Hub steel wire anti-electricity corrosion connecting structure

Abstract

The application provides a hub steel wire anti-electric corrosion connecting structure and belongs to the technical field of bicycle hubs. The hub steel wire anti-electric corrosion connecting structure comprises a hub shell, a flange plate arranged on the end face of the hub shell and a steel spoke arranged in a spoke hole of the flange plate. The hub steel wire anti-electric corrosion connecting structure further comprises a metal sleeve embedded in the spoke hole. The outer surface of the metal sleeve is coated with an insulating coating. The two ends of the metal sleeve are respectively provided with flared structures which are respectively matched with the chamfered structures at the two ends of the spoke hole. There is no direct metal-to-metal contact path between the steel spoke and the flange plate. The induced potential generated by the alternating current in the hub motor cannot be conducted from the hub shell to the steel spoke through the spoke hole, so that the electric conduction loop of the shaft current is completely cut off, the electric corrosion damage at the connection between the hub shell and the steel spoke is effectively avoided, and the service life of the hub and the steel spoke is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of bicycle wheel hub technology, specifically relating to a wheel hub steel wire anti-electrolytic corrosion connection structure. Background Technology

[0002] It is an electric bicycle wheel hub with a built-in motor. The hub housing is usually part of the motor's magnetic circuit and carries alternating current and induced electromotive force during operation. The spoke holes are directly opened on the flange on the end face of the hub housing, and the spoke bends of the wire spokes pass directly through and abut against the end face of the flange. At this time, there is a direct metal-to-metal contact between the wire spokes and the hub housing.

[0003] However, in practical use, the inventors have discovered that the induced electromotive force generated by the alternating current inside the hub motor acts on the hub housing. When the wire spokes and the flange form a metal conductor path at the spoke hole, the shaft current is conducted from the hub housing through this contact point to the wire spokes. Under humid or conductive conditions, this contact interface will suffer electro-erosion damage due to the current flow, i.e., localized high-temperature melting or material transfer occurs at the contact point. This electro-erosion not only damages the structural strength of the flange and wire spoke connection, leading to spoke loosening or breakage, but also affects the dynamic balance and service life of the hub due to the accumulation of corrosion products. Therefore, there is also the problem of hub connection structure failure and safety hazards caused by electro-erosion.

[0004] Meanwhile, to achieve vehicle lightweighting, magnesium alloys are increasingly being used in wheel hub housings. However, magnesium alloys have relatively low hardness and yield strength, and the bends of the steel spokes are in point contact or small-area contact with the flange end face. Under vehicle vibration and high load conditions, the tension of the steel spokes will be concentrated on the very small contact surface of the magnesium alloy flange, resulting in excessively high pressure per unit area. Over time, this can easily cause plastic deformation and denting around the spoke holes of the magnesium alloy flange. In severe cases, the spoke holes may even crack, and the spokes may loosen and break, further exacerbating the failure risk and safety hazards of the wheel hub connection structure. Summary of the Invention

[0005] The purpose of this invention is to provide a wheel hub steel wire anti-electro-erosion connection structure, which aims to solve the problems in the prior art where wheel hub shells are prone to electro-erosion and magnesium alloy wheel hubs are prone to crushing deformation and breakage due to point contact of steel wires.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a hub steel wire anti-electro-erosion connection structure, comprising a hub housing, a flange disposed on the end face of the hub housing, and steel wire spokes passing through the spoke holes of the flange, and further comprising: a metal sleeve, embedded in the spoke holes, the outer surface of the metal sleeve being coated with an insulating coating, and flared structures being provided at both ends of the metal sleeve, the flared structures being fitted with the chamfered structures at both ends of the spoke holes, the metal sleeve being fixed in the spoke holes by the tapered interference fit between the flared structures at both ends and the chamfered structures at both ends of the spoke holes.

[0007] A further technical solution of the present invention is that the insulating coating is a polytetrafluoroethylene coating, and the polytetrafluoroethylene coating covers the entire outer surface of the metal sleeve and the entire surface of the isolation flange.

[0008] A further technical solution of the present invention is that the thickness of the polytetrafluoroethylene coating is 0.03 mm to 0.08 mm.

[0009] A further technical solution of the present invention is that chamfer structures are provided at both ends of the spoke hole, the chamfer located on the inner end face of the flange is an inner chamfer, and the chamfer located on the outer end face of the flange is an outer chamfer. The inner chamfer and the outer chamfer are symmetrically arranged on the axial section of the spoke hole.

