Bilateral hub motor

Abstract

The utility model provides a bilateral hub motor, and belongs to the technical field of motors. The problems that an existing hub motor is low in assembly efficiency and inconvenient to maintain subsequently are solved. The bilateral hub motor comprises a casing, a hub sleeved outside the casing and a support shaft penetrating through the casing, two ends of the support shaft are positioned outside the casing, a driving component is arranged in the casing, the casing comprises a shell with an opening on one side, a second retaining cover for covering the opening on one side of the shell is detachably connected onto the shell, the inner side of the second retaining cover is abutted against the shell, and the second retaining cover is detachably connected onto the casing. The hub is provided with a blocking edge abutting against the inner side of the second blocking cover, the blocking edge is connected with the second blocking cover through a fastener, and a gap is formed between the outer edge of the second blocking cover and the inner surface of the hub. The bilateral hub motor has the advantages of improving the assembly efficiency and the subsequent maintenance convenience.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors and relates to a double-sided hub motor. Background Art

[0002] The biggest feature of the hub motor is that the drive device is integrated into the wheel hub, and the wheel is designed as an integrated whole, omitting the transmission system. The driving force acts directly on the wheel. Vehicles driven by the hub motor can achieve higher space utilization and transmission efficiency.

[0003] Existing hub motors, such as those disclosed in Chinese patent literature (Patent No. 201520983914.4), include a hub motor for an automobile and a vehicle using the same. These motors include a shaft, a hub motor stator, and a hub motor rotor. The hub motor stator is secured to the shaft, and the hub motor rotor is mounted on the exterior of the hub motor stator and is rotatable about the stator. Existing hub structures for electric vehicles, such as those disclosed in Chinese patent literature (Patent No. 202220085082.4), include a hub structure comprising a rim, a wheel ring, and a housing. The housing has an open end and a closed end. A motor cavity is defined within the housing. The wheel ring is connected to the opening of the housing and is disposed on the exterior of the housing and the wheel ring. The housing has a motor center hole located on the central axis of the housing. In order to integrate the hub motor into the wheel hub, the stator of the existing hub motor is fixedly connected to the outer shell of the wheel hub. It can be seen that after the drive device is integrated into the wheel hub, the hub motor uses the inner ring of the wheel hub as the shell.

[0004] Because the driving components are installed in the shell of the hub motor, and the wheel hub is the skeleton that supports the tire and has a large shape, the hub motor uses the inner ring of the wheel hub as the shell, which can easily lead to the problem of inconvenience in assembling the hub motor and cause low assembly efficiency during the production of the hub motor; furthermore, the tires of the vehicle will continue to wear as the vehicle travels. When the tires need to be replaced or maintained, the connection between the hub motor and the vehicle needs to be removed when the wheel hub is removed. When the hub motor fails, the tire also needs to be removed, which makes the subsequent maintenance of the hub motor inconvenient. Summary of the Invention

[0005] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to propose a bilateral hub motor, the technical problem to be solved is how to improve the assembly efficiency of the hub motor and at the same time improve the convenience of subsequent maintenance.

[0006] The purpose of this utility model can be achieved through the following technical solutions:

[0007] A bilateral hub motor comprises a casing, a hub sleeved outside the casing, and a support shaft passed through the casing, both ends of the support shaft are located outside the casing, a drive assembly is provided in the casing, the casing comprises a shell having an opening on one side, a second stop cover detachably connected to the shell covering the opening on one side thereof, the inner side of the second stop cover abuts against the shell, and is characterized in that the hub has a stop edge abutting against the inner side of the second stop cover, the stop edge is connected to the second stop cover by a fastener, and there is a gap between the outer edge of the second stop cover and the inner surface of the hub.

