Abstract: A tensioning device, more particularly a hydraulically actuated chain tensioner, for a chain drive of an internal combustion engine, having a tensioner housing, a tensioning piston which is displaceably guided in a piston bore of the tensioner housing and has a piston skirt, a transport securing means for fastening the tensioning piston in the tensioner housing, a adjustment apparatus for incrementally adjusting and limiting the working range of the tensioning piston, and a final position securing means for the captive arrangement of the tensioning piston in the piston bore. The transport securing means, the adjustment apparatus and the final position securing means together have a single securing ring for fastening the tensioning piston in the tensioner housing, the incremental adjustment and limiting of the working range of the tensioning piston and the captive arrangement of the tensioning piston.

Abstract: A chain drive in an internal combustion engine, with at least two shafts having at least one chain wheel each, wherein at least one chain wheel is formed of a toothed ring and a hub element, which are connected to one another through detachable attachment elements, and the hub element is connected to a shaft by a central attachment system. The abutment surface of the hub with the shaft and the attachment surface between the toothed ring and the hub element are arranged in a manner offset with respect to one another.