JP2923584B2 - Heat shield engine - Google Patents
Heat shield engineInfo
- Publication number
- JP2923584B2 JP2923584B2 JP3347962A JP34796291A JP2923584B2 JP 2923584 B2 JP2923584 B2 JP 2923584B2 JP 3347962 A JP3347962 A JP 3347962A JP 34796291 A JP34796291 A JP 34796291A JP 2923584 B2 JP2923584 B2 JP 2923584B2
- Authority
- JP
- Japan
- Prior art keywords
- combustion chamber
- sub
- heat shield
- wall
- intake
- 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
Links
- 238000002485 combustion reaction Methods 0.000 claims description 49
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 239000000919 ceramic Substances 0.000 claims description 8
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 7
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 7
- 239000011810 insulating material Substances 0.000 claims description 6
- 229910000505 Al2TiO5 Inorganic materials 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- AABBHSMFGKYLKE-SNAWJCMRSA-N propan-2-yl (e)-but-2-enoate Chemical compound C\C=C\C(=O)OC(C)C AABBHSMFGKYLKE-SNAWJCMRSA-N 0.000 claims description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 2
- 239000000446 fuel Substances 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000013585 weight reducing agent Substances 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
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
- F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は遮熱構造からなるシリン
ダヘッドを有する遮熱エンジンに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat shield engine having a cylinder head having a heat shield structure.
【０００２】[0002]
【従来の技術】燃料の燃焼エネルギーを動力源とするエ
ンジンでは、そのエネルギーの相当量がエンジン部分に
吸収され、熱膨張による燃焼室関連部分の変形や、燃料
の異常爆発、潤滑不良などの不都合が生じるため、空気
や水などを媒体とした冷却装置が用いられており、この
冷却によりエンジンの熱効率が損なわれている。2. Description of the Related Art In an engine that uses combustion energy of fuel as a power source, a considerable amount of the energy is absorbed by the engine, causing inconveniences such as deformation of a combustion chamber-related portion due to thermal expansion, abnormal explosion of fuel, and poor lubrication. Therefore, a cooling device using air, water, or the like as a medium is used, and this cooling impairs the thermal efficiency of the engine.
【０００３】近年、エンジンの燃焼室の関連部分に例え
ばセラミックスを用いて高温度に耐えるとともに断熱性
を保たせた断熱エンジンが開発され、従来は不可欠であ
った冷却装置を用いることなく熱効率の向上や重量の軽
減が図られている。[0003] In recent years, heat insulating engines have been developed which use ceramics to withstand high temperatures and maintain heat insulation properties, for example, in the relevant parts of the combustion chamber of the engine, thereby improving thermal efficiency without using a cooling device which has been indispensable in the past. And weight reduction.
【０００４】[0004]
【発明が解決しようとする課題】この種のエンジンでは
その断熱化が進むと、燃焼室などは遮熱構造を要すると
ともに、副燃焼式のエンジンでは燃焼効率の向上を図る
ため、副燃焼室の位置を主燃焼室の中央上部に配置する
必要があり、このため、副燃焼室自身や吸、排気通路な
どのスペースが小さくなり、またその構造が複雑になる
という問題がある。As the heat insulation of this type of engine progresses, the combustion chamber and the like require a heat shielding structure, and the auxiliary combustion type engine requires a combustion chamber to improve the combustion efficiency. It is necessary to arrange the position in the upper central part of the main combustion chamber, so that the space for the sub-combustion chamber itself, the intake and exhaust passages, etc. is reduced, and the structure is complicated.
【０００５】本発明はこのような問題に鑑みてなされた
ものであり、その目的は遮熱エンジンにおける高温ガス
に触れる部分を一構造として上述の点を改善しようとす
る遮熱エンジンを提供することにある。The present invention has been made in view of such a problem, and an object of the present invention is to provide a heat-shielding engine which improves the above-mentioned point by forming a portion of the heat-shielding engine which is in contact with high-temperature gas as one structure. It is in.
