Self-generating hub motor

Abstract

The invention provides a self-power-generation hub motor, and relates to the technical field of motors, the self-power-generation hub motor comprises a hub assembly, a motor assembly and a power generation assembly, the motor assembly is arranged on the inner side of the hub assembly, the motor assembly comprises a motor shaft, the two ends of the motor shaft penetrate through the hub assembly and are arranged on the outer side, and the hub assembly is rotatably connected with the motor shaft; the power generation assembly is arranged in the hub assembly and comprises a first stator assembly, a first rotor assembly and a transmission assembly, the first stator assembly is fixedly arranged on the motor shaft, and the first rotor assembly is connected with the hub assembly through the transmission assembly; on one hand, kinetic energy of vehicle braking, sliding, downhill and other working conditions in the running process can be effectively recycled and converted into electric energy for vehicle running, and the endurance mileage of the vehicle can be prolonged; and the installation structure of the existing hub motor does not need to be greatly changed, the adaptability is high, and the universality is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a self-generating hub motor. BACKGROUND

[0002] As the core driving component of new energy vehicles, the core design idea of the hub motor is to integrate the driving motor into the wheel hub to save the transmission shaft, gearbox and other redundant transmission components of the traditional vehicle, thereby simplifying the overall vehicle structure and reducing energy loss. In the prior art, the hub motor is mainly divided into two types: pure driving type and external power generation type. Both types have technical defects that are difficult to overcome and cannot meet the actual needs of vehicles for driving and power generation integration and structural reliability.

[0003] The pure driving type hub motor only integrates a motor assembly, which is usually arranged inside the hub assembly. The motor shafts at both ends of the motor assembly pass through the hub assembly and are connected with the vehicle frame. The hub assembly and the motor shafts are rotatably connected, and only the conversion of electric energy to mechanical energy can be achieved to drive the vehicle to run. Such a hub motor does not have a self-generating function. The rotational kinetic energy of the hub generated during the braking, coasting and downhill stages of the vehicle is wasted by friction of the brake pad, resulting in a significant limitation of the vehicle's range and difficulty in adapting to the range requirements of new energy vehicles.

[0004] To realize kinetic energy recovery, a combined hub motor with an external power generation device appears in the prior art. The independent power generation assembly is usually arranged outside the hub assembly, and the power generation assembly is connected with the hub assembly through a bracket and a transmission mechanism to realize the conversion of the rotational kinetic energy of the hub to electric energy. However, such a structure has many disadvantages. First, the external power generation assembly requires additional installation brackets and transmission mechanisms, which not only increases the overall volume and unsprung mass of the hub assembly, affecting the stability and ride comfort of the vehicle, but also causes additional energy loss due to external transmission links, reducing the power generation efficiency. Second, the motor shafts of the external power generation assembly and the motor assembly cannot be integrated, making it difficult to ensure the coaxiality of the stator, rotor and motor shaft of the power generation assembly, and prone to eccentricity and vibration during operation, resulting in increased component wear and frequent failures. Third, the external structure needs to be significantly modified to the existing hub motor installation structure, which has poor adaptability and cannot flexibly adapt to the installation requirements of various new energy vehicles, and has insufficient versatility.

[0005] Therefore, there is an urgent need for a self-generating hub motor that reasonably integrates the motor assembly and the power generation assembly and has stable assembly structure and strong adaptability to solve the defects of the prior art. SUMMARY

[0006] The purpose of this invention is to provide a self-generating hub motor to solve the aforementioned technical problems in the prior art; the preferred technical solutions among the many technical solutions provided by this invention can produce many technical effects, as detailed below.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] This invention provides a self-generating hub motor, comprising a hub assembly, a motor assembly, and a generator assembly, wherein: the motor assembly is disposed inside the hub assembly, the motor assembly includes a motor shaft, both ends of which pass through the hub assembly and are positioned on the outer side, and the hub assembly is rotatably connected to the motor shaft; the generator assembly is disposed inside the hub assembly, the generator assembly includes a first stator assembly, a first rotor assembly, and a transmission assembly, the first stator assembly is fixedly disposed on the motor shaft, the first rotor assembly is connected to the hub assembly through the transmission assembly, and the hub assembly can drive the first rotor assembly to rotate through the transmission assembly.

