Motor hub structure for electric vehicle and manufacturing method

Abstract

The invention belongs to the technical field of hubs, and particularly relates to a motor hub structure for an electric vehicle and a manufacturing method.The motor hub structure comprises an inner ring body welded in a rim, an embedded annular groove is formed in the outer side face of the inner ring body, and an embedded protruding ring matched with the embedded annular groove is arranged at the middle end of the rim in an inward protruding mode; end cover connecting holes are formed in the two ends of the inner ring body respectively, and an air nozzle mounting hole is formed in the rim. According to the motor hub structure for the electric vehicle and the manufacturing method, the structure is reasonable, the hub and the inner ring body are combined, the diameter of the inner ring body can be increased, and a large hub motor can be contained.

Description

Technical Field

[0001] This invention belongs to the field of wheel hub technology, specifically referring to a motor wheel hub structure and manufacturing method for electric vehicles. Background Technology

[0002] Electric wheel hub structures are commonly used in existing electric vehicles. These structures combine the drive motor, tires, and other components into a single unit to drive the electric vehicle. They offer advantages such as safety, stability, and compact structure. Currently, most electric wheel hubs on the market are of a split design, consisting of a rim, an inner ring, and aluminum alloy cover plates on both sides that are fixed with screws and used for sealing. To increase the connection stability between the inner ring and the aluminum alloy cover plates, most manufacturers weld latches onto the inner ring and create internal threads on the latches. The aluminum alloy cover plates are then connected to the inner ring via screws and internal threads. The inner ring and latches are welded together manually, which is time-consuming and labor-intensive, and can also cause incomplete welds, reducing the product qualification rate. Some manufacturers, in order to ensure the connection stability between the cover plates and the inner ring, can only use a thickened inner ring and directly create threaded holes on both sides of the inner ring. Since the outer diameter of the wheel hub is fixed according to national standards, the size of the wheel hub motor can only be adjusted according to the inner ring diameter. The smaller the inner ring diameter, the smaller the wheel hub motor must be, which can easily affect the motor power and the electric vehicle's power and speed. Summary of the Invention

[0003] The purpose of this invention is to provide a motor hub structure and manufacturing method for electric vehicles that has a reasonable structure, combines the hub and inner ring body, can increase the diameter of the inner ring body, and can accommodate a larger hub motor.

[0004] The objective of this invention is achieved as follows:

[0005] A motor hub structure for an electric vehicle includes an inner ring body welded into a rim. The outer side of the inner ring body is provided with an embedded ring groove. The middle end of the rim is provided with an embedded protruding ring adapted to the embedded ring groove. The two ends of the inner ring body are respectively provided with end cap connecting holes, and the rim is provided with an air nozzle mounting hole.

[0006] In the above-mentioned motor hub structure for electric vehicles, an inclined arc groove is provided on the side of the inner ring body near the air nozzle mounting hole.

[0007] In the above-described motor hub structure for electric vehicles, the cross-section of the embedded annular groove is an isosceles trapezoidal structure.

[0008] In the above-described motor hub structure for electric vehicles, the bottom width of the embedded annular groove 21 is between 19.3 and 21.3 mm.

[0009] In the above-mentioned motor hub structure for electric vehicles, the groove depth of the embedded annular groove is between 3-5 mm.

[0010] In the above-mentioned motor hub structure for electric vehicles, the inner diameter of the inner ring body is between 222.5 and 224.6 mm.

[0011] In the above-mentioned motor hub structure for electric vehicles, eight, nine, or ten end cap connection holes are evenly distributed at both ends of the inner ring body.

[0012] A method for manufacturing a motor hub structure for an electric vehicle, the method comprising the following steps:

[0013] S1: Inner ring body manufacturing steps, manufacturing the inner ring body of the first material, the outer side of the inner ring body is provided with an embedded ring groove;

[0014] Wheel rim manufacturing steps: Manufacturing a semi-finished wheel rim using a second material, wherein the material of the wheel rim can be welded to the material of the inner ring body;

[0015] S2: Mill an inclined arc groove. Place the inner ring body into a milling machine and mill an inclined arc groove on the inner ring body to prepare for the subsequent opening of the valve hole.

[0016] S3: Extrusion molding, placing the inner ring body on the mounting base of the extruder, then fitting the semi-finished rim onto the outside of the inner ring body, and pressing the middle part of the semi-finished rim into the embedded ring groove of the inner ring body through the extruder.

