CN108518287A - Piston and engine assembly - Google Patents
Piston and engine assembly Download PDFInfo
- Publication number
- CN108518287A CN108518287A CN201810269844.4A CN201810269844A CN108518287A CN 108518287 A CN108518287 A CN 108518287A CN 201810269844 A CN201810269844 A CN 201810269844A CN 108518287 A CN108518287 A CN 108518287A
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- Prior art keywords
- conical surface
- circular conical
- piston
- pit
- angle
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- 238000002485 combustion reaction Methods 0.000 claims abstract description 35
- 230000001154 acute effect Effects 0.000 claims description 5
- 230000007704 transition Effects 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
- 239000000446 fuel Substances 0.000 description 8
- 239000004071 soot Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000009313 farming Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/26—Pistons having combustion chamber in piston head
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
A kind of piston of present invention offer and engine assembly.The piston includes combustion chamber (1), combustion chamber (1) includes the top surface (2) set gradually from side to centre, the first circular conical surface (3), the second circular conical surface (4) and pit (5), second circular conical surface (4) is extended out from the opening of pit (5), first circular conical surface (3) is extended out from opening of the second circular conical surface (4) far from pit (5), and the oblique angle of the first circular conical surface (3) is less than the oblique angle of the second circular conical surface (4).Piston according to the present invention can reduce narrow slit effect, reduce engine emission, reduce thermal loss, promote engine efficiency.
Description
Technical field
The invention belongs to technical field of engines, and in particular to a kind of piston and engine assembly.
Background technology
Engine includes body, cylinder cap, combustion chamber, piston etc..Piston is the core element of engine, and burning is happened at work
In the combustion chamber of plug, the explosion pressure for generation of burning pushes piston to do linear reciprocating motion along cylinder holes axial direction.When piston position
When top dead centre, the space formed by cylinder head, cylinder block and top land is known as combustion chamber.The shape of combustion chamber has become
An important factor for influencing diesel engine performance.It is well known that needing that unnecessary heat is avoided to damage as possible during engine acting
It loses, in combustion, indoor temperature of burning is apparently higher than piston and cylinder cap, and heat can be transmitted to cylinder cap and piston, cause
Thermal loss reduces the Effective power of burning, and how to reduce this unnecessary thermal loss becomes the pass for improving engine efficiency
Key technology.Meanwhile the design of the design of piston, especially chamber structure and firepower bank shape, to increasingly stringent diesel engine
Emission request suffers from important influence.
Existing DI diesel engine piston combustion bowl mostly uses toroidal combustion chamber, and pit is mostly by circular-shaped, concave cavity, tiltedly
The platform composition of the protrusion on the conical surface and top, the throat site of combustion chamber are designed as squish flow formula more, also have part to be designed as direct current
Formula.Prior art piston firepower bank height is larger, and piston whole height is higher.
Burning instantaneously generates higher temperature, and a portion heat is directly passed to piston and cylinder cap, causes heat loss,
Meanwhile piston-top surface temperature being made to increase, increase the thermic load of piston.Prior art, burning mixture is in cylinder, especially
It is the zonule and throat site between piston upper surface and cylinder cap, can form stronger turbulent flow, one side of this turbulent flow
Face promote fuel oil atomization, evaporation, but then wedge angle flow-disturbing can cause herein conductive heat flow density it is larger, increase biography
Hot coefficient, make cylinder cover bottom surface and piston-top surface bears larger thermic load.Meanwhile higher firepower bank design, to particle (this
In refer mainly to soot) and the discharge of HC have undesirable influence.
Invention content
Therefore, the technical problem to be solved in the present invention is to provide a kind of piston and engine assembly, can reduce slit
Effect reduces engine emission, reduces thermal loss, promotes engine efficiency.
To solve the above-mentioned problems, the present invention provides a kind of piston, including combustion chamber, and combustion chamber includes from side to centre
Top surface, the first circular conical surface, the second circular conical surface and the pit set gradually, the second circular conical surface are extended out from the opening of pit, and first
Circular conical surface is extended out from opening of second circular conical surface far from pit, and the oblique angle of the first circular conical surface is less than the oblique angle of the second circular conical surface.
Preferably, in the section by the central axis of piston, the angle α between the first circular conical surface and top surface is 70 °
To 80 °；And/or the second angle β between circular conical surface and top surface is 10 ° to 20 °.
