Magnetic components and their shaft hole mounting units

Abstract

This disclosure relates to a magnetic element and its shaft-hole mounting unit, which includes a connecting shaft, a connecting assembly, and a magnetic ring sleeved on the outer periphery of the connecting assembly. The connecting assembly has a connecting hole extending along a first direction, comprising a first hole segment and a second hole segment arranged along the first direction. The connecting shaft passes through the connecting hole, with the connecting shaft and the second hole segment having an interference fit, while the connecting shaft and the first hole segment have a non-interference fit. Therefore, the connecting shaft only exerts a radial expansion force on the second hole segment, and not on the first hole segment. This shortens the effective length of the connecting shaft's radial expansion force on the connecting hole, effectively reducing the total radial expansion force exerted by the connecting shaft on the connecting hole. Consequently, the total radial expansion force transmitted to the magnetic ring through the connecting assembly is reduced, effectively preventing the magnetic ring from cracking.

Description

Technical Field

[0001] This disclosure relates to the technical field of magnetic elements, and in particular to a magnetic element and its shaft hole mounting unit. Background Technology

[0002] Magnetic components are key components that operate based on electromagnetic principles and are widely used in electrical and electronic systems, power supply circuits, new energy vehicles, photovoltaic inverters, and other fields. Illustratively, in new energy vehicles, commonly used electromagnetic components include the stator in the on-board motor (or drive motor), the on-board charger (OBC), the transformer and inductor in the switching power supply chip, as well as various relays and electromagnetic sensors.

[0003] In the manufacturing process of magnetic components, it is not only necessary to ensure that the magnetic properties of the components meet customer requirements, but also to enable the components to have various special shapes and structures to meet different customer assembly needs. Among the many assembly solutions, shaft-hole mating has become one of the most common and widely used assembly methods due to its high versatility and reliability.

[0004] A magnetic element with a shaft-hole mounting unit includes a connecting assembly with a connecting hole, a connecting shaft passing through the connecting hole into the connecting assembly, and a magnetic ring sleeved on the outer periphery of the connecting assembly. To prevent the connecting shaft from slipping or falling out of the connecting hole during assembly or use, an interference fit is often used to assemble the connecting shaft and the connecting hole, that is, the connecting shaft is forcibly pressed into the connecting hole. However, the interference fit of the connecting shaft will generate a radial expansion force on the connecting hole. This expansion force is transmitted to the magnetic ring on the outer periphery of the connecting assembly, which may lead to cracking of the magnetic ring. Utility Model Content

[0005] Therefore, it is necessary to provide a magnetic element and its shaft hole mounting unit that can prevent the magnetic ring from cracking.

[0006] A shaft hole mounting unit for a magnetic element, comprising:

[0007] Connecting shaft;

[0008] A connecting assembly has a connecting hole extending along a first direction. The connecting hole includes a first hole segment and a second hole segment arranged along the first direction. A connecting shaft passes through the connecting hole. The connecting shaft and the second hole segment are interference-fitted, and the connecting shaft and the first hole segment are non-interference-fitted.

[0009] A magnetic ring is fitted onto the outer periphery of the connecting assembly.

[0010] In one embodiment, the second hole segment is provided with an abutting portion protruding relative to the inner wall of the first hole segment, the abutting portion abutting against the connecting shaft so that the connecting shaft and the second hole segment are in an interference fit.

[0011] In one embodiment, the abutting portion extends circumferentially along the second hole segment to form a closed loop.

[0012] In one embodiment, the height of the abutment portion protruding relative to the inner wall of the first hole is L, where L satisfies: L ≥ 0.15 mm.

[0013] In one embodiment, the length of the abutment portion along the first direction is D, and the length of the connecting component along the first direction is E, wherein D and E satisfy: 0.25E ≤ D ≤ 0.5E.

[0014] In one embodiment, the first hole segment is provided with two sections, which are located on both sides of the second hole segment.

