Conductive carbon brush assembly and motor

Abstract

The conductive carbon brush assembly comprises a conductive cover, an elastic piece and a conductor, the conductive cover is connected with a motor shell, the conductive cover is suitable for grounding connection, the conductor is movably arranged on the outer side of a motor shaft, and a movable gap is formed between the conductor and the conductive cover in the direction of moving away from the motor shaft. The electric conductor penetrates through the movable gap to be electrically connected with the conductive cover, the elastic piece is arranged between the electric conductor and the conductive cover, the elastic piece is suitable for enabling the electric conductor to be close to and make contact with the motor shaft and to be conducted, and the motor has the advantages of being stable in structure, good in conductive effect and not prone to abrasion.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a conductive carbon brush assembly and a motor. Background Art

[0002] As the core technology that distinguishes new energy vehicles from traditional fuel vehicles, the three-electric system, namely battery, motor and electronic control, is the core technology. The performance of the three-electric system can directly affect the final performance of the product and is also a key factor considered by users when consuming. Among them, the motor is the driving source, and its life and stability are directly related to the durability and safety of the vehicle.

[0003] However, the existing motors have the following defects: the new energy electric drive assembly is affected by the frequency conversion controller, and during the operation of the motor, an electric potential difference, namely the shaft voltage, will be generated at both ends of the motor shaft or locally on the motor shaft. When the shaft voltage accumulates to a level that can break through the motor bearing oil film, it will conduct and form a shaft current between the motor shaft and the motor bearing, causing electrical corrosion to the motor bearing, resulting in unstable operation of the motor bearing, and even causing the motor bearing temperature to rise and fail prematurely. Summary of the invention

[0004] One purpose of the present application is to provide a conductive carbon brush assembly and a motor with a stable structure, good conductive effect, and low wear.

[0005] In order to achieve the above purpose, the technical solution adopted in the present application is: a conductive carbon brush assembly, including a conductive cover, an elastic member and a conductor, the conductive cover is connected to the motor housing, the conductive cover is suitable for grounding connection, the conductor is movably arranged on the outside of the motor shaft, the conductor forms an active gap with the conductive cover in the direction of moving away from the motor shaft, the conductor is electrically connected to the conductive cover through the active gap, the elastic member is arranged between the conductor and the conductive cover, and the elastic member is suitable for making the conductor close to the motor shaft and conduct.

[0006] In some embodiments, a contact channel is provided on the conductive cover, the conductor and the elastic member are provided in the contact channel, and the conductor is suitable for moving along the contact channel and contacting the motor shaft.

[0007] In some embodiments, the conductive cover includes a conductive end cap, a conductive shaft and a conductive terminal, the conductive shaft is arranged to pass through the conductive end cap, the contact channel is opened along the axial direction of the conductive shaft, the conductor and the conductive terminal are respectively arranged at both ends of the conductive shaft, and the conductor is suitable for passing through the contact channel to be electrically connected to the conductive terminal.

[0008] In some embodiments, a first limiting groove and a second limiting groove are provided on the conductive shaft, the first limiting groove is located outside the conductive end cover, and at least a portion of the second limiting groove is located inside the conductive end cover, and a first limiting portion and a second limiting portion are provided on the conductive terminal, the first limiting portion is suitable for fitting and embedding into the first limiting groove, and the second limiting portion is suitable for embedding into the second limiting groove.

[0009] In some embodiments, anti-slip portions are provided on both sides of the first limiting portion, and the anti-slip portions are suitable for interference fit with the conductive shaft in the first limiting groove; a protrusion is provided on the second limiting portion, and the protrusion is suitable for interference fit with the conductive shaft and the conductive end cover in the second limiting groove; the number of the first limiting groove, the second limiting groove, the first limiting portion and the second limiting portion is equal and multiple, the first limiting groove and the second limiting groove are staggered along the circumference of the motor shaft, and the first limiting portion and the second limiting portion are staggered along the circumference of the conductive terminal.

[0010] In some embodiments, the conductive cover and the conductor are flexibly and / or elastically connected.

[0011] In some embodiments, the electrical conductor and the motor shaft are in point contact, line contact, or surface contact.

