A fiber core column composite bolt assembly with anti-collision pre-fixing structure for automobile

Abstract

The application discloses a fiber core column composite bolt assembly with anti-impact pre-fixing structure for automobile, and relates to the technical field of automobile fasteners.The fiber core column composite bolt assembly with anti-impact pre-fixing structure for automobile comprises a fiber core column and a metal sleeve pipe, the metal sleeve pipe is sleeved on the outer side of the fiber core column, an annular gap is arranged between the inner wall of the metal sleeve pipe and the outer wall of the fiber core column, and an anti-impact supporting piece is arranged in the annular gap.The fiber core column composite bolt assembly with anti-impact pre-fixing structure for automobile realizes the radial locking of the fiber core column and the metal sleeve pipe through the clamping cooperation of the pre-fixing strips and the pre-fixing grooves, realizes the bidirectional fixation of the fiber core column and the metal sleeve pipe through the axial limiting cooperation of the wedge-shaped patterns and the wedge blocks and the locking of the upper end of the hexagonal flange nut, and the whole bolt assembly forms an integral module in the transportation, carrying and storage processes.

Description

Technical Field

[0001] This invention relates to the field of automotive fastener technology, and in particular to a fiber core composite bolt assembly for automobiles with an anti-impact pre-fixing structure. Background Technology

[0002] Fiber core composite bolts combine the high tensile strength of fiber materials with the wear resistance and shear strength of metal materials by sleeved with a metal outer tube around the main fiber core, achieving lightweight while ensuring connection strength. Existing fiber core composite bolts often feature a dispersed design or simple assembly of components such as the fiber core, metal outer tube, spring washer, and nut, lacking an effective temporary fixing mechanism and allowing for relative displacement. During transportation, carrying, or storage, factors such as shaking and collisions can cause frequent relative displacement between the fiber core and the inner wall of the sleeve, between the nut and the spring washer, and between the sleeve end and related structures of the core. This can range from minor issues like component loosening and detachment, affecting subsequent assembly efficiency, to more serious issues like metal-to-metal impacts, leading to surface damage to the fiber core, thread wear, or component deformation, severely impacting the bolt assembly's service life and assembly reliability. Summary of the Invention

[0003] The purpose of this invention is to provide a composite bolt assembly for automobiles with an anti-impact pre-fixing structure. Through the engagement of the pre-fixing strip and the pre-fixing groove, radial locking of the fiber core and the metal outer sleeve is achieved. At the same time, through the axial limiting engagement of the wedge pattern and the wedge block, and the upper locking of the hexagonal flange nut, bidirectional fixation of the fiber core and the metal outer sleeve is achieved. This makes the entire bolt assembly a whole module during transportation, handling, and storage, effectively avoiding relative displacement, loosening and falling off between components, and hard metal impacts. It also ensures the surface integrity and thread accuracy of the fiber core, thereby solving the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a composite bolt assembly for automobiles with an anti-collision pre-fixing structure, comprising a fiber core column and a metal outer sleeve, wherein the metal outer sleeve is sleeved on the outside of the fiber core column, and an annular gap is provided between the inner wall of the metal outer sleeve and the outer wall of the fiber core column, an anti-collision support is provided within the annular gap, a limiting ring is provided at the upper end of the metal outer sleeve to abut against the anti-collision support, a hexagonal flange nut is sleeved on the upper end of the fiber core column extending from the metal outer sleeve, a pre-fixing groove is provided at the lower end of the metal outer sleeve, and a pre-fixing strip is provided at the lower end of the fiber core column inside the metal outer sleeve, the pre-fixing strip engages with the pre-fixing groove to achieve radial fixation of the fiber core column and the metal outer sleeve, and at the same time the pre-fixing strip connects with the anti-collision support, the pre-fixing strip moves upward to compress the anti-collision support, the anti-collision support acts on the fiber core column and the metal outer sleeve, thereby playing the role of anti-collision energy absorption.

[0005] Preferably, the lower end of the metal outer sleeve is provided with vertical grooves at equal intervals, and the lower end of the metal outer sleeve forms annularly distributed deformable pieces due to the separation of the vertical grooves.

