Connecting structure

Abstract

The utility model provides a connecting structure. The connecting structure comprises a limiting flange, a first stud and a second stud, the first stud and the second stud are connected to the two opposite sides of the limiting flange respectively. A first fastening thread is arranged on the first stud; the second stud is provided with a second fastening thread and a self-tapping thread; the second fastening thread is positioned between the limiting flange and the self-tapping thread; and the pitch of the self-tapping thread is equal to that of the second fastening thread. According to the connecting structure, the self-tapping thread on the second stud of the connecting structure can be tapped on the connecting piece to obtain the internal threaded hole, and then the threaded connection between the second stud and the connecting piece is completed through the second fastening thread and the internal threaded hole, so that the assembling procedures are reduced, the assembling cost is reduced, and the torque performance and the reliability are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of tooling accessories, in particular to a connection structure. Background Art

[0002] In the prior art, the mounted parts can be mounted on the castings by means of studs or double-headed studs. The above scheme has the following disadvantages: the welded aluminum studs are only suitable for thin plates, not for connecting castings, and have a high rate of rework; while the ordinary double-headed studs need to be machined on the castings by special machining equipment to obtain threaded holes, and then the double-headed studs are installed on the castings, and then the mounted parts are connected through the other end of the double-headed studs. The above assembly process adds the process of machining threaded holes, which complicates the assembly process and increases the assembly cost. Utility Model Content

[0003] The utility model provides a connection structure for solving the technical problems such as the complicated assembly process between the installed part and the casting in the prior art.

[0004] In view of the above technical problems, an embodiment of the utility model provides a connection structure, including a limiting flange, a first stud and a second stud; the first stud and the second stud are respectively connected to the opposite sides of the limiting flange; the first stud is provided with a first fastening thread; the second stud is provided with a second fastening thread and a self-tapping thread; the second fastening thread is located between the limiting flange and the self-tapping thread; the pitch of the self-tapping thread is equal to the pitch of the second fastening thread.

[0005] Optionally, a chip accumulation groove is provided on the second stud, and the chip accumulation groove is located between the second fastening thread and the limiting flange.

[0006] Optionally, the chip accumulation groove is an annular groove recessed on the second stud and fitted with the limiting flange.

[0007] Optionally, the pitch of the self-tapping thread is 1.0mm-1.5mm, and the length of the self-tapping thread is 3-4 times the pitch.

[0008] Optionally, the length of the second fastening thread is 8mm-15mm.

[0009] Optionally, the first stud comprises a first fastening section with a circular cross-section; and the first fastening thread is arranged on the first fastening section.

[0010] Optionally, the first stud further includes a first guide surface arranged at an end of the first fastening section away from the limiting flange.

[0011] Optionally, the second stud includes a second fastening section connected to the limiting flange, and a self-tapping section connected to the second fastening section; the self-tapping thread is arranged on the self-tapping section; and the second fastening thread is arranged on the second fastening section.

[0012] Optionally, the cross-section of the self-tapping section is triangular, and the cross-section of the second fastening section is circular; on a projection plane perpendicular to the second stud, three vertices of the triangular cross-section of the self-tapping section are all located on the circumference of the circular cross-section of the second fastening section.

[0013] Optionally, the second stud further includes a second guide surface arranged on the self-tapping section away from one end of the second fastening section.

[0014] In the utility model, the connection structure includes a limiting flange, a first stud and a second stud; the first stud and the second stud are respectively connected to the opposite sides of the limiting flange; the first stud is provided with a first fastening thread; the second stud is provided with a second fastening thread and a self-tapping thread; the second fastening thread is located between the limiting flange and the self-tapping thread; the pitch of the self-tapping thread is equal to the pitch of the second fastening thread.

