JP2560402B2 - Internal combustion engine pistons - Google Patents

Internal combustion engine pistons

Info

Publication number
JP2560402B2
JP2560402B2 JP63087182A JP8718288A JP2560402B2 JP 2560402 B2 JP2560402 B2 JP 2560402B2 JP 63087182 A JP63087182 A JP 63087182A JP 8718288 A JP8718288 A JP 8718288A JP 2560402 B2 JP2560402 B2 JP 2560402B2
Authority
JP
Japan
Prior art keywords
piston
crown portion
thermal expansion
metal
aluminum
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 - Lifetime
Application number
JP63087182A
Other languages
Japanese (ja)
Other versions
JPH01262350A (en
Inventor
三哉 八木
徳郎 山下
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Isuzu Motors Ltd
Original Assignee
Isuzu Motors Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Isuzu Motors Ltd filed Critical Isuzu Motors Ltd
Priority to JP63087182A priority Critical patent/JP2560402B2/en
Publication of JPH01262350A publication Critical patent/JPH01262350A/en
Application granted granted Critical
Publication of JP2560402B2 publication Critical patent/JP2560402B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • 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
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0636—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston the combustion space having a substantially flat and horizontal bottom
    • 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
    • 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
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0603—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston at least part of the interior volume or the wall of the combustion space being made of material different from the surrounding piston part, e.g. combustion space formed within a ceramic part fixed to a metal piston head
    • F02B2023/0612—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston at least part of the interior volume or the wall of the combustion space being made of material different from the surrounding piston part, e.g. combustion space formed within a ceramic part fixed to a metal piston head the material having a high temperature and pressure resistance, e.g. ceramic
    • 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
    • F05C2203/00—Non-metallic inorganic materials
    • F05C2203/08—Ceramics; Oxides
    • F05C2203/0865—Oxide ceramics
    • F05C2203/0869—Aluminium oxide
    • 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
    • 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
    • F05C2253/00—Other material characteristics; Treatment of material
    • F05C2253/16—Fibres
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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)

Description

【発明の詳細な説明】 ［産業上の利用分野］ この発明はアルミニウム製ピストンのクラウン部を熱
膨張率の低い金属で形成した内燃機関のピストンに関す
る。Description: TECHNICAL FIELD The present invention relates to a piston for an internal combustion engine in which a crown portion of an aluminum piston is formed of a metal having a low coefficient of thermal expansion.

［従来の技術］ アルミニウム製ピストンのクラウン部の熱膨張を抑え
ようとした提案として第８図に示す「ピストン」（実開
昭60−82550号公報）の提案が知られている。[Prior Art] As a proposal for suppressing the thermal expansion of the crown portion of an aluminum piston, the proposal of "piston" (Japanese Utility Model Publication No. 60-82550) shown in Fig. 8 is known.

この提案は、ピストンクラウン部ａの側壁部ｂを、ピ
ストンクラウン部ｃを形成する合金よりも熱膨張率の低
い繊維材料を、体積比が10〜20％でそのピストンクラウ
ン部ａを形成する合金に混合し複合化させて形成し、
「ピストン」を構成したものである。In this proposal, the side wall portion b of the piston crown portion a is made of a fiber material having a coefficient of thermal expansion lower than that of the alloy forming the piston crown portion c, and an alloy forming the piston crown portion a at a volume ratio of 10 to 20%. Mixed to form a composite,
This is what constitutes a "piston".

［発明が解決しようとする課題］ しかし提案にあっては、鋳造製造時及びピストン実働
時の熱サイクルによって、合金と繊維材料との境界面に
内部的なクラックか発生する確率が高く、信頼性の面で
解決すべき課題となっていた。[Problems to be Solved by the Invention] However, in the proposal, there is a high probability that internal cracks will occur at the interface between the alloy and the fiber material due to the heat cycle during casting production and piston operation, and reliability is high. It was a problem to be solved in terms of.

