Abstract: A tensioning device for a flexible drive means, such as a chain or a belt, includes a housing, a tensioning piston movably arranged in the housing and provided with a hollow space, a pressure chamber for hydraulic fluid arranged between the housing and the tensioning piston, a vent opening arranged in the tensioning piston, and a damping means in flow communication with the vent opening and with the pressure chamber. A packing element is arranged in the hollow space of the tensioning piston and is at least a component of the damping means, such that the damping means comprises a capacity for hydraulic fluid which corresponds to at least 30% of the volume of the pressure chamber added in a 1 mm stroke of the tensioning piston in the extension direction. The device relates to a series of tensioning devices as well as a transmission and a series of transmissions.

Abstract: A tensioning device for a flexible drive means, such as a chain or a belt, includes a housing, a tensioning piston movably arranged in the housing and provided with a hollow space, a pressure chamber for hydraulic fluid arranged between the housing and the tensioning piston, a vent opening arranged in the tensioning piston, and a damping means in flow communication with the vent opening and with the pressure chamber. A packing element is arranged in the hollow space of the tensioning piston and is at least a component of the damping means, such that the damping means comprises a capacity for hydraulic fluid which corresponds to at least 30% of the volume of the pressure chamber added in a 1 mm stroke of the tensioning piston in the extension direction. The device relates to a series of tensioning devices as well as a transmission and a series of transmissions.

Abstract: The present invention relates to a timing chain drive for an internal combustion engine, comprising a crankshaft sprocket and at least one camshaft sprocket, a chain which is wrapped around these two sprockets, and a tensioning device, said tensioning device comprising a pivotable tensioner blade and a chain tightener which presses said tensioner blade against the chain, the tensioner blade being adapted to be moved, by means of the chain tightener, between a position of minimum tensioning and a position of maximum tensioning, when the timing chain drive is in operation, and being adapted to be moved to a mounting position in the assembled or disassembled condition of the chain tightener, characterized in that, on the side facing the chain tightener, the tensioner blade is provided with a projection which rests on the engine in the mounting position and which is of such a nature that the chain is maintained in a position of safe engagement.