【図面の簡単な説明】[Brief explanation of the drawing]
第１図は本考案のピストン構造を示すピストン
のピストンリング部分の要部断面図、第２図は本
考案のピストンの第２ランド部の形状の一例を示
すピストン本体の部分側面図、第３図は本考案の
ピストンの第２ランド部の形状の別の例を示すピ
ストン本体の部分側面図、第４図は本考案の圧力
リングに施すテーパ角度を変化させた時の潤滑油
消費量特性を示す線図、第５図は本考案の圧力リ
ングの捩れ角度を変化させた時の潤滑油消費量お
よびブローバイガス量特性を示す線図、第６図は
本考案のピストンのトツプランド幅を変化させた
時の摩擦損失特性を示す線図、第７図は本考案の
ピストンの第２ランド幅を変化させた時の摩擦損
失特性を示す線図、第８図Ａ〜Ｄは従来の圧力リ
ングの形状を示す部分断面図、第８図Ｅは本考案
の圧力リングの形状を示す部分断面図、第８図Ｆ
は従来の第２ランド部の形状を備えたピストンの
部分側面図、第８図Ｇ，Ｈは本考案の第２ランド
部の形状を備えたピストン本体の部分側面図、第
９図は第８図の圧力リング２とピストン本体との
各種組合せによる潤滑油消費量の違いを示すグラ
フ図である。
１……ピストン、２……圧力リング、３……油
かきリング、４……トツプリング、５……第２リ
ング、Ｐ……段状切欠環状部（油溜り）、Ｑ……
凹溝部（油溜り）。
FIG. 1 is a sectional view of a main part of a piston ring portion of a piston showing a piston structure of the present invention, FIG. 2 is a partial side view of a piston body showing an example of the shape of a second land portion of a piston of the present invention, and FIG. The figure is a partial side view of the piston body showing another example of the shape of the second land portion of the piston of the present invention, and Figure 4 shows the lubricating oil consumption characteristics when changing the taper angle of the pressure ring of the present invention. Figure 5 is a diagram showing the lubricating oil consumption and blow-by gas amount characteristics when the torsion angle of the pressure ring of the present invention is changed, Figure 6 is a diagram showing the characteristics of the toppled land width of the piston of the present invention. Fig. 7 is a diagram showing the friction loss characteristics when the second land width of the piston of the present invention is changed, and Fig. 8 A to D are diagrams showing the friction loss characteristics when changing the second land width of the piston of the present invention. Fig. 8E is a partial sectional view showing the shape of the pressure ring of the present invention, Fig. 8F is a partial sectional view showing the shape of the pressure ring of the present invention.
8 is a partial side view of a piston with a conventional second land shape, FIGS. 8G and H are partial side views of a piston body with a second land shape of the present invention, and FIG. It is a graph figure which shows the difference in lubricating oil consumption by various combinations of the pressure ring 2 of a figure, and a piston main body. 1...Piston, 2...Pressure ring, 3...Oil paddle ring, 4...Top ring, 5...Second ring, P...Stepped notched annular portion (oil reservoir), Q...
Concave groove (oil sump).