Hub motor

Abstract

The utility model discloses a wheel hub motor. The hub motor comprises a motor body and a control device, the motor body comprises a shaft body and a first shell structure arranged on the shaft body in a sleeving mode, and the rear end, in the axial direction of the shaft body, of the first shell structure is arranged in an open mode; the control device comprises a circuit structure and a second shell structure, the second shell structure covers the open position of the rear end of the first shell structure so that the circuit structure can be covered with the second shell structure, and the front end, in the axial direction of the shaft body, of the second shell structure is open and is opposite to the open position of the rear end of the first shell structure. According to the hub motor provided by the utility model, at least partial shells of the motor main body and the control device are shared, the structure is more compact, the motor main body and the control device are better integrated together, and the size and the weight of the hub motor are effectively reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of motors, specifically to a hub motor. Background Technology

[0002] In-wheel motor technology, also known as wheel-mounted motor technology, is characterized by integrating the power unit, transmission unit, and braking unit all within the wheel hub, greatly simplifying the mechanical components of electric vehicles. However, current in-wheel motor systems house the motor, control unit, and other components in separate cavities, resulting in a large number of cavities. This makes in-wheel motors space-consuming and heavy, hindering the miniaturization and weight reduction requirements of in-wheel motors. Utility Model Content

[0003] In order to solve the above-mentioned technical problems, the main purpose of this utility model is to provide a hub motor that aims to solve the problems of traditional hub motors being large in size and heavy in weight, which is not conducive to the miniaturization and lightweighting of hub motors.

[0004] To achieve the above objectives, this utility model proposes a hub motor, comprising:

[0005] The motor body includes a shaft and a first housing structure sleeved on the shaft, wherein the rear end of the first housing structure is open along the axial direction of the shaft;

[0006] The control device includes a circuit structure and a second housing structure. The second housing structure covers the open rear end of the first housing structure to enclose the circuit structure. The front end of the second housing structure is open along the axial direction of the shaft and is opposite to the open rear end of the first housing structure.

[0007] Optionally, the first housing structure and the second housing structure are arranged side-by-side and fitted together along the axial direction of the shaft; and / or,

[0008] The shape of the first shell structure is adapted to the shape of the second shell structure.

[0009] Optionally, the first housing structure includes a motor housing and a front cover disposed at the front end of the motor housing;

[0010] The second housing structure includes a control housing and a rear end cover located at the rear end of the control housing;

[0011] The motor housing and the control housing are detachably connected; or...

[0012] The motor housing and the control housing are integrally formed.

[0013] Optionally, the hub motor further includes a flexible cable, and the motor body further includes an electrical connection post disposed within the first housing structure. The circuit structure and the electrical connection post are electrically connected through the flexible cable.

[0014] Optionally, the flexible cable is provided with a first connection hole, and the electrical connection post is provided with a second connection hole;

[0015] The hub motor also includes a connector, which passes through the first connection hole and the second connection hole and presses the end face of the flexible cable with the first connection hole onto the end of the electrical connection post.

[0016] Optionally, a first cooling channel is formed within the control device, and a second cooling channel is formed within the motor body, wherein the first cooling channel and the second cooling channel are connected in series.

[0017] Optionally, the first cooling channel has a first inlet and a first outlet, the second cooling channel has a second inlet and a second outlet, and the first outlet and the second inlet are connected; the first inlet is located on the outside of the second housing structure, the second outlet is located on the outside of the first housing structure, and the first inlet and the second outlet are located on the same side of the shaft.

[0018] Optionally, the hub motor further includes a transfer pipe that connects the first outlet and the second inlet and passes through the first housing structure and the second housing structure.

[0019] Optionally, the first outlet and the second inlet are respectively provided on the surfaces of the first shell structure and the second shell structure that are arranged opposite to each other, and the transfer pipe passes through the first outlet and the second inlet;

[0020] The hub motor also includes a seal, which is sleeved on the outside of the adapter pipe and located in the gap between the first outlet and the adapter pipe, and in the gap between the second inlet and the adapter pipe.

[0021] Optionally, the control device further includes a heat sink disposed on one side of the circuit structure, at least a portion of which is located within the first cooling channel.

