Press-mounted conducting ring and motor

Abstract

The utility model provides a press-fitting conducting ring and a motor, and belongs to the technical field of conducting rings, the press-fitting conducting ring comprises an annular piece, and the annular piece is provided with at least one press-fitting hole; one part of the conductive fiber bundle is arranged in the metal pipe in a penetrating manner, the metal pipe tightly hoops the conductive fiber bundle, the inner pipe wall of the metal pipe is attached to the conductive fiber bundle, the metal pipe is inserted into the press-fitting hole, and the metal pipe is in interference fit with the press-fitting hole; the beneficial effects of the utility model are that the conductive fiber bundle can be implanted into the metal tube and forms the conductive brush in a pre-riveting manner, then the conductive brush can be pressed into the press-fitting hole, and in the press-fitting process, the metal tube shrinks and deforms due to the radial extrusion force of the press-fitting hole, so that the metal tube is in interference fit with the press-fitting hole, and the press-fitting effect is improved. The metal pipe and the annular piece are fixed together, the deformed metal pipe firmly hoops the conductive fiber bundle, and the metal pipe and the conductive fiber bundle are combined together in a surface contact mode, so that the conductive performance and the riveting strength are ensured, and the conductive fiber bundle cannot be broken.

Description

Technical Field

[0001] This utility model belongs to the field of conductive ring technology, and relates to a press-fit conductive ring and a motor. Background Technology

[0002] In motor systems powered by variable frequency drives (VFDs), the rapid switching of power conversion devices introduces high-order harmonic components into the power supply voltage. Under the influence of voltage pulse waveforms, electromagnetic induction occurs between the stator and rotor windings, causing changes in the shaft voltage through distributed parameters. This generates shaft voltage. When the oil film between the motor shaft and bearing breaks down, a circuit is formed, resulting in shaft current. Additionally, three-phase current asymmetry, magnetic reluctance imbalance, and static charge accumulation can also generate shaft current. Because the shaft current in a motor system is transient, it radiates high-intensity electromagnetic waves during these changes, severely impacting the system's electromagnetic compatibility. Furthermore, excessive shaft current can lead to bearing electrolytic corrosion, affecting the motor's lifespan.

[0003] Taking new energy vehicle motors as an example, as current flows through the bearings, electro-corrosion occurs on the surfaces of the bearing races and balls, leading to a gradual decline in the vehicle's power performance. When the vehicle eventually becomes unable to move due to insufficient power, it means that the motor bearings have been severely damaged. Specifically, the grease darkens to black, and erosion pits are visible on the surfaces of the bearing races and balls. These particulate materials generated by electro-corrosion are sealed inside the bearing, further accelerating the bearing's wear process and significantly shortening its service life.

[0004] To address the problem caused by shaft current, existing technologies typically employ a conductive ring on the motor shaft. The conductive ring, a metal ring, is fitted around the outer circumference of the motor shaft, and a conductive brush, comprising bundles of conductive fibers, is fixed to its inner side. When the motor shaft rotates, the conductive fiber bundles remain in contact with the shaft, and grounding occurs through the conductive brush, thus discharging the shaft current.

[0005] In the production process of conductive rings, the installation of conductive fiber bundles is a key challenge in the manufacturing process. Currently, the industry generally uses traditional riveting technology to connect the ring body and the conductive fiber bundles. However, traditional riveting methods have some shortcomings: the riveting points only form point-to-line contact, resulting in unstable conductivity between the ring body and the conductive fiber bundles, insufficient riveting strength, and a tendency to cause fiber breakage. Utility Model Content

[0006] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a press-fit conductive ring and a motor.

[0007] The objective of this utility model can be achieved through the following technical solution: a press-fit conductive ring, comprising:

[0008] An annular component is provided with at least one press-fit hole, which is arranged radially along the annular component. The two ends of the press-fit hole are an inner end and an outer end, respectively. The inner end is located on the inner circumferential surface of the annular component, and the outer end is located on the outer circumferential surface of the annular component.

[0009] The conductive brush is provided in a one-to-one correspondence with the number of the pressing holes. Each conductive brush includes a metal tube and a conductive fiber bundle. A portion of the conductive fiber bundle passes through the metal tube and is clamped to the conductive fiber bundle. The inner wall of the metal tube is in contact with the conductive fiber bundle. The metal tube is inserted into the pressing hole and is interference-fitted with the pressing hole.

[0010] Preferably, one end of the metal tube is provided with an outer chamfer, and the outer diameter of the end of the outer chamfer is smaller than the aperture of the outer port.

[0011] Preferably, the outer port is provided with an inner chamfer for guiding the conductive brush into the press-fit hole, and the diameter of the inner chamfer is larger than the original outer diameter of the metal tube.

[0012] Preferably, the press-fit hole is configured as a tapered hole structure with a gradually decreasing diameter along the direction from the outer port to the inner port.

[0013] Preferably, the interference fit between the metal tube and the press-fit hole gradually increases along the direction from the outer port to the inner port.

[0014] Preferably, the press-fitting hole is configured as a conical hole structure with a linearly varying diameter, or the press-fitting hole is configured as a trumpet hole structure with a non-linearly varying diameter.

