Patent ID: 6058976
Filing Date: 2000-05-09
Classification: B32B,B60G,F15B

Abstract:
A hydropneumatic accumulator, including at least one sphere in which an internal cavity is subdivided into two chambers, one chamber containing a gas and the other a liquid, the subdivision being accomplished by an elastic impermeable membrane for the gas and liquid and wherein the membrane is formed and comprises:(a) a co-polymeric impermeable film including OH groups and being impermeable to gas;(b) two layers between which is incorporated the film and including a supple and elastic material of a co-polymer having blocks of polyamides and blocks of polyethers; and(c) a rubber coating positioned on at least one of the layers and of elastic and supple material;(d) whereby resistance to mineral oil placed in a compartment of the hydropneumatic accumulator and leaktightness of the membrane mounting in this accumulator are provided.