Anti-lost nut structure and connecting assembly
Patent Information
- Application Number
- CN202521100981.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-30
- Publication Date
- 2026-08-18
- Estimated Expiration
- 2035-05-30
AI Technical Summary
[0002]螺栓螺母作为机械设备中经常用到的零部件，当机械设备在运行中常受振动、冲击或周期性载荷（如汽车发动机、机床等），导致螺母与螺栓的螺纹连接产生微小相对位移，逐渐松动脱落，进而导致螺母的丢失，在机械设备内部，如果内部的螺母掉落后，容易掉落至设备的重要运行部件内，影响部件运行，甚至导致部件的损坏，因此螺母掉落会导致许多不良影响
[0026]采用前述技术方案，螺母的第二限位部与管套的上、下限位部卡接，限制螺母向被连接件内侧移动；管套的第三限位部与盖板的第四限位部卡接，限制螺母向外侧移动，形成“内卡+外卡”的双重轴向约束；并且只需将管套穿过被连接件第二通孔，依次卡接盖板和螺母，最后旋紧螺栓即可完成安装，装配时间比传统冲压防丢螺母减少80%，适合自动化生产线或现场快速维修。无需对被连接件进行冲压、焊接等加工，避免损伤工件（如铝合金、塑料等易变形材料），尤其适合精密设备或售后维护场景。
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Abstract
Description
Technical Field
[0001] This application relates to the field of fastener technology, and in particular to an anti-loss nut structure and connection assembly. Background Technology
[0002] Bolts and nuts are frequently used components in mechanical equipment. When the equipment is subjected to vibration, impact, or periodic loads (such as in car engines and machine tools), the threaded connection between the nut and the bolt will experience slight relative displacement, gradually loosening and falling off, leading to the loss of the nut. If a nut falls inside the mechanical equipment, it is easy for it to fall into important operating parts of the equipment, affecting the operation of the parts and even causing damage. Therefore, falling nuts can cause many adverse effects.
[0003] Existing technology, to prevent nuts from falling off or being lost, involves extending the free end of the nut so that it extends into the hole of the fastener. Then, the free end is stamped to expand its diameter outwards until it exceeds the inward-extending lip of the hole, thus preventing loss. However, stamping within the hole significantly increases processing difficulty and can easily damage the fastener, increasing costs. Another method involves installing a chuck along the edge of the hole to hold the nut outside. This method requires the chuck to be fixed at the hole, making it impractical in confined spaces and limiting its versatility. Summary of the Invention
[0004] In order to overcome the shortcomings of the prior art in achieving nut loss prevention, which requires high assembly space and is difficult to operate, this application provides an anti-loss nut structure and connection component, which can achieve direct assembly and anti-loss effect in the assembly space of conventional nuts.
[0005] To achieve the above objectives, this application adopts the following technical solution: an anti-loss nut structure, comprising a bolt, a nut threadedly connected to the bolt, a sleeve engaging with the nut, and a cover plate through which the bolt passes. The sleeve is fitted over the bolt. One end of the nut has a first limiting part, and one end of the sleeve has a second limiting part. The second limiting part cooperates with the first limiting part to prevent the sleeve from detaching from the nut. The cover plate has a first through hole through which the bolt and part of the sleeve pass. The end of the sleeve away from the second limiting part has a third limiting part. A fourth limiting part is provided in the first through hole. The fourth limiting part cooperates with the third limiting part to prevent the sleeve from detaching from the cover plate.
[0006] After adopting the above technical solution, the assembly process of this solution is as follows: one end of the third limiting part of the sleeve is inserted and passes through the first through hole. After the first limiting part and the second limiting part are pressed together, the reverse movement of the sleeve can be restricted. Then, the nut is installed, and the end of the nut with the fourth limiting part is assembled towards the third limiting part, so that the third limiting part can restrict the reverse movement of the fourth limiting part of the nut. At this time, the bolt is passed through the through hole of the connected part and the sleeve and then threadedly connected to the nut to complete the bolt and nut connection. It can be understood that the assembly process can also be that the sleeve is directly fitted on the outside of the bolt, and then the bolt passes through the through hole of the connected part and the cover plate. Then, the nut is directly threadedly connected to the screw until the first limiting part on the nut and the second limiting part on the sleeve are engaged, and then the nut is tightened. This application has the following advantages: Compared with the prior art, which requires stamping or adding clamps inside the hole of the fastener, this structure achieves positioning through the snap-fit between the nut and the sleeve, eliminating the need for complex processing of the hole of the fastener (such as stamping to enlarge the hole or installing clamps), thus avoiding the risk of damage to the fastener due to processing. It is especially suitable for assembly environments with confined space or complex structures (such as inside precision instruments). By standardizing the dimensions of the sleeve and cover plate, it can accommodate nuts of various specifications, eliminating the need to customize clamps and other components for different equipment, reducing assembly difficulty and cost. During assembly, simply pass the sleeve through the first through hole of the cover plate and snap it with the nut. This achieves mutual positioning of the nut, cover plate, and sleeve, preventing nut loss without additional stamping tools or complex operating steps, significantly improving assembly efficiency.
