Motor commutator brush carrier
By using a carbon brush structure with a tension spring and a limiting part in the DC motor, the problems of carbon brush wear and spring breakage are solved, achieving stable carbon brush clamping and convenient replacement, thus improving the reliability and service life of the motor.
Patent Information
- Application Number
- CN202520910579.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-09
- Publication Date
- 2026-05-19
- Estimated Expiration
- 2035-05-09
AI Technical Summary
In existing DC motors, carbon brushes are pressed against the commutator by the spring force, resulting in severe wear. Furthermore, the springs are prone to breakage at high temperatures, affecting the stability of motor operation.
A tension spring is used in conjunction with a limiting part. The tension spring presses the carbon brush and adjusts its top pressure to avoid direct contact between the tension spring and the carbon brush. An insulating layer is set to prevent current transmission. The tension of the tension spring is adjusted by a knob. A limiting plate is designed to judge the degree of carbon brush wear so that it can be replaced.
It extends the lifespan of carbon brushes, reduces the risk of spring breakage, ensures stable motor operation, and simplifies the carbon brush replacement process.
Smart Images
Figure CN224264748U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of DC motor technology, specifically relating to a motor commutator brush holder. Background Technology
[0002] In existing technologies, the carbon brush holders of DC motors are mostly held against the commutator by the elasticity of coil springs. This results in two issues: firstly, the force exerted by the carbon brush against the commutator is relatively large, leading to faster wear of the carbon brush; secondly, during operation, the current passing through the carbon brush directly causes the carbon brush temperature to be high, which in turn is transmitted to the coil spring, causing the coil spring to be hot and prone to breakage when heated under elastic tension, leading to loosening of the carbon brush, which in turn affects the operation of the DC motor or even causes malfunction. Summary of the Invention
[0003] This invention addresses the problems in existing DC motor brush holders, where the brush holders are typically held against the commutator by spring tension. This results in two issues: firstly, the brushes are subject to excessive tension and are prone to wear; secondly, the springs in contact with the brushes are susceptible to breakage due to heat under stress, leading to motor malfunctions. The invention provides a motor commutator brush holder that utilizes a tension spring, making it less prone to breakage and allowing for adjustable brush pressure. Furthermore, the tension spring does not directly contact the brushes, facilitating brush replacement.
[0004] To achieve the above objectives, the technical solution of this utility model is as follows:
[0005] A motor commutator brush holder includes a mounting part and a limiting part; the mounting part includes a frame and a bracket fixed to one side of the frame, and a carbon brush is installed inside the frame; one end of the limiting part is hinged to the bracket, and a tension spring is also provided between the limiting part and the bracket; the other end of the limiting part contacts the end of the carbon brush away from the commutator, and the carbon brush is pressed against the side of the commutator by the tension spring in cooperation with the limiting part, and the distance between the tension spring and the carbon brush is increased to avoid the tension spring from overheating.
[0006] Preferably, the frame includes two fixedly connected cylinders, each cylinder containing a carbon brush. A bracket and a connecting part are fixedly connected to the two cylinders on opposite sides. The connecting part is used to connect to the motor. Each brush holder can simultaneously install two carbon brushes, ensuring current transmission efficiency when used with large motors.
[0007] Preferably, there are two brackets, and both brackets are connected to limiting parts, with the two limiting parts corresponding to the carbon brushes inside the two cylinders respectively.
[0008] Preferably, the carbon brush slides through the cylinder and contacts the commutator after passing through the corresponding cylinder.
[0009] Preferably, the limiting part includes a first vertical rod, a horizontal rod, and a second vertical rod. The two ends of one side of the horizontal rod are respectively connected to the first vertical rod and the second vertical rod. The end of the first vertical rod away from the horizontal rod is hinged to a bracket. The end of the second vertical rod away from the horizontal rod contacts the carbon brush and presses the carbon brush under the action of a tension spring.
[0010] Preferably, the end of the second vertical rod away from the horizontal rod is covered with an insulating layer, which contacts the carbon brush to prevent current from being transmitted to the tension spring through the limiting part.
[0011] Preferably, a screw is threaded through the crossbar. One end of the screw is connected to the bracket by a tension spring, and the other end passes through the crossbar and is threaded to a knob. By rotating the knob, the extension and retraction of the tension spring can be adjusted, thereby adjusting the tension of the tension spring and thus adjusting the clamping force on the carbon brush.
[0012] Preferably, a screw is provided at one end of the crossbar near the first vertical bar, so that the limiting part will not fall down again after the limiting part is lifted, which facilitates the replacement of carbon brushes.
[0013] Preferably, a limiting plate is fixedly connected to one end of the frame near the bracket. The limiting plate is located between the frame and the limiting part, and the need to replace the carbon brush is determined by the limiting plate.
[0014] Preferably, a handle is provided in the middle of the limiting part on the side away from the frame, so that the limiting part can be adjusted to press the carbon brush.