[0008] In the present application, the wheel hub and the shell are of a split structure. The wheel hub can be removed from the shell by loosening the fasteners connecting the stop edge and the second stop cover. The wheel hub is the skeleton that supports the tire. Its size is large, and the shell is smaller than the wheel hub. When assembling the wheel hub motor, the drive assembly is first installed in the shell, and then the wheel hub is installed outside the shell, so that the assembler only needs to operate on the shell when installing the drive assembly, and will not be restricted by the structure of the wheel hub. This structure facilitates the installation of the drive assembly to improve the assembly efficiency of the wheel hub motor. After the drive assembly is installed, the second stop cover is installed on the shell to cover the opening on one side of the shell. By A gap is provided between the second stop cover and the inner wall of the wheel hub to prevent interference between the second stop cover and the wheel hub and facilitate position adjustment during installation of the second stop cover. This structure reduces manufacturing precision while further improving the assembly efficiency of the hub motor. Furthermore, the tire mounted on the wheel hub is a consumable part. When the tire needs to be replaced due to wear, the hub can be removed from the housing by removing the fasteners using a conventional disassembly tool. When the hub is reinstalled, the hub is re-sleeved outside the housing, and the stop edge of the hub is then abutted against the inner side of the second stop cover. The two are then fastened together using fasteners to complete the installation of the tire or hub after repair. The inner side of the second stop cover abuts against the housing, and the hub abuts against the inner side of the second stop cover. This is equivalent to the housing using the side of the housing as a reference for assembly through the second stop cover, so that the relative position of the two is determined, eliminating the need to calibrate the installation of the hub on the housing. This further improves the assembly efficiency of the hub motor and enhances the convenience of subsequent maintenance.

[0009] In the aforementioned bilateral in-wheel hub motor, the housing is cylindrical and has openings on both sides. The second cover covers the right opening of the housing, and the first cover is detachably connected to the housing to cover the left opening. When assembling the in-wheel hub motor, the cylindrical housing provides more operating space for installing the drive assembly, facilitating assembly. After assembly of the drive assembly is complete, the first and second covers are installed on either side of the housing to cover the left and right openings.

[0010] In the aforementioned bilateral hub motor, the retaining edge is annular and projects from the inner wall of the wheel hub along the axial direction of the housing toward the second retaining cover. The inner wall of the retaining edge abuts against the outer wall of the housing. This structure allows the retaining edge to function as part of the inner wall of the wheel hub. The annular retaining edge structure increases the contact area between the wheel hub and the second retaining cover, and between the wheel hub and the housing, allowing the inner wall of the wheel hub to abut against the outer wall of the housing and the second retaining cover, thereby improving the stability of the connection between the wheel hub and the second retaining cover.

[0011] In the aforementioned bilateral in-wheel hub motor, the first cover is disc-shaped, and its outer diameter is smaller than the minimum inner diameter of the wheel hub. By setting the outer diameter of the first cover, when the wheel hub needs to be disassembled, the wheel hub can be removed from the left side of the housing by loosening the fasteners connecting the retaining edge and the second cover. This structure not only prevents interference between the first cover and the wheel hub, but also allows the wheel hub to be removed from the housing without removing the second cover, thereby improving the maintenance convenience of the in-wheel hub motor.

[0012] In the aforementioned bilateral hub motor, one side of the first stop cover and one side of the second stop cover each have abutment surfaces against the housing, each of which has an annular embedded portion. Both embedded portions are located within the housing, and a gap is provided between the outer wall of the embedded portion and the inner wall of the housing. When the first and second stop covers need to be installed on the housing, the embedded portions are first embedded into the housing to perform an initial positioning of the first and second stop covers on the housing, facilitating subsequent connection of the first and second stop covers to the housing. The provision of the gap reduces the machining accuracy of the embedded portions and prevents interference between the embedded portions and the housing, thereby further improving the assembly efficiency of the hub motor.