[0009] Preferably, the transmission assembly includes a gear ring, a planetary gear assembly, and a sun gear assembly, wherein: the gear ring is fixedly disposed inside the hub assembly and rotates synchronously with the hub assembly; the planetary gear assembly includes a planet carrier and planetary gear bodies rotatably disposed on the planet carrier, the planetary gear bodies are disposed inside the gear ring and mesh with the gear ring; the sun gear assembly is rotatably disposed on the motor shaft, the sun gear assembly meshes with the planetary gear bodies, and the first rotor assembly is connected to the sun gear assembly and rotates synchronously.

[0010] Preferably, the planetary carrier is rotatably mounted on the motor shaft via a one-way bearing.

[0011] Preferably, the sun gear assembly includes a sun gear body and a first support frame, wherein: the sun gear body is connected to and rotates synchronously with the first support frame, and the planetary gear body meshes with the sun gear body; the first stator assembly is located inside the first support frame, and the first rotor assembly is circumferentially fixed on the inner peripheral wall of the first support frame and rotates synchronously with the first support frame.

[0012] Preferably, the number of planetary gear bodies is set to multiple, and all the planetary gear bodies are evenly arranged along the circumference of the sun gear body.

[0013] Preferably, the first support frame is configured as a cylindrical structure with one end open and the opening facing the motor assembly, and the sun gear body is fixedly mounted on the closed end face of the first support frame.

[0014] Preferably, the motor assembly includes a second support frame, a second stator assembly, and a second rotor assembly, wherein: the second support frame is fixedly mounted on the motor shaft; the second stator assembly is fixedly mounted circumferentially on the outer peripheral wall of the second support frame; and the second rotor assembly is fixedly mounted circumferentially on the inner peripheral wall of the hub assembly.

[0015] Preferably, the second support frame is provided with a wheel frame.

[0016] Preferably, the motor shaft has an axially arranged wiring channel for laying motor assembly wiring harness and generator assembly wiring harness inside, the first port of the wiring channel is opened on the end face of the motor shaft, and the second port of the wiring channel is opened on the shaft wall of the motor shaft.

[0017] Preferably, the wheel hub assembly includes a wheel hub shell and an end cap, and the wheel hub shell and the end cap are detachably connected.

[0018] The self-generating hub motor provided by this invention has at least the following beneficial effects: I. Integrating drive and self-generated power to extend vehicle range: This invention clearly places the electric motor assembly inside the wheel hub assembly, and integrates the power generation assembly inside the wheel hub assembly. This eliminates the need for additional external power generation devices, supports, and transmission mechanisms. The linkage between the wheel hub assembly and the first rotor assembly of the power generation assembly is directly achieved through the transmission assembly. Simultaneously, the first stator assembly is fixed to the motor shaft of the electric motor assembly, forming a complete self-generating structure. When the vehicle is in motion, the electric motor assembly outputs power through the cooperation between the motor shaft and the wheel hub assembly, driving the vehicle. During braking, coasting, and downhill driving, the wheel hub assembly drives the transmission assembly, which in turn drives the first rotor assembly to rotate relative to the first stator assembly fixed to the motor shaft. This efficiently converts the kinetic energy of the wheel hub rotation into electrical energy for recovery and storage, thereby reducing energy waste and extending the vehicle's driving range.

[0019] II. Compact and stable structure, reducing energy consumption and improving driving performance: The power generation component is integrated inside the wheel hub assembly, eliminating the need for brackets and other components required for external power generation devices. This simplifies the overall structure, reduces the number of parts, and lowers manufacturing costs. Simultaneously, it avoids the increased unsprung mass associated with external structures, maximizing the compact and lightweight advantages of the wheel hub motor and reducing vehicle drag. Furthermore, the first stator assembly is directly fixed to the motor shaft, and the first rotor assembly is connected to the wheel hub assembly via a transmission assembly. This ensures the coaxiality of the first stator and rotor assemblies, effectively avoiding issues such as eccentricity, vibration, and wear found in existing external solutions. This improves operational stability, reduces energy loss, balances drive and power generation efficiency, and enhances vehicle chassis stability and ride comfort.

