Connecting structure

Abstract

The invention relates to a connecting structure. A second fixing member; the connecting piece is inserted into the first fixing piece and the second fixing piece and is used for fixing the first fixing piece and the second fixing piece; the shielding assembly is used for isolating the connecting piece from at least one of the first fixing piece and the second fixing piece, and direct contact is avoided. The connecting structure is suitable for fastening and assembling scenes of various materials, and physical isolation of the connecting piece and the magnesium alloy piece is achieved through the shielding assembly. The shielding assembly is selected according to specific materials and installation positions of the first fixing piece and the second fixing piece and used for isolating the connecting piece from at least one of the first fixing piece and the second fixing piece, and abrasion and galvanic corrosion caused by direct metal contact are avoided. The shielding assembly covers various combination assembly requirements of the magnesium alloy and the non-magnesium alloy, direct friction abrasion of the connecting piece and the magnesium alloy piece is avoided, and a galvanic corrosion loop in contact with dissimilar metal is cut off.

Description

Technical Field

[0001] This application relates to the field of connection mechanism technology, and in particular to a connection structure. Background Technology

[0002] Plastic components in electric bicycles release large amounts of toxic fumes during fires, and toxic fumes account for 80% of electric bicycle fire fatalities. Controlling the proportion of plastic components can significantly reduce fire hazards. Magnesium alloys perfectly meet the lightweight and safety requirements of electric bicycles. The structure of electric bicycles requires a combination of various metals, and direct contact between dissimilar metals is a key cause of magnesium alloy corrosion. If magnesium alloy components are directly connected to metals with higher electrical potentials, such as steel, iron, or aluminum alloys, for example, by fixing magnesium alloy components with ordinary steel bolts, the bolts will cause wear on the magnesium alloy components during assembly and disassembly, resulting in galvanic corrosion. This corrosion occurs much faster than the natural corrosion of magnesium alloys exposed to the environment alone.

[0003] In the existing technology, bolts can cause wear and damage to the oxide layer on magnesium alloy parts during disassembly and assembly. The damaged magnesium alloy parts will corrode when in contact with dissimilar metals. There is a lack of a connection structure to prevent corrosion of magnesium alloy parts. Summary of the Invention

[0004] This application provides a connection structure that can prevent bolts from causing wear to magnesium alloy parts during disassembly and assembly, and prevent magnesium alloy parts from directly contacting dissimilar metal bolts and causing corrosion.

[0005] According to one aspect of this application, a connection structure is provided, comprising:

[0006] First fastener;

[0007] Second fastener;

[0008] A connector is inserted into the first fixing member and the second fixing member to fix the first fixing member and the second fixing member;

[0009] A shielding component is used to isolate the connector from at least one of the first and second fixing members, thereby preventing the connector from directly contacting the first and second fixing members.

[0010] In one embodiment, when the first fastener is configured as a non-magnesium alloy component, the second fastener is configured as a magnesium alloy component, and the positioning portion of the second fastener is configured as a positioning plate, the shielding assembly is configured as a clamping nut, the clamping nut being used to isolate the connector and the second fastener.

[0011] In one embodiment, the positioning plate has a first slot, and the first fixing member has a second slot; the clamping nut includes a clamping part and a nut part, the clamping part has a third slot, the nut part has a first screw hole, and the connector is inserted into the second slot, the first slot, the third slot, and the first screw hole.

[0012] In one embodiment, when the first fastener is configured as a non-magnesium alloy component, the second fastener is configured as a magnesium alloy component, and the positioning portion of the second fastener is configured as a threaded seat, the shielding assembly is configured as a dental sleeve, the dental sleeve being used to isolate the connector and the second fastener.

[0013] In one embodiment, the threaded seat has a slot, and the first fixing member has a second hole slot; the connector is inserted into the second hole slot and the slot.

[0014] In one embodiment, the dental sleeve is disposed on the radial inner wall of the slot, and the connector is threaded into the dental sleeve.

[0015] In one embodiment, when both the first and second fasteners are made of magnesium alloy and the positioning portion of the second fastener is configured as a threaded seat, the shielding assembly is configured as a washer and a threaded sleeve; the threaded sleeve is used to isolate the connector and the second fastener, and the washer is used to isolate the connector and the first fastener.

[0016] In one embodiment, the threaded seat has a slot, and the first fixing member has a second slot; the washer includes a gasket, and the gasket has a fourth slot, and the connector is inserted into the second slot, the fourth slot and the slot.

[0017] In one embodiment, the dental sleeve is disposed on the radial inner wall of the slot, and the connector is threaded into the dental sleeve.

[0018] In one embodiment, when both the first and second fixing members are configured as magnesium alloy parts, and the positioning part of the second fixing member is configured as a positioning plate, the shielding assembly is configured as a washer and a clamping nut; the clamping nut is used to isolate the connecting member and the second fixing member, and the washer is used to isolate the connecting member and the first fixing member.

