A press-in rivet and a connecting structure

Abstract

The utility model discloses a kind of press riveting bolt and connecting structure, including stud and the head portion of the one end portion of being arranged in the stud, the end of the stud close to the head portion also has press riveting part, the press riveting part includes the conical body extending radially outward from the outer wall surface of the stud, the projection area of the conical body towards perpendicular to the axis direction of the stud forms projection, gradually reduces from the end of its away from the head portion to the end close to the head portion. The press riveting bolt of the utility model, by setting the press riveting part of inverted cone, when press riveting bolt and plate material press riveting connection, plate material can be formed with the press riveting part limit, to significantly improve the bite force and anti-ejection capacity between press riveting bolt and plate material.

Description

Technical Field

[0001] This utility model relates to the field of bolt technology, specifically to a press-fit bolt and its connection structure. Background Technology

[0002] Press-fit bolts are fasteners used for joining sheet metal parts, and are applied in sheet metal structures in fields such as electronics, automotive, and aerospace. Press-fit bolts utilize embossed rings or other structures on their bodies to embed the bolt into a through-hole in the metal sheet under axial pressure. This creates a strong bond through localized plastic deformation of the materials, thus achieving a permanent mechanical lock between the bolt and the sheet metal.

[0003] However, press-fit bolts also have some drawbacks in use. Because press-fit bolts are locked by mechanical engagement rather than thread preload, they may experience problems such as slight loosening or bolt detachment if subjected to strong or prolonged vibration. Therefore, without additional anti-loosening fasteners, these press-fit bolts have relatively weak anti-loosening capabilities and are not suitable for use in environments with long-term vibration. Utility Model Content

[0004] To overcome the above shortcomings, the purpose of this utility model is to provide a press-fit bolt and connection structure. By setting an inverted conical press-fit part, when the press-fit bolt is press-fitted to the plate, the plate can form a limit with the press-fit part, thereby significantly improving the biting force and anti-pull-out ability between the press-fit bolt and the plate.

[0005] Technical solution: This utility model discloses a press-fit bolt, including a stud and a head disposed at one end of the stud. The stud also has a press-fit portion at the end near the head. The press-fit portion includes a tapered body extending radially outward from the outer wall surface of the stud. The projected area of ​​the tapered body in a direction perpendicular to the axis of the stud gradually decreases from the end away from the head to the end near the head.

[0006] Furthermore, the end face of the rivet portion near the head coincides with the end face of the head facing the stud.

[0007] Furthermore, the stud also includes a neck with a smooth outer wall surface, and the crimping portion is disposed on the outer wall surface of the neck.

[0008] Furthermore, the riveting part is also provided with a toothed band surrounding its outer surface, the toothed band including a plurality of vertical knurled teeth.

[0009] Furthermore, the diameter of the end of the rivet near the head is greater than or equal to the diameter of the stud.

[0010] Furthermore, the angle between the straight line containing the conical surface of the riveting part and the axis of the riveting bolt is α, and the range of α is 10°-45°.

[0011] This utility model also discloses a press-fit bolt riveting structure, including:

[0012] A press-fit bolt, comprising a stud and a head disposed at one end of the stud, wherein the stud has a press-fit portion at the end near the head, the press-fit portion comprising a tapered body extending radially outward from the outer wall surface of the stud, the projected area of ​​the tapered body in a direction perpendicular to the axis of the stud gradually decreasing from the end away from the head to the end near the head.

[0013] A sheet material having a through hole, wherein the riveting part is riveted into the through hole.

[0014] Furthermore, the riveting part is also provided with a toothed band surrounding its outer surface, the toothed band including a plurality of vertical knurled teeth.

[0015] The beneficial effects of this utility model are as follows:

[0016] (1) This utility model provides a pressing part at one end of the stud near the head. The pressing part includes a conical body extending radially outward from the outer wall surface of the stud, so that the plate deformation and pressing part form a limit after pressing, which significantly improves the biting force and anti-pull-out ability between the pressing nut and the plate.

[0017] (2) The end face of the press-fit part coincides with the end face of the bolt head. The press-fit part and the head are an integral structure, thereby ensuring the flatness of the plate after installation and the rigidity of the overall structure.

[0018] (3) A toothed band composed of vertical knurled teeth is provided on the outer surface of the riveting part to further enhance the mechanical interlocking force and anti-rotation capability between the riveting part and the plate, and prevent the bolt from rotating or loosening due to vibration or torque load during use, thereby improving the long-term reliability of the connection.

