Brushed motor noise reduction structure

Abstract

The application relates to a brush motor noise reduction structure and relates to the technical field of motor production. The brush motor noise reduction structure comprises a plastic shell and sound-absorbing cotton, the plastic shell and the sound-absorbing cotton are connected through two connecting assemblies, the connecting assembly comprises a connecting rod and connecting cloth, one end of the connecting cloth is fixed on the inner wall of the plastic shell, the other end of the connecting cloth is fixed on the connecting rod, the connecting cloth is wound on the connecting rod, and one side of the connecting cloth close to the sound-absorbing cotton is provided with glue. The application has the effects that the sound-absorbing cotton and the plastic shell are connected conveniently, and the production efficiency is high.

Description

Technical Field

[0001] This application relates to the field of motor manufacturing, and in particular to a noise reduction structure for a brushed motor. Background Technology

[0002] Traditional brushed motors typically use a combination of aluminum and iron housings. This structure generates significant noise during motor operation, negatively impacting the user experience.

[0003] To reduce noise, sound-absorbing materials are used inside the motor housing. However, this is usually achieved through complex fixing structures or additional assembly steps, resulting in low production efficiency, which needs to be improved. Summary of the Invention

[0004] To address the issue of low production efficiency caused by the complex connection between the noise-absorbing material and the motor housing, this application provides a noise reduction structure for a brushed motor.

[0005] The noise reduction structure for a brushed motor provided in this application adopts the following technical solution: A noise reduction structure for a brushed motor includes a plastic shell and sound-absorbing cotton. The plastic shell and the sound-absorbing cotton are connected by two connecting components. Each connecting component includes a connecting rod and a connecting cloth. One end of the connecting cloth is fixed to the inner wall of the plastic shell, and the other end is fixed to the connecting rod. The connecting cloth is wound around the connecting rod, and adhesive is applied to the side of the connecting cloth near the sound-absorbing cotton.

[0006] By adopting the above technical solution, in the initial state, the connecting cloth is wound around the connecting rod with the adhesive side facing inward. During installation, the sound-absorbing cotton is inserted into the plastic shell. Because the connecting component protrudes from the inner wall of the plastic shell, the part of the sound-absorbing cotton in contact with the connecting component deforms, allowing the sound-absorbing cotton to be fully inserted into the plastic shell. Then, the connecting rod is rotated to gradually unfold the connecting cloth, so that the adhesive side of the connecting cloth opens and faces the sound-absorbing cotton, thus adhering the sound-absorbing cotton to the connecting cloth. When the connecting cloth is fully unfolded, the entire circumference of the connecting cloth and the sound-absorbing cotton is connected. Because the connecting cloth is connected to the plastic shell, the sound-absorbing cotton is also connected to the plastic shell, making the operation convenient and improving production efficiency.

[0007] Optionally, the connecting fabric has a pile on the side away from the sound-absorbing cotton.

[0008] By adopting the above technical solution, when the connecting cloth is in a wound state with the pile facing outwards, during the process of unfolding the connecting cloth after the sound-absorbing cotton is inserted into the plastic shell, the pile will first contact the outer wall of the sound-absorbing cotton and slide on the side wall of the sound-absorbing cotton, thereby cleaning the dust and impurities on the sound-absorbing cotton and cleaning the outer wall of the sound-absorbing cotton. Then, the glue that was originally facing inwards of the connecting cloth will contact the area of ​​the sound-absorbing cotton that was just cleaned by the pile, so that the sound-absorbing cotton is fixedly adhered to the connecting cloth. This process makes it less likely for impurities and dust to appear where the glue adheres to the sound-absorbing cotton, increasing the tightness of the connection between the connecting cloth and the sound-absorbing cotton.

[0009] The lint from the cleaned sound-absorbing cotton then moves towards the plastic shell and abuts against the inner wall of the shell. As the connecting cloth is rolled up, the lint adheres to the glue, resulting in some glue sticking to the lint as well. When the lint abuts against the inner wall of the plastic shell, the side of the connecting cloth with the lint is also fixed to the plastic shell by the glue, thus achieving a fixed connection between the connecting cloth and the plastic shell, thereby increasing the stability of the sound-absorbing cotton installed in the plastic shell.

