Remember, automatic transmissions came after the manual transmission and if you know how a manual works, you’ll get the basic idea of how an automatic transmission works. While a manual transmission requires the driver to manually change gear ratios, an automatic does this on its own through the use of fluid pressure.
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A transmission uses toothed gears that interact with each other in order to produce torque, and the gear ratio refers to the gears’ relation to each other. Say you have an input gear with 20 teeth that interacts with an output gear that has 10 teeth. In order to spin the gear with 20 teeth once, the 10 tooth gear must make two full rotations. A gear ratio is calculated by taking the number of teeth on the output gear and dividing it by the input gear. Thus the gear ratio in this example is 1:2 but it’s usually simplified to 0.5:1 in order to tell how many times the output gear must rotate for the input gear to make one full rotation. There are many gears in the transmission with different sizes, which allows for many gear ratio combinations.
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For example, an engine might produce its maximum horsepower at 5,500 rpm. The transmission allows the gear ratio between the engine and the drive wheels to change as the car speeds up and slows down. You shift gears so the engine can stay below the redline and near the rpm band of its best performance.
http://auto.howstuffworks.com/transmission.htm
There are a lot of intricacies in the different types of gears. In this article, we'll learn exactly how the teeth on gears work, and we'll talk about the different type­s of gears you find in all sorts of mechanical gadgets.­
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In this article, we'll answer all of these questions and more as we explore the interior of a manual transmission. Cars need transmissions because of the physics of the gasoline engine. First, any engine has a redline -- a maximum rpm value above which the engine cannot go without exploding. Second, if you have read How Horsepower Works, then you know that engines have narrow rpm ranges where horsepower and torque are at their maximum.
http://auto.howstuffworks.com/transmission.htm
Cars and motorcycles of today are equipped with efficient manual or automatic transmissions. This animation explains manual transmissions. Contents. 1) Basic principle of manual transmissions. 2) 2-speed manual transmission. 3) Gear ratio. 4) Shifting gears.
http://www.youtube.com/watch?v=K53cPGRE1Kk
To make the gear change smoother, let the gearshift pause for a second as it crosses the neutral zone. On your driving test the examiner will expect you to: 1  Choose the right gear for the speed you need to travel at, and for the road conditions you face. 2  Change gear smoothly, safely and under control.
http://www.driving-test-success.com/gears/gearinfo.htm
To change gear in a car 1  : Release the accelerator pedal and at the same time press the clutch pedal down. 2  Remove your left hand from the steering wheel, cup it around the gear knob and move the lever gently but positively from one position to another. 3  Return your left hand to the steering wheel.
http://www.driving-test-success.com/gears/gearinfo.htm
Know how the transmission system inside an automobile works. Do not forget to hit like if you found this video useful. Please Note: The differential gear system was mistakenly animated, and the actual rotation of the pinion and the ring gear is opposite to what is shown here.
http://www.youtube.com/watch?v=QPaUJfA1KsY
Gears allow a car to be driven with the minimum strain on the engine. Modern cars usually have five forward and one reverse gear, although some cars now have a sixth forward which gives greater fuel economy when driving at higher speeds over longer distances. To change gear in a car :
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how car gears work
In cars, the transmission allows the gear ratio between the engine and the drive wheels to change as the car speeds up and slows down. You shift gears so the engine can stay below the redline and near the rpm band of its best performance. The transmission allows the gear ratio between the engine and the drive wheels to change as the car speeds and slows down to ensure that the engine stays below the redline and near the RPM band of its best performance. 