Wheel and electric automobile

Abstract

The utility model relates to the technical field of automobiles, and provides a wheel and an electric automobile, the wheel comprises a hub, a hub motor, a speed reducing mechanism and a brake mechanism, the hub comprises a rim and a spoke, the rim and the spoke define a placing cavity, and the hub motor, the speed reducing mechanism and the brake mechanism are all located in the placing cavity and located on the same side of the spoke; the hub motor comprises a motor rotor, and the motor rotor is connected with the spoke through a speed reducing mechanism. According to the wheel, due to the fact that the hub motor, the speed reducing mechanism and the brake mechanism are all located on the same side of the spoke, the hub motor and the speed reducing mechanism do not need to be disassembled firstly when the hub is disassembled, and the hub is easy to disassemble; moreover, compared with the prior art, a mandrel penetrating through the hub motor, the speed reducing mechanism and the spoke in the axial direction of the wheel can be omitted, and the structure of the wheel is simplified.

Description

Technical Field

[0001] The present application relates to the technical field of automobiles, and particularly relates to a wheel and an electric vehicle. Background Art

[0002] The wheels of electric vehicles generally include a wheel hub and a hub motor, a speed reduction mechanism, and a braking mechanism installed inside the wheel hub. When the electric vehicle starts, the hub motor drives the wheel hub to rotate through the speed reduction mechanism to realize the rotation of the wheel, and then realize the driving of the electric vehicle; when the electric vehicle needs to stop, the braking mechanism is used to brake the wheel hub to realize the braking of the wheel, and then realize braking.

[0003] Generally, the wheel hub includes a rim and spokes; in the prior art, the hub motor and the speed reduction mechanism are located on the axial outer side of the spokes, and the braking mechanism is located on the axial inner side of the spokes. In this way, it is necessary to first remove the hub motor and the speed reduction mechanism before the wheel hub can be disassembled, resulting in a relatively troublesome disassembly of the wheel hub. Summary of the Utility Model

[0004] In view of this, the embodiments of the present application provide a wheel and an electric vehicle to solve the problem of relatively troublesome disassembly of the wheel hub.

[0005] A first aspect of the present application proposes a wheel, including a wheel hub, a hub motor, a speed reduction mechanism, and a braking mechanism. The wheel hub includes a rim and spokes. The rim and the spokes enclose a placement cavity. The hub motor, the speed reduction mechanism, and the braking mechanism are all located in the placement cavity and on the same side of the spokes. The hub motor includes a motor rotor, and the motor rotor is connected to the spokes through the speed reduction mechanism.

[0006] The beneficial effects of the wheel provided by the embodiments of the present application: Since the hub motor, the speed reduction mechanism, and the braking mechanism are all on the same side of the spokes, it is not necessary to first remove the hub motor and the speed reduction mechanism when disassembling the wheel hub, making the disassembly of the wheel hub relatively simple; moreover, compared with the prior art, a mandrel that axially passes through the hub motor, the speed reduction mechanism, and the spokes can be omitted, simplifying the structure of the wheel.

[0007] In some embodiments, the hub motor further includes a motor housing and a motor stator. The motor housing has an annular installation cavity and an installation groove with an opening facing the spokes. A part of the motor stator and the motor rotor is located in the annular installation cavity, and another part of the motor rotor extends out of the annular installation cavity and is connected to the speed reduction mechanism. The speed reduction mechanism is located in the installation groove.

[0008] In some embodiments, the braking mechanism includes a brake caliper and a brake disc. The brake disc is an annular disc, the brake disc is fixed on the rim, and the jaws of the brake caliper face away from the center line of the rim.

[0009] In some embodiments, the brake caliper is fixed on the outer wall surface of the motor housing facing away from the spoke.

[0010] In some embodiments, the motor rotor is in a bowl-shaped structure. An intermediate convex portion and an edge concave portion are formed on a side surface of the motor housing facing away from the spoke. The intermediate convex portion and the mounting groove are arranged corresponding to each other in the axial direction of the in-wheel motor. The edge concave portion is used to avoid the brake caliper.

[0011] In some embodiments, the speed reduction mechanism includes a fixed cylinder, a planet carrier, a plurality of planet gears, and a sun gear shaft. The fixed cylinder is fixed in the mounting groove. The fixed cylinder includes a cylinder body and an internal gear ring provided on the inner wall surface of the cylinder body. The planet carrier is located inside the cylinder body and is fixedly connected to the spoke. The plurality of planet gears are respectively rotatably mounted on the planet carrier and mesh with the internal gear ring. The sun gear shaft is fixed on the motor rotor and meshes with the plurality of planet gears.

