A piston top structure and a piston

Abstract

The present invention discloses a piston top structure, which relates to the field of pistons. The piston top structure includes a machining area and a non-machining area. A process hole is provided on the machining area, and a process column is filled in the process hole. Wherein, the maximum distance from the center point of the process hole to the edge of the process hole is equal to the distance from the center point of the process hole to the inner edge of the non-machining area. The present invention also discloses a piston. During the process of machining the process column with a turning tool, the turning tool will not affect the non-machined part of the piston top structure.

Description

Technical Field

[0001] The present invention relates to the field of pistons, and more particularly to a piston top structure and a piston. Background Art

[0002] A piston is an important component of an engine. It is located in a piston cylinder. A combustion chamber is formed between the top of the piston and the cylinder head of the piston cylinder. The explosive force generated by the rapid expansion during fuel combustion is used to push the piston to move. The linear reciprocating motion of the piston is converted into the rotational motion of the output shaft through a connecting rod crank to achieve the conversion between internal energy and mechanical energy. For an engine, the air flow condition in the piston cylinder affects the formation and combustion process of the mixture gas, which is directly related to the power performance, economy and emission characteristics of the engine. Well-organized air movement in the piston cylinder can, for a gasoline engine, increase the flame propagation rate of the gasoline engine and reduce the combustion cycle variation; for a diesel engine, it can promote the mixing of air and unburned fuel during the combustion process and increase the combustion rate.

[0003] When manufacturing a piston, a process hole is made on the top of the piston. The process hole needs to be plugged with a process column, and then the process column is processed with a turning tool. The larger the process hole on the top of the piston is made, the better the forming quality of the piston. However, if the turning tool wears the non-processing part during processing, it will affect the compression ratio. Nowadays, in order to prevent the turning tool from affecting the non-processing part, the process hole is made relatively small, so the forming quality of the piston is relatively poor. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, one of the purposes of the present invention is to provide a piston top structure in which the turning tool will not affect the non-processing part of the piston top structure during the process of processing the process column.

[0005] The present invention is implemented by adopting the following technical solutions:

[0006] A piston top structure, the piston top structure includes a processing area and a non-processing area. A process hole is provided on the processing area, and a process column is filled in the process hole; wherein, the maximum distance from the center point of the process hole to the edge of the process hole is equal to the distance from the center point of the process hole to the inner edge of the non-processing area.

[0007] Preferably, the process hole is arranged in a rounded rectangle shape.

[0008] Preferably, the piston top structure includes a middle plane area, a first convex area and a second convex area. The first convex area and the second convex area are located on both sides of the middle plane area, and both the first convex area and the second convex area are connected to the middle plane area.

[0009] Preferably, the first convex area and the second convex area are higher than the middle plane area.

[0010] Preferably, first valve-avoiding pits are provided on both sides of the intersection of the first convex area and the middle flat area, and second valve-avoiding pits are provided on both sides of the intersection of the second convex area and the middle flat area.

[0011] Preferably, both sides of the middle flat area extend to the edge of the piston top structure, and the center point of the process hole coincides with the center point of the middle flat area.

[0012] Preferably, the two side edges where the middle flat area is respectively connected to the first convex area and the second convex area are arranged in a line segment shape.

[0013] Preferably, the first convex area includes a first flat area and a first transition area. One side of the first transition area is connected to the first flat area, and the other side is connected to the middle flat area. The surface at the intersection of the first transition area and the first flat area is an arc surface.

[0014] Preferably, the second convex area includes a second flat area and a second transition area. One side of the second transition area is connected to the second flat area, and the other side is connected to the middle flat area. The surface at the intersection of the second transition area and the second flat area is an arc surface.

[0015] Another object of the present invention is to provide a piston.

[0016] A piston includes a head, a skirt, and the piston top structure as described above. The head is arranged below the piston top structure, the skirt is arranged below the head, and the piston top structure, the head, and the skirt are connected in sequence.

