Conductive brush, conductive ring and motor

Abstract

According to the conductive brush, the conductive ring and the motor, the cross section of an accommodating cavity of a fixing piece for fixing a conductive fiber bundle is set to be polygonal or similar to polygonal, and the side part of the accommodating cavity formed by sequential connection is in interference fit with the conductive fiber bundle; the interference magnitude of interference fit between the conductive fiber bundle and the fixing piece enables the axial pulling-out resistance of the conductive fiber bundle to be at least 100 N, and / or the ratio of the maximum value to the minimum value in the distance between the center of the conductive fiber bundle and the midpoint of each side of the polygon or the polygon-like polygon is any value between 1 and 2. According to the utility model, the performance of the conductive fibers for resisting axial pull-off in the use process of the conductive brush is improved, the motor shaft damage caused by the falling-off of the conductive fibers is avoided, and the service life of the motor shaft is prolonged.

Description

Technical Field

[0001] The utility model relates to a conductive brush, a slip ring and a motor, belonging to the technical field of slip ring structure design. Background Art

[0002] When the motor of a new energy vehicle is frequency-converted, the voltage on the shaft will increase, and the shaft voltage is released through the current passing through the bearing. During the release of the current, the bearing race and the surface of the ball are electro-corroded, and this corrosion process is slow. During this process, the driver will feel that the power of the new energy vehicle is getting smaller and smaller. By the time the vehicle breaks down, the bearing of the vehicle motor has been damaged, manifested as blackened grease, and there are melting pits on the surface of the bearing race and the ball. The particles in the melting pit layer are sealed in the bearing by the sealed bearing. These reasons ultimately accelerate the shortening of the bearing life.

[0003] Therefore, in order to prevent the occurrence of the above-mentioned electro-corrosion phenomenon, a slip ring needs to be installed on the motor bearing. Most slip rings are composed of a ring-shaped fixing point and a conductive brush installed on the ring-shaped fixing member. Please refer to Figure 1 , the conductive brush includes a conductive fiber bundle 1 and a fixing cylinder 2 for fixing the conductive fiber bundle. The existing fixing cylinder is usually of a quasi-circular or approximately rectangular flat structure. The fixing effect of the two-shaped fixing members on the conductive fiber bundle is limited. After long-term use, especially in the long-term use scenario under harsh working conditions (working conditions with large rotational speed or large rotational speed changes), some of the conductive fibers in the conductive fiber bundle will still come out of the fixing cylinder, thus causing damage to the motor. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a conductive brush, a slip ring and a motor, which improve the fixing effect on the conductive fiber bundle and prevent the conductive fibers from falling off during use.

[0005] To achieve the above purpose, the utility model provides the following technical solution: a conductive brush, the conductive brush includes a conductive fiber bundle and a fixing member for fixing the conductive fiber bundle. The fixing member includes side parts connected in sequence to form a receiving cavity. The cross-section of the receiving cavity is a polygon or a quasi-polygon. The fixing fiber bundle is arranged in the receiving cavity and at least one end extends out of the receiving cavity. The conductive fiber bundle is in interference fit with the fixing member; and

[0006] the interference amount of the interference fit between the conductive fiber bundle and the fixing member enables the axial pull-off resistance of the conductive fiber bundle to be at least 100 N, and / or

[0007] the ratio of the maximum value to the minimum value of the distances from the center of the conductive fiber bundle to the midpoints of the sides of the polygon or quasi-polygon is any value between 1 and 2.

[0008] Further, an inner fillet is formed between the inner surfaces of two adjacent side portions, and an outer fillet is formed between the outer surfaces of two adjacent side portions, and the radius of at least one of the inner fillets is not less than the radius of the corresponding outer fillet.

[0009] Further, the inner wall surface of the fixing member is a combined surface composed of a plane and a curved surface.

[0010] Further, at least a part of the side portion is configured as a deformation portion that deforms inward under an external force after the fixing member is installed with the conductive fiber.

