JPS6353922B2 - - Google Patents
Info
- Publication number
- JPS6353922B2 JPS6353922B2 JP58177388A JP17738883A JPS6353922B2 JP S6353922 B2 JPS6353922 B2 JP S6353922B2 JP 58177388 A JP58177388 A JP 58177388A JP 17738883 A JP17738883 A JP 17738883A JP S6353922 B2 JPS6353922 B2 JP S6353922B2
- Authority
- JP
- Japan
- Prior art keywords
- combustion chamber
- powder
- internal combustion
- combustion engine
- powder compact
- 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
- 238000002485 combustion reaction Methods 0.000 claims description 54
- 239000000843 powder Substances 0.000 claims description 43
- 238000004519 manufacturing process Methods 0.000 claims description 16
- 238000003754 machining Methods 0.000 claims description 12
- 239000000919 ceramic Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 8
- 238000012805 post-processing Methods 0.000 claims description 5
- 238000000748 compression moulding Methods 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 description 12
- 238000005238 degreasing Methods 0.000 description 7
- 239000012188 paraffin wax Substances 0.000 description 5
- 238000000465 moulding Methods 0.000 description 4
- 239000004793 Polystyrene Substances 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 229920002223 polystyrene Polymers 0.000 description 3
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000011224 oxide ceramic Substances 0.000 description 1
- 229910052574 oxide ceramic Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000007582 slurry-cast process Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は内燃機関用副燃焼室及びその製造方法
に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an auxiliary combustion chamber for an internal combustion engine and a method for manufacturing the same.
自動車用デイーゼルエンジンにおいては、ピス
トンクラウンの他に副燃焼室を設け、この副燃焼
室内に空気の渦流を生ぜしめるとともに、この渦
流中に燃料を噴射して、その大部分を燃焼させる
渦流室式と呼ばれる燃焼方式のものがある。
In automobile diesel engines, a vortex chamber type is used in which an auxiliary combustion chamber is provided in addition to the piston crown, and a vortex of air is created in this auxiliary combustion chamber, and fuel is injected into this vortex and most of it is combusted. There is a combustion method called .
この方式のデイーゼルエンジンに設けられる副
燃焼室は、第１図および第２図の１で示すよう
に、空気と燃料を受け入れるためにコツプ形をな
し、上部は空気および燃料の噴射ノズルに向けて
開放するとともに、底部には噴射炎を主燃焼室へ
向けて噴射する噴火口２が形成してある。 The auxiliary combustion chamber provided in this type of diesel engine is shaped like a cup to receive air and fuel, as shown by 1 in Figures 1 and 2, and the upper part faces the air and fuel injection nozzles. While opening, a nozzle 2 is formed at the bottom for injecting an injection flame toward the main combustion chamber.
しかして、副燃焼室は従来溶解金属材で形成さ
れてきたが、最近耐熱性や耐摩耗性などが優れた
性質を有することから、窒化けい素などのセラミ
ツクスで形成することが試みられている。 Conventionally, sub-combustion chambers have been formed from molten metal materials, but recently attempts have been made to form them from ceramics such as silicon nitride due to their excellent heat resistance and wear resistance. .
そして、従来副燃焼室のような複雑形状の部品
をセラミツクスで製造する場合には、泥しよう鋳
込み成形法、低圧鋳込み成形法あるいは射出成形
法によつて粉末成形体を成形することが試みられ
ている。しかしながら従来のものでは、均質な成
形体を得ることが難かしかつた。これはこれらの
成形方法はいずれも材料粉末を流動状態にして成
形型内部に流し込んで粉末成形体を成形するため
と思われる。すなわちこれらの方法では使用する
粉末にはパラフインなどの通常の粘結剤に加えて
流動性を与えるためにポリスチロールやEVAな
どの粘結剤を添加している。 Conventionally, when manufacturing parts with complex shapes such as auxiliary combustion chambers using ceramics, attempts have been made to mold powder compacts using slurry casting, low-pressure casting, or injection molding. There is. However, with the conventional methods, it has been difficult to obtain a homogeneous molded product. This seems to be because in all of these molding methods, the material powder is made into a fluid state and poured into the mold to form a powder compact. That is, in these methods, in addition to a normal binder such as paraffin, a binder such as polystyrene or EVA is added to the powder to provide fluidity.
