Bolt connecting structure, vehicle body frame and vehicle

Abstract

The embodiment of the utility model relates to the technical field of vehicle manufacturing, and discloses a bolt connecting structure, a vehicle body frame and a vehicle, the bolt connecting structure comprises a first vehicle body part, a second vehicle body part, a welding nut, a welding foot layer and a bolt body; the first vehicle body part is provided with a first through hole; the second vehicle body part is provided with a second through hole; the bolt body is used for penetrating through the second through hole and the first through hole and is in threaded connection with the welding nut, so that the second vehicle body part and the first vehicle body part are locked and fixed; the weld leg layer is in a closed ring shape; the end face of one side of the weld leg layer is fixed to the welding nut, and the end face of the other side of the weld leg layer is welded and fixed to the first vehicle body part. The weld leg layer is arranged around the bolt body. According to the bolt connecting structure provided by the invention, the welding nut can be welded and fixed on the vehicle body part, and a gap between the vehicle body part and the welding nut is eliminated, so that the problem of liquid and gas leakage between the first vehicle body part and the welding nut after bolt connection is avoided.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of vehicle manufacturing technology, and in particular to a bolt connection structure, a vehicle body frame and a vehicle. Background Art

[0002] There are many ways to connect the body and the vehicle body. Bolt connection is one of the connection methods. It is very common to use bolt connection on the vehicle body. For example, when the welding gun cannot reach the position or the assembly workshop needs to assemble it due to installation layout requirements, bolt connection is required to fix it. In theory, bolt connection will have the risk of water leakage and air leakage. According to the factory quality requirements of the whole vehicle, this phenomenon is strictly prohibited.

[0003] Therefore, a new type of bolt connection structure is urgently needed to solve the water leakage and air leakage problems existing in the existing bolt connections. Utility Model Content

[0004] In view of this, the embodiments of the present application provide a bolt connection structure, a vehicle body frame and a vehicle, which can allow the welding nut to be welded and fixed on the body part, eliminating the gap between the body part and the welding nut, thereby avoiding the problem of liquid leakage and gas leakage between the first body part and the welding nut after bolt connection.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the embodiment of the present application is implemented as follows:

[0006] In the first aspect, an embodiment of the present application provides a bolt connection structure, including a first body part, a second body part, a welding nut, a weld foot layer, and a bolt body; the first body part is provided with a first through hole; the second body part is provided with a second through hole; the bolt body is used to pass through the second through hole and the first through hole and be threadedly connected with the welding nut to lock and fix the second body part to the first body part; the weld foot layer is in a closed ring shape; one end face of the weld foot layer is fixed on the welding nut, and the other end face of the weld foot layer is welded and fixed to the first body part; the weld foot layer is arranged around the bolt body.

[0007] The bolt connection structure provided in the embodiment of the present application can allow the welding nut to be welded to the first body part through the closed ring-shaped welding foot layer, and then allow the bolt body to pass through the first through hole and the second through hole and be screwed with the welding nut to achieve the connection effect of the first body part and the second body part. In addition, the closed ring-shaped welding foot layer in the present application is fused into one with the first body part after welding, eliminating the gap between the first body part and the welding nut, thereby avoiding the problem of liquid leakage and gas leakage between the first body part and the welding nut after bolt connection.

[0008] In a possible implementation of the present application, the welding nut is configured as a round nut, and the outer wall of the weld foot layer is in contact with the edge of one end face of the round nut.

[0009] In a possible implementation of the present application, a welding sealant layer is provided between the first body part and the second body part, the welding sealant layer is in a closed ring shape, and the welding sealant layer is arranged around the bolt body; one end face of the welding sealant layer is bonded to the first body part, and the other end face of the welding sealant layer is bonded to the second body part.

[0010] In a possible implementation of the present application, the shortest distance between the edge of the first body part and the edge of the first through hole is ≥12 mm, and the shortest distance between the edge of the second body part and the edge of the second through hole is ≥12 mm.

[0011] In a possible implementation of the present application, the bolt connection structure further includes an elastic member, which is disposed between the first body part and the second body part. The elastic member is in a closed ring shape and is disposed around the welding sealant layer.

