Design of a compliant hinge based on closed form pressure balancing

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Abstract

Compliant mechanisms consist of a monolithic body and obtain motion through elastic deformation. Multiple compliant flexure designs are known but their translational to rotation stiffness ratio is often limited. This work introduces a novel compliant hinge design with increased stiffness ratio compared to the state of the art compliant hinges. The hinge functions by having an encapsulated fluid medium that contributes to high normal stiffness, but doesn’t influence the rotational stiffness. A 2D design model is presented that shows the effect of the geometry on the stiffness ratio performance. Subsequently, a computational 3D analysis is performed and the resulting design is realized as a demonstrator. The performance is compared to conventional compliant hinges based on the stiffness ratio. This shows an increase of at least a factor 30 on the stiffness ratio

Original languageEnglish
Title of host publicationProceedings of the 44th Mechanisms and Robotics Conference (MR)
PublisherASME
Number of pages12
ISBN (Electronic)978-0-7918-8399-0
DOIs
Publication statusPublished - 2020
EventASME 2020 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC-CIE 2020 - Virtual, Online
Duration: 17 Aug 202019 Aug 2020

Publication series

NameProceedings of the ASME Design Engineering Technical Conference
Volume10

Conference

ConferenceASME 2020 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC-CIE 2020
CityVirtual, Online
Period17/08/2019/08/20

Keywords

  • Compliant mechanism
  • Pressure balancing
  • Rotational hinge
  • Stiffness ratio

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