JPH01208552A - Piston for diesel engine and manufacture thereof - Google Patents
Piston for diesel engine and manufacture thereofInfo
- Publication number
- JPH01208552A JPH01208552A JP6827688A JP6827688A JPH01208552A JP H01208552 A JPH01208552 A JP H01208552A JP 6827688 A JP6827688 A JP 6827688A JP 6827688 A JP6827688 A JP 6827688A JP H01208552 A JPH01208552 A JP H01208552A
- Authority
- JP
- Japan
- Prior art keywords
- piston
- aluminum alloy
- ceramic
- ceramic member
- diesel engine
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 239000000919 ceramic Substances 0.000 claims abstract description 45
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims abstract description 11
- 101100443236 Drosophila melanogaster Diedel gene Proteins 0.000 claims 1
- 238000005266 casting Methods 0.000 abstract description 11
- 238000001816 cooling Methods 0.000 abstract description 5
- 230000002093 peripheral effect Effects 0.000 abstract 1
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000009413 insulation Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- ZJIRFPOFCZNBAC-UHFFFAOYSA-N 4-amino-2-(2-amino-2-carboxyethyl)sulfanylbutanoic acid Chemical compound NCCC(C(O)=O)SCC(N)C(O)=O ZJIRFPOFCZNBAC-UHFFFAOYSA-N 0.000 description 1
- 108010020212 4-amino-2-(S-cysteinyl)butyric acid Proteins 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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
- F02F7/00—Casings, e.g. crankcases or frames
- F02F7/0085—Materials for constructing engines or their parts
- F02F7/0087—Ceramic materials
-
- 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
- F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
-
- 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
-
- 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
- F05C2251/00—Material properties
- F05C2251/04—Thermal properties
- F05C2251/042—Expansivity
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、ディーゼル機関で使用するピストンおよびそ
の製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a piston used in a diesel engine and a method for manufacturing the piston.
（従来の技術）
従来、燃料着火性の改善、出力の増大、排ガスの清浄化
等の目的で、ディーゼル機関用ピストンにおいて燃料噴
射ノズルより噴射された燃料噴霧が直接衝突する部分を
セラミック製部材等の断熱部材で構成し、その断熱部材
をアルミニウム合金等で鋳込んで製造したものが知られ
ている。 □例えば、実開昭５２−１２７１１０号公報
においては、第５図に示すようにピストン１１の頭部に
該ピストン１１の一部が埋設されるように断熱層１２を
鋳込んでなる内燃機関が開示されている。また、実開昭
６０−６５３３３号公報においては、第６図に示すよう
にピストン１１の頂部に燃焼室キャビティ１３を形成し
、この燃焼室キャビティ１３の上端部壁面に環状の断熱
材１５を鋳込んでなる直接噴射式ディーゼル機関の燃焼
室装置が開示されている。(Prior Art) Conventionally, for the purpose of improving fuel ignitability, increasing output, and purifying exhaust gas, ceramic members, etc. were used to cover the part of a diesel engine piston that directly collides with the fuel spray injected from the fuel injection nozzle. It is known that the heat insulating member is made of aluminum alloy or the like and manufactured by casting the heat insulating member. □For example, in Japanese Utility Model Application Publication No. 52-127110, an internal combustion engine is provided in which a heat insulating layer 12 is cast into the head of a piston 11 so that a part of the piston 11 is buried as shown in FIG. Disclosed. Further, in Japanese Utility Model Application Publication No. 60-65333, a combustion chamber cavity 13 is formed at the top of the piston 11 as shown in FIG. A combustion chamber arrangement for a direct injection diesel engine is disclosed.
（発明が解決しようとする課題）
しかしながら、実開昭５２−１２７１１０号公報に開示
された内燃機関のピストンでは、第５図に示すように断
面部材の埋設部１４が内周部に向かって形成されている
ため、断熱部材固定後の冷却過程において、セラミック
製の断熱部材とピストン本体との間に熱膨張差に起因す
る隙間が生じ、ガタがでて確実な固定ができない欠点が
あった。(Problem to be Solved by the Invention) However, in the piston of an internal combustion engine disclosed in Japanese Utility Model Application Publication No. 52-127110, as shown in FIG. As a result, during the cooling process after fixing the heat insulating member, a gap is created between the ceramic heat insulating member and the piston body due to the difference in thermal expansion, which causes play and makes it impossible to securely fix the piston body.
