JPH0319384B2 - - Google Patents

Info

Publication number
JPH0319384B2
JPH0319384B2 JP62104055A JP10405587A JPH0319384B2 JP H0319384 B2 JPH0319384 B2 JP H0319384B2 JP 62104055 A JP62104055 A JP 62104055A JP 10405587 A JP10405587 A JP 10405587A JP H0319384 B2 JPH0319384 B2 JP H0319384B2
Authority
JP
Japan
Prior art keywords
port liner
ceramic
modulus
reinforcing material
young
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
JP62104055A
Other languages
Japanese (ja)
Other versions
JPS63268963A (en
Inventor
Toshuki Hamanaka
Setsu Harada
Fumio Hatsutori
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.)
NGK Insulators Ltd
Original Assignee
NGK Insulators 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 NGK Insulators Ltd filed Critical NGK Insulators Ltd
Priority to JP10405587A priority Critical patent/JPS63268963A/en
Priority to EP91200812A priority patent/EP0437303B1/en
Priority to EP88302531A priority patent/EP0285312B1/en
Priority to DE3852513T priority patent/DE3852513T2/en
Priority to DE3853299T priority patent/DE3853299T2/en
Priority to EP91200811A priority patent/EP0437302B1/en
Priority to DE3851638T priority patent/DE3851638T2/en
Publication of JPS63268963A publication Critical patent/JPS63268963A/en
Priority to US07/508,532 priority patent/US5055435A/en
Priority to US07/666,621 priority patent/US5260116A/en
Publication of JPH0319384B2 publication Critical patent/JPH0319384B2/ja
Granted legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features
    • F01N13/16—Selection of particular materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/46—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates
    • C04B35/462—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates
    • C04B35/478—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates based on aluminium titanates
    • 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
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/02—Surface coverings of combustion-gas-swept parts
    • 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
    • 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
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • 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
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F2001/008—Stress problems, especially related to thermal stress
    • 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
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/245—Arrangement of valve stems in cylinder heads the valve stems being orientated at an angle with the cylinder axis
    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Exhaust Silencers (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Description

【発明の詳細な説明】[Detailed description of the invention]

