Sliding bearing for dual-mass flywheel and preparation method of sliding bearing

Abstract

The invention relates to the technical field of engines, in particular to a sliding bearing for a dual-mass flywheel and a preparation method of the sliding bearing. The self-lubricating coating is combined on the surface of the bearing body, and the components of the self-lubricating coating comprise aluminum oxide, titanium dioxide and molybdenum disulfide; the self-lubricating coating comprises the following components in percentage by weight: 75 to 89 percent of aluminum oxide; 10%-20% of titanium dioxide; and 1-5% of molybdenum disulfide. According to the sliding bearing and the preparation method thereof, the impact resistance and wear resistance of the sliding bearing can be effectively improved, the service life mileage of a dual-mass flywheel is prolonged, the comfort of a commercial vehicle is improved, and the NVH performance is improved.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to a sliding bearing for a dual-mass flywheel and a preparation method thereof. Background Art

[0002] In order to effectively reduce the NVH of the whole vehicle and improve the comfort of customers, dual-mass flywheel technology is adopted. This technology has been maturely applied in the field of passenger cars. The dual-mass flywheel technology is to divide the original flywheel into two parts. One part is retained at the original position on the side of the engine, playing the role of the original flywheel, used to start and transmit the rotational torque of the engine. This part is called the first mass (primary mass), and the other part is placed on the side of the transmission of the transmission system to increase the rotational inertia of the transmission. This part is called the second mass (secondary mass). There is an annular oil cavity between the two flywheel parts, and a spring damper is installed in the cavity. The spring damper connects the two flywheel parts into a whole.

[0003] At present, dual-mass flywheels use sliding bearing structures. Figure 1 As shown, during long-mileage operation, the sliding bearing is impacted by axial and radial forces, which will cause increased wear, resulting in increased bearing clearance and abnormal flywheel noise. This is especially true for commercial vehicles, where the dual-mass flywheel is subject to greater impact force due to the larger output torque of the diesel engine than that of passenger vehicles. The sliding bearing, its core component, is more prone to wear problems, limiting its application in commercial vehicles. Summary of the invention

[0004] In view of the problems existing in the background technology, the present application provides a sliding bearing for a dual-mass flywheel and a preparation method thereof, which can effectively improve the impact resistance and wear resistance of the sliding bearing, extend the service life mileage of the dual-mass flywheel, improve the comfort of commercial vehicles, and improve the NVH performance.

[0005] According to one aspect of the present invention, there is provided a sliding bearing for a dual-mass flywheel, comprising: a bearing body; a self-lubricating coating, wherein the self-lubricating coating is bonded to the surface of the bearing body, and the components of the self-lubricating coating include aluminum oxide, titanium dioxide and molybdenum disulfide; in terms of weight percentage, the contents of the components of the self-lubricating coating are: aluminum oxide 75-89%; titanium dioxide 10-20%; and molybdenum disulfide 1-5%.

[0006] According to another aspect of the present invention, there is provided a method for preparing the above-mentioned sliding bearing for a dual-mass flywheel, comprising the following steps: preparing a bearing body and a powder material for forming a self-lubricating coating, the powder material comprising Al2O3-TiO2 ceramic powder and molybdenum disulfide powder; preparing an adhesive layer on the surface of the bearing body; and using plasma spraying technology to spray the powder material on the adhesive layer to form a self-lubricating coating.

[0007] The embodiment of the present application provides a sliding bearing for a dual-mass flywheel and a preparation method thereof. The sliding bearing for the dual-mass flywheel forms a self-lubricating coating on the surface of the bearing body with aluminum oxide, titanium dioxide and molybdenum disulfide. Based on the wear resistance, high temperature resistance, oxidation resistance and high thermal expansion coefficient of Al2O3, TiO2 is used to improve the thermal shock resistance and fracture toughness of Al2O3, while improving its hardness and bonding strength. Finally, MoS2 is selected as the lubricating material, which greatly improves the impact resistance and wear resistance of the sliding bearing, thereby extending the service life mileage of the dual-mass flywheel, improving the comfort of commercial vehicles or passenger vehicles, and improving the NVH performance of the vehicle. The preparation method uses plasma spraying technology to form a dense, high-quality self-lubricating coating on the bearing body, effectively ensuring the performance of the sliding bearing in the dual-mass flywheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0009] Figure 1 It is a picture of the background art sliding bearing structure;

[0010] Figure 2 It is a structural schematic diagram of the sliding bearing of the present invention;

[0011] Figure 3 It is a schematic diagram of a posture of the bearing body of the present invention being fixed on an adjustable turntable;

[0012] Figure 4 It is a schematic diagram of another posture of the bearing body of the present invention being fixed on the adjustable turntable.

