Cord reinforced resilient membrane
View Patent ↗A cord reinforced resilient membrane (or diaphragm) having a high radial (transverse) stiffness and a relatively low axial stiffness, wherein the cord reinforced resilient membrane has adapatability for use in both hydraulic and conventional strut mounts, as well as other applications, and wherein the radial stiffness provided by the cords is directionally tunable for utilization in a particular application.
1. A strut mount for interfacing with a strut shaft, comprising:
a membrane comprising:
a sheet membrane body composed of a resilient material having an inner periphery and an outer periphery, a membrane diameter between said inner and outer peripheries and a membrane thickness, wherein said membrane diameter is greater than said thickness by at least about an order of magnitude; and
at least one cord set embedded within said membrane body, said cord set comprising a plurality of cords;
wherein said at least one cord set imparts a radial stiffness to said membrane body which exceeds an axial stiffness of said membrane body;
a sleeve adapted for mounting to the strut shaft;
a structural member spaced from said sleeve and adapted for being supported by the strut shaft in moving relation responsive to said strut shaft in response to jounce and rebound;
a valve plate connected with said sleeve and said structural member;
a secondary resilient membrane connected to said sleeve and said structural member;
an upper chamber bounded by said membrane at one end and said valve plate at the opposite end; and
a lower chamber bounded by said secondary resilient membrane at one end and said valve plate at the opposite end;
wherein hydraulic fluid is disposed in said upper and lower chambers;
wherein said membrane is connected with said inner periphery with said sleeve and at said outer periphery with said structural member such that said membrane is a substantially incompliant volumetric boundary confinement for said hydraulic fluid;
wherein said membrane provides axial compliance to jounce and rebound while maintaining the radial stiffness; and
wherein a ration of the radial stiffness to the axial stiffness is between substantially about 11 to 1 and 20 to 1.
2. The strut mount of claim 1 , wherein said at least one cord set is arranged such that the radial stiffness is greater in at least one selected radial direction than the radial stiffness in at least another radial direction.
3. The strut mount of claim 1 , wherein said at least one cord set is arranged such that the radial stiffness is greater in at least one selected radial direction than the radial stiffness in at least another radial direction.
4. The strut mount of claim 1 , wherein said at least one cord set comprises a plurality of mutually woven cord sets.
5. The strut mount of claim 1 , wherein:
said membrane body is a rubber; and
said cords are selected from the group consisting of: nylon, polyester, rayon, steel, fiberglass, and poly-para-phenylene terephthalamide.