A liquid-cooled mid-mounted motor with the same cavity

Abstract

The present invention discloses a same-cavity liquid-cooled mid-mounted motor, including a casing, a middle shaft, a stator assembly, etc. The middle shaft passes through the casing and extends out of the casing, the stator assembly is sleeved inside the rotor assembly and connected to the casing, the clutch is respectively connected to the middle shaft and the gear speed change mechanism, the control system is connected to the stator assembly, and also includes insulating coolant, gears, etc. The middle partition divides the inside of the casing into a first cavity and a second cavity, the middle shaft passes through the middle partition, the gear speed change mechanism passes through the middle partition and is connected to the rotor assembly, the stator assembly, the control system and other components are arranged in the first cavity, and the gear speed change mechanism and other components are arranged in the second cavity. The present invention arranges the control system in the first cavity, which is closer to the core components of the motor in space, and can achieve more accurate control and monitoring. After arranging the control system and the stator assembly together, the insulating coolant is used to centrally dissipate heat, which is also conducive to improving the heat dissipation efficiency.

Description

Technical Field

[0001] The invention relates to a mid-mounted motor, in particular to a same-cavity liquid-cooled mid-mounted motor. Background Art

[0002] In the field of electric power-assisted bicycles, a mid-mounted motor refers to an electric power-assisted bicycle whose driving motor is installed in the middle of the vehicle body, i.e., at the pedal position. The motor is connected to the vehicle body and is connected to the rear wheel through a chain to transmit power. At the same time, pedals are installed on both sides of the motor. Riders can use the pedals to ride the bicycle manually, or they can choose to ride the bicycle with the motor and human power. Under the same power consumption, the mid-mounted motor can obtain greater torque than the rear hub motor, thereby improving the efficiency of battery use. The mid-mounted motors currently on the market all separate the motor assembly from the control system and the central control module, which are unstable in operation and make it difficult to achieve real-time and precise control of the motor by the control system. In addition, most cooling methods use air cooling, which has low heat dissipation efficiency, resulting in poor motor performance and affecting service life, so improvements need to be made. Summary of the invention

[0003] The present invention provides a new same-cavity liquid-cooled mid-mounted motor to address the defects in the prior art, such as the separation of the motor assembly from the control system and the central control module, unstable operation, difficulty in achieving real-time and precise control of the motor by the control system, and low heat dissipation efficiency.

[0004] In order to solve the above technical problems, the present invention is implemented by the following technical solutions:

[0005] A same-cavity liquid-cooled mid-mounted motor comprises a casing, a central shaft, a stator assembly, a rotor assembly, a gear speed change mechanism, a clutch, and a control system. The central shaft passes through the casing and extends out of the casing. The stator assembly is sleeved inside the rotor assembly and connected to the casing. The clutch is respectively connected to the central shaft and the gear speed change mechanism. The control system is connected to the stator assembly. The motor also comprises an insulating coolant, a gear lubricant, and a middle partition. The middle partition is arranged in the casing. The middle partition divides the interior of the casing into a first cavity and a second cavity. The central shaft passes through the middle partition. The gear speed change mechanism passes through the middle partition and is connected to the rotor assembly. The stator assembly, the rotor assembly, the insulating coolant, and the control system are arranged in the first cavity. The gear speed change mechanism, the clutch, and the gear lubricant are arranged in the second cavity.

[0006] The housing provides support, positioning and protection for the stator assembly, rotor assembly and other components, so that they can be installed and positioned reliably and protected from external force damage. When the stator assembly is energized, it can generate driving torque through the law of electromagnetic induction, so that the rotor assembly rotates relative to the stator assembly. The gear speed change mechanism is connected to the rotor assembly, and the rotor assembly drives the gear speed change mechanism and reduces the power output of the rotor assembly. The clutch is connected to the middle shaft and the gear speed change mechanism respectively. The clutch can be driven by the middle shaft and the gear speed change mechanism to rotate and finally output its power.

