JPH0370845A - Structure of heat insulating piston - Google Patents
Structure of heat insulating pistonInfo
- Publication number
- JPH0370845A JPH0370845A JP20564789A JP20564789A JPH0370845A JP H0370845 A JPH0370845 A JP H0370845A JP 20564789 A JP20564789 A JP 20564789A JP 20564789 A JP20564789 A JP 20564789A JP H0370845 A JPH0370845 A JP H0370845A
- Authority
- JP
- Japan
- Prior art keywords
- heat insulating
- head base
- piston
- ceramic material
- insulating material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910010293 ceramic material Inorganic materials 0.000 claims abstract description 56
- 239000000463 material Substances 0.000 claims abstract description 28
- 239000010409 thin film Substances 0.000 claims abstract description 28
- 238000002485 combustion reaction Methods 0.000 claims abstract description 27
- 239000011810 insulating material Substances 0.000 claims description 64
- 230000002093 peripheral effect Effects 0.000 claims description 10
- 239000012212 insulator Substances 0.000 abstract description 7
- 239000000919 ceramic Substances 0.000 description 22
- 229910052581 Si3N4 Inorganic materials 0.000 description 9
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 9
- 238000005229 chemical vapour deposition Methods 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 239000000567 combustion gas Substances 0.000 description 6
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 6
- 238000009413 insulation Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- 231100000989 no adverse effect Toxicity 0.000 description 3
- 235000007173 Abies balsamea Nutrition 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 241000218685 Tsuga Species 0.000 description 2
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 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
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005234 chemical deposition 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
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003466 welding Methods 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
- 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
- F02F3/00—Pistons
- F02F3/10—Pistons having surface coverings
- F02F3/12—Pistons having surface coverings on piston heads
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野］
この発明は、断熱エンジンにおける断熱ピストンの構造
に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to the structure of an adiabatic piston in an adiabatic engine.
従来、第４図に示すような断熱ピストンの構造が開示さ
れている。第４図において、ピストンスカート部２２の
中央に形成した取付孔３１に、ヘッドベース部２１の中
央に設けた取付ボス部２８を嵌合し、両者をメタルフロ
ー２９によって固定している。この場合、ピストンの摺
動面の上部を構成するリング部２４の内周面に段部３２
を形成し、該段部３２にヘッドベース部２１の周囲部３
３を係止して、該リング部２４をピストンスカート部２
２にシール材２７を介して押圧状態に構成している。更
に、ヘッドベース部２１とリング部２４によって構成さ
れる筒状穴部に断熱層２３が形成され、該断熱Ｎ２３の
燃焼室側の面にセラミック材から成る薄板２５が配置さ
れている。なお、図中２６は断熱空気層である。Conventionally, a structure of an adiabatic piston as shown in FIG. 4 has been disclosed. In FIG. 4, a mounting boss portion 28 provided at the center of the head base portion 21 is fitted into a mounting hole 31 formed at the center of the piston skirt portion 22, and both are fixed by a metal flow 29. In this case, a stepped portion 32 is formed on the inner peripheral surface of the ring portion 24 that constitutes the upper part of the sliding surface of the piston.
, and the peripheral portion 3 of the head base portion 21 is formed on the stepped portion 32.
3, and the ring part 24 is attached to the piston skirt part 2.
2 is configured to be in a pressed state via a sealing material 27. Furthermore, a heat insulating layer 23 is formed in the cylindrical hole formed by the head base part 21 and the ring part 24, and a thin plate 25 made of a ceramic material is arranged on the surface of the heat insulating layer N23 on the combustion chamber side. Note that 26 in the figure is an insulating air layer.
上記のような断熱ピストンの構造として、例えば、特開
昭６３−３０２１６４号公報に開示されている。該断熱
ピストンの構造を第５図を参照して概説する。該断熱ピ
ストンは、中央に取付ボス部４４を有するセラミック材
と熱膨張係数がほぼ等しい材料から成るピストンへンド
部４Ｉと、中央に取付ボス部４４が嵌合する中央取付孔
５２を備えた金属製ピストンスカート部４２とから構成
されている。更に、ピストンヘッド部４１の取付ボス部
４４とピストンスカート部４２の中央取付孔５２とは、
金属リング５１のメタルフローによって固定されている
。ピストンヘッド部４１とピストンスカート部４２との
中央部の当接部位には断熟ガスケ７ ｔ・である断熱緩
衝材４８が押圧状態に介在している。また、ピストンヘ
ッド部４１とピストンスカート部４２との間には、断熱
空気層４９が形成されている。更に、熱容量を小さくす
るため極めて薄く形成したセラもンク薄板４５が、燃焼
室に面するようにピストンヘッド部４１に断熱材４３を
介して配置されていることである。セラミック薄板４５
の外周部には、同様な材料で形成されたセラミックリン
グ４６が嵌合しており、セラミンク薄板４５とセラミッ
クリング４６とは、接触部で（ＶＤ （化学草着）によ
って接合されている。セラくツタリング４６の内周面に
は段部５６が形成されており、ピストンヘッド部４１の
外周部がセラもツタリング４６の段部５６に当接するよ
うにセラミックリング４６に嵌合している。The structure of the heat insulating piston as described above is disclosed, for example, in Japanese Patent Application Laid-Open No. 63-302164. The structure of the heat insulating piston will be outlined with reference to FIG. The heat insulating piston includes a piston end portion 4I made of a material having a coefficient of thermal expansion substantially equal to that of a ceramic material having a mounting boss portion 44 in the center, and a metal mounting hole 52 in the center into which the mounting boss portion 44 fits. It is composed of a piston skirt portion 42 made of steel. Furthermore, the mounting boss portion 44 of the piston head portion 41 and the central mounting hole 52 of the piston skirt portion 42 are as follows.