[0015] Preferably, the press-fit hole has a critical position, a tapered section is formed between the outer port and the critical position, and a clamping section is formed between the critical position and the inner port, wherein the diameter of the tapered section gradually decreases from the outer port to the critical position.

[0016] Preferably, the clamping hole section is configured as a cylindrical hole with a constant diameter.

[0017] Preferably, the tapered section is configured as a conical hole structure with a linearly varying aperture, or the tapered section is configured as a trumpet hole structure with a non-linearly varying aperture.

[0018] Preferably, the metal tube is provided with at least one pre-compression part for initially fixing the conductive fiber bundle. In its original state, the metal tube can initially press the conductive fiber bundle by the pre-compression part, thereby forming a preform between the metal tube and the conductive fiber bundle.

[0019] Preferably, the pre-compression section is configured to protrude from the wall of the metal tube into the tube.

[0020] Preferably, the pre-compression section is configured as an elongated protrusion; the length direction of the pre-compression section is arranged along the axial direction of the metal tube, or the length direction of the pre-compression section is arranged along the circumferential direction of the metal tube.

[0021] Preferably, there are multiple pre-compression sections, and the pressing surfaces of the multiple pre-compression sections and the conductive fiber bundle are wavy.

[0022] Preferably, there are multiple press-fit holes, and each press-fit hole is arranged circumferentially along the annular part.

[0023] Preferably, the annular component is made of aluminum alloy, copper, copper alloy, or stainless steel.

[0024] Preferably, the conductive fiber bundle is composed of several conductive monofilaments.

[0025] Preferably, an annular cooling groove is formed on at least one annular surface of the annular member.

[0026] Preferably, one end of the conductive fiber bundle extends out of the inner port, or one end of the conductive fiber bundle extends out of the outer port.

[0027] An electric motor includes the press-fitted conductive ring, and further includes a housing and a main shaft, with one of the annular element and the conductive fiber bundle connected to the housing and the other connected to the main shaft.

[0028] Preferably, the outer circumferential surface of the annular component is fixedly connected to the housing, and one end of the conductive fiber bundle extends from the inner port of the annular component and contacts the main shaft.

[0029] Preferably, the main shaft passes through the shaft hole of the annular member, and the annular member is circumferentially fixedly connected to the main shaft. One end of the conductive fiber bundle extends from the outer port of the annular member and contacts the housing.

[0030] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0031] 1. Conductive fiber bundles can be implanted into metal tubes and formed into conductive brushes through pre-riveting. Then, the conductive brushes can be press-fitted into the press-fitting holes. During the press-fitting process, the metal tube shrinks and deforms under the radial extrusion force of the press-fitting holes, thereby making the metal tube and the press-fitting holes interference fit, ensuring that the metal tube and the ring are fixed together. The deformed metal tube firmly clamps the conductive fiber bundles and the two are joined together by surface contact, ensuring conductivity and riveting strength, and the conductive fiber bundles will not break.

[0032] 2. The inner wall of the metal tube firmly holds and tightens the conductive fiber bundle. This design is very important, as it ensures that the outer circumference of the conductive fiber bundle is completely in contact with the inner wall of the metal tube, achieving a surface-to-surface contact effect. Meanwhile, the outer wall of the metal tube is in surface-to-surface contact with the wall of the press-fit hole. The metal tube acts as a conductor between the conductive fiber bundle and the annular component. This surface-to-surface contact design significantly improves the conductivity between the conductive fiber bundle and the annular component. Since the metal tube tightens the conductive fiber bundle with its entire inner wall, it prevents the conductive fiber bundle from breaking.

[0033] 3. As the metal tube clamps the conductive fiber bundle through its entire inner wall surface, during the process of pressing the metal tube into the press-fitting hole, the press-fitting hole forces the metal tube to be subjected to radial extrusion force, which in turn causes the metal tube to shrink and deform. The metal tube itself clamps the conductive fiber bundle a second time through shrinkage and deformation, which further enhances the clamping force of the metal tube on the conductive fiber bundle and greatly improves the connection strength between the metal tube and the conductive fiber bundle.

[0034] 4. The conductive fiber bundle and the metal tube are fixed together by a full-circumference covering contact method, which avoids the problem of unstable conductivity caused by point-line contact. In addition, this surface-to-surface contact method increases the contact area, which not only ensures the stability of the conductive brush, but also solves the defect of high resistance caused by point-line contact, resulting in lower resistance among the conductive fiber bundle, metal tube and ring component.

[0035] 5. The metal tube undertakes the "deformation" task, meaning it deforms during assembly, while the annular component acts as a rigid carrier, bearing only the low stress transmitted by the metal tube. Throughout the assembly process, the metal tube achieves an interference fit with the press-fit hole through "deformation," and further tightens the conductive fiber bundle. Therefore, the deformation of the annular component is greatly suppressed. The annular component undergoes almost no deformation or only minimal deformation throughout the process, significantly reducing the impact on the annular component's dimensions during assembly. This ensures that the annular component's dimensions and roundness remain within acceptable limits after assembly, and greatly reduces dimensional fluctuations. Attached Figure Description

[0036] Figure 1This is a schematic diagram of the press-fit conductive ring of this utility model.