[0011] Further, in the axial direction of the fixing member, the cross-section of at least a part of the accommodating cavity is a polygon or a quasi-polygon.

[0012] Further, all side portions of the fixing member are deformation portions, and the fixing member is configured such that the cross-section of the accommodating cavity is converted from a circle to a quasi-regular polygon or a regular polygon under an external force.

[0013] Further, the cross-section of the fixing member is a quasi-regular hexagon or a regular hexagon.

[0014] Further, the fixing member is of an integral structure or a covered structure.

[0015] The present utility model also provides a conductive ring, which includes a fixing ring and the above-mentioned conductive brush installed in the conductive ring.

[0016] The present utility model also provides a motor, which includes the above-mentioned conductive ring installed on the output shaft of the motor.

[0017] The beneficial effects of the present utility model are as follows: In this application, the cross-section of the accommodating cavity of the fixing member for fixing the conductive fiber bundle is set as a polygon or a quasi-polygon, and the side portions that are sequentially connected to form the accommodating cavity are in interference fit with the conductive fiber bundle, so that the interference amount of the interference fit between adjacent conductive fibers and between the conductive fibers and the fixing member makes the axial pull-off resistance of the conductive fiber bundle at least 100 N, thereby improving the performance of the conductive fiber in resisting axial pull-off during the use of the conductive brush, ensuring that the conductive fiber does not fall off before wear and replacement, avoiding damage to the motor shaft caused by the falling off of the conductive fiber, and improving the service life of the motor shaft.

[0018] Further, when the conductive fiber bundle is loaded in the fixing member, the ratio of the maximum value to the minimum value of the distance from the center of the conductive fiber bundle to the center of each side is any value between 1 and 2, so that the force on the conductive fiber bundle in the fixing member is relatively balanced, and the problems of damaging the conductive fiber or too low axial pull-off resistance of some conductive fibers are solved.

[0019] The present application also provides a slip ring which fixes the above-mentioned conducting brush through a fixing ring so as to be easily mounted on the output shaft of a motor, thereby reducing the phenomenon of electrical corrosion of the motor bearing and increasing the service life of the motor.

[0020] The present application also provides a motor, on which the above-mentioned slip ring is arranged on the output shaft, thereby protecting the motor bearing and prolonging the service life of the motor.

[0021] The above description is only an overview of the technical solution of the present utility model. In order to be able to understand the technical means of the present utility model more clearly and implement it according to the content of the description, the following takes the preferred embodiments of the present utility model and describes them in detail with reference to the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the conducting brush in the prior art.

[0023] Figure 2 It is a schematic structural diagram of a quasi-regular hexagon conducting brush shown in an embodiment of the present application.

[0024] Figure 3 It is a schematic structural diagram of a quasi-regular quadrilateral conducting brush shown in an embodiment of the present application.

[0025] Figure 4 It is a schematic structural diagram of a star-shaped conducting brush shown in an embodiment of the present application.

[0026] Figure 5 It is a schematic structural diagram of the slip ring shown in an embodiment of the present application.

[0027] Figure 6 It is a schematic structural diagram of the slip ring shown in another embodiment of the present application.

[0028] Figure 7 It is a schematic structural diagram of the slip ring shown in still another embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The following further describes in detail the specific embodiments of the present utility model in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present utility model but are not used to limit the scope of the present utility model.

[0030] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0031] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0032] Please refer to Figure 2 , a conductive brush shown in an embodiment of the present application. The conductive brush includes a conductive fiber bundle 3 and a fixing member 4 for fixing the conductive fiber bundle 3. The fixing member 4 includes a side portion 41 with a polygon or quasi-polygon cross-section that are sequentially connected to form a receiving cavity. The fixing fiber bundle is inserted into the receiving cavity and at least one end extends out of the receiving cavity. The conductive fiber bundle 3 is in interference fit with the receiving cavity. The interference amount of the interference fit between the conductive fiber bundle 3 and the fixing member 4 is such that the anti-axial pulling force of the conductive fiber bundle 3 is at least 100 N. It should be noted that the anti-axial pulling force is the reaction force of the axial pulling force, and the axial pulling force refers to the minimum pulling force applied axially to the conductive fiber bundle 3 when at least part of the conductive fiber bundle 3 is pulled out of the fixing member 4.

