16-04-2012, 11:25 AM
Continuously Variable Transmission (CVT)
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Continuously Variable Transmission (CVT)
A Timeline of CVT Innovation
1490 - da Vinci sketches a stepless continuously variable transmission
1886 - first toroidal CVT patent filed
1935 - Adiel Dodge receives U.S. patent for toroidal CVT
1939 - fully automatic transmission based on planetary gear system introduced
1958 - Daf (of The Netherlands) produces a CVT in a car
1989 - Subaru Justy GL is the first U.S.-sold production automobile to offer a CVT
2002 - Saturn Vue with a CVT debuts; first Saturn to offer CVT technology
2004 - Ford begins offering a CVT
Basics of Transmission
The 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.
Benefits of CVT
Provide 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