Liquid-cooled wheel motor

Abstract

The application discloses a liquid-cooled hub motor, which comprises a motor body, a stator support and a stator assembly, and further comprises a wire harness sealing and ventilation mechanism and a liquid cooling mechanism; the wire harness sealing and ventilation mechanism comprises a wire harness hole extending to the outside of the stator support along one end of a rotating shaft, and a wire harness pipe is arranged in the wire harness hole; the wire harness pipe comprises an inner pipe, a gas-permeable mesh pipe and a sealing outer pipe arranged from inside to outside; and the liquid cooling mechanism comprises cooling grooves arranged spirally along the periphery of the stator support; in the application, the wire harness pipe is arranged in the wire harness hole for installing the wire harness; when a pressure difference is generated between the inside of the motor cavity and the outside environment, the motor cavity and the outside environment exchange gas through the gas-permeable mesh pipe, so that the pressure of the motor cavity and the outside environment is kept stable, and the wire harness structure is kept sealed and installed; the liquid cooling mechanism adopts a double-channel structure for cooling, so that the flowing distance of the cooling liquid is shortened, the cooling and heat dissipation effect of the stator assembly is improved, and the motor is kept to operate at a normal temperature.

Description

Technical Field

[0001] This invention relates to the field of hub motor technology, and specifically to a liquid-cooled hub motor. Background Technology

[0002] The waterproof sealing of an electric motor is one of the important performance indicators affecting its normal operation. In existing technology, a cable pass-through hole is provided on the motor shaft, through which external connecting cables enter the motor cavity and connect to the phase wires on the stator inside the motor cavity. A certain gap exists between the cable pass-through hole and the external connecting cable. These gaps serve to facilitate gas exchange between the motor cavity and the external environment and to maintain stable internal and external pressure. Specifically, when the internal temperature of the motor rises, the internal pressure increases, creating a positive pressure difference with the outside, allowing gas inside the motor cavity to escape through these gaps. When the motor cools down, the internal pressure decreases, creating a negative pressure difference with the outside, allowing external gas to be drawn into the motor cavity through these gaps. However, the shape of the gap formed by the cable pass-through hole and the external connecting cable is variable. It is often impossible to directly install waterproof and breathable devices within these gaps, rendering them non-waterproof. When external gas enters the motor cavity, moisture mixed in with the gas will enter the motor cavity through these gaps, causing water ingress and potentially leading to motor malfunction.

[0003] In addition, since the heat of the motor is mainly generated by the stator, the existing hub motor stator heat dissipation mostly relies on the heat conduction between itself and the air medium, which has low heat dissipation efficiency. Excessive temperature rise can cause hidden dangers such as demagnetization of permanent magnets and accelerated aging of coil insulation layers. In contrast, the coolant in liquid-cooled motors is constantly flushed and splashed inside the motor, which can easily cause aging of the magnet adhesive and conductor insulation layer, resulting in safety hazards such as magnet detachment and motor leakage. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a liquid-cooled hub motor that features a waterproof and breathable structure to ensure stable internal pressure and a heat dissipation structure to efficiently cool the motor stator structure, preventing damage to the motor due to high temperatures.

