How to use and maintain the hottest manual gearbox

2022-09-22
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How to use and maintain manual transmission in daily life

in the power assembly of the car, the transmission plays a very important role. It transmits the power output by the engine to the transmission through the clutch, changes the appropriate speed ratio through the transmission, and then redistributes it to the driving wheel of the car. Since the gearbox occupies such a position in the power system of a car, its quality can directly affect our driving comfort and handling. How can we take care of the gearbox of our car in daily use and prolong its service life

to correctly use and maintain the gearbox, we must first understand what components are in the gearbox and how they work. For a manual gearbox, there are two main shafts inside, one is the input shaft, which is usually called the first shaft. It is connected with the engine through the clutch, and the power output by the engine is introduced into the gearbox, and the power is transmitted through the second shaft, that is, the output shaft. There are many gears of different sizes on the first and second shafts. The gear on the first shaft is the driving gear, and the power comes from the engine, It is synchronized with the speed of the engine. The gear on the second shaft is the driven gear, which is synchronized with the vehicle speed. The driving gear and the driven gear engage with each other and drive the driven gear of the second shaft to rotate together. Finally, the output power of the engine is transmitted to the driving wheel of the car. Another important component in the gearbox is the synchronizer, which plays an important role in the smoothness and speed of shifting. The gears in modern gearboxes are designed with helical teeth, and the helical teeth are in a long meshing state, which can reduce the noise when the gear is running at a specified speed. A straight tooth is also designed on the inner side of the helical teeth, and there is a spline on the shaft between the two helical teeth. There is a synchronizer ring on the spline, and there are ratchets on both sides of the synchronizer ring, which can slide left and right on the spline, By sliding the synchronizer ring left and right, the conical notch of the ratchet on the ring is just engaged with the conical protrusion of the straight tooth inside the helical tooth. Before engaging, there are several groups of metal friction plates with conical surfaces on both sides. The synchronization of the gear and the gear is realized by the friction of the friction plates, so as to reduce the occurrence of gear shifting

the performance of transmission oil is very important to the transmission, And it must also be regularly "Relevant national departments take the lead in formulating relevant standards, laws and regulations for replacement. The mutual engagement of gear inspection will transmit the output power of the engine after changing the speed ratio. Huge torque needs to be transmitted between the gears, so gear oil is needed to lubricate and cool the gears, so it is very important to maintain the lubrication system of the gearbox in daily life. Due to the complex working conditions, the speed of the gears in the gearbox is low." High, high contact pressure on the meshing contact surface between gears, etc., so the lubricating oil in the gearbox plays an important role in the use of the gearbox. First, after driving a certain number of kilometers or returning from a long-distance drive, in addition to the normal maintenance of the engine, check whether the transmission has oil leakage. Once the transmission has oil leakage and oil leakage, immediately find out the cause and timely check and repair. Because the oil in the gearbox is meshed with each other through the gears, the oil at the bottom of the gearbox will take off and splash onto the surface of each gear, so the oil can be attached to the gear surface and form a protective oil film to ensure good lubrication between the gears. If the oil in the gearbox is below the normal range, the oil cannot be splashed onto the surface of each gear through the rotation of the gear. Due to the loss of oil film protection, When the gear rotates at high speed, huge heat is generated on the metal surface, which will easily wear out the gear surface. In serious cases, the gear surface will be ablated, making the gear unable to rotate. Secondly, the lubricating oil in the gearbox also needs to be replaced regularly. Although it uses engine oil, it also has problems such as oxidation and deterioration. Because the temperature in the gearbox is higher than normal temperature, the lubricating oil will be oxidized. When the temperature is high, the viscosity of the lubricating oil will be reduced, it will become very thin, and its adsorption capacity will also be reduced, especially for some old vehicles, regular replacement is very important

in addition, different transmission oils will also have different effects on the performance of the transmission. Generally speaking, the lubricating oil viscosity of manual transmission is high, because it needs better adsorption. However, lubricating oil with too high viscosity will increase the running resistance of components in the gearbox, so choosing lubricating oil with thinner viscosity is conducive to reducing these resistance. Therefore, the two are contradictory, but high-quality synthetic gear oil can achieve both performance

gear tapping is the act of destroying the gearbox. We should try our best to avoid gear tapping when in gear. When the vehicle is driving and shifting gears, sometimes you can hear the clicking sound. This sound mainly comes from the metal impact sound made by the ratchets on both sides of the synchronizer ring and the straight teeth inside the oblique teeth when they are engaged. If the phenomenon of frequent toothing occurs for a long time, the brief introduction of the test data transmission system will damage the ratchet on the synchronizer ring. Many people try to save trouble when shifting gears. They shift gears before they step on the lead screw drive and rack drive, which will lead to incomplete clutch separation, that is, the power between the first shaft and the engine is not completely cut off

damage to the synchronizer ring in the gearbox will also cause gear beating. There is a conical friction plate on the synchronizer, and its principle is somewhat similar to the diaphragm clutch. It relies on the sliding friction between the metal plates to achieve the synchronization of speed. If the conical friction plate is damaged, or the performance of the conical surface itself is poor, a relatively large speed difference will be formed between the gears in the process of upshift or downshift, resulting in gear tapping due to the lack of flexible connection of the metal friction plate. When there is slight gear beating, we can pause a little before entering the gear to let the synchronizer have a reaction time to reduce the speed difference between the gears, but when there is more frequent gear beating or loud gear beating, we need to go to the maintenance station for inspection

directly engaging the reverse gear without stopping the car stably will also cause tooth beating. Most models have no synchronizer for reverse gear, and gears are switched through straight teeth. When we engage in reverse gear everyday, we usually park the car stably and then engage. When we step on the clutch, the first shaft will be disconnected from the engine power. Before, the speed of the first shaft is very low, and the first shaft will soon stop rotating after disconnection. At this time, the second shaft is stationary, so there is no speed difference between the input shaft and the output shaft, so it is easier to engage in reverse gear and there will be no chattering sound

in daily driving, many drivers' incorrect operation will also cause unnecessary damage to the gearbox. We should understand the gearbox and treat it well, so that the gearbox can serve us better and longer. For example, when we don't need to shift gears, we hold our hands on the gear lever. In the long run, the pressure of our hands is transmitted to the gears in the gearbox through the shift fork of the gear lever, which will cause gear wear. In addition, when learning to drive in the driving school, the master requires that for cars without synchronizer, a foot of oil should be blasted when downshifting, so as to improve the speed of the input shaft and reduce the speed difference between the input shaft and the output shaft, so that it is easier to shift gears and avoid gear beating

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