CN2644689Y - Internal combustion engine piston capable of improving air utilization ratio - Google Patents
Internal combustion engine piston capable of improving air utilization ratio Download PDFInfo
- Publication number
- CN2644689Y CN2644689Y CN 03277848 CN03277848U CN2644689Y CN 2644689 Y CN2644689 Y CN 2644689Y CN 03277848 CN03277848 CN 03277848 CN 03277848 U CN03277848 U CN 03277848U CN 2644689 Y CN2644689 Y CN 2644689Y
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- China
- Prior art keywords
- internal combustion
- combustion engine
- cylinder
- air
- utility
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- Expired - Lifetime
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Abstract
The utility model discloses an internal combustion engine piston which improves air using rate; the utility model is characterized in that: an inclined gas vent which is communicated with the combustion room is arranged on the top part around the combustion room; the inclination direction suits for vortex rotation direction after air enters the cylinder. Better shape for the gas vent is spiral shape that the width is increasingly bigger from inner to outer; the travelling direction is as below: an angle between normal direction at any point at the edge of the vent port and the vortex motion direction inside the cylinder is zero to ninety degrees. The utility model has the advantages of suiting for the internal combustion engine and particularly for a direct injection internal combustion engine which adopts spiral and tangent intake duct with cylinder diameter 75 to 115 mm, ability of promoting air in compression clearance enter into the combustion room, increasing the air density inside the combustion room, improving the fuel consumption, smoke density and emission index inside the internal combustion room.
Description
Technical field
The utility model relates to a kind of internal combustion engine, particularly adopts spiral and tangential inlet duct, and cylinder bore is the piston of the direct-injection internal combustion engine of 75～115mm.
Background technique
Generally, for the direct-injection internal combustion engine piston, its top is provided with combustion recess, and the piston-top surface around the firing chamber is a plate armature.Piston is near top dead center the time, and the quality of air utilization ratio has a significant impact for the quality of engine performance in the compression clearance between its end face and the cylinder head bottom plane.For the direct-injection internal combustion engine that adopts spiral or tangential inlet duct, after air enters cylinder by intake duct, rotate around cylinder axis, form eddy current, and fuel oil sprays into by oil sprayer and burns in the firing chamber, and the utilization ratio of air is very high in the firing chamber, and the piston of existing dull and stereotyped top surface structure, because air can not replenish in the firing chamber in the compression clearance, so the utilization ratio of this part air is very low.
Owing to air utilization ratio in the compression clearance is low, directly have influence on engine performance in the prior art, cause fuel consumption rate up to 250g/kw.h, smoke intensity is permitted up to 3 ripples, and delivery temperature reaches 600 ℃.
The model utility content
The technical problems to be solved in the utility model is: overcome the deficiencies in the prior art part, a kind of utilization ratio that improves air in the compression clearance is provided, thereby improve the internal combustion engine piston of engine performance.
The utility model is realized above-mentioned purpose by increasing gas guide groove at piston-top surface.
The technical solution of the utility model is: the piston-top surface around in the piston head firing chamber is provided with the oblique gas guide groove that leads to the firing chamber, the eddy current sense of rotation that its true dip direction and air enter behind the cylinder adapts, groove depth a is 0.6～1mm, slot opening b is 2～16mm, and the boss width c between adjacent slot is 3～8mm.The gas guide groove sectional shape is trapezoidal, also can be rectangle or triangle.
Further technological scheme is: the groove width b of above-mentioned gas guide groove increases from inside to outside gradually; Gas guide groove is a helical, and its trend is that the Normal direction of any point p of notch edges place and the angle α of the interior eddy motion direction of cylinder are 0 °～90 °.Gas guide groove also can be the compound of straight line type or straight line and curve.
Optimum scheme is that described groove depth a is 0.8mm, and slot opening b is: the 5mm of burner port edge, the 15mm of outside piston place.
