Wheel hub motor, drive system and vehicle

Abstract

The application provides a wheel hub motor, a driving system and a vehicle, and the wheel hub motor comprises a stator assembly, a rotor assembly, a wheel hub bearing, a motor housing, wherein the stator assembly is connected with the motor housing; the rotor assembly is two, and the two rotor assemblies are respectively located on the two sides of the stator assembly and coaxially arranged with the stator assembly; the rotor assembly comprises a rotor shaft, and the stator assembly is rotationally connected with the rotor shaft; the wheel hub bearing comprises a bearing inner ring and a bearing outer ring, the bearing inner ring is located on the inner side of the bearing outer ring, the bearing inner ring and the bearing outer ring are rotationally connected, the rotor shaft is connected with the bearing inner ring, the wheel hub of the vehicle is connected with the bearing inner ring, the stator assembly is connected with the bearing outer ring, and the motor housing is connected with the bearing outer ring. By adopting the technical scheme, the problem that the wheel hub motor is arranged in the wheel hub and the axial length in the wheel is too long is effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wheel hub motor design, in particular to a wheel hub motor, a driving system and a vehicle. BACKGROUND

[0002] With the rapid development of electric vehicles, people's demand for higher efficiency and longer range electric vehicles is growing urgently. In the prior art, the layout form of the electric vehicle driving system generally adopts the centralized layout mode of traditional gasoline vehicles, and the power transmission to the four wheels needs complex transmission shafts, differentials, reducers and other transmission devices. The vehicle has a long transmission path, resulting in low system efficiency and occupying a large amount of space on the chassis, which is not suitable for the development needs of future new energy vehicles. The wheel hub motor technology emerges as the times require, which arranges the motor in the wheel hub, greatly simplifying the layout form of the power system and the transmission system. However, the existing wheel hub motor integrated in the wheel hub inside leads to an excessively long axial length in the wheel, a heavy unsprung mass, poor heat dissipation effect, and increased difficulty in arranging the suspension and steering system.

[0003] In view of the above problems in the prior art, no effective solution has been proposed so far. SUMMARY

[0004] The main purpose of the present application is to provide a wheel hub motor, a driving system and a vehicle to solve the problem of excessively long axial length in the wheel caused by arranging the wheel hub motor inside the wheel hub in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a wheel hub motor is provided, comprising: a stator assembly connected with a motor shell; two rotor assemblies, the two rotor assemblies are respectively located on both sides of the stator assembly and are coaxially arranged with the stator assembly, the rotor assembly comprises a rotor shaft, the stator assembly is rotatably connected with the rotor shaft; a wheel hub bearing, the wheel hub bearing comprises a bearing inner ring and a bearing outer ring, the bearing inner ring is located inside the bearing outer ring, the bearing inner ring and the bearing outer ring are rotatably connected, the rotor shaft is connected with the bearing inner ring, the wheel hub of the vehicle is connected with the bearing inner ring, the stator assembly is connected with the bearing outer ring, and the motor shell is connected with the bearing outer ring.

[0006] Further, the wheel hub motor comprises a brake disc, the brake disc is connected with the bearing inner ring, the motor shell is provided with a brake caliper mounting point on the side close to the wheel of the vehicle, the brake caliper of the vehicle can be mounted in the brake caliper mounting point, and the brake caliper cooperates with the brake disc to perform brake operation on the wheel.

[0007] Further, the wheel hub bearing is arranged on the side close to the wheel of the rotor assembly, and the motor shell and the brake disc are arranged on both sides of the wheel hub bearing respectively.

[0008] Further, a plurality of hub bearing rollers are arranged between the bearing inner ring and the bearing outer ring, and the bearing inner ring is rotatably connected with the bearing outer ring through the hub bearing rollers.

[0009] Further, the stator assembly comprises a stator frame, a plurality of stator cores and a plurality of stator windings are arranged on the stator frame, and stator clamping plates are arranged on both sides of the central axis direction of the stator frame, the stator clamping plates can fix the stator cores and the stator windings on the stator frame, the stator frame is fixedly connected with the motor shell, and the stator frame is fixedly connected with the bearing outer ring.

