Brake adapter structure and hub electric motor

Abstract

Disclosed in the present application are a brake adapter structure and a hub electric motor. The brake adapter structure comprises a first connector and a second connector connected to the first connector. A first connecting surface of the first connector is connected to a rotor assembly of the hub electric motor, a second connecting surface of the second connector is connected to a brake disc, the second connecting surface is parallel to the first connecting surface, and the inner diameter of the second connecting surface is different from the inner diameter of the first connecting surface, such that a rotor housing having the same outer diameter can be connected to brake discs having different outer diameters, the size of the brake disc can be adjusted according to requirements, and a brake disc having a larger braking radius can be used, removing the limitation of the rotor housing on the braking performance of the brake disc; and a brake disc having the same outer diameter can be connected to rotor housings having different outer diameters, and different vehicle models can use the same brake disc and brake caliper, improving the universality of the brake caliper and the brake disc, and reducing the development costs of the brake disc and the brake caliper.

Description

A brake adapter structure and a hub motor Technical Field

[0001] The present application belongs to the technical field of hub motors, and specifically relates to a brake adapter structure and a hub motor. Background Art

[0002] In-wheel motor drive is a key development direction for new energy vehicles. Its principle is to install a motor inside the vehicle's wheel rim, allowing the motor to directly drive the wheel. The in-wheel motor's mounting side houses components such as the brake disc, brake caliper, and associated wiring harnesses, cooling lines, and brake lines. Water cooling is required to dissipate heat during motor operation. Due to limitations in NdFeB permanent magnet technology, demagnetization begins at around 200°C. During emergency braking, the brake disc surface temperature can reach over 500°C. This excess heat is transferred through the brake disc and mounting bolts to the motor housing, adversely affecting heat dissipation. High temperatures can accelerate motor aging and lead to motor breakdown and burnout.

[0003] To solve the above-mentioned heat dissipation problem, the existing technology adds a thermal insulation gasket between the motor housing and the brake disc to reduce the contact area between the brake disc and the motor housing, thereby reducing heat conduction and achieving the purpose of heat insulation. However, the brake disc is directly connected to the rotor housing of the hub motor. The outer diameter of the brake disc is limited by the outer diameter of the rotor housing of the hub motor. Cooling pipes, brake pipes and wiring harnesses need to be arranged inside the brake disc. To avoid interference between the pipes and wiring harnesses, the inner diameter of the brake disc should not be too small. Therefore, it is impossible to replace the brake disc with a larger braking radius, and the braking performance is limited.

[0004] Summary of the Invention

[0005] In order to solve the technical problems in the prior art that the outer diameter of the brake disc is limited by the outer diameter of the rotor housing of the hub motor, and to avoid interference with pipes and wiring harnesses, the inner diameter of the brake disc should not be too small, and the brake disc with a larger braking radius cannot be replaced, resulting in limited braking performance, the present application provides a brake adapter structure and a hub motor.

[0006] In a first aspect of the present application, a brake adapter structure is provided, which is applied to a hub motor with a brake disc, comprising:

[0007] a first connecting member, the first connecting member being provided with a first connecting surface configured to connect to the rotor assembly of the hub motor;

[0008] A second connecting member connected to the first connecting member is provided with a second connecting surface configured to connect to the brake disc, the second connecting surface is parallel to the first connecting surface, and the inner diameter of the second connecting surface is different from the inner diameter of the first connecting surface.

[0009] In some embodiments, an inner diameter of the second connecting surface is larger than an inner diameter of the first connecting surface.

[0010] In some embodiments, the first connecting member is a ring plate, and the first connecting surface is arranged at a position of the first connecting member close to the inner ring; the second connecting member is a ring plate, and the second connecting surface is arranged at a position of the second connecting member close to the outer ring.

[0011] In some embodiments, a plurality of first mounting holes are provided on the first connecting surface along a circumferential direction, and the first mounting holes are configured to be connected to the rotor housing of the rotor assembly; a plurality of second mounting holes are provided on the second connecting surface along a circumferential direction, and the second mounting holes are configured to be connected to the fixing portion of the brake disc.

[0012] In some embodiments, a position of the second mounting hole is staggered from a position of the first mounting hole.

[0013] In some embodiments, a connecting portion is further included between the first connecting member and the second connecting member, wherein the connecting portion is connected to the first connecting member and the second connecting member respectively, so that an axial gap is formed between the first connecting member and the second connecting member.

