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A vibration damping bellows with a high vibration absorbing effect and whose a simple structure. In a vibration damping coupling, for example, the vibration damping bellows is formed by interposing viscoelastic material, material with low elasticity, or combination thereof between an inner member an

A vibration damping bellows with a high vibration absorbing effect and whose a simple structure. In a vibration damping coupling, for example, the vibration damping bellows is formed by interposing viscoelastic material, material with low elasticity, or combination thereof between an inner member and an outer member, which are made of stainless steel. The stainless steel inner member and/or outer member may be omitted when occasion demands. The material of the stainless steel plate, for example, may be SUS 304 that is austenitic stainless steel. Further, flanges to perform connection with pipes may be provided in both ends of the bellows. The viscoelastic material may comprise elastomer such as silicone rubber and vibration damping alloy.

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What is claimed is: 1. A vibration damping pipe which is expansible-and-contractible in an axial direction, comprising: an inner member having a bellows shape, the inner member comprising austenitic stainless steel; an outer member having a bellows shape disposed outside the inner member, the outer

What is claimed is: 1. A vibration damping pipe which is expansible-and-contractible in an axial direction, comprising: an inner member having a bellows shape, the inner member comprising austenitic stainless steel; an outer member having a bellows shape disposed outside the inner member, the outer member comprising austenitic stainless steel; and a viscoelastic member disposed between the inner member and the outer member, the viscoelastic member comprising silicone rubber; wherein the inner member extends in the axial direction from a first inner member end to a second inner member end, and the first inner member end and the second inner member end are separated by a first distance in the axial direction; wherein the outer member extends in the axial direction from a first outer member end to a second outer member end, and the first outer member end and the second outer member end are separated by a second distance in the axial direction; wherein the first distance is greater than the second distance; wherein the viscoelastic member extends in the axial direction from a first viscoelastic member end substantially aligned with the first outer member end to a second viscoelastic member end substantially aligned with the second outer member end, and the first viscoelastic member end and the second viscoelastic member end are separated by a distance substantially equal to the second distance in the axial direction. 2. A vibration damping pipe which is expansible-and-contractible in an axial direction, comprising: an inner member having a bellows shape, the inner member comprising austenitic stainless steel, wherein the inner member extends in the axial direction from a first inner member end to a second inner member end, and the first inner member end and the second inner member end are separated by a first distance in the axial direction; an outer member having a bellows shape disposed outside the inner member, the outer member comprising austenitic stainless steel, wherein the outer member extends in the axial direction from a first outer member end to a second outer member end, and the first outer member end and the second outer member end are separated by a second distance in the axial direction; a viscoelastic member disposed between the inner member and the outer member, the viscoelastic member comprising silicone rubber; a first flange welded to the first inner member end but not to the first outer member end; and a second flange welded to the second inner member end but not to the second outer member end; wherein the first distance is greater than the second distance. 3. A vibration damping pipe which is expansible-and-contractible in an axial direction, comprising: an inner member having a bellows shape, the inner member comprising austenitic stainless steel; an outer member having a bellows shape disposed outside the inner member, the outer member comprising austenitic stainless steel; and a viscoelastic member disposed between the inner member and the outer member, the viscoelastic member comprising silicone rubber; wherein the viscoelastic member includes flaked pieces of silicone rubber, granular pieces of silicone rubber, or powered pieces of silicone rubber. 4. A vibration damping pipe which is expansible-and-contractible in an axial direction, comprising: an inner member having a bellows shape, the inner member comprising austenitic stainless steel; an outer member having a bellows shape disposed outside the inner member, the outer member comprising austenitic stainless steel; and a viscoelastic member disposed between the inner member and the outer member, the viscoelastic member comprising silicone rubber; wherein the viscoelastic member extends in the axial direction from a first viscoelastic member end to a second viscoelastic member end; wherein a portion of the inner member and a portion of the outer member extend (i) beyond the first viscoelastic member end in a first axial direction from a point between the first viscoelastic member end and the second viscoelastic member end, and (ii) beyond the second viscoelastic member end in a second axial direction, different than the first axial direction, from the point; wherein the portion of the inner member and the portion of the outer member extending beyond the first viscoelastic member end form a first ring; wherein the portion of the inner member and the portion of the outer member extending beyond the second viscoelastic member end form a second ring. 5. The vibration damping pipe according to claim 4, wherein: the first ring is configured so as to be attachable to a first flange; and the second ring is configured so as to be attachable to a second flange. 6. The vibration damping pipe according to claim 5, wherein: the first ring includes holes for attaching the first ring to the first flange; and the second ring includes holes for attaching the second ring to the second flange. 7. A vibration damping coupling including a vibration damping pipe which is expansible-and-contractible in an axial direction, the pipe comprising: an inner member having a bellows shape, the inner member comprising austenitic stainless steel; an outer member having a bellows shape disposed outside the inner member, the outer member comprising austenitic stainless steel; and a viscoelastic member disposed between the inner member and the outer member, the viscoelastic member comprising silicone rubber; wherein the inner member extends in the axial direction from a first inner member end to a second inner member end, and the first inner member end and the second inner member end are separated by a first distance in the axial direction; wherein the outer member extends in the axial direction from a first outer member end to a second outer member end, and the first outer member end and the second outer member end are separated by a second distance in the axial direction; wherein the first distance is greater than the second distance; wherein the viscoelastic member extends in the axial direction from a first viscoelastic member end substantially aligned with the first outer member end to a second viscoelastic member end substantially aligned with the second outer member end, and the first viscoelastic member end and the second viscoelastic member end are separated by a distance substantially equal to the second distance in the axial direction. 8. A vibration damping coupling including a vibration damping pipe which is expansible-and-contractible in an axial direction, the pipe comprising: an inner member having a bellows shape, the inner member comprising austenitic stainless steel, wherein the inner member extends in the axial direction from a first inner member end to a second inner member end, and the first inner member end and the second inner member end are separated by a first distance in the axial direction; an outer member having a bellows shape disposed outside the inner member, the outer member comprising austenitic stainless steel, wherein the outer member extends in the axial direction from a first outer member end to a second outer member end, and the first outer member end and the second outer member end are separated by a second distance in the axial direction; a viscoelastic member disposed between the inner member and the outer member, the viscoelastic member comprising silicone rubber; a first flange welded to the first inner member end but not to the first outer member end; and a second flange welded to the second inner member end but not to the second outer member end; wherein the first distance is cireater than the second distance.