Hub motor and vehicle

Abstract

The utility model provides a hub motor, which comprises a motor stator, a motor rotor and a hub motor cover, and is characterized in that the motor rotor is rotatably sleeved on the motor stator; the hub motor cover comprises a motor cover body and an expansion piece, the motor cover body is connected to the side portion of the motor rotor, the expansion piece is connected between the motor cover body and the motor rotor in a sealed mode, and an expansion cavity is formed in the side, facing the expansion piece, of the motor cover body. And the air pressure in the inner cavity of the hub motor is increased, so that the expansion piece expands towards the expansion cavity, and the air pressure in the inner cavity of the hub motor is reduced. The utility model also provides a vehicle provided with the hub motor.

Description

Technical Field

[0001] The utility model relates to vehicle accessories, in particular to a wheel hub motor and a vehicle provided with the wheel hub motor. Background Art

[0002] The inside of the hub motor will generate heat when it is running. The metal shell of the hub motor in the prior art cannot expand, which causes the internal air pressure of the hub motor to be too high and urges the sealing ring of the hub motor to exhaust air, causing the sealing ring of the hub motor to deform and reduce the sealing function; when the hub motor stops running, the internal temperature of the hub motor will gradually decrease, causing the internal air pressure of the hub motor to decrease to less than the external air pressure, making it easy for external water, water vapor or dust to enter the interior of the hub motor, causing damage such as internal corrosion of the hub motor. Utility Model Content

[0003] The present application provides a wheel hub motor, the wheel hub motor comprising:

[0004] Motor stator;

[0005] a motor rotor, the motor rotor being rotatably sleeved on the motor stator; and

[0006] A wheel hub motor cover, the wheel hub motor cover comprises a motor cover body and an expansion piece, the motor cover body is connected to the side of the motor rotor, the expansion piece is sealingly connected between the motor cover body and the motor rotor, and an expansion cavity is provided on the side of the motor cover body facing the expansion piece; the increase in air pressure in the inner cavity of the wheel hub motor can cause the expansion piece to expand toward the expansion cavity to reduce the air pressure in the inner cavity of the wheel hub motor.

[0007] In some embodiments, a plurality of expansion cavities are provided on the motor cover body, the plurality of expansion cavities are arranged along the circumference of the motor rotor, the expansion member is sealed and covers the plurality of expansion cavities, and the expansion member can expand toward the plurality of expansion cavities respectively.

[0008] In some embodiments, the hub motor cover further includes a positioning member, the positioning member layer is attached to a side of the expansion member facing the motor rotor, the positioning member is fixedly connected to the motor cover body, and the expansion member is clamped between the motor cover body and the positioning member.

[0009] In some embodiments, a plurality of first air cavities are provided on the positioning member, the plurality of first air cavities are arranged along the circumference of the motor rotor, and the plurality of first air cavities are respectively opposite to the plurality of expansion cavities.

[0010] In some embodiments, a first installation space is provided on the side of the motor cover body facing the motor rotor, a plurality of expansion chambers are connected to the first installation space, and the expansion member and the positioning member are positioned in the first installation space.

[0011] In some embodiments, the expansion chamber passes through two opposite side surfaces of the motor cover body, and the hub motor cover also includes a protective member, which is connected to the side of the motor cover body facing away from the motor rotor, and a first heat dissipation hole is provided on the protective member, and the first heat dissipation hole is connected to the expansion chamber.

[0012] In some embodiments, a second installation space is provided on the side of the motor cover body facing away from the motor rotor, and the protective member is positioned in the second installation space; a support bar is provided between two adjacent expansion chambers of the motor cover body, and the support bar is provided with a first heat dissipation groove connected to the second installation space.

[0013] In some embodiments, a protective plate is provided on a side of the motor cover body facing away from the expansion member, the protective plate covers the expansion cavity, and the protective plate defines a second heat dissipation hole connected to the expansion cavity.

[0014] In some embodiments, a plurality of heat dissipation cavities are provided on the side of the motor cover body facing away from the expansion member, the plurality of heat dissipation cavities are arranged along the circumference of the motor rotor, the plurality of heat dissipation cavities are respectively offset from the plurality of expansion cavities, and one side of the heat dissipation cavity is close to the side of the motor cover body facing the expansion member.

[0015] In some embodiments, a plurality of heat dissipation cavities are evenly arranged along the circumference of the motor rotor, a plurality of expansion cavities are evenly arranged along the circumference of the motor rotor, and each heat dissipation cavity is located between two adjacent expansion cavities; a plurality of heat dissipation fins are arranged in the heat dissipation cavity, and the plurality of heat dissipation fins are spaced apart from each other.

[0016] In some embodiments, the expansion member includes a plurality of expansion sheets, which are respectively sealed and covered on the plurality of expansion cavities; the positioning member includes a plurality of positioning sheets, which are respectively attached to the side of the plurality of expansion sheets away from the motor cover body, and each positioning sheet is connected to the motor cover body; a second air cavity is opened on the positioning sheet, and the second air cavity is opposite to the expansion cavity.

[0017] In some embodiments, the wheel hub motor cover is respectively connected to the opposite sides of the motor rotor, and the motor cover body is provided with an axial hole along the axis of the motor rotor; the motor stator includes a motor shaft, and the opposite ends of the motor shaft respectively extend out of the opposite sides of the motor stator, and the opposite ends of the motor shaft are respectively passed through the axial holes of the two motor cover bodies; the wheel hub motor cover also includes a wheel hub oil seal, which is sealingly sleeved on the motor shaft and sealingly positioned on the motor cover body.

