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Continuously Variable Transmission (CVT)

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by

Khalil Sanders

on 19 August 2014

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Transcript of Continuously Variable Transmission (CVT)

Unlike traditional automatic transmissions, continuously variable transmissions don't have a gearbox with a set number of gears, which means they don't have interlocking toothed wheels. The most common type of CVT operates on an ingenious pulley system that allows an infinite variability between highest and lowest gears with no discrete steps or shifts.
Continuously Variable Transmission (CVT)
A Brief Timeline of CVT Innovation

1490 - da Vinci sketches a stepless continuously variable transmission
1886 - first toroidal CVT patent filed
1935 - Adiel Dodge receives U.S. patent for toroidal CVT
1939 - fully automatic transmission based on planetary gear system introduced
1958 - Daf (of The Netherlands) produces a CVT in a car
1989 - Subaru Justy GL is the first U.S.-sold production automobile to offer a CVT
2002 - Saturn Vue with a CVT debuts; first Saturn to offer CVT technology
2004 - Ford begins offering a CVT
Basic Automatic Transmission
CVT Basics
Pulley-based CVTs
Peer into a planetary automatic transmission, and you'll see a complex world of gears, brakes, clutches and governing devices. By comparison, a continuously variable transmission is a study in simplicity. Most CVTs only have three basic components:
A high-power metal or rubber belt
A variable-input "driving" pulley
An output "driven" pulley
CVTs also have various microprocessors and sensors, but the three components described above are the key elements that enable the technology to work.

Toroidal CVTs
Toroidal Trans Video
Torodial CVT (Con't)
Ford Freestyle DuraTec engine with CVT Transmission.
If you're wondering why the word "gear" still appears in the explanation of a CVT, remember that, broadly speaking, a gear refers to a ratio of engine shaft speed to driveshaft speed. Although CVTs change this ratio without using a set of planetary gears, they are still described as having low and high "gears" for the sake of convention.
Nissan Exroidal Toroidal CVT
Hydrostatic CVTs
Both the pulley-and-V-belt CVT and the toroidal CVT are examples of frictional CVTs, which work by varying the radius of the contact point between two rotating objects. There is another type of CVT, known as a hydrostatic CVT, that uses variable-displacement pumps to vary the fluid flow into hydrostatic motors. In this type of transmission, the rotational motion of the engine operates a hydrostatic pump on the driving side. The pump converts rotational motion into fluid flow. Then, with a hydrostatic motor located on the driven side, the fluid flow is converted back into rotational motion.
References
CVT - Continuously Variable Transmission. (n.d.). Retrieved July 28, 2014, from http://cars.about.com/od/thingsyouneedtoknow/a/CVT.htm

How CVT Transmissions Are Getting Their Groove Back – Feature – Car and Driver. (n.d.). Retrieved July 28, 2014, from http://www.caranddriver.com/features/how-cvt-transmissions-are-getting-their-groove-back-feature

Transmission Technologies. (2014, July 20). Retrieved from http://www.fueleconomy.gov/feg/tech_transmission.shtml

What Is a Continuously Variable Transmission (CVT)? - Edmunds.com. (n.d.). Retrieved from http://www.edmunds.com/car-technology/cvt-enters-the-mainstream.html

YouTube. (n.d.). Retrieved August 18, 2014, from http://youtube.com
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