[0012] In a possible implementation of the present application, a threaded section of the bolt body is provided with a thread adhesive layer, and the outer periphery of the threaded section of the welding nut is fitted with the threaded section of the welding nut.

[0013] In a possible implementation of the present application, the bolt connection structure also includes a washer, which is sleeved on the bolt body, one end surface of the washer abuts against the head of the bolt body, and the other end surface of the washer is used to abut against the second body part.

[0014] In a possible implementation of the present application, a surface of the welding nut and a surface of the bolt body are provided with an anti-rust coating.

[0015] In a second aspect, an embodiment of the present application provides a vehicle body frame, comprising the bolt connection structure provided by any embodiment of the first aspect above.

[0016] The vehicle body frame provided in the embodiment of the present application, because it includes the bolt connection structure provided in any of the embodiments of the first aspect above, has the same technical effect, that is, it can allow the welding nut to be welded to the first vehicle body part through the closed ring-shaped welding foot layer, and then allow the bolt body to pass through the first through hole and the second through hole and be screwed with the welding nut to achieve the connection effect of the first vehicle body part and the second vehicle body part. In addition, the closed ring-shaped welding foot layer in the present application is fused into one with the first vehicle body part after welding, eliminating the gap between the first vehicle body part and the welding nut, thereby avoiding the problem of liquid leakage and gas leakage between the first vehicle body part and the welding nut after bolt connection.

[0017] In a third aspect, an embodiment of the present application provides a vehicle, comprising a vehicle body frame provided by any embodiment of the second aspect above.

[0018] The vehicle provided in the embodiment of the present application, because it includes the vehicle body frame provided in any of the embodiments of the second aspect, has the same technical effect, that is, it can allow the welding nut to be welded to the first vehicle body part through the closed ring-shaped welding foot layer, and then allow the bolt body to pass through the first through hole and the second through hole and be screwed with the welding nut to achieve the connection effect of the first vehicle body part and the second vehicle body part. In addition, the closed ring-shaped welding foot layer in the present application is fused into one with the first vehicle body part after welding, eliminating the gap between the first vehicle body part and the welding nut, thereby avoiding the problem of liquid leakage and gas leakage between the first vehicle body part and the welding nut after bolt connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A front view of a bolt connection structure provided in an embodiment of the present application;

[0020] Figure 2 An exploded view of a bolt connection structure provided in an embodiment of the present application;

[0021] Figure 3 for Figure 1 Sectional view along AA;

[0022] Figure 4 A schematic structural diagram of a welding nut and a welding foot layer in a bolt connection structure provided in an embodiment of the present application.

[0023] Reference numerals:

[0024] 1. Bolt connection structure; 11. First body part; 111. First through hole; 12. Second body part; 121. Second through hole; 13. Welding nut; 14. Welding foot layer; 15. Bolt body; 151. Thread adhesive layer; 16. Welding sealant layer; 17. Washer. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the specific technical scheme of the present application will be further described in detail below in conjunction with the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application, but are not used to limit the scope of the present application.

[0026] In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "multiple" means two or more.

[0027] In addition, in the embodiments of the present application, directional terms such as "up", "down", "left" and "right" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they may change accordingly according to the changes in the orientation of the components in the drawings.

[0028] In the embodiments of the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0029] In the embodiments of the present application, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0030] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0031] The first embodiment of the present application provides a vehicle. It should be noted that the vehicle in the present application may refer to a large car, a small car, a special-purpose car, etc. For example, according to the vehicle type, the vehicle in the present application may be a sedan, an off-road vehicle, a multi-purpose vehicle (MPV) or other vehicle types. Generally, a vehicle is provided with wheels, a power source, and a transmission system arranged between the wheels and the power source. The transmission system can transmit the power provided by the power source to the wheels, so that the wheels rotate, thereby driving the vehicle to travel.

[0032] It should be noted that in the embodiments of the present application, the type of the power source of the vehicle is not limited. For example, for a fuel vehicle, the power source may refer to a fuel engine such as a gasoline engine or a diesel engine; for an electric vehicle, the power source may refer to an electric motor; for a hybrid vehicle, the power source may refer to an engine or an electric motor; for a vehicle powered by other means, the power source may refer to a device that generates power.

