CN210858963U - Engine piston, engine and vehicle - Google Patents
Engine piston, engine and vehicle Download PDFInfo
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- CN210858963U CN210858963U CN201921650764.XU CN201921650764U CN210858963U CN 210858963 U CN210858963 U CN 210858963U CN 201921650764 U CN201921650764 U CN 201921650764U CN 210858963 U CN210858963 U CN 210858963U
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Abstract
The utility model relates to an engine piston, engine and vehicle. The engine piston top is provided with the combustion chamber, and the combustion chamber includes: an upper step having an axial cross-section comprising a first arc; the axial section of the first step comprises a second step straight-line section and a third arc line, and the second arc line and the second step straight-line section are smoothly connected through a fourth arc line; a bottom arc smoothly connected with the third arc line; and the central boss is smoothly connected with the bottom arc. Through the smooth connection in the same direction as the arc line of fourth between first step and the second step, can realize better drainage effect to the air in the combustion chamber, realize effectively utilizing the air in the combustion chamber, further improve combustion efficiency, reduce the cigarette carbon and discharge.
Description
Technical Field
The utility model relates to an engine technical field especially relates to an engine piston, engine and vehicle.
Background
The existing high-pressure direct injection gas engine is closer to a diesel engine in the combustion process, so that the combustion chamber form of the diesel engine is mostly used for reference or directly adopted. However, due to the difference of physical properties of gas and diesel oil, the momentum of gas fuel is small, and the penetration distance is larger, so that the traditional diesel engine combustion chamber cannot completely meet the requirement of the traditional diesel engine combustion chamber on air and gas mixing, and further causes the problems of large gas consumption, high soot emission and the like of a direct injection gas engine in a cylinder.
Therefore, an engine piston is needed to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an engine piston, engine and vehicle can improve combustion efficiency, reduces the cigarette carbon and discharges.
To achieve the purpose, the utility model adopts the following technical proposal:
an engine piston is provided, the top of which is provided with a combustion chamber, the combustion chamber comprises:
the upper step is an annular surface of a combustion chamber in arc contact with the top surface of the piston, and the axial section of the upper step comprises a first arc line with the arc center pointing to the outer side of the combustion chamber;
the axial section of the first step comprises a first step straight line section and a second arc line, the first step straight line section is respectively and smoothly connected with the first arc line and the second arc line, and the arc center of the second arc line points to the outer side of the combustion chamber;
the axial section of the second step comprises a second step straight-line section and a third arc line, and the second arc line and the second step straight-line section are smoothly connected through a fourth arc line;
a bottom arc located at a lower portion of the third arc, the bottom arc smoothly connecting with the third arc;
the central boss is positioned in the center of the combustion chamber and is smoothly connected with the bottom arc.
As a preferable technical scheme of the engine piston, the first step straight line segment is arranged in parallel with the surface of the top of the piston, and the included angle between the second step straight line segment and the surface of the top of the piston is 3-20 degrees.
As a preferable technical scheme of the engine piston, the height of the first step is 6 mm-10 mm.
As a preferable technical scheme of the engine piston, the height of the second step is 1 mm-3 mm.
As a preferable technical solution of the engine piston, a difference between a distance from the second arc line to a center of the combustion chamber and a distance from the third arc line to the center of the combustion chamber is 6mm to 10mm, and a difference between a distance from a top of the upper step to the center of the combustion chamber and a distance from the second arc line to the center of the combustion chamber is 6mm to 10 mm.
As a preferable technical solution of the above engine piston, the central boss is a frustum.
As a preferable technical scheme of the engine piston, the included angle of the central boss is 100-150 degrees.
As a preferable technical solution of the above engine piston, a top surface of the central boss is lower than a top surface of the piston.
The utility model also provides an engine, including the aforesaid engine piston.
The utility model also provides a vehicle, including the aforesaid the engine.
The utility model discloses beneficial effect:
the utility model discloses in, through the fourth pitch arc between first step and the second step in the same direction as smooth connection, can realize better drainage effect to the combustion chamber air, upper portion step, first step and second step fall into three region with the combustion chamber, and the fourth pitch arc is located the below of first step, and the fourth pitch arc can guide the gas that is located first step upper portion to first step and second step department, realizes effectively utilizing the combustion chamber air, further improves combustion efficiency, reduces the smoke carbon and discharges. The arrangement of the upper step can also increase the amount of fresh air at the top of the piston, so that the air and fuel oil are fully mixed at the part, the generation of soot is reduced, the oil-gas mixing process is further improved, and the generation amount of soot in the cylinder is reduced.