[0007] Furthermore, the second limiting part is a plurality of first claws arranged circumferentially, the ends of the first claws extending radially outward, and the first limiting part is a first groove extending radially inward.
[0008] Using the aforementioned technical solution, since the claws are spaced apart, there is a gap between the two claws, allowing for greater elastic deformation when the claws are installed into the first limiting part. Therefore, based on this feature, the tips of the claws can be extended by a certain amount. Increasing the limiting length of the claw tip increases the contact area with the first limiting part of the nut, effectively improving the axial pull-out resistance and enhancing the nut's anti-loss effect. Furthermore, the claw's deformation capability allows it to absorb vibration energy through elastic deformation during equipment operation, reducing connection loosening caused by rigid collisions. The outwardly bent claw end forms a trumpet-shaped guide structure. When the screw is installed, as it inserts through the sleeve and connects to the nut threadedly, the force exerted on the sleeve by the screw upon entry is in the same direction as the force between the claw and the nut, thus increasing the sleeve's limiting effect on the nut. If the claw needs to detach from the nut, it needs to deform inward. Since the screw fills the space inside the sleeve, the claw cannot deform inward, thus increasing the nut's anti-loss effect and ensuring that the nut does not fall off during screw installation.
[0009] Furthermore, the second limiting part is a plurality of second claws arranged circumferentially, the ends of the second claws extending radially inward, and the first limiting part is a second groove extending radially outward.
[0010] By employing the aforementioned technical solution, when the second claw is subjected to radial force from the cover plate or the like, the engagement between the second claw and the second slot is more secure, enhancing the nut's anti-loss effect. Furthermore, when the nut is subjected to axial tension, the contact area between the claw and the slot is larger and the force is more evenly distributed, thus providing more reliable limiting and effectively preventing the nut from moving axially, further enhancing the nut's anti-loss effect.
[0011] Furthermore, the second limiting part consists of a plurality of circumferentially spaced and alternately arranged first and second claws. The ends of the first claws extend radially outward, and the ends of the second claws extend radially inward. The first limiting part is an annular locking ring located at the end of the nut. The diameter of the circle formed by the second claws is larger than the diameter of the circle formed by the first claws. The locking ring is located between the second claws and the first claws.
[0012] Using the aforementioned technical solution, the end extends radially outward to form an outer limit with the outer side of the annular locking ring of the nut, and the end extends radially inward to lock the inner side of the annular locking ring to form an inner limit. Through the combination of "outwardly expanding claws + inwardly contracting claws + annular locking ring", the nut is firmly locked between the two layers of claws, so that the nut cannot be detached from the sleeve when subjected to radial forces in multiple directions, which significantly improves the anti-loss performance of the nut.
[0013] Furthermore, the first limiting part is a plurality of third claws arranged circumferentially, the ends of the third claws extending radially outward, and the second limiting part is a third groove extending radially inward.
[0014] Using the aforementioned technical solution, the third claw (located in the nut) extends outward, forming a one-way locking structure with the third groove (extending inward) of the sleeve. During assembly, simply align the nut's claw with the sleeve's groove and push it axially to lock it in place, eliminating the need for complex alignment or adjustment steps, thus facilitating nut assembly. The nut (third claw) can be made of metal (such as stainless steel) to ensure strength, while the sleeve (third groove) can be made of engineering plastic (such as nylon) to reduce weight and cost.
[0015] Furthermore, the first limiting part is a plurality of fourth claws arranged circumferentially, the ends of the fourth claws extending radially inward, and the second limiting part is a fourth groove extending radially inward.