[0005] The technical solution adopted in this invention is: a liquid-cooled hub motor, comprising a motor body, the motor body including a rotating shaft, a stator support and a stator assembly mounted on the rotating shaft, a rotor assembly and a housing assembly further provided on the outside of the stator, and a wiring harness sealing and ventilation mechanism and a liquid cooling mechanism; the wiring harness sealing and ventilation mechanism includes a wiring harness hole extending from one end of the rotating shaft to the outside of the stator support, a wiring harness tube passing through the wiring harness hole, the wiring harness tube including an inner tube, a venting mesh tube and a sealing outer tube arranged from the inside to the outside, the venting mesh tube having a plurality of honeycomb-shaped ventilation channels arranged along its axial direction, and the wiring harness mesh tube being connected to an end corresponding to the end of the rotating shaft. The end cap has a sealing sleeve on its inner side that can be inserted into the end of the inner tube, and an outlet hole on its outer end that allows the wire harness to pass through the sealing sleeve. The end cap also has a waterproof and breathable membrane fitted onto the sealing sleeve. The liquid cooling mechanism includes a cooling tank spirally arranged along the outer circumference of the stator support. The stator support has inlet ports at both ends corresponding to the cooling tank that communicate with the cooling tank. The stator support has an outlet port in the middle of the cooling tank that communicates with the cooling tank. The stator support has an output pipe and an input pipe that are respectively connected to the output port and the two inlet ports. Coolant flowing from the input pipe through the two output inlets can flow to the output port and out through the output pipe.

[0006] This technical solution incorporates a wiring harness sealing and ventilation mechanism and a liquid cooling mechanism on the hub motor to improve its ventilation and cooling effects. The wiring harness sealing and ventilation mechanism utilizes a wiring harness tube inserted into the wiring harness hole for installation. The three-layer structure of the wiring harness tube ensures the stability of the wiring harness, while the honeycomb structure of the ventilated mesh tube maintains communication between the motor housing and the external environment. This honeycomb structure increases airflow space and improves ventilation efficiency. When a pressure difference exists between the motor cavity and the external environment, gas exchange occurs through the ventilated mesh tube, maintaining a stable pressure between the motor cavity and the external environment. The sealing outer tube is sealed to the wiring hole, and the end cap at the end is inserted into the inner tube using a sealing sleeve to further ensure a sealed installation of the wiring harness structure, preventing moisture and other substances from corroding the wiring harness. During ventilation, a waterproof and breathable membrane blocks moisture mixed in with the external air, preventing water from entering the motor. The liquid cooling mechanism in this technical solution adopts a dual-channel structure for cooling. The inlet ports at both ends of the cooling tank simultaneously supply coolant to the cooling tank, and the cooled coolant after heat exchange is output from the outlet port in the middle of the stator support. The stator structure of the motor is cooled by bidirectional convection, which can shorten the flow distance of the coolant, thereby improving the cooling and heat dissipation effect on the stator assembly and ensuring that the motor maintains normal operating temperature.

[0007] Furthermore, the rotating shaft is provided with an injection hole on the outer periphery of the outer side of the housing assembly, and the outer periphery of the sealing outer tube is provided with continuously arranged threaded grooves.

[0008] Furthermore, the inner tube is fitted with an elastic retainer, and the retainer has multiple wiring grooves on its outer periphery.

[0009] Furthermore, the inner side of the end cap is provided with a retaining piece that fits into the waterproof and breathable membrane, and the retaining piece is arranged in a hollowed-out manner.

[0010] Furthermore, the end cap opposite to the pivot is provided with a shielding portion arranged around the outer periphery of the ventilated mesh tube.

[0011] Furthermore, the outer diameter of the sealing sleeve at the end near the end cap is larger than the outer diameter at the end away from the end cap, so that the axial cross-section of the sealing sleeve is arranged in a conical shape.

[0012] Furthermore, the stator support has a sealing groove arranged along the spiral direction of the cooling groove on its outer periphery, and the end face of the stator support has an injection hole communicating with the sealing groove. The sealing groove is filled with sealing fluid that fills the gap between the outer periphery of the stator support and the inner periphery of the stator assembly.

[0013] Furthermore, the inner peripheral wall of the stator assembly is provided with a heat dissipation groove and an adhesive injection groove arranged opposite to the cooling groove and the sealing groove, respectively.

[0014] Furthermore, a cooling bracket is mounted on the rotating shaft that is rotatably engaged with the end of the housing assembly. The cooling bracket is provided with a circulation hole through which the output pipe and the input pipe pass. A fitting sleeve that is fitted onto the input pipe and the output pipe passes through the circulation hole.

