Bolt and nut fastener

Abstract

The utility model discloses a bolt and nut fastener which comprises a bolt, a nut and a connecting piece. During use, the connecting piece is firstly connected to the nut; the annular end face of the gasket is attached to a workpiece needing to be connected; then, the screw rod part of the bolt is inserted, and the screw rod part penetrates through the two workpieces, the connecting piece and the inserting piece to enter the groove; then the thread is in contact with the threaded hole, and the bolt is rotated around the first direction; and finally, when the bolt is tightened, the bolt is stopped when the side, extending outwards, of the limiting piece enters the next limiting groove. The bolt is screwed out of the nut through interference of the connecting piece, so that threaded connection between the bolt and the nut is stable and not prone to loosening. Correspondingly, when threaded connection of the bolt and the nut needs to be removed, large torque needs to be applied to the bolt, and a connecting piece is damaged; when the bolt and the nut are in threaded connection again, a new connecting piece is used.

Description

Technical Field

[0001] This utility model relates to fasteners, and more particularly to a bolt and nut fastener. Background Technology

[0002] Bolts and nuts are a common type of fastener. To improve connection stability, washers are often added between the nut and the workpiece, or a nut with an integrated washer is used. Furthermore, for nuts with an integrated washer, the contact surface between the washer and the workpiece is designed with a serrated edge to increase friction and further prevent loosening. However, existing bolt and nut fasteners still have some problems: in some vibrating operating environments, the threaded connection between the nut and bolt is still not secure enough, and the nut may loosen. Utility Model Content

[0003] This application provides a bolt and nut fastener that can solve the problems mentioned in the background art.

[0004] This application provides a bolt and nut fastener, comprising:

[0005] The bolt has at least one groove along the axial direction, the groove penetrating the end of the bolt away from the nut;

[0006] The nut has a washer at one end; the center hole is stepped, and starting from the washer end, there are: a limiting hole with decreasing inner diameter, a positioning hole, and a threaded hole; the inner wall of the limiting hole has a ring of multiple limiting grooves, and each limiting groove is composed of a first inner wall and a second inner wall.

[0007] The connector includes: a first annular body that mates with a positioning hole, and a second annular body that mates with a limiting hole; the inner wall of the first annular body has an insertion piece that enters a groove; the outer wall of the second annular body has a plurality of outwardly extending limiting pieces;

[0008] In this configuration, when the connector rotates relative to the nut in the direction the bolt is screwed into the nut, the side of the limiting piece extending outward can adhere to and pass through the first inner wall of any limiting groove; when the connector rotates relative to the nut in the direction the bolt is screwed out of the nut, the side of the limiting piece extending outward is blocked by the second inner wall of the corresponding limiting groove.

[0009] In some embodiments, the annular end face of the gasket has a ring of connected connecting blocks, which form a ring of serrations.

[0010] In some embodiments, the limiting hole is formed by multiple connecting blocks, and the limiting groove is composed of two adjacent connecting blocks.

[0011] In some embodiments, the screw portion includes: a threaded section connected to a nut at a first end, and a smooth section connected to a second end of the threaded section; the end of the smooth section away from the nut is chamfered.

[0012] In some embodiments, the number of limiting pieces is four.

[0013] In some embodiments, there are two grooves, which are opposite each other.

[0014] In summary, this application discloses a bolt and nut fastener, comprising a bolt, a nut, and a connector. In use, the connector is first attached to the nut; then, the annular end face of the washer is placed against the workpieces to be connected; next, the bolt's threaded portion is inserted, passing through both workpieces and the connector, with the insert plate entering the groove; then, the thread contacts the threaded hole, and the bolt is rotated in a first direction; finally, when tightening the bolt, it stops when the limiting plate extends outward and enters the next limiting groove. The connector interferes with the bolt's unscrewing from the nut, ensuring a stable threaded connection between the bolt and nut, preventing loosening. Correspondingly, when the threaded connection between the bolt and nut needs to be released, a relatively large torque needs to be applied to the bolt to destroy the connector; when the bolt and nut are re-threaded, a new connector is used. Attached Figure Description

[0015] To better illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application or the background art will be described below.