また、実開昭６０−６５３３３号公報に開示されたピス
トンにおいては、燃焼室キャビティ１３のリップ部のみ
が断熱材１５より構成されるため、ピストン上端部から
リングへ熱が伝わりやす（断熱効果が少ない欠点があっ
た。In addition, in the piston disclosed in Japanese Utility Model Application Publication No. 60-65333, only the lip portion of the combustion chamber cavity 13 is made of the heat insulating material 15, so heat is easily transmitted from the upper end of the piston to the ring (the heat insulation effect is There were few drawbacks.
本発明は上述した課題を解消して、セラミック製部材の
アルミニウム合金よりなるピストン本体への固定が確実
で、断熱性も良好であるとともに、鋳ぐるみにより作製
するので量産が容易なディーゼル機関用ピストンおよび
その製造方法を提供しようとするものである。The present invention solves the above-mentioned problems, and provides a piston for diesel engines that can securely fix a ceramic member to a piston body made of an aluminum alloy, has good heat insulation properties, and can be easily mass-produced because it is made by casting. and its manufacturing method.
（課題を解決するための手段）
本発明のディーゼル機関用ピストンは、アルミニウム合
金とセラミック製部材より構成されるディーゼル機関用
ピストンにおいて、該セラミック製部材のピストン上端
面の反対側の面の下部に外周部に向かって突出したくび
れ部を形成し、該くびれ部をアルミニウム合金で外周部
より鋳ぐるんでピストン頭部に固定したことを特徴とす
るものである。(Means for Solving the Problems) A diesel engine piston of the present invention is a diesel engine piston made of an aluminum alloy and a ceramic member, in which a lower part of the surface of the ceramic member opposite to an upper end surface of the piston is provided. The piston is characterized by forming a constricted portion projecting toward the outer periphery, and fixing the constricted portion to the piston head by casting aluminum alloy from the outer periphery.
また、本発明のディーゼル機関用ピストンの製造方法の
第１発明は、アルミニウム合金とセラミック製部材より
構成されるディーゼル機関用ピストンの製造法において
、キャビティ部およびピストンヘッドの上端面を構成す
る下部に外周部に向かって突出したくびれ部を形成した
セラミック製部材を、アルミニウム合金で鋳ぐるんだこ
とを特徴とするものである。Further, the first invention of the method for manufacturing a piston for a diesel engine according to the present invention is a method for manufacturing a piston for a diesel engine composed of an aluminum alloy and a ceramic member, in which a lower portion constituting a cavity portion and an upper end surface of a piston head is It is characterized by having a ceramic member formed with a constricted portion protruding toward the outer periphery, which is cast in an aluminum alloy.
さらに、本発明のディーゼル機関用ピストンの製造方法
の第２発明は、アルミニウム合金とセラミック製部材よ
り構成されるディーゼル機関用ピストンの製造法におい
て、ピストンヘッドの上端面外周部を構成する下部に外
周部に向かって突出したくびれ部を形成したリング状の
セラミック製部材と、キャビティ部およびピストン本体
を構成するアルミニウム合金製部材とをアルミニウム合
金で鋳ぐるんだことを特徴とするものである。Furthermore, a second aspect of the method for manufacturing a piston for a diesel engine according to the present invention is that in the method for manufacturing a piston for a diesel engine made of an aluminum alloy and a ceramic member, an outer periphery is provided at a lower portion constituting the outer periphery of the upper end surface of the piston head. A ring-shaped ceramic member having a constricted portion projecting toward the piston body, and an aluminum alloy member constituting the cavity portion and the piston body are cast in aluminum alloy.
