What are the internal structures of an automatic transmission?

[VonPiper]

Automatic transmission internal structures include: torque converter, planetary gear transmission mechanism, hydraulic control system, and oil filter. An automatic transmission is a gear-shifting device that can automatically shift gears based on the vehicle's speed and engine RPM, as opposed to a manual transmission. It mainly consists of four types: hydraulic automatic transmission, mechanical continuously variable automatic transmission, electronically controlled mechanical automatic transmission, and dual-clutch automatic transmission. The automatic transmission uses planetary gear mechanisms for shifting, automatically adjusting gears according to the degree of throttle pedal and changes in vehicle speed. The driver only needs to operate the accelerator pedal to control the speed.

[Roberto]

I've been in the auto repair industry for over a decade and have disassembled many automatic transmissions—there's quite a lot to them. At its core, there's the torque converter connecting to the engine, which cushions power surges and makes acceleration smoother. The planetary gearset shifts gears through the combination of several small wheels, like a precision puzzle. The hydraulic system, driven by an oil pump, operates the valve body to control the engagement of clutches and brake bands, enabling different gear changes. The electronic control module might sound high-tech, but it's essentially the 'brain' that makes automatic decisions based on speed and throttle input. For maintenance, low or dirty transmission fluid can cause slipping or jerking, so regular checks and fluid changes can prevent minor issues from turning into major repairs. My advice is to get it inspected every few tens of thousands of kilometers—don't wait until strange noises appear to address it.

[ElainaDella]

I've been driving an automatic transmission car for five years and have studied its internal structure in detail. The torque converter inside is a fluid-filled chamber that absorbs engine vibrations and transmits them to the wheels; the planetary gear set is ingeniously designed, with a small sun gear externally meshing with several planet gears, changing gear ratios during shifts; the hydraulic system uses oil pressure to actuate valve bodies, engaging clutches and brake bands; the electronic control unit monitors sensor data to precisely control shifting. If you experience jerking or slow shifting while driving, common issues include clogged oil passages or worn valve bodies; remember to check oil quality and levels every two years—a small investment to avoid big troubles. This structure makes daily driving much easier and full of technological sophistication.

[KylieFitz]

I'm a car enthusiast, and the internal design of automatic transmissions is fascinating. The torque converter acts as a buffer to reduce engine load, while the planetary gear sets combine to create multiple speed ratios. The hydraulic system includes a valve body that controls oil flow to operate clutches and brake bands, and the electronic control module uses algorithms to optimize shift points. Compared to manual transmissions, the internal structure lacks a clutch pedal mechanism but includes an oil pump to ensure lubrication. In terms of trends, more and more models are adopting electronic shifting technology, improving efficiency and response speed. For minor issues like high oil temperature, simply check the cooling system—maintenance is straightforward and deserves praise.

[SanMolly]

I just started using a car not long ago and figured out the internals of an automatic transmission by researching. It mainly consists of a torque converter linking the power source, planetary gear sets responsible for shifting changes, a hydraulic system regulating operating components via an oil pump and valve body, and an electronic module for intelligent coordination. Clutches and brake bands act like switches to engage and disengage gears, and lack of oil can easily cause friction noise; if you feel delayed response while driving, there might be internal wear. I learned to check the oil level and inspect for contamination myself—even beginners can handle basic maintenance. This structure makes driving hassle-free, perfect for city commuting.