Insulation structure for bearing assembly

Abstract

The utility model discloses an insulating structure for a bearing assembly, comprising a rotating shaft, on which a bearing inner cover, a bearing body, a bearing outer cover and an oil slinger are sequentially sleeved; an end cover is fixedly sleeved on the outer side of an outer ring of the bearing body, the bearing inner cover and the bearing outer cover are respectively fixedly connected to the end faces on both sides of the end cover, the inner side of the inner ring of the bearing body cooperates with the rotation limit of the rotating shaft, the inner side of the oil slinger is cooperated with the rotation limit of the rotating shaft, and the oil slinger is gap-matched with the bearing outer cover; a side of the oil slinger close to the bearing outer cover is connected with a plurality of conductive brushes distributed in a circle, and the other end of the conductive brush abuts with the bearing outer cover; or a side of the bearing outer cover close to the oil slinger is connected with a plurality of conductive brushes distributed in a circle, and the other end of the conductive brush abuts with the oil slinger; the utility model can effectively guide the shaft current to the ground, avoid the electrical corrosion of the bearing by the shaft current, and thus improve the insulation performance and service life of the bearing.

Description

Technical Field

[0001] The utility model relates to the technical field of bearing assembly, in particular to an insulating structure for bearing assembly. Background Art

[0002] In modern industrial applications, bearings are an important part of mechanical equipment, and their performance and reliability directly affect the stable operation of the entire system. During long-term operation, bearings may suffer performance degradation or even failure due to factors such as friction, wear, contamination and electrical corrosion. Among them, electrical corrosion is a common problem, which is usually caused by the shaft voltage generated when the motor is running, causing the current to flow through the metal part of the bearing, thereby causing damage to the bearing.

[0003] The generation of shaft voltage may come from many reasons, such as electromagnetic interference, electrostatic effects, ground loop problems, etc. When these voltages are transmitted through the bearing, currents will be generated between the metal parts of the bearing, which is called shaft current. The shaft current will flow between the rolling elements and the inner and outer rings of the bearing, causing local overheating, electric sparks and electrical corrosion, which may eventually lead to early failure of the bearing.

[0004] In order to solve this problem, it is necessary to design an insulation structure that can effectively isolate the shaft current and protect the bearing from electrical corrosion. This insulation structure should be able to provide a safe current path without affecting the normal operation of the bearing, guide the shaft current to the ground, and protect the bearing from damage.

[0005] In the existing technology, some solutions have been proposed and applied, such as using insulating materials to manufacture bearing components, adding insulating barriers to bearings, or installing protective devices on the outside of bearings. However, these methods often have certain limitations, such as high cost, complex installation, and difficult maintenance.

[0006] Therefore, developing a new type of bearing assembly insulation structure to provide a more effective, economical and easy-to-maintain solution to improve the insulation performance of the bearing, extend its service life and reduce bearing failures caused by electrical corrosion is of great significance for improving the reliability and safety of mechanical equipment. Summary of the invention

[0007] The purpose of the utility model is to provide an insulating structure for a bearing assembly in view of the problems existing in the prior art. By arranging a conductive brush on an oil slinger or a bearing outer cover, an electrical path is formed, which can effectively guide the shaft current to the ground, avoiding electrical corrosion of the bearing by the shaft current, thereby improving the insulation performance and service life of the bearing.

[0008] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0009] An insulating structure for a bearing assembly comprises a rotating shaft, on which a bearing inner cover, a bearing body, a bearing outer cover and an oil slinger are sequentially sleeved; an end cover is fixedly sleeved on the outer side of the outer ring of the bearing body, the bearing inner cover and the bearing outer cover are respectively fixedly connected to the end faces on both sides of the end cover, the inner side of the inner ring of the bearing body cooperates with the rotation limit of the rotating shaft, the inner side of the oil slinger is cooperated with the rotation limit of the rotating shaft, and the oil slinger is gap-matched with the bearing outer cover; a side of the oil slinger close to the bearing outer cover is connected to a plurality of conductive brushes distributed in a circle, and the other end of the conductive brush abuts against the bearing outer cover; or a side of the bearing outer cover close to the oil slinger is connected to a plurality of conductive brushes distributed in a circle, and the other end of the conductive brush abuts against the oil slinger.

