Drive system and electric two-wheeled vehicle

Abstract

The utility model discloses a driving system and an electric two-wheeled vehicle, and the driving system comprises a first housing in which a cooling structure is formed, and the cooling structure is configured to be a controller for the circulation of a liquid cooling medium, is arranged in the first housing, and is thermally coupled with the cooling structure; the motor body is arranged on the first machine shell, is electrically connected with the controller, is thermally coupled with the cooling structure and is provided with a second machine shell which is detachably connected with the first machine shell; the speed reducer body is arranged on the second machine shell and is in transmission connection with the motor body; and a heat conduction interface is formed between the first machine shell and the second machine shell, so that heat of the speed reducer body is transmitted to the cooling structure through the second machine shell and the heat conduction interface. By adopting the structure, the cooling performance is good, and the motor body, the controller and the speed reducer body can be cooled at the same time.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicle drive technology, and in particular to a drive system and an electric two-wheeler. Background Technology

[0002] The drive system of an electric two-wheeler typically consists of three parts: a motor, a controller, and a reducer. During operation, the drive system generates heat, and prolonged exposure to high temperatures can affect its performance and lifespan. For example, Chinese invention patent CN117748829A discloses an electric motorcycle drive system with an air-cooled outer panel to cool the motor and controller. However, the air-cooled structure has relatively poor heat dissipation performance and is also difficult to effectively cool the reducer.

[0003] Therefore, it is necessary to improve the existing technology to overcome the aforementioned defects. Utility Model Content

[0004] The purpose of this invention is to provide a drive system and an electric two-wheeler with excellent cooling performance, capable of simultaneously cooling the motor body, controller and reducer body.

[0005] The purpose of this utility model is achieved through the following technical solution: a drive system, comprising:

[0006] A first housing has a cooling structure formed therein, the cooling structure being configured to allow the circulation of liquid cooling medium.

[0007] The controller is disposed in the first housing and is thermally coupled to the cooling structure;

[0008] The motor body is disposed in the first housing, and is electrically connected to the controller and thermally coupled to the cooling structure.

[0009] The second housing is detachably connected to the first housing.

[0010] The reducer body is disposed in the second housing and is connected to the motor body for transmission.

[0011] A thermal interface is formed between the first housing and the second housing, allowing the heat from the reducer body to be transferred to the cooling structure via the second housing and the thermal interface.

[0012] Furthermore, the first housing includes:

[0013] The front housing includes a first part and a second part;

[0014] The rear housing includes a third part and a fourth part, and the front housing and the rear housing are adapted to be spliced ​​together so that the first part and / or the third part form a control housing for housing the controller, and the second part and the fourth part form a motor housing for housing the motor body;

[0015] The cooling structure includes a first cooling cavity located at the control housing and a second cooling cavity located at the motor housing, and the first cooling cavity and the second cooling cavity are connected.

[0016] Furthermore, the motor body is an axial flux motor with dual stators and a single rotor, and the cooling structure also includes a third cooling cavity located in the motor housing. The third cooling cavity is connected to the second cooling cavity, and the third cooling cavity and the second cooling cavity are respectively located on both sides of the motor body in the axial direction.

[0017] Furthermore, the first cooling chamber includes a first inlet channel and a first return channel, the second cooling chamber includes a second inlet channel and a second return channel, the outlet end of the first inlet channel is connected to the inlet end of the second inlet channel, the third cooling chamber includes a cooling channel, and one end of the first inlet channel, the second inlet channel, the cooling channel, the second return channel and the first return channel are connected in series, the other end of the first inlet channel is provided with a first liquid inlet, and the other end of the first return channel is provided with a first liquid outlet.

[0018] Furthermore, the first cooling chamber, the second cooling chamber, and the third cooling chamber are all provided with flow guiding structures to define the first inlet flow channel, the first return flow channel, the second inlet flow channel, the second return flow channel, and the cooling flow channel, respectively.

[0019] Furthermore, the first part is recessed inward from the end face away from the rear housing to form a first cooling groove, and a front cover plate is provided on the front housing. The front cover plate is adapted to cover the first cooling groove, and the first cooling groove and the front cover plate cooperate to form the first cooling cavity.

[0020] The third part is recessed inward from the end face away from the front housing to form a mounting groove, and a rear cover plate is provided on the rear housing. The rear cover plate is adapted to cover the mounting groove to form a control cavity for accommodating the controller.

[0021] A heat-conducting interface is formed between the control cavity and the first cooling cavity, and the second housing is disposed on the end face of the front housing away from the rear housing.

[0022] Furthermore, the second part is recessed inward from the end face away from the rear housing to form a second cooling groove, and a front cover plate is provided on the front housing. The front cover plate is adapted to cover the second cooling groove, and the second cooling groove and the front cover plate cooperate to form the second cooling cavity.

