Composite carbon brush of brush motor

Abstract

The utility model discloses a composite carbon brush of a brush motor, which relates to the technical field of electric brushes and comprises a shell and a lead, and a conducting layer is wrapped in the shell. The shell is a polymer engineering plastic layer, the conducting layer is wrapped in the shell, and the conducting layer is connected with the wire; the ends, close to the commutator, of the polymer engineering plastic layer and the conductive layer are provided with vertical sections, and the end, close to the commutator, of the conductive layer is provided with a plurality of conductive contacts. The composite carbon brush provided by the utility model adopts a composite structure in a'sandwich 'form, and the polymer engineering plastic layer, the polymer silver-nickel material layer and the polymer carbon-based material layer are used, so that the composite carbon brush not only has good wear resistance, conductivity and elasticity, but also can prolong the service life; in addition, the noise is lower in the process of being in contact with the commutator, namely, the mute effect is achieved.

Description

Technical Field

[0001] This utility model relates to the field of brush technology, and in particular to a composite carbon brush for a brushed motor. Background Technology

[0002] Brushes are an essential component of electric motors, responsible for conducting current between rotating and stationary parts. Because they are often made of graphite, they are also called carbon brushes. Brushes are typically mounted on commutators or slip rings and are sliding contact elements with characteristics such as smoothness, wear resistance, and good conductivity. Depending on the application, they may be partially metal components (copper, silver, molybdenum) or entirely made of metal. In practical use, a slip ring is usually equipped with at least two brushes to prevent an open circuit due to poor contact from a single brush.

[0003] Existing brushes are mostly made of graphite, hence the name carbon brushes. The structure and material of existing brushes are relatively simple, making them prone to wear and reducing their service life. In addition, the large contact area between the brush and the commutator during operation results in significant noise. Therefore, this invention proposes a composite carbon brush for brushed motors. Utility Model Content

[0004] The purpose of this invention is to address the deficiencies in the existing technology by proposing a composite carbon brush for a brushed motor.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A composite carbon brush for a brushed motor includes a housing and wires, wherein the housing is encased in a conductive layer.

[0007] The outer shell is a polymer engineering plastic layer, which encapsulates a conductive layer inside, and the conductive layer is connected to the wire;

[0008] Both the polymer engineering plastic layer and the conductive layer have vertical cross-sections at the end near the commutator, and the conductive layer has multiple conductive contacts at the end near the commutator.

[0009] The inner side of the polymer carbon-based material layer is wrapped with a polymer silver-nickel material layer, and the outer side of the polymer carbon-based material layer is wrapped with a polymer engineering plastic layer. The ends of the polymer engineering plastic layer, the polymer silver-nickel material layer, and the polymer carbon-based material layer that are in contact with the commutator are all provided with vertical cross sections.

[0010] Furthermore, the conductive layer includes a polymer silver-nickel material layer and a polymer carbon-based material layer. The polymer engineering plastic layer is wrapped around the outside of the polymer silver-nickel material layer, and the polymer silver-nickel material layer is wrapped around the outside of the polymer carbon-based material layer. The polymer silver-nickel material layer has multiple conductive contacts at one end near the commutator.

[0011] Further, the vertical cross-section of the polymer carbon-based material layer is in a "hui" character-shaped structure or a "Z" character-shaped structure.

[0012] Further, the conductive layer includes a polymer silver-nickel material layer and a polymer carbon-based material layer. The polymer engineering plastic layer is wrapped outside the polymer carbon-based material layer, and the polymer carbon-based material layer is wrapped outside the polymer silver-nickel material layer. A plurality of conductive contacts are provided at one end of the polymer carbon-based material layer close to the commutator.

[0013] Further, the vertical cross-section of the polymer silver-nickel material layer is in a "hui" character-shaped structure or a "Z" character-shaped structure.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] The composite carbon brush of the present utility model adopts a composite structure in the form of a "sandwich". The use of the polymer engineering plastic layer, the polymer silver-nickel material layer and the polymer carbon-based material layer enables the composite carbon brush to not only have good wear resistance, conductivity and elasticity, and can extend the service life, but also have lower noise during the process of contacting and using with the commutator, that is, it has a silent effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model, and do not constitute a limitation to the present utility model.