[0015] In one embodiment, the connecting assembly includes a connecting member and an elastic buffer member that are fitted together, the elastic buffer member being disposed between the connecting member and the magnetic ring, and the connecting hole being disposed in the connecting member.

[0016] In one embodiment, a first limiting structure is provided between the connector and the elastic buffer to limit the axial and / or circumferential displacement of the elastic buffer relative to the connector.

[0017] In one embodiment, the first limiting structure includes a first protrusion and a first groove for receiving the first protrusion. One of the first protrusion and the first groove is disposed on the connector, and the other is disposed on the elastic buffer. Two groove walls of the first groove distributed along the first direction respectively stop on the corresponding side of the first protrusion to restrict the movement of the elastic buffer relative to the connector along the first direction.

[0018] And / or, the first limiting structure includes an anti-slip portion for increasing the static friction between the elastic buffer and the connecting member, the anti-slip portion being disposed on the outer peripheral wall of the connecting member and / or on the inner peripheral wall of the elastic buffer.

[0019] In one embodiment, the first protrusion is provided on the connector and extends in a closed ring along the circumference of the connector, and the first groove is provided on the elastic buffer.

[0020] In one embodiment, a second limiting structure is provided between the elastic buffer and the magnetic ring to limit the axial displacement of the magnetic ring relative to the elastic buffer.

[0021] In one embodiment, the second limiting structure includes a second protrusion and a second groove for receiving the second protrusion. One of the second protrusion and the second groove is disposed on the elastic buffer, and the other is disposed on the magnetic ring. Two groove walls of the second groove distributed along the first direction respectively stop on the corresponding side of the second protrusion to restrict the movement of the magnetic ring relative to the elastic buffer along the first direction.

[0022] In one embodiment, an anti-rotation structure is further provided between the elastic buffer and the magnetic ring, the anti-rotation structure being used to restrict the magnetic ring from rotating relative to the elastic buffer along its own axial direction.

[0023] In one embodiment, the anti-rotation structure includes a third protrusion and a third groove that mutually prevent rotation. One of the third protrusion and the third groove is located on the second protrusion, and the other is located on the second groove. The third groove extends along a first direction, and at least two third grooves are provided, and they are arranged at intervals along the circumference of the connector.

[0024] This disclosure also provides a magnetic element including a shaft hole mounting unit as described in any of the preceding embodiments.

[0025] Compared with existing technologies, the shaft-hole mounting unit provided in this disclosure, due to the interference fit between the connecting shaft and the second hole segment, generates a radial expansion force on the second hole segment. However, since the connecting shaft and the first hole segment are not interference-fitted, the connecting shaft does not generate a radial expansion force on the first hole segment. In other words, for the entire connecting hole, only the second hole segment and the connecting shaft have a radial expansion force. This shortens the effective length of the connecting shaft's radial expansion force on the connecting hole, effectively reducing the total radial expansion force exerted by the connecting shaft on the connecting hole. Consequently, the total radial expansion force transmitted to the magnetic ring through the connecting assembly is reduced, effectively preventing the magnetic ring from cracking due to excessive expansion force. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments or conventional technologies of this disclosure, the accompanying drawings used in the description of the embodiments or conventional technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a shaft hole mounting unit according to an embodiment of the present disclosure;

[0028] Figure 2 This is a cross-sectional schematic diagram of a shaft hole mounting unit according to an embodiment of the present disclosure;

[0029] Figure 3 for Figure 2 A magnified view of a section at point M;

[0030] Figure 4 This is a schematic diagram of the structure of a connector according to an embodiment of the present disclosure;

[0031] Figure 5 This is a schematic diagram of the structure of an elastic buffer according to an embodiment of the present disclosure;

[0032] Figure 6 This is a schematic diagram of the structure of a magnetic ring according to an embodiment of the present disclosure.

