Piston

Abstract

The utility model provides a piston, and relates to the technical field of pistons. The piston can comprise a body and a coating, and the body is provided with a peripheral face close to a cylinder sleeve. At least one groove is formed in the outer circumferential face of the body. The coating forms a latticed structure, and at least part of the coating is arranged in the groove and protrudes out of the peripheral face of the piston. The coating is of the latticed structure and protrudes out of the peripheral face, airflow is blocked and guided by grids and can form turbulent flow when passing through the area of the latticed structure, and complex and disordered airflow forms resistance relative to stable airflow, so that the blow-by amount is reduced. Besides, in the movement process of the piston, a part of engine oil can be stored in the latticed structure, and the upward movement of the engine oil can be reduced, so that the engine oil consumption is reduced. The coating is at least partially arranged in the groove, so that the binding force between the coating and the body can be increased, and the coating is prevented from falling off from the body in the piston movement process.

Description

Technical Field

[0001] The utility model relates to the technical field of pistons, in particular to a piston. Background Art

[0002] High burst pressure and high power will be one of the main directions for the next generation of engine technology upgrades, and high burst pressure and high power put forward more stringent requirements on engine performance. As one of the core components of the engine, the engine piston ring will face the challenges of higher blowby volume and oil consumption performance requirements. For clean energy fuel engines such as hydrogen, natural gas, and methanol, extremely low blowby volume and extremely low oil consumption requirements put forward higher requirements on the design of piston rings.

[0003] The piston land design is one of the most important factors affecting the amount of blowby and oil consumption. Reasonable optimization of the piston land design has a great impact on the optimization performance. The existing typical piston land design is specifically a smooth design on the land / skirt. The disadvantage of this design is that the control of the amount of blowby is mainly controlled by the gap between the second land and the cylinder liner. If the gap between the second land and the cylinder liner is too small, it is easy to cause wear of the cylinder liner and cylinder failure. If the gap between the second land and the cylinder liner is too large, it is easy to cause blowby problems. The control of oil consumption is mainly controlled by the piston ring, and the few piston land design features have almost no effect on oil consumption.

[0004] In the prior art, there is a coating designed on the outer peripheral surface of the piston, but the coating is only applied to the skirt of the piston, and a layer of coating is completely applied, and then a groove with a preset pattern is designed on the coating to retain lubricant, but the sealing performance of the piston will be greatly reduced. Utility Model Content

[0005] One object of the first aspect of the utility model is to provide a piston to solve the problem in the prior art that the sealing performance and oil storage function of the piston cannot be achieved simultaneously.

[0006] Another purpose of the first aspect of the utility model is to solve the problem of insufficient bonding strength between the existing body and the coating.

[0007] In particular, the utility model provides a piston, comprising:

[0008] A body having an outer peripheral surface close to the cylinder sleeve; the outer peripheral surface of the body is formed with at least one groove; and

[0009] The coating forms a grid-like structure, wherein the coating is at least partially disposed in the groove and protrudes from the outer peripheral surface of the piston.

[0010] Optionally, the coating comprises at least one grid unit, and different grid units have the same or different shapes.

[0011] Optionally, the shape of each of the grid units is selected from a combination of one or more of a triangle, a square, a rectangle, a parallelogram, a trapezoid, a pentagon, a hexagon, a circle, and an ellipse.

[0012] Optionally, the material of the coating includes a lubricating material, and the lubricating material is selected from molybdenum disulfide or carbon.

[0013] Optionally, the thickness of the edge of the grid unit is 5 μm to 200 μm.

[0014] Optionally, the width of the side of the grid unit is 0.5 μm to 5 μm.

[0015] Optionally, the coating (120) is disposed on the outer peripheral surface of the land; or,

[0016] The coating (120) is disposed on the outer peripheral surfaces of the land and the skirt (114).

[0017] Optionally, the shape of the groove is the same as that of the coating layer, and the depth of the groove is less than 10 μm.

[0018] Optionally, there are multiple grooves, and each groove is formed at an intersection of edges of the grid unit.

[0019] Optionally, a depth of each of the grooves is at least one times the thickness of a side of the grid unit.

