The continuously variable transmission (CVT), which was conceptualized more than 500 years ago, is just now beginning to replace traditional automatic transmissions in some automobiles. Test your knowledge of how CVTs work in this quiz.
The ratio of engine shaft speed to driveshaft speed is referred to as a:
Broadly speaking, the term "gear" refers to the ratio of the engine's shaft speed to the driveshaft speed. Conventional automatic transmissions change this ratio with a set of interlocking wheels.
What do conventional automatic transmissions have that CVTs don't?
Instead of a gearbox with a set number of gears and interlocking toothed wheels, CVTs usually operate on a pulley system that allows an infinite variability between gears.
Which of the following is not one of the key elements that enable CVT technology to work?
Although CVTs have various other parts, the three main components are the belt, a variable-input "driving" pulley and an output "driven" pulley.
The distance between the center of the pulleys to where the belt makes contact in the groove is known as:
When the pulleys are far apart, the belt rides lower and the pitch radius decreases. Likewise, when the pulleys are close together, the pitch radius increases.
Which pulley in a CVT transfers energy to the driveshaft?
As an output pulley, the driven pulley transfers energy to the driveshaft. The second pulley is called the "driven pulley" because the first pulley is turning it.
What does a toroidal CVT system replace the belts and pulleys with?
Although a system using discs and power rollers seems drastically different, all of the components are analogous to a belt-and-pulley system and lead to the same results -- a continuously variable transmission.
Which of the following is not one of the benefits of CVTs?
Because of their construction, CVTs improve fuel efficiency, achieve better acceleration and make for a smoother ride.
How much faster should a car with a CVT reach 60 mph (97 kph) than the same car with the same engine and a manual transmission?
Because CVTs cycle steadily into the appropriate gear ratio, they can reach 60 mph (97 kph) 25 percent faster than a car with manual transmission.
Who sketched the first continuously variable transmission?
In 1490, more than 500 years ago, Leonardo da Vinci conceptualized the very first CVT.
When was a CVT first produced in a car?
Daf (of the Netherlands) produced a CVT in a car for the first time in 1958.
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