[0006] Preferably, the lower end of the deformable piece is provided with a wave edge, which has a wave-shaped structure. The outer wall of the wave edge protrudes to form a wave crest, and the inner wall protrudes to form a wave trough. A pre-fixing groove matching the pre-fixing strip is provided on the uppermost wave trough of the wave edge.

[0007] Preferably, a tapered push block is fixedly connected to the lower end of the fiber core column, and an external thread is provided at the upper end of the fiber core column, which engages with a hexagonal flange nut.

[0008] Preferably, a wedge is provided on the lower inner wall of the wave edge, and a wedge-shaped pattern is provided on the outer wall of the conical push block, with the wedge-shaped pattern abutting against the wedge.

[0009] Preferably, the upper diameter of the conical pusher is the same as the diameter of the fiber core column, the lower diameter of the conical pusher is larger than the upper diameter, and the upper end of the conical pusher overlaps with the wedge.

[0010] Preferably, the anti-collision supports are arranged in pairs, and the anti-collision supports are conical elastic sheets. The end of the anti-collision support with the larger diameter is provided with a pushing ring, which is connected to the pre-fixing strip. The end of the anti-collision support with the smaller diameter is provided with a connecting strip and a connector. The anti-collision supports in the same group are arranged in opposite directions and are connected by the connecting strip to form an X-shaped support structure.

[0011] Preferably, a spring washer is provided between the upper end of the metal outer sleeve and the hexagonal flange nut.

[0012] Preferably, the upper inner wall of the metal outer sleeve is provided with slots at equal intervals.

[0013] Preferably, the limiting ring has an opening, and mounting protrusions are symmetrically arranged on both sides of the opening. The outer ring of the limiting ring is provided with locking blocks that match the locking slot at equal intervals.

[0014] Compared with the prior art, the beneficial effects of the present invention are: This invention discloses a composite bolt assembly for automotive fiber core columns with an anti-impact pre-fixing structure. Through the engagement of the pre-fixing strip and the pre-fixing groove, radial locking of the fiber core column and the metal outer sleeve is achieved. Simultaneously, through the axial limiting engagement of the wedge pattern and the wedge block, and the upper locking of the hexagonal flange nut, bidirectional fixing of the fiber core column and the metal outer sleeve is achieved. This makes the entire bolt assembly form a whole module during transportation, handling, and storage, effectively avoiding relative displacement, loosening and falling off between components, and hard metal impacts, and ensuring the surface integrity and thread accuracy of the fiber core column.

[0015] In this invention, the anti-collision supports are arranged in pairs, forming an X-shaped support structure through cross-interlocking of insert strips and interfaces. When subjected to axial compression, the support undergoes conical deformation, converting impact energy into elastic potential energy and providing elastic reaction force in both the radial and axial directions. The wave edge is a wave-shaped elastic structure that absorbs axial impact energy through its own elastic deformation, providing continuous axial elastic support to the fiber core column. The combined effect of these two elastic supports effectively eliminates the assembly gap between the fiber core column and the metal outer sleeve, preventing axial movement and radial swaying of the fiber core column caused by vibration during vehicle operation, eliminating rigid impact between the fiber core column and the metal parts, and significantly extending the service life of the bolt assembly.

[0016] The wave edge of this invention undergoes elastic deformation under the pushing action of the conical pusher, and the crests and troughs are closely fitted with the bottom wall of the mounting hole, increasing the contact area and friction. The rigid outward anchoring of the deformable piece is combined with the elastic deformation of the wave edge to achieve double fixation of the mounting hole and strong pull-out resistance. Attached Figure Description