[0012] In some embodiments, the contact end between the conductor and the motor shaft is a planar structure or an arc-shaped protruding structure.

[0013] In some embodiments, the electrical conductor is configured to be one or more of an axial arrangement along the motor shaft, a radial arrangement along the motor shaft, an arrangement surrounding the motor shaft, or an arrangement covering the motor shaft.

[0014] A motor comprises any one of the above conductive carbon brush assemblies.

[0015] Compared with the prior art, the beneficial effects of this application are:

[0016] 1. The conductive carbon brush assembly of the present application can stably contact the motor shaft, thereby conducting grounding for the shaft current generated when the motor is running, reducing the probability of electrical corrosion of the motor bearing under the influence of the shaft current, and increasing the operating life and stability of the motor. The conductive carbon brush assembly has a high degree of freedom in installation and can adapt to various motor structures. The elastic activity setting of the conductor can effectively reduce the load generated by the contact with the motor shaft during the operation of the motor shaft, thereby ensuring the normal operation of the motor. In addition, the elastic activity setting of the conductor can reduce the probability of conductive instability due to contact and wear between the conductor and the motor shaft.

[0017] 2. The motor of the present application can lead the current at the motor bearing to the ground when the motor is running through the conductive carbon brush assembly, thereby obtaining a longer operating life and operating stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure according to a preferred embodiment of the present application.

[0019] Figure 2 It is a schematic diagram of an explosion structure according to a preferred embodiment of the present application.

[0020] Figure 3 It is a schematic diagram of a structure that cooperates with a motor shaft according to a preferred embodiment of the present application.

[0021] Figure 4 It is a schematic diagram of a structure that cooperates with a motor shaft according to another preferred embodiment of the present application.

[0022] Figure 5 It is a schematic diagram of the cooperation between the conductive terminal and the conductive shaft according to a preferred embodiment of the present application.

[0023] Figure 6 It is a schematic diagram of the cooperation among the conductive terminal, the conductive shaft and the conductive end cap according to a preferred embodiment of the present application.

[0024] Figure 7 It is a schematic diagram of the overall structure of a motor according to a preferred embodiment of the present application.

[0025] In the figure: 1. conductive cover; 11. conductive end cover; 111. end cover shell; 112. end cover ring; 12. conductive shaft; 121. contact channel; 122. first limiting groove; 123. second limiting groove; 124. fixing rib; 13. conductive terminal; 131. first limiting part; 1311. anti-slip part; 132. second limiting part; 1321. protrusion; 14. grounding terminal; 2. elastic member; 3. conductor; 4. motor housing; 5. motor shaft; 6. movable gap. DETAILED DESCRIPTION

[0026] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0027] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present application.

[0028] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0029] The terms "including" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0030] The present application is further described below with reference to the accompanying drawings:

[0031] like Figures 1 to 7 As shown, the present application provides a conductive carbon brush assembly, including a conductive cover 1, an elastic member 2 and a conductor 3, the conductive cover 1 is connected to the motor housing 4, the conductive cover 1 is suitable for grounding connection, the conductor 3 is movably arranged on the outside of the motor shaft 5, the conductor 3 forms an active gap 6 with the conductive cover 1 in the direction of moving away from the motor shaft 5, the conductor 3 is electrically connected to the conductive cover 1 through the active gap 6, the elastic member 2 is arranged between the conductor 3 and the conductive cover 1, and the elastic member 2 is suitable for making the conductor 3 close to the motor shaft 5 and conduct.

[0032] The conductor 3 can conduct the current at the motor shaft 5 to the conductive cover 1, and then the current can be conducted by grounding the conductive cover 1, thereby reducing the damage of the current to the motor shaft 5. The conductor 3 and the conductive cover 1 are split designs. The conductive cover 1 can be fixed on the motor housing 4, and the conductor 3 can maintain contact and conduction with the motor shaft 5 with the help of the elastic member 2. The structural design and layout are more flexible and the installation adaptability is stronger.

[0033] Specifically, grounding terminals 14 may be provided around the conductive cover 1 , and the current may be led out by connecting the grounding terminals 14 externally.

[0034] In some embodiments, the electrical connection between the conductive cover 1 and the conductive body 3 may be achieved by a flexible connection and / or an elastic connection.

