Cooling medium recovery structure for vertical outer rotor wheel motor

Abstract

The utility model discloses a vertical outer rotor wheel hub motor cooling medium recycling structure, including the inner stator support and outer rotor casing of axle center line horizontal arrangement, be equipped with the flow guide structure in the outer rotor casing, and the one end of outer rotor casing forms cooling medium recycling end, be equipped with the cooling medium recycling cover of annular in the recycling end of outer rotor casing, the one side of recycling cover is close to outer rotor casing and has a flow guide groove, just the flow guide groove is linked together with the inside of outer rotor casing, is used for storing cooling medium, this recycling cover and inner stator support fixed connection, and with outer rotor casing rotation connection. The utility model can make cooling medium gather and store, avoid with outer rotor casing rotation, and cannot quickly, timely discharge, thereby greatly improve the cooling effect of wheel hub motor, guarantee the work efficiency of wheel hub motor.

Description

Technical Field

[0001] This utility model relates to the technical field of hub electric drive systems, and in particular to a cooling medium recovery structure for a vertical external rotor hub motor. Background Technology

[0002] With the rapid development of automotive electrification and intelligence, the application of in-wheel electric drive in the electric vehicle field is becoming increasingly prominent. In-wheel electric drives can be divided into internal rotor motors and external rotor motors based on the rotor position of the motor. Due to the high output torque and limited space of in-wheel electric drives, direct-drive in-wheel drives typically use external rotor motors. This design offers high power density, small motor size, and high output torque. However, because of the limited space in in-wheel motors, and because the main heat source (stator windings) of external rotor motors is internal, their heat dissipation is poor, making them prone to overheating and damage.

[0003] Existing technologies for heat dissipation in external rotor motors typically employ two methods: The first design uses a closed fluid channel between the stator mounting bracket and the mounting shaft, where a cooling medium (such as water or cooling oil) flows to remove heat. However, this design suffers from limited heat exchange area at the channel location, especially in areas with high heat generation where direct contact with the cooling medium significantly reduces its heat dissipation capacity.

[0004] The second method involves enclosing the stator winding assembly entirely with a cover, creating a sealed annular space between the stator assembly's mounting shaft and the cover. The stator assembly is then placed within this annular space. Oil inlets and outlets are then added to the sealed space, allowing cooling oil to circulate and remove heat. This approach increases the air gap between the stator and rotor, significantly impacting motor efficiency and torque output, and presents considerable drawbacks.

[0005] To address the aforementioned issues, the applicant has proposed a direct spraying solution for the stator coils, which can quickly and efficiently cool the interior of the external rotor motor. Simultaneously, a flow guiding structure is installed within the external rotor housing to direct the cooling medium to one end of the housing. However, since the external rotor is constantly rotating, the cooling medium also rotates with the housing, remaining in a constant rotating state. This prevents traditional oil suction devices (such as oil pumps) from directly drawing out the cooling oil, resulting in poor cooling performance and impacting the working efficiency of the hub motor.

[0006] There is an urgent need to provide a solution that can effectively address the above problems. Utility Model Content

[0007] In view of the above-mentioned shortcomings of the existing technology, the purpose of this utility model is to solve the problem that the cooling medium cannot be quickly and timely discharged when it rotates with the outer rotor housing. It provides a cooling medium recovery structure for a vertical outer rotor hub motor, which can collect and store the cooling medium, avoiding the inability to be quickly and timely discharged when it rotates with the outer rotor housing, thereby greatly improving the cooling effect of the hub motor and ensuring the working efficiency of the hub motor.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a vertical external rotor hub motor cooling medium recovery structure, including an inner stator support and an outer rotor housing arranged horizontally along the axis, wherein the outer rotor housing is provided with a flow guiding structure for guiding the cooling medium to one end of the outer rotor housing to form a cooling medium recovery end; characterized in that: an annular cooling medium recovery cover is provided at the recovery end of the outer rotor housing, the recovery cover having a flow guiding groove on the side near the outer rotor housing, and the flow guiding groove communicating with the interior of the outer rotor housing for storing the cooling medium; the recovery cover is fixedly connected to the inner stator support and rotatably connected to the outer rotor housing.

