Double-nut lock bolt and nut assembly

Abstract

The utility model discloses a double-nut lock bolt and nut assembly which comprises a bolt, a first nut and a second nut, step teeth are arranged on the upper surface of the first nut and the upper surface of the second nut, the second nut is reversely screwed on a threaded rod of the bolt, and the first nut is positively screwed on the threaded rod of the bolt. When tightening torque is increased between the first nut and the second nut, the step teeth of the first nut and the second nut are in contact, the step teeth comprise a first slope and a second slope, the inclination of the first slope is smaller than that of the second slope, and the length of the first slope is larger than that of the second slope. The trend of the step teeth formed on the surfaces of the first nut and the second nut is the same as the screwing direction of the threads arranged on the screw rod of the bolt. In the process that the second nut is screwed into the bolt, then the first nut is screwed into the bolt, and then the first nut is continuously screwed, the step teeth of the first nut are meshed with the step teeth of the second nut. When the bolt vibrates, the first nut is not prone to loosening, the second nut is not prone to loosening, and the anti-loosening effect is more stable.

Description

Technical Field

[0001] This utility model relates to the field of fastener technology, and in particular to a double-nut anti-loosening bolt and nut assembly. Background Technology

[0002] Existing fasteners, such as bolt-nut assemblies, are conventionally configured with one nut per bolt. For example, a bolt with a right-hand thread (straight-threaded) has a nut screwed in, with the nut's inner thread matching the bolt's right-hand thread. This configuration lacks any anti-loosening measures, making the nut prone to loosening and movement when the bolt is subjected to vibration. Current anti-loosening measures, such as adding an extra nut (using two nuts on the same bolt and applying a tightening torque between them), ensure a reliable connection. Typically, two conventional nuts are screwed onto the same bolt, tightly fitted together. However, even with this structure, the nuts can still loosen when the bolt is subjected to significant vibration. Therefore, a more robust and anti-loosening bolt-nut structure is needed. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a relatively stable and anti-loosening double nut anti-loosening bolt and nut assembly.

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a double-nut anti-loosening bolt assembly, including a bolt, a nut one, and a nut two. Nut one and nut two are both screwed onto the bolt's thread. The upper surfaces of nut one and nut two are provided with stepped teeth. Nut two is screwed onto the bolt's thread in an inverted position, and nut one is screwed onto the bolt's thread in a normal position. When a tightening torque is applied between nut one and nut two, the stepped teeth of nut one and nut two come into contact. The stepped teeth include slope one and slope two. The slope of slope one is less than that of slope two, and the length of slope one is greater than that of slope two. The trend of the stepped teeth formed on the surfaces of nut one and nut two is the trend from the bottom of slope one to the top of slope one when the stepped tooth surface is facing upwards. The trend of the stepped teeth formed on the surfaces of nut one and nut two is the same as the direction of the thread on the bolt's thread.

[0005] Preferably, the upper surfaces of both nut one and nut two are provided with multiple circumferentially distributed stepped teeth. When the bolt is a bolt with a positive thread, the trend of the stepped teeth formed on the surface of nut one is clockwise when the stepped tooth surface faces upward, and the trend of the stepped teeth formed on the surface of nut two is clockwise when the stepped tooth surface faces upward, and the trend of the stepped teeth formed on the surface of nut two is clockwise when the stepped tooth surface faces upward, and the trend of the stepped teeth formed on the surface of nut two is clockwise.

[0006] Alternatively, when the bolt has a screw with a reverse thread, the trend of the teeth formed on the surface of nut one is that when the tooth surface is facing upward, the trend from the bottom of slope one to the top of slope one is counterclockwise, and the trend of the teeth formed on the surface of nut two is that when the tooth surface is facing upward, the trend from the bottom of slope one to the top of slope one is counterclockwise.

[0007] Preferably, when the bolt has a screw with a positive thread, the internal threads of the inner holes of Nut 1 and Nut 2 match the positive thread of the bolt.

[0008] Alternatively, when the bolt shank is a screw with a reverse thread, the internal threads of the inner holes of Nut 1 and Nut 2 match the reverse thread of the bolt shank.

