CN209469485U - It is a kind of suitable for Miller/Atkinson cycle straight spray type engine combustion chamber - Google Patents
It is a kind of suitable for Miller/Atkinson cycle straight spray type engine combustion chamber Download PDFInfo
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- CN209469485U CN209469485U CN201920170172.1U CN201920170172U CN209469485U CN 209469485 U CN209469485 U CN 209469485U CN 201920170172 U CN201920170172 U CN 201920170172U CN 209469485 U CN209469485 U CN 209469485U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
The utility model relates to a kind of suitable for Miller/Atkinson cycle straight spray type engine combustion chamber, hemispherical bottom, inlet valve, exhaust valve bottom surface, the cylinder wall surface of cylinder body, the head of piston, direct fuel injection nozzle and spark plug including cylinder cap, direct fuel injection nozzle is located at one side-lower of inlet valve, and spark plug is located at cylinder cover bottom surface center.Piston crown is equipped with the top bump that lateral surface is conical surface shape, and top bump is respectively equipped with inlet valve pit and exhaust valve pit in corresponding inlet valve side and exhaust valve side position；The intermediate region of top bump is equipped with the cylindrical surface pit penetrated through along piston pin hole axis direction；Cylindrical surface pit two sides set that there are two penetrate through direction and symmetrical jet flow groove perpendicular to it；Cylindrical surface pit can keep stronger tumble motion to make it until compression top center is broken, and jet flow groove can be in the jet stream of near generation direction burning chamber central zone, to effectively improve the turbulence intensity in combustion process jointly.
Description
Technical field
The utility model relates to engines, and in particular to a kind of to start suitable for Miller/Atkinson cycle direct injection
Machine combustion chamber.
Background technique
Increasingly strict with the relevant laws and regulations for motor vehicle emission and oil consumption, hybrid vehicle is because strong with feasibility
And the features such as energy-saving and emission-reduction, the hot spot of automobile industry research is had become at present.Hybrid vehicle can by motor assist to
The power demand to engine is reduced, simplifies engine operation condition, therefore engine mostly uses Miller/Sydney Atkinson to follow at present
Ring further decreases partial load condition oil consumption, to promote overall economy quality, reduces CO2The emission level of equal substances.
Miller cycle and Atkinson cycle are that early pass and evening close using inlet valve respectively, are guaranteeing the unobvious increasing of compression ratio
In the case where adding, the expansion ratio of engine is improved, to improve the thermal efficiency of engine.However in the process, due to air inlet
Door is early to close or evening closes, and makes to be effectively compressed and lags constantly, and leading to time of ignition, nearby compression temperature reduces, therefore will cause engine
Burn rate decline, influence effective thermal efficiency improvement.When carrying out Miller/Atkinson cycle engine exploitation, need to be directed to
Combustion system of engine advanced optimizes.In the process, to realize generalization and reducing cost, usually not to cylinder cover structure into
Row change.And volumetric efficiency will usually be reduced by air flue design increase Tumble intensity, thus deteriorate low speed torque further,
Therefore become particularly significant by piston-top surface design optimization chamber structure, need on the basis for realizing high compression ratio design
It is upper further to improve In-Cylinder Flow state, turbulence intensity in cylinder is improved, promotes air-fuel mixture, to accelerate burn rate, more preferably
Performance Miller/Atkinson cycle high expansion ratio advantage.
Patent document CN204003076U discloses a kind of direct injection Atkinson cycle engine chamber structure, including
The direct-injection combustion chamber that the space surrounded below the inner wall of cylinder body, the top of direct-injection piston and high tumble flow cylinder cap is constituted,
Exhaust cam shaft, admission cam shaft, air intake duct and the Integral type cam bearing cover being located on the high tumble flow cylinder cap.One high pressure oil
Pump is located on the Integral type cam bearing cover, and the oiler of the high-pressure oil pump is connected to by oil pipe with fuel tank.One high pressure fuel
Distributor is located on the high tumble flow cylinder cap, and the oil outlet of the high-pressure oil pump passes through high pressure flowline and the high pressure fuel point
Orchestration connection communicates.One high pressure nozzle is located on the high tumble flow cylinder cap, and the high pressure nozzle one end and the high pressure fuel distribute
Device communicates, the other end is communicated with the direct-injection combustion chamber.
Patent document CN202451292U discloses a kind of engine piston for Atkinson cycle, piston only
The middle part on top is equipped with the protrusion of perforation front and back, and the left and right side of the protrusion is symmetrical, and left side is cheated equipped with inlet valve, and right side is equipped with
Exhaust valve hole.It is equipped with pit at the middle part of the protrusion, the left part and right part on the piston only top are respectively plane, and left
The plane of portion and right part passes through inclined-plane respectively and is connected with the left and right side of the protrusion.
Patent documents above is not directed to the improving environment scheme of combustion process air-flow formation.
Summary of the invention
It burns the purpose of the utility model is to provide a kind of suitable for Miller/Atkinson cycle direct injection ic engine
Room increases in-cylinder tumble flow and maintains ability, it is strong to improve the intracorporal turbulent flow of combustion process middle cylinder while realizing high compression ratio design
Degree accelerates burn rate.
