1. The three-shaft transmission has three shafts, and the two-shaft transmission has two shafts; the input shaft and the output shaft of the two-shaft transmission are not on the same axis, and the two shafts are the first shaft ( input shaft), second shaft (output shaft).
The first shaft is the driven shaft of the clutch, and the second shaft is the driving shaft of the main reducer. It has a single-stage transmission and is mostly used in cars due to its small size. Different from the two-shaft transmission, the input shaft and output shaft of the three-shaft transmission are on the same axis. It has one more intermediate shaft than the two-shaft transmission, and it is a two-stage transmission. Due to the large torque generated and large body, it is mostly used by heavy-duty vehicles.
2. The forward gear of the two-shaft transmission has only one pair of gears meshing to transmit power from the input shaft to the output shaft; there is only one intermediate gear in the reverse transmission route, so the mechanical transmission efficiency is high and the noise is low. ?
The shaft-type transmission does not have a direct gear, so the mechanical efficiency of the highest gear is slightly lower than that of the direct gear. 3. The forward gears all use constant meshing helical gears, and the transmission is smooth; the gears are shifted by a synchronizer; the synchronizer can It can be installed on the input shaft or the output shaft. The overall structure is compact.
The cantilevered input shaft has no supporting relationship with the crankshaft. The clutch driven plate can be replaced by moving the transmission backward a small amount, eliminating the need to lift it off; the idler gear on the reverse gear shaft moves in conjunction with the one on the first shaft. The reverse gear meshes, and the idler gear meshes with the ring gear outside the coupling sleeve on the second shaft, thereby achieving reverse rotation.
Extended information:
(1) Driving gear and driven gear. The input shaft can be understood as being connected to the clutch and rotating under the drive of the engine. The gear fixed on the input shaft rotates synchronously. This gear is called the driving gear. After that, the gear connected to the output shaft is forced to rotate, so This gear is called the driven gear.
When the relationship between the number of teeth of the driven gear and the number of teeth of the driving gear changes, the transmission ratio i changes. Under the condition that the engine speed remains unchanged, it will affect the change of the output shaft speed, that is, the wheel speed. Change. For a pair of gears that mesh with each other, the number of teeth does not change during use, so its transmission ratio is fixed.
If a number of gears with different numbers of teeth are installed on the input shaft to mesh with the corresponding gears with changing numbers of teeth on the output shaft, a set of stepped transmissions with different transmission ratios i can be obtained. The automobile transmission realizes gear shifting according to this basic principle.
(2) Forward gear, a gear that enables the car to move forward. Reverse gear is a gear that enables the car to travel backwards. In neutral, each gear in the transmission is not in the working position. At this time, after the engine power is input to the input shaft, it is no longer transmitted to the output shaft.
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