[0012] In some embodiments, the planet carrier is in a cylindrical structure. The plurality of planet gears are respectively rotatably mounted at one end of the planet carrier away from the spoke, and one end of the planet carrier close to the spoke is a closed structure.

[0013] In some embodiments, the planet carrier has a plurality of first threaded holes arranged at intervals in its circumferential direction. The spoke has a plurality of first through holes arranged at intervals in its circumferential direction. The wheel further includes a plurality of first fastening screws. The plurality of first fastening screws respectively pass through the plurality of first through holes and are respectively screwed into the plurality of first threaded holes to realize the fixed connection between the spoke and the planet carrier.

[0014] In some embodiments, the sun gear shaft has a second threaded hole extending along its axial direction. The motor rotor has a second through hole penetrating along its axial direction. The wheel further includes a second fastening screw. The second fastening screw passes through the second through hole and is screwed into the second threaded hole to realize the fixed connection between the sun gear shaft and the motor rotor. A rotation prevention structure is further provided between the sun gear shaft and the motor rotor.

[0015] In a second aspect of the present application, an electric vehicle is proposed. The electric vehicle includes a wheel as described in the first aspect.

[0016] The electric vehicle adopts any one or more embodiments of the above-mentioned wheel, and thus has the beneficial effects of the above-mentioned embodiments, which will not be elaborated here one by one.

[0017] The above description is only an overview of the technical solution of the present application. In order to better understand the technical means of the present application, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically described below. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of conventional technologies. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 is an exploded view of the wheel from the first perspective provided by some embodiments of the present application;

[0020] Figure 2 is an exploded view of the wheel from the second perspective provided by some embodiments of the present application;

[0021] Figure 3 is Figure 1 a schematic structural diagram of the speed reduction mechanism in

[0022] Figure 4 is Figure 1 a schematic structural diagram of the braking mechanism in

[0023] Figure 5 is a cross-sectional view of the wheel provided by some embodiments of the present application;

[0024] Figure 6 is Figure 5 an enlarged view of the wheel shown at A.

[0025] The meanings of the marks in the drawings are as follows:

[0026] 100, wheel;

[0027] 10, hub; 11, rim; 111, fixed convex part; 12, spoke; 121, first through hole; 13, placement cavity;

[0028] 20, in-wheel motor;

[0029] 21, motor housing; 211, annular installation cavity; 212, installation groove; 213, fixed column; 214, fixing hole; 215, edge recess; 216, middle convex part; 22, motor stator; 23, motor rotor; 231, second through hole;

[0030] 30. Reduction mechanism; 31. Fixed cylinder; 311. Cylinder body; 312. Internal gear ring; 32. Planet carrier; 321. First threaded hole; 322. Mounting post; 323. Connecting convex part; 33. Planet gear; 34. Sun gear shaft; 341. Second threaded hole; 342. Key;

[0031] 40. Brake mechanism; 41. Brake disc; 411. Ring plate; 412. Connecting plate; 42. Brake caliper; 421. Caliper jaws; 422. Connecting part. Detailed implementation manner

[0032] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, so they are only examples and cannot be used to limit the protection scope of the present application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0034] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0035] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0036] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0037] In the description of the embodiments of the present application, the term "plural" means two or more (including two). Similarly, "multiple groups" means two or more groups (including two groups), and "multiple pieces" means two or more pieces (including two pieces).

[0038] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present application.

[0039] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0040] An embodiment of the first aspect of the present application provides a wheel, which is applied to an electric vehicle. Please refer to Figure 1 、 Figure 2 and Figure 5 simultaneously. The wheel 100 includes a hub 10, a hub motor 20, a reduction mechanism 30, and a braking mechanism 40. The hub 10 includes a rim 11 and a spoke 12. The rim 11 and the spoke 12 enclose a placement cavity 13. The hub motor 20, the reduction mechanism 30, and the braking mechanism 40 are all located in the placement cavity 13 and on the same side of the spoke 12. The hub motor 20 includes a motor rotor 23, and the motor rotor 23 is connected to the spoke 12 through the reduction mechanism 30.