[0013] In the aforementioned double-sided in-wheel hub motor, the second cover is disc-shaped, and a plurality of mounting slots are defined along its edge, extending through the side of the cover facing away from the housing. The mounting slots are spaced apart around the circumference of the cover. The mounting slots accommodate the heads of the fasteners, preventing them from protruding relative to the cover after installation. The mounting slots are arranged around the circumference of the cover, allowing the fasteners to be connected to the housing around the circumference of the cover, thereby improving the stability of the connection between the cover and the housing.

[0014] In the aforementioned bilateral hub motor, the right side of the housing is provided with a plurality of first mounting holes for mounting a first cover, and the left side of the housing is provided with a plurality of second mounting holes for mounting a second cover. The first mounting holes and the second mounting holes are spaced apart around the circumference of the housing, and the axes of the first mounting holes and the second mounting holes are staggered. The first mounting holes ensure a stable connection between the first cover and the housing, while the second mounting holes ensure a stable connection between the second cover and the housing. By staggering the axes of the first and second mounting holes, the structural strength of the housing is maintained, while the housing structure is made compact.

[0015] In the aforementioned double-sided in-wheel motor, the second cover is provided with a through-hole corresponding to each of the second mounting holes, and the through-hole is located between two adjacent mounting slots. This structure ensures the stability of the connection between the second cover, the wheel hub, and the housing, and further improves the relative positional relationship between the wheel hub and the housing.

[0016] In the aforementioned bilateral hub motor, a center hole is defined in the center of each of the first and second stop covers. The support shaft is inserted through the two center holes. The middle portions of the first and second stop covers each have a raised portion extending away from the housing. Bearings mounted on the support shaft are secured within the raised portions. The ends of the support shaft extend out of the housing through the first and second stop covers. The placement of the bearings within the raised portions makes the housing compact, preventing the bearings from occupying space within the housing while also improving support for the support shaft.

[0017] In the aforementioned double-sided in-wheel motor, the drive assembly includes a stator located within a housing and a rotor disposed around the stator. The stator is fixedly connected to a support shaft, and the rotor is fixedly connected to the inner wall of the housing. The rotor comprises a plurality of magnetic steel sheets. Given the cylindrical structure of the housing, the magnetic steel sheets are spaced along the inner wall of the housing. With the stator positioned within the housing, the rotor can be disposed around the stator.

[0018] Compared with the prior art, the double-sided hub motor provided by the present invention has the following advantages:

[0019] 1. The wheel hub and the hub motor housing are set into a split structure. The housing is small in size, and the annular structure of the housing provides more operating space for the installation of the drive component, allowing assemblers to operate the installation of the drive component on both sides of the housing at the same time, thereby improving the assembly efficiency of the hub motor. The split structure also improves the convenience of subsequent maintenance of the hub motor.

[0020] 2. Use the side of the second blocking cover that closes the right opening of the shell as the position reference of the wheel hub on the shell. Press the blocking edge against the side of the second blocking cover to determine the relative position relationship between the wheel hub and the shell, thereby further improving the assembly efficiency of the hub motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of the bilateral hub motor.

[0022] Figure 2 yes Figure 1 main view.

[0023] Figure 3 yes Figure 2 Cross-sectional view at AA.

[0024] Figure 4 yes Figure 3 Enlarged view of point A.

[0025] Figure 5 yes Figure 2 Cross-sectional view at BB.

[0026] Figure 6 yes Figure 5 Enlarged view of point B.

[0027] Figure 7 yes Figure 2 Cross-sectional view at CC.

[0028] Figure 8 yes Figure 7 Enlarged view of point C.

[0029] Figure 9 Exploded diagram of this double-sided hub motor.

