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2. Strain wave gearing - Wikipedia

   en.wikipedia.org/wiki/Strain_Wave_Gearing

   The German company Harmonic Drive SE manufactured the first series-produced gears under the product name or registered trademark Harmonic Drive. Strain wave gearing has some advantages over traditional gearing systems such as helical or planetary gears, including: no backlash, compactness and light weight, high gear ratios,

3. Epicyclic gearing - Wikipedia

   en.wikipedia.org/wiki/Epicyclic_gearing

   This planetary gear train consists of a sun gear (yellow), planet gears (blue) and carrier (green) inside a ring gear (red) An epicyclic gear train (also known as a planetary gearset) is a gear reduction assembly consisting of two gears mounted so that the center of one gear (the "planet") revolves around the center of the other (the "sun").

4. Sun and planet gear - Wikipedia

   en.wikipedia.org/wiki/Sun_and_planet_gear

   The Whitbread Engine of 1785. The sun and planet gear is a method of converting reciprocating motion to rotary motion and was used in the first rotative beam engines.. It was invented by the Scottish engineer William Murdoch, an employee of Boulton and Watt, but was patented by James Watt in October 1781.

5. Cycloidal drive - Wikipedia

   en.wikipedia.org/wiki/Cycloidal_drive

   The cycloidal disc will independently rotate around the bearing as it is pushed against the ring gear. This is similar to planetary gearing. The direction of rotation of the disc and output is opposite to that of the input shaft. The number of pins on the ring gear is larger than the number of pins on the cycloidal disc.

6. Differential (mechanical device) - Wikipedia

   en.wikipedia.org/wiki/Differential_(mechanical...

   The left sun gear (red) provides more resistance than the right sun gear (yellow), which causes the planet gear (green) to rotate anti-clockwise. This produces slower rotation in the left sun gear and faster rotation in the right sun gear, resulting in the car's right wheel turning faster (and thus travelling farther) than the left wheel.

7. Continuously variable transmission - Wikipedia

   en.wikipedia.org/wiki/Continuously_variable...

   One agricultural example, produced by AGCO, splits power between hydrostatic and mechanical transfer to the output shaft via a planetary gear in the forward direction of travel (in reverse, the power transfer is fully hydrostatic). This arrangement reduces the load on the hydrostatic portion of the transmission when in the forward direction by ...