CN111322170A - Piston combustion chamber of direct injection internal combustion engine - Google Patents
Piston combustion chamber of direct injection internal combustion engine Download PDFInfo
- Publication number
- CN111322170A CN111322170A CN202010250130.6A CN202010250130A CN111322170A CN 111322170 A CN111322170 A CN 111322170A CN 202010250130 A CN202010250130 A CN 202010250130A CN 111322170 A CN111322170 A CN 111322170A
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- Prior art keywords
- combustion chamber
- arc
- bulge
- piston
- direct injection
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
- F02B23/10—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
The invention discloses a direct injection type internal combustion engine piston combustion chamber, which comprises a reverse conical surface, wherein the upper part of the reverse conical surface extends to be connected with the top surface of a piston; the upper part of the straight line section on the side surface of the first step is in arc transition with the lower part of the side surface bus of the inverted conical surface; the upper part of the circular arc at the bottom of the first step is smoothly connected with the lower part of the straight line section on the side surface of the first step; the lower part of the convex straight line section is smoothly connected with the arc at the bottom of the first step; the upper part of the circular arc at the bottom of the bulge is smoothly connected with the upper part of the straight line section of the bulge through the circular arc at the top of the bulge; the upper part of the necking is in smooth transition with the lower part of the circular arc at the bottom of the bulge, and the lower part of the necking is in smooth transition with the circular arc at the bottom of the combustion chamber; the arc at the root of the central boss is in smooth transition with the arc at the bottom of the combustion chamber; wherein the bulge straight line segment, the bulge top arc and the bulge bottom arc form a flow guide bulge. The direct injection type internal combustion engine piston combustion chamber can reduce the generation of soot, and effectively inhibits the engine oil of which the soot enters the cylinder wall so as to protect the cylinder wall.
Description
Technical Field
The invention relates to the technical field of internal combustion engines, in particular to a direct injection type internal combustion engine piston combustion chamber with a circumferential flow guide bulge.
Background
The direct-injection internal combustion engine directly injects fuel into a cylinder, and then the fuel steam and air are mixed under the guidance of spray and a combustion chamber, and the combustion does work. It can be seen that the combustion chamber is a key design feature of the combustion system of the internal combustion engine, and the matching of the design feature of the combustion chamber and the spray can directly influence the combustion performance and the pollutant emission level of the internal combustion engine. A direct injection diesel engine is a typical direct injection internal combustion engine, and the emission regulations require continuous reduction of pollutant emission limit and fuel consumption rate of the direct injection diesel engine for vehicles, for example, the national range of 7 months in 2021 applies strict national sixth a emission regulations on diesel-powered vehicles, and compared with the national fifth emission limit, the national sixth emission limits reduce unburned Hydrocarbon (HC) by 72%, nitrogen oxide (NOx) by 80%, and soot (PM) by 50%; for another example, the oil consumption regulation limit of the heavy diesel vehicle in the third stage, which has been implemented in 2019, is reduced by 15% compared with that in the second stage. Therefore, there is a continuing need for improvements in the combustion systems, particularly combustion chambers, of direct injection internal combustion engines.
One typical shape of the combustion chamber of the direct-injection diesel engine at present is the omega shape and the modified shape thereof, as shown in fig. 1, three typical omega-shaped combustion chambers with a step characteristic are shown, wherein Da is called the diameter of the combustion chamber, Di is called the necking diameter of the combustion chamber, Tm is called the distance from the center of a transition circular arc to the top surface of a piston, and T is called the depth of the combustion chamber. A throat type combustion chamber is called when Da is larger than Di, a straight type combustion chamber is called when Da is larger than Di, and an open type combustion chamber is called when Da is smaller than Di.
The characteristics of an omega-shaped combustion chamber with a stepped feature are described below by way of example in fig. 2: the center of the combustion chamber is provided with a boss 15, the boss 15 can be a single round table or a plurality of round tables stacked, and the top surface of the boss can be a plane or a spherical surface. When the combustion chamber reaches the maximum diameter and extends to the top surface of the piston, the diameter of the combustion chamber is gradually reduced to the minimum value, so that a throat is formed in the combustion chamber, the diameter of the combustion chamber is increased when the combustion chamber extends to the top surface of the piston from the throat, an upper combustion chamber space 5 is formed in a step shape, and the side surface 4 of the step and the top surface of the piston are in circular arc smooth transition.