It is fixed by the metal flow of the metal ring 51. A heat insulating cushioning material 48 made of a mature gasket 7t is interposed in a pressed state at the central abutment area between the piston head portion 41 and the piston skirt portion 42. Further, a heat insulating air layer 49 is formed between the piston head portion 41 and the piston skirt portion 42. Furthermore, a ceramic thin plate 45 formed extremely thin in order to reduce heat capacity is arranged on the piston head portion 41 via a heat insulating material 43 so as to face the combustion chamber. Ceramic thin plate 45
A ceramic ring 46 made of the same material is fitted onto the outer periphery of the ceramic ring 46, and the thin ceramic plate 45 and the ceramic ring 46 are bonded by (VD (chemical welding)) at the contact area. A stepped portion 56 is formed on the inner peripheral surface of the ceramic ring 46, and the outer peripheral portion of the piston head portion 41 is fitted into the ceramic ring 46 such that the outer peripheral portion of the piston head portion 41 comes into contact with the stepped portion 56 of the ceramic ring 46.
セラミック薄板４５、セラミックリング４６及びピスト
ンヘッド部４１によって形成される空間部には、断熱材
４３が封入されている。この断熱材４３は、チタン酸カ
リウムウィスカー、ジルコニアファイバー等の材料から
成る。ピストンヘッド部４１がピストンスカート部４２
に押圧状態に取付けられることによって、ピストンヘッ
ド部４１の外周部がセラ業ノクリング４６の段部５６に
押し付けられ、セラミックリング４６がピストンスカー
ト部４２の周囲部に押圧される。また、セラミックリン
グ４６とピストンスカート部４２との間のシールのため
、ガスケットであるカーボンシール４７が介在されてい
る。A heat insulating material 43 is enclosed in a space formed by the ceramic thin plate 45, the ceramic ring 46, and the piston head portion 41. This heat insulating material 43 is made of materials such as potassium titanate whiskers and zirconia fibers. The piston head portion 41 is the piston skirt portion 42
By being attached in a pressed state, the outer peripheral portion of the piston head portion 41 is pressed against the stepped portion 56 of the ceramic ring 46, and the ceramic ring 46 is pressed against the peripheral portion of the piston skirt portion 42. Furthermore, a carbon seal 47, which is a gasket, is interposed for sealing between the ceramic ring 46 and the piston skirt portion 42.
ところで、セラミンク材を断熱材又は耐熱材として利用
するピストン等の断熱エンジン部材において、断熱特性
を十分に得ることは極めて困難なことである。セラミッ
ク材が燃焼室側の高温に晒される状態であり、そのため
熱シッンクを受け、セラミック材の強度上の問題がある
。また、断熱のため壁面のセラミック材の厚さを厚くす
ると、熱容量が大きくなり、吸入工程時に吸入空気が燃
焼室から多く受熱して高温になり、その熱が吸気に影響
し、吸入効率が低下して空気が吸入されなくなるという
現象が生じる反面、膨張工程では断熱性を向上させなけ
ればならないという問題がある。By the way, it is extremely difficult to obtain sufficient heat-insulating properties in heat-insulating engine members such as pistons that utilize ceramic material as a heat-insulating material or heat-resistant material. The ceramic material is exposed to high temperatures on the side of the combustion chamber, and as a result is subject to heat sink, which poses problems in terms of the strength of the ceramic material. Additionally, if the thickness of the ceramic material on the wall is increased for insulation purposes, the heat capacity will increase, and during the intake process, the intake air will receive more heat from the combustion chamber and become hotter, and this heat will affect the intake air, reducing intake efficiency. On the other hand, there is a problem in that the expansion process requires improved insulation properties.
そこで、上記問題を解決するため、前掲特開昭６３−３
０２１６４号公報に開示した断熱ピストンの構造は、上
記のように構成することによって、極めて高度の断熱性
を得ると共に、燃焼ガスに晒されて高温になる燃焼室側
に面するピストンヘッドの表面部の熱容量を可及的に小
さく構成し、吸入効率及びサイクル効率を向上させ、し
かも熱ショックを受けても強度上の問題が生しることな
く、耐熱性、耐腐食性、耐変形性を向上させ、しかも安
定した取付状態を得ることができ、更に爆発時にピスト
ンヘッドに作用する圧力を好ましい状態で受は止めるこ
とができる構造に構成し、ピストンヘッドとピストンス
カートとの間のシール機能を向上させたものである。Therefore, in order to solve the above problem,
The structure of the heat-insulating piston disclosed in Publication No. 02164 achieves extremely high heat-insulating properties by configuring as described above, and the surface portion of the piston head facing the combustion chamber side that is exposed to combustion gas and becomes hot. The heat capacity is made as small as possible to improve suction efficiency and cycle efficiency, and there are no problems with strength even when subjected to thermal shock, improving heat resistance, corrosion resistance, and deformation resistance. It has a structure that allows a stable mounting condition to be obtained, and also allows the pressure that acts on the piston head during an explosion to be received and stopped in a favorable condition, improving the sealing function between the piston head and piston skirt. This is what I did.