[0019] In one embodiment, the positioning plate has a first slot, and the first fixing member has a second slot; the washer includes a gasket, and the gasket has a fourth slot; the clamping nut includes a clamping part and a nut part, the clamping part has a third slot, and the nut part has a first screw hole; the connector is inserted into the first slot, the fourth slot, the first slot, the third slot, and the first screw hole.

[0020] In one embodiment, when the first fixing member is configured as a magnesium alloy member, the second fixing member is configured as a non-magnesium alloy member, and the positioning part of the second fixing member is configured as a positioning plate, the shielding assembly is configured as a washer and a clamping nut; the clamping nut is used to fix the connecting member, and the washer is used to isolate the connecting member and the first fixing member.

[0021] In one embodiment, the positioning plate has a first slot, and the first fixing member has a second slot; the clamping nut includes a clamping part and a nut part, the clamping part has a third slot, the nut part has a first screw hole, and the connector is inserted into the second slot, the first slot, the third slot, and the first screw hole.

[0022] In one embodiment, the clamping part is disposed on the positioning plate, and the clamping nut is disposed on the positioning plate through the clamping part; the connector is threadedly connected to the first screw hole.

[0023] In one embodiment, the washer further includes a plurality of claws, all of which are disposed within the second slot, and the washer is disposed within the second slot by the plurality of claws.

[0024] This application has the following beneficial effects:

[0025] The connection structure of this application is suitable for fastening and assembly scenarios involving various materials. The shielding component can prevent direct contact between the connector and the first and second fixing components. When at least one of the first and second fixing components is configured as a magnesium alloy part, the shielding component achieves physical isolation between the connector and the magnesium alloy part. The shielding component is the core protective component, selected according to the specific materials and installation positions of the first and second fixing components. It is used to isolate the connector from at least one of the first and second fixing components, preventing wear and galvanic corrosion caused by direct contact between the connector and the first and second fixing components. The shielding component covers various assembly requirements for magnesium alloy and non-magnesium alloy combinations, and the selection of the shielding component can be flexibly adjusted to avoid direct friction and wear between the connector and the magnesium alloy part, while also cutting off the galvanic corrosion circuit of dissimilar metal contact. Attached Figure Description

[0026] Figure 1The overall three-dimensional structure of an embodiment of this application Figure 1 .

[0027] Figure 2 The overall three-dimensional structure of an embodiment of this application Figure 2 .

[0028] Figure 3 A cross-sectional view of an embodiment of this application. Figure 1 .

[0029] Figure 4 for Figure 3 Enlarged view of the structure at point A in the middle.

[0030] Figure 5 This is the three-dimensional structure of the clip nut in one embodiment of this application. Figure 1 .

[0031] Figure 6 The overall three-dimensional structure of an embodiment of this application Figure 3 .

[0032] Figure 7 A cross-sectional view of an embodiment of this application. Figure 2 .

[0033] Figure 8 This is a three-dimensional structural view of the second fastener in one embodiment of this application.

[0034] Figure 9 The overall three-dimensional structure of an embodiment of this application Figure 4 .

[0035] Figure 10 A cross-sectional view of an embodiment of this application. Figure 3 .

[0036] Figure 11 The overall three-dimensional structure of an embodiment of this application Figure 5 .

[0037] Figure 12 A cross-sectional view of an embodiment of this application. Figure 4 .

[0038] Figure 13 for Figure 12 Enlarged view of the structure at point B.

[0039] Figure 14 The overall three-dimensional structure of the gasket in one embodiment of this application Figure 1 .

[0040] Figure 15 The overall three-dimensional structure of the gasket in one embodiment of this application Figure 2 .

[0041] Figure 16The overall three-dimensional structure of an embodiment of this application Figure 6 .

[0042] Figure 17 A cross-sectional view of an embodiment of this application. Figure 5 .

[0043] Figure 18 for Figure 17 Enlarged view of the structure at point C.

[0044] Figure 19 The overall three-dimensional structure of an embodiment of this application Figure 7 .

[0045] Figure 20 A cross-sectional view of an embodiment of this application. Figure 6 .

[0046] Figure 21 for Figure 20 Enlarged view of the structure at point D.

[0047] Explanation of reference numerals in the attached figures:

[0048] 100. First fastener;

[0049] 110. Second slot;

[0050] 200. Second fastener;

[0051] 210. Threaded seat; 211. Slotted;

[0052] 220. Positioning plate; 221. First slot;

[0053] 300. Connectors;

[0054] 400. Obstruction components;

[0055] 410. Braces;

[0056] 420. Clamping nut; 421. Clamping part; 422. Nut part; 423. Third slot; 424. First screw hole;

[0057] 430. Washer; 431. Gasket; 432. Fourth slot; 433. Claw. Detailed Implementation

[0058] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are 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 application. However, this application 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 application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0059] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0060] Furthermore, where the terms "first" and "second" appear, these terms are 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 with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0061] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0062] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0063] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0064] See appendix Figure 1 -Appendix Figure 2 , attached Figure 1 -Appendix Figure 2 A three-dimensional structural schematic diagram of a connection structure according to an embodiment of this application is shown, including a first fastener 100;

[0065] Second fastener 200;

[0066] The connector 300 is inserted into the first fixing member 100 and the second fixing member 200 and is used to fix the first fixing member 100 and the second fixing member 200.