[0020] Third, it has strong adaptability and versatility, requiring no major modifications to the existing structure: The present invention adopts a design in which both ends of the motor shaft pass through the hub assembly and are placed on the outside, which is compatible with the existing hub motor installation structure. It does not require major modifications to the installation structure of existing new energy vehicles, and can be directly adapted to the installation requirements of existing vehicles, making it highly versatile. Attached Figure Description

[0021] 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.

[0022] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is an exploded view of the structure of the present invention; Figure 3 This is a schematic diagram of the structure of the electric motor assembly installed on the motor shaft according to the present invention; Figure 4 This is a schematic diagram of the structure of the power generation component of the present invention installed on the motor shaft; Figure 5 This is an exploded view of the power generation component of the present invention; Figure 6 This is an exploded view of the transmission component of the present invention.

[0023] Figure Labels 1. Hub assembly; 11. Hub housing; 12. End cap; 2. Motor assembly; 21. Motor shaft; 211. Wiring channel; 22. Second support frame; 23. Second stator assembly; 24. Second rotor assembly; 3. Generator assembly; 31. First stator assembly; 32. First rotor assembly; 33. Transmission assembly; 331. Gear ring; 332. Planetary gear assembly; 3321. Planetary carrier; 3322. Planetary gear body; 333. Sun gear assembly; 3331. Sun gear body; 3332. First support frame. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0025] Example 1: This invention provides a self-generating hub motor, referenced Figures 1 to 6 As shown, the self-generating hub motor includes a hub assembly 1, a motor assembly 2, and a power generation assembly 3.

[0026] The motor assembly 2 is located inside the hub assembly 1. The motor assembly 2 includes a motor shaft 21. Both ends of the motor shaft 21 pass through the hub assembly 1 and are located on the outside. The hub assembly 1 and the motor shaft 21 are rotatably connected by bearings.

[0027] The power generation component 3 is located inside the hub assembly 1. The power generation component 3 includes a first stator assembly 31, a first rotor assembly 32 and a transmission assembly 33. The first stator assembly 31 is fixedly mounted on the motor shaft 21. The first rotor assembly 32 is connected to the hub assembly 1 through the transmission assembly 33. The hub assembly 1 can drive the first rotor assembly 32 to rotate through the transmission assembly 33.

[0028] When in use, the tire is installed on the wheel hub assembly 1, the motor assembly 2 works, the wheel hub assembly 1 rotates relative to the motor shaft 21, thereby driving the tire to rotate and achieve driving.

[0029] During driving, when the vehicle brakes, coasts, or goes downhill, the hub assembly 1 drives the first rotor assembly 32 to rotate relative to the first stator assembly 31 through the transmission assembly 33, thereby converting the rotational kinetic energy of the hub assembly 1 into electrical energy for recovery and storage.

[0030] This invention integrates the power generation component 3 into the wheel hub motor. On the one hand, it can effectively recover the kinetic energy of the vehicle during braking, coasting, and downhill driving, and convert it into electrical energy for the vehicle to use, thus extending the vehicle's driving range. On the other hand, the integrated structure is not only compact and stable, improving driving performance, but also does not require significant changes to the existing wheel hub motor installation structure, making it highly adaptable and versatile.

[0031] Example 2: Example 2 is based on Example 1: like Figures 1 to 6 As shown, the transmission assembly 33 adopts a planetary gear transmission assembly, including a gear ring 331, a planetary gear assembly 332, and a sun gear assembly 333.

[0032] The gear ring 331 is fixedly installed inside the hub assembly 1. Specifically, a fixed bracket is provided inside the hub assembly 1, and the gear ring 331 is arranged circumferentially on the inner peripheral wall of the fixed bracket. The gear ring 331 rotates synchronously with the hub assembly 1. The planetary gear assembly 332 includes a planet carrier 3321 and a planetary gear body 3322. The planetary gear body 3322 is rotatably installed on the planet carrier 3321 and is installed inside the gear ring 331 and meshes with the gear ring 331. The sun gear assembly 333 is rotatably installed on the motor shaft 21 and meshes with the planetary gear body 3322. The first rotor assembly 32 is connected to the sun gear assembly 333 and rotates synchronously.