[0017] Figure 1 This is a first-view view of the automotive fiber core column composite bolt assembly with anti-impact pre-fixing structure of the present invention; Figure 2 This is a second-view view of the automotive fiber core column composite bolt assembly with anti-impact pre-fixing structure of the present invention; Figure 3 This is a diagram of the internal structure of the metal outer sleeve of the present invention; Figure 4 This is a structural diagram of the fiber core column of the present invention; Figure 5 This is a cross-sectional view of the metal outer sleeve of the present invention; Figure 6 This is a structural diagram of the anti-collision support component of the present invention; Figure 7 This is a structural diagram of the limiting ring of the present invention; In the diagram: 1. Fiber core column; 11. Pre-fixing strip; 12. Conical push block; 121. Wedge pattern; 13. External thread; 2. Metal outer sleeve; 21. Vertical groove; 22. Deformation piece; 221. Wavy edge; 2211. Pre-fixing groove; 2212. Wedge block; 23. Slot; 24. Spring washer; 3. Anti-collision support; 31. Push ring; 32. Insert strip; 33. Insertion interface; 4. Limiting ring; 41. Opening; 42. Mounting protrusion; 43. Slot; 5. Hexagonal flange nut. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1-7 A composite bolt assembly for automobiles with an anti-collision pre-fixing structure includes a fiber core 1 and a metal outer sleeve 2. The metal outer sleeve 2 is sleeved on the outside of the fiber core 1. An annular gap is provided between the inner wall of the metal outer sleeve 2 and the outer wall of the fiber core 1. An anti-collision support 3 is provided within the annular gap. A limiting ring 4 is provided at the upper end of the metal outer sleeve 2 to abut against the anti-collision support 3. A hexagonal flange nut 5 is sleeved on the upper end of the fiber core 1 from the metal outer sleeve 2. The lower end of the outer sleeve 2 is provided with a pre-fixing groove 2211. The fiber core 1 is placed inside the lower end of the metal outer sleeve 2 and a pre-fixing strip 11 is provided. The pre-fixing strip 11 engages with the pre-fixing groove 2211 to achieve radial fixation of the fiber core 1 and the metal outer sleeve 2. At the same time, the pre-fixing strip 11 is connected to the anti-collision support 3. During operation, the pre-fixing strip 11 squeezes the anti-collision support 3, and the anti-collision support 3 acts on the fiber core 1 and the metal outer sleeve 2, thereby playing the role of anti-collision and energy absorption.

[0020] Specifically, a spring washer 24 is provided between the upper end of the metal outer sleeve 2 and the hexagonal flange nut 5. The inner wall of the upper end of the metal outer sleeve 2 is provided with slots 23 at equal intervals. The limiting ring 4 is a metal ring and has an opening 41. The two sides of the opening 41 are symmetrically provided with mounting protrusions 42. The outer ring of the limiting ring 4 is provided with locking blocks 43 at equal intervals. By pinching the two mounting protrusions 42 together with fingers, the opening 41 becomes smaller, the limiting ring 4 deforms, and the locking blocks 43 can be easily inserted into the slots 23. After installation, the mounting protrusions 42 are released, and the limiting ring 4 returns to its original position under its own elasticity. The limiting ring 4 is fixed on the inner wall of the metal outer sleeve 2. The inner diameter of the limiting ring 4 is larger than that of the fiber core column 1 and can be fitted onto the outside of the fiber core column 1.

[0021] More specifically, vertical grooves 21 are evenly spaced at the lower end of the metal outer sleeve 2. Divided by the vertical grooves 21, deformable pieces 22 are formed in a ring at the lower end of the metal outer sleeve 2. The lower end of the deformable pieces 22 is provided with a corrugated edge 221. A conical push block 12 is fixedly connected to the lower end of the fiber core column 1. The conical push block 12 overlaps with the corrugated edge 221. The upper end of the fiber core column 1 is provided with an external thread 13. The external thread 13 engages with the hexagonal flange nut 5. When installing the bolt assembly, the hexagonal flange nut 5 is tightened, and the upper end of the fiber core column 1 is stretched, which drives the conical push block 12 to move toward the metal outer sleeve 2. The conical push block 12 pushes the deformable pieces 22, causing the deformable pieces 22 to flip outward and abut against the wall of the mounting hole. The deformable pieces 22 conform to the deformation of the mounting hole, increasing the friction and achieving fixation.

