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CVT
A continuous variator is a transmission system that has two pulleys whose effective inner diameter is variable. The transmission between the two pulleys is carried out by means of a "belt" made of metal links so that the diameter ratio of the pulleys progressively changes in the gear ratio. Since the belt is an inextensible element, the opening of one of the pulleys implies the reduction of the diameter of the other, nevertheless, an infinite number of developments is achieved achieving a continuous variation of the gait. Hence, this system is also called automatic transmission of continuous transmission.
AUTOMATIC
The automatic transmission is a transmission system that is able by itself to select all gears or ratios without the need for direct intervention of the driver. The change from one ratio to another is a function of both the speed of the vehicle and the speed of rotation of the engine, so that the driver does not need either clutch pedal or shift lever. The simple fact of stepping on the accelerator pedal causes the change of ratio as the engine varies in rotation speed. The result that the driver appreciates is that of a comfortable change that does not produce jerks and that allows him to give all his attention to the traffic. Therefore, the automatic transmission not only provides more comfort, but also gives the vehicle more active safety.
MANUAL.
The driver selects the gear through the change
The different relations are obtained by the combination of the different pinions, consequently with their dimensions.
In three-axle gearboxes, the double reduction gear system is generally used in gearboxes, as it is more compact and has the substantial advantage of having the input and output shafts aligned with one another. In order to obtain the different ratios or speeds, the driver drives a gear lever, by means of which the different synchronization hubs (synchronizers) are moved, which mesh with the sprockets that transmit the movement.