CN113982775A - Engine piston and two-stroke compression-ignition type aviation piston engine - Google Patents
Engine piston and two-stroke compression-ignition type aviation piston engine Download PDFInfo
- Publication number
- CN113982775A CN113982775A CN202111283219.3A CN202111283219A CN113982775A CN 113982775 A CN113982775 A CN 113982775A CN 202111283219 A CN202111283219 A CN 202111283219A CN 113982775 A CN113982775 A CN 113982775A
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- CN
- China
- Prior art keywords
- piston
- engine
- combustion chamber
- vortex
- pit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000002485 combustion reaction Methods 0.000 claims abstract description 52
- 239000000919 ceramic Substances 0.000 claims description 4
- 238000007745 plasma electrolytic oxidation reaction Methods 0.000 claims description 4
- 230000009977 dual effect Effects 0.000 claims description 2
- 230000002000 scavenging effect Effects 0.000 abstract description 6
- 239000000446 fuel Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 241001270131 Agaricus moelleri Species 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
Images
Classifications
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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
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/10—Pistons having surface coverings
- F02F3/12—Pistons having surface coverings on piston heads
- F02F3/14—Pistons having surface coverings on piston heads within combustion chambers
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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
- F02F3/24—Pistons having means for guiding gases in cylinders, e.g. for guiding scavenging charge in two-stroke engines
Abstract
The invention discloses an engine piston which comprises a piston body and a piston combustion chamber, wherein the piston combustion chamber comprises a diversion trench and a double-vortex pit which are arranged on the top surface of the piston body, and the diversion trench is communicated with the double-vortex pit. The engine piston disclosed by the invention adopts the shapes of the diversion trench and the double-vortex pit, and achieves the purposes of improving scavenging efficiency and improving flame propagation efficiency by reasonably arranging the positions of the cylinder cover precombustion chamber and the piston combustion chamber, thereby improving the dynamic property and the economical efficiency of the engine. The invention also discloses a two-stroke compression-ignition aviation piston engine.
Description
Technical Field
The invention belongs to the technical field of internal combustion engines, and particularly relates to an engine piston and a two-stroke compression-ignition type aviation piston engine.
Background
As a two-stroke piston engine applied to the aviation field, the requirements for power-to-weight ratio, reliability, and fuel economy have more severe performance index requirements than those of two-stroke piston engines applied to chain saws, mobile small generator sets, and the like, and therefore, technical improvements are required to be made on fuel economy, emission regulations and performance convenience to meet the requirements of customers and markets.
Combustion optimization is always used as a main measure for improving the output power of the two-stroke engine and improving the fuel economy. Measures commonly adopted for optimizing combustion include increasing air intake amount, optimizing the shape of a combustion chamber, adjusting the oil inlet amount of an oil injector and the like, wherein the optimization of the shape of the combustion chamber to improve the sufficient mixing of air flow movement and fuel is a measure which is relatively simple to operate and relatively low in cost.
Two-stroke engines, which are compression-ignition scavenged, often employ a split combustion chamber, i.e., the combustion chamber is clearly split into two parts: one part is used as a precombustion chamber and arranged in the cylinder head, the other part consists of a piston top surface and a cylinder head bottom surface and is called a main combustion chamber, and the main combustion chamber is connected with the precombustion chamber through a connecting channel on a cylinder head precombustion chamber insert. In order to ensure that the airflow rotates in a certain direction in the main combustion chamber to promote the propagation of flame in the main combustion chamber and improve the scavenging efficiency of fresh air on combustion waste gas, and is influenced by the ratio of the volume of the precombustion chamber to the volume of the total combustion chamber, the top of the piston is provided with combustion chambers of different shapes according to the falling point of the connecting channel on the top of the piston, wherein the combustion chambers comprise a heart-shaped combustion chamber, a flat-top combustion chamber, a ball-top combustion chamber and the like; the reasonable design of the piston combustion chamber directly determines the propagation of the flame of the precombustion chamber in the main combustion chamber and the scavenging efficiency of fresh air to combustion waste gas, thereby influencing the dynamic property and the economical efficiency of the two-stroke engine.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides an engine piston, aiming at improving the dynamic property and the economical efficiency of an engine.
In order to achieve the purpose, the invention adopts the technical scheme that: the engine piston comprises a piston body and a piston combustion chamber, wherein the piston combustion chamber comprises a guide groove and a double-vortex pit which are arranged on the top surface of the piston body, and the guide groove is communicated with the double-vortex pit.
