The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 22, 1992
Filed:
Jul. 01, 1991
Harry C Ralph, Kirkland, WA (US);
The Boeing Company, Seattle, WA (US);
Abstract
A high pressure hydropneumatic shock absorber (10) includes a cylinder (12) with a piston (16) slidably positioned within the cylinder (12). The piston (16) and cylinder (12) are configured as a telescopic suspension unit. The piston (16) defines a first variable volume chamber (28) within the cylinder (12) and is filled with a working liquid. A reservoir (44) includes an interior movable barrier wall (62) defining first (60) and second (64) separated variable volume reservoir chambers. The first reservoir chamber (60) is filled with working liquid and the second reservoir chamber (64) is filled with a working gas. A flow-controlling damper valve (58) communicates the first cylinder chamber (28) with the first reservoir chamber (60). Relative telescopic movement of the piston (16) and cylinder (12) cause damped flow of the working liquid from the first cylinder chamber (28) to the first reservoir chamber (60) and cause responsive movement of the barrier wall (62) to allow expansion of the first reservoir chamber (60) and corresponding reduction of the second reservoir chamber (64), thereby compressing the working gas. A method of charging a hydropneumatic shock absorber (10) having a telescopic piston cylinder unit (12, 16) comprises the steps of providing a first variable volume chamber (28) defined by the piston (16) within the cylinder (12). A flow-controlling damper valve (58) communicating the first chamber (28) with a reservoir (44) is also provided. The first chamber (28) and reservoir (44) are filled with a predetermined volume of a working liquid and a predetermined volume of a working gas at a predetermined pressure. Further working fluid is added, thereby compressing the working gas, until the working liquid and working gas reach a predetermined desired static pressure at a predetermine relative position of the piston 16 to the cylinder 12.