Low-noise miniature headrest motor carbon brush holder assembly

Abstract

The utility model relates to the technical field of motor carbon brush holders, and discloses a low-noise miniature headrest motor carbon brush holder assembly, which comprises a carbon brush holder body and is characterized in that the bottom of the carbon brush holder body is connected with a circuit board, the surface of the circuit board is electrically connected with a connecting terminal, the top end of the connecting terminal is connected with a support, and the support is connected with a motor. And a Hall element is fixedly connected to the surface of the connecting terminal and is electrically connected to the surface of the circuit board. According to the utility model, the brush arm is improved, under the bending action of the brush arm, the use of the carbon brush is not influenced under the condition that the angle of the brush arm is reduced, the problems that in the working process of the motor, the carbon brush is contacted to form abrasion and the swing angle of the brush arm becomes inward gradually after the carbon brush is abraded are solved, the service life of the carbon brush is greatly prolonged, and the service life of the carbon brush is prolonged. And moreover, the brush arm is bent, and the damping strip is embedded at the bent part, so that the noise is effectively reduced by the damping strip in the motor, and the use of the headrest motor in the automobile headrest is greatly facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of motor carbon brush holders, and specifically relates to a low-noise micro headrest motor carbon brush holder assembly. Background Technique

[0002] The functions of an automotive seat headrest mainly include two aspects. One is to make the head and neck more comfortable and relieve fatigue; the other is to play a safety protection role, and the latter is particularly important. The role of the automotive headrest is the same as that of the airbag, both for protecting the safety of the driver and passengers. In current technologies, the headrest is usually installed on the pillar by using latches and locking elements, and these latches and locking elements enable the headrest to be manually adjusted relative to the seat backrest. More modern headrest systems may include a headrest motor to facilitate adjustment.

[0003] The noise reduction standard for automotive seat headrests generally follows GB7258-2017 "Motor Vehicle Operating Safety Technical Conditions". This standard stipulates that the noise level beside the driver's ear should not be greater than 90 dB. Although GB7258-2017 mainly targets the noise level of the whole vehicle, as the seat is the part with the largest contact area inside the vehicle, its noise reduction performance has a direct impact on the riding experience. Therefore, automotive manufacturers usually conduct additional noise reduction treatments on the seat to ensure that no noise is generated when passengers sit down or move. This can improve the overall riding comfort. For passenger cars with less than 6 seats, the noise level beside the ear is generally between 40 dB (for pure electric vehicles) and 70 dB (for fuel vehicles), and the noise level within this range is considered an acceptable general level.

[0004] In a headrest motor, the carbon brush holder is an important component of the headrest motor. The role of the carbon brush holder is to apply pressure to the carbon brush that slides and contacts the surface of the commutator or slip ring through a spring, so as to stably conduct current between the fixed body and the rotating body. For the motor, both the brush holder and the carbon brush are very important components.

[0005] Existing headrest motors usually directly use a motor for driving. However, the automotive headrest motor is close to the ear during use, and the existing carbon brush holders cannot meet the low-noise effect, which affects the user's comfort. Moreover, during the operation of the motor, the contact of the carbon brush will cause wear. After the carbon brush wears, the swing angle of the brush arm becomes more and more inward, so that the carbon brush will fall off after long-term use, affecting the conductive effect of the carbon brush and reducing the service life of the headrest motor. Content of the Utility Model

[0006] In view of the deficiencies of the prior art, the utility model provides a low-noise micro headrest motor carbon brush holder assembly, which solves the problems mentioned in the above background.

[0007] The utility model provides the following technical solution: a low-noise miniature headrest motor carbon brush holder assembly, comprising: a carbon brush holder frame, and further comprising: a circuit board connected to the bottom of the carbon brush holder frame, a connection terminal electrically connected to the surface of the circuit board, a bracket connected to the top of the connection terminal, a Hall sensor fixedly connected to the surface of the connection terminal, and the Hall sensor electrically connected to the surface of the circuit board;

[0008] The middle part of the carbon brush holder is fixedly connected to a bearing, and a plurality of carbon brush blocks are arranged on the periphery of the bearing. Brush arms are inserted into the outer walls of the plurality of carbon brush blocks, and the brush arms are fixedly mounted on the surface of the carbon brush holder;

[0009] The upper and lower ends of the brush arm are bent structures, and the outer wall of the bent structure is embedded with a damping strip.

[0010] Furthermore, the brush arms include a first brush arm and a second brush arm, and carbon brush blocks are inserted into the interiors of the first brush arm and the second brush arm.

[0011] Furthermore, the installation angle between the central axis of the carbon brush block and the brush arm is 90°±2°.