[0037] Figure 2 This is a schematic diagram of the conductive brush and annular component of this utility model before press-fitting.

[0038] Figure 3 This is a structural schematic diagram of Embodiment 1 of the present invention.

[0039] Figure 4 This is a schematic diagram of the structure of Embodiment 2 of this utility model.

[0040] Figure 5 This is a schematic diagram showing the radial extrusion force exerted on the metal tube when it is pressed into the press-fit hole according to this utility model.

[0041] Figure 6 This is a half-sectional schematic diagram of the press-fit conductive ring of this utility model.

[0042] Figure 7 This is a schematic diagram of the conductive brush of this utility model.

[0043] Figure 8 This is an exploded view of the conductive brush of this utility model.

[0044] Figure 9 This is a schematic diagram of the structure of Embodiment Six of this utility model.

[0045] Figure 10 This is a structural schematic diagram of Embodiment Seven of the present invention.

[0046] Figure 11 This is a structural schematic diagram of Embodiment 8 of the present invention.

[0047] Figure 12 This is a structural schematic diagram of Embodiment Nine of this utility model.

[0048] In the figure, 100 is an annular part; 110 is a press-fit hole; 111 is an inner port; 112 is an outer port; 113 is an inner chamfer; 114 is a tapered section; 115 is a clamping section; 120 is an annular cooling groove; 200 is a conductive brush; 210 is a metal tube; 211 is a pre-pressed section; 212 is an outer chamfer; 220 is a conductive fiber bundle; 300 is a housing; and 400 is a spindle. Detailed Implementation

[0049] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0050] like Figures 1 to 12As shown, a press-fit conductive ring includes: an annular member 100, which has at least one press-fit hole 110 arranged radially along the annular member 100. The two ends of the press-fit hole 110 are an inner end 111 and an outer end 112, respectively. The inner end 111 is located on the inner circumferential surface of the annular member 100, and the outer end 112 is located on the outer circumferential surface of the annular member 100; and conductive brushes 200, the number of which is the same as the number of press-fit holes 110 and is arranged in a one-to-one correspondence. Each conductive brush 200 includes a metal tube 210 and a conductive fiber bundle 220. A portion of the conductive fiber bundle 220 passes through the metal tube 210, and the metal tube 210 clamps the conductive fiber bundle 220. The inner wall of the metal tube 210 is in contact with the conductive fiber bundle 220. The metal tube 210 is inserted into the press-fit hole 110, and the metal tube 210 and the press-fit hole 110 are interference-fitted.

[0051] The annular component 100 is a metal conductor with a shaft hole, and can be fitted onto the main shaft 400 of the motor. The press-fit hole 110 is used to fix the conductive brush 200. During the insertion of the conductive brush 200 into the press-fit hole 110, it is subjected to radial extrusion force, causing the metal tube 210 to shrink and deform, thereby making the metal tube 210 and the press-fit hole 110 interference fit. The interference fit fixes the conductive brush 200 and the annular component 100 together.

[0052] The metal tube 210 has high conductivity and elastic deformation capability. The original outer diameter of the metal tube 210 is slightly larger than the press-fit hole 110, allowing the metal tube 210 to be pressed into the press-fit hole 110 of the annular member 100 and connected to the annular member 100 through an interference fit, thereby providing a mechanical fixing function. Furthermore, the metal tube 210 is tightly fitted with the conductive fiber bundle 220, serving as the current conduction medium between the conductive fiber bundle 220 and the annular member 100. The conductive fiber bundle 220 is composed of fine metal wires (such as silver fibers) or metallized carbon fibers. A portion of the conductive fiber bundle 220 is implanted into the metal tube 210 and tightened. One end of the conductive fiber bundle 220 extends out of the metal tube 210 and protrudes from the inner port 111 or the outer port 112 of the annular member 100.

[0053] The conductive ring is ingeniously designed and can be assembled by press fitting. The assembly process is as follows: First, the conductive fiber bundle 220 is implanted into the metal tube 210. Then, the metal tube 210 is pre-riveted to initially fix the conductive fiber bundle 220. The outer diameter of the metal tube 210 is slightly larger than the inner diameter of the press fitting hole 110. The metal tube 210 is then pressed into the press fitting hole 110 using a press fitting process (press machine). During the pressing process, the metal tube 210 is subjected to radial extrusion force, which deforms it, resulting in an interference fit between the metal tube 210 and the press fitting hole 110, forming a tight mechanical connection. The conductive fiber bundle 220 is firmly constrained in the metal tube 210 by clamping, thus fixing the conductive fiber bundle 220 to the annular part 100 through the metal tube 210.