[0041] The rim 11 is of a cylindrical structure. The spoke 12 can be provided at one axial end of the rim 11, or the spoke 12 can also be provided inside the rim 11 and close to one axial end of the rim 11, so that the rim 11 and the spoke 12 enclose the placement cavity 13. In this way, when the axial width of the rim 11 is certain, it can be ensured that the placement cavity 13 has a sufficiently large axial space to place the hub motor 20, the reduction mechanism 30, and the braking mechanism 40.

[0042] Among them, the rim 11 is used for installing a tire, and the spoke 12 plays a role of connection and support. It can be understood that the spoke 12 can be a spoke-type spoke or a spoke-type spoke.

[0043] The hub motor 20, the speed reduction mechanism 30 and the brake mechanism 40 are all in the placement cavity 13, and are all located on the same side of the spoke 12. It can be understood that after the wheel 100 is installed on the vehicle body, the hub motor 20, the speed reduction mechanism 30 and the brake mechanism 40 are all located on the inner side of the spoke 12, which is convenient for disassembly, assembly and replacement of the hub 10. The inner side of the spoke 12 refers to the side of the spoke 12 facing the middle of the vehicle body.

[0044] The motor rotor 23 is connected to the spoke 12 via the reduction mechanism 30 . It can be understood that the motor rotor 23 is connected to the input end of the reduction mechanism 30 , and the output end of the reduction mechanism 30 is connected to the spoke 12 , that is, the rotation of the motor rotor 23 drives the wheel hub 10 to rotate.

[0045] It can be understood that the wheel hub motor 20 can be located between the wheel spokes 12 and the brake mechanism 40 ; or, the brake mechanism 40 can be located between the wheel spokes 12 and the wheel hub motor 20 .

[0046] The wheel 100 provided in the embodiment of the present application has the following beneficial effects: since the hub motor 20, the reduction mechanism 30 and the brake mechanism 40 are all on the same side of the spoke 12, there is no need to remove the hub motor 20 and the reduction mechanism 30 first when disassembling the hub 10, making the disassembly of the hub 10 relatively simple.

[0047] Please also refer to Figure 1 , Figure 2 and Figure 5 In some embodiments, the hub motor 20 further includes a motor housing 21 and a motor stator 22. The motor housing 21 has an annular mounting cavity 211 and a mounting groove 212 opening toward the spoke 12. The motor stator 22 and a portion of the motor rotor 23 are located in the annular mounting cavity 211. Another portion of the motor rotor 23 extends out of the annular mounting cavity 211 and is connected to the reduction mechanism 30. The reduction mechanism 30 is located in the mounting groove 212.

[0048] Optionally, the motor housing 21 is formed by a first sub-shell and a second sub-shell fixedly connected, for example, the first sub-shell and the second sub-shell can be fixedly connected by welding, fastener connection, clamping, interference connection, crimping, etc. The annular mounting cavity 211 is surrounded by the first sub-shell and the second sub-shell; the first sub-shell is located between the spoke 12 and the second sub-shell, and the first sub-shell is recessed to form a mounting groove 212.

[0049] Optionally, the mounting groove 212 is in the shape of a circular groove.

[0050] The motor stator 22 is fixed on the inner wall surface of the annular mounting cavity 211. For example, the motor stator 22 can be fixed on the inner wall surface of the annular mounting cavity 211 by welding, fastener connection, clamping, interference connection, crimping, glue injection connection, etc.

[0051] The portion of the motor rotor 23 in the annular mounting cavity 211 does not contact the inner wall surface of the motor housing 21 ; the portion of the motor rotor 23 extending out of the annular mounting cavity 211 is connected to the input end of the reduction mechanism 30 .

[0052] Optionally, a first bearing is provided between the first sub-shell of the motor housing 21 and the portion of the motor rotor 23 extending out of the annular mounting cavity 211; a second bearing is provided between the second sub-shell of the motor housing 21 and the portion of the motor rotor 23 extending out of the annular mounting cavity 211. This design facilitates the rotation of the motor rotor 23 relative to the motor housing 21.

[0053] The speed reduction mechanism 30 is in the installation groove 212 . It can be understood that the speed reduction mechanism 30 can be sunk into the installation groove 212 ; or, the speed reduction mechanism 30 can be flush with the notch of the installation groove 212 ; or, the speed reduction mechanism 30 can protrude from the notch of the installation groove 212 .

