Liquid-cooled hub motor

Abstract

The invention discloses a liquid cooling hub motor, and relates to the technical field of hub motors. The rotor is used for driving the rim to rotate; the stator support is rotationally arranged on the inner circumferential side face of the rotor, and a stator is arranged on the outer circumferential side face of the stator support; and the cooling flow channel is integrally in a wave shape and is arranged in the stator support in a surrounding mode, an inlet channel is formed in the first end of the cooling flow channel, and an outlet channel is formed in the second end of the cooling flow channel. According to the liquid-cooled hub motor, the technical problem that the hub motor is overheated when the hub motor is continuously used at overpower in the prior art is solved, the cooling liquid is circularly input into the cooling flow channel through the inlet channel, heat on the stator support is taken away, and the performance of the hub motor can still be kept unchanged when the hub motor is continuously used at overpower. And the overall structure of the cooling flow channel accords with fluid mechanics, and the cooling liquid does not form turbulent flow and vortex when flowing in the cooling flow channel, so that the energy consumption required for driving the cooling liquid to flow can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of wheel hub motors, and in particular to a liquid-cooled wheel hub motor. Background Art

[0002] The wheel hub motor uses an outer rotor structure motor, and the rotor part is integrated with the wheel rim. The stator part is wrapped by the shell and the rotor part as a whole, and the stator part is the heat source of the motor. Since the stator part and the shell are not in contact, the air in the middle hinders the rapid conduction of heat, causing the motor temperature to continue to rise, inhibiting the continuous performance of the motor, and the wheel hub motor will overheat under continuous use of overpower, resulting in the degradation of the wheel hub motor performance and demagnetization.

[0003] In the prior art, the motor performance is kept in the optimal range through the motor liquid cooling technology. The liquid cooling motor technology is to directly add coolant into the motor, install an oil and gas filter device inside the motor, and connect the oil and gas filter device to an air duct. When the stator component heats up, the coolant absorbs the heat, and the heat is conducted through the coolant contacting the shell. However, the stator flow channel structure is completed by die casting, and there are pores inside the die casting alloy material. The probability of pore leakage after processing is high. In this case, the flow channel formed by the die casting alloy material is prone to coolant leakage as the hot and cold alternating aging occurs, thereby reducing the performance and damaging the whole machine. Therefore, a liquid-cooled hub motor is proposed to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a liquid-cooled wheel hub motor, which solves the technical problem in the prior art that the wheel hub motor may overheat when the wheel hub motor is continuously used at excessive power.

[0005] To achieve the above object, the present invention provides a liquid-cooled hub motor, comprising:

[0006] Rim;

[0007] A rotor, disposed on the inner circumference of the rim, and used to drive the rim to rotate synchronously;

[0008] A stator bracket is rotatably arranged on the inner peripheral side of the rotor, and a stator is arranged on the outer peripheral side of the stator bracket, and the stator is used to drive the rotor to rotate;

[0009] The cooling channel is wavy in shape as a whole and is arranged around the inside of the stator bracket. The first end of the cooling channel is provided with an inlet channel for inputting coolant into the cooling channel, and the second end of the cooling channel is provided with an outlet channel for discharging the coolant in the cooling channel.

[0010] Preferably, a plurality of first assembly rods are arranged in an array inside the stator bracket, and two adjacent first assembly rods are combined to form a first U-shaped groove. A cooling channel cover plate is provided on the side of the stator bracket, and a plurality of second assembly rods are arranged in an array on a side of the cooling channel cover plate close to the stator bracket, and two adjacent second assembly rods are combined to form a second U-shaped groove. When the cooling channel cover plate is connected to the stator bracket, each of the first U-shaped grooves is staggeredly connected to a second U-shaped groove to form the cooling channel.

[0011] Preferably, when the cooling channel cover plate is connected to the stator bracket, the first assembly rod and the side surface of the second U-shaped groove do not contact each other, and the second assembly rod and the side surface of the first U-shaped groove do not contact each other.

