Patent ID: 7850561

Claim:
Tensioning device for a traction element drive, comprising a tensioning arm, which can pivot relative to a body about a pivot axle and having a roller on a distal end thereof that is supported rotatably, a torsion spring is provided between the pivot axle of the tensioning arm and the body for tensioning the traction element, and the tensioning arm is slidably supported on the pivot axle via at least one radial-bearing arrangement and at least one axial-bearing arrangement, the axial-bearing arrangement comprises a friction disk arranged concentric to the pivot axle, the friction disk has an axial stop surface which comprises at least one radial circumferential key groove; and at least one radial circumferential friction spring having an outer diameter substantially equal to the friction disk and which extends into the key groove, is provided on a surface adjacent to the stop surface of the friction disk, the friction disk has a multiple-part construction comprising two rings arranged concentric to each other, and the rings are connected to each other by compensating elements that extend in a radial direction between the rings and connect the rings to each other elastically.