[0010] Furthermore, a radially extending ring edge is fixedly provided on the outer side of the oil slinger ring, and a plurality of conductive brushes are evenly distributed at intervals around the ring edge on the end face of the ring edge close to the bearing outer cover or the end face of the bearing outer cover close to the ring edge.

[0011] Furthermore, a first annular mounting groove is provided on the end surface of the ring edge close to the bearing outer cover or the end surface of the bearing outer cover close to the ring edge, and a plurality of conductive brushes are evenly distributed in the first annular mounting groove at circumferential intervals, and a tensioning block is provided between each two adjacent conductive brushes, and the tensioning block and the conductive brush are interference fit.

[0012] Furthermore, the end surface of the ring edge close to the bearing outer cover or the end surface of the bearing outer cover close to the ring edge is provided with a plurality of first mounting grooves corresponding one to one with the conductive brushes, and the first mounting grooves are interference fit with the conductive brushes.

[0013] Furthermore, an annular slot is provided on one side of the bearing outer cover close to the oil slinger ring, and an axially extending ring platform is provided on one side of the oil slinger ring close to the bearing outer cover, and the ring platform and the annular slot have a plug-in clearance fit; a plurality of conductive brushes are evenly distributed at circumferential intervals on the outer ring wall of the ring platform or the inner ring wall of the annular slot.

[0014] Furthermore, a second annular mounting groove is provided on the outer ring wall of the ring platform or the inner ring wall of the annular slot, and a plurality of conductive brushes are evenly distributed in the second annular mounting groove at circumferential intervals. A tensioning block is provided between each two adjacent conductive brushes, and the tensioning block and the conductive brush are interference fit.

[0015] Furthermore, the outer ring wall of the ring platform or the inner ring wall of the annular slot is provided with a plurality of second installation grooves corresponding one to one with the conductive brushes, and the second installation grooves are interference-fitted with the conductive brushes.

[0016] Furthermore, the conductive brush includes a metal clip and a carbon fiber bundle, the metal clip is provided with a plate cavity, one end of the carbon fiber bundle is arranged in the plate cavity and is interference fit with the plate cavity.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1. By setting a conductive brush on the oil slinger or the outer cover of the bearing, an electrical path is formed, which can effectively guide the shaft current to the ground, avoiding the electrical corrosion of the bearing by the shaft current, thereby improving the insulation performance and service life of the bearing;

[0019] 2. The conductive brushes are evenly distributed along the oil slinger or the outer cover of the bearing, ensuring the uniformity and continuity of current transmission, reducing local overheating and wear, and extending the service life of the conductive brushes;

[0020] 3. Using carbon fiber bundles as part of the conductive brush provides superior physical and chemical properties due to its high strength, high temperature resistance, good friction resistance and thermal conductivity, making the conductive brush more durable and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of a bearing insulation structure in an embodiment of the present application;

[0022] Figure 2 This is a schematic diagram of a bearing insulation structure in an embodiment of the present application;

[0023] Figure 3 This is a schematic diagram of a bearing insulation structure in an embodiment of the present application;

[0024] Figure 4 This is a schematic diagram of the structure of the ring edge end surface in one embodiment of the present application;

[0025] Figure 5 This is a schematic diagram of the structure of the ring edge end surface in one embodiment of the present application;

[0026] Figure 6 This is a schematic diagram of the structure of the outer ring of the ring platform in one embodiment of the present application;

[0027] Figure 7 This is a schematic diagram of the structure of the outer ring of the ring platform in one embodiment of the present application;

