Patent ID: 7775924

Claim:
Hydraulic tensioning device for a traction mechanism drive of an internal combustion engine, comprising a tensioning piston, which is guided in a displaceable manner in a cylinder, a pressure chamber, which is defined by the tensioning piston and the cylinder and which is used for receiving hydraulic fluid, and a pressure relief valve, which limits a pressure in the pressure chamber, the pressure relief valve is comprised at least partially of a pre-assembled assembly that is insertable into the tensioning piston, wherein the pre-assembled assembly contacts a pressure relief spring located within the piston, wherein the pressure relief spring biases the pressure relief valve to a closed position, is in contact with and located entirely outside of the pre-assembled assembly, wherein the pre-assembled assembly houses a moving valve element that is a valve ball, wherein the assembly comprises a receptacle body as a stationary valve element, which is connected to a cage holding the moving valve element.