[0023] The fourth part is recessed inward from the end face away from the front housing to form a third cooling groove. A rear cover plate is provided on the rear housing. The rear cover plate is adapted to cover the third cooling groove. The third cooling groove and the rear cover plate cooperate to form a third cooling cavity. The third cooling cavity is connected to the second cooling cavity.

[0024] Furthermore, the second housing is disposed on the end face of the front housing opposite to the rear housing, and includes:

[0025] A reducer housing for housing the reducer body;

[0026] The center horizontal fork is integrated into the reducer housing;

[0027] The reducer housing and / or the middle horizontal fork are in close contact with the front cover plate.

[0028] Furthermore, the motor shaft of the motor body and the input shaft of the reducer body are integrally formed, and the ratio of the axial thickness of the motor body to that of the reducer body is 0.8:1 to 1.2:1.

[0029] In addition, this utility model also provides an electric two-wheeled vehicle, including the aforementioned drive system.

[0030] Compared with the prior art, the present invention has the following advantages: The present invention forms a cooling structure within the first housing for the circulation of liquid cooling medium. Simultaneously, the controller and motor body are thermally coupled to the cooling structure. The heat generated during the operation of the controller and motor body can be carried away by the liquid cooling medium, achieving direct heat dissipation for the controller and motor body. Compared to air-cooled structures, the heat dissipation effect is better. Furthermore, the controller and motor body are both located in the first housing, while the reducer body is located in the second housing. The first and second housings are detachably connected, facilitating the disassembly and maintenance of the drive system. During production, the motor and reducer components can be manufactured and tested in parallel, shortening the production cycle. Moreover, by thermally coupling the reducer body and the cooling structure through a thermally conductive interface, indirect heat dissipation of the reducer body can be achieved. The reducer body and / or the second housing do not require additional heat dissipation structures to achieve optimal heat dissipation. The structure is simple and effectively reduces redundant cooling pipe layout, lowering system complexity and the risk of fluid leakage. Attached Figure Description

[0031] Figure 1 This is a cross-sectional schematic diagram of the drive system of this utility model.

[0032] Figure 2 This is a schematic diagram of the structure of the drive system of this utility model when the first housing and the second housing are separated.

[0033] Figure 3 yes Figure 2 A structural diagram in another direction.

[0034] Figure 4 This is a structural schematic diagram of the rear housing of the drive system of this utility model when disassembled.

[0035] Figure 5 This is a structural schematic diagram of the front housing of the drive system of this utility model when disassembled.

[0036] Figure 6 This is a schematic diagram of the internal flow channel of the front housing in the drive system of this utility model.

[0037] Figure 7 This is a schematic diagram of the internal flow channel of the rear housing in the drive system of this utility model.

[0038] Explanation of reference numerals in the attached figures:

[0039] 100. First housing; 110. Front housing; 111. First section; 1111. First cooling tank; 1112. Long side wall; 1113. Short side wall; 112. Second section; 1121. Second cooling tank; 120. Rear housing; 121. Third section; 1211. Mounting slot; 122. Fourth section; 1221. Third cooling tank; 130. Control housing; 140. Motor housing; 151. First cooling chamber; 1511. 1512 First inlet channel; 1513 First liquid inlet; 1514 First liquid outlet; 152 Second cooling chamber; 1521 Second inlet channel; 1522 Second liquid inlet channel; 1523 Second liquid outlet; 1524 Second liquid inlet; 153 Third cooling chamber; 1531 Cooling channel; 1532 Third liquid inlet; 1533 Third liquid outlet; 161 Motor chamber; 162 Control chamber ; 171. Front cover plate; 172. Rear cover plate; 181. First guide structure; 1811. First guide rib; 1812. First diverter block; 1813. First protrusion; 1814. First partition block; 1815. Second guide rib; 1816. Third guide rib; 182. Second guide structure; 1821. Fourth guide rib; 1822. Fifth guide rib; 1823. Sixth guide rib; 1824. Second diverter block; 1825. Two protrusions; 1826, Seventh guide rib; 183, Third guide structure; 1831, Eighth guide rib; 1832, Ninth guide rib; 1833, Second partition block; 1834, Third diverter block; 200, Controller; 300, Motor body; 310, Motor shaft; 320, Stator; 330, Rotor; 400, Second housing; 410, Reducer housing; 420, Middle horizontal fork; 421, Heat dissipation fins; 500, Reducer body. Detailed Implementation

[0040] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0041] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0042] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0043] Please see Figures 1 to 3 As shown, the drive system corresponding to a preferred embodiment of the present invention includes: a first housing 100, in which a cooling structure is formed, the cooling structure being configured to allow circulation of a liquid cooling medium; a controller 200, disposed in the first housing 100 and thermally coupled to the cooling structure; a motor body 300, disposed in the first housing 100, electrically connected to the controller 200 and thermally coupled to the cooling structure; a second housing 400, detachably connected to the first housing 100; and a reducer body 500, disposed in the second housing 400 and drivenly connected to the motor body 300; wherein a thermally conductive interface is formed between the first housing 100 and the second housing 400, so that the heat of the reducer body 500 is transferred to the cooling structure through the second housing 400 and the thermally conductive interface.

