Research and development of new variable compression ratio (VCR) engine mechanism (1st report, Basic characteristics and design of VCR engine mechanism)

In order to improve the efficiency of combustion engines, variable compression ratio (VCR) engine is researched. VCR engine changes the compression ratio according to its mechanical configuration. One of the solutions to construct VCR engine is the multi-link type. Multi-link type has an advantage f...

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Main Authors: Hidenori KOMATSUBARA, Sadatomo KURIBAYASHI
Format: Article
Language:Japanese
Published: The Japan Society of Mechanical Engineers 2018-03-01
Series:Nihon Kikai Gakkai ronbunshu
Subjects:
Online Access:https://www.jstage.jst.go.jp/article/transjsme/84/860/84_17-00372/_pdf/-char/en
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author Hidenori KOMATSUBARA
Sadatomo KURIBAYASHI
author_facet Hidenori KOMATSUBARA
Sadatomo KURIBAYASHI
author_sort Hidenori KOMATSUBARA
collection DOAJ
description In order to improve the efficiency of combustion engines, variable compression ratio (VCR) engine is researched. VCR engine changes the compression ratio according to its mechanical configuration. One of the solutions to construct VCR engine is the multi-link type. Multi-link type has an advantage for reducing high order shaking force which is the source of mechanical vibration. Since piston motion strongly influences shaking force, it is required to make the piston displacement profile close to sine curve. However, conventional combustion engine is designed based on four-link piston crank mechanism. Because of the design constraint due to four-design parameters regarding the four-link piston crank mechanism, piston displacement profile diverges from sine curve. In order to solve this problem, six-link piston crank mechanism is applied to VCR engine. Since six-link piston crank mechanism has six-design parameters, the piston displacement profile becomes closer to sine curve than that of the four-link piston crank mechanism. A Stephenson type six-link piston crank mechanism whose constitute four-bar mechanism is the double-crank mechanism is newly designed. Basic characteristics of VCR engine model, that includes the piston displacement profile and its similarity for sine-curve, and peak acceleration amplitude with respect to different compression ratio, was researched based on kinematic analysis. The obtained theoretical results are compared with experimental ones. As a result, experimental values almost agree with theoretical values.
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spelling doaj.art-3be6c39170e84bf682033822fa6e02ad2022-12-22T02:47:23ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612018-03-018486017-0037217-0037210.1299/transjsme.17-00372transjsmeResearch and development of new variable compression ratio (VCR) engine mechanism (1st report, Basic characteristics and design of VCR engine mechanism)Hidenori KOMATSUBARA0Sadatomo KURIBAYASHI1Yamagata Univ. Graduate School of Science and EngineeringDepartment Kuribayashi steamshipIn order to improve the efficiency of combustion engines, variable compression ratio (VCR) engine is researched. VCR engine changes the compression ratio according to its mechanical configuration. One of the solutions to construct VCR engine is the multi-link type. Multi-link type has an advantage for reducing high order shaking force which is the source of mechanical vibration. Since piston motion strongly influences shaking force, it is required to make the piston displacement profile close to sine curve. However, conventional combustion engine is designed based on four-link piston crank mechanism. Because of the design constraint due to four-design parameters regarding the four-link piston crank mechanism, piston displacement profile diverges from sine curve. In order to solve this problem, six-link piston crank mechanism is applied to VCR engine. Since six-link piston crank mechanism has six-design parameters, the piston displacement profile becomes closer to sine curve than that of the four-link piston crank mechanism. A Stephenson type six-link piston crank mechanism whose constitute four-bar mechanism is the double-crank mechanism is newly designed. Basic characteristics of VCR engine model, that includes the piston displacement profile and its similarity for sine-curve, and peak acceleration amplitude with respect to different compression ratio, was researched based on kinematic analysis. The obtained theoretical results are compared with experimental ones. As a result, experimental values almost agree with theoretical values.https://www.jstage.jst.go.jp/article/transjsme/84/860/84_17-00372/_pdf/-char/enmechanismmachine elementdesignvaliable compression ratiobalancingsix-link machanism
spellingShingle Hidenori KOMATSUBARA
Sadatomo KURIBAYASHI
Research and development of new variable compression ratio (VCR) engine mechanism (1st report, Basic characteristics and design of VCR engine mechanism)
Nihon Kikai Gakkai ronbunshu
mechanism
machine element
design
valiable compression ratio
balancing
six-link machanism
title Research and development of new variable compression ratio (VCR) engine mechanism (1st report, Basic characteristics and design of VCR engine mechanism)
title_full Research and development of new variable compression ratio (VCR) engine mechanism (1st report, Basic characteristics and design of VCR engine mechanism)
title_fullStr Research and development of new variable compression ratio (VCR) engine mechanism (1st report, Basic characteristics and design of VCR engine mechanism)
title_full_unstemmed Research and development of new variable compression ratio (VCR) engine mechanism (1st report, Basic characteristics and design of VCR engine mechanism)
title_short Research and development of new variable compression ratio (VCR) engine mechanism (1st report, Basic characteristics and design of VCR engine mechanism)
title_sort research and development of new variable compression ratio vcr engine mechanism 1st report basic characteristics and design of vcr engine mechanism
topic mechanism
machine element
design
valiable compression ratio
balancing
six-link machanism
url https://www.jstage.jst.go.jp/article/transjsme/84/860/84_17-00372/_pdf/-char/en
work_keys_str_mv AT hidenorikomatsubara researchanddevelopmentofnewvariablecompressionratiovcrenginemechanism1streportbasiccharacteristicsanddesignofvcrenginemechanism
AT sadatomokuribayashi researchanddevelopmentofnewvariablecompressionratiovcrenginemechanism1streportbasiccharacteristicsanddesignofvcrenginemechanism