High efficiency low torque hub unit magnetic seal assembly

Abstract

The utility model discloses an efficient low-torque hub unit magnetic sealing assembly, which relates to the technical field of auto spare parts, and comprises a hub outer ring and a hub inner ring, the lower end of the hub inner ring is provided with a mounting flange ring, the hub outer ring is sleeved outside the hub inner ring, the inner side of the hub outer ring is fixedly provided with an inner ring, and the inner ring is fixedly provided with an outer ring. Supporting arc plates are arranged on the upper side and the lower side of the inner ring, a plurality of balls are installed between the two supporting arc plates and the inner ring, a permanent magnet ring is installed at the upper end of the upper supporting arc plate, a magnetic conduction shell is arranged at the upper end of the permanent magnet ring, and magnetic fluid is injected between the magnetic conduction shell and the permanent magnet ring. An annular groove is formed in the outer wall of the magnetic conductive shell. By arranging a series of structures, by means of the threaded column arranged at the lower end of the magnetic conductive shell and the threaded column of a spiral structure, the concentration ratio of a magnetic field is enhanced, the attraction force to magnetic fluid is increased, and the phenomenon of magnetic leakage is reduced.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, specifically to a high-efficiency, low-torque magnetic sealing assembly for a wheel hub unit. Background Technology

[0002] The wheel hub unit is a key component of the automotive suspension system. It is mainly used to support the wheel and allow it to rotate smoothly, while bearing the axial and radial loads during wheel operation. The low-torque wheel hub unit is a wheel hub bearing unit designed for specific scenarios. Its core feature is that it requires a low preload torque during installation, while also taking into account lightweight and long service life.

[0003] Magnetic sealing components are used to reduce internal friction in bearings, allowing for lower initial preload, and are well-suited to the low-load requirements of new energy vehicle motors. Existing magnetic sealing components use a combination of permanent magnet rings, magnetic fluid, and a magnetically conductive shell to enhance sealing and reduce internal friction in bearings. However, after long-term high-speed rotation, the magnetic fluid may gradually leak out, especially when the sealing shell has tiny cracks. Utility Model Content

[0004] The purpose of this invention is to provide a high-efficiency, low-torque magnetic sealing assembly for wheel hub units to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-efficiency, low-torque magnetic sealing assembly for a hub unit, comprising a hub outer ring and a hub inner ring. A mounting flange ring is installed at the lower end of the hub inner ring. The hub outer ring is sleeved and installed outside the hub inner ring. An inner ring is fixedly installed on the inner side of the hub outer ring. Supporting arc plates are provided on both the upper and lower sides of the inner ring. Multiple ball bearings are installed between the two supporting arc plates and the inner ring. A permanent magnet ring is installed at the upper end of the upper supporting arc plate. A magnetically conductive shell is provided at the upper end of the permanent magnet ring. Magnetic fluid is injected between the magnetically conductive shell and the permanent magnet ring. An annular groove is formed on the outer wall of the magnetically conductive shell, and an outer sealing gasket is installed inside the annular groove.

[0006] Preferably, an oil groove is provided between the inner ring and the inner ring of the hub.

[0007] Preferably, an inner sealing gasket is installed at the lower end of the supporting arc plate described below.

[0008] Preferably, the magnetic housing is threadedly connected to the outer ring of the wheel hub via a locking bolt.

[0009] Preferably, a threaded post is installed at the lower end of the magnetic housing, the threaded post is in contact with the magnetic fluid but not with the permanent magnet housing, and an elastic magnetic ring is installed on the outside of the threaded post.

[0010] Preferably, a plurality of connectors are equidistantly installed on the outer side of the outer ring of the hub.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] This high-efficiency, low-torque hub unit magnetic sealing assembly connects to external accessories via bolts through a mounting flange ring. A relatively sealed cavity is formed between the permanent magnet ring and the magnetic housing. Magnetic fluid, a mixture of nano-sized magnetic particles and base grease, is injected into the cavity. Under the influence of a magnetic field, it forms a liquid sealing film. The permanent magnet ring generates a magnetic field, which is guided by the magnetic housing to enhance the sealing effect. This prevents external contaminants from entering the bearing while also preventing lubricant leakage. An external sealing gasket further enhances the sealing performance. Compared to traditional sealing rings, the combination of magnetic fluid and the external sealing gasket improves the overall sealing effect. A threaded post at the lower end of the magnetic housing, with its helical structure, enhances the magnetic field concentration, increases the attraction to the magnetic fluid, and reduces magnetic leakage. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a schematic cross-sectional view of the overall structure of this utility model;

[0015] Figure 3 For the present utility model Figure 2 A magnified view of A in the middle.

[0016] In the diagram: 1. Outer ring of the hub; 2. Magnetic housing; 3. Inner ring of the hub; 4. Mounting flange ring; 5. Connector; 6. Inner ring; 7. Oil groove; 8. Ball bearing; 9. Inner sealing gasket; 10. Support arc plate; 11. Permanent magnet ring; 12. Outer sealing gasket; 13. Threaded post; 14. Locking bolt; 15. Elastic magnetic ring. Detailed Implementation

