What is Semi Automatic Gear? What Are The Differences With Fully Automatic Gear?

Anyone who likes to drive or needs to drive because of their job or necessity knows that the gearbox is divided into manual and automatic gearboxes. Automatic transmission vehicles, which are becoming more popular due to the comfort they offer, are also divided into two: Fully automatic transmission and semi-automatic gearbox. If you've ever thought these were the same thing, you'd be wrong.


In this content, "What is a semi-automatic gear?" We will answer the question and explain the differences between semi-automatic transmission and fully automatic transmission. We'll also talk about the advantages and disadvantages of semi-automatic transmission in our content. Let's start without further ado.

What is a semi-automatic transmission?

Before answering this question, let's first answer the question of 'what is gear' in order to explain the subject more clearly. Simply put, a gear, gearbox or gearbox is the mechanism that regulates how much power is delivered in the process of transferring the power transmitted to the car's engine to the wheels. The power transferred to the wheels changes each time the gear is shifted. This process is done by the driver in manual gear vehicles and by the mechanisms referred to as robots in automatic transmission vehicles.

Clutch is needed to change gear. In manual geared vehicles, the leftmost pedal is the clutch pedal, and it is the rule that the driver changes gear by pressing this pedal. The first difference of vehicles with automatic transmission emerges here: Automatic transmission vehicles do not have a clutch pedal under the control of the driver and the vehicle naturally keeps the clutch ready.

Semi-automatic gearboxes have a gearbox structure identical to those with manual gearboxes. The difference of these two-speed vehicles, which have a one-to-one pressure lining system, is that semi-automatic vehicles do not have a clutch pedal. Gear robots provide gear shifts in semi-automatic geared vehicles, which operate as a one-to-one manual geared vehicle and whose fuel consumption and performance are almost identical to manual gear vehicles.

How is semi-automatic gear different from others?

One of the biggest differences of the semi-automatic gear is that it can control the gear itself according to the driver's request. How so? Let's explain right away. We said that the gear mechanism in semi-automatic vehicles is actually the same as in manual transmission vehicles. Only the clutch works automatically in these vehicles. With his help, the driver can control the gear of the car himself by choosing between automatic and manual gear.

You can see the letters P (Park), N (Neutral), R (Reverse), D (Driving) and M (Manual / Manual) on the side or above the gear of semi-automatic vehicles. When you shift the gear to D position, the vehicle now starts shifting gears automatically. When the gear is in the M position, the driver can control the gear as he wishes. Of course, after the required section is passed, if the driver does not shift his own gear, the vehicle will intervene and change gear automatically.

What is a dual clutch transmission?

In single clutch automatic gearboxes, gear structure is identical to manual gearboxes. Gear shifts can be felt more. Since all gears of the vehicle will pass depending on this clutch in this arrangement with a single pressure lining, sometimes there may be disruptions and tabs. The gear structure of double clutch gearboxes is identical to manual gearboxes, but the gear change takes place differently.

Double clutch gearboxes have double pressure lining. In this type of gearbox, the first pressure lining is responsible for switching to the first, third, fifth and seventh gears, while the second pressure lining is responsible for switching to the second, fourth, sixth and eighth gears. This is why gear shifts are less felt in double clutch gearboxes.

We can summarize the working principle as follows: The first pressure lining releases the clutch after enabling you to shift the vehicle to 1st gear. In single-clutch gearboxes, this pad engages the clutch again when shifting to 2nd gear, so gear shifts are felt more, but in double-clutch vehicles, this feeling is much less because the second-pressure lining clutch is active. Just like when the vehicle is in 2nd gear, the first pressure lining prepares the vehicle for the 3rd gear and the clutch is ready.

Semi-automatic gear advantages and disadvantages:

  • Advantages:
    • It consumes less fuel because it has a one-to-one structure with a manual gear,
    • Its performance is close to manual gearboxes,
    • It is very comfortable in daily use,
    • Gear shifts are almost not felt in double clutch semi-automatic gears,
    • The gear can be changed according to the driver's request,
  • Disadvantages:
    • Gear shifts can be felt much more in single clutch semi-automatic gears,
    • Semi-automatic geared vehicles without hill start assist shift on the slope,
    • Sales prices are more valuable than manual gear vehicles,
    • The clutch system can be worn more easily in single clutch semi-automatic gears.

The semi-automatic transmission may seem more advantageous, as it incorporates the basic basics of both manual and fully automatic transmission. Many manufacturers prefer this gearbox, especially since gear shifts are not felt much in double clutch semi-automatic transmissions. A feature that is fully automatic but not semi-automatic, the default anti-scrolling feature on the slope. If the vehicle does not have a take-off support, semi-automatic vehicles can scroll on slopes. There is no such situation in fully automatic.

We have come to the end of our content where we answer the question of what is a semi-automatic gear, explain the differences in the middle of a fully automatic gear, and compile the advantages and disadvantages of this gear compared to others. Which gearbox type do you prefer? You can share with us in the comments section. So, stay tuned in order not to miss the continuation of our content.



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