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  2. Gear train - Wikipedia

    en.wikipedia.org/wiki/Gear_train

    A gear train or gear set is a machine element of a mechanical system formed by mounting two or more gears on a frame such that the teeth of the gears engage.. Gear teeth are designed to ensure the pitch circles of engaging gears roll on each other without slipping, providing a smooth transmission of rotation from one gear to the next. [2]

  3. Cycloidal drive - Wikipedia

    en.wikipedia.org/wiki/Cycloidal_drive

    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. This causes the cycloidal disc to rotate around the bearing faster than the input shaft is moving it around, giving an overall rotation in the direction opposing ...

  4. Gear - Wikipedia

    en.wikipedia.org/wiki/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] A disadvantage is the potential for considerable sliding action, leading to low efficiency. [46]

  5. Transmission (mechanical device) - Wikipedia

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

    A transmission (also called a gearbox) is a mechanical device which uses a gear set—two or more gears working together—to change the speed, direction of rotation, or torque multiplication/reduction in a machine. [1] [2] Transmissions can have a single fixed-gear ratio, multiple distinct gear ratios, or continuously variable ratios. Variable ...

  6. Epicyclic gearing - Wikipedia

    en.wikipedia.org/wiki/Epicyclic_gearing

    Analysis assumes a common gear design modulus. The planetary gears (blue) turn in a ratio determined by the number of teeth in each gear. Here, the ratio is ⁠− + 27 / 18 ⁠, or ⁠− + 3 / 2 ⁠; meaning that each planet gear turns at ⁠ 3 / 2 ⁠ the rate of the sun gear, in the opposite direction. An outer ring gear is not shown.

  7. Precession (mechanical) - Wikipedia

    en.wikipedia.org/wiki/Precession_(mechanical)

    The direction of rotation of the inner part is opposite to the direction of rotation of the radial force. [ 1 ] In a rotating machine, such as motor, engine, gear train, etc., precession can occur when too much clearance exists between a shaft and a bushing , or between the races and rolling elements in roller and ball bearings .

  8. List of gear nomenclature - Wikipedia

    en.wikipedia.org/wiki/List_of_gear_nomenclature

    A face gear set typically consists of a disk-shaped gear, grooved on at least one face, in combination with a spur, helical, or conical pinion. A face gear has a planar pitch surface and a planar root surface, both of which are perpendicular to the axis of rotation. [1]

  9. Spiral bevel gear - Wikipedia

    en.wikipedia.org/wiki/Spiral_bevel_gear

    Spiral bevel gear. A spiral bevel gear is a bevel gear with helical teeth. The main application of this is in a vehicle differential, where the direction of drive from the drive shaft must be turned 90 degrees to drive the wheels. The helical design produces less vibration and noise than conventional straight-cut or spur-cut gear with straight ...