しかしながら、上記断熱ピストンの構造において、ヘッ
ドベース部と燃焼室側に配置したセラミンク薄板との間
に配置した断熱材として、ムライト、アルミナ、チタン
酸カリウム、ジルコニア等のウィスカー或いはファイバ
ーから構成し、そして、セラミック薄板及びセラミック
リングを窒化珪素から構成している。そのため、断熱材
と周囲のセラミック薄板及びセラミックリングとの材質
が異なるため、両者間の熟膨張差が発生し、しかも、両
者間の接合部をＣＶＤ （化学葵着）或いはコーティン
グ等で接合した場合には、断熱材を保持する強度はなく
、断熱材とセラミック薄板及びセラミノクリングとの接
合部が剥離、クランク等が発生する原因となり、不具合
が発生する。However, in the structure of the above-described heat-insulating piston, the heat insulating material disposed between the head base portion and the ceramic thin plate disposed on the combustion chamber side is composed of whiskers or fibers of mullite, alumina, potassium titanate, zirconia, etc., and , the ceramic thin plate and the ceramic ring are made of silicon nitride. Therefore, since the materials of the insulation material and the surrounding ceramic thin plate and ceramic ring are different, a difference in thermal expansion occurs between the two, and furthermore, if the joint between the two is joined by CVD (chemical deposition) or coating, etc. does not have the strength to hold the heat insulating material, and the joints between the heat insulating material, the ceramic thin plate, and the ceramino ring may peel or crack, causing problems.
この発明の目的は、上記の問題点を解決することであり
、ピストンヘッド部に極めて高度の断熱性を得ると共に
、燃焼ガスに晒されて高温になる燃焼室側に面するピス
トンヘッドの表面部の耐熱性を確保し且つ該表面部の熱
容量を可及的に小さく構成してガス温度への追従性を向
上して吸入効率を向上させるように、該表面部を窒化珪
素（ＳｉｉＮ４）、炭化珪素（ＳｉＣ）等のセラミック
材料で薄膜に構成し、特に、該薄膜及びセラミック材料
から成るヘッドベース部に対して内部に収容した断熱材
を同一セラミック材料のウィスカー焼成材を用いて堅固
に接合し且つ強度を確保した断熱ピストンの構造を提供
することである。The purpose of this invention is to solve the above-mentioned problems, and to provide an extremely high degree of heat insulation to the piston head, and to provide the surface of the piston head facing the combustion chamber side, which is exposed to combustion gas and becomes hot. The surface portion is made of silicon nitride (SiiN4), carbide, etc. to ensure heat resistance and to minimize the heat capacity of the surface portion to improve followability to gas temperature and improve suction efficiency. A thin film is made of a ceramic material such as silicon (SiC), and in particular, a heat insulating material housed inside the head base made of the thin film and the ceramic material is firmly bonded using a whisker fired material of the same ceramic material. Another object of the present invention is to provide a heat insulating piston structure that ensures strength.
この発明は、上記の目的を達成するために、次のように
構成されている。即ち、この発明は、ピストンスカート
部に取付けたセラミック材から成るヘッドベース部、該
ヘッドベース部に接合した同一セラミック材のウィスカ
ー焼成材から成る断熱材、及び該断熱材の燃焼室側の面
及び摺動側の面に接合した同一セラミック材から成る薄
膜、から構成した断熱ピストンの構造に関する。In order to achieve the above object, the present invention is configured as follows. That is, the present invention provides a head base part made of a ceramic material attached to a piston skirt part, a heat insulating material made of a whisker fired material of the same ceramic material joined to the head base part, and a surface of the heat insulating material on the combustion chamber side. This invention relates to the structure of a heat-insulating piston made of a thin film made of the same ceramic material bonded to the sliding surface.
又は、この発明は、ピストンスカート部に取付は且つ摺
動面を備えたセラミック材から成るヘッドベース部、該
ヘッドベース部と一体構造で摺動面上部を形成する筒体
、該筒体で形成される筒状穴部に配置され且つ前記ヘッ
ドベース部の上面に接合した同一セラ果フク材のウィス
カー焼成材から成る断熱材、及び該断熱材の燃焼室側の
面に接合した同一セラミック材から成る薄膜から構成し
た断熱ピストンの構造に関する。Alternatively, the present invention provides a head base part made of a ceramic material that is attached to the piston skirt part and has a sliding surface, a cylinder body integrally formed with the head base part and forming an upper part of the sliding surface, and a head base part formed of the cylinder body. A heat insulating material made of a whisker fired material of the same ceramic material placed in the cylindrical hole portion and bonded to the upper surface of the head base portion, and a heat insulating material made of the same ceramic material bonded to the combustion chamber side surface of the heat insulating material. This invention relates to the structure of a heat insulating piston made of a thin film made of
或いは、この発明は、ピストンスカート部に取付は且つ
摺動面を備えたセラミック材から成るヘッドベース部、
該ヘッドベース部と一体構造で摺動面上部を形成する筒
体、該筒体で形成される筒状穴部に配置され且つ前記筒
体の内周面に接合した同一セラミック材のウィスカー焼
成材から成る断熱材、及び該断熱材の燃焼室側の面に接
合した同一セラくツク材から成る薄膜から構成した断熱
ピストンの構造に関する。Alternatively, the present invention provides a head base portion made of a ceramic material that is attached to the piston skirt portion and has a sliding surface;
A cylindrical body integrally formed with the head base portion and forming the upper part of the sliding surface, and a whisker firing material made of the same ceramic material disposed in the cylindrical hole formed by the cylindrical body and bonded to the inner circumferential surface of the cylindrical body. The present invention relates to a heat insulating piston structure comprising a heat insulating material made of a heat insulating material and a thin film made of the same ceramic material bonded to the surface of the heat insulating material on the combustion chamber side.
