Piston of internal combustion engine, internal combustion engine and vehicle

Abstract

The utility model discloses a piston of an internal combustion engine, the internal combustion engine and a vehicle, and relates to the technical field of internal combustion engines, the piston of the internal combustion engine comprises a first piston main body, a second piston main body and a heat exchange medium, the first piston main body is provided with a top wall and a side wall, and the side wall is annular and surrounds the edge of the top wall; a containing groove with the open lower end is formed in the side wall, the cross section of the containing groove is arc-shaped and extends in the circumferential direction of the side wall, the second piston body is annular and located below the side wall, the second piston body is fixedly connected with the side wall and seals the open end of the containing groove, and the heat exchange medium is arranged in the containing groove. Therefore, when the piston moves, the heat exchange medium oscillates in the containing cavity, the temperature of the top wall of the first piston body can be transmitted to the side wall of the first piston body and the second piston body, then the temperature of the top wall of the piston is rapidly reduced, local hot spots are prevented from appearing on the top wall of the piston, and the risks of piston perforation damage and preignition are reduced.

Description

Technical Field

[0001] The utility model relates to the field of internal combustion engines, in particular to a piston of an internal combustion engine, an internal combustion engine and a vehicle. Background Art

[0002] In the related art, methanol fuel is a new energy fuel with good anti-knock performance, but methanol is an oxygen-containing fuel. Compared with gasoline engines, it has a faster combustion speed and a higher combustion temperature, which will cause the piston top temperature to be too high, the material strength to decrease, and the piston to be perforated and damaged. At the same time, the excessively high piston top temperature is prone to form local hot spots, which are easy to form hot spots on the piston surface, causing engine pre-ignition, causing problems such as piston burn-through. Therefore, it is necessary to strengthen the heat dissipation of the piston top of the methanol engine, reduce the piston top temperature, and avoid pre-ignition. The existing piston cooling method is oil cooling. Although it has a certain cooling effect on the piston, the oil consumption is large, resulting in high cooling costs. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a piston of an internal combustion engine, which can quickly reduce the temperature of the piston, thereby reducing the risk of piston perforation damage and also reducing the cooling cost of the piston.

[0004] The utility model further provides an internal combustion engine with the piston.

[0005] The utility model further provides a vehicle with an internal combustion engine.

[0006] According to the embodiment of the utility model, the piston of the internal combustion engine includes: a first piston body, the first piston body has a top wall and a side wall, the side wall is annular and is arranged around the edge of the top wall, the side wall is formed with a receiving groove with an open lower end, the cross-section of the receiving groove is arc-shaped and extends circumferentially along the side wall; a second piston body, the second piston body is annular and is located below the side wall, the second piston body is fixedly connected to the side wall and seals the open end of the receiving groove; a heat exchange medium, the heat exchange medium is arranged in the receiving groove.

[0007] According to the piston of the internal combustion engine of the embodiment of the utility model, by arranging the heat exchange medium in the receiving groove, when the piston moves, the heat exchange medium oscillates in the receiving cavity, and can transfer the temperature of the top wall of the first piston body to the side wall of the first piston body and the second piston body, thereby quickly reducing the temperature of the top wall of the piston, avoiding the occurrence of local hot spots on the top wall of the piston, and reducing the risk of piston perforation damage and pre-ignition.

[0008] According to some embodiments of the present invention, there are multiple accommodating grooves, and the multiple accommodating grooves are arranged in sequence along the circumference of the side wall.

[0009] According to some embodiments of the present invention, the plurality of accommodating grooves are evenly spaced apart along the circumference of the side wall.

[0010] According to some embodiments of the present invention, in a direction from the first piston body to the second piston body, the accommodating groove is inclined toward the outer side of the side wall.

[0011] According to some embodiments of the present invention, the volume of the containing tank is V1, and the volume of the heat exchange medium arranged in each containing tank is V2, satisfying the relationship: 0.4V1≤V2≤0.7V1.

[0012] According to some embodiments of the present invention, the heat exchange medium is metallic sodium.

[0013] According to some embodiments of the present invention, the receiving groove and the top wall are spaced apart.