[0016] Figure 1 A schematic diagram of one embodiment of a nut;

[0017] Figure 2 A schematic diagram of one embodiment of the connector;

[0018] Figure 3 A schematic diagram of one embodiment of a bolt;

[0019] Figure 4 for Figure 1 Nuts and Figure 2 A schematic diagram of the connector mating parts;

[0020] Figure 5 A schematic diagram of one embodiment of a connecting block provided with a nut;

[0021] Figure 6 A schematic diagram of another embodiment of the connecting block with the nut;

[0022] Figure 7 for Figure 6 Nuts and Figure 2 A schematic diagram of the fitting of the connectors.

[0023] In the picture,

[0024] 1. Bolt; 11. Screw section; 111. Threaded section; 112. Smooth section; 12. Nut; 1a. Groove;

[0025] 2. Nut; 2a. Washer; 2b. Center hole; 2b1. Limiting hole; 2b2. Positioning hole; 2b3. Threaded hole; 2c. Limiting groove; 2c1. First inner wall; 2c2. Second inner wall; 2d. Connecting block; 2d1. First arc-shaped outer wall; 2d2. Second arc-shaped outer wall; 2d3. Third outer wall;

[0026] 3. Connector; 31. First annular body; 32. Second annular body; 3a. Insertion piece; 3b. Limiting piece. Specific Implementation

[0027] The following description is provided in conjunction with the accompanying drawings, which are for illustrative purposes only and not strictly to scale. Unless otherwise defined, the technical or scientific terms used in this disclosure should be understood in their ordinary sense by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described object changes. Unless otherwise specified, the embodiments in this application can be combined with each other.

[0028] Please see Figure 1 , Figure 2 and Figure 3 A bolt and nut fastener, comprising a bolt 1, a nut 2, and a connector 3.

[0029] Please see Figure 3 The bolt 1 includes a threaded portion 11 and a nut 12. The threaded portion 11 has at least one groove 1a along the axial direction, the groove 1a penetrating the end of the threaded portion away from the nut 12.

[0030] Please see Figure 1 The nut 2 has a washer 2a at one end, meaning the nut 2 and washer 2a are integral. The center hole 2b of the nut 2 is stepped, and starting from the washer 2a end, there are a limiting hole 2b1, a positioning hole 2b2, and a threaded hole 2b3. The diameters of these three holes decrease in the above order, that is, the inner diameter of the limiting hole 2b1 is larger than the inner diameter of the positioning hole 2b2, and the inner diameter of the positioning hole 2b2 is larger than the major diameter of the internal thread on the threaded hole 2b3.

[0031] The inner wall of the limiting hole 2b1 has a ring of multiple interconnected limiting grooves 2c, each limiting groove 2c consisting of a first inner wall 2c1 and a second inner wall 2c2. That is, the multiple limiting grooves 2c are arranged in a circular array around the axis of the limiting hole 2b1. For two adjacent limiting grooves 2c, the outer edge of the first inner wall 2c1 of one limiting groove 2c is connected to the outer edge of the second inner wall 2c2 of the other limiting groove 2c.

[0032] Please see Figure 2 The connector 3 includes a first annular body 31 and a second annular body 32. The first annular body 31 is used to mate with the positioning hole 2b2, that is, the first annular body 31 is located inside the positioning hole 2b2, and the outer diameter of the first annular body 31 is equal to the inner diameter of the positioning hole 2b2. The first annular body 31 is inserted into the positioning hole 2b2 for positioning, restricting the radial movement of the connector 3. The second annular body 32 is used to mate with the limiting hole 2b1, that is, the second annular body 32 is located inside the limiting hole 2b1, and the thickness of the second annular body 32 is equal to the depth of the limiting hole 2b1. The connector 3 is connected to the nut 2, and after the annular end face of the washer 2a is attached to the workpiece to be connected, the axial movement of the connector 3 is restricted.

[0033] The inner wall of the first annular body 31 has a plug-in piece 3a that enters the groove 1a. That is, the screw part 11 needs to pass through the connector 3 first and then be threaded into the threaded hole 2b3. At the same time as passing through the connector 3, the plug-in piece 3a enters the groove 1a, so that the bolt 1 and the connector 3 rotate together.