[0014] In some embodiments, a plurality of the connecting parts are provided, and the plurality of the connecting parts are spaced apart along the circumferential direction; a ventilation hole communicating with the axial gap is formed between two adjacent connecting parts.

[0015] In some embodiments, the connecting portion is a ring sleeve, and the ring sleeve is provided with a plurality of ventilation holes that are spaced apart along the circumferential direction and communicate with the axial gap.

[0016] In some embodiments, the outer wall of the connecting portion is provided with a plurality of reinforcing ribs protruding outwardly along the axial direction, and the plurality of reinforcing ribs and the plurality of ventilation holes are alternately arranged;

[0017] Alternatively, the outer end surface of the first connecting member and the outer wall of the connecting portion are both provided with a plurality of reinforcing ribs protruding outwardly in the axial direction, and the plurality of reinforcing ribs and the plurality of ventilation holes are alternately arranged.

[0018] In a second aspect of the present application, a hub motor is provided, comprising a rotor assembly, a brake disc and the brake adapter structure, wherein the rotor assembly is connected to a first connection surface of the brake adapter structure, and the brake disc is connected to a second connection surface of the brake adapter structure.

[0019] A brake adapter structure provided according to one or more embodiments of the present application has the following beneficial effects compared to the prior art:

[0020] The rotor assembly of the hub motor is connected through the first connecting surface of the first connecting member, and the second connecting surface of the second connecting member is connected to the brake disc. The second connecting surface is parallel to the first connecting surface, and the inner diameter of the second connecting surface is different from the inner diameter of the first connecting surface. The rotor assembly with the same outer diameter can be connected to the brake discs with different outer diameters. The size of the brake disc can be adjusted as needed, and a brake disc with a larger braking radius can be used to remove the restriction of the rotor assembly on the braking performance of the brake disc. At the same time, for different vehicle models, the brake caliper of the original hub motor can be borrowed, so that the design of the brake caliper and brake disc is universal; moreover, the inner diameter of the brake disc can be appropriately increased, so that the layout of the cooling pipe, brake pipe and wiring harness is more flexible and less likely to interfere; in addition, the adapter structure can separate the brake disc and the motor to avoid direct contact between the two, play a role in heat insulation, and avoid the high temperature generated by the brake disc during emergency braking being directly transferred to the rotor assembly, resulting in demagnetization of the rotor permanent magnet and degradation of the motor performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 shows a first structural diagram of a brake adapter structure in one or more embodiments of the present application.

[0022] FIG2 shows a second structural diagram of the brake adapter structure in one or more embodiments of the present application.

[0023] FIG3 shows a schematic structural diagram of a hub motor in one or more embodiments of the present application.

[0024] FIG4 shows an exploded view of a hub motor in one or more embodiments of the present application.

[0025] Explanation of the accompanying drawings: 100-first connecting member, 110-first connecting surface, 1101-first mounting hole; 200-second connecting member, 210-second connecting surface, 2101-second mounting hole; 300-connecting portion, 310-ventilation hole, 320-reinforcement rib; 400-rotor housing, 410-first end surface; 500-brake disc, 510-fixing portion, 5101-second end surface; 600-brake caliper. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to understand the present application more clearly, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of this application.

[0027] Please refer to Figures 1, 2 and 4. An embodiment of the first aspect of the present application provides a brake adapter structure applied to a hub motor with a brake disc 500, including a first connector 100 and a second connector 200 connected to the first connector 100.

[0028] The first connecting member 100 is provided with a first connecting surface 110 configured to be connected to the rotor assembly of the hub motor; the first connecting surface 110 is connected to the first end surface 410 of the rotor housing 400 of the rotor assembly.

[0029] The second connecting member 200 is provided with a second connecting surface 210 configured to connect to the brake disc 500. The second connecting surface 210 is connected to the second end surface 5101 of the fixing portion 510 of the brake disc 500. The second connecting surface 210 is parallel to the first connecting surface 110, and the inner diameter of the second connecting surface 210 is different from the inner diameter of the first connecting surface 110.