この発明による断熱ピストンの構造は、以上のように構
成されており、次のように作用する。即ち、この発明は
、ピストンスカート部に取付けたセラミック材から成る
ヘッドベース部に接合した同一セラミック材のウィスカ
ー焼成材から成る断熱材、及び該断熱材の燃焼室側の面
及び摺動側の面に接合した同一セラミック材から成る薄
膜からＩ或するか、或いは、ヘッドベース部と一体構造
で摺動面上部を形成する筒体、該筒体で形成される筒状
穴部に配置され且つ前記筒体の内周面又は前記ヘッドベ
ース部の上面に接合した同一セラミック材のウィスカー
焼成材から成る断熱材、及び該ｌｆｒ熱材の燃焼室側の
面に接合した同一セラミック材から成る薄膜から構成し
たので、前記断熱材は前記へソドヘース部及び断熱材外
面に配置した前記薄膜と同一のセラミック材料で構成さ
れることになり、前記断熱材の両者に対する接合が堅固
になり信頼性に冨んだ強度を確保できる。更に、前記断
熱材による高度の断熱性を確保できると共に、燃焼ガス
に晒されて高温になるピストンヘッドの表面部に位置す
る前記薄膜の厚さを可及的に薄く構成でき、該薄膜節ち
表面部の熱容量を可及的に小さく構成することができ、
高度の耐熱性、耐変形性、耐腐食性を得ることができ、
吸入効率を向上させることができる。The structure of the heat insulating piston according to the present invention is constructed as described above, and operates as follows. That is, the present invention provides a heat insulating material made of whisker fired material of the same ceramic material joined to a head base part made of a ceramic material attached to a piston skirt part, and a surface of the heat insulating material on the combustion chamber side and a surface on the sliding side. or a cylindrical body formed integrally with the head base part and forming the upper part of the sliding surface; Consisting of a heat insulating material made of a whisker fired material of the same ceramic material bonded to the inner circumferential surface of the cylinder or the upper surface of the head base portion, and a thin film made of the same ceramic material bonded to the combustion chamber side surface of the IFR heat material. Therefore, the heat insulating material is made of the same ceramic material as the thin film disposed on the umbilical heel portion and the outer surface of the heat insulating material, and the bonding of the heat insulating material to both is strong, increasing reliability. Strength can be ensured. Furthermore, it is possible to ensure a high degree of heat insulation by the heat insulating material, and also to make the thickness of the thin film located on the surface of the piston head, which is exposed to combustion gas and becomes high temperature, as thin as possible, and the thin film joints can be made as thin as possible. The heat capacity of the surface area can be made as small as possible,
A high degree of heat resistance, deformation resistance, and corrosion resistance can be obtained.
Inhalation efficiency can be improved.
以下、図面を参照して、この発明による断熱ピストンの
構造の実施例を＃述する。Hereinafter, embodiments of the structure of the heat insulating piston according to the present invention will be described with reference to the drawings.
第１図において、この発明の一実施例である断熱ピスト
ンの構造が示されている。断熱ピストンについては、主
として、ヘッドベース部１と金属製ピストンスカート部
２とから成る。このヘソドベース部１は、窒化珪素（Ｓ
ｉ、Ｎ、） 、炭化珪素（ＳｔＣ）等のセラミック材料
から構成され、中央部に取付ボス部８を有する。このヘ
ッドベース部１そのものには燃焼室が形成されておらず
、ヘソドベース部１の燃焼室側はフラットな形状に構成
されている。ピストンスカート部２には、中央部にヘッ
ドベース部１の取付ボス部８が嵌合する中央取付孔１２
が形成されている。このヘソドベース部１の取付ボス部
８をピストンスカート部の中央取付孔１２に嵌合すると
共に、更に、取付ボス部８に形成した嵌合溝とピストン
スカート部２の中央取付孔１２に形成した嵌合溝とに跨
がって金属リング９をメタルフローによって変形収容さ
れることによって、ヘッドベース部ｌはピストンスカー
ト部２に対して押圧状態に係止される。更に、ヘソドベ
ース部１の外周下端面とピストンスカート部２の外周上
端面との当接部位には、シール部材７が押圧状態に介在
している。また、ヘソドベース部１とピストンスカート
部２との間には、断熱空気層６が形成されている。FIG. 1 shows the structure of an adiabatic piston according to an embodiment of the present invention. The heat insulating piston mainly consists of a head base part 1 and a metal piston skirt part 2. This hesode base portion 1 is made of silicon nitride (S
i, N, ), is made of a ceramic material such as silicon carbide (StC), and has a mounting boss portion 8 in the center. A combustion chamber is not formed in the head base portion 1 itself, and the combustion chamber side of the head base portion 1 is configured to have a flat shape. The piston skirt portion 2 has a central mounting hole 12 in which the mounting boss portion 8 of the head base portion 1 is fitted.
is formed. The mounting boss portion 8 of the hemlock base portion 1 is fitted into the central mounting hole 12 of the piston skirt portion, and the fitting groove formed in the mounting boss portion 8 and the fitting hole formed in the central mounting hole 12 of the piston skirt portion 2 are also fitted. By deforming and housing the metal ring 9 across the matching groove by the metal flow, the head base portion 1 is locked against the piston skirt portion 2 in a pressed state. Further, a sealing member 7 is interposed in a pressed state at a portion where the lower outer end surface of the hesode base portion 1 and the upper outer end surface of the piston skirt portion 2 come into contact. Further, a heat insulating air layer 6 is formed between the hemlock base portion 1 and the piston skirt portion 2.
