Roller motor

Abstract

The invention is suitable for the technical field of motors, and provides a roller motor which comprises a shell, a passive heat dissipation piece, a driving assembly and an air supply structure, the shell is provided with an inner cavity, the passive heat dissipation piece and the driving assembly are both installed in the inner cavity, and the passive heat dissipation piece makes contact with the inner wall of the shell; the end, away from the passive heat dissipation piece, of the driving assembly is provided with a containing cavity, the air supply structure is installed in the containing cavity, the side, close to the driving assembly, of the air supply structure is provided with an air supply opening, and the driving assembly is further provided with an air channel communicating with the containing cavity and the inner cavity and located between the air supply structure and the passive heat dissipation piece. According to the roller motor provided by the invention, heat transfer is accelerated by arranging the air supply structure, and the speed of dissipating heat to the outside through the shell is accelerated by arranging the passive heat dissipation piece, so that the heat dissipation efficiency and the heat dissipation effect are effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and more specifically, to a drum motor. Background Art

[0002] Drum motor is a motor device used to drive the drum. It has the characteristics of large torque and low noise, and is widely used in logistics, mining, production and processing, etc. With the continuous development of science and technology, the performance requirements of drum motors are getting higher and higher, among which heat dissipation is the key factor restricting the improvement of drum motor performance.

[0003] However, the common drum motors on the market currently usually use natural cooling to dissipate heat. However, since the temperature of the drum motor continues to rise when it is working, the heat dissipation efficiency is low and the heat dissipation effect is poor if it only relies on natural cooling of the drum. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a drum motor, aiming to solve the technical problems of low heat dissipation efficiency and poor heat dissipation effect of the drum motor in the prior art.

[0005] To achieve the above-mentioned purpose, the technical solution adopted in the present application is: to provide a drum motor, including a shell, a passive heat sink, a driving assembly and an air supply structure, the shell having an inner cavity, the passive heat sink and the driving assembly are both installed in the inner cavity, and the passive heat sink is in contact with the inner wall of the shell; an accommodating cavity is provided at one end of the driving assembly away from the passive heat sink, the air supply structure is installed in the accommodating cavity, an air supply port is provided on the side of the air supply structure close to the driving assembly, and the driving assembly is also provided with an air duct connecting the accommodating cavity and the inner cavity, and the air duct is located between the air supply structure and the passive heat sink.

[0006] In a possible design, the passive heat sink includes a first cylinder, and the first cylinder and the driving assembly are arranged in sequence along the axial direction of the first cylinder; the outer surface of the first cylinder is in contact with the inner wall of the outer shell, and the side of the first cylinder facing away from the driving assembly is spaced from the side wall of the inner cavity; a groove is formed on the outer surface of the first cylinder, and the groove penetrates the first cylinder along the axial direction of the first cylinder; an air inlet and an air outlet connected to the air duct are formed on the side of the driving assembly close to the passive heat sink, and one of the air inlet and the air outlet is opposite to the groove, and the other is opposite to the inner hole of the first cylinder.

[0007] In a possible design, the passive heat dissipation element also includes a second cylinder coaxially arranged with the first cylinder, and the second cylinder is located in the inner hole of the first cylinder; the outer diameter of the second cylinder is smaller than the inner diameter of the first cylinder, and a connecting portion is arranged between the first cylinder and the second cylinder, and the connecting portion is respectively connected to the first cylinder and the second cylinder.

[0008] In a possible design, the inner surface of the first cylinder has a connection area, the connection area is opposite to the area on the outer surface of the first cylinder where the groove is formed, and the connection area is connected to the connection portion.

[0009] In a possible design, the air outlet is opposite to the groove, and the air inlet is opposite to the gap between the first cylinder and the second cylinder.

[0010] In a possible design, the number of the air outlets and the number of the air inlets are both multiple, and the number of the grooves is also multiple. The multiple grooves are arranged at intervals around the axial direction of the first cylinder, and the multiple grooves are arranged in a one-to-one correspondence with the multiple air outlets, and the multiple air inlets are all opposite to the gap between the first cylinder and the second cylinder.