[0014] According to some embodiments of the utility model, a first pin hole is formed at the end of the side wall facing the second piston body, the first pin hole and the accommodating groove are spaced circumferentially along the side wall, a second pin hole is formed at the end of the second piston body facing the first piston body, and the first pin hole and the second pin hole are opposite to form a pin hole.

[0015] An internal combustion engine according to an embodiment of the utility model comprises the piston of the internal combustion engine of the above embodiment.

[0016] A vehicle according to an embodiment of the utility model includes the internal combustion engine of the above embodiment.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 It is a structural schematic diagram of the piston of the utility model embodiment;

[0020] Figure 2 It is a cross-sectional view of the piston of the utility model embodiment.

[0021] Reference numerals:

[0022] Piston 100;

[0023] The first piston body 10; the top wall 11; the side wall 12; the receiving groove 13; the heat exchange medium 14; the first pin hole 15;

[0024] The second piston body 20; the second pin opening 21;

[0025] Pin hole 30;

[0026] Piston skirt 40. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] Reference below Figure 1-Figure 2 A piston 100 of an internal combustion engine, an internal combustion engine, and a vehicle according to embodiments of the present invention are described.

[0029] According to the embodiment of the utility model, the piston 100 of the internal combustion engine includes: a first piston body 10, the first piston body 10 has a top wall 11 and a side wall 12, the side wall 12 is annular and is arranged around the edge of the top wall 11, and the side wall 12 is formed with a receiving groove 13 with an open lower end, and the cross-section of the receiving groove 13 is arc-shaped and extends circumferentially along the side wall 12; a second piston body 20, the second piston body 20 is annular and is located below the side wall 12, the second piston body 20 is fixedly connected to the side wall 12 and seals the open end of the receiving groove 13; a heat exchange medium 14, and the heat exchange medium 14 is arranged in the receiving groove 13.

[0030] Among them, the piston 100 includes: a first piston body 10 and a second piston body 20. The piston 100 has a pin hole 30. The first piston body 10 and the second piston body 20 can be cast separately with the diameter of the pin hole 30 of the piston 100 as the boundary, which can simplify the manufacturing process of the piston 100 and help improve the manufacturing accuracy and consistency of the piston 100. In addition, the first piston body 10 and the second piston body 20 can be selected according to actual needs. The material combination with lower cost and better performance can be produced in parallel, thereby reducing the manufacturing cost and cycle of the piston 100.

[0031] The first piston body 10 has a top wall 11 and a side wall 12, the side wall 12 is annular and is arranged around the edge of the top wall 11, the second piston body 20 is annular and is located below the side wall 12, the first piston body 10 and the second piston body 20 are connected to form a cylindrical or roughly cylindrical piston 100, the cylindrical piston 100 has a simple structure and size, is easy to process and produce, and can improve the production efficiency and product quality of the piston 100.

[0032] The second piston body 20 is fixedly connected to the side wall 12, for example, the second piston body 20 and the side wall 12 can be fixedly connected by welding, or the second piston body 20 and the side wall 12 can be fixedly connected by a pin, but the present invention is not limited thereto, and the second piston body 20 and the side wall 12 can also be fixedly connected by other means, as long as the second piston body 20 and the side wall 12 are fixedly connected. This application takes the second piston body 20 and the side wall 12 as an example of being fixedly connected by welding.

[0033] The piston 100 is divided into a first piston body 10 and a second piston body 20, and the first piston body 10 and the second piston body 20 are connected by welding, so that the piston 100 has significant advantages in terms of structural strength, thermal performance, weight cost, manufacturing flexibility and precision. Specifically, the welding process can increase the structural rigidity and bearing strength of the piston 100, so that the piston 100 can withstand higher mechanical loads and thermal loads, and can also accurately control the thermal expansion coefficient of each part of the piston 100, reduce deformation and friction caused by inconsistent thermal expansion, and extend the service life of the piston 100. Compared with the one-piece piston 100, the split piston 100 can adopt a combination of multiple materials, and select materials with lower cost and better performance according to actual needs, thereby reducing the overall manufacturing cost. The split piston 100 welding structure is easy to realize in manufacturing and molding, and the first piston body 10 and the second piston body 20 can be produced in parallel, and then welded and assembled to help reduce the manufacturing difficulty of the piston 100 and improve production efficiency. The welding process can accurately control the size and shape accuracy of the piston 100, ensuring a close fit and good sealing between the piston 100 and components such as the cylinder.

