Anti-drop pressing rivet bolt

Abstract

The utility model discloses an anti-drop pressing rivet bolt which comprises a screw rod and a bolt cap located at the end of the screw rod, a protruding ring coaxial with the screw rod is arranged at the position, close to the bolt cap, of the screw rod, and a plurality of protrusions are arranged on the face, corresponding to the screw rod, of the bolt cap in the circumferential direction. The position, corresponding to the protruding ring, of the protrusion is transited to the edge of the side, away from the bolt cap, of the protruding ring through an arc, a containing groove used for containing chippings is formed in the circumferential face of the protruding ring in the circumferential direction, the containing groove is formed by rotary cutting of the protruding ring in the circumferential direction, and a barb structure is formed through transition of the arc cut off through rotary cutting. The anti-disengaging performance can be improved, meanwhile, the installation procedure is simplified, the cost is controlled, and the problems that a traditional pressing rivet bolt is prone to loosening and poor in connection reliability under the dynamic working condition are effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a fastener, in particular to a anti-loose rivet bolt. BACKGROUND

[0002] The rivet bolt in the prior art is widely used in the fields of automobile, electronic equipment and mechanical manufacturing, and mainly forms mechanical engagement with the parts to be connected through the press-in structure to improve the circumferential anti-rotation capability. However, the conventional rivet bolt is prone to loosening under the conditions of vibration, impact or long-term load, especially under dynamic working conditions, and the problem of insufficient anti-loose performance is more prominent, which may lead to connection failure, part falling off and even safety accidents. Although some designs adopt additional anti-loose structures such as locking washers or glue coating, such schemes have defects such as complex installation process and increased cost. SUMMARY

[0003] In view of the deficiencies in the prior art, the utility model aims to provide an anti-loose rivet bolt which can improve the anti-loose performance, simplify the installation process, control the cost and effectively solve the problem of easy loosening of the conventional rivet bolt under dynamic working conditions and poor connection reliability.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: an anti-loose rivet bolt, comprising a screw rod and a bolt cap located at the end of the screw rod, a convex ring coaxially arranged on the screw rod at a position close to the bolt cap, a plurality of protrusions arranged on one side of the bolt cap corresponding to the screw rod along the circumference, the protrusions corresponding to the positions of the convex ring are transitioned to the edge of the convex ring away from the bolt cap through an arc, a containing groove for containing debris is arranged on the circumferential surface of the convex ring along the circumference, the containing groove is formed by rotary cutting of the convex ring along the circumference, and a barb structure is formed by the arc transition of the rotary cutting.

[0005] As a further improvement of the utility model, the barb structures are uniformly distributed along the circumference of the convex ring, and the number is 6-12.

[0006] As a further improvement of the utility model, the depth of the containing groove is 1 / 3-1 / 2 of the thickness of the convex ring, and the groove bottom is arc transitioned.

[0007] As a further improvement of the utility model, the protrusions are trapezoidal, and the lower base is connected to the bolt cap and the upper base is used for abutting against the parts to be connected.

[0008] As a further improvement of the utility model, the screw rod, the bolt cap, the convex ring and the protrusions are integrally formed.

[0009] As a further improvement of the utility model, one end of the convex ring corresponding to the end of the bolt is provided with knurling.

[0010] As a further improvement of the utility model, the circumferential outer surface of the convex ring is provided with knurling.

[0011] The utility model discloses the beneficial effect, through setting up arc transition between the bulge and convex ring of the bolt cap, can guide bolt to be connected to the installation hole of the component smoothly in the pressure riveting process, avoid the bulge and the edge of installation hole and take place jam or collision, promote installation convenience, simultaneously, the accommodating groove of convex ring periphery can collect the scrap produced in the installation hole inner wall when pressure riveting, prevent the scrap and stack up between convex ring and installation hole and affect the degree of fit of both, guarantee the stability of mechanical bite, and the barb structure formed by rotary cutting can hook the installation hole inner wall after bolt pressure, form mechanical lock, effectively resist the loosening tendency of vibration, impact or long -term load, significantly improve the anti -drop performance, solve the problem that traditional pressure riveting bolt is easy to loosen, and connect invalid, and need not additional locking washer or carry out gluing treatment, simplified installation procedure, reduced production and use cost. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the three-dimensional structure schematic diagram of the utility model;

[0013] Figure 2 It is the test structure schematic diagram of the utility model;

[0014] Figure 3 It is Figure 1 The enlarged view of A part in

[0015] Figure 4 It is the enlarged view of B part in Figure 2

[0016] Reference numeral: 1, screw rod, 2, bolt cap, 3, convex ring, 4, bulge, 5, arc transition, 6, accommodating groove, 7, barb structure. DETAILED DESCRIPTION

[0017] The utility model will be further detailed in the following with the embodiment given by the accompanying drawings.