[0011] In a possible design, a plurality of heat sinks are disposed on the inner surface of the first cylinder, and the length direction of the heat sinks is parallel to or arranged at an acute angle to the axial direction of the first cylinder.

[0012] In a possible design, the drive assembly includes a drive structure, a transmission structure and a tensioning structure, the transmission structure is arranged between the drive structure and the tensioning structure, the drive structure is transmission-connected to the tensioning structure via the transmission structure, and the tensioning structure is fixedly connected to the outer shell; the passive heat sink is installed on a side of the tensioning structure away from the transmission structure, and the accommodating cavity is arranged at an end of the drive structure away from the transmission structure.

[0013] In a possible design, the tensioning structure divides the inner cavity into a first chamber and a second chamber, and the tensioning structure is provided with a first connecting channel connecting the first chamber and the second chamber; the driving structure includes a driving member and an inner shell, the inner shell is installed in the first chamber and is spaced apart from the side wall of the first chamber, the inner shell has the accommodating cavity, and the side wall of the inner shell is penetrated by a through hole, the driving member and the air supply structure are both installed in the accommodating cavity, and the air supply structure is located on the side of the driving member away from the transmission structure, and at least part of the structure of the transmission structure extends into the accommodating cavity and is connected to the driving member.

[0014] In a possible design, the driving member is provided with a second communication passage extending from a side close to the air supply structure to a side close to the transmission structure, and the through hole is provided in an area on the side wall of the accommodating cavity opposite to the driving member and the transmission structure; and / or,

[0015] A mounting member is also installed in the accommodating cavity. The mounting member is located on a side of the air supply structure away from the driving member. The air supply structure is installed on the mounting member. The mounting member is penetrated by at least one through hole respectively connected to the accommodating cavity and the inner cavity.

[0016] The beneficial effect of the drum motor provided by the present application is that compared with the prior art, the drum motor of the present application, by setting a passive heat sink and an air supply structure, the air supply structure is located at the end of the driving component away from the passive heat sink, and an air supply port is provided on the side of the air supply structure close to the driving component, so that the air supply structure can drive the air to flow to the side close to the driving component, and the air flow flows through the air duct in the driving component to the passive heat sink, so that the heat in the driving component is transferred to the passive heat sink through the air flow, and finally the heat is transferred to the outer casing through the passive heat sink, so that the heat is dissipated to the outside through the outer casing.

[0017] In summary, the drum motor provided in the present application accelerates the transfer of heat by providing an air supply structure, and accelerates the speed at which heat is dissipated to the outside through the outer casing by providing a passive heat dissipation component, thereby effectively improving the heat dissipation efficiency and improving the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 is a schematic structural diagram of a drum motor provided by an embodiment of the present application from one perspective;

[0020] Figure 2 This is a partial structural schematic diagram of a drum motor provided by an embodiment of the present application after the outer shell is hidden;

[0021] Figure 3 yes Figure 2 A local enlarged schematic diagram of the middle A;

[0022] Figure 4 is a schematic structural diagram of a passive heat sink in a drum motor provided by an embodiment of the present application;

[0023] Figure 5 yes Figure 1 A schematic cross-sectional view of the drum motor along the BB direction;

[0024] Figure 6 yes Figure 5 Schematic diagram of the rotation section of the drum motor along the CC direction;

[0025] Figure 7 yes Figure 6 A partial enlarged schematic diagram of point D in the middle;

[0026] Figure 8 yes Figure 6 A partial enlarged schematic diagram of point E in the middle;

[0027] Fig. 9 It is a partial structural schematic diagram of a drum motor provided in one embodiment of the present application.

[0028] The reference numerals in the above drawings are as follows:

[0029] 100, outer shell; 110, inner cavity; 111, first chamber; 112, second chamber;

[0030] 210, fixed structure; 220, supporting structure;

[0031] 300, air supply structure; 310, fixing frame; 311, connecting column; 320, mounting member; 321, through hole;

[0032] 400, driving assembly; 401, air inlet; 402, air outlet; 410, tensioning structure; 411, first communication channel; 420, transmission structure; 421, speed reducer; 422, output shaft; 430, driving structure; 431, driving member; 4311, second communication channel; 432, inner shell; 4321, accommodating chamber; 4322, through hole;

[0033] 500, passive heat dissipation element; 501, first air flow channel; 502, second air flow channel; 510, first cylinder; 511, groove; 520, second cylinder; 530, connecting part; 540, heat sink. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0036] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the structure or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0038] In order to illustrate the technical solution described in this application, a detailed description is given below in conjunction with specific drawings and embodiments.