[0034] The side wall 12 of the first piston body 10 is formed with a receiving groove 13 with an open lower end. Figure 2As shown, the cross section of the receiving groove 13 is arc-shaped and extends circumferentially along the side wall 12. The cross section of the receiving groove 13 can be concentric with the center of the cross section of the piston 100 to form an arc shape, and the central angle corresponding to each arc-shaped receiving groove 13 can be set between 70°-110°. The regular shape is convenient for processing, and the space inside the piston 100 can be fully utilized to increase the volume of the receiving groove 13 so that more heat exchange medium 14 can be set in the receiving groove 13. The second piston body 20 is fixedly connected to the side wall 12 of the first piston body 10 to seal the open end of the receiving groove 13, and the heat exchange medium 14 can be sealed in the piston 100. The heat exchange medium 14 can be metallic sodium. The solid metallic sodium is sealed to the receiving groove 13. The melting point of metallic sodium is low, and the specific heat capacity of metallic sodium is large. The conductive performance is good, and a large amount of heat can be effectively absorbed and transferred. By arranging solid sodium metal in the containing groove 13, when the piston 100 moves, the high temperature of the piston 100 can melt the sodium metal into liquid, and the liquid sodium metal can oscillate up and down with the movement of the piston 100, so that the sodium metal can quickly absorb the heat of the top wall 11 of the piston 100 and transfer it to the side wall 12 of the first piston body 10 and the second piston body 20, and can also dissipate heat through the piston rod, cylinder or other cooling systems, which can quickly reduce the temperature of the top wall 11 of the piston 100, improve the heat dissipation efficiency of the piston 100, prevent the piston 100 from overheating, and thus reduce the risk of perforation damage and premature ignition of the piston 100, and no large amount of engine oil is needed to cool the piston 100, which also reduces the cooling cost of the piston 100.

[0035] In addition, by providing the receiving groove 13 at a reasonable position in the piston 100, the weight of the piston 100 can be reduced while ensuring the strength of the piston 100, thereby reducing the inertia and friction loss of the internal combustion engine, increasing the rotation speed and response speed of the internal combustion engine, and thus improving the overall performance of the internal combustion engine.

[0036] According to the piston 100 of the internal combustion engine of the embodiment of the utility model, by arranging the heat exchange medium 14 in the receiving groove 13, when the piston 100 moves, the liquid heat exchange medium 14 oscillates in the receiving cavity, and can transfer the temperature of the top wall 11 of the first piston body 10 to the side wall 12 of the first piston body 10 and the second piston body 20, thereby quickly reducing the temperature of the top wall 11 of the piston 100, avoiding the occurrence of local hot spots on the top wall 11 of the piston 100, thereby reducing the risk of perforation damage and premature ignition of the piston 100, eliminating the need to use a large amount of engine oil for cooling the piston 100, and reducing the cooling cost of the piston 100.

[0037] According to some embodiments of the present invention, Figure 1 and Figure 2 As shown, there may be a plurality of accommodating grooves 13 , and the plurality of accommodating grooves 13 are sequentially arranged along the circumference of the side wall 12 .

[0038] The piston 100 may have two, three, four, or other number of receiving grooves 13, but the present invention is not limited thereto. The piston 100 may also have other number of receiving grooves 13, as long as the number of receiving grooves 13 is more than one. The present application takes two receiving grooves 13 as an example for explanation, and the two receiving grooves 13 are arranged in sequence along the circumference of the side wall 12, such as Figure 2 As shown, the cross-sections of the two receiving grooves 13 can be arc-shaped and arranged in sequence along the circumference of the side wall 12. The cross-section of the receiving groove 13 can be concentric with the center of the cross-section of the piston 100 to form an arc shape, and the central angle corresponding to each arc-shaped receiving groove 13 can be set between 70°-110°. The two receiving grooves 13 are symmetrically distributed along the pin hole 30, so that the shape of the receiving grooves 13 is regular and evenly distributed, which is not only convenient for processing, but also can make full use of the space inside the piston 100, increase the volume of the receiving groove 13 to store more heat exchange medium 14, and can increase the heat exchange medium 14 and the surrounding environment. The contact area with the environment is conducive to the heat exchange medium 14 to uniformly and quickly absorb and dissipate the heat of the piston 100 during the movement of the piston 100, thereby reducing the thermal stress caused by local overheating of the piston 100, improving the durability of the piston 100, and helping to extend the service life of the piston 100. In addition, the two accommodating grooves 13 are arranged in sequence along the circumferential direction of the side wall 12 in a uniform and reasonable layout, which can reduce the risk of weight imbalance of the piston 100 caused by uneven distribution of the heat exchange medium 14, and can also reduce the vibration and noise generated when the piston 100 moves, which is conducive to improving the stability of the operation of the piston 100 and the overall performance of the internal combustion engine.

