JPS6093161A - Heat-insulated piston structure - Google Patents
Heat-insulated piston structureInfo
- Publication number
- JPS6093161A JPS6093161A JP20046683A JP20046683A JPS6093161A JP S6093161 A JPS6093161 A JP S6093161A JP 20046683 A JP20046683 A JP 20046683A JP 20046683 A JP20046683 A JP 20046683A JP S6093161 A JPS6093161 A JP S6093161A
- Authority
- JP
- Japan
- Prior art keywords
- piston body
- crown
- projection
- receiving hole
- piston
- 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.)
- Granted
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
- F02F3/0015—Multi-part pistons
-
- 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
-
- 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
- F02F2200/00—Manufacturing
- F02F2200/04—Forging of engine parts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/02—Light metals
- F05C2201/021—Aluminium
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】
本発明は断熱エンジンに供される断熱ピストンの構造に
関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of an adiabatic piston used in an adiabatic engine.
エンジンの燃焼室を囲む壁部にセラミクスを用いること
によって燃焼ガスの外部放散を防ぎ、高温の状態で排気
ガスを排気ターボ過給機などの前回ＩＩ？装置へ送り出
し、これによって機関の出力増大と熱効率の向上を図る
ようにした断熱エンジンが既に提案されている。By using ceramics in the wall surrounding the combustion chamber of the engine, the combustion gas is prevented from dissipating to the outside, and the exhaust gas is exhausted under high temperature conditions. An adiabatic engine has already been proposed in which the engine is fed to a device, thereby increasing the output and improving the thermal efficiency of the engine.
断熱エンジンのピストンは、アルミニウムなどのピスト
ン本体とセラミクスからなるクラウンとを耐熱性を有す
るボルトなどで締結するかまたは詩ぐるみ法によって結
合するのが一般的である。In the piston of an adiabatic engine, a piston body made of aluminum or the like and a crown made of ceramic are generally fastened together using heat-resistant bolts or the like, or by the cylindrical method.
しかし、ポルｌ〜による締結では熟サイクルや燃焼圧の
変動によって弛みが発生し、また鋳くるんだものでは熱
応力により破壊される恐れがあり、まだ実用の城に達し
ていない。However, when fastening with POL~, loosening occurs due to aging cycles and fluctuations in combustion pressure, and cast-wrapped ones may break due to thermal stress, so they have not yet reached a level of practical use.
また、特開昭５７−２４４５号公報に示すように、ピス
トンについて燃焼室を区画するクラウンにセラミクスを
用いたものが提案されているが、これはアルミニウムな
どからなるピストン本体との結合構造が複雑であり、ぞ
の帽イ」けに手数と時間がｌトる。Furthermore, as shown in Japanese Patent Application Laid-Open No. 57-2445, a piston using ceramics for the crown that partitions the combustion chamber has been proposed, but this requires a complicated connection structure with the piston body made of aluminum or the like. However, it takes a lot of effort and time to do so.
本発明の目的は、構成および組（４けが簡単でｉ産に適
した断熱ピストンの構造を提供することにある。An object of the present invention is to provide a structure of an insulating piston that is simple in construction and assembly and suitable for industrial use.
このため、本発明の構成はピストン本体の上端部に嵌合
穴を設け、該嵌合穴にクラウンに形成した突部を嵌合し
、前記ピストン本体の嵌合穴周囲を加熱加圧し、ピスト
ン本体とクラウンとを接合したものである。For this reason, the configuration of the present invention is such that a fitting hole is provided at the upper end of the piston body, a protrusion formed on the crown is fitted into the fitting hole, and the area around the fitting hole of the piston body is heated and pressurized. The main body and the crown are joined together.
本発明を実施例に基づいて説明する。第１図に示づＪ、
うに、本発明にＪ：るピストン目スノＪ−１〜部を含む
ピストン本体２と、この、１一端部に結合される窒化珪
素などのセラミクスからなるクラウン１とを勾いに結合
して構成される。ピストン本体２はアルミニウムま／、
：Ｉ；１ ｉ４鍛ｕ鉄によって構成され、この外周面に
リンク満１０．１１．１２が削設される。そして、上端
部に嵌合穴１５が設けられるとともに、周壁には公知の
ピストンピンを嵌合するピン穴１３が股１らｌ’ｌる。The present invention will be explained based on examples. J shown in Figure 1,
According to the present invention, a piston main body 2 including a piston eye socket J-1 and a crown 1 made of ceramics such as silicon nitride connected to one end of the piston main body 2 are joined in an inclined manner. be done. The piston body 2 is made of aluminum.