Preferably, between top surface and the first circular conical surface, and/or between the first circular conical surface and the second circular conical surface, and/or second
It is connected by arc surface transition between circular conical surface and pit.
Preferably, pit includes the arc groove being connected and intermediate projections, and arc groove is connected with the second circular conical surface, in
Between protrusion be located at pit center.
Preferably, intermediate projections are tapered protrusion or arc convex.
Preferably, in the section by the central axis of piston, tangent line of the pit close to the second circular conical surface one side edge
The distance between central axis with the intersection point of the busbar extended line of the second circular conical surface relative to piston is R1, the second circular conical surface
The distance between the central axis of busbar extended line and the intersection point of top surface relative to piston is R2, the firepower off coast disc of piston
The distance between the central axis of the intersection point of extended line and the extended line of top surface relative to piston is R3, wherein R1 is R3
60%-80%, R2 are the 85%-97% of R3.
Preferably, in the section by the central axis of piston, the peak of intermediate projections is P1, and pit is close to second
The intersection point of the busbar extended line of the tangent line of circular conical surface one side edge and the second circular conical surface is P2, the busbar of the first circular conical surface and top surface
Intersection point be P3, wherein the height of P1 be higher than P2 height, be less than P3 height.
Preferably, in the section by the central axis of piston, tangent line of the pit close to the second circular conical surface one side edge
It is acute angle or obtuse angle to be formed by angle with the busbar extended line of the second circular conical surface.
Preferably, the angle β between the second circular conical surface and top surface is 15 °.
According to another aspect of the present invention, a kind of engine assembly, including body, cylinder cap and piston, the piston are provided
For above-mentioned piston, piston is slidably arranged in body.
Piston provided by the invention, including combustion chamber, combustion chamber include the top surface set gradually from side to centre, first
Circular conical surface, the second circular conical surface and pit, the second circular conical surface are extended out from the opening of pit, and the first circular conical surface is remote from the second circular conical surface
Opening from pit extends out, and the oblique angle of the first circular conical surface is less than the oblique angle of the second circular conical surface.Due between top surface and pit
Therefore piston upper surface can be reduced by the second circular conical surface and the first circular conical surface by devising the first circular conical surface and the second circular conical surface
The wedge angle flow-disturbing of zonule and throat site between cylinder cap reduces big calorimetric and transmits, especially in top dead centre, from firepower
Heat transfer of the face to piston and from fire power face to cylinder cap.Since the oblique angle of the first circular conical surface is less than the oblique angle of the second circular conical surface,
Therefore narrow slit effect can be prevented by the taper of the first circular conical surface along preventing oily beam from directly striking cylinder wall by piston top
It causes flame moment to extinguish, generates the soot of accumulation and the HC of the unburned generation of fuel, reduce the discharge of engine, reduce heat
Loss promotes engine efficiency.
Description of the drawings
Fig. 1 is the three-dimensional structure diagram of the piston of the embodiment of the present invention；
Fig. 2 is the sectional structure chart of the piston of the embodiment of the present invention；
Fig. 3 is the chamber structure dimensional drawing of the piston of the embodiment of the present invention；
Fig. 4 is the first structure figure of the combustion chamber of the piston of the embodiment of the present invention；
Fig. 5 is the second structure chart of the combustion chamber of the piston of the embodiment of the present invention；
Fig. 6 is the third structure chart of the combustion chamber of the piston of the embodiment of the present invention；
Fig. 7 is the 4th structure chart of the combustion chamber of the piston of the embodiment of the present invention.
Reference numeral is expressed as：
1, combustion chamber；2, top surface；3, the first circular conical surface；4, the second circular conical surface；5, pit；6, arc groove；7, intermediate convex
It rises；8, central axis；9, firepower off coast disc.
Specific implementation mode
In conjunction with referring to shown in Fig. 1 to Fig. 7, according to an embodiment of the invention, piston includes combustion chamber 1, combustion chamber 1 include from
Top surface 2, the first circular conical surface 3, the second circular conical surface 4 and the pit 5 that side is set gradually to centre, the second circular conical surface 4 is from pit 5
Opening extends out, and the first circular conical surface 3 is extended out from the second opening of the circular conical surface 4 far from pit 5, and the oblique angle of the first circular conical surface 3 is small
In the oblique angle of the second circular conical surface 4.