[0016] Using the aforementioned technical solution, the fourth claw (located in the nut) extends inward to form a concave engagement with the fourth slot (extending outward) of the sleeve. This structure concentrates the limiting function in the inner space between the nut and the sleeve, without the need for outward expansion, making it particularly suitable for scenarios with limited radial space (such as thin-walled pipes and multi-layer stacked structures).
[0017] Furthermore, the first limiting part includes an upper limiting part and a lower limiting part, and the second limiting part moves axially between the upper limiting part and the lower limiting part.
[0018] Using the aforementioned technical solution, the nut includes a threaded section with internal threads and a limiting section with a second limiting part;
[0019] Upper limit section: Located at the top of the limit section, it restricts the nut from moving downwards;
[0020] Lower limit section: Located at the bottom of the limit section, it restricts the nut from moving upward;
[0021] The second limiting part is sandwiched between the two, so that the nut cannot break away from the upper and lower limits of the first limiting part regardless of whether it is under tension or compression, thus limiting the axial travel. It also has a certain range of axial movement to prevent damage caused by relative axial movement between the two parts. For example, in high-frequency reciprocating motion equipment such as vibrating screens, the nut and the sleeve have high-frequency axial vibration displacement, and they have relative axial movement space, which helps to release the stress between them.
[0022] Furthermore, the nut includes a threaded section with internal threads and a limiting section with a second limiting part. The threaded section and the limiting section are separately provided, and the limiting section is sleeved on the outside of the threaded section and fixedly connected to the threaded section.
[0023] By adopting the aforementioned technical solution and using a split-type structure for the nut, the threaded section can focus on its threaded connection function, with high-precision internal threads, while the limiting section is designed to prevent loss, with a second limiting part (such as an elastic claw or annular boss) on the outside. The material can be flexibly selected (such as PA66 plastic or aluminum alloy), focusing on axial / radial limiting. Both can be fixed by snap-fitting, welding, screws, or press-fitting.
[0024] Furthermore, the end of the threaded section is provided with an outwardly protruding ring, and the limiting section is sleeved and fixed to the outer diameter of the ring.
[0025] A connecting assembly includes the aforementioned anti-loss nut structure and a connected component. The connected component has a second through hole for a sleeve to pass through. The length of the sleeve is greater than the thickness of the cover plate plus the thickness of the connected component. The length of the sleeve is less than or equal to the thickness of the cover plate plus the thickness of the connected component and the thickness of the second limiting portion. The head of the bolt is greater than the second through hole of the connected component.
[0026] Using the aforementioned technical solution, the second limiting part of the nut engages with the upper and lower limiting parts of the sleeve, restricting the nut from moving inward toward the connected part; the third limiting part of the sleeve engages with the fourth limiting part of the cover plate, restricting the nut from moving outward, forming a double axial constraint of "inner clamping + outer clamping"; and installation is completed simply by passing the sleeve through the second through hole of the connected part, sequentially clamping the cover plate and the nut, and finally tightening the bolt. The assembly time is reduced by 80% compared to traditional stamped anti-loss nuts, making it suitable for automated production lines or rapid on-site maintenance. No stamping or welding processing is required for the connected parts, avoiding damage to the workpiece (such as easily deformable materials like aluminum alloys and plastics), making it particularly suitable for precision equipment or after-sales maintenance scenarios. Attached Figure Description
[0027] The following description, in conjunction with the accompanying drawings, further illustrates this application:
[0028] Figure 1 This is a schematic diagram of an anti-loss nut structure according to this application;
[0029] Figure 2 A full sectional view of Embodiment 1 of the anti-lost nut structure;
[0030] Figure 3 A full sectional view of embodiment 2 of the anti-lost nut structure;
[0031] Figure 4 This is a three-dimensional view of the sleeve in Example 3;
[0032] Figure 5 This is a schematic diagram of the split structure of the nut;
[0033] Figure 6 This is a schematic diagram showing the growth of the first and second limiting parts.
[0034] Figure descriptions: 1. Nut; 11. First limiting part; 111. First slot; 112. Second slot; 113. Upper limiting part; 114. Lower limiting part; 12. Threaded section; 13. Limiting section; 14. Ring; 2. Sleeve; 21. Second limiting part; 211. First claw; 212. Second claw; 24. Third limiting part; 3. Cover plate; 31. Fourth limiting part; 32. First through hole; 4. Bolt; 5. Connected part; 51. Second through hole. Detailed Implementation
[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.
