Nut, bolt assembly and vehicle

Abstract

The invention discloses a nut, a bolt assembly and a vehicle, the nut is an aluminum nut, the nut comprises a nut body and an inner hole formed in the nut body, and the hole wall of the inner hole is provided with an internal thread integrally formed through extrusion. According to the nut, the internal threads are integrally extruded and formed, the surface hardness of the internal threads can be improved, and therefore the strength of the internal threads is improved, the internal threads are not prone to damage in the process that the nut is screwed into or screwed out of a bolt, and the risk that the nut and the bolt are seized can be reduced. Besides, the internal threads of the nut are integrally extruded and formed, so that metal scraps can be prevented from being generated at the internal threads, and the problem of seizure between the nut and the bolt caused by the metal scraps in the process that the nut is screwed into or screwed out of the bolt is solved.

Description

Technical Field

[0001] The invention relates to the technical field of fasteners, and in particular to a nut, a bolt assembly and a vehicle. Background Art

[0002] The grounding bolts used on existing aluminum car bodies are grounding bolts, which are designed to be welded to the car body after the nut and bolt are threaded together, and then electrophoresed. After that, the nut is removed and a grounding terminal with a wire is installed between the nut and the bolt to achieve the grounding effect. The above nuts and bolts are made of aluminum alloy. On the one hand, the thread strength of the nut is low, which makes it easy for the thread of the nut to be damaged during the process of screwing the nut in or out of the bolt, and eventually causes the nut and bolt to bite. On the other hand, metal debris is easy to remain on the thread of the nut, which makes it easy for the nut and bolt to bite due to the remaining metal debris during the process of screwing the nut in or out of the bolt. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the present invention provides a nut to reduce the risk of the nut and bolt being stuck.

[0005] The nut of the embodiment of the present invention is an aluminum nut, which includes a nut body and an inner hole arranged in the nut body, and the hole wall of the inner hole is provided with an internal thread formed by integral extrusion.

[0006] In some embodiments, the internal thread includes a plurality of screw threads, the screw threads include a first protrusion and a second protrusion, and the first protrusion and the second protrusion form a notch at the crest of the screw thread.

[0007] In some embodiments, the maximum width of the notch in the extension direction of the inner hole is less than or equal to 0.2 mm.

[0008] In some embodiments, the maximum depth of the notch in the radial direction of the inner hole is less than or equal to 0.3 mm.

[0009] In some embodiments, the internal thread includes a plurality of thread teeth, and the thread angle of the thread teeth is 59° to 61°.

[0010] In some embodiments, the width of the screw thread in the extension direction of the inner hole is 1.24 mm to 1.26 mm; and / or, a thread groove is formed between two adjacent screw threads, and the minimum width of the thread groove in the extension direction of the inner hole is less than or equal to 0.15 mm.

[0011] In some embodiments, the inner hole is a through hole; the nut includes a sealing cover, which is connected to the nut body and seals an opening of one end of the inner hole; an end of the nut body away from the sealing cover is provided with an outer flange.

[0012] The bolt assembly of the embodiment of the present invention comprises a bolt and a nut, wherein the bolt is provided with an external thread; the nut is the nut described in any of the above embodiments of the claim, and the internal thread is threadedly connected with the external thread.

[0013] In some embodiments, the bolt assembly is a grounding bolt, the bolt includes a screw rod and a bolt head connected to each other, the external thread is provided on the screw rod, and the bolt head and the nut are used to clamp the grounding terminal.

[0014] The vehicle according to the embodiment of the present invention comprises the nut described in any one of the above embodiments and / or the bolt assembly described in any one of the above embodiments.

[0015] The internal thread of the nut of the embodiment of the present invention is integrally extruded, which can improve the surface hardness of the internal thread, thereby improving the strength of the internal thread, so that the internal thread is not easily damaged during the process of screwing the nut into or out of the bolt, thereby reducing the risk of the nut and the bolt being stuck. In addition, the internal thread of the nut is integrally extruded, which can also avoid the generation of metal debris at the internal thread, so that when the nut is screwed into or out of the bolt, the nut and the bolt are prevented from being stuck due to metal debris. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of a nut according to an embodiment of the present invention.

