Steel wire thread insert with high connection strength and fastening structure thereof

Abstract

The utility model discloses a steel wire thread insert with high connection strength, which comprises an external thread part and an internal thread part, the external thread part is configured to be in threaded connection with a bottom hole, and the internal thread part forms a standard internal thread hole used for being in threaded connection with a fastener. The radial cross section area of each external thread of the external thread part is larger than the radial cross section area of each external thread of the corresponding internal thread part, so that the binding force between the external thread part and the bottom hole is larger than that between the internal thread part and the fastener. By enlarging the contact area of the external thread part and the bottom hole, the effect of improving the connection strength of the wire thread insert and the bottom hole is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of fasteners, and in particular to a wire thread sleeve with high connection strength and a fastening structure thereof. Background Art

[0002] Wire thread insert is a new type of internal thread fastener, suitable for threaded connection, screwed into and fastened in the threaded hole of one of the connected parts to form a standard internal thread, and the bolt (or screw) is then screwed into it, also known as threaded thread insert, or simply thread insert. It is a spring-shaped internal and external thread concentric body made of high-strength, high-precision, smooth-surfaced cold-rolled diamond stainless steel wire, mainly used to enhance and protect the internal thread of low-strength materials. The principle is to form an elastic connection between the fastener and the internal thread of the base, eliminate thread manufacturing errors, and improve the connection strength. Wire thread inserts are embedded in the threaded holes of low-strength engineering materials such as aluminum, magnesium alloy, cast iron, fiberglass, and plastic, and can form high-precision internal threads that meet international standards. It has the functions of high connection strength, earthquake resistance, impact resistance, and wear resistance, and can disperse stress to protect the base thread, greatly extending the service life of the base, and is widely used in electronic applications.

[0003] Existing wire thread inserts are all made of high-hardness corrosion-resistant steel wire with a diamond-shaped cross-section, and are a spring-shaped internal and external threaded concentric body. During installation, there is a problem of small connection area with the threaded hole, resulting in low connection strength. Utility Model Content

[0004] In order to solve the related technical problems, the utility model provides a wire screw sleeve with high connection strength and a fastening structure thereof, so as to solve the problem of low connection strength between the wire screw sleeve and the bottom hole.

[0005] To achieve the above purpose, the embodiment of the utility model adopts the following technical solutions:

[0006] A wire thread insert with high connection strength, comprising an external thread portion and an internal thread portion, wherein:

[0007] The external threaded portion is configured to be threaded with the bottom hole, and the internal threaded portion forms a standard internal threaded hole for threading a fastener.

[0008] The radial cross-sectional area of ​​each external thread of the external thread portion is greater than the radial cross-sectional area of ​​each external thread of the corresponding internal thread portion, so that the binding force between the external thread portion and the bottom hole is greater than the binding force between the internal thread portion and the fastener.

[0009] The contact area between each external thread of the external thread part and each internal thread of the corresponding bottom hole is S1, and the contact area between each internal thread of the internal thread part and each external thread of the fastener is S2, wherein S1:S2=1.5~3.

[0010] The external threaded portion includes a first connecting surface, a second connecting surface and a third connecting surface, the first connecting surface is vertically arranged, the second connecting surface and the third connecting surface are symmetrically arranged on both sides of the first connecting surface, and the first end of the second connecting surface and the first end of the third connecting surface are respectively connected to the two ends of the first connecting surface in a vertical direction.

[0011] The first connecting surface extends from a starting end to a terminating end along a spiral rotation path of the wire thread sleeve.

[0012] The second connecting surface and the third connecting surface are both curved in an arc shape.

[0013] The internal thread portion includes a fourth connecting surface, a fifth connecting surface and a sixth connecting surface, the fourth connecting surface is vertically arranged, the fifth connecting surface and the sixth connecting surface are symmetrically arranged on both sides of the fourth connecting surface, and the first end of the fifth connecting surface and the first end of the sixth connecting surface are respectively connected to the two ends of the fourth connecting surface in a vertical direction.

