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  2. Gear train - Wikipedia

    en.wikipedia.org/wiki/Gear_train

    For the wide-ratio transmission, the first gear ratio is 4:1 or 4, and in second gear it is 2:1 or 2, so the progression is equal to ⁠ 4 / 2 ⁠ = 2 (or 200%). For the close-ratio transmission, first gear has a 4:1 ratio or 4, and second gear has a ratio of 3:1 or 3, so the progression between gears is ⁠ 4 / 3 ⁠, or 133%. Since 133% is ...

  3. Epicyclic gearing - Wikipedia

    en.wikipedia.org/wiki/Epicyclic_gearing

    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.

  4. Gear - Wikipedia

    en.wikipedia.org/wiki/Gear

    The opposite effect is obtained when a large gear drives a small one. The changes are proportional to the gear ratio r, the ratio of the tooth counts: namely, ⁠ T 2 / T 1 ⁠ = r = ⁠ N 2 / N 1 ⁠, and ⁠ ω 2 / ω 1 ⁠ = ⁠ 1 / r ⁠ = ⁠ N 1 / N 2 ⁠. Depending on the geometry of the pair, the sense of rotation may also be inverted ...

  5. List of gear nomenclature - Wikipedia

    en.wikipedia.org/wiki/List_of_gear_nomenclature

    The gear range is difference between the highest and lowest gear ratios and may be expressed as a percentage (e.g., 500%) or as a ratio (e.g., 5:1). Heel [ edit ]

  6. Strain wave gearing - Wikipedia

    en.wikipedia.org/wiki/Strain_Wave_Gearing

    Thus the rotation action of the wave generator results in a much slower rotation of the flex spline in the opposite direction. For a strain wave gearing mechanism, the gearing reduction ratio can be calculated from the number of teeth on each gear, in a similar manner to a cycloidal drive:

  7. Magnetic gear - Wikipedia

    en.wikipedia.org/wiki/Magnetic_Gear

    The magnetic gear is a magnetic coupling device that renders a mechanical ratio between two magnetically-coupled devices such that: They have a ratio of rotation or translational movement between input and output which may be unity in the case of a pure magnetic coupling or one of many gear ratios in a magnetic gearbox.

  8. Mechanical calculator - Wikipedia

    en.wikipedia.org/wiki/Mechanical_calculator

    For one cycle, they rotate 1/2, 1/4, and 1/12 of a revolution. . The 1/2-turn shaft carries (for each column) gears with 12, 14, 16, and 18 teeth, corresponding to digits 6, 7, 8, and 9. The 1/4-turn shaft carries (also, each column) gears with 12, 16, and 20 teeth, for 3, 4, and 5. Digits [1] and [2] are handled by 12 and 24-tooth gears on the ...

  9. Gear inches - Wikipedia

    en.wikipedia.org/wiki/Gear_inches

    Typical gear ratios on bicycles range from very low or light gearing around 20 gear inches (1.6 metres per revolution), via medium gearing around 70 gear inches (5.6 m), to very high or heavy gearing around 125 gear inches (10 m). As in a car, low gearing is for going up hills and high gearing is for going fast.