JPH03105005A - Cylinder head - Google Patents
Cylinder headInfo
- Publication number
- JPH03105005A JPH03105005A JP23912089A JP23912089A JPH03105005A JP H03105005 A JPH03105005 A JP H03105005A JP 23912089 A JP23912089 A JP 23912089A JP 23912089 A JP23912089 A JP 23912089A JP H03105005 A JPH03105005 A JP H03105005A
- Authority
- JP
- Japan
- Prior art keywords
- cylinder head
- valve seating
- seating surface
- brass
- valve seat
- 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
- 229910001369 Brass Inorganic materials 0.000 claims abstract description 29
- 239000010951 brass Substances 0.000 claims abstract description 29
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 14
- 239000000956 alloy Substances 0.000 claims description 20
- 229910045601 alloy Inorganic materials 0.000 claims description 19
- 229910000765 intermetallic Inorganic materials 0.000 claims description 19
- 229910016586 Mn5Si3 Inorganic materials 0.000 abstract description 5
- 150000002736 metal compounds Chemical class 0.000 abstract 4
- 230000008021 deposition Effects 0.000 abstract 2
- 239000010410 layer Substances 0.000 description 23
- 239000000463 material Substances 0.000 description 7
- 239000010949 copper Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- QFLWZFQWSBQYPS-AWRAUJHKSA-N (3S)-3-[[(2S)-2-[[(2S)-2-[5-[(3aS,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]pentanoylamino]-3-methylbutanoyl]amino]-3-(4-hydroxyphenyl)propanoyl]amino]-4-[1-bis(4-chlorophenoxy)phosphorylbutylamino]-4-oxobutanoic acid Chemical compound CCCC(NC(=O)[C@H](CC(O)=O)NC(=O)[C@H](Cc1ccc(O)cc1)NC(=O)[C@@H](NC(=O)CCCCC1SC[C@@H]2NC(=O)N[C@H]12)C(C)C)P(=O)(Oc1ccc(Cl)cc1)Oc1ccc(Cl)cc1 QFLWZFQWSBQYPS-AWRAUJHKSA-N 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007730 finishing process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910001234 light alloy Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 239000012783 reinforcing fiber Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
Abstract
Description
（産業上の利用分野）
この発明は、例えば自動車用エンジンの構戊部材として
利用されるシリンダヘッドに関するものである．
（従来の技術）
近年、自動車用エンジンの軽量化のために、シリングブ
ロックおよびシリンダヘッドの素材としてアルミニウム
合金などの軽合金を用いたものが一部実用化されている
．
このシリンダヘッドにはバルブ着座面を有しているが，
このバルブ着座面をアルミニウム合金それ自体でそのま
ま形成した場合には、著しい耐摩耗性不定となる．
そこで、シリンダヘッドのバルブ着座部付近をセラミッ
クス繊雑，炭素繊維，ガラス繊維などの強化繊維を含む
繊維強化金属とし、さらにバルブ着材部にＦｅ基，Ｎｉ
基，Ｃｏ基，Ｃｕ基などの耐摩耗性被［＃を設けてこの