[0015] Furthermore, the input and output pipes are fitted with heat insulation pipes.

[0016] The beneficial effects of this invention are as follows: This invention provides a wiring harness sealing and ventilation mechanism and a liquid cooling mechanism on the hub motor to improve the ventilation and cooling effects of the hub motor. The wiring harness sealing and ventilation mechanism utilizes a wiring harness tube inserted into the wiring harness hole for wiring harness installation, and adopts a honeycomb structure to maintain communication between the inside and outside of the motor housing. When a pressure difference occurs between the inside of the motor cavity and the external environment, gas exchange occurs between the motor cavity and the external environment through a permeable mesh, keeping the pressure between the motor cavity and the external environment stable and ensuring the wiring harness structure remains sealed. The liquid cooling mechanism uses a dual-channel structure for cooling, employing bidirectional convection to cool the stator structure of the motor, which shortens the coolant flow distance, thereby improving the cooling and heat dissipation effect on the stator assembly and ensuring the motor maintains normal operating temperature. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0018] Figure 1 This is a cross-sectional view of the liquid-cooled hub motor provided in an embodiment of the present invention.

[0019] Figure 2 This is a cross-sectional view of the wiring harness of the liquid-cooled hub motor provided in an embodiment of the present invention.

[0020] Figure 3 This is a cross-sectional view of the stator support of the liquid-cooled hub motor provided in an embodiment of the present invention.

[0021] Reference numerals: Shaft 100, Injection hole 110, Stator support 200, Sealing groove 210, Stator assembly 300, Rotor assembly 400, Housing assembly 500, Wiring harness tube 600, Inner tube 610, Ventilation mesh tube 620, Sealing outer tube 630, End cap 700, Sealing sleeve 710, Shielding part 720, Waterproof and breathable membrane 800, Cooling tank 900, Inlet 1000, Outlet 1100, Outlet pipe 1200, Inlet pipe 1300, Cage 1400, Cage plate 1500, Cooling bracket 1600, Assembly pipe 1700. Detailed Implementation

[0022] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0023] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by those skilled in the art to which this invention pertains.

[0024] Example 1

[0025] like Figures 1 to 3As shown, a specific embodiment of the present invention provides a liquid-cooled hub motor, including a motor body. The motor body includes a rotating shaft 100, a stator bracket 200 and a stator assembly 300 mounted on the rotating shaft 100, and a rotor assembly 400 and a housing assembly 500 on the outside of the stator. This embodiment provides a wire harness sealing and ventilation mechanism to solve the problem of low ventilation efficiency caused by the irregular gap between the motor wiring hole and the external connecting cable. The wire harness sealing and ventilation mechanism includes a wire harness hole extending along one end of the rotating shaft 100 to the outside of the stator bracket 200. A wire harness tube 600 is inserted into the wire harness hole. The wire harness tube 600 includes an inner tube 610, a breathable mesh tube 620, and a sealing outer tube 630 arranged from the inside to the outside. The breathable mesh tube 620 has several honeycomb-shaped ventilation channels arranged along its axial direction. An end cap 700 is connected to the end of the wire harness mesh tube corresponding to the rotating shaft 100. The end cap 700 has a sealing sleeve 710 that can be inserted into the end of the inner tube 610 on its inner side. The end cap 700 has an outlet hole that passes through the sealing sleeve 710 for the wire harness to pass through. A waterproof and breathable membrane 800 is sleeved on the sealing sleeve 710 on the inner side of the end cap 700.