[0015] The beneficial effects of this utility model through the above technical solution are as follows:
[0016] 1. This utility model uses a tension spring and a limiting part to press the carbon brush toward the commutator. Since the tension spring does not directly contact the carbon brush, it avoids the risk of the tension spring breaking under stress due to excessive temperature.
[0017] 2. This utility model allows adjustment of the screw's axial movement by rotating the knob, thereby adjusting the distance between the two ends of the tension spring. This enables adjustment of the tension spring force when the carbon brush is pressed at the limiting part, thus avoiding excessive tension. On the one hand, this prevents severe wear of the carbon brush and extends its service life; on the other hand, it reduces the stress on the tension spring and lowers its risk of breakage.
[0018] 3. This utility model allows the limiting part to rotate by turning the handle, thereby adjusting the pressing or loosening of the carbon brush. After the limiting part loosens the carbon brush, it can be conveniently replaced or installed when it opens to a certain extent. After the new carbon brush is installed, the limiting part can be turned in the opposite direction by turning the handle again so that the end of the second vertical rod contacts the carbon brush to achieve the pressing of the carbon brush.
[0019] 4. This utility model prevents current from being transmitted to the tension spring through the limiting part by providing an insulating pad made of bakelite at the end of the second vertical rod, thus avoiding damage to the tension spring.
[0020] 5. By setting a limiting plate, this utility model requires the carbon brush to be replaced when the crossbar contacts the limiting plate during the use of the carbon brush. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 .
[0022] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 .
[0023] Figure 3 This is a schematic diagram of the structure of this utility model without carbon brushes installed.
[0024] Figure 4 This is a schematic diagram of the frame and support structure of this utility model.
[0025] Figure 5 This is a structural diagram showing the positional relationship between the carbon brush and the commutator when they are in contact.
[0026] The attached diagram is labeled as follows: 1 is the bracket, 2 is the carbon brush, 3 is the tension spring, 4 is the cylinder, 5 is the connecting part, 6 is the first vertical rod, 7 is the horizontal rod, 8 is the second vertical rod, 9 is the insulation layer, 10 is the screw, 11 is the knob, 12 is the limiting plate, and 13 is the handle. Detailed Implementation
[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:
[0028] like Figures 1-5 As shown, this embodiment provides a motor commutator brush holder, including a mounting part and a limiting part; the mounting part includes a frame and a bracket 1 fixed to one side of the frame, and a carbon brush 2 is installed inside the frame; specifically, the frame includes two fixedly connected cylinders 4, and a carbon brush 2 is installed inside each cylinder 4. The carbon brush 2 slides through the cylinder 4. One end of the limiting part is hinged to the bracket 1, and a tension spring 3 is also provided between the limiting part and the bracket 1. The other end of the limiting part contacts the end of the carbon brush 2 away from the commutator. Specifically, the tension of the tension spring 3 causes the end of the limiting part to press the carbon brush 2, thereby pressing the carbon brush 2 onto the commutator.
[0029] The two cylinders 4 are respectively fixedly connected to the bracket 1 and the connecting part 5 on the side away from each other. The connecting part 5 is used to connect the motor and is fixedly installed inside the motor by bolts.
[0030] Furthermore, the connecting part 5 consists of two L-shaped plates arranged opposite each other with a gap, forming a T-shaped through hole. During installation, multiple brush rods are fixedly installed inside the motor and arranged around the commutator. Each brush rod is equipped with multiple brush holders. The connecting part 5 is slidably sleeved on the corresponding brush rod inside the motor. After reaching the designated position, the bolts threaded through the brush rods press the connecting part 5 to fix the brush holders.
[0031] The bracket 1 is configured as two, and the two brackets 1 are located on the same side of the frame. Specifically, two brackets 1 are fixedly installed on the side of one of the cylinders 4 away from the other cylinder 4. The two brackets 1 are arranged side by side, and both brackets 1 are connected to limiting parts. The two limiting parts correspond to the carbon brushes 2 in the two cylinders 4 respectively.
[0032] The limiting part includes a first vertical rod 6, a horizontal rod 7, and a second vertical rod 8. The two ends of one side of the horizontal rod 7 are respectively connected to the first vertical rod 6 and the second vertical rod 8. The end of the first vertical rod 6 away from the horizontal rod 7 is hinged to the bracket 1. The end of the second vertical rod 8 away from the horizontal rod 7 contacts the carbon brush 2. The end of the second vertical rod 8 away from the horizontal rod 7 is covered with an insulating layer 9. The insulating layer 9 contacts the carbon brush 2. The insulating layer 9 is a layer structure made of bakelite to prevent the current on the carbon brush 2 from being transmitted through the limiting part.