[0044] This invention utilizes a cooling structure within the first housing 100 to circulate a liquid cooling medium. Simultaneously, the controller 200 and motor body 300 are thermally coupled to this cooling structure. The heat generated during operation of the controller 200 and motor body 300 can be carried away by the liquid cooling medium, achieving direct heat dissipation for the controller 200 and motor body 300. Compared to air-cooled structures, this provides superior heat dissipation. Furthermore, the controller 200 and motor body 300 are both housed in the first housing 100, while the reducer body 500 is housed in the second housing 400. The first and second housings 100 are detachably connected, facilitating disassembly and maintenance of the drive system. During production, the motor and reducer components can be manufactured and tested in parallel, shortening the production cycle. Additionally, the thermal coupling of the reducer body 500 and the cooling structure via a thermally conductive interface enables indirect heat dissipation for the reducer body 500. The reducer body 500 and / or the second housing 400 achieve optimal heat dissipation without requiring additional heat dissipation structures. This simple structure effectively reduces redundant cooling pipe layout, lowering system complexity and the risk of fluid leakage.

[0045] Furthermore, the first housing 100 includes a front housing 110 and a rear housing 120 joined together. The front housing 110 includes a first portion 111 and a second portion 112, and the rear housing 120 includes a third portion 121 and a fourth portion 122. The first portion 111 and / or the third portion 121 form a control housing 130 housing the controller 200, and the second portion 112 and the fourth portion 122 form a motor housing 140 housing the motor body 300. The cooling structure includes a first cooling cavity 151 located at the control housing 130 and a second cooling cavity 152 located at the motor housing 140, and the first cooling cavity 151 and the second cooling cavity 152 are connected. When the liquid cooling medium flows through the first cooling cavity 151 and the second cooling cavity 152, it can remove the heat dissipated by the controller 200 and the motor body 300, respectively. It should be noted that, in this embodiment, the rear housing 120 specifically refers to the housing that is away from the second housing 400, and the front housing 110 is located between the second housing 400 and the rear housing 120. The rear housing 120 and the second housing 400 are respectively spliced ​​to different end faces of the front housing 110.

[0046] Specifically, the second part 112 and the fourth part 122 are generally cylindrical in shape, with their opposite end faces recessed inward to form grooves, so that after splicing, they form a motor cavity 161 to accommodate the motor body 300. The second part 112 has a clearance hole to allow the motor shaft 310 of the motor body 300 to extend out of the motor cavity 161 and be driven by the reducer body 500. The first part 111 and the third part 121 are both plate-shaped. The first part 111 is connected to the periphery of the second part 112 and extends outward along the radial direction of the second part 112. The fourth part 122 is connected to the periphery of the third part 121 and extends outward along the radial direction of the third part 121. Preferably, the first part 111 and the second part 112 are integrally formed, and the third part 121 and the fourth part 122 are integrally formed, so as to improve strength and simplify the assembly steps.

[0047] Furthermore, in one embodiment, the first part 111 and the third part 121 cooperate to form a sealed control cavity 162, and the controller 200 is disposed in the control cavity 162. However, since the cooling structure is integrated in the first housing 100, the front housing 110 and / or the rear housing 120 have a large axial dimension in the motor housing 140, which makes it inconvenient to disassemble and assemble the controller 200.

[0048] Reference Figure 2 and Figure 4As shown, in a preferred embodiment, the control cavity 162 is integrated into the rear housing 120. A mounting groove 1211 is formed by a recess inwardly extending from the end facing away from the front housing 110. A rear cover plate 172 is provided on the rear housing 120. The rear cover plate 172 and the rear housing 120 can be fastened together with bolts. The rear cover plate 172 is adapted to cover the mounting groove 1211 to form the control cavity 162 accommodating the controller 200. With the above structure, the controller 200 can be disassembled and repaired without being obstructed by the front housing 110 and / or the second housing 400, making disassembly and repair very convenient.

[0049] Furthermore, referring to Figure 3 and Figure 5 As shown, the first part 111 is recessed inward from the end face away from the rear housing 120 to form a first cooling groove 1111, and the second part 112 is recessed inward from the end face away from the rear housing 120 to form a second cooling groove 1121. A front cover plate 171 is provided on the front housing 110. The front cover plate 171 and the front housing 110 can be fastened together by bolts. The front cover plate 171 is suitable for simultaneously covering the first cooling groove 1111 and the second cooling groove 1121. The first cooling groove 1111 and the front cover plate 171 cooperate to form a first cooling cavity 151, and the second cooling groove 1121 and the front cover plate 171 cooperate to form a second cooling cavity 152. Since the front housing 110 is adjacent to the second housing 400, by integrating the first cooling cavity 151 and the second cooling cavity 152 onto the front housing 110, it is easier for them to act on the second housing 400 to achieve heat dissipation of the reducer body 500. Preferably, the front cover 171 is disposed behind the front housing 110, and its end face is flush with the front cover 171, so that the second housing 400 can fully contact the front cover 171 and improve the heat conduction effect.

