In the next section, we'll take a look at a real transmission.Īudi's seven-speed S tronic transmission allows drivers to use its D (Drive) or S (Sport) modes. The fork slides the collar on the yellow shaft to engage one of two gears. The gear shift knob moves a rod connected to the fork. You can also see how a small linear motion in the gear shift knob allows you to change gears.At every gear change you have to press and release the clutch twice, hence the name "double-clutching." Then you push the clutch pedal in again and lock the collar into the new gear. The idea is to get the blue gear of the next gear and the collar rotating at the same speed so that the dog teeth can engage. Then you release the clutch pedal and rev the engine to the "right speed." The right speed is the rpm value at which the engine should be running in the next gear. This takes the pressure off the dog teeth so you can move the collar into neutral. In double-clutching, you first push the clutch pedal in once to disengage the engine from the transmission. Double-clutching was common in older cars and is still common in some modern race cars.
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