[0067] The shielding assembly 400 is used to isolate the connector 300 from at least one of the first fastener 100 and the second fastener 200 to prevent direct contact.

[0068] The connection structure of this application is suitable for fastening and assembling magnesium alloy parts with non-magnesium alloy parts and dual magnesium alloy parts. It solves the problem of dissimilar metal contact corrosion caused by the low hardness of magnesium alloy parts. The shielding component 400 achieves physical isolation between the connector 300 and the magnesium alloy part. The second fixing part 200 can be configured as a magnesium alloy part or a non-magnesium alloy part, and its positioning part can be either a threaded seat 210 or a positioning plate 220. The threaded seat 210 has a slot 211, and the positioning plate 220 has a first hole slot 221, both used to support the shielding component 400. The connector 300 uses stainless steel bolts, which pass through the first fixing part 100, the shielding component 400, and the second fixing part 200 in sequence to achieve a fastening connection between the two fixing parts.

[0069] The shielding component 400 is the core protective component. Based on the material of the first fixing member 100 and the structure of the positioning part, one or more combinations of the toothed sleeve 410, the clamp nut 420, and the washer 430 with claw 433 are selected to isolate the connector 300 from at least one of the first fixing member 100 and the second fixing member 200, so as to avoid wear and galvanic corrosion caused by direct metal contact.

[0070] The shielding assembly 400 covers various assembly requirements for magnesium alloys and non-magnesium alloys, and the selection of the shielding assembly 400 can be flexibly adjusted. It avoids direct friction and wear between the connector 300 and the magnesium alloy parts, and also cuts off the galvanic corrosion circuit of dissimilar metal contact.

[0071] See appendix Figure 2 -Appendix Figure 4 When the first fixing member 100 is configured as a non-magnesium alloy part, the second fixing member 200 is configured as a magnesium alloy part, and the positioning part of the second fixing member 200 is configured as a positioning plate 220, the shielding assembly 400 is configured as a clamping nut 420, which is used to isolate the connecting member 300 and the second fixing member 200.

[0072] In some embodiments, when the first fastener 100 is a non-magnesium alloy part such as carbon steel, aluminum alloy frame or plastic part, the second fastener 200 is a magnesium alloy part with a positioning plate 220, and the shielding assembly 400 is a clip nut 420, the design logic is to use the double-layer metal structure of the clip nut 420 + insulation protection to achieve isolation between the connector 300, that is, the bolt and the magnesium alloy positioning plate 220, taking into account wear resistance, corrosion resistance and assembly stability.

[0073] The carbon steel and aluminum alloy frames are coated with a coating. Although they are in direct contact with the second fastener 200, they will not damage the surface of the second fastener 200 like the connecting part 300, i.e., the bolt.

[0074] In some embodiments, the connector 300 is a stainless steel bolt that passes through the first fixing member 100 and the positioning plate 220, and engages with the clip nut 420 to achieve fastening.

[0075] In some embodiments, the clip nut 420 is a shielding component 400, which adopts an integrated structure of carbon steel galvanized clip and stainless steel nut. It can physically isolate the bolt from the magnesium alloy positioning plate 220, and is used to withstand the friction force of disassembly and assembly to prevent wear of the magnesium alloy.

[0076] In some embodiments, the bolt holes of the positioning plate 220, i.e., the first slot 221, need to be enlarged, with the hole diameter slightly larger than the outer diameter of the clamp nut 420 and a gap of 0.1mm-0.2mm, to ensure that the clamp nut 420 can be embedded in the hole without scratching the magnesium alloy surface. The second fastener 200 is passivated and electrophoretically treated as a whole, with an electrophoretic coating thickness of 60μm-80μm, covering the surface of the positioning plate 220 and the inner wall of the first slot 221 to form a basic anti-corrosion barrier.

[0077] In some embodiments, the clip nut 420 has a built-in U-shaped clip and welded nut structure, and the clip can be elastically snapped into the positioning plate 220. The nut part 422 is made of stainless steel, which has high hardness and wear resistance, and can withstand the frictional force of repeated bolt disassembly and assembly.

[0078] In some embodiments, the frictional force of the connector 300, i.e. the bolt during disassembly and assembly, is entirely borne by the stainless steel thread of the clamp nut 420. The inner wall of the through hole of the magnesium alloy positioning plate 220 only contacts the elastic coating of the clamp, without thread engagement friction, thus avoiding wear and deformation problems caused by the low hardness of the magnesium alloy.

[0079] See appendix Figure 2 -Appendix Figure 5 The positioning plate 220 has a first slot 221, and the first fixing member 100 has a second slot 110. The clamping nut 420 includes a clamping part 421 and a nut part 422. The clamping part 421 has a third slot 423, and the nut part 422 has a first screw hole 424. The connecting member 300 is inserted into the second slot 110, the first slot 221, the third slot 423 and the first screw hole 424.