[0035] In some embodiments, the electrical connection between the conductive cover 1 and the conductor 3 can be achieved by providing an elastic wire. Usually, the wire itself has properties that, in addition to conductivity, also have a certain degree of flexibility. Therefore, the wire can compensate for the change in the distance between the conductive cover 1 and the conductor 3 to a situation less than the length of the wire through flexible deformation. In addition, the wire can compensate for the change in the distance between the conductive cover 1 and the conductor 3 to a situation greater than the length of the wire through elastic telescopic deformation.

[0036] In some embodiments, the electrical connection between the conductive cover 1 and the conductor 3 can be achieved by setting a wire whose length exceeds the longest distance between the conductive cover 1 and the conductor 3. Usually, the wire itself has properties, in addition to conductivity, and usually has a certain flexibility, and can adapt to the change of the distance between the conductive cover 1 and the conductor 3 through flexible deformation.

[0037] like Figures 1 to 2 In the illustrated embodiment, a contact channel 121 is provided on the conductive cover 1, and the conductor 3 and the elastic member 2 are provided in the contact channel 121. The conductor 3 is suitable for moving along the contact channel 121 and contacting the motor shaft 5. The contact channel 121 can guide the movement of the conductor 3 so that the conductor 3 can approach or move away from the motor shaft 5 in a fixed direction to avoid accidental movement of the conductor 3. Similarly, the conductor 3 can also limit the elastic member 2 from detaching from the conductive cover 1 in the contact channel 121.

[0038] In some embodiments, the elastic member 2 is axially arranged along the contact channel 121 , and the elastic deformation direction of the elastic member 2 is the same as the moving direction of the conductor 3 , thereby fully utilizing the elastic force of the elastic member 2 so that the conductor 3 can stably rest against the motor shaft 5 .

[0039] like Figure 3 In the illustrated embodiment, the elastic member 2 is preferably a spring, and the width of the elastic member 2 is not greater than the diameter of the contact channel 121 .

[0040] like Figure 3 As shown, it can be understood that the space between the conductor 3 in the contact channel 121 and the conductive terminal 13 is the active gap 6 .

[0041] In some embodiments, the conductor 3 and the motor shaft 5 are in point contact, which has the smallest contact area and can reduce wear between the conductor 3 and the motor shaft 5 .

[0042] like Figure 4In the illustrated embodiment, the contact end between the conductor 3 and the motor shaft 5 is an arc-shaped protruding structure, which is specifically shown as a hemispherical structure in the figure. Point-to-surface contact cooperation is achieved between the conductor 3 and the motor shaft 5, which can obtain a smaller contact surface between the conductor 3 and the motor shaft 5, reduce the contact area, and thus reduce contact wear.

[0043] In some embodiments, the conductor 3 and the motor shaft 5 can be in line contact or surface contact. Compared with point contact, this contact form has a larger contact area, which can achieve higher contact stability between the conductor 3 and the motor shaft 5 and reduce the probability of separation between the conductor 3 and the motor shaft 5.

[0044] like Figure 3 In the illustrated embodiment, the contact end between the conductor 3 and the motor shaft 5 is a planar structure, which is specifically shown as a rectangular structure in the figure. Surface-to-surface contact is achieved between the conductor 3 and the motor shaft 5, which can not only ensure the contact stability between the conductor 3 and the motor shaft 5, but also avoid wear caused by relative movement between the conductor 3 and the conductive shaft 12.

[0045] It can be understood that in addition to the hemispherical structure and rectangular structure listed above, the contact forms of conventional structures between the conductor 3 and the motor shaft 5 can achieve similar effects. Due to the presence of the elastic member 2, the conductor 3 can reduce the wear between the conductor 3 and the motor shaft 5 by overcoming the passive movement of the elastic force of the elastic member 2. Therefore, a variety of structural shapes can be achieved, and they are all within the protection scope of this application.

[0046] In some embodiments, the conductor 3 is configured to be arranged axially along the motor shaft 5, radially along the motor shaft 5, around the motor shaft 5, or covering the motor shaft 5, or one or more of the above. The arrangement form is relatively flexible and free, and can be selected according to the structural design of the motor, avoiding the original structure of the motor and reducing interference between structures.