そこでピストンのクラウン部の外周面にニレジスト
（ニッケル−クロム系オーステナイト）から成る環状部
材を嵌合する段付部を形成し、その段付部に環状部材を
拡散接合して一体化させる「ピストン」（実開昭62−14
149号公報）や、ピストンのクラウン部とスカート部を
軸方向にインロー嵌合するように形成し、これらをクラ
ンクピンで結合するように構成した「冷却機構の組立構
造ピストン」（特開昭54−47937号公報）等が提案され
ていたが、前者は拡散接合時に拡散接合面に脆い金属間
化合物を形成する恐れがある点で、後者は分割構造とし
たために、ピストンピンを挿入するボス部に応力集中が
起り易い点で共に採用が困難になっていた。Therefore, a stepped portion is formed on the outer peripheral surface of the crown portion of the piston, in which an annular member made of Niresist (nickel-chromium austenite) is fitted, and the annular member is diffusion-bonded to the stepped portion to be integrated. (Actual development 62-14
No. 149) or a "cooling mechanism assembly structure piston" in which the crown portion and the skirt portion of the piston are formed so as to be fitted in the spigot in the axial direction, and these are coupled by a crank pin (Japanese Patent Laid-Open No. -47937) was proposed, but the former may form a brittle intermetallic compound on the diffusion bonding surface during diffusion bonding, and the latter has a split structure, so the boss part for inserting the piston pin is proposed. It was difficult to adopt both because stress concentration is likely to occur.

［課題を解決するための手段］ この発明は、上記課題を解決することを目的とし、こ
の発明はアルミニウム製ピストンのクラウン部の少なく
とも外周部を熱膨張率の低い金属で形成すると共に、該
金属とアルミニウム部分との境界にチタン層を介在させ
て成る内燃機関のピストンを構成したものである。[Means for Solving the Problems] The present invention has an object to solve the above problems, and the present invention forms at least the outer peripheral portion of the crown portion of an aluminum piston with a metal having a low coefficient of thermal expansion, The piston of the internal combustion engine is formed by interposing a titanium layer at the boundary between the aluminum part and the aluminum part.

［作用］ チタン層は、低熱膨張率を有した金属及びアルミニウ
ム部分の相互に対して拡散接合の相性がよく且つチタン
層との相互間に脆い金属化合物を形成する事がない。ま
たチタンの熱膨張率はアルミニウムと低熱膨張率を有し
た金属のほぼ中間から拡散接合時の熱ひずみによって発
生するクラックを防止し、ピストンの実働時の熱サイク
ルによって発生するクラックを防止する。即ち低熱膨張
率を有した金属の接合強度は一定に維持されるから、低
熱膨張率を有した金属は、破壊や脱落することなくピス
トンの実働時においてクラウン部の熱膨張を阻み、ピス
トンの実働時におけるスラップ音の発生，燃焼ガスの吹
き抜け，オイルの漏洩を防止すること及び燃費を向上さ
せることを可能にする。[Operation] The titanium layer has a good compatibility with the metal and aluminum portions having a low coefficient of thermal expansion for diffusion bonding, and does not form a brittle metal compound with the titanium layer. Further, the coefficient of thermal expansion of titanium prevents cracks that occur due to thermal strain at the time of diffusion bonding from about the middle of aluminum and a metal having a low coefficient of thermal expansion, and prevents cracks that occur due to thermal cycles during actual operation of the piston. That is, since the bonding strength of a metal having a low coefficient of thermal expansion is maintained constant, a metal having a low coefficient of thermal expansion prevents thermal expansion of the crown portion during actual operation of the piston without breaking or falling off, and the actual operation of the piston is prevented. It is possible to prevent the generation of slap noise, blowout of combustion gas, oil leakage and improve fuel efficiency.

［実施例］ 以下にこの発明の好適な一実施例を添付図面に基づい
て説明する （第１実施例） この実施例はピストンのクラウン部を強化繊維金属
（FRM）で構成した例を示したものである。[Embodiment] A preferred embodiment of the present invention will be described below with reference to the accompanying drawings (first embodiment). This embodiment shows an example in which the crown portion of the piston is made of reinforced fiber metal (FRM). It is a thing.

