CN217873036U - High-efficiency oscillation cooling piston - Google Patents
High-efficiency oscillation cooling piston Download PDFInfo
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- CN217873036U CN217873036U CN202221814702.XU CN202221814702U CN217873036U CN 217873036 U CN217873036 U CN 217873036U CN 202221814702 U CN202221814702 U CN 202221814702U CN 217873036 U CN217873036 U CN 217873036U
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Abstract
The utility model discloses a high-efficient vibration cooling piston, include: the piston top and the piston skirt are fixedly connected to form an oscillation cooling outer cavity and an oscillation cooling inner cavity, an upper communicating hole and a lower communicating hole are communicated between the oscillation cooling outer cavity and the oscillation cooling inner cavity, the upper communicating holes and the lower communicating holes are respectively distributed in the circumferential direction, the upper communicating hole is positioned above the lower communicating hole, the oscillation cooling outer cavity is provided with a plurality of oil inlet holes distributed in the circumferential direction, and an oil return hole is arranged in the oscillation cooling inner cavity; and cooling grooves are distributed on the top surfaces of the oscillation cooling outer cavity and the oscillation cooling inner cavity. When the piston reciprocates fast, the engine oil oscillates repeatedly in the oscillation cooling outer cavity and the oscillation cooling inner cavity, and the surfaces of the oscillation cooling outer cavity and the oscillation cooling inner cavity are washed and cooled repeatedly, so that no dead angle exists in cooling.
Description
Technical Field
The utility model relates to a diesel engine technical field, specific theory relates to a high-efficient vibration cooling piston.
Background
With the continuous improvement of the average effective pressure and power of the diesel engine, the heat load of the piston is greatly increased, and the cooling of the piston becomes a difficult point of design; the serious malignant faults of piston top cracking, engine oil aging and the like caused by cylinder scuffing and overlarge thermal stress can occur due to insufficient cooling of the piston.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned not enough, the utility model discloses the technical problem that will solve is: the high-efficiency oscillation cooling piston with high oscillation cooling efficiency is provided, and the cooling effect of the piston is improved.
In order to solve the technical problem, the technical scheme of the utility model is that:
a high efficiency, oscillatory cooling piston comprising: the piston crown and the piston skirt are fixedly connected to form an oscillation cooling outer cavity and an oscillation cooling inner cavity,
an upper communicating hole and a lower communicating hole are communicated between the oscillation cooling outer cavity and the oscillation cooling inner cavity, the upper communicating holes and the lower communicating holes are circumferentially distributed respectively, the upper communicating hole is positioned above the lower communicating hole, the oscillation cooling outer cavity is provided with a plurality of circumferentially distributed oil inlet holes, and an oil return hole is arranged in the oscillation cooling inner cavity;
and cooling grooves are distributed on the top surfaces of the oscillation cooling outer cavity and the oscillation cooling inner cavity.
Preferably, the upper communication hole is an inclined hole with a high outer part and a low inner part.
Preferably, the thickness of the top wall of the piston top is 10 mm-15 mm.
Preferably, the cooling groove is an arc groove, the radius of the cooling groove is R, R is larger than or equal to 3mm and smaller than or equal to 5mm, the depth of the cooling groove is D, and D is larger than or equal to 2mm and smaller than or equal to 3mm.
Preferably, the oil return hole is arranged on the bottom surface of the oscillation cooling inner cavity in a protruding mode.
Preferably, the height of the oscillating cooling cavity is H1, the protruding height of the oil return hole is H2, and H2 is more than or equal to 1/4H1 and less than or equal to 2/5H1.
Preferably, the lower communication hole has a height lower than that of the oil return hole.
Preferably, each oil inlet is communicated with an oil inlet channel, the lower end of each oil inlet channel is communicated with the oil inlet groove of the piston pin boss, the sum of the areas of the through-flow sections of all the oil inlet channels is phi 1, the sum of the areas of the through-flow sections of all the lower communication holes is phi 2, and phi 2 is not less than 1.5 phi 1.
Preferably, the area of the through-flow section of the oil return hole is phi 3,3.5 phi 1 is more than or equal to phi 3 and less than or equal to 5 phi 1.
