JPH0452455Y2 - - Google Patents
Info
- Publication number
- JPH0452455Y2 JPH0452455Y2 JP12545186U JP12545186U JPH0452455Y2 JP H0452455 Y2 JPH0452455 Y2 JP H0452455Y2 JP 12545186 U JP12545186 U JP 12545186U JP 12545186 U JP12545186 U JP 12545186U JP H0452455 Y2 JPH0452455 Y2 JP H0452455Y2
- Authority
- JP
- Japan
- Prior art keywords
- piston
- ceramic
- heat insulating
- heat
- ceramics
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000000919 ceramic Substances 0.000 claims description 28
- 239000011810 insulating material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000008646 thermal stress Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Landscapes
- Pistons, Piston Rings, And Cylinders (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は熱機関のピストンに適用される断熱セ
ラミツクスピストンに関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a heat insulating ceramic piston applied to a piston of a heat engine.
従来の断熱セラミツクスピストンは、第４図に
示すようにピストン触火面の全面にセラミツクス
を溶射していた。
In conventional heat-insulating ceramic pistons, ceramics are thermally sprayed over the entire surface of the piston contact surface, as shown in FIG.
ところが触火面の全面にセラミツクスを溶射し
た第４図の従来形断熱ピストンは、高温燃焼ガス
からの受熱により高温となり熱膨張する。この
時、断熱材料のセラミツクスとピストンクラウン
の母材との熱膨張率の差からセラミツクスに亀裂
が発生、進展し、終にはセラミツクスの断熱層が
はく離し、断熱セラミツクスピストンの信頼性が
問題となつている。
However, the conventional heat insulating piston shown in FIG. 4, in which ceramics are thermally sprayed on the entire contact surface, becomes hot and expands thermally due to heat received from the high temperature combustion gas. At this time, cracks occur in the ceramic due to the difference in the coefficient of thermal expansion between the heat insulating material ceramic and the base material of the piston crown, and eventually the ceramic heat insulating layer peels off, causing problems in the reliability of the heat insulating ceramic piston. It's summery.
本考案の目的は前記従来装置の問題点を解消
し、断熱材料のセラミツクスが亀裂又ははく離す
ることなく、信頼性が高く高効率の断熱セラミツ
クスピストンを提供するにある。 The object of the present invention is to solve the problems of the conventional devices and to provide a highly reliable and highly efficient insulating ceramic piston without cracking or peeling of the ceramic material.
本考案の断熱セラミツクスピストンはピストン
触火面に複数個の円形の凹みを削設し、該凹みに
断熱材料であるセラミツクスを溶射する。
In the heat insulating ceramic piston of the present invention, a plurality of circular depressions are cut in the contact surface of the piston, and ceramic, which is a heat insulating material, is thermally sprayed into the depressions.
なお前記凹みを削設する際ピストンクラウン表
面を冷却するためのボアクール穴位置と前記凹み
とが重複しないように凹みの位置を設定し、ピス
トンクラウン表面の熱影響を均一化させることを
特徴としている。 In addition, when cutting the recess, the position of the recess is set so that the position of the bore cool hole for cooling the piston crown surface does not overlap with the recess, thereby uniformizing the thermal influence on the piston crown surface. .
ピストン触火面に断熱材料としてセラミツクス
を小円形状に部分的に多数溶射することにより、
該セラミツクスの熱応力作用の害を除去を目的と
している。また熱影響の大きい個所に円形の凹み
を削設し、害凹みにセラミツクスを溶射すること
により断熱効果を高めかつ断熱材料のセラミツク
スとピストンクランク母材との溶着面積を増加し
て付着力の強化をはかりセラミツクスのはく離を
防止している。
By spraying a large number of small circles of ceramics as a heat insulating material on the piston contact surface,
The purpose is to eliminate the harmful effects of thermal stress on the ceramics. In addition, circular depressions are cut in areas that are highly affected by heat, and ceramics are sprayed into the damage depressions to enhance the insulation effect and increase the welding area between the ceramic insulation material and the piston crank base material to strengthen adhesion. This prevents the ceramic from peeling off.
以下第１〜２図、第３図を参照し本考案の実施
例について説明する。
Embodiments of the present invention will be described below with reference to FIGS. 1-2 and 3.
