Bolt anti-loosening structure

Abstract

The utility model discloses a bolt anti-loose structure, which relates to the technical field of bolt fastening, and comprises a bolt, a fastening piece and a locking piece, the bolt is provided with an anti-loose section, a fastening section with a conical surface is arranged in a fixing piece, a support part of the locking piece is provided with a stop surface, and when the bolt and the locking piece are simultaneously mounted in the fastening piece, the locking piece is fixed on the fastening section. The flaps on the fastening section are expanded and abut against the inner wall of the fastening section through the supporting part, the bolt can be prevented from moving in the axial direction of the bolt, and the anti-loosening function is achieved. And meanwhile, the stop surfaces can abut against the side walls, in the circumferential direction of the bolt, of the petals, so that the bolt is prevented from rotating, the anti-loosening function is further achieved, and the connection stability is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to bolt fastening technical field, especially a bolt anti-loose structure. BACKGROUND

[0002] Bolt connection belongs to detachable connection and is widely used in plate fastening, equipment assembly, part connection and other fields. When the equipment is running, mechanical vibration is generated, and long-term mechanical vibration causes the bolt to shake, the pre-tightening force of the bolt connection becomes smaller, thereby causing the fastening effect to become poor, affecting the working performance and stability of the mechanical equipment, especially the machining precision of the precision equipment is seriously affected, and the bolt may be loose or even come off, thereby causing mechanical failure. Therefore, a bolt connection structure capable of effectively preventing loosening is needed to be developed. SUMMARY

[0003] The utility model discloses at least one of the technical problems in the prior art. To this end, the utility model provides a bolt anti-loose structure, which can prevent loosening and improve connection stability.

[0004] According to the bolt anti-loose structure provided in the utility model, the bolt is provided with a threaded segment and an anti-loose segment, the anti-loose segment is located at the end of the threaded segment, and the anti-loose segment has at least two petals.

[0005] The bolt is provided with a threaded segment and an anti-loose segment, the anti-loose segment is located at the end of the threaded segment, and the anti-loose segment has at least two petals.

[0006] The fixing member is provided with a fastening segment, and the fastening segment is provided with an inner wall in the form of a tapered surface.

[0007] The locking member is installed in the fixing member, the supporting portion of the locking member has a plurality of stop surfaces in the circumferential direction, when the locking member and the bolt are installed in the fixing member, the supporting portion can abut against the petals and make the petals expand and press against the inner wall of the fastening segment, and at the same time, the stop surfaces can abut against the side wall of the petals in the circumferential direction of the bolt, thereby avoiding loosening of the bolt.

[0008] According to the bolt anti-loose structure provided in the utility model, at least the following beneficial effects are achieved:

[0009] The embodiment includes a bolt, a fastening member and a locking member, the bolt is provided with an anti-loose segment, the fastening segment in the fixing member is provided with a tapered surface, the supporting portion of the locking member has a stop surface, when the bolt and the locking member are installed in the fastening member at the same time, the petals on the fastening segment are expanded and abut against the inner wall of the fastening segment through the supporting portion, the axial movement of the bolt is avoided, the anti-loose function is realized. At the same time, the stop surfaces can abut against the side wall of the petals in the circumferential direction of the bolt, thereby avoiding rotation of the bolt, further realizing the anti-loose function, and being beneficial to improving the connection stability.

[0010] According to some embodiments of the utility model, first screwing section and second screwing section which are respectively located at both ends of fastening section are arranged in the fixed part, the bolt is screwed in the first screwing section, and the locking part is screwed in the second screwing section.

[0011] According to some embodiments of the utility model, the inner diameter of the end of the fastening section close to the first screwing section is smaller than the inner diameter of the end close to the second screwing section along the axial direction of the fixed part.

[0012] According to some embodiments of the utility model, the outer peripheral wall of the supporting part is provided with a plurality of stop blocks, the stop surface is located on one side of the stop block, there is a gap between the adjacent two petals, and the stop block can be inserted into the gap.

[0013] According to some embodiments of the utility model, the outer peripheral wall of the supporting part is provided with a plurality of stop blocks, and a guide surface is arranged on the side of the stop block away from the stop surface along the circumferential direction of the locking part, and the guide surface is an arc surface.

[0014] According to some embodiments of the utility model, the locking part is provided with a screwing part, and the screwing part is screwed with the second screwing section.

[0015] According to some embodiments of the utility model, the stop surface is located on the side of the stop block in the direction that can be loosened after the stop block rotates towards the locking part along the circumferential direction of the locking part.

[0016] According to some embodiments of the utility model, the supporting part is conical, and the outer diameter of the end of the supporting part close to the anti-loosening section is smaller than the outer diameter of the other end along the axial direction of the locking part.

[0017] According to some embodiments of the utility model, the maximum outer diameter of the screwing part is greater than the maximum outer diameter of the supporting part.