Drawings
Fig. 1 is a cross-sectional view of an engine piston according to an embodiment of the present invention.
In the figure:
1. a first arc line; 2. a first step straight line segment; 3. a second step straight line segment; 4. a second arc; 5. a third arc; 6. a fourth arc; 7. the bottom is a circular arc.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
As shown in fig. 1, the present embodiment provides an engine piston which is located on a top surface of the piston, and a combustion chamber which is circular and has an axial cross-section of "ω", the combustion chamber including: upper portion step, first step, second step, bottom circular arc 7 and central boss. The upper step is an annular surface of the combustion chamber in arc contact with the top surface of the piston, and the axial section of the upper step comprises a first arc line 1 with an arc center pointing to the outer side of the combustion chamber; the axial cross section of the first step comprises a first step straight line section 2 and a second arc line 4, the first step straight line section 2 is respectively connected with the first arc line 1 and the second arc line 4 in a smooth mode, the arc center of the second arc line 4 points to the outer side of the combustion chamber, the second step is located below the first step, the second step axial cross section comprises a second step straight line section 3 and a third arc line 5, the second arc line 4 and the second step straight line section 3 are connected in a smooth mode through a fourth arc line 6, the arc center of the third arc line 5 points to the outer side of the combustion chamber, a bottom arc 7 is located at the lower portion of the third arc line 5, and the bottom arc 7 is connected with the third arc line 5 in a smooth mode; the central boss is positioned in the center of the combustion chamber and is smoothly connected with the bottom arc 7. The arc center of the fourth arc 6 points to the inside of the combustion chamber.
In this implementation, through 6 smooth connections in the same direction as the sliding connection of fourth pitch arc between first step and the second step, can realize better drainage effect to the air in the combustion chamber, upper portion step, first step and second step divide into three region with the combustion chamber, and fourth pitch arc 6 is located the below of first step, fourth pitch arc 6 can guide the gas that is located first step upper portion to first step and second step department, the realization is to the effective utilization of air in the combustion chamber, further improve combustion efficiency, reduce the smoke and carbon and discharge. The arrangement of the upper step can also increase the amount of fresh air at the top of the piston, so that the air and fuel oil are fully mixed at the part, the generation of soot is reduced, the oil-gas mixing process is further improved, and the generation amount of soot in the cylinder is reduced.
Preferably, the first step straight-line segment 2 is arranged in parallel with the surface of the top of the piston, the included angle α between the second step straight-line segment 3 and the surface of the top of the piston is 3-20 degrees, preferably 3 degrees, 5 degrees, 10 degrees, 15 degrees or 20 degrees, and the second step straight-line segment 3 and the surface of the top of the piston are obliquely arranged, so that the second step straight-line segment 3 can play a certain drainage role on gas in a combustion chamber, the combustion efficiency of the combustion chamber is improved, and the smoke carbon emission is reduced.
Preferably, the first step height h1 is 6mm to 10mm, preferably 6mm, 7mm, 8mm, 9mm or 10mm, and the second step height h2 is 1mm to 3mm, preferably 1mm, 2mm or 3 mm. Can avoid in the combustion chamber gas short in first step residence time, combustion efficiency is poor, can also avoid in the combustion chamber gas long in second step residence time, influences the gas of first step department and enters into second step department.
Preferably, the distance from the second arc line 4 to the center of the combustion chamber is different from the distance from the third arc line 5 to the center of the combustion chamber by 6mm to 10mm, preferably 6mm, 7mm, 8mm, 9mm or 10mm, and the distance from the top of the upper step to the center of the combustion chamber is different from the distance from the second arc line 4 to the center of the combustion chamber by 6mm to 10mm, preferably 6mm, 7mm, 8mm, 9mm or 10 mm.
Preferably, the central boss is a frustum. The top surface of the central boss is lower than the top surface of the piston. The included angle of the central boss is 100-150 degrees, preferably 100 degrees, 110 degrees, 120 degrees, 130 degrees, 140 degrees or 150 degrees. The boss structure enables fuel and air mixed gas entering the bottom of the combustion chamber to climb in a stepped mode and move towards the center and the upper portion of the combustion chamber, and air in the center and the upper portion of the combustion chamber can be fully utilized.
