Gearbox | Types | Working | definition | parts


Hello, readers and welcome all of you will know in another new post today what is gearbox. Why is it important in automobiles? How many types are there? And how does this work?



What is a gearbox

Any vehicle needs more torque while running from the start, lifting the load or climbing uphill. This is the main reason for installing a gearbox. That can increase the power of the engine ie torque. And the vehicle can be driven according to the road and load in every condition. The engine needs a lot of power to drive a parked car.

And in such a situation the speed of the train is not important. But when a car is moving at a high speed at some level. Then it is better to use the working torque at a higher speed than to apply more torque on the wheels.

The engine is not able to work in such a large speed range. And so in vehicles, a set of wheels is placed between the engine and the wheels, which is called the transmission system or gearbox.


Definition of a Gearbox?

A gearbox is a mechanical device through which the output torque is converted. The gearbox transmits the power coming from the engine to the wheels at different speeds and torques. It is considered to be the main part of power transmission. In this, gears are fixed in different ratios. It receives power from the engine through the clutch and transmits it to the front wheels


Parts or Construction of Gearbox

Let us know which parts are used to make a gearbox. Here we will know in detail about all the parts. The following parts are used to make a gearbox. Clutch shaft and driving shaft. It is commonly called the driving shaft. This clutch or driving shaft is in line with the main shaft. Mounted between the clutch and the gearbox. Power from the engine reaches this shaft through the clutch. In general, this shaft takes power from the engine and other parts. This shaft is connected to the clutch shaft and also a gear is used which connects to the clutch shaft and the main shaft. It can be driven by the engine or engine depending on the gear ratio. This type of shaft is used in the gearbox. The main shaft is also commonly known as the output shaft. It does not rotate at the speed of the engine, but it is used in the gearbox. run according to different gears Due to this it rotates at different speeds and through this shaft, the torque received from the engine is also transmitted further through this shaft.


In a gearbox, the shaft rotates and there is friction, so bearings are used in it. Bearings are used in the main shaft and countershaft.


Gears as the name itself suggest, do you know what is the role of gear in a gearbox? Through gears, power is transmitted from one shaft to another, that too at different speeds to the power of an engine. Transmission as required is done through gears only except the main shaft in the gearbox all other gears are mounted with their own shafts gears determine the amount of torque and acceleration as well as speed

selecting fork

A shifting fork is used to shift the gears in the gearbox. It is designed according to the gearbox. It is mounted on the upper side of the gearbox and engages and disengages from the gears inside the gearbox.


Working Principles of Gear Box

Now you know what are the parts of the gearbox, now let us know what is the working principle of the gearbox. You all know very well that a vehicle is driven according to the requirement, it means that the vehicle is driven according to the load or according to the road. Or more is driven and the vehicle requires different torque on the slope or on the climb. understand

First gear – First gear speed is less and torque is more because a small gear is driving a big gear, so the speed is less but the power is more. Gears are in decreasing order from first to last and the speed is also different. it occurs

The power in the gearbox is transmitted from the engine and the gearbox forwards it according to the condition and the power reaches the wheels of the vehicle.



purpose of a gearbox

The gearbox is designed to transmit power from the engine as required. It also changes the speed of the crankshaft and it connects and disconnects engine power to the wheels so that power and torque can be used as required.




Types of gearboxes

There are many types of gearboxes

manual transmission gearbox

As you all know that manual transmission is a means of transmitting power and it is a type of transmission system, in which manual transmission is used to transmit power from the engine to other parts, for this clutch is used. And the gear lever is used manually to shift the gear. It is also known as the standard transmission. In the changing times, many types of technology have developed like automatic transmission and many other transmissions are used but now Many automakers use manual transmission

This system has been used in the automobile sector for many years. And in modern times, it is also the most popular form of transmission. Power from the engine passes through the transmission system before the wheels.

The main function of the transmission is to control the speed and torque of the wheels at different driving speeds. In this type of system, the gears are shifted manually by a lever.


This gearbox is divided according to the combination of different pairs of gears

sliding mash gearbox
constant mesh gearbox
synchro mash gearbox

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Sliding Mash Gear Box –

This gearbox is in use for a long time. It is quite simple to use. It has three shafts.
input shaft
output shaft

The input shaft and the output shaft are connected through a counter. Power is routed to the output shaft through gears mounted on the countershaft. After this, the output shaft transmits this power to the propeller shaft. Next, this power goes to the wheels. A gear in the input shaft is connected continuously to one of the gears of the countershaft.

The gear on the output shaft is connected to the gear lever on the countershaft. There were some problems in shifting gears in this type of gearbox.