[0010] A further technical solution of the present invention is that the edges of the two ends of the metal sleeve extend radially outward to form isolation flanges, which are attached to the two end faces of the flange to separate the spoke bends of the wire spokes from the flange.

[0011] A further technical solution of the present invention is that the flaring structure includes an inner flaring and an outer flaring, wherein the flaring angle of the inner flaring is equal to the conical angle of the inner chamfer of the spoke hole, and the flaring angle of the outer flaring is equal to the conical angle of the outer chamfer of the spoke hole.

[0012] A further technical solution of the present invention is that the axial depth of the inner end flare is less than or equal to the axial depth of the inner chamfer of the spoke hole, and the axial depth of the outer end flare is less than or equal to the axial depth of the outer chamfer of the spoke hole.

[0013] A further technical solution of the present invention is that the middle part of the metal sleeve is a straight cylindrical section of equal diameter, and the outer diameter of the straight cylindrical section is smaller than the inner diameter of the middle straight hole section of the spoke hole, forming a clearance fit.

[0014] A further technical solution of the present invention is that the spoke bend of the steel wire spoke passes through the inner hole of the metal sleeve, the head of the spoke bend abuts against the outer side of the isolation flange, the bent part of the spoke bend spans the outer side of the isolation flange, and the inner arc of the bent part of the spoke bend contacts the outer side of the isolation flange.

[0015] A further technical solution of the present invention is that the isolation flange extends outward from the port edge of the spoke hole along the end face of the flange by a predetermined radial width, the radial width being greater than the outer diameter of the head of the spoke bend.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. By coating the outer surface of the metal sleeve and the entire surface of the isolation flange with an insulating coating, preferably polytetrafluoroethylene (PTFE), and embedding the metal sleeve inside the spoke hole, the inner wall of the straight section of the metal sleeve completely separates the spoke bend from the spoke hole wall. The isolation flanges at both ends of the metal sleeve completely separate the head and bend of the spoke bend from the inner and outer end faces of the flange. There is no direct metal-to-metal contact path between the wire spoke and the flange. The induced electromotive force generated by the alternating current inside the hub motor cannot be conducted from the hub housing through the spoke hole to the wire spoke, thus completely cutting off the conductive circuit of the shaft current. This effectively avoids electrolytic corrosion damage at the connection between the hub housing and the wire spoke, extending the service life of the hub and the wire spoke.

[0017] 2. By setting isolation flanges at both ends of the metal sleeve to fit against the inner and outer end faces of the flange, and extending the isolation flanges radially outward from the edge of the spoke hole port along the flange end face by a predetermined width, the head of the spoke bend abuts against the outer side of the isolation flange without directly contacting the inner end face of the flange. Simultaneously, the bent portion of the spoke bend spans the outer side of the isolation flange, with the inner arc of the bent portion contacting the outer side of the isolation flange without directly contacting the outer end face of the flange. The tension of the wire spokes first acts on the isolation flange, and then is evenly transmitted to the flange through the flared structure at both ends of the metal sleeve and the conical surface between the chamfers at both ends of the spoke hole. Addressing the relatively low hardness and yield strength of magnesium alloy wheel hub materials, this solution transforms the traditional point / small-area contact between the spoke elbow and the flange into a ring-shaped surface contact for force transmission. This significantly increases the stress-bearing area and evenly distributes the pressure per unit area, effectively preventing the steel wire spokes from crushing the magnesium alloy flange under heavy loads and vibrations. It also eliminates failure phenomena such as plastic deformation, denting, and even long-term fracture around the spoke holes, significantly improving the structural durability and operational safety of the magnesium alloy wheel hub. Compared to existing technologies where the spoke elbow directly forms point or small-area contact with the flange end face, this solution transforms the spoke tension transmission from point contact to surface contact, greatly increasing the stress-bearing area and effectively preventing localized extrusion damage to the flange end face from the spoke elbow. This ensures the connection reliability and safety of the wheel hub structure during long-term use.

