CN208474015U - The piston-top surface structure of soot in a kind of reduction cylinder of diesel engine - Google Patents
The piston-top surface structure of soot in a kind of reduction cylinder of diesel engine Download PDFInfo
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- CN208474015U CN208474015U CN201820683171.2U CN201820683171U CN208474015U CN 208474015 U CN208474015 U CN 208474015U CN 201820683171 U CN201820683171 U CN 201820683171U CN 208474015 U CN208474015 U CN 208474015U
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Abstract
The piston-top surface structure of soot in a kind of reduction cylinder of diesel engine, including combustion chamber outer piston top surface, it is characterized in that: soot oxidation annular groove is provided on the piston-top surface, the soot oxidation annular groove and combustion chamber are coaxial, and it is D that radial position, which is crossed to form diameter between combustion chamber highest point and piston-top surface,1Circle and piston-top surface diameter be D2Maximum outer circle between.The utility model has the beneficial effects that soot oxidation annular groove can increase the amount of fresh air of top land, the soot oxidation rate in the region is improved；More soots are allowed to complete oxidation in soot oxidation annular groove, to reduce the soot emissions amount in cylinder of diesel engine.Using the diesel engine with this top surface structure piston compared with the flat-head piston diesel engine of identical combustion chamber, soot emissions reduce 85.6% in cylinder.
Description
Technical field
The utility model patent belongs to diesel combustion field, especially, in particular to soot in a kind of reduction cylinder of diesel engine
Piston-top surface structure.
Background technique
The main pollutant effulent of diesel engine is soot and oxynitrides, and wherein the soot of diesel emission is considered as
One of the main reason for leading to haze weather exacerbation in recent years.In order to solve this problem state VI emission regulation is to diesel vehicle
Soot emissions have carried out very strict limit value.Come since state's VI technical solution all introduces exhaust gas recycling (EGR) technology mostly
Oxynitrides is reduced, side effect is that the soot emissions in cylinder is caused to further increase.In addition, being used in state's VI technical solution
Grain catcher (DPF) need fuel consumption to be regenerated, its bigger regeneration of soot emissions amount is more frequent in cylinder, vehicle
Oil consumption will be higher.Therefore, no matter from the aspect of discharge or oil consumption, it is necessary to the soot as far as possible in reduction cylinder of diesel engine
Discharge amount.The discharge amount of soot is determined by production quantity and amount of oxidation in cylinder of diesel engine, and wherein the oxidation of soot needs higher
Temperature and Oxygen Condition, this exacting terms make the soot in piston-top surface clearance be difficult to be oxidized, in particular with
The increase of fuel distribution amount outside combustion chamber, this part soot become the main source of soot emissions in cylinder, it is therefore desirable to emphatically
Reinforce the oxidation of piston-top surface soot to reduce the soot emissions amount in entire cylinder.
A kind of diesel engine steel piston of the low smoke intensity combustion chamber of band is disclosed in patent document CN202402157U, the piston is logical
It crosses the ω shape burning chamber shape to end face center and optimizes and achieve the purpose that reduce soot inside combustion recess, to pit
The soot improvement of outer piston top surface does not act on.A kind of reduction cylinder of diesel engine is disclosed in patent document 2CN105909420A
The combustion chamber of interior soot, the combustion chamber also increase at edge other than optimizing to end face center ω shape burning chamber shape
Annular guide face can prevent part gaseous mixture from being directly entered the cold and oxygen deficient region of close cylinder wall surface to a certain extent, from
And it plays a role to soot outside pit is reduced, but the patent can not thoroughly change the air-fuel mixture outside combustion recess
State.The invention patent proposes that a kind of piston-top surface structure for reducing soot in cylinder of diesel engine, the structure can increase combustion chamber
The amount of fresh air of pit perimeter, thoroughly solves the fuel oil oxygen deficit problem in the region, while it is close to prevent gaseous mixture from entering
The cold and oxygen deficient region of cylinder wall surface, which can be greatly reduced the Soot Formation amount outside combustion recess, to drop
Soot emissions amount in low entire cylinder.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of piston-top surfaces that can reduce soot in cylinder of diesel engine
Structure.The technological means of use is to design the soot oxidation rate improved in piston-top surface clearance by piston-top surface structure, from
And the soot in the region is reduced, realize the target for reducing soot in cylinder of diesel engine.
The utility model solves technical solution used by its technical problem:
The piston-top surface structure of soot in a kind of reduction cylinder of diesel engine, including combustion chamber outer piston top surface, it is characterized in that:
Soot oxidation annular groove is provided on the piston-top surface, the soot oxidation annular groove and combustion chamber are coaxial, radial position
Circle (the diameter D being crossed to form between combustion chamber highest point and piston-top surface1) and piston-top surface maximum outer circle (diameter D2) it
Between.