[0018] According to some embodiments of the utility model, the guide surface and the stop surface on the adjacent stop block form a containing cavity, and the petal can be embedded in the containing cavity.

[0019] The additional aspects and advantages of the utility model will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0020] The utility model will be further explained in combination with the drawings and embodiments, wherein:

[0021] Fig. 1 It is the exploded view of a bolt anti-loosening structure in the utility model embodiment;

[0022] Fig. 2 It is the sectional view of the fixed part in the utility model embodiment;

[0023] Fig. 3It is the axial view of the locking piece in the embodiment of the utility model.

[0024] Fig. 4 It is the partial view of the bolt in the embodiment of the utility model.

[0025] Reference signs:

[0026] The fixing piece 100, the fastening segment 101, the first screw segment 102, the second screw segment 103;

[0027] The bolt 110, the threaded segment 111, the anti-loosening segment 112, the petal 113, the gap 114, the plug-in cavity 115;

[0028] The locking piece 120, the support part 121, the stopper 122, the stop face 123, the guide face 124, the containing cavity 125, the screw part 126. DETAILED DESCRIPTION

[0029] The embodiments of the utility model are described in detail below, the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as limiting the utility model.

[0030] In the description of the utility model, it is understood that the orientation description, such as up, down, front, back, left, right and the like, is based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a specific orientation, a specific orientation and operation, therefore, cannot be understood as limiting the utility model.

[0031] In the description of the utility model, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, more than and the like are not included in the number, above, below and the like are included in the number. If the first, the second is described, it is only for distinguishing the technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0032] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection and the like should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.

[0033] Reference Figs. 1 to 4In the bolt anti-loosening structure, the bolt 110, the fastener and the locking piece 120 are combined to fix the mechanical part.

[0034] It can be understood that the bolt 110 is provided with a threaded segment 111 and an anti-loosening segment 112, the outer peripheral wall of the threaded segment 111 is provided with external threads, the anti-loosening segment 112 is located at the end of the threaded segment 111, the anti-loosening segment 112 is provided with at least two petals 113, the plurality of petals 113 are arranged around the circumference of the bolt 110, and an interval is formed between the adjacent two petals 113. At the same time, the petals 113 are arc-shaped, and the petals 113 extend along the circumference of the bolt 110. Therefore, the inner peripheral wall of the plurality of petals 113 surrounds the insertion cavity 115.

[0035] It can be understood that the fixing piece 100 is provided with a fastening segment 101 and a first threaded segment 102 and a second threaded segment 103, the first threaded segment 102 and the second threaded segment 103 are respectively located at the two ends of the fastening segment 101, the threaded segment 111 of the bolt 110 is threadedly connected with the first threaded segment 102, and the installation and fixation of the bolt 110 and the fixing piece 100 are realized. It can be understood that the fastening segment 101 is provided with a tapered inner wall, so that the inner diameter of one end of the fastening segment 101 is large and the inner diameter of the other end is small. In the embodiment, the inner diameter of the end of the fastening segment 101 close to the first threaded segment 102 is smaller than the inner diameter of the other end.

[0036] It can be understood that the locking piece 120 includes a supporting portion 121 and a threaded portion 126, in the embodiment, the locking piece 120 is screwed into the fixing piece 100 through the threaded connection of the threaded portion 126 and the second threaded segment 103. In other embodiments, the locking piece 120 can also be installed in the fixing piece 100 by welding, adhesion or interference fit. It can be understood that the supporting portion 121 is tapered, and the outer diameter of one end of the supporting portion 121 close to the threaded portion 126 is larger than the outer diameter of the other end. Further, the supporting portion 121 is provided with a plurality of stop faces 123 around the circumference, when the locking piece 120 and the bolt 110 are installed in the fixing piece 100, the supporting portion 121 can abut against the petals 113, and the petals 113 are expanded and pressed against the inner wall of the fastening segment 101, at the same time, the stop faces 123 can abut against the side wall of the petals 113 along the circumference of the bolt 110, so as to avoid the loosening of the bolt 110.