The omega-shaped combustion chamber with the step characteristics is matched with the intake vortex, so that air in the lower space 13 formed above the bottom arc 14 in the combustion chamber, the upper space 5 on the step and the space above the top surface of the piston can be fully utilized, the oil-air mixing quality in the cylinder is improved, the combustion efficiency is improved, and the carbon smoke emission is reduced. However, such combustion chambers still have a local over-rich mixture during the main combustion period, so that the combustion process generates a large amount of soot, and although most of the soot is oxidized during the post-combustion stage, the soot emission may be too high, and even the engine oil is degraded by the engine oil with soot entering the cylinder wall. Therefore, there is a continuing need for improved designs for such combustors to increase air utilization, increase thermal efficiency during the main combustion period, and reduce soot generation during the main combustion period.
The omega-shaped combustion chamber with a stepped feature of the prior art has the following drawbacks: as shown in fig. 2, the conventional omega-shaped combustion chamber with a stepped feature has a poor air utilization efficiency for a portion of the space 18 from above the throat to the centerline of the combustion chamber. Because the step bottom plane 6 tangent to the arc surface of the throat directly guides the fuel vapor to the step side surface 4 and the piston top surface 2, the fuel vapor cannot move to the space 18, thereby limiting the improvement of the thermal efficiency.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a piston combustion chamber of a direct injection type internal combustion engine, which is characterized in that a flow guide bulge is designed on a step of an omega-shaped combustion chamber, fuel steam moves to the side wall of the combustion chamber and then collides with the wall for flow distribution, one part of the fuel steam moves to the bottom of the combustion chamber along the side wall of the lower space of the combustion chamber, the other part of the fuel steam enters the upper space of the step of the combustion chamber through a transition arc (necking) between the combustion side wall and the bottom of the step, and the air utilization between the flow guide bulge and the central line of the combustion chamber can be effectively improved, so that the generation of soot can be reduced, and the engine oil of the soot entering the cylinder wall can be effectively inhibited to.
In order to achieve the purpose, the invention provides a direct injection type internal combustion engine piston combustion chamber which is positioned at the upper part of a piston body and comprises an inverted conical surface, a first step side surface straight line section, a first step bottom arc, a convex straight line section, a convex bottom arc, a necking and a central boss. The upper part of the inverted conical surface extends to be connected with the top surface of the piston; the upper part of the straight line section on the side surface of the first step is in arc transition with the lower part of the side surface bus of the inverted conical surface; the upper part of the circular arc at the bottom of the first step is smoothly connected with the lower part of the straight line section on the side surface of the first step; the lower part of the convex straight line section is smoothly connected with the arc at the bottom of the first step; the upper part of the circular arc at the bottom of the bulge is smoothly connected with the upper part of the straight line section of the bulge through the circular arc at the top of the bulge; the upper part of the necking is in smooth transition with the lower part of the circular arc at the bottom of the bulge, and the lower part of the necking is in smooth transition with the circular arc at the bottom of the combustion chamber; the arc at the root of the central boss is in smooth transition with the arc at the bottom of the combustion chamber; wherein the bulge straight line segment, the bulge top arc and the bulge bottom arc form a flow guide bulge.
In a preferred embodiment, the direct injection internal combustion engine piston combustion chamber further comprises a first step bottom surface straight line section, and the convex straight line section and the first step bottom arc are smoothly connected through the first step bottom surface straight line section.
In a preferred embodiment, the straight convex segment and the circular arc at the bottom of the convex segment are transitionally connected through the plane at the top of the convex segment.
In a preferred embodiment, the straight section of the bulge and the circular arc at the bottom of the bulge are transitionally connected by a slope at the top of the bulge.
In a preferred embodiment, the included angle between the inner tangent of the arc of the top of the protrusion and the arc of the bottom of the protrusion and the top surface of the piston is 60-90 degrees.
In a preferred embodiment, the angle between the straight projection line segment and the top surface of the piston is less than or equal to 25 degrees.
In a preferred embodiment, the centre line of the combustion chamber and the centre line of the piston body coincide.
In a preferred embodiment, the centerline of the combustion chamber and the centerline of the piston body do not coincide.
In a preferred embodiment, the combustion chamber diameter is greater than, equal to, or less than the throat diameter.
In a preferred embodiment, the ratio of the centre of the throat to the depth of the piston crown and combustion chamber is between 0.35 and 0.47.
