The gearbox is one of the most important parts of a car. As we all know, its role is to change the speed. Everyone knows that the transmission can be roughly divided into an automatic transmission and a manual transmission.
The manual gearbox is mainly composed of gears and gear shafts. The gear ratio between the different gears is used to change the gear ratio of the car so as to achieve the purpose of variable speed torque change. The automatic gearbox AT is composed of hydraulic torque converter, planetary gears and hydraulic pressure. The control system is composed of hydraulic transmission and gear combination to achieve variable speed torque (engine torque). It can be understood in a narrow sense that the automatic transmission is a manual transmission with an auxiliary transmission device to free people’s hands. However, from the standpoint of gear division, the gearbox can be further classified into a step-variable transmission and a continuously variable transmission. There is a clear gear division before the latter and the latter does not.
There are three main functions of the gearbox:
First, change the transmission ratio; and the so-called transmission ratio is the speed ratio between the two gears combined under the gear, the greater the transmission ratio, the stronger the dynamics, such as the 1st, 2nd gear; the smaller the transmission ratio, the faster the car Fast, such as more than 5 files.
Second, in the case of the same direction of engine rotation, so that the car can drive backward; the principle is to add a reverse gear between the main driven wheel to achieve reverse rotation of the power output shaft gear to change the power output direction.
Third, to achieve the power of the car under different conditions, the use of neutral, interrupted power transmission, so that the engine can start, idle, and easy transmission shift or power output.
It should be emphasized that the input and output shafts of the transmission are connected to clutches and transmission shafts, respectively.
On the basis of single piece ring rolling process, numerical simulation is conducted on the forming process of double piece ring rolling. By analyzing the stress-strain distribution, geometric shape, and forming size of the forming process, it is shown that the stress-strain distribution law is generally consistent with the deformation process of single piece ring rolling, and the geometric shape and forming size meet the requirements. By comparing and analyzing the material utilization rate of single and double piece ring rolling forming, it is found that the material utilization rate of the double piece ring rolling forming process is improved compared to the single piece ring rolling forming process, and the production efficiency is improved and the cost is reduced. The proposal of this process provides an important theoretical basis for future production practice.