Underconstraint Eliminator Mechanism in Double Parallelogram Linear Flexure Bearing

Technology #16131

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FIG. 1A is a schematic elevational view of a double parallelogram linear flexure bearing of the prior art;  FIG. 1B is a schematic effective linkage model of representative movement of the bearing of FIG. 1A;FIG. 2A is a schematic elevational view of a double tilted-beam flexure bearing of the prior art;  FIG. 2B is a schematic effective linkage model of representative movement the bearing of FIG. 2A;
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Inventors
Robert Panas
Precision Compliant Systems Lab, MIT
Managed By
Jim Freedman
MIT Technology Licensing Officer - Chemicals, Instruments, Consumer Products
Patent Protection

Underconstraint Eliminator Mechanism in Double Parallelogram Linear Flexure Bearing

US Patent 9,157,476
Publications
Eliminating Underconstraint in Double Parallelogram Flexure Mechanisms
Journal of Mechanical Design, Volume 137, Issue 9

Applications

This invention is used in both macro- and micro- scale applications such as precision machinery and MEMS (Micro Electro Mechanical Systems) devices.

Problem Addressed

Existing Underconstraint Eliminating(UE) flexure bearings presents a range of disadvantages such as asymmetry, static and dynamic performance losses, increased bearing footprint, parasitic kinematic error, and design coupling. Therefore, there is a need for an improved UE Flexure Bearing that addresses these drawbacks.

Technology

The invention is an improved deformable Underconstraint Eliminating (UE) linkage for removing underconstraint in a double parallelogram (DP) linear flexural mechanism. The nested linkage design is shown through analysis and experiment to work as predicted in selectively eliminating the underconstrained degrees of freedom (DOF) in linear flexure bearings. The improvements in this new linkage design will enable wider adoption of underconstraint eliminating (UE) linkages, especially in the design of linear flexural bearings.

Advantages

  • Reduced static and dynamic performance losses
  • Smaller footprints
  • Improved resonance frequency