Welding nut and thread fastening kit

Abstract

The utility model discloses a welding nut and a thread fastening kit, the welding nut comprises a nut main body, the nut main body is provided with an internal thread hole, and the top surface of the internal thread hole is connected with an annular limiting part; the multiple welding bosses are arranged, and the multiple welding bosses are all arranged on the bottom face of the nut body; the shielding part is provided with a plurality of movable covers, the movable covers are jointly used for covering the inner threaded hole, each movable cover comprises a connecting end and an overhead end, the size of each movable cover is gradually increased from the overhead end to the connecting end, and the connecting ends of all the movable covers are limited between the top face of the inner threaded hole and the annular limiting part. Compared with the prior art, the internal thread of the welding nut can be repeatedly protected from being polluted by coating, and the welding nut is durable.

Description

Technical Field

[0001] This utility model relates to the technical field of mechanical parts, and in particular to welded nuts and threaded fastening kits. Background Technology

[0002] A weld nut is a type of nut suitable for welding. It is generally made of weldable materials and consists of a nut body and a weld base. The weld base is connected to other parts by resistance welding, while the nut body is connected to the bolt by threads, forming a fastener.

[0003] In the automotive manufacturing industry, weld nuts are often spot-welded to steel plates, and then screwed on with bolts after welding to facilitate the assembly of automotive parts. However, in some production processes, it is also necessary to apply anti-rust spraying to automotive parts with weld nuts. During the spraying process, if the paint gets sprayed onto the internal threads of the weld nut, then during subsequent assembly, because the inner diameter of the weld nut is smaller, there will be tolerances in the connection between it and the bolt, and the threads are very easy to damage during connection, leading to stripping.

[0004] In related technologies, such as the "Welding Nut" with publication number JP03113111A, a shielding part 4 is provided on the top surface of the nut. Although the shielding part 4 can prevent paint from entering the internal threaded hole during spraying and avoid contamination of the internal thread of the welding nut by paint, since the shielding part 4 is for single use and difficult to restore, when automotive parts need to be returned to the factory for repair, repair personnel cannot protect the internal thread of the welding nut from paint contamination again. Therefore, certain technical defects still exist in the prior art. Utility Model Content

[0005] The present invention aims to provide a welded nut that can protect the internal threads from paint contamination and can be reused.

[0006] The welding nut according to a first aspect embodiment of the present invention comprises:

[0007] The nut body has an internal threaded hole, and the top surface of the internal threaded hole is connected to an annular limiting part;

[0008] The welding boss is provided in multiple forms, and all of the welding bosses are located on the bottom surface of the nut body.

[0009] The shielding part is provided with multiple movable covers, which together cover the internal threaded hole. Each movable cover includes a connecting end and a suspended end. The size of the movable cover gradually increases from the suspended end to the connecting end. The connecting end of all movable covers is limited between the top surface of the internal threaded hole and the annular limiting part.

[0010] The welding nut according to the embodiments of this utility model has at least the following beneficial effects: The welding nut is welded to the part by welding bosses. Before spraying, all movable covers are kept in a closed state covering the internal threaded hole to protect the internal thread of the welding nut from paint contamination. During assembly, the screw is screwed into the internal threaded hole from the bottom of the welding nut. During this process, since the connecting ends of all movable covers are limited between the top surface of the internal threaded hole and the annular limiting part, the connecting ends of the movable covers are fixed, while the open ends of the movable covers are not restricted by any force. Multiple movable covers are gradually opened towards the top surface of the welding nut under the push of the screw to avoid the connection of the screw. When the automotive parts need to be returned to the factory for repair, after the staff removes the screw on the welding nut, they can use a flat hard object to press all the movable covers in the open state towards the bottom surface of the welding nut to restore all the movable covers to the closed state covering the internal threaded hole, thereby avoiding contamination of the internal threaded hole during repainting. Compared with the prior art, this utility model can repeatedly protect the internal thread of the welding nut from paint contamination and is durable.

