A dynamic sealing structure of an in-wheel motor, an in-wheel motor, a wheel, and a vehicle

Abstract

The utility model relates to a kind of dynamic sealing structure of in-wheel motor, in-wheel motor, wheel and vehicle, the dynamic sealing structure includes sealing element, oil plug and plugging element;The inner side wall of the rotor is equipped with annular oil groove, the groove bottom of the annular oil groove is equipped with first through-hole and second through-hole, the oil plug is movably installed in first through-hole, the plugging element is fixed in second through-hole;The side of the sealing element close to rotor is equipped with oil hole, the oil hole is located the directly below of first through-hole, the lower end of the oil plug is movably abutted on oil hole.Compared with prior art, the utility model has the advantages of convenient maintenance, no need to replace frequently, low cost and long service life.

Description

Technical Field

[0001] This utility model relates to the field of vehicle motor structure, and in particular to a dynamic sealing structure for a hub motor, a hub motor, a wheel, and a vehicle. Background Technology

[0002] With the rapid development and popularization of the new energy vehicle industry, hub motor technology, characterized by high space utilization, fast handling response, and high transmission efficiency, is receiving increasing attention and showing broad application prospects and market potential in electric vehicles, special vehicles, and intelligent mobile platforms. By integrating the drive unit directly inside the wheel, hub motors eliminate many mechanical components in traditional transmission systems, optimizing vehicle layout and space utilization while significantly improving power transmission efficiency and dynamic response performance.

[0003] However, hub motors still face many technical challenges in practical applications, one of which is the reliability and durability of the dynamic sealing system. Because hub motors operate at high speeds, under complex conditions, and in harsh environments for extended periods, their dynamic sealing systems must possess excellent performance in terms of dustproofing, waterproofing, temperature resistance, and aging resistance to ensure that critical internal components are not contaminated or corroded by external factors.

[0004] For example, utility model publication CN222351444U discloses a dynamic sealing structure, a hub motor, a wheel, and a vehicle. The dynamic sealing structure is circumferentially disposed between the rotor and stator of the motor and includes: a first sealing assembly, one side of which is used for sealingly mounting on one of the rotor or the stator, and the opposite side is used for interference fit with the other of the rotor or the stator; and a second sealing assembly, which is used for mounting on one of the rotor or the stator, the second sealing assembly including a blocking member disposed on the outside of the first sealing assembly.

[0005] Currently, the design life of conventional dynamic sealing structures is generally insufficient to meet the usage requirements throughout the entire vehicle's lifecycle, making them unsuitable for long-term stable operation as maintenance-free components. With accumulated usage time, sealing elements are prone to wear, hardening, deformation, and other failure phenomena, leading to a decline in sealing performance. This, in turn, triggers a series of chain reactions such as lubrication leaks and the intrusion of external contaminants, severely impacting the functional integrity and operational safety of the motor.

[0006] Therefore, the short lifespan and unsustainability of dynamic sealing systems have become one of the key bottlenecks restricting the large-scale commercial application of hub motors. Frequent maintenance and replacement not only increase the overall vehicle operating cost but also negatively impact reliability and user acceptance. Under current technological conditions, improving the durability, environmental adaptability, and service life of dynamic seals in hub motors has become a core issue that the industry urgently needs to address. Utility Model Content

[0007] The purpose of this utility model is to overcome the shortcomings of the prior art, such as the high maintenance difficulty, high cost and short service life of the dynamic sealing structure of the hub motor, and to provide a dynamic sealing structure of the hub motor, the hub motor, the wheel and the vehicle.

[0008] The objective of this utility model can be achieved through the following technical solutions: This solution provides a dynamic sealing structure for a hub motor, which is circumferentially disposed between the rotor and stator of the motor. The dynamic sealing structure includes a sealing element, an oil plug, and a sealing plug. The inner wall of the rotor is provided with an annular oil groove. The bottom of the annular oil groove is provided with a first through hole and a second through hole. The oil plug is movably installed in the first through hole, and the sealing member is fixed in the second through hole. The sealing member is provided with a filling hole on the side near the rotor. The filling hole is located directly below the first through hole, and the lower end of the oil plug is movably abutted against the filling hole.

[0009] Preferably, the first through hole is a threaded hole, the oil plug includes a sealing section and an adjusting section connected to each other, the adjusting section is threadedly connected to the first through hole, the diameter of the sealing section is larger than the diameter of the adjusting section, the sealing section is located in an annular oil groove, and the adjusting section has an adjusting groove at the end away from the sealing section.

[0010] Preferably, a sealing gasket is provided on the side of the sealing section away from the adjusting section.

[0011] Preferably, the height of the sealing section is less than the depth of the annular oil groove.