【０００６】[0006]
【課題を解決するための手段】上述の目的を達成するた
めに、本願の請求項１に係る発明では、内周面をピスト
ンが摺動するシリンダの上部に断熱材により形成された
シリンダヘッドを備えた遮熱エンジンにおいて、上記シ
リンダの上端と接する外周壁の内周に設けられ、少なく
とも上昇したピストンの上面とで形成する主燃焼室と、
該主燃焼室の壁部を形成する下壁の中央上部に配置さ
れ、該主燃焼室と連通する気孔を有する副燃焼室と、該
副燃焼室の周囲に配置され、副燃焼室とは側壁を隔てて
隣接するとともに、吸気弁により開閉され主燃焼室に連
通する吸気口を備えた吸気通路と、該副燃焼室の周囲に
配置され、副燃焼室とは側壁を隔てて隣接するととも
に、排気弁により開閉され主燃焼室に連通する排気口を
備えた排気通路と、からなり、各部がほぼ均一の肉厚を
有するシリンダヘッドを有し、これらが断熱素材により
一体に形成されていることを特徴とする遮熱エンジンを
提供する。本願の請求項２に係る発明では、請求項１に
係る発明に加えて、前記のシリンダヘッドは窒化珪素と
酸化チタン又はチタン酸アルミニウムからなる複合セラ
ミックスからなる断熱素材により形成されていることを
特徴とする遮熱エンジンを提供する。本願の請求項３に
係る発明では、請求項１又は２に係る発明に加えて、前
記のシリンダヘッドは窒化珪素からなる外壁により覆わ
れていることを特徴とする遮熱エンジンを提供する。In order to achieve the above-mentioned object, according to the first aspect of the present invention, a cylinder head formed of a heat insulating material is provided on an upper part of a cylinder on which a piston slides on an inner peripheral surface. A main combustion chamber provided on the inner periphery of the outer peripheral wall in contact with the upper end of the cylinder, and formed at least with the upper surface of the raised piston;
A sub-combustion chamber disposed at the upper center of a lower wall forming a wall of the main combustion chamber and having pores communicating with the main combustion chamber; and a sub-combustion chamber disposed around the sub-combustion chamber. And an intake passage provided with an intake port that is opened and closed by an intake valve and communicates with the main combustion chamber, and is disposed around the auxiliary combustion chamber, and the auxiliary combustion chamber is adjacent to the auxiliary combustion chamber via a side wall, An exhaust passage having an exhaust port which is opened and closed by an exhaust valve and communicates with the main combustion chamber, wherein each part has a cylinder head having a substantially uniform thickness, and these are integrally formed of a heat insulating material. The present invention provides a heat shield engine characterized by the following. The invention according to claim 2 of the present application is characterized in that, in addition to the invention according to claim 1, the cylinder head is formed of a heat insulating material made of a composite ceramic made of silicon nitride and titanium oxide or aluminum titanate. A heat shield engine is provided. According to a third aspect of the present invention, in addition to the first or second aspect, a heat shield engine is provided, wherein the cylinder head is covered with an outer wall made of silicon nitride.
【０００７】[0007]
【作用】副燃焼室を中央部分に配置し、低熱伝導材のセ
ラミックスからなる側壁を隔てて吸気通路および排気通
路にて囲み、これら通路の外周壁により一体構造に構成
したので、該副燃焼室を中央に配設出来ると共に燃焼に
よる高熱ガスに接触する部分が遮熱化されるので一体成
型されたシリンダヘッド内で燃焼系、吸気系、排気系が
共存出来、それぞれに広いスペースが得られるととも
に、構造の複雑さが避けられる。The sub-combustion chamber is arranged at the center, is surrounded by the intake passage and the exhaust passage with the side wall made of ceramics of a low thermal conductive material interposed therebetween, and is constituted integrally by the outer peripheral walls of these passages. Can be arranged in the center and the part that contacts the hot gas by combustion is shielded, so the combustion system, intake system, and exhaust system can coexist in the integrally molded cylinder head, and a wide space can be obtained for each. , The complexity of the structure is avoided.
【０００８】[0008]
【実施例】つぎに本発明の一実施例について図面を用い
て詳細に説明する。Next, an embodiment of the present invention will be described in detail with reference to the drawings.