[0033] The gear ring 331 is fixed to the inner circumferential wall of the hub assembly 1 and rotates synchronously. The planetary gear body 3322 meshes between the gear ring 331 and the sun gear assembly 333, thus forming a stable planetary gear transmission structure.

[0034] When the vehicle brakes or coasts, the wheel hub assembly 1 drives the gear ring 331 to rotate synchronously. The gear ring 331 drives the planetary gear body 3322 to rotate through meshing, which in turn drives the sun gear assembly 333 to rotate, and finally drives the first rotor assembly 32 connected to the sun gear assembly 333 to rotate. Combining the characteristics of planetary gear transmission, this structure can achieve accelerated rotation of the sun gear assembly 333 relative to the gear ring 331, enabling the first rotor assembly 32 to obtain the high speed required for efficient power generation, greatly improving the power generation efficiency of the power generation assembly 3, maximizing the recovery of the kinetic energy of the wheel hub rotation, and further extending the vehicle's driving range.

[0035] As an optional implementation, the planetary carrier 3321 is rotatably mounted on the motor shaft 21 via a one-way bearing.

[0036] In practical applications, when reversing, the planetary carrier 3321 rotates in the opposite direction to the locking direction of the one-way bearing. The one-way bearing is unlocked, and the planetary carrier 3321 rotates freely relative to the motor shaft 21, which can ensure smooth reversing.

[0037] As an optional implementation, the sun gear assembly 333 includes a sun gear body 3331 and a first support frame 3332. The sun gear body 3331 is connected to the first support frame 3332 and rotates synchronously. The planet gear body 3322 meshes with the sun gear body 3331. The first stator assembly 31 is located inside the first support frame 3332. The first rotor assembly 32 is fixedly disposed circumferentially on the inner peripheral wall of the first support frame 3332 and rotates synchronously with the first support frame 3332.

[0038] The sun gear assembly 333 and the first rotor assembly 32 form an integrated assembly structure, ensuring that the first rotor assembly 32 can rotate synchronously and smoothly when the sun gear assembly 333 rotates, avoiding unstable power generation caused by rotor slippage; at the same time, this structure can accurately ensure the coaxiality of the first stator assembly 31, the first rotor assembly 32 and the motor shaft 21, avoiding eccentricity and vibration caused by the scattered assembly of components, reducing energy loss in the power generation process and improving power generation efficiency.

[0039] As an optional implementation, the number of planetary gear bodies 3322 is set to multiple. Preferably, the number of planetary gear bodies 3322 is set to three, and all planetary gear bodies 3322 are evenly arranged around the circumference of the sun gear body 3331.

[0040] The arrangement of multiple planetary gear bodies 3322 can evenly distribute the force and torque transmitted from the ring gear 331 to the sun gear assembly 333 onto each planetary gear body 3322, avoiding excessive load on a single planetary gear body 3322, which could lead to tooth wear, breakage, bearing damage, and other malfunctions.

[0041] As an optional implementation, the first support frame 3332 is configured as a cylindrical structure with one end open and the opening facing the motor assembly 2, and the sun gear body 3331 is fixedly mounted on the closed end face of the first support frame 3332.

[0042] The first support frame 3332 adopts a cylindrical structure, which optimizes space utilization and makes the structure more compact, while ensuring structural rigidity and protecting its internal components.

[0043] As an optional implementation, the motor assembly 2 includes a second support frame 22, a second stator assembly 23, and a second rotor assembly 24. The second support frame 22 is fixedly mounted on the motor shaft 21. The second stator assembly 23 is fixedly mounted circumferentially on the outer peripheral wall of the second support frame 22, and the second rotor assembly 24 is fixedly mounted circumferentially on the inner peripheral wall of the hub assembly 1.

[0044] During vehicle operation, the power supply provides power, and the second rotor assembly 24 rotates relative to the second stator assembly 23, thereby driving the wheel hub assembly 1 and the tires to rotate, thus enabling the vehicle to move.

[0045] Specifically, the second support frame 22 is equipped with a wheel frame.

