which are used in cycloidal engines have a very peculiar shape. Their teeth are convex epi-cycloid and the pinion they connect have concave hypocycloidal shapes, as those curves were generated by the same curve for both types of gear. This ensures that motion is transferred at locally constant velocity without any interference with frictional forces or other worries like wear-and-tear on either one of them because there’s no contact between them when moving, their tooth addenda match up perfectly due to this design choice. Besides, the number of teeth mounted on the cycloidal disc is lower than the number of pins on the ring gear, which enables them to achieve low speed as well as torque multiplication.

The cycloidal gears are manufactured in such a way that the pins Connected to the output shaft don’t unbalance, provide a higher transmission ratio, and offer significant benefits during the application.

 HZPT is one of the biggest cycloidal gearbox manufacturer in China. We especially design our gears to fit accuracy with the drive and output shaft so that it experiences low friction, and less wear in the tooth flanks during their contact. Moreover, we design our gears that have good torsional stiffness as well as the capacity to withstand shock loads, hence these features make our gears apt for heavy applications. So, if you’re looking to buy any kind of gears, visit  https://hzpt.com/

To get any help and advise we are available on 88220971