[0017] Compared with the prior art, the beneficial effect of the present invention is that: during the manufacturing process of the piston, to ensure the compression ratio, after the compression ratio is determined, the non-machining area in the piston top structure is also determined. During the process of the turning tool machining the process column, the workpiece rotates for machining with the center point of the process hole as the rotation center. In the piston top structure of the present invention, the maximum distance from the center point of the process hole to the edge of the process hole is designed to be equal to the distance from the center point of the process hole to the inner edge of the non-machining area. The circular trajectory swept by the turning tool is just on the edge of the process hole. In this way, the turning tool can make the process hole have a larger area without affecting the non-machining area, thereby ensuring the forming quality of the piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the division of the machining area and the non-machining area of the piston top structure in the embodiment of the present invention.

[0019] Figure 2 It is a schematic structural diagram of the piston top structure in the embodiment of the present invention.

[0020] Figure 3 This is a side schematic view of the piston top structure in the embodiment of the present invention.

[0021] Figure 4 This is a three-dimensional view of the piston top structure in the embodiment of the present invention.

[0022] Reference numerals: 1, machining area; 2, non-machining area; 3, process hole; 4, process column; 5, intermediate plane area; 6, first convex area; 7, second convex area; 8, first valve avoidance pit; 9, second valve avoidance pit; 10, first plane area; 11, first transition area; 12, second plane area; 13, second transition area. Detailed implementation manners

[0023] The following Figures 1-4 elaborates on the technical solutions provided by the invention in more detail.

[0024] As Figures 1-4 shown, the embodiment of the present invention provides a piston top structure. The piston top structure includes a machining area 1 and a non-machining area 2. The machining area 1 is the area passed by the turning tool during the machining of the process column 4, and the non-machining area 2 is the area not passed by the turning tool during the machining of the process column 4. During the process of the turning tool machining the process column 4, the workpiece rotates and is machined with the center point of the process hole 3 as the rotation center. Therefore, the area passed by the turning tool is circular. As Figure 1 shown, the machining area 1 is the area within the circular dotted line, and the non-machining area 2 is the area outside the circular dotted line. A process hole 3 is provided on the machining area 1, and a process column 4 is filled in the process hole 3. The process column 4 needs to be machined by a turning tool to machine the piston surface of the piston. Among them, the maximum distance from the center point of the process hole 3 to the edge of the process hole 3 is equal to the distance from the center point of the process hole 3 to the inner edge of the non-machining area 2. During the process of the turning tool machining the process column 4, the circular trajectory swept by the turning tool just lies on the edge of the process hole 3. In this way, the area of the process hole 3 can be maximized without affecting the non-machining area 2, thereby ensuring the forming quality of the piston.

[0025] The process hole 3 is arranged in a rounded rectangular shape. During the process of the turning tool machining the process column 4, the circular trajectory swept by the turning tool just lies on the rounded edge of the process hole 3. The process hole 3 being arranged in a rounded rectangular shape is a preferred embodiment, and other shapes, such as rectangular, oval, etc., can also be fully used in the piston top structure of the present invention.

[0026] The piston top structure includes an intermediate flat area 5, a first raised area 6, and a second raised area 7. The first raised area 6 and the second raised area 7 are located on both sides of the intermediate flat area 5, and both the first raised area 6 and the second raised area 7 are connected to the intermediate flat area 5. The first raised area 6 and the second raised area 7 are higher than the intermediate flat area 5. The two sides of the intermediate flat area 5 extend to the edge of the piston top structure, and the center point of the process hole 3 coincides with the center point of the intermediate flat area 5. The two side edges where the intermediate flat area 5 is respectively connected to the first raised area 6 and the second raised area 7 are arranged in a line segment shape. With the above structure, the airflow movement form can be optimized to form a large tumble. During the combustion process in the combustion chamber, when the piston compresses, the tumble can be broken and converted into strong turbulent kinetic energy, thereby accelerating combustion and effectively improving the problem of detonation tendency.

[0027] On both sides of the intersection of the first raised area 6 and the intermediate flat area 5, there are first valve clearance pits 8 provided, and on both sides of the intersection of the second raised area 7 and the intermediate flat area 5, there are second valve clearance pits 9 provided. The first valve clearance pits 8 and the second valve clearance pits 9 are areas that ensure the safe distance between the piston and the valve. The overall structure of this area is an arc structure. The first valve clearance pits 8 are respectively connected to the first raised area 6 and the intermediate flat area 5, and the second valve clearance area is respectively connected to the second raised area 7 and the intermediate flat area 5.

