Liquid-cooled hub motor and electric vehicle

Abstract

The present invention relates to the technical field of electric vehicles, and specifically discloses a liquid-cooled hub motor and an electric vehicle. The liquid-cooled hub motor includes a first flow guide device, a second flow guide device, and a liquid storage ring groove. The cooling liquid circulation loop formed by the first flow guide device and the second flow guide device enables the cooling liquid to fully cool both sides of the stator located at the top of the accommodating cavity. At the same time, the heat of the stator can be timely transferred to the first side cover and the second side cover to dissipate the heat in time, further improving the heat dissipation effect of the liquid-cooled hub motor. At the same time, the inner diameter of the cooling liquid ring is R, and the outer diameter of the stator of the motor body is r, R≥r. This limitation will not form resistance to the rotation of the liquid-cooled hub motor, effectively solving the problems of poor heat dissipation effect of the liquid-cooled hub motor and the influence of the coolant on the efficiency of the liquid-cooled hub motor in the prior art.

Description

Technical Field

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

[0002] At present, liquid-cooled hub motors are widely used in electric vehicles because of their good heat dissipation effect. However, as users' demand for high-power electric vehicles increases, the liquid-cooled hub motors of high-power electric vehicles in the prior art heat up quickly, especially when the electric vehicle is climbing a large slope. At this time, the motor speed is low and the load is large, which will cause the stator temperature to rise sharply. The temperature cannot be discharged in time, which may cause the risk of burning. At the same time, the presence of coolant will form resistance when the motor rotates, resulting in a decrease in motor efficiency. Therefore, it is necessary to further optimize the structure of the liquid-cooled hub motor to improve the heat dissipation performance of the liquid-cooled hub motor. Summary of the invention

[0003] The purpose of the present invention is to provide a liquid-cooled hub motor and an electric vehicle to solve the problem in the prior art that the presence of coolant will form resistance when the liquid-cooled hub motor rotates, resulting in reduced efficiency of the liquid-cooled hub motor and poor heat dissipation effect of the liquid-cooled hub motor.

[0004] On the one hand, the present invention provides a liquid-cooled hub motor, which includes a motor body and a coolant. The motor body includes a rim body, a first side cover and a second side cover respectively connected to two sides of the rim body, the rim body, the first side cover and the second side cover are arranged to form a receiving cavity, and the coolant is located in the receiving cavity. The liquid-cooled hub motor also includes a first guide device and a second guide device. The first guide device is arranged on the first side cover, and can drive the coolant located on one side of the first side cover to the top of the receiving cavity. The second guide device is arranged on the second side cover, and can drive the coolant located on one side of the second side cover to the top of the receiving cavity. The rim body has a liquid storage ring groove connected to the receiving cavity, and the liquid storage ring groove can accommodate the coolant. Wherein, when the liquid-cooled hub motor is in a high-speed rotating state, the coolant can form a cooling liquid ring in the receiving cavity under the action of centrifugal force, a part of the cooling liquid ring is located in the liquid storage ring groove, the inner diameter of the cooling liquid ring is R, and the outer diameter of the stator of the motor body is r, R≥r.

[0005] As an optional technical solution for liquid-cooled hub motors, in the axial direction of the rim body, the length of the liquid storage ring groove is H, 5mm≤H≤50mm; in the radial direction of the rim body, the length of the liquid storage ring groove is B, 2mm≤B≤30mm.

[0006] As an optional technical solution for the liquid-cooled hub motor, the opening of the liquid storage ring groove faces the first side cover.

[0007] As an optional technical solution for the liquid-cooled hub motor, the liquid-cooled hub motor also includes a fan blade structure arranged in the liquid storage ring groove, and the fan blade structure can bring the cooling liquid at the bottom of the accommodating cavity to the top of the accommodating cavity.

[0008] As an optional technical solution for the liquid-cooled hub motor, the fan blade structure includes a plurality of blades, and the plurality of blades are distributed at intervals along the circumference of the liquid storage ring groove.

[0009] As an optional technical solution for liquid-cooled hub motors, the rim body includes a main body, a first side portion and a second side portion respectively connected to both sides of the main body, the first side portion is connected to the second side cover, the second side portion is connected to the first side cover, and the second side portion has a liquid storage ring groove.