[0054] It is important to note that the conductive fiber bundle 220 is implanted into the metal tube 210, and the inner wall of the metal tube 210 firmly holds and tightens the conductive fiber bundle 220. This design is crucial, as it ensures that the outer circumferential surface of the conductive fiber bundle 220 is completely in contact with the inner wall of the metal tube 210, achieving a surface-to-surface contact effect. The outer wall of the metal tube 210 is in surface-to-surface contact with the wall of the press-fit hole 110. The metal tube 210 acts as a conductor between the conductive fiber bundle 220 and the annular component 100. This surface-to-surface contact design significantly improves the conductivity between the conductive fiber bundle 220 and the annular component 100. Since the metal tube 210 tightens the conductive fiber bundle 220 with its entire inner wall, it prevents the conductive fiber bundle 220 from breaking.

[0055] Furthermore, since the metal tube 210 clamps the conductive fiber bundle 220 through its entire inner wall surface, during the process of pressing the metal tube 210 into the press-fit hole 110, the press-fit hole 110 forces the metal tube 210 to be subjected to radial extrusion force, thereby causing the metal tube 210 to shrink and deform. The metal tube 210 itself clamps the conductive fiber bundle 220 a second time through shrinkage and deformation, further enhancing the clamping force of the metal tube 210 on the conductive fiber bundle 220, and greatly improving the connection strength between the metal tube 210 and the conductive fiber bundle 220.

[0056] Compared to traditional riveting methods, this design uses a full-circumference covering contact method to fix the conductive fiber bundle 220 and the metal tube 210 together, avoiding the problem of unstable conductivity caused by point-to-line contact. Furthermore, this surface-to-surface contact method increases the contact area, which not only ensures the stability of the conductive brush 200, but also solves the defect of high resistance caused by point-to-line contact, resulting in lower resistance among the conductive fiber bundle 220, the metal tube 210, and the annular component 100.

[0057] It is also important to note that this design cleverly assigns the "deformation" task to the metal tube 210. The metal tube 210 acts as a deformation carrier during assembly, while the annular component 100 acts as a rigid carrier, bearing only the low stress transmitted by the metal tube 210. Throughout the assembly process, the metal tube 210 achieves an interference fit with the press-fit hole 110 through "deformation," and further tightens the conductive fiber bundle 220. Therefore, the deformation of the annular component 100 is greatly suppressed. Throughout the process, the annular component 100 undergoes almost no deformation or only minimal deformation, significantly reducing the impact on the external dimensions of the annular component 100 during assembly. This ensures that after the conductive ring is assembled, the external dimensions and roundness of the annular component 100 remain within acceptable limits, and greatly reduces dimensional fluctuations in the annular component 100.

[0058] In the traditional structure, the ring part 100 is responsible for "deformation". During riveting, the riveting press squeezes the ring part 100, forcing it to deform and thus riveting it to the conductive fiber bundle. This practice affects the external dimensions and roundness of the ring part 100, resulting in large fluctuations in the size of the conductive ring after riveting, which in turn affects the product quality.

[0059] The conductive fiber bundle 220 can be implanted into the metal tube 210 and formed into a conductive brush 200 by pre-riveting. Then, the conductive brush 200 can be pressed into the pressing hole 110. During the pressing process, the metal tube 210 shrinks and deforms under the radial extrusion force of the pressing hole 110, so that the metal tube 210 and the pressing hole 110 are interference fit, ensuring that the metal tube 210 and the annular part 100 are fixed together. The deformed metal tube 210 firmly clamps the conductive fiber bundle 220 and the two are joined together by surface contact, ensuring conductivity and riveting strength, and the conductive fiber bundle 220 will not break.

[0060] It should be further explained that, when this conductive ring is in use, the conductive fiber bundle 220 is connected to one of the main shaft 400 and the housing 300, and the ring 100 is connected to the other of the main shaft 400 and the housing 300. The current on the main shaft 400 is transmitted to the housing 300 through the conductive ring, thereby protecting the main shaft 400 and the bearing.

[0061] Example 1:

[0062] like Figure 1 , Figure 2 , Figure 3 , Figure 5 As shown, in Embodiment 1, one end of the metal tube 210 is provided with an outer chamfer 212, and the outer diameter of the end of the outer chamfer 212 is smaller than the aperture of the outer port 112.

[0063] The conductive brush 200 (metal tube 210) is pressed into the press-fit hole 110 from the outer port 112. Since the original outer diameter of the metal tube 210 is larger than the diameter of the press-fit hole 110, a transition structure needs to be designed to allow the metal tube 210 to be initially inserted into the press-fit hole 110. Therefore, an outer chamfer 212 is specifically provided at the end of the metal tube 210 that is first inserted into the press-fit hole 110. The outer chamfer 212 is essentially a tapered or arc-shaped transition chamfer structure. The outer chamfer 212 acts as a guide, helping the metal tube 210 to be more easily and accurately aligned and enter the press-fit hole 110. Because the outer diameter of the end of the outer chamfer 212 is smaller than the diameter of the outer port 112, it effectively acts as a guide, allowing the end of the metal tube 210 to slide into the press-fit hole 110 through the outer chamfer 212, avoiding jamming during the initial assembly stage.

[0064] For a conductive brush 200 fixed by an interference fit, forcibly pushing the metal tube 210 into the hole directly may encounter significant resistance, and may even damage the metal tube 210 or the hole wall of the press-fit hole 110. However, by providing an outer chamfer 212, the insertion process of the metal tube 210 can be made smoother, thereby reducing the assembly difficulty.

