CN218920094U - Hub motor and electric vehicle - Google Patents

Abstract

The utility model discloses a hub motor and an electric vehicle, and relates to the technical field of electric vehicles, wherein the hub motor comprises a central shaft, a shell assembly, a stator and a rotor, the shell assembly is rotationally connected with the central shaft, the shell assembly comprises a rim, a shell and an end cover, the rim is arranged around the peripheral wall of the shell, the end cover is connected with the shell, and a mounting cavity is formed between the end cover and the shell; the stator and the rotor are both arranged in the mounting cavity, and the stator is fixedly connected to the center shaft; the rotor comprises a plurality of iron cores and a plurality of permanent magnets, and the plurality of iron cores and the plurality of permanent magnets are alternately connected along the circumference of the central shaft and fixedly connected to the inner side of the peripheral wall of the shell. The utility model realizes the weight reduction of the whole structure by canceling the design of the steel ring, and can increase the inner diameter of the installation cavity, thereby increasing the radial size of the rotor, increasing the acting area of the rotor and the stator, enabling the hub motor to output larger torque and improving the performance of the hub motor.

Description

Hub motor and electric vehicle

Technical Field

The utility model relates to the technical field of electric vehicles, in particular to a hub motor and an electric vehicle.

Background

In the related art, the larger the weight of the hub motor of the electric two-wheel vehicle is, the worse riding experience of the whole vehicle is caused. A steel ring with larger thickness is welded on the inner ring of the rim of the traditional electric vehicle hub motor, and is used for magnetic conduction, but the weight of the steel ring generally accounts for about 20% of the weight of the whole hub motor. Moreover, the size of the steel ring limits the outer diameter of the rotor and limits the improvement of the motor performance.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the hub motor which can reduce the weight and improve the performance.

The utility model further provides an electric vehicle with the hub motor.

An in-wheel motor according to an embodiment of the first aspect of the present utility model includes: a center shaft; the shell assembly is rotationally connected with the center shaft and comprises a rim, a shell and an end cover, wherein the rim is arranged around the peripheral wall of the shell, the end cover is connected with the shell, and a mounting cavity is formed between the end cover and the shell; the stator is arranged in the mounting cavity and is fixedly connected with the center shaft; the rotor is arranged in the mounting cavity and comprises a plurality of iron cores and a plurality of permanent magnets, and the iron cores and the permanent magnets are alternately connected along the circumferential direction of the central shaft and fixedly connected to the inner side of the peripheral wall of the shell.

The hub motor provided by the embodiment of the utility model has at least the following beneficial effects:

through setting up the casing subassembly that includes rim, shell and end cover formation, the rim sets up around the perisporium outside of shell, the end cover is connected and is formed the installation cavity that holds stator and rotor with the shell, and the rotor is a plurality of iron cores and a plurality of permanent magnet and follows the structure of axial circumference alternate connection and fixed connection in the perisporium inboard of shell moreover, the steel ring among the related art has been cancelled, the weight reduction of overall structure has been realized, and can increase the internal diameter of installation cavity, thereby the radial dimension of increase rotor, make the area of action increase of rotor and stator, make hub motor can export bigger moment of torsion, improve hub motor's performance.

According to some embodiments of the utility model, the housing is made of a non-magnetically permeable material.

According to some embodiments of the utility model, a mounting edge is provided at an end of the housing facing the end cap, the housing assembly further comprises a connecting member fixedly connected to an end of the rim facing the mounting edge, and the end cap, the mounting edge and the connecting member are fixedly connected by bolts.

According to some embodiments of the utility model, the connecting piece comprises a plurality of connecting blocks arranged at intervals along the circumferential direction of the rim, the mounting edge comprises a plurality of mounting lugs arranged at intervals, and the plurality of mounting lugs are arranged in a one-to-one correspondence with the plurality of connecting blocks.

According to some embodiments of the utility model, the connecting piece is annular and is arranged around the rim, the connecting piece is provided with a plurality of first screw holes, the mounting edge is provided with a plurality of second screw holes, and the second screw holes are arranged in one-to-one correspondence with the first screw holes.

According to some embodiments of the utility model, the connector is welded to the rim.

According to some embodiments of the utility model, the connecting member abuts the peripheral wall of the housing or the connecting member is spaced apart from the peripheral wall of the housing.

According to some embodiments of the utility model, the rim is welded and fixed with the shell, a fixed block is formed at one end of the shell facing the end cover, and the end cover and the fixed block are fixedly connected through bolts.

