Bolt anti-loosening structure

Abstract

The utility model discloses a bolt anti-loosing structure, which relates to the technical field of bolt fastening and comprises a bolt, a fixing piece and a locking piece, the bolt is provided with a threaded section and an anti-loosing section, the anti-loosing section is provided with at least two petals, the fixing piece is provided with a fastening section, the fastening section is provided with an inner wall with a conical surface, and the anti-loosing section is positioned in the fastening section after the bolt is screwed in the fixing piece. The locking piece is detachably connected to the other end, opposite to the bolt, of the fixing piece, the locking piece is provided with a supporting part, and when the locking piece is fixed into the fixing piece, the supporting part can abut against the petals, so that the petals expand in the radial direction of the bolt and make contact with the inner wall of the fastening section in a pressing mode, the bolt is prevented from being disengaged from the fixing piece, and the reliable anti-loosening function is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of bolt fastening, in particular to a bolt anti-loosening structure. Background Art

[0002] A bolt is a fastener consisting of a bolt head and a screw rod. The fastener is used to fasten two mechanical parts with through holes. Bolt connection is a detachable connection and is widely used in the fields of plate fastening, equipment assembly, and parts connection. When the equipment is running, mechanical vibration will occur. Long-term mechanical vibration will cause the bolts to shake, and the preload force of the bolt connection will decrease, resulting in poor fastening effect, affecting the working performance and stability of the mechanical equipment. In particular, the processing accuracy of precision equipment will be seriously affected, and the bolts may loosen or even fall out, causing mechanical failures. Therefore, it is necessary to develop a bolt connection structure that can effectively prevent loosening. Utility Model Content

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

[0004] A bolt anti-loosening structure according to an embodiment of the utility model includes:

[0005] A bolt, comprising a threaded section and an anti-loosening section, wherein the anti-loosening section is located at the end of the threaded section and has at least two petals;

[0006] The fixing piece is provided with a fastening section, the fastening section is provided with an inner wall with a conical surface, and after the bolt is screwed into the fixing piece, the anti-loosening section is located in the fastening section;

[0007] The locking piece is detachably connected to the other end of the fixing piece opposite to the bolt. The locking piece has a supporting portion. When the locking piece is fixed in the fixing piece, the supporting portion can abut against the petal, so that the petal expands along the radial direction of the bolt and presses against the inner wall of the fastening section, thereby preventing the bolt from falling out of the fixing piece.

[0008] A bolt anti-loosening structure according to an embodiment of the utility model has at least the following beneficial effects: this embodiment is provided with a bolt, a fixing member and a locking member, the bolt is provided with a threaded section and an anti-loosening section, the anti-loosening section has at least two petals, the fixing member is provided with a fastening section, the fastening section is provided with an inner wall with a conical surface, after the bolt is screwed into the fixing member, the anti-loosening section is located in the fastening section, the locking member is detachably connected to the other end of the fixing member opposite to the bolt, the locking member has a supporting portion, and when the locking member is fixed in the fixing member, the supporting portion can abut against the petal, so that the petal expands along the radial direction of the bolt and presses against the inner wall of the fastening section, thereby preventing the bolt from falling out of the fixing member and achieving a reliable anti-loosening function.

[0009] According to some embodiments of the utility model, the anti-loosening section has a cavity allowing the support part to be inserted, and at least two petals are provided, with a gap between two adjacent petals.

[0010] According to some embodiments of the utility model, a first rotation section and a second rotation section are respectively disposed at two ends of the fastening section in the fixing member, the bolt is rotationally connected to the first rotation section, and the locking member is rotationally connected to the second rotation section.

[0011] According to some embodiments of the present invention, along the axial direction of the fixing member, the inner diameter of the end of the fastening section close to the first rotational connection section is smaller than the inner diameter of the end of the fastening section close to the second rotational connection section.

[0012] According to some embodiments of the present invention, a transition section is provided between the fastening section and the second rotational connection section, and the minimum inner diameter of the transition section is greater than the maximum outer diameter of the threaded section.

[0013] According to some embodiments of the present utility model, the locking member is provided with a screw-on portion, and the screw-on portion is screw-connected with the second thread segment through a thread.

[0014] According to some embodiments of the present invention, the radial outer side wall of the support portion has a tapered surface, and along the axial direction of the locking member, the inner diameter of the end of the support portion close to the bolt is smaller than the inner diameter of the other end thereof.

[0015] According to some embodiments of the present invention, the maximum outer diameter of the screw-on portion is greater than the maximum outer diameter of the support portion.

[0016] According to some embodiments of the present invention, a limiting platform is provided between the transition section and the second rotational connection section, and after the locking member is rotationally connected to the second rotational connection section, the rotational connection portion abuts against the limiting platform.

[0017] According to some embodiments of the present invention, when the locking member is fixed in the fixing member, the supporting portion is located in the fastening section, and there is a gap between the outer peripheral wall of the supporting portion and the inner wall of the fastening section.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0020] Figure 1 This is an exploded sectional view of a bolt anti-loosening structure in an embodiment of the utility model;

[0021] Figure 2 This is an axonometric view of a bolt in an embodiment of the utility model;

[0022] Figure 3It is a partial cross-sectional view of the installation of bolts, fixing members and locking members in the embodiment of the utility model.