[0017] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] like Figures 1 to 3 As shown, the high-efficiency, low-torque magnetic sealing assembly for the hub unit in this embodiment includes an outer hub ring 1 and an inner hub ring 3. The inner hub ring 3 and outer hub ring 1 are existing structures. A mounting flange ring 4 is installed at the lower end of the inner hub ring 3, and the mounting flange ring 4 is connected to the external structure by bolts. The outer hub ring 1 is fitted onto the outside of the inner hub ring 3, providing external support. An inner ring 6 is fixedly installed on the inner side of the outer hub ring 1. The upper and lower sides of the inner ring 6 are both curved surfaces. Supporting arc plates 10 are provided on both the upper and lower sides of the inner ring 6. Multiple balls 8 are installed between the two supporting arc plates 10 and the inner ring 6. The two sides of the balls 8 are respectively connected to... The inner ring has six supporting arc plates 10 with their arc surfaces in contact. Lubricating oil is injected between two supporting arc plates 10. A permanent magnet ring 11 is installed at the upper end of the upper supporting arc plate 10. A magnetic conductive shell 2 is provided at the upper end of the permanent magnet ring 11. The permanent magnet ring 11 and the magnetic conductive shell 2 form a sealed cavity. Magnetic fluid is injected between the magnetic conductive shell 2 and the permanent magnet ring 11. The magnetic fluid is injected into the cavity and forms a liquid sealing film under the action of the magnetic field. An annular groove is opened on the outer wall of the magnetic conductive shell 2. An outer sealing gasket 12 is installed inside the annular groove. The outer sealing gasket 12 contacts the outer ring 1 of the hub and the magnetic conductive shell 2 respectively to enhance the sealing performance.

[0020] Specifically, an oil groove 7 is provided between the inner ring 6 and the inner ring 3 of the hub. The lubricating oil can flow through the oil groove 7, which enhances the fluidity of the lubricating oil and reduces the chance of leakage caused by continuous compression.

[0021] Furthermore, an inner sealing gasket 9 is installed at the lower end of the lower support arc plate 10, which is used to enhance the sealing performance.

[0022] Furthermore, the magnetic housing 2 is threadedly connected to the outer ring 1 of the hub via locking bolts 14, and the magnetic housing 2 is connected to the outer ring 1 of the hub via multiple locking bolts 14.

[0023] Furthermore, a threaded post 13 is installed at the lower end of the magnetic housing 2. The threaded post 13 is in contact with the magnetic fluid but not with the permanent magnet housing. An elastic magnetic ring 15 is installed outside the threaded post 13. With the help of the threaded post 13 at the lower end of the magnetic housing 2, the magnetic field concentration is enhanced by the spiral structure of the threaded post 13, which increases the attraction to the magnetic fluid and reduces magnetic leakage. The elastic magnetic ring 15 is made of soft magnetic alloy. At high temperatures, the expansion of the bearing assembly causes the gap between the permanent magnet ring 11 and the magnetic housing 2 to change. The elastic magnetic ring 15 can buffer the impact to prevent leakage of the magnetic fluid. It should be noted that the threaded post 13 and the permanent magnet housing do not come into contact and there is a certain gap between them.

[0024] Furthermore, multiple connectors 5 are equidistantly installed on the outer side of the outer ring 1 of the hub, and each connector 5 has a threaded hole for connection with an external device.

[0025] The method of use in this embodiment is as follows: The flange ring 4 is connected to the external accessories by bolts. A relatively sealed cavity is formed between the permanent magnet ring 11 and the magnetic housing 2. Magnetic fluid is injected into the cavity. The magnetic fluid is a mixture of nano-sized magnetic particles and basic lubricating grease. Under the action of the magnetic field, a liquid sealing film is formed. The permanent magnet ring 11 forms a magnetic field, and the magnetic housing 2 guides the distribution of the magnetic field to enhance the sealing effect. While preventing external contaminants from entering the bearing, it also prevents lubricating oil leakage. The outer sealing gasket 12 further enhances the sealing performance. Compared with the setting of traditional sealing rings, the magnetic fluid and the outer sealing gasket 12 enhance the overall sealing effect. The threaded post 13 set at the lower end of the magnetic housing 2 enhances the magnetic field concentration through the spiral structure of the threaded post 13, increases the attraction of the magnetic fluid, and reduces the phenomenon of magnetic leakage.

[0026] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-efficiency, low-torque magnetic sealing assembly for a wheel hub unit, comprising an outer ring (1) and an inner ring (3) of the wheel hub, characterized in that: A mounting flange ring (4) is installed at the lower end of the inner ring (3) of the hub. The outer ring (1) of the hub is sleeved and installed on the outside of the inner ring (3). An inner ring (6) is fixedly installed on the inner side of the outer ring (1). Supporting arc plates (10) are provided on both the upper and lower sides of the inner ring (6). Multiple balls (8) are installed between the two supporting arc plates (10) and the inner ring (6). A permanent magnet ring (11) is installed at the upper end of the upper supporting arc plate (10). A magnetic conductive shell (2) is provided at the upper end of the permanent magnet ring (11). Magnetic fluid is injected between the magnetic conductive shell (2) and the permanent magnet ring (11). An annular groove is opened on the outer wall of the magnetic conductive shell (2). An outer sealing gasket (12) is installed inside the annular groove.

2. The high efficiency low torque hub unit magnetic seal assembly of claim 1, wherein: An oil groove (7) is provided between the inner ring (6) and the inner ring (3) of the hub.

3. The high efficiency low torque hub unit magnetic seal assembly of claim 1, wherein: An inner sealing gasket (9) is installed at the lower end of the supporting arc plate (10) described below.

4. The high efficiency low torque hub unit magnetic seal assembly of claim 1, wherein: The magnetic housing (2) is threadedly connected to the outer ring (1) of the hub by a locking bolt (14).

5. The high efficiency low torque hub unit magnetic seal assembly of claim 1, wherein: The lower end of the magnetic housing (2) is equipped with a threaded post (13), which is in contact with the magnetic fluid but not with the permanent magnet housing. An elastic magnetic ring (15) is installed on the outside of the threaded post (13).

6. The high efficiency low torque hub unit magnetic seal assembly of claim 1, wherein: Multiple connectors (5) are equidistantly installed on the outer side of the hub outer ring (1).

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