[0065] Example 2:

[0066] like Figure 1 , Figure 2 , Figure 4 , Figure 5 As shown, in Embodiment 2, the outer port 112 is provided with an inner chamfer 113 for guiding the conductive brush 200 to be pressed into the press-fit hole 110. The diameter of the inner chamfer 113 is larger than the original outer diameter of the metal tube 210.

[0067] The conductive brush 200 (metal tube 210) is pressed into the press-fit hole 110 from the outer port 112. The inner chamfer 113 is located at the outer port 112 of the press-fit hole 110 (i.e., the outer opening of the annular part 100), and is essentially a tapered transition structure. The inner chamfer 113 acts as a guide, helping the metal tube 210 to be more easily and accurately aligned and enter the press-fit hole 110. Since the diameter of the inner chamfer 113 is larger than the original outer diameter of the metal tube 210, it can effectively act as a guide, allowing the end of the metal tube 210 to slide into the press-fit hole 110 through the inner chamfer 113, avoiding jamming during the initial assembly.

[0068] For a conductive brush 200 fixed by an interference fit, forcibly pushing the metal tube 210 into the hole may encounter significant resistance, and could even damage the metal tube 210 or the wall of the press-fit hole 110. However, by providing an inner chamfer 113, the insertion process of the metal tube 210 can be made smoother, thereby reducing assembly difficulty.

[0069] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, Embodiment 1 and Embodiment 2 illustrate two structural designs for guiding the metal tube 210 into the outer port 112. These designs aim to allow the end of the metal tube 210 to smoothly enter the outer port 112 during the initial pressing process, thus making the pressing process smoother. Both designs utilize a chamfered structure to guide assembly; the difference lies in whether the chamfer is located on the metal tube 210 or inside the outer port 112.

[0070] Example 3:

[0071] like Figure 1 , Figure 2 , Figure 5 As shown, in Embodiment 3, the press-fit hole 110 is configured as a tapered hole structure with the hole diameter gradually decreasing along the direction from the outer port 112 to the inner port 111.

[0072] The diameter of the press-fit hole 110 decreases uniformly / non-uniformly from the outside to the inside. The diameter at the outer port 112 is larger, which facilitates the initial insertion of the metal tube 210. As the pressing depth of the metal tube 210 increases, the radial extrusion force on the metal tube 210 increases, and the deformation of the metal tube 210 also increases, causing the interference fit between the metal tube 210 and the press-fit hole 110 to gradually increase.

[0073] The tapered hole structure design allows the metal tube 210 to experience gradually increasing pressure during insertion, resulting in a tighter interference fit. The entire pressing process is smoother, making the interference fit more natural and reducing jamming during pressing.

[0074] The interference fit between the metal tube 210 and the press-fit hole 110 gradually increases from the outer port 112 to the inner port 111. As the interference fit increases gradually from the outside to the inside, the resistance during the pressing of the metal tube 210 rises smoothly from low to high, avoiding the instantaneous high resistance peak at the inlet that occurs in traditional equal interference fit designs. This makes the installation process smoother and reduces the initial insertion difficulty. After the metal tube 210 is pressed into place, it is firmly locked together with the press-fit hole 110 by the large interference fit, greatly enhancing the connection strength between the metal tube 210 and the annular component 100.

[0075] Based on Embodiment 3, the press-fit hole 110 is configured as a conical hole structure with a linearly varying hole diameter, or the press-fit hole 110 is configured as a trumpet hole structure with a non-linearly varying hole diameter.

[0076] When the press-fit hole 110 is designed as a conical hole structure, the press-fit hole 110 tapers linearly with a uniform gradient from the outer port 112 to the inner port 111, resembling a standard cone. When the metal tube 210 is pressed in, the radial extrusion pressure rises uniformly along the axial direction, and the interference fit increases linearly.

[0077] When the press-fit hole 110 is designed as a flared hole structure, the press-fit hole 110 adopts a curved diameter contraction, with slow diameter contraction in the initial section (low resistance guidance) and rapid contraction in the final section (high pressure locking). The flared design can provide a larger entry point at the beginning, significantly improving the success rate of metal tube 210 alignment and initial insertion.

[0078] Example 4:

[0079] like Figures 1 to 6 As shown, in Embodiment 4, the press-fit hole 110 has a critical position, a tapered hole section 114 is formed between the outer port 112 and the critical position, and a clamping hole section 115 is formed between the critical position and the inner port 111. The diameter of the tapered hole section 114 gradually decreases from the outer port 112 to the critical position.

[0080] The diameter of the tapering section 114 gradually decreases linearly or non-linearly, serving to guide and compress the metal tube 210. The diameter of the clamping section 115 remains constant or slightly reduced, forming the locking zone for the final interference fit.

[0081] Based on Example 4, the clamping hole section 115 is set as a cylindrical hole with a constant diameter.

