Roller bearing for a tunneller

摘要

A roller bearing for a tunneller having an inner ring, an outer ring, two sets of rolling elements arranged between the tracks formed on the rings, the first set of rolling elements including at least one roller able to withstand axial stresses and the second set of rolling elements including an angular-contact roller that is able to withstand both radial and axial stresses, the inner and outer rings being concentric about an axis of rotation of the roller bearing. Each roller in the first set includes a first axis of revolution (Y1-Y1) inclined in relation to the axis of rotation (X-X) by a first angle (α1) of between 45° and 95° and each roller in the second set includes a second axis of revolution (Y2-Y2) inclined in relation to the axis of rotation (X-X) by a second angle (α2) of between 0° and 45°.

主权项

1. A roller bearing for a tunneller, comprising:
an inner ring, an outer ring, first and second sets of rolling elements arranged between tracks formed on the inner ring and the outer ring the first set of rolling elements including at least one roller able to withstand axial stresses and the second set of rolling elements including an angular-contact roller that is able to withstand both radial and axial stresses, wherein the inner and outer rings are concentric about an axis of rotation (X-X) of the roller bearing, and wherein each roller in the first set includes a first axis of revolution (Y1-Y1) inclined in relation to the axis of rotation (X-X) by a first angle (α1) between forty five degrees (45°) and ninety-five degrees (95°) and each roller in the second set includes a second axis of revolution (Y2-Y2) inclined in relation to the axis of rotation (X-X) by a second angle (α2) of greater than zero degrees (0°) and not more than forty five degrees (45°), the first roller set comprising first and second rows of rollers such that each roller in the first row of rollers has an end surface in radial contact with an end surface of a roller in the second row of rollers to form a roller pair such that the first roller set comprises a plurality of roller pairs, and a plurality of first inserts each positioned around one of the plurality of roller pairs, the plurality of first inserts being detached from each other, the plurality of first inserts being positioned such that each of the plurality of first inserts abuts two other of the plurality of first inserts, wherein the plurality of first inserts covers all of at least three, but less than four, later sides of the roller pair such that at least a portion of a lateral side of the roller pair remains unclosed, wherein all of the four lateral sides are oriented generally perpendicular to the portions of the inner and outer rings that contact the roller pair.