（作 用）
上述した構成において、セラミック製部材のピストン上
端面の反対側の面の下部に外周部に向かって突出したく
びれ部をアルミニウム合金で鋳ぐるんでいるため、冷却
過程において熱膨張差に起因する変形は両者の間の結合
が強くなるようになる。そのため、セラミック製部材と
アルミニウム合金よりなるピストン本体との間を強固に
固定することができる。(Function) In the above-mentioned configuration, a constricted portion protruding toward the outer periphery is cast in the lower part of the ceramic member opposite to the upper end surface of the piston, so that the difference in thermal expansion is absorbed during the cooling process. The resulting deformation causes the bond between the two to become stronger. Therefore, it is possible to firmly fix the ceramic member and the piston body made of an aluminum alloy.
また、ピストン頭部の上面のリップ部を除く部分全体が
セラミック製部材であると、断熱性の向上効果とともに
、リップ部が耐熱部材である場合に生じるリップ部の高
温化により燃焼時排ガス中に生成するＮＯ，増大を有効
に防止できるため好ましい。In addition, if the entire top surface of the piston head except for the lip is made of ceramic, it not only improves heat insulation, but also increases the temperature of the lip, which occurs when the lip is made of a heat-resistant material. This is preferable because it can effectively prevent the increase in NO generated.
さらに、鋳ぐるみによる製造に際し、ピストンヘッドの
上端面外周部を構成するセラミック製部材と、キャビテ
ィ部およびピストン本体を構成するアルミニウム合金製
部材とを予め作製しておき、両者をアルミニウム合金で
鋳ぐるんだ場合は、アルミニウム合金の鋳ぐるみ量を少
なくできるため、冷却時アルミ合金が熱収縮によりセラ
ミック製部材に作用する圧縮力を低減できるので破壊す
ることはなく、また鋳ぐるみ後の残留応力も少ない。Furthermore, when manufacturing by casting, a ceramic member that makes up the outer periphery of the upper end surface of the piston head and an aluminum alloy member that makes up the cavity part and the piston body are prepared in advance, and both are cast in aluminum alloy. When soldering, the amount of aluminum alloy filling can be reduced, so the compressive force that acts on the ceramic component due to the aluminum alloy's thermal contraction during cooling can be reduced, so it will not break, and there will be no residual stress after casting. few.
（実施例） 第１図は本発明のピストンの一例を示す断面図である。(Example) FIG. 1 is a sectional view showing an example of the piston of the present invention.
第１図に示す実施例においては、キャビティ部２を有す
るとともに、ピストン上端面３の反対側の面の下部に外
周部に向かって突出するよう設けたくびれ部４を有する
セラミック製部材５をアルミニウム合金により鋳込んで
、ピストン本体６とセラミック製部材５とよりピストン
１を構成している。すなわち、キャビティ部２の全体が
セラミックスより構成されている。くびれ部４はセラミ
ック製部材５の下部全周にわたって設けられている。ま
た、セラミック製部材５のピストン上端面３の反対側の
面の下部と外周部に向かって突出したくびれ部４との傾
斜角が８０°以下より好ましくは７０゛以下に形成され
るか、さらに好ましくはくびれ部４のセラミック製部材
突起部外径ｄ。In the embodiment shown in FIG. 1, a ceramic member 5 having a cavity portion 2 and a constriction portion 4 provided at the lower part of the surface opposite to the upper end surface 3 of the piston so as to protrude toward the outer circumferential portion is made of aluminum. The piston 1 is composed of a piston body 6 and a ceramic member 5, which are cast from an alloy. That is, the entire cavity portion 2 is made of ceramics. The constricted portion 4 is provided over the entire lower circumference of the ceramic member 5. Further, the angle of inclination between the lower part of the surface of the ceramic member 5 opposite to the piston upper end surface 3 and the constricted portion 4 protruding toward the outer periphery is formed to be less than 80°, preferably less than 70°; Preferably, the outer diameter d of the ceramic member protrusion of the constricted portion 4.
とアルミ合金製部材突起部内径ｄ、の関係が運転時の温
度において次の条件を満たすことにより、セラミック製
部材の運転時の抜けがなく好ましい。It is preferable that the relationship between d and the inner diameter d of the projection of the aluminum alloy member satisfy the following condition at the temperature during operation, so that the ceramic member does not come off during operation.