[0047] like Figures 3 to 4 In the illustrated embodiment, the conductor 3 is configured to be arranged axially along the motor shaft 5. This arrangement can minimize the relative movement between the conductor 3 and the motor shaft 5, thereby effectively reducing the wear between the two and increasing the service life of the conductor 3.

[0048] like Figures 1 to 2In the illustrated embodiment, the conductive cover 1 includes a conductive end cover 11, a conductive shaft 12 and a conductive terminal 13. The conductive shaft 12 is arranged to pass through the conductive end cover 11. The contact channel 121 is opened along the axial direction of the conductive shaft 12. The conductor 3 and the conductive terminal 13 are respectively arranged at both ends of the conductive shaft 12. The conductor 3 is suitable for passing through the contact channel 121 to be electrically connected to the conductive terminal 13. The conductive terminal 13 is electrically connected to the conductive end cover 11 and the conductor 3. The conductive terminal 13 can conduct current to the conductive end cover 11 through contact cooperation, thereby facilitating the subsequent current lead-out.

[0049] like Figure 5 In the illustrated embodiment, a first limiting groove 122 and a second limiting groove 123 are provided on the conductive shaft 12. When the conductive shaft 12 is installed on the conductive end cover 11, the first limiting groove 122 is located outside the conductive end cover 11, and at least a portion of the second limiting groove 123 is located inside the conductive end cover 11. A first limiting portion 131 and a second limiting portion 132 are provided on the conductive terminal 13. The first limiting portion 131 is suitable for fitting into the first limiting groove 122, and the second limiting portion 132 is suitable for fitting into the second limiting groove 123. The fixing of the conductive terminal 13 and the conductive shaft 12 is achieved by utilizing the fitting of the first limiting portion 131 and the first limiting groove 122 as well as the fitting of the second limiting portion 132 and the second limiting groove 123.

[0050] The second limiting portion 132 can extend between the conductive shaft 12 and the conductive end cover 11 in the second limiting groove 123, and contact the conductive shaft 12 and the conductive end cover 11 at the same time. By utilizing the second limiting portion 132, the current obtained from the conductor 3 can be transmitted to the conductive end cover 11, thereby fully utilizing the fixed structure of the conductive terminal 13, reducing additional connection structures, and reducing space occupancy.

[0051] like Figure 5 In the illustrated embodiment, anti-slip portions 1311 are provided on both sides of the first limiting portion 131. The anti-slip portions 1311 are suitable for interference fit with the conductive shaft 12 in the first limiting groove 122, and can play a limiting role, effectively preventing the conductive terminal 13 and the conductive shaft 12 from moving or even separating.

[0052] like Figure 5 In the illustrated embodiment, the anti-detachment portion 1311 is an inclined tooth-like structure, the inclination direction of the tooth-like structure is toward the direction in which the conductive terminal 13 detaches from the conductive shaft 12 , and the first limiting portion 131 is restricted from moving in the first limiting groove 122 by means of an inverted hook.

[0053] like Figure 5In the illustrated embodiment, a protrusion 1321 is provided on the second limiting portion 132, and the protrusion 1321 is suitable for interference fit with the conductive shaft 12 and the conductive end cover 11 in the second limiting groove 123. The structural form of the protrusion 1321 can both achieve stable contact and limit the movement of the second limiting portion 132 in the second limiting groove 123.

[0054] like Figure 5 In the illustrated embodiment, the number of the first limiting groove 122, the second limiting groove 123, the first limiting portion 131 and the second limiting portion 132 are equal and multiple, the first limiting groove 122 and the second limiting groove 123 are staggered along the circumference of the motor shaft 5, and the first limiting portion 131 and the second limiting portion 132 are staggered along the circumference of the conductive terminal 13, which can make the force more uniform, reduce the probability of the conductive terminal 13 detaching from the motor shaft 5, and reduce the probability of the conductive terminal 13 being deformed.

[0055] like Figure 5 In the illustrated embodiment, the conductive shaft 12 is provided with a plurality of fixing ribs 124 along the circumferential direction. The fixing ribs 124 can fill the gap between the conductive shaft 12 and the conductive end cover 11, thereby helping the conductive shaft 12 to be stably connected to the conductive end cover 11 and reducing the movable shaking therebetween.

