CONTINUOUSLY VARIABLE TRANSMISSION

CONTINUOUSLY VARIABLE TRANSMISSION

INTRODUCTION:

Manual transmissions (MT) are the most common in today's cars. This transmission only allows a limited set of fixed gear ratios. Usually MT dispose of 5 gear ratios, although there are gearboxes with 6 or 7.

C.V.T. (Continuously Variable Transmission) is a system that makes it possible to vary progressively the transmission ratio. So it allows selection of a infinite number of ratios, (between a minimum and a maximum value).

The purpose of CVTs is to vary the transmission ratio continuously
It depends on the CVT type:

1. Friction CVTs vary the radius of the contact point between two rotating objects, thus the tangential velocity;
2. Hydrostatic CVTs vary the fluid flow with variable displacement pumps into hydrostatic motors;
3. Ratcheting CVTs vary the stroke of a reciprocating motion, which is connected to a free wheel, resulting unidirectional rotation.

CVTs can improve efficiency by allowing the engine to operate always in its optimum R.P.M., whatever the vehicle's speed.

Benefits of operating in the optimum R.P.M are such as,

1.lower consumption.
2.less greenhouse gas emissions.
3.Better performance.

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