[0054] Optionally, the motor housing 21 is directly fixedly connected to the vehicle body. For example, the motor housing 21 is provided with a plurality of fixing holes 214 , which are located on the side of the motor housing 21 facing away from the spoke 12 , and the motor housing 21 is connected to the vehicle body through the plurality of fixing holes 214 .

[0055] Since the motor housing 21 is directly fixedly connected to the vehicle body, the motor rotor 23 and the rotating parts of the reduction mechanism 30 rotate relative to the motor housing 21. Therefore, the embodiment of the present application does not need to additionally set up a spindle in the prior art to fix the motor stator 22, the motor housing 21 and other components. That is, the motor housing 21 and the motor stator 22 can be integrated into a whole and fixed on the vehicle body, and the "whole" also integrates the function of the spindle, which can effectively simplify the structure of the wheel 100.

[0056] Furthermore, the reduction mechanism 30 is located in the mounting groove 212 of the motor housing 21 , which can reduce the space occupied by the hub motor 20 and the reduction mechanism 30 in the wheel hub 10 , and is beneficial for the arrangement of other components (such as the brake mechanism 40 ) in the wheel hub 10 .

[0057] Please also refer to Figure 1 , Figure 4 and Figure 5 In some embodiments, the brake mechanism 40 includes a brake caliper 42 and a brake disc 41 . The brake disc 41 is an annular disc. The brake disc 41 is fixed on the rim 11 . The jaw 421 of the brake caliper 42 faces away from the center line of the rim 11 .

[0058] Optionally, the brake disc 41 is fixed on the inner wall surface of the rim 11. For example, a plurality of fixing protrusions 111 are provided on the inner wall surface of the rim 11, and the plurality of fixing protrusions 111 are arranged at intervals along the circumferential direction of the rim 11; the brake disc 41 includes an annular plate 411 and a plurality of connecting plates 412 provided at the outer edge of the annular plate 411, and the plurality of connecting plates 412 are respectively arranged corresponding to the plurality of fixing protrusions 111. Among them, the two side surfaces of the annular plate 411 in its axial direction are the two large surfaces of the annular plate 411.

[0059] Optionally, connecting holes are provided on both the fixing protrusion 111 and the connecting plate 412, and fasteners pass through the connecting holes on the fixing protrusion 111 and the connecting plate 412 to fix the brake disc 41 on the rim 11. It can be understood that the included angle between the connecting plate 412 and the annular plate 411 can be 180°. At this time, the connecting hole on the fixing protrusion 111 extends along the axial direction of the hub 10, and the connecting hole on the connecting plate 412 extends along the axial direction of the annular plate 411; or, the included angle between the connecting plate 412 and the annular plate 411 can be 90°. At this time, the connecting hole on the fixing protrusion 111 extends along the radial direction of the hub 10, and the connecting hole on the connecting plate 412 extends along the radial direction of the annular plate 411.

[0060] The jaws 421 of the brake caliper 42 face away from the center line of the rim 11. It can be understood that when the brake caliper 42 cooperates with the brake disc 41, the brake caliper 42 is first placed integrally on the radial inner side of the annular plate 411, and then moved to the radial outer side of the annular plate 411, so that the two brake pads of the brake caliper 42 are on both axial sides of the annular plate 411; when the brake caliper 42 works, the annular plate 411 is clamped by the two brake pads to brake the hub 10, thereby realizing the braking of the electric vehicle. Since the initial position of the brake caliper 42 is located on the radial inner side of the annular plate 411, in this way, the space on the radial inner side of the annular plate 411 can be effectively utilized to accommodate the brake caliper 42, the occupation of the radial space of the hub 10 by the brake caliper 42 can be effectively reduced, there is no need to increase the radial dimension of the hub 10 to accommodate the brake caliper 42, which is beneficial to saving the radial space of the hub 10 and improving the space utilization rate inside the hub 10.

[0061] Optionally, the shape of the annular plate 411 is a circular annular plate.

[0062] It can be understood that the connecting plate 412 can be integrally formed with the annular plate 411; or, the connecting plate 412 can also be fixed on the annular plate 411. For example, the connecting plate 412 can be fixed on the annular plate 411 by welding, fastener connection, clamping, interference connection, press connection, etc.