[0046] As an optional implementation, a wiring channel 211 is provided axially inside the motor shaft 21. The first port of the wiring channel 211 is opened on the end face of the motor shaft 21, and the second port of the wiring channel 211 is opened on the shaft wall of the motor shaft 21.

[0047] The wiring channel 211 is used to lay the wiring harness of the motor assembly 2 and the power generation assembly 3. It can not only standardize the wiring and avoid wiring interference and damage to the wiring harness, but also optimize the internal structural layout and further improve the space utilization.

[0048] As an optional implementation, the hub assembly 1 includes a hub shell 11 and an end cap 12, which are detachably connected.

[0049] Specifically, the hub housing 11 and end cap 12 are detachable and can be installed using threaded fasteners, which not only ensures a secure installation but also facilitates disassembly and subsequent maintenance.

[0050] In the description of this application, it should be understood that the terms "upper", "lower", "inner", "outer", "top", "bottom", 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.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" or "several" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0052] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0053] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A self-generating hub motor, characterized in that, This includes wheel hub components, electric motor components, and power generation components, among which: The motor assembly is disposed inside the hub assembly. The motor assembly includes a motor shaft, the two ends of which pass through the hub assembly and are positioned on the outside. The hub assembly is rotatably connected to the motor shaft. The power generation component is disposed inside the hub assembly. The power generation component includes a first stator assembly, a first rotor assembly, and a transmission assembly. The first stator assembly is fixedly disposed on the motor shaft. The first rotor assembly is connected to the hub assembly through the transmission assembly. The hub assembly can drive the first rotor assembly to rotate through the transmission assembly.

2. The self-generating hub motor according to claim 1, characterized in that, The transmission assembly includes a ring gear, a planetary gear assembly, and a sun gear assembly, wherein: The gear ring is fixedly disposed inside the wheel hub assembly and rotates synchronously with the wheel hub assembly; The planetary gear assembly includes a planet carrier and planetary gear bodies rotatably mounted on the planet carrier. The planetary gear bodies are disposed within the gear ring and mesh with the gear ring. The sun gear assembly is rotatably mounted on the motor shaft. The sun gear assembly meshes with the planetary gear body. The first rotor assembly is connected to the sun gear assembly and rotates synchronously.

3. The self-generating hub motor according to claim 2, characterized in that, The planetary carrier is rotatably mounted on the motor shaft via a one-way bearing.

4. The self-generating hub motor according to claim 2, characterized in that, The sun gear assembly includes a sun gear body and a first support frame, wherein: The sun gear body is connected to the first support frame and rotates synchronously, and the planet gear body meshes with the sun gear body; The first stator assembly is located inside the first support frame, and the first rotor assembly is fixedly mounted on the inner peripheral wall of the first support frame in the circumferential direction and rotates synchronously with the first support frame.

5. The self-generating hub motor according to claim 4, characterized in that, The number of planetary gear bodies is set to multiple, and all the planetary gear bodies are evenly arranged along the circumference of the sun gear body.

6. The self-generating hub motor according to claim 4, characterized in that, The first support frame is configured as a cylindrical structure with one end open and the opening facing the motor assembly, and the sun gear body is fixedly mounted on the closed end face of the first support frame.

7. The self-generating hub motor according to claim 1, characterized in that, The motor assembly includes a second support frame, a second stator assembly, and a second rotor assembly, wherein: The second support frame is fixedly mounted on the motor shaft; The second stator assembly is fixedly mounted circumferentially on the outer peripheral wall of the second support frame; The second rotor assembly is fixedly mounted circumferentially on the inner peripheral wall of the hub assembly.

8. The self-generating hub motor according to claim 7, characterized in that, The second support frame is equipped with a wheel frame.

9. The self-generating hub motor according to claim 1, characterized in that, The motor shaft has a wiring channel arranged axially inside for laying the motor component wiring harness and the generator component wiring harness. The first port of the wiring channel is opened on the end face of the motor shaft, and the second port of the wiring channel is opened on the shaft wall of the motor shaft.

10. The self-generating hub motor according to claim 1, characterized in that, The wheel hub assembly includes a wheel hub shell and an end cap, which are detachably connected.

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