A belt drive, comprising - at least one belt - at least one belt tensioner - at least one tensioning device, as well as - at least one damper, wherein the belt tensioner has a retaining arm which can be pivoted about a pivot axis, as well as a tensioning roller disposed on the retaining arm, wherein, by means of the tensioning device, a tensioning moment acting with respect to the pivot axis can be exerted on the belt tensioner, wherein, by means of the damper, a pivoting movement of the belt tensioner about the pivot axis can be damped and the damper has directional damping constants, characterized in that a first damping constant for damping a pivoting movement of the belt tensioner about the pivot axis which corresponds to a movement of the tensioning roller onto the belt is larger than a second damping constant for damping a pivoting movement of the belt tensioner about the pivot axis which corresponds to a movement of the tensioning roller away from the belt, wherein the second damping constant is negligibly small, wherein the damper is single-acting in construction so that, by means of the damper, only the pivoting movement of the belt tensioner about the pivot axis which corresponds to the movement of the tensioning roller onto the belt can be damped. - at least one belt - at least one belt tensioner - at least one tensioning device, as well as - at least one damper, wherein the belt tensioner has a retaining arm which can be pivoted about a pivot axis, as well as a tensioning roller disposed on the retaining arm, wherein, by means of the tensioning device, a tensioning moment acting with respect to the pivot axis can be exerted on the belt tensioner, wherein, by means of the damper, a pivoting movement of the belt tensioner about the pivot axis can be damped and the damper has directional damping constants, characterized in that a first damping constant for damping a pivoting movement of the belt tensioner about the pivot axis which corresponds to a movement of the tensioning roller onto the belt is larger than a second damping constant for damping a pivoting movement of the belt tensioner about the pivot axis which corresponds to a movement of the tensioning roller away from the belt, wherein the second damping constant is negligibly small, wherein the damper is single-acting in construction so that, by means of the damper, only the pivoting movement of the belt tensioner about the pivot axis which corresponds to the movement of the tensioning roller onto the belt can be damped. wherein the belt tensioner has a retaining arm which can be pivoted about a pivot axis, as well as a tensioning roller disposed on the retaining arm, wherein, by means of the tensioning device, a tensioning moment acting with respect to the pivot axis can be exerted on the belt tensioner, wherein, by means of the damper, a pivoting movement of the belt tensioner about the pivot axis can be damped and the damper has directional damping constants, characterized in that a first damping constant for damping a pivoting movement of the belt tensioner about the pivot axis which corresponds to a movement of the tensioning roller onto the belt is larger than a second damping constant for damping a pivoting movement of the belt tensioner about the pivot axis which corresponds to a movement of the tensioning roller away from the belt, wherein the second damping constant is negligibly small, wherein the damper is single-acting in construction so that, by means of the damper, only the pivoting movement of the belt tensioner about the pivot axis which corresponds to the movement of the tensioning roller onto the belt can be damped.