[0022] It is important to understand that after pre-fixation, the lower end of the deformable piece 22 is in contact with the outer wall of the conical pusher 12. The conical pusher 12 supports the deformable pieces 22 between them to prevent them from loosening during transportation. At the same time, the corrugated edge 221 has a corrugated structure and has a certain degree of elasticity, which can provide axial support for the fiber core column 1 and eliminate the axial gap of the bolt assembly. The corrugated edge 221 has a non-uniform corrugated structure. The protruding part of the outer wall of the corrugated edge 221 is called the crest, and the protruding part of the inner wall of the corrugated edge 221 is called the trough. The area enclosed by the crest has the same diameter as the metal outer sleeve 2, and the diameter of the area enclosed by the trough increases from top to bottom. Specifically, the corrugated edge 221 forms an inner wall that is conical, which facilitates the fiber core column 1 to pass through the corrugated edge 221. At the same time, the corrugated edge 221 works in conjunction with the conical pusher 12 to increase the contact area between the inner wall of the corrugated edge 221 and the conical pusher 12.

[0023] Furthermore, a pre-fixing groove 2211 matching the pre-fixing strip 11 is provided on the trough at the uppermost end of the wave edge 221. During pre-fixing, the pre-fixing strip 11 is inserted into the pre-fixing groove 2211 to radially lock the fiber core column 1 and the metal outer sleeve 2, preventing the fiber core column 1 from rotating in the metal outer sleeve 2. The length of the pre-fixing strip 11 is greater than the overall height of the wave edge 221. During pre-fixing, the position of the pre-fixing strip 11 can be observed, and a mark can be made at the lower end of the wave edge 221. The pre-fixing strip 11 can be directly inserted into the pre-fixing groove 2211 to reduce the pre-fixing resistance. In addition, a wedge block 2212 is provided on the lower inner wall of the wave edge 221, and the wedge block 2212 abuts against the conical push block 12.

[0024] Correspondingly, a wedge-shaped pattern 121 is provided on the outer wall of the conical push block 12. The upper diameter of the conical push block 12 is the same as the diameter of the fiber core column 1, and the lower diameter of the conical push block 12 is larger than the upper diameter. During pre-fixing, the wedge-shaped pattern 121 abuts against the wedge block 2212, limiting the fiber core column 1 from the lower end to prevent the fiber core column 1 from detaching from the metal outer sleeve 2. A hexagonal flange nut 5 is screwed onto the upper end of the fiber core column 1, fixing the axial direction of the fiber core column 1. The pre-fixing strip 11 is inserted into the pre-fixing groove 2211 to lock the fiber core column 1 and the metal outer sleeve 2 radially, completing the initial fixation.

[0025] To improve the support effect between the fiber core column 1 and the metal outer sleeve 2 and reduce the impact, several sets of anti-collision support members 3 are sleeved between the fiber core column 1 and the metal outer sleeve 2. Each set of anti-collision support members 3 consists of two members. Each anti-collision support member 3 is a conical elastic sheet. The end of the anti-collision support member 3 with the larger diameter is equipped with a push-out ring 31, which connects to the pre-fixing strip 11. The end of the anti-collision support member 3 with the smaller diameter is cross-shaped with a connecting strip 32 and a connector 33. The anti-collision support members 3 in the same group are arranged in opposite directions. Specifically, the lower anti-collision support member 3 in the same group has its larger diameter end facing downwards, with the connecting strip 32 and connector 33 facing upwards. The upper anti-collision support member 3 in the same group has its larger diameter end facing downwards. With one end facing upwards, the connector strip 32 and connector 33 are positioned downwards. The connector strips 32 on the anti-collision support 3 in the same group are arranged crosswise to support each other, forming multi-point support between the fiber core column 1 and the metal outer sleeve 2. During pre-fixation, the anti-collision support 3 pushes the fiber core column 1 to the center, while also increasing the strength of the middle position of the metal outer sleeve 2 to prevent it from deforming after impact. The conical elastic sheet undergoes conical surface deformation when axially compressed, converting the impact energy into elastic potential energy. The crosswise connector strips 32 in the same group form an X-shaped support structure, providing elastic reaction force in both the radial and axial directions, thereby absorbing vibration energy and reducing rigid impact between the fiber core column 1 and the metal outer sleeve 2.