[0080] In some embodiments, the clamping part 421 of the clamping nut 420 is first clamped onto the positioning plate 220. With the elasticity of the clamping part 421 itself, the end face of the clamping part 421 is fully fitted with the contact surface of the positioning plate 220 without loosening or shaking. The coaxiality deviation between the third slot 423, the first screw hole 424 and the first slot 221 is ≤0.1mm, so as to avoid jamming when the connector 300 is inserted.

[0081] On the one hand, the clamping part 421 and the positioning plate 220 are physically isolated by an electrophoretic layer, preventing direct metal-to-metal contact. On the other hand, the stainless steel material of the nut part 422 contacts the connector 300, bearing the thread friction force during bolt assembly and disassembly, completely avoiding the magnesium alloy from directly bearing the friction load.

[0082] In some embodiments, the positioning plate 220 of the second fastener 200 is fitted against the mounting surface of the first fastener 100 to ensure that the second slot 110, the first slot 221, the third slot 423, and the first screw hole 424 are coaxial, with the deviation controlled within 0.1 mm, to prevent subsequent bolts from forcibly inserting and damaging the components. The connector 300 is passed through the second slot 110 from the outside of the first fastener 100, then through the first slot 221 and the third slot 423 in sequence, and finally aligned with the first screw hole 424 of the nut portion 422, and tightened using an external tool.

[0083] See appendix Figure 6 -Appendix Figure 10 When the first fastener 100 is configured as a non-magnesium alloy part, the second fastener 200 is configured as a magnesium alloy part, and the positioning part of the second fastener 200 is configured as a threaded seat 210, the shielding assembly 400 is configured as a toothed sleeve 410, which is used to isolate the connector 300 and the second fastener 200.

[0084] In some embodiments, this solution addresses scenarios where the first fastener 100 is a non-magnesium alloy and the second fastener 200 is a magnesium alloy component with a threaded seat 210. The brace 410 is used as the core shielding component 400 to achieve isolation between the connector 300 and the magnesium alloy.

[0085] In some embodiments, the threaded seat 210 is an auxiliary structure on the second fastener 200, serving as the core connection part of the magnesium alloy component. It has a pre-set threaded hole inside, i.e., a slot 211. The specifications of the slot 211 match the dental brace 410. The inner wall of the slot 211 needs to be finely polished to remove die-casting burrs and oxide scale, ensuring that the dental brace 410 fits tightly after being inserted without gaps or shaking.

[0086] In some embodiments, the dental sleeve 410 is made of stainless steel or phosphor bronze and has a wire thread sleeve structure. The thread pitch is perfectly matched with that of the connector 300, and the outer diameter is slightly larger than the inner diameter of the slot 211 on the threaded seat 210 to achieve an interference fit. It has high hardness, wear resistance, and corrosion resistance. Its function is to be embedded in the slot 211, serving as the engagement carrier of the connector 300, isolating the connector 300 from the magnesium alloy, and bearing the friction force during disassembly and assembly.

[0087] In some embodiments, the installation of the dental insert 410 requires the use of a special tool to avoid damaging the magnesium alloy threaded seat 210 and the electrophoretic coating. Using a special installation wrench for the dental insert 410, align the dental insert 410 with the slot 211 on the threaded seat 210 and slowly rotate it into place. During insertion, avoid forceful impact to prevent cracking of the electrophoretic coating at the edge of the threaded seat 210 or damage to the magnesium alloy substrate. After the dental insert 410 is installed, ensure that its end face is flush with the port of the threaded seat 210 and that the dental insert 410 fits tightly against the inner wall of the slot 211 without warping or loosening.

[0088] In some embodiments, the dental brace 410 serves as a dual protective carrier. On one hand, its high-hardness material withstands the thread friction during the assembly and disassembly of the connector 300, preventing wear and deformation of the magnesium alloy due to insufficient hardness. On the other hand, it physically isolates the connector 300 from the magnesium alloy substrate, cutting off the galvanic corrosion circuit and mitigating corrosion risks at the source.

[0089] See appendix Figure 7 -Appendix Figure 10 The threaded seat 210 has a slot 211, and the first fixing member 100 has a second hole 110; the connector 300 is inserted into the second hole 110 and the slot 211.

[0090] In some embodiments, the insertion and tightening of the connector 300 must ensure no additional friction and uniform force distribution. The second slot 110 and the slot 211 are coaxially aligned. When the connector 300 passes through the second slot 110, the rod portion does not contact the hole wall, with a gap of 0.1mm-0.2mm, to avoid frictional scratches. During tightening, the torque is controlled using a torque wrench, and over-tightening is prohibited to prevent deformation of the threaded sleeve 410, stripping of the threads, or cracking of the magnesium alloy threaded seat 210.

[0091] In some embodiments, the first fastener 100 is machined with a second slot 110 and subjected to surface rust prevention treatment, the second fastener 200 is die-cast and polished, and the threaded seat 210 is slotted 211 and subjected to cleaning, passivation, and electrophoresis treatment. The dental brace 410 is slowly inserted into the slot 211 using a special tool to ensure a tight fit and flush end faces, and the scratched areas of the coating are locally repaired.