The further soot oxidation annular groove is made of aerial drainage slope, annular groove bottom and choked flow wall, the aerial drainage slope and work
Top surface is filled in into angle α, the choked flow wall and piston-top surface into angle β, and it is the one of piston-top surface that soot, which aoxidizes top surface on annular groove,
Part, the contour line on the aerial drainage slope, annular groove bottom and choked flow wall is connected is crossed to form soot oxidation annular groove with piston-top surface again
Chamfered shape.
The piston-top surface structure of soot is that one is dug on piston-top surface in a kind of further reduction cylinder of diesel engine
A cross sectional shape be inverted trapezoidal soot aoxidize annular groove, the inverted trapezoidal soot aoxidize annular groove two stringcourses, that is, aerial drainage slope and
The angle of choked flow wall and piston-top surface is respectively α1=30~70 °, β1=30~70 °, the distance of annular groove distance from bottom piston-top surface
H1For 2~10mm, soot aoxidizes annular groove and combustion chamber is coaxial, and top surface is a part of piston-top surface, radial direction thereon
Circle (the diameter D that position is crossed to form between combustion chamber highest point and piston-top surface1) (diameter is with piston-top surface maximum outer circle
D2) between, the contour line on the aerial drainage slope, annular groove bottom and choked flow wall is connected is crossed to form soot oxidation annular with piston-top surface again
The chamfered shape of slot.
The piston-top surface structure of soot is that one is dug on piston-top surface in a kind of further reduction cylinder of diesel engine
A cross sectional shape is that the soot of bilateral symmetry arc aoxidizes annular groove, which aoxidizes the aerial drainage slope of annular groove
Angle with piston-top surface is α2=30~70 °, the choked flow wall of soot oxidation annular groove and the angle of piston-top surface are β2=30~
70 °, annular groove bottom is connect with aerial drainage slope and choked flow wall three's rounding off, distance H of the annular groove bottom apart from piston-top surface2For 2~
10mm, soot aoxidizes annular groove and combustion chamber is coaxial, and top surface is a part of piston-top surface thereon, radial position between
Circle (the diameter D that combustion chamber highest point and piston-top surface are crossed to form1) and piston-top surface maximum outer circle (diameter D2) between,
The contour line on the aerial drainage slope, annular groove bottom and choked flow wall is connected is crossed to form the profile of soot oxidation annular groove with piston-top surface again
Shape.
The piston-top surface structure of soot is that one is dug on piston-top surface in a kind of further reduction cylinder of diesel engine
A cross sectional shape is that the soot of left shallow right deep asymmetric arc aoxidizes annular groove, and the shallow right deep asymmetric arc soot in the left side aoxidizes ring
The aerial drainage slope of shape slot and the angle of piston-top surface are α3=10~40 °, the choked flow wall and piston-top surface of soot oxidation annular groove
Angle is β3=60~90 °, annular groove bottom is connect with aerial drainage slope and choked flow wall three's rounding off, and annular groove bottom is apart from piston-top surface
Distance H3For 2~10mm, soot aoxidizes annular groove and combustion chamber is coaxial, and top surface is a part of piston-top surface thereon,
Circle (the diameter D that its radial position is crossed to form between combustion chamber highest point and piston-top surface1) and piston-top surface maximum outer circle
(diameter D2) between, the contour line on the aerial drainage slope, annular groove bottom and choked flow wall, which is connected, is crossed to form soot with piston-top surface again
Aoxidize the chamfered shape of annular groove.
The piston-top surface structure of soot is that one is dug on piston-top surface in a kind of further reduction cylinder of diesel engine
A cross sectional shape is that the soot of left deep right shallow asymmetric arc aoxidizes annular groove, which aoxidizes ring
The aerial drainage slope of shape slot and the angle of piston-top surface are α4=60~90 °, the choked flow wall and piston-top surface of soot oxidation annular groove
Angle β4=10~40 °, annular groove bottom is connect with aerial drainage slope and choked flow wall three's rounding off, annular groove distance from bottom piston-top surface
Distance H4For 2~10mm, soot aoxidizes annular groove and combustion chamber is coaxial, and top surface is a part of piston-top surface thereon,
Circle (the diameter D that radial position is crossed to form between combustion chamber highest point and piston-top surface1) (straight with piston-top surface maximum outer circle
Diameter is D2) between, the contour line on the aerial drainage slope, annular groove bottom and choked flow wall is connected is crossed to form soot oxidation with piston-top surface again
The chamfered shape of annular groove.