[0033] It should be noted that the above accommodation cavity can be formed into a special shape of a polygon or quasi-polygon by extrusion molding or any other existing processing method, such as a hot-melt processing method, a method of forming by designing a mold to wrap around the outside of the conductive fiber bundle 3, etc., which is not limited here. In one embodiment, in order to facilitate the insertion of the conductive fiber bundle 3 into the fixing member 4, before the conductive fiber bundle 3 passes through the accommodation cavity, a binding band is used to shrink a plurality of conductive fibers into a bundle, and after the bound conductive fiber bundle 3 is passed through the accommodation cavity, the binding band is released. The size and shape of the accommodation cavity of the fixing member 4 are set to be convenient for inserting the conductive fiber bundle 3 and capable of at least partially squeezing the conductive fiber bundle 3, so that the conductive fiber bundle 3 is not easily detached. Then, when processing by extrusion molding, after the conductive fiber bundle 3 is passed through the accommodation cavity of the fixing member 4, several squeezing forces in different directions pointing to the center are applied to the fixing member 4, so that the side portion 41 of the fixing member 4 before processing deforms inward, so that the cross-section of the accommodation cavity is a polygon or a quasi-polygon. Before squeezing the fixing member 4, the cross-section of the accommodation cavity can be in the shape of a circle, a square, an ellipse, etc. This processing method further limits the volume of the original accommodation cavity of the fixing member 4, that is, on the basis of the interference fit between the conductive fiber bundle 3 and the fixing member 4, the interference amount between the fixing member 4 and the conductive fiber bundle 3 is further increased, so as to improve the axial tensile detachment force of the conductive fiber, so that it can withstand an axial tensile detachment force of at least 100 N without falling off.

[0034] In this embodiment, the cross-section of the accommodation cavity of the fixing member 4 is a polygon or a quasi-polygon, and the accommodation cavity is in interference fit with the conductive fiber bundle 3. The interference fit amount can make the axial tensile detachment force between the fixing member 4 and the conductive fiber bundle 3 at least 100 N, so as to ensure that the conductive fiber bundle 3 is still not easily detached from the fixing member 4 after long-term use, meeting the durability use requirements under complex working conditions.

[0035] In another embodiment, the side portion 41 of the fixing member 4 can also be deformed inward to form an accommodation cavity with a cross-section of a polygon or a quasi-polygon. The conductive fiber bundle 3 is in interference fit with the accommodation cavity, and the ratio A of the maximum value to the minimum value of the distance from the center of the conductive fiber bundle 3 to the midpoints of the sides of the polygon or quasi-polygon is any value between 1 and 2, such as the ratio is 1, 1.2, 1.5 or 2, and the ratio can also be any other value between 1 and 2.

[0036] In this embodiment, by limiting the ratio of the maximum value to the minimum value of the distance from the center of the conductive fiber bundle 3 to the midpoints of the sides of the polygon or quasi-polygon to be between 1 and 2, it is possible to ensure that the cross-sectional shape of the accommodating cavity of the fixing member has better uniformity, thereby generating a more balanced squeezing force on the conductive fiber bundle 3, so that the difference in the squeezing forces between the conductive fibers in each part is within a certain range, avoiding the situation where some conductive fibers are damaged due to excessive squeezing force, while some conductive fibers are prone to falling off due to too little squeezing force.