[0037] Specifically, the outer circumferential wall of the supporting part 121 is provided with a plurality of protruding stop blocks 122, and along the circumferential direction of the locking piece 120, the two sides of the stop block 122 are respectively provided with a guide surface 124 and a stop surface 123. The stop surface 123 is a plane, and the guide surface 124 is an arc surface. It can be understood that, along the circumferential direction of the locking piece 120, the stop surface 123 is located on the side of the stop block 122 in the direction that can be loosened after rotating towards the locking piece 120, and therefore the guide surface 124 is located on the other side of the stop block 122 in the direction that is tightened towards the locking piece 120. It can be understood that, when the bolt 110 is screwed into the fixed part 100 and the anti-loosening segment 112 is located in the fastening segment 101, the locking piece 120 is screwed into the fixed part 100, the supporting part 121 continuously approaches the anti-loosening segment 112 and is inserted into the insertion cavity 115, and then the outer circumferential wall of the supporting part 121 can abut against the inner circumferential wall of the petal 113 and make the petal 113 expand outward until the outer circumferential wall of the petal 113 abuts against the inner wall of the fastening segment 101, at which time the anti-loosening segment 112 changes from the original cylindrical shape to a trumpet shape, which can avoid the movement of the bolt 110 along the axial direction thereof. Moreover, the supporting part 121 can avoid the inward retraction of the expanded petal 113, that is, even if the bolt 110 rotates in the loosening direction, the petal 113 cannot retract inward due to the limitation of the supporting part 121, so that the bolt 110 is difficult to further rotate in the loosening direction. It can be understood that, in this process, since the petal 113 has been expanded, the gap 114 between the adjacent two petals 113 becomes larger, the stop block 122 can be inserted into the gap 114 between the adjacent two petals 113, so that the stop surface 123 can abut against the side wall of the petal 113 along the circumferential direction of the bolt 110, thereby avoiding the loosening of the bolt 110.

[0038] It can be understood that the guide surface 124 and the stop surface 123 on the adjacent stop block 122 form a containing cavity 125, and at least one petal 113 can be embedded in one containing cavity 125 when the supporting part 121 abuts against the inner circumferential wall of the petal 113. Further, in this embodiment, the locking piece 120 and the threaded segment 111 of the bolt 110 both adopt right-handed threads, that is, the locking piece 120 and the bolt 110 are both screwed into the fixed part 100 in the clockwise direction. Since the stop surface 123 is located on the side of the stop block 122 in the direction that can be loosened after rotating towards the locking piece 120, when the bolt 110 rotates in the loosening direction, the stop surface 123 can limit the rotation of the anti-loosening segment 112, that is, even if the anti-loosening segment 112 can rotate, it will drive the supporting part 121 and the locking piece 120 to rotate in the tightening direction, so that the locking piece 120 cannot be loosened, thereby achieving a stable anti-loosening effect.

[0039] The above describes the embodiments of the utility model in detail in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range possessed by the ordinary skilled in the art without departing from the purpose of the utility model.

Claims

1. A bolt lock structure characterized by comprising: The utility model relates to a bolt, a fixing part and a locking part, and belongs to the technical field of fastening. The bolt is provided with a threaded section and a lockout section, the lockout section is located at the end of the threaded section, and the lockout section has at least two petals. The fixing part is provided with a fastening section, and the fastening section is provided with an inner wall in the form of a tapered surface. The locking part is installed in the fixing part, and the locking part has a support portion with a plurality of stop surfaces along the circumferential direction thereof.

2. The anti-loosening structure of a bolt according to claim 1, wherein When the locking part and the bolt are installed in the fixing part, the support portion can abut against the petals and expand the petals to press against the inner wall of the fastening section.

3. The anti-loosening structure of a bolt according to claim 2, wherein At the same time, the stop surfaces can abut against the side walls of the petals along the circumferential direction of the bolt to prevent the bolt from loosening.

4. The anti-loosening structure of a bolt according to claim 1, wherein The fixing part is provided with a first threaded section and a second threaded section at the two ends of the fastening section, respectively.

5. The anti-loosening structure of a bolt according to claim 1, wherein The bolt is threaded into the first threaded section, and the locking part is threaded into the second threaded section.

6. The anti-loosening structure of a bolt according to claim 2, wherein In the axial direction of the fixing part, the inner diameter of the fastening section near the end of the first threaded section is smaller than the inner diameter of the fastening section near the end of the second threaded section.

7. The anti -loose bolt structure according to claim 4, wherein The outer peripheral wall of the support portion is provided with a plurality of stop blocks, and the stop surfaces are located on one side of the stop blocks.

8. The anti-loosening structure of a bolt according to claim 1, wherein There is a gap between adjacent two petals, and the stop blocks can be inserted into the gap.

9. The anti -loose bolt structure according to claim 6, wherein The outer peripheral wall of the support portion is provided with a plurality of stop blocks.

10. The anti -loose bolt structure according to claim 5, wherein Along the circumferential direction of the locking part, the side of the stop blocks away from the stop surfaces is provided with a guide surface in the form of an arc. The locking part is provided with a threaded portion, and the threaded portion is threaded with the second threaded section. Along the circumferential direction of the locking part, the stop surfaces are located on one side of the stop blocks in the direction that can be loosened after the locking part is rotated. The support portion is in the form of a tapered surface, and along the axial direction of the locking part, the outer diameter of the support portion near the end of the lockout section is smaller than the outer diameter of the other end of the support portion. The maximum outer diameter of the threaded portion is greater than the maximum outer diameter of the support portion. The guide surface and the stop surfaces on the adjacent stop blocks form a receiving cavity, and the petals can be embedded in the receiving cavity.

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