A pull-rivet fastener

Abstract

The application discloses a pull-riveting fastener, a bolt is transitionally fitted or interference fitted in a riveting shell. A first guide section of the bolt is connected with a first external thread part and a second external thread part; the external thread of the first external thread part is opposite in the direction of rotation to the external thread of the second external thread part; when the external thread of the first external thread part is left-handed, the external thread of the second external thread part is right-handed; when the external thread of the first external thread part is right-handed, the external thread of the second external thread part is left-handed; and the nominal diameter of the first external thread part is larger than the nominal diameter of the second external thread part. The riveting shell is provided with an inner cavity, the inner cavity is provided with an introduction through hole, the upper half of the introduction through hole is an internal thread hole, the lower half of the introduction through hole is a smooth hole; and the top end of the introduction through hole is provided with a guide chamfer. The pull-riveting fastener is simple in structure, easy to form, does not need secondary pressing, stable and reliable in riveting performance, low in cost, and high in processing and assembling efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of fastener manufacturing, and particularly relates to a combined structure rivet fastener for automobiles. BACKGROUND

[0002] With the development of automobile lightweight technology, the use of aluminum alloy materials and more non-metal composite parts on the vehicle body can achieve lightweight, thereby reducing the weight of the vehicle body to achieve better energy saving and environmental protection effects. At the same time, the rivet fastener improves the connection method of installing parts on thin plates, certain range of thick plates and closed plates.

[0003] The rivet fastener allows the use of a rivet gun for rivet connection, which is suitable for various occasions where pressure riveting is not applicable. When the rivet fastener is used, there is no need to tap internal threads and weld, and only a pneumatic or manual rivet gun is needed to perform one-time riveting, which is convenient and efficient.

[0004] The rivet fastener of the integrated structure is complex in structure and difficult to process, and sometimes needs to tap internal threads by cutting materials. At present, most rivet fasteners are in the form of combination, such as Figure 9 as shown, a bolt 1 and a nut 2 are connected by threads, which is low in efficiency and also needs secondary pressing to cause interference between internal and external threads, so as to achieve tight fit and ensure the stability of the combination to prevent the threads from loosening and the bolt 1 from falling off during riveting. However, the secondary pressing will cause the increase of processing cost. SUMMARY

[0005] To solve the problems existing in the prior art, the present application provides a rivet fastener. The rivet fastener is simple in structure, easy to form, does not need secondary pressing, stable and reliable in riveting performance, low in cost, and high in processing and assembly efficiency.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] A rivet fastener, comprising a bolt and a riveting shell, the bolt is transitionally fitted or interference fitted in the riveting shell; wherein,

[0008] The bolt comprises a first external thread part, a first guide section, a second external thread part and a second guide section connected in sequence as a whole; wherein, the first guide section connects the first external thread part and the second external thread part; the rotation direction of the external thread of the first external thread part is opposite to that of the external thread of the second external thread part; when the external thread of the first external thread part is left-handed, the external thread of the second external thread part is right-handed; when the external thread of the first external thread part is right-handed, the external thread of the second external thread part is left-handed; and the nominal diameter of the first external thread part is greater than that of the second external thread part;

[0009] The riveting shell has an inner cavity provided with a lead-in through hole, an upper half of the lead-in through hole is a female screw hole, and a lower half of the lead-in through hole is a smooth hole; and a top end of the lead-in through hole is provided with a guide chamfer.

[0010] The riveting fastener is characterized in that the bolt is made of carbon steel, aluminum alloy, copper, titanium alloy or magnesium alloy; and the riveting shell is made of carbon steel, aluminum alloy, copper, titanium alloy or magnesium alloy.

[0011] The riveting fastener is characterized in that the first guide section is a frustum formed by gradually reducing from the bottom of the first external thread part to the top of the second external thread part; and the second guide section is a frustum formed by gradually reducing downward from the bottom of the second external thread part.

[0012] The riveting fastener is characterized in that the outer cavity wall of the riveting shell is provided with a deformation part and a support part at a position corresponding to the smooth hole, the deformation part and the support part are arranged from top to bottom on the outer cavity wall, the support part is in a stepped shape, and the diameter of the stepped support part is greater than that of the deformation part.

[0013] The technical solution has the following beneficial effects:

[0014] Firstly, the bolt and the riveting shell of the riveting fastener are in transition fit or interference fit, which is simple in structure and does not need secondary pressing, thereby effectively improving the processing and assembling efficiency and reducing the cost.

[0015] Secondly, the first external thread part and the second external thread part of the bolt adopt external threads in opposite directions, the first external thread part rotates in the tightening direction when the riveting gun is tightened, so that the bolt is not easy to fall off, and the stability of the riveting performance of the riveting fastener is well guaranteed.

