CN115912725A - Wheel hub motor and electric vehicle - Google Patents

Abstract

The invention 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 rotatably 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 an installation 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 with the middle shaft; the rotor 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 circumferential wall of the shell. The invention realizes the weight reduction of the whole structure by canceling the design of the steel ring, and can increase the inner diameter of the mounting cavity, thereby increasing the radial size of the rotor, increasing the action area of the rotor and the stator, enabling the hub motor to output larger torque and improving the performance of the hub motor.

Description

Wheel hub motor and electric vehicle

Technical Field

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

Background

In the correlation technique, the larger the weight of the hub motor of the electric two-wheel vehicle is, the worse the riding experience of the whole vehicle is. A steel ring with large thickness is welded on an inner ring of a rim of a 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, limiting the improvement of the motor performance.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. To this end, the present invention proposes an in-wheel motor capable of reducing weight and improving performance.

The invention further provides an electric vehicle with the hub motor.

According to an embodiment of the first aspect of the invention, the hub motor comprises: a middle shaft; the shell assembly is rotatably connected with the middle shaft and 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 is arranged in the mounting cavity and fixedly connected to the middle 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 in the circumferential direction of the central shaft and fixedly connected to the inner side of the circumferential wall of the shell.

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

through setting up including the rim, the casing subassembly that shell and end cover formed, the rim sets up around the perisporium outside of shell, the end cover is connected with the shell and forms the installation cavity that holds stator and rotor, and the rotor is the structure and fixed connection inboard in the perisporium of shell that a plurality of iron cores and a plurality of permanent magnet connect along centraxonial circumference in turn, the steel ring among the correlation technique has been cancelled, the weight that subtracts of overall structure has been realized, and the internal diameter of installation cavity can be increased, thereby increase the radial dimension of rotor, make the active area increase of rotor and stator, make in-wheel motor can export bigger moment of torsion, improve in-wheel motor's performance.

According to some embodiments of the invention, the housing is made of a non-magnetically conductive material.

According to some embodiments of the invention, the end of the outer shell facing the end cap is provided with a mounting edge, the shell assembly further comprises a connecting piece fixedly connected to the end of the rim facing the mounting edge, and the end cap, the mounting edge and the connecting piece are fixedly connected by bolts.

According to some embodiments of the invention, 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 and the plurality of connecting blocks are arranged in a one-to-one correspondence manner.

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

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

According to some embodiments of the invention, the connector abuts the peripheral wall of the housing or the connector is spaced from the peripheral wall of the housing.

According to some embodiments of the invention, the rim is fixed to the housing by welding, a fixing block is formed at one end of the housing facing the end cover, and the end cover and the fixing block are fixedly connected through bolts.

According to some embodiments of the invention, the rim is connected with the housing in an interference manner or through injection molding, a fixing block is formed at one end of the housing facing the end cover, and the end cover and the fixing block are fixedly connected through bolts.

According to some embodiments of the invention, a clamping groove is formed on the outer side of the peripheral wall of the shell, and the rim is provided with a clamping platform clamped with the clamping groove.

According to some embodiments of the invention, the housing is provided with a positioning rib inside the circumferential wall, and the rotor is connected with the positioning rib in a positioning way.

According to the second aspect embodiment of the invention, the electric vehicle comprises the hub motor.

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

adopt the in-wheel motor of first aspect embodiment, in-wheel motor is through setting up the casing subassembly that includes the rim, shell and end cover formed, the rim sets up around the perisporium outside of shell, the end cover is connected with the shell and forms the installation cavity that holds stator and rotor, and the rotor is the structure and fixed connection inboard in the perisporium of shell that a plurality of iron cores and a plurality of permanent magnet connect along centraxonial circumference in turn, the steel ring among the correlation technique has been cancelled, the weight that has realized overall structure subtracts, and can increase the internal diameter of installation cavity, thereby increase the radial dimension of rotor, make the active area increase of rotor and stator, make in-wheel motor can output bigger moment of torsion, improve in-wheel motor's performance.

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.

Drawings

The invention is further described with reference to the following figures and examples, in which:

fig. 1 is a schematic structural diagram of a hub motor according to an embodiment of the present invention;

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

FIG. 3 is an enlarged view taken at A in FIG. 2;

FIG. 4 is a schematic structural view of a hub motor according to an embodiment of the present invention, wherein the end caps and the stator are removed;

FIG. 5 is a schematic structural view of an in-wheel motor according to an embodiment of the present invention, wherein the end cap, stator and rotor are removed;

FIG. 6 is a schematic structural diagram of a hub motor according to another embodiment of the present invention;

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

FIG. 8 is a schematic structural diagram of a hub motor according to another embodiment of the present invention;

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

FIG. 10 is a schematic structural diagram of a hub motor according to another embodiment of the present invention;

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

Reference numerals:

a hub motor 1000;

a central axis 100; a bearing 110;

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

A stator 300;

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

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation descriptions, such as the orientation or positional relationship indicated by upper, lower, etc., are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention.