The beneficial effects of the utility model are: on the one hand the soot oxidation annular groove in this top land structure can increase
Add the amount of fresh air of top land, and guide fuel oil to enter the region by aerial drainage slope, to improve in piston-top surface clearance
Fuel oil and oxygen contact probability, improve air-fuel mixture state, improve the soot oxidation rate in the region；Another aspect soot
The choked flow wall of oxidation annular groove can hinder fuel oil further to move in terms of cylinder wall surface, so that more soot be avoided to enter oxygen
Change the low-down cold and oxygen deficient region of rate, allows more soots to complete oxidation in soot oxidation annular groove, to reduce bavin
Soot emissions amount in oil machine cylinder.Numerical result shows to adopt under oil consumption and oxynitride discharge all unanimous circumstances
With the diesel engine with this top surface structure piston compared with the flat-head piston diesel engine of identical combustion chamber, soot emissions are reduced in cylinder
85.6%.
Detailed description of the invention
Fig. 1 is the utility model piston-top surface structural schematic diagram；
Fig. 2 is soot oxidation annular slot cross-section partial enlarged view of the utility model middle section in reverse trapezoid shape；
Fig. 3 is that the soot of the symmetrical arc shape in the utility model middle section aoxidizes annular slot cross-section partial enlarged view；
Fig. 4 aoxidizes annular slot cross-section in the soot of left shallow right deep asymmetry arc shape for the utility model middle section and locally puts
Big figure；
Fig. 5 aoxidizes annular slot cross-section in the soot of left deep right shallow asymmetry arc shape for the utility model middle section and locally puts
Big figure.
Specific embodiment
In order to make the technical problems, technical solutions and advantages to be solved by the utility model clearer, below in conjunction with attached drawing
And specific embodiment is described in detail.
First in conjunction with the work for reducing soot in cylinder of diesel engine a kind of to embodiment provided by the utility model of attached drawing 1 to Fig. 5
Plug top surface structure is introduced.
The piston-top surface structure of soot in a kind of reduction cylinder of diesel engine, including 1 outer piston top surface of combustion chamber, feature
Are as follows: soot oxidation annular groove 3 is provided on the piston-top surface 2, the soot oxidation annular groove 3 and combustion chamber 1 are coaxial, diameter
Being crossed to form diameter between 1 highest point of combustion chamber and piston-top surface 2 to position is D1Circle and 2 diameter of piston-top surface be D2Most
Between large cylindrical.
The soot oxidation annular groove 3 is made of aerial drainage slope 4, annular groove bottom 5 and choked flow wall 6, the aerial drainage slope 4 and piston top
Face 2 is at angle α, and for the choked flow wall 6 with piston-top surface 2 at angle β, it is piston-top surface 2 that soot, which aoxidizes top surface on annular groove 3,
A part, the annular groove bottom 5 are connect with aerial drainage slope 4 and 6 three's rounding off of choked flow wall, the aerial drainage slope 4, annular groove bottom 5 and resistance
The contour line of stream wall 6 is connected is crossed to form the chamfered shape of soot oxidation annular groove 3 with piston-top surface 2 again.
Embodiment 1
As depicted in figs. 1 and 2, a kind of piston-top surface structure for reducing soot in cylinder of diesel engine of the utility model is in piston
The soot that a cross sectional shape is inverted trapezoidal is dug on top surface 2 and aoxidizes annular groove 3, which aoxidizes two of annular groove 3
The angle of stringcourse, that is, aerial drainage slope 4 and choked flow wall 6 and piston-top surface 2 is respectively α1=30~70 °, β1=30~70, annular groove bottom 5 with
Aerial drainage slope 4 is connected with 6 three's rounding off of choked flow wall, distance H of the annular groove bottom 5 apart from piston-top surface 21For 2~10mm, soot
It aoxidizes annular groove 3 and combustion chamber 1 is coaxial, and top surface is a part of piston-top surface 2 thereon, radial position is between combustion chamber
Circle (the diameter D that 1 highest point and piston-top surface 2 are crossed to form1) and maximum outer circle (the diameter D of piston-top surface 22) between, institute
The contour line for stating aerial drainage slope 4, annular groove bottom 5 and choked flow wall 6 is connected is crossed to form soot oxidation annular groove 3 with piston-top surface 2 again
Chamfered shape.
