Rotor assembly, wheel hub motor and wheel

Abstract

The application provides a rotor assembly, a wheel hub motor and a wheel, and the rotor assembly comprises a rotor body, a rotor shell, a heat dissipation fin and a mounting piece, the rotor body is connected with the rotor shell, and the heat dissipation fin is connected with the mounting piece; the mounting piece is connected with the rotor body and is fixed relative to the rotor body in the circumferential direction of the rotor body, and the heat dissipation fin and the mounting piece can rotate with the rotation of the rotor body. The wheel hub motor has high heat dissipation efficiency and long service life.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a rotor assembly, a wheel hub motor and a wheel. BACKGROUND

[0002] The wheel hub motor is generally an outer rotor motor. By fixing the rotor and the wheel, the wheel is directly driven to rotate when the rotor rotates, so as to omit the transmission mechanism. The rotor assembly of the wheel hub motor is sleeved outside the stator assembly. A large amount of heat is generated after the winding of the stator assembly is electrified.

[0003] It is found through research that the existing wheel hub motor has the following shortcomings:

[0004] 1. Water cooling is adopted, and a water cooling device needs to be added in the original motor, which increases the weight and volume of the motor, reduces the power density of the motor, and the waterway design of the heat dissipation system is complex, and there is a possibility of water leakage;

[0005] 2. Natural air cooling design is adopted. Since the space of the wheel hub motor is small, and the heat generating part (i.e. the stator part) is located inside the motor, it is difficult to conduct heat to the outside, and it is difficult to run at high power for a long time. SUMMARY

[0006] The purpose of the present application is to provide a rotor assembly, a wheel hub motor and a wheel, which can improve the heat conduction efficiency and thus improve the heat dissipation efficiency of the wheel hub motor.

[0007] The embodiments of the present application are implemented as follows:

[0008] In a first aspect, the embodiments of the present application provide a rotor assembly, comprising:

[0009] The rotor body, the rotor shell, the heat dissipation fin and the mounting piece are connected, the mounting piece and the rotor body are fixed relative to each other in the circumferential direction of the rotor body, and the heat dissipation fin and the mounting piece rotate with the rotation of the rotor body.

[0010] In an optional embodiment, the heat dissipation fin is in contact with the inner side wall of the rotor shell.

[0011] In an optional embodiment, the mounting piece is sleeved outside the rotor body.

[0012] In an optional embodiment, the mounting piece has a first cylinder segment and a second cylinder segment, one end of the first cylinder segment is connected to one end of the second cylinder segment, and the first cylinder segment is sleeved outside the rotor body; the second cylinder segment is a conical structure, the inner diameter and the outer diameter of the second cylinder segment gradually decrease in the direction from the first cylinder segment to the second cylinder segment; and the heat dissipation fin is mounted on the outer cylinder wall of the first cylinder segment and / or the second cylinder segment.

[0013] In an optional embodiment, the number of the heat dissipation fins is multiple, the multiple heat dissipation fins are connected with the mounting member, and are arranged in a circumferential direction of the mounting member.

[0014] In an optional embodiment, the mounting member is detachably connected with the rotor body.

[0015] In an optional embodiment, the heat dissipation fins are welded with the mounting member.

[0016] In an optional embodiment, the heat dissipation fins are arc-shaped fins.

[0017] In a second aspect, an embodiment of the present application provides a wheel hub motor, which comprises:

[0018] The rotor assembly of any one of the preceding embodiments.

[0019] In a third aspect, an embodiment of the present application provides a wheel, which comprises:

[0020] The wheel hub motor of the preceding embodiment.

[0021] The beneficial effects of the embodiment of the present application are as follows:

[0022] In summary, the rotor assembly provided by the embodiment is characterized in that: the mounting member is arranged on the rotor body, and the heat dissipation fins are arranged on the mounting member; when the rotor assembly rotates relative to the stator assembly, the heat dissipation fins rotate relative to the stator assembly; the heat generated between the stator assembly and the rotor assembly is transmitted to the rotor body through the stator shaft of the stator assembly, then transmitted to the mounting member through the rotor body, and finally transmitted to the heat dissipation fins; due to the arrangement of the heat dissipation fins, the efficiency of heat conduction from the inside of the motor to the rotor shell is improved, thereby improving the heat dissipation efficiency; meanwhile, when the heat dissipation fins rotate with the rotor body, the air flow is accelerated under the action of the heat dissipation fins, so that the air flow in the motor shell is accelerated, thereby improving the heat dissipation efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor.