[0007] The present invention is provided with a first cavity and a second cavity. By installing the stator assembly, the rotor assembly, the insulating coolant, and the control system in the first cavity, and installing the gear speed change mechanism, the clutch, and the gear lubricant in the second cavity, it is not easy for them to affect each other, thereby improving the stability and reliability of the present invention. The insulating coolant located in the first cavity is in a flowing state, and flows inside the casing as the rotor assembly rotates, and fully contacts with each heat-generating component to exchange heat, which greatly improves the heat dissipation efficiency. The gear lubricant located in the second cavity cools the gear speed change mechanism while lubricating it, effectively controlling the mechanical friction heat generated by the gear meshing, reducing the wear on the gear tooth surface, and extending the service life of the gear. The control system is arranged in the first cavity, which is closer to the core components of the motor in space, and more accurate control and monitoring can be achieved. This structure allows the control system to be located inside the motor, making the line layout of the whole vehicle simpler and the structure more compact. After the two heat-generating components, the control system and the stator assembly, are arranged together, the insulating coolant is used to dissipate heat in a centralized manner, which is also conducive to improving the heat dissipation efficiency.

[0008] Preferably, the above-mentioned same-cavity liquid-cooled mid-mounted motor further includes a central control module, which is arranged in the second cavity and connected to the control system.

[0009] The central control module is arranged in the second cavity, so that the overall structure of the present invention is more compact and the functions are more diversified. The central control module and the gear speed change mechanism are arranged together and then the gear lubricating oil is used to centrally dissipate heat, which is also conducive to improving the heat dissipation efficiency.

[0010] Preferably, the above-mentioned same-cavity liquid-cooled mid-mounted motor further includes a wiring plug-in, which is arranged on the middle partition and passes through the middle partition, and the central control module and the control system are connected via the wiring plug-in.

[0011] The wiring plug-in installed on the middle partition is used to connect the central control module and control system located in different cavities, which is convenient for installation.

[0012] Preferably, in the above-mentioned same-cavity liquid-cooled mid-mounted motor, the middle partition is provided with a penetrating plug-in hole, and the wiring plug-in passes through the middle partition through the plug-in hole.

[0013] The plug-in hole is set through the middle partition plate for installing the wiring plug-in, which can simplify the installation steps.

[0014] Preferably, in the above-mentioned same-cavity liquid-cooled mid-mounted motor, the rotor assembly includes a rotor bracket and magnetic steel sheets that are connected to each other, the rotor bracket is connected to the gear speed change mechanism and is mounted outside the stator assembly, the rotor bracket rotates around the stator assembly with the central axis as the axis, and the magnetic steel sheet is located between the rotor bracket and the stator assembly.

[0015] After the stator assembly is energized, the magnetic field force can drive the magnetic steel sheet to drive the rotor bracket to rotate around it.

[0016] Preferably, the above-mentioned same-cavity liquid-cooled mid-mounted motor further includes a magnetic signal sensor, which is arranged on the casing and corresponds to the magnetic steel sheet, and the magnetic signal sensor is connected to the control system.

[0017] The Hall element is preferably used as a magnetic signal sensor, which accurately transmits the position information of the rotor assembly to the control system by sensing the magnetic field at the end of the magnetic steel sheet. At the same time, it avoids the mechanical damage of the Hall element caused by installing the Hall element on the stator assembly of the traditional motor.

[0018] Preferably, in the above-mentioned same-cavity liquid-cooled mid-mounted motor, the casing is provided with a sensor bracket at a position corresponding to the magnetic signal sensor, and the sensor bracket is adapted to and fixes the magnetic signal sensor.

[0019] The sensor bracket is used to fix the magnetic signal sensor and improve the installation speed of the magnetic signal sensor during the installation process.

[0020] Preferably, in the above-mentioned same-cavity liquid-cooled mid-mounted motor, the middle partition is provided with a concave guide groove at a position corresponding to the rotor assembly, and the cross-section of the guide groove is U-shaped.

[0021] The concave U-shaped structure of the guide groove can accommodate part of the insulating coolant. During the rotation of the rotor assembly, the insulating coolant inside can flow along the guide groove to the control system. After the insulating coolant contacts the control system, it flows back to the guide groove under the stirring of the rotor assembly, realizing the circulation of the insulating coolant.

[0022] Preferably, in the above-mentioned same-cavity liquid-cooled mid-mounted motor, the rotor bracket is provided with a through slot.

