CN201202543Y - Combustion chamber structure on engine cylinder cap - Google Patents
Combustion chamber structure on engine cylinder cap Download PDFInfo
- Publication number
- CN201202543Y CN201202543Y CNU2008200979873U CN200820097987U CN201202543Y CN 201202543 Y CN201202543 Y CN 201202543Y CN U2008200979873 U CNU2008200979873 U CN U2008200979873U CN 200820097987 U CN200820097987 U CN 200820097987U CN 201202543 Y CN201202543 Y CN 201202543Y
- Authority
- CN
- China
- Prior art keywords
- combustion chamber
- engine
- wall
- cylinder cap
- firing chamber
- 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 - Fee Related
Links
- 238000002485 combustion reaction Methods 0.000 title abstract description 14
- 230000007704 transition Effects 0.000 claims abstract description 11
- 238000010304 firing Methods 0.000 claims description 26
- 239000007789 gas Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000009795 derivation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 210000004072 lung Anatomy 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 206010014561 Emphysema Diseases 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 206010035664 Pneumonia Diseases 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Abstract
Disclosed is a combustion chamber structure on an engine cylinder head; the cylinder head of the combustion chamber is pit-shaped; an intake valve seat ring mounting hole, an exhaust valve seat ring mounting hole and a spark plug mounting hole are arranged on the wall of the combustion chamber; and an arc R transition or smooth transition is formed between the external circumferential edge of the combustion chamber wall and the end face of the cylinder head. Compared with the traditional engine of the same type, the engine with the technical proposal of the utility model avoids the ultra-high temperature situation at the external circumferential edge of the combustion chamber wall, and the NOx content in the engine exhaust emission can be reduced by 10-20%.
Description
Technical field
The utility model belongs to technical field of engines, specifically, relates to the improvement design of engine cylinder cover upper combustion chamber structure.
Background technique
During engine operation, piston is reciprocating in cylinder, and when piston was positioned at top dead center position, piston head and the formed space of cylinder head internal surface were called the firing chamber.Direct injection combustion chamber (also claiming unified formula firing chamber) mostly appears on piston or the cylinder cap with the pit form.
There are bath-tub type, wedge type, hemisphere type etc. in the firing chamber of pit form on the engine cylinder cover at present, and is wherein in the majority with hemisphere type.That mixed gas enters is compressed behind the firing chamber, discharge after the work by combustion, because the effect of high temperature, high pressure, airborne oxygen and nitrogen can generate NO and minor N O in the firing chamber
2Discharge with tail gas, NO is oxidized to NO again after entering atmosphere
2So, being referred to as NOx, the NOx in the motor exhaust can enter the human lung through breathing, combines to generate rare nitric acid the infringement health with steam in the lung; In addition, HC adds that NOx under solar radiation, can form photochemical smog, can stimulate people's eyes, causes pneumonia, pulmonary emphysema and carcinogenic effect, so the NOx in the motor exhaust is very harmful gas, must strictly control as the engine emission index.
From the formation mechanism of engine emission pollutant, the generation of NOx mainly is because high temperature and oxygen enrichment in the firing chamber cause.Therefore, for reducing the NOx content in the exhaust emissions, should put forth effort to solve the cooling problem of firing mixed gas in the firing chamber eventually.Structure from available engine cylinder cap upper combustion chamber, be the wedge angle transition between combustion chamber wall surface outer periphery and the cylinder cap end face, find by the hot-fluid analysis, form the dead angle during firing chamber heat conduction easily in the border, make that heat transfer, the heat-conducting effect at this place are not good, border, firing chamber temperature is too high, and the surface is hot, thereby has caused in the engine exhaust emission content of NOx higher.
The model utility content
Problem to be solved in the utility model provides the chamber structure that a kind of engine cylinder that can obviously reduce NOx content in the engine exhaust emission covers.
For solving the problems of the technologies described above, the chamber structure that the engine cylinder that the utility model provides covers, its firing chamber is dimple-shaped on cylinder cap, the wall of firing chamber is provided with inlet and outlet gate seat circle mounting hole and spark plug mounting hole, is circular arc R transition or rounding off between the outer periphery of chamber wall and the cylinder cap end face.