[0010] As an optional technical solution for a liquid-cooled hub motor, a first guide device includes a first guide ring and a plurality of first blades arranged on the first guide ring, the first guide ring is arranged on the first side cover, and the plurality of first blades are rotationally symmetrically arranged along the axial direction of the first side cover, and a second guide device includes a second guide ring and a plurality of second blades arranged on the second guide ring, the second guide ring is arranged on the second side cover, and the plurality of second blades are rotationally symmetrically arranged along the axial direction of the second side cover, the outer diameter of the first guide ring is larger than the outer diameter of the second guide ring, and the first blades and the second blades are staggered in the axial direction of the liquid-cooled hub motor.

[0011] As an optional technical solution for the liquid-cooled hub motor, the first flow guide device also includes a plurality of first skirt lining rings protruding from the first flow guide ring, the plurality of first skirt lining rings are located on the side of the first flow guide ring close to the first side cover, and are bonded with the first side cover to form a plurality of first cooling cavities, the plurality of first cooling cavities are all connected to the accommodating cavity, and the first cooling cavities can accommodate coolant. And / or, the second flow guide device also includes a plurality of second skirt lining rings protruding from the second flow guide ring, the plurality of second skirt lining rings are located on the side of the second flow guide ring close to the second side cover, the plurality of second skirt lining rings, the second side cover, and the second flow guide ring form a plurality of second cooling cavities, the plurality of second cooling cavities are all connected to the accommodating cavity, and the second cooling cavities can accommodate coolant.

[0012] As an optional technical solution for the liquid-cooled hub motor, the first guide device includes a first guide ring and a first positioning member and a first clamping member arranged along the inner circumference of the first guide ring, the first side cover has a first positioning groove and a first clamping groove, the first positioning member is inserted into the first positioning groove, and the first clamping member is clamped into the first clamping groove; and / or, the second guide device includes a second guide ring and a second positioning member and a second clamping member arranged along the inner circumference of the second guide ring, the second side cover has a second positioning groove and a second clamping groove, the second positioning member is inserted into the second positioning groove, and the second clamping member is clamped into the second clamping groove.

[0013] As an optional technical solution for the liquid-cooled hub motor, there are multiple first positioning members, first clamping members, first positioning grooves and first clamping grooves, multiple first positioning members and multiple first positioning grooves are arranged in a one-to-one correspondence, multiple first clamping members and multiple first clamping grooves are arranged in a one-to-one correspondence, multiple first positioning members and multiple first clamping members are arranged at intervals along the inner circumference of the first guide ring, and a first clamping member is provided between two adjacent first positioning members.

[0014] On the other hand, the present invention provides an electric vehicle, comprising an electric vehicle body and the above-mentioned liquid-cooled hub motor, wherein the liquid-cooled hub motor is mounted on the electric vehicle body.

[0015] The beneficial effects of the present invention are:

[0016] The present invention provides a liquid-cooled hub motor, which includes a motor body and a coolant. The motor body includes a rim body, a first side cover and a second side cover respectively connected to both sides of the rim body, the rim body, the first side cover and the second side cover are arranged to form a receiving cavity, and the coolant is located in the receiving cavity. The liquid-cooled hub motor also includes a first flow guide device and a second flow guide device. The first flow guide device can drive the coolant located on one side of the first side cover to the top of the receiving cavity, thereby forming a coolant circulation loop on one side of the first side cover. Similarly, the second flow guide device can drive the coolant located on one side of the second side cover to the top of the receiving cavity, so that a coolant circulation loop can be formed on the second side cover. In this way, under the action of the coolant circulation loop, the coolant can fully cool both sides of the stator located at the top of the receiving cavity, and at the same time, the heat of the stator can also be timely conducted to the first side cover and the second side cover, so that the heat is timely dissipated, and the heat dissipation effect of the liquid-cooled hub motor is further improved. Wherein, a liquid storage ring groove connected to the receiving cavity is arranged on the rim body. With such an arrangement, when the liquid-cooled hub motor rotates at high speed, the coolant will form a cooling liquid ring under the action of centrifugal force, a part of the coolant is distributed in the liquid storage ring groove, and the rest is distributed in the accommodating cavity. At the same time, the inner diameter of the cooling liquid ring is R, and the outer diameter of the stator of the motor body is r, R≥r. With such an arrangement, the coolant will be distributed as a whole around the rotor of the motor body and will not contact the stator of the motor body, thereby not forming resistance to the rotation of the liquid-cooled hub motor, thereby improving the efficiency of the liquid-cooled hub motor, and effectively solving the problems of poor heat dissipation effect of the liquid-cooled hub motor and the influence of the coolant on the efficiency of the liquid-cooled hub motor in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of a liquid-cooled hub motor in a stationary state according to an embodiment of the present invention.