[0023] The insulating coolant on one side of the guide groove can flow into the interior of the stator assembly through the notch on the rotor bracket, thereby improving the heat dissipation efficiency and achieving rapid cooling.

[0024] Preferably, in the above-mentioned same-cavity liquid-cooled mid-mounted motor, the slots are arranged on the edge of the side wall of the rotor bracket, and the number of the slots is more than 2.

[0025] Providing more than two notches can improve the heat dissipation efficiency and increase the contact area between the stator assembly and the insulating coolant.

[0026] Preferably, in the above-mentioned same-cavity liquid-cooled mid-mounted motor, the rotor bracket is provided with an oil stirring blade at a position corresponding to the notch, and the oil stirring blade is a sheet-like protrusion.

[0027] The oil stirring blades can enhance the stirring effect of the rotor bracket on the insulating coolant, increase the circulation flow speed of the insulating coolant, and improve the heat dissipation efficiency.

[0028] Preferably, in the above-mentioned same-cavity liquid-cooled mid-mounted motor, the control system and the rotor assembly are arranged horizontally inside the first cavity, and the setting height of the control system is lower than the setting height of the rotor assembly.

[0029] The control system is arranged at a position slightly below the side of the rotor assembly, and in coordination with the rotation direction of the rotor assembly, the insulating coolant flowing out of the guide groove can flow into the control system from above the control system to cool it.

[0030] Preferably, in the above-mentioned same-cavity liquid-cooled mid-mounted motor, the casing comprises a side cover and a casing body, the side cover is detachably connected to the casing body, and the middle partition is arranged on the casing body.

[0031] The side cover and the shell body are connected in a detachable manner, making the entire installation process more convenient and more conducive to later maintenance and replacement.

[0032] Preferably, the above-mentioned same-cavity liquid-cooled mid-mounted motor further includes a sealing gasket, which is located between the side cover and the shell body, and the sealing gasket is adapted to the side cover and the shell body.

[0033] A sealing gasket is arranged between the side cover and the shell body to ensure the sealing performance of the motor.

[0034] Preferably, in the above-mentioned same-cavity liquid-cooled mid-mounted motor, the side cover is provided with a sealing gasket groove at a position corresponding to the sealing gasket, and the sealing gasket groove is adapted to the sealing gasket.

[0035] The sealing gasket can be embedded in the sealing gasket groove, which can not only ensure that the sealing gasket does not fall off, but also further enable the sealing gasket to be accurately positioned during the installation process.

[0036] Preferably, in the above-mentioned same-cavity liquid-cooled mid-mounted motor, the casing is provided with a wire clamping groove, and the wire clamping groove is located on the outside of the side cover corresponding to the second cavity.

[0037] The wire trough can constrain and position the wiring harness led out of the central control module in the second cavity, thereby improving the neatness of the overall appearance of the motor.

[0038] Preferably, the above-mentioned same-cavity liquid-cooled mid-mounted motor also includes a first oil-proof breathable valve, the first oil-proof breathable valve has an oil-proof breathable membrane built in, a first through air hole is provided on the first cavity, the first oil-proof breathable valve is adapted to the first air hole and seals the first air hole.

[0039] The design of the first oil-proof breathable valve can ensure the balance of internal and external air pressure of the first cavity when the motor is working, reduce the internal and external pressure difference of the motor caused by the increase or decrease of the internal temperature of the motor, protect the motor, and extend the service life of the motor.

[0040] Preferably, the above-mentioned same-cavity liquid-cooled mid-mounted motor also includes a second oil-proof breathable valve, the second oil-proof breathable valve has an oil-proof breathable membrane built in, the second cavity is provided with a second through air hole, the second oil-proof breathable valve is adapted to the second air hole and seals the second air hole.

[0041] The design of the second oil-proof breathable valve can ensure the balance of internal and external air pressure of the second cavity when the motor is working, reduce the internal and external pressure difference of the motor caused by the increase or decrease of the internal temperature of the motor, protect the motor, and extend the service life of the motor.

[0042] Preferably, in the above-mentioned same-cavity liquid-cooled mid-mounted motor, the central axis passes through the stator assembly, the rotor assembly, the gear speed change mechanism, and the clutch.