[0012] Preferably, an inlet and outlet channel cover plate is arranged on one side of the stator bracket where the cooling channel cover plate is arranged, and the inlet and outlet channel cover plate is used to seal the inlet channel and the outlet channel.

[0013] Preferably, a liquid inlet channel and a liquid outlet channel are provided on the side of the inlet and outlet channel cover plate, the liquid inlet channel is connected to the cooling channel and the inlet channel, and the liquid outlet channel is connected to the cooling channel and the outlet channel.

[0014] Preferably, a faucet pressure plate is arranged on the side of the stator bracket facing away from the inlet and outlet channel cover plate, and a sealing pressure plate is arranged on the side of the faucet pressure plate close to the stator bracket, the sealing pressure plate is used to seal the inlet channel and the outlet channel, and a water inlet pipe and a water outlet pipe are arranged on the faucet pressure plate, the water inlet pipe is connected to the inlet channel, and the water outlet pipe is connected to the outlet channel.

[0015] Preferably, a flat end cover is provided on one side of the stator bracket, and the flat end cover is used to protect the internal structure of the hub.

[0016] Preferably, an assembly hole is arranged at the axial position of the stator bracket, a motor shaft is coaxially arranged in the assembly hole, and the motor shaft is rotatably connected to the rotor.

[0017] Preferably, bearings are provided at both ends of the motor shaft, and the bearings are fixedly connected to the stator bracket.

[0018] Preferably, a brake end cover is provided on the side of the stator bracket opposite to the flat end cover, and the brake end cover is drivingly connected to the rotor.

[0019] Compared with the above background technology, the present invention provides a liquid-cooled hub motor, which has the following beneficial effects:

[0020] (1) During the use of the hub motor of the present invention, the heat generated by the stator component is transferred to the stator bracket through the stator, and the coolant is input into the cooling channel through the inlet channel. The coolant circulates from one end of the cooling channel to the other end of the cooling channel, taking away the heat on the stator bracket, effectively preventing the hub motor from overheating and demagnetization, so that the performance of the hub motor can remain unchanged under continuous use of overpower. Compared with directly adding coolant to the motor, the cooling channel set inside the stator bracket has a better sealing effect on the coolant. While ensuring the heat dissipation effect of the stator component, there will be no coolant leakage, thereby not affecting the performance of the hub motor and having better practicality.

[0021] (2) The cooling channel of the present invention is wavy in shape and surrounds the interior of the stator bracket. The structure of the cooling channel conforms to fluid mechanics. When the coolant flows in the cooling channel, the changes in speed and pressure are relatively gentle, and local high-speed areas and low-pressure areas are not easily generated as at right angles or sharp corners, thereby avoiding the formation of turbulence and vortices. The coolant encounters less resistance in the cooling channel, reducing the energy consumption required to drive the coolant to flow, thereby reducing the power demand of the pump. On the other hand, the wavy cooling channel can increase the contact area between the coolant and the stator bracket, thereby allowing the coolant to fully contact the stator bracket, further improving the heat dissipation effect of the stator components. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0023] FIG1 is a three-dimensional structural diagram of a liquid-cooled hub motor provided by an embodiment of the present invention;

[0024] FIG2 is a cross-sectional schematic diagram of a liquid-cooled hub motor provided by an embodiment of the present invention;

[0025] FIG3 is an exploded schematic diagram of a liquid-cooled hub motor provided by an embodiment of the present invention;

[0026] FIG4 is a partial cross-sectional schematic diagram of a liquid-cooled hub motor provided by an embodiment of the present invention;

[0027] FIG5 is a three-dimensional structural diagram of the liquid-cooled hub motor provided by an embodiment of the present invention after the inlet and outlet flow channel cover is hidden;

[0028] FIG6 is a schematic diagram of the flow direction of the coolant in the cooling channel provided by an embodiment of the present invention;

[0029] FIG7 is a schematic diagram of the overall flow direction of the coolant in the stator support provided by an embodiment of the present invention;

[0030] FIG. 8 is a plan view schematically showing the cooling channel provided by an embodiment of the present invention after being unfolded.