【０００９】図１の（Ａ）は本発明にかかる遮熱エンジ
ンのシリンダヘッドの一実施例を示す横断面図、図１の
（Ｂ）はその縦断面図である。FIG. 1A is a transverse sectional view showing an embodiment of a cylinder head of a heat shield engine according to the present invention, and FIG. 1B is a longitudinal sectional view thereof.
【００１０】これらの図面において、２はシリンダ、３
はピストンで、本発明の実施例におけるシリンダヘッド
１は吸気通路１２、排気通路１３が一体に形成されてシ
リンダ２の上部に装着されており、吸気弁４および排気
弁５が配置される。In these drawings, reference numeral 2 denotes a cylinder, 3
The cylinder head 1 in the embodiment of the present invention has an intake passage 12 and an exhaust passage 13 integrally formed and mounted on the upper part of the cylinder 2, and an intake valve 4 and an exhaust valve 5 are arranged.
【００１１】そして、シリンダヘッド１の中央部分には
副燃焼室１１が配置され、外周壁１５に近い部分には弧
状の吸気通路１２および排気通路１３が設けられ、これ
らの吸気通路１２、排気通路１３や、副燃焼室１１の側
壁１４、外周壁１５などは断熱性が良好で低熱伝導性を
有する窒化珪素（Ｓｉ３Ｎ４）と酸化チタン（ＴｉＯ）
又はチタン酸アルミニウム（Ａｌ２ＴｉＯ５）からなる
複合セラミックスが使用されて、成型性や鋳造性をよく
するために均一の肉厚となるように形成されている。A sub-combustion chamber 11 is arranged at the center of the cylinder head 1 and arcuate intake passages 12 and exhaust passages 13 are provided at a portion near the outer peripheral wall 15. 13 and the side walls 14 and the outer peripheral wall 15 of the sub-combustion chamber 11 have good heat insulating properties and low thermal conductivity such as silicon nitride (Si3N4) and titanium oxide (TiO).
Alternatively, a composite ceramic made of aluminum titanate (Al2TiO5) is used, and is formed to have a uniform thickness in order to improve moldability and castability.
【００１２】また、副燃焼室１１の上壁には燃料噴射ノ
ズルＮが装着される噴射ノズル孔１１１、下壁にはピス
トン３の上方に形成される主燃焼室３１に連通する気孔
１１２が貫設されており、シリンダヘッド１の外周部に
嵌合される外壁１６には高強度を有する窒化珪素（Ｓｉ
３Ｎ４）からなるセラミックスが用いられている。The upper wall of the sub-combustion chamber 11 has an injection nozzle hole 111 in which the fuel injection nozzle N is mounted. The lower wall has an air hole 112 communicating with the main combustion chamber 31 formed above the piston 3. The outer wall 16 fitted to the outer peripheral portion of the cylinder head 1 has high strength silicon nitride (Si).
3N4) is used.
【００１３】４１は吸気口で、吸気弁４が取付けられて
その開弁時には吸気通路１２とシリンダ内部とを連通し
て新気を導くもので、開口面積を大にするため例えば２
個の吸気口４１，４１が貫設されている。Reference numeral 41 denotes an intake port, to which the intake valve 4 is attached, which communicates the intake passage 12 with the inside of the cylinder when the valve is opened to guide fresh air.
The individual intake ports 41, 41 are provided through.
【００１４】５１は排気口であり、排気弁５が取付けら
れその開弁時には燃焼後の排気ガスを排気通路１３を介
して外部に排出するもので、吸気口４１と同様に２個設
けられている。Reference numeral 51 denotes an exhaust port, to which the exhaust valve 5 is attached, and when the valve is opened, exhaust gas after combustion is discharged to the outside through the exhaust passage 13. Two exhaust ports are provided similarly to the intake port 41. I have.
【００１５】なお、上述のような吸気通路１２、排気通
路１３と主燃焼室３１、副燃焼室１１とを備えたシリン
ダヘッド１はセラミックスのみにて一体に形成され、金
属を用いずに構成されている。The cylinder head 1 including the intake passage 12, the exhaust passage 13, the main combustion chamber 31, and the sub-combustion chamber 11 as described above is integrally formed of only ceramics, and is constructed without using metal. ing.