この発明による断熱ピストンの構造は、上記のような構
成において、特に、次の構成に特徴を有する。即ち、こ
の断熱ピストンは、ヘッドベース部ｌに接合した同一セ
ラミック材のウィスカー焼成材から成る断熱層を構成す
る断熱材３、及び該断熱材３の燃焼室側の面１０及び摺
動側の面１１に接合した同一セラミック材から成る薄膜
５を有することである。断熱材３は、窒化珪素（ＳｉＪ
ｎ）、炭化珪素（ＳｉＣ）等のセラミック材料のウィス
カー焼成材から構成されており、該ウィスカー焼成材を
同一セラミック材料から成るヘソドベース部１の上面４
に接合されている。更に、断熱材３の外面に配置された
薄膜５は、同一材質の窒化珪素（Ｓｉ３Ｎａ） 、炭化
珪素（ＳｉＣ）等のセラミック材料から戒り、断熱材３
の燃焼ガスに晒される側即ち燃焼室側の面１０及びシリ
ンダライナに対する摺動側の面１１に対して、ＣＶＤ
（化学蒸着）或いはコーティング等で断熱材３に接合す
ることによって配置できる。それ故に、この薄膜５は、
燃焼室に晒される面を構成すると共にシリンダライナに
対する摺動面を提供し、しかも可及的に薄肉に構成でき
るので、燃焼ガスに晒される面の熱容量を小さくするこ
とができ且つ耐熱性に冨んだものに構成できる。この断
熱材３は、窒化珪素（ＳｉＪ４）、炭化珪素（ＳｉＣ）
等のセラミック材料のウィスカー焼成材から成り、断熱
機能を果たすと共に、爆発時にセラミック製の薄膜５に
作用する圧力を受は止める構造材として機能することが
できる。この断熱ピストンの構造については、爆発によ
る圧縮力を、断熱材３によって均等に受ける必要があり
、そのためにもヘッドベース部１の上面４及び薄膜５は
、平らな形状即ちフラットな形状に構成されている。The structure of the heat insulating piston according to the present invention is particularly characterized by the following structure in the above structure. That is, this heat insulating piston includes a heat insulating material 3 constituting a heat insulating layer made of whisker fired material of the same ceramic material joined to the head base part l, and a surface 10 on the combustion chamber side and a surface on the sliding side of the heat insulating material 3. 11, having a thin film 5 made of the same ceramic material bonded to 11. The heat insulating material 3 is made of silicon nitride (SiJ
n) is composed of a whisker fired material of a ceramic material such as silicon carbide (SiC), and the whisker fired material is attached to the upper surface 4 of the hesode base portion 1 made of the same ceramic material.
is joined to. Furthermore, the thin film 5 disposed on the outer surface of the heat insulating material 3 should not be made of ceramic materials such as silicon nitride (Si3Na) or silicon carbide (SiC), which are the same material.
CVD is applied to the surface 10 on the side exposed to combustion gas, that is, on the combustion chamber side, and the surface 11 on the sliding side with respect to the cylinder liner.
It can be arranged by bonding to the heat insulating material 3 (chemical vapor deposition) or by coating or the like. Therefore, this thin film 5 is
It forms the surface exposed to the combustion chamber and provides a sliding surface for the cylinder liner, and can be made as thin as possible, so the heat capacity of the surface exposed to combustion gas can be reduced and it has high heat resistance. It can be configured into This heat insulating material 3 is made of silicon nitride (SiJ4), silicon carbide (SiC)
It is made of a whisker-fired ceramic material such as, for example, and can perform a heat insulating function and also function as a structural material that absorbs the pressure that acts on the ceramic thin film 5 in the event of an explosion. Regarding the structure of this heat-insulating piston, it is necessary that the compressive force caused by the explosion is evenly received by the heat-insulating material 3, and for this purpose, the upper surface 4 and thin film 5 of the head base portion 1 are configured to have a flat shape. ing.
次に、この発明による断熱ピストンの構造の別の実施例
を、第２図を参照して説明する。この断熱ピストンの構
造は、上記実施例と比較して、ヘッドベース部１の形状
が若干相違する以外は、同一の構成及び同一の機能を有
しているものであるので、同一の部品については同一の
符号を付し、重複する説明は省略する。ヘッドベース部
１は、上記と同様にピストンスカート部２に取付けるが
、ピストンヘノドの上端面まで延びる摺動面１３を備え
ている。即ち、ヘンドベース部１は、周囲上端部に薄肉
の筒体１５を一体構造に有しており、従って、燃焼室側
の面には周囲が筒体１５即ち薄肉の壁部で構成される筒
状穴部１４が形成されている。筒体１５で形成される筒
状穴部１４には、該筒体１５を構成するセラミンク材料
と同一材質の窒化珪素（ＳｉＪ４） 、炭化珪素（Ｓｉ
Ｃ）等のセラミック材料のウィスカー焼成材から成る断
熱材３が配置され断熱層を構成している。この断熱材３
は筒状穴部１４の底面即ちヘソドベース部１の上面４に
おいて接合され、断熱材３の燃焼室側の面１０には、該
断熱材３を構成するセラミック材料と同一材料、即ち、
窒化珪素（ＳｉｚＮ４） 、炭化珪素（ＳｉＣ）等のセ
ラミック材料から成る薄膜５がＣＶＤ（化学蒸着）或い
はコーティング等で接合されている。Next, another embodiment of the structure of the heat insulating piston according to the present invention will be described with reference to FIG. The structure of this heat-insulating piston is the same as that of the above-mentioned embodiment, except that the shape of the head base portion 1 is slightly different, and has the same function. The same reference numerals are used, and duplicate explanations are omitted. The head base portion 1 is attached to the piston skirt portion 2 in the same manner as described above, but is provided with a sliding surface 13 extending to the upper end surface of the piston head. That is, the hend base portion 1 has a thin-walled cylindrical body 15 in an integral structure at the upper end of the periphery, and therefore, on the side facing the combustion chamber, there is a cylindrical body 15 around the periphery, that is, a cylindrical body formed of a thin-walled portion. A hole 14 is formed. The cylindrical hole 14 formed in the cylindrical body 15 is filled with silicon nitride (SiJ4), silicon carbide (Si
A heat insulating material 3 made of a whisker fired ceramic material such as C) is arranged to constitute a heat insulating layer. This insulation material 3
are joined at the bottom surface of the cylindrical hole 14, that is, the upper surface 4 of the hesode base portion 1, and the combustion chamber side surface 10 of the heat insulating material 3 is made of the same material as the ceramic material constituting the heat insulating material 3, i.e.,
A thin film 5 made of a ceramic material such as silicon nitride (SizN4) or silicon carbide (SiC) is bonded by CVD (chemical vapor deposition) or coating.