[0018] Figure 2 It is a cross-sectional view of the liquid-cooled hub motor in a rotating state according to an embodiment of the present invention.

[0019] Figure 3 It is a schematic structural diagram of the rim body in an embodiment of the present invention.

[0020] Figure 4 Schematic diagram of the circulation of cooling liquid in the accommodating cavity in an embodiment of the present invention.

[0021] Figure 5 Schematic diagram of the structure of the first flow guide device in an embodiment of the present invention.

[0022] Figure 6 Schematic diagram of the structure of the first flow guide device in another embodiment of the present invention.

[0023] Figure 7 It is a cross-sectional view of the partial structure of the liquid-cooled hub motor in an embodiment of the present invention.

[0024] In the figure:

[0025] 1. Motor body; 11. Rim body; 111. Liquid storage ring groove; 112. Main body; 113. First side; 114. Second side; 12. First side cover; 121. First clamping groove; 13. Second side cover; 14. Accommodating cavity; 2. Coolant; 21. Cooling liquid ring; 3. Fan blade structure; 31. Blade; 4. First guide device; 41. First guide ring; 42. First fan blade; 43. First positioning member; 44. First clamping member; 45. First skirt lining ring; 46. First cooling cavity; 5. Second guide device; 51. Second guide ring; 6. Rotor; 7. Stator; 8. Stator bracket; 9. Motor shaft. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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.

[0027] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] like Figures 1 to 7 As shown, this embodiment provides a liquid-cooled hub motor, which includes a motor body 1 and a coolant 2. The motor body 1 includes a rim body 11, a first side cover 12 and a second side cover 13 respectively connected to two sides of the rim body 11, the rim body 11, the first side cover 12 and the second side cover 13 are arranged to form an accommodating cavity 14, and the coolant 2 is located in the accommodating cavity 14. The liquid-cooled hub motor also includes a motor shaft 9, a stator bracket 8 coaxially sleeved on the motor shaft, and a rotor 6 rotating relative to the stator. The rotor 6 is connected to the rim body 11, and the stator 7 is arranged on the stator bracket 8. The stator bracket 8, the stator 7, and the rotor 6 are all located in the accommodating cavity 14.

[0031] Specifically, the liquid-cooled hub motor further includes a first flow guide device 4 and a second flow guide device 5. The first flow guide device 4 is arranged on the first side cover 12, and its function is to drive the coolant 2 located on one side of the first side cover 12 to the top of the accommodating cavity 14, so as to form a coolant 2 circulation loop on one side of the first side cover 12. Similarly, the second flow guide device 5 is arranged on the second side cover 13, and its function is to drive the coolant 2 located on one side of the second side cover 13 to the top of the accommodating cavity 14, so as to form a coolant 2 circulation loop on the second side cover 13. With such arrangement, under the action of the coolant 2 circulation loop, the coolant 2 can fully cool the two sides of the stator 7 located at the top of the accommodating cavity 14, and at the same time, the heat of the stator 7 can also be timely conducted to the first side cover 12 and the second side cover 13, so as to dissipate the heat in time, and further improve the heat dissipation effect of the liquid-cooled hub motor. Among them, the rim body 11 is provided with a liquid storage ring groove 111 connected with the accommodating cavity 14, and the liquid storage ring groove 111 can accommodate a part of the coolant 2. With such arrangement, when the liquid-cooled hub motor rotates at high speed, the coolant 2 will form a cooling liquid ring 21 under the action of centrifugal force, a part of the coolant 2 is distributed in the liquid storage ring groove 111, and the rest is distributed in the accommodating cavity 14. At the same time, the inner diameter of the cooling liquid ring 21 is R, and the outer diameter of the stator 7 of the motor body is r, R≥r. With such arrangement, the coolant 2 will be distributed as a whole around the rotor 6 of the motor body and will not contact the stator 7 of the motor body, so it will not form resistance to the rotation of the liquid-cooled hub motor, thereby improving the efficiency of the liquid-cooled hub motor, and effectively solving the problems of poor heat dissipation effect of the liquid-cooled hub motor and the influence of the coolant on the efficiency of the liquid-cooled hub motor in the prior art.