[0030] In the figure, 1. casing; 11. shell; 111. first mounting hole; 112. second mounting hole; 12. first stop cover; 13. second stop cover; 131. mounting groove; 132. through hole; 14. abutment surface; 15. embedded portion; 16. center hole; 17. raised portion; 2. wheel hub; 21. stop edge; 3. support shaft; 4. drive assembly; 41. stator; 42. rotor; 5. fastener; 6. bearing. DETAILED DESCRIPTION

[0031] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0032] like Figure 1 and Figure 9As shown, the double-sided hub motor comprises a housing 1, a hub 2 sleeved outside the housing 1, and a support shaft 3 passing through the housing 1. Both ends of the support shaft 3 are located outside the housing 1. Figures 2 to 8 As shown, a drive assembly 4 is provided in the casing 1, and the casing 1 includes a shell 11 which is cylindrical and opened on both sides. A first stop cover 12 covering the left opening is detachably connected to the left side of the shell 11, and a second stop cover 13 covering the right opening is detachably connected to the right side of the shell 11. The inner side of the second stop cover 13 abuts against the shell 11, and the hub 2 has a stop edge 21 abutting against the inner side of the second stop cover 13. The stop edge 21 is annular, and the stop edge 21 protrudes from the inner wall of the wheel hub 2 along the axial direction of the shell 11 toward the second stop cover 13. The inner wall of the stop edge 21 abuts against the outer wall of the shell 11, and the stop edge 21 is connected to the second stop cover 13 by a fastener 5.

[0033] like Figures 2 to 8 As shown, the first stopper 12 and the second stopper 13 are both disc-shaped. The outer diameter of the first stopper 12 is smaller than the minimum inner diameter of the wheel hub 2, and there is a gap between the second stopper 13 and the inner wall of the wheel hub 2. One side of the first stopper 12 and one side of the second stopper 13 both have abutting surfaces 14 that abut against the housing 11. The abutting surfaces 14 have an annular embedded portion 15. Both embedded portions 15 are located inside the housing 11, and there is a gap between the outer wall of the embedded portion 15 and the inner wall of the housing 11. Figure 2 and Figure 9 As shown, the edge of the second stop cover 13 is provided with a plurality of mounting grooves 131 penetrating the side of the second stop cover 13 away from the housing 11. The mounting grooves 131 are arranged at intervals around the circumference of the second stop cover 13. Figure 3 As shown, a third mounting hole is opened at the bottom of the mounting groove 131 , the head of the fastener 5 is located in the mounting groove 131 , and the rod of the fastener 5 passes through the third mounting hole and is connected to the retaining edge 21 so that the second cover 13 is connected to the wheel hub 2 .

[0034] like Figure 7 and Figure 8 As shown, the left side of the housing 11 is provided with a plurality of second mounting holes 112 for mounting the second blocking cover 13. Figure 5 and Figure 6 As shown, the right side of the housing 11 defines a plurality of first mounting holes 111 for mounting the first blocking cover 12. The first mounting holes 111 and the second mounting holes 112 are spaced apart around the circumference of the housing 11, and the axes of the first mounting holes 111 and the second mounting holes 112 are staggered. The second blocking cover 13 defines through holes 132 corresponding one-to-one with the second mounting holes 112. In this embodiment, the through holes 132 are countersunk holes and are located between two adjacent mounting slots 131.

[0035] A central hole 16 is formed in the center of each of the first and second stopper covers 12, 13. The support shaft 3 is inserted through the two central holes 16. A raised portion 17, which rises away from the housing 11, is formed in the middle of each of the first and second stopper covers 12, 13. A bearing 6, which is sleeved on the support shaft 3, is fixed in the raised portion 17. The drive assembly 4 includes a stator 41 located within the housing 11 and a rotor 42 disposed around the stator 41. The stator 41 is fixedly connected to the support shaft 3, and the rotor 42 is fixedly connected to the inner wall of the housing 11.