[0039] like Figures 1 to 6 As shown, the drum motor provided in this embodiment includes a shell 100, a passive heat sink 500, a driving assembly 400 and an air supply structure 300, the shell 100 has an inner cavity 110, the passive heat sink 500 and the driving assembly 400 are both installed in the inner cavity 110, and the passive heat sink 500 is in contact with the inner wall of the shell 100; an accommodating cavity 4321 is provided at one end of the driving assembly 400 away from the passive heat sink 500, the air supply structure 300 is installed in the accommodating cavity 4321, and an air supply port is provided on the side of the air supply structure 300 close to the driving assembly 400, and the driving assembly 400 is also provided with an air duct connecting the accommodating cavity 4321 and the inner cavity 110, and the air duct is located between the air supply structure 300 and the passive heat sink 500.

[0040] In the embodiment of the present application, the driving assembly 400 is connected to the housing 100, and the driving assembly 400 is used to drive the housing 100 to rotate around the rotation axis. Optionally, the housing 100 may be a cylindrical structure, and the axis of the housing 100 is the rotation axis. For ease of description, the following description is based on the example of the housing 100 being a cylindrical structure.

[0041] Compared with the related art, the drum motor of the embodiment of the present application is provided with a passive heat sink 500 and an air supply structure 300. The air supply structure 300 is located at one end of the driving component 400 away from the passive heat sink 500, and an air supply port is provided on the side of the air supply structure 300 close to the driving component 400, so that the air supply structure 300 can drive the air to flow to the side close to the driving component 400, and the air flow flows through the air duct in the driving component 400 to the passive heat sink 500, so as to transfer the heat in the driving component 400 to the passive heat sink 500 through the air flow, and finally transfer the heat to the outer casing 100 through the passive heat sink 500, so as to dissipate the heat to the outside through the outer casing 100.

[0042] In summary, the drum motor provided in the embodiment of the present application accelerates the transfer of heat by providing an air supply structure 300, and accelerates the speed at which heat is dissipated to the outside through the outer casing 100 by providing a passive heat sink 500, thereby effectively improving the heat dissipation efficiency and the heat dissipation effect.

[0043] In one possible design, see Figures 4 to 7 The passive heat sink 500 includes a first barrel 510, and the first barrel 510 and the driving assembly 400 are sequentially arranged along the axial direction of the first barrel 510. The outer surface of the first barrel 510 contacts the inner wall of the housing 100, and the side of the first barrel 510 facing away from the driving assembly 400 is spaced from the side wall of the inner cavity 110. A groove 511 is formed on the outer surface of the first barrel 510, and the groove 511 penetrates the first barrel 510 along the axial direction of the first barrel 510. An air inlet 401 and an air outlet 402 connected to the air duct are formed on one side of the driving assembly 400 close to the passive heat sink 500, and one of the air inlet 401 and the air outlet 402 is opposite to the groove 511, and the other is opposite to the inner hole of the first barrel 510. It is worth noting that the air inlet 401 is used to supply air flow into the air duct from the side of the driving component 400 close to the passive heat sink 500, and the air outlet 402 is used to supply air flow out of the air duct from the side of the driving component 400 close to the passive heat sink 500.