It therefore can be by second due to devising the first circular conical surface 3 and the second circular conical surface 4 between top surface 2 and pit 5
Circular conical surface 4 and the first circular conical surface 3 reduce the zonule between piston upper surface and cylinder cap and the wedge angle flow-disturbing of throat site, reduce
Big calorimetric is transmitted, especially in top dead centre, heat transfer from fire power face to piston and from fire power face to cylinder cap.Due to first
The oblique angle of circular conical surface 3 is less than the oblique angle of the second circular conical surface 4, therefore can be by the taper of the first circular conical surface 3 along prevention oil Shu Zhi
Connected piston and answered back to and hit cylinder wall, and prevented narrow slit effect from flame moment being caused to extinguish, generate accumulation soot and fuel not
Burn the HC generated, reduces the discharge of engine, reduces thermal loss, promotes engine efficiency.
Piston has central axis 8, and the structure in the combustion chamber 1 of piston is relative to 8 central symmetry of central axis.Combustion chamber
1 the second circular conical surface 4 is expanded by the outward opening of pit 5, and the second circular conical surface 4 is between the first circular conical surface 3 and pit 5, and the
One circular conical surface 3 is expanded by the outward opening of the second circular conical surface 4 and is connect with top surface 2, and top surface 2 is connect with firepower off coast disc 9, fire
Power off coast disc 9 and the cylinder or cylinder jacket of body coordinate.Preferably, the central axis of pit 5 is overlapped with central axis 8.
In the section by the central axis 8 of piston, the angle α between the first circular conical surface 3 and top surface 2 is 70 ° and arrives
80°；And/or the second angle β between circular conical surface 4 and top surface 2 is 10 ° to 20 °.Preferably, the second circular conical surface 4 and top surface 2 it
Between angle β be 15 °.First circular conical surface 3 and the cooperation of the second circular conical surface 4 can reduce a large amount of to the flame of piston and cylinder cap biography
It passs.Since the angle between the first circular conical surface 3 and top surface 2 is more than the angle between the second circular conical surface 4 and top surface 2, therefore, it is possible to
Further the flame flowed along the second circular conical surface 4 is formed by the first circular conical surface 3 and is hindered, to more efficiently prevent oil
Beam directly by piston top, strikes cylinder wall, prevents narrow slit effect.
Between top surface 2 and the first circular conical surface 3, and/or between the first circular conical surface 3 and the second circular conical surface 4, and/or the second circle
It is connected by arc surface transition between the conical surface 4 and pit 5.The setting of arc surface transition structure is convenient for back flow of gas, improves combustion
The eddy velocity in room 1 is burnt, air-fuel mixture is promoted, improves engine combustion efficiency.
The increasing of eddy velocity, while the point of the zonule between piston upper surface and cylinder cap and throat site can be aggravated
Angle flow-disturbing, the setting of the first circular conical surface 3 and the second circular conical surface 4 reduce this part flow-disturbing, are passed as a result, reducing big calorimetric
It passs, especially in top dead centre, the heat transfer from fire power face to piston and from fire power face to cylinder cap.The reduction of these heats, band
The final result come is in combustion chamber 1 for compressing and the kinetic energy of reciprocating motion of the pistons being pushed to increase.And the reduction that heat is transmitted must
So the temperature of top land is brought to reduce, just can design the firepower case height of very little in this way, the case where firepower case height reduces
Under, under same skirt height, high reduction is compressed, piston whole height reduces, and cylinder block height reduces, engine weight drop
It is low, advantageously reduce fuel consumption.Equally, firepower case height reduce, narrow slit effect is also advantageous, can reduce soot and
The discharge of HC.
Pit 5 includes that the arc groove 6 being connected and intermediate projections 7, arc groove 6 are connected with the second circular conical surface 4, intermediate
Protrusion 7 is located at the center of pit 5.
The intermediate projections 7 are tapered protrusion or arc convex.In the section by the central axis 8 of piston, pit 5
It is acute angle or blunt to be formed by angle close to the tangent line of the second circular conical surface one side edge and the busbar extended line of the second circular conical surface 4
Angle.
In conjunction with referring to shown in Fig. 4 to Fig. 7, being four kinds of structures of combustion chamber.
Wherein Fig. 4 and Fig. 5 is the structure that intermediate projections 7 are tapered protrusion, and wherein Fig. 4 pits 5 are close to the second circular conical surface
It is acute angle that the busbar extended line of the tangent line of one side edge and the second circular conical surface 4, which is formed by angle, and Fig. 5 pits 5 are close to second
It is obtuse angle that the busbar extended line of the tangent line of circular conical surface one side edge and the second circular conical surface 4, which is formed by angle,.
