Rolling bearing arrangement and method for producing rolling bearing arrangement

Abstract

The invention starts from a rolling bearing arrangement having at least one first ring (10) and at least one first part (12), which can be rotated relative to the at least one first ring, and having rolling elements (14), which are designed to roll on a raceway (16) of the first ring and on a raceway (18) of the first part, the invention relates to a rolling bearing arrangement comprising a rolling element, and the arrangement has a first seal (20) and at least one second seal (22), which together seal a space (24) of the rolling bearing arrangement in which the rolling element is located, the first seal being located at a first end (26) of the space and the second seal being located at a second end (28) of the space, the second end being arranged opposite the first end of the space. According to the invention, the surface region (30) of the rolling bearing arrangement is at least partially made of potassium and / or calcium and / or sodium and / or magnesium and / or aluminum and / or zinc and / or cadmium and / or iron and / or nickel and / or tin and / or lead and / or copper and / or at least one zeolite and / or zinc phosphate, the surface region is a boundary region of the space and is designed to be always at a distance from all the rolling elements.

Description

Technical Field

[0001] This invention relates to a rolling bearing assembly and a method for manufacturing the rolling bearing assembly. Background Technology

[0002] Document JP 2003287037 A describes a rolling bearing sealed by two seals. An oxygen absorber is fixed to the inner surface of the rolling element side of the seal. The oxygen absorber may contain organic matter.

[0003] Document US 8,313243 B2 discloses a rolling bearing. In at least one of the components constituting the internal space of the rolling bearing, an additive for the grease is fixed to the surface of at least one of the components, the surface being disposed on one side of the internal space of the rolling bearing, rather than on a sliding surface of the at least one of the components over which the rolling element slides. The grease additive is fixed to the surface of the seal located on one side of the bearing's internal space. The grease additive includes agents whose components melt in the grease (additive) to directly assist the grease, and agents that generate gases, etc., and reduce the oxygen concentration in the space within the bearing, thereby preventing oxidative deterioration of the grease and indirectly assisting the grease.

[0004] In addition, V. Bagotsky, Fundamentals of Electrochemistry, 2nd ed., New Jersey: John Wiley & Sons, Inc., 2006, teaches the tendency of materials to be oxidized.

[0005] In addition, A. Khan and ME Kordesch, "Large-scale fabrication of metallic Zn nanowires by thermal evaporation," Physica E: Low-dimensional Systems and Nanostructures, vol. 33, no. 1, pp. 88-91, 2006, specifically describes the production of nanowires.

[0006] In addition, E. Pérez-Botella, S. Valencia and F. Rey, "Zeolites in Adsorption Processes: State of the Art and Future Prospects," Chemical Reviews, vol. 122, no. 24, pp. 17647-17695, 2022, describes the prior art regarding zeolites.

[0007] In addition, J J. Sebastian and RV Jasra, "Sorption of Nitrogen, Oxygen, and Argon in Silver-Exchanged Zeolites," Industrial Engineering Chemicalresearch, vol. 44, pp. 8014-8024, 2005, reported on the adsorption of oxygen by zeolites.

[0008] In addition, Calabrese, "Anticorrosion Behavior of Zeolite Coatings Obtainedby In Situ Crystallization: A Critical Review," Materials (Basel), vol. 12, no. 1, p. 59, 2018, informs about zeolite coatings.

[0009] Using inert grease can improve the prevention of grease oxidation. However, this type of grease is non-biodegradable and therefore harmful to the environment and health. Summary of the Invention

[0010] The problem addressed by this invention is particularly the need to extend the life of the lubricant in rolling bearing assemblies. According to the invention, this problem is solved by the features of claim 1 and claim 10, while advantageous embodiments and further embodiments of the invention can be derived from the dependent claims.

[0011] The present invention relates to a rolling bearing assembly having at least one first race and at least one first component, the first component being rotatable relative to the at least one first race, and the rolling bearing assembly having a rolling element designed to roll on the raceways of the first race and the first component, and having a first seal and at least one second seal that together seal a space in which the rolling element is located, wherein the first seal is located at a first end of the space and the second seal is located at a second end of the space, the second end being arranged opposite to the first end of the space.

