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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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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.

The fundamental law of gearing states that for a constant velocity ratio, the pitch point must be stationary.

DrD

to have constant velocity, the gear pair must have same module and same no. of teeth

To get same speed we should have same pitch circle and same number of teeth.

For constant velocity ratio the pitch circle of both gears should be constatnt.

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