[0018] The present application also provides a vehicle, which includes a chassis and a wheel hub motor, wherein the wheel hub motor includes a motor stator, a motor rotor and a wheel hub motor cover, wherein the motor rotor is rotatably mounted on the motor stator; the wheel hub motor cover includes a motor cover body and an expansion piece, wherein the motor cover body is connected to the side of the motor rotor, the expansion piece is sealingly connected between the motor cover body and the motor rotor, and an expansion cavity is provided on the side of the motor cover body facing the expansion piece; an increase in air pressure in the inner cavity of the wheel hub motor can cause the expansion piece to expand toward the expansion cavity to reduce the air pressure in the inner cavity of the wheel hub motor, and the wheel hub motor is connected to the chassis.

[0019] The hub motor cover of the utility model is provided with an expansion piece that can expand or contract, and the motor cover body is provided with an expansion cavity; when the air pressure inside the hub motor increases due to the increase of temperature, the expansion piece expands toward the expansion cavity to increase the internal space of the hub motor, thereby reducing the internal air pressure of the hub motor to avoid the air pressure inside the hub motor being too high and impacting the sealing ring inside it, so that the hub motor maintains a better sealing function; when the hub motor stops working, the temperature inside the hub motor drops and the air pressure decreases, so that the expansion piece itself contracts and returns to the initial state, and the air pressure inside the hub motor returns to the initial state, that is, the air pressure inside the hub motor is consistent with the external air pressure, thereby preventing external water, water vapor or dust from entering the interior of the hub motor, avoiding damage such as internal corrosion of the hub motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the embodiment of the utility model, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are some implementations of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 is a schematic diagram of the three-dimensional structure of the hub motor in the first embodiment of the present application;

[0022] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional structure of the hub motor;

[0023] Figure 3 yes Figure 2 An enlarged view of the three-dimensional structure of the hub motor cover of the hub motor;

[0024] Figure 4 yes Figure 3 Schematic diagram of the three-dimensional structure of the hub motor cover;

[0025] Figure 5 yes Figure 4 An enlarged three-dimensional structure diagram of the motor cover body;

[0026] Figure 6 yes Figure 5 A schematic diagram of the three-dimensional structure of the motor cover body from another perspective;

[0027] Figure 7 yes Figure 4 A magnified three-dimensional structure diagram of the expansion member;

[0028] Figure 8 yes Figure 4 An enlarged view of the three-dimensional structure of the positioning member;

[0029] Fig. 9 yes Figure 4 A magnified three-dimensional structure diagram of the protective member;

[0030] Fig.10 yes Figure 1 A schematic diagram of the side structure of the wheel hub motor;

[0031] Fig.11 yes Figure 1 A cross-sectional view of the hub motor along line XI-XI;

[0032] Fig.12 yes Fig.11 An enlarged view of section XII in FIG.

[0033] Fig.13 is a schematic diagram of the three-dimensional structure of the hub motor in the second embodiment of the present application;

[0034] Fig.14 yes Fig.13 A schematic diagram of the three-dimensional structure of one of the wheel hub motor covers;

[0035] Fig.15 yes Fig.14 Schematic diagram of the three-dimensional structure of the hub motor cover;

[0036] Fig.16 yes Fig.15 An enlarged three-dimensional structure diagram of the motor cover body;

[0037] Fig.17 yes Fig.16 A schematic diagram of the three-dimensional structure of the motor cover body from another perspective;

[0038] Fig.18 yes Fig.15 A magnified three-dimensional structure diagram of the expansion member;

[0039] Fig.19 yes Fig.15 A magnified view of the three-dimensional structure of the positioning piece in FIG.

[0040] Fig. 20 yes Fig.19 A schematic diagram of a three-dimensional structure of one of the positioning members from another perspective;

[0041] Fig.21 yes Fig.14 A schematic diagram of the side structure of the hub motor cover;

[0042] Fig. 22 yes Fig.14 A cross-sectional view along line XXII-XXII;

[0043] Fig.23 yes Fig. 22 An enlarged view of section XXIII in FIG.

[0044] Fig.24 It is a schematic diagram of the structure of a vehicle in one embodiment of the present application. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0046] It should be noted that the reference to "embodiment" or "implementation method" in this document means that the specific features, structures or characteristics described in conjunction with the embodiment or implementation method may be included in at least one embodiment of the present utility model. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0047] The terms "first" and "second" appearing in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined. In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and defined, the terms "installed", "connected", "connected", and "set on..." should be understood in a broad sense, for example, it can be a fixed connection, or it can be a detachable connection, or it can be connected in one piece; it can be a mechanical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0048] See also Figures 1 to 4The first embodiment of the utility model provides a hub motor 100, which includes a motor stator 20, a motor rotor 40 and a hub motor cover 60. The motor rotor 40 is rotatably mounted on the motor stator 20, and the hub motor cover 60 is connected to the side of the motor rotor 40. In this embodiment, the hub motor 100 includes two hub motor covers 60, and the two hub motor covers 60 are respectively connected to the opposite sides of the motor rotor 40. The wheel hub motor cover 60 includes a motor cover body 62, an expansion piece 64, a positioning piece 66 and a protective piece 68. The motor cover body 62 is connected to the side of the motor rotor 40. Specifically, the two motor cover bodies 62 are respectively connected to the opposite side parts of the motor rotor 40. The expansion piece 64 is sealedly connected between the motor cover body 62 and the motor rotor 40. The expansion piece 64 can be connected to the motor cover body 62 by screwing or gluing. In this embodiment, the expansion piece 64 is connected to the motor cover body 62 through the positioning piece 66; an expansion cavity 621 is provided on the side of the motor cover body 62 facing the expansion piece 64, and the expansion cavity 621 is used to accommodate the expansion of the expansion piece 64. At the same time, the expansion cavity 621 also serves as a heat dissipation channel for the wheel hub motor 100; when the air pressure in the inner cavity of the wheel hub motor 100 increases, the expansion piece 64 can expand toward the expansion cavity 621, thereby increasing the inner cavity space of the wheel hub motor 100 to reduce the air pressure in the inner cavity of the wheel hub motor 100. Specifically, when the hub motor 100 is working, the air pressure inside the hub motor 100 increases due to the temperature increase, so that the expansion piece 64 expands toward the expansion cavity 621 of the motor cover body 62 through its own elastic deformation, thereby increasing the volume inside the hub motor 100, thereby reducing the pressure inside the hub motor 100; when the hub motor 100 stops working, the internal temperature of the hub motor 100 decreases, the air pressure inside the hub motor 100 decreases, and the expansion piece 64 gradually returns to the initial state under the action of the external pressure and its own elastic force, and the air pressure inside the hub motor 100 returns to the initial state, and the air pressure inside the hub motor is consistent with the external air pressure. Therefore, during the repeated start and stop process of the hub motor 100, the expansion and contraction of the expansion piece 64 balances the air pressure inside the hub motor 100, so that the air pressure inside the hub motor 100 can be kept in a very small range of fluctuations.

