CN217841845U - Aluminum piston for high-temperature working condition gas engine - Google Patents
Aluminum piston for high-temperature working condition gas engine Download PDFInfo
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- CN217841845U CN217841845U CN202221499808.5U CN202221499808U CN217841845U CN 217841845 U CN217841845 U CN 217841845U CN 202221499808 U CN202221499808 U CN 202221499808U CN 217841845 U CN217841845 U CN 217841845U
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Abstract
The utility model provides an aluminum piston for high temperature operating mode gas engine, includes the piston body, and the top of piston body is provided with the combustion chamber, is equipped with in proper order on the upper portion outer wall of piston body for three annular, its characterized in that: the piston is characterized in that a cooling oil cavity is formed in the piston body, between the annular groove and the fuel oil chamber, the top of the piston body and the inner surface of the combustion chamber are provided with thermal protection coatings, and a skirt pin boss of the piston body is provided with a copper bush, an oil inlet hole and an oil outlet hole which are communicated with the cooling oil cavity. The utility model has the advantages of reasonable design, have that cooling efficiency is high, with low costs, long service life.
Description
Technical Field
The utility model belongs to the technical field of the internal-combustion engine, a high temperature operating mode aluminum piston for gas engine is related to.
Background
Because the thermal load of the gas engine is higher, the piston of the gas engine generally adopts a steel top aluminum skirt, a steel top iron skirt or a steel piston, the cost is higher than that of the aluminum piston, the motion inertia of a piston group is larger due to the heavier mass of the gas engine, the mechanical load of the gas engine is higher, the reliability of the gas engine is reduced, and the fuel consumption is higher.
The high temperature environment of gas engine operation makes its piston face severe thermal shock resistance and cooling problem. Under the high-temperature working condition, the instantaneous temperature of the throat of the combustion chamber of the gas engine piston exceeds 420 ℃ and exceeds the limit service temperature of the piston aluminum alloy, the top of the conventional aluminum alloy piston can be locally melted under the impact of high-temperature gas, so that the piston deforms and even breaks, and serious accidents such as cylinder scuffing or cylinder explosion of an engine are caused.
According to the investigation, the traditional Chinese patent CN201620236235.5, namely a gas engine piston, comprises an inner cooling oil duct and three ring grooves, wherein the three ring grooves are sequentially distributed into a first ring groove, a second ring groove and a third ring groove from the top of the piston downwards, the inner cooling oil duct is arranged in the piston, the first ring groove is arranged at a position which is level with the bottom of a combustion chamber of the piston, and the inner cooling oil duct is of a wave-shaped ring structure. The piston improves the heat dissipation efficiency and reduces the thermal stress of the piston, but the structural design is not ideal enough, and further improvement on the aspect of cooling efficiency is needed.
Disclosure of Invention
The utility model aims to solve the technical problem that to foretell technical current situation and provide a rational in infrastructure, cooling efficiency is high, long service life's high temperature operating mode aluminum piston for gas engine.
The utility model provides a technical scheme that above-mentioned technical problem adopted does: the utility model provides an aluminum piston for high temperature operating mode gas engine, includes the piston body, and the top of piston body is provided with the combustion chamber, is equipped with in proper order on the upper portion outer wall of piston body for three annular, its characterized in that: the piston is characterized in that a cooling oil cavity is formed in the piston body, between the annular groove and the fuel oil chamber, the top of the piston body and the inner surface of the combustion chamber are provided with thermal protection coatings, and a skirt pin boss of the piston body is provided with a copper bush, an oil inlet hole and an oil outlet hole which are communicated with the cooling oil cavity.
As an improvement, the cooling oil cavity is positioned in the middle between the annular groove and the combustion chamber, the upper end of the cooling oil cavity is not lower than the height of the first annular groove in the annular groove, the lower end of the cooling oil cavity is positioned between the second annular groove and the third annular groove, the height of the first annular groove is higher than the bottom of the combustion chamber, and the height of the second annular groove is close to the bottom of the combustion chamber.
Further, the thermal protection coating is a ceramic oxide film formed by adopting a micro-arc oxidation process, or an Al-Cu-Fe quasi-crystal layer formed by adopting a supersonic flame spraying process, and the throat of the combustion chamber is provided with an aluminum-based composite material.