[0018] 3. The metal sleeve adopts a one-piece molded composite structure. The metal substrate of the sleeve itself has sufficient structural strength to stably bear the long-term tension of the spokes. The entire outer surface of the metal sleeve is covered with a polytetrafluoroethylene insulating coating, which can not only isolate metal contact and eliminate the risk of electrolytic corrosion, but also reduce the pressure resistance of the metal sleeve and reduce assembly losses due to the lubrication properties of the coating. The flared ends and isolation flanges of the metal sleeve are integrally processed and formed, eliminating the need for additional insulating gaskets and insulating sleeves, reducing the number of parts, simplifying the assembly process, and reducing production and manufacturing costs. Moreover, the integrated insulation structure can achieve isolation without dead corners, and there is no situation where the insulating parts shift, fall off or fail during long-term vehicle vibration. The overall structural stability and durability are greatly improved. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the hub housing structure in a specific embodiment of the present invention; Figure 2 This is a cross-sectional view of the hub housing in a specific embodiment of the present invention; Figure 3 This is a schematic diagram of the metal sleeve in a specific embodiment of the present invention; Figure 4 This is a cross-sectional view of the metal sleeve in a specific embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the steel wire spokes in a specific embodiment of the present invention.

[0020] In the diagram: 1. Hub housing; 2. Flange; 3. Wire spokes; 4. Metal sleeve; 21. Spoke hole; 31. Spoke elbow; 32. Head; 41. Insulating coating; 42. Inner end flare; 43. Outer end flare; 44. Straight section; 211. Inner chamfer; 212. Outer chamfer; 421. Isolation flange. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-5This invention provides the following technical solution: a hub steel wire anti-electro-erosion connection structure. The hub housing 1 is cylindrical in shape with a hollow internal structure to accommodate the stator core, coil, magnets, and other internal components of the hub motor. An opening is provided at one axial end of the hub housing 1. Flanges 2 are integrally formed on both end faces of the hub housing 1, extending radially outward from the edge of the end face of the hub housing 1, forming a plum blossom-shaped flat structure. Multiple spoke holes 21 are evenly distributed around the circumference of the flanges 2, penetrating along the thickness direction of the flanges 2 for the installation of steel wire spokes 3. The number of spoke holes 21 is determined according to the hub size and spoke arrangement, and the centers of all spoke holes 21 are located on the same pitch circle.

[0023] The spoke hole 21 has chamfered structures at both ends. These chamfers gradually expand outward from the inner wall of the spoke hole 21 towards the end face of the flange 2, forming a conical shape. The chamfer located on the inner end face of the flange 2 is called the inner chamfer 211, and the chamfer located on the outer end face of the flange 2 is called the outer chamfer 212. The inner chamfer 211 and the outer chamfer 212 have the same size and angle, and are symmetrically arranged in the axial section of the spoke hole 21. The conical surfaces of the inner chamfer 211 and the outer chamfer 212 smoothly transition to the middle straight hole section of the spoke hole 21, giving the spoke hole 21 an overall profile shape in the axial section where both ends are conical flared and the middle is a straight hole of equal diameter.

[0024] One end of the wire spoke 3 is bent to form a spoke bend 31, which is L-shaped. The bend of the spoke bend 31 has a rounded transition section. The end of the spoke bend 31 is a head 32, which is spherical or hemispherical. The maximum outer diameter of the head 32 is larger than the diameter of the spoke bend 31, and the outer surface of the head 32 is a smooth rounded surface to prevent damage to surrounding components when the spoke comes out of the spoke hole 21. The end of the wire spoke 3 away from the spoke bend 31 is provided with a threaded section. The outer circumference of the threaded section is machined with external threads for threaded engagement with the spoke cap. The tension of the spoke can be adjusted by rotating the spoke cap.

[0025] The spoke bend 31 passes through the spoke hole 21. The head 32 of the spoke bend 31 is located outside the flange 2 and abuts against the outer end face of the flange 2. The shaft portion of the spoke bend 31 extends towards the inside of the hub after passing through the spoke hole 21. The bent portion of the spoke bend 31 spans the inner chamfer 211 end of the spoke hole 21.

[0026] A metal sleeve 4 is provided between the spoke bend 31 and the spoke hole 21, and the metal sleeve 4 is integrally embedded in the spoke hole 21. The metal sleeve 4 has a circular cylindrical structure, and its axial length is equal to the axial length of the spoke hole 21. The outer circumferential surface of the metal sleeve 4 is entirely coated with an insulating coating 41, which is a polytetrafluoroethylene (PTFE) coating. The PTFE coating is uniformly covered on the entire outer surface of the metal sleeve 4 by a spraying process. The thickness is 0.03 mm to 0.08 mm. This thickness range ensures that the coating has sufficient insulation strength and wear resistance, while the PTFE coating also has high ductility, so that when the metal sleeve 4 deforms subsequently, it can extend with the metal substrate without cracking or peeling. At the same time, the coating surface is smooth, which can reduce the assembly resistance of pressing the metal sleeve 4 into the spoke hole 21.

