CN206830320U - A kind of direct injection gasoline engine piston - Google Patents
A kind of direct injection gasoline engine piston Download PDFInfo
- Publication number
- CN206830320U CN206830320U CN201720499167.6U CN201720499167U CN206830320U CN 206830320 U CN206830320 U CN 206830320U CN 201720499167 U CN201720499167 U CN 201720499167U CN 206830320 U CN206830320 U CN 206830320U
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- piston
- pit
- gasoline engine
- direct injection
- exhaust
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- 239000003502 gasoline Substances 0.000 title claims abstract description 23
- 238000002347 injection Methods 0.000 title claims abstract description 19
- 239000007924 injection Substances 0.000 title claims abstract description 19
- 230000003247 decreasing effect Effects 0.000 claims abstract description 5
- 230000002146 bilateral effect Effects 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 2
- 239000000446 fuel Substances 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract 1
- 238000002485 combustion reaction Methods 0.000 description 10
- 239000007921 spray Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000008246 gaseous mixture Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 210000000867 larynx Anatomy 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 241001270131 Agaricus moelleri Species 0.000 description 1
- 210000000481 breast Anatomy 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000008450 motivation Effects 0.000 description 1
- 230000001869 rapid Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Landscapes
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
It the utility model is related to a kind of direct injection gasoline engine piston, including piston only, it is characterized in that, the piston only top nose is air inlet squish area, rear end is exhaust squish area, left and right ends are symmetrically arranged top surface plane, and middle part is the pit of squish area and the rounding off of left and right top surface plane before and after connection；The depth of the pit is successively decreased from exhaust side to air inlet side.The top surface plane is made up of intake and exhaust valve pit, two lateral inclines, top planes and edge plane, top land structure entirety rounding off.The structure and shape of the utility model piston-top surface, lift the maintenance ability for tumble flow, squish ability, tubulence energy at time of ignition spark plug can be effectively increased, flame is formed stable burning nucleus initial stage, improve the stability and burning velocity of burning, improve fuel economy.
Description
Technical field
The utility model belongs to technical field of engines, relates in particular to piston of gasoline engine, more particularly to one kind
Direct injection gasoline engine piston.
Background technology
The combustion chamber of general internal combustion engine refers to piston in top dead centre at present, fuel in the space that cylinder interior is burnt,
Combustion chamber is collectively constituted by piston-top surface, cylinder wall and cylinder cover.The top surface of piston of gasoline engine is generally flat-top, and surface to volume ratio is low,
The thermic load and stress concentration of piston group can be mitigated.It is straight in cylinder now with high efficiency, the needs of low oil consumption engine development
Spray technique is widely used.Direct spray petrol engine in cylinder can effectively reduce the temperature of combustion chamber, reduce discharge, reduce it is quick-fried
Shake trend.Direct spray petrol engine in cylinder is due to the needs of mixed Daqu, and the top structure of piston is often to be prominent around middle pit
The bowl-type risen, this kind of structure coordinates with cylinder wall and cylinder cover makes fuel gas form more preferable combustion swirl, to improve burning
Efficiency.The top land shape of direct spray petrol engine in cylinder is usually directed at present has pit, surrounding to have the structure of projection for centre, recessed
It is usually the horizontal plane parallel with the top surface of piston to cheat bottom surface.Pit bottom surface is horizontal, is unfavorable for the formation of gaseous mixture, causes
Efficiency of combustion declines.Therefore, it is necessary to make further Optimal improvements to the top structure of existing direct spray petrol engine in cylinder piston.
Utility model content
The utility model devises a kind of direct injection gasoline engine piston, which solves gasoline hair of the prior art
Motivation piston-top surface structure is unfavorable for the formation of gaseous mixture, the problem of causing efficiency of combustion to decline.Improve the dimension for tumble flow
Ability is held, squish ability, tubulence energy at time of ignition spark plug can be effectively increased, flame is formed stable burning nucleus initial stage,
The stability and burning velocity of burning are improved, improves fuel economy.
In order to solve above-mentioned technical problem, the utility model employs following scheme：
A kind of direct injection gasoline engine piston, including piston only, it is characterised in that before at the top of the piston only
End is air inlet squish area, and rear end is exhaust squish area, and left and right ends are symmetrically arranged top plane, and middle part connects for rounding off
The pit of front and rear squish area and left and right top plane；The depth of the pit is successively decreased from exhaust side to air inlet side.
