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2004•Seimitsu kougakkaishi rombunshuu/Seimitsu kougakkaishi/Seimitsu Kougakkaishi rombunshuuOpen access

Study on a Twistable Vacuum Bellows

Hiroyuki TSUGANE, Hiroyuki Shimizu, Hiroshi Fukasawa, Katsuhiro Katsuki, Takashi Mishiba, Eiji Wakamatsu, Masato Yoshioka

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Abstract

A vacuum bellows assembly that can follow a twisted displacement around the axis is newly developed. It consists of 36 convolutions with a core whose inner circle is eccentric to the outer one. The deformation of the bellows is analyzed by means of a finite element method (FEM), while a torsional moment is applied to the bellows. From the analytical result, it is explained that the new bellows can be twisted much easier than a traditional bellows. Besides, it is experimentally shown that the newly developed bellows with a total length of 86 mm, an inner diameter of 40 mm and an outer diameter of 70 mm is able to be twisted quite smoothly up to about 5°.

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What this paper is about

A vacuum bellows assembly that can follow a twisted displacement around the axis is newly developed. It consists of 36 convolutions with a core whose inner circle is eccentric to the outer one. The deformation of the bellows is analyzed by means of a finite element method (FEM), while a torsional moment is applied to the bellows. From the analytical result, it is explained that the new bellows can be twisted much easier than a traditional bellows. Besides, it is experimentally shown that the newly developed bellows with a total length of 86 mm, an inner diameter of 40 mm and an outer diameter of 70 mm is able to be twisted quite smoothly up to about 5°.

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Available abstract

A vacuum bellows assembly that can follow a twisted displacement around the axis is newly developed. It consists of 36 convolutions with a core whose inner circle is eccentric to the outer one. The deformation of the bellows is analyzed by means of a finite element method (FEM), while a torsional moment is applied to the bellows. From the analytical result, it is explained that the new bellows can be twisted much easier than a traditional bellows. Besides, it is experimentally shown that the newly developed bellows with a total length of 86 mm, an inner diameter of 40 mm and an outer diameter of 70 mm is able to be twisted quite smoothly up to about 5°.

Key concepts: Bellows, Finite element method, Core (optical fiber), Structural engineering, Materials science, Deformation (meteorology), Mechanical engineering, Composite material

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