[0027] The metal sleeve 4 has flared structures at both ends. The flared end at one end of the metal sleeve 4 is an inner flared end 42, and the flared end at the other end is an outer flared end 43. The inner flared end 42 and the outer flared end 43 have the same shape and size, both being tapered flared structures extending axially from the port inwards along the metal sleeve 4. The flaring angle of the inner flared end 42 is equal to the conical angle of the inner chamfer 211 of the spoke hole 21, and the flaring angle of the outer flared end 43 is equal to the conical angle of the outer chamfer 212 of the spoke hole 21. The axial depth of the inner flared end 42 is less than or equal to the axial depth of the inner chamfer 211 of the spoke hole 21, and the axial depth of the outer flared end 43 is less than or equal to the axial depth of the outer chamfer 212 of the spoke hole 21. The outer surfaces of both the inner flared end 42 and the outer flared end 43 are conical surfaces, and these conical surfaces are also coated with a polytetrafluoroethylene coating. By using a conical interference fit to firmly fix the metal sleeve 4, the tension of the steel wire spoke 3 is transformed from local point contact to annular conical surface contact, which evenly distributes the tension and avoids extrusion dents and edge chipping damage at the edge of the spoke hole 21.

[0028] The middle part of the metal sleeve 4 is a straight cylindrical section 44 of equal diameter. The outer diameter of the straight cylindrical section 44 is slightly smaller than the inner diameter of the straight hole section in the middle of the spoke hole 21, forming a clearance fit. The flared roots of the inner end flare 42 and the outer end flare 43 are smoothly connected to the two ends of the straight cylindrical section 44.

[0029] The inner flared end 42 and outer flared end 43 of the metal sleeve 4 are formed by pressing two conical pressing members axially inward from both ends of the metal sleeve 4. The conical pressing member is a frustum-shaped structure with a conical surface on its outer circumference, the taper of which is the same as the required flared end taper. When the conical pressing member is pressed into the port of the metal sleeve 4, its conical surface exerts a radially outward compressive force on the inner wall of the port of the metal sleeve 4, causing the port portion of the metal sleeve 4 to expand radially outward, forming a flared structure with an angle consistent with the chamfered conical surface of the spoke hole 21. After pressing, the outer conical surface of the inner flared end 42 is tightly fitted with the inner chamfered conical surface 211 of the spoke hole 21, and the outer conical surface of the outer flared end 43 is tightly fitted with the outer chamfered conical surface 212 of the spoke hole 21. The metal sleeve 4 is fixed inside the spoke hole 21 by an interference fit between the outer conical surfaces of the two flared ends and the chamfered conical surfaces at both ends of the spoke hole 21.

[0030] The port edges at both ends of the metal sleeve 4 extend radially outward to form isolation flanges 421. Isolation flanges 421 are annular thin-walled structures extending radially outward from the port edges of the inner flared end 42 and the outer flared end 43. Isolation flanges 421 are located on the inner and outer sides of the flange 2 and fit against the inner and outer end faces of the flange 2. Isolation flanges 421 extend radially outward from the port edge of the spoke hole 21 along the inner and outer end faces of the flange 2 by a predetermined radial width. This radial width is greater than the outer diameter of the head 32 of the spoke elbow 31, so that the head 32 of the spoke elbow 31 abuts against the outer side of the isolation flange 421 without directly contacting the inner end face of the flange 2. Simultaneously, the bent portion of the spoke elbow 31 spans the outer side of the isolation flange 421, and the inner arc of the bent portion of the spoke elbow 31 contacts the outer side of the isolation flange 421 without directly contacting the outer end face of the flange 2. The surface of the isolation flange 421 is coated with a polytetrafluoroethylene coating, and the polytetrafluoroethylene coating completely covers the entire surface of the isolation flange 421. The isolation flanges 421 extending outward from both ends of the metal strip 4 are attached to the two end faces of the flange, completely separating the rod body, elbow head, and bending arc of the wire spoke 3 from the metal surface of the flange. There is no direct metal conduction channel, which completely cuts off the shaft current loop formed by the alternating induced electromotive force of the hub motor, eliminating the problems of contact erosion and melt corrosion from the root.