[0049] It is understandable that the expansion member 64 is made of a highly elastic material, specifically, the expansion member 64 can be made of, but not limited to, elastic materials such as rubber, plastic or metal, which can achieve expansion of the expansion member 64 itself when subjected to pressure, and can also achieve sealing between the expansion member 64 itself and the expansion cavity 621 of the motor cover body 62. In this embodiment, the expansion member 64 is a circular rubber sheet, one side of which is sealed and connected to the side of the motor cover body 62 facing the motor rotor 40, so that the rubber sheet covers a plurality of expansion cavities 621.

[0050] The hub motor cover 60 in the hub motor 100 of the present application is provided with an expansion piece 64 that can expand or contract, and the motor cover body 62 is provided with an expansion chamber 621. When the air pressure inside the hub motor 100 increases due to the increase in temperature, the expansion piece 64 expands toward the expansion chamber 621 to increase the internal space of the hub motor 100, thereby reducing the internal air pressure of the hub motor 100 to avoid the air pressure inside the hub motor 100 being too high and impacting the sealing ring inside, so that the hub motor 100 maintains a better sealing function; when the hub motor 100 stops working, the temperature inside the hub motor 100 drops and the air pressure decreases, so that the expansion piece 64 shrinks itself and returns to the initial state, and the air pressure inside the hub motor 100 returns to the initial state, that is, the air pressure inside the hub motor 100 is consistent with the external air pressure, thereby preventing external water, water vapor or dust from entering the interior of the hub motor 100, avoiding damage such as internal corrosion of the hub motor 100.

[0051] In other embodiments, the expansion member 64 and the motor cover body 62 may be fixed and sealed by integral injection molding.

[0052] In other embodiments, the expansion member 64 and the motor cover body 62 may also be fixed and sealed by bonding.

[0053] like Figure 2 As shown, the motor rotor 40 includes a rim 42 and a plurality of magnets 44. The plurality of magnets 44 are arranged on the inner circumference of the rim 42 and are evenly spaced around the circumference of the rim 42. A plurality of first connection holes 421 are respectively arranged on opposite sides of the rim 42, and the plurality of first connection holes 421 are evenly spaced along the circumference of the rim 42. Positioning rings 46 are respectively arranged on opposite sides of the outer circumference of the rim 42, and the two positioning rings 46 are used to position the tire.

[0054] The motor stator 20 includes a cylindrical positioning body 22 and a motor shaft 24. The motor shaft 24 is disposed in the middle of the positioning body 22. The axis of the motor shaft 24 is colinear with the axis of the positioning body 22. The opposite ends of the motor shaft 24 extend from the opposite sides of the motor stator 20, that is, the opposite ends of the motor shaft 24 extend from the opposite sides of the positioning body 22. The end of the motor shaft 24 is set as a threaded rod.

[0055] like Figure 2-Figure 6As shown, the motor cover body 62 is provided with a plurality of expansion chambers 621, each expansion chamber 621 passes through two opposite sides of the motor cover body 62, that is, the opposite sides of each expansion chamber 621 pass through two opposite sides of the motor cover body 62 respectively, and the plurality of expansion chambers 621 are arranged along the circumference of the motor rotor 40, and the expansion member 64 is connected to the motor cover body 62, so that the expansion member 64 is sealed and covers the plurality of expansion chambers 621, and the expansion member 64 can expand toward the plurality of expansion chambers 621 respectively. Specifically, the motor cover body 62 is a circular cover plate, and the side of the motor cover body 62 facing the motor rotor 40 is provided with a first installation space 622, and the plurality of expansion chambers 621 are evenly spaced and arranged along the circumference of the motor cover body 62, and the plurality of expansion chambers 621 are all connected to the first installation space 622; the expansion member 64 and the positioning member 66 are both positioned in the first installation space 622. The motor cover body 62 is provided with an axial hole 623 along the axis of the motor rotor 40, the first installation space 622 is a circular space, and the axial hole 623 is coaxial with the first installation space 622. In this embodiment, the expansion cavity 621 is a fan-shaped expansion cavity, the long arc inner circumference of the expansion cavity 621 is close to the outer circumference of the motor cover body 62, and the short arc inner circumference of the expansion cavity 621 is close to the axial hole 623. In other embodiments, the expansion cavity 621 can be, but is not limited to, a rectangular expansion cavity, a trapezoidal expansion cavity, or an elliptical expansion cavity, etc.