[0022] The technical solution provided by this utility model has the following beneficial effects:

[0023] The hub motor provided by this utility model includes a motor body and a control device. The motor body includes a shaft and a first housing structure. The control device includes a circuit structure and a second housing structure. The first and second housing structures are connected side-by-side along the axial direction of the shaft. The rear end of the first housing structure is open along the axial direction, and the front end of the second housing structure is open along the axial direction. The first and second housing structures are connected to each other, with the second housing structure acting as the rear cover of the first housing structure and the first housing structure acting as the front cover of the second housing structure, thereby enclosing the circuit structure and other components. This simplifies the first and second housing structures and reduces their weight. The first and second housing structures can fit together better, allowing for better integration of the motor body and control device, resulting in a more compact structure and effectively reducing the overall size and weight of the hub motor. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 A schematic diagram of an embodiment of a hub motor provided by this utility model;

[0026] Figure 2 for Figure 1 Another structural diagram of the hub motor described in the article;

[0027] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure along the AA direction;

[0028] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure along the BB direction;

[0029] Figure 5 for Figure 1 Another structural diagram of the hub motor described in the article;

[0030] Figure 6 for Figure 5 A schematic diagram of the cross-sectional structure along the CC direction.

[0031] Explanation of icon numbers:

[0032] 100-Hub motor; 1-Motor body; 11-Shaft; 12-First housing structure; 121-Motor housing; 1211-Second inlet; 1212-Second outlet; 122-Front end cover; 123-Electrical connection post; 13-Iron core winding; 2-Control device; 21-Circuit structure; 22-Second housing structure; 221-Control housing; 2211-First inlet; 2212-First outlet; 222-Rear end cover; 3-Flexible cable; 4-Connector; 5-Adapter pipe; 6-Seal.

[0033] The realization of the purpose, functional characteristics and excellent effects of this utility model will be further explained below in conjunction with specific embodiments and accompanying drawings. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] It should be noted that if the embodiments of this utility model involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0036] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0037] This utility model provides a hub motor 100. For details, please refer to [link / reference needed]. Figure 1 and Figure 2In this embodiment, the hub motor 100 includes a motor body 1 and a control device 2. The motor body 1 includes a shaft 11 and a first housing structure 12 sleeved on the shaft 11. The rear end of the first housing structure 12 is open along the axial direction of the shaft 11. The control device 2 includes a circuit structure 21 and a second housing structure 22. The second housing structure 22 covers the rear open portion of the first housing structure 12 to enclose the circuit structure 21. The front end of the second housing structure 22 is open along the axial direction of the shaft 11 and is opposite to the rear open portion of the first housing structure 12.

[0038] In this embodiment, the first housing structure 12 and the second housing structure 22 are connected side-by-side along the axial direction of the shaft 11. The first housing structure 12 is open at its rear end along the axial direction, and the second housing structure 22 is open at its front end along the axial direction. The first housing structure 12 and the second housing structure 22 are connected to each other, with the second housing structure 22 acting as the rear cover of the first housing structure 12 and the first housing structure 12 acting as the front cover of the second housing structure 22, thereby enclosing the circuit structure 21 and other components. This simplifies the first housing structure 12 and the second housing structure 22 and reduces their weight, allowing the first housing structure 12 and the second housing structure 22 to fit together better. This allows for better integration of the motor body 1 and the control device 2, resulting in a more compact structure and effectively reducing the overall size and weight of the hub motor 100.

[0039] It should be noted that, when the hub motor 100 is operating normally, the shaft 11 of the hub motor 100 is arranged horizontally and specifically extends in the front-rear direction, with the first housing structure 12 located at the front end of the second housing structure 22. Therefore, unless otherwise specified, all descriptions of orientation in this utility model shall be taken as above.

[0040] Preferably, combined with Figure 1 and Figure 3 As shown, the first housing structure 12 and the second housing structure 22 are arranged side by side along the axial direction of the shaft 11. Specifically, the rear end face of the first housing structure 12 is attached to the front end face of the second housing structure 22, which makes the motor body 1 and the control device 2 more compact and the overall size of the hub motor 100 smaller.

[0041] It is understood that the shapes of the first shell structure 12 and the second shell structure 22 are not specifically limited, so that both the first shell structure 12 and the second shell structure 22 having an inner cavity should fall within the scope of protection of this application. Preferably, the first shell structure 12 is generally a cylindrical shape with an open rear end, and the second shell structure 22 is generally a cylindrical shape with an open front end. Preferably, the shapes of the first shell structure 12 and the second shell structure 22 are adapted to each other, so that the rear end face of the first shell structure 12 and the front end face of the second shell structure 22 fit more tightly, the sealing performance is better, and the structure is smoother and more aesthetically pleasing.

