Lubricating material suitable for high-speed bearing, preparation method of lubricating material and high-speed bearing

Abstract

The invention belongs to the field of bearing lubrication, and particularly relates to a lubricating material suitable for a high-speed bearing, a preparation method of the lubricating material and the high-speed bearing. The lubricating material is prepared by blending and melting a high-molecular polymer, lubricating grease, oil absorption fibers and a modified additive according to a specific proportion, the lubricating material is internally provided with a microporous structure, efficient release of the lubricating grease is achieved through capillary force, and centrifugal force oil throwing is resisted. The material is injected on a bearing retainer to form a solid lubricating layer, so that the bearing is low in temperature rise and long in service life under a high-speed working condition. The invention solves the problem of failure of the traditional lubrication mode at high rotating speed, and is suitable for high-speed scenes such as deep groove ball bearings or insert bearings.

Description

Technical Field

[0001] The present invention belongs to the field of bearing lubrication, and in particular relates to a lubricating material suitable for high-speed bearings, a preparation method thereof, and a high-speed (high-speed or high-centrifugal-force) bearing. Background Art

[0002] Bearings are core components in mechanical transmission systems, and their lubrication performance directly impacts the equipment's operating efficiency and service life. Traditional lubrication methods rely primarily on oil or grease. However, under high-speed operating conditions (high rotational speed or high centrifugal force), the grease is easily thrown out by centrifugal force, leading to lubrication failure, which in turn causes bearing wear, excessive temperature rise, and even premature failure.

[0003] While existing solid lubricants can partially address the oil-shedding problem, they also commonly trap the lubricant within the material, preventing it from being effectively released. For example, the solid lubricant described in patent CN117247802A, due to its closed, hollow structure, results in significantly insufficient lubricant utilization, making it difficult to meet the long-term lubrication needs of high-speed bearings. Furthermore, the temperature rise of bearings under high-speed operating conditions is an urgent issue that needs to be addressed. Therefore, there is an urgent need to develop a lubricating material and bearing structure that combines high lubrication efficiency, centrifugal resistance, and excellent heat dissipation.

[0004] Therefore, based on this, the technical solution of the present invention is proposed. Summary of the Invention

[0005] In response to the problems in the prior art such as high-speed bearing grease being easily thrown out, low lubrication efficiency, increased temperature and short life, the present invention 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 and stable lubrication of the bearing under high speed or high centrifugal force conditions.

[0006] The present invention provides a method for preparing a lubricating material suitable for high-speed bearings, the method comprising the following steps: (1) uniformly blending a high molecular weight polymer, lubricating grease, oil-absorbing fiber, and a modified additive to obtain a mixture; (2) The mixture is melted, extruded, and granulated to obtain the lubricating material suitable for high-speed bearings.

[0007] Preferably, the high molecular polymer is one or a combination of two or more of polyethylene, polypropylene, and polyvinyl chloride; And / or, the number average molecular weight of the high molecular weight polymer is 1×10 6 ~5×10 6 Da.

[0008] Preferably, the lubricating grease is a semi-synthetic lubricating grease or a fully synthetic lubricating grease, and relevant products of brands such as Mobil / Krupp can be selected.

[0009] Preferably, the oil-absorbing fiber is one or a combination of two or more of glass fiber, carbon fiber, and polyester fiber.

[0010] Preferably, the modifying additive is one or a combination of a lubricant or a toughening agent; And / or, the lubricant is magnesium stearate and / or calcium stearate; And / or, the toughening agent is styrene-butadiene-styrene copolymer (SBS) or acrylonitrile-butadiene-styrene copolymer (ABS).

[0011] Preferably, the weight ratio of the high molecular polymer, lubricating grease, oil-absorbing fiber and modifying additive is 10-40:60-90:10-30:1-3.

[0012] Preferably, the melting temperature is 170-200°C.

[0013] Based on the same technical concept, another solution of the present invention is to provide a lubricating material suitable for high-speed bearings obtained by the above preparation method.

[0014] Based on the same technical concept, another solution of the present invention is to provide a high-speed bearing, which is prepared using the above-mentioned lubricating material. The preparation method is: injecting and curing the lubricating material on a bearing steel retainer to obtain the high-speed bearing.

[0015] Preferably, the bearing is a deep groove ball bearing or an outer spherical bearing.

[0016] The lubricating material and high-speed bearing of the present invention have the following significant advantages: 1. Efficient lubrication and anti-oil throwing performance: The microporous network (pore size 1~2µm) constructed by oil-absorbing fibers (such as glass fiber and carbon fiber) uses capillary force to continuously transport lubricating grease to the friction surface. The lubricant utilization rate is close to 100%, and the micropore capillary tension is much higher than the centrifugal force, completely preventing grease from being thrown out.

[0017] 2. Excellent heat dissipation: The high thermal conductivity and microporous structure of the oil-absorbing fiber accelerate heat diffusion, reducing the temperature rise of the bearing at high speed by 20% to 30% compared with traditional lubrication methods.

[0018] 3. Long life and stability: The synergistic effect of high molecular polymers (such as polyethylene, polypropylene) and modified additives (such as magnesium stearate) gives the material excellent mechanical strength and anti-aging properties, extending the bearing life by more than 3 times.

[0019] 4. Wide applicability: It is suitable for various types of bearings such as deep groove ball bearings and outer spherical bearings, and the process is simple and easy to industrialize. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a real product photo of a high-speed bearing. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0023] Example 1 This embodiment provides a method for preparing a lubricating material suitable for high-speed bearings, the method comprising the following steps: (1) 100 g of polyethylene, 600 g of semi-synthetic lubricating grease, 100 g of glass fiber and 10 g of magnesium stearate were placed in a mixer and uniformly blended for 15 min to obtain a mixture; (2) The mixture was fed into a twin-screw extruder and melt-extruded at 170°C and a screw speed of 200 r / min. After water cooling and pelletizing, solid lubricating particles with a particle size of about 3 mm were obtained.