The double-vortex pit is 8-shaped, and the diversion trench is positioned at the necking part of the double-vortex pit.
And a micro-arc oxidation ceramic film layer is arranged on the top surface of the piston body.
The dual vortex pockets are offset on the top surface of the piston body.
The invention also provides a two-stroke compression-ignition aviation piston engine which comprises the engine piston.
The engine piston disclosed by the invention adopts the shapes of the diversion trench and the double-vortex pit, and achieves the purposes of improving scavenging efficiency and improving flame propagation efficiency by reasonably arranging the positions of the cylinder cover precombustion chamber and the piston combustion chamber, thereby improving the dynamic property and the economical efficiency of the engine.
Drawings
The description includes the following figures, the contents shown are respectively:
FIG. 1 is a schematic illustration of the construction of an engine piston according to the present invention;
FIG. 2 is a cross-sectional view of a cylinder head and engine piston;
labeled as: 1. a cylinder head; 2. a vortex prechamber center; 3. a connecting channel; 4. a piston combustion chamber; 5. a piston body; 6. a diversion trench; 7. double eddy current pits.
Detailed Description
The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings for a purpose of helping those skilled in the art to more fully, accurately and deeply understand the concept and technical solution of the present invention and to facilitate its implementation.
As shown in fig. 1 and 2, the present invention provides an engine piston, comprising a piston body 5 and a piston combustion chamber 4, wherein the piston combustion chamber 4 comprises a diversion trench 6 and a double-vortex pit 7 arranged on the top surface of the piston body 5, and the diversion trench 6 is communicated with the double-vortex pit 7.
Specifically, as shown in fig. 1, the double-swirl pit 7 is in an 8 shape, the guide groove 6 is located at the necking part of the double-swirl pit 7, and the length direction of the guide groove 6 is perpendicular to the axis of the piston body 5 and the length direction of the double-swirl pit 7. The main combustion chamber is arranged at the top of the piston, the shape of the diversion trench 6+ the double-vortex pit 7 is adopted, the scavenging efficiency is improved and the flame propagation efficiency is improved by reasonably arranging the positions of the cylinder cover precombustion chamber and the piston combustion chamber 4, so that the purpose of improving the dynamic property and the economical efficiency of the engine is achieved, and through experimental comparison, the power of the two-stroke engine optimized according to the scheme is improved by 42.86 percent, the oil consumption is reduced by 10 percent, and the two-stroke engine has better market competitiveness.
As shown in fig. 1, the double-vortex pit 7 is offset on the top surface of the piston body 5, one end of the guide groove 6 is connected with the double-vortex pit 7, the center of the piston body 5 is located in the area of the double-vortex pit 7, and the center of the piston body 5 and the guide groove 6 are located on the same straight line perpendicular to the length direction of the double-vortex pit 7.
Considering the reasonable moving direction of the air flow in the cylinder and the reasonability of the connecting position of the air flow and the cylinder head precombustion chamber in the combustion and scavenging processes, the position of the piston combustion chamber 4 adopts an arrangement mode deviating from the center of the piston, the guide groove 6 of the piston combustion chamber 4 is correspondingly connected with the connecting channel 3 on the cylinder head precombustion chamber insert, and the guide groove 6 is set to be a straight groove in order to adapt to high speed. According to the state, when the piston is arranged near the top dead center, high-temperature fuel gas, air and natural fuel sprayed out of the pre-combustion chamber of the cylinder cover are divided into two parts by the guide groove 6, and two strong vortexes are formed under the guide effect of the double-vortex pit 7; as the piston descends, the two vortices break away from the recess of the piston combustion chamber 4, extending throughout the main combustion chamber, thereby enhancing mixing and combustion in the main combustion chamber.
As shown in fig. 1 and 2, a pre-combustion chamber and a connecting passage 3 are provided inside the cylinder head, a piston combustion chamber 4 is connected with the pre-combustion chamber through the connecting passage 3, and the connecting passage 3 connecting the main combustion chamber with the pre-combustion chamber is correspondingly connected with a flow guide groove 6. The cross section area of the connecting channel 3 is 1.2-1.5% of the area of the piston combustion chamber 4, and the volume ratio of the precombustion chamber to the piston combustion chamber 4 is controlled at 50%. The piston combustion chamber 4 can be used for a high-speed two-stroke compression-ignition aviation piston engine with the cylinder diameter of less than 95 mm.