更に、この発明による断熱ピストンの構造の他の実施例
を、第３図を参照して説明する。この断熱ピストンの構
造は、第２図に示す実施例と比較して、断熱材の接合部
位が若干相違する以外は、同一の構成及び同一の機能を
有しているものであるので、同一の部品については同一
の符号を付し、重複する説明は省略する。断熱材３はヘ
ッドベース部ｌに形成した筒体１５の内周面即ち接合部
１６で接合されている。即ち、ヘッドベース部ｌの外周
下端面とピストンスカート部２の外周上端面との間にシ
ール部材７が介在しているが、該シール部材７の良好な
シール状態を確保するため、ヘッドベース部ｌの中央の
取付ボス部８に下方への力が作用して、ヘッドベース部
１の上面４と断熱材３の下面１８との間に隙間１７が発
生する。この現象が発生したとしても、ヘッドベース部
１の周囲上端部の筒体１５の内周面で断熱材３を接合す
ることによって、接合部１６が′＃Ｔ熱材３の外周部位
であるので、シールのために付勢された力によって該接
合部１６の接合状態を剥離する力は作用せず、該接合部
１６に対する悪影響は発生せず、へ、ドベース部１と断
熱材３との強固な接合状態を維持でき、更に断熱材３の
上面１０にＣＶＤ（化学蒸着）或いはコーティング等で
接合した薄膜５との接合状態にも悪影響を及ぼすことが
ない。Furthermore, another embodiment of the structure of the heat insulating piston according to the present invention will be described with reference to FIG. The structure of this heat-insulating piston is the same as that of the embodiment shown in Fig. 2, except that the joining part of the heat-insulating material is slightly different. The same reference numerals are given to the parts, and duplicate explanations will be omitted. The heat insulating material 3 is joined at the inner circumferential surface of a cylindrical body 15 formed on the head base portion l, that is, at a joint portion 16. That is, the seal member 7 is interposed between the outer circumferential lower end surface of the head base portion l and the outer circumferential upper end surface of the piston skirt portion 2, and in order to ensure a good sealing state of the seal member 7, the head base portion A downward force acts on the mounting boss portion 8 at the center of the head base portion 1, and a gap 17 is generated between the upper surface 4 of the head base portion 1 and the lower surface 18 of the heat insulating material 3. Even if this phenomenon occurs, by joining the heat insulating material 3 to the inner peripheral surface of the cylindrical body 15 at the upper end of the periphery of the head base portion 1, the joint portion 16 is the outer peripheral part of the '#T heat material 3. The force applied for sealing does not cause any force to peel off the bonded state of the bonded portion 16, and there is no adverse effect on the bonded portion 16. Furthermore, the bonding condition with the thin film 5 bonded to the upper surface 10 of the heat insulating material 3 by CVD (chemical vapor deposition), coating, etc. is not adversely affected.
この発明による断熱ピストンの構造は、以上のように構
成されているので、次のような特有の効果を奏する。即
ち、この断熱ピストンの構造は、ピストンスカート部に
取付けたセラミック材から成るヘッドベース部、該ヘッ
ドベース部に接合した同一セラＳ ＋７り材のウィスカ
ー焼成材から成る断熱材、及び該断熱材の燃焼室側の面
及び摺動側の面に接合した同一セラミック材から成る薄
膜から構成したので、前記断熱材は前記ヘッドベース部
及び断熱材外面に配置した前記薄膜と同一のセラミック
材料で構成されることになり、前記断熱材の両者に対す
る接合が堅固になり強度を確保できる。更に、前記断熱
材による高度の断熱性を確保できると共に、燃焼ガスに
晒されて高温になるピストンヘッドの表面部に位置する
前、記薄膜の厚さを可及的に薄く構成でき、該薄膜部ち
表面部の熱容量を可及的に小さく構成することができ、
高度の耐熱性、耐変形性、耐腐食性を得ることができ、
吸入効率を向上させることができる。Since the structure of the heat insulating piston according to the present invention is configured as described above, it has the following unique effects. That is, the structure of this heat insulating piston consists of a head base part made of a ceramic material attached to the piston skirt part, a heat insulating material made of a whisker fired material made of the same ceramic material bonded to the head base part, and a heat insulating material made of a whisker fired material made of the same ceramic material. Since it is composed of a thin film made of the same ceramic material bonded to the combustion chamber side surface and the sliding side surface, the heat insulating material is made of the same ceramic material as the thin film disposed on the head base portion and the outer surface of the heat insulating material. As a result, the heat insulating material can be firmly bonded to both of the heat insulating materials to ensure strength. Further, it is possible to ensure a high degree of heat insulation by the heat insulating material, and also to make the thickness of the thin film as thin as possible before it is located on the surface of the piston head that is exposed to combustion gas and becomes hot. The heat capacity of the surface area can be made as small as possible,
A high degree of heat resistance, deformation resistance, and corrosion resistance can be obtained.