[0015] In the connection structure of the utility model, the first stud is provided with a first fastening thread for connecting to the mounted part, and the second stud is provided with a self-tapping thread and a second fastening thread. In this way, when the second stud of the above-mentioned connection structure needs to be fixedly connected to the connecting part (such as a casting), the self-tapping thread is firstly tapped in the light hole on the connecting part to obtain an internal threaded hole, and then the second fastening thread is threadedly connected to the internal threaded hole obtained by the tapping to fix the second stud on the connecting part. In this way, in the utility model, there is no need to machine the threaded hole on the connecting part by special machining equipment, but only the second stud needs to be continuously rotated and fed into the light hole on the connecting part, and the processing of the internal threaded hole and the fixed connection between the second stud and the internal threaded hole can be completed through this process, which reduces the assembly process, simplifies the assembly process, and reduces the assembly cost.

[0016] At the same time, since the pitch of the self-tapping thread is equal to the pitch of the second fastening thread, the internal thread hole obtained by tapping the self-tapping thread is exactly matched with the second fastening thread, which improves the connection torque performance and reliability between the second stud and the connecting piece and reduces the rework rate. In addition, the connection structure of the utility model has little constraint on the product structure, is suitable for connecting thick-walled castings and other connecting pieces, and has strong versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1It is a structural schematic diagram of a connection structure provided by an embodiment of the utility model;

[0019] Figure 2 It is a three-dimensional structural schematic diagram of a connection structure provided by an embodiment of the utility model;

[0020] Figure 3 It is a schematic diagram of the connection structure between the connection structure, the connecting member and the installed member provided in one embodiment of the utility model.

[0021] The reference numerals in the specification are as follows:

[0022] 1-limiting flange, 2-first stud, 210-first fastening thread, 220-first fastening section, 230-first guide surface, 3-second stud, 310-second fastening thread, 320-self-tapping thread, 330-self-tapping section, 340-second fastening section, 350-second guide surface, 4-chip accumulation groove, 5-connecting piece, 6-machining equipment. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0024] It should be understood that the directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", and "middle" are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation of the present invention.

[0025] like Figures 1 to 3 As shown, an embodiment of the utility model provides a connection structure, including a limiting flange 1, a first stud 2 and a second stud 3; the first stud 2 and the second stud 3 are respectively connected to the opposite sides of the limiting flange 1; the first stud 2 is provided with a first fastening thread 210; the second stud 3 is provided with a second fastening thread 310 and a self-tapping thread 320; the second fastening thread 310 is located between the limiting flange 1 and the self-tapping thread 320; the pitch of the self-tapping thread 320 is equal to the pitch of the second fastening thread 310.

[0026] Among them, the limiting flange 1 is connected between the first stud 2 and the second stud 3, and the first stud 2 is provided with a first fastening thread 210. When the second stud 3 of the above-mentioned connection structure needs to be fixedly connected to the connecting member 5 (such as a casting), the first fastening thread 210 on the first stud 2 can be directly threadedly connected with the assembly threaded hole on the processing head of the machining equipment 6 to complete the assembly between the first stud 2 and the processing head of the machining equipment 6. Since the pitch and length of the first fastening thread 210 can be adapted and set according to the installation threaded hole on the mounted part, so as to finally complete the assembly between the first stud 2 and the mounted part, the assembly threaded hole on the processing head also needs to be adapted and set with the first fastening thread 210.

[0027] It can be understood that after the first stud 2 is assembled onto the processing head of the machining equipment 6, since the second stud 3 is provided with a second fastening thread 310 and a self-tapping thread 320, and the pitch of the self-tapping thread 320 is equal to the pitch of the second fastening thread 310, therefore, after the second stud 3 is aligned with the light hole on the connecting member, the machining equipment 6 drives the connecting structure to rotate and continuously feeds in the axial direction of the light hole. At this time, the self-tapping thread 320 on the second stud 3 is extruded and cut to form an internal threaded hole in the light hole. After that, the machining equipment 6 continues to drive the second stud 3 to feed in the axial direction of the internal threaded hole. At this time, the second stud 3 can be fixedly installed on the connecting member 5 through the threaded connection between the second fastening thread 310 and the internal threaded hole.