Fig. 6 and Fig. 7 is the structure that intermediate projections 7 are arc convex, and wherein Fig. 6 pits 5 are close to the second circular conical surface side
It is acute angle that the busbar extended line of the tangent line at edge and the second circular conical surface 4, which is formed by angle, and Fig. 7 pits 5 are close to the second circular cone
It is obtuse angle that the busbar extended line of the tangent line of face one side edge and the second circular conical surface 4, which is formed by angle,.
Preferably, in the section by the central axis 8 of piston, pit 5 is cut close to the second circular conical surface one side edge
The distance between the central axis 8 of the intersection point of the busbar extended line of line and the second circular conical surface 4 relative to piston is R1, the second circular cone
The distance between the busbar extended line in face 4 and central axis 8 of the intersection point of top surface 2 relative to piston are R2, the firepower bank of piston
Central axis 8 the distance between of the intersection point of the extended line of periphery 9 and the extended line of top surface 2 relative to piston is R3, wherein
R1 is the 60%-80% of R3, and R2 is the 85%-97% of R3.
Enable to the fuel economy higher in combustion chamber 1, burning more abundant using this kind of structure.
Further, in the section by the central axis 8 of piston, the peak of intermediate projections 7 is P1, and pit 5 leans on
The intersection point of the busbar extended line of the tangent line of nearly second circular conical surface one side edge and the second circular conical surface 4 is P2, the mother of the first circular conical surface 3
Line and the intersection point of top surface 2 are P3, and the wherein height of P1 is higher than the height of P2, is less than the height of P3.
The design of combustion chamber 1 mainly considers to need to match with oily beam while performance, and fuel is made to be distributed in as possible
Entire combustion chamber is not sprayed onto cylinder wall, while the height for controlling P1 is higher than the height of P2, is less than the height of P3, and R1 is R3
60%-80%, R2 are the 85%-97% of R3, are in order to obtain the best fit of oily beam and chamber structure, while in master cylinder
Squish flow, make that fuel mixes with air more uniformly, more efficiently improve air utilization ratio, improve efficiency of combustion.
Above-mentioned piston can be assemblied in engine assembly, can be widely applied to medium and heavy truck, engineering machinery, ship
Oceangoing ship power assembly, generating set, automobile, farming equipment and recreation vehicle etc..
Above-mentioned piston can be a variety of different forms, including but not limited to radial type piston, one-piece piston, forging
Make piston, built-up piston and other well known general technologies of this field.A kind of metal, intermetallic may be used in piston
Object, ceramics or composite material are made, the synthesis of temperature and pressure when being able to stand 1 fuel combustion of piston combustion bowl so as to piston
Test.
According to an embodiment of the invention, engine assembly includes body, cylinder cap and piston, which is above-mentioned piston,
Piston is slidably arranged in body.
Those skilled in the art will readily recognize that under the premise of not conflicting, above-mentioned each advantageous manner can be free
Ground combination, superposition.
The above is merely preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
All any modification, equivalent and improvement made by within principle etc., should all be included in the protection scope of the present invention.Above only
It is the preferred embodiment of the present invention, it is noted that for those skilled in the art, do not departing from this hair
Under the premise of bright technical principle, several improvements and modifications can also be made, these improvements and modifications also should be regarded as the guarantor of the present invention
Protect range.
Claims (10)
1. a kind of piston, which is characterized in that including combustion chamber (1), the combustion chamber (1) includes being set gradually from side to centre
Top surface (2), the first circular conical surface (3), the second circular conical surface (4) and pit (5), second circular conical surface (4) is from the pit (5)
Opening extend out, first circular conical surface (3) extends out from second circular conical surface (4) far from the opening of the pit (5),
The oblique angle of first circular conical surface (3) is less than the oblique angle of second circular conical surface (4).
2. piston according to claim 1, which is characterized in that in the section by the central axis (8) of the piston,
Angle α between first circular conical surface (3) and the top surface (2) is 70 ° to 80 °；And/or
Angle β between second circular conical surface (4) and the top surface (2) is 10 ° to 20 °.
3. piston according to claim 1, which is characterized in that between the top surface (2) and first circular conical surface (3),
And/or between first circular conical surface (3) and second circular conical surface (4), and/or second circular conical surface (4) with it is described recessed
It is connected by arc surface transition between hole (5).
