Anti-fatigue bolt
By designing the transition section, bar section and reinforcement ring of the cone structure in the bolt, combining the laser remelting layer and tensile steel column, the problem of existing bolts being prone to break in high-stress areas is solved, and the fatigue resistance of the bolts is significantly improved.
Patent Information
- Application Number
- CN202420765770.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-15
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-04-15
AI Technical Summary
Existing bolts are prone to break when they are used excessively, especially at the right-angle connection between the screw head and the screw, the stress concentration is high, resulting in fatigue fracture.
A fatigue-resistant bolt is designed, including a screw head and a screw. The screw head is composed of a transition section of a hexagonal screw head and a cone structure. The screw is composed of a light rod section and a thread section. A raised over-ring is provided between the light rod section and the transition section, and a reinforcement ring is provided at equal intervals along the length of the light rod section. The screw head and screw are equipped with a through hole filled with tensile steel columns, and the surface is coated with a laser remelting layer.
By smoothing over and increasing the over-ring and reinforcement rings in the tapered shape, the fatigue resistance strength in the stress concentration area is improved, the mechanical strength and fatigue resistance strength of the bolt are enhanced, and the possibility of bolt breakage is reduced.
Smart Images
Figure CN222596512U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fasteners, in particular to an anti-fatigue bolt. Background Art
[0002] Bolts are parts used to fasten two parts. Bolts can be used together with nuts to complete the fastening work, and bolts can also complete the fastening work alone. For example, one part is set with a through hole, and the other part is set with a screw hole corresponding to the through hole. The bolt passes through the through hole and is screwed into the screw hole to complete the fastening of the two parts. The existing bolts have a relatively general anti-fracture performance. In the case of excessive force, the bolts are prone to breakage. Especially at the right-angle connection between the screw head and the screw rod, there is often a high stress concentration here, which is more prone to fatigue fracture. Utility Model Content
[0003] In view of the deficiencies in the background technology, the utility model provides an anti-fatigue bolt.
[0004] The technical solution adopted by the utility model is: an anti-fatigue bolt, comprising a screw head and a screw rod, the screw head is composed of a hexagonal screw head and a transition section of a frustum structure, the screw rod is composed of a polished rod section connected to the transition section and a threaded section connected to the polished rod section, a raised transition ring is provided between the polished rod section and the transition section, a plurality of raised reinforcement rings are provided at equal intervals along the length direction of the polished rod section, and arc-shaped transitions are adopted between the two sides of the reinforcement ring and the polished rod section.
[0005] Furthermore, the cross section of the reinforcement ring is a semicircular structure or a semi-elliptical structure.
[0006] Furthermore, the spacing between the reinforcement rings is 1-3 mm.
[0007] Furthermore, the height of the reinforcement ring is not higher than the outer diameter of the thread at the thread end.
[0008] Furthermore, the hexagonal screw head, transition section, polished rod section and threaded section are an integrally formed structure.
[0009] Furthermore, a plurality of through holes are provided in the screw head and the screw rod, and the through holes are filled with tensile steel columns.
[0010] Furthermore, the surfaces of the transition section and the polished rod section are coated with a laser remelting layer.
[0011] Furthermore, the thickness of the laser remelting layer is 0.5-1 mm.
[0012] The beneficial effects of the utility model are as follows: the utility model adds a transition section and a polished rod section of a frustum structure between the screw head and the screw rod, so that the original right-angle transition between the screw head and the screw rod is changed into a conical smooth transition, and at the same time, a raised transition ring is added between the transition section and the polished rod section, which greatly improves the fatigue strength of the stress concentration area. In addition, a reinforcement ring is added to the polished rod section, which helps to improve the overall mechanical strength and fatigue strength of the bolt and reduce the possibility of bolt breakage.
[0013] In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages.
[0014] The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a structural schematic diagram of the utility model.
[0016] Figure 2 for Figure 1 Enlarged schematic diagram at point A in the middle.
[0017] Figure 3 Schematic diagram of the screw head end.