[0036] The terms "first," "second," etc. (if present) in the specification and claims of this application are used to distinguish similar objects, not to describe a specific order or sequence. Even if "second" is used before a technical feature for distinction, it does not necessarily imply the presence of "first." It should be understood that in this application, "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. It should be understood that in this application, "multiple" refers to two or more. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, X and / or Y can represent: X alone, X and Y simultaneously, and Y alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "Containing X, Y, and Z," "Containing X, Y, and Z" means that all three X, Y, and Z are included; "Containing X, Y, or Z" means that one of X, Y, and Z is included; "Containing X, Y, and / or Z" means that any one, two, or three of X, Y, and Z are included.
[0037] The technical solutions of this application will be described in detail below with specific embodiments. The following specific embodiments can be combined or substituted with each other according to the actual situation, and the same or similar concepts or processes may not be described again in some embodiments.
[0038] Example 1:
[0039] like Figure 1 As shown, an anti-loss nut structure includes a nut 1, a sleeve 2 that engages with the nut 1, and a cover plate 3 located between the nut 1 and the sleeve 2. The axial movement direction of the nut 1 when tightened is positive, and the axial movement direction of the nut 1 when loosened is negative. The nut 1 has a first limiting part 11, and one end of the sleeve 2 has a second limiting part 21. The second limiting part 21 restricts the reverse movement of the first limiting part 11 when it abuts against the second limiting part 21. The cover plate 3 has a first through hole 32 for the sleeve 2 to partially pass through. The end of the sleeve 2 away from the second limiting part 21 has a radially outwardly extending third limiting part 24. A fourth limiting part 31 is provided within the first through hole 32. The fourth limiting part 31 restricts the reverse movement of the third limiting part 24 when it abuts against the third limiting part 24. Figure 2As shown, this application provides an anti-loss nut structure, including a bolt 4, a nut 1 threadedly connected to the bolt 4, a sleeve 2 snapped into the nut 1, and a cover plate 3 through which the bolt 4 passes. The sleeve 2 is fitted over the bolt 4. One end of the nut 1 is provided with a first limiting part 11, and one end of the sleeve 2 is provided with a second limiting part 21. The second limiting part 21 cooperates with the first limiting part 11 to prevent the sleeve 2 from detaching from the nut 1. The cover plate 3 is provided with a first through hole 32 through which the bolt 4 and part of the sleeve 2 pass. The end of the sleeve 2 away from the second limiting part 21 is provided with a third limiting part 24. A fourth limiting part 31 is provided in the first through hole 32. The fourth limiting part 31 cooperates with the third limiting part 24 to prevent the sleeve 2 from detaching from the cover plate 3.
[0040] After adopting the above technical solution, the assembly process of this solution is as follows: The end of the sleeve 2 with the third limiting part 24 is inserted and passes through the first through hole 32. After the first limiting part 11 and the second limiting part 21 are pressed together, the reverse movement of the sleeve 2 can be restricted. Then, the nut 1 is installed, and the end of the nut 1 with the fourth limiting part 31 is assembled towards the third limiting part 24, so that the third limiting part 24 can restrict the reverse movement of the fourth limiting part 31 of the nut 1. This application has the following advantages: Compared with the prior art, which requires punching or adding claws in the hole of the fastener, this structure achieves the limiting by the snap-fit between the nut 1 and the sleeve 2, without the need for complex processing of the hole of the fastener (such as punching and enlarging the hole or installing claws), avoiding the risk of damage to the fastener caused by processing. It is especially suitable for assembly environments with limited space or complex structures (such as inside precision instruments). By standardizing the dimensions of the sleeve 2 and the cover plate 3, it can accommodate various specifications of nuts 1, eliminating the need to customize claws and other components for different equipment, reducing assembly difficulty and cost. During assembly, simply pass the sleeve 2 through the first through hole 32 of the cover plate 3 and then snap it with the nut 1. This achieves mutual positioning of the nut 1, the cover plate 3, and the sleeve 2. No additional stamping tools or complicated operation steps are required to prevent the nut 1 from being lost, which significantly improves assembly efficiency.