[0092] Pass the connector 300 through the second slot 110 from the outside of the first fixing part 100, align it with the thread of the toothed sleeve 410 and manually pre-tighten it 2-3 turns, then tighten it with a torque wrench to the specified torque. After tightening, check that the parts are not deformed and the toothed sleeve 410 is not loose.

[0093] See appendix Figure 8 and attached Figure 10 The dental sleeve 410 is set on the radial inner wall of the slot 211, and the connector 300 is threaded into the dental sleeve 410.

[0094] In some embodiments, the radial inner wall of the slot 211 is finely ground to remove burrs, oxide scale, and machining marks remaining from die casting, ensuring a smooth inner wall. Subsequently, high-pressure air blowing and ultrasonic cleaning are used to remove metal debris and oil stains from the hole, preventing impurities from affecting the fit of the dental brace 410.

[0095] In some embodiments, after radial press-fitting, the threaded sleeve 410 fits tightly against the inner wall of the slot 211 without relative sliding. The thread engagement friction and tightening force during the assembly and disassembly of the connector 300 are entirely borne by the high-hardness threaded sleeve 410, while the radial inner wall of the slot 211 only bears the static pressure during press-fitting, without frictional damage. The inner thread strength of the threaded sleeve 410 is far higher than that of magnesium alloy, allowing it to repeatedly withstand bolt assembly and disassembly loads, avoiding thread wear and stripping problems caused by insufficient hardness in magnesium alloy.

[0096] In some embodiments, the dental brace 410 radially fills the inner wall of the slot 211, ensuring that the dissimilar metal connector 300 is completely out of contact with the magnesium alloy substrate, thus cutting off the formation circuit of galvanic corrosion. The electrophoretic coating on the inner wall of the slot 211 further isolates the dental brace 410 from the metal contact with the magnesium alloy, so that even if minor corrosion occurs on the surface of the dental brace 410, it will not spread to the magnesium alloy substrate.

[0097] If braces 410 show wear, they can be removed and replaced with new ones using special tools, without the need to scrap the magnesium alloy parts.

[0098] See appendix Figure 11 -Appendix Figure 15 When both the first fixing member 100 and the second fixing member 200 are made of magnesium alloy, and the positioning part of the second fixing member 200 is configured as a threaded seat 210, the shielding assembly 400 is configured as a washer 430 and a toothed sleeve 410; the toothed sleeve 410 is used to isolate the connector 300 and the second fixing member 200, and the washer 430 is used to isolate the connector 300 and the first fixing member 100.

[0099] In some embodiments, for scenarios where both the first fastener 100 and the second fastener 200 are magnesium alloy parts, and the positioning part of the second fastener 200 is a threaded seat 210, a combined shielding assembly 400 consisting of a toothed sleeve 410 and a washer 430 is used to isolate the connector 300 from the two magnesium alloy parts, thereby solving the wear and galvanic corrosion problems during the connection of the two magnesium alloy parts, while ensuring connection strength and lightweight requirements.

[0100] In some embodiments, the washer 430 is an insulating washer 430, with an inner diameter 2mm-3mm smaller than the diameter of the second hole 110 on the first fixing member 100, and an inner diameter that is clearance-fitted with the rod portion of the connector 300, and a thickness of 0.5mm-1mm. The washer 430 is made of polytetrafluoroethylene (PTFE) or modified nylon, and has high insulation, wear resistance, and weather resistance. It is placed between the head of the connector 300 and the first fixing member 100, preventing the end faces of the connector 300 from contacting the first fixing member 100.

[0101] In some embodiments, the high-hardness dental sleeve 410 bears the thread engagement friction force during the assembly and disassembly of the connector 300, while the inner wall of the magnesium alloy slot 211 only bears the static pressure of the press fitting, without friction damage, thus preventing thread deformation and stripping due to the low hardness of the magnesium alloy. The insulating washer 430 isolates the head of the connector 300 from contact with the end face of the magnesium alloy, preventing the end face friction from scratching the electrophoretic coating during tightening and disassembly.

[0102] In some embodiments, the specifications of the threaded sleeve 410 must precisely match the diameter of the slot 211 and the thread of the connector 300. Excessive interference can easily lead to cracking of the threaded hole, while insufficient interference can cause the threaded sleeve 410 to loosen. The insulating washer 430 must completely cover the area surrounding the second slot 110 of the first fastener 100 to prevent localized contact between the head of the connector 300 and the magnesium alloy end face. The tightening torque must be strictly controlled to prevent micro-cracks from forming in the magnesium alloy parts due to stress concentration, which could affect structural strength and corrosion resistance.

[0103] See appendix Figure 12 -Appendix Figure 13The threaded seat 210 has a slot 211, and the first fixing member 100 has a second hole slot 110; the washer 430 includes a washer 431, and the washer 431 has a fourth hole slot 432, and the connector 300 is inserted into the second hole slot 110, the fourth hole slot 432 and the slot 211.