[0009] Preferably, slope one and slope two form protrusions, slope one and slope two of the adjacent step form a groove, and when the steps of nut one and nut two come into contact, the protrusion slides into the groove.

[0010] Preferably, the first slope and the second slope are connected to form a sharp edge.

[0011] Preferably, slope one and slope two are not connected to form a gap surface.

[0012] The beneficial effects of this utility model are as follows: When nut one is screwed into the bolt first, and then nut two is screwed into the bolt, and nut one is continuously tightened, the teeth of nut one and nut two engage. When the bolt vibrates, the teeth of nut two resist the loosening direction of nut one, thus effectively reducing the loosening of nut one. Nut one is less likely to loosen, and nut two is also less likely to loosen, resulting in a more stable anti-loosening effect. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the bolt with a positive spiral thread according to this utility model;

[0014] Figure 2 This is a schematic diagram of the structure of the bolt with reverse thread according to this utility model;

[0015] Figure 3 This is a schematic diagram of the structure of nut one or nut two in Embodiment 1 of this utility model, where the indentation formed by multiple stepped teeth is in the positive direction;

[0016] Figure 4 This is a schematic diagram of the bolt and nut assembly when nut one and nut two are in contact in Embodiment 1 of this utility model;

[0017] Figure 5 This is a schematic diagram of the bolt and nut assembly in Embodiment 1 of this utility model when nut one and nut two are not in contact;

[0018] Figure 6 This is a schematic diagram of the structure of nut one or nut two in Embodiment 2 of this utility model, where the indentation formed by multiple teeth is in the positive direction.

[0019] Figure 7 This is a schematic diagram of the structure of nut one or nut two in embodiment three of this utility model, where the indentations formed by multiple teeth are in opposite directions.

[0020] Figure 8 This is a schematic diagram of the bolt and nut assembly when nut one and nut two are in contact in Embodiment 3 of this utility model;

[0021] Figure 9 This is a schematic diagram of the bolt and nut assembly in Embodiment 3 of this utility model, where nut one and nut two are not in contact. Figure 1 ;

[0022] Figure 10 This is a schematic diagram of the bolt and nut assembly in Embodiment 3 of this utility model, where nut one and nut two are not in contact. Figure 2 ;

[0023] Figure 11 This is a schematic diagram of the structure of nut one or nut two in embodiment four of this utility model, where the indentations formed by multiple teeth are in opposite directions.

[0024] Among them: 1. Bolt; 2. Nut 1; 3. Nut 2; 4. Bevel 1; 5. Bevel 2; 6. Sharp edge; 7. Interval surface. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0026] A double-nut anti-loosening bolt assembly includes a bolt 1, a nut 2, and a nut 3. Nuts 2 and 3 are both screwed onto the threaded shaft of bolt 1. The upper surfaces of nuts 2 and 3 are provided with stepped teeth. Nut 3 is screwed onto the threaded shaft of bolt 1 in an inverted position, while nut 2 is screwed onto the threaded shaft of bolt 1 in a normal position. When a tightening torque is applied between nuts 2 and 3, the stepped teeth of nuts 2 and 3 come into contact. The stepped teeth include a first slope 4 and a second slope 5. The slope of the first slope 4 is less than that of the second slope 5, and the length of the first slope 4 is greater than that of the second slope 5. The trend of the stepped teeth formed on the surfaces of nuts 2 and 3 is the trend from the bottom of the first slope 4 to the top of the first slope 4 when the stepped tooth surface is facing upwards. The trend of the stepped teeth formed on the surfaces of nuts 2 and 3 is the same as the direction of the thread on the threaded shaft of bolt 1. Nut 2 is upright, meaning that when the head of bolt 1 is facing upwards, the surface containing the stepped teeth of nut 2 is facing upwards; Nut 3 is inverted, meaning that when the head of bolt 1 is facing upwards, the surface containing the stepped teeth of nut 3 is facing downwards. The trend of the stepped teeth formed by the surfaces of nut 2 or nut 3 is such that when the stepped tooth surface is facing upwards, the trend of the slope bottom of slope 4 towards the slope top of slope 4 is either clockwise or counterclockwise. The bolt 1 has a threaded rod with a forward-rotating thread, or the bolt 1 has a threaded rod with a reverse-rotating thread.

