Self-locking bolt assembly

Abstract

A self-locking bolt assembly relates to the field of mechanical parts and comprises a bolt body, a nut and a self-locking pin, and the bolt body comprises a rod body and an end cap which are integrated; the rod body is located on one side of the end cap. An external thread is arranged on the peripheral surface of the rod body, and at least one locking opening is formed in the external thread; the nut is provided with an assembling hole, the hole wall of the assembling hole is provided with an internal thread, the assembling hole is sleeved outside the rod body, and the internal thread is in threaded fit with the external thread; the self-locking pin is inserted into the nut, the self-locking pin and the nut are relatively fixed in the circumferential direction of the nut, and the self-locking pin and the nut are in sliding fit in the axial direction of the nut; a locking protrusion is arranged on the self-locking pin, and when the self-locking pin axially slides relative to the nut, the locking protrusion can be clamped in the locking opening. Through the structural design of the bolt assembly, the combination stability can be improved, looseness caused by vibration or impact or other factors is not likely to happen, and potential safety hazards are reduced.

Description

Technical Field

[0001] This utility model relates to the field of mechanical parts, and more specifically, to a self-locking bolt assembly. Background Technology

[0002] In industrial production, the tightening performance of bolts and nuts is crucial. Especially under vibration or impact conditions, if bolts and nuts cannot remain tight, it may lead to equipment failure and safety hazards.

[0003] In other words, the nut is screwed onto the outside of the bolt, and the two are fixed by the interlocking thread structure. Under conditions such as impact or vibration, the nut and bolt will have relative displacement in the circumferential direction. The nut will rotate in the direction of loosening relative to the bolt, and the nut will loosen and lose its fastening effect, which will pose a safety hazard. Utility Model Content

[0004] The purpose of this invention includes, for example, providing a self-locking bolt assembly that improves the stability of the connection, prevents loosening, and reduces safety hazards.

[0005] The embodiments of this utility model can be implemented as follows:

[0006] In a first aspect, this utility model provides a self-locking bolt assembly, comprising a bolt body, a nut, and a self-locking pin, wherein:

[0007] The bolt body includes an integral rod and an end cap; the rod is located on one side of the end cap; the outer circumferential surface of the rod is provided with an external thread, and the external thread is provided with at least one locking port; the nut is provided with an assembly hole, the wall of the assembly hole is provided with an internal thread, the assembly hole is sleeved on the rod body, and the internal thread is screwed into the external thread.

[0008] The self-locking pin is inserted into the nut, and the self-locking pin and the nut are fixed relative to each other in the circumferential direction of the nut. The self-locking pin and the nut are slidably engaged in the axial direction of the nut. The self-locking pin is provided with a locking protrusion. When the self-locking pin slides relative to the axial direction of the nut, the locking protrusion can be engaged in the locking hole.

[0009] In an optional embodiment, there are multiple locking slots and multiple locking protrusions, and the multiple locking protrusions are used to engage with the multiple locking slots one by one.

[0010] In an optional embodiment, the self-locking bolt assembly further includes a trigger element mounted on the end cap. The trigger element is used to push the self-locking pin to slide axially relative to the nut when the locking protrusion and the locking port are axially aligned, so that the locking protrusion engages with the locking port.

[0011] In an optional embodiment, the self-locking bolt assembly further includes a first elastic element fixed to the end cap and connected to the trigger element to give the trigger element a tendency to move closer to the self-locking pin.

[0012] In an optional embodiment, the first elastic element is configured as a spring.

[0013] In an optional embodiment, the end cap is provided with a first positioning blind hole, the first elastic member is embedded in the first positioning blind hole, and the trigger member is inserted into the first positioning blind hole and slides with the first positioning blind hole in the axial direction of the rod.

[0014] In an optional embodiment, the end of the trigger is configured as an arc-shaped surface, and the end of the trigger is used to contact the self-locking pin.

[0015] In an optional embodiment, the self-locking bolt assembly further includes a second elastic element mounted to the nut and in contact with the self-locking pin to give the self-locking pin a tendency to move toward the end cap.

[0016] In an optional embodiment, a groove is provided on the wall of the assembly hole, the groove extends axially in the assembly hole, the groove cuts off the internal thread, and the self-locking pin is slidably installed in the groove.