Embodiment 2
As shown in figures 1 and 3, a kind of piston-top surface structure for reducing soot in cylinder of diesel engine of the utility model is in piston
The soot that a cross sectional shape is bilateral symmetry arc is dug on top surface 2 aoxidizes annular groove 3, bilateral symmetry arc soot oxidation
The aerial drainage slope 4 of annular groove 3 and the angle of piston-top surface 2 are α2=30~70 °, the choked flow wall 6 of soot oxidation annular groove 3 and work
The angle for filling in top surface 2 is β2=30~70 °, annular groove bottom 5 is connect with aerial drainage slope 4 and 6 three's rounding off of choked flow wall, annular groove bottom 5
Distance H apart from piston-top surface 22For 2~10mm, soot aoxidizes annular groove 3 and combustion chamber 1 is coaxial, and top surface is living thereon
Fill in a part of top surface 2, circle (the diameter D that radial position is crossed to form between 1 highest point of combustion chamber and piston-top surface 21)
With maximum outer circle (the diameter D of piston-top surface 22) between, the aerial drainage slope 4, annular groove bottom 5 are connected again with the contour line of choked flow wall 6
The chamfered shape of soot oxidation annular groove 3 is crossed to form with piston-top surface 2.
Embodiment 3
As shown in Figure 1 and Figure 4, a kind of piston-top surface structure for reducing soot in cylinder of diesel engine of the utility model is in piston
The soot that a cross sectional shape is left shallow right deep asymmetric arc is dug on top surface 2 and aoxidizes annular groove 3, and the left side is shallow right deep asymmetric
It is α that arc soot, which aoxidizes the aerial drainage slope 4 of annular groove 3 and the angle of piston-top surface 2,3=10~40 °, soot oxidation annular groove 3
The angle of choked flow wall 6 and piston-top surface 2 is β3=60~90 °, annular groove bottom 5 and 6 three's rounding off of aerial drainage slope 4 and choked flow wall
Connection, distance H of the annular groove bottom 5 apart from piston-top surface 23For 2~10mm, soot aoxidizes annular groove 3 and combustion chamber 1 is coaxial, and
Top surface is a part of piston-top surface 2 thereon, and radial position is crossed to form between 1 highest point of combustion chamber and piston-top surface 2
Circle (diameter D1) and maximum outer circle (the diameter D of piston-top surface 22) between, the aerial drainage slope 4, annular groove bottom 5 and choked flow wall 6 wheel
Profile is connected is crossed to form the chamfered shape of soot oxidation annular groove 3 with piston-top surface 2 again.
Embodiment 4
As shown in Figure 1 and Figure 5, a kind of piston-top surface structure for reducing soot in cylinder of diesel engine of the utility model is in piston
The soot that a cross sectional shape is left deep right shallow asymmetric arc is dug on top surface aoxidizes annular groove 3, the left deep right shallow asymmetric arc
It is α that shape soot, which aoxidizes the aerial drainage slope 4 of annular groove 3 and the angle of piston-top surface 2,4=60~90 °, soot oxidation annular groove 3 resistance
Flow the angle β of wall 6 and piston-top surface 24=10~40 °, annular groove bottom 5 is connect with aerial drainage slope 4 and 6 three's rounding off of choked flow wall,
Distance H of the annular groove bottom 5 apart from piston-top surface 24For 2~10mm, soot aoxidizes annular groove 3 and combustion chamber 1 is coaxial, and thereon
Top surface is a part of piston-top surface 2, and the circle that radial position is crossed to form between 1 highest point of combustion chamber and piston-top surface 2 is (straight
Diameter is D1) and maximum outer circle (the diameter D of piston-top surface 22) between, the aerial drainage slope 4, annular groove bottom 5 and choked flow wall 6 contour line
It is connected and is crossed to form the chamfered shape of soot oxidation annular groove 3 with piston-top surface again.
The combustion chamber 1 that 2 structure of piston-top surface is arranged in pairs or groups described in above embodiments include but are not limited to bowl-in-piston chamber,
ω shape combustion chamber, bathtub shaped combustion chamber.
Claims (6)
1. a kind of piston-top surface structure for reducing soot in cylinder of diesel engine, including combustion chamber (1) external piston-top surface, feature
Are as follows: soot oxidation annular groove (3), soot oxidation annular groove (3) and combustion chamber (1) are provided on the piston-top surface (2)
Coaxially, radial position is D between the diameter that combustion chamber (1) highest point and piston-top surface (2) are crossed to form1Round and piston-top surface
(2) diameter is D2Maximum outer circle between.