[0011] According to some embodiments of this utility model, the connecting ends of all movable covers are connected together. When assembling the welding nut, since the connecting ends of all movable covers are connected together, the blocking part can be placed as a whole on the top surface of the internal threaded hole. On this basis, the annular limiting part is placed above the blocking part. Finally, through processing means, the connecting ends of all movable covers are limited between the top surface of the internal threaded hole and the annular limiting part.

[0012] According to some embodiments of this utility model, each of the movable covers has two cuts near the connecting end, and all cuts are distributed radially along the internal threaded hole. The cuts can disperse internal stress when the movable cover is opened, thereby reducing metal fatigue and allowing the movable cover to bend more effectively.

[0013] According to some embodiments of this utility model, a clearance hole is provided at the center of the shielding part. The clearance hole allows for a certain tolerance in the production of the movable cover, so as to prevent interference when multiple movable covers are closed.

[0014] According to some embodiments of this utility model, the shielding part is a spring steel component to enhance its fatigue resistance and meet the requirements for repeated use.

[0015] According to some embodiments of this utility model, the number of movable covers is six to ten, and all movable covers are the same size to facilitate mechanized production.

[0016] According to some embodiments of the present invention, specifically, the annular limiting part is riveted to the top surface of the internal threaded hole; or, the annular limiting part is welded to the top surface of the internal threaded hole.

[0017] According to some embodiments of the present invention, the nut body is a three-dimensional polygon with multiple bottom corners, and each bottom corner is provided with a welding boss to improve the welding performance of the nut.

[0018] According to some embodiments of this utility model, the welding boss is integrally formed with the nut body to enhance the structural strength of the welding nut.

[0019] According to a second aspect embodiment of the present invention, a threaded fastening kit includes:

[0020] The aforementioned welded nuts;

[0021] The screw has external threads, and the screw and the welding nut have a threaded connection.

[0022] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0024] Figure 1 This is a cross-sectional view of the welding nut provided in the embodiment of this utility model in the closed state;

[0025] Figure 2 yes Figure 1 The top view of the welded nut shown;

[0026] Figure 3 This is a three-dimensional structural diagram of the shielding part provided in an embodiment of the present utility model;

[0027] Figure 4 This is a three-dimensional structural diagram of the welding nut provided in the embodiment of this utility model in the open state;

[0028] Figure 5 This is a schematic diagram of the threaded fastening kit provided in an embodiment of the present invention.

[0029] In the attached diagram: 100-nut body, 200-shielding part, 300-welding boss, 110-internal threaded hole, 111-guide slope, 210-movable cover, 220-break line, 211-connecting end, 212-suspended end, 400-annular limiting part, 410-limiting space, 213-cut, 230-avoidance hole, 10-welding nut, 20-screw, 21-external thread. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0031] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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.

[0032] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0033] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0034] like Figure 1 and Figure 2As shown, the welded nut 10 according to a first aspect embodiment of the present invention includes a nut body 100 and a shielding portion 200. The nut body 100 may be a three-dimensional polygon; in this embodiment, the nut body 100 is a three-dimensional rectangle with four bottom corners. Each bottom corner is provided with a welding boss 300, which extends toward the bottom surface of the nut body 100 to support the entire nut body 100. To improve production efficiency and enhance structural strength, the welding boss 300 is integrally formed with the nut body 100. The welded nut 10 is made of a suitable weldable metal material such as carbon steel or stainless steel. Its multiple welding bosses 300 are connected to other parts by resistance welding, allowing the welded nut 10 to be fixedly connected to other parts. Since the nut body 100 is connected to other parts through the welding bosses 300, the side with the welding bosses 300 can be defined as the bottom, and the other side as the top.

[0035] It is understood that the welding nut 10 can also be selected in other shapes, such as a solid pentagon or a solid hexagon. The number of welding bosses 300 can be equal to or different from the number of bottom face corners, but at least two must be provided, and it is not limited to the above embodiment. Of course, if each bottom face corner of the nut body 100 is provided with a welding boss 300, the welding performance of the welding nut 10 can be significantly improved, thereby reducing the risk of the welding nut 10 breaking under impact.