[0019] (4) The angle between the straight line of the cone surface of the riveting part and the axis of the riveting bolt is α. The range of α angle is 10°-45°. During the riveting process, good gradual deformation can be achieved, and the pressing resistance will not be too high due to the large angle, thus taking into account both the ease of installation and the reliability of the structure. Attached Figure Description

[0020] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely schematic to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances. In the drawings:

[0021] Figure 1 This is a schematic diagram of the structure of the press-fit bolt described in this utility model;

[0022] Figure 2 This is a front view of the press-fit bolt described in this utility model;

[0023] Figure 3 This is a cross-sectional view of the press-fit bolt described in this utility model;

[0024] Figure 4 This is a schematic diagram of the press-fit bolt connection structure described in this utility model.

[0025] In the diagram: 1. Stud; 2. Head; 3. Riveting part; 31. Toothed belt; 4. Neck; 5. Plate; 51. Through hole. Detailed Implementation

[0026] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0027] In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The implementation methods of this utility model will now be described based on its overall structure.

[0028] like Figures 1 to 2As shown, this utility model discloses a press-fit bolt, including a stud 1 and a head 2 disposed at one end of the stud 1. The stud 1 also has a press-fit portion 3 at the end near the head 2. The press-fit portion 3 has a tapered body extending radially outward from the outer wall surface of the stud 1. The projected area of ​​the tapered body in a direction perpendicular to the axis of the stud 1 gradually decreases from the end away from the head 2 to the end near the head 2.

[0029] With the above structure, the conical surface of the cone-shaped body of the rivet part 3 gradually extends inward from the end away from the head 2 to the end closer to the head 2.

[0030] During the press-fit installation process, the plate 5 is riveted to the press-fit bolt by the pressure of the press-fit die. Since the press-fit part 3 is conical, it first enters the through hole 51 of the plate 5 from the end with the larger diameter. Then, the press-fit die applies axial pressure to the plate 5, thereby gradually pressing the plate 5 into the limiting area where the press-fit part 3 and the head 2 form an angle. After the plate 5 is riveted and fixed with the press-fit bolt, due to the conical structure of the press-fit part 3, the end away from the head 2 has a larger diameter, which can form an effective self-locking structure with the plate 5, giving the press-fit bolt a strong resistance to being pushed out and preventing the press-fit nut from separating from the plate 5.

[0031] In this embodiment, the end face of the riveting part 3 near the head 2 coincides with the end face of the head 2 facing the stud 1, forming a uniform bottom surface. When the riveting bolt is pressed into the hole of the plate 5, as the riveting part 3 gradually embeds into the through hole 51 of the plate 5, when the riveting part 3 is fully pressed into the preset depth of the punch hole of the plate 5, the end face of the bolt head 2 fits against the end face of the plate 5. At this time, the contact surface of the head 2 not only bears the pressing load, but also plays a positioning and stopping role, ensuring that the end point of pressing is accurate and avoiding over-pressure or under-pressure that could lead to a loose connection or damage to the plate 5.

[0032] In this embodiment, the stud 1 also includes a neck 4, which has a smooth outer wall surface, and the press-fit part 3 is disposed on the outer wall of the neck 4. When the press-fit bolt is riveted to the plate 5, since the neck 4 itself does not have threads or other concave and convex structures, it is beneficial to ensure the uniformity of deformation of the press-fit bolt and the plate 5 when they are riveted together, avoid stress concentration in the bolt neck 4, thereby improving the riveting quality and connection reliability.

[0033] In this embodiment, the riveting part 3 is provided with a toothed band 31 surrounding its outer surface. The toothed band 31 includes several vertical knurled teeth, thereby improving the anti-rotation capability of the riveting bolt after it is riveted to the plate 5. After the riveting bolt is pressed into the through hole 51 of the plate 5, it is subjected to torque load for a long time, which may cause slight rotation, resulting in loosening or failure of the connection. During the pressing process, the knurled teeth will embed into the inner wall of the through hole 51 of the plate 5, forming a mechanical interlocking structure, which greatly improves the coefficient of friction and contact force, thereby effectively suppressing the rotation of the riveting bolt during use and improving the connection stability and reliability.

[0034] Furthermore, the diameter of the end of the press-fit part 3 near the head 2 is greater than or equal to the diameter of the stud 1, thereby ensuring that a stable connection can be formed after the press-fit part 3 is press-fitted to the plate 5. When the plate 5 is deformed and riveted to the press-fit part 3, the part of the press-fit part 3 near the head 2 engages or contacts the opening of the plate 5, thereby being squeezed. The larger the diameter of the end face of the press-fit part 3 near the head 2, the more stable its connection with the head 2, which helps to avoid the risk of breakage between the press-fit part 3 and the head 2 due to stress concentration.