[0030] A brake adapter structure provided in an embodiment of the present application connects the first end face 410 of the rotor housing 400 of the hub motor through the first connecting surface 110 of the first connecting member 100, and connects the second end face 5101 of the fixing portion 510 of the brake disc 500 through the second connecting surface 210 of the second connecting member 200. The second connecting surface 210 is parallel to the first connecting surface 110, and the inner diameter of the second connecting surface 210 is different from the inner diameter of the first connecting surface 110. The rotor housing 400 with the same outer diameter can be connected to the brake disc 500 with different outer diameters. The size of the brake disc 500 can be adjusted as needed, and a brake disc 500 with a larger braking radius can be used to remove the restriction of the rotor housing 400 on the braking performance of the brake disc 500. At the same time, brake discs 500 of the same outer diameter can be connected to rotor housings 400 of different outer diameters. For different vehicle models, the original in-wheel motor's brake disc 500 and brake caliper 600 can be used, making the brake caliper 600 and brake disc 500 more versatile and reducing the development cost of the brake disc 500 and brake caliper 600. Furthermore, the inner diameter of the brake disc 500 can be appropriately increased, making the layout of cooling lines, brake lines, and wiring harnesses more flexible and less likely to interfere. Furthermore, the adapter structure separates the brake disc 500 and the motor, preventing direct contact between the two and providing thermal insulation. After dissipating some heat, the adapter structure then transfers the heat to the rotor housing 400, preventing the high temperature generated by the brake disc 500 during emergency braking from being directly transferred to the rotor housing 400, which could demagnetize the rotor permanent magnets and reduce motor performance.

[0031] In some embodiments, the inner diameter of the second connection surface 210 is larger than the inner diameter of the first connection surface 110. By setting the inner diameter of the second connection surface 210 larger than the inner diameter of the first connection surface 110, the outer diameter of the brake disc 500 can be made larger than the outer diameter of the rotor housing 400 of the in-wheel motor. This makes the braking radius of the brake disc 500 no longer limited by the outer diameter of the rotor housing 400. The connection structure acts as an amplification mechanism. In-wheel motors with rotor housings 400 of the same size can use brake discs 500 with larger braking radius, thereby improving braking performance and providing design convenience for setting different sports attributes for the same vehicle model.

[0032] In some embodiments, the first connecting member 100 is a ring plate. Because the inner diameter of the second connecting surface 210 is larger than the inner diameter of the first connecting surface 110 (i.e., it acts as an amplification), the first connecting surface 110 can be positioned near the inner ring of the first connecting member 100. Positioning the first connecting surface 110 near the inner ring of the first connecting member 100 can increase the difference in inner diameter between the first connecting surface 110 and the second connecting surface 210, thereby increasing the ratio of the outer diameter of the fixing portion 510 of the brake disc 500 connected to the adapter structure to the outer diameter of the rotor housing 400 and improving versatility.

[0033] In some embodiments, the first connection surface 110 is provided with a plurality of first mounting holes 1101 along the circumferential direction. The first mounting holes 1101 are configured to connect to the rotor housing 400 of the hub motor. The first connection surface 110 is provided with a plurality of first mounting holes 1101 along the circumferential direction, and bolts are passed through the first mounting holes 1101 to connect to the first end surface 410 of the rotor housing 400.

[0034] In some other embodiments, the connection method between the first connecting surface 110 and the first end surface 410 of the rotor housing 400 is not limited to the above-mentioned bolt connection, and other connection methods can also be used as long as a detachable connection between the first connecting surface 110 and the rotor housing 400 can be achieved.

[0035] In some embodiments, the second connecting member 200 is a ring plate. Because the inner diameter of the second connecting surface 210 is larger than the inner diameter of the first connecting surface 110 (i.e., it acts as an amplification), the second connecting surface 210 can be positioned near the outer ring of the second connecting member 200. Positioning the second connecting surface 210 near the outer ring of the second connecting member 200 can increase the difference in inner diameter between the second connecting surface 210 and the first connecting surface 110, thereby increasing the ratio of the outer diameter of the fixing portion 510 of the brake disc 500 connected to the adapter structure to the outer diameter of the rotor housing 400 and improving versatility.

[0036] In some embodiments, a plurality of second mounting holes 2101 are circumferentially disposed on the second connection surface 210. The second mounting holes 2101 are staggered from the first mounting holes 1101 and are configured to connect to the fixing portion 510 of the brake disc 500. If the inner diameters of the first and second connection surfaces 110 and 210 are different, the axes of the second mounting holes 2101 and the axes of the first mounting holes 1101 are not coextensive and can be arbitrarily arranged and staggered circumferentially. If the inner diameters of the first and second connection surfaces 110 and 210 are the same, the axes of the first and second mounting holes 1101 and 2101 can be staggered circumferentially by a certain angle. The staggered position of the second mounting holes 2101 relative to the first mounting holes 1101 provides space for operation during installation, preventing interference and impact, and improving the stability and reliability of the adapter structure.