[0013] The reference numerals in the accompanying drawings represent the following: 1. bearing body; 2. self-lubricating coating; 3. adhesive layer; 4. base; 5. fixing column; 6. first side surface; 7. second side surface. DETAILED DESCRIPTION

[0014] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0015] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0016] Examples of apparatus and methods consistent with aspects of the present application.

[0017] In the description of the present application, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances. In addition, in the description of the present application, unless otherwise specified, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0018] The present application embodiment discloses a sliding bearing for a dual mass flywheel, such as Figure 2 As shown, the sliding bearing comprises a bearing body 1 and a self-lubricating coating 2. The self-lubricating coating 2 is bonded to the surface of the bearing body 1. The components of the self-lubricating coating 2 include aluminum oxide, titanium dioxide and molybdenum disulfide.

[0019] In the present invention, the contents of the components of the self-lubricating coating 2 are as follows, by weight percentage:

[0020] Aluminum oxide 75-89%;

[0021] Titanium dioxide 10-20%;

[0022] Molybdenum disulfide 1-5%.

[0023] By using the sliding bearing in the technical solution, a self-lubricating coating 2 is formed on the outer side of the bearing body 1 with aluminum oxide, titanium dioxide and molybdenum disulfide. Based on the wear resistance, high temperature resistance, oxidation resistance and high thermal expansion coefficient of Al2O3, TiO2 is used to improve the thermal shock resistance and fracture toughness of Al2O3, while improving its hardness and bonding strength. Finally, MoS2 is selected as the lubricating material, which can greatly improve the impact resistance and wear resistance of the sliding bearing, thereby extending the service life mileage of the dual-mass flywheel, improving the comfort of commercial vehicles or passenger vehicles, and improving the NVH performance of the vehicle.

[0024] At the same time, the present invention forms a self-lubricating coating 2 on the bearing body 1 according to the above ratio, so that the self-lubricating coating 2 has excellent impact resistance, wear resistance and self-lubricating properties, and can effectively ensure the performance of the sliding bearing on the dual-mass flywheel.

[0025] Preferably, in terms of weight percentage, the content of each component of the self-lubricating coating 2 is:

[0026] Aluminum oxide 85%;

[0027] Titanium dioxide 13%;

[0028] Molybdenum disulfide 2%.

[0029] In some embodiments of the present invention, the thickness of the self-lubricating coating 2 is 80-150 μm.

[0030] It should be noted that the thickness of the self-lubricating coating 2 is not particularly limited, and those skilled in the art can make a reasonable choice according to actual needs. As some specific examples, the thickness of the self-lubricating coating 2 can be 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 140μm or 150μm, etc.

[0031] In some embodiments of the present invention, Figure 2 As shown, the sliding bearing further comprises an adhesive layer 3 , which is connected between the surface of the bearing body 1 and the self-lubricating coating 2 .

[0032] The bonding layer serves as a transition layer, which can better achieve the combination of the bearing body 1 and the self-lubricating coating 2.

[0033] In some embodiments of the present invention, the bonding layer 3 is selected from nickel-aluminum material; the thickness of the bonding layer is controlled to be about 50 μm, preferably 45-55 μm; preferably, the content of each component in the nickel-aluminum material is 95% nickel and 5% aluminum.

[0034] In some embodiments of the present invention, the material of the bearing body may be selected from 45# steel.

[0035] This embodiment also proposes a method for preparing the above-mentioned sliding bearing for a dual-mass flywheel, the preparation method comprising the following steps:

[0036] S1. Prepare a bearing body, a raw material for forming a bonding layer, and a powder material for forming a self-lubricating coating.

[0037] The bonding layer and the self-lubricating coating in the present invention are both formed by plasma spraying technology, wherein the raw material used to form the bonding layer is nickel aluminum powder; the powder material used to form the self-lubricating coating includes Al2O3-TiO2 ceramic powder and molybdenum disulfide powder, and the Al2O3-TiO2 ceramic powder and molybdenum disulfide powder are uniformly mixed.

[0038] In some embodiments of the present invention, the particle size of the Al2O3-TiO2 ceramic powder is 15 to 50 μm.

[0039] In some embodiments of the present invention, the Al2O3-TiO2 ceramic powder can be Al2O3-13TiO2 ceramic powder, and the molybdenum disulfide powder can be a powder with a molybdenum disulfide content of 99.9%, forming a powder with 85% aluminum oxide, 13% titanium dioxide, and 2% molybdenum disulfide.

[0040] S2. preparing an adhesive layer on the surface of the bearing body.