[0016] Thirdly, the external thread provided on the second external thread part of the bolt not only facilitates the connection of the riveting gun, but also provides the function of the second external thread part extending out of the plate to be processed and being used as a connecting screw. DETAILED DESCRIPTION

[0017] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and serve to explain the principles of the application. In the drawings:

[0018] Figure 1 is a schematic view of the bolt according to the present application;

[0019] Figure 2 is a schematic view of the riveting shell according to the present application;

[0020] Figure 3 is a sectional structure schematic diagram of the riveting shell of the present application;

[0021] Figure 4 is a three-dimensional structure schematic diagram of the riveting combination of the rivet fastener of the present application before riveting;

[0022] Figure 5 is a sectional structure schematic diagram of the riveting combination of the rivet fastener of the present application before riveting;

[0023] Figure 6 is a three-dimensional structure schematic diagram of the riveting combination of the rivet fastener of the present application;

[0024] Figure 7 is a sectional structure schematic diagram of the riveting combination of the rivet fastener of the present application;

[0025] Figure 8 is Figure 7 is an enlarged structure schematic diagram of C part of

[0026] Figure 9 is a structure schematic diagram of the prior art bolt (the arrow a in the figure is the clockwise tightening direction; the arrow b in the figure is the clockwise tightening direction);

[0027] Figure 10 is a structure schematic diagram of the bolt of the present application (the arrow A in the figure is the counterclockwise tightening direction; the arrow B in the figure is the clockwise tightening direction. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects of the present application more clear, explicit and understandable, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application.

[0029] In the claims, specification and above drawings of the present application, unless otherwise explicitly defined, the terms such as "first", "second" or "third" are used only to distinguish different objects, and are not used to describe a specific order.

[0030] In the claims, the specification, and the drawings of the present application, terms such as "center", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counterclockwise", etc. are used as terms of reference and are not intended to limit the present application to any particular spatial orientation or configuration. Unless otherwise defined, all terms used in disclosing the application, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. By the terms "comprising" or "including", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that any process or method procedures that consists of, includes, or is followed by other procedures, are not excluded.

[0031] In the claims, the specification, and the drawings of the present application, unless otherwise expressly specified, terms such as "fixedly connected" or "fixedly connected" should be interpreted broadly, i.e. any connection mode between the two without displacement relationship and relative rotation relationship, that is, it includes non-detachable fixed connection, detachable fixed connection, integration and fixed connection through other devices or elements.

[0032] In the claims, the specification, and the drawings of the present application, the terms "comprising", "having" and their variants are intended to mean "including but not limited to".

[0033] Now, the pull rivet fastener of the present application will be described in detail. Figures 1 to 8 The pull rivet fastener of the present application comprises a bolt 100 and a riveting shell 200, and the bolt 100 is transitionally fitted or interference fitted in the riveting shell 200. The bolt 100 and the riveting shell 200 in this embodiment can be made of carbon steel, aluminum alloy, copper, titanium alloy or magnesium alloy, and are particularly suitable for the pull rivet fastener with soft riveting shell 200.

[0034] The bolt 100 of the present application comprises a head 110, a first external thread portion 120, a first guide section 130, a second external thread portion 140 and a second guide section 150 connected in sequence.

[0035] The head 110 of the present application has a diameter greater than that of the first thread portion 120.

[0036] The first guide section 130 of the present application connects the first external thread portion 120 and the second external thread portion 140. The first guide section 130 is in the shape of a truncated cone gradually tapering from the bottom of the first external thread portion 120 to the top of the second external thread portion 140.

[0037] The second guide section 150 of the present application is in the shape of a truncated cone gradually tapering downward from the bottom of the second external thread portion 140.

[0038] The external thread of the first external thread portion 120 is left-handed or right-handed.

[0039] The external thread of the second external thread part 140 is opposite to the external thread of the first external thread part 120, that is, when the external thread of the first external thread part 120 is left-handed external thread, the external thread of the second external thread part 140 is right-handed external thread; when the external thread of the first external thread part 120 is right-handed external thread, the external thread of the second external thread part 140 is left-handed external thread. And the nominal diameter of the first external thread part 120 is greater than the nominal diameter of the second external thread part 140.

[0040] In the embodiment, the bolt 100 is 32-34mm in length, wherein the external thread of the first external thread part 120 connected with the head part 110 is M8 left-handed external thread 9.5-10.5mm in length. The diameter of the head part 110 is φ8-9.5mm, and the head part can be designed as triangle, polygon, etc.

[0041] The external thread of the second external thread part 140 in the embodiment is right-handed external thread 10-12mm in length. The diameter of the bottom of the second guide section 150 connected with the bottom of the second external thread part 140 is φ4.2-4.9mm. The second external thread part 140 does not participate in the combination process with the riveting shell 200, and its main function is also only to extend a certain length of external thread part, so that it can be connected with the riveting gun during riveting. Therefore, the length and thread size of the second external thread part 140 can be changed according to different design requirements, and the extended length after being combined with the riveting shell 200 is enough to be clamped by the riveting gun.