[0017] S4: Welding and forming: The interconnected inner ring body and the semi-finished rim are placed into the welding machine for welding to form the semi-finished wheel hub A;

[0018] S5: Open the valve hole and send the semi-finished wheel hub A to process the valve hole to form the semi-finished wheel hub B;

[0019] S6: Wheel hub flanging: The semi-finished wheel hub B is placed into the flanging machine for flanging to form the semi-finished wheel hub C;

[0020] S7: Wheel hub precision machining: Place the semi-finished wheel hub C into the lathe and perform precision machining on the two sides and the inner side of the inner ring.

[0021] S8: Drilling and tapping the inner ring. Drill holes in the semi-finished wheel hub C after precision machining. The drilling positions are on both sides of the inner ring. After drilling, tap the holes to facilitate the connection of the cover plate.

[0022] In the above-described manufacturing method for the motor hub structure of an electric vehicle, the inner ring body in S1 is formed by rolling and welding; the semi-finished rim is also formed by rolling and welding.

[0023] The outstanding and beneficial technical effects of this invention compared to the prior art are:

[0024] This invention provides an embedded annular groove on the outer side of the inner ring body. An extrusion device forces the middle part of the rim into the embedded annular groove to form an embedded protruding ring. Finally, the two are connected by welding, which ensures a stable connection. Furthermore, because the outer side of the inner ring body has an embedded annular groove, the inner diameter of the inner ring body can be made larger after the groove mates with the rim. This allows for the accommodation of a larger hub motor, thereby increasing the motor power and overall motor strength. Attached Figure Description

[0025] Figure 1 This is a simplified structural diagram of the present invention.

[0026] Figure 2 This is a cross-sectional view of the present invention.

[0027] Figure 3 This is an enlarged view of point A in the present invention.

[0028] Figure 4 This is an exploded view of the present invention.

[0029] 1-Rim; 2-Inner ring body; 21-Embedded ring groove; 22-Embedded convex ring; 23-End cap connecting hole; 24-Air nozzle mounting hole; 25-Inclined arc groove; Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0031] like Figures 1-4 As shown: A motor hub structure for an electric vehicle includes an inner ring body 2 welded inside a rim 1. The outer side of the inner ring body 2 is provided with an embedded annular groove 21. The middle end of the rim 1 is provided with an embedded protruding ring 22 adapted to the embedded annular groove 21. The two ends of the inner ring body 2 are respectively provided with end cap connecting holes 23, and the rim 1 is provided with an air nozzle mounting hole 24. Specifically, by cooperating with the embedded annular groove on the outer side of the inner ring body and the embedded protruding ring of the inner ring body, the inner diameter of the inner ring body can be made larger, increasing the internal accommodation space. This allows for the use of a larger hub motor, increasing the motor power and the power of the electric vehicle. Furthermore, the rim and the inner ring body are connected by welding while in contact, which can further improve the strength and toughness of the hub.

[0032] In the above-mentioned motor hub structure for electric vehicles, the inner ring body 2 is provided with an inclined arc groove 25 on the side near the air nozzle mounting hole 24. Specifically, the inclined arc groove is designed to facilitate the extension of the air nozzle.

[0033] In the above-mentioned motor hub structure for electric vehicles, the cross-section of the embedded annular groove 21 is an isosceles trapezoidal structure. Specifically, this is to facilitate the compression and embedding of the middle end of the rim, thereby improving the connection stability.

[0034] In the above-mentioned motor hub structure for electric vehicles, the bottom width of the embedded annular groove 21 is between 19.3 and 21.3 mm. Specifically, the present invention preferably adopts 20.3 mm, but it can also be adjusted according to actual needs.

[0035] In the above-mentioned motor hub structure for electric vehicles, the groove depth of the embedded annular groove 21 is between 3-5mm. Specifically, the present invention preferably adopts 4mm, but it can also be adjusted according to actual needs.

[0036] In the above-mentioned motor hub structure for electric vehicles, the inner diameter of the inner ring body 2 is between 222.5 and 224.6 mm. Specifically, the present invention preferably adopts 222.5 mm, but it can also be adjusted according to actual needs.

[0037] In the above-mentioned motor hub structure for electric vehicles, eight, nine, or ten end cap connection holes 23 are evenly distributed at both ends of the inner ring body 2, which can meet the needs of different models of end caps.

[0038] A method for manufacturing a motor hub structure for an electric vehicle, the method comprising the following steps:

[0039] S1: Inner ring body manufacturing steps, manufacturing the inner ring body of the first material, the outer side of the inner ring body is provided with an embedded ring groove;

[0040] Wheel rim manufacturing steps: Manufacturing a semi-finished wheel rim using a second material, wherein the material of the wheel rim can be welded to the material of the inner ring body;

[0041] S2: Mill an inclined arc groove. Place the inner ring body into a milling machine and mill an inclined arc groove on the inner ring body to prepare for the subsequent opening of the valve hole.