[0012] Furthermore, the spring rebound force of the carbon brush block is greater than 0.22N.

[0013] Furthermore, an overcurrent protector is provided between the two brush arms, and the overcurrent protector is electrically connected to the bottom end of the circuit board, and the overcurrent protector is fixedly connected to the carbon brush holder frame.

[0014] Furthermore, the bottom end of the circuit board is also connected to a grounding wire, and the grounding wire is installed on the surface of the carbon brush holder.

[0015] Furthermore, a plurality of the brackets are provided, and the brackets are arranged in parallel at the bottom of the carbon brush holder body, and are vertically distributed between the carbon brush holder body and the connecting terminals.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] In the utility model, by improving the brush arm, the brush arm is bent so that the use of the carbon brush is not affected when the angle of the brush arm is reduced, thereby avoiding the problem that the carbon brush contact will cause wear during the operation of the motor, and the swing angle of the brush arm becomes increasingly inward after the carbon brush is worn, thereby greatly extending the service life of the carbon brush. In addition, by bending the brush arm and embedding a damping strip at the bending position, the damping strip can effectively reduce noise inside the motor, greatly facilitating the use of the headrest motor in the car headrest. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of a low-noise miniature headrest motor carbon brush holder assembly of the utility model;

[0019] Figure 2 This is a front view of the bottom structure of a low-noise micro headrest motor carbon brush holder assembly in the present utility model;

[0020] Figure 3 This is a front view of the surface structure of a low-noise micro headrest motor carbon brush holder assembly in the present utility model;

[0021] Figure 4 This is a sectional view of a low-noise micro headrest motor carbon brush holder assembly in the present utility model;

[0022] Figure 5 This is an exploded view of a low-noise micro headrest motor carbon brush holder assembly in the present utility model.

[0023] In the figure: 1. Carbon brush holder body; 2. Connection terminal; 3. Bracket; 4. Circuit board; 5. Hall; 6. Bearing; 7. Carbon brush block; 8. First brush arm; 9. Grounding wire; 10. Second brush arm; 11. Damping strip; 12. Overcurrent protector. Specific embodiments

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0025] Please refer to Figures 1-5 , a low-noise micro headrest motor carbon brush holder assembly, comprising: a carbon brush holder body 1, a connection terminal 2, a bracket 3, a circuit board 4, a Hall 5, a bearing 6, a carbon brush block 7, a first brush arm 8, a grounding wire 9, a second brush arm 10, a damping strip 11 and an overcurrent protector 12. It further includes: a circuit board 4 is connected to the bottom of the carbon brush holder body 1, and the bottom end of the circuit board 4 is fixedly connected to the surface of the carbon brush holder body 1. A connection terminal 2 is electrically connected to the surface of the circuit board 4. The top end of the connection terminal 2 is connected to a bracket 3. There are multiple brackets 3, and the brackets 3 are arranged in parallel at the bottom of the carbon brush holder body 1. The carbon brush holder body 1 and the connection terminal 2 are vertically distributed, which is convenient for the stable installation of the carbon brush holder assembly. A Hall 5 is fixedly connected to the surface of the connection terminal 2, and the Hall 5 is electrically connected to the surface of the circuit board 4. The bottom end of the circuit board 4 is also connected to a grounding wire 9, and the grounding wire 9 is installed on the surface of the carbon brush holder body 1. The grounding wire 9 is connected to the connection terminal 2 and is stably installed through bending in the notch on the surface of the carbon brush holder body 1, and is fixed by tin soldering at the same time, ensuring the working safety of the motor;

[0026] Furthermore, a bearing 6 is fixedly connected to the middle of the carbon brush holder body 1. In order to reduce the wear of the carbon brushes during operation of the motor, two carbon brush blocks 7 are provided on the outer periphery of the bearing 6. Specifically, the outer walls of the two carbon brush blocks 7 are plugged with brush arms, and the brush arms are fixedly installed on the surface of the carbon brush holder body 1, wherein the brush arms are the first brush arm 8 and the second brush arm 10, and the interiors of the first brush arm 8 and the second brush arm 10 are both plugged with carbon brush blocks 7. During installation, the carbon brush block 7 is assembled into the mating surface close to the carbon brush swing arm, and the brush arms are pressed into the corresponding slots on the surface of the carbon brush holder body 1. Tightly clamp the bottom surface to keep the two carbon brush blocks 7 at the same height. Specifically, the installation angle between the central axis of the carbon brush block 7 and the brush arm is 90°, and the installation error does not exceed 2°, and the spring rebound force of the carbon brush block 7 is >0.22N, ensuring the service life of the carbon brush block 7. Through such an arrangement, it is ensured that the use of the carbon brush block 7 is not affected when the angle of the brush arm is reduced, which is beneficial to extending the service life of the carbon brush block 7. At the same time, the upper and lower ends of the brush arm are bent, and the outer wall of the bent structure is embedded with a damping strip 11. By arranging the damping strip 11 at the bending position, the noise can be effectively reduced.