第１図に示されるように、ピストン１は有底筒体状に
形成され、上部のクラウン部２と下部のスカート部３か
ら構成される。スカート部３の対向する内面には半径方
向に***させてピストンピン（図示せず）を貫通させる
ボス部4,4が形成されており、それらボス部4,4間に位置
されたコンロッド（図示せず）のスモールエンドをピス
トンピンで回転支持するようにしている。As shown in FIG. 1, the piston 1 is formed in the shape of a cylinder with a bottom, and is composed of an upper crown portion 2 and a lower skirt portion 3. Boss portions 4, 4 are formed on the inner surfaces of the skirt portion 3 which face each other so as to bulge in the radial direction and allow a piston pin (not shown) to penetrate therethrough. The connecting rods located between these boss portions 4, 4 (see FIG. The small end (not shown) is rotatably supported by a piston pin.

さて、クラウン部２は第２図に示すように芯体６にSi
C,Al2O3等のセラミック繊維７を網目状に巻き付けて、
セラミック繊維７の巻回体８を作り、この巻回体８を型
内に収容した後、溶湯を注ぎ約500気圧の加圧鋳造を経
て成形される。ところで、芯体６及び溶湯の材質は、実
施例にあってはスカート部と同材質のアルミ合金、例え
ばAC8系合金（JIS規格）とし、上記セラミック繊維の体
質あたりの巻回密度は略10〜40％とする。芯体６の円周
方向に対するセラミック繊維７の巻回角θは±５゜〜±
30゜の範囲から選択する。ただし、巻回角θは小さい程
円周方向の熱膨張を小さくする。このようにして形成さ
れたクラウン部２は第１図及び第２図に示してあるよう
に、ピストン１のスカート部３にチタン材を円盤状に形
成した中間板９を介して拡散接合され固着される。Now, as shown in FIG. 2, the crown portion 2 has a core body 6 made of Si.
Wrap a ceramic fiber 7 such as C, Al 2 O 3 in a mesh shape,
The wound body 8 of the ceramic fiber 7 is formed, the wound body 8 is housed in a mold, and then a molten metal is poured into the wound body 8 and pressure molding is performed at about 500 atm to form the wound body. By the way, in the embodiment, the material of the core body 6 and the molten metal is an aluminum alloy of the same material as the skirt portion, for example, AC8 alloy (JIS standard), and the winding density per constitution of the ceramic fiber is about 10 to. 40% The winding angle θ of the ceramic fiber 7 with respect to the circumferential direction of the core body 6 is ± 5 ° to ±
Select from the 30 ° range. However, the smaller the winding angle θ, the smaller the thermal expansion in the circumferential direction. As shown in FIGS. 1 and 2, the crown portion 2 thus formed is diffusion-bonded and fixed to the skirt portion 3 of the piston 1 through an intermediate plate 9 formed of a titanium material in a disk shape. To be done.

一方、クラウン部２には、外周面に沿ってトップリン
グ溝10が形成されているが、このトップリング溝10は上
述の如くセラミック繊維７の介在によって耐摩耗性に優
れているから、このトップリング溝10が形成された摩耗
防止用のリングをピストン１に一体的に設ける必要がな
くなる。さらに、クラウン部２の軸芯方向に沿ってキャ
ビティ11を形成する場合は、クラウン部２の軸方向の長
さを長くし、後加工（機械加工）にて形成する。On the other hand, the crown portion 2 has a top ring groove 10 formed along the outer peripheral surface thereof. Since the top ring groove 10 has excellent wear resistance due to the interposition of the ceramic fibers 7 as described above, this top ring groove 10 is formed. It is not necessary to integrally provide the piston 1 with a ring for wear prevention in which the ring groove 10 is formed. Further, when forming the cavity 11 along the axial direction of the crown portion 2, the length of the crown portion 2 in the axial direction is increased, and the cavity 11 is formed by post-processing (machining).

