Brushed motor with wear-free brush

Abstract

The utility model belongs to motor technical field, concretely is a kind of metal brush motor with wear-preventing electric brush, including casing, end cover, rotor shaft, rotor group, stator core and brush assembly, the stator core is fixed in casing interior, the rotor group is sleeved on rotor shaft and located stator core inside side, the commutator is equipped on the rotor group, the brush assembly includes brush holder, two groups of elastic sheet, wear-resistant alloy block, elastic silica gel cover and sliding shaft, the brush holder is connected with end cover, the sliding shaft is movably arranged on elastic sheet, the elastic silica gel cover is sleeved on the outside of sliding shaft, the wear-resistant alloy block is fixed at the end of sliding shaft away from elastic silica gel cover, and wear-resistant alloy block and commutator on the rotor group are adapted to contact, elastic silica gel cover provides continuous axial thrust, can be automatically compensated after wearing, avoid poor contact, prevent motor abnormal sound, speed fluctuation, improve operating reliability.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a metal brush motor with wear-resistant brushes. Background Technology

[0002] In the use of traditional metal brush motors, the brushes, as key components for transmitting current, need to maintain continuous contact with the commutator on the rotor assembly and slide relative to it. Long-term friction can easily lead to significant wear on the brushes themselves.

[0003] Due to the lack of targeted anti-wear design and wear compensation mechanisms in existing motor structures: on the one hand, the contact parts between the brush and the commutator are mostly made of a single carbon brush material, which has insufficient wear resistance. Frequent friction will quickly shorten the service life of the brush, requiring regular disassembly and replacement, increasing maintenance costs and downtime; on the other hand, even if some motors are equipped with a simple elastic structure, it is difficult to accurately maintain stable contact between the brush and the commutator. As the wear of the brush increases, the contact pressure between the two will gradually decrease, which can easily lead to poor contact and unstable current conduction, resulting in abnormal noise and speed fluctuations in motor operation, affecting the overall reliability and safety of motor operation. Therefore, we propose a metal brush motor with brush wear protection. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a metal brush motor with wear-resistant brushes, thus solving the problems mentioned below.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A metal brush motor with wear-resistant brushes includes a housing, an end cover, a rotor shaft, a rotor assembly, a stator core, and a brush assembly. The stator core is fixed inside the housing, the rotor assembly is sleeved on the rotor shaft and located inside the stator core, and the rotor assembly is provided with a commutator. The brush assembly includes a brush holder, two sets of elastic plates, a wear-resistant alloy block, an elastic silicone sleeve, and a sliding shaft. The brush holder is connected to the end cover. The sliding shaft is movably mounted on the elastic plates. The elastic silicone sleeve is fitted on the outside of the sliding shaft. The wear-resistant alloy block is fixed to the end of the sliding shaft away from the elastic silicone sleeve, and the wear-resistant alloy block is adapted to contact the commutator on the rotor assembly.

[0006] Preferably, it also includes two sets of retainers, the retainers are fixed to the housing, the elastic sheet is disposed inside the retainer, the retainer has an opening, and the sliding shaft is located in the opening.

[0007] Preferably, two sets of symmetrically distributed mounting blocks are fixedly connected to the brush holder by screws, and a connecting piece is fixedly connected to the elastic sheet, with the connecting piece sandwiched between the corresponding mounting block and the brush holder.

[0008] Preferably, the mounting block, brush holder, and connector are fixedly connected by screws.

[0009] Preferably, the end cover has an installation port, the brush holder is snapped into the installation port, a plurality of first connecting blocks are fixedly connected to the outer surface of the end cover, and a plurality of second connecting blocks are fixedly connected to the outer surface of the housing, the first connecting blocks and the second connecting blocks are fixedly connected by screws.

[0010] Preferably, the outer side of the brush holder is provided with a positioning hole, and the inner side of the end cover is fixed with a positioning shaft, which is adapted to be inserted into the positioning hole.

[0011] Preferably, a limiting block is fixedly connected to the end of the slide shaft away from the wear-resistant alloy block.

[0012] Preferably, the connector has a wiring hole.

[0013] This invention provides a metal brush motor with wear-resistant brushes. Compared with the prior art, it has the following advantages: 1. Improve the wear resistance of the brush and extend its service life: The wear-resistant alloy block contacts the commutator, which has better wear resistance than traditional carbon brushes, reducing friction loss and lowering the frequency of brush replacement and maintenance costs.