[0044] In this setting method, the side wall of the groove 511 and the inner wall of the housing 100 enclose to form a first air flow channel 501, and the inner hole of the first cylinder 510 is a second air flow channel 502. One of the first air flow channel 501 and the second air flow channel 502 serves as the air inlet channel of the passive heat sink 500, and the other serves as the air outlet channel of the passive heat sink 500. When the air supply structure 300 works, it drives the air flow in the accommodation cavity 4321 to pass through the air inlet channel of the passive heat sink 500 that sequentially passes through the air duct and the air outlet 402, so as to transfer the heat in the air flow to the housing 100 through the passive heat sink 500, and finally dissipate it to the outside through the housing 100; when the air flow passes through the air inlet channel and enters the area in the inner cavity 110 on the side of the passive heat sink 500 away from the driving assembly 400, then the air flow flows into the air outlet channel of the passive heat sink 500, so as to transfer the remaining part of the heat in the air flow to the housing 100 through the passive heat sink 500 again. After that, the air flow passes through the air outlet channel of the passive heat sink 500 and enters the air duct of the driving assembly 400 through the air inlet 401 of the driving assembly 400. Such a setting is convenient to form an air circulation flow in the inner cavity 110 and improve the heat dissipation effect.

[0045] In some embodiments, the driving assembly 400 may be provided with only one air duct, and both the air inlet 401 and the air outlet 402 communicate with the same air duct. Alternatively, in other embodiments, the driving assembly 400 may be provided with multiple air ducts, and the air inlet 401 and the air outlet 402 communicate with different air ducts respectively.

[0046] In some embodiments, the housing 100 and the first cylinder 510 are coaxially arranged, and the inner diameter of the housing 100 is equal to the maximum outer diameter of the first cylinder 510. In this way, it is convenient for the inner wall of the housing 100 to better contact the outer surface of the first cylinder 510. Optionally, in a cross-section perpendicular to the axis of the first cylinder 510, the cross-sectional shape of the side wall of the groove 511 may be "C" shaped, "匚" shaped or any other arbitrary shape structure, which is not uniquely limited here.

[0047] In a possible design, please refer to Figure 4 and Figure 5The passive heat sink 500 further includes a second cylinder 520 coaxially arranged with the first cylinder 510, and the second cylinder 520 is located in the inner hole of the first cylinder 510. The outer diameter of the second cylinder 520 is smaller than the inner diameter of the first cylinder 510, and a connecting portion 530 is arranged between the first cylinder 510 and the second cylinder 520, and the connecting portion 530 is respectively connected to the first cylinder 510 and the second cylinder 520. In this arrangement, by arranging the second cylinder 520, the second cylinder 520 can support the first cylinder 510 through the connecting portion 530, which is conducive to improving the structural strength of the passive heat sink 500. Optionally, the connection method of the connecting portion 530 to the first cylinder 510 and the second cylinder 520 includes bonding, welding, clamping or any other connection method. Exemplarily, the first cylinder 510 , the second cylinder 520 and the connecting portion 530 may also be connected into an integral structure by integral molding (integral injection molding or integral casting, etc.), which is beneficial to further improve the structural strength of the passive heat sink 500 .

[0048] In some embodiments, the groove 511 can be formed on the outer surface of the first barrel 510 by cutting; or, the groove 511 can be formed on the outer surface of the first barrel 510 by stamping; or, a corresponding mold can be designed to directly form the groove 511 on the outer surface of the first barrel 510 during the integral molding of the first barrel 510, the second barrel 520 and the connecting portion 530. In a possible design, please refer to Figure 4 The inner surface of the first cylinder 510 has a connection area, which is opposite to the area where the groove 511 is formed on the outer surface of the first cylinder 510, and the connection area is connected to the connection part 530. In this way, the bottom wall of the groove 511 can be supported by the connection part 530 to a certain extent, thereby improving the structural strength of the first cylinder 510 where the groove 511 is formed.

[0049] In one possible design, see Figures 5 to 7, the air outlet 402 is opposite to the groove 511, and the air inlet 401 is opposite to the gap between the first barrel 510 and the second barrel 520. Since the outer diameter of the second barrel 520 is smaller than the outer diameter of the first barrel 510, the outer wall of the second barrel 520 and the inner wall of the first barrel 510 are spaced apart, so that an annular hole is formed between the first barrel 510 and the second barrel 520, and the gap between the first barrel 510 and the second barrel 520 specifically refers to the annular hole. In this embodiment, the annular hole is specifically the second air flow channel 502. Such an arrangement allows the airflow flowing from the driving component 400 to the passive heat sink 500 to first flow through the air outlet 402 to the first airflow channel 501, and directly transfer part of the heat in the airflow to the outer shell 100, thereby performing preliminary heat dissipation on the airflow. After the airflow flows from the first airflow channel 501 to the second airflow channel 502, the heat in the airflow is transferred to the outer shell 100 through the first cylinder 510 to perform secondary heat dissipation on the airflow, thereby effectively improving the heat dissipation efficiency and effect.

