The development of low speed truck

The development of low speed truck transmission is closely related to the progress of human society and the level of science and technology. With the progress of science and technology, each subject is more or less connected with each other. Industries communicate with each other and often use new technologies, new energy sources and new structures. Currently, low speed truck transmissions are moving toward large scale, high efficiency, reliability, energy saving, reduced consumption and automation. The gear drive chosen in this design is reasonable. The main functions of transmission are as follows:(1) change the transmission ratio to meet the traction requirements under different driving conditions, make the engine work under favorable conditions as far as possible, and meet the possible driving speed requirements. The drive speed and torque on the drive wheel can be varied over a wide range. Due to different driving conditions, the driving speed and torque of the vehicle are required to vary in a wide range. For example, the speed on the expressway should reach 100km/h, while in the urban area, the speed is usually about 50km/h. When an empty vehicle is traveling on a straight road, the traveling resistance is very small, so when the full load rises, the traveling resistance is very large. Automobile engine is characterized by small speed range, torque range can not meet the actual road conditions.(2) to achieve reverse, to meet the needs of car reverse. In order to reverse, the engine's crankshaft can only rotate in one direction, and the vehicle sometimes needs to be able to reverse. Therefore, the reverse gear set in the gearbox is usually used to realize the reverse drive.(3) interrupt power transmission. When the engine starts, idles, the vehicle changes gears or needs to stop to output power, interrupt power transmission to the driving wheel.(4) in order to reach neutral, when the clutch engagement, transmission can not output power. For example, when the engine is not shut down, it can ensure that the driver releases the clutch pedal to leave the driver's seat.