部分にバルプ着座面を形成した構造のものとする考えも
あった（特開昭６１−７６７４２号，特開昭６１−７６
７４３号）．
（）Ａ明が解決しようとする課題）
しかしながら，このような従来のシリンダヘッドにおい
て、＃摩耗性被覆層としてＦｅ基，Ｎｉ基，Ｇｏ基の金
属を用いたものでは、アルミニウム合金製シリンダヘッ
ド母材と耐摩耗性被覆層との間における熱伝導度や熱膨
張係数の違いあるいは濡れ性の悪さのために、耐摩耗性
被覆層の耐久性が不十分なものであったりし、また耐摩
耗性被覆層としてＣｕ基の金属を用いたものでは＃摩耗
性が十分でないものになりやすいという課題があった．
（発明の目的）
この発明は、このような従来の課題にかんがみてなされ
たものであって，バルブ着座部にはアルミニウム合金製
シリンダ母材との間での熱伝導度や熱膨張係数の違いが
さほど大きくなく，また濡れ性が良好であって耐久性が
向上したものとなる黄銅系合金化層を設け、この黄銅系
合金化層に形成されるバルブ着座面の耐摩耗性が十分良
好なものとなるように、黄銅系合金化層に形成されるバ
ルブ着座面に針状の硬質金属間化合物が存在し且つまた
前記針状の硬質金属間化合物の長手力向が特定の方向に
析出したものとなるようにすることにより、耐久性の著
しい向上をはかることができるようにして、上述した従
来の課題を解決することを目的としている．(Industrial Application Field) The present invention relates to a cylinder head used as a structural member of an automobile engine, for example. (Prior Art) In recent years, in order to reduce the weight of automobile engines, some light alloys such as aluminum alloys have been put into practical use as materials for cylinder blocks and cylinder heads. This cylinder head has a valve seating surface,
If the valve seating surface were made of aluminum alloy itself, the wear resistance would be extremely unstable. Therefore, the vicinity of the valve seating part of the cylinder head is made of fiber-reinforced metal containing reinforcing fibers such as ceramic fibers, carbon fibers, and glass fibers, and the valve seating part is made of Fe-based and Ni-based materials.
There was also an idea to create a structure in which a wear-resistant coating such as Co-based, Co-based, Cu-based, etc. was provided and a valve seating surface was formed in this part (JP-A-61-76742, JP-A-61-61). 76
No. 743). () Problems to be solved by A-Mei) However, in such conventional cylinder heads, those using Fe-based, Ni-based, and Go-based metals as the abrasive coating layer have an aluminum alloy cylinder head matrix. The durability of the wear-resistant coating layer may be insufficient due to differences in thermal conductivity or thermal expansion coefficient or poor wettability between the material and the wear-resistant coating layer. However, there is a problem that abrasion resistance tends to be insufficient when a Cu-based metal is used as the protective coating layer. (Purpose of the Invention) This invention was made in view of the above-mentioned conventional problems. A brass-based alloyed layer is provided that is not very large, has good