[0020] The piston of the present invention may include a body and a coating, wherein the coating is a grid-like structure, and the coating is arranged at the outer peripheral surface of the body and protrudes from the outer peripheral surface. The mesh structure formed by the coating is essentially a damping structure formed by utilizing airflow turbulence. When the gas flows through the grid-like structure formed by the coating of the present invention, due to the difference between the air pressure between the middle area of ​​the grid-like structure and the cylinder liner and the air pressure between the edge of the grid-like structure and the cylinder liner, the airflow is blocked and guided by the grid, and turbulence is formed when passing through the grid-like structure area. The complex and disordered airflow forms a resistance relative to the stable airflow, which can reduce the flow of the airflow and thus reduce the amount of blowby. In addition, since the coating of the present invention is arranged on the annular bank, or the outer peripheral surface of the annular bank and the skirt, a portion of the engine oil can be stored in the grid-like structure during the movement of the piston, which can reduce the oil blowby and reduce the oil consumption.

[0021] In this solution, at least one groove is formed on the outer peripheral surface of the body, and the coating is at least partially disposed in the groove, thereby increasing the bonding force between the coating and the body and preventing the coating from falling off from the body during the movement of the piston.

[0022] Based on the detailed description of the specific embodiments of the present invention in combination with the accompanying drawings below, those skilled in the art will become more aware of the above and other purposes, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0024] Figure 1 is a schematic structural diagram of a piston according to a specific embodiment of the utility model;

[0025] Figure 2 is a partial schematic structural diagram of a coating according to a specific embodiment of the utility model;

[0026] Figure 3 is a partial schematic structural diagram of a coating according to another specific embodiment of the utility model;

[0027] Figure 4 is a partial schematic structural diagram of a coating according to another specific embodiment of the utility model;

[0028] Figure 5 is a partial schematic cross-sectional view of the junction between the piston and the coating according to a specific embodiment of the utility model;

[0029] Figure 6 is a partial schematic cross-sectional view of the junction between the piston and the coating according to another specific embodiment of the utility model;

[0030] Figure 7 is a partial schematic cross-sectional view of the junction between the piston and the coating according to another specific embodiment of the utility model;

[0031] Figure 8 is a partial schematic cross-sectional view of the junction between the piston and the coating according to another specific embodiment of the utility model;

[0032] Fig. 9 is a partial schematic cross-sectional view of the junction between the piston and the coating according to another specific embodiment of the utility model;

[0033] Fig.10 It is a partial schematic cross-sectional view of the junction between the piston and the coating according to another specific embodiment of the utility model.

[0034] Description of reference numerals:

[0035] Piston 100; body 110; first land 111; second land 112; third land 113; skirt 114; outer peripheral surface 115; coating 120; grid unit 121; edge 1211; groove 130. DETAILED DESCRIPTION

[0036] In the description of this embodiment, it should be understood that the terms "length", "width", "height", "up", "down", "left", "right", "vertical", "horizontal", "bottom", "inside" and "outside" etc. indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] As a specific embodiment of the present invention, Figure 1 As shown, this embodiment provides a piston 100, which may include a body 110 and a coating 120. The body 110 has an outer peripheral surface 115 close to the cylinder sleeve. The outer peripheral surface 115 of the body 110 is formed with at least one groove 130. The coating 120 forms a grid-like structure, and the coating 120 is at least partially disposed in the groove 130 and protrudes from the outer peripheral surface 115 of the piston.

[0038] Specifically, the outer peripheral surface of the present embodiment includes the outer peripheral surface 115 of the plurality of banks and the skirt 114 of the piston 100. Specifically, the banks may include a first bank 111, a second bank 112, and a third bank 113. At least one bank is provided with a coating 120. Alternatively, at least one bank and the outer peripheral surface 115 of the skirt 114 are provided with a coating 120. For example Figure 1 It is shown that a bank 111 and a skirt 114 are provided with a coating. Preferably, the outer peripheral surface 115 of the bank 111, the second bank 112 and the skirt 114 are all provided with a coating 120. The coating 120 of this embodiment is a grid-like structure, and the coating 120 is arranged at the outer peripheral surface 115 of the body 100 and protrudes from the outer peripheral surface 115. The grid-like structure formed by the coating 120 of this embodiment is essentially a damping structure formed by air flow turbulence. When the gas flows through the grid-like structure formed by the coating 120 in this embodiment, due to the difference between the air pressure between the middle area of ​​the grid-like structure and the cylinder liner and the air pressure between the edge of the grid-like structure and the cylinder liner, the airflow is blocked and guided by the grid, and turbulence will be formed when passing through the grid-like structure area. The complex and disordered airflow forms a resistance relative to the stable airflow, which can reduce the flow of the airflow and thus reduce the amount of blowby.

