Planetary gear set reduction hub motor

Abstract

This invention provides a planetary gear reducer hub motor, comprising a hub and a rotor mechanism. The hub has a first circumferential surface, and a planetary reduction assembly and a support base are disposed within the hub. The planetary reduction assembly includes a sun gear and several planetary gears, which mesh with the sun gear and are arranged around the sun gear. Toothed surfaces are provided on the inner wall surrounding the hub, meshing with the planetary gears. The rotor mechanism and the planetary reduction assembly are respectively mounted on both sides of the support base. This application adopts a planetary reduction structure, eliminating multi-stage gear transmission, significantly improving transmission efficiency, reducing energy consumption, and enhancing overall stability and user experience. Simultaneously, a single support base supports both the rotor mechanism and the planetary reduction assembly, making the structure more compact, axially thinner, and maximizing space utilization, facilitating lightweight and miniaturized design. It features high integration, cost advantages, fewer assembly steps, good consistency, and plug-and-play functionality.

Description

Technical Field

[0001] This invention relates to the field of electric motors, and more specifically to a planetary gear reducer hub motor. Background Technology

[0002] In-wheel motors are a type of motor technology that integrates the powertrain, transmission, and braking functions within the wheel. This technology offers advantages such as simplified vehicle structure, improved transmission efficiency, and support for multiple drive modes (e.g., front-wheel drive, four-wheel drive) and differential steering. In the field of new energy vehicles, in-wheel motors are compatible with various models, including pure electric and range-extended electric vehicles.

[0003] Existing hub motors use multi-stage reduction transmission, which results in meshing friction losses, leading to low efficiency, high temperature, and high noise. They also have complex structures and high maintenance costs. In addition, they have a large number of parts, complex assembly processes, and difficulty in ensuring gear meshing clearance and concentricity, resulting in poor mass production consistency and cumbersome disassembly and assembly for later maintenance. Summary of the Invention

[0004] To address the aforementioned problems, this application provides a planetary gear reducer hub motor, comprising a hub and a rotor mechanism. The hub has a first circumferential surface for contacting the ground. A planetary reduction assembly and a support base are disposed within the hub. The planetary reduction assembly includes a sun gear and a plurality of planetary gears, which mesh with the sun gear and are arranged around the sun gear. Toothed surfaces are provided around the inner wall of the hub, meshing with the planetary gears. The rotor mechanism and the planetary reduction assembly are respectively mounted on both sides of the support base. The rotor mechanism drives the planetary reduction assembly to rotate the first circumferential surface.

[0005] Furthermore, the rotor mechanism includes a rotor assembly and a stator assembly. The stator assembly includes a stator ring with toothed crowns extending outward along the outer circumference of the stator ring. The toothed crowns are used to wind coils and divide the outer circumference of the motor stator into several toothed slots. Tooth poles are provided at the ends of the toothed crowns. The rotor assembly includes a rotor ring surrounding the stator ring. Several permanent magnets are embedded in the outer wall of the rotor ring, and a rotating shaft is fixed inside the rotor ring.

[0006] Furthermore, the support base includes a support plate, with a sleeve and a support rod respectively provided on both sides of the support plate. The sleeve and the support rod are perpendicular to each other with the support plate. The rotating shaft is located inside the sleeve and passes through the support plate. The sun gear and the planetary gear are respectively sleeved on the rotating shaft and the support rod.

[0007] Furthermore, an end cap is wrapped around the rotor mechanism, and a pressing ring extends from the side of the end cap toward the hub, which can be inserted into the hub. A supporting step extends outward from the edge of the support plate, and a limiting step is provided around the inner wall of the hub. A limiting ring is provided around the outside of the support plate, and one side of the limiting ring is aligned with the limiting step. When the end cap is inserted into the hub, the pressing ring presses against the other side of the limiting ring, and the support plate is supported on the limiting ring by the supporting step.

[0008] Furthermore, the planetary gear includes a first gear and a second gear fixedly connected vertically, the first gear meshing with the sun gear, and the second gear meshing with the tooth surface.