Preferably, the piston pin boss oil inlet grooves are formed in the piston pin bosses of the piston skirt, the piston pin boss oil inlet grooves are arranged around the piston pins, the piston pins are provided with four piston pin oil inlet channels, the piston pin boss oil inlet grooves are communicated with the three piston pin oil inlet channels simultaneously, and the main pressure bearing angle theta of the piston pin bosses is larger than or equal to 60 degrees.
After the technical scheme is adopted, the beneficial effects of the utility model are that:
because the double rows of communicating holes which are arranged up and down are arranged between the oscillation cooling outer cavity and the oscillation cooling inner cavity, the upper communicating hole is used for communicating the upper parts of the two oscillation cooling cavities, the lower communicating hole is used for communicating the lower parts of the two oscillation cooling cavities, the engine oil enters the oscillation cooling outer cavity from the oil inlet hole and then flows into the oscillation cooling inner cavity through the upper communicating hole and the lower communicating hole, when the piston rapidly reciprocates, the engine oil repeatedly oscillates in the oscillation cooling outer cavity and the oscillation cooling inner cavity and repeatedly scours and cools the surfaces of the oscillation cooling outer cavity and the oscillation cooling inner cavity, no dead angle exists in cooling, meanwhile, the hole surfaces of the upper communicating hole and the lower communicating hole are also heat exchange surfaces of the engine oil cooling piston, the heat exchange area is increased, and the cooling effect of the piston is good.
Drawings
FIG. 1 is a schematic cross-sectional view of an embodiment of a high efficiency oscillating cooling piston according to the present invention;
FIG. 2 is a schematic cross-sectional view of another embodiment of the high efficiency oscillating cooling piston of the present invention;
FIG. 3 isbase:Sub>A schematic sectional view taken along line A-A in FIG. 2;
FIG. 4 is a schematic view of the connection between the piston crown and the piston skirt of an embodiment of the high efficiency oscillating cooling piston of the present invention;
FIG. 5 is an enlarged schematic view of the portion B of FIG. 2;
in the figure: 1. a piston top; 2. a piston skirt; 3. a piston pin; 4. an oscillating cooled outer chamber; 5. oscillating to cool the inner cavity; 6. an upper communication hole; 7. a lower communication hole; 8. an oil return hole; 9. cooling the groove; 10. a bolt; 11. an oil inlet channel; 12. a piston pin boss oil inlet groove; 13. piston pin oil inlet channel.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown collectively in fig. 1-4, a high efficiency, oscillatingly cooled piston, comprising: the piston comprises a piston crown 1, a piston skirt 2 and a piston pin 3, wherein the piston pin 3 is arranged on a piston pin boss of the piston skirt 2, the piston crown 1 and the piston skirt 2 are fixedly connected through a plurality of circumferentially distributed bolts 10, and an oscillation cooling outer cavity 4 and an oscillation cooling inner cavity 5 are formed after the piston crown 1 and the piston skirt 2 are fixedly connected;
an upper communicating hole 6 and a lower communicating hole 7 are communicated between the oscillation cooling outer cavity 4 and the oscillation cooling inner cavity 5, the upper communicating holes 6 and the lower communicating holes 7 are respectively distributed in the circumferential direction, the upper communicating hole 6 is positioned above the lower communicating hole 7, the oscillation cooling outer cavity 4 is provided with a plurality of oil inlet holes distributed in the circumferential direction, and an oil return hole 8 is arranged in the lower communicating hole 7;
the top surfaces of the oscillation cooling outer cavity 4 and the oscillation cooling inner cavity 5 are distributed with cooling grooves 9 for increasing the heat exchange area.
