JPS59126025A - Diesel engine with subsidiary chamber - Google Patents
Diesel engine with subsidiary chamberInfo
- Publication number
- JPS59126025A JPS59126025A JP58001547A JP154783A JPS59126025A JP S59126025 A JPS59126025 A JP S59126025A JP 58001547 A JP58001547 A JP 58001547A JP 154783 A JP154783 A JP 154783A JP S59126025 A JPS59126025 A JP S59126025A
- Authority
- JP
- Japan
- Prior art keywords
- metal gasket
- cylinder
- cylinder head
- chamber
- diesel engine
- 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.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B19/00—Engines characterised by precombustion chambers
- F02B19/14—Engines characterised by precombustion chambers with compression ignition
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
この発明はピストン上面の主燃焼室に透孔を介して連通
する副室を設けた、副室付ジーゼル機関に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a diesel engine with a subchamber that is provided with a subchamber that communicates with a main combustion chamber on the upper surface of a piston through a through hole.
自動二輪車や自動車用に用いられる小型の副室付ジーゼ
ル機関は高度の高速運転性能が要求されるため、ピスト
ンの直径を比較的大きく、かつその行程は短く設定され
る。そのため、シリンダヘッドの頂面とピストン頂面と
の間隙を極めて小さく設定しないと所要の圧縮比が設定
できなくなるので、シリンダとシリンダヘッドとの間を
密封するガスケットは多く用いられている石綿入りの鋼
板製のものに代えてステンレス鋼その他のばね材からな
り、シリンダ孔の周囲にビードを形成した所甜金属ガス
ケットの採用が好ましい。A small diesel engine with a subchamber used for motorcycles and automobiles is required to have a high degree of high-speed operation performance, so the diameter of the piston is relatively large and the stroke thereof is set to be short. Therefore, unless the gap between the top surface of the cylinder head and the top surface of the piston is set extremely small, the required compression ratio cannot be set. Instead of a steel plate, it is preferable to use a steel gasket made of stainless steel or other spring material with a bead formed around the cylinder hole.
ところで副室付ジーゼル機関にあっては燃料噴射ノズル
から噴射される燃料の霧化を促進するため副室の内壁温
度を３５０℃前後の高温に維持することが必要である。By the way, in a diesel engine with a pre-chamber, it is necessary to maintain the inner wall temperature of the pre-chamber at a high temperature of around 350° C. in order to promote atomization of the fuel injected from the fuel injection nozzle.
すなわち、燃料の霧化が悪いと着火遅れを生じジーゼル
ノックの原因となり、静粛で効率のよい燃焼が得られな
くなる。That is, poor atomization of fuel causes ignition delay and causes diesel knock, making it impossible to achieve quiet and efficient combustion.
然しなから金属製のガスケットは熱伝導性がよいため冷
却水によって１００℃前後の低温に維持されているシリ
ンダによって副室が冷却されてしまい、副室内を所要の
高温に保つのが困難になる。However, because metal gaskets have good thermal conductivity, the subchamber is cooled by the cylinder, which is maintained at a low temperature of around 100℃ by cooling water, making it difficult to maintain the prechamber at the required high temperature. .
この発明は上記不具合を解決すべくなされたもので、シ
リンダ、シリンダヘッド間を金属ガスケットで密封する
と共に、シリンダヘッドの副室下面に肉抜き溝を形成す
ることにより、小型で高速のジーゼル機関を提供するも
のである。This invention was made in order to solve the above-mentioned problems, and by sealing the cylinder and cylinder head with a metal gasket and forming a lightening groove on the lower surface of the sub-chamber of the cylinder head, a small and high-speed diesel engine can be realized. This is what we provide.
以下、図示の実施例によって説明すると、１は四行程副
室付ジーゼル機関であり、シリンダ２とシリンダヘッド
３及びピストン４とによって燃焼室５を形成している。Hereinafter, a description will be given with reference to the illustrated embodiment. Reference numeral 1 denotes a four-stroke diesel engine with an auxiliary chamber, and a combustion chamber 5 is formed by a cylinder 2, a cylinder head 3, and a piston 4.
燃焼室５はピストン４の上面に形成される主燃焼室５ａ
と、透孔６を介して主燃焼室５ａに連なる副室５ｂ
とからなる。７は副室５ｂ内に臨んで設けられた燃料噴
射ノズル、８は電熱ヒーターである。９は吸気弁９ａを
介して主燃焼室５ａに連カる吸気通路、１Ｇは排気弁Ｉ
Ｑａを介して主燃焼室５８ に連なる排気通路である
０
副室５ｂは第２図、第３図で示すように、シリンダヘッ
ド３の下面に形成された開口部に、透孔６を形成したノ
ズル部材６ａを嵌合して閉じである０ノズル部材６ａの
下面はシリンダ２とシリンダヘッド３との間に介装され
たステンレス材からなる金属ガスケット１１に接してお
り、金属ガスケット１１を介してシリンダ２の冷却水ジ
ャケラ）２ａに面している。The combustion chamber 5 is a main combustion chamber 5a formed on the upper surface of the piston 4.
and an auxiliary chamber 5b connected to the main combustion chamber 5a through the through hole 6.