[0056] The motor cover body 62 is provided with a plurality of first fixing holes 624 and a plurality of second fixing holes 625 on the inner surface of the first installation space 622. The plurality of first fixing holes 624 form a circle around the circumference of the shaft hole 623, and the circle of first fixing holes 624 is close to the inner circumference of the first installation space 622; the plurality of second fixing holes 625 form a circle around the circumference of the shaft hole 623, and the circle of second fixing holes 625 is close to the shaft hole 623. The motor cover body 62 is provided with a positioning groove 626 around the motor shaft 24 on the side away from the motor rotor 40. Specifically, the circular positioning groove 626 is located on the inner surface of the first installation space 622 of the motor cover body 62 around the shaft hole 623. The positioning groove 626 is coaxial with the shaft hole 623, and the diameter of the positioning groove 626 is larger than the diameter of the shaft hole 623, so as to form a positioning step 6262 between the shaft hole 623 and the positioning groove 626. A connecting flange 627 is provided on one side of the outer peripheral surface of the motor cover body 62 close to the first installation space 622, and a plurality of first positioning holes 6272 are provided on the connecting flange 627. The plurality of first positioning holes 6272 are arranged in a circle along the circumference of the motor cover body 62, and each first positioning hole 6272 passes through the two opposite side surfaces of the connecting flange 627 along an axial direction parallel to the shaft hole 623.

[0057] A second installation space 628 is provided on the side of the motor cover body 62 away from the motor rotor 40, and the plurality of expansion chambers 621 are all connected to the second installation space 628. The first installation space 622 and the second installation space 628 are respectively located on two opposite sides of the motor cover body 62, and the protective member 68 is positioned in the second installation space 628. A sealing groove 6282 is provided around the shaft hole 623 on the side of the motor cover body 62 away from the expansion member 64. Specifically, the circular sealing groove 6282 is located on the inner surface of the second installation space 628 of the motor cover body 62, the sealing groove 6282 is coaxial with the shaft hole 623, and the diameter of the sealing groove 6282 is greater than the diameter of the shaft hole 623, so as to form a sealing step 6284 between the shaft hole 623 and the sealing groove 6282.

[0058] Optionally, the motor cover body 62 adopts a hollow design, that is, a support bar 629 is provided between two adjacent expansion cavities 621 of the motor cover body 62, and the support bar 629 is provided with a first heat dissipation slot 6292 connected to the second installation space 628; the length direction of the first heat dissipation slot 6292 on each support bar 629 is parallel to the length direction of the support bar 629. In this embodiment, the surface of the support bar 629 facing the second installation space 628 is provided with a first heat dissipation slot 6292. In other embodiments, the surface of the support bar 629 facing the expansion cavity 621 is provided with a first heat dissipation slot, or the surface of the support bar 629 facing the second installation space 628 and the surface facing the expansion cavity 621 are respectively provided with a first heat dissipation slot. Providing the first heat dissipation slot 6292 on the support bar 629 can not only reduce the weight of the motor cover body 62, but also increase the heat dissipation area of ​​the motor cover body 62 and increase the heat dissipation function.

[0059] like Figure 4 and Figure 7 As shown, a first through hole 642 is provided in the middle portion of the expansion member 64 along its axial direction, and a plurality of first through holes 644 and a plurality of second through holes 646 are provided on the side of the expansion member 64. The plurality of first through holes 644 form a circle around the circumference of the first through hole 642, and a circle of first through holes 644 is close to the outer peripheral surface of the expansion member 64; the plurality of second through holes 646 form a circle around the circumference of the first through hole 642, and a circle of second through holes 646 is close to the first through hole 642.

[0060] like Figure 4 and Figure 8As shown, the positioning member 66 is a circular positioning piece, and a plurality of first air cavities 662 are provided on the positioning member 66, and the plurality of first air cavities 662 are arranged along the circumference of the positioning member 66; further, the plurality of first air cavities 662 are evenly spaced and arranged along the circumference of the positioning member 66. The first air cavities 662 can facilitate the internal gas of the hub motor 100 to pass through and act on the expansion member 64. The middle part of the positioning member 66 is provided with a second through hole 663 along its axial direction. In this embodiment, the first air cavities 662 are fan-shaped vents, and the long arc section of the first air cavities 662 is close to the outer peripheral surface of the positioning member 66, and the short arc section of the first air cavities 662 is close to the second through hole 663 of the positioning member 66; the positioning member 66 is provided with 8 first air cavities 662, and the 8 first air cavities 662 are evenly arranged around the circumference of the second through hole 663. The side of the positioning member 66 facing away from the expansion member 64 is provided with a plurality of first countersunk holes 664 and a plurality of second countersunk holes 665. The plurality of first countersunk holes 664 form a circle around the circumference of the second through hole 663, and a circle of first countersunk holes 664 is close to the outer peripheral surface of the positioning member 66; the plurality of second countersunk holes 665 form a circle around the circumference of the second through hole 663, and a circle of second countersunk holes 665 is close to the second through hole 663. Optionally, the opening area of ​​the first air cavity 662 on the positioning member 66 is as large as possible to facilitate better heat dissipation of the hub motor 100. In other embodiments, the first air cavity can be, but is not limited to, a rectangular cavity, a trapezoidal cavity, an elliptical cavity, etc.

[0061] like Figure 4 and Fig. 9 As shown, the protective member 68 is a circular protective sheet, and a third through hole 683 is provided in the middle of the protective member 68 along its axial direction; a plurality of first heat dissipation holes 685 are provided on the protective member 68, and the first heat dissipation holes 685 are connected to the expansion cavity 621. The plurality of first heat dissipation holes 685 on the protective member 68 can not only dissipate heat for the motor cover body 62, but also reduce the weight of the motor cover body 62 itself. In other embodiments, the protective member 68 can be made of, but not limited to, a metal woven mesh.