The double rows of communicating holes which are arranged up and down are arranged between the oscillation cooling outer cavity 4 and the oscillation cooling inner cavity 5, the upper communicating hole 6 is used for communicating the upper parts of the two oscillation cooling cavities, the lower communicating hole 7 is used for communicating the lower parts of the two oscillation cooling cavities, engine oil enters the oscillation cooling outer cavity 4 from an oil inlet hole and then flows into the oscillation cooling inner cavity 5 through the upper communicating hole 6 and the lower communicating hole 7, when the piston rapidly reciprocates, the engine oil repeatedly oscillates in the oscillation cooling outer cavity 4 and the oscillation cooling inner cavity 5 and repeatedly scours the surfaces of the oscillation cooling outer cavity 4 and the oscillation cooling inner cavity 5, no dead angle is caused in cooling, the upper communicating hole 6 and the lower communicating hole 7 are arranged, the engine oil can smoothly flow into the oscillation cooling inner cavity 5 no matter the engine oil oscillates to the upper part or the lower part of the oscillation cooling outer cavity 4, and the flowability of the engine oil is good; meanwhile, the hole surfaces of the upper communicating hole 6 and the lower communicating hole 7 are also heat exchange surfaces of the engine oil cooling piston, so that the heat exchange area is increased, the upper communicating hole 6 is obliquely arranged in a high-inside mode, the heat exchange area is further increased, and the inclined holes are easy to machine; moreover, the bolt 10 passes through the upper communicating hole 6 and the lower communicating hole 7, so that the bolt 10 and the periphery of the bolt are cooled effectively, the thermal deformation of the bolt hole and the bolt 10 is effectively avoided, the bolt is connected firmly and reliably, and the phenomenon that the piston is jacked off and a major fault is caused due to the fact that the bolt 10 loses efficacy and becomes loose is avoided.
The temperature of the piston top 1 is too high, which can cause overheating aging and even carbonization of engine oil, therefore, under the condition that the thermal fatigue strength of the piston top 1 allows, the thickness of the top wall of the piston top 1 should be large to prevent the engine oil from aging, reduce the heat conduction consumption, improve the thermal efficiency of the diesel engine, and reduce the oil consumption, in the embodiment, the thickness of the top wall of the piston top 1 is controlled between 10mm and 15mm, the top wall of the piston top 1 comprises a top wall at an oscillation cooling outer cavity 4, a top wall at an oscillation cooling inner cavity 5, a top wall at the outer end of an upper communication hole 6 and a top wall at the side part of the oscillation cooling outer cavity 4, the thickness of the top wall T1 at the oscillation cooling outer cavity 4 is more than or equal to 10mm and less than or equal to 15mm, the thickness of the top wall T2 at the oscillation cooling inner cavity 5 is more than or equal to 10mm and less than or equal to 15mm, the thickness of the top wall at the outer end of the upper communication hole 6 is more than or equal to 10mm and less than or equal to 15mm, the thickness of the top wall T4 at the side part of the oscillation cooling outer cavity 4 is more than or equal to 10mm and less than or equal to 15mm.
The cooling groove 9 is an arc groove, the radius of the cooling groove 9 is R, R is more than or equal to 3mm and less than or equal to 5mm, the depth of the cooling groove is D, and D is more than or equal to 2mm and less than or equal to 3mm.
In order to obtain a high-efficiency cooling effect, the height H1 of the oscillation cooling outer cavity 4 and the height H3 of the oscillation cooling inner cavity 5 are not too small, and the design is higher as much as possible under the condition of structure permission. The oil fullness of the oscillating cooling cavity is not too high, and the oil fullness needs to be controlled between 40% and 60%. Therefore, the height H2 of the oil return hole 8 protruding from the bottom surface of the oscillating cooling cavity 5 is required to be satisfied, wherein 1/4H1 is not less than H2 and not more than 2/5H1, and preferably, H2=1/3H1, so as to ensure the minimum oil storage capacity of the oscillating cooling cavity under the condition of low load of the diesel engine.
The height of the lower communicating holes 7 is lower than that of the oil return holes 8, the number of the lower communicating holes 7 is about six, the sum of the areas of the through-flow sections of all the lower communicating holes 7 is phi 2, each oil inlet hole is respectively communicated with an oil inlet channel 11, the lower end of the oil inlet channel 11 is communicated with an oil inlet groove 12 of the piston pin seat, the sum of the areas of the through-flow sections of all the oil inlet channels 11 is phi 1, the phi 2 is more than or equal to 1.5 phi 1, and the engine oil is ensured to fully flow between the oscillation cooling outer cavity 4 and the oscillation cooling inner cavity 5,
the area of the through-flow section of the oil return hole 8 is phi 3,3.5 phi 1 is not less than phi 3 and not more than 5 phi 1, and further the engine oil fullness of the oscillating cooling cavity is controlled between 40 percent and 60 percent.