ｄｃ（セラミック製部材外径） ＞ｄ、 （アルミ合金
製部材内径）
セラミック製部材としては耐熱性、耐熱衝撃性、断熱性
に優れたセラミックスが好ましく、窒化ケイ素、炭化ケ
イ素、サイアロン、部分安定化ジルコニア、ムライト、
アルミナのいずれかより構成されているとさらに好まし
い。さらに、アルミニウム合金としては、ＪＩＳ Ｈ５
２０２で規定するＡＣＢＡをはじめとして従来ピストン
に使用されたものはいずれも使用可能である。dc (outer diameter of ceramic member) > d, (inner diameter of aluminum alloy member) As the ceramic member, ceramics with excellent heat resistance, thermal shock resistance, and heat insulation properties are preferred, including silicon nitride, silicon carbide, sialon, and partially stabilized materials. zirconia, mullite,
More preferably, it is made of alumina. Furthermore, as an aluminum alloy, JIS H5
Any material conventionally used for pistons can be used, including ACBA specified in No. 202.
なお、鋳ぐるみにあたっては、セラミック製部材５に対
する熱衝撃を緩和して７２０℃程度のアルミニウム溶湯
を注湯したときにセラミック製部材５が割れないように
するためにセラミック製部材５を約５００℃以上に加熱
した後鋳込むと好ましい。In addition, when casting, the ceramic member 5 is heated to about 500°C in order to reduce the thermal shock to the ceramic member 5 and prevent the ceramic member 5 from cracking when molten aluminum at about 720°C is poured. It is preferable to cast after heating to the above temperature.
また、アルミニウム合金よりなるピストン本体６の強度
を高めるため、熱処理としてＪＩＳ Ｈ５２０２に定め
るＴ６処理を施した。Further, in order to increase the strength of the piston body 6 made of an aluminum alloy, T6 treatment specified in JIS H5202 was performed as heat treatment.
第２図は本発明のピストンの他の例を示す断面図である
。第２図に示す実施例において、第１図に示す部材と同
一のものには同一の符号を付し、その説明を省略する。FIG. 2 is a sectional view showing another example of the piston of the present invention. In the embodiment shown in FIG. 2, the same members as those shown in FIG. 1 are given the same reference numerals, and their explanations will be omitted.
第２図において第１図に示す実施例と異なる点は、キャ
ビティ部２の底部をアルミニウム合金製のピストン本体
６により構成している点である。本実施例では、セラミ
ック製部材５とピストン本体６との間の強固な接合が達
成できるとともに、第１図に示す実施例と比べてキャビ
ティ部２の熱をピストン本体６から逃がすことによりキ
ャビティ部２の高温化を防止でき、ＮＯ，を減少させる
ことができる。The difference in FIG. 2 from the embodiment shown in FIG. 1 is that the bottom of the cavity portion 2 is constituted by a piston body 6 made of aluminum alloy. In this embodiment, a strong bond between the ceramic member 5 and the piston body 6 can be achieved, and the heat in the cavity 2 can be released from the piston body 6 compared to the embodiment shown in FIG. 2 can be prevented from increasing in temperature, and NO can be reduced.
第３図は本発明のピストンのさらに他の例を示す断面図
である。第３図に示す実施例において、第１図に示す部
材と同一のものは同一の符号を付し、その説明を省略す
る。第３図において第１図に示す実施例と異なる点は、
キャビティ部２全体をアルミニウム合金製のピストン本
体６により構成している点である。本実施例では、セラ
ミック製部材５とピストン本体６との間の強固な接合が
達成できるとともに、キャビティ部２全体がピストン本
体６より構成され、さらに他の部分はセラミック製部材
５より構成されているため、キャビティ部２の熱をピス
トン本体６から逃がすことによりキャビティ部２の高温
化を防止でき、ＮＯＸを減少させることができる。FIG. 3 is a sectional view showing still another example of the piston of the present invention. In the embodiment shown in FIG. 3, the same members as those shown in FIG. 1 are given the same reference numerals, and their explanations will be omitted. The differences in FIG. 3 from the embodiment shown in FIG. 1 are as follows:
The point is that the entire cavity portion 2 is constituted by a piston body 6 made of aluminum alloy. In this embodiment, a strong bond between the ceramic member 5 and the piston body 6 can be achieved, and the entire cavity portion 2 is made up of the piston body 6, and the other parts are made of the ceramic member 5. Therefore, by releasing the heat in the cavity 2 from the piston body 6, it is possible to prevent the cavity 2 from increasing in temperature and reduce NOx.