[0032] It should be noted that the high-speed rotation of the liquid-cooled hub motor means that the speed of the electric vehicle is greater than or equal to 20km / h.

[0033] The motor body 1 may be, but is not limited to, a cam motor with an outer rotor or a common outer rotor motor. Preferably, in this embodiment, the motor body 1 is a cam motor, because the rotor of the cam motor is thicker, so the capacity of the coolant 2 can be increased.

[0034] Specifically, in the axial direction of the rim body 11, the length of the liquid storage annular groove 111 is H, 5mm≤H≤50mm; and in the radial direction of the rim body 11, the length of the liquid storage annular groove 111 is B, 2mm≤B≤30mm. The size of the liquid storage annular groove 111 is set in this way to ensure that the liquid storage annular groove 111 can accommodate a part of the coolant 2, so that the coolant 2 can fully cool the stator 7 and will not form resistance to the rotation of the liquid-cooled hub motor. Among them, according to the size setting requirements of the rim body 11 of the electric vehicle, the length H of the liquid storage groove 111 can be selected from 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, etc.; correspondingly, the length B of the liquid storage groove 111 can be selected from 2mm, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, etc., and the above values ​​can all achieve the purpose of accommodating a part of the coolant 2, so that the cooling liquid ring 21 can be distributed around the rotor 6 without contacting the stator 7, and at this time there is no resistance to the high-speed operation of the motor, because when the motor runs at high speed, the heat is very small, and a stable temperature rise thermal balance can be maintained without special heat dissipation.

[0035] In this embodiment, the opening of the liquid storage ring groove 111 faces the first side cover 12. With this arrangement, when the liquid-cooled hub motor rotates at a high speed, the coolant 2 is easy to form a complete cooling liquid ring 21 through the action of centrifugal force, which is convenient for cooling the stator 7; at the same time, the temperature of the stator 7 received by the coolant 2 can be timely transmitted to the first side cover 12, so as to quickly dissipate heat.

[0036] When the liquid-cooled hub motor rotates at high speed, in order to quickly drive the coolant 2 at the bottom of the accommodating cavity 14, the liquid-cooled hub motor includes a fan blade structure 3 arranged in the liquid storage ring groove 111. The fan blade structure 3 can bring the coolant 2 at the bottom of the accommodating cavity 14 to the top of the accommodating cavity 14, so that the coolant 2 can dissipate heat to the stator 7 of the motor body 1 at the top of the accommodating cavity 14. Among them, the fan blade structure 3 can also strengthen the structural strength of the rim body 11 to avoid deformation of the rim body 11 caused by the impact of bumpy roads during actual riding.

[0037] Optionally, the fan blade structure 3 and the rim body 11 are an integrated structure for easy processing.

[0038] Optionally, the rim body 11 and the first side cover 12 and the second side cover 13 are all made of die-cast aluminum alloy, which is not only suitable for batch die-casting, but also has controllable weight, which is more advantageous for electric vehicles with weight requirements.

[0039] Specifically, the side wall of the fan blade structure 3 facing the accommodating cavity 14 is an arc-shaped side wall. By providing the arc-shaped side wall, when the coolant 2 at the bottom of the accommodating cavity 14 is driven, it can play a buffering role to prevent the coolant 2 from splashing.

[0040] The fan blade structure 3 includes a plurality of blades 31, and the plurality of blades 31 are distributed at intervals along the circumference of the liquid storage ring groove 111. Such an arrangement can further increase the efficiency of the fan blade structure 3 in driving the coolant 2 at the bottom of the accommodating cavity 14, thereby improving the heat dissipation effect of the liquid-cooled hub motor.

[0041] In this embodiment, the rim body 11 includes a main body 112, a first side portion 113 and a second side portion 114 respectively connected to both sides of the main body 112, the first side portion 113 is connected to the second side cover 13 through a fastener, the second side portion 114 is connected to the first side cover 12 through a fastener, and a liquid storage ring groove 111 is provided on the second side portion 114. This arrangement makes the structure more compact while meeting the structural strength of the rim body 11.