[0017] Figure 2 yes Figure 1 Schematic diagram of the structure of the nut body.

[0018] Figure 3 yes Figure 2 Schematic diagram of the structure of the internal thread.

[0019] Figure 4 It is a schematic structural diagram of a bolt assembly according to an embodiment of the present invention.

[0020] Figure 5 It is a schematic diagram of the partial structure of a vehicle according to an embodiment of the present invention.

[0021] Reference numerals:

[0022] 100. Bolt assembly;

[0023] 10. Nut;

[0024] 1. Nut body; 11. Outer flange; 101. Screwing part;

[0025] 2. Inner hole;

[0026] 3. Internal thread; 31. Screw thread; 311. First tooth side; 312. Second tooth side; 313. Tooth peak; 3131. First protrusion; 3132. Second protrusion; 3133. Notch; 314. Tooth valley; 32. Thread groove; 301. Complete screw thread; 302. Incomplete screw thread;

[0027] 4. Sealing cover;

[0028] 20. bolt; 201. bolt head;

[0029] 30. Ground terminal;

[0030] 40. Wire;

[0031] 200. Car body. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0033] like Figures 1 to 3 As shown, the nut 10 of the embodiment of the present invention includes a nut body 1 and an inner hole 2 provided in the nut body 1, and the hole wall of the inner hole 2 is provided with an internal thread 3 formed by integral extrusion. The nut 10 is an aluminum nut. In other words, the material of the nut 10 includes aluminum. For example, the material of the nut 10 is an aluminum alloy.

[0034] The internal thread 3 of the nut 10 of the embodiment of the present invention is integrally extruded, which can improve the surface hardness of the internal thread 3, thereby improving the strength of the internal thread 3, so that the internal thread 3 is not easily damaged during the process of screwing the nut 10 into or out of the bolt, thereby reducing the risk of the nut 10 and the bolt being stuck. In addition, the internal thread 3 of the nut 10 is integrally extruded, which can also avoid the generation of metal debris at the internal thread 3, so that during the process of screwing the nut 10 into or out of the bolt, the nut 10 and the bolt are prevented from being stuck due to metal debris.

[0035] In some embodiments, the internal thread 3 includes a plurality of screw threads 31, wherein the head end of one screw thread 31 of two adjacent screw threads 31 is connected to the tail end of the other screw thread 31, and the plurality of screw threads 31 are spirally arranged on the hole wall of the inner hole 2. The screw thread 31 has a crest 313 and a valley 314. The screw thread 31 includes a first protrusion 3131 and a second protrusion 3132, and the first protrusion 3131 and the second protrusion 3132 form a notch 3133 at the crest 313 of the screw thread 31.

[0036] It should be noted that, due to the limitation of the processing technology, the internal thread 3 includes a complete thread 301 and an incomplete thread 302. The thread 31 in this application refers to the complete thread 301.

[0037] It is understandable that when the internal thread 3 is extruded, the thread 31 is formed by the protrusions formed by extruding the two side parts toward the middle, and a notch 3133 is inevitably formed on the thread 31. By setting the notch 3133 at the crest 313 of the thread 31, it is possible to prevent the notch 3133 from affecting the screwing of the nut 10 into or out of the bolt.

[0038] Alternatively, if Figure 3 As shown, the notch 3133 is in the extension direction of the inner hole 2 ( Figure 3 In other words, the maximum width of the notch 3133 in the extension direction of the inner hole 2 is not greater than 0.2 mm.

[0039] For example, Figure 3 As shown, the maximum width of the notch 3133 in the A direction is L1, and L1 is less than or equal to 0.2 mm.

[0040] It is understandable that when the size of the thread 31 in the extension direction of the inner hole 2 is constant, the greater the maximum width of the notch 3133 in the extension direction of the inner hole 2, the lower the strength of the crest 313 of the thread 31. By setting the maximum width of the notch 3133 in the extension direction of the inner hole 2 to be less than or equal to 0.2 mm, the strength of the crest 313 of the thread 31 can be effectively guaranteed, so that the internal thread 3 is less likely to be damaged during the process of screwing the nut 10 into or out of the bolt, thereby further reducing the risk of the nut 10 and the bolt being stuck.