:I;1 It is constructed of I4 forged U iron, and links 10, 11, and 12 are cut into the outer peripheral surface. A fitting hole 15 is provided at the upper end, and a pin hole 13 into which a known piston pin is fitted is provided from the crotch 1 in the peripheral wall.
クラウン１σ月一端而１１平坦であり、下端部の周縁部
にビスト２本１４２の１−縁部にリング４を介して重合
される突条１９ ／Ｊ”８’Ｕ Ｌｔられるとともに、
中央部に燃焼室９をト画【、１、かつ下方ｌ＼突出４る
突部５が一体に形成される。そして、この突部５がビス
（−ン本体２の嵌合穴１！：ｉにｈｙ＋自されるととも
に、突条１９と突部５との間の空部にセラミクスファイ
バまたはステン１ノスメッシ］からなる断熱材３が挾ま
れる。The crown 1σ is flat at one end and 11 is flat, and a protrusion 19 is attached to the periphery of the lower end of the two screws 142 and is overlapped with the edge of the ring 4 through the ring 4.
A protrusion 5 that defines a combustion chamber 9 and projects downward is integrally formed in the center. Then, this protrusion 5 is screwed into the fitting hole 1 of the main body 2, and a ceramic fiber or stainless steel mesh is inserted into the space between the protrusion 19 and the protrusion 5. The heat insulating material 3 is sandwiched.
リング４はピストン本体２の、Ｅ端部に形成（）た環状
溝に係合される。断熱材３と１ノではセラミクスファイ
バまたはステンレス細線を編成するか、または絡み合せ
て形成したものを用いる。The ring 4 is engaged with an annular groove formed at the E end of the piston body 2. The heat insulating materials 3 and 1 are formed by knitting or intertwining ceramic fibers or stainless steel wires.
本発明では特に突部５の外周面の而粗ざを予め粗く成形
しておき、これをビス１ヘン本体２の嵌合穴１５に嵌合
したうえ、第２図に示すように、ピストン本体２の内端
壁２ａの突部５に接近する部分をダイス６をもって加熱
加圧し、これによって突部５との嵌合部を緊密に圧接さ
せる。このダイス６は圧縮荷重に耐える好ましくはセラ
ミクスから形成されるカップ状のもので、予め適当な手
段により加熱したうえ、下端部６ａをピストン本体２の
内＠’Ｉ！２ａに強く押付けて、ピストン本体２の上段
部の壁部を変形させ、嵌合穴１５に対する突部５の嵌合
部を密接させる。ダイス６は加熱が終っても加圧状態を
維持しつつ冷却し、事後の熱膨張による弛みの発生を防
止する。In the present invention, in particular, the outer circumferential surface of the protrusion 5 is formed in advance to have a rough surface, and this is fitted into the fitting hole 15 of the screw body 2, and as shown in FIG. The portion of the inner end wall 2a of the inner end wall 2a approaching the protrusion 5 is heated and pressurized using a die 6, thereby bringing the fitting portion with the protrusion 5 into tight pressure contact. The die 6 is a cup-shaped die preferably made of ceramics that can withstand compressive loads, and is heated in advance by an appropriate means, and then the lower end 6a is inserted into the piston body 2. 2a to deform the upper wall of the piston body 2 and bring the fitting portion of the protrusion 5 into the fitting hole 15 into close contact. Even after heating, the die 6 is cooled while maintaining the pressurized state to prevent loosening due to subsequent thermal expansion.
ダイス６はカップ状とする代りに、この端部６ａに円周
方向に沿って複数個の突部を設け、これによって嵌合穴
１５と突部５との嵌合部を局部的に加熱変形させるよう
にしてもよい。Instead of having a cup shape, the die 6 is provided with a plurality of protrusions along the circumferential direction on the end portion 6a, whereby the fitting portion between the fitting hole 15 and the protrusion 5 is locally heated and deformed. You may also do so.