According to some embodiments of the utility model, the rim is connected with the shell in an interference mode or through injection molding, a fixed block is formed at one end of the shell, which faces the end cover, and the end cover and the fixed block are fixedly connected through bolts.

According to some embodiments of the utility model, a clamping groove is arranged on the outer side of the peripheral wall of the shell, and the rim is provided with a clamping table clamped with the clamping groove.

According to some embodiments of the utility model, a positioning rib is arranged on the inner side of the peripheral wall of the shell, and the rotor is in positioning connection with the positioning rib.

An electric vehicle according to a second aspect of the present utility model includes the in-wheel motor described in the above embodiment.

The electric vehicle provided by the embodiment of the utility model has at least the following beneficial effects:

the hub motor adopts the hub motor of the embodiment of the first aspect, the hub motor is provided with the shell assembly comprising the rim, the shell and the end cover, the rim is arranged outside the peripheral wall of the shell, the end cover is connected with the shell and forms the installation cavity for accommodating the stator and the rotor, the rotor is of a structure with a plurality of iron cores and a plurality of permanent magnets alternately connected along the circumferential direction of the central shaft and is fixedly connected to the inner side of the peripheral wall of the shell, a steel ring in the related art is omitted, the weight reduction of the whole structure is realized, the inner diameter of the installation cavity can be increased, the radial dimension of the rotor is increased, the acting area of the rotor and the stator is increased, the hub motor can output larger torque, and the performance of the hub motor is improved.

Additional aspects and advantages of the utility model 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 utility model.

Drawings

The utility model is further described with reference to the accompanying drawings and examples, in which:

fig. 1 is a schematic structural view of an in-wheel motor according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of the in-wheel motor shown in FIG. 1;

FIG. 3 is an enlarged view of FIG. 2 at A;

FIG. 4 is a schematic view of a hub motor with end caps and stators removed according to an embodiment of the present utility model;

FIG. 5 is a schematic view of a hub motor with end caps, stator and rotor removed according to an embodiment of the present utility model;

fig. 6 is a schematic structural view of a hub motor according to another embodiment of the present utility model;

FIG. 7 is an enlarged view at B in FIG. 6;

fig. 8 is a schematic structural view of a hub motor according to another embodiment of the present utility model;

FIG. 9 is an enlarged view of FIG. 8 at C;

fig. 10 is a schematic structural view of a hub motor according to another embodiment of the present utility model;

fig. 11 is an enlarged view of D in fig. 10.

Reference numerals:

a hub motor 1000;

a bottom bracket 100; a bearing 110;

a housing assembly 200; a rim 210; a clamping table 211; a housing 220; a first bearing housing 221; a peripheral wall 222; positioning ribs 223; a positioning groove 224; a mounting edge 225; a second screw hole 2251; a mounting ear 226; a fixing block 227; a clamping groove 228; an end cap 230; a second bearing seat 231; a third screw hole 232; a mounting cavity 240; a connector 250; a first screw hole 251; a connection block 260; bolt 270

A stator 300;

a rotor 400; a core 410; permanent magnet 420.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the direction or positional relationship indicated with respect to the description of the orientation, such as up, down, etc., is based on the direction or positional relationship shown in the drawings, is merely for convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, plural means two or more. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

Referring to fig. 1, an in-wheel motor 1000 according to an embodiment of the present utility model is a power unit of an electric vehicle, and integrates a power system, a transmission system and a brake system. In the related art, the hub motor 1000 is commonly used in an electric two-wheeled vehicle, which is also called an electric bicycle. In the traditional hub motor 1000, the design that a steel ring is welded on the inner ring of the rim 210 is adopted, the thickness of the steel ring is larger, and more space of the hub motor 1000 is occupied; the steel ring is heavy and occupies about 20% of the whole hub motor 1000, so that the whole weight of the electric bicycle is heavy, riding experience of a user is poor, and the higher requirement of the user on the portability of the electric bicycle is difficult to meet.