[0026] like Figures 1 to 3 As shown, through the above-described configuration, this embodiment incorporates a wiring harness sealing and ventilation mechanism on the hub motor to improve its ventilation effect. This is primarily achieved by using a wiring harness tube 600 inserted into the wiring harness hole for wiring harness installation. Since the wiring harness tube 600 employs a three-layer structure, the inner tube 610 ensures the stability of the wiring harness, and the ventilated mesh tube 620 uses a honeycomb structure to maintain communication between the inside and outside of the motor housing. The honeycomb structure increases airflow space and improves ventilation efficiency. When a pressure difference arises between the inside of the motor cavity and the external environment, gas exchange occurs between the motor cavity and the external environment through the ventilated mesh tube 620. The pressure between the motor cavity and the external environment is kept stable. The outer sealing tube 630 is sealed to the wire hole. The end cap 700 at the end is inserted into the inner tube 610 using a sealing sleeve 710 to further ensure that the wire harness structure is sealed and to prevent water vapor from corroding the wire harness. During the ventilation process, the waterproof and breathable membrane 800 blocks water vapor mixed in the external air to prevent water from entering the motor. In this embodiment, the wire harness sealing and ventilation mechanism integrates the wire harness installation and the motor ventilation structure, eliminating the need for additional ventilation or wire harness sealing structures, improving the compactness of the motor structure and reducing production costs.

[0027] like Figures 1 to 3As shown, the wire harness tube 600 passes through the wire harness hole. It is necessary to maintain the seal of the wire harness hole after installation to ensure a complete seal between the tube and the wire harness hole. In this embodiment, an injection hole 110 is provided on the outer periphery of the outer casing assembly 500 corresponding to the rotating shaft 100. The outer periphery of the sealing outer tube 630 is provided with continuously arranged threaded grooves. Thus, after the wire harness tube 600 is installed and inserted into the wire harness hole, adhesive is injected through the injection hole 110 to fill the gap between the wire harness hole and the sealing outer tube 630. Since the outer periphery of the sealing outer tube 630 has sealing grooves, the sealant injected through the injection hole 110 fills the sealing grooves and then cures, thereby completing the fixing and sealing of the tube.

[0028] As mentioned earlier, the wiring harness of the hub motor exits the motor through the inner tube 610. To maintain the stability of the wiring harness, this embodiment provides an elastic retainer 1400 through the inner tube 610, with multiple wiring grooves on the outer periphery of the retainer 1400. After the wiring harness is inserted into the inner tube 610, it can be embedded in the wiring grooves on the retainer 1400, thereby fixing the wiring harness. Because the retainer 1400 is elastic, after the wiring harness is inserted into the inner tube 610, it completely fills the inner tube 610 due to the elasticity of the retainer 1400.

[0029] like Figures 1 to 3 As shown, in this embodiment, an end cap 700 structure for fixing the pipeline and ventilating is provided at the end of the wire bundle tube 600. A waterproof and breathable membrane 800 is installed inside the end cap 700 to prevent water from entering during ventilation. To ensure the stability of the waterproof and breathable membrane 800, a retaining piece 1500 is provided inside the end cap 700 to fit against the waterproof and breathable membrane 800. The retaining piece 1500 is arranged in a hollowed-out manner. By fitting the retaining piece 1500 against the waterproof and breathable membrane 800, the waterproof and breathable membrane 800 is kept in a fully expanded state, improving the water vapor blocking effect. At the same time, this embodiment also provides a shielding part 720 arranged around the outer periphery of the breathable mesh tube 620 at the end of the end cap 700 away from the rotating shaft 100. The shield 720 protrudes from the outside of the motor, thus forming a shield for the port of the ventilated mesh 620, which protects the ventilated mesh 620 and also prevents moisture from entering through the opening of the end cover 700.

[0030] As mentioned earlier, the sealing sleeve 710 at the end of the end cap 700 near the inner tube 610 needs to be inserted into the inner tube 610. In this embodiment, the outer diameter of the sealing sleeve 710 at the end near the end cap 700 is larger than the outer diameter at the end away from the end cap 700, making the axial cross-section of the sealing sleeve 710 conical. When the sealing sleeve 710 is inserted into the inner tube 610, the conical structure of the sealing sleeve 710 can completely seal the port of the inner tube 610, resulting in higher sealing performance of the wire harness installation.

