A lubricating material for high speed bearings, a method for producing the same and a high speed bearing

Abstract

The application belongs to the field of bearing lubrication, and particularly relates to a lubricating material suitable for high-speed bearings, a preparation method of the lubricating material and a high-speed bearing. The lubricating material is prepared by blending and melting high-molecular polymers, lubricating grease, oil-absorbing fibers and modified additives in a specific proportion, and has a microporous structure inside. The lubricating grease is efficiently released by capillary force and is resistant to centrifugal force oil throwing. The material is injection molded on a bearing retainer to form a solid lubricating layer, so that the bearing has low temperature rise and long service life under high-speed working conditions. The application solves the failure problem of traditional lubrication methods under high speed, and is suitable for high-speed scenes such as deep groove ball bearings or outer spherical surface bearings.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of bearing lubrication, and particularly relates to a lubricating material suitable for high-speed bearings and a preparation method thereof and a high-speed bearing. BACKGROUND

[0002] As a core component in mechanical transmission systems, the lubrication performance of bearings directly affects the operation efficiency and service life of equipment. Traditional lubrication methods mainly rely on oil lubrication or grease lubrication. However, under high-speed (high rotational speed or high centrifugal force) working conditions, lubricating oil and grease are easily thrown out by centrifugal force, leading to lubrication failure and further causing bearing wear, excessive temperature rise, and even early failure.

[0003] In the prior art, solid lubricants can partially solve the problem of oil throwing, but there is a common problem that the lubricating oil and grease are sealed inside the material and cannot be effectively released. For example, the solid lubricant described in patent CN117247802A has a significantly insufficient lubricant utilization rate due to the closed hollow structure, which cannot meet the long-term lubrication needs of high-speed bearings. In addition, the problem of temperature rise of bearings under high-speed working conditions also needs to be solved. Therefore, there is an urgent need to develop a lubricating material and bearing structure that has high lubrication efficiency, anti-centrifugal force characteristics, and excellent heat dissipation performance.

[0004] Therefore, the technical scheme of the present application is proposed. SUMMARY

[0005] In view of the problems of existing high-speed bearing lubricating oil and grease being easily thrown out, low lubrication efficiency, high temperature rise, and short service life, the present application provides a lubricating material suitable for high-speed bearings and a preparation method thereof, as well as a high-speed bearing using the lubricating material, aiming to achieve long-term stable lubrication of bearings under high-speed or high centrifugal force working conditions.

[0006] The present application provides a preparation method of a lubricating material suitable for high-speed bearings, which comprises the following steps:

[0007] (1) uniformly blending a high molecular polymer, lubricating grease, oil-absorbing fiber, and modified additive to obtain a mixture;

[0008] (2) melting, extruding, and granulating the mixture to obtain the lubricating material suitable for high-speed bearings.

[0009] Preferably, the high molecular polymer is one of polyethylene, polypropylene, and polyvinyl chloride, or a combination of two or more thereof.

[0010] And / or, the number average molecular weight of the high molecular polymer is 1 x 10 6 ~5 x 10 6 Da.

[0011] Preferably, the lubricating grease is semi-synthetic or full-synthetic. The relevant products of brands such as Mobil / Koehler can be selected.

[0012] Preferably, the oil-absorbing fiber is one or a combination of two or more of glass fiber, carbon fiber, and polyester fiber.

[0013] Preferably, the modifying additive is one or a combination of two of lubricant and toughening agent.

[0014] Preferably, the lubricant is magnesium stearate and / or calcium stearate.

[0015] Preferably, the toughening agent is styrene-butadiene-styrene copolymer (SBS) or acrylonitrile-butadiene-styrene copolymer (ABS).

[0016] Preferably, the weight ratio of the high-molecular polymer, the lubricating grease, the oil-absorbing fiber, and the modifying additive is 10-40:60-90:10-30:1-3.

[0017] Preferably, the temperature of the melting is 170-200℃.

[0018] Based on the same technical concept, another aspect of the present application provides a lubricating material for high-speed bearings prepared by the above method.