[0028] The first raised area 6 includes a first flat area 10 and a first transition area 11. One side of the first transition area 11 is connected to the first flat area 10, and the other side is connected to the intermediate flat area 5. The surface at the intersection of the first transition area 11 and the first flat area 10 is an arc surface. The height of the first flat area 10 is higher than that of the intermediate flat area 5. By setting the first transition area 11, the transition from the first flat area 10 to the intermediate flat area 5 can be made smooth. During the process of machining the process column 4 with a turning tool, the circular trajectory swept by the turning tool will pass through the first transition area 11, but the turning tool will not machine the first flat area 10, thereby ensuring that the turning tool does not affect the non-machined area 2 and guaranteeing the forming quality of the piston.

[0029] The second raised area 7 includes a second flat area 12 and a second transition area 13. One side of the second transition area 13 is connected to the second flat area 12, and the other side is connected to the intermediate flat area 5. The surface at the intersection of the second transition area 13 and the second flat area 12 is an arc surface. The height of the second flat area 12 is higher than that of the intermediate flat area 5. By setting the second transition area 13, the transition from the second flat area 12 to the intermediate flat area 5 can be made smooth. During the process of machining the process column 4 with a turning tool, the circular trajectory swept by the turning tool will pass through the second transition area 13, but the turning tool will not machine the second flat area 12, thereby ensuring that the turning tool does not affect the non-machined area 2 and guaranteeing the forming quality of the piston.

[0030] A piston, comprising a head, a skirt and the piston top structure as described above, the head is arranged below the piston top structure, the skirt is arranged below the head, and the piston top structure, the head and the skirt are connected in sequence. The piston adopts the piston top structure in this embodiment, so that the turning tool can make the process hole 3 have a larger area without affecting the non-machining area 2, ensuring the compression ratio and the forming quality of the piston at the same time.

[0031] The above-mentioned implementation manners are only the preferred implementation manners of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by those skilled in the art on the basis of the present invention belong to the protection scope required by the present invention.

Claims

1. A piston top structure, characterized in that: The piston top structure includes a machining area and a non-machining area. A process hole is provided on the machining area, and a process post is filled in the process hole. Wherein, the maximum distance from the center point of the process hole to the edge of the process hole is equal to the distance from the center point of the process hole to the inner edge of the non-machining area; The process hole is arranged in a rounded rectangle shape; The piston top structure includes an intermediate plane area, a first convex area and a second convex area. The first convex area and the second convex area are located on both sides of the intermediate plane area, and both the first convex area and the second convex area are connected to the intermediate plane area; The first convex area and the second convex area are higher than the intermediate plane area; Both sides of the intermediate plane area extend to the edge of the piston top structure, and the center point of the process hole coincides with the center point of the intermediate plane area.

2. The piston top structure according to claim 1, characterized in that: On both sides of the intersection of the first convex area and the intermediate plane area, first valve-avoiding pits are provided, and on both sides of the intersection of the second convex area and the intermediate plane area, second valve-avoiding pits are provided.

3. The piston top structure according to claim 1, characterized in that: The two side edges where the intermediate plane area is respectively connected to the first convex area and the second convex area are arranged in a line segment shape.

4. The piston top structure according to claim 1, wherein: The first convex area includes a first plane area and a first transition area. One side of the first transition area is connected to the first plane area, and the other side is connected to the intermediate plane area. The surface at the intersection of the first transition area and the first plane area is an arc surface.

5. The piston top structure according to claim 1, characterized in that: The second convex area includes a second plane area and a second transition area. One side of the second transition area is connected to the second plane area, and the other side is connected to the intermediate plane area. The surface at the intersection of the second transition area and the second plane area is an arc surface.

6. A piston, characterized in that: It includes a head, a skirt and the piston top structure according to any one of claims 1-5. The head is arranged below the piston top structure, the skirt is arranged below the head, and the piston top structure, the head and the skirt are connected in sequence.

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