Orientation crown i.e. roller bearing, for grinding and milling machine tool, has rollers arranged in corresponding rows, and comprising rotational axes inclined with respect to orientation axis at angles of specific degree, respectively

摘要

The crown (1) has inner and outer rings (2, 3) arranged around an orientation axis (X-X) of the crown. Cylindrical rollers (4a, 7a) are arranged in corresponding rows (4, 7) and arranged between roller tracks of the inner ring and roller tracks of the outer ring, respectively. The rollers of the rows comprise rotational axes (Y-Y) that are inclined with respect to the orientation axis at angles (alpha1, alpha2) ranging between 34 and 40 degree, respectively. Each roller is dimensioned such that ratio between its effective length (Leff) and diameter is greater than 1 and less than 2. An independent claim is also included for a grinding and milling machine tool comprising an orientation crown.