KOYO Bearing 21308RZ

Product description of KOYO Bearing 21308RZ

KOYO Spherical roller bearings, KOYO Bearing 21308RZ, The spherical roller bearing has a high load rating and self-aligning ability, therefore it is suitable for applications at low/medium speed which involve heavy load and impact. This bearing comprises of barrel-shaped convex rollers arranged diagonally. Due to the raceway of its housing raceway washer being spherical, this bearing is self-aligning and can allow a certain degree of angle tilt. KOYO Spherical roller bearings, KOYO Bearing 21308RZ, The subject of this work is the optimization of correction of the roller generators in the spherical roller bearing. Arch correction, resulting from the bearing construction, and arch-logarithmic correction have been discussed herein. In the studies on the effect of correction parameters on the contact capacity, the authors used a computer program enabling one to determine, for any roller generator correction profile, the pressure distribution in the contact, and then to determine the contact capacity indicator. KOYO Spherical roller bearings, KOYO Bearing 21308RZ, The diagrams of the contact capacity indicator as a function of Steinbeck's unit load, obtained in the course of investigations, have been presented. It has been found that arch correction in the spherical roller bearing should only serve the purpose of ensuring a proper ratio of osculation coefficients for both races, which would allow obtaining the self-stabilization of the barrel and minimum friction losses. On the other hand, the barrel-race mating conditions can only be guaranteed by the simultaneous use of arch-logarithmic correction.

Self-aligning ball or spherical roller bearings in the non-locating position need to be able to slide within the housing seating. This sliding, however, causes axial vibrations which can reduce bearing service life considerably. Bearing arrangements that use CARB® toroidal roller bearings as the non-locating bearing are stiff because the bearing can be radially and axially located in the housing and on the shaft. This is possible because thermal expansion of the shaft is accommodated within the bearing. The stiffness of the bearing arrangement, combined with the ability of the bearing to accommodate axial movement, substantially reduces vibrations within the application to increase service life of the bearing arrangement and related components.

With the same center as the bearing. the spherically formed outer ring raceway can make self alignment. Their rolling elements linearly come into contact with the raceways of inner ring and outer ring. The bearings can take greatly radial load, suitable for heavy machinery used in mining, metallurgical, paper-making and instructing, etc., Industry.

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