[0009] Furthermore, the inner diameter of the outer ring of the recovery shroud, at least on the side closest to the outer rotor housing, is larger than the inner diameter of the outer rotor housing.

[0010] Furthermore, the outer rotor housing has at least one through hole at the position corresponding to the recovery hood at the recovery end, and the inner cavity of the outer rotor housing is connected to the guide groove of the recovery hood through the through hole.

[0011] Furthermore, the recovery end of the outer rotor housing is an open end, the inner side of the recovery cover is fixedly connected to the inner stator support, and the outer side is rotatably connected to the outer rotor housing, thus closing the recovery end of the outer rotor.

[0012] Furthermore, a storage structure is formed at the bottom of the recycling hood, and the reflux structure is connected to the storage structure.

[0013] Furthermore, the storage structure is a storage tank, which is formed by a downward indentation at the bottom of the recycling hood and is connected to the flow guide channel.

[0014] Furthermore, the storage structure is a storage cavity, which is formed by the inward indentation of the lower part of the side wall of the recycling hood and located in the guide groove; through holes are provided at both ends of the storage cavity corresponding to the guide groove in the circumferential direction, and the storage cavity is connected to the guide groove through the through holes; a cover plate is provided on the outside of the storage cavity, which closes the storage cavity.

[0015] Furthermore, the storage structure is a storage box located at the lower part of the guide channel, with the side wall of the storage box fitting against the inner wall of the recovery cover; through holes are provided at both ends of the storage box along the circumference of the guide channel, and the storage box is connected to the guide channel through the through holes.

[0016] Furthermore, a reflux hole or reflux pipe is provided at the bottom of the recovery hood, with one end of the reflux hole or reflux pipe connected to the storage structure and the other end penetrating through the recovery hood.

[0017] Furthermore, the outer side of the recycling hood is provided with an outer ring, and the open end of the outer rotor housing is provided with an inner ring. The outer ring is sleeved on the inner ring and is rotatably connected to the inner ring.

[0018] Furthermore, a sealing component is provided between the outer ring of the recovery shroud and the rotor housing, or between the outer ring and the inner ring.

[0019] Compared with the prior art, this utility model has the following advantages: The structure of this solution is simple. When the outer rotor rotates, the cooling oil entering the outer rotor housing gathers towards the inner wall of the outer rotor housing under the action of centrifugal force, and then is guided to the recovery hood by the guide structure. Since the recovery hood does not rotate, the cooling oil entering the guide groove of the recovery hood gathers along the guide groove to the lower part of the recovery hood under the action of gravity, realizing the collection of cooling oil during the operation of the hub motor (during the rotation of the outer rotor). In this way, only an oil suction device (such as an oil suction pump) is needed to quickly and timely suck out the cooling oil, thereby effectively cooling the hub motor and ensuring the working efficiency of the hub motor. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] 1—Inner stator support, 2—Outer rotor housing, 3—Flow guiding structure, 4—Recovery cover, 5—Flow guiding groove, 6—Storage cavity, 7—Cover plate, 8—Sealing component. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to represent selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0024] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In addition, the terms "horizontal," "vertical," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] Example: See Figure 1 A cooling medium recovery structure for a vertical external rotor hub motor includes an inner stator support 1 and an outer rotor housing 2 arranged horizontally along the axis. The outer rotor housing 2 has a flow guiding structure 3 for guiding the cooling medium (usually cooling oil) to one end of the outer rotor housing 2 to form a cooling medium recovery end. Specifically, the flow guiding structure 3 is a guide groove, with the depth of the guide groove near the recovery end being greater than the depth of the other end, making the bottom of the guide groove 5 sloped. This facilitates processing and further improves the cooling effect.

[0026] A ring-shaped cooling medium recovery cover 4 is provided at the recovery end of the outer rotor housing 2. The recovery cover 4 has a guide groove 5 on the side near the outer rotor housing 2, making its cross-section C-shaped and having an inner ring and an outer ring; and the guide groove 5 is connected to the interior of the outer rotor housing 2 for storing cooling medium. The recovery cover 4 is fixedly connected to the inner stator support 1 and rotatably connected to the outer rotor housing 2.