[0063] It can be understood that the fixing protrusion 111 can be integrally formed with the rim 11; or, the fixing protrusion 111 can also be fixed on the rim 11. For example, the fixing protrusion 111 can also be fixed on the rim 11 by welding, fastener connection, clamping, interference connection, press connection, etc.

[0064] The brake disc 41 is an annular disc, and other components can be placed in its middle position to improve the space utilization rate inside the wheel hub 10. Moreover, the braking point of the brake caliper 42 is relatively close to the rim 11, increasing the braking torque, so that the electric vehicle requires less frictional force to stop within a certain period of time. Since less frictional force is required, the brake disc 41 can be made thinner and lighter to achieve the purpose of weight reduction, thereby reducing the unsprung mass of the electric vehicle and increasing the comfort of the electric vehicle.

[0065] In other embodiments, the brake disc 41 can be a disc and fixed on the motor rotor 23. The jaws 421 of the brake caliper 42 face the center line of the rim 11. It can be understood that when the brake caliper 42 cooperates with the brake disc 41, the brake caliper 42 is first placed entirely on the radial outer side of the brake disc 41, and then moved radially inward of the brake disc 41 so that the two brake pads of the brake caliper 42 are on the axial two sides of the brake disc 41.

[0066] Please also refer to Figure 1 and Figure 2 , in some embodiments, the brake caliper 42 is fixed on the outer wall surface of the motor housing 21 facing away from the wheel spoke 12.

[0067] Optionally, the motor housing 21 includes fixing posts 213, the brake caliper 42 includes connecting portions 422, the fixing posts 213 are provided with third threaded holes, the connecting portions 422 are provided with third through holes, and third fastening screws pass through the third through holes and are screwed into the third threaded holes to fix the brake caliper 42 on the motor housing 21.

[0068] Among them, there are multiple fixing posts 213 and connecting portions 422, for example, two, to ensure the stability of the brake caliper 42 fixed on the motor housing 21.

[0069] By fixing the brake caliper 42 on the motor housing 21, when installing the wheel 100, it is only necessary to fix the motor housing 21 of the in-wheel motor 20 on the vehicle body, making the installation of the wheel 100 relatively simple.

[0070] In other embodiments, the brake caliper 42 can be fixed on the vehicle body.

[0071] Please refer to Figure 5 , in some embodiments, the motor rotor 23 is a bowl-shaped structure, and a middle convex portion 216 and an edge concave portion 215 are formed on one side surface of the motor housing 21 facing away from the wheel spoke 12. The middle convex portion 216 and the installation groove 212 are arranged corresponding to each other in the axial direction of the in-wheel motor 20, and the edge concave portion 215 is used to avoid the brake caliper 42.

[0072] The motor housing 21 includes a first sub-housing and a second sub-housing fixed together. The first sub-housing is located between the spoke 12 and the second sub-housing. An intermediate convex portion 216 and a peripheral concave portion 215 are formed on the second sub-housing.

[0073] Optionally, the peripheral concave portion 215 is an annular concave portion arranged around the intermediate convex portion 216. Such a design makes the shape of the motor housing 21 substantially a centrosymmetric structure, thereby better adapting to the centrosymmetric structure of the motor rotor 23.

[0074] Among them, the fixing hole 214 is opened on the intermediate convex portion 216.

[0075] Among them, when the brake caliper 42 is fixed on the outer wall surface of the motor housing 21 facing away from the spoke 12, the fixing post 213 is arranged on the peripheral concave portion 215.

[0076] By adopting the above technical solution, the intermediate convex portion 216 and the mounting groove 212 are arranged corresponding to each other, which can increase the depth of the mounting groove 212, facilitating the arrangement of a one-stage or multi-stage reduction mechanism 30 in the mounting groove 212; moreover, the peripheral concave portion 215 can avoid the brake caliper 42, making the axial space utilization rate of the wheel 100 higher.

[0077] Please also refer to Figure 3 、 Figure 5 and Figure 6 In some embodiments, the reduction mechanism 30 includes a fixed cylinder 31, a planet carrier 32, a plurality of planet gears 33, and a sun gear shaft 34. The fixed cylinder 31 is fixed in the mounting groove 212. The fixed cylinder 31 includes a cylinder body 311 and an internal gear ring 312 provided on the inner wall surface of the cylinder body 311. The planet carrier 32 is located inside the cylinder body 311 and is fixedly connected to the spoke 12. The plurality of planet gears 33 are respectively rotatably mounted on the planet carrier 32 and mesh with the internal gear ring 312. The sun gear shaft 34 is fixed on the motor rotor 23 and meshes with the plurality of planet gears 33.