尚、この実施例で中間板９に対してスカート部３の上
面及びクラウン部２の下面を相互に拡散接合する説明を
したが、拡散接合に替えてろう付や電子ビーム溶接で接
合することも当然可能である。Although the upper surface of the skirt portion 3 and the lower surface of the crown portion 2 are mutually diffusion-bonded to the intermediate plate 9 in this embodiment, they may be joined by brazing or electron beam welding instead of diffusion welding. Of course it is possible.

したがって、スカート部３にクラウン部２を一体的に
且つ確実に接合することができ、且つクラウン部３の熱
膨張係数をアルミ合金の1/4程度とすることができるか
ら、クラウン部２とシリンダ（図示せず）とのクリアラ
ンスを従来の1/4程度とすることができ、課題をとなっ
ていたスラップ音を低減し、パティキュレートの低減及
び燃焼ガスの吹き抜けやオイルの漏洩を低減し、燃費を
向上させることができる。また、チタンの熱膨張係数は
約8.5×10-6/℃で、アルミ合金と強化繊維の中間をとる
ため、接合時に於ける熱歪が小さくなると共に実働時に
於ける熱サイクルによるクラックの発生がない。即ち、
熱伝導が緩和されることによって接合強度が一定に維持
される。Therefore, the crown portion 2 can be integrally and surely joined to the skirt portion 3 and the coefficient of thermal expansion of the crown portion 3 can be set to about 1/4 of that of the aluminum alloy. The clearance with (not shown) can be set to about 1/4 of the conventional one, reducing the slap sound that has been a problem, reducing particulates and reducing blow-by of combustion gas and oil leakage, Fuel efficiency can be improved. In addition, the coefficient of thermal expansion of titanium is about 8.5 × 10 -6 / ° C, and it is between the aluminum alloy and the reinforcing fiber, so the thermal strain at the time of joining is small and the occurrence of cracks due to the thermal cycle during actual operation. Absent. That is,
Since the heat conduction is relaxed, the joint strength is kept constant.

さらに、クラウン部２及びこのクラウン部２に形成す
るキャビティ11は、強化繊維金属で形成されるから、耐
熱性が大幅に向上し高温強度が向上する。Further, since the crown portion 2 and the cavity 11 formed in the crown portion 2 are formed of the reinforced fiber metal, the heat resistance is greatly improved and the high temperature strength is improved.

（第２実施例） この実施例は上記強化繊維金属で形成したクラウン部
２を熱膨張係数が10×10-6/℃のダクタイル鋳鉄で形成
する例を示したものである。(Second Embodiment) This embodiment shows an example in which the crown portion 2 formed of the above-mentioned reinforcing fiber metal is formed of ductile cast iron having a thermal expansion coefficient of 10 × 10 −6 / ° C.

第４図に示されるように、まずダクタイル鋳鉄でクラ
ウン部２を成形し、その成形されたクラウン部２を上記
中間板９のキャビティ11に相当する部分を上方へ凸に窪
ませて成形された中間板12を拡散接合する。As shown in FIG. 4, first, the crown portion 2 is formed of ductile cast iron, and the formed crown portion 2 is formed by denting a portion of the intermediate plate 9 corresponding to the cavity 11 upwardly. The intermediate plate 12 is diffusion-bonded.

ただし、拡散接合性をより向上させるためにチタン材
から成る中間板12の接合面にニッケル箔或いは銀箔を挿
入して境界面の密着度を向上させるようにしても構わな
いが、この場合は拡散接合温度は900℃程度が好まし
い。However, in order to further improve the diffusion bondability, nickel foil or silver foil may be inserted into the joint surface of the intermediate plate 12 made of titanium material to improve the adhesion of the boundary surface. The joining temperature is preferably about 900 ° C.