The utility model also provides an engine, including the engine piston that provides in this embodiment. The combustion chamber of the engine can improve the combustion efficiency and reduce the smoke carbon emission of the engine in the working process.
The utility model also provides a vehicle, including the engine that provides in this embodiment.
In addition, the foregoing is only the preferred embodiment of the present invention and the technical principles applied thereto. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. An engine piston having a combustion chamber disposed at a top thereof, said combustion chamber comprising:
the upper step is an annular surface of a combustion chamber in arc contact with the top surface of the piston, and the axial section of the upper step comprises a first arc line (1) with the arc center pointing to the outer side of the combustion chamber;
the axial section of the first step comprises a first step straight line section (2) and a second arc line (4), the first step straight line section (2) is respectively connected with the first arc line (1) and the second arc line (4) smoothly, and the arc center of the second arc line (4) points to the outer side of the combustion chamber;
the second step is positioned below the first step, the axial section of the second step comprises a second step straight-line segment (3) and a third arc line (5), and the second arc line (4) and the second step straight-line segment (3) are smoothly connected through a fourth arc line (6);
a bottom arc (7) located at the lower part of the third arc (5), the bottom arc (7) being smoothly connected with the third arc (5);
the central boss is positioned in the center of the combustion chamber and is smoothly connected with the bottom arc (7).
2. The engine piston of claim 1, characterized in that the first step straight line segment (2) is arranged in parallel with the piston top surface and the second step straight line segment (3) is arranged at an angle of 3 ° to 20 ° to the piston top surface.
3. The engine piston of claim 1, wherein said first step height is between 6mm and 10 mm.
4. The engine piston of claim 1, wherein said second step height is between 1mm and 3 mm.
5. The engine piston of claim 1, characterized in that the distance from the second arc (4) to the center of the combustion chamber differs from the distance from the third arc (5) to the center of the combustion chamber by 6-10 mm, and the distance from the top of the upper step to the center of the combustion chamber differs from the distance from the second arc (4) to the center of the combustion chamber by 6-10 mm.
6. The engine piston of claim 1 wherein said central boss is a frustum of a cone.
7. The engine piston of claim 6, wherein said central boss includes an included angle of 100 ° to 150 °.
8. The engine piston of claim 1 wherein said top surface of said central boss is lower than said piston top surface.
9. An engine comprising an engine piston according to any one of claims 1 to 8.
10. A vehicle characterized by comprising the engine of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921650764.XU CN210858963U (en) | 2019-09-29 | 2019-09-29 | Engine piston, engine and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921650764.XU CN210858963U (en) | 2019-09-29 | 2019-09-29 | Engine piston, engine and vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210858963U true CN210858963U (en) | 2020-06-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921650764.XU Active CN210858963U (en) | 2019-09-29 | 2019-09-29 | Engine piston, engine and vehicle |
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| CN (1) | CN210858963U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114352431A (en) * | 2022-03-17 | 2022-04-15 | 潍柴动力股份有限公司 | Piston and engine |
| CN114526152A (en) * | 2022-04-22 | 2022-05-24 | 潍柴动力股份有限公司 | Combustion chamber and diesel engine |
| CN115324722A (en) * | 2022-10-14 | 2022-11-11 | 潍柴动力股份有限公司 | Combustion system and gas engine |
-
2019
- 2019-09-29 CN CN201921650764.XU patent/CN210858963U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114352431A (en) * | 2022-03-17 | 2022-04-15 | 潍柴动力股份有限公司 | Piston and engine |
| CN114352431B (en) * | 2022-03-17 | 2022-06-07 | 潍柴动力股份有限公司 | Piston and engine |
| WO2023174003A1 (en) * | 2022-03-17 | 2023-09-21 | 潍柴动力股份有限公司 | Piston and engine |
| CN114526152A (en) * | 2022-04-22 | 2022-05-24 | 潍柴动力股份有限公司 | Combustion chamber and diesel engine |
| CN115324722A (en) * | 2022-10-14 | 2022-11-11 | 潍柴动力股份有限公司 | Combustion system and gas engine |
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