Interference Fit Application

In engineering terms the fit is the clearance between two mating parts and the size of this clearance determines whether the parts can at one end of the spectrum move or rotate independently from each other or at the other end are temporarily or permanently joined.

Interference fit application. The truth is press fits aren t for every application just like skinny jeans there are pros and cons to interference fits unlike skinny jeans press fits will never go out of style. An interference fit also known as a press fit or friction fit is a form of fastening between two tight fitting mating parts that produces a joint which is held together by friction after the parts are pushed together. Engineering fits are generally used as part of geometric dimensioning and tolerancing when a part or assembly is designed. An improper fit can result in misalignment between parts slippage or in the case of moving parts excess vibration.

Critical components that must not sustain. The correct fit is especially critical in the case of a shaft into a bearing or couple. Depending on the amount of interference parts may be joined using a tap from a hammer or pressed together using a hydraulic ram. Press fit also known as interference fit force fit shrink fit or friction fit relies on friction to hold the parts together 6 8 as shown in fig.

Many times this. This section reports a summary of the available information that can be found on technical literature about the fit tolerance between shafts and holes. Fit is defined as the degree of freedom of tightness between the mating parts in an assembly process it is also defined as the relationship between the hole and the shaft during the assembly is called fit in this article we are going to discuss different types of fits in a detailed way. Transition fit is of two kinds namely push fit and light keying fits.

Common applications of an interference fit include inserting various shapes into holes and shafts into bearings. For any given shaft and hole assembly clearance fit can be decided by the statement according to the limits if the upper limit size of the shaft is. Transition fits are a compromise between clearance and interference fit where a small amount of either clearance or interference is permissible. 26 11 for a press fit the outer diameter of the shaft is slightly larger than the inner diameter of the hub resulting in interference between the two it is simple inexpensive and it can be used to join similar and dissimilar plastics as well.

Interference fit bushing mounted in steel plate clearance fit shaft rotating in bushing transition fit gear held in shaft fig. The aim is to help the designer to choose the appropriate and preferred fit tacking into account the standard uses for mechanical applications. Press fits have so many great features you might wonder why they don t replace all other connections. 10 3 application of types of fits.

Clearance fit is the type of fit in which the shaft diameter is always less than the hole diameter.