Compared with the prior art, the direct injection type internal combustion engine piston combustion chamber is provided with the flow guide bulge on the step of the omega-shaped combustion chamber with the step characteristic, fuel steam moves to the side wall of the combustion chamber and then collides with the wall to be divided, part of the fuel steam moves to the bottom of the combustion chamber along the side wall of the lower space of the combustion chamber, the other part of the fuel steam enters the upper space of the step of the combustion chamber through the transition arc (necking) of the combustion side wall and the bottom surface of the step, the fuel steam entering the step preferably climbs upwards along the bottom arc and the top arc of the flow guide bulge, the fuel steam rushes to the bottom surface of a cylinder cover at a certain angle α under the guidance of the flow guide bulge, then the fuel steam moves and diffuses towards the two sides of the bottom surface of the cylinder, one part of the fuel steam moves to the bulge flow guide space between the flow guide bulge above the combustion center line, and the other part of the fuel steam moves to the bulge flow guide space above the first step and the bulge above the top surface of the piston, so that the air utilization between the bulge above the combustion center line of the combustion chamber can be effectively improved, the heat efficiency.
Drawings
FIGS. 1 a-1 c are schematic views of combustion chamber varieties of an omega type direct injection diesel engine;
FIG. 2 is a schematic view of a combustion chamber of an omega type direct injection diesel engine;
FIG. 3 is a schematic cross-sectional view of a piston combustion chamber according to an embodiment of the present invention;
FIG. 4 is a partial enlarged view of a guide protrusion according to an embodiment of the present invention;
FIG. 5 is a dimensional definition of a piston combustion chamber according to an embodiment of the present invention;
fig. 6 is a schematic diagram of the spray movement of a piston combustion chamber according to an embodiment of the present invention.
Description of the main reference numerals:
1-a piston body, 2-a piston top surface, 3-an inverted conical surface, 4-a first step side surface straight line segment, 5-a first step bottom arc, 6-a first step bottom surface straight line segment, 7-a first step upper space, 8-a bulge straight line segment, 9-a guide bulge, 10-a bulge top arc, 11-a bulge bottom arc, 12-a necking, 13-a combustion chamber lower space, 14-a combustion chamber bottom arc, 15-a central boss, 16-a combustion chamber central line, 17-a piston pin hole, 18-a bulge guide space, 19-a cylinder cover bottom surface, Da-a combustion chamber diameter and Di-a necking diameter.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
In the present specification, like reference numerals in the drawings denote like features. The term "upper" in the "upper side" in the present invention refers to a direction from the piston pin hole toward the piston top surface. The term "lower" in the "lower portion", "underside" refers to a direction pointing away from the top surface of the piston toward the piston pin bore. The term "inner" refers to the side near the centerline of the combustion chamber and the term "outer" refers to the side away from the centerline of the combustion chamber.
Referring to fig. 3 and 4, a combustion chamber of a direct injection internal combustion engine piston according to a preferred embodiment of the present invention is located at an upper portion of a piston body 1, and includes a reverse tapered surface 3, a first step side surface straight line segment 4, a first step bottom arc 5, a first step bottom surface straight line segment 6, a convex straight line segment 8, a convex top arc 10, a convex bottom arc 11, a throat 12, and a central boss 15. The upper part of the inverted conical surface 3 extends to be connected with the top surface 2 of the piston. The upper part of the straight-line section 4 on the side surface of the first step is in arc transition with the lower part of the side surface generatrix of the inverted conical surface 3. The upper part of the first step bottom arc 5 is smoothly connected with the lower part of the first step side straight line section 4. Protruding straightway 8 and first step bottom circular arc 5 link up smoothly through first step bottom surface straightway 6, that is to say 5 lower extremes of first step bottom circular arc and the one end smooth linking of first step bottom surface straightway 6, and the other end of first step bottom surface straightway 6 can link up smoothly through the lower extreme of one section transition circular arc and protruding straightway 8. The upper part of the arc 11 at the bottom of the bulge is smoothly connected with the upper part of the straight section 8 of the bulge through the arc 10 at the top of the bulge. The upper part of the necking 12 is in smooth transition with the lower part of the bottom arc 11 of the bulge, and the lower part of the necking is in smooth transition with the bottom arc 14 of the combustion chamber. The arc at the root of the central boss 15 is in smooth transition with the arc 14 at the bottom of the combustion chamber. Wherein the bulge straight line segment 8, the bulge top arc 10 and the bulge bottom arc 11 form a flow guide bulge 9.