[0017] In an optional embodiment, the mounting hole has a first end and a second end in its axial direction, one end of the slide extends to the first end, and the other end of the slide is spaced from the second end to form a groove end wall; a second positioning blind hole is provided on the groove end wall, and the second elastic member passes through the second positioning blind hole; an anti-detachment protrusion is provided on the first end, and the side of the self-locking pin away from the second elastic member contacts the anti-detachment protrusion.

[0018] The beneficial effects of this utility model embodiment include, for example:

[0019] In summary, the self-locking bolt assembly provided in this embodiment, during use, involves a nut and a bolt body screwed together. When the nut is tightened to a predetermined position on the bolt body, the nut and bolt body meet the fitting requirements. The self-locking pin slides axially relative to the nut, and the locking protrusion on the self-locking pin engages with the locking slot on the bolt body. Thus, because the self-locking pin cannot rotate relative to the bolt body, and also cannot rotate relative to the nut, the nut cannot rotate relative to the bolt body, achieving self-locking. Even under vibration or impact conditions, the nut will not rotate relative to the bolt body and will not loosen, ensuring safe and reliable use with minimal safety hazards. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a self-locking bolt assembly according to an embodiment of this application;

[0022] Figure 2 Examples of this application Figure 1 A magnified view of point A in the diagram;

[0023] Figure 3 Examples of this application Figure 1 A magnified view of point B in the diagram;

[0024] Figure 4 For the purposes of this application, the embodiments are as follows: Figure 3 A schematic diagram showing the self-locking pin moving downwards and locking with the bolt body, for reference;

[0025] Figure 5 This is a schematic diagram from a first-view perspective of the self-locking motion process according to an embodiment of this application;

[0026] Figure 6 This is a schematic diagram from a second perspective of the self-locking motion process in an embodiment of this application.

[0027] icon:

[0028] 100- Bolt body; 110- Rod body; 111- External thread; 112- Locking port; 120- End cap; 121- First positioning blind hole; 122- Blocking protrusion; 200- Nut; 201- Assembly hole; 202- Slide groove; 203- Second positioning blind hole; 210- Internal thread; 220- Anti-loosening protrusion; 300- Self-locking pin; 310- Locking protrusion; 320- Stepped surface; 400- Trigger element; 410- Blocking block; 500- First elastic element; 600- Second elastic element. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0033] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0034] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0035] In the prior art, the nut 200 is screwed onto the bolt, and the nut 200 and the bolt are locked together by their threaded structure. If the nut 200 is not subjected to an external force in the circumferential direction, it will not rotate or loosen relative to the bolt. However, due to the diverse application scenarios of the nut 200 and the bolt, under some vibration or impact conditions, the nut 200 has a tendency to rotate relative to the bolt, and there is a possibility that the nut 200 may loosen, posing a safety hazard.

[0036] In view of this, the designers have provided a self-locking bolt assembly that can achieve self-locking, prevents the nut 200 from loosening, and ensures stable and reliable connection with high safety.

[0037] Please refer to Figures 1-6This embodiment provides a self-locking bolt assembly, including a bolt body 100, a nut 200, and a self-locking pin 300, wherein: the bolt body 100 includes an integral shank 110 and an end cap 120; the shank 110 is located on one side of the end cap 120; the outer circumferential surface of the shank 110 is provided with an external thread 111, and the external thread 111 is provided with at least one locking face 112; the nut 200 is provided with an assembly hole 201, and the hole wall of the assembly hole 201 is provided with an internal thread 210 for assembly. Hole 201 is sleeved on the outside of rod body 110, and internal thread 210 and external thread 111 are screwed together; self-locking pin 300 is inserted into nut 200, and self-locking pin 300 and nut 200 are fixed relative to each other in the circumferential direction of nut 200, and self-locking pin 300 and nut 200 are slidably engaged in the axial direction of nut 200; self-locking pin 300 is provided with locking protrusion 310, and when self-locking pin 300 slides axially relative to nut 200, locking protrusion 310 can be engaged in the locking port 112.

[0038] As described above, the self-locking bolt assembly provided in this embodiment is used as follows:

[0039] The nut 200 is screwed into the shank 110 of the bolt body 100. When the nut 200 is tightened to the set position on the shank 110, the nut 200 and the bolt body 100 meet the engagement requirements. The self-locking pin 300 slides axially relative to the nut 200, and the locking protrusion 310 on the self-locking pin 300 engages with the locking lug 112 on the shank 110. Thus, since the self-locking pin 300 cannot rotate relative to the shank 110, and also cannot rotate relative to the nut 200, the nut 200 cannot rotate relative to the bolt body 100, achieving self-locking. Even under vibration or impact conditions, the nut 200 will not rotate relative to the bolt body 100, will not loosen, and is safe and reliable with minimal safety hazards.