[0028] It can be understood that the limiting flange 1 can limit the connection between the first stud 2 and the mounted part and the assembly position between the second stud 3 and the connecting member 5. Specifically, when the first stud 2 needs to be connected to the mounted part, as long as the first stud 2 is continuously screwed into the mounting threaded hole of the mounted part until the limiting flange 1 abuts against the position corresponding to the edge of the mounting threaded hole on the mounted part, it can be confirmed that the first stud 2 has been installed in place on the mounted part; similarly, when the second stud 3 needs to be connected to the connecting member, as long as the second stud 3 is continuously screwed into the light hole of the connecting member 5 (that is, the internal threaded hole subsequently tapped by the self-tapping thread 320) until the limiting flange 1 abuts against the position corresponding to the edge of the light hole on the connected member 5, it can be confirmed that the second stud 3 has been installed in place on the connecting member 5; therefore, the provision of the above-mentioned limiting flange 1 simplifies the installation between the connection structure and the connecting member 5 and the mounted part, ensures the accuracy of the installation position, and avoids installation that is too deep or too shallow. At the same time, the limiting flange 1 can provide a larger force-bearing surface for the connection between the connection structure and the connecting member 5 and the installed member, making the torque transmission more uniform, preventing the connection structure from deforming, and improving the stability and reliability of the connection structure.

[0029] In the above embodiment of the utility model, the first stud 2 is provided with a first fastening thread 210 for connecting to the mounted part, and the second stud 3 is provided with a self-tapping thread 320 and a second fastening thread 310. In this way, when it is necessary to fix the second stud 3 of the above connection structure with the connecting part 5 (such as a casting), firstly, the self-tapping thread 320 is used to tap the light hole on the connecting part 5 to obtain an internal threaded hole, and then the second fastening thread 310 is threadedly connected to the internal threaded hole obtained by the above tapping to fix the second stud 3 on the connecting part 5. In this way, in the utility model, there is no need to machine the threaded hole on the connecting part 5 by special machining equipment, but only needs to continuously rotate and feed the second stud 3 into the light hole on the connecting part 5, so that the machining of the internal threaded hole and the fixed connection between the second stud 3 and the internal threaded hole can be completed through this process, which reduces the assembly process, simplifies the assembly process, and reduces the assembly cost. At the same time, since the pitch of the self-tapping thread 320 is equal to the pitch of the second fastening thread 310, the internal thread hole obtained by tapping the self-tapping thread 320 is exactly matched with the second fastening thread 310, which improves the connection torque performance and reliability between the second stud 310 and the connector 5 and reduces the rework rate. In addition, the connection structure of the utility model has little constraint on the product structure, is suitable for connecting connectors 5 such as castings with thick walls, and has strong versatility.

[0030] In one embodiment, if Figure 1 As shown, a chip groove 4 is provided on the second stud 3, and the chip groove 4 is located between the second fastening thread 310 and the limiting flange 1. It is understandable that the shape and size of the chip groove 4 can be set according to the requirements, such as being set as an annular groove, or a plurality of grooves arranged at intervals along the circumference of the second stud 3. When the self-tapping thread 320 of the second stud 3 is self-tapped in the connector 5, the chip groove 4 arranged between the second fastening thread 310 and the limiting flange 1 can be used to collect the cut chips to prevent the chips from entering the thread gap. Furthermore, when the second fastening thread 310 is threadedly connected to the connector 5, the resistance during the tightening process of the second stud 3 and the connector 5 can be reduced to prevent the second stud 3 from breaking, and it can also prevent the limiting flange 1 and the surface of the connector 5 from being unable to fit due to chips.

[0031] In one embodiment, if Figure 1 As shown, the chip accumulation groove 4 is an annular groove that is recessed and formed on the second stud 3 and fits with the limiting flange 1. It can be understood that the chip accumulation groove 4 is an annular groove that is recessed and designed on the second stud 3 and fits with the limiting flange 1. The annular groove can make full use of the circumferential space of the second stud 3. In this way, the annular grooves are evenly distributed around the second stud 3, and the debris can be evenly collected to avoid debris accumulation.

[0032] In one embodiment, if Figure 1and Figure 2 As shown, the pitch of the self-tapping thread 320 is 1.0mm-1.5mm, and the length of the self-tapping thread 320 is 3-4 times the pitch. Further, the pitch of the self-tapping thread 320 can be 1.0mm, 1.25mm, 1.5mm, etc. It is understandable that the pitch of the self-tapping thread 320 can be set according to demand. In this embodiment, the pitch of the self-tapping thread 320 is set to the above pitch, which is more in line with the connection characteristics between the second stud 3 and the casting, which can help improve the overall strength of the threaded connection between the second stud 3 and the casting, and is also easier to install.