[0034] In some embodiments, there are two grooves 1a, which are opposite each other. Correspondingly, there are also two insert pieces 3a, which are opposite each other.

[0035] The number of grooves 1a is relatively small, making them relatively easy to process, and the connection between groove 1a and insert piece 3a is also relatively stable.

[0036] Please see Figure 3 In some embodiments, the screw portion 11 includes: a threaded section 111 connected to a first end and a nut 12, and a smooth section 112 connected to a second end of the threaded section 111; the end of the smooth section 112 away from the nut 12 is chamfered.

[0037] Adding a smooth section 112 makes the machining of the groove 1a easier, makes it easier for the insert piece 3a to enter the groove 1a, and makes it easier for the screw part 11 and the threaded hole 2b3 to be threaded together.

[0038] Please see Figure 2 The outer wall of the second annular body 32 has a plurality of outwardly extending limiting pieces 3b. That is, one side of the limiting piece 3b is connected to the outer wall of the second annular body 32, and the other side extends outward.

[0039] Please see Figure 4The direction in which bolt 1 is screwed into nut 2 is set as the first direction. Connector 3 rotates relative to nut 2 around this first direction. The outwardly extending side of the limiting piece 3b can adhere to and pass through the first inner wall 2c1 of any limiting groove 2c. That is, as connector 3 passes through the first inner wall 2c1, it presses against the outwardly extending side of limiting piece 3b, bringing this side closer to the second annular body 32 and accumulating potential energy. The instant connector 3 passes through the first inner wall 2c1, the outwardly extending side of limiting piece 3b loses its place to adhere, the accumulated potential energy is released, and this side enters the next limiting groove 2c, re-adhering to the first inner wall 2c1 of that groove. A clicking sound is emitted when limiting piece 3b re-adheres to the first inner wall 2c1. Even without seeing connector 3, this sound indicates that the outwardly extending side of limiting piece 3b has entered the next limiting groove 2c. Correspondingly, connector 3 will not interfere with bolt 1 screwing into nut 2.

[0040] The direction in which bolt 1 is screwed into nut 2 is set as the second direction. Connector 3 rotates relative to nut 2 around the second direction, and the outwardly extending side of the limiting piece 3b is blocked by the second inner wall 2c2 of the corresponding limiting groove 2c. Accordingly, connector 3 will interfere with bolt 1 unscrewing from nut 2.

[0041] In some embodiments, the number of limiting pieces 3b is four. The number of limiting pieces 3b is related to the number of limiting slots 2c. For example, in the attached figure, there are 24 limiting slots 2c. The number of limiting pieces 3b can be designed to be divisible by 24, so that all limiting pieces 3b can fit into the corresponding limiting slots 2c in the same state. If the number of limiting pieces 3b is too small, the effect of interfering with the bolt 1 unscrewing the nut 2 is generally poor; if the number of limiting pieces 3b is too large, it will be more difficult for the bolt 1 to screw into the nut 2.

[0042] In use, first connect the connector 3 to the nut 2; then place the annular end face of the washer 2a against the workpiece to be connected; next, insert the screw portion 11 of the bolt 1, which passes through both workpieces, through the connector 3, and the insert piece 3a into the groove 1a; then the thread contacts the threaded hole 2b3, and the bolt 1 is rotated around the first direction; finally, when tightening the bolt 1, stop when the limiting piece 3b extends outward and enters the next limiting groove 2c. The connector 3 interferes with the bolt 1 unscrewing from the nut 2, making the threaded connection between the bolt 1 and the nut 2 stable and not easy to loosen. Correspondingly, when it is necessary to disconnect the threaded connection between the bolt 1 and the nut 2, a relatively large torque needs to be applied to the bolt 1 to destroy the connector 3; when the bolt 1 and the nut 2 are re-threaded, a new connector 3 is used.