[0043] The axis of the stator assembly, rotor assembly, gear speed change mechanism, middle shaft and clutch are overlapped, the whole transmission process is simple, the mechanical loss in the power output transmission process is small, and it is not easy to cause wear. The noise is small when the motor is running, which is conducive to extending the service life of the motor.

[0044] Preferably, the above-mentioned same-cavity liquid-cooled mid-mounted motor further includes a pedal crank, and the pedal crank is connected to the portion of the central axis extending outside the casing.

[0045] The pedal crank connected to the middle shaft can drive the middle shaft to rotate under the action of human power, and then drive the clutch module through the middle shaft to realize human power output.

[0046] Preferably, the above-mentioned same-cavity liquid-cooled mid-mounted motor further includes a sprocket bracket, and the sprocket bracket is connected to the clutch.

[0047] When in use, the sprocket bracket can be connected to an external sprocket. Under the drive of the clutch module, the sprocket bracket drives the external sprocket to rotate together to achieve power output of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 is a schematic structural diagram of the components located in the first cavity in the present invention;

[0049] Figure 2 It is a schematic structural diagram of the wire clamping slot and the components located in the second cavity in the present invention;

[0050] Figure 3 is a cross-sectional view of the present invention;

[0051] Figure 4 An exploded view of the present invention;

[0052] Figure 5 is a schematic diagram of the interior of the first cavity of the present invention;

[0053] Figure 6 is a schematic diagram of the interior of the second cavity of the present invention;

[0054] Figure 7 It is a schematic diagram of the structure when the rotor assembly, the central shaft and the stator assembly are combined together in the present invention;

[0055] Figure 8 This is a schematic diagram of the installation of the present invention after being installed on a vehicle frame;

[0056] Fig. 9 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0057] The following is combined with Figure 1-9 The present invention is further described in detail with specific embodiments, but they are not intended to limit the present invention:

[0058] Example 1

[0059] A same-cavity liquid-cooled mid-mounted motor, comprising a housing 1, a middle shaft 4, a stator assembly 3, a rotor assembly 2, a gear speed change mechanism 6, a clutch 7, and a control system 5, wherein the middle shaft 4 passes through the housing 1 and extends out of the housing 1, the stator assembly 3 is sleeved inside the rotor assembly 2 and connected to the housing 1, the clutch 7 is respectively connected to the middle shaft 4 and the gear speed change mechanism 6, the control system 5 is connected to the stator assembly 3, and further comprises an insulating coolant 111, a gear lubricating oil 121, and a middle partition 13 ... The middle partition 13 is arranged in the casing 1, and the middle partition 13 divides the interior of the casing 1 into a first cavity 11 and a second cavity 12. The central axis 4 passes through the middle partition 13, and the gear speed change mechanism 6 passes through the middle partition 13 to be connected with the rotor assembly 2. The stator assembly 3, the rotor assembly 2, the insulating coolant 111, and the control system 5 are arranged in the first cavity 11, and the gear speed change mechanism 6, the clutch 7, and the gear lubricating oil 121 are arranged in the second cavity 12.

[0060] When the motor needs to be started, a start signal is sent through the control system 5, and the stator assembly 3 is energized. At this time, a Lorentz force is generated between the rotor assembly 2 and the stator assembly 3, and the rotor assembly 2 rotates around the stator assembly 3. The gear transmission mechanism 6 rotates under the drive of the rotor assembly 2, and the rotating gear transmission mechanism 6 drives the clutch 7 to rotate, and finally the clutch 7 outputs the power of the motor through an external power output component.

[0061] During this process, the insulating coolant 111 in the first cavity 11 flows under the stirring of the rotor assembly 2, fully contacts and exchanges heat with heat-generating components such as the control system 5 and the stator assembly 3, and then transfers the heat to the casing 1, and then dissipates it into the external air.

[0062] When the temperature is too high or the speed is too fast, the control system 5 issues a command to reduce the speed, thereby reducing the speed of the rotor assembly 2. When the motor needs to be stopped, a stop signal is sent through the control system 5, and the motor gradually stops working.