[0018] Refer to Figures 1-4 ​As shown, the anti-loose rivet bolt of the embodiment comprises a screw rod 1, a bolt cap 2 at the end of the screw rod 1, a convex ring 3 coaxially arranged on the screw rod 1 near the bolt cap 2, a plurality of protrusions 4 arranged on one side of the bolt cap 2 corresponding to the screw rod 1 in the circumferential direction, the protrusions 4 correspond to the positions of the convex ring 3 and are connected to the edge of the convex ring 3 away from the bolt cap 2 through an arc-shaped transition 5, and a containing groove 6 for containing debris is arranged on the circumferential surface of the convex ring 3 in the circumferential direction. The containing groove 6 is formed by rotary cutting of the convex ring 3 in the circumferential direction, and the arc-shaped transition 5 cut by rotary cutting forms a barb structure 7. Among them, the screw rod 1 and the bolt cap 2 are coaxially fixedly connected (preferably integrally formed), the convex ring 3 and the screw rod 1 are coaxially fixedly connected (preferably integrally formed), the protrusions 4 and the end face of the bolt cap 2 facing the screw rod 1 are fixedly connected (preferably integrally formed), the arc-shaped transition 5 is an integrated connection structure between the protrusions 4 and the convex ring 3, the containing groove 6 is an integrated groove structure on the circumferential surface of the convex ring 3, and the barb structure 7 is a structure formed integrally with the convex ring 3 after rotary cutting of the containing groove 6. The arc-shaped transition 5 can be broken by rotary cutting, thereby forming the barb structure 7 from the height difference between the arc-shaped transition 5 and the convex ring 3, and the arc-shaped transition 5 has a certain guide function. Compared with the edge of the convex ring 3, the size of the arc-shaped transition 5 is the same as that of the convex ring 3, which can be easily embedded into the connected part. This scheme only needs to use rotary cutting to process the structure with barbs and the containing groove 6, and after the arc-shaped transition 5 is cut off, the barb structure 7 has a corresponding relationship with the original arc-shaped transition 5. At this time, after the barb structure 7 is used to expand the connected part, the problem of serious jamming of the position of the arc-shaped transition 5 can be avoided, and the arc-shaped transition 5 can be smoothly embedded into the connected part.

[0019] During the rivet installation, first, the installation hole of the connected part is aligned with the screw rod 1, and then axial pressure is applied to the bolt cap 2 through a rivet installation device or a nut, so that the screw rod 1 drives the convex ring 3 to gradually press into the installation hole, and the protrusions 4 can be embedded into the connected part to further form a circumferential fixation. In this process, the arc-shaped transition 5 can form a smooth transition with the edge of the entrance of the installation hole, and when the bolt is completely pressed in, the barb structure 7 will be slightly deformed due to the extrusion of the inner wall of the installation hole, the tip of the barb hooks the metal material of the inner wall of the installation hole, forming an irreversible mechanical lock. Even under the conditions of vibration, impact or long-term load, the barb structure 7 can effectively prevent the bolt from loosening in the axial or circumferential direction, significantly improve the stability of the connection, avoid the risk of connection failure and part falling off, and the entire structure does not need to be additionally assembled with a locking washer, simplifying the installation steps and reducing the assembly cost.

[0020] Preferably, the barb structures 7 are evenly distributed along the circumferential direction of the convex ring 3, and the number is 6-12.

[0021] The 6-12 evenly distributed barb structures 7 can balance the circumferential stress of the convex ring 3. When the bolt is pressed into the mounting hole of the component to be connected, each barb structure 7 will form a stable mechanical lock with the inner wall of the mounting hole, avoiding deformation or damage of the convex ring 3 due to uneven distribution of the barb, and ensuring the anti-loose force of each position of the convex ring 3, further improving the overall anti-loose stability of the bolt.

[0022] In a specific implementation, the depth of the accommodating groove 6 is 1 / 3-1 / 2 of the thickness of the convex ring 3, and the groove bottom is arc-shaped transition 5.

