Radial needle bearing: precautions for assembly and installation

Choosing the right shaft and housing fit is very important for optimizing the performance and life of radial needle bearing. This article will discuss some key considerations in this field.
The radial needle bearing can exert its maximum performance only when it is correctly installed on the shaft and in the housing. On the contrary, improper bearing fit, too loose or too tight, will lead to poor operating conditions and early failure.
So, what factors need to be considered when choosing the fit of radial needle bearing? The following is a list of factors that bearer users need to pay attention to:

The direction, type and size of the load-calculate the equivalent radial load based on the actual axial and radial load. Generally speaking, as the load increases, a tighter fit is required. In addition, the ring radial needle bearing the circumferential load should have a tight fit. For rings that only bear point loads, loose fits can be used.inner ring or outer ring rotation-usually, the rotating ring needs an interference fit, and the non-rotating ring will have a slight loose fit.Specify the size and type of bearings-thin and miniature bearings are very sensitive to interference fits due to radial clearance losses. radial needle bearing with heavier cross-sections generally require a tighter fit.

Material and manufacturing tolerances of mating parts-fit tolerances are based on cast iron or steel housing and shaft. For alloys such as aluminum (with different modulus of elasticity), a tighter fit is required to achieve rigid seating.
Operating temperature-through the tight fit and the temperature difference between the inner and outer rings, the radial inner clearance in the radial needle bearing is reduced. This must be taken into consideration when selecting the internal clearance. In addition, if the materials used for the radial needle bearing seat or shaft are different, their thermal expansion coefficient will be different from that of the bearing ring. This must be taken into account in order to achieve a rigid seat.

Required operating accuracy-In order to achieve higher operating accuracy, the expected high accuracy and surface quality standards in the bearing must also apply to the shaft and housing. In addition, for miniature and thin bearings, irregularities on the shaft or bearing seat are transferred to the relatively thin bearing ring.

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