Chain drive, especially for the control drive of internal combustion engines

A timing control chain drive, comprising first chain tensioning means engaging at a non-loaded chain section, characterized in that a further chain tensioning means is provided which engages at another chain section, the tensioning movement of the further tensioning means being derived from the first tensioning means, the tensioning movement of the further tensioning means is operable to be blocked in a direction opposite the tensioning movement direction by a unilaterally and automatically operating blocking means, the further tensioning means is additionally elastically prestressed in the tensioning direction, the further tensioning means is arranged in the section of the chain which returns from a given wheel that is most sensitive as regards an arcuate phase coordination, and in that the further tensioning means engages at a chain section arranged between two driven wheels.

A timing control chain drive, comprising first chain tensioning means engaging at a non-loaded chain section, characterized in that a further chain tensioning means is provided which engages at another chain section, the tensioning movement of the further tensioning means being derived from the first tensioning means, and in that the further tensioning means engages at a chain section arranged between two driven wheels.