【除了“手动”和“自动”之外：变速箱总共有6种不同的类型】

1. 手动变速箱 (MT)
也称为手动变速杆，这是最传统的变速箱形式。驾驶员需要手动踩下离合器踏板，将发动机与变速箱断开，同时移动换挡杆选择所需的挡位。

优点：驾驶乐趣高，机械结构简单，维护成本通常较低。

缺点：学习曲线陡峭，在拥堵的走走停停的交通状况下容易疲劳。

2. 自动变速箱 (AT)
通常被称为液力变矩器自动变速箱，该系统使用液力耦合器（液力变矩器）代替离合器。它利用复杂的行星齿轮系统和液压自动完成换挡。

优点：动力输出极其平顺，操作非常简便。

缺点：传统上燃油效率低于手动变速箱（尽管现代的8速或10速版本已经缩小了这一差距）。

3. 无级变速箱 (CVT)
与其他变速箱不同，CVT变速箱……它没有传统意义上的“齿轮”。它采用皮带和滑轮系统，可以无限改变直径，从而提供无缝的传动比范围。

优点：始终使发动机保持在最高效的动力输出范围内，从而实现出色的燃油经济性。

缺点：可能会产生“嗡嗡”的发动机噪音，并且通常缺乏许多驾驶员所喜欢的“换挡”感觉。

4. 双离合变速器 (DCT)
DCT 本质上是将两个手动变速箱合二为一。一个离合器负责奇数挡位（1、3、5挡），另一个离合器负责偶数挡位（2、4、6挡）。当您处于2挡时，另一个离合器已经“预选”了3挡，从而实现闪电般的换挡速度。

优点：换挡速度比人手操作更快；兼具手动变速箱的效率和自动变速箱的便捷性。

缺点：在极低速行驶时（例如在拥堵路段缓慢行驶），可能会感觉顿挫。而且维修费用昂贵。

5. 自动手动变速器 (AMT)
从机械结构上看，AMT 与手动变速箱几乎相同，但离合器和换挡由电脑和执行器控制，而不是由驾驶员的脚和手操作。

优点：与传统自动变速器相比，AMT 的制造成本更低，通常燃油经济性更好。

缺点：与现代液力变矩器或双离合变速器 (DCT) 相比，换挡可能会感觉“顿挫”或缓慢。

6. 顺序式手动变速器 (SMT)
与使用“H 型”换挡模式（可以直接从 2 挡换到 4 挡）的标准手动变速器不同，顺序式变速器强制您按照严格的顺序换挡：1-2-3-4-5-6。您可以通过向后拉动换挡杆升挡或向前推动换挡杆（或使用拨片）来换挡。

优点：换挡速度极快（毫秒级），不可能“错过”挡位或意外从 2 挡跳到 5 挡，并且非常紧凑。

缺点：噪音很大（通常使用会发出刺耳啸叫声的“直齿轮”），不适合日常驾驶，而且比公路行驶的自动变速箱需要更频繁地进行大修。
Beyond "Manual" vs. "Automatic: there are total 6 different transmissions!

1. Manual Transmission (MT)
Also known as a stick shift, this is the most traditional form. It requires the driver to manually engage a clutch pedal to disconnect the engine from the gearbox while moving a gear lever to select the desired ratio.

Pros: High driver engagement, mechanically simple, and typically lower maintenance costs.

Cons: Steep learning curve and can be tiring in heavy stop-and-go traffic.

2. Automatic Transmission (AT)
Often called a torque converter automatic, this system uses a hydraulic fluid coupling (the torque converter) instead of a clutch. It manages gear changes automatically using a complex system of planetary gears and hydraulic pressure.

Pros: Extremely smooth power delivery and very easy to operate.

Cons: Traditionally less fuel-efficient than manuals (though modern 8- to 10-speed versions have closed this gap).

3. Continuously Variable Transmission (CVT)
Unlike other transmissions, a CVT doesn't have "gears" in the traditional sense. It uses a system of belts and pulleys that can change diameters infinitely, providing a seamless range of ratios.

Pros: Keeps the engine in its most efficient power band at all times, leading to excellent fuel economy.

Cons: Can produce a "droning" engine sound and often lacks the "shifting" feel many drivers enjoy.

4. Dual-Clutch Transmission (DCT)
A DCT is essentially two manual gearboxes in one. One clutch handles odd-numbered gears (1, 3, 5) while the other handles even gears (2, 4, 6). While you are in 2nd gear, the 3rd gear is already "pre-selected" by the other clutch, allowing for lightning-fast shifts.

Pros: Faster shifts than a human can manage; combines the efficiency of a manual with the ease of an automatic.

Cons: Can feel "jerky" at very low speeds (like crawling in traffic) and is expensive to repair.

5. Automated Manual Transmission (AMT)
Mechanically, an AMT is almost identical to a manual gearbox, but the clutch and gear shifts are operated by computers and actuators rather than the driver’s foot and hand.

Pros: Cheaper for manufacturers to build than a traditional automatic, often providing better fuel economy.

Cons: Shifts can feel "lurchy" or slow compared to modern torque converters or DCTs.

6. Sequential Manual Transmission (SMT)
Unlike a standard manual that uses an "H-pattern" (where you can move from 2nd directly to 4th), a sequential gearbox forces you to move through gears in a strict order: 1-2-3-4-5-6. You shift by pulling a lever back to go up or pushing it forward to go down (or via paddles).

Pros: Blisteringly fast shifts (milliseconds), impossible to "miss" a gear or accidentally skip from 2nd to 5th, and very compact.

Cons: Very noisy (often uses "straight-cut" gears that whine loudly), harsh for daily driving, and requires more frequent rebuilds than a road-going automatic. http://t.cn/AXqZODEO