It is described in the utility model a kind of suitable for Miller/Atkinson cycle straight spray type engine combustion chamber, including
Hemispherical bottom, inlet valve, the bottom surface of exhaust valve, the cylinder wall surface of cylinder body, piston crown, direct fuel injection nozzle and the fire of cylinder cap
Hua Sai, direct fuel injection nozzle are located at one side-lower of inlet valve, and spark plug is located at cylinder cover bottom surface center；
The piston crown is equipped with the top bump that lateral surface is conical surface shape, and the top bump corresponds to inlet valve in two sides
Side and the position of exhaust valve side are respectively equipped with inlet valve pit and exhaust valve pit, and the top bump intermediate region is equipped with along flat
The cylindrical surface pit that row is penetrated through in piston pin hole axis direction, for keeping stronger tumble flow before compression top center；
Cylindrical surface pit two sides set that there are two penetrate through direction and symmetrical jet flow groove, the jet stream perpendicular to it
Slot is used to generate the jet stream of direction burning chamber central zone near.
Further, the axis of the axis and the spark plug of the direct fuel injection nozzle is generally aligned in the same plane.
Further, the angle between the cone element of the top bump and the piston crown cross section and the exhaust
Angle between door bottom surface and the piston crown cross section is identical.
Further, the bottom surface of the top bump is identical as the head cylindrical cross section diameter of the piston；The work
When plug is located at top dead centre, the either flush of the top bump bottom surface and the cylinder body.
Further, the ratio range of the radius of curvature of the cylindrical surface pit and cylinder diameter is 1.1-1.4, and the cylindrical surface is recessed
The distance between the bottom surface of the minimum point in hole and top bump range is 0.5-1mm.
Further, described compared to the angle between the cone element of the top bump and the piston crown cross section
Angle between the bottom surface of jet flow groove and the piston crown cross section reduces 5 ° -7 °.
Further, the intersection segment length that the bottom surface of the jet flow groove is intersected with the bottom surface of the top bump is 6-
9mm, the intersection segment length intersected with the cylindrical surface pit is 3-4.5mm, wherein the bottom surface with top bump is intersected
To intersection section two-end-point be located on the contour line of the top bump bottom surface.
The beneficial effects of the utility model are:
The in-cylinder tumble flow in air inlet and compression travel can be improved to the guidance of air motion by piston top cylindrical surface pit
Intensity, and preferably maintain tumble flow to compression top center, and then increase because of its broken turbulent flow generated.On the other hand, at top
Under the squish flow effect generated between protrusion and the bottom surface of cylinder cap, the jet flow groove on piston-top surface can be produced near
The raw jet stream for being directed toward burning chamber central zone further increases turbulence intensity in cylinder so that strengthening airflow is collided.
It can reinforce air-fuel mixture by above two mode collective effect, hence it is evident that rate of flame propagation is improved, thus not
Miller/Atkinson cycle burn rate decline, preferably performance rice are effectively solved the problems, such as in the case where change cylinder cover structure
Le/Atkinson cycle high expansion ratio advantage improves the gasoline engine thermal efficiency.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is the structural schematic diagram of piston crown；
Fig. 3 is the left view of Fig. 2 piston.
In figure:
1- piston, the cylindrical surface 10- pit, 11- jet flow groove, 12- top bump, 13- inlet valve pit, 14- exhaust valve are recessed
Hole；
2- cylinder cap；
3- spark plug；
4- cylinder body, 40- cylinder wall surface；
5- inlet valve；
6- exhaust valve；
7- direct fuel injection nozzle.
Specific embodiment
With reference to embodiment and attached drawing is described further the technical program.
Referring to Fig. 1 to Fig. 3, shown in it is a kind of suitable for Miller/Atkinson cycle straight spray type engine combustion chamber, packet
Include hemispherical bottom, inlet valve 5, the bottom surface of exhaust valve 6, the cylinder wall surface 40 of cylinder body 4, the head of piston 1, the direct-injection of cylinder cap 2
Fuel nozzle 7 and spark plug 3, the direct fuel injection nozzle 7 are located at one side-lower of inlet valve, and the spark plug 3 is located at the cylinder
The bottom center position of lid 2；
1 head of piston is equipped with the top bump 12 that lateral surface is conical surface shape, and the top bump 12 is corresponding in two sides
The position of inlet valve 5 and exhaust valve 6 is respectively equipped with inlet valve pit 13 and exhaust valve pit 14,12 middle area of top bump
Domain is equipped with along the cylindrical surface pit 10 for being parallel to the perforation of the piston pin hole direction axis L3, for keeping relatively strong before compression top center
Tumble flow；
10 two sides of cylindrical surface pit are set there are two penetrating through direction and symmetrical jet flow groove 11 perpendicular to it, described
Jet flow groove 11 is used to generate the jet stream of direction burning chamber central zone near.
The axis of the direct fuel injection nozzle 7 and the axis of the spark plug 3 are generally aligned in the same plane.
Angle α and the exhaust valve 6 between the cone element of the top bump 12 and the head cross-sectional of the piston 1
1 head cross-sectional of bottom surface and the piston between angle it is identical.
