A CVT is a type of automatic transmission.
A conventional automatic transmission has a fixed number of rations (gears), which it changes between. In this respect it is similar to a manual transmission, although generally the mechanical parts are completely different, using epicyclic gears to provide the ratios. As it changes from one ratio to the next there is a slight pause in the transmission of power.
A CVT (continuously variable transmission) has a minimum and a maximum ratio, but can provide any ratio in between these limits - in effect it has a million gear ratios, and no pause when it changes from one to another. However, many manufacturers (e.g. Fiat, Audi, the former MG-Rover) use software to provide a number of artificial "gears" to provide European drivers with a driving experience closer to that provided by a conventional automatic. Japanese drivers seem more comfortable with the true CVT behaviour than European and American drivers.
For a comparison, consider a conventional transmission as a trumpet, capable of a number of fixed notes, and a CVT as a trombone - it can produce those same notes, but it glides seamlessly between them, and can produce an in-between note if required.
2007-07-23 21:11:37
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answer #1
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answered by Neil 7
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Difference Cvt And Automatic Transmission
2017-01-12 03:42:46
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answer #2
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answered by kadlec 4
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The continuously variable transmission (CVT) is a transmission in which the ratio of the rotational speeds of two shafts, as the input shaft and output shaft of a vehicle or other machine, can be varied continuously within a given range, providing an infinite number of possible ratios.
The continuously variable transmission should not be confused with the power split transmission (PST), as used in the Toyota Prius and other hybrid vehicles that use two or more inputs with one output, despite some similarities in their function.
A CVT need not be automatic, nor include zero or reverse output. Such features may be adapted to CVTs in certain specific applications.
Other mechanical transmissions only allow a few different discrete gear ratios to be selected, but the continuously variable transmission essentially has an infinite number of ratios available within a finite range, so it enables the relationship between the speed of a vehicle engine and the driven speed of the wheels to be selected within a continuous range. This can provide better fuel economy than other transmissions by enabling the engine to run at its most efficient speeds within a narrow range.
CVTs have been refined over the years and are much improved from their origins.
2007-07-23 06:36:07
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answer #3
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answered by cgriffin1972 6
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QUITE A BIT! Automatic transmissions use clutch packs and planetary gear sets and hydraulics to shift each ratio and have to actually down shift when power is wanted. CVT transmissions use a steel belt and two cone shaped pulleys that change diameter by squeezing the steel belt the transmission has an infinite amount of ratios keeping the engine in the correct rev range all the time really saves fuel. Feels kind of strange at first almost like the trans is slipping car speeds up and RPM stays the same is how I describe it.
2007-07-23 07:16:49
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answer #4
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answered by John Paul 7
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The Continuously Variable Transmission (CVT) is a transmission in which the ratio of the rotational speeds of two shafts, as the input shaft and output shaft of a vehicle or other machine, can be varied continuously within a given range, providing an infinite number of possible ratios.
The Automatic Transmission uses set of gears which limit the possible number of ratios, typically 4 or 5. Six speed automatics (providing six ratios are available in some high end vehicles).
2007-07-23 06:39:39
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answer #5
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answered by radar 3
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A CVT can give you any ratio between its smallest and largest limit. An ordinary automatic will have 4 static ratios which let the torque converter allow a gradual ratio change.
2007-07-23 08:25:12
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answer #6
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answered by Anonymous
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The difference is that in manual transmission the driver has to change gear continuosly but in automatic the engine does that for you; although, if you want, you can still change gear by moving the stick, and you do not need a clutch.
The beauty of automatics, and I have had many from automatice Rolls, Daimlers to minis, is that you start the engine, put it into D for drive, and off you go.
You can then travel more than 1,000 miles or more without even touching the gear stick.
Most people say that they would rather be in charge, but you are still in charge with an auto as explained above, and it is less tiring on long runs or in traffic. There is also an automatic `kick-down` which drops down a gear for overtaking at speed.
Disregard those who say that auto`s use more petrol, it`s just a well-quoted fallacy, it has never been proven, especially by those who quote it. The other reason is they say autos are expensive if the automatic gears go, but all gears, auto or not, are expensive. Out of 14 automatics only once did the auto let me down on the gearbox, but the car had done 232,000 miles!!
Go for it!
2007-07-23 06:41:14
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answer #7
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answered by Montgomery B 4
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