[0043] Please see Figure 5In some embodiments, the annular end face of the gasket 2a has a ring of connected connecting blocks 2d, which form a ring of serrations. More specifically, the connecting blocks 2d have a first arc-shaped outer wall 2d1 and a second arc-shaped outer wall 2d2; the second arc-shaped outer wall 2d2 has the same dimensions as the first arc-shaped outer wall 2d1, and is obtained by rotating the first arc-shaped outer wall 2d1 around the axis of the central hole 2b by a corresponding angle (for example, in the figure, there are 24 connecting blocks 2d, so the rotation angle is 15 degrees); for two adjacent connecting blocks 2d, the first arc-shaped outer wall 2d1 of one connecting block 2d fits into the second arc-shaped outer wall 2d2 of the other connecting block 2d; the edges of the first arc-shaped outer wall 2d1 and the second arc-shaped outer wall 2d2 away from the annular end face are not aligned, so that the surface connecting these two edges is not flat, forming serrations.

[0044] Multiple connecting blocks 2d form a serrated ring, replacing the annular end face in contact with the workpiece (the second annular body 32 of the connector 3 needs to be thickened to maintain its fit with the workpiece), increasing the friction between the nut 2 and the workpiece, making the nut 2 less prone to loosening.

[0045] Please see Figure 6 and Figure 7 In some embodiments, based on the above-described embodiment where "the annular end face of the gasket 2a has a ring of interconnected connecting blocks 2d", the limiting hole 2b1 is surrounded by multiple connecting blocks 2d, and the limiting groove 2c is composed of two adjacent connecting blocks 2d. More specifically, the connection between the first arc-shaped outer wall 2d1 and the second arc-shaped outer wall 2d2 can be chamfered to form a third outer wall 2d3, which is the second inner wall 2c2 of the limiting groove 2c; for two adjacent connecting blocks 2d, the first arc-shaped outer wall 2d1 extends beyond the second arc-shaped outer wall 2d2, and the extended portion is the first inner wall 2c1 of the limiting groove 2c. Correspondingly, the second annular body 32 of the connector 3 does not need to be thickened.

Claims

1. A bolt-nut fastener characterized by, The utility model relates to a bolt-nut connection structure, comprising: a bolt (1), a screw rod part (11) has at least one recess (1a) in the axial direction, the recess (1a) penetrates the end of the screw rod away from the nut (12); a nut (2), one end has a gasket (2a), a central hole (2b) is stepped, from the gasket (2a) this end starts in proper order: the limiting hole (2b1) of inner diameter reduction, the positioning hole (2b2), the threaded hole (2b3), the inner wall of limiting hole (2b1) has a plurality of limiting grooves (2c) connected in a circle, any limiting groove (2c) is composed of first inner wall (2c1), second inner wall (2c2); a connecting piece (3), comprising: the first annular body (31) that is cooperated with the positioning hole (2b2), the second annular body (32) that is cooperated with the limiting hole (2b1), the first annular body (31) inner wall has the insertion piece (3a) into the recess (1a), the second annular body (32) outer wall has a plurality of outwardly extending limiting pieces (3b); Wherein, the connecting piece (3) is rotated relative to the nut (2) in the direction of being screwed into the nut (2) around the bolt (1), and the outwardly extending side of the limiting piece (3b) can be attached and pass the first inner wall (2c1) of any limiting groove (2c), the connecting piece (3) is rotated relative to the nut (2) in the direction of being screwed out of the nut (2) around the bolt (1), and the outwardly extending side of the limiting piece (3b) is blocked by the second inner wall (2c2) of the corresponding limiting groove (2c).

2. A bolt and nut fastener according to claim 1 wherein, The gasket (2a) annular end face has a plurality of connecting blocks (2d) connected in a circle, and the plurality of connecting blocks (2d) form a circle sawtooth.

3. A bolt and nut fastener according to claim 2, wherein The limiting hole (2b1) is surrounded by the plurality of connecting blocks (2d), and the limiting groove (2c) is composed of two adjacent connecting blocks (2d).

4. A bolt and nut fastener according to claim 1 wherein, The screw rod part (11) comprises: a threaded segment (111) connected with the first end of the nut (12), a smooth segment (112) connected with the second end of the threaded segment (111), and an end of the smooth segment (112) away from the nut (12) is inverted at an angle.

5. A bolt and nut fastener according to claim 1 wherein, The number of limiting pieces (3b) is four.

6. A bolt and nut fastener according to claim 1 wherein, The number of recesses (1a) is two, and they are opposite.

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