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US 2011/0297906 A1Published application
Hydraulic tensioning device for a flexible drive means
AssigneeSchaeffler Technologies AG & Co. KG
InventorsRoman Kern, Reinhard Koch
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AssigneeSchaeffler Technologies AG & Co. KG
InventorsRoman Kern, Reinhard Koch
Estimating the term…
A hydraulic tensioning device (1) for a flexible drive element, particularly for a chain or a belt, is provided, and includes a housing (2) that has a cylindrical inner surface (3) at least in some regions, a piston (4) is arranged in the housing (2) in an axially displaceable manner, and an inner chamber (5) is formed by the housing (2) and the piston (4) for receiving hydraulic fluid. At least one vent hole (6) is integrated in the housing (2) and/or in the piston (4) is in contact with the surroundings (U). In order to provide a reliably ventilated system that has a simple design and that can be implemented in a cost-effective manner, a sealing element (7) is arranged in a region of the vent hole (6), and the sealing element is permeable to gas but not to hydraulic fluid.
Hydraulic tensioning device for a flexible drive element, the device comprises a housing with a cylindrical inner surface at least in some sections, a piston is arranged for movement in an axial direction in the housing and an inner space formed by the housing and the piston for holding hydraulic fluid is in connection with the surroundings via at least one ventilation hole machined into at least one of the housing or the piston, and in a region of the ventilation hole, a sealing element is arranged that is permeable for gas and is impermeable for hydraulic fluid.
Dependencies are inferred from the claim text.