Tensioner assembly comprising a displaceable tensioning rail

Tensioner assembly for a traction medium drive, specifically a chain drive, with at least two traction medium wheels and a flexible traction medium, comprising a tensioning rail which can be pressed against the traction medium by means of a tensioning device having a tensioning piston that is extendable relative to the tensioning device along a longitudinal direction, characterized in that the tensioning rail is applied against at least one sliding guide along the longitudinal direction and can be displaced along the at least one sliding guide by means of the tensioning device which is disposed in extension of the tensioning rail, wherein the tensioning device is arranged such that the longitudinal direction deviates in an assembled position by a maximum angle of 30° relative to a connecting line defined between two center points of the at least two traction medium wheels between which the tensioning rail is acting, wherein the tensioning rail comprises an operating surface and the tensioning device comprises a housing and the tensioning piston, wherein the tensioning piston acts on the operating surface, and wherein the first traction medium wheel is smaller than the second traction medium wheel, the tensioning device is arranged at the level of the first traction medium wheel and that, by extending the tensioning piston of the tensioning device out of the housing, the tensioning rail can be pressed away from the first traction medium wheel in the direction of the second traction medium wheel.