[0104] In some embodiments, the second slot 110 of the first fastener 100, the fourth slot 432 of the washer 430, and the slot 211 on the second fastener 200 are coaxially aligned with a coaxiality deviation of ≤0.1mm to prevent the connector 300 from being forcibly inserted, which could cause deformation of the dental sleeve 410 or cracking of the magnesium alloy parts. The connector 300 is passed through the second slot 110 and the fourth slot 432 in sequence, and manually pre-tightened for 2-3 turns to confirm that there is no misalignment of the threads. Then, a torque wrench is used to control the torque according to the specifications, and over-tightening is prohibited to avoid stress concentration in the magnesium alloy parts, which could cause microcracks.

[0105] In some embodiments, the insulating washer 430 isolates the head of the connector 300 from contact with the magnesium alloy end face, eliminating end-face friction during tightening and disassembly, and protecting the electrophoretic coating on the surface of the first fastener 100 from scratches. This specifically addresses the contact corrosion problem between the dual magnesium alloy components and the metal connector 300, adapting to connection scenarios for dual magnesium alloy components in electric bicycles.

[0106] In some embodiments, the combined weight of the dental brace 410 and the washer 430 is less than 10g, which does not increase the additional burden on the vehicle and meets the new national standard for lightweighting. Maintenance costs are low; the dental brace 410 or washer 430 can be replaced individually after wear, eliminating the need to scrap the magnesium alloy substrate.

[0107] See appendix Figure 16 -Appendix Figure 18 When both the first fixing member 100 and the second fixing member 200 are made of magnesium alloy, and the positioning part of the second fixing member 200 is configured as a positioning plate 220, the shielding assembly 400 is configured as a washer 430 and a clamping nut 420; the clamping nut 420 is used to isolate the connecting member 300 and the second fixing member 200, and the washer 430 is used to isolate the connecting member 300 and the first fixing member 100.

[0108] In some embodiments, for applications where both the first fixing member 100 and the second fixing member 200 are magnesium alloy parts, and the positioning part of the second fixing member 200 is a positioning plate 220, a combined shielding assembly 400 consisting of a clamping nut 420 and a washer 430 is used to physically isolate the connector 300 from the two magnesium alloy parts, thereby solving the problems of disassembly and assembly wear and dissimilar metal galvanic corrosion during the connection of the two magnesium alloy parts, while also taking into account the connection strength and the lightweight requirements of electric bicycles.

[0109] In some embodiments, the nut portion 422 of the clamp nut 420 bears the thread engagement friction of the connector 300. The high-hardness stainless steel material can withstand repeated disassembly and assembly, preventing wear of the magnesium alloy positioning plate 220 due to insufficient hardness. The elastic snap-fit ​​structure of the clamping portion 421 and the epoxy insulating adhesive together block the metal contact path between the connector 300 and the second fixing member 200, cutting off the galvanic corrosion circuit.

[0110] In some embodiments, the end face of the washer 430 is isolated during assembly. The washer 430 is used to prevent contact between the head of the connector 300 and the magnesium alloy end face of the first fixing member 100. The protective effect needs to be ensured through size matching and anti-slip design. The fourth groove 432 of the washer 430 is coaxially aligned with the second groove 110 of the first fixing member 100 and fitted onto the rod of the connector 300, ensuring that the washer 431 completely covers the magnesium alloy end face around the second groove 110, with no exposed areas.

[0111] In some embodiments, the thread engagement friction force during the assembly and disassembly of the connector 300 is entirely borne by the stainless steel nut portion 422 of the clamping nut 420, while the magnesium alloy positioning plate 220 only bears the elastic clamping force of the clamping portion 421, without frictional damage, thus preventing deformation of the positioning plate 220's slots or damage to the coating. The insulating washer 430 isolates the head of the connector 300 from direct contact with the magnesium alloy end face, eliminating end face friction during tightening and disassembly, and protecting the electrophoretic coating on the surface of the first fixing member 100 from scratches.

[0112] In some embodiments, the specifications of the clamping nut 420 must precisely match the first slot 221 on the positioning plate 220 and the thread of the connector 300 to avoid loosening due to insufficient elasticity of the clamping part 421 or excessive thread clearance affecting connection stability. The fourth slot 432 of the washer 430 must be coaxial with the second slot 110 to prevent the rod of the connector 300 from rubbing against the hole wall and damaging the insulation performance of the washer 430.

[0113] See appendix Figure 17 -Appendix Figure 18 The positioning plate 220 has a first slot 221, and the first fixing member 100 has a second slot 110; the washer 430 includes a washer 431, and the washer 431 has a fourth slot 432; the clamping nut 420 includes a clamping part 421 and a nut part 422, the clamping part 421 has a third slot 423, and the nut part 422 has a first screw hole 424; the connecting member 300 is inserted into the first slot 221, the fourth slot 432, the first slot 221, the third slot 423, and the first screw hole 424.

[0114] In some embodiments, the connector 300 must pass sequentially through the second slot 110, the fourth slot 432, the first slot 221, the third slot 423, and the first threaded hole 424, ensuring that the coaxiality deviation of all slots and threaded holes is ≤0.1mm, to prevent forced insertion from causing deformation of the clamp nut 420 or cracking of the magnesium alloy parts. Screw the connector 300 into the first threaded hole 424, pre-tightening it 2-3 turns to confirm there is no thread misalignment. Tighten it according to specifications using a torque wrench, avoiding over-tightening to prevent micro-cracks from forming in the magnesium alloy positioning plate 220 or the first fixing member 100 due to stress concentration.