[0028] Figure 8 This is a schematic diagram of the structure of a conductive brush in one embodiment of the present application;

[0029] In the figure: 1, rotating shaft; 2, bearing inner cover; 3, bearing body; 4, bearing outer cover; 5, oil slinger; 6, end cover; 7, conductive brush; 8, ring edge; 9, first annular mounting groove; 10, tensioning block; 11, annular slot; 12, ring platform; 13, metal clip; 14, carbon fiber bundle; 15, first mounting groove; 16, second mounting groove; 17, second annular mounting groove. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0032] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] like Figures 1 to 8 As shown, an insulating structure of a bearing assembly comprises a rotating shaft 1, on which a bearing inner cover 2, a bearing body 3, a bearing outer cover 4 and an oil slinger 5 are sequentially sleeved; an end cover 6 is fixedly sleeved on the outer side of the outer ring of the bearing body 3, the bearing inner cover 2 and the bearing outer cover 4 are respectively fixedly connected to the end faces of both sides of the end cover 6, the inner side of the inner ring of the bearing body 3 is matched with the rotation limit of the rotating shaft 1, the inner side of the oil slinger 5 is matched with the rotation limit of the rotating shaft 1, and the oil slinger 5 is matched with the bearing outer cover 4 in clearance; a side of the oil slinger 5 close to the bearing outer cover 4 is connected to a plurality of conductive brushes 7 distributed in a circle, and the other end of the conductive brush 7 is abutted against the bearing outer cover 4.

[0035] Among them, the bearing inner cover, bearing body, bearing outer cover and oil slinger are sequentially sleeved on the rotating shaft to form a complete bearing assembly, the end cover is connected to the machine base to form a support, and the end cover is grounded; the rotation limit matching method is preferably a keyway connection, and the oil slinger and the bearing outer cover are clearance matched to allow the oil slinger to rotate freely in the bearing outer cover, which is conducive to the distribution and heat dissipation of the lubricating oil.

[0036] By connecting multiple conductive brushes distributed in a circle to the oil slinger or the bearing outer cover, the other ends of these conductive brushes abut against the bearing outer cover or the oil slinger, and the oil slinger is in contact with the rotating shaft, thus forming an electrical path. When the motor is running, if shaft voltage is generated, the shaft current can be guided to the ground through the oil slinger, conductive brushes, bearing outer cover and end cover in sequence, thereby avoiding electrical corrosion of the bearing by the shaft current.

[0037] In one embodiment, a plurality of conductive brushes 7 distributed in a circumference are connected to one side of the bearing outer cover 4 close to the oil slinger 5 , and the other end of the conductive brush 7 is in abutment with the oil slinger 5 .

[0038] In one embodiment, Figure 1 As shown, a radially extending ring edge 8 is fixedly provided on the outer side of the oil slinger 5, and a plurality of the conductive brushes 7 are evenly distributed at intervals around the circumference on the end surface of the ring edge 8 close to the bearing outer cover 4 or the end surface of the bearing outer cover 4 close to the ring edge 8. By providing the ring edge 8 on the oil slinger 5 and distributing the conductive brushes 7 thereon, it can be ensured that the conductive brushes 7 can continuously maintain contact with the bearing outer cover 4 during the rotation process, thereby achieving stable current transmission.

[0039] In one embodiment, Figure 4 As shown, the end surface of the ring edge 8 close to the bearing outer cover 4 is provided with a first annular installation groove 9, and a plurality of the conductive brushes 7 are evenly distributed in the first annular installation groove 9 at circumferential intervals, and a tensioning block 10 is provided between each two adjacent conductive brushes 7, and the tensioning block 10 and the conductive brush 7 are interference-fitted. Such a design is to ensure that the conductive brush 7 can effectively cooperate with the ring edge 8 and the bearing outer cover 4.