[0041] The bonding layer is formed by using nickel-aluminum powder and ion spraying equipment, and the thickness of the bonding layer is controlled to be about 50 μm.

[0042] In some embodiments of the present invention, before preparing the adhesive layer, the surface of the bearing body may be ultrasonically cleaned with deionized water for 15 minutes, and then sandblasted after being taken out and dried.

[0043] S3. Use plasma spraying technology to spray powder material onto the bonding layer to form a self-lubricating coating.

[0044] The self-lubricating coating was prepared by ion spraying equipment using powder materials for forming the self-lubricating coating. The process parameters were adjusted as follows: current 410A, power 90kW, Ar flow rate 5.0m 3 / min, N2 flow rate 3.5m 3 / min, H2 flow rate 3.5m 3 / min, powder feeding amount 60g / min, spraying distance 120mm, spray gun moving speed 800mm / s.

[0045] In some embodiments of the present invention, when preparing the adhesive layer and the self-lubricating coating, an adjustable turntable is used to fix the bearing body, such as Figure 3 and Figure 4As shown, the adjustable turntable includes a cylindrical base 4 and a fixed column 5 coaxially connected to the base, the bearing body 1 is sleeved on the fixed column, the driving base 4 can drive the fixed column 5 to rotate around the central axis of the fixed column 5, and the fixed column 5 can be adjusted to a vertical state or a horizontal state using the base 4.

[0046] like Figure 3 and Figure 4 As shown, the outer side surface of the bearing body 1 is composed of a first side surface 6 and a second side surface 7, wherein the second side surface 7 is an outward extension of the first side surface 6. When preparing an adhesive layer or a self-lubricating coating on the first side surface 6 of the bearing body 1, the base 4 is used to adjust the fixed column 5 to a vertical state, and then the base 4 is driven to drive the fixed column 5 to rotate around the central axis of the fixed column 5, so that the ion spraying equipment sprays the first side surface 6. When preparing an adhesive layer or a self-lubricating coating on the second side surface 7 of the bearing body 1, the base 4 is used to adjust the fixed column 5 to a horizontal state, and then the base 4 is driven to drive the fixed column 5 to rotate around the central axis of the fixed column 5, so that the ion spraying equipment sprays the second side surface 7.

[0047] By using the preparation method of the present invention, a dense, high-quality self-lubricating coating can be formed on the bearing body, which can effectively ensure the performance of the sliding bearing in the dual-mass flywheel.

[0048] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A sliding bearing for a dual mass flywheel, characterized in that: include: Bearing body; A self-lubricating coating, the self-lubricating coating is bonded to the surface of the bearing body, and the components of the self-lubricating coating include aluminum oxide, titanium dioxide and molybdenum disulfide; In terms of weight percentage, the content of each component of the self-lubricating coating is: Aluminum oxide 75-89%; Titanium dioxide 10-20%; Molybdenum disulfide 1-5%.

2. The sliding bearing for a dual mass flywheel according to claim 1, characterized in that In terms of weight percentage, the content of each component of the self-lubricating coating is: Aluminum oxide 85%; Titanium dioxide 13%; Molybdenum disulfide 2%.

3. The sliding bearing for a dual mass flywheel according to claim 1, characterized in that: The thickness of the self-lubricating coating is 80-150 μm.

4. The sliding bearing for a dual mass flywheel according to claim 1, characterized in that: Also includes: An adhesive layer is connected between the surface of the bearing body and the self-lubricating coating.

5. The sliding bearing for a dual mass flywheel according to claim 4, characterized in that: The bonding layer is selected from nickel-aluminum materials, and the thickness of the bonding layer is 45-55 μm.

6. A method for preparing a sliding bearing for a dual mass flywheel according to claim 4 or 5, characterized in that: The following steps are involved: Preparing a bearing body and a powder material for forming a self-lubricating coating, wherein the powder material comprises Al2O3-TiO2 ceramic powder and molybdenum disulfide powder; preparing an adhesive layer on the surface of the bearing body; The powder material is sprayed onto the bonding layer by plasma spraying technology to form a self-lubricating coating.

7. The preparation method according to claim 6, characterized in that: Before preparing the bonding layer, the surface of the bearing body is ultrasonically cleaned with deionized water, taken out, dried, and then sandblasted.

8. The preparation method according to claim 6, characterized in that: The process parameters of the plasma spraying are: current 410A, power 90kW, Ar flow rate 5.0m 3 / min, N2 flow rate 3.5m 3 / min, H2 flow rate 3.5m 3 / min, powder feeding amount 60g / min, spraying distance 120mm, spray gun moving speed 800mm / s.

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