[0023] In the riveting process, the depth of the accommodating groove 6 is set to 1 / 3-1 / 2 of the thickness of the convex ring 3, which can ensure that the accommodating groove 6 has enough volume to collect the debris generated during riveting, avoid the debris overflowing due to the capacity of the accommodating groove 6, and avoid the strength of the corresponding position of the screw rod 1 to the convex ring 3 being excessively weakened due to the excessive groove depth.

[0024] Optionally, the protrusion 4 is trapezoidal, and the lower base is connected with the cap 2, and the upper base is used to abut against the component to be connected.

[0025] The extrusion generated by the protrusion 4 and the guiding effect of the trapezoidal inclined surface can increase the tensioning effect between the component to be connected and the protrusion 4, improve the sealing performance and the gripping force on the component to be connected, and improve the stability of the circumferential fixation.

[0026] Preferably, the screw rod 1, the cap 2, the convex ring 3 and the protrusion 4 are integrally formed. The screw rod 1, the cap 2, the convex ring 3 and the protrusion 4 are processed by an integral forming process (such as cold heading forming, forging, etc.), so that there is no splicing gap or connection interface between the parts. On the one hand, it can significantly improve the overall structural strength and mechanical properties of the bolt. The protrusion 4 and the arc-shaped transition 5 can be processed by the integral forming process, and then the accommodating groove 6 is processed by rotary cutting. At this time, the arc-shaped transition 5 can be cut off to form the barb structure 7.

[0027] In order to increase the circumferential fixation effect, one end of the convex ring 3 corresponding to the end of the bolt is provided with knurling. The knurling structure (such as straight-line knurling, mesh knurling) of the end can increase the friction force between the end surface of the convex ring 3 and the end of the inner wall of the mounting hole. In combination with the barb structure 7 on the convex ring 3, a double anti-loose guarantee of “friction force + mechanical lock” is formed.

[0028] Optionally, in another scheme, the circumferential outer surface of the convex ring 3 is provided with knurling.

[0029] The circumferential outer surface of the convex ring 3 directly contacts with the inner wall of the mounting hole of the component to be connected, and the knurling structure of the circumferential outer surface can greatly increase the friction coefficient between the two, so that the knurling of the convex ring 3 is engaged with the inner wall of the mounting hole after being pressed into the mounting hole, and the relative rotation between the convex ring 3 and the mounting hole is prevented by the friction force, further complementing the barb structure 7.

[0030] The above merely describes preferred embodiments of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments. Any technical solution falling within the concept of the present application shall fall within the protection scope of the present application. It should be noted that, for ordinary skilled persons in the art, some improvements and refinements without departing from the principles of the present application shall also be considered as falling within the protection scope of the present application.

Claims

1. A kind of anti-loose rivet bolt, including screw rod, the bolt cap in the end of screw rod, the position of the screw rod is close to the bolt cap with the coaxial setting of protruding ring on the screw rod, the one side of the bolt cap corresponding the screw rod is provided with several protrusions along the circumference, it is characterized in that, The position of the convex corresponding to the convex ring is transitioned by an arc to the edge of the side of the convex ring away from the bolt cap, an accommodating groove for accommodating debris is arranged on the circumferential surface of the convex ring along the circumference, the accommodating groove is formed by rotary cutting of the convex ring along the circumference, and the arc transition of the rotary cutting is formed into a barb structure.

2. The anti-backout press-in bolt of claim 1, wherein, The barb structures are uniformly distributed along the circumference of the convex ring, and the number is 6-12.

3. The anti-backout press-in bolt of claim 2, wherein, The depth of the accommodating groove is 1 / 3-1 / 2 of the thickness of the convex ring, and the groove bottom is arc transitioned.

4. The anti-backout press-in bolt of claim 3, wherein, The convex is trapezoidal, and the lower bottom is connected with the bolt cap, and the upper bottom is used for abutting against the to-be-connected component.

5. The anti-backout press-in bolt of claim 4, wherein, The screw rod, the bolt cap, the convex ring and the convex are integrally formed.

6. The anti-backout press-in bolt of claim 1, wherein, One end of the convex ring corresponding to the end of the bolt is provided with knurling.

7. The anti-backout press-in bolt according to claim 1 or 6, wherein The circumferential outer surface of the convex ring is provided with knurling.

Images