JPH045716Y2 - - Google Patents
Info
- Publication number
- JPH045716Y2 JPH045716Y2 JP1985043154U JP4315485U JPH045716Y2 JP H045716 Y2 JPH045716 Y2 JP H045716Y2 JP 1985043154 U JP1985043154 U JP 1985043154U JP 4315485 U JP4315485 U JP 4315485U JP H045716 Y2 JPH045716 Y2 JP H045716Y2
- Authority
- JP
- Japan
- Prior art keywords
- heat
- piston
- insulating gasket
- piston crown
- thermal conductivity
- 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
Links
- 239000000843 powder Substances 0.000 claims description 17
- 229910052751 metal Inorganic materials 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 15
- 239000000919 ceramic Substances 0.000 claims description 7
- 229910001220 stainless steel Inorganic materials 0.000 description 7
- 239000010935 stainless steel Substances 0.000 description 7
- 230000002093 peripheral effect Effects 0.000 description 6
- 238000003780 insertion Methods 0.000 description 5
- 230000037431 insertion Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 206010010904 Convulsion Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Landscapes
- Gasket Seals (AREA)
Description
【考案の詳細な説明】
［産業上の利用分野］
本考案は熱機関用断熱ガスケツトに関するもの
である。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an insulating gasket for a heat engine.
［従来の技術］
本出願人は特願昭59−123237号により、燃焼ガ
スに哂される部分をセラミツクス壁により構成
し、セラミツクス壁を断熱ガスケツトを間に挾ん
で、普通の金属からなるシリンダヘツドまたはピ
ストン本体にボルトにより結合した熱機関を出願
している。[Prior Art] In Japanese Patent Application No. 59-123237, the present applicant constructed a cylinder head made of ordinary metal by constructing the part exposed to combustion gas by a ceramic wall, and sandwiching a heat insulating gasket between the ceramic walls. Alternatively, the application is for a heat engine that is connected to the piston body by bolts.
上述の熱機関によれば、チタン酸カリウムなど
の熱伝導率の小さい粉末をステンレス鋼板により
包み込んだ断熱ガスケツトを使用することによ
り、ピストン冠部からピストン本体への熱伝導量
を抑えることができる。 According to the above-described heat engine, the amount of heat conducted from the piston crown to the piston body can be suppressed by using an insulating gasket in which a powder with low thermal conductivity, such as potassium titanate, is wrapped in a stainless steel plate.
しかし、ステンレス鋼板は、内包されたチタン
酸カリウムなどの粉末に比べて熱伝導率が高く、
また表面が平坦であることからピストン冠部との
接触面積が広い。このため、機関の高負荷運転で
は十分な断熱効果が得られず、ピストン本体が高
温となり、ピストンリングが焼付くなどの恐れが
ある。 However, stainless steel plates have higher thermal conductivity than the powders such as potassium titanate contained within them.
Furthermore, since the surface is flat, the contact area with the piston crown is wide. For this reason, when the engine is operated under high load, a sufficient insulation effect cannot be obtained, and the piston body becomes hot, which may cause the piston rings to seize.
また、断熱ガスケツトの内部に熱伝導率の小さ
い粉末を均一かつ密実に詰め込むことが難しく、
断熱ガスケツトの内部に空隙があると、長期運転
中に局部的な潰れや亀裂が発生する恐れがある。
さらに、断熱ガスケツトの厚さが組付け後に変化
すると、ピストン冠部とピストン本体との結合部
の平行度が狂い、両者の外周側重合せ面のシール
部材が片当りするなどの悪影響を及ぼす。 In addition, it is difficult to uniformly and densely pack powder with low thermal conductivity inside the insulating gasket.
If there are voids inside the insulating gasket, there is a risk of local collapse or cracking occurring during long-term operation.
Further, if the thickness of the heat insulating gasket changes after assembly, the parallelism of the joint between the piston crown and the piston body will be disrupted, causing adverse effects such as uneven contact between the sealing member on the outer peripheral side of the overlapping surface of the two.
