Patent ID: 8950945
Filing Date: 2015-02-10
Classification: E21D,F16C

Abstract:
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 (Y 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.