CN213574386U - Steel piston of cooling oil cavity of groove type heat dissipation structure - Google Patents
Steel piston of cooling oil cavity of groove type heat dissipation structure Download PDFInfo
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- CN213574386U CN213574386U CN202022563843.6U CN202022563843U CN213574386U CN 213574386 U CN213574386 U CN 213574386U CN 202022563843 U CN202022563843 U CN 202022563843U CN 213574386 U CN213574386 U CN 213574386U
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Abstract
The utility model relates to a steel piston of slot type heat radiation structure cooling oil pocket belongs to piston technical field. The piston comprises a piston top and a piston skirt, a cavity A is arranged in the piston top, a cavity B is arranged in the piston skirt, the piston top is connected with the piston skirt, the cavity A and the cavity B form a closed annular cooling oil cavity, bulges are uniformly arranged on the inner side wall of the cooling oil cavity, the contact area of the cooling oil cavity and cooling oil is increased through the bulges, and the cooling effect is improved. The utility model discloses a heat radiating area of increase cooling oil pocket improves the cooling effect of piston, guarantees that the heat that the piston bore in time discharges.
Description
Technical Field
The utility model relates to a steel piston of slot type heat radiation structure cooling oil pocket belongs to piston technical field.
Background
The heat generated by the combustion process of the piston of the internal combustion engine is very high, forced cooling must be performed, and the unit area power of the engine of a lorry is more than 0.29kW/cm under the general condition2The unit piston area power of the medium-power marine diesel engine exceeds 0.15kW/cm2The piston needs to be cooled, and the piston needs to be oscillated and cooled to ensure that the heat born by the piston is exhausted.
The oscillating cooling is that an internal cooling oil cavity is arranged at the head of the piston, cooling engine oil is injected from an oil inlet hole at one side of the oil cavity and is discharged from an oil return hole at the opposite side, the cooling engine oil oscillates in the cooling oil cavity under the action of inertia force in the piston, the relative speed of the engine oil and the inner wall surface of the cooling oil cavity is higher, turbulence is formed, the heat exchange between a cooling medium and the inner wall surface is improved, and the heat dissipation area is one of factors influencing the heat exchange.
When fuel oil is combusted in the combustion chamber, the throat part of the combustion chamber is impacted by high-temperature and high-pressure fuel gas, and when the temperature of the piston exceeds 600 ℃, oxide skin is easily formed at the throat part of the combustion chamber, so that the throat part of the piston is cracked, the reliability of the piston is influenced, and the cooling of the throat part of the combustion chamber is particularly important.
The steel piston on the market at present has the interior cooling oil pocket of uniform cross section, and although the cooling effect is better, the heat radiating area of the interior cooling oil pocket of uniform cross section is little, along with the further promotion of detonation pressure and power, its radiating effect receives the restriction, and the heat that the burning produced can not be taken away by the cooling oil rapidly, and the thermal influence to piston ring groove, top and laryngeal opening increases.
Disclosure of Invention
The not enough to prior art, the utility model provides a steel piston of slot type heat radiation structure cooling oil pocket improves the cooling effect of piston through the heat radiating area who increases the cooling oil pocket, guarantees the heat that the piston bore in time discharges.
The technical scheme of the utility model as follows:
the utility model provides a steel piston of slot type heat radiation structure cooling oil pocket, includes piston crown and piston skirt, sets up chamber A in the piston crown, sets up chamber B in the piston skirt, and the piston crown is connected with the piston skirt, and inclosed annular cooling oil pocket is constituteed to chamber A and chamber B, evenly sets up the arch on the cooling oil pocket inside wall, through the area of contact of protruding increase cooling oil pocket and coolant oil, improves the cooling effect.
Preferably, the bulges are annular bulges and are uniformly arranged on the inner side wall of the cooling oil cavity adjacently, the adjacent annular bulges form annular grooves, the contact area of the cooling oil cavity and cooling oil is increased through the annular bulges and the annular grooves, and the cooling effect is improved.
Further preferably, the surface roughness of the annular protrusion and the annular groove is Ra1.6-Ra6.3.