[0037] In some embodiments, the in-wheel motor adapter structure further includes a connecting portion 300 positioned between the first connector 100 and the second connector 200. The connecting portion 300 is connected to the first connector 100 and the second connector 200, respectively, to form an axial gap between the first connector 100 and the second connector 200. The provision of the connecting portion 300 increases the distance for heat transfer between the first connector 100 and the second connector 200, further improving the heat dissipation of the adapter structure and preventing the high temperature generated by the brake disc 500 from being transferred to the rotor housing 400 during emergency braking, which could demagnetize the rotor permanent magnets and reduce motor performance. Furthermore, the provision of the axial gap provides sufficient space for the installation of the brake caliper 600, facilitating installation of the brake caliper 600 without interfering with the installation of the brake caliper 600 and improving the stability and reliability of the adapter structure.

[0038] In some further embodiments, the connection portion 300 can be made of insulating materials, such as glass fiber, asbestos, rock wool, silicate, aerogel felt, vacuum panel and other insulating materials, to insulate the brake disc 500 and the rotor housing 400. The axial gap forms an air gap, which can improve the thermal insulation effect and prevent the high temperature generated by the brake disc 500 during emergency braking from being transferred to the rotor housing 400, thereby causing demagnetization of the rotor permanent magnet and degradation of motor performance.

[0039] In further embodiments, the connection portion 300 may be made of a thermally conductive material. The thermally conductive material may be a metal material, an inorganic non-metallic material, or a composite material. Metal materials such as copper, aluminum, steel, titanium, and magnesium have excellent thermal conductivity and stability and are suitable for heat conduction and heat dissipation in high-temperature and high-pressure environments. Inorganic non-metallic materials such as ceramics, glass, and oxides have poor thermal conductivity but high strength. Composite materials such as metal composites and inorganic composites can maintain high thermal conductivity while also having good strength and heat resistance. Thermally conductive materials are generally strong, which can increase the strength of the connection portion 300, thereby improving the stability and reliability of the device.

[0040] In some embodiments, cooling fins can be provided on the inner surfaces of the first connector 100 and the second connector 200, and the fins extend into the axial gap to increase the heat exchange area with the air, thereby improving the heat dissipation effect, so that less heat is transferred from the brake disc 500 to the rotor housing 400, avoiding the high temperature generated by the brake disc 500 during emergency braking to be transferred to the rotor housing 400, resulting in demagnetization of the rotor permanent magnet and degradation of motor performance, thereby improving the service life of the motor.

[0041] In the above embodiments, the axial gap can make up for the installation space size difference between the rotor housing 400 and the brake disc 500. The installation space size difference between the rotor housing 400 and the brake disc 500 with different axial sizes can be filled by the corresponding axial gap, thereby improving the applicability of the transition structure. It can be applicable to brake discs 500 with different thicknesses and rotor housings 400 with different axial sizes, making the brake disc 500 more versatile and reducing the development cost of the brake disc 500 and the brake caliper 600.

[0042] In some embodiments, the connecting portion 300 is provided in plurality, and the plurality of connecting portions 300 are arranged at intervals along the circumferential direction (not shown in the figure); a ventilation hole 310 connected to the axial gap is formed between two adjacent connecting portions 300. By arranging the plurality of connecting portions 300 at intervals along the circumferential direction, the first connecting member 100 and the second connecting member 200 are connected, so that an axial gap is formed between the first connecting member 100 and the second connecting member 200, and a ventilation hole 310 is formed between two adjacent connecting portions 300, and the ventilation hole 310 is connected to the axial gap, further improving the heat dissipation effect, so that less heat is transferred to the rotor housing 400, and avoiding the high temperature generated by the brake disc 500 during emergency braking. The large amount of heat is transferred to the rotor housing 400, which may cause demagnetization of the rotor permanent magnet and degradation of motor performance, thereby increasing the service life of the motor.

[0043] In other embodiments, the connecting portion 300 is a ring sleeve, and the outer wall of the connecting portion 300 is provided with a plurality of ventilation holes 310, which open into the axial gap. The ventilation holes 310 open into the axial gap, allowing air to flow vertically toward the first connecting member 100 and the second connecting member 200, further improving heat dissipation and reducing heat transfer to the rotor housing 400. This prevents high temperatures generated by the brake disc 500 during emergency braking from being transferred to the rotor housing 400, which could demagnetize the rotor permanent magnets and reduce motor performance, thereby increasing the motor's service life.