Furthermore, the aluminum-based composite material is an aluminum oxide short fiber reinforced composite material, an aluminum borate whisker reinforced composite material or a boron carbide particle reinforced composite material, and the aluminum oxide short fiber reinforced aluminum-based composite material is arranged at the first ring groove of the piston body.
Further, a pin hole is radially formed in the pin seat at the lower end of the piston body, and the copper bush is assembled in the pin hole through an embedding process.
Furthermore, the oil inlet hole and the oil outlet hole are locally intersected with the pin hole of the piston body and communicated with the cooling oil cavity and the copper bush.
And finally, the piston body is made of aluminum-silicon alloy materials by adopting an extrusion casting process.
Compared with the prior art, the utility model has the advantages of: the thermal protection coatings are arranged on the top of the piston and the position of the combustion chamber, so that the thermal shock effect of high-temperature gas generated by combustion on the top of the piston is relieved, and the throat part and the first ring groove part of the combustion chamber with the highest working temperature of the piston are enhanced by adopting an aluminum-based composite material, so that the high-temperature ablation resistance of the parts is improved, and the reliability of the aluminum piston under a high-temperature working condition is improved; the cooling oil cavity is arranged between the first ring groove and the combustion chamber in the piston, the top surface of the piston, the throat of the combustion chamber and the first ring groove are effectively cooled by the cooling oil cavity, meanwhile, the oil inlet hole and the oil outlet hole are communicated with the cooling oil cavity and the copper bush, heat of the copper bush can be taken away by engine oil in the cooling circulation process, the temperature around the copper bush is reduced, the heat load of a piston pin hole is further reduced, and the service life of the piston is prolonged. The utility model has the advantages of reasonable design, have that cooling efficiency is high, with low costs, long service life.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
fig. 2 is a top view of the structure of fig. 1.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
As shown in figures 1 and 2, the aluminum piston for the high-temperature working condition gas engine comprises a piston body 1, a combustion chamber 11 is arranged at the top of the piston body 1, a pin boss is arranged at the lower end of the piston body 1, three ring grooves 13, 14 and 15 are sequentially arranged on the outer wall of the upper portion of the piston body 1, a cooling oil cavity 12 is arranged between each of the ring grooves 13, 14 and 15 and the fuel chamber 11 in the piston body 1, a thermal protection coating 3 is arranged on the inner surfaces of the top of the piston body 1 and the combustion chamber 11, and a copper bush 2, an oil inlet hole 16 communicated with the cooling oil cavity 12 and an oil outlet hole 17 are arranged at the pin boss of the piston body 1.
The concrete structure is as follows: the piston body 1 is made of an aluminum-silicon alloy material by adopting an extrusion casting process, a cooling oil cavity 12 is positioned in the middle positions among annular grooves 13, 14 and 15 and a combustion chamber 11, the upper end of the cooling oil cavity 12 is not lower than the height of a first annular groove 13, the lower end of the cooling oil cavity 12 is positioned between a second annular groove 14 and a third annular groove 15, the height of the first annular groove 13 is higher than the bottom position of the combustion chamber 11, and the height of the second annular groove 14 is close to the height of the bottom of the combustion chamber 11. The thermal protection coating 3 is a ceramic oxide film formed by adopting a micro-arc oxidation process or an Al-Cu-Fe quasi-crystal layer formed by adopting a supersonic speed flame spraying process, and the throat of the combustion chamber 11 is provided with an aluminum-based composite material 4. The aluminum-based composite material 4 is an aluminum oxide short fiber reinforced composite material, an aluminum borate whisker reinforced composite material or a boron carbide particle reinforced composite material, and the aluminum oxide short fiber reinforced aluminum-based composite material is arranged at the first ring groove 13 of the piston body 1, so that the aluminum-based composite material 4 is adopted to reinforce the throat part of the combustion chamber and the first ring groove 13 with the highest working temperature of the piston, the high-temperature ablation resistance of the parts is improved, and the reliability of the aluminum piston under the high-temperature working condition is improved. A pin hole is radially formed in a pin boss at the lower end of the piston body 1, and the copper bush 2 is assembled in the pin hole through an embedding process. The oil inlet hole 16 and the oil outlet hole 17 are locally intersected with the pin hole of the piston body 1 and communicated with the cooling oil cavity 12 and the copper bush 2, so that the heat of the copper bush 2 can be taken away by engine oil in the cooling circulation process, the temperature around the copper bush 2 is reduced, the heat load of the pin hole of the piston is further reduced, and the service life of the piston is prolonged.