[0009] Furthermore, the rotor mechanism is disposed on one side of the support plate, and a hollow fixing seat is disposed on the other side of the support plate. The fixing seat is sleeved in the hub. The fixing seat includes a seat body, and a hollow fixing plate is disposed on the side of the seat body facing the support plate. One end of the support plate is connected to the support plate, and the other end is fixed to the fixing plate.

[0010] Furthermore, a control circuit board is provided on the side of the support plate away from the support rod. The control circuit board is electrically connected to the coil winding. A conductive wire is provided outside the hub. The conductive wire passes through the hollow fixing seat and through the support plate to connect with the control circuit board.

[0011] Furthermore, the sleeve is inserted between the stator ring and the rotor ring, and a protrusion extends along the axial direction of the sleeve. A first groove is provided on the inner wall of the stator ring to cooperate with the protrusion. When the sleeve is inserted between the stator ring and the rotor ring, the protrusion is embedded in the first groove.

[0012] Furthermore, a second groove is provided on the inner wall of the stator ring, and the second groove is spaced apart from the first groove.

[0013] Compared with the prior art, the beneficial effects of the present invention are: This application employs a planetary reduction gear structure, eliminating multi-stage gear transmission, significantly improving transmission efficiency, reducing energy consumption, extending battery life with the same amount of electricity, minimizing temperature rise, and enhancing overall stability and user experience. Simultaneously, a single support base supports the rotor mechanism and planetary reduction gear assembly, resulting in a more compact structure, thinner axial profile, and higher space utilization, facilitating lightweight and miniaturized design. High integration leads to cost advantages, fewer assembly steps, better consistency, and plug-and-play functionality, effectively shortening the overall machine development cycle and improving mass production yield.

[0014] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is an exploded view of the overall structure of the present invention; Figure 2 This is a schematic diagram of the rotor mechanism of the present invention; Figure 3 This is a schematic diagram of the support base of the present invention; Figure 4 This is a schematic diagram of the hub structure of the present invention; Figure 5 This is a schematic diagram of the planetary gear structure of the present invention; Figure 6 This is a schematic diagram of the structure of the fixing base of the present invention; Figure 7 This is a cross-sectional view of the overall structure of the present invention.

[0017] The reference numerals and names in the figure are as follows: Hub 100, rotor mechanism 200, first circumferential surface 110, planetary reduction assembly 300, support base 400, sun gear 310, planetary gear 320, tooth surface 120, rotor assembly 210, stator assembly 220, stator ring 221, tooth crown 222, tooth groove 223, tooth pole 224, rotor ring 211, permanent magnet 212, rotating shaft 230, support plate 410, sleeve 420, support rod 430, end cover 500, pressing ring 510, supporting step 411, limiting step 130, limiting ring 440, first gear 321, second gear 322, fixed base 600, base body 610, fixed plate 620, control circuit board 700, conductive wire 800, protrusion 421, first groove 221a, second groove 221b. Detailed Implementation

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] The present invention will now be described in more detail. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them.

[0020] In the description of this invention, it should be noted that directional terms such as "front," "rear," "up," "down," "left," "right," "horizontal," "vertical," "horizontal," and "top," "bottom," etc., indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as limiting the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner or outer contours of each component itself. In the description of this invention, it should be noted that the use of terms such as "first" and "second" to define components is merely for the convenience of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0021] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0022] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0023] The preferred embodiments of the present invention will now be further described with reference to the accompanying drawings, such as... Figure 1As shown, a planetary reduction hub motor 100 includes a hub 100 and a rotor mechanism 200. The hub 100 has a first circumferential surface 110 for contacting the ground. A planetary reduction assembly 300 and a support base 400 are disposed inside the hub 100. The planetary reduction assembly 300 includes a sun gear 310 and a plurality of planetary gears 320. The planetary gears 320 mesh with the sun gear 310 and are arranged around the sun gear 310. A tooth surface 120 is provided around the inner wall of the hub 100, and the tooth surface 120 meshes with the planetary gears 320. The rotor mechanism 200 and the planetary reduction assembly 300 are respectively mounted on both sides of the support base 400. The rotor mechanism 200 is used to drive the planetary reduction assembly 300 to rotate the first circumferential surface 110.