wettability, and has improved durability, and the valve seating surface formed on this brass-based alloyed layer has sufficiently good wear resistance. As a result, acicular hard intermetallic compounds were present on the valve seating surface formed in the brass alloy layer, and the longitudinal direction of the acicular hard intermetallic compounds was precipitated in a specific direction. The aim is to solve the above-mentioned conventional problems by making it possible to significantly improve durability.
（課題を解決するための手段）
この発明に係わるシリンダヘッドは、バルブ着座面をそ
なえたアルミニウム合金製のシリンダヘッドにおいて、
表面にＭｎ５Ｓｉ３等の針状の硬質金属間化合物が面積
率で５％以上存在し且つ前記針状の硬質金属間化合物の
長手方向がバルブ着座面の傾斜方向とほぼ平行な方向に
析出している黄銅系合金化層によってバルブ着座面が形
或されている構戒としたことを特徴としており，このよ
うなシリンダヘッドの構戊を前述した従来の課題を解決
するための手段としている．
この発明に係わるシリンダヘッドはアルミニウム合金よ
りなるものであるが、その合金組或は特に限定されず、
従来より開発されあるいはすでに実用化されているもの
が使用される．そして、このシリンダヘッドには，給気
側のバルブ着座面と排気側のバルブ着座面とをそなえて
いるが、必要に応じていずれか一方または両方のバルブ
着座面を複数化したものとすることができる．
そして、上記バルブ着座面のうち少な〈とも１つのバル
プ着座面は、黄銅系合金化層によって形成されているが
、この黄銅系合金化層のより望ましい戒分組成としては
，重量％で、Ｚｎ：２０〜４０％、Ｍｎ：１．５ 〜３
．０％．Ｓｉ：０．５〜１．５％，残部実質的にＣｕよ
りなるものが用いられ，必要に応じてＣｒやＮｉ等を添
加したものが用いられる．この場合、ＺｎはＣｕと共に
黄銅（７−３黄銅，４−６黄銅；しんちゅう）を形或す
る元素であり、このような黄銅の強度，耐摩耗性，耐熱
性等を向上させるためにＭｎ，Ｓｔ，Ｃｒ，Ｎｉ ，Ｓ
ｎ，Ｆｅ等を添加したものが用いられる．
そして、この黄銅系合金化層の表面には、Ｍｎ５Ｓｉ３
等の針状の金属間化合物が面積率で５％以上存在し且つ
前記針状の硬質金属間化合物の長手力向がバルブ着座面
の傾斜方向とほぼ平行な方向に析出しているものとなっ
ており、この部分でバルブ着座面が形成されるものとな
るようにしているが、この場合、針状の金属間化合物が
面積率で５％よりも少ないとバルブ着座面で十分な耐摩
耗性を得ることができないので好ましくない．
この場合、このように、針状の硬質金属間化合物の長手
力向がバルブ着座面の傾斜方向とほぼ平行な方向に析出
しているものとなすようにするためには、例えば黄銅合
金製のリング材をバルブ着座部に設置したのち溶融して
合金化し、あるいは黄銅合金よりなる粉末をバルブ着座
部に供給しつつ加熱して溶融合金化し、次いで冷却する
際の条件を設定することにより針状の硬質金属間化合物
をバルブ着座面の傾斜方向とほぼ平行な方向に析出して
いるものとなるようにし、その後適宜の仕上げ加工を行
って黄銅系合金化層においてパルブ着座面が形成された
シリンダヘッドとする．
（発明の作用）
この発明に係わるシリンダヘッドは、表面に面積率で５
％以上存在する針状の硬質金属間化合物の長手力向がバ
ルブ着座面の傾斜方向とほぼ平行な方向に析出している
黄銅系合金化層によってバルブ着座面を形成するように
しているから、アルミニウム合金製シリンダヘッドとの
間での熱伝導度および熱膨張係数の違いが小さくかつま
た濡れ性が良好なものとなっており、それゆえ熱伝導度
および熱膨張係数の違いや濡れ性の悪さによるクラック
の発生が起りがたく、バルブ着座面における耐摩耗性も
良好であって、耐久性に優れたものとなるという作用が
もたらされる．
（実施例）
第ｌ図および第２図は、この発明に係わるアルミニウム
合金製のシリンダヘッドの燃焼ボート部を示すものであ
って、このシリンダへッド１には点火プラグ２のほぼ両
側に給気ボート３と排気ボート４とを備えており、給気
ボート３には飴気側バルブ着座部５を有していると共に
排気ボート４には排気側バルブ着座部６を有している．
そして、給気側バルブ着座部５には図示しない給気バル
ブのバルブフェースが当接するバルプ着座面７を有して
いると共に、排気側バルブ看座部６には第２図にも示す
ように排気バルブ８のバルブフェース８ａが当接するバ
ルブ着座面２を有している．この場合、排気バルブ８は
バルブガイド１０によって案内されている．この排気側
バルブ着座部６においては、第３図にも示すように、表
面にＭｎ５Ｓｉ３等の針状の硬質金属間化合物１１が面
積率で５％以上存在し且つ前記針状の硬質金属間化合物