[0040] Among them, a plurality of conductive brushes 7 are evenly spaced and distributed in the first annular mounting groove 9. The evenly distributed conductive brushes 7 help to achieve more uniform current transmission and better electrical contact. This layout also helps to reduce local overheating and wear and prolong its service life. The function of the tensioning block 10 is to provide additional support and fixation for the conductive brushes 7 to ensure that they maintain a stable contact pressure during operation.

[0041] In one embodiment, a first annular mounting groove 9 is provided on the end surface of the bearing outer cover 4 close to the annular edge 8 .

[0042] In one embodiment, Figure 5 As shown, the end surface of the ring edge 8 close to the bearing outer cover 4 is provided with a plurality of first mounting grooves 15 corresponding to the conductive brushes 7 one by one, and the first mounting grooves 15 are interference fit with the conductive brushes 7. This design allows each conductive brush 7 to have a dedicated mounting position, ensuring the stability and reliability of the conductive brush 7 in the structure; since each conductive brush 7 has a corresponding mounting groove, it is easier to place the conductive brushes 7 in the correct position during assembly, and ensure that they are correctly matched with the ring edge 8 and the bearing outer cover 4, which not only improves the assembly efficiency, but also helps to reduce possible errors during the assembly process, thereby improving the quality of the entire bearing assembly.

[0043] In one embodiment, the end surface of the bearing outer cover 4 close to the annular edge 8 is provided with a plurality of first mounting grooves 15 corresponding one-to-one to the conductive brushes 7 .

[0044] In one embodiment, Figure 2 As shown, the side of the bearing outer cover 4 close to the oil slinger 5 is provided with an annular slot 11, and the side of the oil slinger 5 close to the bearing outer cover 4 is provided with an axially extending ring platform 12, and the ring platform 12 is plugged into the annular slot 11 with a clearance fit; a plurality of the conductive brushes 7 are evenly distributed at intervals on the outer ring wall of the ring platform 12 or the inner ring wall of the annular slot 11. The ring platform 12 can be plugged into the annular slot 11 and form a clearance fit. Such a fit not only ensures the stability of the structure, but also allows certain adjustments and flexibility to adapt to different working conditions and requirements; in order to achieve uniform current distribution and good electrical contact, a plurality of conductive brushes 7 are designed to be evenly distributed at intervals along the outer ring wall of the ring platform 12 or the inner ring wall of the annular slot 11. Such a distribution method helps to ensure the uniformity and continuity of the current when it is transmitted between the conductive brush 7 and the ring platform 12, and also helps to reduce local overheating and wear, thereby extending the service life of the conductive brush 7.

[0045] It should be noted that if Figure 3 As described above, based on the description of this embodiment, those skilled in the art can easily conceive that the positions of the ring platform and the annular slot can be swapped, such as providing a ring platform on the bearing outer cover and providing an annular slot on the oil thrower ring. This simple deformation should be considered to be within the scope of protection of this application.

[0046] In one embodiment, Figure 6As shown, the outer ring wall of the ring stage 12 is provided with a second annular mounting groove 17, and a plurality of the conductive brushes 7 are evenly spaced in the circumference of the second annular mounting groove 17, and a tensioning block 10 is provided between each two adjacent conductive brushes 7, and the tensioning block 10 and the conductive brush 7 are interference fit. Such a layout allows the conductive brushes 7 to be evenly spaced along the circumferential direction of the ring stage, ensuring the uniformity and reliability of electrical contact; through the use of the tensioning block 10, not only can the fixing effect of the conductive brush 7 be improved, but also the dimensional changes caused by thermal expansion or other factors can be absorbed to a certain extent, thereby reducing the impact of these changes on the stability of electrical contact. In addition, the tensioning block 10 can also serve as a buffer element, which helps to reduce the wear that may occur to the conductive brush 7 during the contact process.

[0047] In one embodiment, the inner wall of the annular slot 11 is provided with a second annular mounting groove 17 .

