Patent ID: 8317643

Claim:
Hydraulic tensioning system that is used in traction mechanism drives of internal combustion engines, the tensioning system comprises a crucible-shaped piston that is guided linearly displaceable in a housing constructed as a cylinder and is spring-loaded against a traction mechanism, wherein a pressure chamber is located between the piston and the cylinder and, as a function of an actuating movement direction of the piston, a hydraulic fluid can flow out of the pressure chamber via an overpressure valve or can flow into the pressure chamber via a one-way valve, and the overpressure valve is integrated within the piston and acts as a damper and includes a valve plate within a deep-drawn valve housing that has a radially inward directed bead as a stroke limit for the valve plate, wherein the valve housing of the overpressure valve is surrounded by a compression spring of the piston that extends to a piston floor, the valve housing of the overpressure valve has a floor, and an opening in the floor forms a valve seat on an inside of the valve housing, and the bead is spaced from the floor of the valve housing.