クラウン１をピストン本体２に結合ケる場合。When connecting the crown 1 to the piston body 2.
予めピストン本体２を高周波加熱手段などにより金属の
軟化点、炭県＃ＭＣは４００へ一５００°Ｃ１合金鋼で
は６００℃、アルミニウムでは３００℃程度に加熱し、
イの後にダイス６によ′つて加圧する。The piston body 2 is heated in advance by high frequency heating means or the like to the softening point of the metal, MC = 400-500°C, 600°C for 1 alloy steel, and 300°C for aluminum.
After step A, pressure is applied using die 6.
このようにしてピストン本体２の軟化した部分がセラミ
クスからなるクラウン１の突部５に圧着され、かつ加圧
状態で冷ｆＪｌさｈるために、圧検出ノコが残留し、突
Ｎｉ５との結合力が強化される。In this way, the softened portion of the piston body 2 is crimped to the protrusion 5 of the crown 1 made of ceramics, and since it is cooled under pressure, the pressure detection saw remains and the connection with the protrusion Ni5 Power is strengthened.
第３図に承りように、ビス１ヘン本体２とクラウン１の
突部５との嵌合部に（、Ｌ、セラミクスと同等の熱膨張
率を有するコバール（Ｆ ｅ−Ｎ １−Ｃｏ合金）など
の合金からなるリング１Ｂを突部５に外挿１ノ、かつ内
端！１２ａを加熱しながら強く押付けて、内端壁２ａの
内部へ埋入きせるようにすれば、さらに緊密な結合が得
られる。As shown in Fig. 3, the fitting part between the screw body 2 and the protrusion 5 of the crown 1 is made of Kovar (F e-N 1-Co alloy) which has the same coefficient of thermal expansion as ceramics. An even tighter connection can be achieved by inserting a ring 1B made of an alloy such as can get.
なお、燃料が燃焼室９の壁部に向って直接噴射される形
式のティービルエンジンでは、燃料が当る部分のピスト
ンピン
うに、第４図に示づ゛ように、嵌合穴１５に溝２２５−
を設けて、突部５との間に空部を形成することが好まし
い。In addition, in a T-bill engine in which fuel is injected directly toward the wall of the combustion chamber 9, a groove 225 is formed in the fitting hole 15 on the piston pin in the part that is in contact with the fuel, as shown in FIG. - It is preferable to provide a space between the protrusion 5 and the protrusion 5.
本発明は上述のように、従来のボルトや鋳ぐるみによる
手段と異なり、セラミクスからなるクラウン１がアルミ
ニウムなどからなるピストン本体２に嵌合され、かつこ
の嵌合部が機械的に圧接されるものであるから、クラウ
ン１とピストン本体２とのボルトの締め過ぎにより過大
な締付応力が生じたり、鋳ぐるみ時に高温溶融時の内部
応力が生じるなどの従来の不具合を解消することができ
るとともに、構造および組立が簡単であるので農産化が
容易であり、断熱ピストンを安価に提供することができ
る。As mentioned above, the present invention differs from the conventional means using bolts or castings, in that the crown 1 made of ceramics is fitted into the piston body 2 made of aluminum or the like, and this fitting part is mechanically pressure-welded. Therefore, it is possible to eliminate conventional problems such as excessive tightening stress caused by over-tightening the bolt between the crown 1 and the piston body 2, and internal stress caused by high temperature melting during casting. Since the structure and assembly are simple, agricultural production is easy, and the heat insulating piston can be provided at low cost.