Adopt above technological scheme, when piston motion is near compression top center, in cylinder under the rotatory inertia effect of air swirl, because the existence of piston-top surface gas guide groove, and the trend of gas guide groove and eddy current direction adapt, the air that then compresses in the clearance just enters the firing chamber smoothly by gas guide groove, thereby has increased the concentration of firing chamber air, and fuel consumption rate, smoke intensity and the exhaust index of internal-combustion engine are improved.
Description of drawings
Fig. 1 is plan view of the present utility model (a top structure schematic representation), and the D arrow is represented air swirl rotation direction in the cylinder, and P is an any point on the gas guide groove notch, and O is a cylinder axis,
Be P point place air swirl direction,
Be P point place gas guide groove Normal direction, both angles are α;
Fig. 2 is along the echelon sectional view of B-B line among Fig. 1;
Fig. 3 is along A-A line partial sectional view among Fig. 1.
Embodiment
With reference to accompanying drawing, the end face of piston 1 is provided with the spiral chute 3 of the trapezoid cross section that connects firing chamber 2 and outside piston, and groove depth is a, and slot opening is b, and the boss width between adjacent slot is c, and P point place's Normal direction and air swirl angular separation are α on the notch.Embodiment 1,2,3,4,5 selects the different parameters value, obtains the good effect that engine performance improves through test, and makes comparisons with prior art, tabulates as follows:
Claims (4)
1, a kind of internal combustion engine that improves air utilization ratio, the top combuster, it is characterized in that the piston-top surface around the firing chamber is provided with the oblique gas guide groove that leads to the firing chamber, the eddy current sense of rotation that its true dip direction and air enter behind the cylinder adapts, groove depth (a) is 0.6～1mm, slot opening (b) is 2～16mm, and the boss width (c) between adjacent slot is 3～8mm.
2,, it is characterized in that the slot opening (b) of gas guide groove increases from inside to outside gradually by the described internal combustion engine of claim 1.
3, by the described internal combustion engine of claim 1, it is characterized in that gas guide groove is a helical, its trend is that the Normal direction of notch edges place any point (p) and the angle (α) of the interior eddy motion direction of cylinder are 0 °～90 °.
4, by the described internal combustion engine of claim 2, it is characterized in that groove depth (a) is 0.8mm, slot opening (b) is: the 5mm of burner port edge, the 15mm of outside piston place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03277848 CN2644689Y (en) | 2003-08-19 | 2003-08-19 | Internal combustion engine piston capable of improving air utilization ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03277848 CN2644689Y (en) | 2003-08-19 | 2003-08-19 | Internal combustion engine piston capable of improving air utilization ratio |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2644689Y true CN2644689Y (en) | 2004-09-29 |
Family
ID=34303033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03277848 Expired - Lifetime CN2644689Y (en) | 2003-08-19 | 2003-08-19 | Internal combustion engine piston capable of improving air utilization ratio |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2644689Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100392230C (en) * | 2003-08-19 | 2008-06-04 | 扬动股份有限公司 | IC engine piston for improving air availability |
| CN102287260A (en) * | 2011-05-09 | 2011-12-21 | 北京理工大学 | Double-swirl combustion system with swirls |
| CN107440647A (en) * | 2017-08-22 | 2017-12-08 | 李峥炜 | Dust-absorption mop |
| CN109854359A (en) * | 2018-10-30 | 2019-06-07 | 中国北方发动机研究所(天津) | A kind of eddy flow groove profile combustion chamber suitable for turbulence burning system |
-
2003
- 2003-08-19 CN CN 03277848 patent/CN2644689Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100392230C (en) * | 2003-08-19 | 2008-06-04 | 扬动股份有限公司 | IC engine piston for improving air availability |
| CN102287260A (en) * | 2011-05-09 | 2011-12-21 | 北京理工大学 | Double-swirl combustion system with swirls |
| CN107440647A (en) * | 2017-08-22 | 2017-12-08 | 李峥炜 | Dust-absorption mop |
| CN109854359A (en) * | 2018-10-30 | 2019-06-07 | 中国北方发动机研究所(天津) | A kind of eddy flow groove profile combustion chamber suitable for turbulence burning system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20080604 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |