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US 11,028,954 B2Granted
Accumulator having a diaphragm or bladder with a metallized barrier film
AssigneeFreudenberg-NOK General Partnership
InventorsJoe Walker, Paul J. Hochgesang, Nate Tuckerman
Life of this patent
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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.
Claims12
A diaphragm for an accumulator, comprising:
- a thermoplastic film formed in a defined shape, wherein the thermoplastic film has a thickness of between 4 and 8 mils;
- a metallic layer disposed on both sides 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.
1 more element
A bladder for an accumulator, comprising:
- a thermoplastic film formed in a bulbous-shape, wherein the thermoplastic film has a thickness of between 4 and 8 mils;
- a metallic layer disposed on both sides 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.
1 more element
Dependencies are inferred from the claim text.