[0078] Among them, the fixed cylinder 31 is fixed in the mounting groove 212, that is, the fixed cylinder 31 is stationary relative to the motor housing 21; it can be understood that the fixed cylinder 31 can be fixed in the mounting groove 212 by means of welding, fastener connection, clamping, press fitting, interference connection, etc.

[0079] It can be understood that the axial length of the fixed cylinder 31 can be equal to the groove depth of the mounting groove 212, the axial length of the fixed cylinder 31 can also be less than the groove depth of the mounting groove 212, and the axial length of the fixed cylinder 31 can also be greater than the groove depth of the mounting groove 212.

[0080] It can be understood that the internal gear ring 312 and the cylinder body 311 can be integrally formed; alternatively, the internal gear ring 312 can be fixed within the cylinder body 311. For example, the internal gear ring 312 is fixed within the cylinder body 311 by means such as welding, fastener connection, snap connection, press connection, interference connection, etc. Optionally, the internal gear ring 312 is located on the inner wall surface at one axial end of the cylinder body 311.

[0081] The planet carrier 32 is located within the cylinder body 311 and can rotate relative to the cylinder body 311. Optionally, a third bearing is provided between the planet carrier 32 and the cylinder body 311 to facilitate the rotation of the planet carrier 32 and at the same time provide a certain supporting effect on the planet carrier 32. Among them, the planet carrier 32 constitutes the output end of the above-mentioned reduction mechanism 30.

[0082] It can be understood that the planet carrier 32 can be directly fixedly connected to the spoke 12 or indirectly fixedly connected to the spoke 12.

[0083] A plurality of planet gears 33 are respectively rotatably mounted on the planet carrier 32. It can be understood that the number of planet gears 33 can be two or three or more. Optionally, the plurality of planet gears 33 are evenly and spaced along the circumferential direction of the planet carrier 32 on the planet carrier 32.

[0084] The sun gear shaft 34 is located at the central position of the reduction mechanism 30. Optionally, the sun gear shaft 34 includes a shaft body and a tooth portion integrally formed on the shaft body. The tooth portion is used for meshing with the plurality of planet gears 33. The shaft body is fixedly connected to the motor rotor 23. Since the tooth portion is directly integrally formed on the shaft body, the number of components is reduced, which is beneficial to the assembly of the reduction mechanism 30. Among them, the sun gear shaft 34 constitutes the input end of the above-mentioned reduction mechanism 30.

[0085] Among them, the motor housing 21 is fixed to the vehicle body; the brake caliper 42 can be fixed to the motor housing 21 to be indirectly fixed to the vehicle body, or alternatively, the brake caliper 42 can also be directly fixed to the vehicle body.

[0086] In this embodiment, the fixed cylinder 31 is fixed in the installation groove 212 of the motor housing 21, the motor stator 22 is fixed on the inner wall surface of the annular installation cavity 211 of the motor housing 21, the brake caliper 42 is fixed on the motor housing 21, and the motor housing 21 is directly fixedly connected to the vehicle body. In this way, the hub motor 20, the speed reduction mechanism 30, and the brake mechanism 40 of the wheel 100 are fixed on the vehicle body; the motor rotor 23 drives the sun gear shaft 34 to rotate, the sun gear shaft 34 drives the planet gear 33 to rotate, the planet gear 33 drives the planet carrier 32 to rotate together, the planet carrier 32 drives the hub 10 to rotate, the hub 10 drives the brake disc 41 to rotate, and the brake disc 41 can be braked by the brake caliper 42. In this way, the start and stop of the wheel 100 are realized. Based on the above settings, combined with the solution that "the hub motor 20, the speed reduction mechanism 30, and the brake mechanism 40 are all on the same side of the wheel spoke 12", the embodiment of the present application designs the hub 10, the hub motor 20, the speed reduction mechanism 30, and the brake mechanism 40 of the wheel 100 as a complete integral module, and each mechanism (hub 10, hub motor 20, speed reduction mechanism 30, and brake mechanism 40) of this module is independent of each other and related to each other. Therefore, the complete modular wheel 100 can be disassembled and assembled as a whole, that is, the integral module formed by the hub 10, the hub motor 20, the speed reduction mechanism 30, and the brake mechanism 40 can be disassembled and assembled as a whole, and each mechanism of this module, that is, between the hub 10, the hub motor 20, the speed reduction mechanism 30, and the brake mechanism 40, can also be independently replaced, disassembled, and assembled.

