【正文】 r based on the principle of variable twisted into various stalls of different transmission ratio corresponding to adapt to different operational conditions. General to set up a manual gearbox input shaft, intermediate shaft and output shaft, also known as the threeaxis, as well as Daodang axis. Threeaxis is the main transmission structure, input shaft speed is the speed of the engine, the output shaft speed is the intermediate shaft and output shaft gear meshing between different from the speed. Different gears are different transmission ratio, and will have a different speed. For example Zhengzhou richan ZN6481W2G manual transmission carSUV, its transmission ratio are: 1 File :1。 stalls :1。 stalls 1:1 5 stalls (speeding file) : 1. When drivers choose a launch vehicle stalls, Plectrum will be 1 / 2 file synchronization engagement with a back stall gear and output shaft lock it, the power input shaft, intermediate shaft and output shaft gear of a stall, a stall the output shaft gear driven, and the output shaft power will be transmitted to the drive shaft (red arrow). A typical stall Biansuchilun transmission ratio is 3:1, that is to say three laps to the input shaft and output shaft to a circle. When the growth rate of car drivers choose two stalls, Plectrum will be 1 / 2file synchronization and file a joint separation after 2 stall and lock the output shaft gear, power transmission line similar, the difference is that the output shaft gear of a stall 2 stall replaced by the output shaft gear driven. 2 stall Biansuchilun typical transmission ratio is :1, laps to the input shaft and output shaft to a circle than a stall speed increase, lower torque. When refueling vehicle drivers growth stalls option 3, Plectrum to 1 / 2 back to the free filesynchronization position, and also allows the 3 / 4 file synchronization Mobile stall until 3 in the output shaft gear lock, power can be into the shaft axis intermediate shaft the output shaft of the three stalls Biansuchilun, led through three stalls Biansuchilun output shaft. 3 stalls typical transmission ratio is :1, laps to the input shaft and output shaft to a circle is further growth. When car drivers Option 4 refueling growth stalls, Plectrum will be 3 / 4 from the 3file synchronization stall gear directly with the input shaft gear joint initiative, and power transmission directly from the input shaft to the output shaft, the transmission ratio at 1:1, that the input shaft and output shaft speed the same. The driving force without intermediate shaft, also known as direct file, the file transmission than the maximum transmission efficiency. Most cars runtime files are used directly to achieve the best fuel economy. Shift into the first interval when, in a free transmission when Biansuchilun output shaft is not locked in, they cannot rotate the output shaft driven, not power output. General automotive manual transmission than the main 14 stalls, usually the first designers to determine the minimum (one stall) and maximum (4 files) transmission ratio, the middle stall drive by geometric progression than the general distribution. In addition, there are stalls Daodang and speeding, speeding file is also known as the five stalls. When the car to accelerate to more than car drivers with the choice of five stalls, and a typical fivetransmission ratio is :1, which is driven by a pinion gear, the gear when the initiative to zone, passive gear have been transferred to a circle of the End. Dao Dang, the opposite direction to the output shaft rotation. If one pair of meshing gears when we reverse rotation, with a middle gear, it will bee the same to the rotation. Use of this principl