[0063] When human power is used, the external power component of the middle shaft 4 drives the middle shaft 4 to rotate, and the middle shaft 4 drives the clutch 7 to work. Finally, the clutch 7 outputs the human power through the external power output component.

[0064] Preferably, it further includes a central control module 8 , which is disposed in the second cavity 12 and connected to the control system 5 .

[0065] Preferably, it further includes a wiring plug-in 133 , which is disposed on the middle partition 13 and penetrates the middle partition 13 , and the central control module 8 and the control system 5 are connected via the wiring plug-in 133 .

[0066] Preferably, a through plug-in hole 131 is provided on the middle partition plate 13 , and the wiring plug-in 133 passes through the middle partition plate 13 through the plug-in hole 131 .

[0067] Preferably, the rotor assembly 2 includes a rotor bracket 21 and a magnetic steel sheet 22 which are connected to each other. The rotor bracket 21 is connected to the gear speed change mechanism 6 and is sleeved outside the stator assembly 3. The rotor bracket 21 rotates around the stator assembly 3 with the central axis 4 as the axis. The magnetic steel sheet 22 is located between the rotor bracket 21 and the stator assembly 3.

[0068] Preferably, it further includes a magnetic signal sensor 9 , which is arranged on the housing 1 and corresponds to the magnetic steel sheet 22 , and is connected to the control system 5 .

[0069] Preferably, the housing 1 is provided with a sensor bracket 14 at a position corresponding to the magnetic signal sensor 9 , and the sensor bracket 14 is adapted to and fixes the magnetic signal sensor 9 .

[0070] Preferably, the middle partition plate 13 is provided with a concave guide groove 132 at a position corresponding to the rotor assembly 2 , and the cross section of the guide groove 132 is U-shaped.

[0071] Preferably, a through slot 211 is provided on the rotor support 21 .

[0072] Preferably, the notches 211 are arranged at the edge of the side wall of the rotor support 21 , and the number of the notches 211 is more than two.

[0073] Preferably, the rotor bracket 21 is provided with an oil stirring blade 212 at a position corresponding to the notch 211 , and the oil stirring blade 212 is a sheet-like protrusion.

[0074] Preferably, the control system 5 and the rotor assembly 2 are transversely arranged inside the first cavity 11 , and the setting height of the control system 5 is lower than the setting height of the rotor assembly 2 .

[0075] Preferably, the casing 1 comprises a side cover 15 and a casing body 16 , the side cover 15 is detachably connected to the casing body 16 , and the middle partition 13 is arranged on the casing body 16 .

[0076] Preferably, a sealing gasket 17 is further included, and the sealing gasket 17 is located between the side cover 15 and the shell body 16 , and the sealing gasket 17 is adapted to the side cover 15 and the shell body 16 .

[0077] Preferably, the side cover 15 is provided with a sealing gasket groove 18 at a position corresponding to the sealing gasket 17 , and the sealing gasket groove 18 is adapted to the sealing gasket 17 .

[0078] Preferably, the housing 1 is provided with a wire clamping slot 19 , and the wire clamping slot 19 is located outside the side cover 15 corresponding to the second cavity 12 .

[0079] Preferably, it further includes a first oil-proof breathable valve 112, which has an oil-proof breathable membrane built therein, and a first through-hole 113 is provided on the first cavity 11, and the first oil-proof breathable valve 112 is adapted to and seals the first hole 113.

[0080] Preferably, a second oil-proof breathable valve 122 is further included, wherein the second oil-proof breathable valve 122 has an oil-proof breathable membrane built therein, and a second breathable hole 123 is provided on the second cavity 12, and the second oil-proof breathable valve 122 is adapted to and seals the second breathable hole 123.

[0081] Preferably, the central shaft 4 passes through the stator assembly 3 , the rotor assembly 2 , the gear speed change mechanism 6 , and the clutch 7 .

[0082] Preferably, a pedal crank 41 is further included, and the pedal crank 41 is connected to the portion of the middle shaft 4 extending outside the casing 1 .

[0083] Preferably, a sprocket bracket 71 is further included, and the sprocket bracket 71 is connected to the clutch 7 .