After adopting circular arc R transition or rounding off structure between chamber wall outer periphery and the cylinder cap end face, find that can not form the dead angle at chamber wall outer periphery place during heat conduction, transmission of heat is smooth and easy by the hot-fluid analysis.The heat of chamber wall is easy to outside derivation when mixture combustion does work at the end, can the phenomenon of temperature superelevation not occur at The combustion chamber wall outer periphery place, thereby the NOx discharge amount in the motor exhaust is significantly reduced.Make installation and test contrast verification by exemplar, adopt the motor of this structure firing chamber can reduce the NOx effulent up to 10%～20% than motor of the same type.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is the A-A sectional view of Fig. 1.
Fig. 3 is the partial enlarged drawing of Fig. 2.
Fig. 4 is the B-B sectional view of Fig. 1.
Fig. 5 is that the C of Fig. 2 is to view.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples:
Extremely shown in Figure 5 as Fig. 1, the chamber structure that engine cylinder described in the utility model covers is: firing chamber 1 is dimple-shaped on cylinder cap 2, the wall of firing chamber 1 is provided with inlet and outlet gate seat circle mounting hole 3,4 and spark plug mounting hole 5, and D is circular arc R transition or rounding off between the outer periphery of firing chamber 1 wall and cylinder cap 2 end faces.
After adopting said structure, eliminated the wedge angle between firing chamber 1 wall outer periphery and cylinder cap 2 end faces, can not form the dead angle in 1 wall outer periphery place when making its heat conduction, made transmission of heat smooth and easy in the firing chamber.The heat of firing chamber 1 wall is easy to outside derivation when mixture combustion does work at the end, can the phenomenon of temperature superelevation not occur in 1 wall outer periphery place in the firing chamber, thereby the NOx discharge amount in the motor exhaust is significantly reduced.On the CG125 motor, make installation and test contrast verification by exemplar, adopt the CG125 motor of this structure firing chamber can reduce the NOx effulent up to 10%～20% than common CG125 motor.
Be preferably the transition of single-curvature circular arc R between the outer periphery of firing chamber 1 wall and cylinder cap 2 end faces, be convenient to processing like this.
The utility model is with after adopting circular arc R transition or rounding off structure between the outer periphery of chamber wall and the cylinder cap end face, chamber wall is directly by cast form during manufacturing, the machine added-time only need be processed the cylinder cap end face, circular arc R transition or rounding off place form the squish face naturally, do not need again chamber wall outer periphery position to be processed, simplify manufacturing process, improved manufacturing efficiency.
Claims (2)
1, the chamber structure that covers of a kind of engine cylinder, firing chamber (1) is dimple-shaped on cylinder cap (2), the wall of firing chamber (1) is provided with inlet and outlet gate seat circle mounting hole (3,4) and spark plug mounting hole (5), it is characterized in that: (D) is circular arc R transition or rounding off between the outer periphery of described firing chamber (1) wall and cylinder cap (2) end face.
2, the chamber structure that covers of engine cylinder according to claim 1 is characterized in that: (D) is the transition of single-curvature circular arc R between the outer periphery of described firing chamber (1) wall and cylinder cap (2) end face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200979873U CN201202543Y (en) | 2008-04-07 | 2008-04-07 | Combustion chamber structure on engine cylinder cap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200979873U CN201202543Y (en) | 2008-04-07 | 2008-04-07 | Combustion chamber structure on engine cylinder cap |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201202543Y true CN201202543Y (en) | 2009-03-04 |
Family
ID=40424857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200979873U Expired - Fee Related CN201202543Y (en) | 2008-04-07 | 2008-04-07 | Combustion chamber structure on engine cylinder cap |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201202543Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105849381A (en) * | 2013-12-26 | 2016-08-10 | 丰田自动车株式会社 | Combustion chamber structure of spark-ignition internal combustion engine |
| CN108798872A (en) * | 2018-06-21 | 2018-11-13 | 江苏大学 | Combustion chamber, cylinder head and miniature gasoline engine |
-
2008
- 2008-04-07 CN CNU2008200979873U patent/CN201202543Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105849381A (en) * | 2013-12-26 | 2016-08-10 | 丰田自动车株式会社 | Combustion chamber structure of spark-ignition internal combustion engine |
| CN108798872A (en) * | 2018-06-21 | 2018-11-13 | 江苏大学 | Combustion chamber, cylinder head and miniature gasoline engine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090304 Termination date: 20110407 |