[0018] Figure 1-3 In: 1. Screw head; 2. Screw rod; 3. Hexagonal screw head; 4. Transition section; 5. Bare rod section; 6. Threaded section; 7. Transition ring; 8. Reinforcement ring; 9. Arc transition; 10. Through hole; 11. Tensile steel column. DETAILED DESCRIPTION
[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0020] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0021] The utility model provides an anti-fatigue bolt.
[0022] In this embodiment, refer to Figure 1-3The anti-fatigue bolt comprises a screw head 1 and a screw rod 2. The screw head 1 is composed of a hexagonal screw head 3 and a transition section 4 of a frustum structure. The screw rod 2 is composed of a polished rod section 5 connected to the transition section and a threaded section 6 connected to the polished rod section. A raised transition ring 7 is provided between the polished rod section and the transition section. A plurality of raised reinforcement rings 8 are provided at equal intervals along the length direction of the polished rod section. An arc-shaped transition 9 is used between the two sides of the reinforcement ring and the polished rod section.
[0023] In the above technical solution, a transition section and a smooth rod section with a frustum structure are added between the screw head and the screw rod, so that the original right-angle transition between the screw head and the screw rod is changed into a conical smooth transition. At the same time, a raised transition ring is added between the transition section and the smooth rod section, which greatly improves the fatigue strength of the stress concentration area. In addition, a reinforcement ring is added to the smooth rod section, which helps to improve the overall mechanical strength and fatigue strength of the bolt and reduce the possibility of bolt breakage.
[0024] In order to ensure the fatigue strength of the bolt, the cross-section of the reinforcement ring is a semicircular structure or a semi-elliptical structure; the spacing between the reinforcement rings is 1-3mm; the height of the reinforcement ring is not higher than the outer diameter of the thread at the thread end; the hexagonal screw head, transition section, bare rod section and thread section are an integrally formed structure.
[0025] Specifically, a plurality of through holes 10 are provided in the screw head and the screw rod, and the through holes are filled with tensile steel columns 11 .
[0026] By filling the through holes of the screw head and the screw rod with tensile steel columns, the axial torsion resistance of the bolt is improved, and the fatigue and fracture resistance of the bolt is improved.
[0027] Specifically, the surfaces of the transition section and the polished rod section are coated with a laser remelting layer; the thickness of the laser remelting layer is 0.5-1 mm.
[0028] In the above technical solution, in order to further improve the fatigue resistance of the bolt stress concentration area, a laser remelting layer is coated on its surface, which can relieve stress and improve the strength of the bolt's fatigue resistance.
[0029] Technical personnel should note: Although the utility model has been described according to the above specific implementation methods, the utility model concept of the utility model is not limited to this utility model. Any modification using the utility model concept will be included in the scope of protection of this patent right.
Claims
1. An anti-fatigue bolt, comprising a screw head and a screw rod, characterized in that: The screw head is composed of a hexagonal screw head and a transition section with a frustum structure, the screw rod is composed of a polished rod section connected to the transition section and a threaded section connected to the polished rod section, a raised transition ring is provided between the polished rod section and the transition section, a plurality of raised reinforcement rings are provided at equal intervals along the length direction of the polished rod section, and an arc-shaped transition is adopted between the two sides of the reinforcement ring and the polished rod section.
2. The anti-fatigue bolt according to claim 1, characterized in that: The cross section of the reinforcement ring is a semicircular structure or a semi-elliptical structure.
3. The anti-fatigue bolt according to claim 1, characterized in that: The spacing between the reinforcement rings is 1-3 mm.
4. The anti-fatigue bolt according to claim 1, characterized in that: The height of the reinforcement ring is not higher than the thread outer diameter of the thread end.
5. The anti-fatigue bolt according to claim 2, characterized in that: The hexagonal screw head, transition section, polished rod section and threaded section are an integrally formed structure.
6. The anti-fatigue bolt according to claim 1, characterized in that: A plurality of through holes are arranged in the screw head and the screw rod, and the through holes are filled with tensile steel columns.
7. The anti-fatigue bolt according to claim 1, characterized in that: The surfaces of the transition section and the polished rod section are coated with a laser remelting layer.
8. The anti-fatigue bolt according to claim 2, characterized in that: The thickness of the laser remelting layer is 0.5-1 mm.