[0042] The motor body 1 may further include a stator structure and a rotor structure housed within the first housing structure 12. The stator structure may include an iron core and coils, with the coils wound around the outer periphery of the iron core to form an iron core winding 13. The first housing structure 12 and the second housing structure 22 define an accommodating space for the circuit structure 21, the stator structure, and the rotor structure, and protect the circuit structure 21, the stator structure, and the rotor structure through the first housing structure 12 and the second housing structure 22. Therefore, the specific arrangement of the first housing structure 12 and the second housing structure 22 will differ for different circuit structures 21, stator structures, and rotor structures, and their internal structures can be adaptively adjusted.

[0043] Specifically, in combination Figure 3 and Figure 4 As shown, for the first housing structure 12 and the second housing structure 22, the first housing structure 12 includes a motor housing 121 and a front cover 122 located at the front end of the motor housing 121. When assembling the motor body 1, the stator structure and / or rotor structure can be assembled onto the motor housing 121 or the front cover 122 first, and then the front cover 122 can be placed on the motor housing 121 to form the motor body 1. This makes the assembly operation of the motor body 1 not limited by the internal space of the motor housing 121, making the assembly operation more convenient and the assembly efficiency higher.

[0044] Similarly, the second housing structure 22 includes a control housing 221 and a rear cover 222 located at the rear end of the control housing 221. When assembling the control device 2, the circuit structure 21 can be assembled onto the control housing 221 or the rear cover 222 first, and then the rear cover 222 and the control housing 221 can be connected and assembled to form the control device 2. This makes the assembly operation not limited by the internal space of the control housing 221, making the assembly operation more convenient and the assembly efficiency higher.

[0045] Furthermore, preferably, the motor housing 121 and the control housing 221 are detachably connected to facilitate better disassembly and assembly of the motor body 1 and the control device 2, and also to facilitate the inspection and maintenance of internal components. Specifically, the motor housing 121 and the control housing 221 can be connected by bolts. A plurality of first mounting holes are evenly distributed in the circumference of the motor housing 121, and a plurality of second mounting holes are evenly distributed in the circumference of the control housing 221. A plurality of bolts are inserted one-to-one into the plurality of first mounting holes and the plurality of second mounting holes, thereby connecting and fixing the motor housing 121 and the control housing 221, ensuring reliable connection at all points in the circumference of the motor housing 121 and the control housing 221.

[0046] In another embodiment, the motor housing 121 and the control housing 221 can also be integrally formed. During assembly, the stator structure and rotor structure can be assembled into the motor housing 121 from the front end, and the circuit structure 21 can be assembled into the control housing 221 from the rear end. Finally, the front end cover 122 is placed on the motor housing 121, and the rear end cover 222 is placed on the control housing 221, thereby realizing the assembly of the hub motor 100, reducing the assembly steps of the motor housing 121 and the control housing 221, and making the sealing more reliable.

[0047] The hub motor 100 also includes a flexible cable 3, and the motor body 1 also includes an electrical connection post 123 disposed in the first housing structure 12. The circuit structure 21 and the electrical connection post 123 are electrically connected through the flexible cable 3, thereby enabling the control device 2 to be electrically connected to the motor body 1. The operation of the motor body 1 can be better controlled through the control device 2.

[0048] Preferably, combined with Figure 5 and Figure 6 As shown, the flexible cable 3 has a first connecting hole, and the electrical connection post 123 has a second connecting hole. The hub motor 100 also includes a connector 4, which passes through the first and second connecting holes and presses the end face of the flexible cable 3 with the first connecting hole to the end of the electrical connection post 123. The connector 4 can be a bolt, which passes through the first connecting hole and is screwed into the second connecting hole. The flexible cable 3 is a copper cable, and the terminals are the three-phase terminals of the motor. The conductor surface of the copper cable is pressed to the end of the terminal by a stud, ensuring the reliability of the mating surface and making the electrical connection between the control device 2 and the motor body 1 more stable and reliable, and also making the connection and assembly more convenient.

[0049] The circuit structure 21 may include a circuit board and components disposed on the circuit board. The hub motor 100 also includes insulating paper, which is disposed between the circuit board and the flexible ribbon cable 3 to prevent the flexible ribbon cable 3 from making miscommunication with the circuit board.

[0050] Because the control device 2 generates relatively a lot of heat during operation, and after being connected to the motor body 1, the heat will be conducted into the motor body 1. To ensure that both the control device 2 and the motor body 1 can operate better, a first cooling channel is formed within the control device 2. This first cooling channel bypasses the heat-generating components within the control device 2, especially on the circuit structure 21, and carries away the heat through the coolant within the first cooling channel. A second cooling channel is formed within the motor body 1. This second cooling channel bypasses the heat-generating components within the motor body 1, and carries away the heat from the motor body 1 through the coolant within the second channel. Moreover, the first and second cooling channels are connected in series, which is equivalent to a single oil circuit that achieves cooling for both the control device 2 and the motor body 1. This simplifies the cooling structure, makes the overall structure of the hub motor 100 simpler, and thus reduces its overall weight.

