Corrosion-resistant deep groove ball bearing

Abstract

The utility model belongs to the technical field of bearings, and particularly relates to a corrosion-resistant deep groove ball bearing, which comprises an inner ring, an outer ring, a rolling body arranged between the inner ring and the outer ring, and a retainer for retaining the rolling body, first corrosion-resistant layers are arranged on the surfaces of raceways of the inner ring and the outer ring, second corrosion-resistant layers are arranged on the surfaces of the rolling bodies, and the first corrosion-resistant layers and the second corrosion-resistant layers are arranged on the surfaces of the raceways of the inner ring and the outer ring. The retainer is made of a corrosion-resistant material; the bearing further comprises sealing assemblies arranged at the two ends of the inner ring and the two ends of the outer ring, chemical nickel-plated phosphorus alloy coatings are arranged on the surfaces of raceways of the inner ring and the outer ring, PVD titanium nitride coatings are arranged on the surfaces of the rolling bodies, and the retainer is made of corrosion-resistant materials, so that a multi-layer corrosion-resistant protection structure is formed, and the corrosion resistance of the bearing is effectively improved.

Description

Technical Field

[0001] This utility model belongs to the field of bearing technology, specifically a corrosion-resistant deep groove ball bearing. Background Technology

[0002] With social development, deep groove ball bearings are often needed in other fields such as industry, automobiles, home appliances, power tools, consumer electronics and precision instruments.

[0003] Deep groove ball bearings are the most common type of rolling bearings. They are characterized by simple structure, low friction, low cost, and wide application. Deep groove ball bearings are usually composed of an inner ring, an outer ring, rolling elements, and a cage.

[0004] In existing technologies, long-term observation has revealed that although existing deep groove ball bearings use stainless steel materials or surface coatings to improve their corrosion resistance, the surface coatings formed by methods such as chemical plating, electroplating, or physical vapor deposition are subject to repeated compression, friction, and impact loads between the rolling elements and raceways during long-term operation. These forces may cause a decrease in the bonding force between the coating and the substrate, leading to the gradual peeling of the coating. Once the coating is damaged, the unprotected metal substrate will be rapidly corroded. Therefore, a corrosion-resistant deep groove ball bearing is proposed to address the above problems. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, this utility model proposes a corrosion-resistant deep groove ball bearing.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: A corrosion-resistant deep groove ball bearing of this utility model includes an inner ring, an outer ring, rolling elements disposed between the inner and outer rings, and a cage for retaining the rolling elements. The raceway surfaces of both the inner and outer rings are provided with a first corrosion-resistant layer, and the surface of the rolling elements is provided with a second corrosion-resistant layer. The cage is made of a corrosion-resistant material. The bearing also includes sealing assemblies disposed at both ends of the inner and outer rings. Each sealing assembly includes a sealing seat fixedly connected to the outer ring and a sealing cover fixedly connected to the inner ring. A labyrinth seal structure is formed between the sealing seat and the sealing cover. The surfaces of both the sealing seat and the sealing cover are provided with a third corrosion-resistant layer. The bearing is filled with corrosion-resistant grease containing rust inhibitors and corrosion inhibitors.

[0007] Preferably, the first corrosion-resistant layer is a chemically plated nickel-phosphorus alloy coating with a thickness of 5-15 μm.

[0008] Preferably, the second corrosion-resistant layer is a physical vapor deposition (PVD) titanium nitride coating with a thickness of 1-5 μm.

[0009] Preferably, the retainer is made of polyetheretherketone (PEEK) or stainless steel.

[0010] Preferably, the third corrosion-resistant layer is an epoxy resin coating with a thickness of 10-30 μm.

[0011] Preferably, the labyrinth seal structure includes multiple cooperating annular protrusions and grooves, forming a tortuous sealing path between the annular protrusions and grooves.

[0012] Preferably, an elastic sealing ring is provided between the sealing seat and the sealing cover, and the elastic sealing ring is made of fluororubber or silicone rubber.

[0013] Preferably, the corrosion-resistant grease is a composite lithium-based grease or a polyurea-based grease, the rust inhibitor is a petroleum sulfonate, and the corrosion inhibitor is benzotriazole.

[0014] The beneficial effects of this utility model are:

[0015] This invention provides a corrosion-resistant deep groove ball bearing. By applying a chemically plated nickel-phosphorus alloy coating to the raceway surfaces of the inner and outer rings, a PVD titanium nitride coating to the rolling element surfaces, and a cage made of corrosion-resistant materials, a multi-layered corrosion-resistant protective structure is formed, effectively improving the bearing's corrosion resistance.