[0024] Figure 1 FIG. 1 is a structural schematic diagram of a rotor assembly according to an embodiment of the present application;

[0025] Figure 2 FIG. 2 is a structural schematic diagram of a rotor body and a rotor shell according to an embodiment of the present application;

[0026] Figure 3Structure diagram of the heat dissipation fin and the mounting piece of the embodiment of the present application;

[0027] Figure 4 Front view of the heat dissipation fin and the mounting piece of the embodiment of the present application.

[0028] Icon:

[0029] 100-rotor assembly; 110-rotor body; 120-rotor shell; 121-bottom plate; 122-enclosure plate; 123-inner side wall; 130-heat dissipation fin; 131-outer side edge; 140-mounting piece; 141-first cylinder segment; 142-second cylinder segment. DETAILED DESCRIPTION

[0030] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0032] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0033] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0034] In addition, the terms "horizontal", "vertical", and the like, do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0035] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0036] Please refer to Figures 1-4 The rotor assembly 100 provided by the embodiment can be applied to a wheel hub motor. When the rotor assembly 100 rotates, wind power can be formed in the shell of the wheel hub motor, so as to accelerate air flow, improve the heat dissipation efficiency of the wheel hub motor, make the working environment of the wheel hub motor good, and prolong the service life of the wheel hub motor.

[0037] It should be understood that the rotor assembly 100 can also be applied to other types of motors.

[0038] Please refer to Figure 1 In the embodiment, the rotor assembly 100 includes a rotor body 110, a rotor shell 120, a heat dissipation fin 130, and a mounting piece 140. The rotor body 110 is connected with the rotor shell 120, and the heat dissipation fin 130 is connected with the mounting piece 140. The mounting piece 140 is connected with the rotor body 110 and is fixed relative to the rotor body 110 in the circumferential direction of the rotor body 110. The heat dissipation fin 130 and the mounting piece 140 can rotate with the rotor body 110.

[0039] The rotor assembly 100 provided by the embodiment is provided with the mounting piece 140 on the rotor main body 110, and the heat dissipation fins 130 are arranged on the mounting piece 140. When the rotor assembly 100 rotates relative to the stator assembly, the heat dissipation fins 130 rotate relative to the stator assembly. The heat generated between the stator assembly and the rotor assembly 100 is transmitted to the rotor main body 110 through the stator shaft of the stator assembly, then transmitted to the mounting piece 140 through the rotor main body 110, and finally transmitted to the heat dissipation fins 130. Due to the arrangement of the heat dissipation fins 130, the efficiency of heat conduction from the inside of the motor to the rotor shell 120 is improved, thereby improving the heat dissipation efficiency. At the same time, when the heat dissipation fins 130 rotate with the rotor main body 110, the air flow is accelerated under the action of the heat dissipation fins 130, so that the air flow in the motor shell is generated, and the heat dissipation efficiency is also improved. At the same time, the heat dissipation fins 130 are mounted on the mounting piece 140, and then mounted on the rotor main body 110 through the mounting piece 140. The heat dissipation fins 130 and the mounting piece 140 can be made into a complete set and directly matched with different models of rotor main bodies 110, thereby improving the assembly efficiency.

[0040] In the embodiment, the rotor main body 110 is provided with a through hole for inserting the stator shaft, and the cross section of the rotor main body 110 is substantially annular. The cross section of the rotor main body 110 refers to a plane perpendicular to the axis of the rotor main body 110.

[0041] Please refer to Figure 2 Optionally, the rotor shell 120 has a bottom plate 121 and a surrounding plate 122. The surrounding plate 122 extends annularly around the axis of the bottom plate 121, and the surrounding plate 122 is connected to the peripheral surface of the bottom plate 121. The bottom plate 121 and the surrounding plate 122 jointly form a circular groove structure, and the end of the surrounding plate 122 away from the bottom plate 121 forms a notch. The bottom plate 121 can be a circular plate, and the rotor main body 110 is fixed on the bottom plate 121 and located in the area surrounded by the surrounding plate 122. Further, the rotor main body 110 and the bottom plate 121 are coaxially arranged.

[0042] It should be noted that the bottom plate 121 and the surrounding plate 122 can be integrally formed. For example, the bottom plate 121 and the surrounding plate 122 are processed by stretching.

[0043] Optionally, the bottom plate 121 is provided with a through hole at the middle position.