１１の長手力向がバルブ着座面２の傾斜方向とほぼ平行
な方向に析出している黄銅系合金化層１２によってバル
ブ着座面２が形成されており、シリンダヘッド１の黄銅
系合金化層１２との近傍には熱影響層１３が形成されて
いる構造をなしている．
このような構造のバルブ着座面２を形成するに際しては
、アルミニウム合金製シリンダヘッド１の燃焼ボート部
分における排気ボート４例のバルブ着座部６をリング溝
状に加工し，その溝内に黄銅合金溶製材からなるリング
を設置したのち、出力：４〜５ｋＷ，ビーム径：１０ｍ
ｍ，走査速度＝０．２〜０．３ｍ／ｍｉｎに設定した炭
酸ガスレーザにより加熱して、前記リングおよびシリン
ダヘッド１の一部を溶融することにより合金化させて，
排気ボート４側のバルブ着座部６に黄銅系合金化層１２
を形成させる．
このとき、シリンダへッド１の排気ボート４側に窒素ガ
ス等の不活性ガスを吹き付けて冷却することによって、
針状の硬質金属間化合物１１をその長手力向がバルプ着
座面９の傾斜方向とほぼ平行な方向に析出しているもの
となるようにしている．
次いで，適宜の仕上げ加工を行うことによって、黄銅系
合金化層１２において所定角度に傾斜したバルブ着座面
９を形成する．
なお、加熱手段としては、炭酸ガスレーザなどのレーザ
に限らず、電子ビームやプラズマアーク，などを用いて
も構わない．また、黄銅合金溶製材からなるリングの代
わりに同一威分の合金粉末をホッパー等より供給しなが
ら加熱することによってバルブ着座部に肉盛合金化し、
その後適宜の仕上げ加工を行うことによって、黄銅系合
金化層１２に所定角度に傾斜したバルブ着座面２を形成
するようにしてもよい．
次に、この実施例におけるアルミニウム合金製シリンダ
ヘッド１．黄銅合金溶製材リングおよび形成された黄銅
系合金化層１２の化学或分を第１表に示す．
次いで、実施例１，実施例２，比較例ｌの各シリンダヘ
ッドをエンジンに組み込み、第２表に示す条件による耐
久試験を行った．この結果を第３表に示す．さらに、実
施例ｌについて、耐久試験終了後における摺動面の走査
型電子顕微鏡写真像を得たところ、第４図に示すとおり
であり、同じく摺動面のＭｎ−Ｘ線像を得たところ第５
図に示す結果であった・
この結果、第３表に示すように、コバルト基耐熱合金化
層を形成させた比較例１のシリンダヘッドにおいては、
バルブおよびバルブ着座面の摩耗が大きいうえに、バル
ブ着座面にクラックの発生が見られた．これは、アルミ
ニウム合金製シリンダヘッド基材とコバルト基耐熱合金
化層との間での熱伝導度，熱膨張係数の違いや、低い濡
れ性のために、耐久試験中に合金化層にクラックが発生
し、剥離片がバルブフェースとバルブ着座面との間に介
在して、アブレーシブ状の摩耗となったものと考えられ
る．
一方、実施例１，２の黄銅系合金化層には、そのような
不具合は全く見られず、第４図に示す実施例ｌのシリン
ダヘッドの摺動面の走査型電子顕微鏡写真像を見ても摩
耗面は滑らかなものとなっており、耐久性は問題のない
ことが認められた．また、第５図に示す実施例１のシリ
ンダヘッドの摺動面のＭ ｎ ｍ Ｘ線像において針状
の白色部はＭｎ５Ｓｉ３からなる硬質相であり、この針
状の硬質金属間化合物の面積率は７．４％であった．そ
して、このような針状の硬質金属間化合物は面積率で５
％以上存在するものとするのがよいことが種々の実験よ
り確かめられた．さらに、Ｃｒ，Ｎｉ或分を加えた実施
例２のシリンダヘッドにおいては、耐摩耗性および耐熱
性をより一層向上できることが認められた．(Means for Solving the Problems) A cylinder head according to the present invention is an aluminum alloy cylinder head provided with a valve seating surface.
An acicular hard intermetallic compound such as Mn5Si3 exists on the surface in an area ratio of 5% or more, and the longitudinal direction of the acicular hard intermetallic compound is precipitated in a direction substantially parallel to the direction of inclination of the valve seating surface. The cylinder head is characterized by a structure in which the valve seating surface is shaped by a brass-based alloy layer, and this cylinder head structure is used as a means to solve the conventional problems mentioned above. The cylinder head according to the present invention is made of an aluminum alloy, but the alloy composition is not particularly limited.