[0040] The following embodiments illustrate the detailed structure of the self-locking bolt assembly of this application by way of example.

[0041] Please refer to Figures 1-6In this embodiment, optionally, the self-locking bolt assembly includes a bolt body 100, a nut 200, a self-locking pin 300, a trigger 400, a first elastic element 500, and a second elastic element 600. The nut 200 is screwed into the bolt body 100. The trigger 400 is mounted on the bolt body 100 and is subjected to the elastic force of the first elastic element 500, causing it to tend to move closer to the nut 200. The second elastic element 600 is mounted on the nut 200, and the self-locking pin 300 is also mounted on the nut 200. The second elastic element 600 causes the self-locking pin 300 to tend to move closer to the bolt body 100. In the initial state, the trigger 400 and the self-locking pin 300 are spaced apart and do not interfere with each other. When the nut 200 is tightened onto the bolt body 100, the nut 200, along with the self-locking pin 300, approaches the trigger 400. Due to the elastic force provided by the second elastic element 600, the self-locking pin 300 does not move axially relative to the nut 200, allowing it to smoothly screw into the bolt body 100 along with the nut 200. As the screw-in length increases, the end face of the nut 200 contacts the trigger 400. As the nut 200 continues to rotate, its end face presses against the trigger 400, increasing the compression and elastic force of the first elastic element 500. When the trigger 400 and the self-locking pin 300 are aligned, under the elastic force of the first elastic element 500, the trigger 400 presses against the self-locking pin 300, causing it to move axially and locking the nut 200 to the bolt body 100. At this point, the nut 200 cannot rotate relative to the bolt body 100, achieving self-locking and preventing loosening during use, ensuring safety and reliability.

[0042] Optionally, the bolt body 100 includes an integral shank 110 and an end cap 120. The shank 110 is located on one side of the end cap 120, and the shank 110 and the end cap 120 are coaxially arranged. The shank 110 is a cylinder, and its outer circumferential surface is provided with an external thread 111. The external thread 111 is provided with at least one locking port 112. When there are multiple locking ports 112, the multiple locking ports 112 are arranged sequentially along the axial direction of the shank 110.

[0043] Please refer to Figures 1-2Meanwhile, the inner side of the end cap 120 connected to the rod body 110 is provided with a first positioning blind hole 121. The first positioning blind hole 121 can be a round hole, and a blocking protrusion 122 is provided at the opening of the first positioning blind hole 121. The first elastic element 500 can be a spring, which is inserted into the first positioning blind hole 121. The trigger element 400 can be a cylindrical rod, which is slidably installed in the first positioning blind hole 121, with one end of the trigger element 400 extending out of the first positioning blind hole 121. A blocking block 410 is provided on the outer peripheral surface of the trigger element 400. The blocking block 410 contacts the blocking protrusion 122, preventing the trigger element 400 from disengaging from the opening of the first positioning blind hole 121 under the elastic force of the first elastic element 500. That is, in the initial state, the first elastic element 500 is in a compressed state, and the first elastic element 500 presses the trigger element 400 against the blocking protrusion 122, making the position of the trigger element 400 stable and reliable.

[0044] In addition, the end face of the trigger 400 away from the end cap 120 can be set as an arc-shaped surface. The end face of the trigger 400 away from the end cap 120 is used to contact the end face of the nut 200 near the end cap 120, which can reduce the contact area and reduce the friction.

[0045] Please refer to Figure 1 , Figures 3-6 In this embodiment, optionally, the nut 200 is provided with an assembly hole 201, and the wall of the assembly hole 201 is provided with an internal thread 210. The assembly hole 201 has a first end and a second end in its axial direction. When the nut 200 is screwed into the rod body 110, the first end faces the end cap 120, and correspondingly, the second end is away from the end cap 120. A groove 202 is provided on the end face of the assembly hole 201 corresponding to the first end. The groove 202 extends along the axial direction of the assembly hole 201, and the groove opening of the groove 202 communicates with the assembly hole 201. One end of the groove 202 is located on the end face where the first end is located, and the other end is spaced apart from the end face where the second end is located to form the groove end wall of the groove 202. The cross-section of the groove 202 can be an arc shape. A second positioning blind hole 203 is provided on the groove end wall, and the second positioning blind hole 203 can be a circular hole. The second elastic element 600 can be a spring. The second elastic element 600 is assembled into the second positioning blind hole 203. The self-locking pin 300 is slidably installed in the slide groove 202. The self-locking pin 300 and the nut 200 are fixed relative to each other in the circumferential direction of the assembly hole 201. Due to the design of the slide groove 202, part of the internal thread 210 is cut off, and the missing part of the internal thread 210 can be filled by the self-locking pin 300.

