(1) Driving gear and driven gear. The input shaft can be understood as being connected to the clutch and rotating under the driving of the engine. The gear fixed on the input shaft is synchronously rotated. The gear is called the driving gear and the gear connected with the output shaft is then forced to rotate. This gear is called a driven gear.
(2) Transmission ratio i. The ratio of the number of teeth of the driven gear to the number of teeth of the drive gear is defined as a gear ratio.
When the relationship between the number of teeth of the driven gear and the number of teeth of the driving gear changes, the gear ratio i changes, and under the condition that the engine rotation speed does not change, the output shaft rotation speed changes, that is, the wheel rotation speed changes. A pair of meshing gears will not change the number of teeth in use, so its gear ratio is fixed. If a plurality of gears with different numbers of teeth are arranged on the input shaft and the corresponding gears on the output shaft are also meshed with changing gears, a set of stepped transmissions with different gear ratios i can be obtained. The automobile transmission is based on this basic principle to achieve gear shifting.
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