CN206830321U - A kind of direct-injection gasoline engine piston - Google Patents
A kind of direct-injection gasoline engine piston Download PDFInfo
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- CN206830321U CN206830321U CN201720499174.6U CN201720499174U CN206830321U CN 206830321 U CN206830321 U CN 206830321U CN 201720499174 U CN201720499174 U CN 201720499174U CN 206830321 U CN206830321 U CN 206830321U
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- gasoline engine
- injection gasoline
- engine piston
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- 238000002347 injection Methods 0.000 title claims abstract description 24
- 239000007924 injection Substances 0.000 title claims abstract description 24
- 238000002485 combustion reaction Methods 0.000 claims abstract description 8
- 230000007704 transition Effects 0.000 claims description 5
- 230000002146 bilateral effect Effects 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000000295 fuel oil Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000008450 motivation Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Landscapes
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
A kind of direct-injection gasoline engine piston is the utility model is related to, its piston only is bilateral symmetry, and rear and front end is intake and exhaust squish area, and middle part is the sphere pit through front and rear squish area rounding off, and pit centres are in the underface of combustion chamber spark plug；Symmetrical bulge-structure centered on the left and right sides, the bulge-structure are made up of intake and exhaust valve pit, two lateral inclines, convex top plane and edge plane, top land structure entirety rounding off.The utility model is by changing the structure and shape of piston-top surface, effectively increase the internal combustion oil of cylinder uniformity, enhance tubulence energy size and reasonable layout at time of ignition spark plug, flame is set to form stable burning nucleus initial stage, improve the stability burnt under declared working condition, the generation of pinking is avoided, improves rated power.
Description
Technical field
The utility model belongs to piston of gasoline engine technical field, more particularly to a kind of high power, high tumble flow side direct-injection hair
Motivation piston.
Background technology
In-cylinder direct-jet supercharging gasoline engine (TGDI, Turbo-charged Gasoline Direct
Injection) coordinate Down-Sizing and Down-Speeding strategies that there is good dynamic property, economy and relative
Relatively low cost advantage (cost is compared with hybrid power, electric car, HCCI technologies), and correlation technique reaches its maturity, the amount of possessing
Production condition, turn into the main direction of development of petrol engine at present.To improve engine power rating to meet vehicle demand,
The technological means for suppressing pinking is generally used, such as：Improve air intake duct tumble flow characteristic, raising injection pressure and reasonably optimizing oil
Shu Fangxiang, improve Injection strategy, reasonably optimizing piston-top surface shape etc..Current supercharged direct-injection engine injection pressure is relatively
It is low（≤200bar）, to meet time of ignition fuel concentration demand, its piston crown is typically designed as air inlet side pit, and both sides have
Higher projection（≥6.5mm）Shape, the piston has the disadvantages that in high speed high load working condition：1st, because gas in the jar moves
Relatively strong, close to the compression top center moment, nearby tubulence energy is relatively low for spark plug, and more tubulence energy concentrates on air inlet side, causes flame
It is slower to propagate uneven and flame propagation velocity, is unfavorable for improving power；2nd, piston both sides cause to fire due to there is higher projection
Oily skewness, both sides fuel concentration is relatively low, and near wall temperature is higher, and the raised fast propagation for hindering flame in both sides, with
Upper factor easily causes the pinking at both sides position to be inclined to, and is unfavorable for further improving power.
Utility model content
The utility model devises a kind of direct-injection gasoline engine piston, which solves existing piston-shaped the shortcomings that existing and asks
Topic, targetedly optimization piston top shape, improves tubulence energy size and the conjunction near spark plug under the big load of high rotating speed
Reason distribution, and promote internal combustion oil of cylinder to be uniformly distributed, so as to reduce the pinking of engine tendency, improve rated power.
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 the piston only top nose is air inlet
Squish area, rear end are exhaust squish area, and left and right ends are symmetrically arranged bulge-structure, and middle part is to enter before and after rounding off connects
It is vented the sphere pit of squish area and left and right bulge-structure；The bulge-structure is followed successively by from front to back：Inlet valve valve pit, enter
Valve lateral incline, raised top surface, exhaust lateral incline and exhaust valve valve pit, and rounding off connects successively between each several part
Connect；The outside of the bulge-structure is by chamfered transition to edge plane.
