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What condition must be satisfied in order that a pair of spur gear may have a constant velocity ratio?

saurabhjain

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What condition must be satisfied in order that a pair of spur gear may have a constant velocity ratio?

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Normally spur gear are the replaced by other gears like helical, double helical gears,bevel gears etc. Spur gear is normally used in lower speed due its its ability of generating zero axial thrust. 

Now in order to maintain constant gear ratio or speed ratio, their centre of pitch circle must be from fixed and the pitch circle of two mating gears should meet at a point and the line of action should meet at pitctch point in order to satisfy the law of gearing.

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