Brushed DC motor and vehicle

Abstract

The application relates to a brush DC motor and a vehicle. The brush DC motor comprises: an electrically conductive motor housing; a rotor mounted in the motor housing and rotatably mounted on a rotating shaft relative to the motor housing; an electrically insulating brush holder comprising opposite first and second sides, wherein the first side of the brush holder is mounted to the motor housing, and the second side of the brush holder is provided with a bearing seat; a bearing mounted to the bearing seat from the second side of the brush holder, and the rotating shaft penetrates through the first side of the brush holder to the second side and is supported by the bearing; an electrically conductive shielding cover comprising a base and a pressing structure on the base; and a gear box cover fixedly connected with the motor housing and clamping the base of the shielding cover between the motor housing and the gear box cover, and the pressing structure directly or indirectly presses the bearing and maintains electrical connection with the bearing. The brush DC motor can effectively improve electromagnetic compatibility.

Description

Technical Field

[0001] This application belongs to the field of electric motors, and more specifically, relates to a brushed DC motor and a vehicle equipped with the brushed DC motor. Background Technology

[0002] The information provided in this section is for the purpose of generally presenting the background of this disclosure. To the extent described in this section, the work of the currently named inventors and aspects of the description that may not constitute prior art at the time of filing are neither explicitly nor implicitly considered to be prior art of this disclosure.

[0003] In the field of electric motors, brushed DC motors are a type of DC motor that uses brushes and a commutator to achieve current commutation, thereby driving the rotor to rotate continuously. They are simple in structure, low in cost, and offer high starting torque and stable speed regulation performance, making them widely used in small household appliances, automotive auxiliary systems, power tools, and other fields. Utility Model Content

[0004] According to this application, a brushed DC motor is provided, comprising: Conductive motor housing; The rotor is mounted inside the motor housing and is rotatably mounted on a shaft relative to the motor housing; An electrically insulating brush holder includes a first side and a second side opposite to each other, wherein the first side of the brush holder is mounted to the motor housing, and the second side of the brush holder is provided with a bearing seat; A bearing is mounted to the bearing housing from the second side of the brush holder, and the rotating shaft extends from the first side of the brush holder to the second side and is supported by the bearing. A conductive shielding cover is mounted on a second side of the brush holder, wherein the shielding cover includes a base and a clamping structure located on the base; and A gearbox cover is fixedly connected to the motor housing, and the base of the shielding cover is clamped between the motor housing and the gearbox cover. The clamping structure directly or indirectly clamps the bearing and maintains an electrical connection with the bearing.

[0005] Optionally, in the brushed DC motor as described above, the base of the shielding cover is provided with a skirt portion for covering the outer edge of the motor housing; and / or The brushed DC motor further includes: A printed circuit board, disposed on the second side of the brush holder and electrically connected to the motor housing via a grounding conductor; and An elastic element is disposed between the printed circuit board and the shielding cover, and is electrically connected to both the printed circuit board and the shielding cover.

[0006] Optionally, in the brushed DC motor as described above, the clamping structure includes a clamping body and a clamping spring extending from the clamping body toward the bearing, the clamping body being fixedly connected to the base, and the clamping body having a receiving cavity that matches the bearing housing.

[0007] Optionally, in the brushed DC motor as described above, the shielding cover is made of plastic filled with conductive carbon fibers; and / or The shielding cover is made of metal; and / or The shielding cover is made of plastic and coated with a metallic conductive coating.

[0008] Optionally, in the brushed DC motor as described above, the base and / or clamping structure of the shielding cover is provided with a positioning structure for positioning the shielding cover on the brush holder.

[0009] Optionally, in the brushed DC motor described above, the bearing is a powder metallurgy oil-impregnated bearing.

[0010] Optionally, in the brushed DC motor described above, the thickness of the shielding cover ranges from 0.1 to 2 mm; and / or The gearbox housing is made of plastic.

[0011] Optionally, in the brushed DC motor as described above, the number of clamping springs is at least three, and the at least three clamping springs are identical in shape and size and arranged circumferentially around the bearing; and / or The base and the clamping body are integrally formed.

[0012] Alternatively, in the brushed DC motor as described above, the gearbox cover is fixed to the motor housing by bolts.

[0013] In addition, according to this application, a vehicle is also provided, which is equipped with the above-mentioned brushed DC motor.