[0062] like Figure 4 As shown, the wheel hub motor cover 60 also includes a wheel hub oil seal 63, a motor bearing 65, a first locking piece 67 and a second locking piece 69; the wheel hub oil seal 63 is arranged in the middle of one side of the motor cover body 62, and the motor bearing 65 is arranged in the middle of the other side of the motor cover body 62; the first locking piece 67 is used to connect the motor cover body 62 to the motor rotor 40, and the second locking piece 69 is used to connect the expansion piece 64 and the positioning piece 66 to the motor cover body 62.

[0063] like Figure 3-Figure 6As shown, when assembling the hub motor cover 60, the protective member 68 is accommodated in the second installation space 628 of the motor cover body 62, and the protective member 68 is fixedly connected to the motor cover body 62 by welding, so that the third through hole 683 faces the shaft hole 623; in other embodiments, the protective member 68 can also be fixedly connected to the motor cover body 62 by screwing, bonding, etc. The expansion member 64 is placed in the first installation space 622 of the motor cover body 62, so that the multiple first through holes 644 of the expansion member 64 are respectively facing the multiple first fixing holes 624, the multiple second through holes 646 are respectively facing the multiple second fixing holes 625, and the first through hole 642 is facing the shaft hole 623; the positioning member 66 is attached to the side of the expansion member 64 away from the protective member 68, and the positioning member 66 is positioned in the first installation space 622, so that the multiple first air cavities 662 are respectively facing the multiple expansion cavities 621 of the motor cover body 62, the multiple first countersunk holes 664 are respectively facing the multiple first through holes 644, the multiple second countersunk holes 665 are respectively opposite to the multiple second through holes 646, and the second through hole 663 is opposite to the axial hole 623, and a part of the second fastening members 69 are respectively passed through the multiple first countersunk holes 664 and the multiple first through holes 644 and are respectively locked in the multiple first fixing holes 624; another part of the second fastening members 69 are respectively passed through the multiple second countersunk holes 665 and the multiple second through holes 646 and are respectively locked in the multiple second fixing holes 625, so that the positioning member 66 is fixedly connected to the motor cover body 62, and the expansion member 64 is clamped between the motor cover body 62 and the positioning member 66 to achieve sealing between the motor cover body 62 and the expansion member 64. The wheel hub oil seal 63 is positioned in the sealing groove 6282 through the third through hole 683, and the side of the wheel hub oil seal 63 is against the sealing step 6284; the motor bearing 65 is positioned in the positioning groove 626 through the second through hole 663 of the positioning member 66 and the first through hole 642 of the expansion member 64, and the side of the motor bearing 65 is against the positioning step 6262; the axis of the wheel hub oil seal 63, the axis of the shaft hole 623 and the axis of the motor bearing 65 are collinear.

[0064] like Figure 1-Figure 2 and Figure 10-12As shown, when assembling the wheel hub motor 100, the motor rotor 40 is sleeved on the motor stator 20, so that the plurality of magnets 44 are arranged around the outer circumferential surface of the positioning body 22; the two wheel hub motor covers 60 are respectively connected to the opposite sides of the motor rotor 40, so that the opposite ends of the motor shaft 24 are respectively penetrated through the shaft holes 623 of the two motor cover bodies 62; specifically, one of the wheel hub motor covers 60 is connected to one side of the motor rotor 40, so that one end of the motor shaft 24 is inserted into the inner cavity of the motor bearing 65 of the wheel hub motor cover 60, the shaft hole 623 and the inner cavity of the hub oil seal 63, and the hub oil seal 63 is sealingly sleeved on the motor shaft 24 and positioned at the motor cover body 62 away from the motor. On one side of the motor rotor 40, the motor shaft 24 is fixedly connected to the motor bearing 65, and a plurality of first locking members 67 are respectively passed through a plurality of first positioning holes 6272 and locked to a plurality of first connecting holes 421 of the motor rotor 40; another wheel hub motor cover 60 is connected to the other side of the motor rotor 40, so that the other end of the motor shaft 24 is inserted into the inner cavity of the motor bearing 65, the shaft hole 623 and the inner cavity of the wheel hub oil seal 63 of the wheel hub motor cover 60, so that the motor shaft 24 is tightly matched with the motor bearing 65 and the wheel hub oil seal 63, and a plurality of first locking members 67 are respectively passed through a plurality of first positioning holes 6272 and locked to a plurality of first connecting holes 421 of the motor rotor 40. Since the wheel hub oil seal 63 is closely matched with the motor cover body 62 and the motor shaft 24 of the motor stator 20 to achieve the sealing of the inner cavity of the wheel hub motor 100, it can block the passage of air, water, water vapor or dust inside and outside the wheel hub motor 100, and prevent the internal gas of the wheel hub motor 100 from leaking from the expansion cavity 621 of the wheel hub motor cover 60. The motor shaft 24 on the opposite sides of the motor stator 20 respectively supports the two wheel hub motor covers 60 and the motor rotor 40, so that the motor stator 20, the motor rotor 40 and the wheel hub motor cover 60 can maintain relative positions, and the motor rotor 40 and the two wheel hub motor covers 60 can rotate freely around the motor shaft 24 relative to the motor stator 20. The protective member 68 can limit the expansion member 64 to prevent the expansion member 64 from protruding from the outer side wall of the motor cover body 62, and can also prevent external guides from invading the motor cover body 62 and causing damage to the expansion member 64.