[0037] Example 1, please refer to Figure 2 , this embodiment provides a fixing member 4 whose cross-section perpendicular to the axial direction of the accommodating cavity is a quasi-regular hexagon. Each side of the quasi-regular hexagon is composed of a straight side and a curved side connected in sequence. Therefore, the maximum value of the distance from the center of the conductive fiber bundle 3 to each side of the quasi-regular hexagon is the distance from the center of the conductive fiber bundle 3 to the midpoint of the curved side, which is approximately equal to the radius of the circumscribed circle of the quasi-regular hexagon. The minimum value of the distance from the center of the conductive fiber bundle 3 to each side of the quasi-regular hexagon is the distance from the center of the conductive fiber bundle 3 to the midpoint of the straight side. The ratio A of the two is approximately equal to 1.06. This fixing member 4 retains the concentrated bundling effect of the approximate cylinder on the conductive fiber bundle 3, ensuring that the conductive fiber bundle 3 is relatively concentrated, so as to ensure that the squeezing forces received by each conductive fiber are similar, and further ensuring the fixing effect of the fixing member 4 on the conductive fiber bundle 3.

[0038] Example 2, please refer to Figure 3 , the cross-section of the accommodating cavity perpendicular to the axial direction is a quasi-regular quadrilateral. Each side of the quasi-regular hexagon is composed of a straight side and a curved side connected in sequence. Obviously, the maximum value of the distance from the center of the conductive fiber bundle 3 to each side of the quasi-regular quadrilateral is the distance from the center of the conductive fiber bundle 3 to the midpoint of the curved side of the quasi-regular quadrilateral, and the minimum value is the distance from the center of the conductive fiber bundle 3 to the midpoint of the straight side of the quasi-regular quadrilateral. The ratio A of the two is approximately equal to 1.2. The conductive fiber bundle 4 in this embodiment can still ensure the fixing effect of the fixing member 4 on the conductive fiber bundle 3, and the processing method is simpler.

[0039] Example 3, please refer to Figure 4, the cross-section of the accommodation cavity in the vertical axial direction is star-shaped, specifically a hexagonal star shape, which includes protruding convex angles and recessed concave angles. Obviously, the maximum value among the distances from the center of the conductive fiber bundle 3 to the midpoints of the sides of the hexagonal star shape is the distance from the center of the conductive fiber bundle 3 to the midpoint of the curved edge of the convex angle end, and the maximum value is the distance from the center of the conductive fiber bundle 3 to the midpoint of the curved edge of the concave angle end. In this embodiment, the ratio A of the two is approximately equal to 1.27, that is, the difference in the distances from the conductive fibers near the convex angle and the conductive fibers near the concave angle to the center of the conductive fiber bundle 3 is not large. Therefore, although there are differences in the extrusion forces received by the conductive fibers at various positions within the fixing member 4, the differences are not large, and it can still improve the fixing effect of the fixing member 4 on the conductive fiber bundle 3, avoiding the easy detachment of the conductive fibers due to excessive force differences.

[0040] Example 4, the difference from Example 3 is only that: the ratio A of the maximum value to the minimum value of the distances from the center of the conductive fiber bundle 3 to the midpoints of the sides of the polygon or polygon-like shape is 1.5. Then, the difference in the distances from the conductive fibers near the convex angle and the conductive fibers near the concave angle to the center of the conductive fiber bundle 3 is greater. Obviously, the larger the ratio A, the farther the conductive fibers at the edge are from the center of the conductive fiber bundle 3, and correspondingly, the greater the difference in the extrusion forces received by the conductive fibers at the edge, and the easier the outermost conductive fibers are to fall off.

[0041] Comparative Example 1, the difference from Example 3 is only that: the ratio of the maximum value to the minimum value of the distances from the center of the conductive fiber bundle 3 to the midpoints of the sides of the polygon or polygon-like shape is 2.5, that is, the distance from the center of the conductive fiber bundle 3 to the midpoint of the curved edge of the convex angle is 2.5 times the distance from the center of the conductive fiber bundle 3 to the midpoint of the curved edge of the concave angle. For the same conductive fiber bundle 3 tested under the same working conditions, it was found that the time when the conductive fiber bundle 3 in Comparative Example 1 became disengaged was much earlier than that in Example 3. This is because before the conductive fiber bundle 3 is inserted into the fixing member 4 in Comparative Example 1, the shape of the conductive fiber bundle 3 cannot be adapted to the shape of the accommodation cavity of the fixing member 4. When the restraint band is loosened, the conductive fibers near the center are squeezed against each other, ensuring sufficient axial pull-off resistance. However, the conductive fibers at the edge are scattered due to the need to fill the corners of the accommodation cavity, resulting in limited extrusion force between them and the interference amount with the inner wall of the accommodation cavity, resulting in a small axial pull-off resistance, and the conductive fibers at the edge are more likely to fall off during the use of the conductive brush.

