JPS5971939U

JPS5971939U - Piston for internal combustion engine

Info

Publication number: JPS5971939U
Application number: JP13963683U
Authority: JP
Inventors: パウル・ロツテンコルベル
Original assignee: フオルクスウア−ゲンウエルク・アクチエンゲゼルシヤフト
Priority date: 1982-09-10
Filing date: 1983-09-10
Publication date: 1984-05-16
Also published as: JPH0141878Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【図面の簡単な説明】第１図は板状の中実のセラミック挿入物を有するピスト
ンの縦断面図であり、第２図は中空体の挿入物を有する
ピストンの縦断面図であり、第３図は挿入物をリングと
して形成した別の実施例の縦断面図であり、第４図は挿
入物を偏心して設けた場合の更に別の実施例の平面図で
あり、第５図は挿入物を特殊形状に構成した実施例の縦
断面図である。図中参照番号の説明、１・・・・・・ピストン、２・・
・・・・ピストン頂部、３．　３ａ、　　３ｂ、　　３
Ｃ，３ｄ、　　３ｅ−・・・・・挿入物。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a piston with a plate-shaped solid ceramic insert, FIG. 2 is a longitudinal sectional view of a piston with a hollow body insert, and FIG. 3 is a longitudinal sectional view of another embodiment in which the insert is formed as a ring, FIG. 4 is a plan view of still another embodiment in which the insert is provided eccentrically, and FIG. FIG. 2 is a longitudinal cross-sectional view of an embodiment in which an object is configured into a special shape. Explanation of reference numbers in the figure: 1...piston, 2...
... Piston top, 3. 3a, 3b, 3
C, 3d, 3e-...Insert.

Claims

[Scope of utility model registration request]

(1) A piston for an internal combustion engine having an insert of ceramic material held in the metal piston bottom by casting, using as the ceramic material for the insert 3 a material that satisfies the following equation: Eiso (αUG-α1so)'HaT・Dis. ≦0°45 In this case, ΔT is the temperature difference between the curing temperature of the metal material of the piston bottom 2 and the atmospheric temperature, Eiso is the elastic modulus of the ceramic material of the insert, and αiso is the thermal expansion of the ceramic material. A piston for an internal combustion engine, characterized in that αDiso is a compressive strength of a ceramic material, and αD is a coefficient of thermal expansion of a metal material of the piston bottom portion 2.

(2) The ratio of the outer diameter d of the metal piston bottom 2 to the outer diameter d of the ceramic material insert is da15o・△T(
"tJG-α1so) E is. ding〉10□-Wataru" σ0.2 mountain・<1-di> In this case, σ0.2.x: is the σ0. of the metal material of the piston bottom 2.
2 stress, and dl indicates the inner diameter of the insert, as claimed in claim (1).

(3) Scope of claims for utility model registration, paragraph (1) or paragraph (
In the piston described in item 2), when the ceramic insert 3d is eccentrically provided on the piston bottom 2, the minimum distance from the piston edge (h'm1n) to the insert edge is ``piston diameter d'', and the ceramic insert 3d is eccentrically provided. be at least 20% of the difference between the maximum possible outer diameter d of the ceramic insert, i.e. h, >0.2·(da-d), t%
A piston characterized by:

(4) Any one of the preceding claims for utility model registration, characterized in that the ceramic insert 3 has a rotationally symmetrical outer shape, the originating end of which includes a tangent line parallel to the rotationally symmetrical axis 10. The piston described in section.

(5) Claims for registration of a utility model characterized in that the starting edge of the outer shape of the ceramic insert 3 has a tangent 8 oriented at right angles to the axis of rotational symmetry 10 and touching at one point 6 The piston according to item (4).

(6) Scope of Utility Model Registration Claims Having an Insert Formed as a Hollow Body In the piston described in any of the preceding paragraphs, the center generation line 9 at the center of the inner and outer dimensions of the insert 3e is aligned with the rotation axis 10. In the near area of , there is a return ridge R beyond the deepest position within a range of at most 2/3 of the average diameter width of the inserted number, and the ridge R is at most 1/3 of the wall thickness S of the return ridge. A piston characterized by being removed in the range.