[0010] Further, the rotor assembly comprises a rotor frame, a plurality of permanent magnets are arranged on the rotor frame, and the rotor frame is connected with the rotor shaft through splines, and one end of the rotor shaft facing the wheel is connected with the bearing inner ring.

[0011] Further, a rotor bearing is arranged on the side of the rotor shaft away from the wheel, and the rotor bearing and the hub bearing are respectively arranged on both sides of the central axis direction of the rotor assembly, and the rotor bearing and the hub bearing jointly support the rotor shaft.

[0012] Further, the hub motor is connected with the hub, the hub is connected with the wheel, and the hub motor and the wheel are respectively arranged on the inner side and the outer side in the radial direction of the hub.

[0013] According to another aspect of the present application, a driving system is provided, comprising a hub motor, which is the hub motor described above.

[0014] According to another aspect of the present application, a vehicle is provided, comprising a driving system, which is the driving system described above.

[0015] By arranging the rotor assembly on both sides of the stator assembly and coaxially arranging the rotor assembly with the stator assembly, the coaxial design of the two is realized, the axial space is saved under the condition that the performance of the hub motor is better, the rotor shaft and the hub are connected with the bearing inner ring, the stator assembly and the motor shell are connected with the bearing outer ring, and the rotor bearing does not need to be arranged on both sides of the rotor assembly, the hub bearing replaces the outer rotor bearing, and the in-wheel axial length is further reduced. Further, by connecting the rotating parts such as the rotor shaft and the hub with the bearing inner ring and supporting the fixed parts such as the stator assembly and the motor shell by the bearing outer ring, the integration of the hub motor is improved. By using the technical solution of the present application, the problem of excessive in-wheel axial length caused by arranging the hub motor inside the wheel hub in the prior art is effectively solved. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the specification explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0017] Fig. 1 A structural schematic diagram of a first embodiment of the wheel motor according to the present application is shown;

[0018] Fig. 2 A structural schematic diagram of a second embodiment of the wheel motor according to the present application is shown;

[0019] Fig. 3 A structural schematic diagram of a third embodiment of the wheel motor according to the present application is shown.

[0020] Wherein, the above figures include the following reference signs:

[0021] 10, stator assembly; 11, stator frame; 12, stator core; 13, stator winding; 14, stator clamp plate;

[0022] 20, motor housing; 21, brake caliper mounting point;

[0023] 30, rotor assembly; 31, rotor frame; 32, permanent magnet;

[0024] 40, bearing inner ring;

[0025] 50, bearing outer ring;

[0026] 60, wheel hub;

[0027] 70, brake disc;

[0028] 80, brake caliper;

[0029] 90, wheel;

[0030] 100, wheel hub bearing roller;

[0031] 110, rotor bearing;

[0032] 120, end busbar; 121, upper control arm; 122, lower control arm; 123, damping system. DETAILED DESCRIPTION

[0033] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0034] It should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that the terms "comprise" and / or "include" as used in the specification indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0035] It is to be understood that the terms "first", "second", and the like, used in the description and the claims of the present application as well as the above description of the drawings merely specify the names of similar objects and do not necessarily have a particular order or chronology. It is to be understood that the terms so used are interchangeable under appropriate circumstances and embodiments of the application described herein are capable of operating in other sequences than the one explicitly described or illustrated herein. Furthermore, the terms "comprise", "comprising", "include", "including", and the like, used in the description and the claims of the present application and the above description of the drawings, are used in the sense of "including but not limited to".

[0036] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in various different forms, and should not be construed as being limited to only the embodiments set forth herein. It is understood that the embodiments are provided so as to make the present application thoroughly and completely, and to fully convey the idea of the exemplary embodiments to one of ordinary skill in the art, and in the drawings, the thicknesses of layers and regions can be exaggerated for clarity, and the same reference numerals are used throughout the drawings and thus repetitive descriptions are omitted.