[0050] In a possible design, there are multiple air outlets 402 and multiple air inlets 401, and there are multiple grooves 511. Multiple grooves 511 are arranged at intervals around the axial direction of the first cylinder 510, and multiple grooves 511 are arranged one-to-one with multiple air outlets 402. Multiple air inlets 401 are opposite to the gap between the first cylinder 510 and the second cylinder 520. By providing multiple air outlets 402 and multiple air inlets 401, it is helpful to speed up the air circulation speed, thereby improving the heat dissipation efficiency.

[0051] In one example, if Figure 5 As shown, there are two air outlets 402 and two grooves 511, which are arranged at intervals around the circumference of the first cylinder 510, and the two air outlets 402 are respectively opposite to different grooves 511. There can also be two air inlets 401, which are arranged at intervals on a side of the driving assembly 400 close to the passive heat sink 500.

[0052] Optionally, there are multiple connecting parts 530, and the multiple connecting parts 530 are arranged in a one-to-one correspondence with the multiple grooves 511. Figure 4 and Figure 5 As shown, there are two grooves 511 and two connecting parts 530. Accordingly, the inner surface of the first cylinder 510 has two connecting areas, and the two connecting areas are respectively connected to different connecting parts 530. Specifically, the two connecting areas are arranged in a one-to-one correspondence with the two grooves 511.

[0053] In one possible design, see Figure 4 and Figure 5The inner surface of the first cylinder 510 is provided with a plurality of heat sinks 540, and the length direction of the heat sinks 540 is parallel to or arranged at an acute angle to the axial direction of the first cylinder 510. In this arrangement, by providing a plurality of heat sinks 540, the heat exchange area between the passive heat sink 500 and the airflow is increased, thereby further improving the heat dissipation efficiency.

[0054] In some embodiments, a plurality of heat sinks 540 are installed on the inner surface of the first cylinder 510 at intervals around the circumference of the first cylinder 510, and the plurality of heat sinks 540 are spaced apart from the second cylinder 520. Such an arrangement can reduce the resistance to air flow to promote air circulation. Optionally, the plurality of heat sinks 540 are divided into a plurality of groups, each group includes a plurality of heat sinks 540 spaced apart around the circumference of the first cylinder 510, and the plurality of groups of heat sinks 540 are spaced apart around the circumference of the first cylinder 510, and in the circumferential direction of the first cylinder 510, the distance between two adjacent groups of heat sinks 540 is greater than the distance between two adjacent heat sinks 540 in each group of heat sinks 540.

[0055] In one possible design, Figure 6 As shown, the drive assembly 400 includes a drive structure 430, a transmission structure 420 and a tensioning structure 410, wherein the transmission structure 420 is disposed between the drive structure 430 and the tensioning structure 410, and the drive structure 430 is transmission-connected to the tensioning structure 410 through the transmission structure 420, and the tensioning structure 410 is fixedly connected to the housing 100. Specifically, the drive structure 430 is connected to the transmission structure 420, and the transmission structure 420 is connected to the tensioning structure 410, and the drive structure 430 drives the transmission structure 420 to rotate, thereby driving the tensioning structure 410 to rotate, thereby driving the housing 100 to rotate through the tensioning structure 410. The passive heat sink 500 is installed on a side of the tensioning structure 410 away from the drive structure 420, and the accommodating cavity 4321 is disposed at an end of the drive structure 430 away from the transmission structure 420. In this arrangement, the tensioning structure 410 can form a more stable connection with the housing 100 , and the driving structure 430 drives the tensioning structure 410 to rotate via the transmission structure 420 , thereby driving the housing 100 to rotate.