[0031] Specifically, 1-rotor; 2-stator bracket; 201-inlet channel; 202-outlet channel; 203-first assembly rod; 204-first U-shaped groove; 3-stator; 4-cooling channel; 5-cooling channel cover; 501-second assembly rod; 502-second U-shaped groove; 503-sealing ring; 6-faucet pressure plate; 7-inlet and outlet channel cover; 701-liquid inlet channel; 702-liquid outlet channel; 8-flat head end cover; 9-motor shaft; 10-bearing; 11-brake end cover; 12-sealing pressure plate; 13-water inlet pipe; 14-water outlet pipe; 15-matching cross structure. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] As shown in Figures 1, 2 and 3, in order to achieve the above-mentioned purpose, the present invention provides a liquid-cooled hub motor, including: a rim and a rotor 1 and a stator 3 arranged on the rim, wherein the rotor 1 is integrally arranged on the inner peripheral side of the rim, and the rotor 1 rotates synchronously with the rim.

[0035] The inner peripheral side of the rotor 1 is rotatably provided with a stator bracket 2, and the outer peripheral side of the stator bracket 2 is provided with a stator 3, and the stator 3 is used to drive the rotor 1 to rotate. Preferably, the stator 3 is a silicon steel sheet stator 3, and the silicon steel sheet has high magnetic permeability and low hysteresis characteristics, which can effectively reduce the magnetic field loss during the operation of the motor and improve the efficiency of the motor. Moreover, the high magnetic permeability of the silicon steel sheet enables the stator 3 core to enhance the magnetic field strength and generate a stronger magnetic field under the same current, thereby improving the output power and efficiency of the motor. On the other hand, it has a good supporting effect and increases the overall structural strength of the hub motor. In addition, a stator 3 winding is provided on the stator 3. After the stator 3 winding is passed through the three-phase alternating current, a rotating magnetic field will be generated. Through the interaction between the rotating magnetic field and the rotor 1, the stator 3 winding converts electrical energy into mechanical energy to drive the rotor 1 to operate.

[0036] It should be noted that the cooling channel 4 is arranged around the inside of the stator bracket 2, and the cooling channel 4 is wavy as a whole. The cooling channel 4 is wavy as a whole and is arranged around the inside of the stator bracket 2, which conforms to fluid mechanics. When the coolant flows in the cooling channel 4, the changes in speed and pressure are relatively gentle, and it is not easy to generate local high-speed areas and low-pressure areas as at right angles or sharp corners, avoiding the formation of turbulence and vortices. The coolant encounters less resistance in the cooling channel 4, reducing the energy consumption required to drive the coolant to flow, thereby reducing the power demand of the pump.

[0037] When in use, an inlet channel 201 is provided at one end of the cooling channel 4, and coolant is input into the cooling channel 4 through the inlet channel 201. An outlet channel 202 is provided at the other end of the cooling channel 4, and the coolant in the cooling channel 4 is discharged through the outlet channel 202, so that the coolant circulates in the cooling channel 4. The heat generated by the stator 3 components is transferred to the stator bracket 2 through the stator 3, and then the heat on the stator bracket 2 is taken away, which has a heat dissipation effect on the stator 3 components, effectively preventing the hub motor from overheating and demagnetization, so that the performance of the hub motor can remain unchanged under continuous use of overpower.

[0038] In one embodiment of the present invention, a plurality of first assembly rods 203 are arranged in an array inside the stator bracket 2, the first assembly rods 203 are integrally formed with the stator bracket 2, two adjacent first assembly rods 203 are combined to form a first U-shaped groove 204, the first assembly rods 203 extend a certain length along the axial direction of the stator bracket 2, so that the first U-shaped groove 204 has a certain width, a cooling flow channel cover plate 5 is arranged on the side of the stator bracket 2, and a plurality of second assembly rods 501 are arranged in an array on one side of the cooling flow channel cover plate 5 close to the stator bracket 2, two adjacent second assembly rods 501 are combined to form a second U-shaped groove 502, the second assembly rods 501 extend a certain length along the axial direction of the cooling flow channel cover plate 5, so that the second U-shaped groove 502 has a certain width, when the cooling flow channel cover plate 5 is connected to the stator bracket 2, each first U-shaped groove 204 is staggered and docked with a second U-shaped groove 502 to form a wavy cooling flow channel 4, and the cooling flow channel 4 is arranged in a surrounding manner inside the stator bracket 2.