[0033] Reference numerals: 10, Shaft hole mounting unit;

[0034] 100. Connecting shaft;

[0035] 200. Connecting component; 201. Connecting hole; 2011. First hole segment; 2012. Second hole segment; 202. Abutting part;

[0036] 210. Connector; 211. First groove; 212. Anti-slip part;

[0037] 220. Elastic buffer; 221. First protrusion; 222. Second protrusion; 223. Third groove;

[0038] 300, magnetic ring; 301, second groove; 302, third convex part. Detailed Implementation

[0039] To make the above-described objects, features, and advantages of this disclosure more apparent and understandable, specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this disclosure. However, this disclosure can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this disclosure. Therefore, this disclosure is not limited to the specific embodiments disclosed below.

[0040] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this disclosure are for illustrative purposes only and do not represent the only possible implementation.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] Unless otherwise defined, all technical and scientific terms used in this disclosure have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used in this disclosure includes any and all combinations of one or more of the associated listed items.

[0044] Please see Figures 1 to 6 This disclosure provides a shaft-hole mounting unit 10 for a magnetic element, including a connecting shaft 100, a connecting assembly 200, and a magnetic ring 300 sleeved on the outer periphery of the connecting assembly 200. The connecting assembly 200 has a connecting hole 201 extending along a first direction X. The connecting hole 201 includes a first hole segment 2011 and a second hole segment 2012 arranged along the first direction X. The connecting shaft 100 passes through the connecting hole 201, and the connecting shaft 100 and the second hole segment 2012 are interference-fitted, while the connecting shaft 100 and the first hole segment 2011 are not interference-fitted. That is, the connecting shaft 100 and the first hole segment 2011 are clearance-fitted or transition-fitted.

[0045] It is understandable that, due to the interference fit between the connecting shaft 100 and the second hole section 2012, the connecting shaft 100 will generate a radial expansion force on the second hole section 2012. However, since the connecting shaft 100 and the first hole section 2011 are not interference-fitted, the connecting shaft 100 will not generate a radial expansion force on the first hole section 2011. (See reference...) Figure 2 and Figure 3In other words, for the entire connecting hole 201, there is only a radial expansion force between the second hole segment 2012 and the connecting shaft 100. This shortens the effective length of the radial expansion force exerted by the connecting shaft 100 on the connecting hole 201, effectively reducing the total radial expansion force exerted by the connecting shaft 100 on the connecting hole 201. Consequently, the total radial expansion force transmitted to the magnetic ring 300 through the connecting assembly 200 is reduced, thus effectively preventing the magnetic ring 300 from cracking due to excessive expansion force.

[0046] It should be noted that when the number of the first hole segment 2011 and / or the second hole segment 2012 is greater than one segment, the first hole segment 2011 and the second hole segment 2012 are arranged alternately along the first direction X. This disclosure does not limit the number of the first hole segment 2011 and the second hole segment 2012, as long as the connecting shaft 100 is only interference-fitted with the second hole segment 2012.

[0047] In one embodiment, the second hole segment 2012 is provided with an abutting portion 202 protruding relative to the inner wall of the first hole segment 2011. The abutting portion 202 abuts against the connecting shaft 100, so that the connecting shaft 100 and the second hole segment 2012 are in an interference fit. It can be understood that, because the abutting portion 202 protrudes relative to the inner wall of the first hole segment 2011, the connecting shaft 100 can achieve an interference fit with the second hole segment 2012 while maintaining a non-interference fit with the first hole segment 2011 through the abutting portion 202.

[0048] It should also be noted that, in the circumferential direction of the second hole segment 2012, the abutment portion 202 can be a point, an arc segment with a certain arc length, or extend into a closed ring along the circumferential direction of the second hole segment 2012. This disclosure does not impose any limitations on this, as long as the abutment portion 202 can ensure an interference fit between the second hole segment 2012 and the connecting shaft 100. Furthermore, when the abutment portion 202 is a point, one or more abutment portions 202 can be provided, and these multiple abutment portions 202 can be arranged at intervals along the circumferential direction of the second hole segment 2012. When the abutment portion 202 is a closed ring, one or more abutment portions 202 can be provided, in which case the multiple abutment portions 202 are arranged sequentially along the first direction X within the second hole segment 2012.