[0010] Optionally, one end of the connecting rod is provided with a driving assembly, which can extend out of the plastic shell. The driving assembly includes a driving rod, and the end wall of the connecting rod is provided with a mounting hole. The driving rod is inserted into the mounting hole and can move along the length direction of the connecting rod in the mounting hole. The driving rod is connected to the connecting rod through a limiting member.

[0011] By adopting the above technical solution, both the connecting rod and the connecting cloth are located inside the plastic shell. After the sound-absorbing cotton is inserted into the plastic shell, the connecting rod is embedded between the sound-absorbing cotton and the plastic shell, making it impossible for the operator to operate the connecting rod. At this time, the operator can directly rotate the drive rod. Because the drive rod and the connecting rod are connected by a limit device, the drive rod rotates on its own and drives the connecting rod to rotate synchronously to open the connecting cloth, making the operation convenient.

[0012] Optionally, the limiting component includes a concave block and a limiting block. The concave block is fixed on the inner wall of the mounting hole, and the limiting block is fixed on the side wall of the drive rod. The limiting block can be adapted to be inserted into the concave block.

[0013] By adopting the above technical solution, the drive rod is inserted into the mounting hole, and the limiting block is aligned and inserted into the concave block. At this time, the side wall of the limiting block abuts against the side wall of the concave block. When the drive rod rotates, the limiting block applies a pushing force to the concave block, causing the concave block to move simultaneously, thereby making the connecting rod rotate synchronously and move along the trajectory of the plastic shell to realize the opening of the connecting cloth, which is convenient to operate.

[0014] Optionally, a plurality of movable rods are fixed on the side wall of the drive rod extending from the mounting hole, and the movable rods are perpendicular to the drive rod.

[0015] By adopting the above technical solution, the movable rod provides a force application point for the hand, and the drive rod can be driven to rotate by directly pushing the movable rod, which is more time-saving and labor-saving.

[0016] Optionally, the movable rods on the two drive rods can cross each other, and one of the movable rods on the drive rod is provided with a positioning component.

[0017] By adopting the above technical solution, when the connecting fabric is fully unfolded, the two connecting rods meet. At this time, the driving rod is moved upward in the mounting hole, causing the limiting block to move out of the concave block. Then, the driving rod is rotated so that the moving rods on the two driving rods cross each other. Subsequently, the positioning component is used to prevent the moving rods on the two driving rods from turning out, maintaining the cross-crossing state, thus achieving a fixed connection between the two driving rods. This prevents the connecting rods from moving away from each other, ensuring that the connecting fabric remains in the unfolded state.

[0018] Optionally, the positioning assembly includes several positioning blocks and several torsion springs. Several positioning rods are fixed on the side wall of the moving rod. The positioning rods are evenly distributed along the length of the moving rod. The positioning blocks correspond one-to-one with the positioning rods. The positioning blocks are sleeved on the positioning rods and can rotate on the positioning rods about the positioning rods as axes. The positioning blocks are inclined towards the direction of the driving rod. The torsion springs are sleeved on the positioning rods. One end of the torsion spring is fixed to the positioning rod, and the other end is fixed to the positioning block, for abutting the positioning block against the moving rod on another driving rod.

[0019] By adopting the above technical solution, when the moving rod of one drive rod is inserted between the adjacent moving rods of another drive rod, the moving rod will first abut against the side wall of the positioning block. Because the positioning block is tilted, it is easy to push the positioning block towards the positioning rod. The torsion spring deforms, that is, the positioning block rotates about the positioning rod as an axis. When the moving rod passes a positioning block, the torsion spring on that positioning block returns to its original deformation, causing the positioning block to reset. At this time, the moving rod is located on the other side of the positioning block. Under the restriction of the torsion spring, the moving rod cannot move away from the positioning block, thus making the moving rod positioned at this point, that is, the connecting rod on the two drive rods is not easily separated.

