Roller bearing
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[0024]FIG. 1 shows a partial section view of a first embodiment of a roller bearing according to the present invention. As shown in FIG. 1, a roller bearing according to the present embodiment comprises an outer ring 11, an inner ring 12, a cylindrical roller 13 and a retainer 14; and, in the right (in FIG. 1) end portion of the inner ring 12, there is formed a collar portion 15. The collar portion 15 is used to guide the cylindrical roller 13 in the circumferential direction of the outer ring 11 and inner ring 12. In case where the diameter of the cylindrical roller 13 is 2R (=19 mm), the height h from the raceway surface 12a of the inner ring 12 to the leading end of the collar portion 15 is set such that h=approx. 0.38R (3.65 mm). Also, the collar portion 15 has a roller guide surface 15a extending almost at right angles to the raceway surface 12a of the inner ring 12. The cylindrical roller 13 is structured such that, while its end face 13a is slidingly contacted with the roller...
Example
[0026]Next, FIG. 3 shows a partial section view of a second embodiment of a roller bearing according to the present invention. As shown in FIG. 3, a roller bearing according to the present embodiment comprises an outer ring 11, an inner ring 12, a conical roller 16 and a retainer 14; and, in the right (in FIG. 3) end portion of the inner ring 12, there is formed a collar portion 15. The collar portion 15 is used to guide the cylindrical roller 13 in the circumferential direction of the outer ring 11 and inner ring 12. In case where the maximum diameter of the conical roller 16 is 2R, the height h from the raceway surface 12a of the inner ring 12 to the leading end of the collar portion 15 is set such that h=approx. 0.6R. Also, the collar portion 15 has a roller guide surface 15a extending almost at right angles to the raceway surface 12a of the inner ring 12. The conical roller 16 is structured such that, while its end face 16a is slidingly contacted with the roller guide surface 15...
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