Inhalation efficiency can be improved.
或いは、この断熱ピストンの構造は、ピストンスカート
部に取付は且つ摺動面を備えたセラミック材から成るヘ
ッドベース部、該ヘッドベース部と一体構造で摺動面上
部を形成する筒体、該筒体で形成される筒状穴部に配置
され且つ前記へラドベース部の上面に接合した同一セラ
ミック材のウィスカー焼成材から成る断熱材、及び該断
熱材の燃焼室側の面に接合した同一セラミック材から成
る薄膜から構成したので、前記断熱材を前記へラドベー
ス部内に確実に且つ安定して収容できる。Alternatively, the structure of this heat-insulating piston includes a head base part made of a ceramic material that is attached to the piston skirt part and has a sliding surface, a cylindrical body integrally constructed with the head base part and forming an upper part of the sliding surface, and the cylinder. a heat insulating material made of a whisker fired material of the same ceramic material disposed in a cylindrical hole formed by the body and bonded to the upper surface of the helad base portion; and a same ceramic material bonded to the combustion chamber side surface of the heat insulating material. The heat insulating material can be reliably and stably housed in the helad base portion.
しかも、前記ヘッドベース部の中央の取付ボス部に下方
への力が作用して、前記へラドベース部の上面と断熱材
の下面との間に隙間が発生したとしても、接合部位が外
周部位であるので、接合に対する悪影響は発生せず、前
記ヘッドベース部と前記断熱材との強固な接合状態を維
持でき、更に、前記断熱材の上面に接合した前記薄膜と
の接合状態にも悪影響を及ぼすことがない。Moreover, even if a downward force is applied to the mounting boss at the center of the head base and a gap is generated between the top surface of the head base and the bottom surface of the heat insulator, the joint portion will be at the outer periphery. Therefore, there is no adverse effect on the bonding, and a strong bonding state between the head base portion and the heat insulating material can be maintained, and furthermore, there is no adverse effect on the bonding state with the thin film bonded to the upper surface of the heat insulating material. Never.
又は、この断熱ピストンの構造は、ピストンスカート部
に取付は且つ摺動面を備えたセラミック材から成るヘッ
ドベース部、該ヘッドベース部と一体構造で摺動面上部
を形成する筒体、該筒体で形成される筒状穴部に配置さ
れ且つ前記筒体の内周面に接合した同一セラミック材の
ウィスカー焼成材から成る断熱材、及び該断熱材の燃焼
室側の酊に接合した同一セラミック材から成る薄膜から
構成したので、前記断熱材を前記ヘッドベース部内に確
実に且つ安定して収容できる。しかも、前記断熱材を前
記ヘッドベース部に対して堅固に接合することができる
。例えば、前記断熱材と前記ヘッドベース部との間に大
きな引張力が作用しない場合には、前記断熱材を前記へ
ラドベース部に形成した前記筒状穴部の底面に接合する
ことができる。Alternatively, the structure of this heat-insulating piston includes: a head base part made of a ceramic material that is attached to the piston skirt part and has a sliding surface; a cylindrical body that is integrated with the head base part and forms the upper part of the sliding surface; and the cylinder. a heat insulating material made of a whisker fired material of the same ceramic material disposed in a cylindrical hole formed by the body and bonded to the inner circumferential surface of the cylindrical body; and a same ceramic bonded to the combustion chamber side of the heat insulating material. Since the heat insulating material is constructed from a thin film made of material, the heat insulating material can be reliably and stably accommodated within the head base portion. Moreover, the heat insulating material can be firmly joined to the head base portion. For example, if a large tensile force does not act between the heat insulating material and the head base portion, the heat insulating material may be bonded to the bottom surface of the cylindrical hole formed in the head base portion.
第１図はこの発明による断熱ピストンの構造の一実施例
を示す断面図、第２図はこの発明による断熱ピストンの
構造の別の実施例を示す断面図、第３図はこの発明によ
る断熱ピストンの構造の更に別の実施例を示す断面図、
第４図は従来の断熱ピストンの構造の一例を示す断面図
、及び第５図は従来の断熱ピストンの構造の別の例を示
す断面図である。
１−−一−−−ヘノドベース部、２−−−−−・ピスト
ンスカート部、３−一−−−−断熱材、４−−−−−上
面、５・−−一薄膜、６・−・・−・断熱空気層、１０
−−一＝−燃焼室側の面、１１−・摺動側の面、１３−
・−・−摺動面、１４−一−−−−筒状穴部、１５−−
−−一筒体、１６一−−接合部。FIG. 1 is a cross-sectional view showing one embodiment of the structure of the heat-insulating piston according to the present invention, FIG. 2 is a cross-sectional view showing another embodiment of the structure of the heat-insulating piston according to the present invention, and FIG. A sectional view showing yet another example of the structure of
FIG. 4 is a sectional view showing an example of the structure of a conventional heat insulating piston, and FIG. 5 is a sectional view showing another example of the structure of a conventional heat insulating piston. 1--1----henod base part, 2------piston skirt part, 3------insulating material, 4-----top surface, 5--1 thin film, 6--・-・Insulating air layer, 10
--1=-Combustion chamber side surface, 11-・Sliding side surface, 13-
・--Sliding surface, 14--- Cylindrical hole, 15--
--One cylindrical body, 16 one --Joint part.