[0056] In some embodiments, the fixing ribs 124 are arranged axially along the conductive shaft 12 , and can guide the conductive shaft 12 to be embedded in the conductive end cap 11 .

[0057] In some embodiments, the conductive end cover 11 can be a split design, which can be divided into an end cover shell 111 and an end cover ring 112. The end cover ring 112 can be wrapped around the outside of the motor shaft 5, and the end cover shell 111 can fix the end cover ring 112 to the motor housing 4. A grounding terminal 14 can be set on the end cover ring 112 to extract the current at the conductive terminal 13 through an external connection. This design can effectively utilize the space and structure at the end cover to realize the extraction of current at the motor shaft 5 by structurally improving the original end cover position at the motor shaft 5.

[0058] like Figure 7 In the illustrated embodiment, the present application also provides a motor comprising a conductive carbon brush assembly according to any of the above embodiments.

[0059] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A conductive carbon brush assembly, characterized in that: It includes a conductive cover, an elastic member and a conductor, wherein the conductive cover is connected to a motor housing, the conductive cover is suitable for grounding connection, the conductor is movably arranged on the outside of the motor shaft, the conductor forms a movable gap with the conductive cover in a direction moving away from the motor shaft, the conductor is electrically connected to the conductive cover through the movable gap, the elastic member is arranged between the conductor and the conductive cover, and the elastic member is suitable for making the conductor close to the motor shaft and conduct.

2. A conductive carbon brush assembly according to claim 1, characterized in that: The conductive cover is provided with a contact channel, the conductor and the elastic member are arranged in the contact channel, and the conductor is suitable for moving along the contact channel and contacting the motor shaft.

3. A conductive carbon brush assembly as claimed in claim 2, characterized in that: The conductive cover comprises a conductive end cap, a conductive shaft and a conductive terminal. The conductive shaft passes through the conductive end cap, the contact channel is opened along the axial direction of the conductive shaft, the conductor and the conductive terminal are respectively arranged at both ends of the conductive shaft, and the conductor is suitable for passing through the contact channel to be electrically connected with the conductive terminal.

4. A conductive carbon brush assembly as claimed in claim 3, characterized in that: The conductive shaft is provided with a first limiting groove and a second limiting groove, wherein the first limiting groove is located outside the conductive end cover, and at least a portion of the second limiting groove is located inside the conductive end cover. The conductive terminal is provided with a first limiting portion and a second limiting portion, wherein the first limiting portion is adapted to be fitted and embedded in the first limiting groove, and the second limiting portion is adapted to be embedded in the second limiting groove.

5. A conductive carbon brush assembly as claimed in claim 4, characterized in that: Anti-slip portions are arranged on both sides of the first limiting portion, and the anti-slip portions are suitable for interference fit with the conductive shaft in the first limiting groove; a protrusion is arranged on the second limiting portion, and the protrusion is suitable for interference fit with the conductive shaft and the conductive end cover in the second limiting groove; the number of the first limiting groove, the second limiting groove, the first limiting portion and the second limiting portion is equal and multiple, the first limiting groove and the second limiting groove are staggered along the circumference of the motor shaft, and the first limiting portion and the second limiting portion are staggered along the circumference of the conductive terminal.

6. A conductive carbon brush assembly according to claim 1, characterized in that: The conductive cover and the conductor are flexibly and / or elastically connected.

7. A conductive carbon brush assembly according to claim 1, characterized in that: The conductor and the motor shaft are in point contact, line contact or surface contact.

8. A conductive carbon brush assembly according to claim 7, characterized in that: The contact end between the conductor and the motor shaft is a planar structure or an arc-shaped convex structure.

9. A conductive carbon brush assembly as claimed in claim 1, characterized in that: The electrical conductor is configured to be one or more of an axial arrangement along the motor shaft, a radial arrangement along the motor shaft, an arrangement surrounding the motor shaft, or an arrangement covering the motor shaft.

10. A motor, characterized in that: The present invention comprises a conductive carbon brush assembly as claimed in any one of claims 1 to 9.

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