[0014] 2. Ensure stable contact between the brush and the commutator: The elastic silicone sleeve provides continuous axial thrust, which can automatically compensate after wear, avoid poor contact, prevent abnormal motor noise and speed fluctuations, and improve operational reliability.

[0015] 3. Stable structure and convenient assembly: The retainer prevents the elastic plate from tilting up, and the limit block prevents the anti-slip shaft from coming off; the brush holder is positioned by the positioning shaft, and the end cover and the housing are quickly fixed by the connecting block, so the overall structure has no displacement during operation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of the present utility model. Figure 1 ; Figure 2 This is a schematic diagram of the main structure of the present utility model. Figure 2 ; Figure 3 This is a schematic diagram of the main body disassembled structure of this utility model; Figure 4 This is a schematic diagram of the connection structure between the end cap and the brush assembly of this utility model; Figure 5 This is a schematic diagram of the disassembled structure of the end cap and brush assembly of this utility model; Figure 6 This is a schematic diagram of the disassembled structure of the brush assembly of this utility model.

[0017] In the diagram: 1. Housing; 2. End cover; 3. First connecting block; 4. Second connecting block; 5. Rotor shaft; 6. Mounting port; 7. Positioning shaft; 8. Brush assembly; 9. Rotor group; 10. Stator core; 11. Through port; 12. Cage; 13. Limiting block; 14. Brush holder; 15. Connecting piece; 16. Positioning socket; 17. Mounting block; 18. Elastic sheet; 19. Wear-resistant alloy block; 20. Elastic silicone sleeve; 21. Sliding shaft. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-6 This utility model provides a technical solution: a metal brush motor with wear-resistant brushes, including a housing 1, an end cover 2, a rotor shaft 5, a rotor assembly 9, a stator core 10, and a brush assembly 8. The stator core 10 is fixed inside the housing 1, the rotor assembly 9 is sleeved on the rotor shaft 5 and located inside the stator core 10, and a commutator is provided on the rotor assembly 9. The brush assembly 8 includes a brush holder 14, two sets of elastic plates 18, a wear-resistant alloy block 19, an elastic silicone sleeve 20, and a sliding shaft 21. The brush holder 14 is connected to the end cover 2. The sliding shaft 21 is movably mounted on the elastic plates 18. The elastic silicone sleeve 20 is fitted on the outside of the sliding shaft 21. The wear-resistant alloy block 19 is fixed to the end of the sliding shaft 21 away from the elastic silicone sleeve 20, and the wear-resistant alloy block 19 is adapted to contact the commutator on the rotor assembly 9.

[0020] It also includes two sets of retainers 12, which are fixed to the housing 1. The elastic sheet 18 is located inside the retainer 12. The retainer 12 has an opening 11, and the sliding shaft 21 is located in the opening 11. The retainer 12 can limit the elastic sheet 18 to prevent the elastic sheet 18 from tilting outward after long-term use.

[0021] Two sets of symmetrically distributed mounting blocks 17 are fixedly connected to the brush holder 14 by screws. A connecting piece 15 is fixedly connected to the elastic sheet 18, and the connecting piece 15 is clamped between the corresponding mounting block 17 and the brush holder 14.

[0022] The mounting block 17, brush holder 14 and connector 15 are fixedly connected by screws. The mounting block 17 can clamp and position the connector 15 and elastic piece 18.

[0023] The end cover 2 has an installation port 6, and the brush holder 14 is snapped into the installation port 6. Several first connecting blocks 3 are fixedly connected to the outer surface of the end cover 2, and several second connecting blocks 4 are fixedly connected to the outer surface of the housing 1. The first connecting blocks 3 and the second connecting blocks 4 are fixedly connected by screws. By connecting the first connecting blocks 3 and the second connecting blocks 4, the end cover 2 and the housing 1 can be easily positioned and installed.

[0024] The brush holder 14 is provided with a positioning hole 16 on the outside and a positioning shaft 7 is fixed on the inside of the end cover 2. The positioning shaft 7 is adapted to be inserted into the positioning hole 16 for preliminary positioning of the brush holder 14. After the housing 1 is connected to the end cover 2, the brush holder 14 can be clamped and then fixed.

[0025] A limiting block 13 is fixedly connected to the end of the slide shaft 21 away from the wear-resistant alloy block 19 to limit the slide shaft 21 and prevent it from detaching.

[0026] The connector 15 has a wiring hole for easy connection of external wires.