[0023] Reference numerals:

[0024] Bolt 100; threaded section 101; anti-loosening section 102; flap 103; cavity 104;

[0025] Fixing member 110; first rotation section 111; second rotation section 112; fastening section 113; transition section 114; limiting platform 115;

[0026] The locking member 120 , the supporting portion 121 , and the screw-connecting portion 122 . DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0031] In the related art, a bolt is a fastener consisting of a bolt head and a screw rod. The fastener is used to fasten and connect two mechanical parts with through holes. Bolt connection is a detachable connection and is widely used in the fields of plate fastening, equipment assembly, and parts connection. When the equipment is running, mechanical vibration will be generated. Long-term mechanical vibration will cause the bolts to shake, and the pre-tightening force of the bolt connection will decrease, resulting in poor fastening effect, affecting the working performance and stability of the mechanical equipment. In particular, the processing accuracy of precision equipment will be seriously affected. There is also the possibility that the bolts will loosen or even fall out, causing mechanical failures.

[0032] To solve the above problems, refer to Figure 1 In an embodiment of the utility model, a bolt anti-loosening structure is provided, including a bolt 100, a fixing member 110 and a locking member 120. The bolt 100 is provided with a threaded section 101 and an anti-loosening section 102. It can be understood that the threaded section 101 has an external thread, and the anti-loosening section 102 is located at the end of the threaded section 101 away from the head of the bolt 100. The anti-loosening section 102 has at least two petals 103, referring to Figure 2 There is a gap between two adjacent petals 103, the petals 103 are arc-shaped, and at least two petals 103 are arranged at equal intervals around the axial direction of the bolt 100, and there is a cavity 104 in the anti-loosening section 102. It can be understood that along the radial direction of the anti-loosening section 102, at least two petals 103 are located on the periphery of the cavity 104.

[0033] The fixing member 110 is provided with a fastening section 113, and the fastening section 113 is provided with an inner wall with a conical surface. After the bolt 100 is screwed into the fixing member 110, the anti-loosening section 102 is located in the fastening section 113. The locking member 120 is detachably connected to the other end of the fixing member 110 opposite to the bolt 100. The locking member 120 has a supporting portion 121. When the locking member 120 is fixed in the fixing member 110, the supporting portion 121 can be inserted into the cavity 104 and abut against the petal 103, so that the petal 103 expands along the radial direction of the bolt 100 and presses against the inner wall of the fastening section 113, thereby preventing the bolt 100 from coming out of the fixing member 110 and achieving a reliable anti-loosening function.

[0034] It is understandable that the detachable connection between the locking member 120 and the fixing member 110 includes threaded connection, welding, connection by pins, etc., which can achieve fixed connection between the two. It should be noted that the locking member 120 can be integrally formed in the fixing member 110, but the tapered inner wall of the fastening section 113 will be difficult to process, the processing cost is high, and the processing efficiency is insufficient. Therefore, the locking member 120 and the fixing member 110 are separated, which is conducive to simplifying the processing steps and improving the processing efficiency.

[0035] It is understandable that, referring to Figure 3In the embodiment of the present application, preferably, the locking member 120 and the fixing member 110 are connected by threads, and the fixing member 110 is provided with a first screw-on section 111 and a second screw-on section 112 located at both ends of the fastening section 113, respectively. The inner walls of the first screw-on section 111 and the second screw-on section 112 are provided with internal threads, the threaded section 101 of the bolt 100 is screwed to the first screw-on section 111, and the locking member 120 is screwed to the second screw-on section 112. The locking member 120 is provided with a screw-on portion 122, and the screw-on portion 122 is located at one end of the support portion 121, and the screw-on portion 122 is screwed to the second threaded section 101. Further, along the axial direction of the fixing member 110, the inner diameter of the end of the fastening section 113 close to the first screw-on section 111 is smaller than the inner diameter of the end close to the second screw-on section 112. Furthermore, the radial outer side wall of the support portion 121 has a tapered surface, and along the axial direction of the locking member 120 , the inner diameter of the end of the support portion 121 close to the bolt 100 is smaller than the inner diameter of the other end thereof.

[0036] It can be understood that when the locking member 120 and the bolt 100 are respectively screwed on the two ends of the fixing member 110, the support portion 121 of the locking member 120 abuts against the end of the anti-loosening section 102, and as the locking member 120 continues to penetrate into the second screw-on section 112, the support portion 121 with a conical surface is inserted into the cavity 104 and abuts against the inner wall of the petal 103 along the radial direction of the bolt 100, so that the petal 103 expands along the radial direction of the bolt 100 and presses against the inner wall of the fastening section 113, so that the bolt 100 is buckled into the fastening section 113 through the expanded petal 103, preventing the bolt 100 from falling out of the fixing member 110 along its axial direction. Furthermore, when the bolt 100 , the fixing member 110 and the locking member 120 are tightened, along the radial direction of the bolt 100 , the outer wall of the support portion 121 presses against the inner wall of the petal 103 , and the outer wall of the petal 103 presses against the inner wall of the tightening section 113 .

