JPH0426656Y2 - - Google Patents
Info
- Publication number
- JPH0426656Y2 JPH0426656Y2 JP11252985U JP11252985U JPH0426656Y2 JP H0426656 Y2 JPH0426656 Y2 JP H0426656Y2 JP 11252985 U JP11252985 U JP 11252985U JP 11252985 U JP11252985 U JP 11252985U JP H0426656 Y2 JPH0426656 Y2 JP H0426656Y2
- Authority
- JP
- Japan
- Prior art keywords
- piston
- cavity
- valve
- combustion chamber
- valve recess
- 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 11
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 239000000446 fuel Substances 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
Landscapes
- Combustion Methods Of Internal-Combustion Engines (AREA)
Description
【考案の詳細な説明】
［産業上の利用分野］
本考案は、直接噴射式のデイーゼルエンジンの
燃焼室に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a combustion chamber of a direct injection diesel engine.
［従来の技術］
従来、第４図〜第６図に示すようにこの種の燃
焼室におけるピストン１の頂部にはキヤビテイ２
とこのキヤビテイ２の周囲に吸排気バルブの逃げ
部となるバルブリセス３及び４が凹設される。従
来のバルブリセス３及び４はその底面がピストン
１の頂面１ａに対して平行に形成され、キヤビテ
イ２に連続する。このためバルブリセス３及び４
はピストン１の圧縮上死点において、スキツシユ
がキヤビテイ２内に入り込む通路になつている。[Prior Art] Conventionally, as shown in FIGS. 4 to 6, a cavity 2 is provided at the top of the piston 1 in this type of combustion chamber.
Valve recesses 3 and 4 are recessed around the cavity 2 and serve as relief portions for the intake and exhaust valves. The conventional valve recesses 3 and 4 have their bottom surfaces parallel to the top surface 1a of the piston 1 and are continuous with the cavity 2. Therefore, valve recesses 3 and 4
is a passage through which the squish enters into the cavity 2 at the compression top dead center of the piston 1.
［考案が解決しようとする問題点］
従来のバルブリセスの底面はピストンの頂面に
対して平行に形成されているため、ピストンの圧
縮上死点におけるスキツシユが円滑にキヤビテイ
に入り込まず、燃料が吸入空気と十分に混合され
ず、未燃焼の排気ガスが排出されることがあつ
た。[Problems that the invention aims to solve] Because the bottom surface of the conventional valve recess is formed parallel to the top surface of the piston, the piston's compression stroke at the top dead center does not enter the cavity smoothly, preventing fuel from being sucked in. In some cases, unburned exhaust gas was emitted because it was not mixed sufficiently with air.
本考案の目的は、燃焼室内の空気流動を強め、
燃料と吸入空気の混合を促進して排気ガスの黒
煙、一酸化炭素等を低減するデイーゼルエンジン
の燃焼室を提供することにある。 The purpose of this invention is to strengthen the air flow inside the combustion chamber,
An object of the present invention is to provide a combustion chamber for a diesel engine that promotes mixing of fuel and intake air to reduce black smoke, carbon monoxide, etc. in exhaust gas.
［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、本考案の燃焼室は
バルブリセスの底面をスワール方向に沿つてバル
ブリセスが深くなるように傾斜して形成したもの
である。[Means for Solving the Problems] In order to achieve the above object, the combustion chamber of the present invention is formed such that the bottom surface of the valve recess is inclined so that the valve recess becomes deeper along the swirl direction.
［作用］
ピストンが圧縮上死点に近づくにつれて発生す
るスキツシユは円滑にキヤビテイ内に入り、空気
流動が増大する。[Operation] As the piston approaches compression top dead center, the squish that occurs smoothly enters the cavity, increasing air flow.
［実施例］ 以下実施例図面により説明する。[Example] This will be explained below with reference to the drawings.
第１図〜第３図に示すように、ピストン１１の
頂部に凹設されたキヤビテイ１２の周囲に吸気バ
ルブ用のバルブリセス１３及び排気バルブ用のバ
ルブリセス１４がキヤビテイ１２より浅くそれぞ
れ凹設される。これらのバルブリセス１３及び１
４の底面はピストン１１の頂面１１ａに対して傾
斜して形成される。この傾斜方向は第３図の矢印
に示すスワール方向に沿つて、バルブリセス１３
及び１４が深くなるように決められ、その最深部
はキヤビテイ１２の周縁に達する。 As shown in FIGS. 1 to 3, a valve recess 13 for an intake valve and a valve recess 14 for an exhaust valve are each formed shallower than the cavity 12 around the cavity 12 formed in the top of the piston 11. These valve recesses 13 and 1
The bottom surface of the piston 4 is formed to be inclined with respect to the top surface 11a of the piston 11. This direction of inclination is along the swirl direction shown by the arrow in FIG.
and 14 are determined to be deep, with the deepest part reaching the periphery of the cavity 12.