[0082] The clamping hole section 115 occupies most of the entire press-fit hole 110. The main function of the clamping hole section 115 is to lock the metal tube 210 through the principle of interference fit, so that the metal tube 210 and the annular part 100 remain fixed.

[0083] Based on Embodiment 4, the tapered section 114 is configured as a conical hole structure with a linearly varying aperture, or the tapered section 114 is configured as a trumpet hole structure with a non-linearly varying aperture.

[0084] The tapered section 114 narrows linearly / non-linearly, that is, from the outer port 112 to the critical position, the diameter gradually decreases, so the metal tube 210 can be easily inserted into the tapered section 114. The gradual reduction in the diameter of the tapered section 114 provides a smooth transition process, allowing the metal tube 210 to smoothly shrink and deform inward. During this process, the radial extrusion force on the metal tube 210 is relatively uniform.

[0085] Embodiments 3 and 4 represent two different structural designs for the press-fit hole 110. In Embodiment 3, the diameter of the press-fit hole 110 gradually decreases from the outer port 112 to the inner port 111, forming a continuous tapering hole. The interference fit between the metal tube 210 and the press-fit hole 110 gradually increases from the outer port 112 to the inner port 111, ensuring that the metal tube 210 can be firmly locked by the gradually increasing extrusion pressure. Therefore, the press-fit hole 110 in Embodiment 3 is easier to manufacture. In Embodiment 4, the press-fit hole 110 has a segmented structure. From the outer port 112 to the critical position, the diameter gradually decreases to guide the metal tube 210 smoothly into the hole and begin initial fixation. From the critical position to the inner port 111, it can be a cylindrical hole with a constant diameter, providing a stable mechanical locking effect.

[0086] Example 5:

[0087] like Figure 1 , Figure 2 , Figure 9 , Figure 10 As shown, in Embodiment 5, the metal tube 210 is provided with at least one pre-pressing part 211 for initially fixing the conductive fiber bundle 220. In its original state, the metal tube 210 can initially press the conductive fiber bundle 220 by the pre-pressing part 211, thereby forming a preform between the metal tube 210 and the conductive fiber bundle 220.

[0088] The metal tube 210 can be pre-riveted to the conductive fiber bundle 220 through the pre-pressing part 211 to form a prefabricated conductive brush 200. This pre-fixation is not tight; it only initially fixes the metal tube 210 and the conductive fiber bundle 220 together to prevent the conductive fiber bundle 220 from falling off during the process of pressing the metal tube 210 into the press-fitting hole 110. During the process of pressing the metal tube 210 and the conductive fiber bundle 220 as a prefabricated integral structure into the press-fitting hole 110, the metal tube 210 is subjected to radial extrusion force and shrinks inward, thereby tightening the conductive fiber bundle 220 and completely fixing the metal tube 210 and the conductive fiber bundle 220 together. At this time, the conductive fiber bundle 220 cannot be pulled out from the inwardly shrinking metal tube 210, and the metal tube 210 is also interference-fitted with the press-fitting hole 110, thereby fixing the conductive fiber bundle 220 to the press-fitting hole 110.

[0089] The pre-compression section 211 is designed as a local protrusion or radially tapered structure on the inner wall of the metal tube 210. During the processing and assembly of the conductive brush 200, the conductive fiber bundle 220 is first implanted into the metal tube 210, and then the pre-compression section 211 is formed on the metal tube 210. The pre-compression section 211 presses down on the conductive fiber bundle 220, so that the conductive fiber bundle 220 is constrained within the metal tube 210, which facilitates the subsequent pressing of the metal tube 210 and the conductive fiber bundle 220 as a prefabricated whole into the press-fit hole 110.

[0090] It is important to emphasize here that the conductive fiber bundle 220 actually undergoes a secondary locking process. After the conductive fiber bundle 220 is implanted into the metal tube 210, a pre-compression part 211 is formed on the metal tube 210 to provide initial weak constraint (first locking). During the interference fit between the metal tube 210 and the press-fit hole 110, the metal tube 210 shrinks and deforms, thereby completely clamping the conductive fiber bundle 220 through its entire inner wall surface, thus providing strong constraint (secondary locking) to the conductive fiber bundle 220 by the metal tube 210.

[0091] Based on Embodiment 5, the pre-compression section 211 is configured as a structure that protrudes into the tube from the wall of the metal tube 210. These protruding structures enable the conductive fiber bundle 220 and the metal tube 210 to be riveted together, thereby constraining the conductive fiber bundle 220.

[0092] It should be noted that these protruding structures are very small, consisting of tiny protrusions (dots or strips). While ensuring that the conductive fiber bundle 220 is constrained, they will not cause a shearing effect on the conductive fiber bundle 220, thus preventing the conductive fiber bundle 220 from breaking.

[0093] Example 6:

[0094] like Figure 1 , Figure 2 , Figure 9 As shown, based on Embodiment 5, the pre-compression section 211 is configured as an elongated protrusion structure; the length direction of the pre-compression section 211 is arranged along the axial direction of the metal tube 210. This design of the pre-compression section 211 applies axial pressure only to the conductive fiber bundle 220, completely eliminating transverse shear force and preventing the conductive fiber bundle 220 from breaking.