（産業上の利用分野） 本発明はガソリンエンジン、デイーゼルエンジ
ン等の排気ポートの内面をライニングするために
用いられるセラミツクポートライナーに関するも
のである。 （従来の技術） 近年自動車排ガスによる環境汚染が重要な社会
問題となつており、この対策としては自動車排ガ
ス中の有害物質を触媒により除去する方法が主体
となつている。この触媒として使用されている
Pt、Rh等の貴金属は資源上、コスト上の問題か
ら使用量の削減が課題となつており、また近年増
加傾向にある４バルブエンジンは排ガス温度低下
による触媒浄化性能の低下が問題となつている。
これらの問題を解決する方法の１つとして、エン
ジンの排気ポートの内面をセラミツク製のポート
ライナーによつてライニングし、その断熱作用に
より排ガス温度を上昇させることが従来から提案
されている。一般にセラミツクポートライナーの
装着についてはエンジンのシリンダーヘツドを製
造する際に、セラミツク製のポートライナーをア
ルミニウム等の金属によつて同時に鋳ぐるむ方法
が取られているが、溶融金属の固化時の収縮によ
り大きな圧縮応力が加わるため高強度セラミツク
ス材料でも鋳ぐるみ時に部分的に応力が集中する
とセラミツクが破壊してしまう問題があつた。 そこでこのような問題を解決するために、ポー
トライナーの外表面に石綿、アルミナ等のセラミ
ツクフアイバー層を形成し、その弾力により溶融
金属の固化収縮時の圧縮応力を緩和する方法が提
案されている（例えば、特開昭52−121114号公
報、特開昭59−175693号公報）。ところがこのよ
うにセラミツクフアイバーを緩衝材として介在さ
せたものは、エンジン作動による高温と振動によ
りフアイバー層が弾性を失い、ポートライナーの
脱離等の問題を生ずるうえに、鋳ぐるみ時の工数
が増加し、鋳ぐるみ作業も難しい欠点がある。ま
た特開昭60−169655ではセラミツク体外表面に少
なくとも１つの圧力に強い補強材を設けた中空管
状セラミツク体が提案されているが、セラミツク
体がテイアライト（チタン酸アルミニウム）で補
強材がジルコニアであるため熱膨脹差、ヤング率
差が大きすぎアルミ鋳ぐるみ時の熱衝撃及び応力
に耐えられず、破壊してしまう欠点がある。そし
てポートライナー自体を高強度材料により形成し
て破壊を防止する試みも数多く提案されている
が、４バルブ用エンジンに用いられる２連式のポ
ートライナーの中央部分のように外表面が内側に
くぼんだ部分では、この部分に極めて大きい応力
集中が生じるためクラツクの発生を防止すること
は困難であつた。 （発明が解決しようとする問題点） 本発明は上記のような従来の問題点を解決し
て、鋳ぐるみ時に発生する圧縮力によつてクラツ
クを発生することがなく、また使用中にポートラ
イナーの脱離を生ずるおそれもないうえ、鋳ぐる
みを容易に行うことができるセラミツクポートラ
イナーを提供することを目的とするものである。 （問題点を解決するための手段） 本発明は、焼成後に50〜2000Kgｆ／mm2のヤング
率を持つチタン酸アルミニウム質を主成分とする
撓み易いポートライナーにおいて、成形されたポ
ートライナー本体の外周面の窪んだ部分に、焼成
後のヤング率がポートライナー本体のヤング率±
1000Kgｆ／mm2以内となる撓み易い補強材を肉盛り
し一体焼成構造体としたことを特徴とするもので
ある。 第４図に示されるように、従来一般の４バルブ
エンジン用のポートライナー本体１は、２個のポ
ート２，２と単一の排気口３とを有するものであ
り、これらのポート２，２の中間部分は図示のよ
うに窪んだ部分４となつているのであるが、本発
明においては成形されたポートライナー本体１の
この窪んだ部分４に次のような撓み易い補強材５
が肉盛りされたうえ焼成され、第１図、第２図、
第３図に示されるような一体焼成構造体となつて
いる。 この補強材５としては、ポートライナー本体１
を構成する材料とヤング率が近似した材料が選定
され、選定の基準としてはヤング率の差が±1000
Kgｆ／mm2以内であることが要求される。本発明で
は、ポートライナー本体１の材料としてチタン酸
アルミニウム質を主成分とた焼成体において50〜
2000Kgｆ／mm2程度の低いヤング率を持つ外力によ
り撓み易い材料を用いたので、補強材５としても
チタン酸アルミニウム質を主成分とする同質材料
のスラリーや坏土を充填し、一体的に焼成するこ
とが好ましい。このような一体焼成構造となつた
補強材５は鋳ぐるみの際にポートライナー本体１
と一体となつて容易に弾性変形し、鋳ぐるみ金属
が凝固する際の収縮を吸収するので、これによつ
てポートライナー本体１の窪んだ部分４に生ずる
応力集中が緩和される。このためにはポートライ
ナー本体１と補強材５との界面が焼成により完全
に接合されていることが必要であり、このために
も補強材５がポートライナー本体１と同質の材料
であることが好ましい。補強材５の材質とポート
ライナー本体１の材質との間のヤング率が前記の
限定範囲以上離れると、補強材５がポートライナ
ー本体１と一体となつて弾性変形することができ
なくなる。 なお本発明において、セラミツク製のポートラ
イナー本体１を50〜2000Kgｆ／mm2という低いヤン
グ率を持つチタン酸アルミニウム質を主成分とす
る撓み易い材質としたのは、アルミニウム等の金
属によつて鋳ぐるむ際に容易に変形させ、破壊を
防止するためである。 本発明のセラミツクポートライナーを製造する
には、ポートライナー本体１を鋳込成形し、その
焼成前の生素地の段階で窪んだ部分４を補強材５
のスラリー又は坏土で肉盛りしたうえ焼成して一
体構造とする方法、あるいは鋳込成形により成形
し焼成した一定肉厚のポートライナー本体１を中
子のように鋳型中にセツトし、その外側に補強材
５のスラリーを再度鋳込み成形し、焼成する方法
等を取ることができる。 なお、第１図〜第３図にはポートライナー本体
１の窪んだ部分４の全体に補強材５を埋め込んだ
ものを示したが、補強材５をポートライナー本体
１の窪んだ部分４のうちの、最も応力集中を生じ
易い二股の基部付近にのみ肉盛りしてもよいこと
はいうまでもない。 （実施例） 実施例 １ 第１表に示される特性を持つNo.１〜No.８のポー
トライナー本体を鋳込み成形し、生素地の状態で
その窪んだ部分をNo.１と同質の補強材のペースト
で埋めて乾燥したうえ1500〜1600℃で焼成した。
次に各ポートライナー本体の内部に鋳砂を詰めて
その外周全体を肉厚７mmのアルミニウムによつて
鋳ぐるんだ。鋳砂を除去した後、クラツクの有無
を確認したところ、ヤング率の差が本発明の範囲
内にあるNo.１〜No.４はクラツクを生じなかつた
が、No.５〜No.８についてはいずれもクラツクが発
生した。 実施例 ２ 補強材としてNo.５と同質のものを選定したほか
は実施例１と同様の方法でテストを行つたとこ
ろ、No.１〜No.４にはクラツクが発生したが、本発
明の範囲内にあるNo.５〜No.８にはクラツクが生じ
なかつた。 (Industrial Application Field) The present invention relates to a ceramic port liner used for lining the inner surface of an exhaust port of a gasoline engine, diesel engine, etc. (Prior Art) In recent years, environmental pollution caused by automobile exhaust gas has become an important social problem, and the main countermeasure against this problem has been to use a catalyst to remove harmful substances from automobile exhaust gas. used as a catalyst for this
Reducing the amount of precious metals such as Pt and Rh used has become an issue due to resource and cost issues, and 4-valve engines, which have been on the rise in recent years, are facing the problem of a decline in catalyst purification performance due to a drop in exhaust gas temperature. There is.
As one method for solving these problems, it has been proposed in the past to line the inner surface of an engine's exhaust port with a ceramic port liner to increase the exhaust gas temperature due to its heat insulating effect. Generally speaking, ceramic port liners are installed by casting a ceramic port liner with a metal such as aluminum at the same time when manufacturing engine cylinder heads, but this method suffers from shrinkage when the molten metal solidifies. Because compressive stress is applied, even high-strength ceramic materials have the problem that if stress is concentrated locally during casting, the ceramic will break. In order to solve this problem, a method has been proposed in which a ceramic fiber layer made of asbestos, alumina, etc. is formed on the outer surface of the port liner, and its elasticity relieves the compressive stress caused by the solidification and contraction of molten metal ( For example, JP-A-52-121114, JP-A-59-175693). However, with ceramic fibers interposed as buffering materials, the fiber layer loses its elasticity due to the high temperatures and vibrations caused by engine operation, causing problems such as detachment of the port liner, and increases the number of man-hours required during casting. However, casting work is also difficult. Furthermore, in JP-A-60-169655, a hollow tubular ceramic body is proposed in which at least one pressure-resistant reinforcing material is provided on the outer surface of the ceramic body. Because of this, the difference in thermal expansion and Young's