Abstract
In this chapter, the fundamentals of the profile shift of spur gear involute toothing generated by rack-type cutter are first described, highlighting also the technical-applicative interest of the use of this type of profile-shifted toothing The problem is analyzed in its maximum generality, so the cases of zero profile-shifted toothing and of profile-shifted toothing without and with variation of center distance are discussed, both for external and internal spur gears In this general framework, the problems related to the minimum profile shift coefficient to avoid interference and the risk of pointed teeth are also discussed. The problem of how to split the sum or difference of the profile shift coefficients between the pinion and mating gear wheel is then dealt with, under the double aspect of direct problem and inverse problem also with reference to the different criteria that can be used to achieve specific design goals. Finally, the problem of how to ensure the optimal value of backlash between the mating teeth of cylindrical spur gears is discussed.
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