The bottom surface S of the top bump 12 is identical as the cylindrical cross section diameter on 1 head of piston；The piston 1
When positioned at top dead centre, the either flush of the bottom surface S and the cylinder body 4.
The radius of curvature R 1 of the cylindrical surface pit 10 and the ratio range of cylinder diameter are 1.1-1.4, the cylindrical surface pit
The distance between 10 minimum point and the bottom surface S h range are 0.5-1mm.
The bottom surface of the jet flow groove 11 angle α compared with the angle β between the head cross-sectional of the piston 1 reduces
5°-7°；The bottom surface S of the bottom surface of the jet flow groove 11 and the top bump 12 intersects at line segment L1, length range 6-9mm,
Line segment L2 is intersected at the cylindrical surface pit 10, the two-end-point of length range 3-4.5mm, the line segment L1 are located at the bottom
On the contour line of face S.
The above is only the preferred embodiment of the technical program, it is noted that for the common skill of the art
For art personnel, under the premise of not departing from the technical program principle, several improvement and replacement can also be made, these improve and
Replacement also should be regarded as the protection scope of the technical program.
Claims (7)
1. a kind of suitable for Miller/Atkinson cycle straight spray type engine combustion chamber, the hemispherical bottom including cylinder cap (2)
Face, inlet valve (5) and the bottom surface of exhaust valve (6), the cylinder wall surface (40) of cylinder body (4), the head of piston (1) and direct fuel injection
Nozzle (7) and spark plug (3), direct fuel injection nozzle (7) are located at one side-lower of inlet valve, and spark plug (3) is located in cylinder cover bottom surface
Heart position；It is characterized by:
Piston (1) head is equipped with the top bump (12) that lateral surface is conical surface shape, and the top bump (12) is in two sides pair
Answer that the position of inlet valve (5) and exhaust valve (6) is respectively equipped with inlet valve pit (13) and exhaust valve pit (14), the top are convex
It plays (12) intermediate region to be equipped with along the cylindrical surface pit (10) for being parallel to the perforation of the piston pin hole direction axis L3, in compression
Stronger tumble flow is kept before stop；
Cylindrical surface pit (10) two sides are set there are two penetrating through direction and symmetrical jet flow groove (11) perpendicular to it, described
Jet flow groove (11) is used to generate the jet stream of direction burning chamber central zone near.
2. it is according to claim 1 a kind of suitable for Miller/Atkinson cycle straight spray type engine combustion chamber, it is special
Sign is that the axis of the axis and the spark plug (3) of the direct fuel injection nozzle (7) is generally aligned in the same plane.
3. it is according to claim 1 a kind of suitable for Miller/Atkinson cycle straight spray type engine combustion chamber, it is special
Sign is, angle α and the exhaust between the cone element of the top bump (12) and the head cross-sectional of the piston (1)
Angle between the bottom surface and the piston (1) head cross-sectional of door (6) is identical.
4. it is according to claim 1 a kind of suitable for Miller/Atkinson cycle straight spray type engine combustion chamber, it is special
Sign is that the bottom surface S of the top bump (12) is identical as the cylindrical cross section diameter on the piston (1) head；The work
When plug (1) is located at top dead centre, the either flush of the bottom surface S and the cylinder body (4).
5. it is according to claim 1 a kind of suitable for Miller/Atkinson cycle straight spray type engine combustion chamber, it is special
Sign is that the radius of curvature R 1 of the cylindrical surface pit (10) and the ratio range of cylinder diameter are 1.1-1.4, the cylindrical surface pit
(10) the distance between the bottom surface S of minimum point and the top bump (12) h range is 0.5-1mm.
6. it is according to claim 3 a kind of suitable for Miller/Atkinson cycle straight spray type engine combustion chamber, it is special
Sign is, compares the angle α, and the angle β between jet flow groove (11) bottom surface and the piston (1) head cross-sectional reduces
5°-7°。
7. it is according to claim 1 a kind of suitable for Miller/Atkinson cycle straight spray type engine combustion chamber, it is special
Sign is that the bottom surface of the jet flow groove (11) and the bottom surface S of the top bump (12) intersect at line segment L1, length 6-9mm,
Line segment L2, length 3-4.5mm are intersected at the cylindrical surface pit (10), wherein the two-end-point of the line segment L1 is positioned at described
On the contour line of bottom surface S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920170172.1U CN209469485U (en) | 2019-01-31 | 2019-01-31 | It is a kind of suitable for Miller/Atkinson cycle straight spray type engine combustion chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920170172.1U CN209469485U (en) | 2019-01-31 | 2019-01-31 | It is a kind of suitable for Miller/Atkinson cycle straight spray type engine combustion chamber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209469485U true CN209469485U (en) | 2019-10-08 |
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ID=68094387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920170172.1U Active CN209469485U (en) | 2019-01-31 | 2019-01-31 | It is a kind of suitable for Miller/Atkinson cycle straight spray type engine combustion chamber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209469485U (en) |
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2019
- 2019-01-31 CN CN201920170172.1U patent/CN209469485U/en active Active
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