[0046] Meanwhile, the first end is provided with an anti-detachment protrusion 220, which can be located within the slide groove 202, and the end face of the anti-detachment protrusion 220 is flush with the end face of the first end. The side of the self-locking pin 300 is provided with locking protrusions 310, the number of which is equal to the number of locking openings 112 and they correspond one-to-one. The locking protrusions 310 can fill the missing portion of the internal thread 210, and the width of the missing portion of the internal thread 210 can be the same as the width of the locking opening 112. Multiple locking protrusions 310 can be respectively engaged one-to-one within multiple locking openings 112. The end of the self-locking pin 300 away from the second elastic element 600 is provided with a stepped surface 320, which contacts the anti-detachment protrusion 220, restricting the self-locking pin 300 from extending out of the slide groove 202. Furthermore, under the action of the second elastic element 600, when the self-locking pin 300 abuts against the anti-detachment protrusion 220, the end of the self-locking pin 300 is flush with the end face where the first end is located. Through the cooperation of the second elastic element 600 and the anti-detachment protrusion 220 with the self-locking pin 300, the stability of the self-locking pin 300 in the axial direction can be maintained.

[0047] Please combine Figure 3 or Figure 5 It should be noted that after the nut 200 is screwed onto the rod 110, in the initial state, the locking protrusion 310 of the self-locking pin 300 can fill the missing part of the internal thread 210, allowing the internal thread 210 to smoothly engage with the external thread 111. The locking protrusion 310 will not enter the locking port 112 on the external thread 111, and the locking protrusion 310 and the external thread 111 will not interfere. Obviously, the number of locking protrusions 310 is designed as needed, and can fill only a portion of the missing area of ​​the internal thread 210. As the length of the nut 200 screwed into the rod 110 increases, the nut 200 gradually moves closer to the end cap 120, and the self-locking pin 300 on the nut 200 moves closer to the trigger 400 on the end cap 120. Please refer to... Figure 6 As shown in the left-hand diagram, when the end face of the trigger 400 is in contact with the end face of the nut 200, the trigger 400 and the self-locking pin 300 are exactly on the same diameter, that is, the trigger 400 and the self-locking pin 300 are distributed at the two ends of the semicircle. At this time, the nut 200 can continue to rotate in the tightening direction, and the top surface of the nut 200 contacts the lower end face of the trigger 400. Pressing the trigger 400 further compresses the first elastic element 500. Please refer to... Figure 6As shown in the right-hand diagram, during this process, when the nut 200 rotates the self-locking pin 300 180° along the tightening direction, the self-locking pin 300 rotates to a position aligned with the trigger 400. The trigger 400 moves approximately half a thread pitch. Due to the further compression of the first elastic element 500, the elastic force increases. Under the action of the first elastic element 500, the trigger 400 overcomes the elastic force of the second elastic element 600 and presses the self-locking pin 300, causing the self-locking pin 300 to slide approximately half a thread pitch relative to the nut 200. The locking protrusion 310 slides into the locking port 112, preventing the self-locking pin 300 from rotating relative to the rod body 110. Since the self-locking pin 300 itself cannot rotate relative to the nut 200, circumferential locking of the nut 200 and the bolt body 100 is finally achieved. The locking process can be referred to... Figure 3 and Figure 4 ,or Figure 5 During the locking process, the self-locking pin 300 moves downward, and the locking protrusion 310 on the self-locking pin 300 engages with the corresponding locking port 112, thus achieving self-locking.

[0048] It should be noted that in other embodiments, the second elastic element 600 in the second positioning blind hole 203 can be omitted, and the self-locking pin 300 can be supported by the pre-fractured element. That is, in the initial state, the pre-fractured element is installed in the second positioning blind hole 203, and the self-locking pin 300 is in contact with the pre-fractured element, and the self-locking pin 300 will not slide into the second positioning blind hole 203. As the nut 200 is screwed in, when the trigger 400 is pressed by the end face of the nut 200, the first elastic element 500 stores force. As the nut 200 continues to rotate, when the elastic force of the first elastic element 500 is large enough, when the trigger 400 moves to align with the self-locking pin 300, the elastic force of the first elastic element 500 is released, and the trigger 400 presses the self-locking pin 300, thereby breaking the pre-fractured element. The self-locking pin 300 slides a certain distance relative to the nut 200, so that the locking protrusion 310 engages with the locking port 112, thereby locking the nut 200 and the bolt body 100.