[0037] In connection with Figs. 1 to 3 As shown, according to a specific embodiment of the present application, a wheel hub motor is provided.

[0038] The wheel hub motor comprises a stator assembly 10, a rotor assembly 30, and a wheel hub bearing. The stator assembly 10 is connected with a motor housing 20. The rotor assembly 30 is two, and the two rotor assemblies 30 are respectively located on both sides of the stator assembly 10 and are coaxially arranged with the stator assembly 10, and the rotor assembly 30 comprises a rotor shaft, and the stator assembly 10 is rotationally connected with the rotor shaft. The wheel hub bearing comprises a bearing inner ring 40 and a bearing outer ring 50, the bearing inner ring 40 is located inside the bearing outer ring 50, and the bearing inner ring 40 is rotationally connected with the bearing outer ring 50. The rotor shaft is connected with the bearing inner ring 40, the wheel hub 60 of the vehicle is connected with the bearing inner ring 40, the stator assembly 10 is connected with the bearing outer ring 50, and the motor housing 20 is connected with the bearing outer ring 50.

[0039] The application has the following beneficial effects. The rotor assembly 30 is arranged on both sides of the stator assembly 10 and coaxially arranged with the stator assembly 10, so that the coaxial design is realized, the axial space is saved under the condition that the performance of the in-wheel motor is better, the rotor shaft and the hub 60 are connected with the bearing inner ring 40, the stator assembly 10 and the motor housing 20 are connected with the bearing outer ring 50, the rotor bearing is not arranged on both sides of the rotor assembly, the hub bearing replaces the original outer rotor bearing, and the in-wheel axial length is further shortened. Further, the rotor shaft and the hub 60 are connected with the bearing inner ring 40, the stator assembly 10 and the motor housing 20 are supported by the bearing outer ring 50, and the integration of the in-wheel motor is improved. The application effectively solves the problem of the long in-wheel axial length caused by the arrangement of the in-wheel motor in the wheel hub in the prior art, and saves the axial arrangement space. Fig. 2 The component shown at A in FIG. 8 is an in-wheel motor.

[0040] Further, the in-wheel motor comprises a brake disc 70, the brake disc 70 is connected with the bearing inner ring 40, the motor housing 20 is provided with a brake caliper mounting point 21 on the side close to the wheel 90 of the vehicle, the brake caliper 80 of the vehicle can be mounted in the brake caliper mounting point 21, the brake caliper 80 cooperates with the brake disc 70 to perform the braking operation on the wheel 90. The brake disc 70 is fixedly connected with the bearing inner ring 40 through the spline, and is used for transmitting the wheel braking force. The motor housing 20 leaves the brake caliper mounting point 21 (the brake caliper mounting point 21 comprises a space groove with a predetermined size), and the brake caliper 80 is fixedly installed through the bolt, the brake caliper 80 brakes by pressing the brake disc 70, thereby solving the problem of the large axial length caused by the arrangement of the brake caliper of the in-wheel motor. The brake caliper 80 is arranged in the motor housing, and the high integration of the braking system and the motor is realized. Further, the hub bearing inner and outer ring structure can support the motor body, the brake disc, the hub and other components, and the technical effect of reducing the axial size of the in-wheel motor is achieved.

[0041] The hub bearing is arranged on the side of the rotor assembly 30 close to the wheel 90, and the motor housing 20 and the brake disc 70 are arranged on both sides of the hub bearing. In this way, the integration of the hub bearing and the braking device is further improved, and the hub bearing can replace the original outer rotor bearing.

[0042] Further, a plurality of hub bearing rollers 100 are arranged between the bearing inner ring 40 and the bearing outer ring 50, and the bearing inner ring 40 is rotatably connected with the bearing outer ring 50 through the hub bearing rollers 100. The plurality of hub bearing rollers 100 are arranged along the circumference of the bearing inner ring 40.