[0036] Furthermore, the nut body 100 has an internal threaded hole 110 at its center. However, this invention does not limit the parameters of the internal threaded hole 110, as long as it can be threadedly connected to the corresponding screw 20. To better achieve the connection, the bottom and top of the internal threaded hole 110 are provided with guide slopes 111. The inclination direction of the guide slopes 111 makes the entry space of the internal threaded hole 110 larger than its thread space, so as to mate with the screw 20.

[0037] like Figures 1 to 3As shown, the top surface of the internally threaded hole 110 is a plane, on which a shielding part 200 is placed. The shielding part 200 includes multiple movable covers 210, the number of which is six to ten. In this embodiment, the number of movable covers 210 can be selected as eight. All movable covers 210 have the same size to facilitate mechanized production. The multiple movable covers 210 are used to cover the internally threaded hole 110. The multiple movable covers 210 are arranged in a circular pattern along the circumference, and each movable cover 210 has a break line 220 between it, so that each movable cover 210 can move independently. Specifically, the movable cover 210 includes a connecting end 211 and an overhead end 212. The size of the movable cover 210 gradually increases from the overhead end 212 to the connecting end 211. In this embodiment, the shape of the movable cover 210 can be selected as a fan shape. To maintain the integrity of the shielding part 200, the connecting ends 211 of all the movable covers 210 are connected together, so that during the production stage, the shielding part 200 can be placed directly on the top surface of the internal threaded hole 110 without having to piece together multiple movable covers 210 piece by piece on the top surface of the internal threaded hole 110, thereby significantly improving production efficiency.

[0038] In order to limit the position of the shielding part 200, firstly, the outer diameter of the shielding part 200 must be greater than the nominal diameter of the internal threaded hole 110. Secondly, an annular limiting part 400 is provided above the shielding part 200. The size of the annular limiting part 400 does not extend to the break line 220 of the shielding part 200. At this time, a limiting space 410 is formed between the top surface of the internal threaded hole 110 and the annular limiting part 400, and the connecting ends 211 of all movable covers 210 are located in the limiting space 410. At this time, the top and bottom surfaces of the shielding part 200 are effectively engaged.

[0039] In this embodiment, the annular limiting part 400 can be a press-fit part. During processing, the blocking part 200 is first placed on the top surface of the internal threaded hole 110 manually or electrically. Then, the annular limiting part 400 is placed above the blocking part 200. Since the dimensions of the blocking part 200 and the annular limiting part 400 are pre-designed, there is no need to position them. Once the blocking part 200 and the annular limiting part 400 are successfully placed, their positions are uniquely determined. Finally, the annular limiting part 400 is pressed firmly using a press-fit machine. During this process, the protruding part of the annular limiting part 400 is flattened and forms a flange that can engage with the blocking part 200. The position of the blocking part 200 is fixed under the pressure of the press-fit machine.

[0040] In some other embodiments, the annular limiting part 400 may also be a welded component, which is welded above the blocking part 200 by a welding process to fix the position of the blocking part 200. This utility model does not limit the specific processing method of the annular limiting part 400. As long as the annular limiting part 400 can fix the position of the blocking part 200, regardless of the processing method used, it falls within the protection scope of this utility model.

[0041] Using the above structure, the welding nut 10 is welded to the component via the welding boss 300. Before painting, all movable covers 210 remain closed, covering the internal threaded hole 110, to protect the internal thread of the welding nut 10 from paint contamination. During assembly, the screw 20 is screwed into the internal threaded hole 110 from the bottom of the welding nut 10. During this process, since the connecting ends 211 of all movable covers 210 are limited between the top surface of the internal threaded hole 110 and the annular limiting part 400, the connecting ends 211 of the movable covers 210 are fixed, while the suspended ends 212 of the movable covers 210 are not restricted by any force. Multiple movable covers 210 gradually bend towards the top surface of the welding nut 10 and are in an open state under the push of the screw 20 to avoid the connection of the screw 20. (See also...) Figure 4 .

