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research-article

A Fully Compliant Homokinetic Coupling

[+] Author and Article Information
Davood Farhadi Machekposhti

Mechatronic System Design Group, Department of Precision and Microsystems Engineering, Delft University of Technology, Delft, The Netherlands
d.farhadimachekposhti@tudelft.nl

Nima Tolou

Mechatronic System Design Group, Department of Precision and Microsystems Engineering, Delft University of Technology, Delft, The Netherlands
n.tolou@tudelft.nl

Justus Herder

Mechatronic System Design Group, Department of Precision and Microsystems Engineering, Delft University of Technology, Delft, The Netherlands
j.l.herder@tudelft.nl

1Corresponding author.

ASME doi:10.1115/1.4037629 History: Received February 12, 2017; Revised August 05, 2017

Abstract

This paper introduces a homokinetic coupling, a constant velocity universal joint (CV joint), which is fully compliant and potentially monolithic. The proposed compliant design can accommodate a high misalignment angle between the input and the output rotational axes. To guarantee a one-to-oneconstant velocity rotation transmission for all different misalignment angles, extra kinematic constraints are applied on well-known Double Hooke's universal joint. The influence of the extra constraints on degrees of freedom (DoF) of the mechanism is studied by means of screw theory. Furthermore, it was shown the mechanism is yet a one DoF linkage for rotation transmission and a two DoF rotational joint as all universal joints. The kinematic of the mechanism is studied and constant velocity conditions are identified. The Pseudo-Rigid-Body Model (PRBM) of the angled arrangement of the Double Hooke's universal joint is created and the input-output torque relationship is then studied. Different possible compliant configurations and design arrangement based on the PRBM model were discussed and illustrated. Moreover, One of the proposed compliant counterparts is dimensioned as a power transmission coupling for a high misalignment angle, up to 45 deg. Further, a prototype was manufactured for the experimental evaluation and it is shown that the results are consistent with the PRBM and the finite element modeling.

Copyright (c) 2017 by ASME
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