Lightweight low permeation piston-in-sleeve accumulator

Details Lightweight low permeation piston-in-sleeve accumulator Lightweight low permeation piston-in-sleeve accumulator

2006-09-19

2006-09-19

Brinson, Patrick (Department: 3754)

Pipes and tubular conduits

With pressure compensators

Variable capacity chambers

C138S030000, C138S026000, C220S721000

Reexamination Certificate

active

07108016

ABSTRACT:
A lightweight, low permeation, piston-in-sleeve high pressure accumulator is provided. The accumulator includes a cylindrical composite pressure vessel with two integral rounded ends. A piston slidably disposed in a thin nonpermeable internal sleeve in the accumulator separates two chambers, one adapted for containing a working fluid and the other adapted for containing gas under pressure. Working fluid is provided in a volume between the nonpermeable internal sleeve and the composite pressure vessel wall. Further means are provided for withstanding harmful effects of radial flexing of the composite vessel wall under high pressures, and from stresses present in use in mobile applications such as with a hydraulic power system for a hydraulic hybrid motor vehicle. A method for pre-charging the device is also presented.

REFERENCES:
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patent: 4714094 (1987-12-01), Tovagliaro
patent: 6527012 (2000-12-01), Weber

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