To transmit torque from rotating power source to another device gears or gear trains are used. There are different types of gears such as spur gear, helical gear, double helical gear, bevel gear, crown gear, hypoid gear, worm gear, rack and pinion, epicyclical gear, etc. [4] Designing of gear is such a vast and critical process that whole research coverage in such work is very difficult. To provide speed and torque conversion to output shaft from rotating source, the gearbox is used. Multispeed gearboxes are used in the applications where frequent changes in speed or torque at the output shaft are required. The transmission of motion and power from the input source to output is possible due to the meshing of teeth of the gears. This paper consists of designing of 9 speed gearbox and the procedure for calculating the number of teeth on gear including structure and ray diagram. [3] For analysis, the gearbox assembly is created in CATIA and the .igs file is exported to ANSYS. Also deformation is attained as the gear efficiency depends on the deformation. The result shows that the deformation and maximum stresses are under safe limits.
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