Patent ID: 7918755

Claim:
Eccentric tensioning device for a traction means drive, comprising: a track roller device, which as such comprises a running disk and a rolling bearing provided for supporting the running disk, a work eccentric for supporting the track roller device, such that it can be displaced in a radial direction relative to a rotating axis of the rolling bearing according to a magnitude of pivoting of the work eccentric, the work eccentric being supported on an adjustment eccentric, a single torsion spring for pretensioning the work eccentric, supported at a first spring end by the work eccentric and supported at a second spring end by a base plate, and a fixing device for securing the work eccentric in a mounting position, in which the torsion spring is located in a pretensioned state, the fixing device including an axially extending projection connected to the base plate having a radially inwardly directed projection extending from an end thereof, and the work eccentric includes a recess or groove that corresponds to the radially inwardly directed projection in which the radially inwardly directed projection is engaged in an assembled pre-tensioned state of the tensioning device prior to installation, the fixing device is positionable on a flange surface upon which the eccentric tensioning device is mountable during attachment of the eccentric tensioning device, in which the running disk is forced radially relative to the rotating axis of the rolling bearing against the associated traction means under effect of the work eccentric, wherein a free switching path is traversed by moving the radially inwardly directed projection out of the recess or groove through an axial play being overcome during attachment of the eccentric tensioning device to the flange surface using an attachment screw, and the axial play (S) is overcome against an axial force applied solely by the torsion spring.