[0036] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0037] Although this document frequently uses terms such as housing 1, shell 11, first mounting hole 111, second mounting hole 112, first cover 12, second cover 13, mounting groove 131, through hole 132, abutment surface 14, embedded portion 15, center hole 16, raised portion 17, hub 2, retaining edge 21, support shaft 3, drive assembly 4, stator 41, rotor 42, fastener 5, and bearing 6, the use of other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A double-sided wheel hub motor, comprising a housing (1), a wheel hub (2) sleeved outside the housing (1), and a support shaft (3) passing through the housing (1), both ends of the support shaft (3) being located outside the housing (1), a drive assembly (4) being arranged inside the housing (1), the housing (1) comprising a shell (11) having an opening on one side, a second blocking cover (13) for covering the opening on one side being detachably connected to the housing (11), the inner side of the second blocking cover (13) being in contact with the housing (11), and characterized in that: The wheel hub (2) has a stop edge (21) that abuts against the inner side of the second stop cover (13); the stop edge (21) is connected to the second stop cover (13) via a fastener (5); and a gap is provided between the outer edge of the second stop cover (13) and the inner surface of the wheel hub (2).

2. The double-sided wheel hub motor according to claim 1, characterized in that: The shell (11) is cylindrical and has openings on both sides of the shell (11); the second blocking cover (13) covers the opening on the right side of the shell (11); and the shell (11) is detachably connected to a first blocking cover (12) that covers the opening on the left side.

3. The double-sided wheel hub motor according to claim 1 or 2, characterized in that: The retaining edge (21) is annular and protrudes from the inner wall of the wheel hub (2) along the axial direction of the shell (11) toward the second retaining cover (13), and the inner wall of the retaining edge (21) abuts against the outer wall of the shell (11).

4. The double-sided hub motor according to claim 2, characterized in that: The first stop cover (12) is in the shape of a disk, and the outer diameter of the first stop cover (12) is smaller than the minimum inner diameter of the wheel hub (2).

5. The double-sided wheel hub motor according to claim 2 or 4, characterized in that: One side of the first blocking cover (12) and one side of the second blocking cover (13) both have abutting surfaces (14) that abut against the shell (11), and the abutting surfaces (14) have an annular embedded portion (15), and the two embedded portions (15) are both located in the shell (11), and there is a gap between the outer wall of the embedded portion (15) and the inner wall of the shell (11).

6. The double-sided wheel hub motor according to claim 2 or 4, characterized in that: The second stop cover (13) is disc-shaped, and a plurality of mounting grooves (131) are provided on the edge of the second stop cover (13) and penetrate the side of the second stop cover (13) away from the housing (11). The mounting grooves (131) are arranged at intervals around the circumference of the second stop cover (13).

7. The double-sided wheel hub motor according to claim 6, characterized in that: The right side of the shell (11) is provided with a plurality of first mounting holes (111) for mounting a first blocking cover (12), and the left side of the shell (11) is provided with a plurality of second mounting holes (112) for mounting a second blocking cover (13), the first mounting holes (111) and the second mounting holes (112) are both arranged at intervals around the circumference of the shell (11), and the axis of the first mounting hole (111) and the axis of the second mounting hole (112) are arranged to be staggered.

8. The double-sided wheel hub motor according to claim 7, characterized in that: The second blocking cover (13) is provided with through holes (132) corresponding one to one with the second mounting holes (112), and the through holes (132) are located between two adjacent mounting grooves (131).

9. The double-sided wheel hub motor according to claim 2 or 4, characterized in that: A center hole (16) is provided at the center of the first stop cover (12) and the center of the second stop cover (13), and the support shaft (3) is inserted into the two center holes (16). The middle of the first stop cover (12) and the middle of the second stop cover (13) both have a raised portion (17) raised in a direction away from the housing (11), and a bearing (6) sleeved on the support shaft (3) is fixed in the raised portion (17).

10. The double-sided hub motor according to claim 1, 2 or 4, characterized in that: The driving assembly (4) comprises a stator (41) located in a housing (11) and a rotor (42) arranged around the stator (41); the stator (41) is fixedly connected to the support shaft (3); and the rotor (42) is fixedly connected to the inner wall of the housing (11).

Images