2. a kind of piston-top surface structure for reducing soot in cylinder of diesel engine according to claim 1, it is characterized in that: the carbon
Cigarette oxidation annular groove (3) is made of aerial drainage slope (4), annular groove bottom (5) and choked flow wall (6), the aerial drainage slope (4) and piston-top surface
(2) at angle α, at angle β, it is piston top that soot, which aoxidizes top surface on annular groove (3), for the choked flow wall (6) and piston-top surface (2)
The a part in face (2), the annular groove bottom (5) connect with aerial drainage slope (4) and choked flow wall (6) three's rounding off, the aerial drainage slope
(4), the contour line of annular groove bottom (5) and choked flow wall (6) is connected is crossed to form soot oxidation annular groove (3) with piston-top surface (2) again
Chamfered shape.
3. according to claim 1 or a kind of piston-top surface structure for reducing soot in cylinder of diesel engine as claimed in claim 2, special
Sign are as follows: soot oxidation annular groove (3) cross sectional shape is inverted trapezoidal, which aoxidizes two of annular groove (3)
Stringcourse, that is, aerial drainage slope (4) and choked flow wall (6) and the angle of piston-top surface (2) are respectively α1=30~70o, β1=30~70o, ring
Slot bottom (5) is connect with aerial drainage slope (4) and choked flow wall (6) three's rounding off, the distance of annular groove bottom (5) apart from piston-top surface (2)
H1For 2~10mm.
4. according to claim 1 or a kind of piston-top surface structure for reducing soot in cylinder of diesel engine as claimed in claim 2, special
Sign are as follows: soot oxidation annular groove (3) cross sectional shape is bilateral symmetry arc, which aoxidizes ring
The aerial drainage slope (4) of shape slot (3) and the angle of piston-top surface (2) are α2=30~70 °, soot oxidation annular groove (3) choked flow wall
It (6) is β with the angle of piston-top surface (2)2=30~70 °, annular groove bottom (5) and aerial drainage slope (4) and the round and smooth mistake of choked flow wall (6) three
Cross connection, the distance H of annular groove bottom (5) apart from piston-top surface (2)2For 2~10mm.
5. according to claim 1 or a kind of piston-top surface structure for reducing soot in cylinder of diesel engine as claimed in claim 2, special
Sign are as follows: soot oxidation annular groove (3) cross sectional shape is the left shallow right asymmetric arc of depth, the shallow right deep asymmetric arc in the left side
It is α that shape soot, which aoxidizes the aerial drainage slope (4) of annular groove (3) and the angle of piston-top surface (2),3=10~40 °, soot oxidation annular groove
(3) angle of choked flow wall (6) and piston-top surface (2) is β3=60~90 °, annular groove bottom (5) and aerial drainage slope (4) and choked flow wall
(6) three's rounding off connects, the distance H of annular groove bottom (5) apart from piston-top surface (2)3For 2~10mm.
6. according to claim 1 or a kind of piston-top surface structure for reducing soot in cylinder of diesel engine as claimed in claim 2, special
Sign are as follows: soot oxidation annular groove (3) cross sectional shape is left deep right shallow asymmetric arc, the left deep right shallow asymmetric arc
It is α that shape soot, which aoxidizes the aerial drainage slope (4) of annular groove (3) and the angle of piston-top surface (2),4=60~90 °, soot oxidation annular groove
(3) the angle β of choked flow wall (6) and piston-top surface (2)4=10~40 °, annular groove bottom (5) and aerial drainage slope (4) and choked flow wall (6)
The connection of three's rounding off, the distance H of annular groove bottom (5) apart from piston-top surface (2)4For 2~10mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820683171.2U CN208474015U (en) | 2018-05-09 | 2018-05-09 | The piston-top surface structure of soot in a kind of reduction cylinder of diesel engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820683171.2U CN208474015U (en) | 2018-05-09 | 2018-05-09 | The piston-top surface structure of soot in a kind of reduction cylinder of diesel engine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108678870A (en) * | 2018-05-09 | 2018-10-19 | 中国第汽车股份有限公司 | The piston-top surface structure of soot in a kind of reduction cylinder of diesel engine |
| CN114514366A (en) * | 2019-09-27 | 2022-05-17 | 梅赛德斯-奔驰集团股份公司 | Reciprocating piston engine for a motor vehicle and piston for a reciprocating piston engine |
-
2018
- 2018-05-09 CN CN201820683171.2U patent/CN208474015U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108678870A (en) * | 2018-05-09 | 2018-10-19 | 中国第汽车股份有限公司 | The piston-top surface structure of soot in a kind of reduction cylinder of diesel engine |
| CN114514366A (en) * | 2019-09-27 | 2022-05-17 | 梅赛德斯-奔驰集团股份公司 | Reciprocating piston engine for a motor vehicle and piston for a reciprocating piston engine |
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