[0087] In other embodiments, the speed reduction mechanism 30 includes a sun gear and a connecting shaft, the sun gear is fixed on the connecting shaft by means of welding, clamping, fastener connection, press fitting, interference connection, etc., and the connecting shaft is fixedly connected to the motor rotor 23. Alternatively, the speed reduction mechanism 30 includes a sun gear but does not include a connecting shaft, and the sun gear is directly fixedly connected to the motor rotor 23.

[0088] Please also refer to Figure 5 and Figure 6 , in some embodiments, the planet carrier 32 is a cylindrical structure, a plurality of planet gears 33 are respectively rotatably installed at one end of the planet carrier 32 away from the wheel spoke 12, and one end of the planet carrier 32 close to the wheel spoke 12 is a closed structure.

[0089] Optionally, a plurality of mounting posts 322 arranged at intervals along the circumferential direction of the planet carrier 32 are provided inside the planet carrier 32, each mounting post 322 extends along the axial direction of the planet carrier 32, and a plurality of planet gears 33 are respectively rotatably installed on the plurality of mounting posts 322.

[0090] Since one end of the planet carrier 32 close to the wheel spoke 12 is a closed structure, foreign impurities are not easily introduced into the interior of the speed reduction mechanism 30, avoiding the influence on the meshing of the planet gear 33 and the sun gear shaft 34.

[0091] Please also refer to Figure 2 、 Figure 5 and Figure 6 In some embodiments, the planet carrier 32 has a plurality of first threaded holes 321 arranged at intervals along its circumferential direction, the spoke 12 has a plurality of first through holes 121 arranged at intervals along its circumferential direction, the wheel 100 further includes a plurality of first fastening screws, and the plurality of first fastening screws respectively pass through the plurality of first through holes 121 and are respectively screwed into the plurality of first threaded holes 321 to realize the fixed connection between the spoke 12 and the planet carrier 32.

[0092] Optionally, the plurality of first threaded holes 321 are provided on the closed structure of the planet carrier 32. In order to ensure the depth of the first threaded holes 321 and increase the reliability of the connection, connection protrusions 323 can be provided at positions corresponding to the first threaded holes 321 on the inner side of the closed structure; of course, the mounting posts 322 inside the planet carrier 32 can also be used as the connection protrusions 323. For example, there are six first threaded holes 321, and there are three mounting posts 322 and three connection protrusions 323 inside the planet carrier 32, and the three mounting posts 322 and the three connection protrusions 323 are alternately arranged in the circumferential direction of the planet carrier 32.

[0093] The spoke 12 and the planet carrier 32 are fixedly connected by the first fastening screws, so that the connection between the spoke 12 and the planet carrier 32 is relatively simple, which is beneficial to the disassembly and replacement of the hub 10; moreover, the spoke 12 is directly fixed on the planet carrier 32, avoiding many intermediate transmission parts, and thus the force transmission efficiency is relatively high.

[0094] Please also refer to Figure 3 、 Figure 5 and Figure 6 In some embodiments, the sun gear shaft 34 has a second threaded hole 341 extending along its axial direction, the motor rotor 23 has a second through hole 231 penetrating along its axial direction, the wheel 100 further includes a second fastening screw, and the second fastening screw passes through the second through hole 231 and is screwed into the second threaded hole 341 to realize the fixed connection between the sun gear shaft 34 and the motor rotor 23; a rotation prevention structure is provided between the sun gear shaft 34 and the motor rotor 23.

[0095] Wherein, the orifice of the second threaded hole 341 faces away from the spoke 12.

[0096] Optionally, a jack with an opening facing the spoke 12 is provided on the motor rotor 23, and the jack communicates with the second through hole 231. The anti-rotation structure includes a first keyway, a second keyway, and a key 342. The first keyway is provided on the outer wall surface of the sun gear shaft 34, and the second keyway is provided on the wall of the jack. The sun gear shaft 34 is inserted into the jack and is in anti-rotation cooperation with the motor rotor 23 through the key 342 to achieve synchronous rotation of the sun gear shaft 34 and the motor rotor 23. Of course, the anti-rotation structure may not include the first keyway, and the key 342 may be integrally formed on the outer wall surface of the sun gear shaft 34, or the key 342 may be fixed to the outer wall surface of the sun gear shaft 34 by means of welding, fastener connection, etc.