[0056] Optionally, at least one of the driving structure 430, the transmission structure 420 and the tensioning structure 410 is provided with an air duct. In one example, the outer surface of the transmission structure 420 is spaced apart from the inner wall of the inner cavity 110, and the tensioning structure 410 and the driving structure 430 are respectively provided with air ducts. In this embodiment, the air inlet 401 and the air outlet 402 are specifically formed on the side of the tensioning structure 410 close to the passive heat sink 500, and the air inlet 401 and the air outlet 402 are specifically connected to the air duct in the tensioning structure 410. When the air supply structure 300 is working, the airflow passes through the air duct of the driving structure 430, the gap between the outer surface of the transmission structure 420 and the inner wall of the inner cavity 110, and the air duct of the tensioning structure 410 from the accommodating cavity 4321, and then enters the air inlet channel of the passive heat sink 500. Alternatively, in another optional example, the driving structure 430, the transmission structure 420 and the tensioning structure 410 are all provided with air ducts, and the air ducts of the driving structure 430, the air ducts of the transmission structure 420 and the air ducts of the tensioning structure 410 are connected in sequence, the air duct of the driving structure 430 is connected to the accommodating cavity 4321, and the air duct of the tensioning structure 410 is connected to the inner cavity 110.

[0057] Specifically, see Figures 6 to 8 The tensioning structure 410 divides the inner cavity 110 into a first cavity 111 and a second cavity 112, and the tensioning structure 410 is provided with a first connecting passage 411 connecting the first cavity 111 and the second cavity 112. The driving structure 430 includes a driving member 431 and an inner shell 432, and the inner shell 432 is installed in the first cavity 111 and is spaced apart from the side wall of the first cavity 111. The inner shell 432 has a receiving cavity 4321, and a through hole 4322 is provided through the side wall of the inner shell 432. The driving member 431 and the air supply structure 300 are both installed in the receiving cavity 4321, and the air supply structure 300 is located on the side of the driving member 431 away from the transmission structure 420, and at least part of the transmission structure 420 extends into the receiving cavity 4321 and is connected to the driving member 431. In this embodiment, the first connecting passage 411 is also the air duct in the tensioning structure 410. Such a configuration can effectively prevent the driving member 431 from colliding with or wearing the housing 100 during operation, thereby improving the safety of the drum motor.

[0058] Optionally, the transmission structure 420 is spaced apart from the inner wall of the housing 100. The air supply structure 300 drives the air in the accommodating cavity 4321 to flow, and the heat generated by the driving member 431 when working can pass through the through hole 4322, the gap between the inner shell 432 and the housing 100, the gap between the transmission structure 420 and the housing 100, and the first connecting channel 411 in sequence through the airflow, and then enter the air inlet channel of the passive heat sink 500.

[0059] Optionally, the driving member 431 may be a motor or other structure that can drive the transmission structure 420 to rotate. Optionally, the transmission structure 420 may be a planetary gearbox. Figure 6 and Figure 7 As shown, the transmission structure 420 includes a speed reducer 421 and an output shaft 422. The speed reducer 421 can be a gear reduction box or other speed reduction structures. The speed reducer 421 is connected to the output shaft 422 and the output end of the driving member respectively. The output shaft 422 is connected to the tensioning structure 410. The outer peripheral surface of the tensioning structure 410 abuts against the side wall of the inner cavity 110. The tensioning structure 410 is fixedly connected to the housing 100 through the friction between the outer peripheral surface of the tensioning structure 410 and the side wall of the inner cavity 110. Optionally, please refer to Figure 3 The outer circumference of the tensioning structure 410 is provided with concave and convex patterns to increase the roughness of the outer circumference of the tensioning structure 410 , thereby facilitating increasing the connection stability between the tensioning structure 410 and the housing 100 .