次に中間板12を接合したクラウン部２を、その中間板
12を上に向けて鋳造型内にセットし、アルミニウム合金
の溶湯を注ぎ、加圧鋳造を行うと、第１図に示すピスト
ン１が形成される。Next, the crown portion 2 to which the intermediate plate 12 is joined is
The piston 1 shown in FIG. 1 is formed by setting 12 in the casting mold, pouring a molten aluminum alloy, and performing pressure casting.

加圧鋳造時にあってチタンとアルミニウム合金及びチ
タンとダクタイル鋳鉄とは、拡散接合性が良く、また境
界面に脆い金属間化合物を生成することがないから、境
界面のクラック発生を防止し、接合強度を確実にする。
即ち、高い信頼性を得ることができる。At the time of pressure casting, titanium and aluminum alloy and titanium and ductile cast iron have good diffusion bonding properties and do not generate brittle intermetallic compounds at the interface, thus preventing cracking at the interface and joining. Ensure strength.
That is, high reliability can be obtained.

したがって、この実施例にあってもクラウン部２を形
成するダクタイル鋳鉄がアルミニウム合金の1/2程度の
熱膨張係数を有しているから、クラウン部２とシリンダ
とのクリアランスを従来の1/2とすることができる。
尚、中間板12は第３図に示した形状であっても構わな
い。Therefore, even in this embodiment, since the ductile cast iron forming the crown portion 2 has a coefficient of thermal expansion of about 1/2 of that of the aluminum alloy, the clearance between the crown portion 2 and the cylinder can be reduced to 1/2 of the conventional clearance. Can be
The intermediate plate 12 may have the shape shown in FIG.

（第３実施例） この実施例は、アルミニウム合金から形成されるクラ
ウン部２の外周面を上記ダクタイル鋳鉄で構成した例を
示したものである。(Third Embodiment) This embodiment shows an example in which the outer peripheral surface of the crown portion 2 formed of an aluminum alloy is made of the ductile cast iron.

第５図に示してあるように、アルミニウム合金で形成
されるクラウン部２を予めスカート部３に対して縮径し
てピストン１を段状に成形する。一方、第５図及び第６
図に示すように、その段付部13に嵌合する中間リング14
をチタン材から成形し、中間リング14の外周面に第５図
及び第７図に示すようにダクタイル鋳鉄から成る環状部
材15を嵌合し、これらをろう付け、または拡散接合して
一体化する。この後、一体化された中間リング14を段付
部13に嵌合し拡散接合する。As shown in FIG. 5, the crown portion 2 made of an aluminum alloy is reduced in diameter with respect to the skirt portion 3 in advance to form the piston 1 in a stepped shape. On the other hand, FIG. 5 and FIG.
As shown, an intermediate ring 14 that fits into the stepped portion 13
Is molded from a titanium material, and an annular member 15 made of ductile cast iron is fitted to the outer peripheral surface of the intermediate ring 14 as shown in FIGS. 5 and 7, and these are integrated by brazing or diffusion bonding. . After that, the integrated intermediate ring 14 is fitted to the stepped portion 13 and diffusion-bonded.

ところで上記の拡散接合にあっては、嵌合のはめ合い
をきつくして圧入するように相互の寸法を定め、圧入に
よる拡散接合することも当然可能であり、またチタンと
鋳鉄との間に第２実施例同様ニッケル箔、銀箔を挿入し
てもよい。参考としてチタンとアルミニウムとの拡散接
合温度は500℃程度、チタンと鋳鉄との拡散接合温度は9
00℃程度が好ましい。By the way, in the above diffusion bonding, it is naturally possible to determine mutual dimensions so that the fitting fit is tight and press-fit, and then the diffusion bonding by press-fitting is performed. You may insert nickel foil and silver foil like 2nd Example. As a reference, the diffusion bonding temperature of titanium and aluminum is about 500 ℃, and the diffusion bonding temperature of titanium and cast iron is 9 ℃.
About 00 ° C is preferable.