Claims (3)
成るヘッドベース部、該ヘッドベース部に接合した同一
セラミック材のウイスカー焼成材から成る断熱材、及び
該断熱材の燃焼室側の面及び摺動側の面に接合した同一
セラミック材から成る薄膜から構成した断熱ピストンの
構造。(1) A head base part made of a ceramic material attached to the piston skirt part, a heat insulating material made of whisker fired material of the same ceramic material joined to the head base part, and the combustion chamber side surface and sliding side of the heat insulating material structure of an insulated piston consisting of a thin film of the same ceramic material bonded to the surface of the
セラミック材から成るヘッドベース部、該ヘッドベース
部と一体構造で摺動面上部を形成する筒体、該筒体で形
成される筒状穴部に配置され且つ前記ヘッドベース部の
上面に接合した同一セラミック材のウイスカー焼成材か
ら成る断熱材、及び該断熱材の燃焼室側の面に接合した
同一セラミック材から成る薄膜から構成した断熱ピスト
ンの構造。(2) A head base part made of a ceramic material that is attached to the piston skirt part and has a sliding surface, a cylindrical body that is integrated with the head base part and forms the upper part of the sliding surface, and a cylindrical shape formed by the cylindrical body. A heat insulating material made of a whisker fired material of the same ceramic material placed in the hole and bonded to the upper surface of the head base part, and a thin film made of the same ceramic material bonded to the combustion chamber side surface of the heat insulating material. Piston structure.
セラミック材から成るヘッドベース部、該ヘッドベース
部と一体構造で摺動面上部を形成する筒体、該筒体で形
成される筒状穴部に配置され且つ前記筒体の内周面に接
合した同一セラミック材のウイスカー焼成材から成る断
熱材、及び該断熱材の燃焼室側の面に接合した同一セラ
ミック材から成る薄膜から構成した断熱ピストンの構造
。(3) A head base part made of a ceramic material that is attached to the piston skirt part and has a sliding surface, a cylindrical body that is integrated with the head base part and forms the upper part of the sliding surface, and a cylindrical shape formed by the cylindrical body. A heat insulating material made of a whisker fired material of the same ceramic material placed in the hole and bonded to the inner peripheral surface of the cylindrical body, and a thin film made of the same ceramic material bonded to the combustion chamber side surface of the heat insulating material. Structure of an insulated piston.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20564789A JPH0668257B2 (en) | 1989-08-10 | 1989-08-10 | Structure of adiabatic piston |
| DE1990603774 DE69003774T2 (en) | 1989-08-10 | 1990-07-12 | Insulated piston. |
| DE1990307647 DE412660T1 (en) | 1989-08-10 | 1990-07-12 | HEAT-INSULATED PISTON. |
| EP19900307647 EP0412660B1 (en) | 1989-08-10 | 1990-07-12 | Heat-insulating piston |
| US07/853,858 US5282411A (en) | 1989-08-10 | 1992-03-19 | Heat-insulating piston with middle section of less dense but same material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20564789A JPH0668257B2 (en) | 1989-08-10 | 1989-08-10 | Structure of adiabatic piston |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0370845A true JPH0370845A (en) | 1991-03-26 |
| JPH0668257B2 JPH0668257B2 (en) | 1994-08-31 |
Family
ID=16510357
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20564789A Expired - Lifetime JPH0668257B2 (en) | 1989-08-10 | 1989-08-10 | Structure of adiabatic piston |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0412660B1 (en) |
| JP (1) | JPH0668257B2 (en) |
| DE (2) | DE69003774T2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4221240C2 (en) * | 1992-06-27 | 2003-01-30 | Mahle Gmbh | Cooled two-part piston |
| DE10306115B4 (en) * | 2003-02-14 | 2005-11-24 | Ks Kolbenschmidt Gmbh | Piston for an internal combustion engine |
| DE102006045729A1 (en) * | 2006-09-27 | 2008-04-03 | Mahle International Gmbh | Internal combustion engine's piston for racing motor, has piston head partially consists of fiber-reinforced connection body provided with two partial bodies, which together form circulating coolant duct and/or annular groove |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE433376B (en) * | 1979-10-22 | 1984-05-21 | Saab Scania Ab | Piston engine with heat insulated combustion chamber |
| JPS59101566A (en) * | 1982-12-03 | 1984-06-12 | Ngk Insulators Ltd | Engine parts |
| DE3873184T2 (en) * | 1987-05-30 | 1993-03-04 | Isuzu Motors Ltd | HEAT-INSULATED COMBUSTION ENGINE ASSEMBLY. |
-
1989
- 1989-08-10 JP JP20564789A patent/JPH0668257B2/en not_active Expired - Lifetime
-
1990
- 1990-07-12 DE DE1990603774 patent/DE69003774T2/en not_active Expired - Fee Related
- 1990-07-12 EP EP19900307647 patent/EP0412660B1/en not_active Expired - Lifetime
- 1990-07-12 DE DE1990307647 patent/DE412660T1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP0412660A1 (en) | 1991-02-13 |
| EP0412660B1 (en) | 1993-10-06 |
| JPH0668257B2 (en) | 1994-08-31 |
| DE412660T1 (en) | 1991-07-25 |
| DE69003774T2 (en) | 1994-03-31 |
| DE69003774D1 (en) | 1993-11-11 |
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