[0020] Optionally, the inner wall of the plastic shell is provided with a receiving groove, into which the connecting rod and the drive assembly can be inserted.

[0021] By adopting the above technical solution, after the connecting cloth is fully unfolded and the sound-absorbing cotton and plastic shell are connected, the two connecting rods meet. At this time, both connecting rods are inserted into the receiving groove, ensuring that there are no protrusions between the plastic shell and the sound-absorbing cotton, thus guaranteeing the integrity of the sound-absorbing cotton structure and making the sound-absorbing cotton and connecting cloth fit more snugly. At the same time, the connecting rods on the two drive rods are interlaced, and then the drive rods are moved down in the mounting rods until both the drive rods and the moving rods are inserted into the receiving grooves, ensuring that there are no protrusions on the surface of the plastic shell, facilitating the subsequent installation and use of the motor housing.

[0022] Optionally, a limiting hole is formed on the inner wall of the receiving groove, a limiting rod is inserted into the limiting hole, the limiting rod can move in the limiting hole, the limiting rod can pass through the receiving groove, a lever is fixed on the side wall of the limiting rod, the lever is perpendicular to the limiting rod, a moving hole is formed on the end wall of the plastic shell, the moving hole is connected to the limiting hole, the lever is inserted in the moving hole and can move in the moving hole.

[0023] By adopting the above technical solution, after both the connecting rod and the driving rod are inserted into the receiving groove, the moving lever is moved to drive part of the limiting rod to extend out of the moving hole and pass through the entire receiving groove, so that the end opening of the receiving groove is blocked, thereby preventing the driving rod from moving out of the receiving groove and realizing the positioning of the driving rod on the plastic shell.

[0024] Optionally, a fixing hole is provided on the inner wall of the movable hole, and a fixing block is inserted into the fixing hole. The fixing block is connected to the inner wall of the movable hole by a fixing spring, and the fixing spring is used to insert the fixing block into the movable hole.

[0025] By adopting the above technical solution, when the lever drives the moving rod through the receiving groove, the lever passes over the fixed block. At this time, the side wall of the fixed block is unobstructed. Under the action of the fixed spring, the fixed block is inserted into the moving hole, blocking the moving hole behind the lever. This prevents the lever from having any room for reset movement, thus fixing the lever on the plastic shell. In other words, the moving rod cannot move, maintaining the state of blocking the opening of the receiving groove.

[0026] In summary, this application includes at least one of the following beneficial effects: 1. Initially, the connecting cloth is wound around the connecting rod with the adhesive side facing inward. During installation, the sound-absorbing cotton is inserted into the plastic shell. Because the connecting component protrudes from the inner wall of the plastic shell, the part of the sound-absorbing cotton in contact with the connecting component deforms, allowing the sound-absorbing cotton to be fully inserted into the plastic shell. Then, the connecting rod is rotated to gradually unfold the connecting cloth, opening the adhesive side of the connecting cloth and facing the sound-absorbing cotton, thus adhering the sound-absorbing cotton to the connecting cloth. When the connecting cloth is fully unfolded, the entire circumference of the connecting cloth and the sound-absorbing cotton is connected. Because the connecting cloth is connected to the plastic shell, the sound-absorbing cotton is also connected to the plastic shell, making operation convenient and improving production efficiency. 2. When the connecting cloth is in its wound state with the nap facing outwards, as the sound-absorbing cotton is inserted into the plastic shell and the connecting cloth is unwound, the nap will first contact the outer wall of the sound-absorbing cotton and slide on the side wall, thereby cleaning the dust and impurities on the sound-absorbing cotton and cleaning the outer wall of the sound-absorbing cotton. Then, the glue that was originally facing inwards of the connecting cloth will come into contact with the area of ​​the sound-absorbing cotton that was just cleaned by the nap, so that the sound-absorbing cotton is fixedly adhered to the connecting cloth. This process makes it less likely for impurities and dust to accumulate where the glue adheres to the sound-absorbing cotton, increasing the tightness of the connection between the connecting cloth and the sound-absorbing cotton. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the brushed motor noise reduction structure according to an embodiment of this application; Figure 2 This is a cross-sectional view of the brushed motor noise reduction structure according to an embodiment of this application; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a structural diagram showing the connection relationship between the drive assembly and the connecting rod.

