Composite surface treatment piston

Abstract

The utility model relates to the field of pistons, in particular to a composite surface treatment piston. The composite surface treatment piston comprises a head part, wherein the head part is covered with a hard anodic oxidation layer; the main body is covered with a black phosphate coating; and the skirt part is covered with a graphite layer. The composite surface treatment piston is provided with various coatings, so that the performance of each part of the piston can be enhanced as required, and the durability of the piston is improved.

Description

Technical Field

[0001] This utility model relates to the field of pistons, and more specifically to a composite surface-treated piston. Background Technology

[0002] A piston is a reciprocating component in the cylinder block of a car engine. The basic structure of a piston can be divided into the body, head, and skirt. The upper part of the piston is the main component of the combustion chamber, and its shape depends on the type of combustion chamber used.

[0003] Existing piston surface treatment methods are generally limited to one type, making it difficult to meet the performance requirements of different parts.

[0004] Therefore, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0005] To improve or solve the technical problem that existing piston surface treatments are generally of a single type, making it difficult to meet the performance requirements of different parts, this utility model provides a composite surface-treated piston. The composite surface-treated piston includes: a head covered with a hard anodized layer; a body covered with a black phosphating layer; and a skirt covered with a graphite layer.

[0006] This invention relates to a composite surface-treated piston, comprising a head, a body, and a skirt. The head is covered with a hard anodized layer, which offers advantages such as high hardness, good friction reduction and wear resistance, and good heat resistance. This enhances the head's hardness, friction reduction capability, heat resistance, fatigue resistance, and delays crack initiation. The body is covered with a black phosphating layer, which offers advantages such as corrosion resistance, good wear resistance, and self-lubrication. This extends the workpiece's service life, significantly reduces friction and wear, and improves workpiece operating efficiency. The skirt is covered with a graphite layer, which offers corrosion resistance, high-temperature resistance, friction reduction, and lubrication. This improves the cylinder-piston anti-seize properties, prevents premature damage, and avoids cylinder scoring. Through the above configuration, this invention provides a composite surface-treated piston with multiple coatings, which can enhance the performance of each part of the piston as needed, thereby improving the piston's durability.

[0007] Furthermore, a first annular groove is formed in the head; the hard anodized layer extends from the first annular groove to the end of the head away from the body.

[0008] Furthermore, the thickness of the hard anodized layer is 7-20 μm.

[0009] Furthermore, the thickness of the graphite layer is 10-15 μm.

[0010] In summary, compared with the prior art, this utility model has the following beneficial effects:

[0011] The head is covered with a hard anodized layer, which has the advantages of high hardness, good friction reduction and wear resistance, and good heat resistance. It can enhance the head's hardness, friction reduction ability, heat resistance, fatigue resistance, and delay the crack initiation time. The body is covered with a black phosphate layer, which has the advantages of corrosion resistance, good wear resistance, and self-lubrication. It can extend the service life of the workpiece, significantly reduce friction and wear, and improve the workpiece's operating efficiency. The skirt is covered with a graphite layer, which has corrosion resistance, high temperature resistance, friction reduction, and lubrication properties. It can improve the cylinder and piston's anti-seize properties, prevent premature damage, and avoid cylinder scoring. Attached Figure Description

[0012] The preferred embodiments of this utility model are described below with reference to the accompanying drawings, in which:

[0013] Figure 1 This is a schematic diagram of an embodiment of a composite surface-treated piston according to the present invention.

[0014] List of reference numerals in the attached drawings: 1. Head; 11. First annular groove; 12. Second annular groove; 2. Main body; 3. Skirt. Detailed Implementation

[0015] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0016] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," which indicate directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0018] To improve or solve the technical problem that existing piston surface treatments are generally of a single type, making it difficult to meet the performance requirements of different parts, this utility model provides a composite surface-treated piston. The composite surface-treated piston includes: a head 1 covered with a hard anodized layer; a body 2 covered with a black phosphating layer; and a skirt 3 covered with a graphite layer.

[0019] Figure 1 This is a schematic diagram of an embodiment of a composite surface-treated piston according to this utility model. Figure 1 As shown, in one or more embodiments, the composite surface-treated piston of the present invention includes a head 1, a body 2 and a skirt 3, and a variety of coatings are formed on the piston surface.