[0095] Example 7:

[0096] like Figure 1 , Figure 2 , Figure 10 As shown, based on Embodiment 5, the pre-compression part 211 is configured as an elongated protrusion structure; the length direction of the pre-compression part 211 is arranged along the circumferential direction of the metal tube 210. This design of the pre-compression part 211 can provide stronger constraint force, thereby making the pre-riveting strength between the conductive fiber bundle 220 and the metal tube 210 higher, and completely eliminating the possibility of the conductive fiber bundle 220 detaching from the metal tube 210.

[0097] In addition to Embodiments 6 and 7 above, the pre-compression part 211 can also be designed as multiple protrusions. The head of the protrusion has a smooth structure, so it will not exert shear force on the conductive fiber bundle 220.

[0098] like Figure 1 , Figure 2 , Figure 9 , Figure 10 As shown, based on the above embodiments, there are multiple pre-compression sections 211, and the multiple pre-compression sections 211 and the pressing surface of the conductive fiber bundle 220 are wavy.

[0099] Multiple pre-compression sections 211 are arranged at intervals to form a wavy pressure surface. This design enhances the constraint force of the pre-compression sections 211 on the conductive fiber bundle 220. Specifically, the wavy pressure surface provides a non-uniform but regular pressure distribution, thereby increasing friction while reducing concentrated stress damage to the conductive fiber bundle 220.

[0100] like Figure 1 , Figure 2 As shown, based on the above embodiment, there are multiple press-fit holes 110, and each press-fit hole 110 is arranged circumferentially along the annular part 100.

[0101] Based on the above embodiments, the annular component 100 is made of aluminum alloy, copper, copper alloy, or stainless steel.

[0102] like Figure 7 , Figure 8 As shown, based on the above embodiment, the conductive fiber bundle 220 is composed of several conductive monofilaments. The conductive monofilaments are typically made of metals or alloys or carbon fibers with good conductivity.

[0103] like Figure 1 As shown, based on the above embodiment, an annular cooling groove 120 is provided on at least one annular surface of the annular member 100. The annular cooling groove 120 can increase the heat dissipation area. The cooling oil in the motor enters the annular cooling groove 120 to cool the conductive ring, and the cooling oil in the motor carries away the heat, avoiding the phenomenon of the conductive brush 200 overheating when the motor is running at high speed.

[0104] Example 8:

[0105] like Figures 1 to 11 As shown, one end of the conductive fiber bundle 220 extends out of the inner port 111. In Embodiment 8, the outer peripheral surface of the annular member 100 is connected to the housing 300, and the conductive fiber bundle 220 extends out of the inner port 111 and into the shaft hole to contact the spindle 400, thereby establishing a current-guiding channel between the spindle 400 and the housing 300 (grounded).

[0106] Example 9:

[0107] like Figures 1 to 10 , Figure 12As shown, one end of the conductive fiber bundle 220 extends out of the outer port 112. In Embodiment Nine, the inner circumferential surface of the annular member 100 is connected to the main shaft 400, and the conductive fiber bundle 220 extends out of the outer port 112 to contact the housing 300, thereby establishing a current guiding channel between the main shaft 400 and the housing 300 (grounded).

[0108] Examples 8 and 9 illustrate two different arrangements of the conductive fiber bundles 220, designed to establish an effective current guiding path between the spindle 400 and the housing 300 (grounded). These two designs achieve the same goal through different contact methods, but each has unique application scenarios and advantages.

[0109] like Figures 1 to 12 As shown, an electric motor includes a press-fitted conductive ring, and also includes a housing 300 and a main shaft 400, wherein one of an annular member 100 and a conductive fiber bundle 220 is connected to the housing 300 and the other is connected to the main shaft 400.

[0110] The motor design utilizes a connection between the press-fit conductive ring, housing 300, and spindle 400, and employs conductive fiber bundles 220 to establish a current path between the ring 100 and the spindle 400 or housing 300, ensuring that the shaft current can be safely diverted, thereby protecting the spindle 400 and bearings.

[0111] like Figures 1 to 11 As shown, based on Embodiment 8, the outer peripheral surface of the annular component 100 is fixedly connected to the housing 300, and one end of the conductive fiber bundle 220 extends from the inner port 111 of the annular component 100 and contacts the main shaft 400.

[0112] like Figures 1 to 10 , Figure 12 As shown, based on Embodiment Nine, the main shaft 400 passes through the shaft hole of the annular member 100, and the annular member 100 is circumferentially fixedly connected to the main shaft 400. One end of the conductive fiber bundle 220 extends from the outer port 112 of the annular member 100 and contacts the housing 300.

