T-DLPC fastener with guiding function

Abstract

The T-DLPC fastener with the guiding function comprises a head portion and a screw rod, the head portion is arranged at one end of the screw rod, the head portion and the screw rod are integrally arranged, threads are arranged on the outer wall of the screw rod, the threads spirally extend along the axis of the screw rod, guiding teeth are arranged at the ends, away from the head portion, of the threads, the outer diameter of the guiding teeth is smaller than that of the threads, and a guiding portion is arranged at the end, away from the head portion, of the screw rod. When the screw is screwed into a nut or a threaded hole, the guide part extends into the nut or the threaded hole, the screw is screwed, the guide teeth are firstly meshed with threads in the nut or the threaded hole, the screw is continuously screwed, the threads are meshed with the threads in the nut or the threaded hole, and the screw axis is coaxial with the nut or the threaded hole axis under the guide of the guide teeth. The thread deflection is avoided, the meshing interference risk is reduced, the production efficiency is improved, the thread stripping is avoided, and the influence on the connection reliability is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of fasteners, and in particular relates to a T-DLPC fastener with a guiding function. Background Art

[0002] In daily life and industrial manufacturing, screws are essential fasteners, from mechanical products to electronic products, from ships, vehicles, water conservancy projects to chemical experiments, from large screws used in engineering, construction, and bridges to precision screws used in digital products, it can be seen that screws are extensive and convenient. However, while screws bring convenience to human life, there are some problems with the assembly process. For example, the screws often bite the nuts during the assembly process. This is manifested as the thread deflection during the threading stage, which makes it difficult for the screws to be smoothly screwed into the nuts or the matching threaded holes, causing the threads to peel or break, affecting the firmness and reliability of the connection. In applications that require sealing, deflected screws will damage the sealing surface and cause leakage. Deflected threads will also affect the aesthetics of the product. Furthermore, threads that are easily deflected are not suitable for applications in automated production.

[0003] Therefore, the above problems need to be solved urgently. Utility Model Content

[0004] Purpose of the utility model: In order to overcome the above shortcomings, the utility model provides a T-DLPC fastener with a guiding function, which optimizes the thread design, sets a guiding part and a guide thread, guides the thread to be smoothly screwed into a nut or a threaded hole, and avoids the thread from being skewed.

[0005] Technical solution: In order to achieve the above-mentioned purpose, the utility model provides a T-DLPC fastener with a guiding function, including a head and a screw, wherein the head is arranged at one end of the screw, the head and the screw are arranged in an integrated manner, a screw thread is arranged on the outer wall of the screw, the screw thread spirally extends along the axis of the screw, a guide thread is arranged at the end of the screw thread away from the head, the outer diameter of the guide thread is smaller than the outer diameter of the screw thread, and a guide portion is arranged at the end of the screw thread away from the head. When the utility model is screwed into a nut or a threaded hole, the guide portion is extended into the nut or the threaded hole, the screw is turned, the guide thread first meshes with the thread in the nut or the threaded hole, the screw is continued to be turned, the screw thread and the thread in the nut or the threaded hole mesh, and the screw axis is coaxial with the axis of the nut or the threaded hole under the guidance of the guide thread, so as to avoid the deflection of the screw thread, reduce the risk of meshing interference, improve production efficiency, and avoid the peeling of the screw thread, which affects the reliability of the connection.

[0006] Furthermore, in the above-mentioned T-DLPC fastener with a guiding function, the guide teeth include a first guide tooth, a second guide tooth, and a third guide tooth. The first guide tooth is arranged at the end of the screw rod away from the head. The first guide tooth, the second guide tooth, and the third guide tooth are arranged in sequence from the guide portion to the head. The outer diameter of the first guide tooth is smaller than the outer diameter of the second guide tooth, and the outer diameter of the second guide tooth is smaller than the outer diameter of the third guide tooth. The utility model is screwed into a nut or a threaded hole, and the first guide tooth, the second guide tooth, and the third guide tooth are meshed in sequence. During the meshing process, the gap between the first guide tooth, the second guide tooth, the third guide tooth, and the thread gradually decreases, and the axis of the guide screw gradually coincides with the axis of the nut or the threaded hole, ensuring that the screw is smoothly screwed into the nut or the threaded hole.

[0007] Furthermore, in the above-mentioned T-DLPC fastener with guiding function, in order to extend the guiding stroke and make the entire guiding process smoother, the outer diameter of the third guide thread is smaller than the outer diameter of the screw thread.

[0008] Furthermore, in the above-mentioned T-DLPC fastener with a guiding function, in order to ensure that the first guide thread is smoothly screwed into the thread, the starting end of the first guide thread is connected to the guiding portion, and the outer diameter of the first guide thread gradually increases from the starting end.