[0033] In one embodiment, if Figure 2 As shown, the length of the second fastening thread 310 is 8mm-15mm. Further, the length of the second fastening thread 310 is 8mm, 11.5mm, and 15mm. It is understandable that the pitch of the second fastening thread 310 is equal to the pitch of the self-tapping thread 320, but the lengths of the second fastening thread 310 and the self-tapping thread 320 can be the same or different, wherein the length of the second fastening thread 310 can be set according to demand, for example, it can be set according to the torque required for the installation of the second stud 3, the thickness of the connector 5, etc. The above-mentioned length setting of the second fastening thread 310 can save manufacturing costs while meeting the threaded connection requirements between the second fastening thread 310 and the internal threaded hole of the connector 5.

[0034] In one embodiment, if Figure 2 As shown, the first stud 2 includes a first fastening section 220 with a circular cross section; the first fastening thread 210 is arranged on the first fastening section 220. It can be understood that the first stud 2 is a cylindrical stud, and the length and pitch of the first fastening thread 210 on the first fastening section 220 can be set according to requirements, specifically, according to the mounting thread hole of the mounted part connected to the first stud 2, so as to meet the connection requirements between the two.

[0035] In one embodiment, if Figure 2 As shown, the first stud 2 also includes a first guide surface 230 provided at one end of the first fastening section 220 away from the limiting flange 1. It is understandable that the first guide surface 230 can be an inclined surface, an arc surface, etc., which is not limited here, as long as the first guide surface 230 can guide the first stud 2 to be smoothly inserted into the mounting threaded hole of the mounted part or the assembly threaded hole on the machining head of the machining equipment 6, the difficulty of operation during the installation process is reduced, making the connection between the first stud 2 and the mounted part (or machining equipment) easier.

[0036] In one embodiment, if Figure 1 and Figure 2As shown, the second stud 3 includes a second fastening section 340 connected to the limiting flange 1, and a self-tapping section 330 connected to the second fastening section 34; the self-tapping thread 320 is arranged on the self-tapping section 330; and the second fastening thread 310 is arranged on the second fastening section 340. It can be understood that the self-tapping thread 320 is arranged on the self-tapping section 330, and the second fastening thread 310 is arranged on the second fastening section 340. The self-tapping section 330 and the second fastening section 340 are connected in sequence to form the second stud 3, the self-tapping section 330 is used to tap the internal thread hole on the connecting member 5, and the second fastening section 340 is used to be threadedly connected with the internal thread hole tapped on the connecting member 5 through the self-tapping thread 320.

[0037] In one embodiment, if Figure 2 As shown, the cross section of the self-tapping section 330 is triangular, and the cross section of the second fastening section 340 is circular; on the projection plane perpendicular to the second stud 3, the three vertices of the triangular cross section of the self-tapping section 330 are all located on the circumference of the circular cross section of the second fastening section 340. It can be understood that the self-tapping section 330 is set as a triangular prism with a triangular cross section, and the second fastening section 340 is set as a cylindrical stud with a circular cross section. At this time, on the projection plane perpendicular to the second stud 3, the three vertices of the triangle of the self-tapping section 330 projected on the projection plane are all located on the circumference of the circle of the second fastening section 340 projected on the projection plane. The above arrangement can make the internal threaded hole obtained by tapping the self-tapping section 330 fit the second fastening thread 310 of the second fastening section 340. In this embodiment, the triangular cross-section of the triangular prism forms a sharp cutting surface, which makes it easier to cut the connector 5 to tap the internal thread hole. The gap between the self-tapping thread 320 on the triangular prism and the connector 5 can also accumulate the chips cut by tapping, thereby preventing the chips from accumulating between the self-tapping thread 320 and the connector 5 and causing cutting obstruction.