[0024] Example 2 This embodiment provides a method for preparing a high-speed bearing, the preparation method comprising: (1) Inject the lubricating particles obtained in Example 1 into the barrel of an injection molding machine and heat to 180°C to melt them; (2) The molten material is injected into the gap between the steel retainer rollers of the bearing, cooled and solidified under pressure to form a continuous solid lubrication layer (thickness 1.5 mm), and finally a high-speed bearing (suitable for bearings under high speed or high centrifugal force) is produced.

[0025] High-speed bearings such as Figure 1 As shown, the brown solid between adjacent rollers is the lubricating material, which is in solid state.

[0026] Example 3 This embodiment provides a method for preparing a lubricating material suitable for high-speed bearings, the method comprising the following steps: (1) 400 g of polypropylene, 900 g of fully synthetic lubricating grease, 300 g of carbon fiber and 30 g of calcium stearate were placed in a mixer and uniformly blended for 20 min to obtain a mixture; (2) The mixture was fed into a twin-screw extruder and melt-extruded at 170°C and a screw speed of 200 r / min. After water cooling and pelletizing, solid lubricating particles with a particle size of about 3 mm were obtained.

[0027] Example 4 This embodiment provides a method for preparing a high-speed bearing, the preparation method comprising: (1) Inject the lubricating particles obtained in Example 3 into the barrel of an injection molding machine and heat to 180°C to melt them; (2) The molten material is injected into the gap between the steel retainer rollers of the bearing, cooled and solidified under pressure to form a continuous solid lubrication layer (thickness 1.5 mm), and finally a high-speed bearing (suitable for bearings under high speed or high centrifugal force) is produced.

[0028] Example 5 This embodiment provides a method for preparing a lubricating material suitable for high-speed bearings, the method comprising the following steps: (1) 250 g of polyvinyl chloride, 750 g of fully synthetic lubricating grease, 200 g of polyester fiber and 20 g of SBS toughening agent were placed in a mixer and uniformly blended for 20 min to obtain a mixture; (2) The mixture was fed into a twin-screw extruder and melt-extruded at 170°C and a screw speed of 200 r / min. After water cooling and pelletizing, solid lubricating particles with a particle size of about 3 mm were obtained.

[0029] Example 6 This embodiment provides a method for preparing a high-speed bearing, the preparation method comprising: (1) Inject the lubricating particles obtained in Example 5 into the barrel of an injection molding machine and heat to 180°C to melt them; (2) The molten material is injected into the gap between the steel retainer rollers of the bearing, cooled and solidified under pressure to form a continuous solid lubrication layer (thickness 1.5 mm), and finally a high-speed bearing (suitable for bearings under high speed or high centrifugal force) is produced. Verification Example The high-speed bearing prepared in Example 2 (the present invention) was compared with a conventional grease-lubricated bearing of the same specification. The results are as follows: 1. Speed ​​limit test: Under the condition of axial load of 50N, the maximum speed of the bearing of the present invention reaches 10000rpm (conventional bearings are only 6000rpm) without grease being thrown out.

[0030] 2. Temperature rise test: After running continuously for 8 hours, the outer ring temperature of the bearing of the present invention is only 65°C (the temperature of the conventional bearing reaches 75°C).

[0031] 3. Life test: Under the working condition of 15000rpm, the life of the bearing of the present invention exceeds 5000 hours (the traditional bearing is 1500 hours).

[0032] 4. Lubricant utilization rate: The grease release rate of the lubricating material of the present invention is measured by weighing method to be ≥98%, which is much higher than the 30% of traditional solid lubricants.

[0033] In summary, the advantages of the present invention are mainly reflected in the continuous supply of lubrication, which ensures a lower grease leakage rate and a longer service life of the bearing.

[0034] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A method for preparing a lubricating material suitable for high-speed bearings, characterized in that: The preparation method comprises the following steps: (1) uniformly blending a high molecular weight polymer, lubricating grease, oil-absorbing fiber, and a modified additive to obtain a mixture; (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 high molecular polymer is one or a combination of two or more of polyethylene, polypropylene, and polyvinyl chloride; And / or, the number average molecular weight of the high molecular weight polymer is 1×10 6 ~5×10 6 Da.

3. The method for preparing a lubricating material suitable for high-speed bearings according to claim 1, characterized in that: The lubricating grease is a semi-synthetic lubricating grease or a fully synthetic lubricating grease.

4. The method for preparing a lubricating material suitable for high-speed bearings according to claim 1, characterized in that: The oil-absorbing fiber is one or a combination of two or more of glass fiber, carbon fiber and polyester fiber.

5. The method for preparing a lubricating material suitable for high-speed bearings according to claim 1, characterized in that: The modifying additive is one or a combination of a lubricant or a toughening agent; And / or, the lubricant is magnesium stearate and / or calcium stearate; And / or, the toughening agent is styrene-butadiene-styrene copolymer or acrylonitrile-butadiene-styrene copolymer.

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

7. 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°C.

8. A lubricating material suitable for high-speed bearings obtained by the preparation method according to any one of claims 1 to 7.

9. A high-speed bearing, characterized in that: The high-speed bearing is prepared by using the lubricating material according to claim 8, and the preparation method is: the lubricating material is injection molded and solidified on a bearing steel retainer to obtain the high-speed bearing.

10. The high-speed bearing according to claim 9, characterized in that: The bearing is a deep groove ball bearing or an outer spherical bearing.

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