Further, the sphere pit is located at the center at the top of the piston only, and sphere pit centres are in combustion chamber fire
Hua Sai underface.
Further, equal rounding off between each adjacent structure in the piston only top.
Further, the diameter ＞ 70mm of the piston only.
Further, the height of the raised top surface, i.e., height of the described raised top surface apart from the piston only top planes
Degree ,≤3.5mm.
Further, distance of the raised top surface apart from described piston only or so Central Symmetry face is 25 ± 2mm.
Further, the depth of the sphere pit and the height ratio of the raised top surface are between 0.35-0.5.
Further, the width of the edge plane radial direction has 2 ± 0.5mm.
Further, the piston is bilateral symmetry.
The direct-injection gasoline engine piston has the advantages that：
（1）The utility model changes the structure and shape of top land, and vapour internal combustion oil of cylinder mixture homogeneity is improved,
Especially the fuel concentration of cylinder both sides be improved significantly, bulk temperature is more uniform in cylinder；Improve time of ignition spark
Tubulence energy near plug, and make tubulence energy distribution relatively reasonable, easily formed during igniting and stablize fiery core and improve flame propagation speed
Degree, improve flame propagation uniformity；During flame propagation, the piston can reduce sensitivity of the piston bossing to flame propagation
Property, flame propagation velocity is not influenceed, greatly improves the anti-knock properties of engine, is advantageous to further improve rated power.
（2）The utility model can only be improved in the case where not changing cylinder cap model by changing piston crown shape
Fuel oil uniformity, tubulence energy at spark plug is improved, reduces the piston-shaped influence to flame propagation, pinking tendency is reduced with this,
Further improve rated power.It is simple in construction, cost is low, is easily achieved.
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；
Fig. 4：B-B sectional views in Fig. 2.
Description of reference numerals：
1-air inlet squish area；2-exhaust squish area；3-sphere pit；4-bulge-structure;41-inlet valve keeps away valve
Hole；42-inlet valve lateral incline；43-raised top surface；44-exhaust lateral incline;45-exhaust valve valve pit；46-side
Edge plane.
Embodiment
Below in conjunction with the accompanying drawings, the utility model is described further：
Fig. 1 to Fig. 4 shows a kind of direct-injection gasoline engine piston, including piston only, and piston only is bilateral symmetry,
Piston only top front portion is air inlet squish area 1, and there is exhaust squish area 2 at rear portion, and left and right is symmetrically arranged bulge-structure 4, in
Portion is the sphere pit 3 that rounding off connects intake and exhaust squish area and left and right bulge-structure 4.Bulge-structure 4 from front to back according to
It is secondary to be：Inlet valve valve pit 41, inlet valve lateral incline 42, raised top surface 43, exhaust lateral incline 44 and exhaust valve keep away valve
46 are cheated, transition arc transition and linkage is passed sequentially through between each several part.The outside of bulge-structure 4 is by chamfered transition to edge plane 46.
Top land structure entirety rounding off.
The diameter ＞ 70mm of piston only, the raised top surface 43 of the bulge-structure 4 of the left and right sides is apart from piston or so center
The distance of the plane of symmetry is 25 ± 2mm.The height of raised top surface 43, i.e., height of the raised top surface 43 apart from piston only top planes
Distance≤3.5mm.The depth of sphere pit 3 and the height proper ratio of raised top surface 43 are between 0.35-0.5, bulge-structure 4
The width of the radial direction of edge plane 46 in outside has 2 ± 0.5mm.Sphere pit 3 is located at the center at the top of piston only, pit centres
The underface of spark plug in combustion chamber.