[0049] In one embodiment, the abutment portion 202 extends circumferentially along the second hole segment 2012 to form a closed loop. In this case, the diameter of the inner circumferential wall of the abutment portion 202 is the same as the diameter of the inner circumferential wall of the second hole segment 2012. The closed loop abutment portion 202 provides a 360° circumferential, continuous, and uniform clamping force to the connecting shaft 100. The radial expansion force of the connecting shaft 100 on the connecting assembly 200 is evenly distributed on the abutment portion 202, avoiding localized stress concentration that might be caused by point-shaped or arc-shaped abutment portions 202. This prevents cracking of the magnetic ring 300 due to stress concentration, further protecting the magnetic ring 300. Furthermore, the uniformly closed loop abutment portion 202 maximizes the coaxiality between the connecting shaft 100 and the connecting hole 201, effectively preventing the connecting shaft 100 from tilting, shaking, or fretting wear under stress, thereby ensuring the mechanical stability of the shaft hole mounting unit 10 over a long period.

[0050] It should be noted that the diameter A of the first hole section 2011 is larger than the diameter B of the second hole section 2012, and the diameter C of the connecting shaft 100. The relationship between A, B, and C satisfies: A ≥ C > B. For illustration, A - B ≥ 0.3 mm, to ensure that the connecting shaft 100 only has an interference fit with the second hole section 2012 and does not exert radial expansion force on the first hole section 2011. It should also be noted that C / B follows the principle of shaft-hole interference fit; for illustration, refer to the national standard. In actual production, the first hole section 2011, the second hole section 2012, and the connecting shaft 100 will all have certain tolerances. When tolerances exist, the radial pressure of the connecting shaft 100 on the second hole section 2012 should be greater than the radial pressure on the first hole section 2011.

[0051] In one embodiment, the abutment portion 202 protrudes at a height L relative to the inner wall of the first hole segment 2011, where L ≥ 0.15 mm. This ensures a certain distance between the inner peripheral wall of the first hole segment 2011 and the connecting shaft 100, preventing the first hole segment 2011 from contacting the connecting shaft 100. This avoids the connecting shaft 100 pressing against the first hole segment 2011, effectively reducing the total radial expansion force exerted by the connecting shaft 100 on the connecting hole 201. Consequently, the total radial expansion force transmitted to the magnetic ring 300 through the connecting assembly 200 is reduced, effectively preventing the magnetic ring 300 from cracking.

[0052] It should be noted that the "height" here refers to the radial distance of the abutment portion 202 from the connecting hole 201, as shown in the reference. Figure 3 As shown.

[0053] In one embodiment, the length of the second hole segment 2012 along the first direction X is D, and the length of the connecting assembly 200 along the first direction X is E, where D and E satisfy: 0.25E ≤ D ≤ 0.5E. It is understood that, due to the interference fit between the connecting shaft 100 and the second hole segment 2012—that is, the diameter of the connecting shaft 100 is slightly larger than the diameter of the second hole segment 2012—when the connecting shaft 100 is assembled in the connecting hole 201, the elastic deformation of the connecting assembly 200 allows for a tight connection between the connecting assembly 200 and the connecting shaft 100. The connecting assembly 200 itself can dissipate this elastic deformation without causing the magnetic ring 300 to crack. It is also understandable that if D > 0.5E, it indicates that the second hole segment 2012 is too long, meaning the interference fit area is too long. The total radial expansion force generated by the connecting shaft 100 on the connecting hole 201 is too large, potentially exceeding the elastic deformation absorption limit of the connecting component 200's own material. In this case, the residual assembly stress that is not completely dissipated will be transmitted to the magnetic ring 300, leading to a risk of cracking. If D is less than 0.25E, it indicates that the second hole segment 2012 is too short, meaning the interference fit area is too short. The effective contact and clamping area between the connecting shaft 100 and the second hole segment 2012 is insufficient, resulting in a weak connection strength between the connecting component 200 and the connecting shaft 100. This can lead to slippage or loosening of the connecting shaft 100, thus affecting the stability of the shaft hole mounting unit 10. Therefore, limiting D to the range of 0.25E to 0.5E achieves the best balance between ensuring the connection strength of the shaft hole mounting unit 10 and avoiding the risk of cracking of the magnetic ring 300. In this way, the connection strength between the connecting component 200 and the connecting shaft 100 can be guaranteed, and the radial expansion force of the connecting shaft 100 on the connecting component 200 can be prevented from exceeding the absorption limit of the connecting component 200.