In the description of the present invention, a plurality means two or more. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood 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 invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

Referring to fig. 1, an in-wheel motor 1000 according to an embodiment of the present invention 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 in-wheel motor 1000 is generally used in an electric motorcycle, which is also referred to as an electric bicycle. In the conventional in-wheel motor 1000, a steel ring is welded on the inner ring of the rim 210, so that the steel ring has a large thickness and occupies more space of the in-wheel motor 1000; and the weight of steel ring is great, accounts for about 20% of the weight of whole in-wheel motor 1000, consequently leads to electric bicycle's whole weight big, and user's experience of riding is felt relatively poor, is difficult to satisfy the user to electric bicycle's the higher requirement of portability.

In order to improve the portability of the electric two-wheeled vehicle, the in-wheel motor 1000 of the embodiment of the invention adopts a weight-reduction design. Referring to fig. 2 and 3, an in-wheel motor 1000 according to an embodiment of the present invention includes a middle shaft 100 and a housing assembly 200. The bottom bracket 100 is used for connecting the frame of the electric vehicle and is used as a mounting base. A housing assembly 200 is rotatably connected to the central axle 100, the housing assembly 200 including a rim 210, an outer shell 220, and an end cap 230. The housing 220 is configured in a bowl shape, the rim 210 is disposed outside the housing 220 and around a peripheral wall 222 of the housing 220, the rim 210 is used for mounting a tire, as a part of a wheel of an electric vehicle, and 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 connecting member 250, where the specific connection manner is not limited herein. The outer shell 220 and the end cap 230 are fixedly connected, for example, by fasteners such as screws, so that a sealed installation cavity 240 is defined between the outer shell 220 and the end cap 230, and the middle shaft 100 is inserted into the installation cavity 240. The center of the side of the outer shell 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, 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 rotary motion between the middle shaft 100 and the shell assembly 200 is more stable.

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

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 positioning rib 223 is disposed inside the peripheral wall 222 of the housing 220, and the positioning rib 223 may be annular, so that 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 achieving the rapid assembly of the rotor 400.

Referring to fig. 4 and 5, as another embodiment, the inside of the peripheral wall 222 of the housing 220 may further be provided with positioning grooves 224, and the positioning grooves 224 may be formed by two annular ribs arranged at intervals along the axial direction of the central shaft 100, or may be formed by being recessed inside the peripheral wall 222 of the housing 220, and are not limited in detail here. The rotor 400 is coupled in the positioning groove 224, and the plurality of cores 410 and the plurality of permanent magnets 420 may be respectively positioned and mounted in the positioning groove 224, thereby achieving a rapid assembly of the rotor 400.

Therefore, the in-wheel motor 1000 according to the embodiment of the present invention eliminates the steel ring mounted on the rim 210, and is directly connected to the end cap 230 through the casing 220, thereby reducing the weight of the overall structure and facilitating the assembly. Under the same volume, the radial size of the housing 220 of the in-wheel motor 1000 according to the embodiment of the present invention is larger, that is, the radial space of the rotor 400 is increased, so that the outer diameter of the rotor 400 is increased, and the outer diameter of the stator 300 matched with the rotor 400 is also correspondingly increased, so that the effective areas of the rotor 400 and the stator 300 are increased, and the in-wheel motor 1000 can output a larger torque, thereby improving the performance of the in-wheel motor 1000.

Referring to fig. 2, it will be appreciated that the housing 220 is made of a non-magnetic material. For example, the housing 220 may be made of aluminum, plastic, or magnesium aluminum alloy. Because the rotor 400 structure of the embodiment of the present invention does not need to use a magnetic conductive steel ring, the housing 220 does not need to be made of a magnetic conductive material, and therefore, a material lighter than a magnetic conductive material such as steel material can be used, thereby further reducing the weight of the in-wheel 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 rim 225, and the mounting rim 225 may be an annular rim disposed around 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 shell assembly 200 further comprises a connecting member 250, the connecting member 250 is fixedly connected to one end of the rim 210 facing the mounting edge 225, and the connecting member 250 can be fixedly connected to the rim 210 by welding, glue bonding, or the like; a connecting member 250 is positioned between the rim 210 and the mounting edge 225. The connecting member 250 may be a ring-like member or a plurality of spaced-apart connecting blocks 260. The end cap 230, the mounting edge 225 and the connecting member 250 are fixedly connected by bolts 270, so that the end cap 230, the housing 220 and the rim 210 are stably connected, the structure of the in-wheel motor 1000 is more reliable, and the assembly is more convenient.

Referring to fig. 3 and 4, it can be understood that the connecting member 250 includes a plurality of connecting blocks 260, the plurality of connecting blocks 260 are arranged along the circumferential direction of the rim 210 at intervals, the mounting edge 225 includes a plurality of mounting lugs 226, the plurality of mounting lugs 226 are arranged along the circumferential direction of the rim 210 at intervals, the plurality of mounting lugs 226 and the plurality of connecting blocks 260 are arranged in a one-to-one correspondence manner, and a plurality of bolts 270 are respectively inserted into the corresponding positions of the end covers 230, the corresponding mounting lugs 226 and the corresponding connecting blocks 260, so as to fixedly connect the end covers 230, the housing 220 and the rim 210, thereby ensuring the connection stability of the in-wheel motor 1000 and reducing the weight of the in-wheel 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 stress of the bolts 270 is more uniform, and the connection stability and the connection tightness of the end cover 230, the shell 220 and the rim 210 are further improved.