[0028] In the diagram: 10. Plastic shell; 11. Receiving groove; 12. Limiting hole; 13. Moving hole; 14. Fixing hole; 20. Sound-absorbing cotton; 30. Connecting assembly; 31. Connecting rod; 311. Mounting hole; 32. Connecting cloth; 40. Drive assembly; 41. Drive rod; 411. Moving rod; 42. Limiting component; 421. Concave block; 422. Limiting block; 50. Positioning assembly; 51. Positioning rod; 52. Positioning block; 53. Torsion spring; 60. Toggle lever; 70. Limiting rod; 80. Fixing block; 81. Fixing spring. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0030] This application discloses a noise reduction structure for a brushed motor. (Refer to...) Figure 1 and Figure 2The brushed motor noise reduction structure includes a plastic shell 10 and sound-absorbing cotton 20. The plastic shell 10 is placed with its opening facing upwards, and the plastic shell 10 and the sound-absorbing cotton 20 are connected by two connecting components 30.

[0031] Reference Figure 3 and Figure 4 The connecting assembly 30 includes a connecting rod 31 and a connecting cloth 32. One end of the connecting cloth 32 is fixed to the inner wall of the plastic shell 10, and the other end is fixed to the connecting rod 31. The connecting cloth 32 is wrapped around the connecting rod 31. The side of the connecting cloth 32 near the sound-absorbing cotton 20 is provided with glue, and the other side is provided with fluff.

[0032] In the initial state, the connecting cloth 32 is wrapped around the connecting rod 31 with the adhesive side of the connecting cloth 32 facing inward and the pile facing outward. During installation, the sound-absorbing cotton 20 is inserted into the plastic shell 10. Because the connecting component 30 protrudes from the inner wall of the plastic shell 10, the part of the sound-absorbing cotton 20 that contacts the connecting component 30 deforms, so that the sound-absorbing cotton 20 can be completely inserted into the plastic shell 10.

[0033] Reference Figure 3 and Figure 4 Next, the connecting rod 31 is rotated, simultaneously driving it to move along the trajectory of the plastic shell 10. This causes the connecting cloth 32 to gradually unfold. The fibers first contact the outer wall of the sound-absorbing cotton 20 and slide along it, thus cleaning off dust and impurities. This cleans the outer wall of the sound-absorbing cotton 20. Then, the adhesive on the connecting cloth 32, which was originally facing inward, contacts the area of ​​the sound-absorbing cotton 20 that was just cleaned by the fibers, causing the sound-absorbing cotton 20 to adhere firmly to the connecting cloth 32. This process prevents impurities and dust from accumulating at the point where the adhesive adheres to the sound-absorbing cotton 20, increasing the tightness of the connection between the connecting cloth 32 and the sound-absorbing cotton 20. Reference Figure 3 and Figure 4 The lint from the cleaned sound-absorbing cotton 20 will then move toward the plastic shell 10 and abut against the inner wall of the plastic shell 10. As the connecting cloth 32 is rolled up, the lint will stick to the glue, thus causing some glue to adhere to the lint as well. When the lint abuts against the inner wall of the plastic shell 10, the side of the connecting cloth 32 with the lint will also be fixed to the plastic shell 10 under the action of the glue, thus achieving a fixed connection between the connecting cloth 32 and the plastic shell 10, thereby increasing the stability of the sound-absorbing cotton 20 installed in the plastic shell 10.

[0034] When the connecting cloth 32 is fully unfolded, the connecting cloth 32 and the sound-absorbing cotton 20 are connected around the entire periphery. Because the connecting cloth 32 is connected to the plastic shell 10, the sound-absorbing cotton 20 and the plastic shell 10 are connected, making the operation convenient.