[0033] A screw 10 is threaded through the crossbar 7. One end of the screw 10 is connected to the bracket 1 by a tension spring 3, and the other end passes through the crossbar 7 and is threaded to a knob 11. The screw 10 is threaded through the end of the crossbar 7 closest to the first vertical bar 6. A round rod is fixedly installed at the lower part of the bracket 1. The screw 10 and the round rod are respectively connected to the hanging rings or hooks at both ends of the tension spring 3. Figure 1 As shown, a handle 13 is provided in the middle of the limiting part on the side away from the frame. By moving the limiting part with the handle 13, it can be rotated clockwise. Figure 1 When the limit part is rotated clockwise, the limit part opens, allowing the carbon brush 2 to be installed or replaced. Then, the limit part is rotated counterclockwise, causing the insulating layer 9 at the end of the second vertical rod 8 to contact the end of the new carbon brush 2. Under the tension of the tension spring 3, the carbon brush 2 is pressed. Rotating the knob 11 causes the screw 10 to move along its axial direction (i.e., along the direction of the tension spring 3 or in the opposite direction), thereby adjusting the tension of the tension spring 3 to prevent the carbon brush 2 from having insufficient or excessive pressing force on the commutator.
[0034] A limiting plate 12 is fixedly connected to one end of the frame near the support 1. The limiting plate 12 is located between the frame and the limiting part. With the setting of the limiting plate 12, as the motor works, the carbon brush 2 wears down. Under the tension of the tension spring 3, the crossbar 7 gradually approaches the limiting plate 12. When the distance between the crossbar 7 and the limiting plate 12 is close to about 1 cm, the carbon brush 2 is replaced. If the carbon brush 2 continues to wear down, on the one hand, the elasticity of the tension spring 3 will basically disappear, and on the other hand, the carbon brush 2 will be worn excessively.
[0035] In use, first install the brush holder of this utility model through the connecting part 5, then open the limiting part through the handle 13, insert the carbon brush 2 into the cylinder 4, and then rotate the limiting part through the handle 13 again so that the insulating layer 9 at the end of the second vertical rod 8 contacts the carbon brush 2, and under the action of the tension spring 3, press the carbon brush 2 onto the commutator to complete the installation of the carbon brush 2.
[0036] As the motor operates, carbon brush 2 gradually wears down. Under the action of tension spring 3, carbon brush 2 still keeps pressing against the commutator. When the distance between the crossbar 7 and the limit plate 12 is close to about 1cm, carbon brush 2 is replaced.
[0037] It should be noted that after installation, the carbon brush 2 makes inclined contact with the side of the commutator. Specifically, there is a certain angle α between the length direction of the carbon brush 2 and the radial direction of the commutator, and the size of this angle α is 15-18° (e.g., ...). Figure 5 (As shown).
[0038] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.
Claims
1. A motor commutator brush holder, characterized in that, Includes the mounting section and the limiting section; The mounting part includes a frame and a bracket (1) fixed to one side of the frame, and a carbon brush (2) is installed inside the frame. One end of the limiting part is hinged to the bracket (1), and a tension spring (3) is also provided between the limiting part and the bracket (1). The other end of the limiting part contacts the end of the carbon brush (2) away from the commutator.
2. The motor commutator brush holder according to claim 1, characterized in that, The frame includes two fixedly connected cylinders (4), each cylinder (4) is equipped with a carbon brush (2), and the two cylinders (4) are fixedly connected to a bracket (1) and a connecting part (5) on opposite sides, respectively. The connecting part (5) is used to connect a motor.
3. A motor commutator brush holder according to claim 2, characterized in that, The bracket (1) is configured as two, and both brackets (1) are connected to limiting parts, and the two limiting parts correspond to the carbon brushes (2) in the two cylinders (4) respectively.
4. A motor commutator brush holder according to claim 2, characterized in that, The carbon brush (2) slides through the cylinder (4).
5. A motor commutator brush holder according to claim 1, characterized in that, The limiting part includes a first vertical rod (6), a horizontal rod (7), and a second vertical rod (8). The two ends of one side of the horizontal rod (7) are respectively connected to the first vertical rod (6) and the second vertical rod (8). The end of the first vertical rod (6) away from the horizontal rod (7) is hinged to the bracket (1), and the end of the second vertical rod (8) away from the horizontal rod (7) contacts the carbon brush (2).
6. A motor commutator brush holder according to claim 5, characterized in that, The end of the second vertical rod (8) away from the horizontal rod (7) is covered with an insulating layer (9), which contacts the carbon brush (2).
7. A motor commutator brush holder according to claim 5, characterized in that, A screw (10) is threaded through the crossbar (7). One end of the screw (10) is connected to the bracket (1) by a tension spring (3), and the other end passes through the crossbar (7) and is threaded to a knob (11).
8. A motor commutator brush holder according to claim 1, characterized in that, A limiting plate (12) is fixedly connected to one end of the frame near the support (1), and the limiting plate (12) is located between the frame and the limiting part.
9. A motor commutator brush holder according to claim 1, characterized in that, A handle (13) is provided in the middle of the limiting part on the side away from the frame.