[0012] This invention proposes that the surface area of ​​a rolling bearing assembly is at least partially made of potassium and / or calcium and / or sodium and / or magnesium and / or aluminum and / or zinc and / or cadmium and / or iron and / or nickel and / or tin and / or lead and / or copper and / or at least one zeolite and / or zinc phosphate, this surface area being a spatial boundary region and designed to always maintain a certain distance from all rolling elements. This extends the life of the bearing lubricant. In particular, oxidation of at least a portion of the surface area can be achieved before the bearing grease is oxidized.

[0013] Advantageously, the surface area is the surface area of ​​the coating of the rolling bearing device. Therefore, the surface area can be manufactured easily and efficiently.

[0014] Furthermore, it is recommended that the coating thickness be from 50 μm to 800 μm, preferably from 250 μm to 650 μm, and more preferably from 350 μm to 570 μm. Therefore, the coating can deoxidize most of the oxygen generated in the space, while preventing the coating from cracking or peeling off from the substrate due to internal stress.

[0015] Advantageously, the coating comprises nanofilaments comprising potassium and / or calcium and / or sodium and / or magnesium and / or aluminum and / or zinc and / or cadmium and / or iron and / or nickel and / or tin and / or lead and / or copper and / or at least one zeolite and / or zinc phosphate. This allows for a large ratio between the contact area (on which contact between the coating and oxygen can occur) and the volume of the coating.

[0016] Furthermore, this invention proposes that the surface area be part of the cage of the rolling bearing assembly or part of the shoulder of the rolling bearing ring of the rolling bearing assembly. Therefore, efficient use of the surface of the rolling bearing assembly is achieved.

[0017] Furthermore, it is proposed that the first and second seals airtightly seal the space. This prevents oxygen from outside the space from entering and oxidizing the lubricant of the rolling bearing assembly.

[0018] Advantageously, the surface region comprises at least one Linde A-type zeolite. This allows at least a portion of the surface region to adsorb oxygen and be regenerated, enabling it to be used multiple times as an oxygen adsorbent.

[0019] Advantageously, the surface region comprises at least one Linde A-type zeolite, which has been modified by at least one chemical treatment. In this way, at least a portion of the surface region can adsorb a relatively large amount of oxygen and can be regenerated, allowing it to be used as an oxygen adsorbent multiple times.

[0020] Furthermore, it is proposed that all surface areas of the rolling bearing assembly are made of potassium and / or calcium and / or sodium and / or magnesium and / or aluminum and / or zinc and / or cadmium and / or iron and / or nickel and / or tin and / or lead and / or copper and / or at least one zeolite and / or zinc phosphate, said surface areas being the boundary areas of space and designed to always maintain a certain distance from all rolling elements. In this way, a large deoxidation capacity can be achieved.

[0021] Advantageously, the rolling bearing assembly includes grease as a lubricant, wherein the grease contains at least one antioxidant additive. This allows for a long service life of the lubricant.

[0022] Furthermore, a method for manufacturing a rolling bearing assembly, particularly the rolling bearing assembly as described above, is proposed, wherein the rolling bearing assembly includes at least one first race and at least one first component rotatable relative to the at least one first race, and rolling elements designed to roll on the raceways of the first race and the raceways of the first component, and a first seal and at least one second seal, which together seal a space of the rolling bearing assembly in which the rolling elements are located, wherein the first seal is located at a first end of the space and the second seal is located at a second end of the space, the second end being arranged opposite to the first end of the space, wherein a surface region of the rolling bearing assembly, which is the boundary region of the space, is designed to always maintain a certain distance from all rolling elements, and is at least partially made of potassium and / or calcium and / or sodium and / or magnesium and / or aluminum and / or zinc and / or cadmium and / or iron and / or nickel and / or tin and / or lead and / or copper and / or at least one zeolite and / or zinc phosphate, formed by chemical solution deposition and / or electrodeposition and / or spray deposition and / or physical vapor deposition. This can extend the life of the lubricant in rolling bearing assemblies. Attached Figure Description

[0023] Further advantages will become apparent in the following description of the accompanying drawings. Examples of embodiments of the invention are illustrated in the drawings. The drawings, description, and claims contain numerous combined features. Those skilled in the art will also readily consider the features individually and combine them to form further useful combinations.