[0050] Furthermore, the mounting slot 1211 and the first cooling slot 1111 are arranged correspondingly, and the bottom of the mounting slot 1211 and the bottom of the first cooling slot 1111 are adjacent to each other, so that a heat-conducting interface is formed between the control cavity 162 and the first cooling cavity 151 to facilitate the heat dissipation of the control cavity 162.

[0051] Furthermore, in most cases, the stator 320 of the motor body 300 generates more heat than the rotor 330. Therefore, the second cooling chamber 152 mainly dissipates heat from the stator 320, and it is preferably arranged adjacent to the stator 320. In this embodiment, referring to... Figure 1As shown, the motor body 300 is a dual-stator, single-rotor axial flux motor. The air gap surface is perpendicular to the motor shaft 310 of the motor body 300, resulting in a short axial distance. When combined with the reducer body 500, it can occupy less wheel-side space, providing more usable and passenger space for the rear wheels of the vehicle. The motor body 300 includes two coaxially arranged stators 320 and a rotor 330 located between the two stators 320. The motor shaft 310 passes through the stators 320 and the rotor 330.

[0052] Preferably, the cooling structure further includes a third cooling cavity 153 located at the motor housing 140. The third cooling cavity 153 is connected to the second cooling cavity 152. The third cooling cavity 153 and the second cooling cavity 152 are respectively located on both sides of the motor body 300 in the axial direction, so as to dissipate heat from the two stators 320 of the motor body 300 respectively, resulting in better heat dissipation.

[0053] Specifically, refer to Figure 4 As shown, the fourth part 122 is recessed inward from the end facing away from the front housing 110 to form a third cooling groove 1221. The rear cover plate 172 is adapted to simultaneously cover the mounting groove 1211 and the third cooling groove 1221. The third cooling groove 1221 and the rear cover plate 172 cooperate to form a third cooling cavity 153, which is connected to the second cooling cavity 152. The liquid cooling medium is adapted to circulate among the first cooling cavity 151, the second cooling cavity 152, and the third cooling cavity 153.

[0054] Furthermore, referring to Figure 6 and Figure 7 As shown, the first cooling chamber 151 includes a first inlet channel 1511 and a first return channel 1512; the second cooling chamber 152 includes a second inlet channel 1521 and a second return channel 1522; and the third cooling chamber 153 includes a cooling channel 1531. The first inlet channel 1511, the second inlet channel 1521, the cooling channel 1531, the second return channel 1522, and the first return channel 1512 are connected in series at one end. The other end of the first inlet channel 1511 is provided with a first liquid inlet 1513, and the other end of the first return channel 1512 is provided with a first liquid outlet 1514, so that liquid cooling medium can flow from the outside into the first inlet channel 1511 and flow from the first return channel 1522 to the outside.

[0055] By adopting the above structure, the liquid cooling medium can flow orderly along a preset path under the guidance of the flow channel, resulting in more uniform heat dissipation. In this embodiment, the first cooling chamber 151, the second cooling chamber 152, and the third cooling chamber 153 are all provided with flow guiding structures to define the first inlet flow channel 1511, the first return flow channel 1512, the second inlet flow channel 1521, the second return flow channel 1522, and the cooling flow channel 1531, respectively.

[0056] Furthermore, the flow guiding structure includes a first flow guiding structure 181 disposed in the first cooling cavity 151. The first flow guiding structure 181 protrudes from the bottom of the first cooling groove 1111 and extends upward to the opening of the first cooling groove 1111. The top of the first flow guiding structure 181 abuts against the front cover plate 171, thereby defining the first inlet flow channel 1511 and the first return flow channel 1512. The first flow guiding structure 181 is preferably integrally formed with the front housing 110 to simplify the assembly process.

[0057] In this embodiment, the first cooling groove 1111 is a square groove adapted to the outer contour of the first part 111, so that its cooling range covers the first part 111 to the greatest extent. It should be noted that the length direction of the first cooling groove 1111 is the extension direction of the first part 111, and the width direction is the direction perpendicular to the length direction. The first flow guiding structure 181 includes first flow guiding ribs 1811, and multiple first flow guiding ribs 1811 are arranged at intervals along the width direction of the first cooling groove 1111. A channel for the flow of liquid cooling medium is formed between two adjacent first flow guiding ribs 1811 and / or between the first flow guiding ribs 1811 and the sidewall of the first cooling groove 1111.