[0035] Reference Figure 3 and Figure 4 Since both the connecting rod 31 and the connecting cloth 32 are located inside the plastic shell 10, when the sound-absorbing cotton 20 is inserted into the plastic shell 10, the connecting rod 31 is embedded between the sound-absorbing cotton 20 and the plastic shell 10, making it impossible for the operator to operate the connecting rod 31. In order to facilitate the movement and rotation of the connecting rod 31, a driving assembly 40 is provided at the top of the connecting rod 31. The driving assembly 40 can extend out of the plastic shell 10. The driving assembly 40 includes a driving rod 41. An installation hole 311 is opened on the top wall of the connecting rod 31. The driving rod 41 is vertically inserted into the installation hole 311 and can move up and down in the installation hole 311.

[0036] When the drive rod 41 rotates, in order to drive the connecting rod 31 to rotate synchronously, a limiting member 42 is provided in the mounting hole 311. The limiting member 42 includes a concave block 421 and a limiting block 422. The concave block 421 is fixed on the inner wall of the mounting hole 311 with its opening facing upwards. The limiting block 422 is fixed on the side wall of the drive rod 41 and can be fitted into the concave block 421. The drive rod 41 is inserted into the mounting hole 311, and the limiting block 422 is aligned and inserted into the concave block 421. At this time, the side wall of the limiting block 422 abuts against the side wall of the concave block 421. When the drive rod 41 rotates, the limiting block 422 applies a pushing force to the concave block 421, causing the concave block to move simultaneously, thereby making the connecting rod 31 rotate synchronously and move along the trajectory of the plastic shell 10, so as to open the connecting cloth 32, which is convenient to operate.

[0037] Reference Figure 4 Several movable rods 411 are fixed on the side wall of the drive rod 41 extending out of the mounting hole 311. The movable rods 411 are evenly distributed along the length of the drive rod 41. The movable rods 411 are perpendicular to the drive rod 41. The limiting rod 70 acts as a handle. The drive rod 41 can be driven to rotate by directly pushing the movable rod 411, which is more time-saving and labor-saving.

[0038] Reference Figure 4 The movable rods 411 on the two drive rods 41 can cross each other, and a positioning component 50 is provided on the movable rod 411 on one of the drive rods 41. The positioning component 50 includes several positioning blocks 52 and several torsion springs 53. Several positioning rods 51 are fixed on the side wall of the movable rod 411. The positioning rods 51 are evenly distributed along the length direction of the movable rod 411. Several positioning blocks 52 correspond one-to-one with the positioning rods 51. The positioning blocks 52 are sleeved on the positioning rods 51 and can rotate on the positioning rods 51 with the positioning rods 51 as the axis. The positioning blocks 52 are inclined towards the drive rod 41. The torsion springs 53 are sleeved on the positioning rods 51. One end of the torsion springs 53 is fixed to the positioning rods 51 and the other end is fixed to the positioning blocks 52, which is used to abut the positioning blocks 52 against the movable rods 411 on the other drive rod 41.

[0039] Reference Figure 4 When the connecting cloth 32 is fully unfolded, the two connecting rods 31 meet. At this time, the driving rod 41 is moved upward in the mounting hole 311, causing the limiting block 422 to move out of the concave block 421. Then, the driving rod 41 is rotated so that the moving rods 411 on the two driving rods 41 cross each other. During this process, when the moving rod 411 of one driving rod 41 is inserted between the adjacent moving rods 411 on the other driving rod 41, the moving rod 411 will first abut against the side wall of the positioning block 52. Because the positioning block 52 is tilted, it is easy to push the positioning block 52 towards the positioning rod 51. The torsion spring 53 is deformed, that is, the positioning block 52 rotates about the positioning rod 51 as an axis.

[0040] When the moving rod 411 passes a positioning block 52, the torsion spring 53 on the positioning block 52 returns to its original deformation, causing the positioning block 52 to reset. At this time, the moving rod 411 is located on the other side of the positioning block 52. Under the restriction of the torsion spring 53, the moving rod 411 cannot move away and return, thus ensuring that the moving rod 411 is positioned at this point, that is, the connecting rod 31 on the two drive rods 41 is not easily separated, ensuring that the connecting cloth 32 remains in the unfolded state.