[0065] Please also read Figure 13-Figure 15The structure of the hub motor 100a in the second embodiment of the present application is similar to that of the hub motor 100 in the first embodiment, except that the specific structure of the hub motor cover 60a in the second embodiment is different from the specific structure of the hub motor cover 60 in the first embodiment, specifically: the specific structure of the motor cover body 62a in the second embodiment is slightly different from the specific structure of the motor cover body 62 in the first embodiment, the specific structure of the expansion member 64a in the second embodiment is slightly different from the specific structure of the expansion member 64 in the first embodiment, and the specific structure of the positioning member 66a in the second embodiment is slightly different from the specific structure of the positioning member 66a in the first embodiment.

[0066] like Figure 15-17 As shown, an expansion cavity 621a is provided on the side of the motor cover body 62a facing the expansion piece 64a, and the expansion cavity 621a does not penetrate the side of the motor cover body 62a away from the expansion piece 64a, so that a protective plate 620 is provided on the side of the motor cover body 62a away from the expansion piece 64a, and the protective plate 620 covers the side of the expansion cavity 621a away from the expansion piece 64a; the expansion cavity 621a is used to accommodate the expansion of the expansion piece 64a to increase the volume inside the hub motor 100a, thereby reducing the pressure inside the hub motor 100a; the protective plate 620 can limit the expansion piece 64a to prevent the expansion piece 64a from protruding from the outer wall of the motor cover body 62a, and can also prevent external guides from invading the motor cover body 62a and causing damage to the expansion piece 64a. Optionally, the protective plate 620 is provided with a second heat dissipation hole 6201 connected to the expansion chamber 621a; in this embodiment, the protective plate 620 is provided with a plurality of second heat dissipation holes 6201, which can not only dissipate heat for the motor cover body 62a, but also reduce the weight of the motor cover body 62a. In other embodiments, the protective plate 620 can be made of, but not limited to, a metal woven mesh.

[0067] In this embodiment, the motor cover body 62a is provided with a plurality of expansion chambers 621a on the side facing the expansion member 64a, each expansion chamber 621a is connected to the first installation space 622a, and the plurality of expansion chambers 621a are evenly spaced around the axis of the shaft hole 623; specifically, the motor cover body 62a is provided with four expansion chambers 621a on the inner surface of the first installation space 622a, and the four expansion chambers 621a are evenly spaced around the axis of the shaft hole 623, and the angle between each two adjacent expansion chambers 621a is 90 degrees. The motor cover body 62a is provided with a circular positioning groove 626 on the inner surface of the first installation space 622a, the shaft hole 623 and the positioning groove 626 are coaxial, and the diameter of the positioning groove 626 is greater than the diameter of the shaft hole 623, so as to form a positioning step 6262 between the shaft hole 623 and the positioning groove 626. The motor cover body 62a is provided with a circle of first fixing holes 624 and a circle of second fixing holes 625 on the inner surface of the first installation space 622a. The circle of first fixing holes 624 is close to the inner circumference of the first installation space 622a, and the circle of second fixing holes 625 is arranged around the shaft hole 623.

[0068] Optionally, the surface of the motor cover body 62a away from the expansion chamber 621a is provided with second heat dissipation grooves 6203 on opposite sides of each protective plate 620, and the surface of the motor cover body 62a away from the expansion chamber 621a is provided with third heat dissipation grooves 6204 on one end of each protective plate 620 away from the shaft hole 623; the expansion chamber 621a is a fan-shaped cavity, the two second heat dissipation grooves 6203 are respectively close to the opposite sides of the expansion chamber 621a, and the third heat dissipation groove 6204 is parallel to the arc surface of the expansion chamber 621a. Providing the second heat dissipation groove 6203 and the third heat dissipation groove 6204 on the motor cover body 62a can not only reduce the weight of the motor cover body 62a, but also increase the heat dissipation area of ​​the motor cover body 62a and increase the heat dissipation function.

[0069] Optionally, a heat dissipation cavity 6205 is provided on the side of the motor cover body 62a facing away from the expansion piece 64a, and the heat dissipation cavity 6205 can not only reduce the weight of the motor cover body 62a, but also increase the heat dissipation area and heat dissipation effect of the motor cover body 62a; specifically, a plurality of heat dissipation cavities 6205 are provided on the surface of the motor cover body 62a facing away from the expansion piece 64a, and the plurality of heat dissipation cavities 6205 are arranged along the circumference of the motor cover body 62a, and the plurality of heat dissipation cavities 6205 are respectively staggered with the plurality of expansion cavities 621a, and one side of the heat dissipation cavity 6205 extends to the side of the motor cover body 62a facing the expansion piece 64a, one end of the heat dissipation cavity 6205 is close to the shaft hole 623, and the other end of the heat dissipation cavity 6205 is close to the outer peripheral surface of the motor cover body 62a; each heat dissipation cavity 6205 is located between two protective plates 620. In this embodiment, a plurality of heat dissipation cavities 6205 are evenly arranged along the circumference of the motor rotor, that is, a plurality of heat dissipation cavities 6205 are evenly spaced and arranged in a circle along the circumference of the motor cover body 62a, and a plurality of expansion cavities 621a are evenly arranged along the circumference of the motor rotor, that is, a plurality of expansion cavities 621a are evenly spaced and arranged in a circle along the circumference of the motor cover body 62a, and each heat dissipation cavity 6205 is located between two adjacent expansion cavities 621a; in this embodiment, the heat dissipation cavity 6205 is a fan-shaped heat dissipation cavity. In other embodiments, the heat dissipation cavity 6205 can be, but is not limited to, a rectangular heat dissipation cavity, a trapezoidal heat dissipation cavity, or an elliptical heat dissipation cavity, etc. Further, a plurality of heat dissipation fins 6206 are arranged in the heat dissipation cavity 6205, and the plurality of heat dissipation fins 6206 are spaced from each other, and the opposite ends of the heat dissipation fins 6206 are respectively connected to the opposite sides of the heat dissipation cavity 6205. In this embodiment, the heat sink 6206 is an arc-shaped piece, the axis of the heat sink 6206 is colinear with the axis of the shaft hole 623, and the opposite ends of the heat sink 6206 are respectively connected to the opposite sides of the heat sink cavity 6205. In other embodiments, the heat sink 6206 can be a rectangular heat sink, a wavy heat sink, etc. In other embodiments, the opposite ends of the heat sink 6206 are respectively connected to the two opposite inner arc surfaces of the heat sink cavity 6205.