[0016] This utility model provides a corrosion-resistant deep groove ball bearing. By adopting a labyrinth seal structure and an elastic sealing ring for the sealing component, it can effectively prevent external corrosive media from entering the bearing. At the same time, the epoxy resin coating on the surface of the sealing seat and sealing cover further enhances the corrosion resistance of the sealing component.

[0017] This invention provides a corrosion-resistant deep groove ball bearing. The corrosion-resistant grease filled inside contains rust inhibitors and corrosion inhibitors, which can form a protective film inside the bearing to prevent rust and corrosion on the metal surface. At the same time, the grease itself has good chemical stability and can maintain its lubrication performance for a long time in corrosive environments.

[0018] This utility model provides a corrosion-resistant deep groove ball bearing. Through the coordinated work of various components, it not only improves the corrosion resistance of the bearing, but also does not affect the normal operation of the bearing. It has strong practicality and market promotion value. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0020] In the attached diagram:

[0021] Figure 1 This is a perspective view of the present invention;

[0022] Figure 2 This is a perspective view of the first corrosion-resistant layer in this utility model;

[0023] Figure 3 This is a perspective view of the corrosion-resistant lubricating grease in this utility model;

[0024] Figure 4 This is a perspective view of the sealing cap in this utility model.

[0025] Legend:

[0026] 1. Inner ring; 2. Outer ring; 3. Rolling element; 4. Cage; 5. Sealing assembly; 51. Sealing seat; 52. Sealing cap; 53. Annular protrusion; 54. Groove; 55. Elastic sealing ring; 6. First corrosion-resistant layer; 7. Second corrosion-resistant layer; 8. Third corrosion-resistant layer; 9. Corrosion-resistant grease. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0028] Specific implementation examples are given below.

[0029] Please see Figures 1-4This utility model provides a corrosion-resistant deep groove ball bearing, including an inner ring 1, an outer ring 2, rolling elements 3 disposed between the inner ring 1 and the outer ring 2, and a cage 4 holding the rolling elements 3. The raceway surfaces of the inner ring 1 and the outer ring 2 are each provided with a first corrosion-resistant layer 6, and the surface of the rolling elements 3 is provided with a second corrosion-resistant layer 7. The cage 4 is made of a corrosion-resistant material. The bearing also includes sealing assemblies 5 disposed at both ends of the inner ring 1 and the outer ring 2. Each sealing assembly 5 includes a sealing seat 51 fixedly connected to the outer ring 2 and a sealing cover 52 fixedly connected to the inner ring 1. A labyrinth seal structure is formed between the sealing seat 51 and the sealing cover 52. The surfaces of both the sealing seat 51 and the sealing cover 52 are provided with a third corrosion-resistant layer 8. The bearing is filled with corrosion-resistant grease 9, which contains rust inhibitors and corrosion inhibitors. During operation, the rolling elements 3 pass through the inner ring... 1. A first corrosion-resistant layer 6 is provided on the raceway surface of the outer ring 2 to isolate the metal substrate from the corrosive medium and inhibit electrochemical corrosion. A second corrosion-resistant layer 7 on the surface of the rolling element 3 improves its wear resistance and corrosion resistance and reduces the risk of pitting corrosion. The cage 4, made of corrosion-resistant material, avoids corrosion itself and ensures that the rolling elements 3 are evenly distributed. In the sealing assembly 5, the sealing seat 51 and sealing cover 52 block the intrusion of external moisture and dust through a tortuous path. A third corrosion-resistant layer 8 protects the sealing assembly 5 itself from corrosion. Corrosion-resistant grease 9 containing rust inhibitors and corrosion inhibitors forms a protective film inside the bearing to delay metal oxidation. This design is not only simple and convenient to operate, but also significantly improves the bearing's corrosion resistance in high humidity, acid and alkali, salt spray and other environments through the synergistic effect of coating, sealing and lubrication. At the same time, it reduces the risk of wear and seizure caused by corrosion, and reduces the maintenance frequency and replacement cost.

[0030] Furthermore, such as Figures 1-4 As shown, the first corrosion-resistant layer 6 is a chemically plated nickel-phosphorus alloy coating with a thickness of 5-15 μm. During operation, the first corrosion-resistant layer 6 forms a uniform and dense amorphous structure through electrochemical deposition, covering the micropores on the raceway surface and blocking the penetration path of corrosive media. The 5-15 μm thickness provides sufficient protection without affecting the bearing fitting accuracy. Through this design, it is metallurgically bonded to the substrate, making it difficult to fall off and ensuring long-term protection. Moreover, it can self-repair through passivation after local damage, delaying the spread of corrosion.