[0039] In addition, since the coating 120 of this embodiment is arranged on the bank, or the outer peripheral surface 115 of the bank and the skirt 114, the friction between the bank and / or the skirt 114 and the cylinder liner can be reduced, thereby reducing the wear of the bank and the skirt 114. In addition, the coating 120 of this embodiment is a grid-like structure, and its contact area with the cylinder liner is reduced, and the wear power consumption is also reduced accordingly. The coating 120 is a grid-like structure, so that during the movement of the piston 100, a part of the engine oil can be stored in the grid-like structure, which can reduce wear on the one hand, and reduce the oil rushing on the other hand, so as to reduce the engine oil consumption.

[0040] Specifically, in this embodiment, at least one groove 130 is formed on the outer peripheral surface 115 of the main body 110, and the coating 120 is at least partially disposed in the groove 130, thereby increasing the bonding force between the coating 120 and the main body 110 and preventing the coating 120 from falling off from the main body 110 during the movement of the piston 100.

[0041] Specifically, the coating 120 of this embodiment can be prepared by processes such as thermal spraying or laser melting.

[0042] As a specific embodiment of the present invention, the coating 120 of this embodiment may include at least one grid unit 121 , and the structures of different grid units 121 may be the same or different.

[0043] Specifically, the grid unit 121 of this embodiment may be one or more, preferably multiple. Multiple grid units 121 form a grid structure. The shape of each grid unit 121 may be the same or different, and can be designed according to actual conditions.

[0044] As a specific embodiment of the present invention, the shape of each grid unit 121 of this embodiment is selected from a combination of one or more of a triangle, a square, a rectangle, a parallelogram, a trapezoid, a pentagon, a hexagon, a circle, and an ellipse.

[0045] The coating 120 of this embodiment can be a combination of multiple grid units 121 of the same shape or two or more grid units 121 of different shapes. For example, the coating 120 of this embodiment can be composed of multiple rectangular grid units 121 (e.g. Figure 2 ), or composed of a plurality of hexagonal (similar to layered graphene) grid units 121 (as shown in Figure 4 Alternatively, the coating 120 may also be a combination of rectangular grid units 121 and square grid units 121 (eg Figure 3 As another embodiment, it can also be a combination of a triangle and a rectangle, etc. No specific limitation is made here.

[0046] As a specific embodiment of the present invention, the material of the coating 120 of this embodiment may include a lubricating material, and the lubricating material is selected from molybdenum disulfide or carbon.

[0047] Specifically, the coating 120 of the present embodiment is made of a lubricating material, which can help reduce the friction power consumption between the coating 120 and the cylinder liner when the coating 120 and the piston 100 move together.

[0048] Specifically, the thickness a of the edge of the grid unit 121 of this embodiment is 5 μm to 200 μm (eg Figure 6 As shown). For example, the thickness a of the edge 1211 of the grid unit 121 can be 5 μm, 50 μm, 100 μm or 200 μm. Specifically, the thickness should ensure that it can protrude from the outer peripheral surface 115 of the body 110 and contact with the cylinder sleeve. The specific thickness can be designed according to actual conditions.

[0049] Specifically, Figure 3 As shown, the width b of the side 1211 of the grid unit 121 of this embodiment is 0.5 μm to 5 μm. For example, the width b of the side of the grid unit 121 can be 0.5 μm, 1 μm, 3 μm or 5 μm, etc. The specific width can be designed according to actual conditions.

[0050] Specifically, in this embodiment, the shape of the grid unit 121 is a rectangle, and the side 1211 extending along the circumference of the body 110 is the long side, and the side 1211 extending along the axial direction of the body is the short side. The length of the long side is greater than the length of the short side, and the length of the short side is greater than twice the width of the side 1211.

[0051] More specifically, the outermost structure of the coating 120 of this embodiment can be a square (eg Figure 6 as shown) or arc (as Fig.10 As shown), you can also round the corners of the square (as shown Fig. 9 as shown), thereby avoiding breakage and impurities caused by friction.

[0052] As a specific embodiment of the present invention, Figure 6-Figure 10 The outer circumferential surface 115 of the piston 100 of this embodiment is formed with at least one groove 130 , and the coating 120 is at least partially disposed in the groove 130 and protrudes from the outer circumferential surface 115 of the piston 100 .

[0053] As a specific embodiment of the present invention, the shape of the groove 130 of this embodiment is the same as the shape of the coating 120, and the depth of the groove 130 is less than 10 μm.

[0054] Specifically, the groove 130 designed on the outer peripheral surface 115 of the body 110 of this embodiment is consistent with the structure of the coating 120, thereby ensuring that all parts of the coating 120 are prepared on the basis of the groove 130, thereby improving the bonding strength of the coating 120.

