Patent ID: 8323137
Filing Date: 2012-12-04
Classification: F16H

Abstract:
1. Hydraulic tensioning element for a traction mechanism drive, comprising a cylinder, a piston that can move in an axial direction and that is guided in the cylinder, a spring element arranged between the cylinder and the piston, a pressure space formed in the cylinder and a supply space formed in the piston for hydraulic fluid, and a valve that allows an exchange of the hydraulic fluid between the pressure space and the supply space as a function of an actuating movement of the piston, the cylinder has a curled edge reducing an opening thereof and, an annular section is formed on a free end of the piston with a diameter that is enlarged compared with a diameter of the piston and is adapted to an inner diameter of the cylinder, the piston at its free end has a flange with a diameter that is enlarged compared with the diameter of the piston and is adapted to the inner diameter of the cylinder with a leakage gap located therebetween, an annular space is defined between the flange, the annular section, and an inner wall of the cylinder, wherein upon movement of the piston into the cylinder the hydraulic fluid is adapted to flow from the pressure space to the supply space via a flow path defined by the leakage gap, the annular space, and a lateral opening that extends to the supply space in the piston.