[0033] The vehicle provided in the first embodiment of the present application includes a vehicle body frame. The vehicle body frame is the basic structure of the vehicle, which can not only provide support for various components of the vehicle, including but not limited to the engine, gearbox, suspension system, air conditioning system, etc., but also bear the weight of passengers and cargo. In addition, the vehicle body frame can effectively absorb and disperse the impact energy in the event of a collision, thereby protecting the safety of the passengers in the vehicle.

[0034] Based on the first embodiment, the present application proposes a second embodiment. The embodiment of the present application also provides a vehicle body frame, including a bolt connection structure 1. As a connection structure in the vehicle body frame, the bolt connection structure 1 is commonly used in the vehicle body. It has the characteristics of being easy to disassemble and reassemble, which is conducive to repairing and replacing the vehicle body or damaged parts of the vehicle body; in addition, the bolt connection structure 1 is relatively compact and suitable for locations with limited space, such as locations that welding guns cannot reach, and when assembly is required in the general assembly workshop due to installation layout requirements, etc., which need to be fixed by bolt connection.

[0035] In order to solve the problem of water leakage and air leakage in bolt connection, based on the second embodiment, the present application proposes a third embodiment. Figure 1 , Figure 2 and Figure 3 The embodiment of the present application also provides a bolt connection structure 1, including a first body part 11, a second body part 12, a welding nut 13, a welding foot layer 14, and a bolt body 15; the first body part 11 is provided with a first through hole 111; the second body part 12 is provided with a second through hole 121; the bolt body 15 is used to pass through the second through hole 121 and the first through hole 111 and be threadedly connected with the welding nut 13, so that the second body part 12 is locked and fixed with the first body part 11; the welding foot layer 14 is in a closed ring shape; one side end face of the welding foot layer 14 is fixed on the welding nut 13, and the other side end face of the welding foot layer 14 is welded and fixed to the first body part 11; the welding foot layer 14 is arranged around the bolt body 15.

[0036] In this embodiment, the welding nut 13 is welded to the first body part 11 through the closed ring-shaped welding foot layer 14, and then the bolt body 15 is passed through the first through hole 111 and the second through hole 121 and is screwed to the welding nut 13, so as to achieve the connection effect of the first body part 11 and the second body part 12. Compared with the four-point welding foot layer 14 of the traditional welding square nut, there will be a gap between the welding square nut and the part after welding; the closed ring-shaped welding foot layer 14 in the present application is fused with the first body part 11 after welding, eliminating the gap between the first body part 11 and the welding nut 13, thereby avoiding the problem of liquid leakage and gas leakage between the first body part 11 and the welding nut 13 after bolt connection, thereby meeting the anti-corrosion requirements in the factory quality requirements of the whole vehicle.

[0037] It should be noted that the first body part 11 and the second body part 12 can be any parts on the body. In the embodiment of the present application, the specific types of the first body part 11 and the second body part 12 are not limited. The first body part 11 and the second body part 12 can be selected with reference to the above description of the applicable scenarios of the bolt connection structure 1. Exemplarily, the first body part 11 and the second body part 12 can be interior parts, such as instrument panels, door trims, etc., which are fixed to the body structure by bolt connection for easy disassembly and replacement; the first body part 11 and the second body part 12 can also be chassis suspension parts, such as control arms, stabilizer bar connection points, etc., which will not be described one by one here.

[0038] In addition, it should be noted that the weld foot layer 14 is in a closed ring shape, which is a complete ring structure, and its shape can be any one of a circular ring, an elliptical ring, a rectangular ring, a polygonal ring, etc. The specific shape of the closed ring can be selected according to actual welding requirements, and the specific shape of the closed ring is not limited here. As an optional embodiment, the shape of the closed ring can be set to a circular ring.

[0039] In addition, it should be noted that the type of the bolt body 15 has a variety of optional embodiments. Figure 2 The bolt body 15 can be set as a hexagonal bolt; the bolt body 15 can also be set as one of a variety of bolts such as a round head bolt, a cross head bolt, a square head bolt, a hexagon socket bolt, etc. Each type of bolt has different usage characteristics. For example, a hexagonal bolt is suitable for use with a hexagonal wrench or a socket, and a round head bolt is suitable for use with a round head screwdriver. It should be understood that the operator can select different types of bolts and corresponding installation tools according to actual installation requirements, and will not be described one by one here.