[0014] The fourth connecting surface extends from the starting end to the ending end along the spiral rotation path of the wire thread sleeve.

[0015] The tail end of the wire screw sleeve is provided with a mounting handle, and the connection between the mounting handle and the wire screw sleeve is provided with a breaking groove.

[0016] A fastening structure, comprising a base, a wire thread sleeve with high connection strength and a fastener, wherein:

[0017] A bottom hole with an internal thread is provided on the base, and the external threaded portion of the high-connection-strength wire thread sleeve is screwed into the bottom hole to thread the high-connection-strength wire thread sleeve into the bottom hole, and the fastener is screwed into the standard internal threaded hole to thread the fastener into the standard internal threaded hole.

[0018] The beneficial effects of the utility model are as follows: compared with the prior art, the utility model provides a wire screw sleeve with high connection strength and a fastening structure thereof, which has the following beneficial effects:

[0019] 1. By expanding the contact area between the external thread and the bottom hole, it has the effect of improving the connection strength between the wire thread sleeve and the bottom hole;

[0020] 2. By setting the second connection surface and the third connection surface in an arc shape, the radial pressure between the external thread part and the bottom hole is increased, which has the effect of improving the connection strength between the wire thread sleeve and the bottom hole;

[0021] 3. The installation handle and the breaking groove are arranged to facilitate installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate and understand the technical solutions in the embodiments of the present invention, the following briefly introduces the background technology of the present invention and the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0023] Figure 1 It is a structural schematic diagram of a wire thread sleeve with high connection strength and its fastening structure provided by an embodiment of the utility model;

[0024] Figure 2 It is a structural schematic diagram of a wire thread sleeve with high connection strength and its fastening structure provided by an embodiment of the utility model;

[0025] Figure 3 It is a structural schematic diagram of a wire thread sleeve with high connection strength and its fastening structure provided by an embodiment of the utility model;

[0026] Figure 4 It is a structural schematic diagram of a wire thread sleeve with high connection strength and its fastening structure provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0027] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0028] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively with reference to the relevant drawings. The preferred embodiments of the utility model are given in the drawings. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thoroughly understood. It should be noted that when a component is referred to as "fixed to" another component, it can be directly on another component or there can also be a central component. When a component is considered to be "connected" to another component, it can be directly connected to another component or there may be a central component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for illustrative purposes and are not intended to be the only implementation method. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by technicians in the technical field of the utility model. The terms used in the specification of the utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the utility model. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0029] See also Figures 1 to 4 As shown, the present embodiment provides a wire thread insert with high connection strength, which includes an external threaded portion 11 and an internal threaded portion 12, the external threaded portion 11 is configured to be threadedly connected to the bottom hole 2, the internal threaded portion 12 forms a standard internal threaded hole 13 for threading the fastener 3, and the radial cross-sectional area of ​​each tooth of the external thread of the external threaded portion 11 is larger than the radial cross-sectional area of ​​each tooth of the corresponding internal threaded portion 12, so that the binding force between the external threaded portion 11 and the bottom hole 2 is greater than the binding force between the internal threaded portion 12 and the fastener 3.

[0030] It can be seen that the radial cross-sectional area of ​​the external threaded portion 11 is greater than the radial cross-sectional area of ​​the internal threaded portion 12, which increases the connection area between the external threaded portion 11 and the thread of the bottom hole 2 and increases the radial pressure of the external threaded portion 11 on the thread of the bottom hole 2, thereby having the advantage of improving the connection strength between the external threaded portion 11 and the bottom hole 2.

[0031] Preferably, the size of the internal threaded hole 13 is M6, and the size of the bottom hole 2 is M8.

[0032] As an embodiment, the contact area between each external thread of the external threaded portion 11 and each internal thread of the corresponding bottom hole is S1, and the contact area between each internal thread of the internal threaded portion 12 and each external thread of the fastener is S2, wherein S1:S2=1.5~3.

