Fluid torque-restraint system with optimized fluid expansion

Claim 1

A fluid torque-restraint system for restraining the torque between an aircraft engine and a structure, which is used with at least one other resilient mount, wherein said fluid torque-restraint system comprises: a) a first hydraulic mounting; b) a substantially similar second hydraulic mounting; c) said first hydraulic mounting and said second hydraulic mounting each further including an inner member for connecting to said engine, and an outer member for connecting to said structure and an rubber section resiliently connecting said inner member and said outer member; d) said outer member, said inner member and said rubber section cooperating to form a fluid chamber within each said hydraulic mounting; e) said fluid chambers within said first hydraulic mounting and said second hydraulic mounting being interconnected by a conduit means having a given length and diameter and said fluid torque-restraint system being filled with a predetermined volume of incompressible fluid and said fluid operating at an equilibrium temperature; f) whereby said volume of said fluid contained within said fluid torque-restraint system being selected according to the equation: Vf={(T/Δt)(1/(2R Ap Kv Ct))} where Vf is the fluid volume needed, T is the applied torque, Δt is the temperature change experienced by the fluid, R is the radius from the center of said engine to said hydraulic mounting, Ap is the piston area of said hydraulic mounting, Kv is the volume stiffness of said fluid torque-restraint system, and Ct is the coefficient of thermal expansion of said fluid, whereas said volume of said fluid can be determined to substantially counteract the rotation of said engine relative to said structure under a torque T, the change in said volume of said fluid being caused by a temperature change Δt experienced by said fluid as said engine reaches said equilibrium temperature.