[0039] According to some embodiments of the present invention, Figure 2 As shown, a plurality of receiving grooves 13 can be evenly spaced along the circumference of the side wall 12 to avoid the pin hole 30 of the piston 100, thereby ensuring the integrity and functionality of the piston 100. It is also possible to maximize the use of the space inside the piston 100 without affecting the pin hole 30 and other key components of the piston 100, thereby increasing the number or volume of the receiving grooves 13, thereby increasing the volume of the heat exchange medium 14, and further improving the heat dissipation efficiency of the piston 100, thereby reducing the risk of perforation damage and premature ignition of the piston 100, and helping to extend the service life of the piston 100.

[0040] According to some embodiments of the present invention, Figure 1As shown, from the first piston body 10 to the second piston body 20, the receiving groove 13 is inclined toward the outer side of the side wall 12. Such an arrangement can increase the length of the receiving groove 13 in the direction from the first piston body 10 to the second piston body 20, thereby increasing the volume of the receiving groove 13, so as to increase the volume of the heat exchange medium 14 and the heat exchange area between the heat exchange medium 14 and the piston 100, which is conducive to faster dissipation of the heat generated by the piston 100 during operation, and helps to guide the heat of the piston 100 to flow along the receiving groove 13 toward the outside of the piston 100, reduce the accumulation of heat inside the piston 100, and further improve the heat dissipation efficiency of the piston 100. In addition, during the operation of the piston 100, the inclined receiving groove 13 also helps to disperse and alleviate stress concentration, thereby improving the structural strength and durability of the piston 100.

[0041] According to some embodiments of the utility model, the heat exchange medium 14 can be metallic sodium, which has good specific heat capacity and thermal conductivity, and can effectively absorb and store a large amount of heat. During the operation of the piston 100, the metallic sodium as the heat exchange medium 14 can quickly absorb and transfer the absorbed heat to the piston skirt 40 and the cooling system, avoiding heat accumulation on the top wall 11 of the piston 100 and the first piston body 10, achieving rapid heat dissipation, thereby reducing the temperature of the top wall 11 of the piston 100, protecting the piston 100 from high temperature damage, helping to maintain the piston 100 within a lower operating temperature range, and improving the working efficiency and reliability of the internal combustion engine.

[0042] In addition, metallic sodium has good compatibility with a variety of materials, which helps to reduce corrosion and wear problems of the piston 100 caused by material incompatibility. Metallic sodium can also maintain stable physical and chemical properties and will not experience significant performance degradation due to long-term use, which can ensure long-term cooling of the piston 100 by metallic sodium. Metallic sodium can also achieve efficient cooling effects under a smaller heat transfer area, which is beneficial to reduce the cooling cost of the piston 100.

[0043] According to some embodiments of the present invention, the volume of the containing tank 13 may be V1, and the volume of the heat exchange medium 14 disposed in each containing tank 13 may be V2, satisfying the relationship: 0.4V1≤V2≤0.7V1.

[0044] The volume V2 of the heat exchange medium 14 is smaller than the volume V1 of the containing tank 13, and 0.4V1≤V2≤0.7V1, that is, V2 can be 0.4V1, 0.7V1 or any value between 0.4V1-0.7V1, for example, V2 can be 0.4V1, 0.41V1, 0.5V1, 0.52V1, 0.6V1, 0.7V1 and other values, but the utility model is not limited thereto, V2 can also be other values ​​between 0.4V1-0.7V1, as long as V2 is 0.4V1, 0.7V1 or any value between 0.4V1-0.7V1. No specific limitation is made here, and it can be reasonably set according to the actual situation.

