Type synthesis of variable compression ratio engine mechanisms

Young Kwang Mo, Jae Kyung Shim, Seung Woo Kwak, Min Seok Jo, Ho Sung Park

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Type synthesis of two-degrees-of-freedom (DOF) planar mechanisms has been carried out using graph theory to determine the possible kinematic structures of variable compression ratio (VCR) engine mechanisms with two to three independent loops, and has resulted in the structures of 87 mechanisms satisfying search specification. By applying evaluation criteria to the enumerated mechanisms, the kinematic structures of three mechanisms are selected as suitable VCR engine mechanisms and verified by analysis results. In this research, VCR engine mechanisms with revolute joints and only one prismatic joint are enumerated, and the basic method to determine the VCR engine mechanisms with higher pairs is discussed. The procedure used in this research can be utilized to determine the kinematic structures of desired mechanisms and the results can be used as an atlas of two-DOF adjustable slider-crank mechanisms.

Original languageEnglish
Article number6574
JournalApplied Sciences (Switzerland)
Issue number18
Publication statusPublished - 2020 Sept

Bibliographical note

Publisher Copyright:
© 2020 by the authors.


  • Graph theory
  • Kinematic structure
  • Type synthesis of mechanisms
  • Variable compression ratio (VCR) engine mechanism

ASJC Scopus subject areas

  • General Materials Science
  • Instrumentation
  • General Engineering
  • Process Chemistry and Technology
  • Computer Science Applications
  • Fluid Flow and Transfer Processes


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