[0040] In the above embodiment, when the weld foot layer 14 is annular, if the weld nut 13 is a square nut, a hexagonal nut or other type of nut that is different from the shape of the weld foot layer 14, it will increase the difficulty of positioning the weld foot layer 14 and the part through hole. To solve the above problem, based on the third embodiment, the present application proposes a fourth embodiment. Figure 3 and Figure 4 The welding nut 13 is set as a round nut, and the outer wall of the welding foot layer 14 is in contact with the edge of one end surface of the round nut.

[0041] In this embodiment, when the round nut is positioned before welding, since the outer wall of the weld foot layer 14 fits with the edge of the end face of one side of the round nut, the operator only needs to align the screw hole of the round nut with the first through hole 111 of the first body part 11 during the positioning and alignment process, thereby reducing the difficulty of positioning; when welding, the weld foot layer 14 is located at the edge of the end face of one side of the welding round nut, which facilitates welding tools such as a welding gun to approach the weld foot layer 14 and perform welding, thereby reducing the difficulty of welding.

[0042] In addition, after the first body part 11 and the second body part 12 are connected by the bolt body 15 and the welding nut 13, there will still be a small gap between the first body part 11 and the second body part 12, which may also cause problems such as liquid leakage and air leakage. In order to solve the problem of how to eliminate the gap between the first body part 11 and the second body part 12, the present application proposes a fifth embodiment based on the third embodiment. Figure 2 , Figure 3 A welding sealant layer 16 is provided between the first body part 11 and the second body part 12. The welding sealant layer 16 is in a closed ring shape and is arranged around the bolt body 15. One end surface of the welding sealant layer 16 is bonded to the first body part 11, and the other end surface of the welding sealant layer 16 is bonded to the second body part 12.

[0043] In this embodiment, a welding sealant layer 16 is provided between the first body part 11 and the second body part 12, and the welding sealant layer 16 is in a closed ring shape, and is provided around the bolt body 15; when the bolt body 15 is bolted to the welding nut 13, the pressing force of the bolt body 15 will squeeze the welding sealant layer 16 and fill the tiny gap between the first body part 11 and the second body part 12, thereby eliminating the gap and avoiding liquid or gas leakage in the gap between the first body part 11 and the second body.

[0044] Furthermore, in order to solve the problem of how to prevent the sealant from overflowing, in other embodiments of the present application, the shortest distance between the edge of the first body part 11 and the edge of the first through hole 111 is ≥12mm, and the shortest distance between the edge of the second body part 12 and the edge of the second through hole 121 is ≥12mm.

[0045] In this embodiment, a range is set for the shortest distance between the edge of the first body part 11 and the edge of the first through hole 111, and the shortest distance between the edge of the second body part 12 and the edge of the second through hole 121, and the range is the shortest distance ≥ 12 mm, which is the shortest distance range obtained by the inventor after experiments. In order to ensure the bonding and sealing effect of the first body part 11 and the second body part 12, the amount of glue applied cannot be less than a certain value. Therefore, when the shortest distance between the edge of the first body part 11 and the edge of the first through hole 111, and the shortest distance between the edge of the second body part 12 and the edge of the second through hole 121 are less than the value of 12 mm, the pressing force of the bolt body 15 will cause the welding sealant layer 16 to overflow after being squeezed, resulting in increased cleaning costs and waste. Therefore, in this embodiment, a numerical range of the distance is set to avoid the occurrence of overflowing glue.

[0046] In addition, in some embodiments of the present application, the bolt connection structure 1 further includes an elastic member, which is disposed between the first body part 11 and the second body part 12 . The elastic member is in a closed ring shape and is disposed around the welding sealant layer 16 .