[0041] Reference Figure 3 and Figure 4 The inner wall of the plastic shell 10 has a receiving groove 11, into which both the connecting rod 31 and the drive rod 41 can be inserted. When the connecting cloth 32 is fully unfolded, connecting the sound-absorbing cotton 20 and the plastic shell 10, the two connecting rods 31 meet. At this time, both connecting rods 31 are inserted into the receiving groove 11, ensuring that there are no protrusions between the plastic shell 10 and the sound-absorbing cotton 20, thus guaranteeing the integrity of the sound-absorbing cotton 20 structure and making the sound-absorbing cotton 20 and the connecting cloth 32 fit more snugly. At the same time, the connecting rods 31 on the two drive rods 41 are interlaced, and then the drive rods 41 are moved down in the mounting rod until both the drive rods 41 and the moving rods 411 are inserted into the receiving groove 11, ensuring that there are no protrusions on the surface of the plastic shell 10, facilitating the subsequent installation and use of the motor housing.

[0042] Reference Figure 3A limiting hole 12 is provided on the inner wall of the receiving groove 11. A limiting rod 70 is inserted into the limiting hole 12. The limiting rod 70 can move in the limiting hole 12 and can pass through the receiving groove 11. A lever 60 is fixed on the side wall of the limiting rod 70. The lever 60 is perpendicular to the limiting rod 70. A moving hole 13 is provided on the end wall of the plastic shell 10. The moving hole 13 is connected to the limiting hole 12. The lever 60 is inserted in the moving hole 13 and can move in the moving hole 13. A fixing hole 14 is provided on the inner wall of the movable hole 13. A fixing block 80 is inserted into the fixing hole 14. A fixing spring 81 is provided in the fixing hole 14. One end of the fixing spring 81 is fixed to the inner wall of the fixing hole 14, and the other end is fixed to the fixing block 80. In the initial state, the limiting rod 70 is located in the limiting hole 12. At this time, the lever 60 is located in front of the fixing block 80, so that the fixing spring 81 is in a compressed state, and the fixing block 80 is completely housed in the fixing hole 14.

[0043] Reference Figure 3 When both the connecting rod 31 and the driving rod 41 are inserted into the receiving groove 11, the moving lever 60 is moved to drive part of the limiting rod 70 out of the moving hole 13 and through the entire receiving groove 11, so that the end opening of the receiving groove 11 is blocked, thereby preventing the driving rod 41 from moving out of the receiving groove 11, thus achieving the positioning of the driving rod 41 on the plastic shell 10.

[0044] At this time, the lever 60 also moves to the end of the moving hole 13, so that the lever 60 passes over the fixing block 80, so that the side wall of the fixing block 80 is unobstructed. Under the action of the fixing spring 81, the fixing block 80 is inserted into the moving hole 13, blocking the moving hole 13 behind the lever 60, so that the lever 60 has no room for reset movement, so that the lever 60 is fixed on the plastic shell 10, that is, the moving rod 411 cannot move, maintaining the state of blocking the opening of the receiving groove 11.

[0045] The implementation principle of the brushed motor noise reduction structure in this application embodiment is as follows: In the initial state, the connecting cloth 32 is wound around the connecting rod 31 with the adhesive side facing inward. During installation, the sound-absorbing cotton 20 is inserted into the plastic shell 10. Because the connecting component 30 protrudes from the inner wall of the plastic shell 10, the part of the sound-absorbing cotton 20 in contact with the connecting component 30 deforms, allowing the sound-absorbing cotton 20 to be fully inserted into the plastic shell 10. Then, the connecting rod 31 is rotated to gradually unfold the connecting cloth 32, so that the adhesive side of the connecting cloth 32 opens and faces the sound-absorbing cotton 20, thereby adhering the sound-absorbing cotton 20 to the connecting cloth 32. When the connecting cloth 32 is fully unfolded, the entire circumference of the connecting cloth 32 and the sound-absorbing cotton 20 are connected. Because the connecting cloth 32 is connected to the plastic shell 10, the sound-absorbing cotton 20 is also connected to the plastic shell 10, making the operation convenient and improving production efficiency.