[0031] Furthermore, such as Figures 1-4 As shown, the second corrosion-resistant layer 7 is a physical vapor deposition (PVD) titanium nitride coating with a thickness of 1-5 μm. During operation, the second corrosion-resistant layer 7 forms a high-hardness ceramic layer HV2000+ on the surface of the rolling element 3 through physical vapor deposition, resisting rolling contact fatigue. The 1-5 μm ultra-thin coating maintains the original dimensional accuracy of the rolling element 3 while improving surface finish. Through this design, the titanium nitride coating remains stable above 300℃, making it suitable for high-temperature corrosive environments. At the same time, it reduces the coefficient of friction between the rolling element 3 and the raceway, reducing micropitting corrosion.

[0032] Furthermore, such as Figures 1-4 As shown, the cage 4 is made of polyetheretherketone (PEEK) or stainless steel. During operation, the PEEK cage 4 has self-lubricating properties, reducing frictional heat generation between it and the rolling elements 3. The stainless steel cage 4, such as 316L, forms a passivation film through a chromium-nickel alloy to resist oxidation. Through this design, the density of PEEK is only 1 / 5 that of steel, reducing the bearing's rotational inertia and making it suitable for high-speed applications. Moreover, PEEK is resistant to most organic solvents and acids and alkalis, while stainless steel is resistant to chloride ion corrosion.

[0033] Furthermore, such as Figures 1-4 As shown, the third corrosion-resistant layer 8 is an epoxy resin coating with a thickness of 10-30 μm. During operation, the third corrosion-resistant layer 8 forms a continuous and flexible protective film on the sealing seat 51 and sealing cover 52 by spraying or dipping, filling surface defects. The 10-30 μm thickness provides sufficient mechanical strength to resist fluid erosion and particle wear. This design effectively blocks water vapor and salt spray from contacting the metal substrate, preventing crevice corrosion. It is also resistant to ultraviolet aging and suitable for outdoor or humid environments.

[0034] Furthermore, such as Figures 1-4 As shown, the labyrinth seal structure includes multiple cooperating annular protrusions 53 and grooves 54, forming a tortuous sealing path between the annular protrusions 53 and grooves 54. During operation, the annular protrusions 53 and grooves 54 form a labyrinth path, extending the intrusion distance of corrosive media. The tortuous channel forces the media to turn multiple times, using centrifugal force and gravity to cause droplet deposition. Through this design, the tortuous sealing path formed between the annular protrusions 53 and grooves 54 can effectively prevent external corrosive media from entering the bearing.

[0035] Furthermore, such as Figures 1-4 As shown, an elastic sealing ring 55 is also provided between the sealing seat 51 and the sealing cover 52. The elastic sealing ring 55 is made of fluororubber or silicone rubber. During operation, the fluororubber or silicone rubber elastic sealing ring 55 fills the labyrinth gap to form a dynamic seal. This design of the elastic sealing ring 55 can further enhance the sealing effect and prevent corrosive media from entering the bearing through the gap of the labyrinth seal structure.

[0036] Furthermore, such as Figures 1-4As shown, the corrosion-resistant grease 9 uses a complex lithium-based grease or a polyurea-based grease, the rust inhibitor is petroleum sulfonate, and the corrosion inhibitor is benzotriazole. During operation, the complex lithium-based grease or polyurea-based grease serves as the base oil, providing high-temperature stability with a dropping point >200℃. Petroleum sulfonate forms a physical adsorption film on the metal surface, repelling water molecules; benzotriazole complexes with metal ions to form a chemical protective film, inhibiting electrochemical reactions. Through this design, these additives can form a protective film inside the bearing, preventing rust and corrosion on the metal surface. At the same time, the corrosion-resistant grease 9 itself has good chemical stability and can maintain lubrication performance for a long time in corrosive environments.