modulus is too large, making it unable to withstand the thermal shock and stress that occurs when aluminum is cast, resulting in breakage. Many attempts have been made to prevent breakage by forming the port liner itself from high-strength materials; However, it has been difficult to prevent cracks from occurring because an extremely large stress concentration occurs in this portion. (Problems to be Solved by the Invention) The present invention solves the conventional problems as described above, eliminates cracks caused by compressive force generated during casting, and prevents the port liner from cracking during use. It is an object of the present invention to provide a ceramic port liner which is free from the risk of detachment and which can be easily cast. (Means for Solving the Problems) The present invention provides a flexible port liner mainly composed of aluminum titanate having a Young's modulus of 50 to 2000 Kgf/mm 2 after firing. In the recessed part, the Young's modulus after firing is ± the Young's modulus of the port liner body.
It is characterized by being made into an integrally fired structure by adding a reinforcing material which is easy to bend within 1000Kgf/mm 2 . As shown in FIG. 4, a conventional port liner body 1 for a general 4-valve engine has two ports 2, 2 and a single exhaust port 3. The intermediate portion is a recessed portion 4 as shown in the figure, and in the present invention, the following flexible reinforcing material 5 is provided in the recessed portion 4 of the molded port liner main body 1.
is plated and fired, Figure 1, Figure 2,
It is an integrally fired structure as shown in FIG. As this reinforcing material 5, the port liner main body 1
A material with a Young's modulus similar to that of the material constituting the
It is required to be within Kgf/ mm2 . In the present invention, in a fired body mainly composed of aluminum titanate as the material of the port liner body 1,
Since we used a material that has a low Young's modulus of about 2000 kgf/mm 2 and is easily deflected by external force, we filled it with slurry or clay of a homogeneous material whose main component is aluminum titanate as the reinforcing material 5, and fired it integrally. It is preferable to do so. The reinforcing material 5, which has such an integrally fired structure, is attached to the port liner main body 1 during casting.
Since it easily elastically deforms together with the cast metal and absorbs the contraction when the cast metal solidifies, the stress concentration occurring in the recessed portion 4 of the port liner main body 1 is alleviated. For this purpose, it is necessary that the interface between the port liner main body 1 and the reinforcing material 5 is completely joined by firing, and for this purpose, it is preferable that the reinforcing material 5 is made of the same material as the port liner main body 1. If the Young's modulus between the material of the reinforcing material 5 and the material of the port liner main body 1 deviates beyond the above-mentioned limited range, the reinforcing material 5 will not be able to elastically deform integrally with the port liner main body 1. In the present invention, the reason why the ceramic port liner body 1 is made of a flexible material mainly composed of aluminum titanate having a low Young's modulus of 50 to 2000 Kgf/mm 2 is because it is cast from a metal such as aluminum. This is to make it easy to deform and prevent breakage when it is assembled. In order to manufacture the ceramic port liner of the present invention, the port liner main body 1 is cast-molded, and the recessed portion 4 is filled with reinforcing material 5 at the stage of the raw material before firing.
The port liner main body 1 of a certain thickness, which has been molded and fired by casting, is set in a mold like a core, and the outside of the port liner is A method such as casting the reinforcing material 5 slurry again and firing it can be used. Although FIGS. 1 to 3 show the reinforcing material 5 embedded in the entire recessed portion 4 of the port liner main body 1, the reinforcing material 5 is embedded in the recessed portion 4 of the port liner main body 1. It goes without saying that the buildup may be applied only to the vicinity of the base of the bifurcation where stress concentration is most likely to occur. (Example) Example 1 Port liner bodies No. 1 to No. 8 having the characteristics shown in Table 1 were cast and formed, and the recessed portions were filled with reinforcing material of the same quality as No. 1 in the raw material state. It was filled with paste, dried, and fired at 1,500 to 1,600 degrees Celsius.
Next, the inside of each port liner body was filled with casting sand, and the entire outer periphery was cast with aluminum having a thickness of 7 mm. After removing the casting sand, we checked for the presence of cracks, and found that Nos. 1 to 4, whose Young's modulus difference was within the range of the present invention, did not have any cracks, but Nos. 5 to 8 did not. Cracks occurred in both cases. Example 2 A test was conducted in the same manner as in Example 1, except that a material of the same quality as No. 5 was selected as the reinforcing material. Cracks occurred in Nos. 1 to 4, but the present invention No cracks occurred in No. 5 to No. 8, which were within the range.