[0014] It is understood that the shielding cover used in the brushed DC motor of this application can form an electromagnetic barrier together with the motor housing, thereby preventing the electromagnetic radiation generated by the motor itself from leaking outward and further improving the overall EMC performance. In addition, the shielding cover has advantages such as convenient manufacturing, flexible arrangement and low production cost, and does not occupy too much internal space of the motor. Attached Figure Description

[0015] The disclosure of this application will become more readily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. Furthermore, similar numbers in the drawings are used to denote similar components, wherein: Figure 1 An exploded perspective view of a brushed DC motor disclosed in this application is shown; Figure 2 A schematic diagram of the brush holder of a brushed DC motor disclosed in this application is shown. Figure 3 A partial cross-sectional schematic diagram of the brushed DC motor disclosed in this application is shown. Figure 4 A schematic diagram of one embodiment of the shielding cover of a brushed DC motor disclosed in this application is shown; Figure 5 This invention illustrates a structural schematic diagram from a first-view perspective of another embodiment of the shielding cover for a brushed DC motor disclosed in this application; and Figure 6 It shows Figure 5 A schematic diagram of the shielding cover from a second-person perspective. Detailed Implementation

[0016] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. First, it should be noted that the directional terms such as up, down, left, right, front, back, inner, outer, top, and bottom mentioned or possibly used in this specification are defined relative to the structures shown in the accompanying drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0017] In this application, unless otherwise expressly specified and limited, the term "fixed" and similar terms should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0018] Electromagnetic compatibility (EMC) is crucial in the automotive industry. It refers to the ability of a vehicle and its electrical and electronic systems to operate normally in an electromagnetic environment without causing electromagnetic interference to surrounding equipment.

[0019] To achieve this EMC application and effectively reduce electromagnetic interference in automotive systems, the following describes a specific embodiment of a brushed DC motor for automotive applications. Figure 1 The structure of a brushed DC motor disclosed in this application is shown. The brushed DC motor 10 comprises components such as a motor housing 100, a rotor 200, a brush holder 300, a bearing 400, a shielding cover 500, washers 600, and a gearbox cover 700. The motor housing 100 is made of a conductive material, such as metal, and the rotor 200 and stator (not shown) are mounted within the motor housing 100, wherein the rotor 200 is rotatably mounted on a shaft 210 relative to the motor housing 100. The brush holder 300 is made of an electrically insulating material and includes opposing first sides 301 and second sides 302, wherein the first side 301 of the brush holder 300 is mounted to the motor housing 100, and the second side 302 of the brush holder 300 is provided with a bearing seat 310. The bearing 400 is, for example, a powder metallurgy oil-impregnated bearing, and is mounted to the bearing housing 310 from the second side 302 of the brush holder 300. The rotating shaft 210 extends from the first side 301 of the brush holder 300 to the second side 302 and is supported by the bearing 400. During assembly, the bearing 400 can be pressed against the brush holder 300 by the washer 600.

[0020] In the above embodiments, the shielding cover 500 is typically made of a conductive material and is mounted on the second side 302 of the brush holder 300. The shielding cover 500 includes a base 510 and a clamping structure 520 located on the base 510, such as... Figure 2 and Figure 3 As shown. The gearbox cover 700 is detachably fixed to the motor housing 100 by means such as bolts, and the base 510 of the shielding cover 500 is clamped between the motor housing 100 and the gearbox cover 700. The clamping structure 520 directly or indirectly clamps the bearing 400 and maintains an electrical connection with the bearing 400. The shielding cover 500 used in the brushed DC motor 10 of this application can form an electromagnetic barrier together with the motor housing 100 and the bearing 400 or the washer 600, thereby preventing the electromagnetic radiation generated by itself from leaking outward, and further improving the overall EMC performance. In addition, the shielding cover 500 does not occupy too much internal space of the brushed DC motor 10.

[0021] Specifically, the shielding cover 500 includes a base 510 and a clamping structure 520 located on the base 510. The clamping structure 520 includes a clamping body 521 and clamping springs 522 extending from the clamping body 521 toward the bearing 400 or the washer 600. The clamping body 521 is fixedly connected to the base 510, for example, the base 510 and the clamping body 521 are integrally formed, and the clamping springs 522 maintain contact with the bearing 400 or the washer 600. As an alternative, the number of clamping springs 522 is at least three, the at least three clamping springs 522 are of the same shape and size, and are arranged circumferentially spaced around the bearing 400, such as... Figures 4 to 6 As shown. The brush holder 300 has a cylindrical bearing seat 310 for accommodating the bearing 400 and the washer 600, and the clamping body 521 of the clamping structure 520 has a receiving cavity that matches the bearing seat 310.

[0022] Continue to refer to Figure 2 and Figure 3 The brushed DC motor 10 also includes a printed circuit board 800 and an elastic element 900. The printed circuit board 800 is disposed on the second side 302 of the brush holder 300 and is electrically connected to the motor housing 100 via a grounding conductor 810. The elastic element 900 is disposed between the printed circuit board 800 and the shielding cover 500, and is electrically connected to both the printed circuit board 800 and the shielding cover 500. Alternatively, the base 510 of the shielding cover 500 is provided with a skirt 511 for covering the outer edge of the motor housing 100, allowing direct contact between the shielding cover 500 and the motor housing 100, thereby achieving a reliable electrical connection. In this case, components such as the elastic element 900 can be advantageously omitted.