Those that have been developed in the past or have already been put into practical use are used. This cylinder head has a valve seating surface on the intake side and a valve seating surface on the exhaust side, but one or both of the valve seating surfaces may be made into multiple valve seating surfaces as necessary. Can be done. At least one of the above-mentioned valve seating surfaces is formed of a brass-based alloyed layer, and a more desirable composition of this brass-based alloyed layer is Zn in weight%. :20~40%, Mn:1.5~3
．． 0%. Si: 0.5 to 1.5%, the balance essentially consisting of Cu, with Cr, Ni, etc. added as necessary. In this case, Zn is an element that forms brass (7-3 brass, 4-6 brass) together with Cu, and Mn is used to improve the strength, wear resistance, heat resistance, etc. of such brass. , St, Cr, Ni, S
Those to which n, Fe, etc. are added are used. Then, on the surface of this brass alloy layer, Mn5Si3
The acicular intermetallic compound exists in an area ratio of 5% or more, and the longitudinal direction of the acicular hard intermetallic compound is precipitated in a direction substantially parallel to the direction of inclination of the valve seating surface. In this case, if the area ratio of needle-shaped intermetallic compounds is less than 5%, the valve seating surface will not have sufficient wear resistance. This is not desirable because it is not possible to obtain In this case, in order to make the longitudinal direction of the acicular hard intermetallic compound to be precipitated in a direction almost parallel to the direction of inclination of the valve seating surface, it is necessary to The ring material is placed on the valve seat and then melted and alloyed, or powder made of brass alloy is supplied to the valve seat and heated to form a molten alloy, and then the conditions for cooling are set to create a needle-like shape. A cylinder in which a hard intermetallic compound is precipitated in a direction almost parallel to the inclination direction of the valve seating surface, and then an appropriate finishing process is performed to form a valve seating surface in the brass alloy layer. Let it be the head. (Operation of the invention) The cylinder head according to this invention has an area ratio of 5 on the surface.
The valve seating surface is formed by a brass-based alloy layer that is precipitated in a direction in which the longitudinal force of the acicular hard intermetallic compound present in the valve seating surface is approximately parallel to the direction of inclination of the valve seating surface. The difference in thermal conductivity and coefficient of thermal expansion between the cylinder head and the aluminum alloy cylinder head is small, and the wettability is also good. The valve seating surface has good wear resistance and excellent durability. (Example) Fig. 1 and Fig. 2 show the combustion boat portion of the cylinder head made of aluminum alloy according to the present invention. It is equipped with an air boat 3 and an exhaust boat 4. The air supply boat 3 has an air side valve seating part 5, and the exhaust boat 4 has an exhaust side valve seating part 6. The intake valve seat 5 has a valve seating surface 7 on which the valve face of the intake valve (not shown) comes into contact, and the exhaust valve seat 6 has a valve seat 7 as shown in FIG. It has a valve seating surface 2 against which the valve face 8a of the exhaust valve 8 comes into contact. In this case, the exhaust valve 8 is guided by a valve guide 10. As shown in FIG. 3, in this exhaust-side valve seating portion 6, an acicular hard intermetallic compound 11 such as Mn5Si3 exists on the surface in an area ratio of 5% or more, and the acicular hard intermetallic compound 11 The valve seating surface 2 is formed by a brass-based alloyed layer 12 deposited in a direction in which the longitudinal force direction of the cylinder head 1 is substantially parallel to the inclination direction of the valve seating surface 2. The structure has a heat-affected layer 13 formed in the vicinity of the . When forming the valve seating surface 2 having such a structure, the valve seating portion 6 of the four exhaust boats in the combustion boat portion of the aluminum alloy cylinder head 1 is machined into a ring groove shape, and a brass alloy melt is inserted into the groove. After installing a ring made of lumber, output: 4 to 5 kW, beam diameter: 10 m
m, by heating with a carbon dioxide laser set at a scanning speed of 0.2 to 0.3 m/min to melt and alloy the ring and a part of the cylinder head 1,
A brass alloy layer 12 is provided on the valve seating portion 6 on the exhaust boat 4 side.