[0024] This application relates to a hub motor 100, whose main function is to form a self-drive within the hub 100, enabling the hub 100 to move on the contact surface. In the implementation of this application, the hub 100 has a first circumferential surface 110, which is used to rotate in the driven state, thereby allowing it to move along the ground. In the working state of this application, after the rotor mechanism 200 is energized, it drives the sun gear 310 to rotate, thereby driving the planetary gear 320 to rotate. Since the tooth surface 120 meshes with the planetary gear 320, it can further drive the hub 100 and the first circumferential surface 110 to rotate, thereby enabling the hub 100 to move along the bottom surface.

[0025] Compared to existing technologies, this application adopts a planetary reduction structure, eliminating multi-stage gear transmission, significantly improving transmission efficiency, reducing energy consumption, extending battery life with the same amount of electricity, minimizing temperature rise, and enhancing overall stability and user experience. Simultaneously, a single support base 400 supports the rotor mechanism 200 and the planetary reduction assembly 300, resulting in a more compact structure, thinner axial profile, and higher space utilization, facilitating lightweight and miniaturized design. High integration, cost-effectiveness, fewer assembly steps, better consistency, and plug-and-play functionality effectively shorten the overall machine development cycle and improve mass production yield.

[0026] Furthermore, based on the above embodiments, such as Figure 2As shown, the rotor mechanism 200 includes a rotor assembly 210 and a stator assembly 220. The stator assembly 220 includes a stator ring 221, with toothed crowns 222 extending outward along the outer circumference of the stator ring 221. The toothed crowns 222 are used to wind coil windings (not shown in the figure). The toothed crowns 222 divide the outer circumference of the motor stator into several toothed grooves 223. Tooth poles 224 are provided at the ends of the toothed crowns 222. The rotor assembly 210 includes a rotor ring 211 surrounding the stator ring 221. Several permanent magnets 212 are embedded in the outer wall of the rotor ring 211. A rotating shaft 230 is fixed inside the rotor ring 211. When the coil is energized, a magnetic field is generated. The magnetic field and the permanent magnets 212 interact to drive the rotor ring 211 to rotate, thereby driving the rotating shaft 230 to rotate.

[0027] Furthermore, based on the above embodiments, such as Figure 3 As shown, the support base 400 includes a support plate 410. A sleeve 420 and a support rod 430 are respectively provided on both sides of the support plate 410. The sleeve 420 and the support rod 430 are perpendicular to the support plate 410. The rotating shaft 230 is located inside the sleeve 420 and passes through the support plate 410. The sun gear 310 and the planetary gear 320 are respectively sleeved on the rotating shaft 230 and the support rod 430. When the rotor mechanism 200 is energized, it drives the rotor ring 211 to rotate, thereby driving the rotating shaft 230 to rotate, which in turn drives the sun gear 310 to drive the planetary gear 320 to rotate.

[0028] Furthermore, based on the above embodiments, combined with Figure 1 , Figure 3 , Figure 4 and Figure 7As shown, an end cap 500 is wrapped around the rotor mechanism 200. A pressing ring 510 extends from the side of the end cap 500 toward the hub 100 and can be inserted into the hub 100. A supporting step 411 extends outward from the edge of the support plate 410. A limiting step 130 is provided around the inner wall of the hub 100. A limiting ring 440 is provided around the outside of the support plate 410. One side of the limiting ring 440 contacts the limiting step 130. When the end cap 500 is inserted into the hub 100, the pressing ring 510 presses against the other side of the limiting ring 440. The support plate 410 is supported on the limiting ring 440 by the supporting step 411. When the support plate 410 needs to be assembled into the wheel hub 100, the limiting ring 440 is first placed on the limiting step 130, and then the supporting step 411 contacts the other side of the limiting ring 440 so that it is supported on the limiting ring 440. Finally, the end cap 500 is inserted into the wheel hub 100, and the pressing ring 510 and the limiting step 130 are used to fix the limiting ring 440 in the wheel hub 100, thereby ensuring the stability of the limiting ring 440 and preventing the limiting ring 440 from shifting position while supporting the support plate 410.