しかしながら、ポリスチロールやEVAなどの
粘結剤は、熱分解するためには高温度（400〜500
℃）で長時間（３時間以上）の加熱を必要とする
性質を有している。このため、粉末成形体を成形
した後に、粉末に添加した粘結剤を除去すること
を目的として行なう脱脂工程は、前記の粘結剤の
存在により大変長い時間を要するとともに均一な
脱脂がなかなか困難である。従つて、結果的に副
燃焼室の製造時間が長くなるという問題がある。 However, binders such as polystyrene and EVA require high temperatures (400 to 500
℃) and requires long-term heating (3 hours or more). For this reason, the degreasing process that is carried out for the purpose of removing the binder added to the powder after molding the powder compact takes a very long time due to the presence of the binder, and it is difficult to uniformly degrease it. It is. Therefore, there is a problem that the manufacturing time of the sub-combustion chamber becomes longer as a result.
本発明は前記事情に基づいてなされたもので、
均質なセラミツクスからなるデイーゼルエンジン
などの副燃焼室を生産性良く製造することができ
る内燃機関用副燃焼室及びその製造方法を提供す
ることを目的とする。
The present invention was made based on the above circumstances, and
It is an object of the present invention to provide a sub-combustion chamber for an internal combustion engine, which can manufacture a sub-combustion chamber for a diesel engine or the like made of homogeneous ceramics with high productivity, and a method for manufacturing the same.
本発明の内燃機関用副燃焼室は、セラミツクス
粉末を圧縮成形してなる成形体であつて機械加工
による穿孔部を有することを特徴とする。この内
燃機関用副燃焼室は、成形後脱脂したもの、更に
焼結したものでもよい。また、本発明の内燃機関
用副燃焼室の製造方法は、金型プレスにより粉末
を加圧して、後加工用位置決め部を有する有底の
粉末成形体を成形し、その後に前記粉末成形体の
位置決め部に機械加工を施すことを特徴とするも
のである。
The auxiliary combustion chamber for an internal combustion engine of the present invention is a compact formed by compression molding ceramic powder, and is characterized by having a perforation formed by machining. This sub-combustion chamber for an internal combustion engine may be degreased after molding, or may be sintered. Further, in the method for manufacturing an auxiliary combustion chamber for an internal combustion engine of the present invention, powder is pressurized using a mold press to form a bottomed powder compact having a positioning portion for post-processing, and then the powder compact is The feature is that the positioning part is machined.
本発明が対象とする内燃機関用副燃焼室は、底
部を有するもので、筒形、環形、皿形、碗形など
のいずれでも良い。また、この内燃機関用副燃焼
室は金型プレスにより成形が困難で機械加工を必
要とする部分を有し、その箇所は内燃機関用副燃
焼室の周壁部、底部のいずれでも良く、その形態
も孔、凹凸部など種々のものが適用できる。 The auxiliary combustion chamber for an internal combustion engine to which the present invention is directed has a bottom, and may be cylindrical, ring-shaped, dish-shaped, bowl-shaped, or the like. In addition, this auxiliary combustion chamber for an internal combustion engine has a part that is difficult to mold with a mold press and requires machining, and that location may be either the peripheral wall or the bottom of the auxiliary combustion chamber for an internal combustion engine, and its shape Various shapes such as holes and uneven parts can be applied.
本発明の内燃機関用副燃焼室は、窒化物系セラ
ミツクス、炭化物セラミツクスあるいは酸化物セ
ラミツクスのいずれで成形したものでも良い。 The sub-combustion chamber for an internal combustion engine of the present invention may be formed of any of nitride ceramics, carbide ceramics, or oxide ceramics.
本発明の製造方法は、まず金型プレスにより粉
末を加圧して粉末成形体を成形する。粉末にはパ
ラフインなどの通常の粘結剤を加えるだけで良
く、流動性を付加するための粘結剤を添加する必
要がない。粉末成形体は後加工が必要な箇所を除
いて内燃機関用副燃焼室形状に近い形状に成形す
る。後加工用位置決め部は機械加工が必要な箇所
に、機械加工を容易に行なえるような形状で形成
する。前記金型プレスのような圧縮成形は、粉末
を均質に成形することができる。 In the manufacturing method of the present invention, first, powder is pressed using a mold press to form a powder compact. It is sufficient to add a conventional binder such as paraffin to the powder, and there is no need to add a binder to add flowability. The powder compact is formed into a shape similar to that of an auxiliary combustion chamber for an internal combustion engine, except for areas that require post-processing. The positioning portion for post-processing is formed at a location where machining is required and has a shape that allows easy machining. Compression molding, such as the mold press described above, can uniformly mold powder.
