Continuously Variable Transaxle (CVT) Operation

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See the parts of a CVT in operation:
0:00 Start
0:15 Drive pulley
0:20 Driven Pulley
0:23 Steel push belt
0:30 Input shaft
0:40 Reverse clutch
0:48 Forward clutch
1:03 Output shaft
1:20 CVT operational theory
1:30 Low gear ratio (pulley ratio)
1:55 High gear ratio (pulley ratio)
2:45 MUST SEE! CVT Operational demonstration
2:48 Underdrive ratio (2.6:1) demonstration
3:00 Overdrive ratio (0.4:1) demonstration
4:15 Variable ratio and direct drive discussion
4:50 eCVT difference

Questions:
1. List the three major components of a CVT transmission
2. What is the purpose of the forward clutch? 
Use the "," and "." keys to step frame by frame through the video as necessary for the next three questions.
3. Is the CVT shown at timestamp 2:52 in under-drive, direct-drive, or over-drive mode? How can you tell?
4. Is the CVT shown at timestamp 3:29 in under-drive, direct-drive, or over-drive mode? How can you tell?
5. Is the CVT shown at timestamp 3:34 in under-drive, direct-drive, or over-drive mode? How can you tell?
6. What are some advantages of a CVT?
7. Are CVTs used in small cars or larger cars and trucks? Why?
8. What are some disadvantages of a CVT?
9. Tell me one thing you learned or found interesting in this video.

Weber State University (WSU) - Automotive Technology Department - Transmission Lab. GM Continuously Variable Transaxle (CVT) model VT25. How a belt-driven CVT Works.

Ford, GM, Honda, Chrysler (JATCO), and Nissan CVTs are similar. CVTs allow the engine to operate at the RPM for peak efficiency while increasing and decreasing the transmission drive ratio to change vehicle speed.

This video helps satisfy 2017 NATEF MAST Task A2.C.4. "Describe the operational characteristics of a continuously variable transmission (CVT)", a priority 3 task.

eCVTs are different and are demonstrated in another WeberAuto video.

Download the VT25 Range Reference Chart here: http://www.weber.edu/wsuimages/automotive/ASEP/VT25%20Range%20Reference%20Chart.pdf

http://www.weber.edu/automotive

This video was created and edited by John D. Kelly at WSU. For a full biography, see http://www.weber.edu/automotive/J_Kelly.html

Visit my other youtube channel https://www.youtube.com/user/vibratesoftware to see the amazing NVH app for vibration diagnosis! Donate to the Department of Automotive Technology at Weber state University here: http://advancement.weber.edu/givetowsu
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