[0041] Alternatively, if Figure 3 As shown, the notch 3133 is in the radial direction of the inner hole 2 ( Figure 3 The maximum depth of the notch 3133 in the radial direction of the inner hole 2 is less than or equal to 0.3 mm. In other words, the maximum depth of the notch 3133 in the radial direction of the inner hole 2 is not greater than 0.3 mm.

[0042] For example, Figure 3 As shown, the maximum depth of the notch 3133 in the B direction is H, and H is less than or equal to 0.3 mm.

[0043] It is understandable that when the size of the thread 31 in the radial direction of the inner hole 2 is constant, the greater the maximum depth of the notch 3133 in the radial direction of the inner hole 2, the lower the strength of the crest 313 of the thread 31. By setting the maximum depth of the notch 3133 in the diameter of the inner hole 2 to be less than or equal to 0.3 mm, the strength of the crest 313 of the thread 31 can be effectively guaranteed, so that the internal thread 3 is less likely to be damaged during the process of screwing the nut 10 into or out of the bolt, thereby further reducing the risk of the nut 10 and the bolt being stuck.

[0044] In some embodiments, Figure 3 As shown, the thread angle of the thread 31 is 59° to 61°.

[0045] For example, Figure 3 As shown, the screw thread 31 includes a screw thread 31 extending in the direction of the inner hole 2 ( Figure 3 The first tooth side surface 311 and the second tooth side surface 312 are arranged opposite to each other in the A direction in FIG. The angle α between the first tooth side surface 311 and the second tooth side surface 312 is the tooth profile angle of the screw tooth 31, and α is 59° to 61°.

[0046] It is understandable that the larger the tooth profile angle of the screw tooth 31, the larger the width of the screw tooth 31 in the extension direction of the inner hole 2, the greater the strength of the screw tooth 31, and the less likely the internal thread 3 will be damaged during the process of screwing the nut 10 into or out of the bolt, which is more conducive to reducing the risk of the nut 10 and the bolt being stuck. However, the larger the tooth profile angle of the screw tooth 31, the greater the processing difficulty. By setting the tooth profile angle to 59° to 61°, while facilitating the processing of the internal thread 3, the risk of the nut 10 and the bolt being stuck can be effectively reduced. In addition, in the related art, the tooth profile angle of the thread is mostly set to about 60°. By setting the tooth profile angle of the nut 10 to 59° to 61°, the nut 10 can be used in conjunction with most bolts, which is conducive to improving the versatility of the nut 10.

[0047] In some embodiments, Figure 3 As shown, the thread 31 extends in the direction of the inner hole 2 ( Figure 3 The width in the A direction) is 1.24mm~1.26mm.

[0048] For example, Figure 3 The screw thread 31 shown has a crest 313 and a valley 314 , and the spacing L2 between two adjacent valleys 314 is the width of the screw thread 31 in the extension direction of the inner hole 2 , and L2 is 1.24 mm to 1.26 mm.

[0049] It is understandable that the greater the width of the thread 31 in the extension direction of the inner hole 2, the greater the strength of the thread 31, and the less likely the internal thread 3 will be damaged during the process of screwing the nut 10 into or out of the bolt, which is more conducive to reducing the risk of the nut 10 and the bolt being stuck. However, the greater the width of the thread 31 in the extension direction of the inner hole 2, the greater the processing difficulty. By setting the width of the thread 31 in the extension direction of the inner hole 2 to 1.24mm to 1.26mm, while facilitating the processing of the internal thread 3, the risk of the nut 10 and the bolt being stuck can be effectively reduced.

[0050] Optionally, a thread groove 32 is formed between two adjacent thread teeth 31, and the thread groove 32 extends in the extension direction of the inner hole 2 ( Figure 3 The minimum width in the A direction) is less than or equal to 0.15mm.