[0024] Figure 1 A schematic axial half-sectional view of a rolling bearing device according to the present invention is shown. Detailed Implementation

[0025] Figure 1 An axial half-sectional view of a rolling bearing assembly comprising ball bearings is shown. The rolling bearing assembly includes a first raceway 10, a first component 12, and a rolling element 14 designed to roll on raceways 16 of the first raceway and 18 of the first component. The first raceway is the outer ring of the ball bearing, and the first component is the inner ring of the ball bearing. Furthermore, the rolling bearing assembly includes a first seal 20 and at least one second seal 22. The first and second seals hermetically seal a space 24 of the rolling bearing assembly in which the rolling element is located. The seals may be made of polymer, rubber, and / or metal. In particular, the seals may be made of a non-conductive polymer. The first seal is located at a first end 26 of the space, and the second seal is located at a second end 28 of the space, the second end 28 being axially opposite to the first end of the space. All surface areas of the rolling bearing assembly are boundary areas of space and are designed to always maintain a certain distance from all rolling elements. They are made of potassium and / or calcium and / or sodium and / or magnesium and / or aluminum and / or zinc and / or cadmium and / or iron and / or nickel and / or tin and / or lead and / or copper and / or at least one zeolite and / or zinc phosphate. The first surface area among these is surface area 30, which is the surface of the shoulder 36 of the outer ring. Other surface areas include the surface portions of the shoulder 38 of the outer ring, the surface portions of the shoulder of the inner ring, the surface portions of the seals 20, 22, and a portion of the surface of the cage 34 of the rolling bearing assembly. The surface of the seal that contacts the inner ring is not coated to achieve a good sealing function. Alternatively, only a very thin gap is left between the surface of the seal and the inner ring.

[0026] All surface areas are the surface areas of coating 32 of the rolling bearing device. The coating thickness is a few nanometers or 50 μm to 800 μm, preferably 250 μm to 650 μm, more preferably 350 μm to 570 μm. The thicker the coating, the more oxygen can be deoxidized. The coating may, but must, include or consist of nanowires, said nanowires comprising or consisting of potassium and / or calcium and / or sodium and / or magnesium and / or aluminum and / or zinc and / or cadmium and / or iron and / or nickel and / or tin and / or lead and / or copper and / or at least one zeolite and / or zinc phosphate. The nanowires may have nanometer-scale diameters. Furthermore, the coating may be grown in the form of these nanowires. In addition, all surface areas may contain or consist of at least one Linde Type A zeolite or at least one Linde Type A zeolite modified by at least one chemical treatment. Chemical treatment can change the Si / Al ratio of the zeolite, which significantly alters oxygen adsorption.

[0027] The rolling bearing assembly contains grease (not shown) as a lubricant, wherein the grease contains at least one antioxidant additive. The grease lubricates the movement of the rolling elements relative to the outer and inner rings.

[0028] The coating is produced by chemical solution deposition and / or electrodeposition and / or spray deposition and / or physical vapor deposition. By changing the deposition parameters (e.g., increasing the coating growth rate), the coating roughness can be increased, and thus the surface area available for oxidation can be increased.

[0029] Rolling bearing assemblies can be used in high-temperature ranges, such as up to 300°C, because the grease in the bearing assembly does not oxidize rapidly.

[0030] The lifespan of grease can be further extended by adding more antioxidants to it.

[0031] Lubricant oxidation does not occur before the induction time (the time it takes for the antioxidant additives dissolved in the lubricant to be consumed). During this period, the coating oxidizes, consuming oxygen from the air filling the bearing. This leads to a decrease in oxygen concentration, thus reducing the reaction rate of the oxidation process after the antioxidant is consumed, and therefore increasing the lubricant's lifespan. The oxidation rate of the coating also decreases as the oxygen in the air decreases. This means the coating does not need to be very thick. The coating thickness depends on the quality of the seal, i.e., its ability to prevent fresh air from entering the bearing.

[0032] Oxidation of bearing functional surfaces occurs particularly in mixed lubrication conditions, where the (soft) oxide layer wears away, constantly creating new surfaces exposed to oxygen, thus leading to further oxidation. This process, known as corrosive minor wear, produces iron-containing particles that act as catalysts for lubricant oxidation. In addition to directly preventing lubricant oxidation as described above, the coating also prevents accelerated oxidation caused by catalytic metal particles on the functional surfaces, thus further reducing the reaction rate of the lubricant oxidation process.

[0033] Currently, some seals are coated with low-friction coatings (such as DLC or Teflon). Therefore, there is prior art knowledge about how to apply them.