 Constant-mesh Gear Box –

The power system remains the same in this gearbox as well. Power comes to the input shaft through the engine clutch. In this, the gears are mounted on the output shaft. They don’t stay fixed.


On the contrary, Volter is fitted with gears of different ratios mounted on the shaft. which cannot move freely. The gears of the countershaft are always connected to the output shaft. These connected gears have different ratios.



First gear – This gear is larger in size and has three times more teeth than the gear mounted on the countershaft. Because of this, this gear rotates three times slower than the gear on the countershaft. and three times the torque on the output shaft

In order to transmit power to the output shaft, one of the free gears moving on the output shaft needs to be locked. Hence two hubs are fixed on the output shaft.

Which are permanently fixed on the shaft. and rotate with the shaft. While the other gears remain in a free state. Their gears are locked with the shaft by the hub.

Due to this, the shaft starts rotating. The hub is fitted with a sleeve that moves accelerating on the hub on the side of each gear.


3. Synchro Mesh Gear Box –

In this type of system, it is important to connect the two gears moving at different speeds easily without noise.

That the speed of both the gears is the same before adding up. The word synchro is used for moving together. Equalizing the speed of two parts moving at different speeds is called synchronizing.

The gears running at different speeds in the gearbox need to be shifted to the same speed before shifting. For which a device is used in the gearbox. This is called the synchronizer unit.

This device equalizes the speed of two gears before shifting them. And the gears shift smoothly. It works on the principle of a friction clutch system. In this system, a synchronized unit is used to shift gears.

The synchronized unit consists of the following parts

synchronized clutch
synchronized clutch spring
synchronized ring
synchronized clutch slip

Let’s know some faults in the gearbox and their remedies


Manual transmission Advantages

  • Let us know about some of the advantages of manual transmission which are as follows
    Manual transmissions are less complicated in construction than automatic transmissions, due to which their maintenance costs are less, therefore their biggest advantage is that their maintenance cost is less, except for the clutch in manual transmissions, all other parts last for thousands of miles. also does not require maintenance


  • Manual transmission system gives more driving control than automatic transmission system and other variable transmission, such as in places like rough or sandy land, this type of transmission system is used more, but at present, manual transmission system remains less in more vehicles like There are many vehicles like trucks, buses, etc. in which manual transmission is used.


  • Another advantage of a manual transmission is push starting yes if ever there is a problem with starting the vehicle then push starting can be an option which only happens in manual transmissions it is also commonly known as clutch starting and crash starting This method can be used whenever the battery in the ignition system is down or other systems are not working.


  • This type of transmission system is also considered very good in terms of fuel, in which fuel consumption is reduced by about 12%.


Manual transmission Disadvantages

Now you know what are the advantages of a manual transmission, let us know about some disadvantages of manual transmission which are as follows

  • One of the disadvantages of a manual transmission is that those who are learning to drive and using manual transmission may face difficulties and in addition, there may be problems in stopping and driving the vehicle in hilly places.


  • In a manual transmission system, the gear has to be shifted manually but in an automatic transmission, it is done automatically so it takes time to understand manual transmission


  • A manual transmission is more complex than an automatic transmission depending on the usage as it requires more attention to shift gears, including operating the clutch pedal correctly. There is more to learn about this type of system than an automatic transmission. need to learn


video credit to  Lesics




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Automatic transmission system

First of all, know what is the automatic transmission system. For your information, let us tell you that drive mode is used in automatic transmission and the gears shift automatically in the rest of the vehicle, there is no need to shift manually. In today’s changing times The use of automatic transmission systems is increasing, you will get to see this type of gearbox in modern cars, let us now know what are the types of automatic transmissions.


Types of an automatic transmission system


Torque converter

In today’s era, this type of transmission is seen a lot, it is a standard automatic transmission, and you all must be well aware that the clutch is used to change the gear, but in this type of system, the clutch key is used to shift the gear. It is not required, but a hydraulic fluid coupling or torque converter does this work, it is often connected to the ECU i.e. electronic control unit from the engine and allows precise control of the vehicle, so that the vehicle runs smoothly and automatically, slack back them. Also called because they never have fast gear shifting


Automatic Manual Transmission

Now you know what a torque converter is and how it works, let us now know what is Automated Manual Transmission, so for your information, let us tell you that a regular gear and clutch setup is used in this, but in this type of gear system Sensors, processors, pneumatics and accurate work automatically in this type of gear system.


Dual-Clutch Transmission and

Before this, you know about automated manual transmission, and now you know what is the dual-clutch transmission system. For your information, let us tell you that it is a hybrid system with automatic and manual transmissions.

the torque converter is used in this two separate shafts used to shift the gear in dual-clutch transmission two shafts are used and these two shafts have their own separate clutches this type of clutch system Gears are shifted very quickly and easily, although noise is high in this type of transmission system, it is used extensively.