It consists of. 7 is a fuel injection nozzle provided facing into the auxiliary chamber 5b, and 8 is an electric heater. 9 is an intake passage connected to the main combustion chamber 5a via an intake valve 9a, and 1G is an exhaust valve I.
The auxiliary chamber 5b, which is an exhaust passage connected to the main combustion chamber 58 via Qa, has a through hole 6 formed in the opening formed on the lower surface of the cylinder head 3, as shown in FIGS. 2 and 3. The lower surface of the nozzle member 6a, which is closed when the nozzle member 6a is fitted, is in contact with a metal gasket 11 made of stainless steel interposed between the cylinder 2 and the cylinder head 3. It faces the cooling water jacket (2a) of the cylinder 2.
１２はノズル部材６ａの金属ガスケット１１と接する部
分に設けた肉抜き溝であり、燃焼ガスの吹き抜けを防止
するに必要な最少源の面のみを残して半月形に肉抜きし
て断熱用の保温空間を形成しである。Reference numeral 12 denotes a hollow groove provided in the part of the nozzle member 6a in contact with the metal gasket 11, and is hollowed out in a half-moon shape, leaving only the minimum source surface necessary to prevent combustion gas from blowing through, for heat insulation. It forms a space.
なお、金属ガスケット１１はステンレス材からプレス成
形して、第４図で示すようにシリンダ孔に添って局部的
に面圧を上げるだめの突起、所謂ビードＩｌａを形成し
たものである０この実施例ではシリンダ孔に沿って形成
されたビード１１ａの一部１１ｂが外側へ膨出してノズ
ル部材６ａの外側を囲繞し、ノズル部材６ａが加工誤差
や熱膨張のためシリンダヘッド３の下面に若干突出する
ことがあっても既燃ガスが外部へ吹き抜けないよう配慮
しである。従って、この実施例によれば、ピストン４の
圧縮行程終期に、断熱圧縮されて高温に昇温した吸気中
へ燃料噴射ノズルＴかも燃料が噴射されて燃料に着火し
、燃焼ガスが透孔６を通して主燃焼！ｉ１５ ｍに噴出
して燃焼を完結する。この過程で副室５ｂは強く熱せら
れ、肉抜きｎ１２によって保温されているので、内壁の
温度を高く保つことができ、そこへ噴射される燃料は直
ちに気化し、壁面に付着して着火遅れの原因となること
がなく、金属ガスケット１１の採用に同等支障を来たす
ことがない。The metal gasket 11 is press-molded from a stainless steel material, and has so-called beads Ila, which are protrusions along the cylinder hole to locally increase surface pressure, as shown in FIG. 4. In this case, a part 11b of the bead 11a formed along the cylinder hole bulges outward and surrounds the outside of the nozzle member 6a, and the nozzle member 6a slightly protrudes from the lower surface of the cylinder head 3 due to processing errors and thermal expansion. Care must be taken to prevent burnt gas from escaping to the outside. Therefore, according to this embodiment, at the end of the compression stroke of the piston 4, fuel is injected from the fuel injection nozzle T into the intake air which has been adiabatically compressed and heated to a high temperature, igniting the fuel, and the combustion gas flows into the through hole 6. Main combustion through! It erupts at 15 m and completes combustion. During this process, the auxiliary chamber 5b is strongly heated and kept warm by the thinning hole n12, so the temperature of the inner wall can be kept high, and the fuel injected there vaporizes immediately and adheres to the wall surface, causing ignition delay. This will not cause any problems, and will not cause any trouble to the use of the metal gasket 11.