次いで、粉末成形体の位置決め部に機械加工を
行ない所定形状に形成する。機械加工の種類は特
定されない。 Next, the positioning portion of the powder compact is machined to form a predetermined shape. The type of machining is not specified.
その後、脱脂処理を行ない粉末成形体に添加し
てある粘結剤を除去する。粉末成形体を成形する
粉末には通常の粘結剤が添加してあるだけである
から、この粘結剤が熱分解する温度と時間で粉末
成形体を加熱する。例えばパラフインを熱分解す
る場合には、温度200℃、時間1Hである。従つ
て、粉末に流動性を与えるために添加するポリス
チロールなどの粘結剤の熱分解温度および時間に
比して夫々大変小さい。 Thereafter, a degreasing treatment is performed to remove the binder added to the powder compact. Since the powder used to form the powder compact contains only an ordinary binder, the powder compact is heated at a temperature and for a time at which the binder is thermally decomposed. For example, when paraffin is thermally decomposed, the temperature is 200°C and the time is 1 hour. Therefore, it is much lower than the thermal decomposition temperature and time of a binder such as polystyrene which is added to give fluidity to the powder.
さらに、粉末成形体を焼結して焼結体を成形す
る。 Furthermore, the powder compact is sintered to form a sintered body.
以下本発明の一実施例を図面について説明す
る。
An embodiment of the present invention will be described below with reference to the drawings.
本発明を第１図および第２図で示すデイーゼル
エンジンの副燃焼室１をセラミツクスで成形する
場合について説明する。 The present invention will be explained with reference to a case in which the auxiliary combustion chamber 1 of a diesel engine shown in FIGS. 1 and 2 is molded from ceramics.
まず、例えば窒化けい素（Si3N4）粉末に焼結
助剤と粘結剤例えばパラフインを加えて造粒し粉
末を得る。 First, a sintering aid and a binder such as paraffin are added to, for example, silicon nitride (Si 3 N 4 ) powder and granulated to obtain a powder.
次いで、金型プレスにより粉末を成形圧750
Kg／cm2で加圧し、第３図で示す粉末成形体３を成
形する。粉末成形体３の底部の上面および下面に
は、第４図でも示すように副燃焼室１の噴火口２
の開口を形作る位置決め部４，４′を形成する。
位置決め部４，４′は略半円形をなすもので、一
方の位置決め部４の円弧縁部と他方の位置決め部
４′の直線縁部は夫々丸みを有するように形成す
る。この丸みの部分は副燃焼室においてエンジン
の圧縮行程の終わりに、シリンダ内の空気を導入
し、強い渦流を生ぜしめるために、また、着火
後、主燃焼室に効率良く燃焼ガスを移動せしめる
ために重要なものである。なお、この噴火口２の
開口における丸み部分は、切削加工により精度良
く成形することが困難であるが、金型プレスでは
精度良く成形できる。すなわち、位置決め部４，
４′の存在により加圧成形段階で噴火口２の開口
縁部に丸みを形成でき、機械加工による形成に比
して容易で経済的である。 Next, the powder is molded using a mold press at a pressure of 750
Pressure is applied at Kg/cm 2 to form a powder compact 3 shown in FIG. On the upper and lower surfaces of the bottom of the powder compact 3, as shown in FIG.
Positioning portions 4, 4' are formed to form the openings of.
The positioning parts 4, 4' are approximately semicircular, and the arcuate edge of one positioning part 4 and the straight edge of the other positioning part 4' are rounded. This rounded part is used to introduce the air inside the cylinder into the auxiliary combustion chamber at the end of the engine's compression stroke, creating a strong vortex flow, and to efficiently move combustion gas to the main combustion chamber after ignition. It is important to Note that although it is difficult to form the rounded portion of the opening of the crater 2 with high precision by cutting, it can be formed with high precision by mold pressing. That is, the positioning section 4,
4' allows the opening edge of the eruption port 2 to be rounded during the pressure forming step, which is easier and more economical than forming by machining.
次いで、フライス盤などの加圧により位置決め
部４，４に基づいて粉末成形体３の底部に噴火口
２を形成する。この場合、位置決め部４，４′は
噴火口２を形成するために刃物を案内する役目を
なしている。 Next, the eruption port 2 is formed at the bottom of the powder compact 3 based on the positioning parts 4, 4 by applying pressure using a milling machine or the like. In this case, the positioning parts 4, 4' serve to guide the blade in order to form the crater 2.