[0060] Specifically, Figure 6 or Fig. 9 ( Fig. 9 The middle shell 100 is hidden, and the inner shell 432 is shown in a perspective form. As shown in FIG. 4 , the driving member is provided with a second connecting passage 4311 from the side close to the air supply structure 300 to the side close to the transmission structure 420, and the through hole 4322 is provided on the side wall of the accommodating cavity 4321 in an area opposite to the driving member and the transmission structure 420. With such a configuration, when the air supply structure 300 is working, the air in the accommodating cavity 4321 is driven to flow toward the driving member, thereby forming an airflow in the accommodating cavity 4321. The airflow passes through the second connecting passage 4311 of the driving member to better take away the heat in the driving member and discharge the accommodating cavity 4321 through the through hole 4322, and finally flows to the passive heat sink 500 through the air duct in the tensioning structure 410.

[0061] Optionally, the air supply structure 300 can be a blower motor or other structure that can drive air flow. Optionally, the number of through holes 4322 is multiple, and multiple through holes 4322 are arranged at intervals on the side wall of the accommodating cavity 4321. Optionally, the number of connecting channels is also multiple, and multiple connecting channels are arranged at intervals through the driving member. In this way, the heat dissipation efficiency of the drum motor is improved.

[0062] In one possible design, Fig. 9As shown, a mounting member 320 is also installed in the accommodating cavity 4321. The mounting member 320 is located on the side of the air supply structure 300 away from the driving member. The air supply structure 300 is installed on the mounting member 320. The mounting member 320 is provided with at least one through hole 321 respectively connected to the accommodating cavity 4321 and the inner cavity 110. This arrangement allows the air in the second cavity 112 to enter the accommodating cavity 4321 through the through hole 321 on the mounting member 320, thereby forming an air circulation in the second cavity 112, so that the air supply structure 300 drives the air flow and improves the heat dissipation efficiency. It is worth noting that this embodiment can be implemented under the premise that the driving member is provided with a second connecting channel 4311 in the above embodiment, but is not limited to it. That is to say, when the driving member is provided with the second connecting channel 4311, the mounting member 320 may or may not be installed in the accommodating chamber 4321; and when the mounting member 320 is installed in the accommodating chamber 4321, the driving member may or may not be provided with the second connecting channel 4311.

[0063] Alternatively, if Fig. 9 As shown, the drum motor also includes a fixing frame 310, which is arranged between the driving member and the mounting member 320. The fixing frame 310 is provided with a mounting hole along the axis extension direction of the housing 100, the air supply structure 300 is installed in the mounting hole, and the fixing frame 310 is installed on the mounting member 320. Optionally, the fixing frame 310 and the mounting member 320 can be connected in any manner such as plug-in, screw connection, clamping or welding. In one example, a connecting column 311 is provided on one side of the fixing frame 310 close to the mounting member 320, and the mounting member 320 is provided with a plurality of the above-mentioned through holes 321, and the connecting column 311 is inserted into one of the through holes 321. Optionally, the number of the connecting columns 311 is multiple, the number of through holes 321 is greater than the number of the connecting columns 311, and each connecting column 311 is inserted into a different through hole 321. Exemplarily, the number of the connecting columns 311 is two, and the two connecting columns 311 are arranged at intervals on one side of the fixing frame 310 close to the mounting member 320.

[0064] In some embodiments, the drum motor further includes a support structure 220 and a fixed structure 210. The outer shell 100 is a cylindrical structure, and the inner hole of the outer shell 100 is the inner cavity 110 of the outer shell 100. The outer shell 100 has a first opening and a second opening connected to the inner cavity 110, and the first opening and the second opening are respectively located at two ends of the outer shell 100 in its own axial direction. At least part of the structure of the fixed structure 210 is installed in the inner cavity 110 via the first opening and covers the first opening, and at least part of the structure of the support structure 220 is installed in the inner cavity 110 via the second opening and covers the second opening. Specifically, the first opening is connected to the first chamber 111 of the inner cavity 110, and the second opening is connected to the second chamber 112 of the inner cavity 110. The support structure 220 is used to support the outer shell 100 so as to stably install the drum motor on an external device. The fixed structure 210 is used to limit the inner shell 432 and the mounting member 320 so that the mounting member 320 is fixedly installed in the accommodating cavity 4321.

