F - Mech Eng,Light,Heat,Weapons – 16 – F
Patent
F - Mech Eng,Light,Heat,Weapons
16
F
267/63
F16F 7/12 (2006.01) C08L 83/04 (2006.01) F16F 9/00 (2006.01)
Patent
CA 1083617
ABSTRACT OF THE DISCLOSURE An improved device, in the form of a shock absorber, fluid coupling device, vibration damper of the like including a closed chamber, a movable piston rod extending into the chamber. an enlarged piston head within the chamber, and a hydraulic fluid adapted to be disposed within the chamber, thereby to produce a damping effect on the piston rod is provided herein. The improvement resides in utilizing, as the hydraulic fluid, a hydraulic elastomer composed of a polydimethylsiloxane cross- linked by three-carbon bridges, in which the cross-link density is from 0.25 to 0.50 cross-links per 100 silicon atoms, and in which there are from 0.074 to 0.74 free chain ends per 100 silicon atoms, the free ends having an average of from 50 to 100 silicon atoms each, the elastomer being characterized by a Shore A hardness of from 9 to 15, and being further characterized by its ability to absorb energy by flowing under pressure like a fluid. This elastomer is characterized by a combination of a high cross-link density and a high proportion of free chain ends. It crumbles to a powder under high shear stress, but has the unique property of flowing like a viscous fluid through a narrow orifice. It is thus useful in hydraulic impact absorbers and other hydraulic systems.
208631
Marcus & Associates
Stauffer Chemical Company
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