[0042] Specifically, the first guide device 4 includes a first guide ring 41 and a plurality of first blades 42 arranged on the first guide ring 41, the first guide ring 41 is arranged on the first side cover 12, and the plurality of first blades 42 are rotationally symmetrically arranged along the axial direction of the first side cover 12; similarly, the second guide device 5 includes a second guide ring 51 and a plurality of second blades arranged on the second guide ring 51, the second guide ring 51 is arranged on the second side cover 13, and the plurality of second blades are rotationally symmetrically arranged along the axial direction of the second side cover 13; in this embodiment, the outer diameter of the first guide ring 41 is set to be larger than the outer diameter of the second guide ring 51, and the first blades 42 and the second blades are arranged at a certain angle. The liquid-cooled hub motor is staggered in the axial direction. The advantage of this arrangement is that the first fan blade 42 can be used to drive the coolant at the bottom of the accommodating cavity 14 to the top of the accommodating cavity 14, and the second fan blade can be used to drive the coolant at the bottom of the accommodating cavity 14 to the top of the accommodating cavity 14. At the same time, when the liquid-cooled hub motor rotates, the coolant 2 on both sides of the first side cover 12 and the second side cover 13 can form convection, which promotes the coolant 2 at the bottom of the accommodating cavity 14 to flow, and then forms a coolant 2 circulation at the bottom of the accommodating cavity 14, so that the heat of the stator 7 can be fully transferred to the first side cover 12 and the second side cover 13 by the coolant 2, thereby improving the heat dissipation effect.

[0043] In this embodiment, the first guide device 4 includes a first guide ring 41 and a first positioning member 43 and a first clamping member 44 arranged along the inner circumference of the first guide ring 41. The first side cover 12 has a first positioning groove and a first clamping groove 121. The first positioning member 43 can be inserted into the first positioning groove, and the first clamping member 44 and the first clamping groove 121 are clamped. In this way, the installation between the first guide device 4 and the first side cover 12 is completed. This installation method is convenient and quick.

[0044] Alternatively, the second guide device 5 includes a second guide ring 51 and a second positioning member and a second clamping member arranged along the inner circumference of the second guide ring 51, and the second side cover 13 has a second positioning groove and a second clamping groove. Similarly, the second positioning member can also be inserted into the second positioning groove, and the second clamping member and the second clamping groove are clamped, thereby completing the installation between the second guide device 5 and the second side cover 13.

[0045] Specifically, in order to enhance the stability and reliability of the installation between the first flow guide device 4 and the first side cover 12, in this embodiment, the first positioning member 43, the first clamping member 44, the first positioning groove and the first clamping groove 121 are all multiple, the multiple first positioning members 43 and the multiple first positioning grooves are arranged one by one, the multiple first clamping members 44 and the multiple first clamping grooves 121 are arranged one by one, and one first clamping member 44 is arranged between two adjacent first positioning members 43. This arrangement can further enhance the connection strength between the first flow guide device 4 and the first side cover 12.

[0046] The first positioning member 43 is a protruding block extending radially along the first guide ring 41 , and the second positioning member is a protruding block extending radially along the second guide ring 51 ; the first clamping member 44 and the second clamping member are both hook structures, which are convenient for installation and disassembly.

[0047] In this embodiment, the first guide device 4 also includes a plurality of first skirt lining rings 45 protruding from the first guide ring 41. The plurality of first skirt lining rings 45 can be attached to the first side cover 12 to form a plurality of closed first cooling chambers 46. Since the plurality of first cooling chambers 46 are connected to the accommodating chamber 14, the coolant 2 contained in the first cooling chamber 46 will flow into the accommodating chamber 14 when the liquid-cooled hub motor rotates to a certain angle, so as to cool the stator 7. At the same time, the heat of the stator 7 can be timely conducted to the first side cover 12 and the second side cover 13, thereby improving the heat dissipation effect of the liquid-cooled hub motor.

[0048] Alternatively, the first cooling cavity 46 may not be in contact with the first side cover 12, so that when the liquid-cooled hub motor rotates to a certain angle, the coolant 2 contained in the first cooling cavity 46 can flow out in two directions of the first side cover 12 and the containing cavity 14, so that the coolant 2 can circulate quickly, thereby improving the heat dissipation effect.