[0045] Furthermore, the heat exchange medium 14 provided in each containing tank 13 is solid metallic sodium before sealing, and V2 is the volume of the solid metallic sodium. When the piston 100 works at a high temperature, the high temperature of the piston 100 can melt the solid metallic sodium into a liquid state. When the metallic sodium changes from a solid state to a liquid state, its volume increases, and the liquid metallic sodium absorbs and transfers the heat of the piston 100 by oscillating in the containing tank 13. Therefore, it is necessary to leave a sufficient volume margin for the metallic sodium in the containing tank 13, and the volume V2 of the solid metallic sodium satisfies 0.4V1≤V2≤0 .7V1, which can ensure that the liquid metallic sodium oscillates in the containing tank 13, thereby realizing the cooling of the piston 100 by the metallic sodium, so as to reduce the risk of the piston 100 being damaged due to high temperature. In addition, the metallic sodium will generate thermal stress when heated. If the metallic sodium and the containing tank 13 are of similar volume, the thermal stress may be concentrated in the area where the metallic sodium contacts the inner wall of the containing tank 13. The larger volume of the containing tank 13 can disperse the thermal stress, thereby reducing the risk of material fatigue and damage to the inner wall of the containing tank 13 due to concentrated thermal stress, which is beneficial to improving the service life of the piston 100.

[0046] According to some embodiments of the present invention, Figure 1 As shown, the receiving groove 13 and the top wall 11 may be spaced apart.

[0047] Among them, the metallic sodium directly contacts the top wall 11 of the piston 100, which will cause the top wall 11 of the piston 100 to be locally overheated. The spaced arrangement of the receiving groove 13 and the top wall 11 can disperse the heat of the top wall 11 of the piston 100 in a larger area, thereby reducing the risk of local overheating of the top wall 11 of the piston 100. In addition, the metallic sodium will generate thermal stress when heated. If the metallic sodium directly contacts the top wall 11 of the piston 100, it will cause stress concentration and material fatigue on the top wall 11 of the piston 100. Separating the receiving groove 13 from the top wall 11 helps to disperse the stress and reduce the risk of damage to the top wall 11 of the piston 100 due to stress concentration. In addition, during the working process, the piston 100 may be subjected to the impact force from the cylinder. Separating the receiving groove 13 from the top wall 11 can provide more support and buffering for the top wall 11 of the piston 100, thereby improving the impact resistance of the piston 100, and further facilitating the stability and service life of the piston 100. Furthermore, if the metallic sodium in the containing groove 13 leaks, the spacing design can prevent the leaked material from directly contacting the top wall 11 or other key components of the piston 100, thereby reducing the risk of damage and failure of the piston 100. At the same time, it also helps to prevent the leaked material from further spreading to the entire internal combustion engine system, thereby improving the safety and reliability of the entire internal combustion engine.

[0048] According to some embodiments of the present invention, Figure 1 As shown, a first pin opening 15 is formed at the end of the side wall 12 facing the second piston body 20, the first pin opening 15 and the accommodating groove 13 are circumferentially spaced apart along the side wall 12, and a second pin opening 21 is formed at the end of the second piston body 20 facing the first piston body 10, the first pin opening 15 and the second pin opening 21 are opposite to each other to form a pin hole 30.

[0049] The end of the side wall 12 facing the second piston body 20 is formed with a first pin hole 15, and the first pin hole 15 and the receiving groove 13 are spaced apart circumferentially along the side wall 12, so that the receiving groove 13 avoids the first pin hole 15, ensuring the integrity and functionality of the piston 100, and maximizing the use of the space inside the piston 100 without affecting the first pin hole 15 and other key components, increasing the number or volume of the receiving grooves 13, and increasing the volume of the heat exchange medium 14, thereby further improving the heat dissipation efficiency of the piston 100, reducing the risk of perforation damage and premature ignition of the piston 100, and helping to extend the service life of the piston 100. It can also reduce the risk of thermal damage and erosion of the first pin hole 15 by the metallic sodium in the receiving groove 13 during the heat dissipation process, thereby improving the durability of the first pin hole 15, and helping to extend the service life of the piston 100.