[0044] In some embodiments, the connecting part 300, the first connecting member 100 and the second connecting member 200 can be made separately, and then the three can be welded (the connecting part uses a heat-conducting material such as metal) or bonded (the connecting part uses an insulating material), or connected by bolts or the like.

[0045] In other embodiments, the connecting portion 300, the first connecting member 100 and the second connecting member 200 can be integrally formed, such as integrally cast or injection molded. The integral molding makes the transition structure have better integrity and higher structural strength, and eliminates the assembly process, thereby improving assembly efficiency.

[0046] In some further embodiments, the outer wall of the connection portion 300 is provided with a plurality of reinforcing ribs 320 protruding axially outward, and the plurality of reinforcing ribs 320 are arranged alternately with the plurality of ventilation holes 310. The reinforcing ribs 320 are attached to the outer wall of the connection portion 300 to strengthen the outer wall of the connection portion 300. A reinforcing rib 320 is provided between two adjacent ventilation holes 310 to compensate for the strength deficiency caused by the ventilation holes 310. The reinforcing ribs 320 also improve the heat dissipation effect of the adapter structure.

[0047] In further embodiments, the outer end surface of the first connector 100 and the outer wall of the connecting portion 300 are both provided with a plurality of reinforcing ribs 320 protruding axially outward, and the plurality of reinforcing ribs 320 are alternately arranged with the plurality of ventilation holes 310. As shown in Figures 1 and 2, the reinforcing ribs 320 can be L-shaped, and the reinforcing ribs 320 fit the outer wall of the connecting portion 300 and the outer end surface of the first connector 100 to strengthen the outer wall of the connecting portion 300 and the outer end surface of the first connector 100. A reinforcing rib 320 is provided between two adjacent ventilation holes 310 to compensate for the strength defects caused by the ventilation holes 310. At the same time, the reinforcing ribs 320 can also improve the heat dissipation effect of the adapter structure.

[0048] In some embodiments, the hub motor adapter structure is made of aluminum alloy. Since the heat dissipation performance of aluminum alloy is better than that of pure metal, the use of aluminum alloy can further improve the heat dissipation effect of the adapter structure, so that less heat is transferred to the rotor housing 400, avoiding the high temperature generated by the brake disc 500 during emergency braking. The large amount of heat is transferred to the rotor housing 400, which causes the demagnetization of the rotor permanent magnet and the degradation of motor performance, thereby increasing the service life of the motor.

[0049] The working principle of the brake adapter structure is: the first end face 410 of the rotor housing 400 of the hub motor is connected through the first connecting surface 110 of the first connecting member 100, and the second connecting surface 210 of the second connecting member 200 is connected to the second end face 5101 of the fixing part 510 of the brake disc 500. The rotor housing 400 with the same outer diameter can be connected to the brake disc 500 with different outer diameters. The size of the brake disc 500 can be adjusted as needed, and a brake disc 500 with a larger braking radius can be used, thereby removing the restriction of the rotor housing 400 on the braking performance of the brake disc 500. At the same time, brake discs 500 of the same outer diameter can be connected to rotor housings 400 of different outer diameters. For different vehicle models, the brake discs 500 and brake calipers 600 of the original in-wheel motor can be used, making the brake calipers 600 and brake discs 500 more versatile and reducing the development costs of the brake discs 500 and brake calipers 600. The inner diameter of the brake disc 500 can be appropriately increased, making the layout of cooling lines, brake lines, and wiring harnesses more flexible and less likely to interfere. Furthermore, the adapter structure separates the brake disc 500 and the motor, preventing direct contact between the two and providing thermal insulation. After dissipating some of the heat, the adapter structure then transfers the heat to the rotor housing 400, preventing the high temperature generated by the brake disc 500 during emergency braking from being directly transferred to the rotor housing 400, which could demagnetize the rotor permanent magnets and reduce motor performance.

[0050] In a second embodiment of the present application, with reference to Figures 1 to 4, a hub motor is provided, comprising a rotor assembly, a brake disc 500 and the brake adapter structure of the first aspect, wherein the first end face 410 of the rotor housing 400 of the rotor assembly is connected to the first connecting face 110 of the brake adapter structure, and the second end face 5101 of the fixing portion 510 of the brake disc 500 is connected to the second connecting face 210 of the brake adapter structure.

[0051] In some embodiments, the in-wheel motor may further include a brake caliper 600 , which is mounted on the brake disc 500 .

