JPS5874853A - Piston head - Google Patents
Piston headInfo
- Publication number
- JPS5874853A JPS5874853A JP17853582A JP17853582A JPS5874853A JP S5874853 A JPS5874853 A JP S5874853A JP 17853582 A JP17853582 A JP 17853582A JP 17853582 A JP17853582 A JP 17853582A JP S5874853 A JPS5874853 A JP S5874853A
- Authority
- JP
- Japan
- Prior art keywords
- piston
- piston cap
- head
- curvature radius
- head body
- 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.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/10—Pistons having surface coverings
- F02F3/12—Pistons having surface coverings on piston heads
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、例えばレシプロエンジンに用いられるピスト
ンヘッドに関す乞。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piston head used, for example, in a reciprocating engine.
従来から、レシプロエンジンのような内燃機関のピスト
ンヘッドにおいては、金属製のヘッド本体の頂部に、熱
伝導性が低く耐熱性の良いセラミック焼結体よりなるヘ
ッドキャップを設け、エンジンの作動工程中の熱損失を
減少させ出力アップやハイドロカーボンの排出量の低減
或いは燃費の減少を図ることが行なわれている。Traditionally, in the piston head of an internal combustion engine such as a reciprocating engine, a head cap made of a ceramic sintered body with low thermal conductivity and good heat resistance is provided on the top of the metal head body, and the head cap is made of a ceramic sintered body with low thermal conductivity and good heat resistance. Efforts are being made to reduce heat loss in the engine to increase output, reduce hydrocarbon emissions, or reduce fuel consumption.
而して、上記のヘッドキャップとしては種々の形状のも
のが用いられているが、底部に凹凸が設けられているも
のの場合、そのコーナーの部分の機械的強度が低く、応
力集中によりクラックを生じやすいという欠点があった
・また、このようなヘッドキャップのヘッド本体への固
着は、いわゆる鋳込み法により行なわれることが多いが
、この場合には、セラミック材の118#張串が金属に
比べて極めて小さいため鋳込み後金属材が冷却固化する
際に、セラミック材が強く圧縮されて、特に角部にクラ
ンクを生じたり、或いはクラックを生じなくとも、圧縮
応力がセラミック材の特にこの角部に残留し機械的強度
が著るしく低下してしまうという欠点かあった。Various shapes are used as the above-mentioned head caps, but in the case of a head cap with an uneven bottom, the mechanical strength of the corner portion is low and cracks may occur due to stress concentration. In addition, such head caps are often fixed to the head body by the so-called casting method, but in this case, 118# ceramic skewers are easier to attach than metal. Because it is extremely small, when the metal material cools and solidifies after casting, the ceramic material is strongly compressed, causing cranks, or even if no cracks occur, compressive stress remains in the ceramic material, especially in these corners. However, the disadvantage was that the mechanical strength was significantly reduced.
本発明はこれらの欠点を解消するためになされたもので
、セラミック焼結体からなるピストンキャップの、ピス
トンヘッド本体との当接面を含む外周面の角部を1曲面
状に面取り加工して成ることを特徴とするピストンヘッ
ドを提供しようとするものである。The present invention was made in order to eliminate these drawbacks, and the corners of the outer peripheral surface of the piston cap made of a ceramic sintered body, including the contact surface with the piston head body, are chamfered into a single curved shape. It is an object of the present invention to provide a piston head characterized by the following features.
本発明のピストンキャップを構成するセラミック焼結体
としては、Si、N、、AIN、TiN、ZrN のよ
うな窒化物、8i、ON、、8iiJONのような酸窒
化物、8i0.B、O,Tie、Zreのような炭化物
、A7 璽0− %Z rO−1MjAJ、0゜のよう
な酸化物、8i−N−−8i0のような炭室化物の焼結
体の他、MA8 (M y−AA!−8i )糸やLA
S(Ij−AI−8i)系のガラスセラミックス勢があ
る。The ceramic sintered body constituting the piston cap of the present invention includes nitrides such as Si, N, AIN, TiN, ZrN, oxynitrides such as 8i, ON, 8iiJON, 8i0. In addition to carbides such as B, O, Tie, and Zre, oxides such as A7 0-%Z rO-1MjAJ, 0°, and carbide sintered bodies such as 8i-N--8i0, MA8 (My-AA!-8i) Yarn and LA
There are S (Ij-AI-8i) type glass ceramics.
