Stepped transmission is the most widely used one. It uses a gear drive and has several fixed gear ratios. According to the different types of wheels used, there are two types of fixed-axis transmission (ordinary transmission) and axis-rotary transmission (planetary transmission). The gear ratios of sedan and light and medium truck transmissions usually have 3-5 forward gears and one reverse gear, and there are more gears in the combined transmission for heavy goods vehicles. The so-called transmission gear refers to the number of forward gears.
Continuously variable transmission refers to a transmission system that can continuously obtain any gear ratio within the transmission range. With stepless speed change, the best match between the drive train and the engine operating conditions can be obtained. Common continuously variable transmissions include a hydromechanical continuously variable transmission and a metal belt type continuously variable transmission (VDT-CVT).
The integrated transmission refers to a hydromechanical transmission consisting of a hydraulic torque converter and a gear-type stepped transmission. Its transmission ratio can be infinitely changed within a few intermittent ranges between the maximum value and the minimum value. More applications.