[0054] For illustrative purposes, D can be 0.25E, 0.3E, 0.35E, 0.4E, 0.45E, 0.5E, or any other value within the range of 0.25E ≤ D ≤ 0.5E.

[0055] It should also be noted that, in this embodiment, since the abutment portion 202 is a closed ring extending along the inner peripheral wall of the second hole segment 2012, the length of the second hole segment 2012 along the first direction X is also E.

[0056] In one embodiment, the first hole segment 2011 has two segments, located on either side of the second hole segment 2012. It is understood that the two first hole segments 2011 are located at opposite ends of the connecting hole 201 along the first direction X. During the assembly of the connecting shaft 100 and the connecting assembly 200, the connecting shaft 100 will first pass through one of the first hole segments 2011 before entering the second hole segment 2012. Since the diameter of the first hole segment 2011 is larger than the diameter of the second hole segment 2012, regardless of which first hole segment 2011 the connecting shaft 100 enters the connecting hole 201 from, it can first be smoothly guided and initially aligned through the larger diameter first hole segment 2011, thereby ensuring that the connecting shaft 100 can more smoothly enter the middle second hole segment 2012.

[0057] Furthermore, the lengths of each first hole segment 2011 along the first direction X are equal. It can be understood that the two first hole segments 2011 are symmetrically arranged relative to the second hole segment 2012. That is, the second hole segment 2012 is located in the geometric center region of the connecting assembly 200. Therefore, the radial expansion force of the connecting shaft 100 on the connecting assembly 200 can be dispersed from the center region to both ends, forming a symmetrical and smoothly decaying expansion force gradient. This further optimizes the distribution path of the radial expansion force of the connecting shaft 100 on the connecting assembly 200, jointly ensuring that the connecting assembly 200 can more reliably absorb and dissipate elastic deformation, thereby more effectively protecting the magnetic ring 300.

[0058] In one embodiment, the connecting assembly 200 includes a connecting member 210 and an elastic buffer 220 nested together. The elastic buffer 220 is disposed between the connecting member 210 and the magnetic ring 300, and a connecting hole 201 is disposed in the connecting member 210. It is understood that the radial expansion force exerted by the connecting shaft 100 on the connecting member 210 will cause the connecting member 210 to undergo a certain degree of elastic deformation, and will press outward against the elastic buffer 220. Because the elastic buffer 220 has a certain degree of toughness and can undergo elastic deformation, the elastic buffer 220 can fully absorb the radial expansion force, thereby blocking the path of the radial expansion force to the magnetic ring 300 and protecting the magnetic ring 300 from cracking.

[0059] Furthermore, the elastic buffer 220 is made of a soft material that can produce elastic deformation to ensure that it can fully deform and absorb compressive stress when compressed. Schematic, the material of the elastic buffer 220 is plastic, rubber or silicone, etc.