[0084] When the motor needs to be started, a start signal is sent through the control system 5, and the stator assembly 3 is energized. At this time, the magnetic steel sheet 22 rotates around the stator assembly 3 with the central axis 4 as the axis under the action of the magnetic field force, and drives the rotor bracket 21 to rotate together. The gear speed change mechanism 6 rotates under the drive of the rotor bracket 21, and the rotating gear speed change mechanism 6 drives the clutch 7 to rotate, and finally the clutch 7 outputs the power of the motor through the sprocket bracket 71.

[0085] During this process, the insulating coolant 111 in the first cavity 11 flows under the stirring of the rotor bracket 21, and the insulating coolant 111 in the guide groove 132 flows to the stator assembly 3 through the notch 211. At the same time, under the push of the oil stirring blade 212, the insulating coolant 111 on one side of the guide groove 132 is transported to the top of the control system 5, and then flows into the control system 5 from the top of the control system 5 and contacts the control system 5, and then flows back to the side of the guide groove 132 to realize the circulation of the insulating coolant. The insulating coolant 111 fully contacts and exchanges heat with the control system 5, the stator assembly 3 and other heat-generating components, and then transfers the heat to the casing 1, and then dissipates it to the external air.

[0086] The magnetic signal sensor 9 accurately transmits the position information of the rotor assembly 2 to the control system 5 by sensing the magnetic field at the end of the magnetic steel sheet 22. When the temperature is too high or the speed is too fast, the control system 5 issues a command to reduce the speed, thereby reducing the speed of the rotor assembly 2. When it is necessary to stop the motor, a stop signal is issued by the control system 5, and the motor gradually stops working.

[0087] As the motor works for a longer time, the temperature and air pressure in the casing 1 gradually increase, and the gas in the first cavity 11 flows to the outside of the casing 1 through the first oil-proof vent valve 112. The gas in the second cavity 12 flows to the outside of the casing 1 through the second oil-proof vent valve 122. When the motor stops working, the temperature and air pressure in the casing 1 gradually decrease, and the gas outside the casing 1 flows into the inside of the casing 1 through the first oil-proof vent valve 112 and the second oil-proof vent valve 122.

[0088] When human power is used, the pedal crank 41 drives the middle shaft 4 to rotate, and the middle shaft 4 drives the clutch 7 to work, and finally the clutch 7 outputs the human power through the sprocket bracket 71.

[0089] In conclusion, the above is only a preferred embodiment of the present invention, and all equivalent changes and modifications made within the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A same-cavity liquid-cooled mid-mounted motor, comprising a housing (1), a central shaft (4), a stator assembly (3), a rotor assembly (2), a gear speed change mechanism (6), a clutch (7), and a control system (5), wherein the central shaft (4) passes through the housing (1) and extends out of the housing (1), the stator assembly (3) is sleeved inside the rotor assembly (2) and connected to the housing (1), the clutch (7) is respectively connected to the central shaft (4) and the gear speed change mechanism (6), and the control system (5) is connected to the stator assembly (3), characterized in that: The machine also comprises an insulating coolant (111), a gear lubricating oil (121), and a middle partition (13); the middle partition (13) is arranged in the housing (1); the middle partition (13) divides the interior of the housing (1) into a first cavity (11) and a second cavity (12); the central shaft (4) passes through the middle partition (13); the gear speed change mechanism (6) passes through the middle partition (13) and is connected to the rotor assembly (2); the stator assembly (3), the rotor assembly (2), the insulating coolant (111), and the control system (5) are arranged in the first cavity (11); and the gear speed change mechanism (6), the clutch (7), and the gear lubricating oil (121) are arranged in the second cavity (12); The rotor assembly (2) comprises a rotor support (21) and a magnetic steel sheet (22) which are connected to each other; the rotor support (21) is connected to the gear speed change mechanism (6) and is sleeved outside the stator assembly (3); the rotor support (21) rotates around the stator assembly (3) with the central axis (4) as the axis; and the magnetic steel sheet (22) is located between the rotor support (21) and the stator assembly (3); The middle partition plate (13) is provided with an inwardly concave guide groove (132) at a position corresponding to the rotor assembly (2), and the cross section of the guide groove (132) is U-shaped; The rotor support (21) is provided with a through slot (211); The central shaft (4) passes through the stator assembly (3), the rotor assembly (2), the gear speed change mechanism (6), and the clutch (7).