[0047] In this embodiment, by providing an elastic member between the first body part 11 and the second body part 12, when the bolt body 15 and the welding nut 13 are tightened, the first body part 11 and the second body part 12 not only squeeze the welding sealant layer 16, but also apply squeezing force to the elastic member, so that the elastic member fills the gap between the first body part 11 and the second body part 12, so that the elastic member and the welding sealant layer 16 jointly eliminate the gap between the first body part 11 and the second body part 12. In addition, since the elastic member is provided around the welding sealant layer 16, the elastic member can also provide a barrier to the squeezed welding sealant layer 16, preventing the welding sealant layer 16 from excessively overflowing after being squeezed, thereby avoiding the occurrence of glue overflow.

[0048] After the bolt body 15 and the welding nut 13 are screwed together, there is also a small gap between the threaded sections of the bolt body 15 and the welding nut 13, which may cause problems such as liquid leakage and gas leakage. In order to solve the problem of how to eliminate the gap between the bolt body 15 and the welding nut 13, based on the third embodiment, the present application proposes a sixth embodiment. Figure 2 and Figure 3 The threaded section of the bolt body 15 is provided with a thread adhesive layer 151 , and the outer periphery of the thread adhesive layer 151 is in contact with the threaded section of the welding nut 13 .

[0049] In this embodiment, the threaded section of the bolt body 15 is provided with a thread adhesive layer 151; in the process of tightening the bolt body 15 to make it threadedly connected with the welding nut 13, the extrusion force applied to the thread adhesive layer 151 between the bolt body 15 and the welding nut 13 makes it fill the tiny gap between the threaded section of the bolt body 15 and the threaded section of the welding nut 13; after the threaded connection, since the thread adhesive is an anaerobic adhesive, when the internal coating layer is isolated from the air and can be rapidly polymerized and cured at room temperature under catalysis, thereby playing a sealing role; in this application, the thread adhesive layer 151 located between the threaded sections is difficult to contact the outside air, and thus can be quickly cured after filling the gap between the bolt body 15 and the welding nut 13, thereby achieving a sealing effect and avoiding problems such as leakage of liquid and gas.

[0050] In order to solve the problem of how to prevent the bolt body 15 from causing wear to the second vehicle body part 12 when tightening, the present application proposes a seventh embodiment based on the third embodiment. Figure 1 , Figure 2 and Figure 3 The bolt connection structure 1 further includes a washer 17 , which is sleeved on the bolt body 15 , one end surface of the washer 17 abuts against the head of the bolt body 15 , and the other end surface of the washer 17 is used to abut against the second vehicle body part 12 .

[0051] In this embodiment, by providing a washer 17 between the bolt body 15 and the second body part 12, the bolt body 15 can be prevented from directly contacting the surface of the second body part 12, thereby preventing scratches or wear on the second body part 12. In addition, the washer 17 can increase the contact area between the head of the bolt body 15 and the second body part 12, thereby dispersing the pressure, reducing the pressure per unit area, and preventing the surface of the second body part 12 from being crushed or damaged.

[0052] In some embodiments of the present application, by setting the washer 17 as a sealing washer, when the bolt body 15 is threadedly connected with the welding nut 13, the head of the bolt body 15 presses the sealing washer against the second body part 12, thereby achieving a sealed fit between the second body part 12 and the bolt body 15, thereby avoiding problems such as liquid leakage and air leakage.

[0053] Furthermore, in order to solve the problem of how to prevent the welding nut 13 and the bolt body 15 from rusting, in some embodiments of the present application, the surface of the welding nut 13 and the surface of the bolt body 15 are provided with an anti-rust coating.

[0054] In this embodiment, by providing an anti-rust coating on the surface of the weld nut 13 and the surface of the bolt body 15, the surface of the weld nut 13 and the surface of the bolt body 15 are isolated from rust sources such as external air and external water sources, thereby reducing the possibility of the weld nut 13 and the bolt body 15 being rusted. Among them, there are many optional embodiments of the material of the anti-rust coating. For example, the anti-rust coating can be zinc plating, chrome plating, or nickel plating. The specific material that can be used for the anti-rust coating is not limited here.