[0051] For example, Figure 3 As shown, the minimum width of the thread groove 32 in the extension direction of the inner hole 2 is L3, and L3 is less than or equal to 0.15 mm.

[0052] It is understandable that the width of the thread groove 32 in the extension direction of the inner hole 2 is not equal everywhere, and the closer to the center line of the inner hole 2, the smaller the width of the thread groove 32. The minimum width of the thread groove 32 in the extension direction of the inner hole 2 can be understood as: the width of the tooth valley 314 in the extension direction of the inner hole 2. The larger the minimum width of the thread groove 32 in the extension direction of the inner hole 2, the lower the overall strength of the nut 10, and the easier it is for the internal thread 3 to be damaged during the process of screwing the nut 10 in or out of the bolt. By setting the minimum width of the thread groove 32 in the extension direction of the inner hole 2 to less than or equal to 0.15 mm, it is helpful to further reduce the risk of seizure between the nut 10 and the bolt.

[0053] In some embodiments, Figure 1 and Figure 2 As shown, the inner hole 2 is a through hole, and the nut 10 includes a sealing cover 4, which is connected to the nut body 1 and blocks an opening of one end of the inner hole 2. An end of the nut body 1 away from the sealing cover 4 is provided with an outer flange 11.

[0054] When the nut 10 and the bolt are combined to form an assembly and electrophoresis is required on the outer surface of the assembly, a sealing cover 4 is provided to seal one end opening of the inner hole 2, so as to prevent the electrophoresis liquid from entering the threaded fitting part of the nut 10 and the bolt through the end opening of the inner hole 2, causing the nut 10 and the bolt to be stuck, and affecting the conductivity between the nut 10 and the bolt.

[0055] Optionally, the sealing cover 4 is interference fit with the inner hole 2 .

[0056] In other embodiments, the sealing cover 4 and the nut body 1 may also be connected in other ways, for example, the sealing cover 4 and the nut body 1 are bonded.

[0057] Optionally, the sealing cover 4 is a metal cover.

[0058] By setting the sealing cover 4 as a metal cover, it is possible to avoid heat damage to the sealing cover 4 when the temperature of the nut 10 or the bolt that cooperates with the nut 10 is too high, for example, when the nut 10 or the bolt that cooperates with the nut 10 is welded; it is also possible to avoid the sealing cover 4 falling off the nut body 1 when the nut 10 is subjected to electrophoresis, which is beneficial to improving the reliability of the nut 10.

[0059] Alternatively, if Figure 1 and Figure 2 As shown, the nut body 1 comprises a screwing portion 101 for cooperating with a tool.

[0060] For example, Figure 1 and Figure 2 As shown, a portion of the nut body 1 is provided with an external hexagonal structure, and the external hexagonal structure forms a screwing portion 101 .

[0061] The processing method of the nut 10 according to the embodiment of the present invention is as follows:

[0062] (1) A blank with an inner hole 2 is produced by cold heading;

[0063] (2) using a specific tool to extrude the inner hole 2 of the blank so that threads are formed on the hole wall of the inner hole 2, that is, an internal thread 3 is formed on the hole wall of the inner hole 2, thereby obtaining a nut body 1 with the internal thread 3;

[0064] (3) The processed nut body 1 is assembled with the sealing cover 4 to obtain a nut 10 with a completely sealed top.

[0065] Table 1 Comparison of hardness of nuts in the embodiments of the present invention and nuts in the related art:

[0066]

[0067] It can be seen from Table 1 that the surface hardness of the nut 10 in the embodiment of the present invention is higher, so that the strength of the nut 10 in the embodiment of the present invention is better, and the risk of the nut 10 and the bolt being stuck can be effectively reduced.

[0068] like Figure 4 and Figure 5 As shown, the bolt assembly 100 of the embodiment of the present invention includes a bolt 20 and a nut 10, the bolt 20 is provided with an external thread, the nut 10 is the nut 10 described in any of the above embodiments, and the internal thread 3 is threadedly connected with the external thread.

[0069] Since the nut 10 of the embodiment of the present invention can reduce the risk of the seizure problem between the nut 10 and the bolt, the bolt assembly 100 of the embodiment of the present invention can effectively reduce the risk of the seizure problem between the nut 10 and the bolt 20.

