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Displacement types

Bellows are expansion joints, which are used to absorb displacements. Types and forms of expansion/contraction are shown.

Displacement types

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Name Description
Axial displacement Basic displacement that changes only in the length direction of bellows
Perpendicular-to-an-axis
displacement
Displacement that changes parallel at one end as the length of bellows is
constant
* Assuming that the displacement directions are X direction and Y direction
perpendicular to it, caution is required because effects on performance vary
depending on whether displacements occur simultaneously in the X and Y
directions(XY complex displacement: pattern B) or singly in the X or Y direction
(XY single displacement: pattern A)
Angular displacement Displacement that changes as the end-face angle of bellows differs
* Caution is required because the load applied to the bellows differs according
to the difference in the center position of angular displacement
The load is the lightest when the center point of the bellows is the center of
angular displacement
Single displacement Axial, perpendicular-to-an-axis, or angular displacement that occurs by only one
condition
Complex displacement Axial, perpendicular-to-an-axis, or angular displacement that occurs by two or
more conditions
Offset displacement Displacement that occurs in an axial direction with a certain displacement in a
perpendicular-to-an-axis direction

Glossary of bellows terms

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