[0039] It should be noted that when the cooling channel cover plate 5 is connected to the stator bracket 2, the first assembly rod 203 and the side of the second U-shaped groove 502 do not contact each other, and the second assembly rod 501 and the side of the first U-shaped groove 204 do not contact each other, effectively ensuring that the two ends of the cooling channel 4 always remain connected.

[0040] In addition, the cooling channel 4 is arranged inside the stator bracket 2. Compared with directly adding coolant into the motor, the cooling channel 4 arranged inside the stator bracket 2 has a better sealing effect on the coolant. While ensuring the heat dissipation effect of the stator 3 components, there will be no leakage of coolant, thereby not affecting the performance of the hub motor and having better practicality.

[0041] In one embodiment of the present invention, the stator bracket 2 is provided with an inlet and outlet channel cover plate 7 on one side of the cooling channel cover plate 5. When the inlet and outlet channel cover plate 7 is buckled on the side of the stator bracket 2, the inlet and outlet channel cover plate 7 can seal the inlet channel 201 and the outlet channel 202. At the same time, a liquid inlet channel 701 and a liquid outlet channel 702 are provided on the side of the inlet and outlet channel cover plate 7. After the inlet and outlet channel cover plate 7 is buckled on the side of the stator bracket 2, the liquid inlet channel 701 and the liquid outlet channel 702 are not connected to each other. The liquid inlet channel 701 connects the cooling channel 4 and the inlet channel 201. The coolant passes through the inlet channel 201 and the inlet channel 701 in turn and then enters the heat exchange channel. The liquid outlet channel 702 connects the cooling channel 4 and the outlet channel 202. After absorbing the heat of the stator bracket 2, the coolant is discharged from the heat exchange channel to the outlet channel 202, and is discharged from the outlet channel 202 and the liquid outlet channel 702 in turn, completing a single cycle of the coolant.

[0042] In addition, a nozzle pressure plate 6 is provided on the side of the stator bracket 2 away from the inlet and outlet channel cover plate 7, and a water inlet pipe 13 and a water outlet pipe 14 are provided on the nozzle pressure plate 6. The water inlet pipe 13 is connected to the inlet channel 201, and the water outlet pipe 14 is connected to the outlet channel 202. The water inlet pipe 13 is connected to a water pump (not shown in the figure), and the water outlet pipe 14 is connected to a water storage tank (not shown in the figure). The water pump sucks the coolant in the water storage tank and transports it to the inlet channel 201, and enters the heat exchange channel through the inlet channel 201 and the liquid inlet channel 701 in turn. The coolant discharged from the heat exchange channel is discharged to the water storage tank from the liquid outlet channel 702, the outlet channel 202 and the water outlet pipe 14 in turn. Preferably, a filtering device is provided in the water storage tank, which can filter the coolant discharged from the cooling channel 4, and the coolant can be recycled, saving the heat dissipation cost of the hub motor.

[0043] In addition, a sealing plate 12 is provided on the side of the faucet plate 6 close to the stator bracket 2, and the inlet channel 201 and the outlet channel 202 are sealed by the sealing plate 12. The water inlet pipe 13 passes through the sealing plate 12 to seal the inlet channel 201, and the water outlet pipe 14 passes through the sealing plate 12 to seal the outlet channel 202 to prevent the coolant from leaking during the circulation process. Preferably, a rubber sealing pad (not shown in the figure) is provided on the inner side of the sealing plate 12 to strengthen the sealing strength between the sealing plate 12 and the stator bracket 2. At the same time, a sealing ring 503 is provided on the side of the cooling channel cover plate 5 close to the stator bracket 2, and the side of the sealing ring 503 fits the side of the cooling channel cover plate 5, further strengthening the sealing of the connection between the cooling channel cover plate 5 and the stator bracket 2, preventing the coolant from leaking from the cooling channel 4, and improving the safety of the hub motor during operation.

