Several types of noncircular gears generate variable output speeds, particularly elliptical gears. Here are a few examples that may stimulate some ideas about your own applications. Other applications require combined translation and rotation or stop-and-dwell motion. Some of the more common requirements handled by noncircular gears include converting a constant input speed into a variable output speed, and providing several different constant-speed segments during an operating cycle. For example, you may be able to change an output function by adjusting the phase relationship between two mating noncircular gears. Moreover, noncircular gears do offer limited ability to handle changing functional requirements. Also some companies lack the expertise to solve problems with servo systems. Servo systems may also be able to do the job, and they can be programmed to handle changing or complex functional requirements. Various mechanical systems, such as cams and linkages, can provide special motion requirements, but noncircular gears often represent a simpler, more compact, or more accurate solution. These oddly-shaped gears can fulfill several types of special motion requirements, and one of them may be the best solution for your application. If you have any further questions, we are at your disposal.When a machine must provide unusual displacement or speed characteristics, don’t overlook noncircular gears. If you want to learn more about this topic and the kinematics of non-circular gears, note our paper. The strength calculation of non-circular gears is not standardized however, it is still possible to use KISSsoft for an approximate strength calculation with specifically adapted methods. Once the geometry of non-circular gears is defined, strength verification is necessary.

However, because of variable loads and speeds, additional vibrations and bearing forces can occur, especially if the gears are not rotating around their mass center.

The main advantage of non-circular gears (in comparison to the cylindrical gears) is the variable transmission. Nevertheless, to achieve more complex transmission ratio functions, modified elliptical shapes, n-lobed ellipses or own functions can be used in KISSsoft for the operating pitch lines of the gears. The operating pitch lines of non-circular gears are commonly ellipses because of their simplicity. It is also possible to design them with variable center distance. Non-circular gears are typically designed to have variable output torque and speed. KISSsoft features the calculation of the geometry of non-circular gears for different operating pitch lines.

Non circular gears