第４図は本発明のピストンのさらに他の例を示す断面図
である。第４図に示す実施例においても、第１図に示す
部材と同一のものは同一の符号を付し、その説明を省略
する。第４図において第１図に示す実施例と異なる点は
、キャビティ部２およびピストン本体６を形成するアル
ミニウム合゛金製部材７と、ピストン上端面３の外周部
を構成するセラミック製部材５とを予め作製した後、ア
ルミニウム合金製部材７とセラミック製部材５とを組み
立て、両者の接合部８をアルミニウム合金で鋳ぐるんで
ピストンを構成した点である。本実施例では、アルミニ
ウム合金の鋳ぐるみ量を少なくでき、セラミック製部材
５が熱膨張差により破壊することはなく、また鋳ぐるみ
後の残留応力も少ない。FIG. 4 is a sectional view showing still another example of the piston of the present invention. In the embodiment shown in FIG. 4, the same members as those shown in FIG. The difference in FIG. 4 from the embodiment shown in FIG. 1 is that the aluminum alloy member 7 forming the cavity portion 2 and the piston body 6 and the ceramic member 5 forming the outer circumference of the piston upper end surface 3 are different from the embodiment shown in FIG. The piston is constructed by assembling the aluminum alloy member 7 and the ceramic member 5, and casting the joint 8 of the two with aluminum alloy. In this embodiment, the amount of aluminum alloy casting can be reduced, the ceramic member 5 will not be destroyed due to the difference in thermal expansion, and the residual stress after casting will be small.
本発明は上述した実施例にのみ限定されるものではなく
、幾多の変形、変更が可能である。例えば、キャビティ
の形状は上述した実施例の形状に限定されないことはい
うまでもない。また、上述した実施例では、くびれ部４
をセラミック製部材５の下部全周にわたって設けたが、
くびれ部４を複数の部分に分割して設けることもできる
。The present invention is not limited only to the embodiments described above, and numerous modifications and changes are possible. For example, it goes without saying that the shape of the cavity is not limited to the shape of the embodiment described above. Further, in the embodiment described above, the constriction portion 4
was provided all around the lower part of the ceramic member 5,
The constricted portion 4 can also be provided by being divided into a plurality of parts.
（発明の効果）
以上詳細に説明したところから明らかなように、本発明
のディーゼル機関用ピストンによれば、セラミック製部
材のピストン上端面の反対側の面の下部に外周部に向か
って突出したくびれ部を設け、このくびれ部をアルミニ
ウム合金で鋳ぐるんでいるため、冷却過程において熱膨
張差に起因して生ずる変形を有効に利用でき、セラミッ
ク製部材のピストン本体への強固な接合を達成すること
ができる。また、本発明のピストンは鋳ぐるみで作製で
きるため、容易に量産することが可能である。(Effects of the Invention) As is clear from the detailed explanation above, according to the diesel engine piston of the present invention, a ceramic member has a structure that protrudes toward the outer periphery at the bottom of the surface opposite to the top end surface of the piston. Since a constriction is provided and this constriction is cast with aluminum alloy, the deformation caused by the difference in thermal expansion during the cooling process can be effectively used, achieving a strong bond of the ceramic member to the piston body. be able to. Furthermore, since the piston of the present invention can be manufactured by casting, it can be easily mass-produced.
第１図〜第４図はそれぞれ本発明のピストンの一例を示
す断面図、
第５図および第６図はそれぞれ従来のピストンを示す断
面図である。
１・・・ピストン ２・・・キャビティ部３・
・・ピストン上端面
４・・・くびれ部
５・・・セラミック製部材
６・・・ピストン本体
７・・・アルミニウム合金製部材
８・・・接合部
特許出願人 日本碍子株式会社
第１図FIGS. 1 to 4 are sectional views showing an example of the piston of the present invention, and FIGS. 5 and 6 are sectional views showing a conventional piston, respectively. 1... Piston 2... Cavity part 3.