In order to improve portability of the electric two-wheeled vehicle, the in-wheel motor 1000 of the embodiment of the present utility model adopts a weight-reduction design. Referring to fig. 2 and 3, an in-wheel motor 1000 according to an embodiment of the present utility model includes a bottom bracket 100 and a housing assembly 200. The bottom bracket 100 is used to attach to the frame of an electric vehicle and serves as a mounting base. The housing assembly 200 is rotatably coupled to the bottom bracket 100, and the housing assembly 200 includes a rim 210, a shell 220, and an end cap 230. The housing 220 is configured as a bowl, the rim 210 is disposed outside the housing 220 and around a peripheral wall 222 of the housing 220, the rim 210 is configured to mount a tire, and as a part of a wheel of an electric vehicle, the rim 210 may be directly fixed to the housing 220 by welding, screwing, glue bonding, interference connection, or the like, or may be indirectly fixed to the housing 220 by using the connection member 250, and a specific connection manner is not limited herein. The housing 220 and the end cover 230 are fixedly connected, for example, by fasteners such as screws, so that a sealed installation cavity 240 is formed by enclosing the housing 220 and the end cover 230, and the center shaft 100 is arranged in the installation cavity 240 in a penetrating manner. The center of one side of the housing 220 away from the end cover 230 is provided with a first bearing seat 221, the center of the end cover 230 is provided with a second bearing seat 231, the two ends of the journal of the middle shaft 100 are respectively provided with a bearing 110, and the two bearings 110 are correspondingly arranged in the first bearing seat 221 and the second bearing seat 231, so that the middle shaft 100 is supported, and the rotation movement between the middle shaft 100 and the shell assembly 200 is more stable.

Referring to fig. 2 and 3, the hub motor 1000 according to the embodiment of the present utility model further includes a stator 300 and a rotor 400, and both the stator 300 and the rotor 400 are positioned in the installation cavity 240, so that good waterproof and dustproof protection can be achieved. The stator 300 is fixedly coupled to the bottom bracket 100 and is positioned between the two bearings 110. The stator 300 may be connected by shrink fitting, welding, screwing, etc., and is not particularly limited herein. Referring to fig. 4, a rotor 400 is mounted inside a peripheral wall 222 of a housing 220, the rotor 400 including a plurality of cores 410 and a plurality of permanent magnets 420, the plurality of cores 410 and the plurality of permanent magnets 420 being alternately connected in a circumferential direction of a central shaft 100 to form a ring-shaped structure. It is understood that the iron core 410 and the permanent magnet 420 may be fixed by glue bonding or by injection molding. Therefore, the rotor 400 has simple structure, simple fixing mode and small assembly difficulty, and is beneficial to improving the production efficiency. In addition, the size of the core 410 and the size of the permanent magnet 420 may be set to be equal or not, and may be designed according to the performance parameters of the in-wheel motor 1000, which is not particularly limited herein.

Referring to fig. 3, it can be understood that, in order to improve the convenience and stability of the installation of the rotor 400, the inside of the peripheral wall 222 of the housing 220 is provided with a positioning rib 223, the positioning rib 223 may be provided in a ring shape, and when the rotor 400 is installed on the peripheral wall 222 of the housing 220, the positioning rib 223 can limit one end of the rotor 400 and limit the installation position of the rotor 400, thereby realizing the rapid assembly of the rotor 400.

Referring to fig. 4 and 5, as another embodiment, a positioning groove 224 may be further disposed inside the peripheral wall 222 of the housing 220, where the positioning groove 224 may be formed by two annular ribs disposed at intervals along the axial direction of the central shaft 100, or may be formed by recessing inside the peripheral wall 222 of the housing 220, which is not specifically limited herein. The rotor 400 is connected to the positioning slots 224, and the plurality of iron cores 410 and the plurality of permanent magnets 420 may be positioned and installed in the positioning slots 224, respectively, thereby achieving rapid assembly of the rotor 400.

Therefore, the hub motor 1000 of the embodiment of the present utility model eliminates the steel ring mounted on the rim 210 and is directly connected to the end cover 230 through the housing 220, thereby realizing weight reduction of the overall structure and facilitating assembly. Under the same volume, the radial dimension of the housing 220 of the hub motor 1000 of the embodiment of the utility model is larger, that is, the radial space of the rotor 400 is increased, the outer diameter of the stator 300 matched with the rotor 400 is correspondingly increased, the acting area of the rotor 400 and the stator 300 is increased, the hub motor 1000 can output larger torque, and the performance of the hub motor 1000 is improved.

Referring to fig. 2, it will be appreciated that the housing 220 is made of a non-magnetically permeable material. For example, the housing 220 may be made of aluminum, plastic, or magnesium aluminum alloy. Since the rotor 400 according to the embodiment of the present utility model does not need to use a magnetically conductive steel ring, the housing 220 does not need to be made of magnetically conductive material, and thus a lighter material than a magnetically conductive material such as steel can be used, thereby further reducing the weight of the hub motor 1000.