【表】 （発明の効果） 本発明は以上の説明から明らかなように、50〜
2000Kgｆ／mm2の低ヤング率のチタン酸アルミニウ
ム質からなる撓み易いポートライナー本体の外周
面が窪んだ部分をヤング率の差が小さい撓み易い
補強材によつて埋めて一体焼成構造体とし、鋳ぐ
るみの際に全体が一体的に弾性変形するようにし
て窪み部分に生ずる応力集中を緩和したものであ
るから、従来の異質の補強材を用いたものとは異
なり鋳ぐるみ時の圧縮力によるクラツクの発生が
ないこと、従来のセラミツクフアイバーを巻いた
もののような使用中の脱離がないこと、鋳ぐるみ
を容易に行えること等の多くの利点を有するもの
である。よつて本発明は従来の問題点を一掃した
セラミツクポートライナーとして、産業の発展に
寄与するところは極めて大である。[Table] (Effects of the invention) As is clear from the above description, the present invention
The concave part of the outer circumferential surface of the flexible port liner body made of aluminum titanate with a low Young's modulus of 2000 Kgf/ mm2 is filled with a flexible reinforcing material with a small difference in Young's modulus to form an integrally fired structure. This method allows the entire body to elastically deform in one piece to alleviate the stress concentration that occurs in the recessed portion, so unlike conventional reinforcing materials that use different types of reinforcing materials, cracks caused by compressive force during casting are prevented. It has many advantages such as no generation, no detachment during use unlike conventional ceramic fiber wound products, and ease of casting. Therefore, the present invention greatly contributes to the development of industry as a ceramic port liner that eliminates the problems of the conventional art.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明のセラミツクポートライナーを
示す平面図、第２図はそのＡ−Ａ断面図、第３図
はそのＢ−Ｂ断面図、第４図は従来のセラミツク
ポートライナーの斜視図である。 １：ポートライナー本体、４：窪んだ部分、
５：補強材。 FIG. 1 is a plan view showing the ceramic port liner of the present invention, FIG. 2 is a sectional view taken along line AA, FIG. 3 is a sectional view taken along line BB, and FIG. 4 is a perspective view of a conventional ceramic port liner. 1: Port liner body, 4: Recessed part,
5: Reinforcement material.