[0051] The coolant can be cooling oil or cooling water, etc. Taking cooling oil as an example, specifically, the first cooling channel has a first inlet 2211 and a first outlet 2212, and the second cooling channel has a second inlet 1211 and a second outlet 1212, with the first outlet 2212 and the second inlet 1211 connected. In use, the cooling oil enters the first cooling channel through the first inlet 2211, carrying away heat from the control device 2 as it flows through the first cooling channel. The cooling oil then flows from the first outlet 2212 into the second inlet 1211 to enter the second cooling channel, carrying away heat from the motor body 1 as it flows through the second cooling channel. Finally, it flows out from the second outlet 1212, thus achieving the cooling of the control device 2 and the motor body 1. Preferably, combined with... Figure 1 and Figure 2 As shown, the first inlet 2211 is located on the outside of the second housing structure 22, and the second outlet 1212 is located on the outside of the first housing structure 12. An oil inlet nozzle can be provided at the first inlet 2211, and an oil outlet nozzle can be provided at the second outlet 1212. The oil inlet nozzle facilitates connection to the outlet end of the external cooling oil circuit, and the oil outlet nozzle facilitates connection to the inlet end of the external cooling oil circuit, thus forming a cooling circulation path. This allows for continuous cooling of the control device 2 and the motor body 1 when the hub motor 100 is working, ensuring better cooling performance. Moreover, the first inlet 2211 and the second outlet 1212 are located on the same side of the shaft 11, making operation more convenient when connecting the oil inlet and outlet pipes respectively.

[0052] In one embodiment, the first outlet 2212 and the second inlet 1211 can be connected to each other via an outlet pipe and an inlet pipe, respectively, or the first outlet 2212 and the second inlet 1211 can be directly connected to each other.

[0053] Preferably, the hub motor 100 further includes a transfer pipe 5, which connects the first outlet 2212 and the second inlet 1211 and passes through the first housing structure 12 and the second housing structure 22. The transfer pipe 5 can ensure the reliability of the connection on the one hand, and on the other hand, make the precision requirements for the direct docking of the first outlet 2212 and the second outlet 1212 lower, thus making it easier to implement.

[0054] Furthermore, such as Figure 4 As shown, the first outlet 2212 and the second inlet 1211 are respectively provided on the surfaces of the first housing structure 12 and the second housing structure 22 that are arranged opposite to each other. Specifically, the first outlet 2212 is provided on the front end face of the control housing 221, and the second inlet 1211 is provided on the rear end face of the motor housing 121. The adapter pipe 5 is in the shape of a straight cylinder and is inserted into the first outlet 2212 and the second inlet 1211, thereby connecting the first outlet 2212 and the second inlet 1211. This ensures that the joint between the first outlet 2212 and the second inlet 1211 is not at the joint between the end faces of the control housing 221 and the motor housing 121, thus better preventing coolant leakage from the end face of the housing.

[0055] Moreover, such as Figure 4 As shown, the hub motor 100 also includes a seal 6, which is sleeved on the outside of the adapter pipe 5 and located in the gap between the first outlet 2212 and the adapter pipe 5, and in the gap between the second inlet 1211 and the adapter pipe 5, to ensure a better sealing effect and prevent coolant leakage.

[0056] In one embodiment, the sealing element 6 can be configured as a sealing sleeve, which is fitted over the outside of the adapter pipe 5. Preferably, the length of the sealing sleeve is adapted to the length of the adapter pipe 5 to ensure better sealing at all points where the adapter pipe 5 connects to the first outlet 2212 and the second inlet 1211. In another embodiment, the sealing element 6 can also be configured as multiple sealing rings, which are fitted over the outer periphery of the adapter pipe 5 and evenly spaced along the axial direction of the adapter pipe 5 to form a multi-layer seal.

[0057] In addition, the control device 2 also includes a heat sink located on one side of the circuit structure 21, which can quickly conduct heat from the circuit structure 21 to the first cooling channel. At least part of the heat sink is located within the first cooling channel, and the heat dissipation pins on the heat sink create a turbulence structure within the first cooling channel, thereby guiding the flow of coolant to enhance heat dissipation efficiency and improve the heat dissipation effect. This ensures that all parts of the hub motor 100 can operate within a suitable temperature range, resulting in better operational stability.

