Patent ID: 6874859

Claim:
A shaft/roller unit for tracked vehicles including excavators and tractors, said shaft/roller unit comprising: a roller formed by a pair of axially drilled half-rollers hardened in their entirety, bringing their hardness to more than 50 Rockwell C, and welded together in the median plane of the roller, perpendicular to its axis by means of flush welding with the addition of welded material, each of said half-rollers being fitted on a shaft with the sole interposition of a pair of antifriction bearings; the shaft having a shoulder in its central portion, for abutment by the antifriction bearings, and the shoulder having an outside diameter larger than the diameter of the shaft, wherein the axial hole in the half-rollers having a diameter smaller than the outside diameter of the shoulder, wherein the half-rollers have a first recess in the central portion of the roller for housing the shoulder and wherein end flanges of each antifriction bearing are directly in abutment with respective half-rollers on either side of the shoulder so as to enforce a predetermined axial position of the roller on the shaft, and providing for replaceability and exchange of the entire shaft/roller unit.