The utility model changes top land structure and shape, after fuel oil sprays into cylinder, because piston both sides are convex
Play Partial Height and be less than 3.5mm, it is smaller to airflow influence, promote the fuel oil of both sides to mix, the raising internal combustion oil of cylinder uniformity, in cylinder
Bulk temperature is more uniform, reduces the pinking caused by mixing is uneven of cylinder both sides and is inclined to；In piston stroking upward compression stage, by
Piston centre is in piston crater, top land air-flow easily forms stronger compression rolling along piston-shaped in piston centre
Stream, the time of ignition tumble flow crush, and are formed about higher tubulence energy in spark plug and distribution is relatively reasonable, contribute to generation steady
Fixed fiery core, improve flame propagation velocity and improve flame propagation uniformity；In flame propagation mid-term, the bossing of piston both sides
Less than 3.5mm, the sensitiveness to flame propagation can be effectively reduced, flame is easier to travel to cylinder both sides, reduces engine
Pinking is inclined to, and is advantageous to further improve engine power.
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 squeezes for air inlet
Gas area, rear end are exhaust squish area, and left and right ends are symmetrically arranged bulge-structure, and middle part is to enter row before and after rounding off connects
The sphere pit of gas squish area and left and right bulge-structure；The bulge-structure is followed successively by from front to back：Inlet valve valve pit, air inlet
Door lateral incline, raised top surface, exhaust lateral incline and exhaust valve valve pit, and rounding off connects successively between each several part
Connect；The outside of the bulge-structure is by chamfered transition to edge plane.
2. direct-injection gasoline engine piston according to claim 1, it is characterised in that the sphere pit is located at the piston sheet
Center at the top of body, sphere pit centres are in the underface of combustion chamber spark plug.
3. direct-injection gasoline engine piston according to claim 1, it is characterised in that each adjacent structure at the top of the piston only
Between equal rounding off.
4. direct-injection gasoline engine piston according to claim 1, it is characterised in that the diameter ＞ 70mm of the piston only.
5. direct-injection gasoline engine piston according to any one of claims 1 to 4, it is characterised in that the height of the raised top surface,
I.e. described raised top surface is apart from the height of the piston only top planes ,≤3.5mm.
6. direct-injection gasoline engine piston according to claim 5, it is characterised in that the raised top surface is apart from the piston sheet
The distance in body or so Central Symmetry face is 25 ± 2mm.
7. direct-injection gasoline engine piston according to claim 5, it is characterised in that the depth of the sphere pit with it is described convex
The height ratio of top surface is played between 0.35-0.5.
8. according to the direct-injection gasoline engine piston described in claim 1,2,3,4,6 or 7, it is characterised in that the edge plane footpath
To width have 2 ± 0.5mm.
9. according to the direct-injection gasoline engine piston described in claim 1,2,3,4,6 or 7, it is characterised in that the piston is left and right
Symmetrical structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720499174.6U CN206830321U (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 |
|---|---|---|---|
| CN201720499174.6U CN206830321U (en) | 2017-05-08 | 2017-05-08 | A kind of direct-injection gasoline engine piston |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206830321U true CN206830321U (en) | 2018-01-02 |
Family
ID=60770463
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720499174.6U Active CN206830321U (en) | 2017-05-08 | 2017-05-08 | A kind of direct-injection gasoline engine piston |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110966113A (en) * | 2018-09-30 | 2020-04-07 | 上海汽车集团股份有限公司 | Gasoline engine and piston top structure thereof |
| CN112031948A (en) * | 2020-08-18 | 2020-12-04 | 清华大学 | Spark compression ignition type piston, combustion system, power assembly system and control method |
| CN113404615A (en) * | 2021-07-02 | 2021-09-17 | 天津内燃机研究所（天津摩托车技术中心） | Arc top piston top, arc top piston and combustion chamber |
-
2017
- 2017-05-08 CN CN201720499174.6U patent/CN206830321U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110966113A (en) * | 2018-09-30 | 2020-04-07 | 上海汽车集团股份有限公司 | Gasoline engine and piston top structure thereof |
| CN112031948A (en) * | 2020-08-18 | 2020-12-04 | 清华大学 | Spark compression ignition type piston, combustion system, power assembly system and control method |
| CN112031948B (en) * | 2020-08-18 | 2021-11-02 | 清华大学 | Spark compression ignition type piston, combustion system, power assembly system and control method |
| CN113404615A (en) * | 2021-07-02 | 2021-09-17 | 天津内燃机研究所（天津摩托车技术中心） | Arc top piston top, arc top piston and combustion chamber |
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