尚、第３実施例において、上記ダクタイル鋳鉄に替え
て上記第１実施例で説明した強化繊維金属で環状部材15
を構成しても構わない。In the third embodiment, the annular member 15 is made of the reinforcing fiber metal described in the first embodiment instead of the ductile cast iron.
May be configured.

さらに、第２実施例及び第３実施例で説明したダクタ
イル鋳鉄は鋳鉄の一例であり、耐摩耗性及び熱膨張率の
低い鋳鉄であれば良い。Further, the ductile cast iron described in the second and third embodiments is an example of cast iron, and any cast iron with low wear resistance and low coefficient of thermal expansion may be used.

［発明の効果］ 以上説明したことから明らかなようにこの発明によれ
ば次の如き優れた効果を発揮する。[Effects of the Invention] As is apparent from the above description, the present invention exhibits the following excellent effects.

アルミニウム製ピストンのクラウン部の少なくとも外
周部を熱膨張率の低い金属で形成すると共に、その金属
とアルミニウム部分との境界にチタン層を介在させたか
ら、ピストンのクラウン部の熱膨張を阻み且つアルミニ
ウム部分と低熱膨張金属との高い接合信頼性を得ること
ができる。Since at least the outer peripheral portion of the crown portion of the aluminum piston is formed of a metal having a low coefficient of thermal expansion, and the titanium layer is interposed at the boundary between the metal and the aluminum portion, the thermal expansion of the crown portion of the piston is prevented and the aluminum portion is prevented. It is possible to obtain high joining reliability between the low thermal expansion metal and.

【図面の簡単な説明】[Brief description of drawings]

第１図はこの発明の第１実施例を示す断面図、第２図は
巻回体を示す斜視図、第３図は中間板を示す斜視図、第
４図は第２実施例を示す断面図、第５図は第３実施例を
示す断面図、第６図は中間リングを示す斜視図、第７図
は環状部材を示す斜視図、第８図は従来例を示す断面図
である。 図中、１はピストン、２はクラウン部、9,12はチタン材
から成る中間板である。FIG. 1 is a sectional view showing a first embodiment of the present invention, FIG. 2 is a perspective view showing a wound body, FIG. 3 is a perspective view showing an intermediate plate, and FIG. 4 is a sectional view showing a second embodiment. 5 and 5 are sectional views showing a third embodiment, FIG. 6 is a perspective view showing an intermediate ring, FIG. 7 is a perspective view showing an annular member, and FIG. 8 is a sectional view showing a conventional example. In the figure, 1 is a piston, 2 is a crown portion, and 9 and 12 are intermediate plates made of titanium material.

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】アルミニウム製ピストンのクラウン部の少
なくとも外周部を熱膨張率の低い金属で形成すると共
に、該金属とアルミニウム部分との境界にチタン層を介
在させて成る内燃機関のピストン。1. A piston for an internal combustion engine in which at least an outer peripheral portion of a crown portion of an aluminum piston is formed of a metal having a low coefficient of thermal expansion, and a titanium layer is interposed at a boundary between the metal and the aluminum portion.
JP63087182A 1988-04-11 1988-04-11 Internal combustion engine pistons Expired - Lifetime JP2560402B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63087182A JP2560402B2 (en) 1988-04-11 1988-04-11 Internal combustion engine pistons

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63087182A JP2560402B2 (en) 1988-04-11 1988-04-11 Internal combustion engine pistons

Publications (2)

Publication Number Publication Date
JPH01262350A JPH01262350A (en) 1989-10-19
JP2560402B2 true JP2560402B2 (en) 1996-12-04

Family

ID=13907845

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63087182A Expired - Lifetime JP2560402B2 (en) 1988-04-11 1988-04-11 Internal combustion engine pistons

Country Status (1)

Country Link
JP (1) JP2560402B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10662892B2 (en) * 2016-09-09 2020-05-26 Caterpillar Inc. Piston for internal combustion engine having high temperature-capable crown piece

Also Published As

Publication number Publication date
JPH01262350A (en) 1989-10-19

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