[0042] Of course, for the fixing member 4 with a structure similar to a regular hexagon or a regular quadrilateral, when the ratio A is too large, the aspect ratio of the conductive fiber bundle 3 will still be too large, and the conductive fiber bundle 3 will be distributed relatively scattered. As a result, the conductive fibers at the edge and those near the center will be unevenly stressed, and the conductive fiber bundle at the farthest end is likely to fall off during use. In the prior art, usually a force application groove is provided to increase the interference fit between the conductive fiber bundle 3 and the fixing member 4 through the force application groove. However, due to the large ratio A, the conductive fibers are scattered, resulting in the part near the force application groove being easily damaged due to the deformation of the force application groove, and the interference fit between the conductive fibers at the edge and the fixing member 4 cannot be increased too much. Therefore, the conductive fibers at the edge are still likely to fall off.

[0043] Preferably, after the conductive fiber bundle 3 is inserted into the accommodation cavity of the fixing member 4, several squeezing forces in different directions are applied in the circumferential direction on the fixing member 4, so that the side part 41 of the fixing member 4 deforms inward to form an accommodation cavity with a cross-section in a polygon or a shape similar to a polygon, so as to meet the requirement that the conductive fiber can withstand at least 100N of tensile force without falling off, and at the same time, the ratio of the maximum value to the minimum value of the distance from the center of the polygon or the shape similar to a polygon to the center of each side is any value between 1 and 2, thereby improving the anti-axial pull-off force of the wire fiber and also avoiding damage to the conductive fiber.

[0044] In an embodiment, an inner fillet 43 is formed between the inner surfaces of two adjacent side parts, and an outer fillet 42 is formed between the outer surfaces of two adjacent side parts, and the radius of at least one inner fillet 43 is not less than the radius of the corresponding outer fillet 42. With such a setting, when the space inside the fixing member 4 is restricted inward, the change can be more gentle, the surface of the inner wall of the fixing member 4 in contact with the conductive fiber bundle 3 is more uniform. At the same time, sharp edges in the accommodation cavity can be reduced during the extrusion deformation process, reducing the risk of damage to the conductive fiber bundle 3. Moreover, the radius of the outer fillet is small, that is, a relatively sharp fillet is formed outward, making the extrusion deformation process of the fixing member 4 easier to achieve. In addition, the inner fillet 43 is relatively sharp. After being loaded and clamped later, the anti-torsion effect is good, avoiding the rotation of the conductive brush. The inner included angle circle is not easy to squeeze and limit the fiber bundle, making the squeezing force received by the conductive fibers at each position relatively balanced, avoiding the need to use glue to fix the conductive fiber bundle 3, and solving the problem that the glue hardens into powder over time and affects the rotating shaft.

[0045] Of course, in other embodiments, the radius of the inner fillet 43 can also be smaller than the radius of the outer fillet 42. Please refer to Figure 3 The cross-section of the fixing member 4 is in a shape similar to a regular quadrilateral. By setting the outer fillet 42 to be larger, it is convenient to form an installation hole in the fixing ring that matches the shape of the fixing member 4, facilitating the installation and fixation of the conductive brush.