[0060] Furthermore, the connector 210 is a metal component, and the magnetic ring 300 is made of plastic magnetic material. Since the coefficient of thermal expansion of plastic magnetic material and metal material is different, when the temperature changes cause the magnetic ring 300 and the connector 210 to expand and contract to different degrees, the expansion and contraction will cause internal stress between the connecting rod and the magnetic ring 300. The elastic buffer 220 can offset the internal stress through its own deformation, thereby eliminating the risk of the internal stress concentrating on the magnetic ring 300 and causing the magnetic ring 300 to crack.

[0061] In one embodiment, a first limiting structure is provided between the connector 210 and the elastic buffer 220 to limit the displacement of the elastic buffer 220 relative to the connector 210. It should be noted that "displacement" here refers to the elastic buffer 220 displacing relative to the connector 210 along a first direction X, or along the circumference of the connector 210, or simultaneously displacing in both the first direction X and the circumference of the connector 210. That is, the first limiting structure is used to limit the axial and / or circumferential displacement of the elastic buffer 220 relative to the connector 210. This ensures the stability of the relative position between the connector 210 and the elastic buffer 220. Since the magnetic ring 300 is sleeved on the elastic buffer 220, the relative position between the connector 210 and the magnetic ring 300 is also ensured, preventing the magnetic ring 300 from moving relative to the connecting shaft 100 or external components connected to the connecting shaft 100. Furthermore, when the shaft hole mounting unit 10 is applied to a magnetic component, the first limiting structure can effectively resist the slow displacement or loosening that the magnetic ring 300 may produce under conditions such as vibration, temperature cycling or long-term stress that the magnetic component may face, thereby improving the long-term reliability of the magnetic component.

[0062] Furthermore, the first limiting structure includes a first protrusion 221 and a first groove 211 that can accommodate the first protrusion 221. One of the first protrusion 221 and the first groove 211 is provided on the connector 210, and the other is provided on the elastic buffer 220. Two groove walls of the first groove 211, distributed along the first direction X, respectively stop on the corresponding sides of the first protrusion 221 to restrict the movement of the elastic buffer 220 relative to the connector 210 along the first direction X. That is, it restricts the axial displacement of the elastic buffer 220 relative to the connector 210.

[0063] Indicative, in such Figure 2 , Figure 4 and Figure 5 In the illustrated embodiment, the first groove 211 is disposed on the outer peripheral wall of the connector 210, and the first protrusion 221 is disposed on the inner peripheral wall of the elastic buffer 220. Of course, in other embodiments, the first groove 211 may also be disposed on the inner peripheral wall of the elastic buffer 220, in which case the first protrusion 221 is disposed on the outer peripheral wall of the connector 210.

[0064] In one embodiment, a first protrusion 221 is provided on the connector 210 and extends circumferentially along the connector 210 to form a closed ring, while a first groove 211 is provided on the elastic buffer 220. It is understood that the first protrusion 221 extending circumferentially along the connector 210 creates a continuous and complete annular limiting interface between the first protrusion 221 and the first groove 211, eliminating the possibility of torsional displacement of the elastic buffer 220 due to localized stress. Compared to point-like protrusions, the circumferentially extending first protrusion 221 eliminates the slight torsion that may occur due to free segments between limiting points, ensuring extremely high circumferential positional fixation accuracy between the elastic buffer 220 and the connector 210, thereby ensuring the stability of the magnetic ring 300.

[0065] In one embodiment, the first limiting structure includes an anti-slip portion 212 for increasing the static friction between the elastic buffer 220 and the connecting member 210. The anti-slip portion 212 is disposed on the outer peripheral wall of the connecting member 210 and / or the inner peripheral wall of the elastic buffer 220. This not only prevents the elastic buffer 220 from displacing relative to the connecting member 210 along the first direction X, but also prevents the elastic buffer 220 from rotating circumferentially along the connecting member 210.

[0066] Schematic, the anti-slip portion 212 is provided on the outer peripheral wall of the connector 210. The anti-slip portion 212 can be formed by rolling knurling patterns onto the outer wall surface of the connector 210.