[0058] Because the first cooling tank 1111 has a relatively large length, the first guide rib 1811 is preferably a linear strip structure, with its length direction parallel to the length direction of the first cooling tank 1111, to facilitate processing and forming. Several first guide ribs 1811 define a first inlet channel 1511, the cooling range of which covers the entire control cavity 162. The first cooling tank 1111 includes a long side wall 1112 parallel to the extension direction of the first portion 111 and a short side wall 1113 perpendicular to the extension direction. A channel is formed between the long side wall 1112 and the first guide rib 1811, and an opening is formed between the short side wall 1113 and the first guide rib 1811 to connect the beginning and end of two adjacent channels, resulting in a continuous S-shaped layout for the first inlet channel 1511 to improve heat dissipation.

[0059] Preferably, a first diverter block 1812 is provided within the first inlet channel 1511. Multiple first diverter blocks 1812 are arranged side-by-side at intervals along the flow direction of the liquid cooling medium. When the liquid cooling medium flows into the first inlet channel 1511, the first diverter block 1812 can divert the liquid cooling medium, ensuring that even with a wide channel, the liquid cooling medium can flow evenly to all positions within the channel. Furthermore, the long sidewall 1112 and / or short sidewall 1113 of the first cooling tank 1111 are provided with arc-shaped first protrusions 1813. These first protrusions 1813 cooperate with the first diverter blocks 1812 to guide the liquid cooling medium, further improving the uniformity of the flow process. In this embodiment, multiple first protrusions 1813 on the long sidewall 1112 are arranged at intervals along the length of the first cooling tank 1111, and multiple first protrusions 1813 on the short sidewall 1113 are arranged at intervals along the width of the first cooling tank 1111.

[0060] Furthermore, a first partition block 1814 is connected between one of the long sidewalls 1112 and the adjacent first guide rib 1811. The side of the first partition block 1814 facing away from the second part 112 serves as the inlet end of the first inlet channel 1511. The first part 111 has a first liquid inlet 1513 at the inlet end of the first inlet channel 1511 so that external liquid cooling medium flows into the first inlet channel 1511.

[0061] Furthermore, a first reflux channel 1512 is formed between the long sidewall 1112 with a first liquid inlet 1513 and the adjacent first guide rib 1811. The side of the first partition block 1814 facing the second part 112 serves as the outlet end of the first reflux channel 1512. The first part 111 has a first liquid outlet 1514 at the outlet end of the first reflux channel 1512 to allow the liquid cooling medium to flow to the outside. In this embodiment, both the first liquid inlet 1513 and the first liquid outlet 1514 are located on the long sidewall 1112, facilitating subsequent connection to an external circulation system.

[0062] In one embodiment, a partition is provided between the first cooling tank 1111 and the second cooling tank 1121. The outlet end of the first inlet channel 1511 is located at the partition, and the inlet end of the first return channel 1512 is located at the partition. The partition is provided with an opening to connect the first inlet channel 1511 and the second inlet channel 1521, as well as to connect the first return channel 1512 and the second return channel 1522.

[0063] However, with the above structure, the front housing 110 is relatively inconvenient to process and form. As a preferred embodiment, there is preferably no partition between the first cooling tank 1111 and the second cooling tank 1121, that is, the adjacent side of the first cooling tank 1111 and the second cooling tank 1121 is an open structure and they are connected to each other to facilitate processing and forming and docking of the various flow channels. At this time, the first flow guiding structure 181 also includes a second flow guiding rib 1815 and a third flow guiding rib 1816. The second flow guiding rib 1815 is connected to the outlet end of the first inlet flow channel 1511 and extends to dock to the inlet end of the second inlet flow channel 1521. There are two second guide ribs 1815. One second guide rib 1815 is connected to the long side wall 1112 away from the first liquid inlet 1513, and the other second guide rib 1815 is connected to the first guide rib 1811 adjacent to the long side wall 1112. A transition section is defined between the two second guide ribs 1815 to guide the liquid cooling medium from the first inlet channel 1511 into the second inlet channel 1521. The second guide ribs 1815 are preferably arc-shaped ribs to allow the liquid cooling medium to flow more smoothly into the second inlet channel 1521. Because the transition section path is short, the second guide ribs 1815 are easier to manufacture.

[0064] The third guide rib 1816 is connected to the inlet end of the first return channel 1512 and extends to the outlet end of the second return channel 1522. Specifically, there are two third guide ribs 1816. One third guide rib 1816 is connected to the long side wall 1112 with the first liquid outlet 1514, and the other third guide rib 1816 is connected to the first guide rib 1811 adjacent to the long side wall 1112. A transition section is defined between the two third guide ribs 1816 to guide the liquid cooling medium from the second return channel 1522 into the first return channel 1511. The structure of the third guide rib 1816 is similar to that of the second guide rib 1815, and will not be described in detail here. The two transition sections are axially symmetrical, and the axis of symmetry is parallel to the extension direction of the first part 111.