[0041] Furthermore, the second limiting part 21 is a plurality of first claws 211 arranged circumferentially, the ends of the first claws 211 extend radially outward, and the first limiting part 11 is a first groove 111 extending radially inward.
[0042] By employing the aforementioned technical solution, the gap between the two jaws, created by the spaced-out jaws, allows for greater elastic deformation when the jaws are installed into the first limiting part 11. Based on this feature, the tips of the jaws can be extended by a certain amount. This increased jaw tip limiting length increases the contact area with the first limiting part 11 of the nut 1, effectively improving axial pull-out resistance and enhancing the nut 1's anti-loss effect. Furthermore, the jaws' deformation capability allows them to absorb vibration energy through elastic deformation during equipment operation, reducing connection loosening caused by rigid collisions. The outwardly curved end of the claw forms a flared guide structure. When the screw is installed, it is inserted through the sleeve 2 and threaded to the nut 1. The force exerted on the sleeve 2 by the screw when it enters is in the same direction as the force between the claw and the nut 1. This increases the limiting effect of the sleeve 2 on the nut 1. If the claw needs to detach from the nut 1, it needs to deform inward. Since the screw fills the space inside the sleeve 2, the claw cannot deform inward. This increases the anti-loss effect of the nut 1 and ensures that the nut 1 does not fall off when the screw is installed.
[0043] Specifically, the inward extension mentioned above refers to extension toward the axis, while the outward extension refers to extension away from the axis. The same applies to the descriptions mentioned below.
[0044] Understandably, the claws are made of elastically deformable plastic, while the first slot 111 is made of a less deformable metal material; for example... Figure 6 As shown, the length of the sleeve 2 and the length of the first limiting part 11 can be changed to adapt to various thicknesses of the installation environment.
[0045] Furthermore, such as Figure 2 , Figure 3 , Figure 5 as well as Figure 6 As shown, the first limiting part 11 includes an upper limiting part 113 and a lower limiting part 114, and the second limiting part 21 moves axially between the upper limiting part 113 and the lower limiting part 114.
[0046] Using the aforementioned technical solution, the nut 1 includes a threaded section 12 with internal threads and a limiting section 13 with a second limiting part 21;
[0047] Upper limit section 113: Located at the top of the limiting section 13, it restricts the nut 1 from moving downward;
[0048] Lower limit part 114: Located at the bottom end of the limit section 13, it restricts the nut 1 from moving upward;
[0049] Therefore, it can be seen that the first limiting part 11 and the second limiting part 21 are in a clearance fit in the axial direction, with the second limiting part 21 sandwiched between them. Regardless of whether the nut 1 is under tension or compression, it cannot disengage from the upper and lower limits of the first limiting part 11, thus limiting the axial travel. Furthermore, it has a certain range of axial movement to prevent damage caused by relative axial movement between the two parts. For example, in high-frequency reciprocating motion equipment such as vibrating screens, the nut 1 and the sleeve 2 experience high-frequency axial vibration displacement, and their relative axial movement space helps to release the stress between them.
[0050] It is understandable that the first limiting part 11 and the second limiting part 21 can also be an interference fit and a transition fit in the axial direction.
[0051] Furthermore, such as Figure 5 As shown, the nut 1 includes a threaded section 12 with internal threads and a limiting section 13 with a second limiting part 21. The threaded section 12 and the limiting section 13 are separately arranged. The limiting section 13 is sleeved on the outside of the threaded section 12 and fixedly connected to the threaded section 12 (not shown in the figure).
[0052] By adopting the aforementioned technical solution and using a split-type structural design for the nut 1, the threaded section 12 can focus on the threaded connection function, with high-precision internal thread machining, while the limiting section 13 is designed around the anti-loss requirement, with a second limiting part 21 (such as an elastic claw or an annular boss) on the outside. The material can be flexibly selected (such as PA66 plastic or aluminum alloy), focusing on achieving axial / radial limiting. The two can be fixed by snap-fitting, welding, screws, and press-fitting.
[0053] Furthermore, such as Figure 5 As shown, the end of the threaded section 12 is provided with an outwardly protruding ring 14, and the limiting section 13 is sleeved and fixed to the outer diameter of the ring 14.