[0048] In one embodiment, Figure 7 As shown, the outer ring wall of the ring stage 12 is provided with a plurality of second mounting grooves 16 corresponding to the conductive brushes 7 one by one, and the second mounting grooves 16 are plug-fitted with the conductive brushes 7 in an interference fit. A stable and precise mounting position is provided for the conductive brushes 7, ensuring that they can maintain a proper position and angle in the bearing assembly; in addition, since each conductive brush 7 has a corresponding mounting groove, it is easier to place the conductive brushes in the correct position when assembling the bearing, and ensure that they are properly matched with the ring stage 12 or the annular slot 11. This design not only improves the assembly efficiency, but also helps to reduce possible errors in the assembly process, thereby improving the quality of the entire bearing assembly.

[0049] In one embodiment, the inner wall of the annular slot 11 is provided with a plurality of second mounting grooves 16 corresponding one-to-one to the conductive brushes 7 .

[0050] In one embodiment, Figure 8 As shown, the conductive brush 7 includes a metal clip 13 and a carbon fiber bundle 14. The metal clip 13 is provided with a plate cavity. One end of the carbon fiber bundle 14 is arranged in the plate cavity and is interference fit with the plate cavity. The metal clip 13 is used to provide a fixed bracket for the carbon fiber bundle 14. It has a plate cavity. The design of the plate cavity takes into account the size and shape of the carbon fiber bundle to ensure that the carbon fiber bundle can be tightly installed therein. The material and structural design of the metal clip 13 help to improve the overall strength and durability of the conductive brush, and can also withstand the mechanical stress that may occur during operation.

[0051] The carbon fiber bundle 14 is formed by the aggregation of carbon fiber filaments. The application of carbon fiber materials in this application has the following advantages:

[0052] 1. Carbon fiber is a high-strength and high-modulus fiber with a carbon content of more than 90%. The diameter of the carbon fiber is 5 microns and the strength is more than 4 times that of aluminum alloy. It has high strength and is not easy to be damaged, which meets the requirements of continuous operation of the motor.

[0053] 2. Carbon fiber has the best high temperature resistance among all chemical fibers. It is made of acrylic and viscose fibers through high-temperature oxidation and carbonization. It is an excellent material for manufacturing high-tech aerospace equipment. High temperature resistance enables the carbon fiber conductive brush to maintain the strength and toughness of the material within the operating temperature range of the motor bearing and maintain a good contact area, thereby making the conductive effect reliable.

[0054] 3. Good anti-friction makes it generate less heat when in contact with rotating parts, making it more durable and firm.

[0055] 4. Carbon fiber has good thermal conductivity, which enables it to dissipate heat faster when in contact with the rotating parts of the bearing, and prevents heat from accumulating in the bearing assembly, ensuring stable operation of the bearing.

[0056] 5. The corrosion resistance of carbon fiber makes the carbon fiber conductive brush have good chemical stability when it comes into contact with bearing grease, and will not cause pollution or be contaminated.

[0057] 6. Its graphite microcrystalline structure is preferentially oriented along the fiber axis, has high strength and modulus, low density, high specific strength and specific modulus, making the carbon fiber conductive brush lighter, softer, more wear-resistant and longer in service life.

[0058] 7. In the crystal structure of carbon fiber, carbon atoms are arranged closely and regularly to form long chains, so they have high strength and good conductivity. The surface of carbon fiber is often subjected to a series of physical and chemical treatments to increase the surface roughness and the content of active functional groups, thereby improving its conductivity.

[0059] 8. The carbon fiber used in the carbon fiber conductive brush has a good composite function with metal, which makes the carbon fiber and copper have good composite properties, perfectly combining the advantages of high strength, friction resistance, good toughness and good thermal conductivity of carbon fiber with the good electrical conductivity of copper tube.

[0060] 9. Carbon fiber conductive brushes have high strength, good flexibility, flexible layout, and are easy to use and maintain.