Form. At this time, by blowing an inert gas such as nitrogen gas onto the exhaust boat 4 side of the cylinder head 1 to cool it,
The acicular hard intermetallic compound 11 is formed so that its longitudinal direction is substantially parallel to the direction of inclination of the valve seating surface 9. Next, by performing appropriate finishing processing, a valve seating surface 9 inclined at a predetermined angle is formed in the brass alloy layer 12. Note that the heating means is not limited to a laser such as a carbon dioxide laser, but may also be an electron beam, plasma arc, or the like. In addition, instead of a ring made of cast brass alloy material, alloy powder of the same strength is supplied from a hopper etc. and heated to form an overlay alloy on the valve seating part.
Thereafter, the valve seating surface 2 inclined at a predetermined angle may be formed on the brass-based alloyed layer 12 by performing an appropriate finishing process. Next, the aluminum alloy cylinder head 1 in this embodiment. Table 1 shows the chemistry of the brass alloy ingot material ring and the brass alloyed layer 12 formed. Next, each cylinder head of Example 1, Example 2, and Comparative Example 1 was assembled into an engine, and a durability test was conducted under the conditions shown in Table 2. The results are shown in Table 3. Furthermore, for Example 1, a scanning electron micrograph image of the sliding surface after the end of the durability test was obtained, as shown in FIG. 4, and an Mn-X-ray image of the sliding surface was also obtained. Fifth
The results were as shown in the figure. As shown in Table 3, in the cylinder head of Comparative Example 1 in which the cobalt-based heat-resistant alloy layer was formed,
There was significant wear on the valve and valve seating surface, and cracks were observed on the valve seating surface. This is because the alloyed layer cracks during durability tests due to differences in thermal conductivity and thermal expansion coefficient and low wettability between the aluminum alloy cylinder head base material and the cobalt-based heat-resistant alloyed layer. It is thought that this caused abrasive wear, with flakes interposed between the valve face and the valve seating surface. On the other hand, such defects were not observed in the brass alloyed layers of Examples 1 and 2, and a scanning electron micrograph of the sliding surface of the cylinder head of Example 1 shown in FIG. However, the worn surface was smooth, and it was confirmed that there were no problems with durability. In addition, in the Mnm X-ray image of the sliding surface of the cylinder head of Example 1 shown in FIG. 5, the acicular white portion is a hard phase composed of Mn5Si3, and the area ratio of this acicular hard intermetallic compound is was 7.4%. The area ratio of such acicular hard intermetallic compounds is 5.
It has been confirmed through various experiments that it is better to have a content of at least %. Furthermore, it was found that in the cylinder head of Example 2 in which a certain amount of Cr and Ni was added, the wear resistance and heat resistance could be further improved.
この発明に係わるシリンダヘッドによれば、表而に針状
の硬質金属間化合物が面積率で５％以上存在し且つ前記
針状の硬質金属間化合物の長手力向がバルブ着座面の傾
斜方向とほぼ平行な方向に析出している黄銅系合金化層
によってバルブ着座面が形或されている構或としている
ので、バルブ着座面は冷却性の良好な高熱伝導でかつ耐
摩耗性の優れた契銅系合金化層により形成されたものと
なっており，アルミニウム合金製シリンダヘッド母材と
の熱伝導度および熱膨張係数の違いが小さく濡れ性も良
好なものとなっているため、熱伝導度および熱膨張係数
の違いや濡れ性の悪さによるクラックの発生がないもの
となり、耐久性に著し〈優れたバルブ着座面をもつ軽量
なシリンダヘッドが得られ、高排気温度化に対応した十
分な耐久性をもつシリンダヘッドが提供できるという著
大なる効果がもたらされる．According to the cylinder head of the present invention, the acicular hard intermetallic compound exists in an area ratio of 5% or more, and the longitudinal force direction of the acicular hard intermetallic compound is the inclination direction of the valve seating surface. Since the valve seating surface is formed by a brass-based alloy layer deposited in almost parallel directions, the valve seating surface has a structure with good cooling performance, high heat conductivity, and excellent wear resistance. It is formed of a copper-based alloy layer, and has a small difference in thermal conductivity and thermal expansion coefficient from the aluminum alloy cylinder head base material, and has good wettability. There is no cracking due to differences in thermal expansion coefficients or poor wettability, resulting in a lightweight cylinder head with outstanding durability and an excellent valve seating surface. This has the significant effect of providing a cylinder head with durability.