Referring to fig. 3, in some embodiments, the combustion chamber of the direct injection internal combustion engine of the present invention is located above the piston body 1 and above the piston pin hole 17, and the combustion chamber center line 16 may coincide with the center line of the piston body 1 or may be offset a certain distance from the center line of the piston body 1. The center of the piston combustion chamber of the direct injection internal combustion engine is provided with a central boss 15, the lower side of the central boss 15 is provided with a circular arc which is in smooth transition with the inner end of a bottom circular arc 14 of the combustion chamber, and the outer side of the bottom circular arc 14 of the combustion chamber forms a part of the side wall of a lower space 13 of the combustion chamber. For a combustion chamber with a necking 12, the outer end of an arc 14 at the bottom of the combustion chamber is smoothly connected with the arc of the necking 12 through a straight line segment. If the combustion chamber is a straight port or an open combustion chamber, the necking 12 is not formed, and the outer end of the bottom arc 14 of the combustion chamber is directly and smoothly connected with the bottom arc 11 of the bulge through an arc. Above the necking 12, the combustion chamber has the characteristic of double steps, the bottom of the first step is provided with a flow guide bulge 9, and the lower side of the flow guide bulge 9 is provided with a bulge bottom arc 11 which is smoothly connected with the necking 12. The top of the guide protrusion 9 of the present embodiment is designed to be a circular arc, that is, the circular arc 10 of the top of the guide protrusion 9, and in some embodiments, the top of the guide protrusion 9 may also be designed to be a plane of the top of the protrusion or a slant of the top of the protrusion. In addition, in some embodiments, the convex bottom arc 11 and the convex top arc 10 of the guide protrusion 9 may be smoothly connected by a straight line segment. The upper side surface of the flow guide bulge 9 is provided with a bulge straight-line segment 8, and the bulge straight-line segment 8 is in smooth transition with the first step bottom surface straight-line segment 6 through an arc. The straight line section 6 at the bottom surface of the first step is smoothly connected with the straight line section 4 at the side surface of the first step through the circular arc 5 at the bottom of the first step. In some embodiments the raised linear section 8 may smoothly join directly with the first step lateral linear section 4 directly through the first step bottom arc 5. Without the features of the first step floor straight line segment 6. The straight line section 4 of the side surface of the first step and a bus of the inverted conical surface 3 (a second step) are in circular arc transition, and the inverted conical surface 3 of the second step extends to the top surface 2 of the piston.
Referring to fig. 4, the included angle between the inner common tangent of the bottom arc 11 and the top arc 10 of the protrusion and the top surface 2 of the piston is α, 60 < α < 90 °, in some embodiments, if there is a straight line segment smoothly connected between the bottom arc 11 and the top arc 10 of the protrusion, the straight line segment is the inner common tangent of the bottom arc 11 and the top arc 10 of the protrusion, the included angle between the straight line segment 8 of the protrusion and the top surface 2 of the piston is β ° or less than 25 °.
Referring to fig. 5, the diameter of the combustion chamber is Da, the diameter of the throat is Di, and the distance from the center of the arc of the throat 12 to the top surface 2 of the piston is Tm. For the straight-mouth and open-mouth combustion chamber shown in FIG. 1, the arc of the throat 12 in the original throat 12 type combustion chamber shall be referred to as the transition arc of the combustion chamber bottom side wall and the step, the distance from the center of the transition arc to the top surface 2 of the piston is Tm, the depth of the combustion chamber is defined as T, and Tm/T is more than or equal to 0.35 and less than or equal to 0.47.
Depending on the location and shape of the combustion chamber steps, and the fact that the omega-shaped combustion chamber may be of the reduced-throat type (i.e. with a reduced throat) or may be straight or open, the guide projection of the present invention may be implemented in a number of ways and should not be construed as being limited to the embodiments described above.
Referring to fig. 6, the working principle of the piston combustion chamber of the direct injection internal combustion engine of the present invention is as follows:
the piston comprising the combustion chamber of the present invention is mounted in a cylinder of an internal combustion engine, and a fuel injector is mounted on the cylinder head, the center line of the fuel injector may coincide with the center line 16 of the combustion chamber, and may also be offset from the center of the combustion chamber, as exemplified by the operation of a four-stroke internal combustion engine, at the end of the compression stroke, the piston approaches top dead center, the fuel injector receives a control signal from an engine controller, and opens the fuel injector to inject liquid fuel into the combustion chamber, as shown by the arrows in fig. 6, the liquid fuel injection orifice is directed toward the wall of the combustion chamber and is atomized as the liquid fuel is broken up, a fuel vapor is formed at and around the liquid spray front, the fuel vapor has a momentum to move toward the wall of the combustion chamber, the fuel vapor moves toward the wall of the combustion chamber, hits the wall to split, a portion of the fuel vapor moves along the sidewall of the lower portion of the combustion chamber, and a portion of the fuel vapor enters the combustion chamber through a first guide bulge 359, and a second guide bulge is defined as a portion of a circular arc top of the combustion chamber, which the top of the combustion chamber, and a top of the combustion chamber, the top of the cylinder, the top of the cylinder, and a portion of the cylinder, the top of the cylinder, the top of the cylinder, the top of the cylinder, the top of the cylinder, and the top of the cylinder, and the cylinder, the top of the cylinder, the top of the cylinder.