そして、位置決め部４，４′は機械加工による
粉末成形体でのクラツクの発生を防止できる。 The positioning portions 4, 4' can prevent cracks from occurring in the powder compact due to machining.
次いで、粉末成形体を加熱して脱脂処理を行な
い、粉末に添加したパラフインを熱分解して除去
する。 Next, the powder compact is heated to perform a degreasing treatment, and the paraffin added to the powder is thermally decomposed and removed.
さらに、粉末成形体を焼結して第１図および第
２図で示す副燃焼室１を得る。 Furthermore, the powder compact is sintered to obtain the auxiliary combustion chamber 1 shown in FIGS. 1 and 2.
なお、本発明により副燃焼室を製造する場合に
脱脂時間は960分を要したが、従来の製造方法に
より製造する場合に脱脂時間は6000分を要し、本
発明の場合は1/5の時間に短縮することが判つた。 In addition, when manufacturing the auxiliary combustion chamber according to the present invention, the degreasing time required 960 minutes, whereas when manufacturing the auxiliary combustion chamber using the conventional manufacturing method, the degreasing time required 6000 minutes, and in the case of the present invention, the degreasing time was 1/5. It was found that the time could be reduced.
以上説明したように本発明によれば、均質なセ
ラミツクスからなる内燃機関用副燃焼室を得るこ
とができ、且つこの副燃焼室を製造する上では、
セラミツクス粉末を加圧成形して脱脂工程時間を
減少させることにより製造時間を大幅に減少する
ことができる。また、製造に際して粉末成形体に
位置決め部を形成するので、機械加工時に刃物を
案内して機械加工を容易にすることに加えて、穿
孔部の開口縁部に付ける丸み部分を加圧成形段階
で形成できて機械加工により形成するよりも経済
性が良く、さらに機械加工時に刃物による粉末成
形体でのクラツクの発生を防止できる。
As explained above, according to the present invention, it is possible to obtain a sub-combustion chamber for an internal combustion engine made of homogeneous ceramics, and in manufacturing this sub-combustion chamber,
By press-molding the ceramic powder to reduce the degreasing process time, manufacturing time can be significantly reduced. In addition, since a positioning part is formed on the powder compact during manufacturing, in addition to guiding the cutter during machining to facilitate machining, the rounded part attached to the opening edge of the perforated part is formed during the pressure forming stage. It is more economical than forming by machining, and can prevent cracks in the powder compact due to cutting tools during machining.
第１図および第２図は夫々デイーゼルエンジン
における副燃焼室を示す縦断面図および平面図、
第３図は本発明により第１図および第２図で示す
副燃焼室を製造する実施例における粉末成形体を
示す縦断面図、第４図は同粉末成形体における位
置決め部を示す拡大断面図である。
１……副燃焼室、２……噴火口、３……粉末成
形体、４，４′……位置決め部。
FIG. 1 and FIG. 2 are a longitudinal cross-sectional view and a plan view, respectively, showing the auxiliary combustion chamber in a diesel engine;
FIG. 3 is a longitudinal sectional view showing a powder compact in an embodiment of manufacturing the auxiliary combustion chamber shown in FIGS. 1 and 2 according to the present invention, and FIG. 4 is an enlarged sectional view showing a positioning part in the powder compact. It is. 1... Sub-combustion chamber, 2... Crater, 3... Powder compact, 4, 4'... Positioning part.
Claims (1)
であつて機械加工による穿孔部を有する内燃機関
用副燃焼室。 ２ 穿孔部は、貫通孔である特許請求の範囲第１
項に記載の内燃機関用副燃焼室。 ３ 穿孔部の開口縁部は圧縮成形により形成され
た面取り部を有する特許請求の範囲第１項または
第２項に記載の内燃機関用副燃焼室。 ４ 脱脂したものである特許請求の範囲第１項な
いし第３項のいずれかに記載の内燃機関用副燃焼
室。 ５ 脱脂した後に焼結したものである特許請求の
範囲第４項に記載の内燃機関用副燃焼室。 ６ 粉末を圧縮して、後加工用位置決め部を有す
る有底の粉末成形体を形成し、その後に前記粉末
成形体の位置決め部に機械加工を施すことを特徴
とする内燃機関用副燃焼室の製造方法。 ７ 粉末成形体の底部に後加工用位置決め部を形
成し、この位置決め部に貫通孔を加工する特許請
求の範囲第６項に記載の内燃機関用副燃焼室の製
造方法。[Scope of Claims] 1. An auxiliary combustion chamber for an internal combustion engine, which is a compact formed by compression molding ceramic powder and has a perforation formed by machining. 2. Claim 1, wherein the perforation is a through hole.