[0070] like Figure 15-18As shown, the expansion member 64a includes a plurality of expansion pieces 645, and the plurality of expansion pieces 645 are respectively sealed and covered in the plurality of expansion cavities 621a; in this embodiment, the expansion member 64a includes four expansion pieces 645, and the four expansion pieces 645 are respectively sealed and covered in the four expansion cavities 621a; the expansion piece 645 can be made of elastic materials such as but not limited to rubber, plastic or metal, so that the expansion piece 645 itself can be expanded when subjected to pressure, and at the same time, the expansion piece 645 itself can be sealed with the expansion cavity 621a of the motor cover body 62a. Specifically, the expansion piece 645 is a sector-shaped rubber piece, and the expansion piece 645 is provided with a third through hole 6452 at two opposite ends of one side of the expansion piece 645 close to the outer circumference of the long arc, and the expansion piece 645 is provided with a fourth through hole 6454 at two opposite ends of one side of the expansion piece 645 close to the outer circumference of the short arc. In other embodiments, the expansion piece 645 can be a rectangular expansion piece, a trapezoidal expansion piece or an elliptical expansion piece, etc.

[0071] like Fig.15 and Figure 19-20 As shown, the positioning member 66a includes a plurality of positioning pieces 666, and the plurality of positioning pieces 666 are respectively attached to the side of the plurality of expansion pieces 645 away from the motor cover body 62a, and each positioning piece 666 is connected to the motor cover body 62a, so that the expansion piece 645 is clamped between the motor cover body 62a and the corresponding positioning piece 666; a second air cavity 6662 is opened on the positioning piece 666, and the second air cavity 6662 is opposite to the expansion cavity 621a; optionally, in order to facilitate the internal gas of the hub motor 100a to better pass through the second air cavity 6662 to act on the expansion piece 645, the opening of the second air cavity 6662 should be as large as possible to facilitate better heat dissipation of the hub motor 100a. In this embodiment, the positioning piece 666 is a fan-shaped piece, and the shape of the expansion cavity 621a is similar to that of the positioning piece 666. The long arc end of the expansion cavity 621a is close to the long arc end of the positioning piece 666, and the short arc end of the expansion cavity 621a is close to the short arc end of the positioning piece 666. The positioning piece 666 has third countersunk holes 6664 at two opposite ends on one side close to the long arc outer circumference, and fourth countersunk holes 6665 at two opposite ends on one side close to the short arc outer circumference. In other embodiments, the positioning piece 666 may also be a rectangular piece, a trapezoidal piece, an elliptical piece, etc., and the second air passage cavity 6662 may also be a rectangular air passage cavity, a trapezoidal air passage cavity, an elliptical air passage cavity, etc.

[0072] Please also read Figure 14-Figure 23When assembling the hub motor cover 60a, multiple expansion sheets 645 are accommodated in the first installation space 622 of the motor cover body 62a and respectively cover the multiple expansion cavities 621a, so that the two third through holes 6452 of each expansion sheet 645 are respectively opposite to the two first fixing holes 624, and the two fourth through holes 6454 are respectively opposite to the two second fixing holes 625; multiple positioning sheets 666 are accommodated in the first installation space 622 of the motor cover body 62a and respectively adhered to the surfaces of the multiple expansion sheets 645 away from the motor cover body 62a, so that the second air cavity 6662 of each positioning sheet 666 is opposite to the corresponding expansion cavity 621a, and the two third countersunk holes 6664 are opposite to the corresponding expansion cavity 621a. They are respectively opposite to the two third through holes 6452, and the two fourth countersunk holes 6665 are respectively opposite to the two fourth through holes 6454; a part of the second fasteners 69 are respectively passed through the multiple third countersunk holes 6664 and the multiple third through holes 6452 and are respectively locked in the multiple first fixing holes 624; another part of the second fasteners 69 are respectively passed through the multiple fourth countersunk holes 6665 and the fourth through holes 6454 and are respectively locked in the multiple second fixing holes 625, so that the positioning piece 666 is fixedly connected to the motor cover body 62a, and the expansion piece 645 is clamped between the motor cover body 62a and the positioning piece 666 to achieve sealing between the motor cover body 62a and the expansion piece 645. The wheel hub oil seal 63 is tightly positioned in the sealing groove 6282, and the side of the wheel hub oil seal 63 abuts against the sealing step 6284; the motor bearing 65 is positioned in the positioning groove 626, and the side of the motor bearing 65 abuts against the positioning step 6262; the axis of the wheel hub oil seal 63, the axis of the shaft hole 623 and the axis of the motor bearing 65 are collinear.

[0073] The assembly steps of the wheel hub motor in the second embodiment are the same as those in the first embodiment, and are not described here. The inner cavity of the wheel hub oil seal 63 is sealedly sleeved on the motor shaft 24 of the motor stator 20, and the wheel hub oil seal 63 is tightly matched with the motor cover body 62 to achieve the sealing of the inner cavity of the wheel hub motor. The wheel hub oil seal 63 can block the passage of air, water and water vapor inside and outside the wheel hub motor. The motor bearing 65 is fixedly sleeved on the motor shaft 24 to achieve support and free rotation of the motor cover body 62.

