Continuously Variable Transmissions (CVT)

What is a CVT?A continuously variable transmission

(CVT) is a transmission which can change seamlessly through an infinite number of

effective gear ratios. This allows the motor to putout the proper amount of power improving on efficacy of traditional transmissions.

Basics of TransmissionThe job of the transmission

is to change the speed ratio between the engine and the wheels of an automobile.

The transmission uses a range of gears -- from low to high -- to make more effective use of the engine's torque as driving conditions change. The gears can be engaged manually or automatically.

Types of CVT’sVariable-diameter pulley (VDP) or

Reeves drive

Toroidal or roller-based CVT

Infinitely Variable Transmission (IVT)

Ratcheting CVT

Hydrostatic CVTs

Variable toothed wheel transmission

Possible Markets for CVTsAutomobile

Heavy industry

Oil production

Wind Energy technology

Applications of cvt in automobile

Most major automobile companies have already started experimenting with CVT technology.

Can adapt to older vehicles with traditional transmissions.

Claims of a 20% gain in fuel economy compared to past transmission technology.

Applications of cvt in heavy industry

Fully adaptable drive system for industrial Land Vehicles.

Adjustments and maintenance made easer through smaller parts and computer monitoring technology.

Applications of cvt in Oil Production

Could reduce Power costs by allowing motors to maintaining constant loads.

Testing will show actual results. Right now its only speculation.

Applications of cvt in Wind Energy technology

Allows for a Possible 3.5 speed increase, allowing for a increase in efficiency.

Prevents over speeding of fan blades.

REDUCED COST!

Using CVT technology can reduce the cost of a wind turbine by about $80,000 ( ₹4813199.72 )

AdvantagesCVTs can compensate for changing vehicle

speeds, allowing the engine speed to remain at its level of peak power and efficiency. This improves fuel economy and reduce exhaust emissions.

There are 25% fewer moving parts to a CVT transmission.

Cheaper on wind power applications. And can prevent damage from high winds.

Benefits of CVTProvide engine torque in optimum condition (road

loads / drive shaft torque)

No shift clonk

Transmission ratio can be adjusted continuously

Improved fuel efficiency

Better acceleration

Eliminates gear hunting especially when going up a hill

AdvantagesCVTs can compensate for changing vehicle

speeds, allowing the engine speed to remain at its level of peak power and efficiency. This improves fuel economy and reduce exhaust emissions.

There are 25% fewer moving parts to a CVT transmission.

Cheaper on wind power applications. And can prevent damage from high winds.

Draw Backs of CVTBecomes Jerky in automobile applications

at slow speeds.

Intricate parts with high material cost. Examples of materials in CVT, Silicon Nitride, Silicon Carbide, Electroless Nickel, Electroplated Nickel

New technology so there are limited people that understand the operations with in a CVT.

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