[0065] Since there is no partition between the first cooling tank 1111 and the second cooling tank 1121, in this embodiment, the second guide rib 1815 and the third guide rib 1816 connected to the first guide rib 1811 located on the side are adapted to connect with other first guide ribs 1811 to block the liquid cooling medium, ensuring that the liquid cooling medium can only flow into the second inlet channel 1521 from the outlet end of the first inlet channel 1511, and the liquid cooling medium flowing out from the second return channel 1522 can only flow into the first return channel 1512.

[0066] Furthermore, the flow guiding structure includes a second flow guiding structure 182 disposed in the second cooling chamber 152. The second flow guiding structure 182 protrudes from the bottom of the second cooling tank 1121 and extends upward to the opening of the second cooling tank 1121. The top of the second flow guiding structure 182 abuts against the front cover plate 171, thereby defining the second inlet flow channel 1521 and the second return flow channel 1522. The second flow guiding structure 182 is preferably integrally formed with the bottom of the second cooling tank 1121 to simplify the assembly process.

[0067] In this embodiment, the second cooling groove 1121 is a circular groove adapted to the outer contour of the second part 112, so that its cooling range covers the second part 112 to the greatest extent. The second flow guiding structure 182 includes a fourth flow guiding rib 1821 and a fifth flow guiding rib 1822. The fourth flow guiding rib 1821 is a linear strip structure, and its length direction is parallel to the extension direction of the first part 111. The two ends of the fourth flow guiding rib 1821 extend to the two sides of the second cooling groove 1121, so as to divide the second cooling groove 1121 into two cavities. The fifth flow guiding rib 1822 is located on the side of the second cooling groove 1121, and there are two of them, which are respectively provided in different cavities. One end of the fifth flow guiding rib 1822 is adjacent to one end of the fourth flow guiding rib 1821, and the other end is adjacent to the other end of the fourth flow guiding rib 1821. One fifth guide rib 1822 and the fourth guide rib 1821 cooperate to form the second inlet flow channel 1521, and the other fifth guide rib 1822 and the fourth guide rib 1821 cooperate to form the second return flow channel 1522. In this embodiment, both the second inlet flow channel 1521 and the second return flow channel 1522 are arranged in a continuous S-shape, so that the liquid cooling medium flows more evenly to all positions of the second cooling chamber 152.

[0068] Furthermore, the second guide rib 1815 and the third guide rib 1816 connected to the first guide rib 1811 are respectively connected to the end of the fourth guide rib 1821 near the first cooling tank 1111, and the second guide rib 1815 and the third guide rib 1816 connected to the long side wall 1112 are respectively connected to the end of the fifth guide rib 1822 near the first cooling tank 1111, so as to realize the docking of the first inlet channel 1511 and the second inlet channel 1521, as well as the docking of the first return channel 1512 and the second return channel 1522.

[0069] Furthermore, since the second part 112 is used to accommodate the motor body 300, it needs to avoid the motor shaft 310 of the motor body 300. In this embodiment, the fourth guide rib 1821 has a discontinuous structure at the center of the second cooling tank 1121. The second guide structure 182 includes a sixth guide rib 1823 located at the center of the second cooling tank 1121. The sixth guide rib 1823 has a ring-shaped structure to avoid the motor shaft 310. The fourth guide rib 1821 is connected to the periphery of the sixth guide rib 1823. The sixth guide rib 1823 is preferably annular to reduce the generation of dead angles.

[0070] Preferably, the bottom of the second cooling tank 1121 may be provided with a plurality of second diverter blocks 1824, and the inner wall of the fifth guide rib 1822, which is used to guide the liquid cooling medium, is provided with a plurality of arc-shaped second protrusions 1825 to guide the liquid cooling medium and make it flow more evenly to various positions of the flow channel. Specifically, refer to the aforementioned first diverter block 1812 and first protrusion 1813. In addition, a plurality of seventh guide ribs 1826 may be provided on the periphery of the sixth guide rib 1823. The seventh guide ribs 1826 have a linear strip structure and extend toward the fifth guide rib 1822, so that more S-shapes are formed in the flow channel. The extended ends of the seventh guide ribs 1826 may also be provided with second protrusions 1825. The second inlet flow channel 1521 and the second return flow channel 1522 are preferably arranged axially symmetrically, and the axis of symmetry is parallel to the extension direction of the first part 111. In this embodiment, its axis of symmetry coincides with the axis of symmetry of the two transition sections.

[0071] Furthermore, the bottom of the second cooling tank 1121 is provided with a second liquid outlet 1523 and a second liquid inlet 1524. The second liquid outlet 1523 is located between the fourth guide rib 1821 and the end of one of the fifth guide ribs 1822 away from the first part 111, and the second liquid inlet 1524 is located between the fourth guide rib 1821 and the end of the other fifth guide rib 1822 away from the first part 111. The liquid cooling medium in the second inlet channel 1521 is adapted to flow into the cooling channel 1531 through the second liquid outlet 1523, and the liquid cooling medium in the cooling channel 1531 is adapted to flow into the second return channel 1522 through the second liquid inlet 1524.