Claims (1)

【特許請求の範囲】 １ 焼成後に50〜2000Kgｆ／mm2のヤング率を持つ
チタン酸アルミニウム質を主成分とする撓み易い
ポートライナーにおいて、成形されたポートライ
ナー本体１の外周面の窪んだ部分４に、焼成後の
ヤング率がポートライナー本体１のヤング率±
1000Kgｆ／mm2以内となる撓み易い補強材５を肉盛
りし一体焼成構造体としたことを特徴とするセラ
ミツクポートライナー。 ２ 補強材５がポートライナー本体１と同質材料
である特許請求の範囲第１項記載のセラミツクポ
ートライナー。[Claims] 1. In a flexible port liner mainly composed of aluminum titanate having a Young's modulus of 50 to 2000 Kgf/mm 2 after firing, the recessed portion 4 of the outer peripheral surface of the molded port liner main body 1 includes: The Young's modulus after firing is the Young's modulus of the port liner body 1 ±
A ceramic port liner characterized in that it is made into an integrally fired structure by overlaying a reinforcing material 5 which is easy to bend within 1000 kgf/mm 2 . 2. The ceramic port liner according to claim 1, wherein the reinforcing material 5 is made of the same material as the port liner main body 1.
JP10405587A 1987-03-24 1987-04-27 Ceramic port liner Granted JPS63268963A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
JP10405587A JPS63268963A (en) 1987-04-27 1987-04-27 Ceramic port liner
EP91200811A EP0437302B1 (en) 1987-03-24 1988-03-23 Ceramic port liners
EP88302531A EP0285312B1 (en) 1987-03-24 1988-03-23 Ceramic materials to be insert-cast and ceramic port liners
DE3852513T DE3852513T2 (en) 1987-03-24 1988-03-23 Ceramic material to be cast and ceramic duct linings.
DE3853299T DE3853299T2 (en) 1987-03-24 1988-03-23 Linings for canals.
EP91200812A EP0437303B1 (en) 1987-03-24 1988-03-23 Ceramic port liners
DE3851638T DE3851638T2 (en) 1987-03-24 1988-03-23 Ceramic feeding for channels.
US07/508,532 US5055435A (en) 1987-03-24 1990-04-12 Ceramic materials to be insert-cast
US07/666,621 US5260116A (en) 1987-03-24 1991-03-08 Ceramicm port liners

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10405587A JPS63268963A (en) 1987-04-27 1987-04-27 Ceramic port liner

Publications (2)

Publication Number Publication Date
JPS63268963A JPS63268963A (en) 1988-11-07
JPH0319384B2 true JPH0319384B2 (en) 1991-03-14

Family

ID=14370510

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10405587A Granted JPS63268963A (en) 1987-03-24 1987-04-27 Ceramic port liner

Country Status (1)

Country Link
JP (1) JPS63268963A (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3346394C2 (en) * 1983-12-22 1986-09-04 Dr.Ing.H.C. F. Porsche Ag, 7000 Stuttgart Hollow, tubular ceramic body
JPS61169241A (en) * 1985-01-23 1986-07-30 トヨタ自動車株式会社 Heat-insulating member
JPS6252174A (en) * 1986-04-05 1987-03-06 日本碍子株式会社 Engine part

Also Published As

Publication number Publication date
JPS63268963A (en) 1988-11-07

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