[0115] See appendix Figure 18 -Appendix Figure 21 When the first fixing member 100 is configured as a magnesium alloy part, the second fixing member 200 is configured as a non-magnesium alloy part, and the positioning part of the second fixing member 200 is configured as a positioning plate 220, the shielding assembly 400 is configured as a washer 430 and a clamping nut 420; the clamping nut 420 is used to fix the connecting member 300, and the washer 430 is used to isolate the connecting member 300 and the first fixing member 100.

[0116] In some embodiments, for applications where the first fixing member 100 is a magnesium alloy part, the second fixing member 200 is a non-magnesium alloy part, and the positioning part of the second fixing member 200 is a positioning plate 220, a combined shielding assembly 400 of washer 430 and clamp nut 420 is adopted. The washer 430 isolates the magnesium alloy part from the connector 300, and the clamp nut 420 enhances the connection stability and solves the wear and corrosion problems of the magnesium alloy part.

[0117] In some embodiments, the function of the clip nut 420 is to bear the thread tightening force of the connector 300, preventing the connector 300 from directly acting on the magnesium alloy part to be protected. Assembly requires the use of its elastic structure to achieve precise positioning. The stainless steel nut portion 422 of the clip nut 420 directly bears the thread engagement friction force during the assembly and disassembly of the connector 300. The non-magnesium alloy provides sufficient load-bearing strength, eliminating concerns about wear and corrosion. The elastic clamping portion 421 ensures that the clip nut 420 does not loosen under cycling vibration conditions, guaranteeing connection stability.

[0118] See appendix Figure 17 -Appendix Figure 21 The clamping part 421 is set on the positioning plate 220, and the clamping nut 420 is set on the positioning plate 220 through the clamping part 421; the connecting piece 300 is threadedly connected in the first screw hole 424.

[0119] In some embodiments, the clamping portion 421 of the clip nut 420 is a galvanized elastic spring steel structure, its shape precisely matching the large-diameter section of the first slot 221, and a third slot 423 is provided, the diameter of which is slightly smaller than the inner diameter of the first threaded hole 424. The nut portion 422 is made of 304 stainless steel and has a first threaded hole 424 inside, the thread specification of which is completely matched with the connector 300. The clamping portion 421 is galvanized for corrosion protection, ensuring elastic clamping performance. The nut portion 422 is passivated to resist repeated disassembly and assembly wear. The clamping portion 421 is fixed to the positioning plate 220, and the nut portion 422 bears the thread engagement force of the connector 300, preventing the connector 300 from directly acting on the magnesium alloy part.

[0120] In some embodiments, the high-hardness stainless steel nut portion 422 bears the thread engagement friction of the connector 300, and the clamping portion 421 is engaged with the positioning plate 220 without relative sliding, thus eliminating the risk of wear.

[0121] See appendix Figure 17 -Appendix Figure 21 The washer 430 also includes multiple claws 433, all of which are disposed within the second slot 110. The washer 430 is disposed within the second slot 110 by means of the multiple claws 433.

[0122] In some embodiments, a claw 433 is added to the washer 430 and embedded in the second groove 110 to further enhance the installation stability and isolation protection effect of the washer 430, and accurately solve the wear and galvanic corrosion problems of magnesium alloy parts.

[0123] In some embodiments, the claws 433 consist of 3-4 elastic protrusions evenly distributed along the circumference of the inner wall of the fourth groove 432, with a height equal to or greater than the depth of the second groove 110, and guide angles on the outer sides. The claws 433 and the gasket 431 are made of the same material, namely polytetrafluoroethylene (PTFE) or modified nylon. The claws 433 are embedded in the second groove 110 to achieve anti-loosening positioning of the gasket 430, and the gasket 431 is used to isolate the head of the connector 300 from the magnesium alloy part, further blocking the galvanic corrosion circuit.

[0124] In some embodiments, during installation, the claws 433 of the washer 430 are aligned with the second groove 110. Using the guide angle on the outer side of the claws 433, the washer 431 is gently pressed, causing the claws 433 to elastically contract and slide into the second groove 110. After the claws 433 are fully embedded, they use their own elasticity to fit tightly against the hole wall, achieving a secure and stable positioning of the washer 430.

