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이상원(S.W.Lee),민병순(B.S.Min),조영우(Y.W.Cho),최재권(J.K.Choi) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
The effects of the 2nd land volume and the hole from 2nd land to undercrown were investinated. Oil film thickness, ring motion and 2nd land pressure were analyzed to accomplish that. The oil film thickness between ring and liner was measured by capacitant technique to verify the calculated results. The increase of 2nd land volume reduces oil consumption. It is because of the change of oil film thichness rather than ring motion and blow-up gas rate. The difference of oil film thickness between intake-stroke and compression-stroke is proportional to oil consumption. The left behind oil during expansion-stroke is also proportional to it. The 2nd land hole was expected to reduce oil consumption because it decreases the 2nd land pressure and stabilized the axial motion of top ring. however, a counter result was obtained at the actual test, so it was found out that the effect of blow-down is significant as well as that of oil film thickness.<br/>