Preferably, the bulges are uniformly arranged on the inner side wall of the cavity A in the piston top, so that the heat at the throat part of the combustion chamber is ensured to be taken away quickly, and the service life is prolonged.
Preferably, the piston top and the piston skirt are made of steel, the thermal load and the mechanical load borne by the piston are greatly increased on a highly-reinforced vehicle diesel engine or a marine engine, the traditional aluminum piston cannot meet the reliability requirement, and the steel piston is high in strength, high in high-temperature resistance and capable of meeting the reliability requirement.
When fuel oil of an engine is combusted in the combustion chamber, the temperature of the combustion chamber is rapidly increased, wherein the temperature of the throat part of the combustion chamber is highest, cooling oil is injected into the cooling oil cavity through the oil injection nozzle, and the throat part of the combustion chamber is cooled through heat exchange between the cooling wall surface of the cooling oil cavity and the cooling oil.
The manufacturing process of the utility model is as follows:
(1) the piston top and the piston skirt are respectively forged and formed;
(2) respectively processing the piston top and the piston skirt;
(3) the piston top and the piston skirt are connected in a positioning way through an inner welding surface;
(4) the inner and outer welding surfaces are welded simultaneously by friction welding and vacuum high-temperature brazing, or are welded twice by the main modes of laser welding and electron beam welding;
(5) and (6) finishing.
After finishing machining, a closed space is formed in a cooling oil cavity of the piston, cooling oil enters the cooling oil cavity and then oscillates, cooling of the top of the piston, the throat, the annular groove, the firepower bank and other parts is achieved, heat generated by fuel combustion is rapidly taken away, heat exchange of combustion heat is accelerated by increasing the heat dissipation area of the cooling oil cavity, the temperature of a combustion chamber, the throat, the top of the piston and the firepower bank is guaranteed to be within an allowable range, and the risk of fatigue breakage of important parts is effectively reduced.
The beneficial effects of the utility model reside in that:
1. the utility model discloses a heat radiating area of increase cooling oil pocket improves the cooling effect of piston, guarantees that the heat that the piston bore in time discharges.
2. The utility model discloses a cooling oil pocket adopts split type structure, adopts the mould forging respectively to take shape, workable.
3. The utility model discloses choose for use steel preparation, on high automobile-used diesel engine or marine engine of reinforceing, the heat load and the mechanical load that the piston bore increase substantially, traditional aluminium system piston can not satisfy the reliability requirement, and steel piston intensity is high, high temperature resistance is strong, satisfies the reliability requirement.
Drawings
FIG. 1 is a cross-sectional view of a piston crown according to the present invention;
fig. 2 is a schematic view of the piston top structure of the present invention;
FIG. 3 is a schematic structural view of the present invention;
wherein: 1. a piston top; 2. a piston skirt; 3. a cavity A; 4. a cavity B; 5. cooling the oil cavity; 6. a protrusion; 7. an annular groove; 8. a combustion chamber; 9. a laryngeal opening.
Detailed Description
The present invention will be further described, but not limited to, by the following examples in conjunction with the accompanying drawings.
Example 1:
as shown in fig. 1-3, the embodiment provides a steel piston with a cooling oil cavity having a groove-type heat dissipation structure, which includes a piston crown 1 and a piston skirt 2, wherein a cavity A3 is provided in the piston crown 1, a cavity B4 is provided in the piston skirt 2, the piston crown is connected with the piston skirt, a cavity A3 and a cavity B4 form a closed annular cooling oil cavity 5, protrusions 6 are uniformly provided on an inner side wall of the cooling oil cavity 5, a contact area between the cooling oil cavity and cooling oil is increased by the protrusions 6, and a cooling effect is improved.
The bulges 6 are annular bulges and are evenly arranged on the inner side wall of the cooling oil cavity adjacently, the adjacent annular bulges 6 form an annular groove 7, the contact area of the cooling oil cavity and cooling oil is increased through the annular bulges and the annular groove, and the cooling effect is improved.
The surface roughness of the annular protrusion and the annular groove is Ra1.6.