Piston pin boss oil groove 12 is located on the piston pin boss of piston skirt 2, and piston pin boss oil groove 12 sets up around piston pin 3, and piston pin 3 is equipped with four piston pin oil feed ways 13, and piston pin boss oil groove 12 is linked together with three piston pin oil feed way 13 simultaneously, and the main pressure-bearing angle theta department of piston pin boss does not set up the oil groove, ensures that the surface pressure is less, is favorable to the oil film to be continuous simultaneously, gains good pressure-bearing effect, and theta is greater than or equal to 60.
The foregoing is illustrative of the best mode of the invention, and details not described herein are within the common general knowledge of a person of ordinary skill in the art. The protection scope of the present invention is subject to the content of the claims, and any equivalent transformation based on the technical teaching of the present invention is also within the protection scope of the present invention.
Claims (10)
1. A high efficiency, oscillation cooled piston comprising: the piston comprises a piston top, a piston skirt and a piston pin, wherein the piston top and the piston skirt are fixedly connected to form an oscillation cooling outer cavity and an oscillation cooling inner cavity, and the piston is characterized in that:
an upper communicating hole and a lower communicating hole are communicated between the oscillation cooling outer cavity and the oscillation cooling inner cavity, the upper communicating holes and the lower communicating holes are respectively distributed in the circumferential direction, the upper communicating hole is positioned above the lower communicating hole, the oscillation cooling outer cavity is provided with a plurality of oil inlet holes distributed in the circumferential direction, and an oil return hole is arranged in the oscillation cooling inner cavity;
and cooling grooves are distributed on the top surfaces of the oscillation cooling outer cavity and the oscillation cooling inner cavity.
2. A highly efficient oscillating cooling piston according to claim 1, wherein said upper communication hole is an inclined hole having a high outer portion and a low inner portion.
3. A high efficiency vibration cooled piston as set forth in claim 1 wherein said top wall of said piston crown has a thickness of between 10mm and 15mm.
4. A high efficiency vibration cooled piston as set forth in claim 1 wherein said cooling grooves are circular arc grooves, said cooling grooves have a radius R, R is 3mm or less and R is 5mm or less, said cooling grooves have a depth D, D is 2mm or less and D is 3mm or less.
5. A high efficiency oscillatingly cooled piston as set forth in claim 1, wherein said oil gallery protrudes from a floor of said oscillatingly cooled interior cavity.
6. A high efficiency oscillatory cooling piston according to claim 5, wherein the height of the oscillatory cooling cavity is H1, the height of the oil return hole projection is H2, and 1/4H1 is not less than H2 and not more than 2/5H1.
7. A high efficiency oscillatingly cooled piston as set forth in claim 5, wherein said lower communication hole is lower in height than said oil return hole.
8. The efficient oscillating cooling piston as recited in claim 1, wherein each oil inlet hole is respectively communicated with an oil inlet channel, the lower end of each oil inlet channel is communicated with the piston pin seat oil inlet groove, the sum of the through-flow cross sections of all the oil inlet channels is phi 1, the sum of the through-flow cross sections of all the lower communicating holes is phi 2, and phi 2 is more than or equal to 1.5 phi 1.
9. An efficient oscillating cooling piston according to claim 1, characterized in that the area of the through-flow cross-section of the oil return hole is phi 3,3.5 phi 1 ≤ phi 3 ≤ 5 phi 1.
10. An efficient oscillating cooling piston as defined in claim 8, wherein said pin boss oil grooves are formed in said pin bosses of said piston skirt, said pin boss oil grooves are disposed around said piston pin, said piston pin is provided with four piston pin oil passages, said pin boss oil grooves are simultaneously communicated with three said piston pin oil passages, and a main pressure-receiving angle θ of said pin bosses, θ, is greater than or equal to 60 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221814702.XU CN217873036U (en) | 2022-07-13 | 2022-07-13 | High-efficiency oscillation cooling piston |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221814702.XU CN217873036U (en) | 2022-07-13 | 2022-07-13 | High-efficiency oscillation cooling piston |
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| Publication Number | Publication Date |
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| CN217873036U true CN217873036U (en) | 2022-11-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221814702.XU Active CN217873036U (en) | 2022-07-13 | 2022-07-13 | High-efficiency oscillation cooling piston |
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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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2022
- 2022-07-13 CN CN202221814702.XU patent/CN217873036U/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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