[0058] For the second cooling channel, since the stator coil generates a large amount of heat, the second cooling channel can mainly flow through the core winding 13 to remove the heat from the core winding 13. Specifically, the stator structure also includes a stator shell and multiple core windings 13. The multiple core windings 13 are arranged circumferentially around the shaft 11 inside the stator shell. A first channel is formed between the stator shell and the outer periphery of the multiple core windings 13. A second channel is formed between every two adjacent core windings 13. A third channel is formed on the inner ring side of the multiple core windings 13. The first channel, the multiple second channels, and the third channel form the main components of the first cooling channel. The stator housing has a liquid inlet and a liquid outlet. The first channel includes a first liquid inlet channel and a first liquid outlet channel. The first liquid inlet channel is connected to a portion of the second channel, and the first liquid outlet channel is connected to the remaining portion of the second channel. This allows the coolant entering the first liquid inlet channel from the liquid inlet to pass through multiple second channels into the third channel, and then through multiple other second channels into the first liquid outlet channel, and finally out of the liquid outlet. This allows the coolant to flow through multiple iron core windings 13 simultaneously, which can more efficiently remove heat from the iron core windings 13 and achieve cooling.

[0059] Preferably, in the plurality of iron core windings 13, the second channel between half of the iron core windings 13 allows the coolant flowing from the inlet into the first inlet channel to flow into the third channel, while the second channel between the other half of the iron core windings 13 allows the coolant in the third channel to flow towards the first outlet channel and out of the outlet. This allows the coolant, after entering the stator housing from the inlet, to flow along a portion of the plurality of second channels between adjacent iron core windings 13, carrying away some of the heat from the iron core windings 13. Then, it enters the inner ring side of the plurality of iron core windings 13, and then flows through the remaining plurality of second channels between the remaining iron core windings 13, carrying away the remaining heat from the iron core windings 13. Finally, it exits the stator housing through the outlet, achieving heat dissipation for all iron core windings 13. This results in high heat dissipation efficiency and good heat dissipation effect. The inlet can be connected to or integrated with the second inlet 1211 of the first cooling channel, and the outlet can be connected to or integrated with the second outlet 1212 of the first cooling channel.

[0060] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structure made using the contents of the present utility model specification and drawings, or directly or indirectly applied to other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A wheel hub motor, characterized by, The motor hub motor further comprises a flexible flat cable, the motor body further comprises an electrical connection column arranged in the first shell structure, and the electrical connection column and the circuit structure are electrically connected through the flexible flat cable. The flexible flat cable is provided with a first connecting hole, and the electrical connection column is provided with a second connecting hole. The motor hub motor further comprises a connecting piece, the connecting piece is arranged in the first connecting hole and the second connecting hole, and the end surface of the flexible flat cable provided with the first connecting hole is crimped to the end of the electrical connection column.

2. The wheel hub motor of claim 1, wherein, The control device is formed with a first cooling channel, and the motor body is formed with a second cooling channel, and the first cooling channel and the second cooling channel are connected in series. The first cooling channel has a first inlet and a first outlet, the second cooling channel has a second inlet and a second outlet, the first outlet and the second inlet are connected, the first inlet is arranged on the outside of the second shell structure, the second outlet is arranged on the outside of the first shell structure, and the first inlet and the second outlet are located on the same side of the shaft.

3. The in-wheel motor according to claim 1, characterized by The motor hub motor further comprises an adapter pipe, the adapter pipe connects the first outlet and the second inlet, and is arranged in the first shell structure and the second shell structure. The first outlet and the second inlet are respectively arranged on the surfaces of the first shell structure and the second shell structure which are arranged opposite to each other, and the adapter pipe is arranged in the first outlet and the second inlet. The motor hub motor further comprises a sealing member, the sealing member is arranged on the outside of the adapter pipe, and is located in the gap between the first outlet and the adapter pipe and in the gap between the second inlet and the adapter pipe. The control device further comprises a heat sink arranged on one side of the circuit structure, and at least part of the heat sink is located in the first cooling channel.

4. The in-wheel motor according to claim 1, characterized by ​ 5. The wheel hub motor of claim 4, wherein, ​ ​ 6. The in-wheel motor according to claim 1, characterized by ​ 7. The wheel hub motor of claim 6, wherein, ​ 8. The wheel hub motor of claim 7, wherein, ​ 9. The wheel hub motor of claim 8, wherein, ​ ​ 10. The in-wheel motor according to claim 6, characterized by ​

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