[0072] Furthermore, the flow guiding structure includes a third flow guiding structure 183 disposed in the third cooling chamber 153. The third flow guiding structure 183 protrudes from the bottom of the third cooling tank 1221 and extends upward to the opening of the third cooling tank 1221. The top of the third flow guiding structure 183 abuts against the rear cover plate 172, thereby defining the cooling flow channel 1531. Preferably, the third flow guiding structure 183 is integrally formed with the bottom of the third cooling tank 1221 to simplify the assembly process.

[0073] In this embodiment, the third cooling tank 1221 is a circular tank adapted to the outer contour of the fourth part 122, so that its cooling range covers the fourth part 122 to the greatest extent. The third flow guiding structure 183 includes an eighth flow guiding rib 1831, a ninth flow guiding rib 1832, and a second partition block 1833. The eighth flow guiding rib 1831 is disposed in the middle of the third cooling tank 1221, and the ninth flow guiding rib 1832 is located on the side of the third cooling tank 1221, and multiple ribs are evenly distributed along its circumference. A cooling channel 1531 is formed between the eighth flow guiding rib 1831 and the ninth flow guiding rib 1832. The second partition block 1833 is connected between the eighth flow guiding rib 1831 and the side wall of the third cooling tank 1221. One side of the second partition block 1833 is the inlet end of the cooling channel 1531, and the other side is the outlet end of the cooling channel 1531. The cooling channel 1531 also has a continuous S-shaped layout, which allows the liquid cooling medium to flow more evenly to various positions of the third cooling chamber 153. Several third distribution blocks 1834 are provided in the cooling channel 1531 to ensure that the liquid cooling medium is evenly distributed.

[0074] Furthermore, the bottom of the third cooling tank 1221 is provided with a third liquid inlet 1532 and a third liquid outlet 1533. The third liquid inlet 1532 is located at the inlet end of the cooling channel 1531, and the third liquid outlet 1533 is located at the outlet end of the cooling channel 1531. The third liquid inlet 1532 corresponds to the second liquid outlet 1523, and the third liquid outlet 1533 corresponds to the second liquid inlet 1524. The second part 112 and the fourth part 122 cooperate to form a liquid inlet channel (not shown) and a liquid outlet channel (not shown). The liquid inlet channel connects the second liquid outlet 1523 and the third liquid inlet 1532, and the liquid outlet channel connects the second liquid inlet 1524 and the third liquid outlet 1533. The liquid cooling medium in the second inlet channel 1521 can flow into the cooling channel 1531 through the second outlet 1523, the inlet channel and the third inlet 1532. The liquid cooling medium in the cooling channel 1531 can flow into the second return channel 1522 through the third outlet 1533, the outlet channel and the second inlet 1524.

[0075] During cooling, the liquid cooling medium enters the first housing 100 through the first inlet 1513 and flows sequentially through the first inlet channel 1511, the second inlet channel 1521, the cooling channel 1531, the second return channel 1522, and the first return channel 1512 before exiting through the first outlet 1514, thereby cooling and dissipating heat for the controller 200 and the motor body 300.

[0076] Furthermore, referring to Figures 1 to 3As shown, the second housing 400 is disposed on the end face of the front housing 110 opposite to the rear housing 120. It includes a reducer housing 410 corresponding to the second part 112 and a center fork 420 corresponding to the first part 111. The reducer housing 410 is used to house the reducer body 500, and the center fork 420 is integrated into the reducer housing 410. The integrated center fork 420 is lightweight, resulting in a smaller side weight distribution on the electric two-wheeler, making the left and right weight distribution of the side-mounted two-wheeled electric vehicle more balanced and the overall vehicle operation more stable.

[0077] The reducer housing 410 and / or the center fork 420 are in contact with the front cover plate 171. In this embodiment, both the reducer housing 410 and the center fork 420 are in contact with the front cover plate 171. The reducer housing 410 is attached to the area of ​​the front cover plate 171 corresponding to the second part 112, and the center fork 420 is attached to the area of ​​the front cover plate 171 corresponding to the first part 111, thereby improving heat dissipation. The front cover plate 171 can be made of a metal with high thermal conductivity, and the contact surface is filled with a thermally conductive structure, such as thermally conductive silicone, to more efficiently remove heat from the reducer body 500. Preferably, the center fork 420 can also be provided with heat dissipation fins 421 to cooperate with the cooling structure to cool the reducer body 500.

[0078] Furthermore, the motor shaft 310 of the motor body 300 and the input shaft of the reducer body 500 are integrally formed to simplify the overall structure and further reduce the axial thickness of the integrated motor body 300 and reducer body 500. Preferably, the ratio of the axial thickness of the motor body 300 and the reducer body 500 is close to 1:1, specifically 0.8:1 to 1.2:1. With the above-mentioned proportion, the overall mass distribution of the drive system is more balanced after installation on the electric two-wheeler, resulting in smoother vehicle operation.