[0044] It should be noted that the stator bracket 2 and the cooling channel cover plate 5 are both provided with a matching cross structure 15, and two through holes that are not connected to each other are provided at the position of the matching cross structure 15, one through hole is used to connect the inlet channel 201 and the liquid inlet channel 701, and the other through hole is used to connect the outlet channel 202 and the liquid outlet channel 702. The two matching cross structures 15 cooperate with each other to prevent incorrect installation during the assembly process and speed up the assembly efficiency of the cooling channel cover plate 5 installed on the stator bracket 2. At the same time, it also ensures that the first U-shaped groove 204 and the second U-shaped groove 502 are accurately docked, so that the various parts of the channel are evenly distributed, and the coolant can circulate stably in the cooling channel 4.

[0045] In one embodiment of the present invention, a flat end cover 8 is provided on one side of the stator bracket 2 with a faucet pressure plate 6. The flat end cover 8 is connected to the rim by bolts. The flat end cover 8 protects the internal structure of the hub and improves the safety of the hub during operation.

[0046] In one embodiment of the present invention, an assembly hole is provided at the axis position of the stator bracket 2, and a motor shaft 9 is coaxially provided in the assembly hole. The motor shaft 9 is rotatably connected to the rotor 1, and the motor shaft 9 is fixedly connected to the stator bracket 2, that is, the motor shaft 9 will not rotate relative to the stator bracket 2. After the stator 3 winding drives the rotor 1 to operate, the rotor 1 drives the wheel rim to move, thereby driving the car to move. In addition, bearings 10 are provided at both ends of the motor shaft 9, and the bearings 10 are rotatably connected to the wheel rim. When the rotor 1 drives the wheel rim to move, the bearings 10 can ensure that the wheel rim operates stably on the motor shaft 9.

[0047] In one embodiment of the present invention, a brake end cover 11 is provided on the side of the stator bracket 2 opposite to the flat end cover 8, the brake end cover 11 is connected to the rotor 1 by transmission, and the brake end cover 11 is connected to the bearing 10, and the correct position of the bearing 10 on the motor shaft 9 is limited by the brake end cover 11, so as to prevent the bearing 10 from moving along the axial direction of the motor shaft 9, and further improve the stability of the rim running on the motor shaft 9. On the other hand, the brake end cover 11 can prevent dust and other external substances from entering the inside of the wheel hub motor, keep the internal components of the wheel hub motor clean and lubricated; at the same time, it provides support for the brake system to ensure its stable operation.

[0048] In one embodiment of the present invention, the water inlet pipe 13 and the water outlet pipe 14 are connected to a liquid flow direction conversion device, and the functions of the water inlet pipe 13 and the water outlet pipe 14 are flexibly converted according to the rotation direction of the wheel hub, that is, the flow direction of the coolant in the cooling channel 4 is changed, so that the flow direction of the coolant inside the stator bracket 2 is opposite to the direction in which the stator bracket 2 rotates with the wheel hub, thereby further reducing the resistance of the coolant in the cooling channel 4 and reducing the power demand of the pump.

[0049] When the present invention is used, after the temperature of the coil on the stator 3 rises, the heat is transferred to the stator bracket 2 in the form of heat transfer, the water pump is controlled to suck the coolant in the water tank and transport it to the inlet channel 201, the coolant passes through the inlet channel 201 and the liquid inlet channel 701 in turn into the heat exchange channel, the heat on the stator bracket 2 is transferred to the coolant, the coolant is discharged from the heat exchange channel to the outlet channel 202, and is discharged from the outlet channel 202, the liquid outlet channel 702 and the water outlet pipe 14 to the water tank in turn, and the coolant forms a circulation in the cooling channel 4.