[0031] The spoke elbow 31 passes through the inner hole of the metal sleeve 4. The bent portion of the spoke elbow 31 spans the outer side of the isolation flange 421. The inner arc of the bent portion of the spoke elbow 31 contacts the outer surface of the isolation flange 421, and the head 32 of the spoke elbow 31 abuts against the outer surface of the isolation flange 421. The inner wall of the straight section 44 of the metal sleeve 4 completely separates the body of the spoke elbow 31 from the inner wall of the middle straight section of the spoke hole 21. The isolation flange 421 completely separates the head 32 of the spoke elbow 31 from the inner end face of the flange 2, and completely separates the bent portion of the spoke elbow 31 from the outer end face of the flange 2. The wire spoke 3 does not have any direct metal-to-metal contact with the flange 2 around the spoke hole 21.

[0032] After the spoke elbow 31 is inserted into the inner hole of the metal sleeve 4, the shaft of the spoke elbow 31 passes through the inner hole of the straight section 44 of the metal sleeve 4, and the head 32 of the spoke elbow 31 is located inside the flange 2 and abuts against the outer side of the isolation flange 421. The bent part of the spoke elbow 31 is located outside the flange 2, and the inner arc of the bent part abuts against the outer side of the isolation flange 421. The spoke thread section continues to extend outward for connecting the spoke cap.

[0033] During installation, the metal sleeve 4 is first inserted into the spoke hole 21 from the outside of the flange 2. Then, a press-fitting tool is used to press-fit both ends of the metal sleeve 4 to form flares. The outer conical surfaces of the flares at both ends of the metal sleeve 4 are fully fitted with the chamfered conical surfaces at both ends of the spoke hole 21. At the same time, the isolation flange 421 can also be formed using a press-fitting tool and fitted to the inner end face of the flange 2. The isolation flange 421 is fitted to the outer end face of the flange 2, thus achieving a fixed connection between the metal sleeve 4 and the flange 2. The insulating coating 41 plays a lubricating role during the insertion and press-fitting of the metal sleeve 4, reducing press-fitting resistance. At the same time, the coating extends with the copper substrate during the extrusion deformation at the flared part, maintaining surface integrity.

[0034] Then, the spoke bend 31 of the wire spoke 3 is inserted from the inside to the outside of the flange 2 into the inner hole of the metal sleeve 4. The head 32 of the spoke bend 31 is located outside the flange 2 and abuts against the outer side of the isolation flange 421. The shaft of the spoke bend 31 passes through the inner hole of the straight section 44 of the metal sleeve 4 and extends out from the inside of the flange 2. The bent part of the spoke bend 31 spans the outside of the isolation flange 421, and the inner arc of the bent part abuts against the outer side of the isolation flange 421. Since the inner wall of the metal sleeve 4 is a smooth cylindrical surface and its inner diameter is larger than the outer diameter of the spoke bend 31, the spoke bend 31 will not scrape against the inner wall of the metal sleeve 4 when it is inserted. Finally, the threaded section of the wire spoke 3 is inserted into the spoke hole of the rim, the spoke cap is installed, and the tension is adjusted to the specified value.

[0035] During use, the induced electromotive force generated by the alternating current inside the hub motor acts on the hub housing 1. Because the PTFE coating on the outer surface of the metal sleeve 4 completely electrically isolates the metal sleeve 4 from the flange 2, and the inner wall of the straight section 44 of the metal sleeve 4 completely separates the spoke body of the spoke bend 31 from the wall of the spoke hole 21, the isolation flange 421 completely separates the head 32 of the spoke bend 31 from the inner end face of the flange 2, and the isolation flange 421 completely separates the bent part of the spoke bend 31 from the outer end face of the flange 2, there is no direct metal-to-metal contact path between the wire spoke 3 and the flange 2. Therefore, the induced current cannot be conducted from the hub housing 1 through the spoke hole 21 to the wire spoke 3, thus cutting off the conductive circuit of the shaft current and preventing corrosion of the hub housing 1 by the current at the connection between the hub housing 1 and the wire spoke 3. The flared structures at both ends of the metal sleeve 4 transmit the spoke tension evenly to the flange 2 through a conical fit. The insulating flanges at both ends increase the contact area between the metal sleeve 4 and the flange 2, further dispersing the effect of the spoke tension on the flange 2 and preventing localized extrusion damage to the end face of the flange 2 caused by the spoke elbows 31. The PTFE coating has both insulation and lubrication functions, ensuring the effectiveness of electrical isolation while facilitating the press-fitting operation of the metal sleeve 4.