[0113] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0114] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0115] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0116] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. A press-fit conductive ring, characterized in that, include: An annular component (100) is provided with at least one press-fit hole (110), the press-fit hole (110) is arranged radially along the annular component (100), and the two ends of the press-fit hole (110) are an inner end (111) and an outer end (112), the inner end (111) is located on the inner circumferential surface of the annular component (100), and the outer end (112) is located on the outer circumferential surface of the annular component (100); A conductive brush (200) is provided, the number of which is consistent with the number of the pressing holes (110) and they are arranged in a one-to-one correspondence. The conductive brush (200) includes a metal tube (210) and a conductive fiber bundle (220). A portion of the conductive fiber bundle (220) is inserted into the metal tube (210). The metal tube (210) clamps the conductive fiber bundle (220). The inner wall of the metal tube (210) is in contact with the conductive fiber bundle (220). The metal tube (210) is inserted into the pressing hole (110) and the metal tube (210) is press-fitted with the pressing hole (110).

2. The press-fit conductive ring as described in claim 1, characterized in that: One end of the metal tube (210) is provided with an outer chamfer (212), and the outer diameter of the end of the outer chamfer (212) is smaller than the aperture of the outer port (112).

3. The press-fit conductive ring as described in claim 1, characterized in that: The outer port (112) is provided with an inner chamfer (113) for guiding the conductive brush (200) to be pressed into the press-fit hole (110), and the diameter of the inner chamfer (113) is larger than the original outer diameter of the metal tube (210).

4. A press-fit conductive ring as described in claim 1, 2, or 3, characterized in that: The press-fit hole (110) is configured as a tapered hole structure with the diameter gradually decreasing along the direction from the outer port (112) to the inner port (111).

5. A press-fit conductive ring as described in claim 4, characterized in that: The interference fit between the metal tube (210) and the press-fit hole (110) gradually increases along the direction from the outer port (112) to the inner port (111).

6. A press-fit conductive ring as described in claim 4, characterized in that: The press-fit hole (110) is configured as a conical hole structure with a linearly varying diameter, or the press-fit hole (110) is configured as a trumpet hole structure with a non-linearly varying diameter.

7. A press-fit conductive ring as described in claim 1, 2, or 3, characterized in that: The press-fit hole (110) has a critical position, and a tapered hole section (114) is formed between the outer port (112) and the critical position. A clamping hole section (115) is formed between the critical position and the inner port (111). The diameter of the tapered hole section (114) gradually decreases from the outer port (112) to the critical position.

8. A press-fit conductive ring as described in claim 7, characterized in that: The clamping hole section (115) is configured as a cylindrical hole with a constant diameter.

9. A press-fit conductive ring as described in claim 7, characterized in that: The tapered section (114) is configured as a conical hole structure with a linearly varying aperture, or the tapered section (114) is configured as a trumpet hole structure with a non-linearly varying aperture.

10. A press-fit conductive ring as described in claim 1, characterized in that: The metal tube (210) is provided with at least one pre-compression part (211) for initially fixing the conductive fiber bundle (220). In its original state, the metal tube (210) can initially press the conductive fiber bundle (220) by the pre-compression part (211), thereby forming a preform between the metal tube (210) and the conductive fiber bundle (220).

11. A press-fit conductive ring as described in claim 10, characterized in that: The pre-compression section (211) is configured to protrude into the tube from the wall of the metal tube (210).

12. A press-fit conductive ring as described in claim 11, characterized in that: The pre-pressing part (211) is configured as a long strip-shaped protrusion structure; the length direction of the pre-pressing part (211) is arranged along the axial direction of the metal tube (210), or the length direction of the pre-pressing part (211) is arranged along the circumferential direction of the metal tube (210).

13. A press-fit conductive ring as described in claim 10 or 12, characterized in that: The number of the pre-compression parts (211) is multiple, and the pressure surface of the multiple pre-compression parts (211) against the conductive fiber bundle (220) is wavy.

14. A press-fit conductive ring as described in claim 1, characterized in that: The number of press-fit holes (110) is multiple, and each press-fit hole (110) is arranged circumferentially along the annular member (100).

15. A press-fit conductive ring as described in claim 1, characterized in that: The annular component (100) is made of aluminum alloy, copper, copper alloy, or stainless steel.

16. A press-fit conductive ring as described in claim 1 or 10, characterized in that: The conductive fiber bundle (220) is composed of several conductive monofilaments.

17. A press-fit conductive ring as described in claim 1, characterized in that: At least one annular surface of the annular member (100) is provided with an annular cooling groove (120).

18. A press-fit conductive ring as described in claim 1, characterized in that: One end of the conductive fiber bundle (220) extends out of the inner port (111), or one end of the conductive fiber bundle (220) extends out of the outer port (112).

19. An electric motor, characterized in that, The device includes a press-fit conductive ring as described in any one of claims 1 to 18, and further includes a housing (300) and a main shaft (400), with one of the annular element (100) and the conductive fiber bundle (220) connected to the housing (300) and the other connected to the main shaft (400).

20. The motor as described in claim 19, characterized in that: The outer peripheral surface of the annular component (100) is fixedly connected to the housing (300), and one end of the conductive fiber bundle (220) extends from the inner port (111) of the annular component (100) and contacts the main shaft (400).

21. The motor as described in claim 19, characterized in that: The main shaft (400) passes through the shaft hole of the annular member (100), and the annular member (100) is circumferentially fixedly connected to the main shaft (400). One end of the conductive fiber bundle (220) extends from the outer port (112) of the annular member (100) and contacts the housing (300).

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