Small wheel hub motor driving system

Abstract

The utility model provides a small wheel hub motor driving system. The small wheel hub motor driving system comprises a left casing assembly, a stator assembly and a rotor assembly, the left machine shell assembly comprises a left machine shell made of plastic, and an inner gear ring is integrally formed on the inner side of the left machine shell. The stator assembly comprises a stator support, a stator assembly and a planetary gear, the stator assembly is connected to one side of the stator support, and the other side of the stator support serves as a planetary support to be connected with the planetary gear. The rotor assembly comprises a rotor support and a sun gear, the rotor support is connected with a rotor, the sun gear is connected with the rotor support, the rotor is meshed with a planetary gear through the sun gear, and the planetary gear is meshed with the inner gear ring.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a small hub motor drive system. Background Technology

[0002] Patent document CN216139808U discloses a hub motor side cover, a hub motor side cover with brake components, and a hub motor. The cover includes a cover end face and an annular cover wall connected to the edge of the cover end face, with a casting through hole on the cover end face. A drum brake cup or disc brake mounting seat with an axle mounting portion is cast from aluminum or aluminum alloy into the casting through hole of the hub motor side cover. The hub motor is then further constructed by welding the hub motor side cover with brake components to an iron wheel rim. As mentioned in the patent document, existing hub motors mostly use aluminum metal shells. Motors with aluminum shells require a metal gear ring in their planetary gear reduction mechanism, further increasing the overall weight of the motor. While aluminum shells are robust, they increase weight, failing to meet the current market demand for small, lightweight hub motors. Furthermore, their transmission systems mostly use planetary gear reduction mechanisms to achieve a large reduction ratio; however, planetary gear reduction mechanisms typically occupy a large space, making it difficult to miniaturize the motor. Utility Model Content

[0003] In view of the deficiencies in the existing technology, the purpose of this utility model is to provide a small hub motor drive system.

[0004] A small hub motor drive system according to the present invention includes: a left housing assembly 100, a stator assembly 102 and a rotor assembly 103;

[0005] The left housing assembly 100 includes a left housing 6 made of plastic, and an internal gear ring is integrally formed on the inner side of the left housing 6.

[0006] The stator assembly 102 includes a stator support 16, a stator assembly 12, and a planetary gear 7. The stator assembly 12 is connected to one side of the stator support 16, and the other side of the stator support 16 serves as a planetary support to connect the planetary gear 7.

[0007] The rotor assembly 103 includes a rotor support 9 and a sun gear 14. The rotor support 9 is connected to the rotor, and the sun gear 14 is connected to the rotor support 9. The rotor meshes with the planetary gear 7 through the sun gear 14, and the planetary gear 7 meshes with the internal gear ring.

[0008] Furthermore, it also includes a right housing assembly 104, which includes a right housing 10 and is connected to the left housing 6.

[0009] Furthermore, the sun gear 14 is connected to the stator support 16 via the third bearing 18, and to the right housing 10 via the second bearing 13.

[0010] Furthermore, it also includes a lead wire assembly 101, which includes a lead wire 2 and a motor lead wire 1. The end of the lead wire 2 is coaxially connected to the stator assembly 102 and connected to the left housing 6 through a first bearing 4. The motor lead wire 1 passes through the lead wire 2 and is separated from the sun gear 14 by a wire clamp to prevent interference.

[0011] Furthermore, a Hall plate 8 is connected to the stator support 16, the three-phase wires of the stator assembly 102 are welded to the Hall plate 8, and one end of the motor lead wire 1 is electrically connected to the Hall plate 8 through a connector.

[0012] Furthermore, the first bearing 4 is a waterproof bearing.

[0013] Furthermore, a first O-ring 17 is connected between the first bearing 4 and the outlet shaft 2.

[0014] Furthermore, a skeleton oil seal 3 is connected between the outlet shaft 2 and the left housing 6.

[0015] Furthermore, the lead wire assembly 101 also includes a wire clip 5, through which the motor lead wire 1 is fixed inside the lead wire 2 to prevent the motor lead wire from interfering with the sun gear 14.

[0016] Furthermore, a glue groove is provided at the connection between the left housing 6 and the right housing 10, and the glue groove is filled with sealant.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] To reduce weight, the housing of this invention is made of plastic. When the housing is made of plastic, the internal gear ring can be made as a single unit with the housing. In this design, the internal gear ring and the left housing are integrally injection molded, which significantly reduces the weight compared to an aluminum housing and an iron internal gear ring. The BOSS pillar of the left housing is positioned far away from the internal gear ring, which can reduce the impact of material shrinkage on the internal gear ring, improve gear precision, and reduce overall machine noise.

[0019] In this invention, the planetary support and stator support are integrated into a single unit. The left half, consisting of planetary pins, is used to secure the planetary gears, while the right half is used to secure the stator assembly. The sun gear is directly press-fitted onto the rotor support, resulting in a more compact structure and smaller size. Attached Figure Description

[0020] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0021] Figure 1 This is a cross-sectional view of the present invention;

[0022] Figure 2 This is a schematic diagram of the Hall plate structure;

[0023] Figure 3 This is an exploded view of the present invention;

[0024] Figure 4 This is a partial enlarged view of the waterproof structure of this utility model;

[0025] Figure 5 This is a schematic diagram of one possible cable exit method of this utility model;

[0026] Figure 6 This is a schematic diagram of another wiring method of this utility model. Detailed Implementation

[0027] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0028] like Figure 1 and Figure 3 As shown, the present invention provides a small hub motor drive system, comprising four parts: a left housing assembly 100, a lead shaft assembly 101, a stator assembly 102, a rotor assembly 103, and a right housing assembly 104.