[0036] Meanwhile, for the hub shell made of magnesium alloy, the high-strength metal sleeve can directly bear the concentrated tension of the steel wire spokes, and through the flared conical surfaces at both ends and the annular isolation flange, the point load is evenly distributed into a surface load and transferred to the magnesium alloy flange. This significantly reduces the unit surface pressure around the spoke holes, avoids the defect that magnesium alloy material is easily crushed and deformed by steel wire due to insufficient hardness and yield strength, and ensures that the hub flange structure does not experience plastic indentation and cracking under heavy load and frequent vibration conditions, thus extending the service life of the magnesium alloy hub.

Claims

1. A hub steel wire anti-electro-erosion connection structure, comprising a hub housing (1), a flange (2) disposed on the end face of the hub housing (1), and steel wire spokes (3) passing through spoke holes (21) in the flange (2), characterized in that, Also includes: The metal sleeve (4) is fitted into the spoke hole (21). The outer surface of the metal sleeve (4) is coated with an insulating coating (41). The two ends of the metal sleeve (4) are respectively provided with flared structures. The flared structures are respectively fitted with the chamfered structures at both ends of the spoke hole (21). The metal sleeve (4) is fixed in the spoke hole (21) by the tapered interference fit between the flared structures at both ends and the chamfered structures at both ends of the spoke hole (21).

2. The anti-electro-erosion connection structure for wheel hub steel wire according to claim 1, characterized in that: The insulating coating (41) is a polytetrafluoroethylene coating, which covers the entire outer surface of the metal sleeve (4) and the entire surface of the isolation flange (421).

3. The hub steel wire anti-electro-erosion connection structure according to claim 2, characterized in that: The thickness of the polytetrafluoroethylene coating is from 0.03 mm to 0.08 mm.

4. The anti-electro-erosion connection structure for wheel hub steel wire according to claim 1, characterized in that: The spoke hole (21) has chamfered structures at both ends. The chamfer on the inner end face of the flange (2) is an inner chamfer (211), and the chamfer on the outer end face of the flange (2) is an outer chamfer (212). The inner chamfer (211) and the outer chamfer (212) are symmetrically arranged on the axial section of the spoke hole (21).

5. The anti-electro-erosion connection structure for wheel hub steel wire according to claim 1, characterized in that: The two ends of the metal sleeve (4) extend radially outward to form an isolation flange (421). The isolation flange (421) fits against the two end faces of the flange (2) to separate the spoke bend (31) of the wire spoke (3) from the flange (2).

6. The anti-electro-erosion connection structure for wheel hub steel wire according to claim 4, characterized in that: The flaring structure includes an inner flaring (42) and an outer flaring (43). The flaring angle of the inner flaring (42) is equal to the conical angle of the inner chamfer (211) of the spoke hole (21), and the flaring angle of the outer flaring (43) is equal to the conical angle of the outer chamfer (212) of the spoke hole (21).

7. The hub steel wire anti-electro-erosion connection structure according to claim 6, characterized in that: The axial depth of the inner end flare (42) is less than or equal to the axial depth of the inner chamfer (211) of the spoke hole (21), and the axial depth of the outer end flare (43) is less than or equal to the axial depth of the outer chamfer (212) of the spoke hole (21).

8. The anti-electro-erosion connection structure for wheel hub steel wire according to claim 1, characterized in that: The middle part of the metal sleeve (4) is a straight cylindrical section (44) of equal diameter. The outer diameter of the straight cylindrical section (44) is smaller than the inner diameter of the middle straight hole section of the spoke hole (21), forming a clearance fit.

9. The hub steel wire anti-electro-erosion connection structure according to claim 2, characterized in that: The spoke bend (31) of the wire spoke (3) is inserted into the inner hole of the metal sleeve (4). The head (32) of the spoke bend (31) abuts against the outer side of the isolation flange (421). The bent part of the spoke bend (31) spans the outer side of the isolation flange (421). The inner arc of the bent part of the spoke bend (31) contacts the outer side of the isolation flange (421).

10. The anti-electro-erosion connection structure for wheel hub steel wire according to claim 2, characterized in that: The isolation flange (421) extends outward along the end face of the flange (2) from the port edge of the spoke hole (21) by a predetermined radial width, the radial width being greater than the outer diameter of the head (32) of the spoke elbow (31).

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