[0097] The sun gear shaft 34 and the motor rotor 23 are fixedly connected by a second fastening screw, making the connection between the sun gear shaft 34 and the motor rotor 23 relatively simple.

[0098] In other embodiments, the sun gear shaft 34 may be fixedly connected to the motor rotor 23 by means of clamping, press-fitting, welding, interference connection, etc.

[0099] A second aspect of the present application provides an electric vehicle. The electric vehicle includes the wheel 100 as described in the first aspect to achieve two-wheel drive of the front wheels, two-wheel drive of the rear wheels, and four-wheel drive of the electric vehicle.

[0100] The electric vehicle adopts any one or more embodiments of the above-mentioned wheel 100, and thus has the beneficial effects of the above embodiments, which will not be elaborated here one by one.

[0101] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A wheel, characterized in that: It includes a wheel hub, a wheel hub motor, a speed reduction mechanism and a brake mechanism. The wheel hub includes a rim and spokes. The rim and the spokes form a placement cavity. The wheel hub motor, the speed reduction mechanism and the brake mechanism are all located in the placement cavity and on the same side of the spokes. The wheel hub motor includes a motor rotor, and the motor rotor is connected to the spokes through the speed reduction mechanism.

2. The wheel according to claim 1, characterized in that: The hub motor also includes a motor housing and a motor stator. The motor housing has an annular mounting cavity and a mounting groove opening toward the spoke. The motor stator and a portion of the motor rotor are located in the annular mounting cavity. Another portion of the motor rotor extends out of the annular mounting cavity and is connected to the reduction mechanism. The reduction mechanism is located in the mounting groove.

3. The wheel according to claim 2, characterized in that: The brake mechanism comprises a brake caliper and a brake disc. The brake disc is an annular disc fixed on the wheel rim. The jaws of the brake caliper face away from the center line of the wheel rim.

4. The wheel according to claim 3, characterized in that: The brake caliper is fixed on the outer wall surface of the motor housing facing away from the wheel spoke.

5. The wheel according to claim 3, characterized in that: The motor rotor is a bowl-shaped structure, and a middle convex portion and an edge concave portion are formed on the side of the motor housing facing away from the spoke. The middle convex portion and the mounting groove are arranged correspondingly in the axial direction of the hub motor, and the edge concave portion is used to avoid the brake caliper.

6. The wheel according to any one of claims 2 to 5, characterized in that: The reduction mechanism includes a fixed cylinder, a planetary carrier, a plurality of planetary gears and a sun gear shaft. The fixed cylinder is fixed in the mounting groove. The fixed cylinder includes a cylinder body and an inner gear ring arranged on the inner wall surface of the cylinder body. The planetary carrier is located in the cylinder body and fixedly connected to the spokes. The plurality of planetary gears are rotatably mounted on the planetary carrier and meshed with the inner gear ring. The sun gear shaft is fixed on the motor rotor and meshed with the plurality of planetary gears.

7. The wheel according to claim 6, characterized in that: The planet carrier is a cylindrical structure, and the plurality of planetary wheels are rotatably mounted on one end of the planet carrier away from the spokes, and one end of the planet carrier close to the spokes is a closed structure.

8. The wheel according to claim 6, characterized in that: The planet carrier has a plurality of first threaded holes arranged at intervals along its circumference, the spokes have a plurality of first through holes arranged at intervals along its circumference, and the wheel also includes a plurality of first fastening screws, which respectively pass through the plurality of first through holes and are respectively screwed into the plurality of first threaded holes to achieve fixed connection between the spokes and the planet carrier.

9. The wheel according to claim 6, characterized in that: The sun gear shaft has a second threaded hole extending along its axial direction, the motor rotor has a second through hole extending along its axial direction, and the wheel also includes a second fastening screw, which passes through the second through hole and is screwed into the second threaded hole to achieve a fixed connection between the sun gear shaft and the motor rotor; a stop structure is also provided between the sun gear shaft and the motor rotor.

10. An electric vehicle, characterized in that: Comprising the wheel as claimed in any one of claims 1-9.

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