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  2. Continuously variable transmission - Wikipedia

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

    For other ratios, the rollers are rotated along the surfaces of the discs so that they are in contact with the discs at points with different diameters, resulting in a drive ratio of something other than 1:1. [14] An advantage of a toroidal CVT is the ability to withstand higher torque loads than a pulley-based CVT. [15]

  3. Serpentine belt - Wikipedia

    en.wikipedia.org/wiki/Serpentine_belt

    Serpentine belt (foreground) and dual vee belt (background) on a bus engine Belt tensioner providing pressure against the back of a serpentine belt in an automobile engine. A serpentine belt (or drive belt [1]) is a single, continuous belt used to drive multiple peripheral devices in an automotive engine, such as an alternator, power steering pump, water pump, air conditioning compressor, air ...

  4. Belt (mechanical) - Wikipedia

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

    The angular speed is inversely proportional to size, so the larger the one wheel, the less angular velocity, and vice versa. Actual pulley speeds tend to be 0.5–1% less than generally calculated because of belt slip and stretch. In timing belts, the inverse ratio teeth of the belt contributes to the exact measurement. The speed of the belt is:

  5. Revolutions per minute - Wikipedia

    en.wikipedia.org/wiki/Revolutions_per_minute

    Revolutions per minute (abbreviated rpm, RPM, rev/min, r/min, or r⋅min −1) is a unit of rotational speed (or rotational frequency) for rotating machines. One revolution per minute is equivalent to ⁠ 1 / 60 ⁠ hertz .

  6. Underdrive pulleys - Wikipedia

    en.wikipedia.org/wiki/Underdrive_pulleys

    Poorly engineered underdrive pulleys can cause unwanted side effects; this is due to not spinning the alternator, power steering, and/or air conditioning fast enough. This leads to low alternator voltage, weak or no power steering assist, and weak or no air conditioning effectiveness, especially at idle or low RPM. The most commonly seen result ...

  7. Rope drive - Wikipedia

    en.wikipedia.org/wiki/Rope_drive

    The idea of using rope drives had arisen from his earlier, 1856, experiments in using a rope drive together with an expanding vee pulley, as part of a Van Doorne or Variomatic transmission. [4] Combe Barbour were makers of textile machinery and differential speed gearing was often needed as part of the spinning process, where one shaft could be ...

  8. Propeller speed reduction unit - Wikipedia

    en.wikipedia.org/wiki/Propeller_Speed_Reduction_Unit

    A propeller speed reduction unit is a gearbox or a belt and pulley device used to reduce the output revolutions per minute (rpm) from the higher input rpm of the powerplant. [1] This allows the use of small displacement internal combustion engines to turn aircraft propellers within an efficient speed range.

  9. Rotational frequency - Wikipedia

    en.wikipedia.org/wiki/Rotational_frequency

    Its angular frequency is 360 degrees per second (360°/s), or 2π radians per second (2π rad/s), while the rotational frequency is 60 rpm. Rotational frequency is not to be confused with tangential speed, despite some relation between the two concepts. Imagine a merry-go-round with a constant rate of rotation.

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