[0052] An embodiment of the present application provides a hub motor with a brake adapter structure. The first connecting surface 110 of the first connector 100 connects to the first end surface 410 of the hub motor's rotor housing 400. The second connecting surface 210 of the second connector 200 connects to the second end surface 5101 of the fixing portion 510 of the brake disc 500. The inner diameter of the second connecting surface 210 can be the same as or different from the inner diameter of the first connecting surface 110. Rotor housings 400 with the same outer diameter can be connected to brake discs 500 with different outer diameters, allowing for the use of brake discs 500 with larger braking radii, thus eliminating the limitations imposed by the rotor housing 400 on the braking performance of the brake disc 500. Furthermore, brake discs 500 with the same outer diameter can be connected to rotor housings 400 with different outer diameters, improving the interoperability of the brake caliper 600 and the brake disc 500, reducing development costs for the brake disc 500 and the brake caliper 600. The inner diameter of the brake disc 500 can be appropriately increased, making the layout of cooling lines, brake lines, and wiring harnesses more flexible and less likely to interfere. In addition, the transition structure can separate the brake disc 500 and the motor to avoid direct contact between the two and play a role in heat insulation.

[0053] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0054] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do 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 should not be understood as a limitation on the present application.

[0055] In this application, unless otherwise specified or limited, the terms "connect," "fix," etc. should be understood broadly. For example, "fix" can mean fixed connection, detachable connection, or integration; it can mean mechanical connection or electrical connection; it can mean direct connection or indirect connection through an intermediate medium; it can mean internal communication between two elements or interaction between two elements. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0056] In addition, the terms "first," "second," and so on, used in this application are 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, features specified as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0057] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A brake adapter structure, applied to a hub motor with a brake disc, characterized in that: include: A first connecting member, wherein the first connecting member is provided with a first connecting surface configured to be connected to a rotor assembly of the hub motor; A second connecting member connected to the first connecting member, the second connecting member is provided with a second connecting surface configured to connect to the brake disc, the second connecting surface is parallel to the first connecting surface, and the inner diameter of the second connecting surface is different from the inner diameter of the first connecting surface.

2. The brake adapter structure according to claim 1, characterized in that: An inner diameter of the second connecting surface is greater than an inner diameter of the first connecting surface.

3. The brake adapter structure according to claim 1, characterized in that: The first connecting member is a ring plate, and the first connecting surface is arranged at a position of the first connecting member close to the inner ring; the second connecting member is a ring plate, and the second connecting surface is arranged at a position of the second connecting member close to the outer ring.

4. The brake adapter structure according to claim 3, characterized in that: A plurality of first mounting holes are arranged on the first connecting surface along a circumferential direction, and the first mounting holes are configured to be connected to the rotor housing of the rotor assembly; a plurality of second mounting holes are arranged on the second connecting surface along a circumferential direction, and the second mounting holes are configured to be connected to the fixing part of the brake disc.

5. The brake adapter structure according to claim 4, characterized in that: The position of the second mounting hole is staggered from the position of the first mounting hole.

6. The brake adapter structure according to any one of claims 1 to 5, characterized in that: It also includes a connecting portion located between the first connecting member and the second connecting member, wherein the connecting portion is connected to the first connecting member and the second connecting member respectively, so that an axial gap is formed between the first connecting member and the second connecting member.

7. The brake adapter structure according to claim 6, characterized in that: There are a plurality of connecting parts, and the connecting parts are arranged at intervals along the circumferential direction; a ventilation hole connected to the axial gap is formed between two adjacent connecting parts.

8. The brake adapter structure according to claim 6, characterized in that: The connecting portion is a ring sleeve, and the ring sleeve is provided with a plurality of ventilation holes which are arranged at intervals along the circumferential direction and communicated with the axial gap.

9. The brake adapter structure according to claim 8, characterized in that: The outer wall of the connecting portion is provided with a plurality of reinforcing ribs protruding outwardly along the axial direction, and the plurality of reinforcing ribs and the plurality of ventilation holes are arranged alternately; Alternatively, the outer end surface of the first connecting member and the outer wall of the connecting portion are both provided with a plurality of reinforcing ribs protruding outwardly along the axial direction, and the plurality of reinforcing ribs and the plurality of ventilation holes are alternately arranged.

10. A hub motor, characterized in that: It comprises a rotor assembly, a brake disc and a brake adapter structure according to any one of claims 1 to 9, wherein the rotor assembly is connected to a first connection surface of the brake adapter structure, and the brake disc is connected to a second connection surface of the brake adapter structure.

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