[0042] The inner cavity of the riveting shell 200 is provided with a lead-in through hole 210, the upper half of the lead-in through hole 210 is an internal thread hole 211, and the lower half of the lead-in through hole 210 is a light hole 212. The outer cavity wall of the riveting shell 200 is provided with a deformation part 220 and a support part 230 at the position corresponding to the light hole 212, the deformation part 220 and the support part 230 are arranged from top to bottom on the outer cavity wall, and the support part 230 is stepped, and the diameter of the stepped support part 230 is greater than the diameter of the deformation part 220.

[0043] The top port of the lead-in through hole 210 is provided with a guide chamfer 213.

[0044] Before riveting combination, the bolt 100 is inserted into the riveting shell 200 through the lead-in through hole 210, and the second guide section 150 is abutted against the guide chamfer 211 of the lead-in through hole 210 of the riveting shell 200.

[0045] During riveting, the first external thread portion 120 of the bolt 100 is either transition-fitted or interference-fitted with the internal threaded hole 211 of the riveting housing 200. When the first external thread portion 120 and the internal threaded hole 211 are interference-fitted, the recommended tolerance for the thread pitch diameter is 2H / 3m; when the first external thread portion 120 and the internal threaded hole 211 are transition-fitted, the recommended tolerance for the thread pitch diameter is 4H / 2km; and the torque required for the first external thread portion 120 to screw into and out of the internal threaded hole 211 should preferably be greater than 1nm.

[0046] When the first external thread portion 120 of the bolt 100 of the present invention is transitionally fitted or interference-fitted with the internal threaded hole 211 of the riveting housing 200, interference occurs at the thread, such as... Figure 8 As shown, the radial friction force provides sufficient torque, and the shear force between the axial thread teeth provides sufficient pull-out strength, combining the bolt 100 and the riveting housing 200 into a whole; no secondary pressing is required, which effectively improves processing and assembly efficiency, reduces costs, and ensures the stability of riveting performance.

[0047] Most existing thread designs are right-handed, such as... Figure 9 As shown, the upper external thread 11 and lower external thread 12 of bolt 1 in a typical rivet fastener are both right-handed, and both are tightened clockwise. When the rivet gun tightens the lower external thread 12, the upper external thread 11 will rotate in the direction of loosening, causing bolt 1 to loosen and potentially fall off. The same principle applies when connecting other components at the tail end after riveting.

[0048] like Figure 10 The bolt 100 of the riveting fastener of the present invention has a left-hand thread on the first external thread portion 120 and a right-hand thread on the second external thread portion 140. When the first external thread portion 120 is tightened counterclockwise, the second external thread portion 140 is tightened clockwise. When the rivet gun tightens the second external thread portion 140, the first external thread portion 120 will rotate in the tightening direction, so the bolt 100 is not easy to fall off. The same principle applies when connecting other components at the tail end after riveting.

[0049] The foregoing description illustrates and describes preferred embodiments of the present invention. As previously stated, the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A rivet fastener, characterized in that, Includes a bolt (100) and a riveted housing (200), wherein the bolt (100) is fitted with a transition fit or an interference fit in the riveted housing (200); wherein, A bolt (100) includes a first external threaded portion (120), a first guide section (130), a second external threaded portion (140), and a second guide section (150) sequentially connected as a single unit; the first guide section (130) connects the first external threaded portion (120) and the second external threaded portion (140); the external threads of the first external threaded portion (120) and the second external threaded portion (140) have opposite directions of rotation; when the external thread of the first external threaded portion (120) is a left-hand external thread, the external thread of the second external threaded portion (140) is a right-hand external thread; when the external thread of the first external threaded portion (120) is a right-hand external thread, the external thread of the second external threaded portion (140) is a left-hand external thread; and the nominal diameter of the first external threaded portion (120) is greater than the nominal diameter of the second external threaded portion (140). A riveted housing (200) has an inner cavity with an inlet through hole (210). The upper half of the inlet through hole (210) is an internal threaded hole (211), and the lower half is a smooth hole (212). The top end of the inlet through hole (210) has a guide chamfer (213). The bolt (100) is made of carbon steel, aluminum alloy, copper, titanium alloy or magnesium alloy; the riveting housing (200) is made of aluminum alloy; and the outer cavity wall of the riveting housing (200) is provided with a deformable part (220) and a support part (230) at the position corresponding to the light hole (212). The deformable part (220) and the support part (230) are arranged from top to bottom on the outer cavity wall, and the support part (230) is stepped, and the diameter of the stepped support part (230) is larger than the diameter of the deformable part (220).

2. A rivet fastener according to claim 1, characterized in that, The first guide section (130) is a frustum-shaped structure formed by gradually narrowing from the bottom of the first external thread portion (120) to the top of the second external thread portion (140); the second guide section (150) is a frustum-shaped structure formed by gradually narrowing from the bottom of the second external thread portion (140) downwards.

Images