[0012] Preferably, the thread helix angle of the adjusting section is less than or equal to the equivalent friction angle.

[0013] Preferably, the sealing element comprises, from the outside to the inside, a rotating ring, a sealing body, and a stationary ring along the radial direction of the hub. The oil filling hole is opened on the rotating ring, the rotating ring abuts against the inner side wall of the rotor, and the stationary ring is mounted on the stator.

[0014] Preferably, the axial width of the moving ring is greater than the axial width of the annular oil groove, and the filling hole connects the annular oil groove and the sealing body.

[0015] This solution also provides a hub motor, including the dynamic sealing structure of the hub motor described above.

[0016] This solution also provides a wheel, including the aforementioned hub motor.

[0017] This solution also provides a vehicle, including the aforementioned wheels.

[0018] Compared with the prior art, the present invention has the following advantages: (1) This solution provides an annular oil groove on the inner wall of the rotor to store oil between the rotor and the seal. A corresponding oil filling hole is provided on the outer side of the seal. The opening and closing of the oil filling hole is controlled by adjusting the oil plug at the bottom of the annular oil groove, thereby adding the oil stored in the annular oil groove to the seal, lubricating the rotating part of the seal, reducing the friction of the seal, and thus effectively extending the service life of the seal. Moreover, the structure is simple and easy to operate by adjusting the oil plug.

[0019] (2) The thread angle of the adjustment section of the oil plug is designed in this scheme so that the thread helix angle is less than or equal to the equivalent friction angle, thereby realizing the self-locking of the oil plug and ensuring that the sealing section can reliably abut against the oil filling hole during the operation of the hub motor to seal the oil passage inside the sealing component. Attached Figure Description

[0020] Figure 1 A schematic diagram of the dynamic sealing structure of the hub motor provided by this utility model; Figure 2 A schematic diagram of the structure of the sealing element provided by this utility model; In the diagram: 1. Rotor, 2. Seal, 3. Oil plug, 4. Stator, 11. Annular oil groove, 21. Oil filling hole, 22. Moving ring, 23. Sealing body, 24. Stationary ring, 31. Sealing section, 32. Adjusting section. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are 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.

[0025] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0026] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0027] Example 1 like Figure 1 As shown, this embodiment provides a dynamic sealing structure for a hub motor, which is circumferentially disposed between the rotor 1 and the stator 4 of the motor. The dynamic sealing structure includes a sealing element 2, an oil plug 3, and a sealing element. The inner wall of the rotor 1 is provided with an annular oil groove 11. The bottom of the annular oil groove 11 is provided with a first through hole and a second through hole. The oil plug 3 is movably installed in the first through hole, and the sealing member is fixed in the second through hole. The sealing member 2 is provided with a filling hole 21 on the side near the rotor 1. The filling hole 21 is located directly below the first through hole, and the lower end of the oil plug 3 is movably abutted against the filling hole 21.

[0028] The first through hole is a threaded hole. The oil plug 3 includes a sealing section 31 and an adjusting section 32 that are connected to each other. The adjusting section 32 is threadedly connected to the first through hole. The diameter of the sealing section 31 is larger than the diameter of the adjusting section 32. The sealing section 31 is located in the annular oil groove 11. The adjusting section 32 is provided with an adjusting groove at the end away from the sealing section 31.

[0029] By adding an annular groove to store oil between the housing and the dynamic seal, and machining a hole in the dynamic seal to allow oil to flow into the seal, lubricating the rotating parts of the seal, reducing friction, and effectively extending the seal's service life, the following measures are taken. Two threaded holes are machined in the housing, and a screw is tightened from inside the housing. This screw can be adjusted from the outside by reverse tightening, thereby regulating the flow of oil into the seal. After the seal is installed, lubricating oil is added to the annular oil groove 11 through the other threaded hole. A sealing component is then welded into this threaded hole for sealing. Adjustment is achieved by operating the oil plug. The structure is simple and easy to operate, reducing the difficulty and cost of later maintenance.

[0030] An annular oil groove is provided on the inner wall of the rotor to store oil between the rotor and the seal. A corresponding oil filling hole is provided on the outer side of the seal. The opening and closing of the oil filling hole is controlled by the oil plug at the bottom of the annular oil groove, thereby adding the oil stored in the annular oil groove into the seal. In this embodiment, a sealing gasket is provided on the side of the sealing section 31 away from the adjusting section 32. The sealing gasket seals the connection between the sealing section and the oil filling hole 21, ensuring the sealing effect of the sealing section on the oil filling hole and improving the sealing reliability. The height of the sealing section 31 is less than the depth of the annular oil groove 11, allowing the oil plug to be completely placed within the annular oil groove 11, avoiding any impact on the structural installation of the seal. During assembly, the oil plug needs to be installed into the first through hole from inside the rotor, so that the sealing section is located within the annular oil groove for subsequent adjustment, serving to directionally seal the oil filling hole.

