Abstract
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.
Highlights
The automobile market of today is built around a common goal of creating environmentally friendly vehicles, such as electric and fuel cell electric vehicles
In order to find the corresponding graphs, the numbers of links and joints according to the number of independent loops are determined, and 38 unlabeled graphs of two-DOF kinematic chains shown in Table 2 are enumerated
The search specification that variable compression ratio (VCR) engine mechanisms must satisfy and the excluded cases from the enumeration are identified, and they are used to assign the links to the vertices in the enumerated unlabeled graphs
Summary
The automobile market of today is built around a common goal of creating environmentally friendly vehicles, such as electric and fuel cell electric vehicles. Proposed a kinematic conceptual design procedure for in-line four-cylinder VCR engine mechanisms considering vertical second harmonic acceleration. Mo et al [17] classified various VCR engine mechanisms according to their kinematic graphs. Ematic conceptual design procedure for in-line fourcylinder VCR engine mechanisms considering vertical second harmonic acceleration. If a contracted graph of kinematic chains to be synthesized is determined, it can be expanded by replacing the edges in the contracted graph by binary strings to obtain conventional graphs, and each graph can be translated into the corresponding kinematic chain. The above procedure is used for the enumeration and type synthesis of VCR engine mechanisms that can be outlined as follows [19]
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