[0046] In one embodiment, at least a part of the side portion 41 is configured as a deformed portion that deforms inward under an external force after the conductive fiber is installed in the fixing member 4. It should be noted that the deformed portion refers to the side portion 41 formed by inward extrusion with an external force after the conductive fiber bundle 3 is threaded through the fixing member 4. That is, on the premise that a part of the outer wall of the fixing member 4 before processing and forming remains unchanged, an extrusion force is applied to another part of the outer wall of the fixing member 4 in the direction of the accommodation cavity, so that a part of the outer wall of the fixing member 4 deforms inward toward the inside of the accommodation cavity to form a deformed portion. Since the deformed portion is formed by inward extrusion with an external force, the accommodation cavity will be further restricted inward, and the inner abutting plane will abut the conductive fiber bundle 3 against the original inner wall of the fixing member 4, thereby increasing the clamping force of the fixing member 4 on the conductive fiber bundle 3 and further preventing the conductive fiber bundle 3 from falling off.

[0047] In other embodiments, to meet some special installation requirements, the quasi-polygon can also be a quasi-convex polygon or a quasi-concave polygon. For example, please refer to Figure 4 , the deformed portion is V-shaped, so that a groove 44 recessed inward is formed on the surface of the fixing member 4, the cross-section of the fixing member 4 is star-shaped, or the deformed portion is trapezoidal or other shapes, so that the cross-section of the fixing member 4 is a quasi-concave polygon, or a quasi-convex polygon is formed by applying extrusion forces of different magnitudes, etc. Its specific shape can be set according to needs and will not be specifically limited here.

[0048] The inner wall surface of the fixing member 4 is a combined surface composed of a plane and a curved surface. During the process in which a part of the side portion 41 of the fixing member 4 is configured as a deformed portion, the deformed portion is usually planar, so that the deformed portion is planar both inside and outside the fixing member 4, and adjacent two deformed portions both deform inward, so that a curved surface is formed by bending between the two deformed portions, avoiding the occurrence of sharp edges and causing the conductive fiber to be squeezed and damaged by the two deformed walls.

[0049] In the axial direction of the fixing member 4, the cross-section of at least a part of the accommodation cavity is a polygon or a quasi-polygon. In this embodiment, in the axial direction of the fixing member 4, the entire side portion 41 of the fixing member 4 is configured as a deformed portion, so that the cross-section of the accommodation cavity in the axial direction of the fixing member 4 is a polygon or a quasi-polygon. Such a setting can make the interference amount of the interference fit between the part of the conductive fiber bundle 3 in the fixing member 4 and the fixing member 4 reach the maximum value, so that the axial pull-off resistance of the conductive fiber can meet higher usage requirements.

[0050] In other embodiments, in the axial direction of the fixing member 4, a part of the side portion 41 is configured as a deformation portion, so as to increase the interference amount of a part of the conductive fiber bundle 3 in the accommodation cavity. Specifically, a part of the side portion 41 of the fixing member 4 away from the end where the conductive fiber contacts the motor is configured as a deformation portion, so as to ensure that the axial tensile detachment force of the conductive fiber meets the requirements while the end of the conductive fiber with a small interference amount is away from the output shaft of the motor. During use, the conductive fiber is not easily bent and broken, thus improving the service life. The specific set length of the deformation portion can be set according to the tensile strength and will not be specifically limited herein.

[0051] All side portions 41 of the fixing member 4 are deformation portions, and the fixing member 4 is configured such that the cross-section of the accommodation cavity is converted from a circle to a quasi-regular polygon or a regular polygon under an external force.

[0052] In this embodiment, the fixing member 4 is a cylindrical structure, and the side portion 41 of the fixing member 4 is a complete circular curved wall. After the conductive fiber bundle 3 is installed into the cylindrical structure, at least three planar abutting members are arranged at intervals in the circumferential direction of the cylindrical structure, so that the side portion 41 of the cylindrical structure deforms towards the accommodation cavity direction, thereby forming at least three deformation portions on the side portion 41 of the fixing member 4. The deformation portions are planar, and the deformation portions are connected by a curved wall, so that the cross-section of the cylindrical structure at the deformation portion is a quasi-polygonal ring structure, and the cross-section of the accommodation cavity inside it is a quasi-regular polygon. Of course, according to needs, the curved wall between the deformation portions can also be processed so that the cross-section of the accommodation cavity inside it is a regular polygon.