Referring to fig. 3, it will be appreciated that the end of the housing 220 facing the end cap 230 is provided with a mounting edge 225, and that the mounting edge 225 may be an annular edge disposed about the perimeter of the port of the housing 220, or a plurality of mounting ears 226 spaced along the perimeter of the port of the housing 220. The housing assembly 200 further includes a connector 250, where the connector 250 is fixedly connected to an end of the rim 210 facing the mounting edge 225, and the connector 250 may be fixedly connected to the rim 210 by welding, glue bonding, or the like; the connector 250 is positioned between the rim 210 and the mounting edge 225. The connector 250 may be a ring-shaped member or a plurality of spaced apart connector blocks 260. The end cover 230, the mounting edge 225 and the connecting member 250 are fixedly connected through the bolts 270, thereby realizing stable connection of the end cover 230, the housing 220 and the rim 210, and enabling the structure of the hub motor 1000 to be more reliable and assembly to be more convenient.

Referring to fig. 3 and 4, it can be appreciated that the connection member 250 includes a plurality of connection blocks 260, the plurality of connection blocks 260 are disposed at intervals along the circumferential direction of the rim 210, the mounting edge 225 includes a plurality of mounting lugs 226, the plurality of mounting lugs 226 are disposed at intervals along the circumferential direction of the rim 210, the plurality of mounting lugs 226 are disposed in one-to-one correspondence with the plurality of connection blocks 260, and the plurality of bolts 270 are respectively inserted into the corresponding positions of the end cover 230, the corresponding mounting lugs 226 and the corresponding connection blocks 260, thereby fixedly connecting the end cover 230, the housing 220 and the rim 210, and thus reducing the weight of the hub motor 1000 while ensuring the connection stability of the hub motor 1000. The mounting lugs 226 and the connecting blocks 260 are uniformly distributed along the circumferential direction of the rim 210, so that the bolts 270 are stressed more uniformly, and the stability and the tightness of the connection of the end cover 230, the shell 220 and the rim 210 are improved.

As another example, it is understood that the connector 250 is annular and the annular connector 250 is disposed about the rim 210. The connecting piece 250 is provided with a plurality of first screw holes 251, the mounting edge 225 is provided with a plurality of second screw holes 2251, the plurality of second screw holes 2251 are arranged in one-to-one correspondence with the plurality of first screw holes 251, the end cover 230 is provided with a plurality of third screw holes 232, the plurality of third screw holes 232 are respectively arranged in correspondence with the plurality of second screw holes 2251, and the bolts 270 sequentially penetrate through the third screw holes 232 and the second screw holes 2251 and are fixedly connected to the first screw holes 251, so that stable connection of the end cover 230, the outer shell 220 and the rim 210 is realized.

Referring to fig. 3, it can be appreciated that the connector 250 is welded to the rim 210 so that the connector 250 and the rim 210 are stably coupled. The lower end of the connecting piece 250 is abutted against the peripheral wall 222 of the housing 220, and the right end of the connecting piece 250 is provided with a screw hole matched with the bolt 270.

Referring to fig. 6 and 7, as another embodiment, it can be appreciated that the connection member 250 is welded to the rim 210, so that the connection member 250 and the rim 210 are stably connected. The lower extreme of rim 210 adopts welding or glue bonding fixed with the perisporium 222 of shell 220, and the lower extreme of connecting piece 250 sets up with the perisporium 222 interval of shell 220, and the right-hand member of connecting piece 250 is equipped with the screw with bolt 270 complex, has reduced the counterpoint degree of difficulty of rim 210 and shell 220, improves the assembly efficiency of rim 210 and shell 220.

As another example, as shown in fig. 8 and 9, it can be understood that the rim 210 is welded to the housing 220, for example, the lower end of the rim 210 is welded to the upper end of the peripheral wall 222, thereby achieving stable connection of the rim 210 and the housing 220. The end of the housing 220 facing the end cap 230 is formed with a fixing block 227, and the fixing block 227 may be integrally formed with the housing 220 or formed by thickening a port of the end of the housing 220 facing the end cap 230. The end cover 230 and the fixing block 227 are fixedly connected through the bolts 270, so that the end cover 230, the housing 220 and the rim 210 are fixedly connected, and the hub motor 1000 is more stably and reliably installed.

Referring to fig. 10 and 11, as another embodiment, it is understood that the rim 210 is fixedly inlaid with the housing 220, and it is understood that the fixedly inlaid may be implemented by injection molding connection or interference connection, and the like, which is not specifically limited herein. The end of the housing 220 facing the end cap 230 is formed with a fixing block 227, and the fixing block 227 may be integrally formed with the housing 220 or formed by thickening a port of the end of the housing 220 facing the end cap 230. The end cover 230 and the fixing block 227 are fixedly connected through the bolts 270, so that the end cover 230, the housing 220 and the rim 210 are fixedly connected, and the hub motor 1000 is more stably and reliably installed.