Continuous Variable Transmission

This is also a type of automatic transmission system. Steel gears are not used in this type of transmission system, but a gearbox pulley is used in this type of system. It allows an engine to rotate at higher rpm. And also provides better gear shifting, there are two types of continuously variable transmission CVT, one hydrostatic continuously variable transmission which sends power to the engine, for this, it uses a hydrostatic motor and variable displacement pump and the other which is toroidal Continuous variable transmission is called. Disc and power roller are used for this process. In this type of transmission system, there is better acceleration in the engine and the engine gets more power. The speciality of this system is that it consumes fuel. Low consumption and low maintenance cost

Direct shift gearbox

Two shafts are also used in this type of transmission system, its working is almost similar to a torque converter transmission system, gear shifting is very fast in this type of transmission system and at the same time it is a type of dry transmission system. The gearbox fluid is never required to be changed in this system, the clutch remains dry and the friction quality is reduced. Direct shift gearbox DSG is a transmission system that maintains lubrication in the clutch, due to which the gearbox lasts longer. Runs up and the gears shift easily. This type of transmission system has been used in automobiles for a long time.






Automatic transmission Advantages

You have come to know the automatic transmission system very well, now let us know about some of the advantages of the automatic transmission system which are as follows

  • If you look at the automatic transmission system from the point of view of fuel, then it is very important.
  • It is good because, in today’s time, there is a lot of fuel consumption, due to which it can be a good option.
  • The biggest advantage of this type of transmission is that there is no need to shift gears in it, rather it becomes automatic. If you want to travel a long distance, then the automatic transmission is better because the automatic transmission system automatically shifts gears according to the engine. Does
  • One advantage of an automatic transmission is that those who have difficulty shifting gears manually or those who are beginners in driving, do not have to face the problem of repeatedly using the clutch and shifting gears and they can drive smoothly. are learned




Automatic transmission Disadvantages

This type of transmission system is very complex in design, it is also very expensive in cost, its initial cost is also high and maintenance cost is also high.

An automatic transmission system consumes more fuel than a manual transmission, one of the reasons for this is also that when there is some reduction in torque converter control, fuel consumption occurs, and it consumes about 12% more fuel than a manual transmission system.

Mechanical efficiency in automatic transmission systems is less than in manual transmission and torque is also limited. It is not a suitable option for off-road driving. Transmission fluid needs to be changed at about 50000 km.

video credit to          Lesics


Gearbox problems


 Noise from gearbox

You must have ever seen that due to the continuous running of the gearbox for a long time, there are some defects in it, which need to be resolved. One of which is the noise coming from the gearbox, some of the reasons are as follows

 Reason                                                 Solution

1. Gears have broken teeth             change gear

2 . Gearbox bearings are                Check if bearings and

      faulty or broken –                       replace defective bearings

3. The gearbox is not                       Check the gearbox to make 

  aligned with the engine –              sure it is aligned with the engine

4. The synchronized                       Replace the –  Ring

ring is worn out or broken

5. Gearbox lacks lubrication –     Fill gear oil


                                                          On leaking gear oil


             Reason                                                                        solution

1. Gearbox is too oily –                                            fill oil to a certain surface

2 . Drain plug Washer cut off –                             Replace another washer

3. There is a hole in the gear housing.                check to housing

4. Gearbox oil seat is cut –                                     Replace the oil seat

5. Drain plug bolt is cut or defective –               Replace another drain plug


                                          turns off automatically after shifting gears


              Reason                                                                                                            solution

1. Gears have sharp or worn teeth                                                            change gears

2 . Gears are crooked                                                                                    change gears

3. Gear selector spring is broken or weakened –                                  Replace the selector shaft spring

4. Adjustment of gear link is bad –  Check and correct the adjustment

                                                         difficulty shifting gears

            Reason                                                                                                             solution

1. Gear Teeth Are Broken –                                                                change gear

2 . Gearbox lacks lubrication –                                                         Fill a certain amount of gear oil

3. There is a fault in the gear selector mechanism –                   Check and remedy

4. The shaft grooves are defective –                                                 Replace the new main shaft in this case

5. Clutch not disengaging properly –                                               Adjust clutch correctly

Hope you got to know something about some faults in the gearbox and their remedies.

how gearbox works

The gearbox transmits the power from the engine to the wheels, to which gear sets are attached to the gearbox.


Now you know what is a gearbox and how many types are there. How did you like this post, send us your suggestions in the comment box and share this post with others and do follow us on FACEBOOK and INSTAGRAM

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