In the embodiment, the aluminum-based composite material 4 is adopted to reinforce the throat part of the combustion chamber 11 and the first ring groove 13 with the highest working temperature of the piston, so that the high-temperature ablation resistance of the parts is improved, and meanwhile, the thermal shock effect of high-temperature gas generated by combustion on the top of the piston is relieved by generating the thermal protection coating 3 on the top of the piston and the combustion chamber 11, so that the reliability of the aluminum piston under a high-temperature working condition is improved; the cooling oil cavity 12 is arranged between the first ring groove 13 and the combustion chamber 11 at the top of the piston, the top surface of the piston, the throat of the combustion chamber 11 and the first ring groove 13 are effectively cooled by the cooling oil cavity 12, meanwhile, the oil inlet hole 16 and the oil outlet hole 17 are communicated with the cooling oil cavity 12 and the copper bush 2, heat of the copper bush 2 can be taken away by engine oil in the cooling circulation process, the temperature around the copper bush 2 is reduced, the heat load of a piston pin hole is further reduced, and the service life of the piston is prolonged.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. The utility model provides a high temperature operating mode is aluminium piston for gas engine, includes piston body, and piston body's top is provided with the combustion chamber, is equipped with in proper order on piston body's the upper portion outer wall to be three annular, its characterized in that: the piston is characterized in that a cooling oil cavity is formed in the piston body, between the annular groove and the fuel oil chamber, the top of the piston body and the inner surface of the combustion chamber are provided with thermal protection coatings, and a skirt pin boss of the piston body is provided with a copper bush, an oil inlet hole and an oil outlet hole which are communicated with the cooling oil cavity.
2. The aluminum piston for the high-temperature working condition gas engine as recited in claim 1, wherein: the cooling oil cavity is radially located in the middle between the annular groove and the combustion chamber, the height of the first annular groove in the annular groove is not lower than the upper end of the cooling oil cavity, the lower end of the cooling oil cavity is located between the second annular groove and the third annular groove, the height of the first annular groove is higher than the bottom of the combustion chamber, and the height of the second annular groove is close to the bottom of the combustion chamber.
3. The aluminum piston for the high-temperature working condition gas engine as recited in claim 1, wherein: the thermal protection coating is a ceramic oxide film formed by adopting a micro-arc oxidation process or an Al-Cu-Fe quasi-crystal layer formed by adopting a supersonic speed flame spraying process, and the throat of the combustion chamber is provided with an aluminum-based composite material.
4. The aluminum piston for the high-temperature working condition gas engine as recited in claim 3, wherein: the aluminum-based composite material is an aluminum oxide short fiber reinforced composite material, an aluminum borate whisker reinforced composite material or a boron carbide particle reinforced composite material, and the aluminum oxide short fiber reinforced aluminum-based composite material is arranged at the first ring groove of the piston body.
5. The aluminum piston for the high-temperature working condition gas engine as recited in claim 1, wherein: the piston is characterized in that a pin hole is radially formed in a pin boss at the lower end of the piston body, and the copper bush is assembled in the pin hole through an embedding process.
6. The aluminum piston for the high-temperature working condition gas engine as recited in claim 5, wherein: the oil inlet hole and the oil outlet hole are locally intersected with the pin hole of the piston body and are communicated with the cooling oil cavity and the copper bush.
7. The aluminum piston for the high-temperature working condition gas engine as recited in any one of claims 1 to 6, wherein: the piston body is made of aluminum-silicon alloy materials by adopting an extrusion casting process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221499808.5U CN217841845U (en) | 2022-06-15 | 2022-06-15 | Aluminum piston for high-temperature working condition gas engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221499808.5U CN217841845U (en) | 2022-06-15 | 2022-06-15 | Aluminum piston for high-temperature working condition gas engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217841845U true CN217841845U (en) | 2022-11-18 |
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ID=84023891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221499808.5U Active CN217841845U (en) | 2022-06-15 | 2022-06-15 | Aluminum piston for high-temperature working condition gas engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217841845U (en) |
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2022
- 2022-06-15 CN CN202221499808.5U patent/CN217841845U/en active Active
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