The bulges 6 are uniformly arranged on the inner side wall of the cavity A in the piston top, so that the heat at the throat 9 part of the combustion chamber 8 is ensured to be taken away quickly, and the service life is prolonged.
The piston top and the piston skirt are made of steel, on a highly-reinforced vehicle diesel engine or a marine engine, the heat load and the mechanical load borne by the piston are greatly increased, the traditional aluminum piston cannot meet the reliability requirement, and the steel piston is high in strength, strong in high-temperature resistance and capable of meeting the reliability requirement.
When fuel oil of an engine is combusted in the combustion chamber, the temperature of the combustion chamber is rapidly increased, wherein the temperature of the throat part of the combustion chamber is highest, cooling oil is injected into the cooling oil cavity through the oil injection nozzle, and the throat part of the combustion chamber is cooled through heat exchange between the cooling wall surface of the cooling oil cavity and the cooling oil.
The manufacturing process of the utility model is as follows:
(1) the piston top and the piston skirt are respectively forged and formed;
(2) respectively processing the piston top and the piston skirt;
(3) the piston top and the piston skirt are connected in a positioning way through an inner welding surface;
(4) the inner and outer welding surfaces are welded simultaneously by friction welding and vacuum high-temperature brazing, or are welded twice by the main modes of laser welding and electron beam welding;
(5) and (6) finishing.
After finishing machining, a closed space is formed in a cooling oil cavity of the piston, cooling oil enters the cooling oil cavity and then oscillates, cooling of the top of the piston, the throat, the annular groove, the firepower bank and other parts is achieved, heat generated by fuel combustion is rapidly taken away, heat exchange of combustion heat is accelerated by increasing the heat dissipation area of the cooling oil cavity, the temperature of a combustion chamber, the throat, the top of the piston and the firepower bank is guaranteed to be within an allowable range, and the risk of fatigue breakage of important parts is effectively reduced.
Example 2:
a steel piston having a channel heat-dissipating structure for cooling an oil chamber, the structure being as described in example 1, except that the surface roughness of the annular projection and the annular channel is Ra6.3.
Claims (5)
1. The steel piston is characterized by comprising a piston top and a piston skirt, wherein a cavity A is arranged in the piston top, a cavity B is arranged in the piston skirt, the piston top is connected with the piston skirt, the cavity A and the cavity B form a closed annular cooling oil cavity, and bulges are uniformly arranged on the inner side wall of the cooling oil cavity.
2. The steel piston for a cooling gallery with a grooved heat sink structure as claimed in claim 1 wherein the protrusions are annular protrusions, the protrusions being uniformly disposed adjacent to the inner side wall of the cooling gallery, the adjacent annular protrusions forming an annular groove.
3. The grooved heat sink cooling gallery steel piston of claim 2, wherein the surface roughness of the annular lands and grooves is Ra1.6-Ra6.3.
4. The channel heat sink cooling gallery steel piston of claim 1, wherein the lobes are uniformly disposed on the inside wall of gallery a within the piston crown.
5. The grooved heat sink cooling gallery steel piston of claim 1, wherein the crown and skirt are steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022563843.6U CN213574386U (en) | 2020-11-09 | 2020-11-09 | Steel piston of cooling oil cavity of groove type heat dissipation structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022563843.6U CN213574386U (en) | 2020-11-09 | 2020-11-09 | Steel piston of cooling oil cavity of groove type heat dissipation structure |
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| Publication Number | Publication Date |
|---|---|
| CN213574386U true CN213574386U (en) | 2021-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022563843.6U Active CN213574386U (en) | 2020-11-09 | 2020-11-09 | Steel piston of cooling oil cavity of groove type heat dissipation structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116517718A (en) * | 2023-06-27 | 2023-08-01 | 潍柴动力股份有限公司 | Piston, engine and piston design method |
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2020
- 2020-11-09 CN CN202022563843.6U patent/CN213574386U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116517718A (en) * | 2023-06-27 | 2023-08-01 | 潍柴动力股份有限公司 | Piston, engine and piston design method |
| CN116517718B (en) * | 2023-06-27 | 2023-10-20 | 潍柴动力股份有限公司 | Piston, engine and piston design method |
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