The performance of the automatic transmission oil is very important to the transmission. The gears bite each other and transmit the engine output power after changing the speed ratio. It needs to transfer huge torque between the gears. Therefore, it needs gear oil to lubricate and cool the gears. So it is very important for the maintenance of the lubrication system of the gearbox in daily life. Because of the complex working conditions, high speed and high contact pressure between gears and gears, the lubricant in gearbox plays an important role in the use of gearbox. First, after a certain number of kilometers or long-distance driving back, in addition to the normal maintenance of the engine, it is necessary to check whether there is oil leakage in the gearbox. Once it is found that there are oil leakage and oil leakage in the maintenance of professional automatic gearbox, it is necessary to immediately identify the causes and check the maintenance.

　　因为变速箱内机油是通过齿轮之间相互咬合，将变速箱底部机油带起飞溅到各个齿轮表面上去的，所以机油才能附着在齿轮表面上，形成一层保护油膜，以保证各个齿轮之间的良好润滑，如果变速箱内机油低于正常范围，就无法通过齿轮旋转将机油飞溅到各个齿轮表面，由于失去油膜保护，齿轮高速旋转，这时金属表面产生巨大热量，很容易就会把齿轮表面磨坏，严重时还会把齿轮表面烧蚀，使齿轮无法旋转。其次，变速箱内的润滑油也是要定期更换的，它使用的虽然也是机油，也存在氧化和变质等问题，由于变速箱内的温度要高于常温，润滑油会被氧化，在温度高时润滑油粘稠度降低，会变的很稀，它的吸附能力也会随之降低，特别是对于一些老旧车辆而言，定期更换是关重要的。

　　Because the oil in the gearbox splashes the oil belt at the bottom of the gearbox onto the surface of the gears by biting each other, the oil can be attached to the surface of the gears and form a protective film to ensure good lubrication between the gears. If the oil in the gearbox is below the normal range, it can not splash the oil into the gears by gear rotation. Surface, because of the loss of oil film protection, the gear rotates at high speed. At this time, the metal surface produces huge heat. It is easy to wear out the gear surface. In serious cases, the gear surface will be ablated, so that the gear can not rotate. Secondly, the lubricating oil in the gearbox should be replaced regularly. Although it uses engine oil, it also has some 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, which will become very thin, and its adsorption capacity will also be reduced, especially for some old vehicles, periodically more. Change is crucial.

　　要做到正确使用和维护变速箱，我们必须先了解一下变速箱里都有哪些部件，它们是怎样工作的。对于一款手动变速箱来说，在内部有两根主轴，一根为输入轴，通常我们把它称为一轴，它通过离合器与发动机相连，并将发动机输出的动力引入变速箱内，并通过二轴也就是输出轴将动力传递出去，在一轴和二轴上有许多不同大小的齿轮，一轴上的齿轮是主动齿轮，动力来自发动机，并与发动机的转速同步，二轴上的齿轮是从动齿轮，它与车速是同步的，主动齿轮和从动齿轮之间相互咬合，并带动二轴的从动齿轮一起旋转，较后将发动机的输出动力传递给汽车的驱动轮上。在变速箱内还有一个重要的部件就是同步器了，它对于换挡的平顺性和换挡速度起着重要的作用。
                                  

　　To use and maintain the gearbox correctly, we must first understand what parts are in the gearbox and how they work. For a manual gearbox, there are two main axles inside, one is the input axle. Usually we call it a shaft. It connects with the engine through clutch, and introduces the power output from the engine into the gearbox, and transfers the power through two axles, that is, the output axle. There are many different sizes of gears on one and two axles. The gear on one axle is the driving tooth. Wheels, power from the engine, and synchronized with the engine speed, the two-axle gear is driven gear, it is synchronized with the speed of the car, the driving gear and driven gear bite each other, and drive the two-axle driven gear to rotate together, and finally the output power of the engine is transmitted to the driving wheel of the car. Synchronizer is another important part in the gearbox, which plays an important role in the smoothness and speed of shift.

　　现代变速箱内的齿轮都是斜齿设计，斜齿与斜齿之间是长咬合状态，这样就可以减轻齿轮在运转时的噪音，在斜齿的内侧还设计了一个直齿，并在两个斜齿中间的轴上有花键，花键上有一个同步器环，在同步器环的两边有棘齿可在花键上左右滑动，通过左右滑动同步器环使环上棘齿的锥形缺口正好与斜齿内侧直齿的锥形突出相互咬合，在咬合前两边各有几组锥面的金属磨擦片，靠磨擦片的磨擦来实现齿轮与齿轮的同步，减轻换挡时打齿现象的发生。

　　The gears in modern gearbox are all helical teeth. The long occlusion between helical teeth and helical teeth can reduce the noise of gears in operation. A straight tooth is also designed on the inner side of helical teeth. There is a spline on the shaft between the two helical teeth. There is a synchronizer ring on the spline. The ratchets on both sides of the synchronizer ring can slide left and right on the spline, and the same can be achieved by sliding left and right. The step ring makes the conical notch of the ratchet on the ring coincide with the conical protrusion of the straight teeth on the inside of the helical teeth. There are several sets of metal friction plates on the two sides of the ring before and after the biting. The friction of the friction plates is used to realize the synchronization between the gear and the gear and reduce the occurrence of tooth beating during gear shifting.

　　不同的变速箱油对于自动变速箱维修的性能也会带来不同的影响。一般来说，手动变速箱的润滑油粘度较高，因为它需要较好的吸附性。但粘度过高的润滑油会加大变速箱中部件的运转阻力，因此选用粘度更稀的润滑油有利于降低这些阻力。因此两者时矛盾的，但高品质的全合成齿轮油能做到两者性能的兼顾。 化也细分化是市场和行业发展的必然，这样才能够给客户提供更好的服务。

　　Different transmission oils have different effects on the performance of professional automatic transmission maintenance. Generally speaking, the lubricant viscosity of manual gearbox is higher, because it needs better adsorption. But the high viscosity lubricant will increase the resistance of the parts in the gearbox, so choosing the thinner viscosity lubricant will help to reduce these resistance. Therefore, the two are contradictory, but the high quality fully synthetic gear oil can achieve both performance. Specialization and subdivision are inevitable for the development of market and industry, in order to provide better services to customers.