1. According to the change of transmission ratio, the transmission can be divided into three types: stepless, stepless and integrated.
(a) Stepped transmissions: There are several selectable fixed gear ratios that use gearing. It can be divided into two types: a common gear transmission with fixed gear axis and a planetary gear transmission with partial gear (planetary gear) rotating on the axis.
(b) Stepless transmission: The transmission ratio can be continuously changed within a certain range. Commonly, there are hydraulic, mechanical and electric types.
(c) Integrated transmission: Composed of a stepless transmission and a stepless transmission, the transmission ratio can be infinitely changed within a range of several segments between the maximum value and the minimum value.
2. According to the mode of operation, the transmission can be divided into three types: forced operation, automatic operation and semi-automatic operation.
(a) Mandatory transmission: The shift lever is directly operated by the driver.
(b) Automatically Operated Transmission: Transmission ratio selection and shifting are performed automatically. The driver only needs to operate the accelerator pedal, and the transmission can control the actuator according to the load signal of the engine and the vehicle speed signal to achieve gear shifting.