[0046] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A noise reduction structure for a brushed motor, characterized in that, The device includes a plastic shell (10) and sound-absorbing cotton (20). The plastic shell (10) and the sound-absorbing cotton (20) are connected by two connecting components (30). The connecting components (30) include a connecting rod (31) and a connecting cloth (32). One end of the connecting cloth (32) is fixed to the inner wall of the plastic shell (10), and the other end is fixed to the connecting rod (31). The connecting cloth (32) is wrapped around the connecting rod (31), and the side of the connecting cloth (32) near the sound-absorbing cotton (20) is provided with glue. One end of the connecting rod (31) is provided with a driving assembly (40), the driving assembly (40) can extend out of the plastic shell (10), the driving assembly (40) includes a driving rod (41), the end wall of the connecting rod (31) is provided with a mounting hole (311), the driving rod (41) is inserted into the mounting hole (311) and can move along the length direction of the connecting rod (31) in the mounting hole (311), the driving rod (41) is connected to the connecting rod (31) through a limiting member (42); The inner wall of the plastic shell (10) is provided with a receiving groove (11), and the connecting rod (31) and the drive assembly (40) can both be inserted into the receiving groove (11); A limiting hole (12) is provided on the inner wall of the receiving groove (11). A limiting rod (70) is inserted into the limiting hole (12). The limiting rod (70) can move in the limiting hole (12) and can pass through the receiving groove (11). A lever (60) is fixed on the side wall of the limiting rod (70). The lever (60) is perpendicular to the limiting rod (70). A moving hole (13) is provided on the end wall of the plastic shell (10). The moving hole (13) is connected to the limiting hole (12). The lever (60) is inserted in the moving hole (13) and can move in the moving hole (13).

2. The brushed motor noise reduction structure according to claim 1, characterized in that, The connecting fabric (32) has a pile on the side away from the sound-absorbing cotton (20).

3. The brushed motor noise reduction structure according to claim 1, characterized in that, The limiting member (42) includes a concave block (421) and a limiting block (422). The concave block (421) is fixed on the inner wall of the mounting hole (311), and the limiting block (422) is fixed on the side wall of the drive rod (41). The limiting block (422) can be adapted to be inserted into the concave block (421).

4. The brushed motor noise reduction structure according to claim 1, characterized in that, The drive rod (41) extends out of the mounting hole (311) and a plurality of movable rods (411) are fixed on the side wall. The movable rods (411) are perpendicular to the drive rod (41).

5. The brushed motor noise reduction structure according to claim 4, characterized in that, The movable rods (411) on the two drive rods (41) can cross each other, and a positioning component (50) is provided on the movable rod (411) on one of the drive rods (41).

6. The brushed motor noise reduction structure according to claim 5, characterized in that, The positioning assembly (50) includes several positioning blocks (52) and several torsion springs (53). Several positioning rods (51) are fixed on the side wall of the moving rod (411). The positioning rods (51) are evenly distributed along the length of the moving rod (411). The positioning blocks (52) correspond one-to-one with the positioning rods (51). The positioning blocks (52) are sleeved on the positioning rods (51) and can rotate on the positioning rods (51) with the positioning rods (51) as the axis. The positioning blocks (52) are inclined towards the driving rod (41). The torsion springs (53) are sleeved on the positioning rods (51). One end of the torsion springs (53) is fixed to the positioning rods (51) and the other end is fixed to the positioning blocks (52), which is used to abut the positioning blocks (52) against the moving rods (411) on another driving rod (41).

7. The brushed motor noise reduction structure according to claim 1, characterized in that, A fixing hole (14) is provided on the inner wall of the movable hole (13). A fixing block (80) is inserted into the fixing hole (14). The fixing block (80) is connected to the inner wall of the movable hole (13) by a fixing spring (81). The fixing spring (81) is used to insert the fixing block (80) into the movable hole (13).

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