[0031] Example 2

[0032] like Figures 1 to 3As shown, this embodiment further optimizes the heat exchange and cooling structure of the hub motor, providing a liquid cooling structure to improve the cooling effect on the internal stator structure of the motor. Specifically, the liquid cooling mechanism includes a cooling tank 900 spirally arranged along the outer periphery of the stator support 200. The stator support 200 is provided with input ports 1000 communicating with the cooling tank 900 at both ends. The stator support 200 is provided with an output port 1100 communicating with the cooling tank 900 in the middle. The stator support 200 is provided with an output pipe 1200 and an input pipe 1300 respectively connected to the output port 1100 and the two input ports 1000. The coolant flowing from the input pipe 1300 through the two output ports can flow to the output port 1100 and flow out through the output pipe 1200. With the above configuration, the liquid cooling mechanism provided in this embodiment adopts a dual-channel structure for cooling. The inlet ports 1000 at both ends of the cooling tank 900 simultaneously supply coolant to the cooling tank 900. The coolant after heat exchange is output from the outlet port 1100 in the middle of the stator support 200. The stator structure of the motor is cooled by bidirectional convection, which can shorten the flow distance of the coolant and thus improve the cooling and heat dissipation effect on the stator assembly 300 and the outer periphery of the internal motor support and other areas that are prone to heat generation, ensuring that the motor maintains normal operating temperature.

[0033] As mentioned above, this embodiment provides a dual-channel rapid cooling structure located between the outer periphery of the stator support 200 and the stator assembly 300. To ensure the sealing effect of the coolant flow, this embodiment provides a sealing groove arranged spirally along the cooling channel 900 on the outer periphery of the stator support 200. The end face of the stator support 200 is provided with an injection hole communicating with the sealing groove. The sealing groove is filled with sealing fluid to fill the gap between the outer periphery of the stator support 200 and the inner periphery of the stator assembly 300. In this way, after the stator support 200 and the stator assembly 300 are assembled, the gap between the outer periphery of the stator support 200 and the stator assembly 300 is sealed by injecting sealing fluid into the sealing groove, preventing coolant leakage. In addition, to increase the heat exchange area and the sealing area of ​​the sealing fluid, this embodiment provides a heat dissipation groove and a glue injection groove arranged opposite to the cooling channel 900 and the sealing groove on the inner peripheral wall of the stator assembly 300. The heat dissipation groove and the cooling groove 900 together form a space for coolant flow, thereby improving heat exchange efficiency, while the glue injection groove can increase the amount of sealant injected, so that the gap between the outer periphery of the stator support 200 and the inner periphery of the stator assembly 300 is completely filled.

