What is a torque-converter gearbox?

If you are looking at automatic vehicles in professional auctions, you have probably come across the term torque converter. This component is key in many traditional automatic transmissions and delivers smooth, comfortable driving, ideal for certain types of used vehicles. In this article we explain how it works, its advantages and disadvantages, and what you should keep in mind if you plan to buy a car with this type of gearbox on Veiko.

What is a torque converter in an automatic transmission?

An automatic gearbox with a torque converter uses a hydraulic system instead of a mechanical clutch to transmit power from the engine to the wheels. That allows gear changes to be automatic and fluid, without the driver having to intervene.

Main parts of the torque converter

The torque converter is made up of three elements:

• Pump: Connected to the engine, it drives the oil under pressure.
• Turbine: Receives the fluid and transmits the movement to the gearbox.
• Stator: Redirects the oil flow to improve the efficiency of the assembly.

Differences versus other automatic transmissions

Unlike a dual-clutch gearbox or a CVT, the torque converter is based on the movement of a fluid, which offers a smoother response, but sometimes a less immediate one. It is a widely used technology because of its robustness and reliability.

How does a torque-converter gearbox work?

When the engine turns, it drives the converter pump, which sets the oil inside in motion. This fluid hits the turbine, making it turn and transmit the movement to the gearbox. It is a continuous process, with no need to operate a clutch.

Power transmission through the fluid

The oil acts as an intermediary between the engine and the transmission. Although this generates small energy losses, it allows very smooth driving, ideal in the city and in slow manoeuvres.

The role of the lock-up clutch

At medium or high speeds, a lock-up clutch is activated that joins the pump and the turbine directly, eliminating fluid slip. This improves efficiency and reduces consumption on the road.

When it is more efficient

This type of transmission shows its best performance on mixed or long journeys, where the lock-up clutch is active most of the time.

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Advantages of torque-converter gearboxes

Smoother driving

The absence of a mechanical clutch allows almost imperceptible gear changes, improving ride comfort.

Comfort in urban traffic

Especially useful in traffic jams or city trips, where you do not need to keep changing gear all the time.

Greater reliability and durability

These systems are more robust and less prone to mechanical faults, especially if basic hydraulic-oil maintenance is carried out.

Disadvantages of this type of automatic transmission

Fuel consumption

Compared with a manual transmission, consumption is usually higher, especially in the city.

Slower response

There can be a certain delay when you accelerate hard, because of the hydraulic operation of the system.

Lower efficiency versus other gearboxes

Compared with options such as dual-clutch gearboxes, the torque converter loses some efficiency, although it makes up for it with smoothness and reliability.

Things to consider when buying at a professional auction

If you are taking part in an auction on Veiko, make sure you check the vehicle specifications. Many automatic cars include a torque converter as their transmission system. It is ideal if you are looking for reliability, smoothness and comfort.

Is it a good option in used cars for professionals?

Yes. If your priority is comfort, smooth driving and mechanical reliability, a torque-converter gearbox is a strong choice. Although it uses a little more fuel than other options, its low maintenance and excellent behaviour in the city make it perfect for many professionals in the sector.

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