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Rotor Design
Published in Wei Tong, Mechanical Design and Manufacturing of Electric Motors, 2022
The term interference refers to the fact that one part slightly interferes with the space that the other is taking up. Interference fit is often used to join two mating parts together either semipermanently or permanently. Interference fit can be generally achieved by shaping the two mating parts so that one or the other (or both) slightly deviates in size from the nominal dimension. In the motor industry, interference fit is extensively used to join rotor cores and shafts, as well as stator cores and housings, for its high joining strength and concentricity between the mating parts. Interference fit can be divided into several types as discussed in the following.
Tolerancing
Published in Ken Morling, Stéphane Danjou, Geometric and Engineering Drawing, 2022
If the internal mating part will always be larger than the external mating part, then this is an interference fit. Since usually we have to apply a certain force to assemble two mating parts in an interference fit, this is also called force fit or shrink fit. As an example, whenever forces need to be transmitted from one component to the other, interference fits are used. Examples are bushings in a wheel hub, clutches on a shaft end and rocker arms.
Engineering Drawing Principles
Published in Keith L. Richards, The Engineering Design Primer, 2020
In this class of fit, the shaft is always larger than the hole into which it fits; hence, there is always an overlapping of the mating parts, as shown in Figure 2.52c. Interference fit is a form of a tight fit requiring a degree of pressure to achieve a fit between the components.
A new way to solve tolerance analysis: the Cassino Unified Tolerance Analysis tool
Published in International Journal of Computer Integrated Manufacturing, 2019
However, the parts to be assembled are not rigid but they have mechanical properties and consequently different stiffness. Therefore, an interference fit deforms the bodies ensuring a final assembly where the parts are locked to each other, due to the arisen stress state, and the interference does not exist anymore.