このように構成することにより、ピストン１１
が圧縮上死点に近づくにつれて発生するスキツシ
ユは第３図の矢印に示すスワール方向に移動する
が、バルブリセス１３及び１４の底面がスワール
方向に沿つて深くなるように傾斜しているため、
スキツシユは勢いよくキヤビテイ１２内に入り込
む。これにより燃焼室内の空気流動が強められ、
強い渦流が形成されて燃料と吸入空気との混合が
促進される。 With this configuration, the piston 11
The squish that occurs as the valve approaches the compression top dead center moves in the swirl direction shown by the arrow in FIG.
Skitsyu enters Cavity 12 with great force. This strengthens the air flow inside the combustion chamber,
A strong vortex is formed to promote mixing of fuel and intake air.
［考案の効果］
以上述べたように、本考案によればバルブリセ
スの底面に傾斜をつけることにより、スキツシユ
を強化するため燃焼速度が高められ、燃焼室内の
燃料が完全燃焼して排気ガスの黒煙、一酸化炭素
等の低減を図ることができる。[Effects of the invention] As described above, according to the invention, by sloping the bottom of the valve recess, the combustion speed is increased to strengthen the compression, and the fuel in the combustion chamber is completely combusted, resulting in black exhaust gas. It is possible to reduce smoke, carbon monoxide, etc.
第１図は本考案実施例燃焼室のピストン頂部を
示す第３図のAA線断面図。第２図は同じくピス
トン頂部を示す第３図のBB線断面図。第３図は
本考案実施例デイーゼルエンジンのピストンの平
面図。第４図は従来例のピストン頂部を示す第６
図のCC線断面図。第５図は従来例のピストン頂
部を示す第６図のDD線断面図。第６図は従来例
デイーゼルエンジンのピストンの平面図。
１，１１……ピストン、２，１２……キヤビテ
イ、３，４，１３，１４……バルブリセス。
FIG. 1 is a sectional view taken along the line AA in FIG. 3 showing the top of the piston of the combustion chamber according to the embodiment of the present invention. FIG. 2 is a sectional view taken along line BB of FIG. 3, also showing the top of the piston. FIG. 3 is a plan view of a piston of a diesel engine according to an embodiment of the present invention. Figure 4 is the sixth figure showing the top of a conventional piston.
A cross-sectional view taken along the CC line in the figure. FIG. 5 is a sectional view taken along line DD in FIG. 6 showing the top of a conventional piston. FIG. 6 is a plan view of a piston of a conventional diesel engine. 1, 11... Piston, 2, 12... Cavity, 3, 4, 13, 14... Valve recess.
Claims (1)
キヤビテイの周囲にこのキヤビテイより浅く凹設
されかつこのキヤビテイに連続するように形成さ
れたバルブリセスとを備えたデイーゼルエンジン
の燃焼室において、 上記バルブリセスの底面をスワール方向に沿つ
て上記バルブリセスの深さが大きくなるように傾
斜して形成したことを特徴とするデイーゼルエン
ジンの燃焼室。[Claims for Utility Model Registration] Combustion of a diesel engine equipped with a cavity recessed in the top of the piston and a valve recess formed around the cavity to be shallower than the cavity and continuous with the cavity. A combustion chamber for a diesel engine, wherein the bottom surface of the valve recess is formed to be inclined so that the depth of the valve recess increases along the swirl direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11252985U JPH0426656Y2 (en) | 1985-07-23 | 1985-07-23 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11252985U JPH0426656Y2 (en) | 1985-07-23 | 1985-07-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6221438U JPS6221438U (en) | 1987-02-09 |
| JPH0426656Y2 true JPH0426656Y2 (en) | 1992-06-26 |
Family
ID=30993490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11252985U Expired JPH0426656Y2 (en) | 1985-07-23 | 1985-07-23 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0426656Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10046420B4 (en) * | 2000-09-20 | 2009-05-28 | Mahle Gmbh | Method of producing a bowl edge rounding |
| DE102017221527A1 (en) * | 2017-11-30 | 2019-06-06 | Man Energy Solutions Se | Valve Piston System of an internal combustion engine and internal combustion engine |
-
1985
- 1985-07-23 JP JP11252985U patent/JPH0426656Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6221438U (en) | 1987-02-09 |
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