[0019] Based on the same technical concept, another aspect of the present application provides a high-speed bearing prepared by the above lubricating material by injection molding and curing the lubricating material on a bearing steel holder.

[0020] Preferably, the bearing is a deep groove ball bearing or an outer spherical bearing.

[0021] The lubricating material and the high-speed bearing of the present application have the following advantages:

[0022] 1. Efficient lubrication and anti-oil-throwing performance: the microporous network (pore size 1-2 µm) constructed by oil-absorbing fibers (such as glass fiber and carbon fiber) continuously delivers the lubricating grease to the friction surface by capillary force, the utilization rate of lubricant is close to 100%, and the microporous capillary tension is much higher than the centrifugal force, which completely avoids the throwing of grease.

[0023] 2. Excellent heat dissipation: the high thermal conductivity and microporous structure of the oil-absorbing fiber accelerate heat diffusion, which reduces the temperature rise of the bearing by 20-30% compared with the traditional lubrication method when the bearing is running at high speed.

[0024] 3. Long service life and stability: the synergistic effect of high molecular polymer (such as polyethylene, polypropylene) and modified additive (such as magnesium stearate) endows the material with excellent mechanical strength and anti-aging performance, and the service life of the bearing is prolonged by more than 3 times.

[0025] 4. Wide applicability: suitable for various types of deep groove ball bearings, outer spherical surface bearings and the like, and the process is simple and easy for industrialized production. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0027] Figure 1 is a product of high-speed bearing. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present application more clear, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of the present application.

[0029] Embodiment 1

[0030] The present embodiment provides a preparation method of a lubricating material suitable for high-speed bearings, which comprises the following steps:

[0031] (1) Put 100 g of polyethylene, 600 g of semi-synthetic lubricating grease, 100 g of glass fiber and 10 g of magnesium stearate into a mixer, uniformly blend for 15 min, and obtain a mixture;

[0032] (2) Put the mixture into a double-screw extruder, melt extrude at 170℃ and screw speed of 200 r / min, water-cool and granulate to obtain solid lubricating particles with particle size of about 3 mm.

[0033] Embodiment 2

[0034] The present embodiment provides a preparation method of a high-speed bearing, which is:

[0035] (1) Inject the lubricating particles obtained in embodiment 1 into the barrel of an injection molding machine, heat to 180℃ to melt;

[0036] (2) The molten material is injected into the steel retainer roller gap of the bearing, and is pressure-kept, cooled and solidified to form a continuous solid lubricating layer (thickness 1.5 mm), thereby finally obtaining a high-speed bearing (suitable for bearings under high rotation speed or high centrifugal force).

[0037] The high-speed bearing is as shown in the figure. Figure 1 The brown solid between the adjacent rollers is the lubricating material, which is in a solid state.

[0038] Example 3

[0039] The embodiment provides a preparation method of a lubricating material suitable for a high-speed bearing, and the preparation method comprises the following steps:

[0040] (1) 400 g of polypropylene, 900 g of full synthetic lubricating grease, 300 g of carbon fiber and 30 g of calcium stearate are put into a mixer and uniformly blended for 20 min to obtain a mixture;

[0041] (2) The mixture is put into a double-screw extruder and is melt-extruded at 170 DEG C and a screw rotation speed of 200 r / min, and is water-cooled and granulated to obtain solid lubricating particles with a particle size of about 3 mm.

[0042] Example 4

[0043] The embodiment provides a preparation method of a high-speed bearing, and the preparation method is as follows:

[0044] (1) The lubricating particles obtained in Example 3 are injected into a barrel of an injection molding machine and are heated to 180 DEG C to be molten;

[0045] (2) The molten material is injected into the steel retainer roller gap of the bearing, and is pressure-kept, cooled and solidified to form a continuous solid lubricating layer (thickness 1.5 mm), thereby finally obtaining a high-speed bearing (suitable for bearings under high rotation speed or high centrifugal force).