第３図はセラミツクス２をピストンクラウンの
表面に部分的に分割して、スポツト的に溶射する
ことによりセラミツクス２の熱応力を除去し、亀
裂発生の害を防止するようにしたものである。そ
の結果亀裂は防止されるが、セラミツクス２とピ
ストンクラウン母材の熱膨張率が異なるため、両
者の溶着面積の少ない第３図の場合には暫々はく
離が発生する。よつて第１〜２図に示すようにボ
アクール穴３の位置と重複しないように、ピスト
ン触火面に凹み４を削設し、該凹みにセラミツク
ス２を溶射することにより溶着面積を増加しはく
離を防止する。 In FIG. 3, the ceramic 2 is partially divided on the surface of the piston crown and thermally sprayed in spots to remove thermal stress from the ceramic 2 and prevent the occurrence of cracks. As a result, cracks are prevented, but since the coefficients of thermal expansion of the ceramic 2 and the piston crown base material are different, peeling occurs for a while in the case of FIG. 3, where the welded area of both is small. Therefore, as shown in Figures 1 and 2, a recess 4 is cut in the piston contact surface so as not to overlap with the position of the bore cool hole 3, and ceramics 2 are thermally sprayed into the recess to increase the welding area and remove the peeling. prevent.
なお触火面に削設する際ボアクール穴位置を避
けているのは、ピストンクラウン表面の熱影響を
均一化するとともに、ピストン強度の弱化を防止
するのを目的としている。 The purpose of avoiding the bore cool hole position when cutting the contact surface is to equalize the heat effect on the piston crown surface and to prevent the piston strength from weakening.
本考案は前記のとおり構成したので、熱機関の
運転中に断熱材料のセラミツクスが亀裂やはく離
を発生することのない信頼性の高いセラミツクス
ピストンが得られ、高熱効率の内燃機関が提供で
きる。
Since the present invention is configured as described above, it is possible to obtain a highly reliable ceramic piston in which the ceramic as a heat insulating material does not crack or peel during operation of a heat engine, and to provide an internal combustion engine with high thermal efficiency.
第１〜２図は本考案に係る断熱セラミツクスピ
ストンの断面図で第１図は縦断面図、第２図は上
面図、第３図は第１〜２図に示す本考案に至る途
中の断熱セラミツクスの構成を示す断面図、第４
図は従来形断熱セラミツクスピストンの構成を示
す断面図である。
１……ピストン、２……セラミツクス、３……
ボアクール穴、４……凹み。
Figures 1 and 2 are cross-sectional views of the heat insulating ceramic piston according to the present invention. Figure 1 is a longitudinal cross-sectional view, Figure 2 is a top view, and Figure 3 is a heat insulating material on the way to the present invention shown in Figures 1 and 2. Cross-sectional view showing the structure of ceramics, No. 4
The figure is a sectional view showing the structure of a conventional heat insulating ceramic piston. 1... Piston, 2... Ceramics, 3...
Boa cool hole, 4...dent.
Claims (1)
アクール穴位置３に重複しないように設け、該凹
みにセラミツクスを溶射したことを特徴とする断
熱セラミツクスピストン。 A heat-insulating ceramic piston characterized in that a plurality of circular recesses 4 are provided on the contact surface of the piston so as not to overlap with the bore cool hole positions 3, and ceramic is sprayed onto the recesses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12545186U JPH0452455Y2 (en) | 1986-08-19 | 1986-08-19 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12545186U JPH0452455Y2 (en) | 1986-08-19 | 1986-08-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6331241U JPS6331241U (en) | 1988-02-29 |
| JPH0452455Y2 true JPH0452455Y2 (en) | 1992-12-09 |
Family
ID=31018366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12545186U Expired JPH0452455Y2 (en) | 1986-08-19 | 1986-08-19 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0452455Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008286178A (en) * | 2007-05-21 | 2008-11-27 | Toyota Motor Corp | Piston for internal combustion engine and manufacturing method thereof |
-
1986
- 1986-08-19 JP JP12545186U patent/JPH0452455Y2/ja not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008286178A (en) * | 2007-05-21 | 2008-11-27 | Toyota Motor Corp | Piston for internal combustion engine and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6331241U (en) | 1988-02-29 |
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