[0067] In one embodiment, a second limiting structure is provided between the elastic buffer 220 and the magnetic ring 300 to limit the axial displacement of the magnetic ring 300 relative to the elastic buffer 220. This ensures the stability of the connection position of the magnetic ring 300 relative to the elastic buffer 220 and prevents the magnetic ring 300 from moving relative to the connecting shaft 100 or external components connected to the connecting shaft 100.

[0068] Furthermore, the second limiting structure includes a second protrusion 222 and a second groove 301 that can accommodate the second protrusion 222. One of the second protrusion 222 and the second groove 301 is disposed on the elastic buffer 220, and the other is disposed on the magnetic ring 300. The two groove walls of the second groove 301 distributed along the first direction X respectively stop on the corresponding side of the second protrusion 222 to restrict the movement of the magnetic ring 300 relative to the elastic buffer 220 along the first direction X.

[0069] Indicative, in such Figure 2 , Figure 5 and Figure 6In the illustrated embodiment, the second groove 301 is disposed on the inner peripheral wall of the magnetic ring 300, and the second protrusion 222 is disposed on the outer peripheral wall of the elastic buffer 220. Of course, in other embodiments, the second groove 301 may also be disposed on the outer peripheral wall of the elastic buffer 220, in which case the second protrusion 222 is disposed on the inner peripheral wall of the magnetic ring 300.

[0070] In one embodiment, an anti-rotation structure is further provided between the elastic buffer 220 and the magnetic ring 300, which is used to limit the axial rotation of the magnetic ring 300 relative to the elastic buffer 220 itself.

[0071] Indicatively, the anti-rotation structure can adopt a concave-convex fit structure, or as in the above embodiment, a knurled structure. This disclosure does not limit this, as long as the anti-rotation structure can prevent relative rotation between the magnetic ring 300 and the elastic buffer 220.

[0072] The anti-slip part 212 is provided on the outer peripheral wall of the connector 210. The anti-slip part 212 can be formed by rolling knurling on the outer wall surface of the connector 210.

[0073] In one embodiment, the anti-rotation structure includes a third protrusion 302 and a third groove 223 that are mutually anti-rotation engaged. One of the third protrusion 302 and the third groove 223 is provided in the second protrusion 222, and the other is provided in the second groove 301. The third groove 223 extends along a first direction, and at least two third grooves 223 are provided, and are arranged sequentially at intervals along the circumference of the connector 210.

[0074] Indicative, in such Figure 5 and Figure 6 In the illustrated embodiment, the third protrusion 302 is disposed in the second groove 301, and the third groove 223 is disposed in the second protrusion 222. Obviously, in other embodiments, the third protrusion 302 can also be disposed in the second protrusion 222, in which case the third groove 223 is disposed in the second groove 301.

[0075] This disclosure also provides a magnetic element, including the shaft hole mounting unit 10 as described in any of the preceding embodiments.

[0076] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the scope of protection of this disclosure. Therefore, the patent protection scope of this disclosure should be determined by the appended claims.

Claims

1. A shaft hole mounting unit for a magnetic element, characterized in that, include: Connecting shaft (100); The connecting assembly (200) has a connecting hole (201) extending along a first direction. The connecting hole (201) includes a first hole segment (2011) and a second hole segment (2012) arranged along the first direction. The connecting shaft (100) passes through the connecting hole (201). The connecting shaft (100) and the second hole segment (2012) are interference-fitted, and the connecting shaft (100) and the first hole segment (2011) are non-interference-fitted. A magnetic ring (300) is fitted onto the outer periphery of the connecting assembly (200).

2. The shaft hole mounting unit according to claim 1, characterized in that, The second hole segment (2012) is provided with an abutting part (202) protruding from the inner wall of the first hole segment (2011). The abutting part (202) abuts against the connecting shaft (100) so that the connecting shaft (100) and the second hole segment (2012) are interference fit.