4. piston according to claim 1, which is characterized in that the pit (5) include the arc groove (6) being connected and
Intermediate projections (7), the arc groove (6) are connected with second circular conical surface (4), and the intermediate projections (7) are located at described recessed
Cheat the center of (5).
5. piston according to claim 4, which is characterized in that the intermediate projections (7) are that tapered protrusion or arc are convex
It rises.
6. piston according to claim 1, which is characterized in that in the section by the central axis (8) of the piston,
The pit (5) is close to the tangent line of the second circular conical surface one side edge and the busbar extended line of second circular conical surface (4)
The distance between the central axis (8) of intersection point relative to the piston is R1,
The busbar extended line of second circular conical surface (4) and central axis of the intersection point of the top surface (2) relative to the piston
The distance between (8) it is R2,
The intersection point of the extended line of the firepower off coast disc (9) of the piston and the extended line of the top surface (2) is relative to the work
The distance between central axis (8) of plug is R3,
Wherein, R1 is the 60%-80% of R3, and R2 is the 85%-97% of R3.
7. piston according to claim 4, which is characterized in that in the section by the central axis (8) of the piston,
The peak of the intermediate projections (7) is P1,
The pit (5) is close to the tangent line of the second circular conical surface one side edge and the busbar extended line of second circular conical surface (4)
Intersection point is P2,
The busbar of first circular conical surface (3) is P3 with the intersection point of the top surface (2),
Wherein the height of P1 is higher than the height of P2, is less than the height of P3.
8. piston according to claim 1, which is characterized in that in the section by the central axis (8) of the piston,
Busbar extended line institute of the pit (5) close to the tangent line and second circular conical surface (4) of the second circular conical surface one side edge
The angle of formation is acute angle or obtuse angle.
9. piston according to claim 2, which is characterized in that between second circular conical surface (4) and the top surface (2)
Angle β is 15 °.
10. a kind of engine assembly, including body, cylinder cap and piston, which is characterized in that the piston is in claim 1 to 9
Any one of them piston, the piston are slidably arranged in the body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810269844.4A CN108518287A (en) | 2018-03-29 | 2018-03-29 | Piston and engine assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810269844.4A CN108518287A (en) | 2018-03-29 | 2018-03-29 | Piston and engine assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108518287A true CN108518287A (en) | 2018-09-11 |
Family
ID=63431220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810269844.4A Pending CN108518287A (en) | 2018-03-29 | 2018-03-29 | Piston and engine assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108518287A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109404156A (en) * | 2018-12-10 | 2019-03-01 | 广西玉柴机器股份有限公司 | The combustion chamber of diesel engine with direct injection |
| CN112780526A (en) * | 2020-12-31 | 2021-05-11 | 江苏恒浩机电制造有限公司 | Easily-machined piston for refrigerator compressor and manufacturing process thereof |
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| CN202402157U (en) * | 2012-01-09 | 2012-08-29 | 东风康明斯发动机有限公司 | Steel diesel piston with low smoke intensity combustion chamber |
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| CN105909420A (en) * | 2016-06-14 | 2016-08-31 | 广西玉柴机器股份有限公司 | Combustion chamber capable of reducing soot in diesel engine cylinder |
| CN106593621A (en) * | 2017-01-25 | 2017-04-26 | 中国第汽车股份有限公司 | Diesel engine beveled lip combustion chamber |
| CN208122972U (en) * | 2018-03-29 | 2018-11-20 | 天津中恒动力研究院有限公司 | piston and engine assembly |
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| DE102005049443A1 (en) * | 2005-10-15 | 2007-04-26 | Daimlerchrysler Ag | Piston for internal combustion engine has outer second trough sector defined by elliptical shape in cross section |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109404156A (en) * | 2018-12-10 | 2019-03-01 | 广西玉柴机器股份有限公司 | The combustion chamber of diesel engine with direct injection |
| CN112780526A (en) * | 2020-12-31 | 2021-05-11 | 江苏恒浩机电制造有限公司 | Easily-machined piston for refrigerator compressor and manufacturing process thereof |
| CN112780526B (en) * | 2020-12-31 | 2022-03-04 | 江苏恒浩机电制造有限公司 | Easily-machined piston for refrigerator compressor and manufacturing process thereof |
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