Vibration damping body and method for fabricating same

A vibration damping washer comprising:

• first and second metal plates, each said metal plate having an exposed face, said metal plates arranged so that said exposed faces are disposed toward each other;
• at least two rubber visco-elastic layers wherein a first said visco-elastic layer is integrally bonded to an exposed face of a first said metal plate and a second said visco-elastic layer is secured to said first visco-elastic layer by an adhesive layer located therebetween;
• and
• a plurality of spaced apart spot connecting assemblies for securing said metal plates together so that said second metal plate is located adjacent said second visco-elastic layer and is not integrally attached to said visco-elastic layer so that said metal plates can vibrate relative to each other, each said spot connecting assembly including a member associated with one said metal plate that is directed to the other said metal plate and an opening formed in the other said metal plate for receiving said member.

A vibration damping body for a pressed construction comprising:

• a rigid base plate;
• a macromolecular visco-elastic layer adhered to said rigid base;
• a plate-shaped member positioned over said macromolecular visco-elastic layer;
• and
• a plurality of spot connecting assemblies for securing said plate-shaped member to said rigid base plate without integrally bonding said plate-shaped member to said visco-elastic layer wherein said spot connecting assemblies are configured so as to allow said plate-shaped member to vibrate on said visco-elastic layer;
• each said spot connecting assembly including a tab associated with said plate-shaped member that extends into a complimentary opening formed in said rigid base plate.

A method for fabricating a vibration damping body for a vibration isolation washer comprising the steps of:

• making a plurality of first basic components by forming rubber visco-elastic layers on both sides of a plurality of metal plates
• making a plurality of second basic components, each of which consists of two said basic components adhered to each other wherein said second basic components are manufactured by adhesively securing visco-elastic layers of adjacent first basic components to each other;
• aligning a plurality of second basic components over each other, wherein said visco-elastic layers of adjacent second basic components abut each other;
• and
• mechanically connecting said second basic components together at a plurality of spaced apart locations with fingers that extend between one said second basic component into openings formed in the adjacent said second components so that said abutting visco-elastic layers associated with adjacent said second basic components are not integrally bonded together and said second basic components are able to vibrate relative to each other.

A method for fabricating a vibration damping body for a vibration isolation washer comprising:

• making a plurality of first basic components by forming a rubber visco-elastic layer on one side of a plurality of metal plates;
• making a plurality of second basic components by forming rubber visco-elastic layers on both sides of a plurality of metal plates;
• making at least one third basic component by adhering two said second components to each other so that abutting visco-elastic layers of adjacent said second components are integrally bonded to each other;
• positioning first basic components on opposed sides of a said third basic component so that said visco-elastic layers of said first basic components abut said opposed visco-elastic layers of said third basic component;
• and
• mechanically securing said first basic component to said third basic component at a plurality of spaced apart locations without bonding said visco-elastic layers of said first basic components to said abutting visco-elastic layers of said third basic component so that said basic components can shift positions relative to each other.