[0061] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An insulation structure for a bearing assembly, characterized in that: The invention comprises a rotating shaft (1), on which a bearing inner cover (2), a bearing body (3), a bearing outer cover (4) and an oil slinger (5) are sequentially sleeved; an end cover (6) is fixedly sleeved on the outer side of the outer ring of the bearing body (3); the bearing inner cover (2) and the bearing outer cover (4) are respectively fixedly connected to the end surfaces on both sides of the end cover (6); the inner side of the inner ring of the bearing body (3) is rotationally limitedly matched with the rotating shaft (1); the inner side of the oil slinger (5) is rotationally limitedly matched with the rotating shaft (1); and the oil slinger (5) is clearance-matched with the bearing outer cover (4); A plurality of conductive brushes (7) distributed in a circumferential manner are connected to one side of the oil slinger (5) close to the bearing outer cover (4), and the other end of the conductive brush (7) abuts against the bearing outer cover (4); or, a plurality of conductive brushes (7) distributed in a circumferential manner are connected to one side of the bearing outer cover (4) close to the oil slinger (5), and the other end of the conductive brush (7) abuts against the oil slinger (5).

2. The insulating structure of a bearing assembly according to claim 1, characterized in that: A radially extending ring edge (8) is fixedly provided on the outer side of the oil slinger ring (5), and a plurality of the conductive brushes (7) are evenly distributed at intervals around the circumference on the end surface of the ring edge (8) close to the bearing outer cover (4) or the end surface of the bearing outer cover (4) close to the ring edge (8).

3. The insulating structure of a bearing assembly according to claim 2, characterized in that: A first annular mounting groove (9) is provided on the end surface of the annular edge (8) close to the bearing outer cover (4) or on the end surface of the bearing outer cover (4) close to the annular edge (8). A plurality of the conductive brushes (7) are evenly distributed in the first annular mounting groove (9) at circumferential intervals. A tensioning block (10) is provided between each two adjacent conductive brushes (7). The tensioning block (10) and the conductive brush (7) are in interference fit.

4. The insulating structure of a bearing assembly according to claim 2, characterized in that: The end surface of the ring edge (8) close to the bearing outer cover (4) or the end surface of the bearing outer cover (4) close to the ring edge (8) is provided with a plurality of first mounting grooves (15) corresponding one to one with the conductive brushes (7), and the first mounting grooves (15) are interference fit with the conductive brushes (7).

5. The insulating structure of a bearing assembly according to claim 1, characterized in that: An annular slot (11) is provided on one side of the bearing outer cover (4) close to the oil slinger (5); an axially extending annular platform (12) is provided on one side of the oil slinger (5) close to the bearing outer cover (4); the annular platform (12) and the annular slot (11) are plug-in-gap matched; a plurality of the conductive brushes (7) are evenly spaced circumferentially distributed on the outer ring wall of the annular platform (12) or the inner ring wall of the annular slot (11).

6. The insulating structure of a bearing assembly according to claim 5, characterized in that: The outer ring wall of the annular platform (12) or the inner ring wall of the annular slot (11) is provided with a second annular mounting groove (17), a plurality of the conductive brushes (7) are evenly distributed in the circumference of the second annular mounting groove (17), a tensioning block (10) is provided between each two adjacent conductive brushes (7), and the tensioning block (10) and the conductive brush (7) are in interference fit.

7. The insulating structure of a bearing assembly according to claim 5, characterized in that: The outer ring wall of the annular platform (12) or the inner ring wall of the annular slot (11) is provided with a plurality of second installation grooves (16) corresponding one to one with the conductive brushes (7), and the second installation grooves (16) are interference-fitted with the conductive brushes (7).

8. The insulating structure of a bearing assembly according to claim 1, characterized in that: The conductive brush (7) comprises a metal clip (13) and a carbon fiber bundle (14); the metal clip (13) is provided with a plate cavity; one end of the carbon fiber bundle (14) is arranged in the plate cavity and is interference-fitted with the plate cavity.

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