Further, exhaust side casing wall distance is 7.5 ± 0.5mm described in the Edge Distance of the pit exhaust side, the edge
With piston-top surface the pit bottom is extended in 45-50 ° of gradient is round and smooth；The crater wall of the pit air inlet side and exhaust side cylinder
Wall distance is 16.5 ± 0.5mm, is that the arc surface is round and smooth to extend to institute in 65-70 ° of angled transition arc surface with piston-top surface
State pit bottom.
Further, the larynx mouth diameters of the pit are more than its basal diameter.
Further, the left and right edges of the pit are connected by curved surface rounding off with corresponding top plane respectively.
Further, the structure of the top plane is followed successively by from front to back：Air inlet side plane, inlet valve valve pit, inlet valve
Lateral incline, side top surface, exhaust lateral incline, exhaust valve valve pit and exhaust side plane.
Further, the inlet valve valve pit is connected by inlet valve inclined-plane with the air inlet squish area rounding off；Institute
Exhaust valve valve pit is stated to connect with the exhaust squish area rounding off by exhaust valve inclined-plane.
Further, equal rounding off between each adjacent structure in the piston only top.
Further, the piston is bilateral symmetry.
Further, the piston only includes piston only top, piston crown and piston group portion.
The direct injection gasoline engine piston has the advantages that：
The utility model changes top land structure and shape, because piston-top surface pit has from exhaust side to air inlet
The setting that side depth is successively decreased, and its most deep position is more beneficial for entering in engine induction stroke air-flow closer to exhaust side
Enter piston-top surface pit, by distinctive pit shape to strengthening the guiding to air-flow, advantageously ensure that the holding in cylinder is stronger
Tumble flow characteristic, and in engine compresses stroke, due to the setting of piston-top surface special shape pit, can further protect
There is stronger tubulence energy in card, so as to stable burning, lift burning velocity, reduce near around spark plug
Cycle of engine COV, improve efficiency of combustion.
Brief description of the drawings
Fig. 1：The structural representation of the utility model direct injection gasoline engine piston；
Fig. 2：The top view of the utility model direct injection gasoline engine piston；
Fig. 3：A-A sectional views in Fig. 2.
Description of reference numerals：
1-air inlet squish area；2-exhaust squish area；3-pit；4-top plane；5-air inlet valve pit；51-air inlet
Door inclined plane；6-exhaust valve valve pit；61-exhaust valve inclined-plane.
Embodiment
Below in conjunction with the accompanying drawings, the utility model is described further：
Fig. 1 to Fig. 3 shows a kind of direct injection gasoline engine piston, includes the piston only of bilateral symmetry,
Piston only is made up of top land, piston crown and piston group portion.Top land front end is air inlet squish area 1, and rear end is row
Gas squish area 2, left and right ends are symmetrically arranged top plane 4, and middle part is that squish area and left and right top are flat before and after rounding off connects
The depth in face has the pit 3 of graded, and the depth of pit 3 is successively decreased from exhaust side to air inlet side, and the bosom of pit 3 is set
In nearly exhaust side, most shallow place is arranged at nearly air inlet side.
Edge Distance exhaust side casing wall distance about 7.5 ± 0.5mm of the exhaust side of pit 3, the edge is in 45-50 ° of gradient
Pit bottom is extended to, the larynx mouth diameters of the pit are more than basal diameter；The nearly air inlet side pit edge of pit 3 and exhaust side cylinder
Wall distance is 16.5 ± 0.5mm, and it is in 65-70 ° of inclination angle that it, which connects inclined-plane with piston-top surface,.Piston-top surface is not provided with matching compression
The projection of ratio, left and right are symmetrical top plane 4, and the structure of top plane 4 is followed successively by from front to back：Air inlet side plane, inlet valve are kept away
Valve hole 5, inlet valve lateral incline, side top surface, exhaust lateral incline and exhaust valve valve pit 6, are vented side plane.Piston top
Portion's structure entirety rounding off.
The utility model, in order to coordinate the spray characteristics of high tumble flow air flue and directly jetting gasoline engine, piston-top surface it is gradual
Change in depth pit 3 is arranged at piston-top surface, and pit bottom surface Shen positions are in nearly exhaust side, and its pit edge is apart from exhaust side
7.5 ± 0.5mm positions, it is such a be designed with beneficial to guiding in-cylinder tumble flow smoothly enter piston-top surface guide, the pit edge with it is recessed
Cheat the smooth circular arc connection of underrun, the smooth arc-shaped surface and the inclination angle that piston-top surface is in 45-50 °；The piston crater 3 is deep
Degree, which tapers off, extends to air inlet side, and pit 3 is coupled close to air inlet side position with pit edge by smooth circular arc, its circular arc table
Face contributes to in-cylinder tumble flow retentivity, is advantageous to air-flow smoothly from piston with the inclination angle that piston-top surface is in 65-70 °, the setting
Top surface enters air inlet side wall；The left and right edges of pit 3 respectively by surface blending directly with corresponding inlet valve valve pit
5th, exhaust valve valve pit 6 connects with top plane 4；Inlet valve valve pit 5 is connected by inlet valve inclined-plane 51 with air inlet squish area 1；
Exhaust valve valve pit 6 is connected by exhaust valve valve inclined-plane 61 with exhaust squish area 2；Air inlet squish area 1 and exhaust squish area 2 exist
Piston compression stroke reaches near top dead center and plays very strong squish effect, the tubulence energy converted near time of ignition spark plug
Increase, so as to stable burning, cycle of engine COV is reduced, improves efficiency of combustion.