[0029] The left housing assembly 100 includes a left housing 6 made of plastic. The inner side of the left housing 6 has an internal gear ring integrally formed. It can be integrally formed by injection molding. Compared with aluminum housing and iron internal gear ring, plastic housing greatly reduces the overall weight. Furthermore, combining the left housing and internal gear ring reduces the number of parts and simplifies the process.

[0030] The stator assembly 102 includes a stator support 16, a stator assembly 12, and planetary gears 7. The stator assembly 12 is connected to one side of the stator support 16, and the other side of the stator support 16 serves as a planetary support connecting to the planetary gears 7. A Hall plate 8 is connected to the stator support 16. The three-phase wires of the stator assembly 102 are soldered to the Hall plate 8, and one end of the motor lead 1 is electrically connected to the Hall plate 8 via a connector. The motor Hall effect sensors adopt a surface-mount layout, and the motor lead 1 is connected to the Hall plate 8 via connectors, abandoning the traditional soldering method for easier operation. The three-phase wires of the motor lead 1 are soldered to the three-phase wires of the winding via the Hall plate, and corresponding solder points are connected by copper plating. Figure 2 The motor lead wire three-phase wire connectors and winding three-phase wire connectors only need to be soldered to the corresponding positions on the Hall plate. This can avoid problems such as excessively large joint solder points caused by direct welding of the three-phase wires, resulting in insufficient space and inconvenient operation.

[0031] The rotor assembly 103 includes a rotor support 9, magnets 11, and a sun gear 14. The rotor support 9 is connected to the rotor, and the sun gear 14 is connected to the rotor support 9. The rotor meshes with planetary gears 7 through the sun gear 14, and the planetary gears 7 mesh with an internal gear ring. The sun gear 14 is connected to the stator support 16 through a third bearing 18 and to the right housing 10 through a second bearing 13.

[0032] The lead wire assembly 101 includes a lead wire 2, a wire clip 5, and a motor lead wire 1. The end of the lead wire 2 is coaxially connected to the stator assembly 102 and connected to the left housing 6 via a first bearing 4. The motor lead wire 1 passes through the lead wire 2. Figure 4 As shown, the first bearing 4 is preferably a waterproof bearing, and a first O-ring 17 is connected between the first bearing 4 and the lead-out shaft 2 to achieve double waterproofing. A skeleton oil seal 3 is connected between the lead-out shaft 2 and the left housing 6. Figure 5 , Figure 6 As shown, the cable exit shaft can accommodate both center-mounted and side-mounted cable exit methods. The cable exit shaft 2 employs both center-mounted and side-mounted drilling methods. When center-mounted cable exit is required, the cable is threaded through the center hole; when side-mounted cable exit is required, the cable is threaded through the side hole. The motor lead wire 1 is secured with a cable clip 5 to prevent it from entering the planetary gear 7 area during motor operation and affecting normal motor operation.

[0033] The right housing assembly 104 includes a right housing 10, which is connected to the left housing 6. A glue groove is provided at the connection between the left housing 6 and the right housing 10, and the glue groove is filled with sealant.

[0034] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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 application.

[0035] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A small hub motor drive system, characterized in that, include: Left housing assembly (100), stator assembly (102) and rotor assembly (103); The left housing assembly (100) includes a left housing (6) made of plastic, and an internal gear ring is integrally formed on the inner side of the left housing (6). The stator assembly (102) includes a stator support (16), a stator assembly (12), and a planetary gear (7). The stator assembly (12) is connected to one side of the stator support (16), and the other side of the stator support (16) serves as a planetary support to connect the planetary gear (7). The rotor assembly (103) includes a rotor support (9), a magnet (11), and a sun gear (14). The rotor support (9) is connected to the rotor, and the sun gear (14) is connected to the rotor support (9). The rotor meshes with the planetary gear (7) through the sun gear (14), and the planetary gear (7) meshes with the internal gear ring.

2. The small hub motor drive system according to claim 1, characterized in that, It also includes a right housing assembly (104), which includes a right housing (10) connected to the left housing (6).

3. The small hub motor drive system according to claim 2, characterized in that, The sun gear (14) is connected to the stator support (16) via the third bearing (18) and to the right housing (10) via the second bearing (13).

4. The small hub motor drive system according to claim 1, characterized in that, It also includes a lead wire assembly (101), which includes a lead wire (2), a wire clip (5) and a motor lead wire (1). The end of the lead wire (2) is coaxially connected to the stator assembly (102) and connected to the left housing (6) through a first bearing (4). The motor lead wire (1) passes through the lead wire (2).

5. The small hub motor drive system according to claim 4, characterized in that, A Hall plate (8) is connected to the stator bracket (16), the three-phase wires of the stator assembly (102) are welded to the Hall plate (8), and one end of the motor lead wire (1) is electrically connected to the Hall plate (8) through a connector.

6. The small hub motor drive system according to claim 4, characterized in that, The first bearing (4) is a waterproof bearing.

7. The small hub motor drive system according to claim 4, characterized in that, A first O-ring (17) is connected between the first bearing (4) and the outlet shaft (2).

8. The small hub motor drive system according to claim 4, characterized in that, A skeleton oil seal (3) connects the outlet shaft (2) to the left housing (6).

9. The small hub motor drive system according to claim 4, characterized in that, The lead shaft assembly (101) also includes a wire clip (5), through which the motor lead wire (1) is fixed inside the lead shaft (2).

10. The small hub motor drive system according to claim 2, characterized in that, A glue groove is provided at the connection between the left housing (6) and the right housing (10), and the glue groove is filled with sealant.

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