[0046] Example 5

[0047] The embodiment provides a preparation method of a lubricating material suitable for a high-speed bearing, and the preparation method comprises the following steps:

[0048] (1) 250 g of polyvinyl chloride, 750 g of full synthetic lubricating grease, 200 g of polyester fiber and 20 g of SBS toughening agent are put into a mixer and uniformly blended for 20 min to obtain a mixture;

[0049] (2) The mixture is put into a double-screw extruder and is melt-extruded at 170 DEG C and a screw rotation speed of 200 r / min, and is water-cooled and granulated to obtain solid lubricating particles with a particle size of about 3 mm.

[0050] Example 6

[0051] The embodiment provides a preparation method of a high-speed bearing, and the preparation method is as follows:

[0052] (1) The lubricating particles obtained in the embodiment 5 are injected into a barrel of an injection molding machine, and are heated to 180 DEG C to be melted;

[0053] (2) The melted material is injected into a steel retainer roller gap of the bearing, and is pressure-kept, cooled and solidified to form a continuous solid lubricating layer (thickness 1.5 mm), so that the high-speed bearing (which is suitable for the bearing under high rotating speed or high centrifugal force) is finally prepared.

[0054] Verification example

[0055] The high-speed bearing prepared in the embodiment 2 (the application) is compared with a conventional grease lubricating bearing of the same specification for test, and the results are as follows:

[0056] 1. Rotating speed limit test: under the condition of an axial load of 50 N, the highest rotating speed of the bearing of the application reaches 10000 rpm (the conventional bearing is only 6000 rpm), and no grease is thrown out.

[0057] 2. Temperature rise test: after continuous operation for 8 hours, the temperature of the outer ring of the bearing of the application is only 65 DEG C (the temperature of the conventional bearing reaches 75 DEG C).

[0058] 3. Service life test: under the working condition of 15000 rpm, the service life of the bearing of the application is more than 5000 hours (the service life of the conventional bearing is 1500 hours).

[0059] 4. Lubricant utilization rate: the grease release rate of the lubricating material of the application is greater than or equal to 98% measured by the weighing method, which is much higher than 30% of the conventional solid lubricant.

[0060] In summary, the advantages of the application are mainly embodied in the continuous supply of lubrication, which ensures that the grease leakage rate of the bearing is lower and the service life is longer.

[0061] The above merely describes the specific embodiments of the application, but the protection scope of the application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the application, which should be covered in the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A method for preparing a lubricating material suitable for high-speed bearings, characterized in that, The preparation method includes the following steps: (1) The polymer, lubricating grease, oil-absorbing fiber and modified additive are uniformly blended to obtain a mixture; wherein: The polymer is one or a combination of two or more of polyethylene, polypropylene, and polyvinyl chloride; the number average molecular weight of the polymer is 1×10⁻⁶. 6 ~5×10 6 Da; The lubricating grease is a semi-synthetic lubricating grease or a fully synthetic lubricating grease; The oil-absorbing fiber is one or a combination of two or more of glass fiber, carbon fiber, and polyester fiber; The modified additive is one or a combination of two of the following: a lubricant or a toughening agent; the lubricant is magnesium stearate and / or calcium stearate; the toughening agent is styrene-butadiene-styrene copolymer or acrylonitrile-butadiene-styrene copolymer. (2) The mixture is melted, extruded and granulated to obtain the lubricating material suitable for high-speed bearings.

2. The method for preparing a lubricating material suitable for high-speed bearings according to claim 1, characterized in that, The weight ratio of the polymer, lubricating grease, oil-absorbing fiber and modified additive is 10~40:60~90:10~30:1~3.

3. The method for preparing a lubricating material suitable for high-speed bearings according to claim 1, characterized in that, The melting temperature is 170~200℃.

4. A lubricating material suitable for high-speed bearings obtained by the preparation method according to any one of claims 1 to 3.

5. A high-speed bearing, characterized in that, The high-speed bearing is prepared using the lubricating material described in claim 4, and the preparation method is as follows: the lubricating material is injection molded and cured onto the bearing steel retainer to obtain the high-speed bearing.

6. The high-speed bearing according to claim 5, characterized in that, The bearing is a deep groove ball bearing or an outer spherical bearing.

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