An anti-loosening bolt and nut assembly

Abstract

The present invention provides a bolt-nut assembly with anti-loosening function, belonging to the technical field of fasteners, aiming to solve the problem that anti-loosening bolts and nuts are prone to loosen, resulting in the bolt falling off and the fastening function failing. A bolt-nut assembly with anti-loosening function includes: a bolt, the bolt includes a bolt head and a screw rod fixedly connected to the bolt head, an external thread portion is provided on the screw rod, and at least one cutting plane is provided on the screw rod parallel to its axis, a plurality of clamping grooves arranged in an array along the axis direction are provided on the cutting plane, and the plurality of clamping grooves form a clamping portion; a nut, the nut is provided with an internal thread, and the internal thread is in threaded connection with the external thread portion; a clamping mechanism, the clamping mechanism is rotationally connected to the nut along the axis direction of the screw rod, when the bolt and the nut are locked, the clamping mechanism can be clamped in the clamping groove to limit the nut from loosening and coming off.

Description

Technical Field

[0001] The present invention belongs to the technical field of fasteners, and more specifically, particularly relates to a bolt and nut assembly for preventing loosening. Background Art

[0002] There are many types of anti-loosening bolts on the market. The most commonly used one is to use a spring washer to achieve the anti-loosening effect, but the effect is average. There is also a method of applying anaerobic glue to the screw rod, and the effect is very good, but it is not resistant to high temperature and has a certain shelf life. Now there is a nylon ring sleeved on the nut to lock the screw rod during use. There is also a method of mechanical destruction, bending the screw rod of the bolt to achieve anti-loosening, but there is a problem that it is very difficult to remove. There are also some that achieve anti-loosening through the design of the structural angle of gears, and there are also those that achieve anti-loosening through openings such as grooves. The latest one is to add a ring of gears to the nut or gasket to achieve extrusion deformation, thereby realizing the anti-loosening of the bolt and nut.

[0003] For example, the anti-loosening bolt assembly with preset torque control for disassembly with the application number CN201910599749.5 includes a nut, a bolt and a stop washer that cooperate with each other. Among them: the nut is provided with a ratchet structure; the bolt is provided with an axial groove; the stop washer is provided with an elastic ratchet pawl that cooperates with the ratchet structure and a horizontal protrusion that cooperates with the axial groove; the horizontal protrusion is provided with a prefabricated notch. The cooperation method in which the number of ratchets of the ratchet structure differs by 1 from the number of elastic ratchet pawls enables the nut to be engaged and locked with only a very small rotation angle. The advantage of the anti-loosening bolt assembly of this invention is that different prefabricated notches can be set according to different situations, so as to achieve the purpose of preset torque.

[0004] However, the anti-loosening bolt and nut of the prior art are prone to loosening, resulting in the bolt falling off and the fastening function failing.

[0005] Therefore, in view of this, research and improvement are carried out on the existing structure and deficiencies, and a bolt and nut assembly for preventing loosening is provided, with the expectation of achieving a more practical value purpose. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides a bolt and nut assembly for preventing loosening to solve the problem that the anti-loosening bolt and nut are prone to loosening, resulting in the bolt falling off and the fastening function failing.

[0007] The purpose and effect of the bolt and nut assembly for preventing loosening of the present invention are achieved by the following specific technical means:

[0008] A bolt and nut assembly for preventing loosening, comprising:

[0009] A bolt, the bolt includes a bolt head and a screw rod fixedly connected to the bolt head. An external thread portion is provided on the screw rod, and at least one cutting plane is provided on the screw rod parallel to its axis. A plurality of clamping grooves are arranged in an array along the axial direction on the cutting plane, and the plurality of clamping grooves form a clamping portion;

[0010] A nut, the nut is provided with an internal thread, and the internal thread is threadedly connected to the external thread portion;

[0011] A clamping mechanism, the clamping mechanism is rotationally connected to the nut along the axial direction of the screw rod. When the bolt and the nut are locked, the clamping mechanism can be clamped in the clamping groove to limit the nut from loosening and coming off.

[0012] Further, the clamping mechanism includes at least one limiting member, abutting rotating pieces fixedly connected to both ends of the limiting member, and a clamping elastic piece arranged in the limiting member;

[0013] The semi-circular arc region enclosed by the cylindrical surface where the minor diameter of the internal thread is located and the cutting plane, and the clamping mechanism is arranged in this semi-circular arc region;

[0014] The limiting member is provided with a groove along its length direction, and the limiting member is also provided with a through clamping hole. The clamping elastic piece is arranged in the groove;

[0015] The clamping elastic piece is provided with a clamping convex, the clamping convex is arranged in the clamping hole and extends to the clamping groove. The clamping convex can be clamped in the clamping groove, and the clamping convex is provided with an inclined surface facing the bolt head.