As another example, it is understood that the connector 250 is annular, and the annular connector 250 is disposed around the rim 210. Connecting piece 250 is equipped with a plurality of first screw holes 251, installation limit 225 is equipped with a plurality of second screw holes 2251, a plurality of second screw holes 2251 set up with a plurality of first screw holes 251 one-to-one, end cover 230 is equipped with a plurality of third screw holes 232, a plurality of third screw holes 232 correspond the setting with a plurality of second screw holes 2251 respectively, third screw hole 232 is worn to locate in proper order by bolt 270, second screw hole 2251, and fixed connection is in first screw hole 251, thereby realize end cover 230, shell 220 and rim 210's stable connection.

Referring to fig. 3, it can be understood that the connecting member 250 is welded to the rim 210, thereby stably connecting the connecting member 250 to the rim 210. The lower end of the connecting piece 250 abuts against the peripheral wall 222 of the shell 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 understood that the connecting member 250 is welded to the rim 210, thereby achieving stable connection between the connecting member 250 and the rim 210. The lower end of the rim 210 and the peripheral wall 222 of the shell 220 are fixed by welding or glue bonding, the lower end of the connecting piece 250 and the peripheral wall 222 of the shell 220 are arranged at intervals, and the right end of the connecting piece 250 is provided with a screw hole matched with the bolt 270, so that the alignment difficulty of the rim 210 and the shell 220 is reduced, and the assembly efficiency of the rim 210 and the shell 220 is improved.

Referring to fig. 8 and 9, as another embodiment, 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 between 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 shell 220 and the rim 210 are fixedly connected, and the in-wheel motor 1000 is more stably and reliably mounted.

Referring to fig. 10 and 11, as another embodiment, it is understood that the rim 210 is insert-fixed to the housing 220, and it is understood that the insert-fixing may be achieved by injection molding or interference connection, and is not limited in detail 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 shell 220 and the rim 210 are fixedly connected, and the in-wheel motor 1000 is more stably and reliably mounted.

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

An electric vehicle according to an embodiment of the present invention includes the in-wheel motor 1000 according to the above embodiment. The electric vehicle of the embodiment of the invention adopts the in-wheel motor 1000 of the first aspect embodiment, the in-wheel motor 1000 is provided with the shell assembly 200 formed by the rim 210, the shell 220 and the end cover 230, the rim 210 is arranged around the outer side of the peripheral wall 222 of the shell 220, the end cover 230 is connected with the shell 220 and forms the installation cavity 240 for accommodating the stator 300 and the rotor 400, the rotor 400 is a structure in which a plurality of iron cores 410 and a plurality of permanent magnets 420 are alternately connected along the circumferential direction of the central shaft 100 and is fixedly connected to the inner side of the peripheral wall 222 of the shell 220, a steel ring in the related technology is omitted, the weight reduction of the whole structure is realized, the inner diameter of the installation cavity 240 can be increased, the radial size of the rotor 400 is increased, the action areas of the rotor 400 and the stator 300 are increased, the in-wheel motor 1000 can output larger torque, and the performance of the in-wheel motor 1000 is improved.

Since the electric vehicle adopts all the technical solutions of the in-wheel motor 1000 of the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims (12)

1. In-wheel motor, its characterized in that includes:

a middle shaft;

the shell assembly is rotatably connected with the middle shaft and 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 an installation cavity is formed between the end cover and the shell;

the stator is arranged in the mounting cavity and fixedly connected to the middle 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 in the circumferential direction of the central shaft and fixedly connected to the inner side of the circumferential wall of the shell.

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

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

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

5. The in-wheel motor of claim 3, wherein: the connecting piece is annular and centers on the rim sets up, the connecting piece is equipped with a plurality of first screw, the installation limit is equipped with a plurality of second screw, and is a plurality of the second screw sets up with a plurality of first screw one-to-one.

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

7. The in-wheel motor of claim 6, wherein: the connecting piece is abutted against 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, wherein: the rim is welded and fixed with the shell, a fixing block is formed at one end, facing the end cover, of the shell, and the end cover is fixedly connected with the fixing block through bolts.

9. The in-wheel motor according to claim 1 or 2, wherein: the rim with interference connection or through moulding plastics the connection between the shell, the shell orientation the one end of end cover is formed with the fixed block, the end cover with the fixed block passes through bolt fixed connection.

10. The in-wheel motor of 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 clamped with the clamping groove.

11. The in-wheel motor of claim 1, wherein: and a positioning rib is arranged on the inner side of the peripheral wall of the shell, and the rotor is connected with the positioning rib in a positioning way.

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

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