[0044] Optionally, the rotor main body 110 is a cylindrical structure, and the rotor main body 110 can be a cylindrical tube. The cylindrical cavity of the rotor main body 110 is in communication with the through hole of the bottom plate 121 and coaxial.

[0045] Optionally, the rotor body 110 is integrally formed with the rotor shell 120. The rotor shell 120 and the rotor body 110 have high structural strength and are not easy to deform, thus having a long service life.

[0046] Please refer to Figure 3 and Figure 4 In the embodiment, the mounting member 140 is in a cylindrical structure, and the mounting member 140 is provided with an inner hole. The mounting member 140 is sleeved on the outer side of the rotor body 110 through the inner hole. After the mounting member 140 is sleeved on the outer side of the rotor body 110, the mounting member 140 is fixed relative to the rotor body 110 in the circumferential direction of the rotor body 110, that is, the mounting member 140 can rotate with the rotor body 110. Optionally, the mounting member 140 and the rotor body 110 can be connected by a key, or the mounting member 140 and the rotor body 110 are connected by an interference fit.

[0047] Optionally, the mounting member 140 includes a first cylinder segment 141 and a second cylinder segment 142. One end of the first cylinder segment 141 is connected to one end of the second cylinder segment 142, and the two are in communication with each other. The first cylinder segment 141 and the second cylinder segment 142 are coaxially arranged.

[0048] Further, the first cylinder segment 141 can be a cylindrical cylinder, and the second cylinder segment 142 can be a conical cylinder. The inner diameter and the outer diameter of the second cylinder segment 142 gradually decrease in the direction from the first cylinder segment 141 to the second cylinder segment 142. The inner diameter of the connection between the second cylinder segment 142 and the first cylinder segment 141 is equal to the inner diameter of the first cylinder segment 141. The minimum inner diameter of the second cylinder segment 142 is not less than the inner diameter of the rotor body 110, so that the second cylinder segment 142 does not interfere with the stator shaft and is not easy to affect the assembly of the stator shaft and the rotor body 110.

[0049] In the embodiment, the heat dissipation fins 130 are assembled on the outer cylinder wall of the mounting member 140. The number of the heat dissipation fins 130 can be multiple. The multiple heat dissipation fins 130 are uniformly and spacedly arranged on the outer cylinder wall of the mounting member 140. Optionally, each heat dissipation fin 130 can be an arc-shaped fin, so that the component force is more concentrated and the heat dissipation efficiency is improved.

[0050] Optionally, the heat dissipation fins 130 can be connected with the first cylinder segment 141 and / or the second cylinder segment 142.

[0051] It should be noted that the heat dissipation fins 130 and the first cylinder segment 141 and / or the second cylinder segment 142 can be fixed by welding.

[0052] In the embodiment, the heat dissipation fins 130 are connected with the first cylinder segment 141 and the second cylinder segment 142 at the same time, the contact area between the heat dissipation fins 130 and the mounting piece 140 is large, the connection structure is firm, and the heat dissipation fins 130 are not easy to be separated, which is safe and reliable in use; at the same time, the heat dissipation fins 130 extend from the first cylinder segment 141 to the second cylinder segment 142, the length of the heat dissipation fins 130 is longer, and the heat dissipation fins 130 can provide greater wind power. In addition, when the mounting piece 140 is installed with the rotor body 110, the first cylinder segment 141 is connected with the rotor body 110, and since the first cylinder segment 141 and the second cylinder segment 142 form a bending structure at the connection position, the bending structure can limit the depth of the first cylinder segment 141 inserted into the rotor body 110, so as to avoid that the first cylinder segment 141 is excessively contacted with the bottom plate 121 when being inserted, and the bottom plate 121 is deformed, which affects the normal work of the rotor shell 120. Further, the second cylinder segment 142 is in a conical structure, and the outer peripheral wall of the second cylinder segment 142 is inclined from inside to outside, when the heat dissipation fins 130 with the same width are installed, the distance between the outer side edge 131 of the heat dissipation fins 130 and the axis of the second cylinder segment 142 is small, wherein the width of the heat dissipation fins 130 extends along the radial direction of the rotor body 110; the outer side edge 131 of the heat dissipation fins 130 refers to the side edge of the heat dissipation fins 130 away from the second cylinder segment 142 in the width direction of the heat dissipation fins 130, in other words, the part of the heat dissipation fins 130 located on the second cylinder segment 142 is closer to the axis of the rotor body 110, and when the heat dissipation fins 130 rotate with the rotor body 110, the centrifugal force generated by the heat dissipation fins 130 is small, which has little effect on the rotation stability of the rotor body 110, and is not easy to affect the normal work of the wheel hub motor.

