Static load rating

The values of these factors are provided by the bearing manufacturers in their catalogues, based on the ratios F /Cg and F IFy, where C is the static load rating in kg or N (based on a contact stress of 4200 MPg for ball bearings and 4000 MPj, for roller bearings, also provided in these catalogues. MPg is the unit of stress in Mega-Pascals. 

The allowable load that can be statically loaded on rolling bearings is specihed as a basic static load rating. JIS B1519 (1989), specification has dehned it as The static radial load in the center of the contact area between the rolling element and the raceway receiving the maximum load, corresponding to the calculated contact stresses shown as follows ... 

In this section, noticing the occurrence of cracks in silicon nitride, the static load rating was studied for an all ceramic bearing, in which silicon nitride is used for the inner and outer rings and balls. (This is because if silicon nitride is loaded, cracks appear usually without the occurrence of permanent deformation.) [7, 8]. 

FIGURE 11.1.3 Comparison of cracking load and static load rating. 

Consequently, it can be seen that an all-ceramic bearing made of silicon nitride can well withstand the same load as the static load rating of a conventional steel bearing, and that there are no problems at all in their practical use in terms of their static load rating. 

Static Load Rating of Hybrid Ceramic Bearing... 

Thus, the static load rating of hybrid ceramic bearings is limited by the deformation of steel races. Therefore, the static load rating of hybrid ceramic bearings is 0.85 times the static load rating of steel bearings. 

TABLE 11.1.4 Static Load Rating of Ceramic Rolling Bearings... 

Bearing View on static load rating Static load rating... 

Fujiwara, T., Yoshioka, T., Kitahara, T., Koizumi, S., Takebayashi, H., and Tada, T. (1988). Study on load rating property of silicon nitride of rolling bearing materials, J. JSLE 33 301. Yoshioka, T., Kitahara, T., Takebayashi, H., and Yuine, T. (1989). A new method for static load rating of ceramic rolling bearing. Wear 133 373. 

Basic static-load rating (BSLR) The static load that corresponds to a total permanent deformation of ball and race, or roller and race, at the most heavily stressed contact (0.0001 in [0.00254 mm] of the ball or roller diameter). 

Zhao et al. [193] found in composites with AI2O3 nanoparticles that at quasi-static loading rate the fracture toughness was found nearly unvaried with the filler content. Under impact loading rate, the notched Izod impact strength and the impact... 

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