[0049] Similarly, the second guide device 5 also includes a plurality of second skirt linings protruding from the second guide ring 51. The plurality of second skirt linings can be bonded with the second side cover 13 to form a plurality of closed second cooling cavities, or not bonded with the second side cover 13. Both of these two settings can improve the heat dissipation effect of the liquid-cooled hub motor.

[0050] Optionally, the first blade 42 and the first skirt lining ring 45 are respectively located on both sides of the first guide ring 41, and the first blade 42 is located on the side facing the accommodating cavity 14, so as to quickly guide the coolant 2 at the bottom of the accommodating cavity 14 to the top of the accommodating cavity 14.

[0051] Optionally, the first flow guide device 4 further includes a plurality of flow guide holes arranged on the first flow guide ring 41 and a plurality of flow guide plates corresponding to the plurality of flow guide holes one by one. The setting of the flow guide holes can connect the first cooling cavity 46 with the accommodating cavity 14. The plurality of flow guide holes and the plurality of first cooling cavities 46 are arranged one by one. The setting of the flow guide plates can quickly guide the coolant 2 at the bottom of the liquid-cooled hub motor into the accommodating cavity 14 to ensure that the accommodating cavity 14 contains sufficient coolant 2, thereby improving the cooling efficiency of the liquid-cooled hub motor. Specifically, the cross section of the flow guide plate is L-shaped.

[0052] Optionally, the first skirt liner 45 includes a beveled skirt connected to the hole wall of the guide hole, and the beveled skirt is arranged on the side of the first guide ring 41 close to the axial direction. When the liquid-cooled hub motor rotates, the beveled skirt can drive the coolant 2 in the accommodating cavity 14 to rotate. When it reaches a certain height, the coolant 2 in the accommodating cavity 14 will flow out obliquely downward along the beveled skirt and spray onto the stator 7 and other parts in a radiating surface, thereby improving the cooling effect of the liquid-cooled hub motor; in this way, the spraying height of the coolant 2 can basically cover the stator 7 of the liquid-cooled hub motor, further increasing the cooling area.

[0053] In an embodiment not shown in the figure, the first guide device 4 also includes a plurality of reinforcing ribs spaced apart on the outer periphery of the first guide ring 41. The arrangement of the reinforcing ribs increases the strength and rigidity of the first guide ring 41 without increasing the thickness of the first guide ring 41, thereby avoiding deformation of the first guide ring 41, saving material consumption, reducing weight, lowering costs, and increasing the service life of the first guide device 4.

[0054] Optionally, the first flow guide device 4 and the second flow guide device 5 are made of plastic material. The first flow guide device 4 and the second flow guide device 5 made of plastic are light in weight and small in rotational inertia, and have little influence on the rotation of the liquid-cooled hub motor.

[0055] Preferably, the structure of the second flow guide device 5 is integrally formed with the first flow guide device 4. The molding process of the structure of the second flow guide device 5 and the first flow guide device 4 can effectively reduce the number of parts, and the molding process has high production efficiency, simple operation and low production cost.

[0056] The structure of the second flow guiding device 5 is the same as that of the first flow guiding device 4 .

[0057] This embodiment also provides an electric vehicle, including an electric vehicle body and the above-mentioned liquid-cooled hub motor, which is installed on the electric vehicle body. A first flow guide device 4 is provided to form a cooling liquid 2 circulation loop on one side of the first side cover 12. Similarly, a second flow guide device 5 is provided on the second side cover 13 to form a cooling liquid 2 circulation loop on the second side cover 13. Under the action of the cooling liquid 2 circulation loop, the cooling liquid 2 can fully cool the two sides of the stator 7 located at the top of the accommodating cavity 14. At the same time, the heat of the stator 7 can also be timely conducted to the first side cover 12 and the second side cover 13, so that the heat is timely dissipated, further improving the heat dissipation effect of the liquid-cooled hub motor. Among them, when the electric vehicle rotates at high speed, the coolant 2 will form a cooling liquid ring 21 under the action of centrifugal force, a part of the coolant 2 is distributed in the liquid storage ring groove 111, and the rest is distributed in the accommodating cavity 14. At the same time, the inner diameter of the cooling liquid ring 21 is R, and the outer diameter of the stator 7 of the motor body is r, R≥r. In this way, the coolant 2 will not be distributed as a whole around the stator 7 of the motor body, so as not to form resistance to the rotation of the liquid-cooled hub motor, thereby improving the efficiency of the electric vehicle, and effectively solving the problems of poor heat dissipation effect of electric vehicles and the influence of coolant on the efficiency of electric vehicles in the prior art.