［考案が解決しようとする問題点］
本考案の目的は上述の問題に鑑み、熱伝導率の
小さい粉末を内包した断熱ガスケツトの、ピスト
ン冠部との接触面積を減じることにより、ピスト
ン冠部からピストン本体への伝熱を抑えるように
した、熱機関用断熱ガスケツトを提供することに
ある。[Problems to be solved by the invention] In view of the above-mentioned problems, the purpose of the invention is to reduce the contact area between the piston crown and the insulating gasket, which contains powder with low thermal conductivity, so as to reduce the contact area from the piston crown. To provide a heat insulating gasket for a heat engine which suppresses heat transfer to a piston body.
［問題点を解決するための手段］
上記目的を達成するために、本考案の構成はピ
ストン本体の上面とセラミツクスからなるピスト
ン冠部の下面に挟持される断熱ガスケツトが、耐
熱性金属板からなる偏平な袋体の内部に熱伝導率
の小さい粉末を充填し、かつ袋体の表面にピスト
ン冠部の下面と接触しない多数のくぼみを備えた
ものである。[Means for Solving the Problems] In order to achieve the above object, the structure of the present invention is such that the insulating gasket, which is sandwiched between the upper surface of the piston body and the lower surface of the piston crown made of ceramics, is made of a heat-resistant metal plate. The inside of a flat bag is filled with powder having low thermal conductivity, and the bag has a large number of depressions on its surface that do not come into contact with the lower surface of the piston crown.
［作用］
熱伝導率の小さい粉末としてのチタン酸カリウ
ムは、熱伝導率が0.000125kcal／mh℃であり、
耐熱金属としてのステンレスの熱伝導率
（039kcal／mh℃）よりも非常に小さい。熱伝導
率の小さい粉末を内包する袋体は、ステンレス鋼
板からなり、上下両面に多数のくぼみが成形され
ているので、ピストン冠部とピストン本体に対す
る接触面積が減じられる。換言すれば、くぼみの
内部に断熱空部が形成されるので、ピストン冠部
からピストン本体への伝熱量が減じられる。[Action] Potassium titanate as a powder with low thermal conductivity has a thermal conductivity of 0.000125kcal/mh℃,
Thermal conductivity is much lower than that of stainless steel (039kcal/mh℃), which is a heat-resistant metal. The bag containing the powder with low thermal conductivity is made of a stainless steel plate, and has a large number of depressions formed on both the upper and lower surfaces, thereby reducing the contact area between the piston crown and the piston body. In other words, since a heat insulating cavity is formed inside the recess, the amount of heat transferred from the piston crown to the piston body is reduced.
［考案の実施例］
第３図に示すように、本考案が適用される断熱
ピストンは、ピストン本体７と、ピストン冠部４
と、両者を結合するボルト１７とナツト１２から
構成される。[Embodiment of the invention] As shown in FIG.
It is composed of a bolt 17 and a nut 12 that connect the two.
ピストン本体７の上端側外周面にリング溝１４
が設けられる。ピストン本体７の下半部は公知の
スカートを一体に形成される。スカートの内側に
図示してないピストンピンを支持するピン穴１０
を有する肉厚のボス部が一体に形成される。ピス
トン本体７の上面７ａの周縁部には、上方へ突出
する浅い円筒部ないし突条３２が設けられる。ま
た、ピストン本体７の上面７ａの中央部に、上方
へ突出する柱１５が形成され、柱１５にボルト挿
通穴１９が形成される。 A ring groove 14 is formed on the outer peripheral surface of the upper end of the piston body 7.
will be provided. The lower half of the piston body 7 is integrally formed with a known skirt. A pin hole 10 for supporting a piston pin (not shown) inside the skirt
A thick boss portion having a thickness is integrally formed. A shallow cylindrical portion or protrusion 32 that protrudes upward is provided on the peripheral edge of the upper surface 7a of the piston body 7. Further, a column 15 that projects upward is formed at the center of the upper surface 7a of the piston body 7, and a bolt insertion hole 19 is formed in the column 15.