In summary, the piston combustion chamber of the direct injection internal combustion engine of the present invention is designed with a flow guiding protrusion on the step of the omega-shaped combustion chamber with step feature, after the fuel vapor moves to the side wall of the combustion chamber, the fuel vapor collides with the wall and is divided, a part of the fuel vapor moves to the bottom of the combustion chamber along the side wall of the lower space of the combustion chamber, another part of the fuel vapor enters the upper space of the step of the combustion chamber through the transition arc (throat) of the combustion side wall and the bottom of the step, the fuel vapor entering the step first climbs upwards along the bottom arc and the top arc of the flow guiding protrusion, and rushes to the bottom of the cylinder head at a certain angle α under the guidance of the flow guiding protrusion, then the fuel vapor moves and diffuses to the two sides of the bottom of the cylinder, a part of the fuel vapor moves to the convex flow guiding space between the flow guiding protrusion and the combustion center line, and another part of the fuel vapor moves to the convex flow guiding space above the first step and the top of the piston.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (10)
1. A piston combustion chamber of a direct injection internal combustion engine located at an upper portion of a piston body, comprising:
the upper part of the inverted cone extends to be connected with the top surface of the piston;
the upper part of the first step side surface straight line section is in circular arc transition with the lower part of the side surface bus of the inverted conical surface;
the upper part of the arc at the bottom of the first step is smoothly connected with the lower part of the straight line section on the side surface of the first step;
the lower part of the convex straight line section is smoothly connected with the arc at the bottom of the first step;
the upper part of the arc at the bottom of the bulge is smoothly connected with the upper part of the straight-line section of the bulge through the arc at the top of the bulge;
the upper part of the necking is in smooth transition with the lower part of the circular arc at the bottom of the bulge, and the lower part of the necking is in smooth transition with the circular arc at the bottom of the combustion chamber; and
the circular arc at the root of the central boss is in smooth transition with the circular arc at the bottom of the combustion chamber;
the flow guide bulge is formed by the bulge straight line segment, the bulge top circular arc and the bulge bottom circular arc.
2. The direct injection internal combustion engine piston combustion chamber of claim 1 further comprising a first stepped bottom surface straight line segment, said raised straight line segment and said first stepped bottom arc being smoothly joined by said first stepped bottom surface straight line segment.
3. The direct injection internal combustion engine piston combustion chamber of claim 1 wherein said lobe linear section and said lobe base arc are transitionally joined by a lobe top plane.
4. The direct injection internal combustion engine piston combustion chamber of claim 1 wherein said convex straight section and said convex bottom arc are transitionally joined by a convex top ramp.
5. The direct injection internal combustion engine piston combustion chamber of claim 1 wherein the angle between the internal tangent to the arc of the convex top and the arc of the convex bottom and the top surface of the piston is between 60 ° and 90 °.
6. The direct injection internal combustion engine piston combustion chamber of claim 1 wherein said straight raised line segment makes an angle of 25 ° or less with said piston crown surface.
7. The direct injection internal combustion engine piston combustion chamber of claim 1 wherein a centerline of said combustion chamber and a centerline of said piston body coincide.
8. The direct injection internal combustion engine piston combustion chamber of claim 1 wherein a centerline of said combustion chamber and a centerline of said piston body are not coincident.
9. The piston combustion chamber of a direct injection internal combustion engine of claim 2 wherein the combustion chamber diameter is greater than, equal to, or less than the throat diameter.
10. The direct injection internal combustion engine piston combustion chamber of claim 2 wherein the ratio of the center of said throat to the depth of said piston top surface and said combustion chamber is between 0.35 and 0.47.
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| CN202010250130.6A CN111322170A (en) | 2020-04-01 | 2020-04-01 | Piston combustion chamber of direct injection internal combustion engine |
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| CN202010250130.6A CN111322170A (en) | 2020-04-01 | 2020-04-01 | Piston combustion chamber of direct injection internal combustion engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114526152A (en) * | 2022-04-22 | 2022-05-24 | 潍柴动力股份有限公司 | Combustion chamber and diesel engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114526152A (en) * | 2022-04-22 | 2022-05-24 | 潍柴动力股份有限公司 | Combustion chamber and diesel engine |
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