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2. Worm drive - Wikipedia

   en.wikipedia.org/wiki/Worm_drive

   Therefore, regardless of the worm's size (sensible engineering limits notwithstanding), the gear ratio is the "size of the worm wheel - to - 1". Given a single-start worm, a 20-tooth worm wheel reduces the speed by the ratio of 20:1. With spur gears, a gear of 12 teeth must match with a 240-tooth gear to achieve the same 20:1 ratio.

3. List of gear nomenclature - Wikipedia

   en.wikipedia.org/wiki/List_of_gear_nomenclature

   A crossed helical gear is a gear that operate on non-intersecting, non-parallel axes. The term crossed helical gears has superseded the term spiral gears. There is theoretically point contact between the teeth at any instant. They have teeth of the same or different helix angles, of the same or opposite hand.

4. Duplex worm - Wikipedia

   en.wikipedia.org/wiki/Duplex_worm

   fig.1. A duplex worm or dual lead worm is a worm gear set where the two flanks are manufactured with slightly different modules and/or diameter quotients. As a result of this, different lead angles on both tooth profiles are obtained, so that the tooth thickness is continuously increasing all over the worm length, while the gap between two threads is decreasing.

5. Gear - Wikipedia

   en.wikipedia.org/wiki/Gear

   A worm is meshed with a worm wheel, which looks similar to a spur gear. Worm-and-gear sets are a simple and compact way to achieve a high torque, low speed gear ratio. For example, helical gears are normally limited to gear ratios of less than 10:1 while worm-and-gear sets vary from 10:1 to 500:1. [45]

6. Recirculating ball - Wikipedia

   en.wikipedia.org/wiki/Recirculating_ball

   Recirculating ball, also known as recirculating ball and nut or worm and sector, is a steering mechanism commonly found in older automobiles, off-road vehicles, and some trucks. Most newer cars use the more economical rack and pinion steering instead, but some upmarket manufacturers (such as BMW and Mercedes-Benz ) held on to the design until ...

7. Gear train - Wikipedia

   en.wikipedia.org/wiki/Gear_train

   Gear train. Transmission of motion and force by gear wheels, compound train. [1] Illustration by Georgius Agricola (1580) showing a toothed wheel that engages a slotted cylinder to form a gear train that transmits power from a human-powered treadmill to mining pump. A gear train or gear set is a machine element of a mechanical system formed by ...

8. Backlash (engineering) - Wikipedia

   en.wikipedia.org/wiki/Backlash_(engineering)

   Backlash (engineering) In mechanical engineering, backlash, sometimes called lash, play, or slop, is a clearance or lost motion in a mechanism caused by gaps between the parts. It can be defined as "the maximum distance or angle through which any part of a mechanical system may be moved in one direction without applying appreciable force or ...

9. Strain wave gearing - Wikipedia

   en.wikipedia.org/wiki/Strain_Wave_Gearing

   Strain wave gearing (also known as harmonic gearing) is a type of mechanical gear system that uses a flexible spline with external teeth, which is deformed by a rotating elliptical plug to engage with the internal gear teeth of an outer spline. The German company Harmonic Drive SE manufactured the first series-produced gears under the product ...