Fluid-filled cylindrical vibration damping device

A fluid-filled cylindrical vibration damping device comprising:

• an inner shaft member;
• an outer sleeve member disposed radially outwardly of said inner shaft member in a spaced-apart relationship with said inner shaft member;
• an elastic body interposed between said inner shaft member and said outer sleeve member for elastically connecting said inner shaft member and said outer sleeve member with each other;
• a plurality of fluid chambers formed between said inner shaft member and said outer sleeve member and filled with a non-compressible fluid so that fluid pressures in said plurality of fluid chambers vary relative to each other upon application of a vibrational load to said vibration damping device;
• and
• a first orifice passage always permitting a fluid communication between said plurality of fluid chambers and being at least partially defined by an elastic member adapted to be subjected to shear deformation as a result of increase of a fluid pressure acting on said first orifice passage so that a cross sectional area of said first orifice passage increases according to an increase of said fluid pressure acting on said first orifice passage owing to said shear deformation of said elastic member.