In this case, the ring does not need to have an interference fit.ĭirection of load indeterminate refers to variable or alternating external loads, sudden load peaks, vibration or unbalanced loads in high-speed applications. Under these conditions, a bearing ring normally does not creep and there is no risk of fretting corrosion or wear. Stationary loads occur where both the bearing ring and the applied load are stationary or both are rotating at the same speed. To prevent this from happening, an adequate interference fit, between the ring subjected to rotating load and its seat, is required. For the purpose of selecting fits, loads that oscillate (such as loads acting on connecting rod bearings) are considered to be rotating loads. A bearing ring mounted with a loose fit will creep on its seat when subjected to a rotating load, and this can lead to fretting corrosion and eventually wear. Rotating loads occur where either the bearing ring or the applied load is stationary while the other rotates. Essentially, there are three different conditions: When selecting fits, you should consider the following topics.Ĭonditions of rotation refer to the relative motion between a bearing ring and the load acting upon it. SKF bearing fit chart do not cover all details of a specific application and so you may find that adjustments may be necessary. Tolerances for seats of bearings mounted on tapered sleeves They are valid for moderate speeds and moderate precision requirements. Suitable tolerances are listed in table below. The total run-out tolerances should be the same as for bearings on cylindrical seats. The fit is determined by the distance through which the inner ring is driven up on a tapered sleeve.įor seats of bearings mounted on tapered sleeves, wider diameter tolerances are permissible. SKF bearings with a tapered bore are always mounted with an interference fit for the inner ring. SKF bearings with a tapered bore mounted on tapered sleeves So that no radial load can act on the thrust bearings. Housing washer must be fitted with an adequate radial gap Separate bearings provide radial location Tolerances for cast iron and steel housings - seats for thrust bearingsįor less precise bearing arrangements, there can be a Light to normal loads (P = 0,1 C) with simple working conditions Light to normal loads (P = 0,1 C), axial displacement of outer ring desirable Normal to heavy loads (P > 0,05 C), axial displacement of outer ring unnecessaryįor non-split housings and split housings Heavy loads on bearings in thin-walled housings, heavy peak loads (P > 0,1 C) Tolerances for cast iron and steel housings – seats for radial bearings Tolerances for solid steel shafts - seats for thrust bearingsĬombined radial and axial loads on spherical roller thrust bearings Under difficult operating conditions (P > 0,1 C) Heavy to very heavy loads and high peak loads Tolerances for solid steel shafts - seats for radial roller bearings Rotating inner ring load or direction of load indeterminateĮasy axial displacement of inner ring on shaft desirableĮasy axial displacement of inner ring on shaft unnecessary Tolerances for solid steel shafts - seats for radial ball bearings Recommended seat tolerances for SKF metric bearings For information about tolerance, refer to SKF bearing tolerances. The tighter P6 tolerance zone changes the resulting fit only slightly. They can also be used for bearings to P6 dimensional tolerances. These recommendations are valid for bearings with Normal dimensional tolerances. You should considered selecting fits and tolerances for SKF bearing seats and abutments. They are valid for standard applications but do not cover all details of a specific application.
The following SKF bearing fit chart provide recommendations for tolerances of shaft and housing seats. For more information, refer to SKF bearing selection. These recommendations will provide adequate solutions for the majority of applications. SKF bearing fits can be selected by following the recommendations for bearing seat diameter tolerances. SKF bearing fit chart, selecting SKF bearing fits
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