2. A same-cavity liquid-cooled mid-mounted motor according to claim 1, characterized in that: It also comprises a central control module (8), wherein the central control module (8) is arranged in the second cavity (12), and the central control module (8) is connected to the control system (5).

3. A same-cavity liquid-cooled mid-mounted motor according to claim 2, characterized in that: It also includes a wiring plug-in (133), wherein the wiring plug-in (133) is arranged on the middle partition (13) and penetrates the middle partition (13), and the central control module (8) and the control system (5) are connected via the wiring plug-in (133).

4. A same-cavity liquid-cooled mid-mounted motor according to claim 3, characterized in that: The middle partition plate (13) is provided with a through plug-in hole (131), and the wiring plug-in (133) passes through the middle partition plate (13) through the plug-in hole (131).

5. The same cavity liquid-cooled mid-mounted motor according to claim 1, characterized in that: It also includes a magnetic signal sensor (9), which is arranged on the housing (1) and corresponds to the magnetic steel sheet (22), and is connected to the control system (5).

6. The same cavity liquid-cooled mid-mounted motor according to claim 5, characterized in that: The housing (1) is provided with a sensor bracket (14) at a position corresponding to the magnetic signal sensor (9); the sensor bracket (14) is adapted to the magnetic signal sensor (9) and fixes the magnetic signal sensor (9).

7. The same cavity liquid-cooled mid-mounted motor according to claim 1, characterized in that: The notches (211) are arranged on the edge of the side wall of the rotor support (21), and the number of the notches (211) is more than two.

8. The same cavity liquid-cooled mid-mounted motor according to claim 7, characterized in that: The rotor support (21) is provided with an oil stirring blade (212) at a position corresponding to the notch (211); the oil stirring blade (212) is a sheet-shaped protrusion.

9. The same cavity liquid-cooled mid-mounted motor according to claim 8, characterized in that: The control system (5) and the rotor assembly (2) are arranged transversely inside the first cavity (11), and the arrangement height of the control system (5) is lower than the arrangement height of the rotor assembly (2).

10. The same cavity liquid-cooled mid-mounted motor according to claim 1, characterized in that: The casing (1) comprises a side cover (15) and a casing body (16); the side cover (15) is detachably connected to the casing body (16); and the middle partition plate (13) is arranged on the casing body (16).

11. The same cavity liquid-cooled mid-mounted motor according to claim 10, characterized in that: It also comprises a sealing gasket (17), wherein the sealing gasket (17) is located between the side cover (15) and the shell body (16), and the sealing gasket (17) is compatible with the side cover (15) and the shell body (16).

12. The same cavity liquid-cooled mid-mounted motor according to claim 11, characterized in that: The side cover (15) is provided with a sealing gasket groove (18) at a position corresponding to the sealing gasket (17), and the sealing gasket groove (18) is adapted to fit the sealing gasket (17).

13. The same cavity liquid-cooled mid-mounted motor according to claim 10, characterized in that: The housing (1) is provided with a wire clamping slot (19), and the wire clamping slot (19) is located outside the side cover (15) corresponding to the second cavity (12).

14. The same cavity liquid-cooled mid-mounted motor according to claim 1, characterized in that: The first cavity (11) is provided with a first through-hole (113), and the first oil-proof breathable valve (112) is adapted to the first breathable hole (113) and seals the first breathable hole (113).

15. The same cavity liquid-cooled mid-mounted motor according to claim 14, characterized in that: The second oil-proof breathable valve (122) is provided with an oil-proof breathable membrane, the second cavity (12) is provided with a second breathable hole (123) extending therethrough, and the second oil-proof breathable valve (122) is adapted to the second breathable hole (123) and seals the second breathable hole (123).

16. The same cavity liquid-cooled mid-mounted motor according to claim 1, characterized in that: It also comprises a pedal crank (41), wherein the pedal crank (41) is connected to the portion of the middle shaft (4) extending outside the housing (1).

17. The same cavity liquid-cooled mid-mounted motor according to claim 1, characterized in that: It also includes a sprocket bracket (71), wherein the sprocket bracket (71) is connected to the clutch (7).

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