【００１６】つぎに、このように構成された本発明に係
る実施例の作動を説明すると、上述のように燃料の燃焼
が行われる副燃焼室１１や高温度の排気通路１３と吸気
通路１２とは低熱伝導材のセラミックの側壁１４などで
隔てられているため、一体構造によって近接していても
燃焼熱による高温は遮られ、悪影響を受けることなく通
常の吸気、爆発、排気などのエンジンの作動過程が行わ
れることになり、また、吸気通路１２や排気通路１３が
コンパクト化されるとともに、吸気口４１、排気口５１
をそれぞれ複数個設けたことにより効率よく吸排気が行
われ、力強くピストン３が駆動されてエンジントルクが
発生することになる。Next, the operation of the embodiment according to the present invention will be described. The sub-combustion chamber 11 in which fuel is burned as described above, and the high temperature exhaust passage 13 and the intake passage 12 Are separated by ceramic side walls 14 made of low thermal conductive material, so even if they are close to each other, high temperature due to combustion heat is blocked even if they are close to each other, and normal engine operation such as intake, explosion, exhaust, etc. is not affected. The process is performed, and the intake passage 12 and the exhaust passage 13 are made compact.
Are provided, the intake and exhaust are efficiently performed, the piston 3 is strongly driven, and engine torque is generated.
【００１７】以上、本発明を上述の実施例によって説明
したが、本発明の主旨の範囲内で例えば吸気口や排気口
をそれぞれ２個以上設けるように、種々の変形が可能で
あり、これらの変形を本発明の範囲から排除するもので
はない。Although the present invention has been described with reference to the above-described embodiment, various modifications are possible within the scope of the present invention, for example, providing at least two intake ports and two or more exhaust ports. Modifications are not excluded from the scope of the invention.
【００１８】[0018]
【発明の効果】上述の実施例のように本発明によれば、
中心部分に副燃焼室を配置して吸、排気通路を近接さ
せ、耐熱性のある低熱伝導素材のセラミックスを側壁と
して一体化して形成し、シリンダの頂部に装着させて遮
熱エンジンとしたので、副燃焼室や吸、排気通路として
広いスペースが得られるとともに、副燃焼室などの構造
の複雑化が避けられるという効果が得られる。According to the present invention as in the above embodiment,
A sub-combustion chamber is located at the center, the intake and exhaust passages are close to each other, and a ceramic made of heat-resistant low heat conductive material is integrally formed as a side wall. A large space can be obtained as the sub-combustion chamber, the intake and exhaust passages, and the effect of avoiding complication of the structure of the sub-combustion chamber and the like can be obtained.
【００１９】また本発明では、シリンダヘッドの中央に
副燃焼室を配置し、その周囲に吸気通路と排気通路とを
配置したので、上記のごとく吸気口および排気口の形成
領域を広く形成することが出来、そのため吸気や排気流
路の抵抗が減じ、効率のよいエンジンとなる利点が生ず
る。In the present invention, since the sub-combustion chamber is arranged at the center of the cylinder head and the intake passage and the exhaust passage are arranged around the sub-combustion chamber, the area for forming the intake port and the exhaust port is widened as described above. Therefore, there is an advantage that the resistance of the intake and exhaust passages is reduced and an efficient engine is obtained.
【００２０】なお、シリンダヘッドの各部はほぼ均一な
厚みを有しているため、成型性や鋳込み性が良く、この
ため、生産コストの低減が図れる効果がある。Since each part of the cylinder head has a substantially uniform thickness, it has good moldability and castability, and thus has the effect of reducing production costs.
【図１】本発明にかかる遮熱エンジンの燃焼室の一実施
例を示す横断面図と縦断面図である。FIG. 1 is a transverse sectional view and a longitudinal sectional view showing one embodiment of a combustion chamber of a heat shield engine according to the present invention.