In order to ensure the consistency of products, the piston combustion chamber 4 on the top of the piston body 5 is formed by adopting mold precasting, and simultaneously, in order to prevent the problems of high-temperature cracking and burning of the piston on the top surface of the piston, the top surface of the piston can adopt micro-arc oxidation and ceramic treatment, so that a micro-arc oxidation ceramic film layer is formed on the top surface of the piston body 5, has high-temperature resistance, and can improve the high-temperature resistance of the top surface of the piston and the piston combustion chamber 4.
The invention also provides a two-stroke compression-ignition aviation piston engine which comprises the engine piston with the structure. The specific structure of the engine piston can refer to fig. 1 and 2, and is not described in detail herein. The two-stroke compression-ignition aviation piston engine of the present invention has all the advantages of the engine piston described above, since it includes the engine piston in the above embodiments.
The invention is described above with reference to the accompanying drawings. It is to be understood that the specific implementations of the invention are not limited in this respect. Various insubstantial improvements are made by adopting the method conception and the technical scheme of the invention; the present invention is not limited to the above embodiments, and can be modified in various ways.
Claims (5)
1. Engine piston, including piston body and piston combustion chamber, its characterized in that: the piston combustion chamber comprises a guide groove and a double-vortex pit which are arranged on the top surface of the piston body, and the guide groove is communicated with the double-vortex pit.
2. The engine piston of claim 1, wherein: the double-vortex pit is 8-shaped, and the diversion trench is positioned at the necking part of the double-vortex pit.
3. The engine piston of claim 1 or 2, wherein: and a micro-arc oxidation ceramic film layer is arranged on the top surface of the piston body.
4. The engine piston of claim 1 or 2, wherein: the dual vortex pockets are offset on the top surface of the piston body.
5. The two-stroke compression-ignition type aviation piston engine is characterized in that: comprising an engine piston according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111283219.3A CN113982775A (en) | 2021-11-01 | 2021-11-01 | Engine piston and two-stroke compression-ignition type aviation piston engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111283219.3A CN113982775A (en) | 2021-11-01 | 2021-11-01 | Engine piston and two-stroke compression-ignition type aviation piston engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113982775A true CN113982775A (en) | 2022-01-28 |
Family
ID=79745403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111283219.3A Pending CN113982775A (en) | 2021-11-01 | 2021-11-01 | Engine piston and two-stroke compression-ignition type aviation piston engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113982775A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4881501A (en) * | 1988-02-03 | 1989-11-21 | Nissan Motor Co., Ltd. | Diesel engine having shaped flame dispersing recess in piston crown |
| CN102251845A (en) * | 2011-06-23 | 2011-11-23 | 常州常发动力机械有限公司 | Combustion system of vortex-type diesel engine |
| CN105089771A (en) * | 2015-08-25 | 2015-11-25 | 江苏江淮动力股份有限公司 | Swirl chamber engine |
| CN206860306U (en) * | 2017-06-02 | 2018-01-09 | 江苏常发农业装备股份有限公司 | A kind of engine and its piston with turbulence chamber |
| CN110747498A (en) * | 2019-12-02 | 2020-02-04 | 广西玉柴机器股份有限公司 | High-temperature-resistant light aluminum alloy piston of internal combustion engine and preparation method thereof |
-
2021
- 2021-11-01 CN CN202111283219.3A patent/CN113982775A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4881501A (en) * | 1988-02-03 | 1989-11-21 | Nissan Motor Co., Ltd. | Diesel engine having shaped flame dispersing recess in piston crown |
| CN102251845A (en) * | 2011-06-23 | 2011-11-23 | 常州常发动力机械有限公司 | Combustion system of vortex-type diesel engine |
| CN105089771A (en) * | 2015-08-25 | 2015-11-25 | 江苏江淮动力股份有限公司 | Swirl chamber engine |
| CN206860306U (en) * | 2017-06-02 | 2018-01-09 | 江苏常发农业装备股份有限公司 | A kind of engine and its piston with turbulence chamber |
| CN110747498A (en) * | 2019-12-02 | 2020-02-04 | 广西玉柴机器股份有限公司 | High-temperature-resistant light aluminum alloy piston of internal combustion engine and preparation method thereof |
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Application publication date: 20220128 |