JPH0444455U

JPH0444455U -

Info

Publication number: JPH0444455U
Application number: JP8456290U
Authority: JP
Priority date: 1990-08-13
Filing date: 1990-08-13
Publication date: 1992-04-15

Description

[Brief explanation of the drawing]

第１図はこの考案によるセラミツク製ピストン
リングを持つピストンの実施例を示す説明図、第
２図はセラミツク製ピストンリングの一実施例を
示す断面図、第３図は第２図の平面図、第４図は
セラミツク製ピストンリングの別の実施例を示す
断面図、第５図はセラミツク製ピストンリングと
金属製ピストンリングの温度と合い口すきまの関
係を示すグラフ、第６図はピストンリングを持つ
ピストンとシリンダの関係を示す説明図、第７図
は第６図のピストンリングの合い口における断面
図、第８図は従来の基本的なピストンリングを示
す平面図、第９図は従来の基本的なピストンリン
グの応力分布を示す説明図、第１０図は第８図の
ピストンリングの断面図、及び第１１図は第９図
のピストンリングの合い口の反対側の部分に掛か
る応力分布を示す説明図である。１……セラミツク製ピストンリング、２……金
属製ピストンリング、３，３Ｓ，３Ｍ……合い口
、４……燃焼室、５……ピストン、６，７，１５
……ピストンリング溝、８……シリンダライナ、
９……摺動面、１０……ピストンリング、１１…
…セラミツク製リング部分、１２……金属製リン
グ部分、１３……ダンピング部材、１４……下面
、１７……上面、１８……環状段部、１９……内
周面、２０……外周面、Ｃ……合い口すきま、Ｌ
……自由合い口すきま。 Fig. 1 is an explanatory diagram showing an embodiment of a piston having a ceramic piston ring according to this invention, Fig. 2 is a sectional view showing an embodiment of a ceramic piston ring, Fig. 3 is a plan view of Fig. 2, Fig. 4 is a sectional view showing another example of a ceramic piston ring, Fig. 5 is a graph showing the relationship between the temperature and the gap between the ceramic piston ring and the metal piston ring, and Fig. 6 is a graph showing the relationship between the temperature and the gap between the ceramic piston ring and the metal piston ring. An explanatory diagram showing the relationship between the piston and the cylinder, Fig. 7 is a sectional view at the piston ring joint in Fig. 6, Fig. 8 is a plan view showing a conventional basic piston ring, and Fig. 9 is a conventional An explanatory diagram showing the basic stress distribution of a piston ring, Fig. 10 is a cross-sectional view of the piston ring of Fig. 8, and Fig. 11 is a stress distribution applied to the part opposite to the piston ring abutment of Fig. 9. FIG. 1... Ceramic piston ring, 2... Metal piston ring, 3, 3S, 3M... Joint, 4... Combustion chamber, 5... Piston, 6, 7, 15
... Piston ring groove, 8 ... Cylinder liner,
9...Sliding surface, 10...Piston ring, 11...
... Ceramic ring part, 12 ... Metal ring part, 13 ... Damping member, 14 ... Bottom surface, 17 ... Top surface, 18 ... Annular step part, 19 ... Inner peripheral surface, 20 ... Outer peripheral surface, C...Gap gap, L
...Free joint gap.

Claims

[Claims for Utility Model Registration] (1) A piston ring made of ceramic with a low coefficient of thermal expansion, which is arranged in a piston ring groove located on the combustion chamber side and has a characteristic that the gap becomes small at low temperatures; A piston having a ceramic piston ring that is arranged in an adjacent piston ring groove and has a metal piston ring that has a characteristic that the gap becomes smaller at high temperatures. (2) The ceramic piston ring includes a first ring portion made of ceramic with a low coefficient of thermal expansion, which is located on the combustion chamber side in the piston ring groove and has a characteristic that the abutment becomes small at low temperatures, and the first ring Claim 1 comprising a second ring part made of metal, which is adjacent to the second ring part and has a characteristic that the abutment becomes smaller at high temperatures.
A piston with a ceramic piston ring as described in . (3) A piston having a ceramic piston ring according to claim 2, wherein the abutment of the first ring portion and the abutment of the second ring portion are set at different positions in the circumferential direction. (4) The piston having a ceramic piston ring according to claim 1, which is used for a cylinder or cylinder liner whose sliding surface is made of a metal material.