第１図および第２図はこの発明に係わるアルミニウム合
金製シリンダヘッドの燃焼ボート部を示すそれぞれ平面
説明図および断面説明図、第３図は黄銅系合金化層の断
面構造を示す斜面説明図、第４図は実施例１のシリンダ
ヘッドの耐久試験終了後における摺動面の走査型電子顕
微鏡による金属組織の調査結果を示す写真（４００倍）
、第５図は実施例ｌのシリンダヘッドの耐久試験終了後
における摺動面のＭ ｎ ｅ Ｘ線による金属組織の調
査結果を示す写真（４００倍）である。FIGS. 1 and 2 are an explanatory plan view and a cross-sectional view, respectively, showing the combustion boat part of an aluminum alloy cylinder head according to the present invention, and FIG. 3 is an explanatory slope view showing the cross-sectional structure of a brass alloyed layer. Figure 4 is a photograph (400x magnification) showing the results of a scanning electron microscope examination of the metallographic structure of the sliding surface of the cylinder head of Example 1 after the end of the durability test.
, FIG. 5 is a photograph (magnified at 400 times) showing the results of an investigation of the metallographic structure of the sliding surface of the cylinder head of Example 1 after the end of the durability test using Mne X-rays.
Claims (1)
リンダヘッドにおいて、表面にＭｎ＿５Ｓｉ＿３等の針
状の硬質金属間化合物が面積率で５％以上存在し且つ前
記針状の硬質金属間化合物の長手方向がバルブ着座面の
傾斜方向とほぼ平行な方向に析出している黄銅系合金化
層によってバルブ着座面が形成されていることを特徴と
するシリンダヘッド。(1) In a cylinder head made of aluminum alloy and provided with a valve seating surface, an acicular hard intermetallic compound such as Mn_5Si_3 exists in an area ratio of 5% or more on the surface, and the acicular hard intermetallic compound exists in the longitudinal direction. A cylinder head characterized in that a valve seating surface is formed by a brass-based alloy layer deposited in a direction substantially parallel to the direction of inclination of the valve seating surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23912089A JPH03105005A (en) | 1989-09-14 | 1989-09-14 | Cylinder head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23912089A JPH03105005A (en) | 1989-09-14 | 1989-09-14 | Cylinder head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03105005A true JPH03105005A (en) | 1991-05-01 |
Family
ID=17040089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23912089A Pending JPH03105005A (en) | 1989-09-14 | 1989-09-14 | Cylinder head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03105005A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106011526A (en) * | 2015-03-31 | 2016-10-12 | 威兰德-沃克公开股份有限公司 | Copper-zinc alloy, band material, sliding element and producing process thereof |
-
1989
- 1989-09-14 JP JP23912089A patent/JPH03105005A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106011526A (en) * | 2015-03-31 | 2016-10-12 | 威兰德-沃克公开股份有限公司 | Copper-zinc alloy, band material, sliding element and producing process thereof |
| CN106011526B (en) * | 2015-03-31 | 2019-06-11 | 威兰德-沃克公开股份有限公司 | Ormolu, strip material, sliding members and production method |
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