[0053] Since the cross-section of the accommodation space is a quasi-regular polygon formed by extrusion of a circle, the space of the accommodation cavity of the fixing member 4 through which the conductive fiber bundle 3 passes is further reduced, and the conductive fiber bundle 3 will be extruded towards the center during the deformation process, so that the interference amount of the interference fit between the conductive fibers and between the conductive fibers and the fixing member 4 is larger, thereby improving the axial tensile detachment force of the conductive fiber bundle 3. The specific shape and size of the cross-section of the accommodation cavity can be obtained by adjusting the number and angle of the planar abutting members, and can be specifically set according to the requirements of the axial tensile detachment force and / or the ratio of the maximum distance and the minimum distance from the center of the conductive fiber bundle 3 to each side, which will not be specifically limited herein.

[0054] Of course, in other embodiments, the fixing member 4 can also be a square cylindrical structure, an elliptical cylindrical structure or other cylindrical structures, and the fixing member 4 is extruded to form a structure with a cross-section of a quasi-regular polygon or a regular polygon by an extrusion deformation method, as long as the above effects can be satisfied, which will not be specifically limited herein.

[0055] In this embodiment, the cross-section of the fixing member 4 is a quasi-regular hexagon or a regular hexagon. Six mutated walls are formed at equal intervals in the circumferential direction of the fixing member 4 by external force extrusion. The widths of the six mutated walls and the included angles between adjacent two mutated walls are equal. Since the six mutated walls are formed by extrusion deformation, adjacent two mutated walls are connected by a curved surface wall, so that the cross-section of the fixing member 4 is a quasi-regular hexagon ring structure with rounded chamfers at the edges, and the cross-section of the accommodating cavity is a quasi-regular hexagon with rounded chamfers at the edges. The lengths of the sides and the interior angles of the regular hexagon ring structure are all equal. This uniformity makes the processing simpler and more efficient. Secondly, the structure is stable mechanically and can effectively withstand external pressure and tension. Of course, in other embodiments, the curved surface wall can also be processed as needed so that the cross-section of the fixing member 4 is a regular hexagon.

[0056] The fixing member 4 is of an integral structure or a covering structure, that is, the side part 41 forming the accommodating cavity is integrally formed, and the conductive fiber bundle 3 is installed in the accommodating cavity in an interpenetrating manner. With such a structure, the stability of the structure of the fixing member 4 can be ensured during the formation of the deformed part, and the loosening of the conductive fiber can be avoided. Of course, the fixing member 4 can also be a covering structure formed by a strip-shaped fixing piece, which is bent and covered on the circumferential side of the conductive fiber bundle 3, and then fixed by other fixing structures. For example, it is clamped and matched with the mounting holes on the fixing ring, or adhered by glue, etc.

[0057] Please refer to Figure 5 , the present utility model also provides a conductive ring, which includes a fixing ring 5 and the above conductive brush installed in the conductive ring. Among them, the fixing ring 5 is of a ring structure, and a plurality of mounting holes 51 are opened along the radial direction of the fixing ring 5. The mounting holes 51 penetrate through the fixing ring 5 along the radial direction. The conductive brush is inserted into the mounting holes 51. A plurality of fixing holes 52 are arranged in the axial direction of the fixing ring 5. The fixing holes 52 are blind holes, and the plurality of blind holes correspond to the plurality of mounting holes 51 one by one. By externally squeezing the bottom of the blind hole to deform it towards the direction of the mounting hole 51, the bottom of the blind hole presses the fixing member 4 of the conductive brush against the inner wall of the mounting hole 51, thereby realizing the fixation of the conductive brush and avoiding the influence on the protection effect of the conductive brush on the motor bearing due to the displacement of the conductive brush.

[0058] Please refer to Figure 7 , in an embodiment, the mounting holes 51 do not penetrate through the fixing ring 5. When the conductive brush is installed, it is inserted into the mounting holes 51 from the inner side of the fixing ring 5. Preferably, the mounting holes 51 on the fixing ring 5 can also be arranged in a double layer, and the projections of the double-layer mounting holes 51 in the axial direction of the fixing ring 5 do not overlap or partially overlap, so that the fiber bundles of the conductive brush are arranged more densely, and when the conductive ring is installed on the output shaft of the motor, the cleaning effect of the conductive brush is improved.