[0053] Optionally, one side of the heat dissipation fins 130 is in contact with the inner side wall 123 of the bottom plate 121, and the heat dissipation fins 130 can directly conduct heat to the bottom plate 121, thereby further improving the efficiency of heat conduction from the motor to the rotor shell 120 through the heat dissipation fins 130, and further improving the heat dissipation efficiency.

[0054] The rotor assembly 100 provided by the embodiment is characterized in that the heat dissipation fins 130 are mounted on the rotor body 110 by the mounting member 140, one side of the heat dissipation fins 130 is connected with the mounting member 140, and the heat dissipation fins 130 have no overhanging part and are not prone to deformation and abnormal sound in use. When the stator shaft passes through the second cylinder segment 142 and is matched with the inner hole of the rotor body 110, the second cylinder segment 142 can be in contact with the stator shaft, so that the heat generated on the stator shaft is transmitted to the heat dissipation fins 130 through the mounting member 140. Since the heat dissipation fins 130 have a large contact area with air, the heat dissipation efficiency can be improved through the heat dissipation fins 130. The heat dissipation fins 130 are in contact with the rotor shell 120, and part of the heat can be conducted to the rotor shell 120, so that the heat dissipation effect is enhanced through the rotor shell 120. At the same time, the heat dissipation fins 130 rotate with the rotor body 110, and the air flow is accelerated when the heat dissipation fins 130 rotate, so that the heat dissipation efficiency is further improved. During the operation of the motor, a large amount of heat generated by the winding can be quickly conducted to the external environment through the heat dissipation fins 130, the rotor shell 120 and the air flow generated when the heat dissipation fins 130 rotate, so that the heat dissipation effect of the motor is good, thereby slowing down the phenomenon of excessively high local temperature during the operation of the motor, the working environment of the motor is good, and the motor works more stably and reliably.

[0055] The embodiment also provides a wheel hub motor including the rotor assembly 100, and the wheel hub motor has good heat dissipation effect and works safely and reliably.

[0056] The embodiment also provides a wheel including the wheel hub motor, the rotor assembly 100 of the wheel hub motor is connected with a wheel body of the wheel, and the rotor assembly 100 drives the wheel body to rotate when the rotor assembly 100 rotates. The wheel has good heat dissipation effect inside and works safely and reliably.

[0057] The above merely provides preferred embodiments of the present application but should not be used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A rotor assembly characterized by, It comprises: A rotor body, a rotor shell, a heat dissipation fin and a mounting piece, the rotor body is connected with the rotor shell, the heat dissipation fin is connected with the mounting piece; the mounting piece is connected with the rotor body and both are fixed opposite in the circumferential direction of the rotor body, the heat dissipation fin and the mounting piece can rotate with the rotation of the rotor body; The heat dissipation fin is in contact with the inner side wall of the rotor shell; The mounting piece is sleeved outside the rotor body; The mounting piece has a first cylinder segment and a second cylinder segment, one end of the first cylinder segment is connected with one end of the second cylinder segment, the first cylinder segment is sleeved outside the rotor body; the second cylinder segment is a conical structure, the inner diameter and the outer diameter of the second cylinder segment gradually decrease in the direction from the first cylinder segment to the second cylinder segment; the heat dissipation fin extends from the first cylinder segment to the second cylinder segment and is mounted on the outer cylinder wall of the first cylinder segment and the second cylinder segment.

2. The rotor assembly according to claim 1, wherein: The number of the heat dissipation fins is multiple, multiple heat dissipation fins are connected with the mounting piece and are arranged in the circumferential direction of the mounting piece.

3. The rotor assembly according to claim 1, wherein: The mounting piece is detachably connected with the rotor body.

4. The rotor assembly according to claim 1, wherein: The heat dissipation fin is welded with the mounting piece.

5. The rotor assembly according to claim 1, wherein: The heat dissipation fin is an arc-shaped fin.

6. A wheel hub motor characterized by The wheel hub motor comprises: The rotor assembly according to any one of claims 1-5.

7. A vehicle wheel, characterised in that The wheel comprises: The wheel hub motor according to claim 6.

Images