本発明ζこ右いては、これらのセラミック焼結体からな
るピストンキャップの外細面の角部を全て曲面状に面取
り加工するが、その曲面の1串半径は、小さすぎると面
取りの効果がなく、反対に大きすぎるとヘツ、ド十体等
との接合間隙が大きくなりすぎ、固定金属との接触面積
が少なくなり、セラミック同定の機能が失われる原因と
なるので、0,5〜5Mの範囲にすることが好ましい。According to the present invention, all the corners of the outer thin surface of the piston cap made of these ceramic sintered bodies are chamfered into a curved shape, but if the radius of one skewer of the curved surface is too small, the chamfering effect will be lost. On the other hand, if it is too large, the bonding gap with the head, dowel, etc. will become too large, the contact area with the fixed metal will decrease, and the function of ceramic identification will be lost, so the range of 0.5 to 5 M. It is preferable to
また、このピストンキャップのヘッド本体との当接面は
、1〜208の表面粗度になるように研磨することが望
ましい。この場合は、潤滑油の保持性が向上するばかり
でなく、内燃機関全体の燃焼効率も曳くなるという利点
がある〇以下、図面の実施例に基づいて本発明をさらに
詳細に説明する。Further, it is desirable that the contact surface of the piston cap with the head body be polished to a surface roughness of 1 to 208. In this case, there is an advantage that not only the retention of lubricating oil is improved but also the combustion efficiency of the entire internal combustion engine is improved.Hereinafter, the present invention will be explained in more detail based on the embodiments shown in the drawings.
第1図から第4図は本発明のピストンヘッドの断面図で
ある。第1図において、金属製のピストンヘッド本体l
と前記セラミック焼結体からなるピストンキャップ2と
の当接面を含む外周面の角部は、いずれも曲面状に面取
り加工されている。1 to 4 are cross-sectional views of the piston head of the present invention. In Figure 1, the metal piston head body l
The corners of the outer circumferential surface, including the abutting surfaces between the piston cap 2 and the piston cap 2 made of the ceramic sintered body, are all chamfered into curved shapes.
尚、第2図および第3図において3は、金属製のリング
を示す◎
第2図の実施例、ではこの金属製リング3を止具4によ
りヘッド本体lに止着することによって、ピストンキャ
ップ2が固設され、第3図の実施例においては、金属性
リング3は焼嵌めにより、キャップ2詔よびヘッド本体
1の外側に嵌着されている。In addition, in FIGS. 2 and 3, 3 indicates a metal ring ◎ In the embodiment shown in FIG. In the embodiment shown in FIG. 3, a metal ring 3 is fitted onto the cap 2 and the outside of the head body 1 by shrink fitting.
また、第4図に詔いて、5は鋳込み法による結着具を示
す。Further, in FIG. 4, numeral 5 indicates a binding device made by the casting method.
以上のように構成された本発明のピストンヘッドに詔い
ては、セラミック焼結体からなるピストンキャップの外
局面の角部が、曲面状に面識す加工されているので、こ
の部分への熱的機械的な応力集中を避けることができる
。In the piston head of the present invention constructed as described above, the corners of the outer surface of the piston cap made of a ceramic sintered body are processed to face each other in a curved shape, so that thermal radiation to these parts is reduced. Mechanical stress concentration can be avoided.