[0029] Furthermore, based on the above embodiments, such as Figure 5 As shown, the planetary gear 320 includes a first gear 321 and a second gear 322 fixedly connected vertically. The first gear 321 meshes with the sun gear 310, and the second gear 322 meshes with the tooth surface 120. When the rotating shaft 230 drives the sun gear 310 to rotate, it drives the first gear 321 and the second gear 322 to rotate synchronously. Since the second gear 322 meshes with the tooth surface 120, it drives the first circumferential surface 110 to rotate. In this process, the speed reduction effect can be achieved by designing different gear ratios for the first gear 321 and the second gear 322.

[0030] Furthermore, based on the above embodiments, combined with Figure 6 and Figure 7 As shown, the rotor mechanism 200 is disposed on one side of the support plate 410, and a hollow fixing seat 600 is disposed on the other side of the support plate 410. The fixing seat 600 is sleeved inside the hub 100. The fixing seat 600 includes a seat body 610, and a hollow fixing plate 620 is disposed on the side of the seat body 610 facing the support plate 410. One end of the support plate 410 is connected to the support plate 410, and the other end is fixed to the fixing plate 620. In this way, both sides of the support rod 430 are fixed and will not move, thereby ensuring the stability of the planetary gear 320 during rotation.

[0031] Furthermore, based on the above embodiments, combined with Figure 1 , Figure 3 and Figure 7 As shown, a control circuit board 700 is disposed on the side of the support plate 410 away from the support rod 430. The control circuit board 700 is electrically connected to the coil winding (not shown in the figure). A conductive wire 800 is disposed outside the hub 100. The conductive wire 800 passes through the hollow fixing seat 600 and through the support plate 410 to connect to the control circuit board 700. In this way, when it is necessary to energize the coil winding, an electrical signal can be generated to the control circuit board 700 through the conductive wire 800, and then transmitted to the coil winding through the control circuit board 700.

[0032] Furthermore, based on the above embodiments, combined with Figure 2 , Figure 3 and Figure 7 As shown, the sleeve 420 is inserted between the stator ring 221 and the rotor ring 211. A protrusion 421 extends along the axial direction of the sleeve 420. A first groove 221a is provided on the inner wall of the stator ring 221 to cooperate with the protrusion 421. When the sleeve 420 is inserted between the stator ring 221 and the rotor ring 211, the protrusion 421 is embedded in the first groove 221a. In this way, while the support seat 400 supports the stator ring 221, the protrusion 421 embedded in the first groove 221a can fix the stator ring 221 and the support seat 400 to each other, thereby preventing the influence of the rotation of the rotor ring 211.

[0033] Furthermore, based on the above embodiments, combined with Figure 2 , Figure 3 and Figure 7 As shown, a second groove 221b is also provided on the inner wall of the stator ring 221, and the second groove is spaced apart from the first groove 221a. The heat generated after the coil winding is energized can be transferred to the stator ring 221, and then dissipated outward through the second groove 221b between the sleeve 420 and the stator ring 221, thereby further improving the reliability of heat dissipation.

[0034] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A planetary gear reducer hub motor, characterized in that, The device includes a hub (100) and a rotor mechanism (200). The hub (100) has a first circumferential surface (110) for contacting the ground. A planetary reduction assembly (300) and a support base (400) are disposed inside the hub (100). The planetary reduction assembly (300) includes a sun gear (310) and a plurality of planetary gears (320). The planetary gears (320) mesh with the sun gear (310) and are arranged around the sun gear (310). A toothed surface (120) is provided around the inner wall of the hub (100) and meshes with the planetary gears (320). The rotor mechanism (200) and the planetary reduction assembly (300) are respectively mounted on both sides of the support base (400). The rotor mechanism (200) is used to drive the planetary reduction assembly (300) to rotate the first circumferential surface (110).