１…シリンダヘッド ２…シリンダ ３…ピストン ４…吸気弁 ５…排気弁 １１…副燃焼室 １２…吸気通路 １３…排気通路 １４…側壁 １５…外周壁 １６…外壁 ３１…主燃焼室 ４１…吸気口 ５１…排気口 １１２…気孔 DESCRIPTION OF SYMBOLS 1 ... Cylinder head 2 ... Cylinder 3 ... Piston 4 ... Intake valve 5 ... Exhaust valve 11 ... Subcombustion chamber 12 ... Intake passage 13 ... Exhaust passage 14 ... Side wall 15 ... Outer peripheral wall 16 ... Outer wall 31 ... Main combustion chamber 41 ... Inlet 51: exhaust port 112: pore
フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｆ０２Ｆ 1/42 Ｆ０２Ｆ 1/42 Ｎ Continued on the front page (51) Int.Cl. 6 Identification code FI F02F 1/42 F02F 1/42 N
Claims (3)
部に断熱材により形成されたシリンダヘッドを備えた遮
熱エンジンにおいて、 上記シリンダの上端と接する外周壁の内周に設けられ、
少なくとも上昇したピストンの上面とで形成する主燃焼
室と、 該主燃焼室の壁部を形成する下壁の中央上部に配置さ
れ、該主燃焼室と連通する気孔を有する副燃焼室と、 該副燃焼室の周囲に配置され、副燃焼室とは側壁を隔て
て隣接するとともに、吸気弁により開閉され主燃焼室に
連通する吸気口を備えた吸気通路と、 該副燃焼室の周囲に配置され、副燃焼室とは側壁を隔て
て隣接するとともに、排気弁により開閉され主燃焼室に
連通する排気口を備えた排気通路と、 からなり、各部がほぼ均一の肉厚を有するシリンダヘッ
ドを有し、これらが断熱素材により一体に形成されてい
ることを特徴とする遮熱エンジン。1. A heat shield engine having a cylinder head formed of a heat insulating material on an upper part of a cylinder on which a piston slides on an inner peripheral surface, wherein the heat shield engine is provided on an inner periphery of an outer peripheral wall in contact with an upper end of the cylinder.
A main combustion chamber formed at least with the upper surface of the raised piston, a sub-combustion chamber disposed at the upper center of a lower wall forming a wall of the main combustion chamber, and having a pore communicating with the main combustion chamber; An intake passage arranged around the sub-combustion chamber, adjacent to the sub-combustion chamber via a side wall, and provided with an intake port opened and closed by an intake valve and communicating with the main combustion chamber; and arranged around the sub-combustion chamber. An exhaust passage having an exhaust port which is adjacent to the sub-combustion chamber via a side wall and is opened / closed by an exhaust valve and communicates with the main combustion chamber, wherein each section has a substantially uniform wall thickness. A heat shield engine, comprising: a heat insulating material;
タン又はチタン酸アルミニウムからなる複合セラミック
スからなる断熱素材により形成されていることを特徴と
する請求項１記載の遮熱エンジン。2. The heat shield engine according to claim 1, wherein said cylinder head is formed of a heat insulating material made of a composite ceramic made of silicon nitride and titanium oxide or aluminum titanate.
外壁により覆われていることを特徴とする請求項１また
は請求項２記載の遮熱エンジン。3. The heat shield engine according to claim 1, wherein said cylinder head is covered with an outer wall made of silicon nitride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3347962A JP2923584B2 (en) | 1991-12-03 | 1991-12-03 | Heat shield engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3347962A JP2923584B2 (en) | 1991-12-03 | 1991-12-03 | Heat shield engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05157002A JPH05157002A (en) | 1993-06-22 |
| JP2923584B2 true JP2923584B2 (en) | 1999-07-26 |
Family
ID=18393796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3347962A Expired - Lifetime JP2923584B2 (en) | 1991-12-03 | 1991-12-03 | Heat shield engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2923584B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AUPP558398A0 (en) * | 1998-09-01 | 1998-09-24 | Galbraith Engineering Pty Ltd | Improved reciprocatory machine |
| JP2015117581A (en) * | 2013-12-16 | 2015-06-25 | 三菱重工業株式会社 | Gas engine |
| AT523918B1 (en) * | 2020-08-10 | 2022-01-15 | Avl List Gmbh | CYLINDER HEAD |
-
1991
- 1991-12-03 JP JP3347962A patent/JP2923584B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05157002A (en) | 1993-06-22 |
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