[0037] Working principle: A first corrosion-resistant layer 6 is formed on the raceway surfaces of the inner ring 1 and outer ring 2 to isolate the metal substrate from the corrosive medium and inhibit electrochemical corrosion. A second corrosion-resistant layer 7 on the surface of the rolling element 3 improves its wear resistance and corrosion resistance, reducing the risk of pitting corrosion. The cage 4, made of corrosion-resistant material, avoids corrosion itself and ensures uniform distribution of the rolling elements 3. The sealing seat 51 and sealing cover 52 in the sealing assembly 5 block the intrusion of external moisture and dust through a tortuous path. A third corrosion-resistant layer 8 protects the sealing assembly 5 itself from corrosion. A corrosion-resistant grease 9 containing rust inhibitors and corrosion inhibitors forms a protective film inside the bearing, delaying metal oxidation. The first corrosion-resistant layer 6 forms a uniform and dense amorphous structure through electrochemical deposition, covering the micropores on the raceway surface and blocking the penetration path of corrosive media. A thickness of 5-15μm provides sufficient protection without affecting the bearing's fitting accuracy. The second corrosion-resistant layer 7 forms a high-hardness ceramic layer HV2000+ on the surface of the rolling element 3 through physical vapor deposition, resisting rolling contact fatigue. A thickness of 1-5μm... The ultra-thin coating maintains the original dimensional accuracy of the rolling element 3 while improving surface finish. The PEEK material cage 4 is self-lubricating, reducing frictional heat generation between it and the rolling element 3. The stainless steel cage 4, such as 316L, forms a passivation film through a chromium-nickel alloy to resist oxidation. The third corrosion-resistant layer 8 is formed by spraying or dipping onto the sealing seat 51 and sealing cover 52 to form a continuous and flexible protective film, filling surface defects. Its 10-30μm thickness provides sufficient mechanical strength to resist fluid erosion and particle wear. The annular protrusion 53 and groove 54 form a labyrinth path, extending the penetration distance of corrosive media. The tortuous channel forces the media to change direction multiple times, using centrifugal force and gravity to deposit droplets. The fluororubber or silicone rubber elastic sealing ring 55 fills the labyrinth gaps to form a dynamic seal. The composite lithium-based grease or polyurea-based grease serves as the base oil, providing high-temperature stability with a dropping point >200℃. Petroleum sulfonate forms a physical adsorption film on the metal surface, repelling water molecules. Benzotriazole complexes with metal ions to form a chemical protective film, inhibiting electrochemical reactions.

[0038] The corrosion-resistant deep groove ball bearing of this invention forms a multi-layered corrosion-resistant protection system through the above-mentioned structural design, which can effectively resist the erosion of various corrosive media, extend the service life of the bearing, and reduce maintenance costs. It is particularly suitable for corrosive environments such as chemical industry, food processing, and marine engineering.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A corrosion-resistant deep groove ball bearing, comprising an inner ring (1), an outer ring (2), rolling elements (3) disposed between the inner ring (1) and the outer ring (2), and a cage (4) for retaining the rolling elements (3), characterized in that: The raceway surfaces of the inner ring (1) and the outer ring (2) are provided with a first corrosion-resistant layer (6), the surface of the rolling element (3) is provided with a second corrosion-resistant layer (7), and the cage (4) is made of corrosion-resistant material. The bearing also includes sealing components (5) disposed at both ends of the inner ring (1) and the outer ring (2). The sealing components (5) include a sealing seat (51) fixedly connected to the outer ring (2) and a sealing cover (52) fixedly connected to the inner ring (1). A labyrinth-type sealing structure is formed between the sealing seat (51) and the sealing cover (52). The surfaces of the sealing seat (51) and the sealing cover (52) are provided with a third corrosion-resistant layer (8). The bearing is filled with corrosion-resistant grease (9), which contains rust inhibitors and corrosion inhibitors.

2. The corrosion-resistant deep groove ball bearing as described in claim 1, characterized in that: The first corrosion-resistant layer (6) is a chemically plated nickel-phosphorus alloy coating with a thickness of 5-15 μm.

3. The corrosion-resistant deep groove ball bearing as described in claim 1, characterized in that: The second corrosion-resistant layer (7) is a physical vapor deposition (PVD) titanium nitride coating with a thickness of 1-5 μm.

4. The corrosion-resistant deep groove ball bearing as described in claim 1, characterized in that: The retainer (4) is made of polyetheretherketone (PEEK) or stainless steel.

5. A corrosion-resistant deep groove ball bearing as described in claim 1, characterized in that: The third corrosion-resistant layer (8) is an epoxy resin coating with a thickness of 10-30 μm.

6. The corrosion-resistant deep groove ball bearing as described in claim 1, characterized in that: The labyrinth-type sealing structure includes multiple cooperating annular protrusions (53) and grooves (54), forming a tortuous sealing path between the annular protrusions (53) and grooves (54).

7. A corrosion-resistant deep groove ball bearing as described in claim 1, characterized in that: An elastic sealing ring (55) is also provided between the sealing seat (51) and the sealing cover (52), and the elastic sealing ring (55) is made of fluororubber or silicone rubber.

8. A corrosion-resistant deep groove ball bearing according to claim 1, characterized in that: The corrosion-resistant grease (9) is a composite lithium-based grease or a polyurea-based grease, the rust inhibitor is a petroleum sulfonate, and the corrosion inhibitor is benzotriazole.

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