High-strength wear-resistant camshaft

Abstract

The utility model discloses a kind of high-strength wear-resistant camshafts, comprising: camshaft;Camshaft's journal has carburizing layer, wear-resistant coating and phosphate film layer, the outermost side of carburizing layer is equipped with hardening layer, oil groove is equipped on hardening layer, oil groove is formed by cross symmetrical groove one annular array, one end of two groove one respectively extends to the edge at the both sides of journal, the other end of two groove one is respectively extended twice and connected in symmetrical groove one, the both sides wall of journal is equipped with the groove two of U shape annular array. The utility model is provided with wear-resistant layer and oil groove at journal, the hardness of journal surface is improved in carburizing layer in wear-resistant layer, wear-resistant coating is alloy coating and can play the role of protection and wear resistance to journal, phosphate film layer plays the role of improving surface lubrication, reduces initial running-in wear.

Description

Technical Field

[0001] This utility model belongs to the field of camshaft technology, specifically, it relates to a high-strength wear-resistant camshaft. Background Technology

[0002] As a core component of the engine's valve train, the camshaft's performance directly affects the engine's torque output and service life. The relative movement between the camshaft journal and the bearing mating part will cause wear. Severe wear or poor lubrication will affect the smooth operation of the camshaft. In order to improve wear resistance, a high-strength wear-resistant camshaft is provided. Utility Model Content

[0003] In view of this, the technical problem to be solved by this utility model is to provide a high-strength wear-resistant camshaft, thereby solving the problem of poor wear resistance of the journal of the camshaft in the prior art.

[0004] To solve the above-mentioned technical problems, this utility model discloses a high-strength wear-resistant camshaft, comprising: a camshaft; the journal of the camshaft has a carburized layer, a wear-resistant coating and a phosphate film layer, the outermost part of the carburized layer is provided with a hardened layer, the hardened layer is provided with an oil groove, the oil groove is formed by a circular array of cross-symmetrical grooves, one end of the two grooves extends to the edge of both sides of the journal, the other end of the two grooves extends twice and connects to the symmetrical grooves, and the two side walls of the journal are provided with a U-shaped circular array of grooves.

[0005] Furthermore, the thickness of the aforementioned hardened layer is 0.5–2 mm.

[0006] Furthermore, the thickness of the aforementioned phosphate film layer is 5–15 μm.

[0007] Furthermore, the U-shaped opening of the aforementioned groove two is arranged facing outwards.

[0008] Compared with the prior art, this application can achieve the following technical effects:

[0009] This invention features a wear-resistant layer and an oil groove at the journal. The carburized layer in the wear-resistant layer increases the hardness of the journal surface, and the wear-resistant coating is an alloy coating that can protect and wear-resistant the journal. The phosphate film layer improves surface lubrication and reduces initial break-in wear.

[0010] Of course, any product implementing this application does not necessarily need to achieve all of the technical effects described above at the same time. Attached Figure Description

[0011] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0012] Figure 1 This is a schematic diagram of a camshaft according to one embodiment of the present invention;

[0013] Figure 2 This is a cross-sectional schematic diagram of a camshaft according to one embodiment of the present invention;

[0014] Figure 3 This is a schematic diagram of the journal surface according to one embodiment of the present invention;

[0015] Figure 4 This is a schematic diagram of the two side walls of the journal according to one embodiment of the present invention.

[0016] Attached Figure Labels

[0017] Camshaft 1, journal 2, carburized layer 3, wear-resistant coating 4, phosphate film layer 5, oil groove 6, groove one 7, groove two 8. Detailed Implementation

[0018] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0019] Please refer to Figures 1 to 4 , Figure 1 This is a schematic diagram of a camshaft according to one embodiment of the present invention; Figure 2 This is a cross-sectional schematic diagram of a camshaft according to one embodiment of the present invention; Figure 3 This is a schematic diagram of the journal surface according to one embodiment of the present invention; Figure 4 This is a schematic diagram of the two side walls of the journal according to one embodiment of the present invention.

[0020] A high-strength wear-resistant camshaft includes: a camshaft 1; the journal 2 of the camshaft 1 has a carburized layer 3, a wear-resistant coating 4, and a phosphate film layer 5. The outermost part of the carburized layer 3 is provided with a hardened layer, and the hardened layer is provided with an oil groove 6. The oil groove 6 is formed by a circular array of cross-symmetrical grooves 7. One end of each of the two grooves 7 extends to the edge of both sides of the journal 2, and the other end of each of the two grooves 7 extends twice and connects to the symmetrical grooves 7. The two side walls of the journal 2 are provided with a U-shaped circular array of grooves 8.

[0021] Camshaft 1 is made of ductile iron, suitable for medium-load engines. A high-hardness, high-wear-resistant surface layer is formed on the journal 2 working surface of camshaft 1 through surface treatment, while maintaining the toughness of the base material. The process includes:

[0022] Carburizing: Carburizing is a chemical heat treatment process in which the camshaft 1 (usually low carbon steel or low alloy structural steel) is placed in a carbon-rich medium (such as gaseous carburizing agent or solid carburizing agent) and carbon atoms are diffused into the surface layer of the workpiece at high temperature (900-950℃) to form a carburized layer 3 of a certain depth (usually 0.5-2mm). Then, through quenching + low temperature tempering treatment, the surface layer obtains a martensitic structure with high hardness (58-64HRC), while the core still maintains good toughness and strength.

[0023] Wear-resistant coating: A ceramic coating (such as Al2O3-TiO2) or an alloy coating (such as Fe-Cr-C) is deposited on the working surface of journal 2 using thermal spraying (such as plasma spraying or arc spraying) technology. The coating hardness can reach more than 60HRC and can repair worn surfaces and extend service life.

[0024] Phosphating treatment: A phosphate film (5-15 μm) is formed on the surface. Although the hardness is not high (300-600 HV), it can improve lubrication performance and reduce initial break-in wear. It is often used as an auxiliary wear-resistant process.

[0025] The U-shaped opening of groove 28 faces outward. When the engine is running, the oil splashes onto the camshaft 1. The oil seeps into the groove 7 on the surface of the journal 2 along the U-shaped groove 28 on both sides of the journal. The oil spreads along the groove 7 to cover the surface of the journal 2, so that the relative movement between the journal 2 and the bearing reduces wear.

[0026] This invention provides a wear-resistant layer and an oil groove 6 at the journal 2. The carburized layer in the wear-resistant layer increases the hardness of the journal surface. The wear-resistant coating is an alloy coating that can protect and wear-resistant the journal. The phosphate film layer improves surface lubrication and reduces initial break-in wear.

[0027] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A high-strength wear-resistant camshaft comprising: Camshaft; The camshaft journal is characterized by having a carburized layer, a wear-resistant coating, and a phosphate film layer. The outermost part of the carburized layer is provided with a hardened layer, and the hardened layer is provided with an oil groove. The oil groove is formed by a circular array of cross-symmetrical grooves. One end of each of the two grooves extends to the edge of both sides of the journal, and the other end of each groove extends twice to connect with the symmetrical groove. The two side walls of the journal are provided with a U-shaped circular array of grooves.

2. The high-strength, wear-resistant camshaft of claim 1, wherein, The thickness of the hardened layer is 0.5 to 2 mm.

3. The high-strength, wear-resistant camshaft of claim 2, wherein, The thickness of the phosphate film layer is 5–15 μm.

4. The high-strength, wear-resistant camshaft of claim 3, wherein, The U-shaped opening of the second groove faces outward.

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