[0033] Preferably, the contact area between each external thread of the external threaded portion 11 and each internal thread of the corresponding bottom hole 2 is twice the contact area between the internal threaded portion 12 and the fastener 3, thereby improving the connection strength between the wire thread sleeve 1 and the bottom hole 2 and improving the connection quality.

[0034] As an embodiment, the external threaded portion 11 includes a first connecting surface 111, a second connecting surface 112 and a third connecting surface 113, the first connecting surface 111 is vertically arranged, the second connecting surface 112 and the third connecting surface 113 are symmetrically arranged on both sides of the first connecting surface 111, and the first end of the second connecting surface 112 and the first end of the third connecting surface 113 are respectively connected to the two ends of the first connecting surface 111 in a vertical direction.

[0035] It can be seen that the second connecting surface 112 and the third connecting surface 113 are symmetrically arranged so that when the external threaded portion 11 is connected to the bottom hole 2, the second connecting surface 112 and the third connecting surface 113 exert the same pressure on the inner wall of the bottom hole 2, thereby avoiding deformation of the thread of the bottom hole 2 due to uneven force.

[0036] As an implementation manner, the first connecting surface 111 extends from a starting end to a terminating end along a spiral rotation path of the wire thread insert 1 .

[0037] It can be seen that when the first connecting surface 111 is connected to the corresponding inner wall in the bottom hole 2 , the external threaded portion 11 can be limited to avoid problems such as thread slippage or tilted installation, thereby extending the service life of the bottom hole 2 .

[0038] As an implementation manner, the second connection surface 112 and the third connection surface 113 are both curved in an arc shape.

[0039] It can be seen that by setting the second connection surface 112 and the third connection surface 113 in an arc shape, the pressure of the external thread portion 11 on the inner wall of the bottom hole 2 can be increased, which has the advantage of improving the connection strength between the wire thread sleeve 1 and the bottom hole 2.

[0040] As an embodiment, the internal threaded portion 12 includes a fourth connecting surface 121, a fifth connecting surface 122 and a sixth connecting surface 123, the fourth connecting surface 121 is vertically arranged, the fifth connecting surface 122 and the sixth connecting surface 123 are symmetrically arranged on both sides of the fourth connecting surface 121, and the first end of the fifth connecting surface 122 and the first end of the sixth connecting surface 123 are respectively connected to the two ends of the fourth connecting surface 121 in the vertical direction.

[0041] It can be seen that the fifth connecting surface 122 and the sixth connecting surface 123 are symmetrically arranged, so that when the external threaded portion 11 is connected to the fastener 3, the threads on the fastener 3 exert consistent pressure on the fifth connecting surface 122 and the sixth connecting surface 123, thereby avoiding deformation of the threads of the internal threaded hole 13 due to uneven force.

[0042] As an implementation manner, the fourth connecting surface 121 extends from the starting end to the ending end along the spiral rotation path of the wire thread insert 1 .

[0043] It can be seen that when the fourth connecting surface 121 is connected to the corresponding connecting surface on the fastener 3, the fastener 3 can be limited to avoid problems such as thread slippage or tilted installation, thereby extending the service life of the wire thread insert 1.

[0044] As an implementation mode, a mounting handle 5 is provided at the tail end of the wire screw sleeve, and a breaking groove 6 is provided at the connection between the mounting handle 5 and the wire screw sleeve 1 .

[0045] It can be seen that the tail end of the wire thread sleeve 1 is provided with a mounting handle 5, which is convenient for installing a wrench connection, and the provision of the breaking groove 6 facilitates the removal of the mounting handle 5, which has the effect of improving the installation efficiency.

[0046] A fastening structure includes a base 4, the above-mentioned high connection strength wire thread sleeve 2 and a fastener 3. The base 4 is provided with a bottom hole 2 with an internal thread. The external thread portion of the high connection strength wire thread sleeve 1 is screwed into the bottom hole 2 to screw the high connection strength wire thread sleeve 1 into the bottom hole 2. The fastener 3 is screwed into a standard internal thread hole 13 to screw the fastener 3 into the standard internal thread hole 13.