The structure and shape of the utility model piston-top surface, coordinate the air flue of high tumble flow, more ensure the rapids around spark plug
Kinetic energy, be advantageous to the formation of gaseous mixture, lift burning velocity, improve efficiency of combustion.
Exemplary description has been carried out to the utility model above in conjunction with accompanying drawing, it is clear that it is of the present utility model realization not by
The limitation of aforesaid way, if the various improvement that methodology and technical scheme of the present utility model are carried out are employed, or without
Improve and design of the present utility model and technical scheme are directly applied into other occasions, in the scope of protection of the utility model
It is interior.
Claims (9)
1. a kind of direct injection gasoline engine piston, including piston only, it is characterised in that the piston only top nose
It is air inlet squish area, rear end is exhaust squish area, and left and right ends are symmetrically arranged top plane, and middle part is before rounding off connects
Squish area and the pit of left and right top plane afterwards；The depth of the pit is successively decreased from exhaust side to air inlet side.
2. direct injection gasoline engine piston according to claim 1, it is characterised in that the side of the pit exhaust side
Edge be 7.5 ± 0.5mm apart from exhaust side casing wall distance, and the edge and piston-top surface, which are in that 45-50 ° of gradient is round and smooth, to be extended to
The pit bottom；The crater wall of the pit air inlet side is 16.5 ± 0.5mm with exhaust side casing wall distance, is to be in piston-top surface
65-70 ° of angled transition arc surface, the arc surface is round and smooth to extend to the pit bottom.
3. direct injection gasoline engine piston according to claim 1 or 2, it is characterised in that the aditus laryngis of the pit
Portion's diameter is more than its basal diameter.
4. direct injection gasoline engine piston according to claim 3, it is characterised in that the left and right edges of the pit
Connected respectively by curved surface rounding off with corresponding top plane.
5. according to the direct injection gasoline engine piston described in claim 1,2 or 4, it is characterised in that the top plane
Structure is followed successively by from front to back：Air inlet side plane, inlet valve valve pit, inlet valve lateral incline, side top surface, exhaust side tilt
Face, exhaust valve valve pit and exhaust side plane.
6. direct injection gasoline engine piston according to claim 5, it is characterised in that the inlet valve valve pit leads to
Inlet valve inclined-plane is crossed to connect with the air inlet squish area rounding off；The exhaust valve valve pit by exhaust valve inclined-plane with it is described
It is vented the connection of squish area rounding off.
7. according to the direct injection gasoline engine piston described in claim 1,2,4 or 6, it is characterised in that the piston sheet
Equal rounding off between each adjacent structure at the top of body.
8. according to the direct injection gasoline engine piston described in claim 1,2,4 or 6, it is characterised in that the piston is
Bilateral symmetry.
9. according to the direct injection gasoline engine piston described in claim 1,2,4 or 6, it is characterised in that the piston sheet
Body includes piston only top, piston crown and piston group portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720499167.6U CN206830320U (en) | 2017-05-08 | 2017-05-08 | A kind of direct injection gasoline engine piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720499167.6U CN206830320U (en) | 2017-05-08 | 2017-05-08 | A kind of direct injection gasoline engine piston |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206830320U true CN206830320U (en) | 2018-01-02 |
Family
ID=60770455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720499167.6U Active CN206830320U (en) | 2017-05-08 | 2017-05-08 | A kind of direct injection gasoline engine piston |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206830320U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112502848A (en) * | 2020-12-01 | 2021-03-16 | 东风汽车集团有限公司 | Piston for igniting compression ignition gasoline engine |
-
2017
- 2017-05-08 CN CN201720499167.6U patent/CN206830320U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112502848A (en) * | 2020-12-01 | 2021-03-16 | 东风汽车集团有限公司 | Piston for igniting compression ignition gasoline engine |
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