セラミツクスから形成されるピストン冠部４
は、下面４ａの周縁部に段部３１を形成され、前
述したピストン本体７の突条３２の内部へ嵌合し
て位置決めされる。ピストン冠部４の上面中央部
に、燃焼室を形成するくぼみ３が設けられ、全体
の肉厚を均等なものとするために、ピストン冠部
４の下面４ａの中央部に円筒部５が設けられる。 Piston crown 4 made of ceramics
A stepped portion 31 is formed on the peripheral edge of the lower surface 4a, and is positioned by fitting into the inside of the protrusion 32 of the piston body 7 described above. A recess 3 forming a combustion chamber is provided in the center of the upper surface of the piston crown 4, and a cylindrical portion 5 is provided in the center of the lower surface 4a of the piston crown 4 in order to make the entire wall thickness uniform. It will be done.
くぼみ３と円筒部５で区画される水平な壁部に
ボルト挿通穴２３が設けられる。ボルト１７はピ
ストン冠部４のボルト挿通穴２３、断熱ガスケツ
ト３４のボルト挿通穴３３、ピストン本体７のボ
ルト挿通穴１９に挿通され、皿ばね１３を当てた
うえナツト１２を螺合される。ナツト１２を締め
付けることにより、ピストン本体７の柱１５の上
端壁に、ピストン冠部４のくぼみ５の内面が密接
される。ピストン冠部４の下面４ａとピストン本
体７の上面７ａとの間に断熱ガスケツト３４が介
装され、断熱ガスケツト３４により円筒部５の内
部、すなわち断熱空部２が密封される。 A bolt insertion hole 23 is provided in a horizontal wall portion defined by the recess 3 and the cylindrical portion 5. The bolt 17 is inserted into the bolt insertion hole 23 of the piston crown 4, the bolt insertion hole 33 of the heat insulating gasket 34, and the bolt insertion hole 19 of the piston body 7, and after applying the disk spring 13, the nut 12 is screwed. By tightening the nut 12, the inner surface of the recess 5 of the piston crown 4 is brought into close contact with the upper end wall of the column 15 of the piston body 7. A heat insulating gasket 34 is interposed between the lower surface 4a of the piston crown 4 and the upper surface 7a of the piston body 7, and the inside of the cylindrical portion 5, that is, the heat insulating cavity 2 is sealed by the heat insulating gasket 34.
第１，２図に示すように、本考案によれば、ス
テンレスなどの円形の耐熱性金属板３６，３７に
より袋体が構成され、袋体の内部にチタン酸カリ
ウムなどの熱伝導率の小さい粉末２７が充填され
る。具体的には、袋体は平坦な円形のステンレス
などの耐熱性金属板３６の周縁部３６ａを円弧状
に縁曲げして、耐熱性金属板３７の周縁部に重ね
合せて形成される。ボルト１７を挿通する穴３３
は、耐熱性金属板３６から筒体を押し出し、筒体
の縁部３６ｂを耐熱性金属板３７の外面に重ね合
せて形成される。実際には、袋体を形成する前
に、予め耐熱性金属板３６と耐熱性金属板３７と
の間に熱伝導率の小さい粉末２７を充填し、縁部
３６ａを折り返して耐熱性金属板３７の上に重ね
合せ、所定の寸法に圧搾して仕上げる。最後に、
プレスにより耐熱性金属板３６，３７の表面に多
数のくぼみ３５を形成してガスケツト３４を得
る。 As shown in FIGS. 1 and 2, according to the present invention, the bag body is composed of circular heat-resistant metal plates 36 and 37 made of stainless steel, etc. Powder 27 is filled. Specifically, the bag body is formed by bending the peripheral edge 36a of a flat circular heat-resistant metal plate 36 such as stainless steel into an arc shape and overlapping the peripheral edge of the heat-resistant metal plate 37. Hole 33 for inserting bolt 17
is formed by extruding a cylinder from the heat-resistant metal plate 36 and overlapping the edge 36b of the cylinder on the outer surface of the heat-resistant metal plate 37. Actually, before forming the bag, powder 27 with low thermal conductivity is filled between the heat-resistant metal plates 36 and 37, and the edges 36a are folded back to form the heat-resistant metal plates 37. Lay them on top of each other and press them to the desired size to finish. lastly,
A large number of depressions 35 are formed on the surfaces of the heat-resistant metal plates 36 and 37 by pressing to obtain a gasket 34.
本考案は上述のように、断熱ガスケツト３４と
して、耐熱性金属板からなる袋体の内部に熱伝導
率の小さい粉末２７を充填し、袋体の平坦な表面
に多数のくぼみ３５を形成したから、ピストン本
体７とピストン冠部４に対する断熱ガスケツト３
４の接触面積が狭く、ピストン冠部４と断熱ガス
ケツト３４のくぼみ３５との間に断熱空部が形成
され、同様にピストン本体７と断熱ガスケツト３
４のくぼみ３５との間にも断熱空部が形成される
ので、ピストン冠部４からピストン本体７への伝
熱量が抑えられる。 As described above, in the present invention, as the insulating gasket 34, the inside of the bag made of a heat-resistant metal plate is filled with powder 27 having low thermal conductivity, and a large number of depressions 35 are formed on the flat surface of the bag. , a heat insulating gasket 3 for the piston body 7 and the piston crown 4
4 has a narrow contact area, and a heat insulating cavity is formed between the piston crown 4 and the recess 35 of the heat insulating gasket 34, and similarly the piston body 7 and the heat insulating gasket 3
Since a heat insulating cavity is also formed between the piston crown portion 4 and the recess 35, the amount of heat transferred from the piston crown portion 4 to the piston body 7 is suppressed.
したがつて、機関の燃焼室の温度が高く保たれ
るので、熱サイクルの効率が向上し、同時にピス
トン本体７の熱負荷が軽くなるので、ピストンリ
ングの焼付きなどの恐れがなくなる。 Therefore, the temperature of the combustion chamber of the engine is kept high, improving the efficiency of the heat cycle, and at the same time, the heat load on the piston body 7 is reduced, eliminating the risk of seizure of the piston rings.
袋体に熱伝導率の小さい粉末２７を充填し所定
の厚さに成形した後に、袋体の表面にプレスによ
り多数のくぼみ３５を形成すれば、熱伝導率の小
さい粉末２７が袋体の内部に緊密かつ密実に充填
されることになり、長期使用に伴つて断熱ガスケ
ツトが空隙を生じるとか変形するなどの問題がな
い。 After filling the bag with the powder 27 with low thermal conductivity and molding it to a predetermined thickness, if a large number of depressions 35 are formed on the surface of the bag by pressing, the powder 27 with low thermal conductivity will flow into the inside of the bag. This means that the gasket is tightly and densely filled, and there is no problem such as the insulating gasket forming voids or deforming during long-term use.
なお、上述の実施例において、袋体のステンレ
ス鋼板の表面に、コージライト、ジルコニアなど
のセラミツクスをコーテイングすれば、断熱性が
さらに向上する。 In the above-described embodiment, if the surface of the stainless steel plate of the bag body is coated with ceramics such as cordierite or zirconia, the heat insulation properties can be further improved.
［考案の効果］
本考案は上述のように、ピストン本体の上面と
セラミツクスからなるピストン冠部の下面に挟持
される断熱ガスケツトが、耐熱性金属板からなる
偏平な袋体の内部に熱伝導率の小さい粉末を充填
し、かつ袋体の表面にピストン冠部の下面と接触
しない多数のくぼみを備えたものであり、熱伝導
率の小さい粉末を内包した袋体の表面に多数のく
ぼみを備えたので、従来例に比べてピストン冠部
に対する断熱ガスケツトの接触面積が減じられ、
またくぼみによりピストン冠部との間に断熱空部
が形成される結果、ピストン冠部からピストン本
体への伝熱量が大幅に減じられる。[Effects of the invention] As described above, the present invention has a heat insulating gasket sandwiched between the upper surface of the piston body and the lower surface of the piston crown made of ceramics, which has a high thermal conductivity inside the flat bag made of a heat-resistant metal plate. The bag is filled with powder with a small thermal conductivity, and has a large number of depressions on the surface of the bag that do not come into contact with the lower surface of the piston crown. Therefore, the contact area of the heat insulating gasket with the piston crown is reduced compared to the conventional example.
Further, as a result of forming a heat insulating cavity between the piston crown and the piston crown, the amount of heat transferred from the piston crown to the piston body is significantly reduced.