[0034] The further embodiments of the present invention differ from the first embodiment of the present invention described so far only in that the seal is not coated. The further embodiments of the present invention differ from the first embodiment of the present invention only in that the first component of the first collar is not coated.

[0035] Furthermore, in all embodiments, it is possible to leave the cage uncoated.

[0036] List of reference numerals in the attached diagram:

[0037] 10 rings

[0038] 12 parts

[0039] 14 rolling elements

[0040] 16-rollway

[0041] 18-track

[0042] 20 seals

[0043] 22 Seals

[0044] 24 Space

[0045] 26 ends

[0046] 28 ends

[0047] 30 surface areas

[0048] 32 coatings

[0049] 34 cages

[0050] 36 Shoulder

[0051] 38 Shoulder

Claims

1. Rolling bearing arrangement having at least one first ring (10) and at least one first part (12) rotatable relative to the at least one first ring, and having rolling elements (14) designed to roll on raceways (16) of the first ring and on raceways (18) of the first part, and having a first seal (20) and at least one second seal (22) which together seal a space (24) of the rolling bearing arrangement in which the rolling elements are located, wherein The first seal is located at a first end (26) of the space and the second seal is located at a second end (28) of the space, the second end being arranged opposite the first end of the space, characterized in that The surface area (30) of the rolling bearing arrangement is at least partially made of potassium and / or calcium and / or sodium and / or magnesium and / or aluminum and / or zinc and / or cadmium and / or iron and / or nickel and / or tin and / or lead and / or copper and / or at least one zeolite and / or zinc phosphate, the surface area being a boundary area of the space and being designed to always be at a distance from all rolling elements.

2. Rolling bearing arrangement according to claim 1, characterized in that The surface area (30) is a surface area of a coating (32) of the rolling bearing arrangement.

3. Rolling bearing arrangement according to claim 2, characterized in that The coating (32) has a thickness of 50 μιη to 800 μιη.

4. Rolling bearing arrangement according to at least one of claims 2 or 3, characterized in that The coating (32) comprises nanowires comprising potassium and / or calcium and / or sodium and / or magnesium and / or aluminum and / or zinc and / or cadmium and / or iron and / or nickel and / or tin and / or lead and / or copper and / or at least one zeolite and / or zinc phosphate.

5. Rolling bearing arrangement according to at least one of the preceding claims, characterized in that The surface area is a part of a cage (34) of the rolling bearing arrangement or a part of a shoulder (36) of a rolling bearing ring of the rolling bearing arrangement.

6. Rolling bearing arrangement according to at least one of the preceding claims, characterized in that The first seal (20) and the second seal (22) seal the space (24) in an air-tight manner.

7. Rolling bearing arrangement according to at least one of the preceding claims, characterized in that The surface area (30) comprises at least one Linde Type A zeolite or at least one Linde Type A zeolite which has been modified by at least one chemical treatment.

8. Rolling bearing arrangement according to at least one of the preceding claims, characterized in that All surface areas of the rolling bearing arrangement are made of potassium and / or calcium and / or sodium and / or magnesium and / or aluminum and / or zinc and / or cadmium and / or iron and / or nickel and / or tin and / or lead and / or copper and / or at least one zeolite and / or zinc phosphate, the all surface areas being boundary areas of the space and being designed to always be at a distance from all rolling elements.

9. Rolling bearing arrangement according to at least one of the preceding claims, characterized in that The rolling bearing arrangement comprises a grease as lubricant, wherein the grease comprises at least one antioxidant additive.

10. Method for manufacturing a rolling bearing arrangement, in particular according to at least one of the preceding claims, wherein, The rolling bearing arrangement comprises at least one first ring (10), at least one first part (12) which is rotatable relative to the at least one first ring (10), rolling elements (14) which are designed to roll on raceways (16) of the first ring and on raceways (18) of the first part, and a first seal (20) and at least one second seal (22) which together seal a space (24) of the rolling bearing arrangement in which the rolling elements are located, wherein the first seal is located at a first end (26) of the space and the second seal is located at a second end (28) of the space which is arranged opposite the first end of the space, characterized in that a surface area (30) of the rolling bearing arrangement which is a boundary area of the space and which is designed to be at a distance from all rolling elements at all times is made at least partially from potassium and / or calcium and / or sodium and / or magnesium and / or aluminium and / or zinc and / or cadmium and / or iron and / or nickel and / or tin and / or lead and / or copper and / or at least one zeolite and / or zinc phosphate.

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