[0058] The advantages of the present invention are as follows:

[0059] like Figure 2 and Figure 4 As shown, when the liquid-cooled hub motor is at low speed and high load, the liquid surface of the coolant 2 of the liquid-cooled hub motor is easily concentrated at the bottom of the liquid-cooled hub motor under the action of gravity, so the bottom heat conduction is good, but the heat dissipation effect of the upper part of the liquid-cooled hub motor is poor and the heat is unbalanced, resulting in unsatisfactory heat dissipation effect. To ensure sufficient heat conduction between the coolant 2 and the stator 7, the first side cover 12 and the second side cover 13, the liquid-cooled hub motor of the present invention guides the path of the internal coolant. The fluid circulation path is mainly divided into three parts: annular flow on the side of the first side cover 12, annular flow on the side of the second side cover 13, and exchange flow at the bottom of the liquid-cooled hub motor. Among them, the first side cover 12 has an annular flow: the coolant 2 is driven by the first blade 42 to transport the coolant 2 from the bottom of the accommodating chamber 14 upward, completing the circulation flow of the coolant 2 from the bottom of the accommodating chamber 14 to the top of the accommodating chamber 14; the second side cover 13 has an annular flow: the coolant 2 is driven by the second blade to transport the coolant 2 from the bottom of the accommodating chamber 14 upward, completing the circulation flow of the coolant 2 from the bottom of the accommodating chamber 14 to the top of the accommodating chamber 14; the bottom exchange flow of the liquid-cooled hub motor: since the present scheme provides a first guide ring and a second guide ring of different sizes, and the first blade 42 and the second blade are staggered in the axial direction of the liquid-cooled hub motor, when the liquid-cooled hub motor rotates, the coolant 2 can form convection to complete the function of the bottom exchange flow of the liquid-cooled hub motor.

[0060] After the above three liquid circulation processes, the heat of the stator 7 can be fully transferred to the first side cover 12 and the second side cover 13 by the coolant 2, thereby improving the heat dissipation effect.

[0061] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A liquid-cooled hub motor, comprising a motor body (1) and a coolant (2), wherein the motor body (1) comprises a rim body (11), a first side cover (12) and a second side cover (13) respectively connected to two sides of the rim body (11), the rim body (11), the first side cover (12) and the second side cover (13) are arranged to form a receiving cavity (14), and the coolant (2) is located in the receiving cavity (14), characterized in that: The liquid-cooled hub motor further comprises a first flow guide device (4) and a second flow guide device (5), wherein the first flow guide device (4) is arranged on the first side cover (12) and is capable of driving the coolant (2) located on one side of the first side cover (12) to the top of the accommodating cavity (14), and the second flow guide device (5) is arranged on the second side cover (13) and is capable of driving the coolant (2) located on one side of the second side cover (13) to the top of the accommodating cavity (14); The rim body (11) has a liquid storage annular groove (111) in communication with the accommodating cavity (14), and the liquid storage annular groove (111) is capable of accommodating the coolant (2); Wherein, when the liquid-cooled hub motor is in a high-speed rotating state, the coolant (2) can form a cooling liquid ring (21) in the accommodating cavity (14) under the action of centrifugal force, a portion of the cooling liquid ring (21) is located in the liquid storage ring groove (111), the inner diameter of the cooling liquid ring (21) is R, the outer diameter of the stator (7) of the motor body (1) is r, and R ≥ r; The first flow guide device (4) comprises a first flow guide ring (41) and a plurality of first blades (42) arranged on the first flow guide ring (41); the first flow guide ring (41) is arranged on the first side cover (12); the plurality of first blades (42) are arranged rotationally symmetrically along the axis direction of the first side cover (12); the second flow guide device (5) comprises a second flow guide ring (51) and a plurality of second blades arranged on the second flow guide ring (51); the second flow guide ring (51) is arranged on the second side cover (13); the plurality of second blades are arranged rotationally symmetrically along the axis direction of the second side cover (13).

