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Six Speed Constant Mesh Gear Box No ratings yet.

B. TECH MECHANICAL PROJECTS ( Six Speed Constant Mesh Gear Box)

Design And Fabrication

Abstract –

All the automobile vehicles available are constantly set to changing speed and torque between the engine and driving wheels. Torque is not directly mutilated, but it can be done in the form of power using a suitable device. It is a beneficial method that we adopt, and it is also easily affordable. Many other alternatives, even though more elegant, and appear to be more efficient are not feasible when it comes to transmission.

This project mainly focuses on the design and fabrication of a gearbox that can transmit torque to the maximum and also helps to do some useful work in an automobile where power transmission is a significant factor. The transfer of power is done at six speeds in this project. The setup uses two shafts and thirteen gears arranged at suitable distances to achieve the desired torque and speed.



The present-day world is moving towards globalization. Now to keep at par with the global market, the countries follow a different set of standards.

The primary purpose of these standards is to make a product available, in every nook and corner of the world with the same specifications without any single change.

The standards are being utilized in every field of technology and science. These changes, especially in automobile next to the clutch are the transmission in the

The transmission system of a motor vehicle. The word ” transmission‟ is applied to a device that is located between clutch and propeller shaft. The method used for the transmission is Gear Box.


Design And Fabrication of Six Speed Constant Mesh Gear Box



The six-speed constant mesh gearbox has two shafts, one for the input and the other for output. Six gears are installed on both the cylinders and are in regular mesh. Ball bearings are connected to the gears on the output shaft which makes them rotate freely on the output shaft.

The output gears have extensions on one side for the engagement purpose. The clutches are engaged and disengaged with the speeds by the use of levers. The clutches are keyed to the output shaft. The engine flywheel is connected to the input shaft.

The gears on the output shaft rotate freely on the bearings. To engage the dog clutch with the gear, the respective lever is moved. This moves the clutch towards

The gear and the dog get engaged with the extensions on the gear. The rotation is transferred to the output shaft. The wheels connected to the output shaft are also rotated.



The material for shaft and gear are taken as C 45 steel. The gears and the shafts are fabricated by the following method.



Machining, drilling and boring

These operations were done in gears at the center to produce the hole in the gears to hold on the shaft.



Turning-These operations are done in the lathe for the shaft in which the cylindrical objects may be produced. With the work piece rotating and single point cutting tool.


Welding-This sort of operation is done to fix the gears onto the shaft.


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