[0042] S3: Extrusion molding, placing the inner ring body on the mounting base of the extruder, then fitting the semi-finished rim onto the outside of the inner ring body, and pressing the middle part of the semi-finished rim into the embedded ring groove of the inner ring body through the extruder.

[0043] S4: Welding and forming: The interconnected inner ring body and the semi-finished rim are placed into the welding machine for welding to form the semi-finished wheel hub A;

[0044] S5: Open the valve hole and send the semi-finished wheel hub A to process the valve hole to form the semi-finished wheel hub B;

[0045] S6: Wheel hub flanging: The semi-finished wheel hub B is placed into the flanging machine for flanging to form the semi-finished wheel hub C;

[0046] S7: Wheel hub precision machining: Place the semi-finished wheel hub C into the lathe and perform precision machining on the two sides and the inner side of the inner ring.

[0047] S8: Drilling and tapping the inner ring. Drill holes in the semi-finished wheel hub C after precision machining. The drilling positions are on both sides of the inner ring. After drilling, tap the holes to facilitate the connection of the cover plate.

[0048] In the above-described manufacturing method for the motor hub structure of an electric vehicle, the inner ring body in S1 is formed by rolling and welding; the semi-finished rim is also formed by rolling and welding. Specifically, both the inner ring body and the semi-finished rim are existing technologies.

[0049] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A motor hub structure for an electric vehicle, comprising an inner ring body (2) welded within a rim (1), characterized in that: The outer side of the inner ring body (2) is provided with an embedded ring groove (21), and the middle end of the rim (1) is provided with an embedded protruding ring (22) that is adapted to the embedded ring groove (21). The two ends of the inner ring body (2) are respectively provided with end cap connecting holes (23), and the rim (1) is provided with an air nozzle mounting hole (24).

2. The motor hub structure for electric vehicles according to claim 1, characterized in that: An inclined arc groove (25) is provided on the side of the inner ring body (2) near the air nozzle mounting hole (24).

3. The motor hub structure for electric vehicles according to claim 1 or 2, characterized in that: The cross-section of the embedded annular groove (21) is an isosceles trapezoidal structure.

4. The motor hub structure for electric vehicles according to claim 3, characterized in that: The bottom width of the embedded annular groove (21) is between 19.3 and 21.3 mm.

5. The motor hub structure for electric vehicles according to claim 4, characterized in that: The groove depth of the embedded annular groove (21) is between 3 and 5 mm.

6. The motor hub structure for electric vehicles according to claim 3, characterized in that: The inner diameter of the inner ring body (2) is between 222.5 and 224.6 mm.

7. The motor hub structure for electric vehicles according to claim 1, 3, 4, 5, or 6, characterized in that: The inner ring body (2) has eight, nine or ten end cap connection holes (23) evenly distributed at both ends.

8. A method for manufacturing a motor hub structure for an electric vehicle, characterized in that, The manufacturing method includes the following steps: S1: Inner ring body manufacturing steps, manufacturing the inner ring body of the first material, the outer side of the inner ring body is provided with an embedded ring groove; Wheel rim manufacturing steps: Manufacturing a semi-finished wheel rim using a second material, wherein the material of the wheel rim can be welded to the material of the inner ring body; S2: Mill an inclined arc groove. Place the inner ring body into a milling machine and mill an inclined arc groove on the inner ring body to prepare for the subsequent opening of the valve hole. S3: Extrusion molding, placing the inner ring body on the mounting base of the extruder, then fitting the semi-finished rim onto the outside of the inner ring body, and pressing the middle part of the semi-finished rim into the embedded ring groove of the inner ring body through the extruder. S4: Welding and forming: The interconnected inner ring body and the semi-finished rim are placed into the welding machine for welding to form the semi-finished wheel hub A; S5: Open the valve hole and send the semi-finished wheel hub A to process the valve hole to form the semi-finished wheel hub B; S6: Wheel hub flanging: The semi-finished wheel hub B is placed into the flanging machine for flanging to form the semi-finished wheel hub C; S7: Wheel hub precision machining: Place the semi-finished wheel hub C into the lathe and perform precision machining on the two sides and the inner side of the inner ring. S8: Drilling and tapping the inner ring. Drill holes in the semi-finished wheel hub C after precision machining. The drilling positions are on both sides of the inner ring. After drilling, tap the holes to facilitate the connection of the cover plate.

9. The motor hub structure for an electric vehicle according to claim 8, characterized in that: The inner ring body in S1 is formed by rolling and welding; the semi-finished wheel rim is also formed by rolling and welding.

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