[0023] It should be specifically noted that the shielding cover 500 can be made of materials such as metal. For example, the shielding cover 500 can be made of plastic and coated with a conductive metallic coating. Yet another example is that the shielding cover 500 can be made of plastic filled with conductive carbon fibers. Those skilled in the art know that conductive carbon fiber plastic, compared to metal, not only has advantages such as lightweight and corrosion resistance, but also combines conductivity and structural function, and can adapt to scenario requirements that are difficult to meet with metal. Furthermore, for the purpose of ease of assembly and cost reduction, the shielding cover 500 can be designed to be very thin, for example, with a thickness ranging from 0.1 to 2 mm.

[0024] In order to better position the shielding cover 500 on the brush holder 300, a positioning structure 530 may be provided on the base 510 and / or the clamping structure 520 of the shielding cover 500 to position the shielding cover 500 in the X, Y and Z directions, wherein the Z direction is the axial direction of the brushed DC motor 10, and the X and Y directions are located on a plane perpendicular to the axial direction of the brushed DC motor 10 and are 90° to each other.

[0025] In addition, this application also provides a vehicle equipped with the aforementioned brushed DC motor 10. The vehicle can be a private car, taxi, bus, minibus, or large bus, or any other type of vehicle. The technical improvements and beneficial effects of the vehicle are the same as those of the brushed DC motor 10, therefore, a detailed description of the vehicle is not provided here.

[0026] The foregoing has provided several specific embodiments to illustrate the brushed DC motor of this application and the vehicle equipped with the brushed DC motor. These examples are for illustrative purposes only and are not intended to limit the scope of this application. Various modifications and improvements can be made by those skilled in the art without departing from the spirit and scope of this application. Therefore, all equivalent technical solutions should fall within the scope of this application and be defined by the claims of this application.

Claims

1. A brushed DC motor, characterized in that, It includes: Conductive motor housing (100); A rotor (200) is mounted inside the motor housing (100) and is rotatably mounted on a shaft (210) relative to the motor housing (100); An electrically insulated brush holder (300) includes a first side (301) and a second side (302) opposite to each other, wherein the first side (301) of the brush holder (300) is mounted to the motor housing (100), and the second side (302) of the brush holder (300) is provided with a bearing seat (310). A bearing (400) is mounted from the second side (302) of the brush holder (300) to the bearing housing (310), and a rotating shaft (210) extends from the first side (301) of the brush holder (300) to the second side (302) and is supported on the bearing (400). A conductive shielding cover (500) is mounted on the second side (302) of the brush holder (300), wherein the shielding cover (500) includes a base (510) and a clamping structure (520) located on the base (510); and The gearbox cover (700) is fixedly connected to the motor housing (100) and the base (510) of the shield cover (500) is clamped between the motor housing (100) and the gearbox cover (700). The clamping structure (520) directly or indirectly clamps the bearing (400) and maintains an electrical connection with the bearing (400).

2. The brushed DC motor according to claim 1, characterized in that, The base (510) of the shielding cover (500) is provided with a skirt (511) for covering the outer edge of the motor housing (100); and / or The brushed DC motor (10) also includes: A printed circuit board (800) disposed on the second side (302) of the brush holder (300) and electrically connected to the motor housing (100) via a grounding conductor (810); and An elastic element (900) is disposed between the printed circuit board (800) and the shielding cover (500) and is electrically connected to the printed circuit board (800) and the shielding cover (500) respectively.

3. The brushed DC motor according to claim 2, characterized in that, The clamping structure (520) includes a clamping body (521) and a clamping spring (522) extending from the clamping body (521) toward the bearing (400). The clamping body (521) is fixedly connected to the base (510) and has a receiving cavity that matches the bearing seat (310).

4. The brushed DC motor according to any one of claims 1-3, characterized in that, The shielding cover (500) is made of plastic filled with conductive carbon fibers; and / or The shielding cover (500) is made of metal; and / or The shielding cover (500) is made of plastic and coated with a metallic conductive coating.

5. The brushed DC motor according to any one of claims 1-3, characterized in that, The base (510) and / or clamping structure (520) of the shielding cover (500) are provided with a positioning structure (530) for positioning the shielding cover (500) on the brush holder (300).

6. The brushed DC motor according to any one of claims 1-3, characterized in that, The bearing (400) is a powder metallurgy oil-impregnated bearing.

7. The brushed DC motor according to any one of claims 1-3, characterized in that, The thickness of the shielding cover (500) is between 0.1-2 mm; and / or The gearbox housing (700) is made of plastic.

8. The brushed DC motor according to claim 3, characterized in that, The number of the clamping springs (522) is at least three, and the at least three clamping springs (522) are identical in shape and size and arranged circumferentially around the bearing (400); and / or The base (510) and the pressing body (521) are integrally formed.

9. The brushed DC motor according to any one of claims 1-3, characterized in that, The gearbox cover (700) is fixed to the motor housing (100) by bolts.

10. A vehicle, characterized in that, The vehicle is equipped with a brushed DC motor (10) according to any one of claims 1-9.

Images