2. The liquid-cooled hub motor according to claim 1, characterized in that: In the axial direction of the rim body (11), the length of the liquid storage annular groove (111) is H, 5mm≤H≤50mm; in the radial direction of the rim body (11), the length of the liquid storage annular groove (111) is B, 2mm≤B≤30mm.

3. The liquid-cooled hub motor according to claim 1, characterized in that: The opening of the liquid storage annular groove (111) faces the first side cover (12).

4. The liquid-cooled hub motor according to claim 1, characterized in that: The liquid-cooled hub motor further comprises a fan blade structure (3) arranged in the liquid storage ring groove (111), wherein the fan blade structure (3) is capable of driving the coolant (2) located at the bottom of the accommodating cavity (14) to the top of the accommodating cavity (14).

5. The liquid-cooled hub motor according to claim 4, characterized in that: The fan blade structure (3) comprises a plurality of blades (31), and the plurality of blades (31) are distributed at intervals along the circumference of the liquid storage annular groove (111).

6. The liquid-cooled hub motor according to claim 1, characterized in that: The wheel rim body (11) comprises a main body (112), a first side portion (113) and a second side portion (114) respectively connected to two sides of the main body (112); the first side portion (113) is connected to the second side cover (13); the second side portion (114) is connected to the first side cover (12); and the second side portion (114) has the liquid storage annular groove (111).

7. The liquid-cooled hub motor according to any one of claims 1 to 6, characterized in that: The outer diameter of the first guide ring (41) is greater than the outer diameter of the second guide ring (51), and the first fan blade (42) and the second fan blade are staggered in the axial direction of the liquid-cooled hub motor.

8. The liquid-cooled hub motor according to claim 7, characterized in that: The first flow guide device (4) further comprises a plurality of first skirt lining rings (45) protruding from the first flow guide ring (41), the plurality of first skirt lining rings (45) being located on a side of the first flow guide ring (41) close to the first side cover (12), the plurality of first skirt lining rings (45) forming a plurality of first cooling chambers (46) with the first side cover (12) and the first flow guide ring (41), the plurality of first cooling chambers (46) being in communication with the accommodating chamber (14), and the first cooling chambers (46) being capable of accommodating the coolant (2); and / or the second flow guide device (5) further comprises a plurality of second skirt lining rings protruding from the second flow guide ring (51), the plurality of second skirt lining rings being located on a side of the second flow guide ring (51) close to the second side cover (13), the plurality of second skirt lining rings forming a plurality of second cooling chambers with the second side cover (13) and the second flow guide ring (51), the plurality of second cooling chambers being in communication with the accommodating chamber (14), and the second cooling chambers being capable of accommodating the coolant (2).

9. The liquid-cooled hub motor according to any one of claims 1 to 6, characterized in that: The first flow guide device (4) comprises a first flow guide ring (41) and a first positioning member (43) and a first clamping member (44) arranged along the inner circumference of the first flow guide ring (41); the first side cover (12) has a first positioning groove and a first clamping groove (121); the first positioning member (43) is inserted into the first positioning groove; the first clamping member (44) and the first clamping groove (121) are clamped; and / or the second flow guide device (5) comprises a second flow guide ring (51) and a second positioning member and a second clamping member arranged along the inner circumference of the second flow guide ring (51); the second side cover (13) has a second positioning groove and a second clamping groove; the second positioning member is inserted into the second positioning groove; the second clamping member and the second clamping groove are clamped.

10. The liquid-cooled hub motor according to claim 9, characterized in that: There are multiple first positioning members (43), multiple first clamping members (44), multiple first positioning grooves and multiple first clamping grooves (121); multiple first positioning members (43) and multiple first positioning grooves are arranged in a one-to-one correspondence; multiple first clamping members (44) and multiple first clamping grooves (121) are arranged in a one-to-one correspondence; multiple first positioning members (43) and multiple first clamping members (44) are arranged at intervals along the inner periphery of the first guide ring (41); and one first clamping member (44) is provided between two adjacent first positioning members (43).

11. An electric vehicle, characterized in that: It comprises an electric vehicle body and the liquid-cooled hub motor according to any one of claims 1 to 10, wherein the liquid-cooled hub motor is mounted on the electric vehicle body.

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