[0054] Example 2:
[0055] like Figure 3 As shown, the second limiting part 21 is a plurality of second claws 212 arranged circumferentially, the ends of the second claws 212 extending radially inward, and the first limiting part 11 is a second slot 112 extending radially outward.
[0056] By adopting the aforementioned technical solution, when the second claw 212 is subjected to radial force from the cover plate 3, the engagement between the second claw 212 and the second slot 112 becomes more secure, enhancing the anti-loss effect of the nut 1. Furthermore, when the nut 1 is subjected to axial tension, the contact area between the claw and the slot is larger and the force is more evenly distributed, thus providing more reliable limiting and effectively preventing the nut 1 from moving axially, further enhancing the anti-loss effect of the nut 1.
[0057] Specifically, the end of the claw first extends radially inward, and then bends towards the sleeve 2, making the engagement between the claw and the slot more secure.
[0058] Example 3:
[0059] like Figure 4 As shown, the second limiting part 21 consists of a plurality of circumferentially spaced and alternately arranged first claws 211 and second claws 212. The ends of the first claws 211 extend radially outward, and the ends of the second claws 212 extend radially inward. The first limiting part 11 is an annular locking ring (not shown in the figure) provided at the end of the nut 1. The diameter of the circle formed by the second claws 212 is larger than the diameter of the circle formed by the first claws 211. The locking ring is located between the second claws 212 and the first claws 211.
[0060] Using the aforementioned technical solution, the end extends radially outward to form an outer limit with the outer side of the annular locking ring of nut 1, and the end extends radially inward to lock the inner side of the annular locking ring to form an inner limit. Through the combination of "outward expansion claw + inward contraction claw + annular locking ring", nut 1 is firmly locked between the two layers of claws, so that when nut 1 is subjected to radial forces in multiple directions, it cannot be separated from the sleeve 2, which significantly improves the anti-loss performance of nut 1.
[0061] Example 4:
[0062] The first limiting part 11 is a plurality of third claws arranged circumferentially, the ends of the third claws extending radially outward, and the second limiting part 21 is a third groove extending radially inward.
[0063] Using the aforementioned technical solution, the third claw (located in nut 1) extends outward and forms a one-way locking structure with the third slot (extending inward) of sleeve 2. During assembly, simply align the claw of nut 1 with the slot of sleeve 2 and push it in axially to complete the locking, without the need for complex alignment or adjustment steps, which facilitates the assembly of nut 1. Nut 1 (third claw) can be made of metal (such as stainless steel) to ensure strength, while sleeve 2 (third slot) can be made of engineering plastic (such as nylon) to reduce weight and cost.
[0064] Specifically, the inner diameter of the third chuck is greater than or equal to the thread diameter of nut 1, and the outer diameter of the third chuck is less than the outer edge diameter of nut 1.
[0065] Example 5:
[0066] The first limiting part 11 is a plurality of fourth claws arranged circumferentially, the ends of the fourth claws extending radially inward, and the second limiting part 21 is a fourth slot extending radially inward.
[0067] Using the aforementioned technical solution, the fourth claw (located in nut 1) extends inward to form a concave engagement with the fourth slot (extending outward) of sleeve 2. This structure concentrates the limiting function in the inner space of nut 1 and sleeve 2, without the need for outward expansion, making it particularly suitable for scenarios with limited radial space (such as thin-walled pipes and multi-layer stacked structures).
[0068] Example 6:
[0069] A connection component, such as Figure 2 As shown, it includes the above-mentioned anti-loss nut structure and the connected part 5. The connected part 5 is provided with a second through hole 51 for the tube sleeve 2 to pass through. The length of the tube sleeve 2 is greater than the thickness of the cover plate 3 plus the thickness of the connected part 5. The length of the tube sleeve 2 is less than or equal to the thickness of the cover plate 3 plus the thickness of the connected part 5 and the thickness of the second limiting part 21. The head of the bolt 4 is greater than the second through hole 51 of the connected part 5.