A sub-combustion chamber for internal combustion engines as described in . 3. The auxiliary combustion chamber for an internal combustion engine according to claim 1 or 2, wherein the opening edge of the perforation has a chamfered portion formed by compression molding. 4. The auxiliary combustion chamber for an internal combustion engine according to any one of claims 1 to 3, which has been degreased. 5. The auxiliary combustion chamber for an internal combustion engine according to claim 4, which is sintered after being degreased. 6. An auxiliary combustion chamber for an internal combustion engine, characterized in that powder is compressed to form a bottomed powder compact having a positioning section for post-processing, and then the positioning section of the powder compact is machined. Production method. 7. The method for manufacturing an auxiliary combustion chamber for an internal combustion engine according to claim 6, wherein a positioning part for post-processing is formed at the bottom of the powder compact, and a through hole is formed in the positioning part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58177388A JPS6068904A (en) | 1983-09-26 | 1983-09-26 | Ceramics part and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58177388A JPS6068904A (en) | 1983-09-26 | 1983-09-26 | Ceramics part and manufacture thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6068904A JPS6068904A (en) | 1985-04-19 |
| JPS6353922B2 true JPS6353922B2 (en) | 1988-10-26 |
Family
ID=16030064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58177388A Granted JPS6068904A (en) | 1983-09-26 | 1983-09-26 | Ceramics part and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6068904A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0463809U (en) * | 1990-10-09 | 1992-05-29 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0723631B2 (en) * | 1988-11-18 | 1995-03-15 | 株式会社ノザワ | Method for manufacturing resonator type soundproof panel |
| CN109986694A (en) * | 2018-12-28 | 2019-07-09 | 上海中盟石油天然气有限公司 | Make the distribution of PDC drill bit ceramic mold |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5593920A (en) * | 1979-01-11 | 1980-07-16 | Toyota Motor Corp | Construction of engine combustion chamber |
| JPS55114521A (en) * | 1979-02-28 | 1980-09-03 | Asahi Glass Co Ltd | Method of working ceramics stator for gas turbine |
| JPS5623517A (en) * | 1979-08-02 | 1981-03-05 | Toshiba Corp | Sub-combustion chamber in internal combustion engine |
| JPS5691953A (en) * | 1979-12-24 | 1981-07-25 | Riken Corp | Production of combustion chamber insert for diesel engine |
| JPS5898210A (en) * | 1981-12-09 | 1983-06-11 | 株式会社東芝 | Manufacture of ceramic sintered body |
| JPS5831106B2 (en) * | 1979-04-24 | 1983-07-04 | 出光興産株式会社 | thermoplastic resin composition |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6013610Y2 (en) * | 1981-05-08 | 1985-05-01 | 松下電工株式会社 | Molding equipment |
| JPS602891Y2 (en) * | 1981-08-24 | 1985-01-26 | 日本特殊陶業株式会社 | Ceramic green sheet punching mold |
-
1983
- 1983-09-26 JP JP58177388A patent/JPS6068904A/en active Granted
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5593920A (en) * | 1979-01-11 | 1980-07-16 | Toyota Motor Corp | Construction of engine combustion chamber |
| JPS55114521A (en) * | 1979-02-28 | 1980-09-03 | Asahi Glass Co Ltd | Method of working ceramics stator for gas turbine |
| JPS5831106B2 (en) * | 1979-04-24 | 1983-07-04 | 出光興産株式会社 | thermoplastic resin composition |
| JPS5623517A (en) * | 1979-08-02 | 1981-03-05 | Toshiba Corp | Sub-combustion chamber in internal combustion engine |
| JPS5691953A (en) * | 1979-12-24 | 1981-07-25 | Riken Corp | Production of combustion chamber insert for diesel engine |
| JPS5898210A (en) * | 1981-12-09 | 1983-06-11 | 株式会社東芝 | Manufacture of ceramic sintered body |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0463809U (en) * | 1990-10-09 | 1992-05-29 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6068904A (en) | 1985-04-19 |
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