この発明の副室付ジーゼル機関は以上のように、シリン
ダとシリンダヘッドとの間を金属ガスケットによって密
封すると共に、シリンダヘッドの副室下面と金属ガスケ
ットとの接触部に肉抜き溝を形成し伝熱を遮断したもの
であるから、金属ガスケット１１の使用が同等支障なく
行い得る。よつ ゛て、シリンダの直径に比し、
比較的行程の短い小型高速のジーゼル機関を具現できる
。前記実施例によれば、−気筒当たりの行程容積は２５
０ｃｃであり、約８００Ｏｒ、ｐ、ｍの高速運転が可能
で６つた。また、金属ガスケットの使用にニジ、燃焼室
の頂面とピストンの上面との間隙が精度よく得られるの
で、この間隙を非常に小さく設定できる。As described above, the diesel engine with a pre-chamber of the present invention seals the space between the cylinder and the cylinder head with a metal gasket, and also forms a thinning groove in the contact area between the lower surface of the sub-chamber of the cylinder head and the metal gasket, thereby transmitting power. Since it blocks heat, the metal gasket 11 can be used without any problem. Therefore, compared to the diameter of the cylinder,
A compact, high-speed diesel engine with a relatively short stroke can be realized. According to the embodiment, the stroke volume per cylinder is 25
0cc, high speed operation of approximately 800 Or, p, m was possible. Further, because of the use of a metal gasket, the gap between the top surface of the combustion chamber and the top surface of the piston can be obtained with high precision, so this gap can be set very small.
換言すれば、ピストンの上面の空間容積を小さくして副
室の容積を大きく設定することができる。In other words, the volume of the auxiliary chamber can be set large by reducing the spatial volume of the upper surface of the piston.
この容積拡大は噴射された燃料の飛行距離を伸ばし、着
火性を一層向上させ静粛かつ効率のよい運転が可能とな
る。This volume expansion extends the flight distance of the injected fuel, further improves ignitability, and enables quiet and efficient operation.
図面はこの発明の一実施例を示すものであυ、第１図は
副室付ジーゼル機関の要部の断面図、第２図はその要部
の拡大断面図、第３図はそのＩ−■断面図、第４図は金
属ガスケットの要部を示す断面図である。
５＠・・・燃焼室、５邑・＠＠自主燃焼室、５ｂψ・・
・副室、６・鳥・・透孔、６ａ・・・・ノズル部材、１
１・嗜・・金属ガスケツ）、１２−・・・肉抜き溝。
特許出願人 ヤマハ発動機株式会社
代理人山川政樹（ほか１名）
第１図The drawings show one embodiment of the present invention. Figure 1 is a cross-sectional view of the main parts of a diesel engine with a pre-chamber, Figure 2 is an enlarged cross-sectional view of the main parts, and Figure 3 is an I- (2) Cross-sectional view FIG. 4 is a cross-sectional view showing the main parts of the metal gasket. 5＠・・・Combustion chamber, 5＠＠Independent combustion chamber, 5bψ・・
・Subchamber, 6・Bird・・Through hole, 6a・・Nozzle member, 1
1. Metal gasket), 12-... Lightening groove. Patent applicant: Yamaha Motor Co., Ltd. Agent Masaki Yamakawa (and one other person) Figure 1
Claims (3)
トによって密封すると共に、シリンダヘッドの副室下面
と金属ガスケットとの接触部に肉抜き溝を形成し、金属
ガスケットとの間に保温空間を形成してなる副室付ジー
ゼル機関。(1) The space between the cylinder and the cylinder head is sealed with a metal gasket, and a groove is formed in the contact area between the lower surface of the sub-chamber of the cylinder head and the metal gasket to form a heat-retaining space between the metal gasket and the cylinder head. A diesel engine with an auxiliary chamber.
ズル部材で蓋をして形成しである特許請求の範囲第１項
記載の副室付ジーゼル機関。(2) A diesel engine with a sub-chamber according to claim 1, wherein the sub-chamber is formed by covering a recess formed on the lower surface of the cylinder head with a nozzle member.
らなり、そのビード部はノズル部材の外側に形成されて
いる特許請求の範囲第１項記載の副室付ジーゼル機関。(3) The diesel engine with a pre-chamber according to claim 1, wherein the metal gasket is made of stainless steel or other spring material, and the bead portion thereof is formed on the outside of the nozzle member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58001547A JPS59126025A (en) | 1983-01-08 | 1983-01-08 | Diesel engine with subsidiary chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58001547A JPS59126025A (en) | 1983-01-08 | 1983-01-08 | Diesel engine with subsidiary chamber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59126025A true JPS59126025A (en) | 1984-07-20 |
Family
ID=11504544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58001547A Pending JPS59126025A (en) | 1983-01-08 | 1983-01-08 | Diesel engine with subsidiary chamber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59126025A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60157925U (en) * | 1984-03-28 | 1985-10-21 | ダイハツ工業株式会社 | Vortex chamber diesel engine |
| US6955012B2 (en) | 1999-12-15 | 2005-10-18 | Kabushiki Kaisha Muzukuwa | Roof and roof board material |
-
1983
- 1983-01-08 JP JP58001547A patent/JPS59126025A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60157925U (en) * | 1984-03-28 | 1985-10-21 | ダイハツ工業株式会社 | Vortex chamber diesel engine |
| US6955012B2 (en) | 1999-12-15 | 2005-10-18 | Kabushiki Kaisha Muzukuwa | Roof and roof board material |
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