[0016] Further, the clamping elastic piece is also provided with a slope surface, the slope surface faces the direction opposite to the bolt head, the included angle between the slope surface and the cutting plane is α, 90° < α < 180°, the limiting member is provided with an insertion hole, the insertion hole can insert a shaft rod, and the shaft rod can abut against the slope surface so that the clamping convex is away from the clamping groove.

[0017] Further, the limiting member and the abutting rotating piece are integrally formed into a frame structure by welding.

[0018] Further, the clamping elastic piece is provided with a flat portion, and the flat portion is welded in the groove.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The technical solution of the present invention can set a clamping structure on the bolt and the nut, so that while the bolt and the nut are locked, the clamping structure is used for limiting, preventing the nut from loosening when being vibrated, making the nut always in a tightened state, and the tightening effect of the bolt and the nut is better. Since an active tightening structure is adopted, the bolt and the nut are not likely to have the phenomenon of tightening failure. Brief Description of the Drawings

[0021] Figure 1 is a perspective structural schematic diagram (first perspective) of a bolt and nut assembly with anti-loosening function according to the present invention.

[0022] Figure 2 is a perspective structural schematic diagram (second perspective) of a bolt and nut assembly with anti-loosening function according to the present invention.

[0023] Figure 3 is an exploded structural schematic diagram of a bolt and nut assembly with anti-loosening function according to the present invention.

[0024] Figure 4 is a front view structural schematic diagram of a bolt and nut assembly with anti-loosening function according to the present invention.

[0025] Figure 5 is Figure 4 a sectional structural schematic diagram of A-A in

[0026] Figure 6 is Figure 5 an enlarged structural schematic diagram at position B in

[0027] In the figure, the corresponding relationship between the component names and the drawing reference numbers is as follows:

[0028] bolt 1, bolt head 11, screw rod 12, clamping portion 121, clamping groove 122, external thread portion 123,

[0029] nut 2, internal thread 21, end groove 22,

[0030] clamping mechanism 3, abutting and rotating piece 31, limiting member 32, groove 321, clamping hole 322, insertion hole 323, clamping elastic piece 33, clamping protrusion 331, inclined surface 332. Detailed Description of the Invention

[0031] The following further describes in detail the embodiments of the present invention in conjunction with the drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0032] In the description of the present invention, unless otherwise specified, "a plurality of" means two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Embodiment

[0035] As shown in the Figure 1 to the Figure 6 accompanying drawings:

[0036] The present invention provides an anti-loosening bolt and nut assembly, including:

[0037] A bolt 1, the bolt 1 includes a bolt head 11 and a screw rod 12 fixedly connected to the bolt head 11. An external thread portion 123 is provided on the screw rod 12, and at least one cutting plane is provided on the screw rod 12 parallel to its axis. A plurality of clamping grooves 122 arranged in an array along the axis direction are provided on the cutting plane, and the plurality of clamping grooves 122 form a clamping portion 121;

[0038] A nut 2, the nut 2 is provided with an internal thread 21, and the internal thread 21 is in threaded connection with the external thread portion 123;

[0039] A clamping mechanism 3, the clamping mechanism 3 is rotatably connected to the nut 2 along the axis direction of the screw rod 12. When the bolt 1 and the nut 2 are locked, the clamping mechanism 3 can be clamped in the clamping groove 122 to limit the nut 2 from loosening and disengaging.

[0040] The clamping mechanism 3 in this embodiment is used to limit the nut 2 from disengaging after being locked on the screw rod 12, and the clamping portion 121 provided on the cutting plane is used to cooperate with the clamping mechanism 3 to limit the nut 2 from loosening and disengaging.

[0041] The clamping mechanism 3 includes at least one limiting member 32, abutting and rotating pieces 31 fixedly connected to both ends of the limiting member 32, and a clamping elastic piece 33 arranged in the limiting member 32;

[0042] The semi-circular arc region formed by the cylindrical surface where the minor diameter of the internal thread 21 is located and the cutting plane, and the clamping mechanism 3 is arranged in this semi-circular arc region;

[0043] The limiting member 32 is provided with a groove 321 along its length direction, and the limiting member 32 is also provided with a through hole 322. The clamping elastic piece 33 is arranged in the groove 321;

[0044] The snap spring 33 is provided with a snap projection 331. The snap projection 331 is disposed in the snap hole 322 and extends into the snap groove 122. The snap projection 331 can be snapped into the snap groove 122, and the snap projection 331 is provided with an inclined surface facing the bolt head 11.

[0045] The specific structure of the snap mechanism 3 is as shown above. The snap spring 33 provided by the snap mechanism 3 is used to snap with the snap portion 121 composed of a plurality of snap grooves 122. The groove 321 is used to install the snap spring 33. At the same time, the groove 321 is welded in the groove 321 by laser welding, and at the same time, an elastic snap projection 331 is reserved. The setting of the snap hole 322 is used to achieve the avoidance position of the snap projection 331, so that the snap projection 331 can contact the snap groove 122.