[0047] It can be seen that by increasing the contact area between the external threaded portion 11 and the bottom hole 2, the connection strength between the wire thread sleeve 1 and the bottom hole 2 is improved, while ensuring the connection strength between the fastener 3 and the internal threaded hole 13, thereby ensuring the stability of the connection between the fastener 3 and the base 4.

[0048] The specific working principle of the above-mentioned high connection strength wire thread sleeve and its fastening structure is as follows:

[0049] Install the wire thread insert 1 on the installation wrench, align it with the bottom hole 2 preset on the base, rotate the installation wrench to insert the wire thread insert 1 into the bottom hole 2 along the thread path of the bottom hole 2, take out the installation wrench, use a punch to break the installation handle 5, take out the installation handle 5, and then rotate the fastener 3 into the internal threaded hole 13.

[0050] In the embodiments disclosed in the present invention, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "connect" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the embodiments disclosed in the present invention can be understood according to specific circumstances.

[0051] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A wire thread insert with high connection strength, characterized in that: The wire thread insert with high connection strength comprises an external thread portion and an internal thread portion, wherein: The external threaded portion is configured to be threaded with the bottom hole, and the internal threaded portion forms a standard internal threaded hole for threading a fastener. The radial cross-sectional area of ​​each external thread of the external thread portion is greater than the radial cross-sectional area of ​​each external thread of the corresponding internal thread portion, so that the binding force between the external thread portion and the bottom hole is greater than the binding force between the internal thread portion and the fastener.

2. A wire thread insert with high connection strength according to claim 1, characterized in that: The contact area between each external thread of the external thread part and each internal thread of the corresponding bottom hole is S1, and the contact area between each internal thread of the internal thread part and each external thread of the fastener is S2, wherein S1:S2=1.5~3.

3. A wire thread insert with high connection strength according to claim 1, characterized in that: The external threaded portion includes a first connecting surface, a second connecting surface and a third connecting surface, the first connecting surface is vertically arranged, the second connecting surface and the third connecting surface are symmetrically arranged on both sides of the first connecting surface, and the first end of the second connecting surface and the first end of the third connecting surface are respectively connected to the two ends of the first connecting surface in a vertical direction.

4. A wire thread insert with high connection strength according to claim 3, characterized in that: The first connecting surface extends from a starting end to a terminating end along a spiral rotation path of the wire thread sleeve.

5. A wire thread insert with high connection strength according to claim 3, characterized in that: The second connecting surface and the third connecting surface are both curved in an arc shape.

6. A wire thread insert with high connection strength according to claim 1, characterized in that: The internal thread portion includes a fourth connecting surface, a fifth connecting surface and a sixth connecting surface, the fourth connecting surface is vertically arranged, the fifth connecting surface and the sixth connecting surface are symmetrically arranged on both sides of the fourth connecting surface, and the first end of the fifth connecting surface and the first end of the sixth connecting surface are respectively connected to the two ends of the fourth connecting surface in a vertical direction.

7. A wire thread insert with high connection strength according to claim 6, characterized in that: The fourth connecting surface extends from the starting end to the ending end along the spiral rotation path of the wire thread sleeve.

8. A wire thread insert with high connection strength according to claim 1, characterized in that: The tail end of the wire screw sleeve is provided with a mounting handle, and the connection between the mounting handle and the wire screw sleeve is provided with a breaking groove.

9. A fastening structure, characterized in that: The fastening structure comprises a base, a wire thread insert with high connection strength as claimed in any one of claims 1 to 8, and a fastener, wherein: A bottom hole with an internal thread is provided on the base, and the external threaded portion of the high-connection-strength wire thread sleeve is screwed into the bottom hole to thread the high-connection-strength wire thread sleeve into the bottom hole, and the fastener is screwed into the standard internal threaded hole to thread the fastener into the standard internal threaded hole.

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