What Is DCT Gearbox

Dual Clutch Transmission

Here is the complete guide about DCT (Dual Clutch Transmission) Gearbox. Here we provide DCT Gearbox Working, Problems, Advantages and Disadvantages ect.

In car and truck applications,the DCT (Dual Clutch Transmission) functions as an automatic transmission, requiring no driver input to change gears. The first DCT to reach production was the Easidrive automatic transmission introduced on the 1961 Hillman Minx mid-size car. … The first Dual Clutch Transmission of the modern era was used in the 2003 Volkswagen Golf R32.

DCT Gearbox

With its multiple clutches, shafts, and gears, Dual Clutch Transmission might be one of the extra complicated transmission systems. It gives each high-pace gear shifts along the performance equal to a guide transmission Dual Clutch Transmission has been slowly growing in the Indian market. Given different names by different companies using it, Dual Clutch Transmission is the basic names it’s known by. Volkswagen calls it DSG, Porsche PDK.

Dual Clutch Transmission in simple terms can be described as two manual transmissions that are automatically controlled. The working is far more intricate so let’s get to it.

DCT Gearbox Working

DCT in simple terms can be described as two manual transmissions that are automatically controlled. The working is far more intricate so let’s get to it.

As the name suggests the gearbox has two clutches that control even and an odd set of gears respectively (clutch 1 controlling 1,3,5 gears and clutch 2 controlling 2,4,6 gears). Just like the clutches it also has two transmission shafts which as you might have guessed are for even and odd-numbered gears. 

Housing has the two clutches that we discussed and alongside the clutches, it has two transmission shafts that the clutches are connected to. To make it a bit easier let’s call it the shaft A and B. So clutch 1 is connected to Shaft A thus controlling 1,3 and 5 gear similarly B connected to clutch 2 controls 2,3,5.
Now the clutch decides which gear is engaged by pushing along the shaft in which the necessary gear is present. Smaller clutches on each gear called dog or collar clutches to ensure the gear required is active.
The complete explanation is not covered as it is quite big and out of scope for the current topic at hand.


  • The purpose behind a DCT is to lessen the distance among gear shifts to a minimum, with the blessings being progressed overall performance and gas efficiency.
  • The much less time spent off the strength converting equipment in the course of acceleration the quicker the car can accelerate – and with the aid of using lowering the time spent off the strength in the course of equipment adjustments in general, the higher gas economy might be as engine strength isn’t wasted.
  • Gear changes on DCTs can now be measured withinside the milliseconds, quicker than any driver is capable of, and nonetheless preserve the advantages a manual gearbox has over an automatic.
  • How it achieves those lightning speedy adjustments is with the aid of using looking forward to what the following equipment wanted might be, primarily based totally on elements including fee of acceleration or deceleration, modern velocity of tour and engine velocity.
  • This allows the computer to have the predicted gear already engaged earlier than the change is made.


  • High costs for DCT systems due to the complexity and the number of parts involved.
  • Another disadvantage of the number of parts involved is the cost of repair and maintenance.


The machine does run into problems when going from desk bound to very gradual speeds, in which there’s a put off in enticing first gear but the driver continues to be miserable the accelerator expecting energy delivery. Once the machine catches up and the gear is engaged, the automobile will then boost up in line with how speedy the engine velocity is – and if the driver has given it an excessive amount of energy it could reason the automobile to shoot forwards unexpectedly.

This problem can be largely attributed to unfamiliarity with the system, but other complaints are more directly related to its mechanical processes – although this is usually relevant for earlier model DCT/DSGs.

How Is a DCT Different to an Automatic Transmission?

A dual clutch transmission looks very similar to an automatic transmission cockpit, this is where the similarities end. In fact, a DCT has more in common with a manual transmission than it does with an automatic transmission. One of the main advantages of a dual-clutch transmission is its economical fuel saving benefits. As the flow of power from the engine is not disrupted, the rate of fuel efficiency increases.

It is estimated that a 6-speed dual-clutch transmission is able to increase fuel efficiency by approximately 10% compared with a standard 5 speed automatic transmission. Generally speaking, this is because a torque converter in a typical automatic transmission is designed to slip, so not all of the engine’s power is being transferred to the driveline all of the time, particularly while accelerating.


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