[0046] Since the snap projection 331 on the snap spring 33 is provided with an inclined surface facing the bolt head 11, it can bounce repeatedly in the snap groove 122 of the snap portion 121 while the nut 2 and the screw 12 are gradually tightened. Furthermore, when the snap projection 331 is snapped when the nut 2 and the screw 12 are tightened, the tip of the snap projection 331 is snapped into the nearest snap groove 122, thereby preventing the nut 2 from coming off.

[0047] The snap spring 33 is further provided with a slope 332. The slope 332 faces the direction opposite to the bolt head 11. The included angle between the slope 332 and the tangent plane is α, 90° < α < 180°. The limiting member 32 is provided with a jack 323. The jack 323 can insert a shaft rod, and the shaft rod can abut against the slope 332, so that the snap projection 331 is away from the snap groove 122. Wherein α is preferably 135°.

[0048] The setting of the slope 332 can make the external insertion pin inserted into the jack 323 and contact the slope 332. And because the slope 332 is inclined, when the slope 332 is subjected to a force in the direction of the jack 323, its component force will push the snap projection 331 to the side, so that the snap projection 331 is away from the snap groove 122, thereby enabling the nut 2 to be screwed out. The shaft rod can adopt a threaded structure to push the snap projection 331 away from the position of the snap groove 122 by screwing and maintain it at this position, so that the nut 2 can be smoothly screwed out. It can achieve both the functions of anti-loosening and convenient screwing out.

[0049] The limiting member 32 and the abutting rotating piece 31 are integrally formed into a frame structure by welding. So that the limiting member 32 and the abutting rotating piece 31 rotate together, and the limiting member 32 is limited by the abutting rotating pieces 31 provided at both ends thereof.

[0050] The snap spring 33 is provided with a flat portion, and the flat portion is welded in the groove 321. The flat portion is disposed at both ends of the snap spring 33 and is used to weld the snap spring 33 and the groove 321.

[0051] Embodiments of the present invention are provided for purposes of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications suited to the particular use.

Claims

1. A bolt and nut assembly for preventing loosening, characterized in that: Comprising: A bolt (1), the bolt (1) includes a bolt head (11) and a screw rod (12) fixedly connected to the bolt head (11). An external thread portion (123) is provided on the screw rod (12), and at least one cutting plane is provided on the screw rod (12) parallel to its axis. A plurality of clamping grooves (122) arranged in an array along the axial direction are provided on the cutting plane, and the plurality of clamping grooves (122) form a clamping portion (121); A nut (2), the nut (2) is provided with an internal thread (21), and the internal thread (21) is in threaded connection with the external thread portion (123); A clamping mechanism (3), the clamping mechanism (3) is rotatably connected to the nut (2) along the axial direction of the screw rod (12). When the bolt (1) and the nut (2) are locked, the clamping mechanism (3) can be clamped in the clamping groove (122) to limit the nut (2) from loosening and coming off; The clamping mechanism (3) includes at least one limiting member (32), abutting rotating pieces (31) fixedly connected to both ends of the limiting member (32), and a clamping elastic piece (33) arranged in the limiting member (32); The cylindrical surface where the minor diameter of the internal thread (21) is located and the cutting plane enclose a semi-circular arc region, and the clamping mechanism (3) is arranged in this semi-circular arc region; The limiting member (32) is provided with a groove (321) along its length direction, and the limiting member (32) is further provided with a through clamping hole (322), and the clamping elastic piece (33) is arranged in the groove (321); The clamping elastic piece (33) is provided with a clamping protrusion (331), the clamping protrusion (331) is arranged in the clamping hole (322) and extends to the clamping groove (122), the clamping protrusion (331) can be clamped in the clamping groove (122), and the clamping protrusion (331) is provided with an inclined surface facing the bolt head (11); The clamping elastic piece (33) is further provided with a slope surface (332), the slope surface (332) faces the direction opposite to the bolt head (11), the included angle between the slope surface (332) and the cutting plane is α, 90° < α < 180°, the limiting member (32) is provided with an insertion hole (323), the insertion hole (323) can insert a shaft rod, and the shaft rod can abut against the slope surface (332) to make the clamping protrusion (331) away from the clamping groove (122).

2. The anti-loosening bolt and nut assembly according to claim 1, wherein: The limiting member (32) and the abutting rotating piece (31) are integrally formed into a frame structure by welding.

3. The anti-loosening bolt and nut assembly according to claim 2, wherein: The clamping elastic piece (33) is provided with a flat portion, and the flat portion is welded in the groove (321).

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