また、金属製のヘッド本体との間に多少の間隙が保たれ
るので、この部分の断熱効果は大きく、さらに金属の熱
膨張をこの間隙が吸収し、キャップへの圧縮力の波及を
防ぐことができるという利点がある。In addition, since a slight gap is maintained between the metal head body and the head body, this part has a large insulation effect, and this gap absorbs the thermal expansion of the metal, preventing the spread of compressive force to the cap. It has the advantage of being able to
第1図からl[4図までは、本発明の実施例の断面図で
ある。
1・・・ピストンヘッド本体
2・・・ピストンキャップ
3・・・金属製リング
4・・・止着具
5・・・結着具
(7317)憚臥弁理士 則近憲佑
(ほか1名)
第1図
第2図
第3図
第4図Figures 1 to 4 are cross-sectional views of embodiments of the present invention. 1... Piston head body 2... Piston cap 3... Metal ring 4... Fastening tool 5... Binding tool (7317) Kengo Patent Attorney Norichika Kensuke (and 1 other person) Figure 1 Figure 2 Figure 3 Figure 4
Claims (1)
、もしくは平板上のセラミック焼結体製ピストンキャッ
プを固着して成るピストンヘッドに右いて、ピストンキ
ャップの、前記ヘッド本体との当接面を含む外崗面の角
部を、曲面状に面取り加工して成ることを特徴とするピ
ストンヘッド。A piston head consisting of a ceramic sintered piston cap having a bowl-shaped cross section, an inverted bowl shape, or a flat plate is fixed to the top of a metal piston head body, and the piston cap is in contact with the head body. A piston head characterized in that the corners of the outer granite surface including the surface are chamfered into a curved shape.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17853582A JPS5874853A (en) | 1982-10-13 | 1982-10-13 | Piston head |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17853582A JPS5874853A (en) | 1982-10-13 | 1982-10-13 | Piston head |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5874853A true JPS5874853A (en) | 1983-05-06 |
Family
ID=16050169
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17853582A Pending JPS5874853A (en) | 1982-10-13 | 1982-10-13 | Piston head |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5874853A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3506069A1 (en) * | 1984-02-28 | 1985-09-12 | NGK Insulators Ltd., Nagoya, Aichi | MACHINE PART FOR AN INTERNAL COMBUSTION ENGINE AND METHOD FOR THE PRODUCTION THEREOF |
US4648308A (en) * | 1984-03-12 | 1987-03-10 | Ngk Insulators, Ltd. | Internal combustion engine piston and a method of producing the same |
CN102619640A (en) * | 2012-04-10 | 2012-08-01 | 无锡工艺职业技术学院 | Ceramic sheathed internal combustion engine piston and manufacturing method thereof |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5395415A (en) * | 1976-12-30 | 1978-08-21 | Cummins Engine Co Inc | Adiabatic combined piston |
-
1982
- 1982-10-13 JP JP17853582A patent/JPS5874853A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5395415A (en) * | 1976-12-30 | 1978-08-21 | Cummins Engine Co Inc | Adiabatic combined piston |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3506069A1 (en) * | 1984-02-28 | 1985-09-12 | NGK Insulators Ltd., Nagoya, Aichi | MACHINE PART FOR AN INTERNAL COMBUSTION ENGINE AND METHOD FOR THE PRODUCTION THEREOF |
US4667627A (en) * | 1984-02-28 | 1987-05-26 | Ngk Insulators, Ltd. | Engine parts and method of producing the same |
US4648308A (en) * | 1984-03-12 | 1987-03-10 | Ngk Insulators, Ltd. | Internal combustion engine piston and a method of producing the same |
CN102619640A (en) * | 2012-04-10 | 2012-08-01 | 无锡工艺职业技术学院 | Ceramic sheathed internal combustion engine piston and manufacturing method thereof |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS60180969A (en) | Engine part and manufacture | |
JPS63289306A (en) | Manufacture of sliding part | |
US4709621A (en) | Internal combustion engine piston and a method of producing the same | |
JPH0467580B2 (en) | ||
JPS5874853A (en) | Piston head | |
JPS6224018Y2 (en) | ||
JPH02104950A (en) | Piston for internal combustion engine | |
JPS5874811A (en) | Cam for internal-combustion engine | |
JPS59110328U (en) | Diesel engine secondary combustion chamber | |
JPS6058824U (en) | Insulation structure of engine combustion chamber wall | |
JPH072979Y2 (en) | Secondary combustion chamber of internal combustion engine | |
JPH0529579Y2 (en) | ||
JPS6343363Y2 (en) | ||
JPH0133802Y2 (en) | ||
JPS60105845U (en) | internal combustion engine piston | |
JPS61159645U (en) | ||
JPS6129040U (en) | internal combustion engine piston | |
JPS6139451U (en) | piston | |
JPS643794Y2 (en) | ||
JPS60114229U (en) | Diesel engine with auxiliary combustion chamber | |
JPS59175631U (en) | Ceramic chamber for swirl chamber type diesel engine | |
JPS62137359U (en) | ||
JPH0350103B2 (en) | ||
JPH036040U (en) | ||
JPS60100527U (en) | Ceramic secondary combustion chamber structure |