[0079] In addition, this utility model also provides an electric two-wheeled vehicle, including the aforementioned drive system.

[0080] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A drive system, characterized in that, include: A first housing (100) has a cooling structure formed therein, the cooling structure being configured to allow the circulation of a liquid cooling medium; A controller (200) is disposed in the first housing (100) and thermally coupled to the cooling structure; The motor body (300) is disposed in the first housing (100), and is electrically connected to the controller (200) and thermally coupled to the cooling structure; The second housing (400) is detachably connected to the first housing (100); The reducer body (500) is disposed in the second housing (400) and is connected to the motor body (300) in a transmission manner; A heat-conducting interface is formed between the first housing (100) and the second housing (400), so that the heat of the reducer body (500) is transferred to the cooling structure through the second housing (400) and the heat-conducting interface.

2. The drive system as described in claim 1, characterized in that, The first housing (100) includes: The front housing (110) includes a first part (111) and a second part (112); The rear housing (120) includes a third part (121) and a fourth part (122), the front housing (110) and the rear housing (120) are adapted to be spliced ​​together so that the first part (111) and / or the third part (121) form a control housing (130) for housing the controller (200), and the second part (112) and the fourth part (122) form a motor housing (140) for housing the motor body (300); The cooling structure includes a first cooling chamber (151) located in the control housing (130) and a second cooling chamber (152) located in the motor housing (140), and the first cooling chamber (151) and the second cooling chamber (152) are connected.

3. The drive system as described in claim 2, characterized in that, The motor body (300) is an axial flux motor with dual stators and a single rotor. The cooling structure also includes a third cooling cavity (153) located in the motor housing (140). The third cooling cavity (153) is connected to the second cooling cavity (152). The third cooling cavity (153) and the second cooling cavity (152) are respectively located on both sides of the motor body (300) in the axial direction.

4. The drive system as described in claim 3, characterized in that, The first cooling chamber (151) includes a first inlet channel (1511) and a first return channel (1512), the second cooling chamber (152) includes a second inlet channel (1521) and a second return channel (1522), and the third cooling chamber (153) includes a cooling channel (1531). The first inlet channel (1511), the second inlet channel (1521), the cooling channel (1531), the second return channel (1522) and the first return channel (1512) are connected in series at one end. The other end of the first inlet channel (1511) is provided with a first liquid inlet (1513), and the other end of the first return channel (1512) is provided with a first liquid outlet (1514).

5. The drive system as described in claim 4, characterized in that, The first cooling chamber (151), the second cooling chamber (152) and the third cooling chamber (153) are all provided with flow guiding structures to define the first inlet flow channel (1511), the first return flow channel (1512), the second inlet flow channel (1521), the second return flow channel (1522) and the cooling flow channel (1531) respectively.

6. The drive system as described in claim 2, characterized in that, The first part (111) is recessed inward from the end face away from the rear housing (120) to form a first cooling groove (1111). A front cover plate (171) is provided on the front housing (110). The front cover plate (171) is adapted to cover the first cooling groove (1111). The first cooling groove (1111) and the front cover plate (171) cooperate to form the first cooling cavity (151). The third part (121) is recessed inward from the end face away from the front housing (110) to form a mounting groove (1211). A rear cover plate (172) is provided on the rear housing (120). The rear cover plate (172) is adapted to cover the mounting groove (1211) to form a control cavity (162) for accommodating the controller (200). A heat-conducting interface is formed between the control cavity (162) and the first cooling cavity (151).

7. The drive system as described in claim 2, characterized in that, The second part (112) is recessed inward from the end face away from the rear housing (120) to form a second cooling groove (1121). A front cover plate (171) is provided on the front housing (110). The front cover plate (171) is adapted to cover the second cooling groove (1121). The second cooling groove (1121) and the front cover plate (171) cooperate to form the second cooling cavity (152). The fourth part (122) is recessed inward from the end face away from the front housing (110) to form a third cooling groove (1221). A rear cover plate (172) is provided on the rear housing (120). The rear cover plate (172) is adapted to cover the third cooling groove (1221). The third cooling groove (1221) and the rear cover plate (172) cooperate to form a third cooling cavity (153). The third cooling cavity (153) is connected to the second cooling cavity (152).

8. The drive system as described in claim 6 or 7, characterized in that, The second housing (400) is disposed on the end face of the front housing (110) opposite to the rear housing (120), and includes: A reducer housing (410) is used to house the reducer body (500); The center horizontal fork (420) is integrated into the reducer housing (410); The reducer housing (410) and / or the center horizontal fork (420) are in contact with the front cover plate (171).

9. The drive system as described in claim 1, characterized in that, The motor shaft (310) of the motor body (300) and the input shaft of the reducer body (500) are integrally formed, and the ratio of the axial thickness of the motor body (300) to the reducer body (500) is 0.8:1 to 1.2:

1.

10. An electric two-wheeled vehicle, characterized in that, Includes the drive system as described in any one of claims 1 to 9.

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