How do cycloidal gears work | Cycloidal gearbox in delhi

 

One way to classify gears is by the profile of the gear teeth: involute, cycloidal, or trochoidal. (Note that the trochoidal gears are used primarily in pumps.) The majority of gears used in motion control applications — including spur, helical, and bevel designs — are involute gears. However, cycloidal gears are a good choice for motion control applications that require very high gear ratios (often greater than 100:1), low friction, and excellent wear resistance. The tooth profile of the involute gear is the involute of the circle which is the curve that would be traced by a point on a line that rolls on the circumference of a circle. Precimotion is the best solution for a Cycloidal gearbox in delhi. Our engineering facilities are state-of-the-art and our team of professionals is in demand for their capability to existing gears and gearboxes for diverse applications and other services such as Servo planetary, Strainwave gearboxes, Six axis, Pick & place robots, AGV. (Cycloidal gearbox in delhi) 

 

Another way to visualize the involute of a circle is to imagine the curve that the end of a string wrapped around a cylinder would make as the string is unwrapped from the cylinder.

 

In contrast, the tooth profiles of cycloidal gearboxes are based on cycloids. To understand the cycloidal gears, it is important to understand epicycloids and hypocycloids. An epicycloid is the curve created when a circle rolls on the outside of another circle (referred to as the “base circle”). A hypocycloid is the curve created when a circle rolls on inside of a base circle.

 

In a cycloidal gearbox, the part of the tooth flank that lies outside the pitch circle (known as the addendum) is called epicycloidal. Conversely, the part of the tooth flank that lies inside the pitch circle (known as the dedendum) is called hypocycloidal.

 

Working: A unique principle of cycloidal gears is that the outer rolling circle used to create the addenda tooth flanks (epicycloids) on one gear is used as the inner rolling circle to create didenda tooth flanks (hypocycloids) of the other gear. This ensures the constant angular velocity and holds up the fundamental law of gearing, which states that the ratio of the gears’ angular velocities must remain constant throughout the meshing of the gears.

 

There are various designs of the cycloidal gearboxes, but the basic principle consists of an input shaft that is eccentrically mounted to a drive member or bearing, which drives a cycloidal disc in an eccentric motion. As the disc rotates, the lobes of the cycloidal disc act like the teeth and engage with pins on a stationary ring gear. The cycloidal disc also has roller pins that protrude through the disc and these pins attach to the output disc which transfers motion to an output shaft.

 

The number of lobes (teeth) on the cycloidal disc is lower than the number of pins (teeth) on the ring gear which provides speed reduction and the torque multiplication. To prevent “wobbling” of the output shaft, the roller pins connected to the output disc are mounted in the holes slightly larger than the pin diameter. A single cycloidal disc experiences the unbalanced forces which can be compensated by using a second cycloidal disc, offset from the first by 180 degrees.

 

The Cycloidal gears are much more difficult to manufacture than involute gears, requiring extremely accurate manufacturing and assembly. But they do offer the significant benefits in some applications. First, they can provide the transmission ratios up to 300:1 in a relatively small package — especially concerning the length of the gearbox — since they don ot require “stacking” of gear stages as planetary designs do. They also experience lower friction and less wear on the tooth flanks due to their rolling contact and lower Hertzian contact stress. And their good torsional stiffness and the capacity to withstand shock loads make them ideal for heavy industrial applications that also require servo precision and stiffness.