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AMT Transmission vs CVT Transmission | Difference between AMT Transmission and CVT Transmission

This page compares AMT Transmission vs CVT Transmission and mentions difference between AMT Transmission and CVT Transmission. AMT stands for Automated Manual Transmission and CVT stands for Continuously Variable Transmission.

AMT Transmission | Automated Manual Transmission

AMT Transmission

• The figure-1 depicts planetary gear set used in AMT Transmission.
• It uses gears and clutches. The gearbox is almost similar to manual gearbox used in conventional system but the difference is gear shifting is done using control unit in AMT and no manual intervention is required.
• It changes gear ratios automatically when the vehicle moves.
• It eliminates effort of driver as clutch and gear shifting is done automatically using hydraulic process.
• It has limited number of gear ratios viz. 4 or 5 or 6 speed. This is similar to manual transmission.
• AMT engine is not operated continuously at a speed which delivers best efficiency.

CVT Transmission | Continuously Variable Transmission

CVT Transmission

• The figure-2 depicts most commonly used CVT type i.e. variable diameter pulley transmission.
• The gears are not used and are replaced by variable diameter pulleys. They are connected together using metal belt or chain. One pulley is connected with engine and the other is connected with drive wheels. Each of the pulleys are shaped like pair of opposing cones.
• CVT transmission, cones rotate due to centrifugal force and belt tension.
• CVT is also automatic transmission which uses infinite number of gear ratios between min. and max. values. This means CVT does not use fixed gear ratios like AMT Transmission.
• CVT transmission incurs less power loss compare to AMT Transmission.
• CVT engine is operated always with favourable speed to deliver best efficiency.

Advantages and disadvantages of CVT Transmission

Following are the advantages of CTV Transmission:
• Stepless Transmission
• Smooth drive
• Better Fuel Consumption
• Good Adaptability
• Better Emission Control

Following are the disadvantages of CTV Transmission:
• Limited amount of torque
• Higher cost
• High wear

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