[0026] When installing the bolt assembly, insert the bolt assembly into the mounting hole and tighten the hexagonal flange nut 5. As the conical pusher 12 moves towards the upper end of the metal outer sleeve 2, the conical pusher 12 continuously squeezes the deformable piece 22. The deformable piece 22 flips over, and the wave edge 221 is pushed by the conical pusher 12 to deform and fit against the mounting hole. After the pre-fixing strip 11 moves upward, it drives the anti-collision support 3 to move upward. The upper end of the metal outer sleeve 2 is provided with a limit ring 4 to abut against the anti-collision support 3, so that the anti-collision support 3 in the same group is squeezed together, and the overall height of the anti-collision support 3 is reduced. The push insertion strip 32 presses the fiber core column 1 tightly. At the same time, the anti-collision support 3 drives the extrusion ring 31 to press against the inner wall of the metal outer sleeve 2. The anti-collision support 3 provides support between the fiber core column 1 and the metal outer sleeve 2. Moreover, this support is an elastic support, which eliminates the assembly gap between the fiber core column 1 and the metal outer sleeve 2, avoids the movement of the fiber core column 1 caused by the vibration during vehicle operation, and improves the anti-collision capability.

[0027] Working process: Insert the fiber core 1 from the lower end of the metal outer sleeve 2, so that the conical push block 12 passes through the deformable piece 22 area until the upper end of the conical push block 12 overlaps with the lower end of the wave edge 221. The pre-fixing strip 11 engages with the pre-fixing groove 2211, locking the fiber core 1 and the metal outer sleeve 2 radially to prevent the fiber core 1 from rotating relative to the metal outer sleeve 2. After inserting the anti-collision support 3 in pairs, it is inserted into the metal outer sleeve 2 from the upper end of the fiber core 1. After the limiting ring 4 is inserted from the upper end of the fiber core 1, it is fixed on the inner wall of the metal outer sleeve 2. The limiting ring 4 abuts against the anti-collision support 3. The spring washer 24 is placed on the upper end of the fiber core 1, and then the hexagonal flange nut 5 is tightened. By screwing the external thread 13 onto the upper end of the fiber core column 1, a preload is applied, axially limiting the fiber core column 1 from above. At this point, the fiber core column 1 is bidirectionally fixed by the hexagonal flange nut 5 and the wedge block 2212, and radially locked by the pre-fixing strip 11 and the pre-fixing groove 2211. The fiber core column 1 and the metal outer sleeve 2 form an integral module. During transportation, multi-point elastic support is formed between the fiber core column 1 and the metal outer sleeve 2, reducing rigid impact between them and increasing the strength of the middle section of the metal outer sleeve 2 to prevent deformation after impact. The wave edge 221 absorbs axial impact energy through its own elastic deformation, providing continuous support to the fiber core column 1. Axial elastic support eliminates axial clearance in the bolt assembly, preventing axial movement of the fiber core column 1. During installation, the pre-fixed bolt assembly is inserted into the pre-drilled mounting holes on the vehicle. A wrench is used to hold the hexagonal flange nut 5 and tighten it clockwise. The fiber core column 1 is temporarily locked by the pre-fixing strip 11. The driving force generated by the rotation of the nut causes the fiber core column 1 to move axially outward relative to the metal outer sleeve 2. The upward movement of the fiber core column 1 drives the conical push block 12 to move upward synchronously. As the conical push block 12 moves upward, its lower end gradually enters the internal area of ​​the deformable plate 22, causing the deformable plate 22 to gradually flip outward around the vertical groove 21. During the upward movement of the conical push block 12, the wave... Under the pushing action of the conical pusher 12, the wave edge 221 undergoes elastic deformation, and its crests and troughs gradually fit into the bottom wall of the mounting hole, adapting to the slight unevenness of the hole wall, increasing the contact area and friction, and achieving anchoring. During the upward movement of the pre-fixing strip 11, it drives the anti-collision support 3 connected to it to move upward synchronously. When the anti-collision support 3 of the same group is squeezed by the pre-fixing strip 11 and the limiting ring 4, the insertion strip 32 and the insertion interface 33 are interlocked to form an X-shaped cross support structure. The overall height of the anti-collision support 3 of the same group is reduced, and elastic deformation is generated, which converts the impact energy into elastic potential energy, thereby absorbing the vibration energy and preventing the rigid impact from being directly transmitted to the fiber core column 1.