[0020] See also Figure 1 The head 1 has a first end near the body 2 and a second end opposite to the first end. A first annular groove 11 and a second annular groove 12 are formed near the second end, with the first annular groove 11 near the second end and the second annular groove 12 near the first end. In one or more embodiments, a hard anodized layer is applied to the head 1. Specifically, the hard anodized layer is formed by passing a direct current through an electrolyte such as sulfuric acid or oxalic acid, using a piston as the anode and a lead plate as the cathode, and forming a hard aluminum oxide film on the piston surface through an electrochemical reaction. The hard anodized layer has high hardness, with a microhardness of HV300 or higher; good friction reduction and wear resistance, as the oxide film has micropores that can adsorb various lubricants, providing oil storage capacity, increasing friction reduction capability, and good wear resistance; good heat resistance, as the film has poor thermal conductivity, with a thermal conductivity of 67 W / mK, approximately 1 / 3 that of pure aluminum, and a melting point as high as 2000℃, and can withstand temperatures above 1500℃. In particular, oxidation treatment of the piston head 1 improves its heat resistance and fatigue resistance, and delays crack initiation. Simultaneously, it positively contributes to improving engine thermal efficiency and reducing fuel consumption. Furthermore, the hard anodized layer extends from the first annular groove 11 to the second end and covers the end face of the second end. Furthermore, the thickness of the hard anodized layer is 7-20 μm.

[0021] See also Figure 1In one or more embodiments, a black phosphate layer is applied to the main body 2. Specifically, the black phosphate layer primarily functions to prevent corrosion, improve wear resistance, and provide self-lubrication. After phosphating, a porous phosphate film forms on the piston surface. This film possesses excellent corrosion resistance, lubrication, and wear resistance, significantly improving the piston's corrosion resistance and service life. The black phosphate layer provides corrosion protection: the phosphate film isolates the metal from direct contact with the external environment, preventing oxidation and corrosion, thereby extending the workpiece's service life; it improves wear resistance: the surface hardness of the workpiece increases after phosphating, effectively reducing wear, especially in high-speed rotating components such as pistons and bearings, significantly reducing friction and wear; and it provides self-lubrication: the porous structure of the phosphate film has good oil absorption, forming a lubricating oil film on the workpiece surface, reducing friction and improving the workpiece's operating efficiency. Furthermore, the black phosphate layer extends from the main body 2 to the first annular groove 11 and is in contact with the hard anodized layer.

[0022] See also Figure 1 In one or more embodiments, a graphite layer is applied to the skirt 3. Specifically, a black inorganic lubricant with graphite as the main component is printed on the surface of the skirt 3. This lubricant has good adhesion to the piston surface and possesses corrosion resistance, high temperature resistance, friction reduction, and lubrication properties, greatly improving the anti-seizure properties of the cylinder and piston, preventing premature damage, and avoiding cylinder scoring. Simultaneously, this coating also has good resistance to oil and other fuels, effectively preventing the harmful effects of impurities generated by the mixed oil entering the cylinder and piston contact surface during cold starts. This lubricating coating provides advantages such as low wear, smooth operation, improved fuel economy, and reduced emissions within 100,000 kilometers of machine operation, ensuring sufficient horsepower during long-term operation and significantly improving overall machine performance and lifespan. Furthermore, the graphite layer thickness is 10-15 μm; friction life: 478 minutes (standard is 450 minutes); scratch resistance load 2000 Ib; bonding strength: qualified according to ISO2409 cross-cut test method; working environment temperature: -70-380℃; corrosion resistance: no corrosion after 500 hours under neutral salt spray test (ISO3768) conditions.

[0023] This invention improves the performance of different parts of the piston and enhances its durability by applying appropriate coatings to different parts of the piston.

[0024] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A composite surface treated piston characterized by, Comprise: a head (1) on which a hard anodizing layer is covered; a body (2) on which a black phosphating layer is covered; a skirt (3) on which a graphite layer is covered.

2. A composite surface treated piston as in claim 1 wherein, A first ring groove (11) is formed on the head (1); the hard anodizing layer extends from the first ring groove (11) to one end of the head (1) away from the body (2).

3. A composite surface treated piston as in claim 1 wherein, The thickness of the hard anodizing layer is 7-20um.

4. A composite surface treated piston as in claim 1 wherein, The thickness of the graphite layer is 10-15um.

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