[0009] Furthermore, in the above-mentioned T-DLPC fastener with a guiding function, the outer diameter of the starting end of the first guide tooth is equal to the outer diameter of the end of the guide portion close to the head.

[0010] Furthermore, in the above-mentioned T-DLPC fastener with a guiding function, in order to facilitate the guiding portion to extend into the threaded hole, the axial cross-section of the guiding portion is tapered.

[0011] Furthermore, in the above-mentioned T-DLPC fastener with guiding function, in order to achieve a rapid guiding effect, the axial cross-section of the guiding portion is at an angle of 90 degrees.

[0012] Furthermore, in the above-mentioned T-DLPC fastener with guiding function, a bearing surface is provided near one end of the screw rod at the head. When the screw is tightened, the bearing surface bears and disperses the pressure transmitted by the connecting member to ensure stable connection.

[0013] Furthermore, in the above-mentioned T-DLPC fastener with a guiding function, a screwing groove is provided at one end of the head away from the screw rod. The screwdriver is inserted into the screwing groove to drive the head to rotate, thereby screwing the screw into the nut or the threaded hole.

[0014] It can be seen from the above technical solution that the utility model has the following beneficial effects: the utility model has a T-DLPC fastener with a guiding function, the guide part guides the screw rod of the screw to extend into the nut or threaded hole, the guide thread guides the screw axis to be coaxial with the nut or threaded hole axis, avoids the deflection of the thread, reduces the risk of meshing interference, improves production efficiency, avoids the peeling of the thread, and affects the reliability of the connection. During the meshing process, the first guide thread, the second guide thread, the third guide thread and the thread gap gradually decrease, and the guide thread axis gradually coincides with the nut or threaded hole axis, ensuring that the screw is smoothly screwed into the nut or threaded hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the T-DLPC fastener with guiding function of the utility model.

[0016] In the figure: 1, head, 11, bearing surface, 12, screw groove, 2, screw rod, 21, guide part, 3, screw thread, 31, guide thread, 311, first guide thread, 312, second guide thread, 313, third guide thread. DETAILED DESCRIPTION

[0017] Example 1

[0018] like Figure 1A T-DLPC fastener with a guiding function is shown, comprising a head 1 and a screw 2, wherein the head 1 is arranged at one end of the screw 2, the head 1 and the screw 2 are arranged in an integral manner, a screw tooth 3 is arranged on the outer wall of the screw 2, the screw tooth 3 spirally extends along the axis of the screw 2, a guide tooth 31 is arranged at the end of the screw tooth 3 away from the head 1, the outer diameter of the guide tooth 31 is smaller than the outer diameter of the screw tooth 3, and a guide portion 21 is arranged at the end of the screw 2 away from the head 1. The guide tooth 31 comprises a first guide tooth 311, a second guide tooth 312, and a third guide tooth 313, the first guide tooth 311 is arranged at the end of the screw 2 away from the head 1, the first guide tooth 311, the second guide tooth 312, and the third guide tooth 313 are arranged in sequence from the guide portion 21 to the head 1, the outer diameter of the first guide tooth 311 is smaller than the outer diameter of the second guide tooth 312, the outer diameter of the second guide tooth 312 is smaller than the outer diameter of the third guide tooth 313, and the outer diameter of the third guide tooth 313 is smaller than the outer diameter of the screw tooth 3. In order to ensure that the first guide tooth 311 is screwed into the thread smoothly, the starting end of the first guide tooth 311 is connected to the guide part 21, and the outer diameter of the first guide tooth 311 gradually increases from the starting end. The outer diameter of the starting end of the first guide tooth 311 is equal to the outer diameter of the end of the guide part 21 close to the head 1. In order to facilitate the guide part 21 to extend into the threaded hole and achieve a quick guiding effect, the axial cross-section of the guide part 21 is conical, and the axial cross-section of the guide part 21 is at a 90-degree angle. A bearing surface 11 is provided at one end of the head 1 close to the screw 2. A screw groove 12 is provided at one end of the head 1 away from the screw 2. When the utility model is screwed into a nut or a threaded hole, the guide part 21 is inserted into the nut or the threaded hole, and the screwdriver is inserted into the screwing groove 12 to drive the head 1 to rotate, and the screw is turned, and the first guide tooth 311, the second guide tooth 312, and the third guide tooth 313 are engaged with the threads in the nut or the threaded hole in turn. During the engagement process, the gap between the first guide tooth 311, the second guide tooth 312, the third guide tooth 313 and the thread gradually decreases, and the axis of the guide screw tooth 3 gradually coincides with the axis of the nut or the threaded hole, and then the screw tooth 3 is engaged with the threads in the nut or the threaded hole.