Referring to fig. 11, it can be understood that the outer side of the peripheral wall 222 of the housing 220 is provided with a clamping groove 228, the lower end of the rim 210 is provided with a clamping table 211, and the clamping table 211 is clamped and positioned with the clamping groove 228, so that the housing 220 and the rim 210 can be more easily fixed through interference connection or injection connection, and the connection stability of the housing 220 and the rim 210 is improved.

An electric vehicle of an embodiment of the present utility model includes the hub motor 1000 of the above embodiment. The electric vehicle according to the embodiment of the present utility model adopts the in-wheel motor 1000 according to the first aspect of the embodiment, the in-wheel motor 1000 is provided with the housing assembly 200 including the rim 210, the housing 220 and the end cover 230, the rim 210 is disposed around the outer side of the peripheral wall 222 of the housing 220, the end cover 230 is connected with the housing 220 and forms the installation cavity 240 for accommodating the stator 300 and the rotor 400, and the rotor 400 is a structure in which the plurality of iron cores 410 and the plurality of permanent magnets 420 are alternately connected along the circumferential direction of the center shaft 100 and fixedly connected to the inner side of the peripheral wall 222 of the housing 220, the steel ring in the related art is eliminated, the weight reduction of the overall structure is realized, and the inner diameter of the installation cavity 240 can be increased, thereby increasing the radial dimension of the rotor 400, increasing the acting area of the rotor 400 and the stator 300, enabling the in-wheel motor 1000 to output a larger torque, and improving the performance of the in-wheel motor 1000.

Since the electric vehicle adopts all the technical solutions of the hub motor 1000 in the above embodiments, at least the technical solutions in the above embodiments have all the beneficial effects, and are not described herein.

The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.

Claims (12)

1. Wheel hub motor, its characterized in that includes:

a center shaft;

the shell assembly is rotationally connected with the center shaft and comprises a rim, a shell and an end cover, wherein the rim is arranged around the peripheral wall of the shell, the end cover is connected with the shell, and a mounting cavity is formed between the end cover and the shell;

the stator is arranged in the mounting cavity and is fixedly connected with the center shaft;

the rotor is arranged in the mounting cavity and comprises a plurality of iron cores and a plurality of permanent magnets, and the iron cores and the permanent magnets are alternately connected along the circumferential direction of the central shaft and fixedly connected to the inner side of the peripheral wall of the shell.

2. The in-wheel motor according to claim 1, wherein: the shell is made of non-magnetic conductive materials.

3. The in-wheel motor according to claim 1 or 2, characterized in that: the shell is towards one end of end cover is equipped with the installation limit, the casing subassembly still includes the connecting piece, connecting piece fixed connection in the rim is towards the one end of installation limit, the end cover the installation limit with connecting piece passes through bolt fixed connection.

4. The in-wheel motor according to claim 3, wherein: the connecting piece includes a plurality of edges the connecting block that the circumference interval of rim set up, the installation limit includes the installation ear that a plurality of intervals set up, a plurality of installation ear with a plurality of the connecting block one-to-one sets up.

5. The in-wheel motor according to claim 3, wherein: the connecting piece is annular and surrounds the rim is arranged, the connecting piece is provided with a plurality of first screw holes, the mounting edge is provided with a plurality of second screw holes, and the second screw holes and the first screw holes are arranged in one-to-one correspondence.

6. The in-wheel motor according to claim 3, wherein: and the connecting piece is fixedly welded with the rim.

7. The in-wheel motor according to claim 6, wherein: the connecting piece is abutted with the peripheral wall of the shell, or the connecting piece is arranged at intervals with the peripheral wall of the shell.

8. The in-wheel motor according to claim 1 or 2, characterized in that: the rim is welded and fixed with the shell, a fixed block is formed at one end of the shell, which faces the end cover, and the end cover is fixedly connected with the fixed block through bolts.

9. The in-wheel motor according to claim 1 or 2, characterized in that: the rim is connected with the shell in an interference mode or through injection molding, a fixed block is formed at one end of the shell, which faces the end cover, and the end cover is fixedly connected with the fixed block through bolts.

10. The in-wheel motor according to claim 9, wherein: the outer side of the peripheral wall of the shell is provided with a clamping groove, and the rim is provided with a clamping table which is clamped with the clamping groove.

11. The in-wheel motor according to claim 1, wherein: the inner side of the peripheral wall of the shell is provided with a positioning rib, and the rotor is in positioning connection with the positioning rib.

12. Electric motor car, its characterized in that: comprising the in-wheel motor of any one of claims 1 to 11.

Images