[0070] Alternatively, if Figure 4 and Figure 5 As shown, the bolt assembly 100 is a grounding bolt, the bolt 20 includes a screw rod and a bolt head 201 connected to each other, the external thread is provided on the screw rod, and the bolt head 201 and the nut 10 are used to clamp the grounding terminal 30.

[0071] For example, Figure 5 As shown, the grounding terminal 30 is clamped between the bolt head 201 and the nut 10. A wire 40 is electrically connected to the grounding terminal 30. The grounding terminal 30 can be clamped between the bolt head 201 and the outer flange 11.

[0072] The bolt assembly 100 is configured as a grounding bolt, which can effectively reduce the risk of a seizure problem occurring between the nut 10 and the bolt 20 of the grounding bolt.

[0073] Optionally, the material of the bolt 20 includes aluminum, for example, the material of the bolt 20 is aluminum alloy.

[0074] like Figure 5 As shown, the vehicle according to the embodiment of the present invention includes the nut 10 described in any one of the above embodiments and / or the bolt assembly 100 described in any one of the above embodiments.

[0075] For example, Figure 5 As shown, the vehicle includes the bolt assembly 100 described in any of the above embodiments, and the bolt assembly 100 is a grounding bolt. The bolt 20 is welded to the vehicle body 200. When the bolt assembly 100 is specifically connected to the vehicle body 200, the nut 10 and the bolt 20 can be threadedly connected first, and then the bolt 20 can be welded to the vehicle body 200, and then the vehicle body 200 welded with the bolt assembly 100 can be electrophoresed, and finally the nut 10 is removed and the grounding terminal 30 with the wire 40 is clamped between the nut 10 and the bolt 20 to achieve the grounding effect.

[0076] Since the bolt assembly 100 according to the embodiment of the present invention can effectively reduce the risk of the problem of seizure between the nut 10 and the bolt 20, the vehicle according to the embodiment of the present invention has advantages such as good reliability.

[0077] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0078] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0079] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0080] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0081] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0082] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A nut, characterized in that: The nut is an aluminum nut, comprising a nut body and an inner hole arranged in the nut body, and the hole wall of the inner hole is provided with an internal thread formed by integral extrusion.

2. The nut according to claim 1, characterized in that: The internal thread includes a plurality of screw threads, and the screw threads include a first protrusion and a second protrusion, wherein the first protrusion and the second protrusion form a notch at the crest of the screw thread.

3. The nut according to claim 2, characterized in that: The maximum width of the notch in the extension direction of the inner hole is less than or equal to 0.2 mm.

4. The nut according to claim 2, characterized in that: The maximum depth of the notch in the radial direction of the inner hole is less than or equal to 0.3 mm.

5. The nut according to claim 1, characterized in that: The internal thread includes a plurality of thread teeth, and the thread angle of the thread teeth is 59° to 61°.

6. The nut according to claim 5, characterized in that: The width of the screw thread in the extension direction of the inner hole is 1.24 mm to 1.26 mm; and / or A thread groove is formed between two adjacent thread teeth, and the minimum width of the thread groove in the extension direction of the inner hole is less than or equal to 0.15 mm.

7. The nut according to any one of claims 1 to 6, characterized in that: The inner hole is a through hole; The nut includes a sealing cover, which is connected to the nut body and blocks an opening at one end of the inner hole; An end of the nut body away from the sealing cover is provided with an outer flange.

8. A bolt assembly, characterized in that: include: a bolt having an external thread; and A nut, wherein the nut is the nut according to any one of claims 1 to 7, and the internal thread is threadedly connected to the external thread.

9. The bolt assembly according to claim 8, characterized in that: The bolt assembly is a grounding bolt, and the bolt comprises a screw rod and a bolt head which are connected to each other. The external thread is arranged on the screw rod, and the bolt head and the nut are used for clamping the grounding terminal.

10. A vehicle, characterized in that: include: The nut according to any one of claims 1 to 7, and / or The bolt assembly according to claim 8 or 9.

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