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  2. Gear train - Wikipedia

    en.wikipedia.org/wiki/Gear_train

    Formula If a simple gear ... The final gear ratio of the compound system is 1.62 × 2 ≈ 3.23. For every 3.23 revolutions of the smallest gear A, ...

  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. 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. Ravigneaux planetary gearset - Wikipedia

    en.wikipedia.org/wiki/Ravigneaux_planetary_gearset

    The Ravigneaux gearset is a double planetary gear set, invented by Pol Ravigneaux, who filed a patent application on July 28, 1949, in Neuilly-sur-Seine France. [1] This planetary gear set, commonly used in automatic transmissions, is constructed from two gear pairs, ring–planet and planet–planet. The gearset provides four forward gear ...

  6. Mechanical advantage - Wikipedia

    en.wikipedia.org/wiki/Mechanical_advantage

    The speed ratio for a pair of meshing gears can be computed from ratio of the radii of the pitch circles and the ratio of the number of teeth on each gear, its gear ratio. Two meshing gears transmit rotational motion. The velocity v of the point of contact on the pitch circles is the same on both gears, and is given by

  7. Simpson planetary gearset - Wikipedia

    en.wikipedia.org/wiki/Simpson_planetary_gearset

    The Simpson planetary gearset is a compound planetary gear train consisting of two planetary gearsets sharing a common sun gear. A Simpson gearset delivers three forward gears and one reverse, plus neutral, and is commonly employed in three and four ratio automatic transmissions . [ 1 ]

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    www.aol.com/finance/wildfires-snow-holiday...

    The US economy kicked off 2025 by adding 143,000 jobs in January, fewer than expected; but the unemployment rate dipped to 4%, according to data released Friday by the Bureau of Labor Statistics.

  9. Ford 6R transmission - Wikipedia

    en.wikipedia.org/wiki/Ford_6R_transmission

    A conventional planetary gearset and a compound Ravigneaux gearset is combined in a Lepelletier gear mechanism ... Gear Ratio −3.4025 [n] 4.1708 2.3397 [o] 1.5211 1 ...