[0125] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively 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 application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A connection structure characterized by comprising: The utility model relates to a fixing device, including: First fixed part (100); Second fixed part (200); Connecting piece (300) is inserted in first fixed part (100) and second fixed part (200), is used for the fixed first fixed part (100) and second fixed part (200) with fixed part (200) between at least one of connecting piece (300) with first fixed part (100) and second fixed part (200) is isolated, avoids connecting piece (300) with first fixed part (100), second fixed part (200) direct contact. The first fixed part (100) is configured as a non-magnesium alloy part; 2. The connection structure according to claim 1, characterized in that The second fixed part (200) is configured as a magnesium alloy part; The positioning part of the second fixed part (200) is configured as a positioning plate (220); The shielding assembly (400) is configured as a clamp nut (420), and the clamp nut (420) is used to isolate the connecting piece (300) and the second fixed part (200). The positioning plate (220) is provided with a first hole groove (221), and the first fixed part (100) is provided with a second hole groove (110); the clamp nut (420) includes a clamping part (421) and a nut part (422), the clamping part (421) is provided with a third hole groove (423), and the nut part (422) is provided with a first screw hole (424); 3. The connection structure according to claim 2, characterized in that The connecting piece (300) is inserted into the second hole groove (110), the first hole groove (221), the third hole groove (423) and the first screw hole (424). The first fixed part (100) is configured as a non-magnesium alloy part; 4. The connection structure according to claim 1, characterized by The second fixed part (200) is configured as a magnesium alloy part; The positioning part of the second fixed part (200) is configured as a threaded seat (210); The shielding assembly (400) is configured as a mouthpiece (410), and the mouthpiece (410) is used to isolate the connecting piece (300) and the second fixed part (200). The threaded seat (210) is provided with a slot (211), and the first fixed part (100) is provided with a second hole groove (110); 5. The connection structure according to claim 4, characterized in that The connecting piece (300) is inserted into the second hole groove (110) and the slot (211). The first fixed part (100) and the second fixed part (200) are both configured as magnesium alloy parts; 6. The connection structure according to claim 1, wherein The positioning part of the second fixed part (200) is configured as a threaded seat (210); The shielding assembly (400) is configured as a washer (430) and a mouthpiece (410); the mouthpiece (410) is used to isolate the connecting piece (300) and the second fixed part (200), and the washer (430) is used to isolate the connecting piece (300) and the first fixed part (100). The threaded seat (210) is provided with a slot (211), and the first fixed part (100) is provided with a second hole groove (110); the washer (430) includes a gasket (431), and the gasket (431) is provided with a fourth hole groove (432); 7. The connection structure according to claim 6, characterized in that ​ The connecting piece (300) is inserted into the second hole slot (110), the fourth hole slot (432) and the slot (211).

8. The connection structure according to claim 5 or 7, characterized by The mouthpiece (410) is arranged on the radial inner wall of the slot (211); And / or, the connecting piece (300) is threadedly connected in the mouthpiece (410).

9. The connection structure according to claim 1, wherein The first fixing piece (100) and the second fixing piece (200) are configured as magnesium alloy pieces; The positioning part of the second fixing piece (200) is configured as a positioning plate (220); The shielding assembly (400) is configured as a gasket (430) and a clamping nut (420); the clamping nut (420) is used for isolating the connecting piece (300) and the second fixing piece (200), and the gasket (430) is used for isolating the connecting piece (300) and the first fixing piece (100).

10. The connection structure according to claim 9, wherein The first hole slot (221) is arranged on the positioning plate (220), and the second hole slot (110) is arranged on the first fixing piece (100); the gasket (430) comprises a gasket piece (431), and the fourth hole slot (432) is arranged on the gasket piece (431); the clamping nut (420) comprises a clamping part (421) and a nut part (422), the third hole slot (423) is arranged on the clamping part (421), and the first screw hole (424) is arranged on the nut part (422); The connecting piece (300) is inserted into the first hole slot (221), the fourth hole slot (432), the first hole slot (221), the third hole slot (423) and the first screw hole (424).

11. The connection structure according to claim 1, characterized by The first fixing piece (100) is configured as a magnesium alloy piece; The second fixing piece (200) is configured as a non-magnesium alloy piece; The positioning part of the second fixing piece (200) is configured as a positioning plate (220); The shielding assembly (400) is configured as a gasket (430) and a clamping nut (420); the clamping nut (420) is used for isolating the connecting piece (300) and the second fixing piece (200), and the gasket (430) is used for isolating the connecting piece (300) and the first fixing piece (100).

12. The connection structure according to claim 11, wherein The first hole slot (221) is arranged on the positioning plate (220), and the second hole slot (110) is arranged on the first fixing piece (100); the gasket (430) comprises a gasket piece (431), and the fourth hole slot (432) is arranged on the gasket piece (431); the clamping nut (420) comprises a clamping part (421) and a nut part (422), the third hole slot (423) is arranged on the clamping part (421), and the first screw hole (424) is arranged on the nut part (422); The connecting piece (300) is inserted into the first hole slot (221), the fourth hole slot (432), the first hole slot (221), the third hole slot (423) and the first screw hole (424).

13. The connection structure according to claim 3 or 10 or 12, characterized by The clamping part (421) is arranged on the positioning plate (220), and the clamping nut (420) is arranged on the positioning plate (220) through the clamping part (421); And / or, the connecting piece (300) is threadedly connected in the first screw hole (424).

14. The connection structure according to claim 7 or 10 or 12, characterized by The gasket (430) further comprises a plurality of claws (433), each of the plurality of claws (433) is arranged in the second hole slot (110), and the gasket (430) is arranged in the second hole slot (110) through the plurality of claws (433).

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