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Machine Theory
Mechanism and Machine Theory 43 (2008) 1462–1477
ate/mechmt
Investigation of a novel elastic-mechanical wheel
transmission under light duty conditions
Yangzhi Chen a, X. Liu b,*, . Chetwynd b, P. Huang a
a School of Mechanical Engineering, South China University of Technology, Guangzhou 510641, China
b School of Engineering, The University of Warwick, Coventry CV4 7AL, UK
Received 4 May 2006; received in revised form 22 June 2007; accepted 19 November 2007
Available online 4 January 2008
Abstract
A novel ‘Elastic Engagement and Friction Coupled’(EEFC) mechanical transmission has been proposed recently in
which the power is transmitted through elastic tines on the surfaces of the driving and driven wheels. This study introduces
new variations of EEFC mechanical wheel transmission (broadly emulating a gear-pair) with small contact areas for use
under light duty conditions. Because a drive of this type inevitably has a strong ponent, theoretical analysis
of the geometrical and mechanical relationships has been attempted by using linear modeling and empirical weightings.
Several simple forms of the EEFC wheel transmission are tested under limiting (slip) conditions for transmission force
and transmission coefficients against normal load. Normalized standard deviation of these parameters is used to summa-
rize noise performance. Models and experiments are in reasonable agreement, suggesting that the model parameters reflect
important design considerations. EEFC transmissions appear well suited to force regimes of a few tenths of a newton and
to have potential for use in, for example, millimetre-scale robots.
Ó 2007 Elsevier Ltd. All rights reserved.
Keywords: Elastic mesh; Friction; Mechanical wheel transmission; EEFC
1. Introduction
A new type of mechanical transmission method has been proposed recently [1], called by its inventors the
Elastic Engagement and Friction Coupled, or EEFC,