[0035] like Figure 3 As shown, in this embodiment, the angle between the straight line containing the conical surface of the press-fit part 3 and the axis of the press-fit bolt is α, and the range of α is 10°-45°. The purpose of keeping the value of α within the range of 10°–45° is to achieve a reasonable trade-off between press-fit deformation efficiency and the reliability of press-fit strength. If the angle is too small, below 10°, the conical surface is relatively steep relative to the direction perpendicular to the axial direction. Although it is relatively easy to rivet the plate 5 to the press-fit part 3 during the press-fit process, it cannot maintain a reliable resistance to push-out. If the angle exceeds 45°, although the press-fit part 3 and the plate 5 can have a strong resistance to push-out after riveting, the radial expansion force during the press-fitting process of the plate 5 and the press-fit part 3 is enhanced because the conical surface is relatively gentle relative to the direction perpendicular to the axial direction. This will significantly increase the axial force required for press-fitting and easily cause local stress concentration or cracks in the plate 5.

[0036] When the angle α is within the range of 10°–45°, the conical surface can generate effective interference force during the pressing process without excessively damaging the structure of the sheet metal 5, making it suitable for various sheet metal thicknesses and material strengths. In practice, the specific value of α can be optimized based on factors such as the hardness of the sheet metal 5, the hole diameter tolerance, and the capabilities of the pressing equipment to ensure a smooth riveting process, a firm connection, and stable finished product quality.

[0037] like Figure 4 As shown, this utility model also discloses a press-fit bolt connection structure, including:

[0038] A press-fit bolt, comprising a stud 1 and a head 2 disposed at one end of the stud 1, wherein the stud 1 also has a press-fit portion 3 at the end near the head 2, the press-fit portion 3 comprising a tapered body extending radially outward from the outer wall surface of the stud 1, the projected area of ​​the tapered body in a direction perpendicular to the axis of the stud 1 gradually decreasing from the end away from the head 2 to the end near the head 2;

[0039] Plate 5, the plate 5 having a through hole 51, the riveting part being riveted into the through hole 51.

[0040] Preferably, the riveting part 3 is also provided with a toothed band 31 surrounding its outer surface. Specifically, the toothed band 31 includes a number of vertically distributed knurled teeth. When the riveting part 3 is riveted to the plate 5, due to the toothed band 31, when the riveting part 3 of the riveting bolt is riveted to the plate 5, part of the plate 5 is deformed due to the riveting pressure, thereby further engaging with the toothed band 31 on the riveting part 3. Thus, when encountering a working environment with large vibration or torque load, the connection structure can have strong anti-torsion ability.

[0041] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A press-fit bolt, characterized in that, The device includes a stud and a head disposed at one end of the stud. The stud also has a press-fit portion at the end near the head. The press-fit portion includes a tapered body extending radially outward from the outer wall surface of the stud. The projected area of ​​the tapered body in a direction perpendicular to the axis of the stud gradually decreases from the end away from the head to the end near the head.

2. The press-fit bolt according to claim 1, characterized in that, The end face of the rivet part near the head coincides with the end face of the head facing the stud.

3. The press-fit bolt according to claim 1, characterized in that, The stud also includes a neck, which has a smooth outer wall surface, and the crimping part is disposed on the outer wall surface of the neck.

4. The press-fit bolt according to claim 1, characterized in that, The riveting part is also provided with a toothed band surrounding its outer surface, the toothed band including a number of vertical knurled teeth.

5. The press-fit bolt according to claim 1, characterized in that, The diameter of the end of the rivet near the head is greater than or equal to the diameter of the stud.

6. The press-fit bolt according to claim 1, characterized in that, The angle between the conical surface of the riveting part and the axis of the riveting bolt is α, and the range of α is 10°-45°.

7. A press-fit bolt connection structure, characterized in that, include: A press-fit bolt, comprising a stud and a head disposed at one end of the stud, wherein the stud has a press-fit portion at the end near the head, the press-fit portion comprising a tapered body extending radially outward from the outer wall surface of the stud, the projected area of ​​the tapered body in a direction perpendicular to the axis of the stud gradually decreasing from the end away from the head to the end near the head. A sheet material having a through hole, wherein the riveting part is riveted into the through hole.

8. The press-fit bolt connection structure according to claim 7, characterized in that, The riveting part is also provided with a toothed band surrounding its outer surface, the toothed band including a number of vertical knurled teeth.

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