[0074] The number of expansion cavities 621a on the motor cover body 62a in this embodiment is reduced compared to the number of expansion cavities 621 on the motor cover body 62 in the first embodiment. At the same time, a heat dissipation cavity 6205 is added to the motor cover body 62a, which has a significant effect on the internal and external air pressure of the hub motor 100a with high heat generation. In addition, the protective parts are omitted in the hub motor cover 60a, so that the number of parts of the hub motor cover 60a is reduced, the production cost is reduced, and the manufacturing efficiency is higher.

[0075] like Fig.24As shown, the present application also provides a vehicle 200, which includes a chassis 202 and a hub motor. The hub motor is connected to the chassis 202, specifically, the threaded rod of the motor shaft 24 is connected to the chassis 202; the hub motor is outer-mounted with a tire 204; the hub motor can be the hub motor 100 in the first embodiment or the hub motor 100a in the second embodiment.

[0076] The embodiments of the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the embodiments above is only used to help understand the method of the present invention and its core idea.

Claims

1. A hub motor, characterized in that: The wheel hub motor comprises: Motor stator; a motor rotor, the motor rotor being rotatably sleeved on the motor stator; and A wheel hub motor cover, the wheel hub motor cover comprises a motor cover body and an expansion piece, the motor cover body is connected to the side of the motor rotor, the expansion piece is sealingly connected between the motor cover body and the motor rotor, and an expansion cavity is provided on the side of the motor cover body facing the expansion piece; the increase in air pressure in the inner cavity of the wheel hub motor can cause the expansion piece to expand toward the expansion cavity to reduce the air pressure in the inner cavity of the wheel hub motor.

2. The wheel hub motor according to claim 1, characterized in that: The motor cover body is provided with a plurality of expansion cavities, which are arranged along the circumference of the motor rotor. The expansion member is sealed and covers the plurality of expansion cavities, and the expansion member can expand toward the plurality of expansion cavities respectively.

3. The wheel hub motor according to claim 2, characterized in that: The hub motor cover also includes a positioning member, which is attached to a side of the expansion member facing the motor rotor, and the positioning member is fixedly connected to the motor cover body, and the expansion member is clamped between the motor cover body and the positioning member.

4. The wheel hub motor according to claim 3, characterized in that: A plurality of first air cavities are provided on the positioning member, the plurality of first air cavities are arranged along the circumference of the motor rotor, and the plurality of first air cavities are respectively opposite to the plurality of expansion cavities.

5. The wheel hub motor according to claim 3, characterized in that: A first installation space is provided on the side of the motor cover body facing the motor rotor, the plurality of expansion chambers are all connected to the first installation space, and the expansion member and the positioning member are both positioned in the first installation space.

6. The wheel hub motor according to claim 2, characterized in that: The expansion cavity passes through two opposite side surfaces of the motor cover body. The hub motor cover also includes a protective member connected to a side of the motor cover body away from the motor rotor. A first heat dissipation hole is provided on the protective member, and the first heat dissipation hole is connected to the expansion cavity.

7. The wheel hub motor according to claim 6, characterized in that: A second installation space is provided on the side of the motor cover body away from the motor rotor, and the protective member is positioned in the second installation space; a support bar is provided between two adjacent expansion chambers of the motor cover body, and the support bar is provided with a first heat dissipation groove connected to the second installation space.

8. The wheel hub motor according to claim 3, characterized in that: A protective plate is provided on a side of the motor cover body facing away from the expansion member, the protective plate covers the expansion cavity, and the protective plate is provided with a second heat dissipation hole communicating with the expansion cavity.

9. The wheel hub motor according to claim 8, characterized in that: A plurality of heat dissipation cavities are provided on the side of the motor cover body facing away from the expansion piece. The plurality of heat dissipation cavities are arranged along the circumference of the motor rotor. The plurality of heat dissipation cavities are respectively offset from the plurality of expansion cavities. One side of the heat dissipation cavity extends to the side of the motor cover body facing the expansion piece.

10. The wheel hub motor according to claim 9, characterized in that: A plurality of heat dissipation cavities are evenly arranged along the circumference of the motor rotor, a plurality of expansion cavities are evenly arranged along the circumference of the motor rotor, and each heat dissipation cavity is located between two adjacent expansion cavities; a plurality of heat dissipation fins are arranged in the heat dissipation cavity, and the plurality of heat dissipation fins are spaced apart from each other.

11. The wheel hub motor according to claim 8, characterized in that: The expansion member includes a plurality of expansion sheets, which are respectively sealed and covered on the plurality of expansion cavities; the positioning member includes a plurality of positioning sheets, which are respectively attached to the side of the plurality of expansion sheets away from the motor cover body, and each positioning sheet is connected to the motor cover body; a second air passage cavity is provided on the positioning sheet, and the second air passage cavity is directly opposite to the expansion cavity.

12. The wheel hub motor according to claim 1, characterized in that: The wheel hub motor cover is connected to opposite sides of the motor rotor, and the motor cover body is provided with an axial hole along the axis of the motor rotor; the motor stator comprises a motor shaft, and opposite ends of the motor shaft extend out of opposite sides of the motor stator, respectively, and opposite ends of the motor shaft are respectively passed through the axial holes of the two motor cover bodies; the wheel hub motor cover also comprises a wheel hub oil seal, which is sealingly sleeved on the motor shaft and sealingly positioned on the motor cover body.

13. A vehicle, characterized in that: The vehicle comprises a chassis and a wheel hub motor as described in any one of claims 1 to 12, wherein the wheel hub motor is connected to the chassis.

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