[0049] The self-locking bolt assembly provided in this embodiment can automatically lock after the nut 200 is screwed into the bolt body 100. The nut 200 is not easy to rotate relative to the bolt body 100, the connection is firm and reliable, and the safety risk is low.

[0050] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A self-locking bolt assembly, characterized by The self-locking bolt assembly comprises a bolt body (100), a nut (200) and a self-locking pin (300), wherein: the bolt body (100) comprises an integral rod body (110) and an end cap (120); the rod body (110) is located on one side of the end cap (120); an outer periphery of the rod body (110) is provided with an external thread (111), and at least one locking port (112) is arranged on the external thread (111); the nut (200) is provided with an assembly hole (201), an inner thread (210) is arranged on a hole wall of the assembly hole (201), the assembly hole (201) is sleeved on the rod body (110) externally, and the inner thread (210) is screw-connected with the external thread (111); the self-locking pin (300) is inserted into the nut (200), the self-locking pin (300) is relatively fixed with the nut (200) in the circumferential direction of the nut (200), and the self-locking pin (300) is slidably connected with the nut (200) in the axial direction of the nut (200); the self-locking pin (300) is provided with a locking protrusion (310), and when the self-locking pin (300) slides axially relative to the nut (200), the locking protrusion (310) can be clamped into the locking port (112).

2. The self-locking bolt assembly according to claim 1, wherein: the number of the locking ports (112) is multiple, and the number of the locking protrusions (310) is multiple; the multiple locking protrusions (310) are used for being clamped into the multiple locking ports (112) one by one.

3. The self-locking bolt assembly according to claim 1, wherein: the self-locking bolt assembly further comprises a trigger (400), the trigger (400) is installed on the end cap (120), and the trigger (400) is used for pushing the self-locking pin (300) to slide axially relative to the nut (200) when the locking protrusion (310) is axially aligned with the locking port (112), so that the locking protrusion (310) is clamped into the locking port (112).

4. The self-locking bolt assembly according to claim 3, wherein: the self-locking bolt assembly further comprises a first elastic member (500), the first elastic member (500) is fixed on the end cap (120), the first elastic member (500) is connected with the trigger (400), and the first elastic member (500) is used for making the trigger (400) have a movement trend of approaching the self-locking pin (300).

5. The self-locking bolt assembly according to claim 4, wherein: the first elastic member (500) is a spring.

6. The self-locking bolt assembly according to claim 4, wherein: the end cap (120) is provided with a first positioning blind hole (121), the first elastic member (500) is embedded in the first positioning blind hole (121), and the trigger (400) is inserted into the first positioning blind hole (121) and slidably connected with the first positioning blind hole (121) in the axial direction of the rod body (110).

7. The self-locking bolt assembly according to any one of claims 4-6, characterized in that: An end of the trigger (400) is provided with an arc surface, and the end of the trigger (400) is used to contact the self-locking pin (300).

8. The self-locking bolt assembly according to any one of claims 4-6, characterized in that: The self-locking bolt assembly further comprises a second elastic member (600), the second elastic member (600) is installed on the nut (200), and the second elastic member (600) is in contact with the self-locking pin (300) and used to make the self-locking pin (300) have a movement tendency close to the end cap (120).

9. The self-locking bolt assembly according to claim 8, characterized in that: A sliding groove (202) is provided on a hole wall of the assembly hole (201), the sliding groove (202) extends in the axial direction of the assembly hole (201), the sliding groove (202) intercepts the internal thread (210), and the self-locking pin (300) is slidably installed in the sliding groove (202).

10. The self-locking bolt assembly according to claim 9, characterized in that: The assembly hole (201) has a first end and a second end in the axial direction thereof, one end of the sliding groove (202) extends to the first end, the other end of the sliding groove (202) is spaced apart from the second end to form a groove end wall, a second positioning blind hole (203) is provided on the groove end wall, the second elastic member (600) is arranged in the second positioning blind hole (203), the first end is provided with an anti-disengagement protrusion (220), and the side of the self-locking pin (300) away from the second elastic member (600) is in contact with the anti-disengagement protrusion (220).

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