[0038] In one embodiment, if Figure 1 and Figure 2 As shown, the second stud 3 further includes a second guide surface 350 disposed on the self-tapping section 330 and away from one end of the second fastening section. It is understandable that the second guide surface 350 can be an inclined surface, an arc surface, etc., which is not limited here, as long as the second guide surface 350 can guide the self-tapping section 330 of the second stud 3 to be smoothly inserted into the light hole of the connecting member 5, the difficulty of operation during the installation process is reduced, and the tapping and installation process of the second stud 3 on the connecting member 5 becomes easier.

[0039] In the above embodiments of the present invention, Figure 3 As shown, the working process of installing the mounted component on the connecting component through the connecting structure is as follows:

[0040] First, the connecting member 5 is pre-fixed on the machine tool by a tool, and the first fastening thread 210 of the first stud 2 of the connecting structure is threadedly connected with the assembly threaded hole of the processing head of the machining equipment 6 to complete the assembly of the connecting structure and the processing head.

[0041] Secondly, the machining equipment 6 drives the connecting structure to feed toward the connecting member 5, and positions the second stud 3 to align with the light hole of the connecting member 5, and makes the second stud 3 perpendicular to the light hole of the connecting member 5. After that, the machining equipment 6 rotates and drives the second stud 3 to rotate, and the self-tapping section 330 of the second stud 3 is fed and moved along the axis of the light hole of the connecting member 5, and the self-tapping thread 320 of the self-tapping section 330 is extruded and cut in the light hole of the connecting member 5 to form an internal threaded hole.

[0042] Again, the machining head of the machining equipment 6 continues to drive the connection structure to rotate and feed along the axis of the light hole of the connecting member 5. At this time, the second fastening thread 310 of the second fastening section 340 is threadedly connected to the tapped internal threaded hole in the connecting member 5, thereby completing the fastening connection between the second stud 3 and the connecting member 5.

[0043] Finally, the machining device 6 is separated from the first stud 2 , and the mounting threaded hole of the mounted component is threadedly connected with the first fastening thread 210 of the first stud 2 , thereby completing the installation between the mounted component and the connecting component 5 .

[0044] The above are only embodiments of the connection structure and tooling of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A connection structure, characterized in that: It includes a limiting flange, a first stud and a second stud; the first stud and the second stud are respectively connected to the opposite sides of the limiting flange; the first stud is provided with a first fastening thread; the second stud is provided with a second fastening thread and a self-tapping thread; the second fastening thread is located between the limiting flange and the self-tapping thread; the pitch of the self-tapping thread is equal to the pitch of the second fastening thread.

2. The connection structure according to claim 1, characterized in that: The second stud is provided with a chip accumulation groove, and the chip accumulation groove is located between the second fastening thread and the limiting flange.

3. The connection structure according to claim 2, characterized in that: The chip accumulation groove is an annular groove which is recessed on the second stud and fits with the limiting flange.

4. The connection structure according to claim 1, characterized in that: The pitch of the self-tapping thread is 1.0mm-1.5mm, and the length of the self-tapping thread is 3-4 times the pitch.

5. The connection structure according to claim 1, characterized in that: The length of the second fastening thread is 8mm-15mm.

6. The connection structure according to claim 1, characterized in that: The first stud comprises a first fastening section with a circular cross section; the first fastening thread is arranged on the first fastening section.

7. The connection structure according to claim 6, characterized in that: The first stud further includes a first guide surface disposed at an end of the first fastening section away from the limiting flange.

8. The connection structure according to claim 1, characterized in that: The second stud comprises a second fastening section connected to the limiting flange, and a self-tapping section connected to the second fastening section; the self-tapping thread is arranged on the self-tapping section; and the second fastening thread is arranged on the second fastening section.

9. The connection structure according to claim 8, characterized in that: The cross section of the self-tapping section is triangular, and the cross section of the second fastening section is circular; On a projection plane perpendicular to the second stud, three vertices of the triangular cross section of the self-tapping section are all located on the circumference of the circular cross section of the second fastening section.

10. The connection structure according to claim 8, characterized in that: The second stud further includes a second guide surface disposed on the self-tapping section and away from one end of the second fastening section.

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