[0043] As shown in FIG. 8, the in-wheel motor comprises a rotor assembly 30, a stator assembly 10, a motor housing 20 and a brake disc 70. Fig. 3As shown, the stator assembly 10 includes a stator frame 11, the stator frame 11 is provided with a plurality of stator cores 12 and a plurality of stator windings 13, and the stator frame 11 is provided with stator clamping plates 14 on both sides of the central axis direction, the stator clamping plates 14 can fix the stator core 12 and the stator winding 13 on the stator frame 11, the stator frame 11 is fixedly connected with the motor housing 20, and the stator frame 11 is fixedly connected with the bearing outer ring 50. The stator frame 11 is hollow in the axial center and is fixedly connected with the motor housing. The stator winding and the stator core are both provided with a plurality of stator cores, which are uniformly arranged in a fan shape on the stator frame 11, and then are tightly fixed by the stator clamping plates 14 on both sides. The motor housing 20 is fixedly connected with the bearing outer ring 50, so as to fix the motor stator assembly.

[0044] Preferably, the rotor assembly 30 includes a rotor frame 31, the rotor frame 31 is provided with a plurality of permanent magnets 32, the rotor frame 31 is connected with the rotor shaft through the spline, and one end of the rotor shaft towards the wheel 90 is connected with the bearing inner ring 40. The rotor frame 31 on both sides is fixedly connected with the rotor shaft through the key groove, so as to transmit the movement of the rotor to the rotor shaft and finally to the wheel 90. The rotor assembly 30 is arranged on both sides of the stator assembly, interacts with the stator excitation magnetic field to form an axial magnetic field, drives the rotor frame 31 to rotate, and then transmits the movement to the rotor shaft and the hub. The rotor assembly includes the rotor frame and the permanent magnet, wherein the permanent magnet is provided with a plurality of permanent magnets, which are uniformly arranged in a fan shape on the rotor frame.

[0045] In order to provide support to the side of the rotor shaft away from the wheel, the rotor shaft away from the wheel 90 is provided with a rotor bearing 110, and the rotor bearing 110 and the hub bearing are respectively located on both sides of the central axis direction of the rotor assembly 30, and the rotor bearing 110 and the hub bearing jointly support the rotor shaft.

[0046] As shown in the figure, Fig. 2 The hub motor is connected with the hub 60, the hub 60 is connected with the wheel 90, and the hub motor and the wheel 90 are respectively located on the inner side and the outer side of the radial direction of the hub 60.

[0047] According to another specific embodiment of the present application, a driving system is provided, which includes the hub motor in the above-mentioned embodiments.

[0048] As shown in the figure, Fig. 2 The hub motor is arranged on the inner side of the hub 60 and is fixed by the upper control arm 121 through the bolt, the hub motor shaft center and the wheel 90 center are fixedly coincided. The hub motor is provided with a bolt hole below, which is fixedly connected with the lower control arm 122 through the bolt, and the vibration generated in the wheel driving is transmitted to the damping system 123 on the lower control arm 122 through the connection of the motor housing and the lower control arm 122.

[0049] According to another specific embodiment of the present application, a vehicle is provided, which includes the driving system in the above-mentioned embodiments.

[0050] From the above description, it can be seen that the above-mentioned embodiments of the application achieve the following technical effects: the bearing inner ring is fixedly connected with rotating parts such as a motor shaft, a brake disc, and a hub, to transmit axial rotation speed and torque. The hub bearing outer ring is fixed, to support fixed parts such as a motor shell, so that the integration of the hub motor and the brake system is higher. The hub 60 is arranged on the inner ring of the hub bearing, to realize synchronous rotation with the rotor shaft and to realize power transmission from the motor to the tire.

