A guide set screw

Abstract

The utility model discloses a kind of guiding set screws, belong to fastener technical field.The screw includes screw head and screw rod, screw rod is equipped with thread, screw rod end is equipped with conical guide part, the maximum diameter of this guide part is greater than or equal to the large diameter of thread;Smooth cylindrical transition section is equipped between guide part and thread, its diameter is less than or equal to the small diameter of thread;Conical surface of guide part is equipped with one or more tooth surface wedge-shaped tooth towards screw head;Meanwhile, guide part is equipped with one or more slit along axial direction, so that it forms radial elastic petal-like structure.The utility model is combined by guide part and wedge-shaped tooth, realizes fast accurate guidance and anti-vibration locking, and elastic petal-like structure can adapt to hole diameter tolerance, with the advantages of convenient installation, locking reliable, long service life.

Description

Technical Field

[0001] This utility model relates to the field of fastener technology, specifically to a guide set screw for precision mechanical assembly, which is particularly suitable for occasions requiring high-precision positioning and reliable locking. Background Technology

[0002] Set screws are common mechanical fasteners used to secure parts and prevent relative movement. Traditional set screws typically consist of a screw head and a threaded shank, which are screwed into a hole in the part to achieve a fastening effect. However, in practical applications, traditional set screws have the following drawbacks: 1. Difficulty in installation and alignment: Because the end of the screw is a flat or simple conical surface, it lacks an effective guiding structure and is prone to deflection during screwing, resulting in thread damage or improper installation, which has a great impact, especially in high-precision assembly.

[0003] 2. Insufficient locking force: Ordinary set screws rely on the friction between the thread and the hole wall for locking, which is prone to loosening under vibration or alternating loads, resulting in poor reliability.

[0004] 3. Lack of elasticity compensation: Traditional screw structures are rigid and cannot adapt to changes in hole tolerances or slight deformations, which can easily cause stress concentration and reduce service life.

[0005] 4. Difficult to disassemble: If it is over-tightened or rusted, the threads or tools are easily damaged during disassembly, making maintenance and replacement inconvenient.

[0006] While some improvements exist in existing technologies to address the aforementioned issues, such as adding guide cones or grooves, these solutions still suffer from problems like insignificant guiding effect, limited increase in locking force, and complex structure. Therefore, there is an urgent need for a set screw that is simple in structure, provides good guidance, offers reliable locking, and possesses elastic compensation capabilities. Summary of the Invention

[0007] In view of the above-mentioned defects of the prior art, the present invention aims to provide a guide set screw with excellent guiding performance, locking force and elastic adaptability, which can effectively solve the problems of difficult installation, easy loosening and poor adaptability of traditional set screws.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A guide set screw includes a screw head and a screw shank. The screw shank has a thread, and the end of the screw shank has a conical guide portion. The maximum diameter of the guide portion is greater than or equal to the major diameter of the thread. A smooth cylindrical transition section is provided between the guide portion and the thread, and the diameter of the transition section is less than or equal to the minor diameter of the thread. One or more ring-shaped wedge-shaped teeth are provided on the conical surface of the guide portion, and the tooth surfaces of the wedge-shaped teeth are inclined towards the screw head. Furthermore, one or more slits are provided along the axial direction of the guide portion, extending its length, so that the guide portion forms a radially elastic petal-shaped structure.

[0009] Furthermore, the side of the guide portion is provided with at least one axial guide groove.

[0010] Furthermore, the depth of the guide groove gradually decreases from the end of the guide portion toward the transition section until it disappears.

[0011] Furthermore, the slit and the guide groove are offset in the circumferential direction.

[0012] Furthermore, the cross-sectional shape of the guide groove is rectangular, trapezoidal, or arc-shaped.

[0013] Furthermore, the screw head is an internal hex head, a Phillips head, or a slotted head.

[0014] This utility model has the following advantages compared with the prior art: 1. Strong guidance and convenient installation: Through the cooperation of the conical guide part and the guide groove, the screw can automatically center when screwed in, avoiding thread misalignment or damage, which is especially suitable for blind hole or deep hole assembly.

[0015] 2. Reliable locking and vibration resistance: The wedge-shaped tooth structure embeds into the hole wall after tightening, forming a mechanical interlock, which significantly improves the resistance to loosening and is suitable for vibration environments.

[0016] 3. Elastic adaptation and thread protection: The petal-shaped structure of the slit design gives the guide section radial elasticity, which can compensate for hole tolerances and deformation, reduce stress concentration, and extend the life of screws and parts.