[0042] When automotive parts need to be returned to the factory for repair, after the workers remove the screws 20 on the welding nut 10, they can use a flat hard object to press all the movable covers 210 that are in the open position toward the bottom surface of the welding nut 10, so that all the movable covers 210 return to the closed state covering the internal threaded hole 110, thereby preventing the internal threaded hole 110 from being contaminated during the repainting process.

[0043] It should be further explained that, since the movable cover 210 needs to be bent back and forth between the closed and open states, if it were made of ordinary steel, it would be very easy to break due to metal fatigue during the bending process. In order to enhance fatigue resistance and meet the requirements of repeated use, the shielding part 200 can be selected as a spring steel component. It is made of spring steel material, which has good toughness and fatigue resistance, so that it can not break after repeated bending.

[0044] like Figure 3 As shown, each movable cover 210 further includes two notches 213 near the connecting end 211. All notches 213 are distributed radially along the internal threaded hole 110, and the length of each notch 213 does not exceed one-fifth of the length of the movable cover 210. The notches 213 can disperse internal stress when the movable cover 210 is opened, thereby further reducing metal fatigue and allowing the movable cover 210 to bend more effectively.

[0045] In some embodiments of this utility model, a clearance hole 230 is provided at the center of the shielding part 200, meaning that the suspended end 212 of each movable cover 210 does not extend to the central axis of the internal threaded hole 110. The clearance hole 230 allows for a certain tolerance in the production of the movable cover 210, preventing interference when multiple movable covers 210 are closed, thus ensuring coverage of the internal threaded hole 110. During spraying, although some paint can enter the internal threaded hole 110 through the clearance hole 230, because the clearance hole 230 is located at the center of the shielding part 200, even if the paint enters the internal threaded hole 110, it will not adhere to the internal threads. Furthermore, the clearance hole 230 is relatively small, resulting in a very small amount of paint entering.

[0046] like Figure 5 As shown, the threaded fastening kit according to the second aspect embodiment of the present invention includes a welded nut 10 according to the first aspect embodiment of the present invention, and also includes a screw 20. The screw 20 is provided with external threads 21, and the external threads 21 of the screw 20 have a threaded connection relationship with the internal threaded hole 110 of the welded nut 10 to satisfy the threaded connection between the two.

[0047] Since the threaded fastening kit adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0048] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. Welding nut, characterized in that include: The nut body (100) has an internal threaded hole (110), and the top surface of the internal threaded hole (110) is connected to an annular limiting part (400). Welding bosses (300) are provided in multiple forms, and all of the welding bosses (300) are provided on the bottom surface of the nut body (100); The shielding part (200) is a spring steel component. The shielding part (200) is provided with a plurality of movable covers (210). The plurality of movable covers (210) are used to cover the internal threaded hole (110). Each movable cover (210) includes a connecting end (211) and an overhead end (212). The size of the movable cover (210) gradually increases from the overhead end (212) to the connecting end (211). The connecting ends (211) of all movable covers (210) are limited between the top surface of the internal threaded hole (110) and the annular limiting part (400). The connecting ends (211) of all movable covers (210) are connected together. Each movable cover (210) is provided with two cuts (213) near the connecting end (211). All cuts (213) are distributed radially along the internal threaded hole (110).

2. The welded nut of claim 1, wherein: An avoidance hole (230) is reserved at the center of the shielding part (200).

3. The welded nut of claim 1, wherein: The number of movable covers (210) is six to ten, and all movable covers (210) are the same size.

4. The welded nut of claim 1, wherein: The annular limiting part (400) is riveted to the top surface of the internal threaded hole (110); or, the annular limiting part (400) is welded to the top surface of the internal threaded hole (110).

5. The welded nut of claim 1, wherein: The nut body (100) is a three-dimensional polygon, and the nut body (100) has multiple bottom corners, each of which is provided with a welding boss (300).

6. The welded nut according to claim 1 or 5, characterized in that: The welding boss (300) is integrally formed with the nut body (100).

7. Threaded fastening assembly, characterized in that include: The welding nut as described in any one of claims 1 to 6; The screw (20) has external threads (21) and the weld nut (10) are threadedly connected.

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