[0055] Based on any of the above embodiments, the present embodiment provides a complete installation operation process of the bolt connection structure 1. The welding round nut and the first body part 11 are first welded into one body. After the entire circle of the weld leg layer 14 of the welding round nut is fused, the gap between the welding round nut and the first body part 11 can be completely eliminated; then, a welding sealant is applied between the first body part 11 and the second body part 12. After that, the second body part 12 is placed in the correct position to be aligned with the first body part 11 through the tooling; before the bolt connection, the bolt body 15 is fully coated with thread glue, and then the bolt body 15 is tightened so that the thread glue fills and fits the thread section of the welding round nut, eliminating the gap between the bolt body 15 and the welding round nut, and forming a thread glue layer 151 after the thread glue is cured; at the same time, through the pressing force of the bolt body 15, the welding sealant will fill the tiny gap formed by the overlap between the first body part 11 and the second body part 12, and form a welding sealant layer 16 after the welding sealant is cured.

[0056] In this embodiment, after all operations are completed, there will be no gap between the welding round nut and the first body part 11, between the first body part 11 and the second body part 12, and between the threaded fitting of the bolt body 15 and the welding round nut, thereby achieving a sealing effect. In scenarios such as rain tests or car washing processes, water will not penetrate into the vehicle, thereby avoiding problems such as liquid leakage and air leakage, and meeting the anti-corrosion requirements of the factory quality requirements for the whole vehicle.

[0057] The serial numbers of the embodiments of the present application are only for description and do not represent the advantages and disadvantages of the embodiments. The above are only preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A bolt connection structure (1), characterized in that: include: A first vehicle body part (11), wherein the first vehicle body part (11) is provided with a first through hole (111); A second vehicle body part (12), wherein the second vehicle body part (12) is provided with a second through hole (121); Weld nut (13); a bolt body (15), the bolt body (15) being used to pass through the second through hole (121) and the first through hole (111) and be threadedly connected to the welding nut (13) so as to lock and fix the second vehicle body part (12) and the first vehicle body part (11); A weld foot layer (14), the weld foot layer (14) is in a closed ring shape; one end surface of the weld foot layer (14) is fixed to the welding nut (13), and the other end surface of the weld foot layer (14) is welded and fixed to the first vehicle body part (11); the weld foot layer (14) is arranged around the bolt body (15).

2. The bolt connection structure (1) according to claim 1, characterized in that: The welding nut (13) is configured as a round nut, and the outer side wall of the welding foot layer (14) is in contact with the edge of one side end surface of the round nut.

3. The bolt connection structure (1) according to claim 1, characterized in that: A welding sealant layer (16) is provided between the first vehicle body part (11) and the second vehicle body part (12); the welding sealant layer (16) is in a closed ring shape and is arranged around the bolt body (15); one end surface of the welding sealant layer (16) is bonded to the first vehicle body part (11), and the other end surface of the welding sealant layer (16) is bonded to the second vehicle body part (12).

4. The bolt connection structure (1) according to claim 3, characterized in that: The shortest distance between the edge of the first body part (11) and the edge of the first through hole (111) is ≥12 mm, and the shortest distance between the edge of the second body part (12) and the edge of the second through hole (121) is ≥12 mm.

5. The bolt connection structure (1) according to claim 3, characterized in that: The bolt connection structure (1) further comprises an elastic member, wherein the elastic member is arranged between the first vehicle body part (11) and the second vehicle body part (12), the elastic member being in the shape of a closed ring and being arranged around the welding sealant layer (16).

6. The bolt connection structure (1) according to claim 1, characterized in that: The threaded section of the bolt body (15) is provided with a thread adhesive layer (151), and the outer periphery of the thread adhesive layer (151) is in contact with the threaded section of the welding nut (13).

7. The bolt connection structure (1) according to claim 1, characterized in that: The bolt connection structure (1) further comprises a washer (17), wherein the washer (17) is sleeved on the bolt body (15), one end surface of the washer (17) abuts against the head of the bolt body (15), and the other end surface of the washer (17) is used to abut against the second vehicle body part (12).

8. The bolt connection structure (1) according to claim 1, characterized in that: The surface of the welding nut (13) and the surface of the bolt body (15) are provided with a rust-proof coating.

9. A vehicle body frame, characterized in that: The invention comprises the bolt connection structure (1) according to any one of claims 1 to 8.

10. A vehicle, characterized in that: The vehicle body frame comprises the vehicle body frame as claimed in claim 9.

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