[0027] In this embodiment, the recovery end of the outer rotor housing 2 is an open end. The inner side (inner ring) of the recovery cover 4 is fixedly connected to the inner stator support 1, and the outer side (outer ring) is rotatably connected to the outer rotor housing 2, thus closing the recovery end of the outer rotor. This allows the cooling oil inside the outer rotor housing 2 to flow directly and quickly into the recovery cover 4. In practice, the inner diameter of the inner side of the outer ring of the recovery cover 4, at least on the side closest to the outer rotor housing 2, is larger than the inner diameter of the outer rotor housing 2, ensuring that the cooling oil inside the outer rotor housing 2 can enter the recovery cover 4. As an optimization, the inner side of the outer ring of the recovery cover 4 is conical, with its inner diameter on the side closest to the outer rotor housing 2 being larger than the inner diameter on the other side. This allows the cooling oil entering the recovery cover 4 to flow quickly along the inner side of the inner ring of the recovery cover 4 towards the side wall of the recovery cover 4, resulting in a faster flow rate and better recovery effect.

[0028] In the specific implementation process, the outer side of the recovery cover 4 is provided with an outer ring, and the open end of the outer rotor housing 2 is provided with an inner ring. The outer ring is fitted onto the inner ring and is rotatably connected to the inner ring. To achieve rotational sealing of the outer rotor housing 2, a sealing member 8 is provided between the outer side of the outer ring of the recovery cover 4 (the side away from the outer rotor housing 2) and the rotor housing sleeve. This facilitates heat dissipation of the sealing member 8, thereby extending its service life. Alternatively, a sealing member 8 can be provided between the outer ring and the inner ring; providing the sealing member 8 on the inner side provides a better sealing effect. The sealing member 8 is a sealing ring or a sealing bearing, which has a mature structure and good stability. Using this solution, since the cooling oil has both lubricating effect and low temperature rise, it can effectively reduce the wear of the outer ring and the inner ring (as well as the sealing member 8), thereby improving the service life of the entire hub motor. As an optimization, the recovery cover 4 and the inner rotor support are integrally formed, which can effectively improve the overall stability and strength.

[0029] A storage structure is formed at the bottom of the recovery hood 4, and the reflux structure is connected to this storage structure. By setting up the storage structure, the collected cooling oil can be stored and stabilized, facilitating the extraction of the cooling oil by an oil suction device (such as an oil pump) to achieve cooling oil circulation. In this embodiment, the storage structure is a storage cavity 6, which is formed by a recess inward from the lower part of the side wall of the recovery hood 4 and located within the guide groove 5. Through holes are provided at both ends of the storage cavity 6 corresponding to the circumferential direction of the guide groove 5, and these through holes connect to the guide groove 5. A cover plate 7 is provided on the outside of the storage cavity 6, which closes the storage cavity 6. This design allows for a smaller and more compact overall size of the hub motor.

[0030] In implementation, a return hole or return pipe is provided at the lower part of the recovery shroud 4. One end of the return hole or return pipe is connected to the storage structure, and the other end passes through the recovery shroud 4. In this way, the cooling oil can be discharged simply by connecting the oil suction port of the oil suction device to the return hole or return pipe, which is convenient, quick, and more effective. When a return pipe is used, the end of the return pipe away from the storage structure can be extended to any position as needed to facilitate the installation of other components of the hub electric drive system, thereby achieving a compact structure.

[0031] This design has a simple structure. When the outer rotor rotates, the cooling oil entering the outer rotor housing 2 is drawn towards the inner wall of the outer rotor housing 2 under the action of centrifugal force, and then guided by the guide structure 3 to the recovery hood 4. Since the recovery hood 4 does not rotate, the cooling oil entering the guide groove 5 of the recovery hood 4 is drawn along the guide groove 5 to the lower part of the recovery hood 4 under the action of gravity, thus realizing the collection of cooling oil during the operation of the hub motor (during the rotation of the outer rotor). In this way, only an oil suction device (such as an oil suction pump) is needed to quickly and timely suck out the cooling oil, thereby effectively cooling the hub motor and ensuring the working efficiency of the hub motor.

[0032] In Example 2, unlike Example 1, at least one through hole is provided at the position of the recovery hood at the recovery end of the outer rotor housing. The inner cavity of the outer rotor housing is connected to the guide groove of the recovery hood through the through hole. With this solution, the structure of the hub motor does not need to be significantly modified, and the cooling oil in the outer rotor housing can be exported and stored. It is convenient to process and has a lower cost.

