Hydraulic tensioning device for a chain drive

A hydraulic tensioning device for a chain drive, the hydraulic tensioning device comprising:

• a holder;
• a tensioning piston guided in the holder, the tensioning piston including locking grooves on an outer peripheral surface thereof;
• an inner guide that extends into a hollow space of the piston;
• a locking element that has two annular sections and two radial extensions, the locking element is movable into engagement with one of the locking grooves with the two annular sections thereof;
• a clamping stop and a sliding stop that are spaced apart from each other in an axial direction on the holder;
• two axial extensions on the holder, the sliding stop being located on the axial extensions, the two axial extensions extend in the axial direction between a clamping stop plane defined by the clamping stop and a sliding stop plane defined by the sliding stop, the two axial extensions are arranged separated from each other on opposite sides of the tensioning piston in an area of the sliding stop plane, the two radial extensions of the locking element extend radially beyond the two axial extensions and the tensioning piston.