[0070] Using the aforementioned technical solution, the second limiting part 21 of the nut 1 engages with the first limiting part 11 of the sleeve 2, preventing the nut 1 from detaching from the cover plate; the third limiting part 24 of the sleeve 2 engages with the fourth limiting part 31 of the cover plate 3, preventing the nut 1 and sleeve 2 from moving outward and detaching from the cover plate, forming a double axial constraint of "inner clamping + outer clamping"; and installation can be completed simply by passing the sleeve 2 through the second through hole 51 of the connected part 5, sequentially clamping the cover plate 3 and the nut 1, and finally tightening the bolt 4. The assembly time is reduced by 80% compared to traditional stamped anti-loss nuts, making it suitable for automated production lines or rapid on-site maintenance. No stamping or welding processing is required for the connected part 5, avoiding damage to the workpiece (such as easily deformable materials like aluminum alloys and plastics), making it particularly suitable for precision equipment or after-sales maintenance scenarios.
[0071] In addition to the preferred embodiments described above, this application has other implementation methods. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection claimed in this application.
Claims
1. A structure for preventing the loss of a nut, characterized in that, The device includes a bolt (4), a nut (1) threaded to the bolt (4), a sleeve (2) snapped into the nut (1), and a cover plate (3) through which the bolt (4) passes. The sleeve (2) is fitted over the bolt (4). One end of the nut (1) is provided with a first limiting part (11), and one end of the sleeve (2) is provided with a second limiting part (21). The second limiting part (21) cooperates with the first limiting part (11) to prevent the sleeve (2) from detaching from the nut (1). The cover plate (3) is provided with a first through hole (32) through which the bolt (4) and the sleeve (2) partially pass. The end of the sleeve (2) away from the second limiting part (21) is provided with a third limiting part (24). The first through hole (32) is provided with a fourth limiting part (31). The fourth limiting part (31) cooperates with the third limiting part (24) to prevent the sleeve (2) from detaching from the cover plate (3).
2. The anti-loss nut structure according to claim 1, characterized in that, The second limiting part (21) is a plurality of first claws (211) arranged circumferentially, the ends of the first claws (211) extend radially outward, and the first limiting part (11) is a first groove (111) extending radially inward.
3. The anti-loss nut structure according to claim 1, characterized in that, The second limiting part (21) is a plurality of second claws (212) arranged circumferentially, the ends of the second claws (212) extend radially inward, and the first limiting part (11) is a second groove (112) extending radially outward.
4. The anti-loss nut structure according to claim 1, characterized in that, The second limiting part (21) consists of a plurality of circumferentially spaced and alternately arranged first claws (211) and second claws (212). The end of the first claw (211) extends radially outward, and the end of the second claw (212) extends radially inward. The first limiting part (11) is an annular locking ring provided at the end of the nut (1). The diameter of the circle formed by the second claws (212) is larger than the diameter of the locking ring, and the diameter of the circle formed by the first claws (211) is smaller than the diameter of the locking ring.
5. The anti-loss nut structure according to claim 1, characterized in that, The first limiting part (11) is a plurality of third claws arranged circumferentially, the ends of the third claws extending radially outward, and the second limiting part (21) is a third groove extending radially inward.
6. The anti-loss nut structure according to claim 1, characterized in that, The first limiting part (11) is a plurality of fourth claws arranged circumferentially, the ends of the fourth claws extending radially inward, and the second limiting part (21) is a fourth slot extending radially inward.
7. The anti-loss nut structure according to claim 1, characterized in that, The first limiting part (11) includes an upper limiting part (113) and a lower limiting part (114), and the second limiting part (21) moves axially between the upper limiting part (113) and the lower limiting part (114).
8. The anti-loss nut structure according to claim 1, characterized in that, The nut (1) includes a threaded section (12) with internal threads and a limiting section (13) with a second limiting part (21). The threaded section (12) and the limiting section (13) are separately arranged. The limiting section (13) is sleeved on the outside of the threaded section (12) and fixedly connected to the threaded section (12).
9. The anti-loss nut structure according to claim 8, characterized in that, The end of the threaded section (12) is provided with an outwardly protruding ring (14), and the limiting section (13) is sleeved and fixed to the outer diameter of the ring (14).
10. A connecting component, characterized in that, The structure includes the anti-loss nut structure as described in claim 1 and the connected part (5), wherein the connected part (5) is provided with a second through hole (51) for the sleeve (2) to pass through, the length of the sleeve (2) is greater than the thickness of the cover plate (3) plus the thickness of the connected part (5), the length of the sleeve (2) is less than or equal to the thickness of the cover plate (3) plus the thickness of the connected part (5) and the thickness of the second limiting part (21), and the head of the bolt (4) is greater than the second through hole (51) of the connected part (5).