The contact ratio for gear is greater than or equal to 1. When there exists a continuous transmission of motio, It is essential that at least one tooth of one wheel is in contact with another tooth of the second wheel therefore it is obvious that the contact ratio must always be greater than or equal to 1.
The contact ratio is the numerical determination of the number of teeth on each gear when any gear set is in mesh. Contact ratio can also be defined as the average number of tooth pairs in contact during one rotation
Summary:
The contact ratio for gear is
The contact ratio for gear is greater than or equal to 1.The contact ratio is the numerical determination of the number of teeth on each gear when any gear set is in mesh.
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