2. The planetary gear set reduction hub motor according to claim 1, characterized in that, The rotor mechanism (200) includes a rotor assembly (210) and a stator assembly (220). The stator assembly (220) includes a stator ring (221). A tooth crown (222) extends outward along the outer circumference of the stator ring (221). The tooth crown (222) is used to wind the coil. The tooth crown (222) divides the outer circumference of the motor stator into several tooth grooves (223). A tooth pole (224) is provided at the end of the tooth crown (222). The rotor assembly (210) includes a rotor ring (211) surrounding the stator ring (221). Several permanent magnets (212) are embedded in the outer wall of the rotor ring (211). A rotating shaft (230) is fixed inside the rotor ring (211).

3. The planetary gear set reduction hub motor according to claim 2, characterized in that, The support base (400) includes a support plate (410), on both sides of the support plate (410) are respectively provided a sleeve (420) and a support rod (430), the sleeve (420) and the support rod (430) are perpendicular to each other with the support plate (410), the rotating shaft (230) is located inside the sleeve (420) and passes through the support plate (410), and the sun gear (310) and planet gear (320) are respectively sleeved on the rotating shaft (230) and the support rod (430).

4. The planetary gear set reduction hub motor according to claim 3, characterized in that, An end cap (500) is wrapped around the rotor mechanism (200). A pressing ring (510) extends from the side of the end cap (500) facing the hub (100) and can be inserted into the hub (100). A supporting step (411) extends outward from the edge of the support plate (410). A limiting step (130) is provided around the inner wall of the hub (100). A limiting ring (440) is provided around the outside of the support plate (410). One side of the limiting ring (440) contacts the limiting step (130). When the end cap (500) is inserted into the hub (100), the pressing ring (510) presses against the other side of the limiting ring (440). The support plate (410) is supported on the limiting ring (440) by the supporting step (411).

5. The planetary gear set reduction hub motor according to claim 1, characterized in that, The planetary gear (320) includes a first gear (321) and a second gear (322) fixedly connected at the top and bottom. The first gear (321) meshes with the sun gear (310), and the second gear (322) meshes with the tooth surface (120).

6. The planetary gear set reduction hub motor according to claim 3, characterized in that, The rotor mechanism (200) is disposed on one side of the support plate (410), and a hollow fixing seat (600) is disposed on the other side of the support plate (410). The fixing seat (600) is sleeved in the hub (100). The fixing seat (600) includes a seat body (610). A hollow fixing plate (620) is disposed on the side of the seat body (610) facing the support plate (410). One end of the support plate (410) is connected to the support plate (410), and the other end is fixed on the fixing plate (620).

7. The planetary gear set reduction hub motor according to claim 6, characterized in that, A control circuit board (700) is provided on the side of the support plate (410) away from the support rod (430). The control circuit board (700) is electrically connected to the coil winding. A conductive wire (800) is provided outside the hub (100). The conductive wire (800) is connected to the control circuit board (700) through a hollow fixing seat (600) and through the support plate (410).

8. The planetary gear set reduction hub motor according to claim 3, characterized in that, The sleeve (420) is inserted between the stator ring (221) and the rotor ring (211). A protrusion (421) extends along the axial direction of the sleeve (420). A first groove (221a) is provided on the inner wall of the stator ring (221) to cooperate with the protrusion (421). When the sleeve (420) is inserted between the stator ring (221) and the rotor ring (211), the protrusion (421) is embedded in the first groove (221a).

9. The planetary gear set reduction hub motor according to claim 8, characterized in that, A second groove (221b) is also provided on the inner wall of the stator ring (221), and the second groove (221b) is spaced apart from the first groove (221a).

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