[0017] Figure 1 It is a schematic diagram of the overall structure of Embodiment 1 of the present utility model;

[0018] Figure 2 It is a schematic diagram of the structure when the polymer carbon-based material layer in Embodiment 1 adopts a "Z" character-shaped cross-section;

[0019] Figure 3 It is a schematic diagram of the overall structure of Embodiment 2 of the present utility model;

[0020] Figure 4 It is a schematic diagram of the structure when the polymer silver-nickel material layer in Embodiment 1 adopts a "Z" character-shaped cross-section

[0021] Figure 5 It is an assembly schematic diagram of the composite carbon brush and the commutator of the present utility model.

[0022] In the figure: 1 polymer engineering plastic layer, 10 conductive layer, 100 conductive contacts, 2 polymer silver-nickel material layer, 3 polymer carbon-based material layer, 4 wire, and 5 commutator. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] 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;

[0024] Embodiment 1 [[ID=][4]

[0025] Refer to Figure 1-2 , a composite carbon brush for a brushed motor, including a housing, a wire 4, and a conductive layer 10 is wrapped inside the housing;

[0026] The housing is a polymer engineering plastic layer 1, and the conductive layer 10 is wrapped inside it. The conductive layer 10 is connected to the wire 4;

[0027] Both the polymer engineering plastic layer 1 and the conductive layer 10 are provided with vertical cross-sections at one end close to the commutator 5, and the conductive layer 10 is provided with a plurality of conductive contacts 100 at one end close to the commutator 5.

[0028] The inner side of the polymer carbon-based material layer 3 is wrapped with a polymer silver-nickel material layer 2, the outer side of the polymer carbon-based material layer 3 is wrapped with a polymer engineering plastic layer 1, and vertical cross-sections are provided at one end of the polymer engineering plastic layer 1, the polymer silver-nickel material layer 2, and the polymer carbon-based material layer 3 in contact with the commutator.

[0029] In this Embodiment 1, the conductive layer 10 includes a polymer silver-nickel material layer 2 and a polymer carbon-based material layer 3. The polymer engineering plastic layer 1 is wrapped outside the polymer silver-nickel material layer 2, and the polymer silver-nickel material layer 2 is wrapped outside the polymer carbon-based material layer 3. The polymer silver-nickel material layer 2 is provided with a plurality of conductive contacts 100 at one end close to the commutator 5.

[0030] Further, the vertical cross-section of the polymer carbon-based material layer 3 is in a "return" shape structure or a "Z" shape structure.

[0031] Embodiment 2

[0032] Refer to Figure 3-4 , the difference between this Embodiment 2 and the above Embodiment 1 is that: the conductive layer 10 includes a polymer silver-nickel material layer 2 and a polymer carbon-based material layer 3. The polymer engineering plastic layer 1 is wrapped outside the polymer carbon-based material layer 3, and the polymer carbon-based material layer 3 is wrapped outside the polymer silver-nickel material layer 2. The polymer carbon-based material layer 3 is provided with a plurality of conductive contacts 100 at one end close to the commutator 5.

[0033] Further, the vertical cross-section of the polymer silver-nickel material layer 2 is in a "return" shape structure or a "Z" shape structure.

[0034] In the above Embodiment 1 and Embodiment 2, the design features of the conductive contacts 100 enable the carbon brush to always maintain good contact with the commutator 5, ensure the electrical conductivity, and are also beneficial to reducing the contact area between the carbon brush and the commutator 5.

[0035] In other embodiments, the vertical cross-section of the polymer engineering plastic layer 1 and the conductive layer 10 may also be in other forms, which will not be described in detail in this application.

[0036] In this invention, the material characteristics of the polymer engineering plastic layer 1 enable the brush to have wear resistance and self-lubrication, as well as excellent temperature adaptability and stability, making it less prone to breakage and decomposition. In addition, it also has certain electrical conductivity. The polymer engineering plastic layer 1 provides excellent protection for the polymer silver-nickel material layer 2 and the polymer carbon-based material layer 3.

[0037] Due to the material characteristics of the polymer silver-nickel material layer 2, the brush can have a resistance at the milliohm level, thus having high conductivity, as well as certain wear resistance and elasticity, and also has a wide operating temperature range.

