Accumulator having a diaphragm or bladder with a metallized barrier film
AssigneeFreudenberg-NOK General Partnership
InventorsJoe WALKER, Paul J. HOCHGESANG, Nate TUCKERMAN
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Abstract
A diaphragm and a bladder for an accumulator each include a thermoplastic film formed in a dome or bulbous shape. A metallic vapor deposition layer is disposed on at least one side of the thermoplastic. Inner and outer rubber layers are adhered on opposite sides of the metallic coated film so that the metallized thermoplastic film provides a barrier film to effectively slow the permeation of a gas such as nitrogen through the diaphragm or bladder.
Claims20
A diaphragm for an accumulator, comprising:
- a thermoplastic film formed in a defined shape;
- a metallic layer disposed on at least one side of the thermoplastic film to form a metallic coated film;
- and
- inner and outer rubber layers adhered on opposite sides of the metallic coated film.
A method of forming a diaphragm of an accumulator, comprising:
- forming a thermoplastic film in a defined shape;
- vapor depositing a metallic layer on at least one side of the thermoplastic film to form a metallic coated thermoplastic film;
- and
- adhering inner and outer rubber layers on opposite sides of the metallic coated thermoplastic film.
A bladder for an accumulator, comprising:
- a thermoplastic film formed in a bulbous-shape;
- a metallic layer disposed on at least one side of the bulbous-shaped thermoplastic film to form a metallic coated bulbous-shaped film;
- and
- inner and outer rubber layers adhered on opposite sides of the metallic coated bulbous-shaped thermoplastic film.
Dependencies are inferred from the claim text.