[0055] Specifically, the groove 130 of this embodiment can be obtained by laser.

[0056] In addition, the depth c of the groove 130 of this embodiment needs to be less than 10 μm, and it does not need to be too deep. When the thickness of the coating 120 is small, the depth of the groove 130 will be correspondingly smaller to ensure that the coating 120 needs to protrude from the outer peripheral surface 115 of the body 110. For example, when the thickness of the coating 120 is 5 μm, the depth c of the groove 130 can be 0 to 4 μm, excluding 0.

[0057] Specifically, in this embodiment, the shape of the groove 130 can be a square (such as Figure 6 As shown), arc shape (as Figure 7 as shown) or a trapezoidal structure (as Figure 8-Figure 10 shown).

[0058] As another specific embodiment of the present invention, the number of the grooves 130 in this embodiment is multiple, and each groove 130 is formed at the intersection of the grid units 121 .

[0059] Specifically, in this embodiment, a point is made by laser on the outer peripheral surface 115 of the body 110, and the point is located at the intersection of the edges of the grid unit 121. In this way, the coating 120 can be firmly combined with the outer peripheral surface 115 of the body 110 to prevent the coating 120 from falling off from the body 110 during the operation of the piston 100.

[0060] Specifically, the depth of each groove 130 of the present embodiment is at least one time the thickness of the side of the grid unit 121 of the coating 120 .

[0061] Since the coating 120 at the intersection may be coated twice or three times, in order to avoid the formation of convexities or concavities at the grooves 130, the depth of the grooves 130 is designed to be the same as, twice or three times the thickness of the sides of the grid unit 121, so that the outermost sides of the coating 120 can be in the same plane as much as possible.

[0062] Specifically, taking the grid unit 121 as a rectangle as an example, when forming the coating 120, multiple coatings 120 are first coated longitudinally, and then multiple coatings 120 are coated transversely. The number of layers of the coating 120 formed at the intersection is two, and its thickness will be greater than other parts. Therefore, if the depth of the groove 130 is designed to be consistent with the thickness of the coating 120, the thickness of one layer can be offset, so that the thickness of the coating 120 protruding from the outer peripheral surface 115 at the intersection is the thickness of one layer of the coating 120, thereby ensuring that the size of the coating 120 protruding from the outer peripheral surface 115 at the intersection is consistent with the size of other places. In other embodiments, if three or more layers are coated at the intersection, the depth of the groove 130 is at least twice the thickness of the coating 120.

[0063] Specifically, since the groove 130 of this embodiment is designed at the intersection, the shapes of the edges of the grid units 121 of different shapes at the intersection are also different. Preferably, in this embodiment, the shape of the groove 130 is designed to be consistent with the shape of the intersection.

[0064] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived from the contents disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all such other variations or modifications.

Claims

1. A piston, characterized in that: include: A body having an outer peripheral surface close to the cylinder liner; The outer peripheral surface of the body is formed with at least one groove; and The coating forms a grid-like structure, wherein the coating is at least partially disposed in the groove and protrudes from the outer peripheral surface of the piston.

2. The piston according to claim 1, characterized in that The coating comprises at least one grid unit, and different grid units may have the same or different shapes.

3. The piston according to claim 2, characterized in that The shape of each of the grid units is selected from one or more combinations of triangle, square, rectangle, parallelogram, trapezoid, pentagon, hexagon, circle, and ellipse.

4. The piston according to claim 2, characterized in that The material of the coating includes a lubricating material, and the lubricating material is selected from molybdenum disulfide or carbon.

5. The piston according to claim 2, characterized in that The thickness of the edge of the grid unit is 5 μm to 200 μm.

6. The piston according to claim 2, characterized in that The width of the side of the grid unit is 0.5 μm to 5 μm.

7. The piston according to any one of claims 1 to 6, characterized in that The coating is disposed on the outer peripheral surface of the land; or, The coating is disposed on the outer peripheral surfaces of the land and the skirt.

8. The piston according to any one of claims 1 to 6, characterized in that The shape of the groove is the same as that of the coating layer, and the depth of the groove is less than 10 μm.

9. The piston according to any one of claims 2 to 6, characterized in that: There are a plurality of grooves, and each of the grooves is formed at an intersection of edges of the grid unit.

10. The piston according to any one of claims 2 to 6, characterized in that: The depth of each of the grooves is at least one time the thickness of the side of the grid unit.

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