[0051] For the convenience of description, spatial relative terms such as "above", "upper", "top surface", "upper surface", and the like can be used herein to describe the spatial relationship of one device or feature to another device or feature as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "above" the other device or structure will be positioned "below" or "below" the other device or structure. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0052] In addition to the above, it should also be noted that "one embodiment", "another embodiment", "embodiment", and the like mentioned in the specification refer to specific features, structures, or characteristics described in connection with the embodiment, which are included in at least one embodiment generally described in the application. The same expression appears in several places in the specification does not necessarily refer to the same embodiment. Further, when a specific feature, structure, or characteristic is described in connection with any embodiment, it is claimed that the implementation of such feature, structure, or characteristic in connection with other embodiments also falls within the scope of the application.

[0053] In the above embodiments, the description of each embodiment is focused on, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0054] The above only describes the preferred embodiments of the application and is not intended to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A hub motor, characterized in that, include: Stator assembly (10), which is connected to motor housing (20); The rotor assembly (30) consists of two rotor assemblies (30), which are located on both sides of the stator assembly (10) and coaxially arranged with the stator assembly (10). The rotor assembly (30) includes a rotor shaft, and the stator assembly (10) is rotatably connected to the rotor shaft. A hub bearing, comprising an inner bearing ring (40) and an outer bearing ring (50), wherein the inner bearing ring (40) is located inside the outer bearing ring (50), the inner bearing ring (40) and the outer bearing ring (50) are rotatably connected, the rotor shaft is connected to the inner bearing ring (40), the wheel hub (60) of the vehicle is connected to the inner bearing ring (40), the stator assembly (10) is connected to the outer bearing ring (50), and the motor housing (20) is connected to the outer bearing ring (50). The hub motor includes a brake disc (70) connected to the inner ring (40) of the bearing. The motor housing (20) has a brake caliper mounting point (21) on the side near the wheel (90) of the vehicle. The brake caliper (80) of the vehicle can be installed in the brake caliper mounting point (21). The brake caliper (80) works in conjunction with the brake disc (70) to perform braking operations on the wheel (90). A rotor bearing (110) is provided on the side of the rotor shaft away from the wheel (90). The rotor bearing (110) and the wheel hub bearing are located on both sides of the central axis of the rotor assembly (30). The rotor bearing (110) and the wheel hub bearing together support the rotor shaft.

2. The hub motor according to claim 1, characterized in that, The hub bearing is located on the side of the rotor assembly (30) near the wheel (90), and the motor housing (20) and the brake disc (70) are respectively arranged on both sides of the hub bearing.

3. The hub motor according to any one of claims 1 to 2, characterized in that, A plurality of hub bearing rollers (100) are provided between the inner ring (40) and the outer ring (50) of the bearing, and the inner ring (40) of the bearing is rotatably connected to the outer ring (50) of the bearing through the hub bearing rollers (100).

4. The hub motor according to any one of claims 1 to 2, characterized in that, The stator assembly (10) includes a stator frame (11), on which a plurality of stator cores (12) and a plurality of stator windings (13) are provided. Stator clamps (14) are provided on both sides of the central axis of the stator frame (11). The stator clamps (14) can fix the stator cores (12) and the stator windings (13) on the stator frame (11). The stator frame (11) is fixedly connected to the motor housing (20) and the stator frame (11) is fixedly connected to the bearing outer ring (50).

5. The hub motor according to any one of claims 1 to 2, characterized in that, The rotor assembly (30) includes a rotor frame (31) on which a plurality of permanent magnets (32) are provided. The rotor frame (31) is connected to the rotor shaft via a spline. The end of the rotor shaft facing the wheel (90) is connected to the inner ring (40) of the bearing.

6. The hub motor according to any one of claims 1 to 2, characterized in that, The hub motor is connected to the hub (60), the hub (60) is connected to the wheel (90), and the hub motor and the wheel (90) are located on the inner and outer sides of the hub (60) in the radial direction, respectively.

7. A drive system comprising a hub motor, characterized in that, The hub motor is the hub motor according to any one of claims 1 to 6.

8. A vehicle, comprising a drive system, characterized in that, The drive system is the drive system described in claim 7.

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