[0037] It can be understood that if the bolt 100 becomes loose during the operation of the equipment and rotates relative to the fixing part 110, causing the bolt 100 to move away from the fixing part 110 along its axial direction, the petal 103 has a tendency to shrink toward the axial direction of the bolt 100 under the guidance of the inner wall of the fastening section 113. At this time, the support portion 121 presses the inner wall of the petal 103, making the petal 103 unable to shrink. Therefore, the bolt 100 cannot fall out due to loosening, thereby achieving the anti-loosening effect of the bolt 100.

[0038] Furthermore, a transition section 114 is provided between the fastening section 113 and the second screw-on section 112, and the minimum inner diameter of the transition section 114 is greater than the maximum outer diameter of the threaded section 101. It can be understood that the transition section 114 is a cylindrical inner cavity. When the locking member 120 is screwed into the fixing member 110, the supporting portion is located in the fastening section, and there is a gap between the outer peripheral wall of the supporting portion and the inner wall of the fastening section. This gap constitutes a cavity for accommodating the petal 103, and the transition section 114 can allow space for the petal 103 to move during the locking process, which helps to achieve a smooth locking process.

[0039] Furthermore, the maximum outer diameter of the screw-on portion 122 is greater than the maximum outer diameter of the support portion 121, and the minimum inner diameter of the second screw-on section 112 is greater than the maximum inner diameter of the transition section 114, so that a limit platform 115 is provided between the transition section 114 and the second screw-on section 112. After the locking member 120 is screwed onto the second screw-on section 112, the screw-on portion 122 abuts against the limit platform 115, thereby limiting the locking member 120.

[0040] It can be understood that the maximum outer diameter of the screw-on portion 122 is the maximum outer diameter of an imaginary cylinder tangent to the crest of its external thread, and the maximum outer diameter of the support portion 121 is the maximum diameter of one end connected to the screw-on portion 122. The minimum inner diameter of the second screw-on section 112 is the minimum inner diameter of the home cylinder tangent to the crest of the internal thread in the radial direction.

[0041] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A bolt anti-loosening structure, characterized in that: include: A bolt, comprising a threaded section and an anti-loosening section, wherein the anti-loosening section is located at the end of the threaded section, and the anti-loosening section has at least two petals; The fixing piece is provided with a fastening section, the fastening section is provided with an inner wall with a conical surface, and the anti-loosening section is located in the fastening section after the bolt is screwed into the fixing piece; A locking piece is detachably connected to the other end of the fixing piece opposite to the bolt, and the locking piece has a supporting portion. When the locking piece is fixed in the fixing piece, the supporting portion can abut against the petal, so that the petal expands along the radial direction of the bolt and presses against the inner wall of the fastening section, thereby preventing the bolt from falling out of the fixing piece.

2. A bolt anti-loosening structure according to claim 1, characterized in that: The anti-loosening section has a cavity that allows the support portion to be inserted, and at least two flaps are provided, with a gap between two adjacent flaps.

3. A bolt anti-loosening structure according to claim 1, characterized in that: The fixing member is provided with a first rotation section and a second rotation section respectively located at two ends of the fastening section, the bolt is rotationally connected to the first rotation section, and the locking member is rotationally connected to the second rotation section.

4. A bolt anti-loosening structure according to claim 3, characterized in that: Along the axial direction of the fixing member, the inner diameter of the end of the fastening section close to the first rotational connection section is smaller than the inner diameter of the end of the fastening section close to the second rotational connection section.

5. A bolt anti-loosening structure according to claim 3, characterized in that: A transition section is provided between the fastening section and the second screw-on section, and a minimum inner diameter of the transition section is greater than a maximum outer diameter of the threaded section.

6. A bolt anti-loosening structure according to claim 5, characterized in that: The locking member is provided with a screw-on portion, and the screw-on portion is screw-connected with the second screw-on section by a thread.

7. A bolt anti-loosening structure according to claim 1, characterized in that: The radial outer side wall of the support portion has a tapered surface, and along the axial direction of the locking piece, the inner diameter of the end of the support portion close to the bolt is smaller than the inner diameter of the other end thereof.

8. A bolt anti-loosening structure according to claim 6, characterized in that: The maximum outer diameter of the screw-on portion is greater than the maximum outer diameter of the support portion.

9. A bolt anti-loosening structure according to claim 6, characterized in that: A limiting platform is provided at one end of the transition section away from the bolt, and after the locking member is screwed onto the fixing member, the screw-on portion abuts against the limiting platform.

10. The bolt anti-loosening structure according to claim 1, characterized in that: When the locking member is fixed in the fixing member, the supporting portion is located in the fastening section, and a gap is provided between an outer peripheral wall of the supporting portion and an inner wall of the fastening section.

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