3. The shaft hole mounting unit according to claim 2, characterized in that, The abutting portion (202) extends circumferentially along the second hole segment (2012) to form a closed loop.

4. The shaft hole mounting unit according to claim 2, characterized in that, The height of the abutment part (202) protruding relative to the inner wall of the first hole section (2011) is L, and L satisfies: L ≥ 0.15 mm.

5. The shaft hole mounting unit according to claim 2, characterized in that, The length of the abutting part (202) along the first direction is D, and the length of the connecting component (200) along the first direction is E, where D and E satisfy: 0.25E ≤ D ≤ 0.5E.

6. The shaft hole mounting unit according to claim 5, characterized in that, The first hole segment (2011) is provided in two sections, which are located on both sides of the second hole segment (2012).

7. The shaft hole mounting unit according to any one of claims 1 to 6, characterized in that, The connecting assembly (200) includes a connecting member (210) and an elastic buffer member (220) that are fitted together. The elastic buffer member (220) is located between the connecting member (210) and the magnetic ring (300). The connecting hole (201) is located in the connecting member (210).

8. The shaft hole mounting unit according to claim 7, characterized in that, A first limiting structure is provided between the connector (210) and the elastic buffer (220) to limit the axial and / or circumferential displacement of the elastic buffer (220) relative to the connector (210).

9. The shaft hole mounting unit according to claim 8, characterized in that, The first limiting structure includes a first protrusion (221) and a first groove (211) that can accommodate the first protrusion (221). One of the first protrusion (221) and the first groove (211) is provided on the connector (210), and the other is provided on the elastic buffer (220). Two groove walls of the first groove (211) distributed along the first direction respectively stop on the corresponding side of the first protrusion (221) to restrict the movement of the elastic buffer (220) relative to the connector (210) along the first direction. And / or, the first limiting structure includes an anti-slip part (212) for increasing the static friction between the elastic buffer (220) and the connector (210), the anti-slip part (212) being disposed on the outer peripheral wall of the connector (210) and / or on the inner peripheral wall of the elastic buffer (220).

10. The shaft hole mounting unit according to claim 9, characterized in that, The first protrusion (221) is provided on the connector (210) and extends in a closed ring along the circumference of the connector (210), and the first groove (211) is provided on the elastic buffer (220).

11. The shaft hole mounting unit according to claim 7, characterized in that, A second limiting structure is provided between the elastic buffer (220) and the magnetic ring (300) to limit the axial displacement of the magnetic ring (300) relative to the elastic buffer (220).

12. The shaft hole mounting unit according to claim 11, characterized in that, The second limiting structure includes a second protrusion (222) and a second groove (301) that can accommodate the second protrusion (222). One of the second protrusion (222) and the second groove (301) is provided on the elastic buffer (220), and the other is provided on the magnetic ring (300). Two groove walls of the second groove (301) distributed along the first direction respectively stop on the corresponding side of the second protrusion (222) to restrict the movement of the magnetic ring (300) relative to the elastic buffer (220) along the first direction.

13. The shaft hole mounting unit according to claim 12, characterized in that, An anti-rotation structure is also provided between the elastic buffer (220) and the magnetic ring (300), the anti-rotation structure being used to restrict the magnetic ring (300) from rotating along its own axis relative to the elastic buffer (220).

14. The shaft hole mounting unit according to claim 13, characterized in that, The anti-rotation structure includes a third protrusion (302) and a third groove (223) that mutually prevent rotation. One of the third protrusion (302) and the third groove (223) is located in the second protrusion (222), and the other is located in the second groove (301). The third groove (223) extends along a first direction, and at least two third grooves (223) are provided and are arranged at intervals along the circumference of the connector (210).

15. A magnetic element, characterized in that, Includes the shaft hole mounting unit as described in any one of claims 1 to 14.

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