[0031] In a preferred embodiment, the thread helix angle of the adjusting section 32 is less than or equal to the equivalent friction angle. The thread angle of the adjusting section of the oil plug is designed so that its thread helix angle is less than or equal to the equivalent friction angle, thereby enabling the oil plug to self-lock and ensuring that the sealing section can reliably abut against the oil filling hole during the operation of the hub motor, thus sealing the internal oil passage of the seal.

[0032] In this embodiment, as Figure 1 and 2 As shown, the sealing element 2 includes a rotating ring 22, a sealing body 23 and a stationary ring 24 in sequence from the outside to the inside along the radial direction of the hub. The oil filling hole 21 is opened on the rotating ring 22. The rotating ring 22 abuts against the inner side wall of the rotor 1. The stationary ring 24 is installed on the stator 4.

[0033] The structure of the sealing body is not limited here, including sealing rings for static sealing, such as O-rings, X-rings, U-rings, and wedge-shaped sealing rings, as well as an elastic compensation mechanism, which can be a spring or a push ring. This sealing structure allows for easy addition of lubricating oil to the rotating interior of the sealing element, ensuring that the sealing element rotates under low friction and effectively extending the service life of the sealing element.

[0034] In this embodiment, the axial width of the rotating ring 22 is greater than the axial width of the annular oil groove 11, and the oil filling hole 21 connects the annular oil groove 11 and the sealing body 23. The annular oil groove 11 is located on one side of the rotating ring, and there is no relative rotation between the rotating ring and the rotor during operation, so the annular oil groove 11 is sealed based on the rotating ring.

[0035] This embodiment also provides a hub motor, including the dynamic sealing structure of the hub motor described above, which can effectively extend the service life of the hub motor, and the sealing structure of the hub motor is easy to maintain.

[0036] This embodiment also provides a wheel, including the aforementioned hub motor, which can improve the reliability and stability of wheel rotation.

[0037] This embodiment also provides a vehicle including the aforementioned wheels, ensuring normal vehicle operation and reducing vehicle maintenance difficulty and cost.

[0038] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A dynamic sealing structure for a hub motor, circumferentially disposed between the rotor (1) and stator (4) of the motor, characterized in that, The dynamic sealing structure includes a sealing element (2), an oil plug (3), and a sealing element; The inner wall of the rotor (1) is provided with an annular oil groove (11). The bottom of the annular oil groove (11) is provided with a first through hole and a second through hole. The oil plug (3) is movably installed in the first through hole, and the sealing member is fixed in the second through hole. The sealing member (2) is provided with a filling hole (21) on the side near the rotor (1). The filling hole (21) is located directly below the first through hole, and the lower end of the oil plug (3) is movably abutted against the filling hole (21).

2. The dynamic sealing structure of a hub motor according to claim 1, characterized in that, The first through hole is a threaded hole. The oil plug (3) includes a sealing section (31) and an adjusting section (32) connected to each other. The adjusting section (32) is threadedly connected to the first through hole. The diameter of the sealing section (31) is larger than the diameter of the adjusting section (32). The sealing section (31) is located in the annular oil groove (11). The adjusting section (32) has an adjusting groove at one end away from the sealing section (31).

3. The dynamic sealing structure of a hub motor according to claim 2, characterized in that, The sealing section (31) is provided with a sealing gasket on the side away from the adjusting section (32).

4. The dynamic sealing structure of a hub motor according to claim 2, characterized in that, The height of the sealing section (31) is less than the depth of the annular oil groove (11).

5. The dynamic sealing structure of a hub motor according to claim 2, characterized in that, The thread helix angle of the adjustment section (32) is less than or equal to the equivalent friction angle.

6. The dynamic sealing structure of a hub motor according to claim 1, characterized in that, The sealing element (2) includes a rotating ring (22), a sealing body (23) and a stationary ring (24) in the radial direction of the hub from the outside to the inside. The oil filling hole (21) is opened on the rotating ring (22). The rotating ring (22) abuts against the inner side wall of the rotor (1). The stationary ring (24) is installed on the stator (4).

7. The dynamic sealing structure of a hub motor according to claim 6, characterized in that, The axial width of the moving ring (22) is greater than the axial width of the annular oil groove (11), and the oil filling hole (21) connects the annular oil groove (11) and the sealing body (23).

8. A hub motor, characterized in that, The dynamic sealing structure of a hub motor as described in any one of claims 1-7 is included.

9. A wheel, characterized in that, Including the hub motor as described in claim 8.

10. A vehicle, characterized in that, Including the wheel as described in claim 9.

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