A review on Continuously Variable transmissions (CVT)

Mechanical Engineering

Any transmission system's primary goal is to couple a high speed flywheel to a vehicle’s drive train, also to achieve high engine efficiency, responsive gear changes, and transmission efficiency. The unique way of achieving this task to use switch mode CVT.,which is mechanical analog of DC DC power electronic converter. Use of CVT increases fuel efficiency and it provides high transmission ratio. It varies progressively the transmission ratio. It allows selection of a infinite number of ratio (between a minimum and a maximum value). The flexibility of a CVT allows the driving shaft to maintain a constant angular velocity over a range of output velocities. This can provide better fuel economy than other transmissions by enabling the engine to run at its most efficient revolutions per minute (RPM) for a range of vehicle speeds. CVT systems are used in small tractors, snowmobile vehicles, scooters, harvesters, go-karts, drill presses, in aircraft electrical power generating systems,etc. Types of CVT systems are Variable-Diameter Pulley (VDP) or Reeves Drive, Toroidal or Roller-Based CVT, Infinitely Variable Transmission (IVT), Ratcheting CVT, Hydrostatic CVT, Variable toothed wheel transmission, Cone CVT. In this paper, we will study modeling and analysis of major componenets of full size passenger vehicle’s Switch mode CVT.

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