[0033] In Example 3, unlike Example 1, the storage structure is a storage tank, which is formed by a downward indentation at the bottom of the recycling hood and is connected to the guide channel; it is easy to process and has good stability.

[0034] Example 4 differs from Example 1 in that the storage structure is a storage box located at the lower part of the guide channel, with the side wall of the storage box fitting against the inner wall of the recovery hood. Through holes are provided at both ends of the storage box along the circumference of the guide channel, and these through holes connect to the guide channel. Using independent storage boxes allows for independent processing of each box, followed by assembly for use, thus facilitating processing and effectively reducing processing costs.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of this utility model that do not depart from the spirit and scope of this technical solution should be covered within the scope of the claims of this utility model.

Claims

1. A cooling medium recovery structure for a vertical external rotor hub motor, comprising an inner stator support and an outer rotor housing arranged horizontally along the axis, wherein the outer rotor housing is provided with a flow guiding structure for guiding the cooling medium to one end of the outer rotor housing to form a cooling medium recovery end; characterized in that: A ring-shaped cooling medium recovery cover is provided at the recovery end of the outer rotor housing. The recovery cover has a guide groove on the side near the outer rotor housing, and the guide groove is connected to the inside of the outer rotor housing for storing cooling medium. The recovery cover is fixedly connected to the inner stator support and rotatably connected to the outer rotor housing.

2. The cooling medium recovery structure for a vertical external rotor hub motor according to claim 1, characterized in that: The inner diameter of the outer ring of the recovery shroud, at least on the side closest to the outer rotor housing, is larger than the inner diameter of the outer rotor housing.

3. The cooling medium recovery structure for a vertical external rotor hub motor according to claim 1, characterized in that: The outer rotor housing has at least one through hole at the position corresponding to the recovery hood at the recovery end, and the inner cavity of the outer rotor housing is connected to the guide groove of the recovery hood through the through hole.

4. The cooling medium recovery structure for a vertical external rotor hub motor according to claim 1, characterized in that: The outer rotor housing has an open end for recycling. The inner side of the recycling cover is fixedly connected to the inner stator support, and the outer side is rotatably connected to the outer rotor housing, thus sealing the recycling end of the outer rotor.

5. The cooling medium recovery structure for a vertical external rotor hub motor according to claim 1, characterized in that: A storage structure is formed at the bottom of the recycling hood, and the reflux structure is connected to the storage structure.

6. The cooling medium recovery structure for a vertical external rotor hub motor according to claim 5, characterized in that: The storage structure is a storage tank, which is formed by a downward indentation at the bottom of the recycling hood and is connected to the flow guide channel.

7. The cooling medium recovery structure for a vertical external rotor hub motor according to claim 5, characterized in that: The storage structure is a storage cavity, which is formed by the inward indentation of the lower side wall of the recycling hood and located in the guide groove; through holes are provided at both ends of the storage cavity corresponding to the guide groove in the circumferential direction, and the storage cavity is connected to the guide groove through the through holes; a cover plate is provided on the outside of the storage cavity, which closes the storage cavity.

8. The cooling medium recovery structure for a vertical external rotor hub motor according to claim 5, characterized in that: The storage structure is a storage box located at the bottom of the guide channel, with the side wall of the storage box fitting against the inner wall of the recovery cover; through holes are provided at both ends of the storage box along the circumference of the guide channel, and the storage box is connected to the guide channel through the through holes.

9. The cooling medium recovery structure for a vertical external rotor hub motor according to claim 5, characterized in that: A reflux hole or reflux pipe is provided at the bottom of the recovery hood. One end of the reflux hole or reflux pipe is connected to the storage structure, and the other end passes through the recovery hood.

10. The cooling medium recovery structure for a vertical external rotor hub motor according to claim 4, characterized in that: The outer side of the recycling hood is provided with an outer ring, and the inner ring is provided at the open end of the outer rotor housing. The outer ring is sleeved on the inner ring and is rotatably connected to the inner ring.

11. The cooling medium recovery structure for a vertical external rotor hub motor according to claim 10, characterized in that: A sealing component is provided between the outer ring of the recovery hood and the rotor housing, or between the outer ring and the inner ring.

Images