[0050] The second piston body 20 is formed with a second pin hole 21 at the end facing the first piston body 10, and the first pin hole 15 and the second pin hole 21 are opposite to each other to form a pin hole 30, which is a perfect circle and is used to assemble the piston rod to ensure that the piston 100 can work stably and reliably. Further, the shape and size of the first pin hole 15 and the second pin hole 21 can be consistent, that is, the first piston body 10 and the second piston body 20 are respectively cast and formed with the diameter of the pin hole 30 of the piston 100 as the boundary. Such a setting is conducive to the precise positioning of the first piston body 10 and the second piston body 20 during casting, thereby improving the processing accuracy of the first piston body 10 and the second piston body 20, ensuring the precise processing of the pin hole 30, reducing the workload of subsequent processing and correction, and thus reducing the production cost of the piston 100.

[0051] The internal combustion engine according to the embodiment of the utility model, including the piston 100 of the internal combustion engine of the above-mentioned embodiment, can quickly reduce the temperature of the top wall 11 of the piston 100, and can reduce the surface temperature of the piston 100 by more than 100 degrees, thereby avoiding the occurrence of local hot spots on the top wall 11 of the piston 100, thereby reducing the risk of perforation damage and premature ignition of the piston 100, and also reducing the cooling cost of the piston 100.

[0052] The vehicle according to the embodiment of the utility model, including the internal combustion engine of the above embodiment, can quickly reduce the temperature of the top wall 11 of the piston 100, and can reduce the surface temperature of the piston 100 by more than 100 degrees, thereby avoiding the occurrence of local hot spots on the top wall 11 of the piston 100, thereby reducing the risk of perforation damage and premature ignition of the piston 100, and also reducing the cooling cost of the piston 100.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0054] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A piston (100) for an internal combustion engine, characterized in that: include: A first piston body (10), the first piston body (10) having a top wall (11) and a side wall (12), the side wall (12) being annular and arranged around the edge of the top wall (11), the side wall (12) being formed with a receiving groove (13) with an open lower end, the receiving groove (13) having an arc-shaped cross section and extending circumferentially along the side wall (12); A second piston body (20), the second piston body (20) is annular and is located below the side wall (12), the second piston body (20) is fixedly connected to the side wall (12) and seals the open end of the receiving groove (13); A heat exchange medium (14), wherein the heat exchange medium (14) is arranged in the containing tank (13).

2. The piston (100) of an internal combustion engine according to claim 1, characterized in that There are a plurality of accommodating grooves (13), and the plurality of accommodating grooves (13) are arranged in sequence along the circumferential direction of the side wall (12).

3. The piston (100) of an internal combustion engine according to claim 2, characterized in that: The plurality of accommodating grooves (13) are evenly spaced apart along the circumference of the side wall (12).

4. The piston (100) of an internal combustion engine according to claim 1, characterized in that In a direction from the first piston body (10) to the second piston body (20), the accommodating groove (13) is arranged to be inclined toward the outer side of the side wall (12).

5. The piston (100) of an internal combustion engine according to claim 1, characterized in that The volume of the containing tank (13) is V1, and the volume of the heat exchange medium (14) arranged in each containing tank (13) is V2, satisfying the relationship: 0.4V1≤V2≤0.7V1.

6. The piston (100) of an internal combustion engine according to claim 1, characterized in that The heat exchange medium (14) is metallic sodium.

7. The piston (100) of an internal combustion engine according to claim 1, characterized in that The containing groove (13) and the top wall (11) are spaced apart.

8. The piston (100) of an internal combustion engine according to any one of claims 1 to 7, characterized in that: A first pin hole (15) is formed at the end of the side wall (12) facing the second piston body (20), and the first pin hole (15) and the accommodating groove (13) are spaced apart circumferentially along the side wall (12). A second pin hole (21) is formed at the end of the second piston body (20) facing the first piston body (10), and the first pin hole (15) and the second pin hole (21) are opposite to each other to form a pin hole (30).

9. An internal combustion engine, characterized in that: A piston (100) for an internal combustion engine comprising the method according to any one of claims 1 to 8.

10. A vehicle, characterized in that: Comprising an internal combustion engine according to claim 9.

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