[0028] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A composite bolt assembly for automobiles with an anti-impact pre-fixing structure, comprising a fiber core (1) and a metal outer sleeve (2), characterized in that, The metal outer tube (2) is sleeved on the outside of the fiber core column (1). An annular gap is provided between the inner wall of the metal outer tube (2) and the outer wall of the fiber core column (1). An anti-collision support (3) is provided in the annular gap. A limiting ring (4) that abuts against the anti-collision support (3) is provided at the upper end of the metal outer tube (2). A hexagonal flange nut (5) is sleeved on the upper end of the fiber core column (1). A pre-fixing groove (2211) is provided at the lower end of the metal outer tube (2). A pre-fixing strip (11) is provided at the lower end of the fiber core column (1) inside the metal outer tube (2). The pre-fixing strip (11) engages with the pre-fixing groove (2211) to achieve radial fixation of the fiber core column (1) and the metal outer tube (2). At the same time, the pre-fixing strip (11) is connected to the anti-collision support (3). The pre-fixing strip (11) moves upward to squeeze the anti-collision support (3). The anti-collision support (3) acts on the fiber core column (1) and the metal outer tube (2) to play the role of anti-collision energy absorption. The anti-collision support (3) is in pairs. The anti-collision support (3) is a conical elastic sheet. The end of the anti-collision support (3) with a large diameter is provided with a push ring (31). The push ring (31) is connected to the pre-fixed strip (11). The end of the anti-collision support (3) with a small diameter is provided with a plug strip (32) and a plug interface (33). The anti-collision support (3) in the same group are arranged in opposite directions and are connected in a cross manner through the plug strip (32) to form an X-shaped support structure. The upper inner wall of the metal outer sleeve (2) is provided with slots (23) at equal intervals, the limiting ring (4) is provided with an opening (41), the two sides of the opening (41) are symmetrically provided with mounting protrusions (42), and the outer ring of the limiting ring (4) is provided with locking blocks (43) that match the slots (23) at equal intervals.

2. The automotive fiber core column composite bolt assembly with anti-impact pre-fixing structure according to claim 1, characterized in that: The lower end of the metal outer tube (2) is provided with vertical grooves (21) at equal intervals. Under the separation of the vertical grooves (21), the lower end of the metal outer tube (2) forms a ring-shaped deformable piece (22).

3. The automotive fiber core column composite bolt assembly with anti-impact pre-fixing structure according to claim 2, characterized in that: The lower end of the deformable piece (22) is provided with a wave edge (221). The wave edge (221) has a wave-shaped structure. The outer wall of the wave edge (221) protrudes to form a wave crest, and the inner wall protrudes to form a wave trough. A pre-fixing groove (2211) matching the pre-fixing strip (11) is opened on the uppermost wave trough of the wave edge (221).

4. The automotive fiber core column composite bolt assembly with anti-impact pre-fixing structure according to claim 3, characterized in that: The lower end of the fiber core column (1) is fixedly connected to a tapered pusher (12), and the upper end of the fiber core column (1) is provided with an external thread (13), which engages with a hexagonal flange nut (5).

5. The automotive fiber core column composite bolt assembly with anti-impact pre-fixing structure according to claim 4, characterized in that: A wedge (2212) is provided on the inner wall of the lower end of the wave edge (221), and a wedge pattern (121) is provided on the outer wall of the conical push block (12), with the wedge pattern (121) abutting against the wedge (2212).

6. The automotive fiber core column composite bolt assembly with anti-impact pre-fixing structure according to claim 5, characterized in that: The upper diameter of the conical pusher (12) is the same as the diameter of the fiber core column (1), the lower diameter of the conical pusher (12) is larger than the upper diameter, and the upper end of the conical pusher (12) overlaps with the wedge (2212).

7. The automotive fiber core column composite bolt assembly with anti-impact pre-fixing structure according to claim 1, characterized in that: A spring washer (24) is provided between the upper end of the metal outer sleeve (2) and the hexagonal flange nut (5).

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