CVT

Question 1

What does CVT stand for?

Answer 1

Continuously variable transmission

Question 2

What is a continuously variable transmission?

Answer 2

A type of gearbox that can achieve any gear ratio, meaning the optimal engine speed can always be achieved.

Question 3

List 5 advantages of a CVT

Answer 3

Stepless change
No gear change jolt
Best gear can always be selected
Engine can remain in the optimal situation
Cheaper to produce

Question 4

Give one disadvantage of a CVT

Answer 4

Less suitable for high power - maximum torque is limited

Question 5

A CVT has 2 pulleys. Name them. How are they connected? How is the gear ratio adjusted?

Answer 5

Drive pulley
Driven pulley
Connected by a belt
Diameters of the pulleys are adjusted

Question 6

If the drive pulley is smaller than the driven pulley in a CVT, is the transmission overdrive or reduction? Why?

Answer 6

Reduction
The larger pulley will rotate slower

Question 7

What type of belt forms the connection between the 2 pulleys in CVT?

Answer 7

A push belt

Question 8

List the main 7 components of a CVT gearbox (in order of the process)

Answer 8

Torque converter
Hydraulic clutch
Primary pulley
Drive belt
Secondary pulley
Output shaft

Question 9

What does the primary pulley connect to? What about the secondary pulley?

Answer 9

The engine
The output shaft

Question 10

What is the function of the torque converter? What 2 other components is it found in between?

Answer 10

Ensures the engine can continue running when the car is stationary
The engine and hydraulic clutch

Question 11

What is the function of the hydraulic clutch? What 2 other components is it found in between?

Answer 11

Ensures the car can drive forward and reverse
The torque converter and primary (drive) pulley

Question 12

List 3 things that will happen when reverse is selected

Answer 12

The primary pulley will rotate in the opposite direction
The secondary pulley (driven) will rotate in the opposite direction
The torque converter will continue to rotate the same way

Question 13

What kind of gear system is found in a hydraulic clutch?

Answer 13

A planetary gear system

Question 14

List 3 things that will happen when you press the accelerator

Answer 14

The diameters of the pulleys change
The output shaft turns faster
The engine (and drive pulley) remains at a constant speed

Question 15

How is the pulley diameter made larger?

Answer 15

The belt is pushed outwards by bringing the 2 pulley halves closer together

Question 16

How are the 2 pulley halves adjusted?

Answer 16

By hydraulic pressure