随着汽车技术的发展，自动变速箱的类型日益繁多，主要包括传统的AT（液力自动变速箱）、CVT（无级变速箱）和DCT（双离合变速箱）。它们的内部结构截然不同，因此在维修时的侧重点和常见故障也大相径庭。

With the development of automotive technology, the types of automatic transmissions are becoming increasingly diverse, mainly including traditional AT (hydraulic automatic transmission), CVT (continuously variable transmission), and DCT (dual clutch transmission). Their internal structures are completely different, so the focus and common faults during maintenance are also vastly different.

对于AT变速箱，其核心在于复杂的液压控制系统和行星齿轮组。维修时，液压阀体的清洗与修复、电磁阀的测试以及液力变矩器的锁止离合器检查是重中之重。阀体内部的滑阀如果因杂质卡滞，会直接导致换挡冲击或延迟。

For AT gearbox, its core lies in the complex hydraulic control system and planetary gear set. During maintenance, cleaning and repairing the hydraulic valve body, testing the solenoid valve, and inspecting the lock up clutch of the hydraulic torque converter are of utmost importance. If the spool valve inside the valve body is stuck due to impurities, it will directly cause shifting shock or delay.

对于CVT变速箱，其依靠钢带或链条与锥轮之间的摩擦力来传递动力。这类变速箱对驾驶习惯极为敏感，极度害怕暴力驾驶和承受大扭矩。维修时，重点在于检查压力缸的磨损情况、钢带的拉伸与磨损程度，以及油泵的供油压力。一旦钢带打滑产生大量铁屑，往往需要更换整套传动组件。

For CVT gearbox, it relies on the friction between the steel strip or chain and the bevel wheel to transmit power. This type of gearbox is extremely sensitive to driving habits, and is extremely afraid of violent driving and high torque. When repairing, the focus is on checking the wear of the pressure cylinder, the tension and wear degree of the steel strip, and the oil supply pressure of the oil pump. Once the steel strip slips and produces a large amount of iron filings, it is often necessary to replace the entire transmission component.

对于DCT双离合变速箱，其结构更接近于两套手动变速箱的结合。由于离合器片直接暴露或浸泡在油液中，频繁换挡带来的高温是其主要杀手。维修时，双离合器模块的磨损更换、机电控制单元（阀体）的故障排查是高频项目。特别是干式双离合，其散热问题更为突出，维修时需特别注意离合器片的烧蚀情况。因此，选择具备针对特定变速箱专修能力的机构，是保障维修质量的关键。

For DCT dual clutch transmission, its structure is closer to the combination of two sets of manual transmissions. Due to the direct exposure or immersion of clutch plates in oil, the high temperature caused by frequent gear shifts is their main killer. During maintenance, the replacement of worn dual clutch modules and troubleshooting of mechanical and electrical control units (valve bodies) are high-frequency tasks. Especially for dry dual clutch, the heat dissipation problem is more prominent, and special attention should be paid to the burning of the clutch plates during maintenance. Therefore, choosing an organization with specialized repair capabilities for specific transmissions is the key to ensuring the quality of maintenance.

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