[0027] Working principle: External current is connected through the wiring hole of the terminal block 15, and conducted to the slide shaft 21 through the elastic plate 18. Finally, it is transmitted to the commutator of the rotor group 9 through the wear-resistant alloy block 19 at the end of the slide shaft 21. After the current flows through the winding of the rotor group 9, it generates electromagnetic force in the fixed magnetic field formed by the stator core 10 inside the housing 1, which drives the rotor group 9 to rotate the rotor shaft 5, converting electrical energy into mechanical energy.

[0028] Among them, the wear-resistant alloy block 19 is in direct contact with the commutator. Its material has better wear resistance than traditional carbon brushes, which can reduce the loss caused by friction and extend the overall service life of the brush assembly 8. The elastic silicone sleeve 20 on the outside of the slide shaft 21 is always in a slightly compressed state. It applies an axial thrust toward the commutator to the slide shaft 21 through its own elastic force, ensuring that the wear-resistant alloy block 19 and the commutator are in continuous close contact. When the wear-resistant alloy block 19 becomes thin due to long-term friction and wear, the elastic silicone sleeve 20 releases the compression amount to compensate for the wear amount in real time and avoid poor contact.

[0029] The retainer 12 is fixed to the housing 1 and constrains the elastic sheet 18 on its inner side. The retainer 12 is used to prevent the elastic sheet 18 from tilting outward, and the opening 11 is used to avoid affecting the operation of the slide shaft 21. A limiting block 13 is provided at the end of the slide shaft 21 away from the wear-resistant alloy block 19 to prevent the slide shaft 21 from extending excessively due to the thrust of the elastic silicone sleeve 20. At the same time, the brush holder 14 is adapted to the positioning hole 16 of the end cover 2 through the positioning shaft 7, and the end cover 2 and the housing 1 are fixed through the first connecting block 3 and the second connecting block 4 to ensure that the overall structure does not shift during motor operation, further ensuring transmission and contact stability.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Although 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 alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A metal brush motor with wear-resistant brushes, comprising a housing (1), an end cover (2), a rotor shaft (5), a rotor assembly (9), a stator core (10), and a brush assembly (8), characterized in that: The stator core (10) is fixed inside the housing (1), the rotor assembly (9) is sleeved on the rotor shaft (5) and located inside the stator core (10), and the rotor assembly (9) is provided with a commutator; The brush assembly (8) includes a brush holder (14), two sets of elastic plates (18), a wear-resistant alloy block (19), an elastic silicone sleeve (20), and a sliding shaft (21). The brush holder (14) is connected to the end cover (2). The sliding shaft (21) is movably mounted on the elastic plate (18). The elastic silicone sleeve (20) is fitted on the outside of the sliding shaft (21). The wear-resistant alloy block (19) is fixed to the end of the sliding shaft (21) away from the elastic silicone sleeve (20), and the wear-resistant alloy block (19) is adapted to contact the commutator on the rotor assembly (9).

2. A metal brush motor with wear-resistant brushes according to claim 1, characterized in that: It also includes two sets of retainers (12), the retainers (12) are fixed on the housing (1), the elastic sheet (18) is located inside the retainer (12), the retainer (12) has a through opening (11), and the sliding shaft (21) is located in the through opening (11).

3. A metal brush motor with wear-resistant brushes according to claim 1, characterized in that: Two sets of symmetrically distributed mounting blocks (17) are fixedly connected to the brush holder (14) by screws. A connecting piece (15) is fixedly connected to the elastic sheet (18). The connecting piece (15) is sandwiched between the corresponding mounting block (17) and the brush holder (14).

4. A metal brush motor with wear-resistant brushes according to claim 3, characterized in that: The mounting block (17), brush holder (14) and connector (15) are fixedly connected by screws.

5. A metal brush motor with wear-resistant brushes according to claim 1, characterized in that: The end cap (2) has an installation port (6), the brush holder (14) is installed in the installation port (6), a number of first connecting blocks (3) are fixedly connected to the outer surface of the end cap (2), and a number of second connecting blocks (4) are fixedly connected to the outer surface of the housing (1). The first connecting blocks (3) and the second connecting blocks (4) are fixedly connected by screws.

6. A metal brush motor with wear-resistant brushes according to claim 1, characterized in that: The brush holder (14) has a positioning hole (16) on the outside, and a positioning shaft (7) is fixed on the inside of the end cover (2). The positioning shaft (7) is adapted to be inserted into the positioning hole (16).

7. A metal brush motor with wear-resistant brushes according to claim 1, characterized in that: The end of the slide shaft (21) away from the wear-resistant alloy block (19) is fixedly connected to a limiting block (13).

8. A metal brush motor with wear-resistant brushes according to claim 3, characterized in that: The connector (15) has a wiring hole.

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