[0034] In practical applications, the input pipe 1300 and output pipe 1200 used for conveying coolant need to extend beyond the motor housing. To facilitate this, this embodiment includes a cooling bracket 1600 mounted on the shaft 100, which rotatably engages with the end of the housing assembly 500. The cooling bracket 1600 has a circulation hole through which the output pipe 1200 and input pipe 1300 pass. A fitting sleeve 1700, which is fitted onto the input pipe 1300 and output pipe 1200, passes through the circulation hole. The cooling bracket 1600, after rotatably engaging with the housing, can be fixed to the shaft 100 structure. The sleeve structure within the circulation hole ensures the sealing of the pipe penetration points. Since coolant is conveyed within the pipe structure, this embodiment includes heat insulation pipes fitted onto the input pipe 1300 and output pipe 1200. These heat insulation pipes provide insulation for the coolant, improving heat exchange efficiency.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A liquid-cooled hub motor, comprising a motor body, the motor body including a rotating shaft (100), a stator bracket (200) and a stator assembly (300) mounted on the rotating shaft (100) and cooperating with each other, and a rotor assembly (400) and a housing assembly (500) further provided on the outer side of the stator, characterized in that, It also includes a wire harness sealing and ventilation mechanism and a liquid cooling mechanism; The wire harness sealing and ventilation mechanism includes a wire harness hole extending from one end of the rotating shaft (100) to the outside of the stator support (200). A wire harness tube (600) is inserted into the wire harness hole. The wire harness tube (600) includes an inner tube (610), a breathable mesh tube (620), and a sealing outer tube (630) arranged from the inside to the outside. The breathable mesh tube (620) has a plurality of honeycomb-shaped ventilation channels arranged along its axial direction. An end cap (700) is connected to the end of the wire harness mesh tube corresponding to the end of the rotating shaft (100). The end cap (700) has a sealing sleeve (710) inside that can pass through the end of the inner tube (610). The end cap (700) has an outlet hole through the sealing sleeve (710) for the wire harness to pass through. The end cap (700) has a waterproof and breathable membrane (800) sleeved on the sealing sleeve (710) inside. The liquid cooling mechanism includes a cooling tank (900) spirally arranged along the outer periphery of the stator support (200). The stator support (200) has an inlet (1000) at both ends corresponding to the cooling tank (900) and an outlet (1100) in the middle corresponding to the cooling tank (900) and communicating with the cooling tank (900). The stator support (200) is provided with an output pipe (1200) and an input pipe (1300) respectively connected to the outlet (1100) and the two inlets (1000). Coolant flowing from the input pipe (1300) through the two inlets and outlets can flow to the outlet (1100) and out through the output pipe (1200).

2. The liquid-cooled hub motor according to claim 1, characterized in that, The rotating shaft (100) has an injection hole (110) on the outer periphery of the outer side of the housing assembly (500), and the outer periphery of the sealing outer tube (630) has continuously arranged threaded grooves.

3. The liquid-cooled hub motor according to claim 1, characterized in that, The inner tube (610) is fitted with an elastic retainer (1400), and the retainer (1400) has multiple wiring grooves on its outer periphery.

4. The liquid-cooled hub motor according to claim 1, characterized in that, The end cap (700) has a retaining piece (1500) on its inner side that is attached to the waterproof and breathable membrane (800), and the retaining piece (1500) is arranged in a hollowed-out manner.

5. The liquid-cooled hub motor according to claim 1, characterized in that, The end cap (700) is provided with a shield (720) arranged around the outer periphery of the ventilated mesh tube (620) at one end away from the rotating shaft (100).

6. The liquid-cooled hub motor according to claim 1, characterized in that, The outer diameter of the sealing sleeve (710) near the end cap (700) is larger than the outer diameter of the end away from the end cap (700), so that the axial section of the sealing sleeve (710) is arranged in a conical shape.

7. The liquid-cooled hub motor according to claim 1, characterized in that, The stator support (200) has a sealing groove arranged in the spiral direction of the cooling groove (900) on its outer periphery. The end face of the stator support (200) has an injection hole communicating with the sealing groove. The sealing groove is filled with sealing liquid that fills the gap between the outer periphery of the stator support (200) and the inner periphery of the stator assembly (300).

8. The liquid-cooled hub motor according to claim 7, characterized in that, The inner peripheral wall of the stator assembly (300) is provided with a heat dissipation groove and an adhesive injection groove, which are arranged opposite to the cooling groove (900) and the sealing groove, respectively.

9. The liquid-cooled hub motor according to claim 1, characterized in that, A cooling bracket (1600) is mounted on the rotating shaft (100) and is rotatably fitted to the end of the housing assembly (500). The cooling bracket (1600) is provided with a circulation hole through which the output pipe (1200) and the input pipe (1300) pass. A fitting pipe (1700) is fitted into the circulation hole and sleeved on the input pipe (1300) and the output pipe (1200).

10. The liquid-cooled hub motor according to claim 1, characterized in that, The input pipe (1300) and output pipe (1200) are fitted with heat insulation pipes.

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