[0019] Example 2

[0020] Based on Example 1, the meshing clearance between the thread 3 and the nut is as follows:

[0021] 1) M1-M1.4 fit clearance 0.15-0.20mm

[0022] 2) M1.6-M2 fitting clearance 0.2-0.25mm

[0023] 3) M2.5-M4 clearance 0.25-0.30mm

[0024] 4) M5-M24 fitting clearance 0.30-0.40mm

[0025] The dimensions of the screw thread 3 and the first guide thread 311, the second guide thread 312, and the third guide thread 313 are as follows:

[0026] Screw thread Bottom diameter The outer diameter of the first guide tooth The outer diameter of the second guide tooth The outer diameter of the third guide tooth M1.4 1.075-1.142 1.175-1.20 1.201-1.226 1.227-1.25 M1.6 1.22-1.321 1.346-1.374 1.375-1.402 1.403-1.431 M1.8 1.421-1.521 1.546-1.538 1.539-1.566 1.567-1.631 M2.0 1.567-1.679 1.686-1.718 1.719-1.751 1.752-1.781 M2.2 1.713-1.838 1.88-1.913 1.914-1.946 1.947-1.98 M4.0 3.242-3.422 3.48-3.543 3.544-3.606 3.607-3.678 M4.5 3.688-3.878 4.038-4.068 4.069-4.099 4.10-4.128 M5.0 4.134-4.334 4.426-4.476 4.477-5.527 4.528-4.576 M6.0 4.917-5.153 5.394-5.424 5.425-5.455 5.456-5.474 M7.0 5.917-6.153 6.344-6.404 6.405-6.465 6.466-6.524 M8.0 6.647-6.912 7.26-7.32 7.321-7391 7.392-7.472 M10.0 8.376-8.676 9.232-9.312 9.313-9.393 9.394-9.468 M12.0 10.106-10.441 11.201-11.289 11.290-11.388 11.389-11.466 M14.0 11.835+12.21 13.182-13.275 13.276-13.369 13.370-13.462 M16.0 13.835-14.21 15.182-15.275 15.276-15.369 15.370-15.462 M18.0 15.294-15.744 17.073-17.183 17.184-17.295 17.296-17.408 M20.0 17.294-17.744 19.073-19.183 19.184-19.295 19.296-19.408 M22.0 19.294-19.744 21.073-21.183 21.184-21.295 21.296-21.408 M24.0 20.752-21.252 23.027-23.140 23.141-23.271 23.272-23.402

[0027] The above embodiments are exemplary, and their purpose is to illustrate the technical concept and features of the utility model so that people familiar with this field can understand the content of the utility model and implement it accordingly, and they cannot limit the protection scope of the utility model in turn. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A T-DLPC fastener with a guiding function, characterized in that: The invention comprises a head (1) and a screw (2), wherein the head (1) is arranged at one end of the screw (2), the head (1) and the screw (2) are arranged in an integral manner, the outer wall of the screw (2) is provided with a screw thread (3), the screw thread (3) extends spirally along the axis of the screw (2), the end of the screw thread (3) away from the head (1) is provided with a guide thread (31), the outer diameter of the guide thread (31) is smaller than the outer diameter of the screw thread (3), and the end of the screw (2) away from the head (1) is provided with a guide portion (21).

2. The T-DLPC fastener with guiding function according to claim 1, characterized in that: The guide tooth (31) comprises a first guide tooth (311), a second guide tooth (312), and a third guide tooth (313); the first guide tooth (311) is arranged at an end of the screw rod (2) away from the head (1); the first guide tooth (311), the second guide tooth (312), and the third guide tooth (313) are arranged in sequence from the guide portion (21) toward the head (1); the outer diameter of the first guide tooth (311) is smaller than the outer diameter of the second guide tooth (312); and the outer diameter of the second guide tooth (312) is smaller than the outer diameter of the third guide tooth (313).

3. The T-DLPC fastener with guiding function according to claim 2, characterized in that: The outer diameter of the third guide thread (313) is smaller than the outer diameter of the screw thread (3).

4. The T-DLPC fastener with guiding function according to claim 2, characterized in that: The starting end of the first guide tooth (311) is connected to the guide portion (21), and the outer diameter of the first guide tooth (311) gradually increases from the starting end.

5. The T-DLPC fastener with guiding function according to claim 4, characterized in that: The outer diameter of the starting end of the first guide tooth (311) is equal to the outer diameter of an end of the guide portion (21) close to the head (1).

6. The T-DLPC fastener with guiding function according to claim 1, characterized in that: The axial cross section of the guide portion (21) is conical.

7. The T-DLPC fastener with guiding function according to claim 1, characterized in that: An extension line of the axial cross section of the guide portion (21) forms an angle of 90 degrees.

8. The T-DLPC fastener with guiding function according to claim 1, characterized in that: The head (1) is provided with a bearing surface (11) at one end close to the screw rod (2).

9. The T-DLPC fastener with guiding function according to claim 1, characterized in that: A screwing groove (12) is provided at one end of the head (1) away from the screw rod (2).

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