したがつて、機関の高負荷運転でも断熱ガスケ
ツトの断熱効果によりピストン本体の温度上昇が
抑えられるので、ピストン本体に装着されるピス
トンリングのステイツクや焼き付きを防止でき
る。 Therefore, even when the engine is operated under high load, the heat insulating effect of the heat insulating gasket suppresses the rise in temperature of the piston body, thereby preventing the piston rings attached to the piston body from becoming stuck or seizing.
熱伝導率の小さい粉末を内包した状態で袋体の
表面にくぼみをプレス成形すれば、熱伝導率の小
さい粉末が袋体に密実に充填され、長期使用に対
して形状変化が生じない。 If a recess is press-molded on the surface of the bag with the powder having low thermal conductivity encapsulated, the powder with low thermal conductivity will be densely filled into the bag, and the bag will not change shape even after long-term use.
第１図は本考案に係る熱機関用断熱ガスケツト
の正面断面図、第２図は同平面図、第３図は同断
熱ガスケツトが装着された断熱ピストンの正面断
面図である。
２……断熱空部、４……ピストン冠部、７……
ピストン本体、１７……ボルト、２７……熱伝導
率の小さい粉末、３４……断熱ガスケツト、３
６，３７……耐熱性金属板。
FIG. 1 is a front cross-sectional view of a heat-insulating gasket for a heat engine according to the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a front cross-sectional view of a heat-insulating piston to which the heat-insulating gasket is installed. 2...Insulating cavity, 4...Piston crown, 7...
Piston body, 17... Bolt, 27... Powder with low thermal conductivity, 34... Insulating gasket, 3
6,37...Heat-resistant metal plate.
Claims (1)
ストン冠部の下面に挟持される断熱ガスケツト
が、耐熱性金属板からなる偏平な袋体の内部に熱
伝導率の小さい粉末を充填し、かつ袋体の表面に
ピストン冠部の下面と接触しない多数のくぼみを
備えてなることを特徴とする、熱機関用断熱ガス
ケツト。 An insulating gasket sandwiched between the upper surface of the piston body and the lower surface of the piston crown made of ceramics fills a flat bag made of a heat-resistant metal plate with powder with low thermal conductivity, and A heat insulating gasket for a heat engine, characterized by comprising a number of recesses that do not come into contact with the lower surface of a piston crown.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985043154U JPH045716Y2 (en) | 1985-03-27 | 1985-03-27 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985043154U JPH045716Y2 (en) | 1985-03-27 | 1985-03-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61159646U JPS61159646U (en) | 1986-10-03 |
| JPH045716Y2 true JPH045716Y2 (en) | 1992-02-18 |
Family
ID=30554560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985043154U Expired JPH045716Y2 (en) | 1985-03-27 | 1985-03-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH045716Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5637419A (en) * | 1979-08-31 | 1981-04-11 | Daido Steel Co Ltd | Controlling method of operation of burner in combustion furnace |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5555662U (en) * | 1978-10-07 | 1980-04-15 |
-
1985
- 1985-03-27 JP JP1985043154U patent/JPH045716Y2/ja not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5637419A (en) * | 1979-08-31 | 1981-04-11 | Daido Steel Co Ltd | Controlling method of operation of burner in combustion furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61159646U (en) | 1986-10-03 |
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| JPH045716Y2 (en) | ||
| JPH0435563Y2 (en) | ||
| JPH0424125Y2 (en) | ||
| JPH0433397Y2 (en) | ||
| JP2560422B2 (en) | Structure of adiabatic piston | |
| JPH0355664B2 (en) | ||
| JPH0424124Y2 (en) | ||
| JPH0427429B2 (en) | ||
| JPS6166848A (en) | Heat-insulating piston | |
| JPS6375665U (en) | ||
| JPH0350103B2 (en) | ||
| JPH0222130Y2 (en) | ||
| JPS643798Y2 (en) | ||
| JPH0115880Y2 (en) | ||
| JPS61159643U (en) | ||
| JPH0745851B2 (en) | Structure of adiabatic piston | |
| JPH0128268Y2 (en) | ||
| JPH0117636Y2 (en) | ||
| JPH0310027U (en) | ||
| JPH0437240Y2 (en) | ||
| JPH045691Y2 (en) | ||
| JPH0350277Y2 (en) | ||
| JPS58210316A (en) | Combustion chamber for internal combustion engine | |
| JPH0151666B2 (en) |