[0065] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A drum motor, characterized in that: It includes a shell, a passive heat sink, a driving assembly and an air supply structure, the shell has an inner cavity, the passive heat sink and the driving assembly are both installed in the inner cavity, and the passive heat sink contacts the inner wall of the shell; an accommodating cavity is provided at one end of the driving assembly away from the passive heat sink, the air supply structure is installed in the accommodating cavity, an air supply port is provided on the side of the air supply structure close to the driving assembly, and the driving assembly is also provided with an air duct connecting the accommodating cavity and the inner cavity, and the air duct is located between the air supply structure and the passive heat sink.

2. The drum motor according to claim 1, characterized in that: The passive heat sink comprises a first cylinder, wherein the first cylinder and the driving assembly are sequentially arranged along the axial direction of the first cylinder; the outer surface of the first cylinder contacts the inner wall of the outer shell, and a side of the first cylinder facing away from the driving assembly is spaced from the side wall of the inner cavity; a groove is formed on the outer surface of the first cylinder, and the groove penetrates the first cylinder along the axial direction of the first cylinder; an air inlet and an air outlet connected to the air duct are formed on one side of the driving assembly close to the passive heat sink, and one of the air inlet and the air outlet is opposite to the groove, and the other is opposite to the inner hole of the first cylinder.

3. The drum motor according to claim 2, characterized in that: The passive heat dissipation element also includes a second cylinder coaxially arranged with the first cylinder, and the second cylinder is located in the inner hole of the first cylinder; the outer diameter of the second cylinder is smaller than the inner diameter of the first cylinder, and a connecting part is arranged between the first cylinder and the second cylinder, and the connecting part is respectively connected to the first cylinder and the second cylinder.

4. The drum motor according to claim 3, characterized in that: The inner surface of the first cylinder has a connection area, the connection area is opposite to the area of ​​the outer surface of the first cylinder where the groove is formed, and the connection area is connected to the connection part.

5. The drum motor according to claim 3, characterized in that: The air outlet is opposite to the groove, and the air inlet is opposite to the gap between the first cylinder and the second cylinder.

6. The drum motor according to claim 5, characterized in that: The number of the air outlets and the number of the air inlets are both multiple, and the number of the grooves is also multiple. The multiple grooves are arranged at intervals around the axial direction of the first cylinder, and the multiple grooves are arranged one-to-one with the multiple air outlets, and the multiple air inlets are all opposite to the gap between the first cylinder and the second cylinder.

7. The drum motor according to any one of claims 2 to 6, characterized in that: A plurality of heat sinks are disposed on the inner surface of the first cylinder, and the length direction of the heat sinks is parallel to or at an acute angle to the axial direction of the first cylinder.

8. The drum motor according to any one of claims 1 to 6, characterized in that: The driving assembly includes a driving structure, a transmission structure and a tensioning structure, wherein the transmission structure is arranged between the driving structure and the tensioning structure, the driving structure is transmission-connected to the tensioning structure via the transmission structure, and the tensioning structure is fixedly connected to the outer shell; the passive heat dissipation element is installed on a side of the tensioning structure away from the driving structure, and the accommodating cavity is arranged at an end of the driving structure away from the transmission structure.

9. The drum motor according to claim 8, characterized in that: The tensioning structure divides the inner cavity into a first chamber and a second chamber, and the tensioning structure is provided with a first connecting passage connecting the first chamber and the second chamber; the driving structure includes a driving member and an inner shell, the inner shell is installed in the first chamber and is spaced apart from the side wall of the first chamber, the inner shell has the accommodating cavity, and the side wall of the inner shell is penetrated by a through hole, the driving member and the air supply structure are both installed in the accommodating cavity, and the air supply structure is located on the side of the driving member away from the transmission structure, and at least part of the structure of the transmission structure extends into the accommodating cavity and is connected to the driving member.

10. The drum motor according to claim 9, characterized in that: The driving member is provided with a second communication passage extending from a side close to the air supply structure to a side close to the transmission structure, and the through hole is provided on a side wall of the accommodating cavity in an area opposite to the driving member and the transmission structure; and / or, A mounting member is also installed in the accommodating cavity. The mounting member is located on a side of the air supply structure away from the driving member. The air supply structure is installed on the mounting member. The mounting member is penetrated by at least one through hole respectively connected to the accommodating cavity and the inner cavity.

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