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  4. Design of a Triple Crossed Flexure Pivot With Minimized Parasitic Shift
 
conference paper

Design of a Triple Crossed Flexure Pivot With Minimized Parasitic Shift

Thalmann, Etienne  
•
Henein, Simon  
November 17, 2021
Proceedings of the ASME 2021 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
ASME 2021 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference

Thanks to their absence of play, absence of contact friction and possible monolithic fabrication, flexure pivots offer advantages over traditional bearings in small-scale, high accuracy applications and environments where lubrication and wear debris are proscribed. However, they typically present a so-called parasitic center shift that deteriorates their rotational guidance accuracy. Existing solutions addressing this issue have the drawbacks of reducing angular stroke, prohibiting planar design, or introducing overconstraints or underconstraints. This article introduces a new triple crossed flexure pivot called TRIVOT that has a reduced parasitic shift without overconstraints nor internal mobility while allowing either optimal stress distribution in the flexures or a planar design. The new architecture also makes it possible to place the center of rotation outside of the physical structure, which is not the case with traditional bearings. Based on finite element simulations, we show that the parasitic shift is reduced by one order of magnitude in comparison to the widely used crossed flexure pivot. We also derive and validate formulas for the rotational stiffness and angular stroke limit of the TRIVOT for given dimensions and material, which are valuable for its dimensioning towards practical applications. We expect this new pivot to become a competitive alternative to the crossed flexure pivot for applications where high accuracy and compactness are required.

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Type
conference paper
DOI
10.1115/DETC2021-67948
Author(s)
Thalmann, Etienne  
Henein, Simon  
Date Issued

2021-11-17

Published in
Proceedings of the ASME 2021 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
ISBN of the book

978-0-791885-44-4

Total of pages

9

Volume

8A: 45th Mechanisms and Robotics Conference (MR)

Subjects

Compliant mechanism

•

Flexure pivot

•

Flexure hinge

•

Parasitic shift

•

Accuracy

•

Remote center of compliance

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
INSTANT-LAB  
Event nameEvent placeEvent date
ASME 2021 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference

Virtual, Online

August 17–19, 2021

Available on Infoscience
September 1, 2022
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/183757
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