Patent ID: 9371879
Filing Date: 2016-06-21
CPC Classification: F16F

Claim Text:
1. A pseudo-linear hydro-pneumatic isolator assembly, comprising: a cylinder having an interior partially filled with a hydraulic fluid; a piston assembly including a piston head and a piston rod attached to one end and movable within the interior of the cylinder, defining a variable hydraulic chamber; at least two accumulators fluidically connected in parallel with the defined variable hydraulic chamber of the cylinder, the at least two accumulators being configured to provide a pseudo linear spring force over an axial stroke of the piston assembly, wherein each of the at least two accumulators is defined by a vessel having a first portion containing a compressible gas and a second portion that receives hydraulic fluid from the chamber, the first and second portions being separated by a movable element acted upon the hydraulic fluid for displacement only after the charging pressure of the contained gas in the first portion exceeds a threshold pressure including a first accumulator charged to a first charging pressure and a second accumulator charged to a second charging pressure that is larger than the first charging pressure, wherein displacement of the piston assembly creates a variable pressure force, the variable pressure force causing active engagement with the first accumulator when the variable pressure force exceeds the first charging pressure and causing active engagement with both the first and second accumulators when the variable pressure force exceeds the second charging pressure, thereby creating a pseudo linear spring force.