... Piston upper end surface 4 ... Constriction 5 ... Ceramic member 6 ... Piston body 7 ... Aluminum alloy member 8 ... Joint portion Patent applicant Nippon Insulators Co., Ltd. Figure 1
Claims (1)
るディーゼル機関用ピストンにおいて、該セラミック製
部材のピストン上端面の反対側の面の下部に外周部に向
かって突出したくびれ部を形成し、該くびれ部をアルミ
ニウム合金で外周部より鋳ぐるんでピストン頭部に固定
したことを特徴とするディーゼル機関用ピストン。 ２、アルミニウム合金とセラミック製部材より構成され
るディーゼル機関用ピストンの製造法において、キャビ
ティ部およびピストンヘッドの上端面を構成する下部に
外周部に向かって突出したくびれ部を形成したセラミッ
ク製部材を、アルミニウム合金で鋳ぐるんだことを特徴
とするディーゼル機関用ピストンの製造方法。 ３、アルミニウム合金とセラミック製部材より構成され
るディーゼル機関用ピストンの製造法において、ピスト
ンヘッドの上端面外周部を構成する下部に外周部に向か
って突出したくびれ部を形成したリング状のセラミック
製部材と、キャビティ部およびピストン本体を構成する
アルミニウム合金製部材とをアルミニウム合金で鋳ぐる
んだことを特徴とするディーデル機関用ピストンの製造
方法。[Claims] 1. In a diesel engine piston made of an aluminum alloy and a ceramic member, the ceramic member has a constricted portion protruding toward the outer periphery at the lower part of the surface opposite to the upper end surface of the piston. 1. A piston for a diesel engine, characterized in that the constricted portion is cast from the outer circumference with an aluminum alloy and fixed to the piston head. 2. A method for manufacturing a diesel engine piston made of an aluminum alloy and a ceramic member, in which a ceramic member is formed with a constricted part protruding toward the outer periphery in the lower part that constitutes the cavity part and the upper end surface of the piston head. , a method for manufacturing a piston for a diesel engine, characterized in that it is cast with an aluminum alloy. 3. In the manufacturing method of a diesel engine piston made of aluminum alloy and ceramic members, a ring-shaped ceramic piston is formed with a constricted part protruding toward the outer periphery at the lower part of the piston head that forms the outer periphery of the upper end surface of the piston head. A method for producing a piston for a Diedel engine, characterized in that the member and the aluminum alloy member constituting the cavity portion and the piston body are cast in aluminum alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6827688A JPH01208552A (en) | 1987-10-26 | 1988-03-24 | Piston for diesel engine and manufacture thereof |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62-268128 | 1987-10-26 | ||
| JP26812887 | 1987-10-26 | ||
| JP6827688A JPH01208552A (en) | 1987-10-26 | 1988-03-24 | Piston for diesel engine and manufacture thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01208552A true JPH01208552A (en) | 1989-08-22 |
Family
ID=26409492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6827688A Pending JPH01208552A (en) | 1987-10-26 | 1988-03-24 | Piston for diesel engine and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01208552A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015029985A1 (en) | 2013-08-26 | 2015-03-05 | 日本碍子株式会社 | Internal combustion engine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52131017A (en) * | 1976-04-26 | 1977-11-02 | Kubota Ltd | Engine piston |
| JPS5645259A (en) * | 1979-09-17 | 1981-04-24 | Honda Motor Co Ltd | Casting comprising dissimilar materials |
-
1988
- 1988-03-24 JP JP6827688A patent/JPH01208552A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52131017A (en) * | 1976-04-26 | 1977-11-02 | Kubota Ltd | Engine piston |
| JPS5645259A (en) * | 1979-09-17 | 1981-04-24 | Honda Motor Co Ltd | Casting comprising dissimilar materials |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015029985A1 (en) | 2013-08-26 | 2015-03-05 | 日本碍子株式会社 | Internal combustion engine |
| US9951740B2 (en) | 2013-08-26 | 2018-04-24 | Ngk Insulators, Ltd. | Internal combustion engine |
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