[0038] Due to the material characteristics of the polymer carbon-based material layer 3, the brush can have a resistance at the milliohm level, thus having high conductivity, and also has certain wear resistance and self-lubricating properties, as well as a wide operating temperature range.

[0039] The polymer silver-nickel material layer 2 also serves as a unique elastomer to ensure that the polymer carbon-based material layer 3 maintains a perfect fit with the commutator under different operating conditions, making the conductivity more stable.

[0040] Refer to the instruction manual appendix Figure 1-5 It can be seen that the present invention adopts a "sandwich" composite structure, which makes the brush quieter during contact with the commutator 5, thus achieving a silent effect and a longer service life; the specific reason is:

[0041] 1. The present invention uses a high-wear-resistant protective layer of polymer engineering plastic 1, which can reduce the wear of the brush and increase the service life of the brush.

[0042] 2. The polymer silver-nickel material layer 2 and the polymer carbon-based material layer 3 in this utility model have high conductivity. Therefore, while ensuring high conductivity, the contact area between the polymer silver-nickel material layer 2, the polymer carbon-based material layer 3 and the commutator 5 can be reduced, which can reduce the overall volume of the brush.

[0043] 3. Compared with traditional brushes, the friction between the brush and the commutator 5 in this invention is less than that between the traditional brush and the commutator. This is because, according to the formula for calculating sliding friction, F = μ * N, where "μ" is the coefficient of kinetic friction, also known as the sliding friction coefficient, which is only related to the material and the roughness of the contact surface; and "N" is the normal force. Due to the material characteristics of the aforementioned polymer engineering plastic layer 1, polymer silver-nickel material layer 2, and polymer carbon-based material layer 3, the friction coefficient of the brush in this application is low. Therefore, the friction force can be reduced, ensuring the conductivity of the brush and the commutator 5 while reducing the sliding contact area, making the operation smoother. This reduces noise and brush wear, and improves the service life of the brush.

[0044] See also Figure 5 As shown, it should be noted that a spring is actually designed on the back side of the brush to provide pressure to the brush so that it can maintain effective contact with the commutator 5.

Claims

1. A composite carbon brush for a brushed electric motor comprising a housing, a wire (4), characterized in that, The housing encloses a conductive layer (10); The housing is a polymer engineering plastic layer (1), which encloses a conductive layer (10) inside, and the conductive layer (10) is connected to a wire (4); Both the polymer engineering plastic layer (1) and the conductive layer (10) are provided with vertical sections at one end close to the commutator (5), and there are multiple conductive contacts (100) at one end of the conductive layer (10) close to the commutator (5); The inner side of the polymer carbon-based material layer (3) encloses a polymer silver-nickel material layer (2), and the outer side of the polymer carbon-based material layer (3) encloses a polymer engineering plastic layer (1). Vertical sections are provided at one end where the polymer engineering plastic layer (1), the polymer silver-nickel material layer (2), and the polymer carbon-based material layer (3) contact the commutator; 2. A composite brush for a brushed electric motor according to claim 1, wherein The conductive layer (10) includes a polymer silver-nickel material layer (2) and a polymer carbon-based material layer (3). The polymer engineering plastic layer (1) encloses the outside of the polymer silver-nickel material layer (2), and the polymer silver-nickel material layer (2) encloses the outside of the polymer carbon-based material layer (3). There are multiple conductive contacts (100) at one end of the polymer silver-nickel material layer (2) close to the commutator (5); 3. A composite brush for a brushed electric motor according to claim 2, wherein The vertical section of the polymer carbon-based material layer (3) is in a "return" shape structure or a "Z" shape structure; 4. The composite brush for a brushed electric motor according to claim 1, characterized by The conductive layer (10) includes a polymer silver-nickel material layer (2) and a polymer carbon-based material layer (3). The polymer engineering plastic layer (1) encloses the outside of the polymer carbon-based material layer (3), and the polymer carbon-based material layer (3) encloses the outside of the polymer silver-nickel material layer (2). There are multiple conductive contacts (100) at one end of the polymer carbon-based material layer (3) close to the commutator (5); 5. The composite carbon brush for a brushed motor according to claim 4, characterized in that, The vertical section of the polymer silver-nickel material layer (2) is in a "return" shape structure or a "Z" shape structure;

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