[0059] In other embodiments, the fixing ring 5 can also be separately provided and includes two parts, a first body and a second body that are butt-jointed with each other. The first body is provided with a fixing groove for installing the conductive brush. The fixing groove is adapted to the shape of the fixing member 4 of the conductive brush. The conductive brush is fixed within the fixing ring 5 by closing and fixing the first body and the second body, which facilitates the replacement and installation of the conductive brush. Of course, a fixing groove can also be provided on the second body, or fixing grooves can be provided on both the first body and the second body, and the fixing member 4 is fixed by the cooperation of the fixing grooves on the first body and the second body.

[0060] Please refer to Figure 6 , in addition, the fixing method of the conductive brush can also be other forms. For example, fixing holes 52 are axially provided in the fixing ring 5. The fixing holes 52 penetrate from the surface of the fixing ring 5 to the installation holes 51. The fixing holes 52 correspond to the installation holes 51 one by one and are communicated with the installation holes 51. By providing a pin 6 in the fixing holes 52 to abut against the fixing member 4 of the conductive brush, the conductive brush is thus abutted within the installation holes 51, etc. Of course, the conductive brush can also be fixed by other forms, as long as the above effects can be achieved, and no specific limitation is made here.

[0061] The technical features of the above-described embodiments can be arbitrarily combined. For the sake of brevity of description, not all possible combinations of the various technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0062] The above-described embodiments only represent several implementation manners of the present utility model. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A conductive brush, characterized in that: The conductive brush comprises a conductive fiber bundle and a fixing member for fixing the conductive fiber bundle, the fixing member comprises side portions which are sequentially connected to form a receiving cavity, the cross section of the receiving cavity is a polygon or a quasi-polygon, the fixing fiber bundle is inserted into the receiving cavity and at least one end extends out of the receiving cavity, and the conductive fiber bundle is interference-fitted with the fixing member; and The interference fit between the conductive fiber bundle and the fixing member is such that the axial pull-off resistance of the conductive fiber bundle is at least 100N, and / or The ratio of the maximum value to the minimum value of the distance between the center of the conductive fiber bundle and the midpoint of each side of the polygon or quasi-polygon is any value between 1 and 2.

2. The conductive brush according to claim 1, characterized in that An inner fillet is formed between the inner surfaces of two adjacent side portions, an outer fillet is formed between the outer surfaces of two adjacent side portions, and the radius of at least one of the inner fillets is not less than the radius of the corresponding outer fillet.

3. The conductive brush according to claim 1, characterized in that At least part of the side portion is configured as a deformation portion that deforms inwardly under the action of an external force after the conductive fiber is installed on the fixing member.

4. The conductive brush according to claim 1, characterized in that: The inner wall surface of the fixing piece is a combined surface consisting of a flat surface and a curved surface.

5. The conductive brush according to claim 1, characterized in that: In the axial direction of the fixing member, at least a portion of the accommodating cavity has a cross-section that is polygonal or quasi-polygonal.

6. The conductive brush according to claim 3, characterized in that: All side portions of the fixing member are deformation portions, and the fixing member is configured such that the cross section of the accommodating cavity is transformed from a circle to a regular polygon or a regular polygon under the action of an external force.

7. The conductive brush according to claim 1 or 6, characterized in that: The cross section of the fixing piece is a regular hexagon or a regular hexagon.

8. The conductive brush according to claim 1, characterized in that: The fixing member is an integrated structure or a covering structure.

9. A conductive ring, characterized in that: The conductive ring comprises a fixing ring and the conductive brush according to any one of claims 1 to 8 installed in the conductive ring.

10. A motor, characterized in that: The motor comprises the conductive ring according to claim 9 mounted on the output shaft of the motor.

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