[0050] In summary, the coolant is circulated into the cooling channel 4 through the inlet channel 201, taking away the heat on the stator bracket 2, so that the performance of the hub motor can remain unchanged under continuous use of super power. Moreover, the cooling channel 4 is wavy as a whole and is arranged around the inside of the stator bracket 2, which has a better sealing effect on the coolant and will not leak the coolant. The structure of the cooling channel 4 conforms to fluid mechanics. When the coolant flows in the cooling channel 4, turbulence and vortex will not be formed. The coolant encounters less resistance in the cooling channel 4, which reduces the energy consumption required to drive the coolant to flow, and can reduce the power demand of the pump.

[0051] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0052] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A liquid-cooled hub motor, characterized in that: include: Rim; A rotor, disposed on the inner circumference of the rim, and used to drive the rim to rotate synchronously; A stator bracket is rotatably arranged on the inner peripheral side of the rotor, and a stator is arranged on the outer peripheral side of the stator bracket, and the stator is used to drive the rotor to rotate; The cooling channel is wavy in shape as a whole and is arranged around the inside of the stator bracket. The first end of the cooling channel is provided with an inlet channel for inputting coolant into the cooling channel, and the second end of the cooling channel is provided with an outlet channel for discharging the coolant in the cooling channel.

2. The liquid-cooled hub motor according to claim 1, characterized in that: A plurality of first assembly rods are arranged in an array inside the stator bracket, and two adjacent first assembly rods are combined to form a first U-shaped groove. A cooling channel cover plate is provided on the side of the stator bracket, and a plurality of second assembly rods are arranged in an array on a side of the cooling channel cover plate close to the stator bracket, and two adjacent second assembly rods are combined to form a second U-shaped groove. When the cooling channel cover plate is connected to the stator bracket, each of the first U-shaped grooves is staggeredly connected to a second U-shaped groove to form the cooling channel.

3. The liquid-cooled hub motor according to claim 2, characterized in that: When the cooling channel cover plate is connected to the stator bracket, the first assembly rod and the side surface of the second U-shaped groove do not contact each other, and the second assembly rod and the side surface of the first U-shaped groove do not contact each other.

4. The liquid-cooled hub motor according to claim 1, characterized in that: The stator bracket is provided with an inlet and outlet channel cover plate on one side of the cooling channel cover plate, and the inlet and outlet channel cover plate is used to seal the inlet channel and the outlet channel.

5. The liquid-cooled hub motor according to claim 4, characterized in that: A liquid inlet channel and a liquid outlet channel are arranged on the side of the inlet and outlet channel cover plate, the liquid inlet channel is connected with the cooling channel and the inlet channel, and the liquid outlet channel is connected with the cooling channel and the outlet channel.

6. The liquid-cooled hub motor according to claim 5, characterized in that: A faucet pressure plate is arranged on the side of the stator bracket facing away from the inlet and outlet channel cover plate, and a sealing pressure plate is arranged on the side of the faucet pressure plate close to the stator bracket, the sealing pressure plate is used to seal the inlet channel and the outlet channel, and a water inlet pipe and a water outlet pipe are arranged on the faucet pressure plate, the water inlet pipe is connected to the inlet channel, and the water outlet pipe is connected to the outlet channel.

7. A liquid-cooled hub motor according to any one of claims 1 to 6, characterized in that: A flat end cover is arranged on one side of the stator bracket, and the flat end cover is used to protect the internal structure of the wheel hub.

8. The liquid-cooled hub motor according to claim 7, characterized in that: An assembly hole is arranged at the axis position of the stator bracket, a motor shaft is coaxially arranged in the assembly hole, and the motor shaft is rotatably connected to the rotor.

9. The liquid-cooled hub motor according to claim 8, characterized in that: Bearings are arranged at both ends of the motor shaft, and the bearings are fixedly connected to the stator bracket.

10. The liquid-cooled hub motor according to claim 9, characterized in that: A brake end cover is arranged on a side of the stator support opposite to the flat end cover, and the brake end cover is transmission-connected to the rotor.

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