[0017] 4. Reasonable structure and simple manufacturing: The transition section smoothly connects the guide part and the thread, reducing stress abrupt changes; the guide groove and the cut are staggered to ensure both guidance and structural strength, resulting in good overall processability and low cost.

[0018] 5. Wide applicability: Different head forms and guide groove shapes can be selected as needed to meet various assembly requirements. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure; Figure 2 Left view; Figure 3 This is a front view.

[0020] In the diagram: 1-Screw head; 2-Screw; 3-Thread; 4-Guide section; 5-Guide groove; 6-Transition section; 7-Wedge tooth; 8-Cut slit. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can fully understand and implement it.

[0022] like Figures 1 to 3 As shown, the guide set screw of this utility model mainly consists of a screw head 1 and a screw 2. The screw head 1 can be in the form of an internal hexagon, Phillips head, or slotted head, etc., to facilitate operation with standard tools. The screw 2 is machined with threads 3 for screwing into the threaded hole of the part.

[0023] The end of the screw 2 is provided with a conical guide 4, the maximum diameter of which is designed to be greater than or equal to the major diameter of the thread 3, so as to ensure that it contacts the hole before the thread when screwing in, thus playing a guiding role. A smooth cylindrical transition section 6 is provided between the guide 4 and the thread 3. The diameter of the transition section 6 is less than or equal to the minor diameter of the thread 3, so as to avoid interference with the thread and at the same time reduce stress concentration by smooth transition.

[0024] The guide portion 4 has one or more rings of evenly distributed wedge-shaped teeth 7 (in this embodiment, there are six evenly distributed wedge-shaped teeth 7 in one ring) machined on its conical surface, with the tooth surfaces inclined towards the screw head 1. When the screw is tightened, the wedge-shaped teeth 7 embed into the hole wall, forming a reverse locking and effectively preventing loosening. One or more through slits 8 are provided along the axial direction of the guide portion 4, dividing the guide portion 4 into several petal-like structures, which have radial elasticity and can adapt to changes in the shape of the hole.

[0025] To further improve guiding and chip removal performance, one or more axial guide grooves 5 are provided on the side of the guide section 4. The depth of the guide groove 5 gradually decreases from the end of the guide section 4 towards the transition section 6, forming a guiding slope to facilitate chip introduction and reduce resistance. The cross-section of the guide groove 5 can be rectangular, trapezoidal, or arc-shaped, depending on the actual needs.

[0026] The slit 8 and the guide groove 5 are staggered in the circumferential direction to improve overall reliability.

[0027] In actual assembly, the guide set screw of this utility model is easy to operate: align the guide part 4 with the hole of the part, press it in gently, and the guide groove 5 and the conical surface will automatically center. During the tightening process, the wedge teeth 7 gradually engage the hole wall, and the slit 8 causes the guide part 4 to slightly shrink to adapt to the hole tolerance, ultimately achieving a firm lock. For disassembly, simply rotate in the opposite direction to remove it; due to the elastic structure, it is not prone to jamming.

[0028] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can make various modifications or improvements to the structure, materials, dimensions, etc. of this utility model without departing from the principles of this utility model, and such modifications or improvements should be considered to fall within the protection scope of this utility model.

Claims

1. A guide set screw, comprising a screw head (1) and a screw shank (2), wherein the screw shank (2) is provided with threads (3), characterized in that: The end of the screw (2) is provided with a conical guide (4), the maximum diameter of the guide (4) is greater than or equal to the major diameter of the thread (3); a smooth cylindrical transition section (6) is provided between the guide (4) and the thread (3), the diameter of the transition section (6) is less than or equal to the minor diameter of the thread (3); one or more rings of wedge-shaped teeth (7) are provided on the conical surface of the guide (4), the tooth surface of the wedge-shaped teeth (7) is inclined toward the screw head (1); and one or more slits (8) are provided along the axial direction of the guide (4) to extend its length, so that the guide (4) forms a petal-shaped structure with radial elasticity.

2. The guide set screw according to claim 1, characterized in that: The side of the guide part (4) is also provided with at least one axial guide groove (5).

3. A guide set screw according to claim 2, characterized in that: The depth of the guide groove (5) gradually decreases from the end of the guide section (4) toward the transition section (6) until it disappears.

4. A guide set screw according to claim 2, characterized in that: The slit (8) and the guide groove (5) are offset in the circumferential direction.

5. A guide set screw according to claim 2, characterized in that: The cross-sectional shape of the guide groove (5) is rectangular, trapezoidal or arc-shaped.

6. A guide set screw according to any one of claims 2 to 5, characterized in that: The screw head (1) is an internal hex head, a cross head, or a slotted head.

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