Impervious resilient membrane and hydropneumatic accumulator fitted with that membrane
AssigneesAutomobiles Peugeot, Automobiles Citroen
InventorPhilippe Moureaux
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Abstract
An impervious resilient membrane for fitting a hydropneumatic accumulator and consisting of a film having a thickness of 10-200 microns constituted by a graft polymer formed by the reaction of thermoplastic polyurethane with a copolymer of ethylene and vinyl alcohol, this film being arranged in sandwich-like fashion between two layers of thermoplastic polyurethane, the membrane being adapted to be mounted in an automotive vehicle suspension sphere to there define two chambers containing a gas and a liquid, respectively.
Claims12
An impervious resilient membrane adapted to fit a hydropneumatic accumulator and to be subjected on one side to the pressure of a gas and on the other side to the pressure of a liquid, said membrane comprising a first material and a second material in association, wherein said first material gives said membrane the required elasticity and is selected from the group consisting of thermoplastic polyurethanes, block amide polyethers, flexible polyesters and mixtures thereof, and wherein said second material is enclosed by said first material to provide imperviousness to said gas and is selected from the group consisting of copolymers of ethylene and vinyl alcohol, polyamides, polyvinylidene chloride and mixtures thereof.
Dependencies are inferred from the claim text.