[0027] An overcurrent protector 12 is provided between the two brush arms, and the overcurrent protector 12 is electrically connected to the bottom end of the circuit board 4. Specifically, the model of the overcurrent protector 12 is LPH1300F, which ensures the safety of the circuit board 4. It has a compact structure and strong practicality. In addition, considering the installation stability of the overcurrent protector 12, the overcurrent protector 12 is fixedly connected to the carbon brush holder frame 1.

[0028] Working principle: When in use, press the bearing 6 into the carbon brush holder frame 1, so that the bearing 6 is fixed in the middle of the carbon brush holder frame 1. At the same time, assemble the connecting terminal 2 and the bracket 3, and plug the Hall 5 and the connecting terminal 2 for installation. By stably connecting the connecting terminal 2 and the circuit board 4, the Hall 5 and the circuit board 4 are fixed, and the Hall 5 and the circuit board 4 are stably connected by tinning. Then, the circuit board 4 and the connecting terminal 2 are installed at the specified position at the bottom of the carbon brush holder frame 1. On the surface of the carbon brush holder frame 1, the two carbon brush blocks 7 are respectively plugged into the inside of the first brush arm 8 and the second brush arm 10, and the two carbon brush blocks are connected. 7 are kept at the same height. Through such an arrangement, the main shaft of the motor rotor is located in the middle of the two carbon brush blocks 7, and the two carbon brush blocks 7 are spread apart to ensure the working effect of the carbon brush blocks 7. Taking into account the noise reduction effect of the motor, damping strips 11 are installed on the outer walls of the first brush arm 8 and the second brush arm 10. Through the setting of the damping strips 11, the noise inside the motor is effectively reduced. At the same time, the grounding wire 9 is connected to the connecting terminal 2 and stably installed with the notch on the surface of the carbon brush holder frame 1 by bending. At the same time, it is fixed by tinning and welding to ensure the working safety of the motor. In this way, the working principle of the low-noise micro headrest motor carbon brush holder assembly is completed.

[0029] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-noise miniature headrest motor carbon brush holder assembly, comprising: The carbon brush holder frame (1) is characterized in that it further comprises: the bottom of the carbon brush holder frame (1) is connected to a circuit board (4), and the surface of the circuit board (4) is electrically connected to a connecting terminal (2), the top of the connecting terminal (2) is connected to a bracket (3), and the surface of the connecting terminal (2) is fixedly connected to a Hall (5), and the Hall (5) is electrically connected to the surface of the circuit board (4); A bearing (6) is fixedly connected to the middle of the carbon brush holder frame (1), and a plurality of carbon brush blocks (7) are provided on the periphery of the bearing (6), and brush arms are inserted into the outer walls of the plurality of carbon brush blocks (7), and the brush arms are fixedly mounted on the surface of the carbon brush holder frame (1); The upper and lower ends of the brush arm are in a bent structure, and a damping strip (11) is embedded in the outer wall of the bent structure.

2. The low-noise miniature headrest motor carbon brush holder assembly according to claim 1, characterized in that: The brush arms are a first brush arm (8) and a second brush arm (10), and carbon brush blocks (7) are inserted into the interiors of the first brush arm (8) and the second brush arm (10).

3. The low-noise miniature headrest motor carbon brush holder assembly according to claim 2, characterized in that: The installation angle between the central axis of the carbon brush block (7) and the brush arm is 90°±2°.

4. The low-noise miniature headrest motor carbon brush holder assembly according to claim 3, characterized in that: The spring rebound force of the carbon brush block (7) is greater than 0.22N.

5. The low-noise miniature headrest motor carbon brush holder assembly according to claim 1, characterized in that: An overcurrent protector (12) is provided between the two brush arms, and the overcurrent protector (12) is electrically connected to the bottom end of the circuit board (4), and the overcurrent protector (12) is fixedly connected to the carbon brush holder frame (1).

6. The low-noise miniature headrest motor carbon brush holder assembly according to claim 5, characterized in that: The bottom end of the circuit board (4) is also connected to a grounding wire (9), and the grounding wire (9) is installed on the surface of the carbon brush holder body (1).

7. The low-noise miniature headrest motor carbon brush holder assembly according to claim 1, characterized in that: A plurality of brackets (3) are provided, and the brackets (3) are arranged in parallel at the bottom of the carbon brush holder frame (1), and are vertically distributed between the carbon brush holder frame (1) and the connecting terminal (2).

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