第１図は本発明に係る断熱ピストンの構造についての正
面断面図、第２図および第３図は同断熱ピストンの製造
過程を示す正面断面図、第４図は本発明の一部変更実施
例に係る断熱ピストンの構造についての平面断面図であ
る。
６−
１：タラＳ７ン ２：ピストン本体 ３：断熱材５：突
部 １５：嵌合穴
特許出願人 い′１讐自動車株式会社
代叩人 弁理１１１１本俊夫
７一Fig. 1 is a front sectional view of the structure of the heat insulating piston according to the present invention, Figs. 2 and 3 are front sectional views showing the manufacturing process of the heat insulating piston, and Fig. 4 is a partially modified embodiment of the present invention. FIG. 3 is a plan sectional view of the structure of the heat insulating piston according to the invention. 6- 1: Tara S7n 2: Piston body 3: Insulating material 5: Protrusion 15: Fitting hole Patent applicant I'1 Toshio Jidosha Co., Ltd. Patent attorney 1111 Toshio Moto 71
Claims (1)
ウンに形成した突部を嵌合し、前記ビス］〜ン本体の嵌
合穴周囲を加熱加圧し、ビス；−ン本体とクラウンとを
接合したことを特徴とする断熱ビスｉ〜ンの構造A fitting hole is provided at the upper end of the piston body, a protrusion formed on the crown is fitted into the fitting hole, and the area around the fitting hole of the screw body is heated and pressurized to connect it to the screw body. The structure of a heat insulating screw characterized by joining the crown.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20046683A JPS6093161A (en) | 1983-10-26 | 1983-10-26 | Heat-insulated piston structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20046683A JPS6093161A (en) | 1983-10-26 | 1983-10-26 | Heat-insulated piston structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6093161A true JPS6093161A (en) | 1985-05-24 |
| JPH0372830B2 JPH0372830B2 (en) | 1991-11-19 |
Family
ID=16424779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20046683A Granted JPS6093161A (en) | 1983-10-26 | 1983-10-26 | Heat-insulated piston structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6093161A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0155160A2 (en) * | 1984-03-12 | 1985-09-18 | Ngk Insulators, Ltd. | An internal combustion engine piston and a method of producing the same |
| JPS61164449U (en) * | 1985-04-01 | 1986-10-13 | ||
| JPS61275547A (en) * | 1985-05-30 | 1986-12-05 | Kyocera Corp | Piston for direct-injection diesel engine |
| JPS63255551A (en) * | 1987-04-11 | 1988-10-21 | Isuzu Motors Ltd | Heat insulated piston |
| JPS63255553A (en) * | 1987-04-11 | 1988-10-21 | Isuzu Motors Ltd | Heat insulated piston |
| DE102004028459A1 (en) * | 2004-06-11 | 2005-12-29 | Mahle Gmbh | Built piston for internal combustion engine consists of upper part with bearing edge, recess and nose part on bottom and under part shaped to form a shrink fit with upper part thereby joining them together |
| JP2008267205A (en) * | 2007-04-18 | 2008-11-06 | Nishishiba Electric Co Ltd | Piston and oilless compressor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5575977A (en) * | 1978-11-29 | 1980-06-07 | Rosenthal Technik Ag | Bonding body between ceramic member and metal member |
| JPS59179261U (en) * | 1983-05-19 | 1984-11-30 | 日本特殊陶業株式会社 | Piston for internal combustion engine |
-
1983
- 1983-10-26 JP JP20046683A patent/JPS6093161A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5575977A (en) * | 1978-11-29 | 1980-06-07 | Rosenthal Technik Ag | Bonding body between ceramic member and metal member |
| JPS59179261U (en) * | 1983-05-19 | 1984-11-30 | 日本特殊陶業株式会社 | Piston for internal combustion engine |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0155160A2 (en) * | 1984-03-12 | 1985-09-18 | Ngk Insulators, Ltd. | An internal combustion engine piston and a method of producing the same |
| JPS61164449U (en) * | 1985-04-01 | 1986-10-13 | ||
| JPS61275547A (en) * | 1985-05-30 | 1986-12-05 | Kyocera Corp | Piston for direct-injection diesel engine |
| JPS63255551A (en) * | 1987-04-11 | 1988-10-21 | Isuzu Motors Ltd | Heat insulated piston |
| JPS63255553A (en) * | 1987-04-11 | 1988-10-21 | Isuzu Motors Ltd | Heat insulated piston |
| JPH0745851B2 (en) * | 1987-04-11 | 1995-05-17 | いすゞ自動車株式会社 | Structure of adiabatic piston |
| DE102004028459A1 (en) * | 2004-06-11 | 2005-12-29 | Mahle Gmbh | Built piston for internal combustion engine consists of upper part with bearing edge, recess and nose part on bottom and under part shaped to form a shrink fit with upper part thereby joining them together |
| JP2008267205A (en) * | 2007-04-18 | 2008-11-06 | Nishishiba Electric Co Ltd | Piston and oilless compressor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0372830B2 (en) | 1991-11-19 |
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