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.

　　因為變速箱內機油是通過齒輪之間相互咬合，將變速箱底部機油帶起飛濺到各個齒輪表面上去的，所以機油才能附著在齒輪表面上，形成一層保護油膜，以保證各個齒輪之間的良好潤滑，如果變速箱內機油低于正常范圍，就無法通過齒輪旋轉將機油飛濺到各個齒輪表面，由于失去油膜保護，齒輪高速旋轉，這時金屬表面產生巨大熱量，很容易就會把齒輪表面磨壞，嚴重時還會把齒輪表面燒蝕，使齒輪無法旋轉。其次，變速箱內的潤滑油也是要定期更換的，它使用的雖然也是機油，也存在氧化和變質等問題，由于變速箱內的溫度要高于常溫，潤滑油會被氧化，在溫度高時潤滑油粘稠度降低，會變的很稀，它的吸附能力也會隨之降低，特別是對于一些老舊車輛而言，定期更換是至關重要的。

　　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.

　　要做到正確使用和維護變速箱，首先我們必須先了解一下變速箱里都有哪些部件，它們是怎樣工作的。對于一款手動變速箱來說，在內部有兩根主軸，一根為輸入軸，通常我們把它稱為一軸，它通過離合器與發動機相連，并將發動機輸出的動力引入變速箱內，并通過二軸也就是輸出軸將動力傳遞出去，在一軸和二軸上有許多不同大小的齒輪，一軸上的齒輪是主動齒輪，動力來自發動機，并與發動機的轉速同步，二軸上的齒輪是從動齒輪，它與車速是同步的，主動齒輪和從動齒輪之間相互咬合，并帶動二軸的從動齒輪一起旋轉，較后將發動機的輸出動力傳遞給汽車的驅動輪上。在變速箱內還有一個重要的部件就是同步器了，它對于換擋的平順性和換擋速度起著重要的作用。
                                  

　　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.

　　現代變速箱內的齒輪都是斜齒設計，斜齒與斜齒之間是長咬合狀態，這樣就可以減輕齒輪在運轉時的噪音，在斜齒的內側還設計了一個直齒，并在兩個斜齒中間的軸上有花鍵，花鍵上有一個同步器環，在同步器環的兩邊有棘齒可在花鍵上左右滑動，通過左右滑動同步器環使環上棘齒的錐形缺口正好與斜齒內側直齒的錐形突出相互咬合，在咬合前兩邊各有幾組錐面的金屬磨擦片，靠磨擦片的磨擦來實現齒輪與齒輪的同步，減輕換擋時打齒現象的發生。

　　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.

　　不同的變速箱油對于自動變速箱維修的性能也會帶來不同的影響。一般來說，手動變速箱的潤滑油粘度較高，因為它需要較好的吸附性。但粘度過高的潤滑油會加大變速箱中部件的運轉阻力，因此選用粘度更稀的潤滑油有利于降低這些阻力。因此兩者時矛盾的，但高品質的全合成齒輪油能做到兩者性能的兼顧。 化也細分化是市場和行業發展的必然，這樣才能夠給客戶提供更好的服務。

　　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.