[0027] Example 1: As Figure 4 , Figure 5 As shown, the bolt 1 used has a threaded rod as follows: Figure 1 The screw shown has a right-hand thread (straight-hand thread). The internal threads of the inner holes of nuts 1 and 2 and nuts 2 match the right-hand thread of the screw. The upper surfaces of nuts 1 and 2 and nuts 2 are provided with multiple circumferentially distributed stepped teeth.

[0028] like Figure 3 As shown, the trend of the stepped teeth formed on the surface of nut 2 is clockwise from the bottom of slope 4 to the top of slope 4 when the stepped tooth surface is facing upwards. The indentation formed by multiple stepped teeth (multiple slopes) is in the positive direction. The trend of the stepped teeth formed on the surface of nut 3 is clockwise from the bottom of slope 4 to the top of slope 4 when the stepped tooth surface is facing upwards. In this embodiment, as... Figure 3 As shown, slope 4 and slope 5 connect to form a sharp ridge 6; slope 4 and slope 5 form a protrusion, and slope 4 and the adjacent step slope 5 form a groove. When the steps of nut 2 and nut 3 come into contact, the protrusion slides into the groove. The parts to be fastened, part 1 and part 2, are clamped between the head of bolt 1 and nut 3. First, nut 3 is screwed into the bolt 1 inverted position, and then nut 2 is screwed into the bolt 1 in upright position.

[0029] Example 2: Nut 1 2 and Nut 2 3 are provided with multiple circumferentially distributed stepped teeth on their upper surfaces. The bolt 1 used is a bolt with a right-hand thread. The internal threads of the inner holes of Nut 1 2 and Nut 2 3 are matched with the right-hand thread of the bolt.

[0030] like Figure 6 As shown, the trend of the stepped teeth formed on the surface of nut 2 is clockwise from the bottom of slope 4 to the top of slope 4 when the stepped tooth surface is facing upwards. Similarly, the trend of the stepped teeth formed on the surface of nut 3 is clockwise from the bottom of slope 4 to the top of slope 4 when the stepped tooth surface is facing upwards. In this second embodiment, as... Figure 6 As shown, slope 4 and slope 5 are not connected to form a spacer surface 7. Slope 4 and slope 5 form protrusions, and slope 4 and the adjacent stepped slope 5 form a groove. When the stepped teeth of nut 2 and nut 3 come into contact, the protrusions slide into the grooves. The parts to be fastened, part 1 and part 2, are clamped between the head of bolt 1 and nut 3. First, nut 3 is screwed into the bolt 1 inverted position, and then nut 2 is screwed into the bolt 1 in upright position.

[0031] Example 3: Figure 8 , Figure 9 , Figure 10 As shown, the upper surfaces of nuts 1 and 2 are both provided with multiple circumferentially distributed stepped teeth, and the bolt 1 used has a threaded shaft as shown in the figure. Figure 2 The screw shown has a reverse thread (left-hand thread), and the internal threads of the inner holes of nuts 1-2 and 2-3 match the reverse thread of the screw.

[0032] like Figure 7 As shown, the trend of the stepped teeth formed on the surface of nut 2 is that when the stepped tooth surface is facing upward, the trend of the slope bottom of slope 4 to the slope top of slope 4 is counterclockwise, and the indentation formed by multiple stepped teeth (multiple slopes) is in the opposite direction. The trend of the stepped teeth formed on the surface of nut 3 is that when the stepped tooth surface is facing upward, the trend of the slope bottom of slope 4 to the slope top of slope 4 is counterclockwise.

[0033] In this third embodiment, slope 4 and slope 5 connect to form a sharp ridge 6; slope 4 and slope 5 form a protrusion, and slope 4 and the adjacent step slope 5 form a groove. When the steps of nut 2 and nut 3 come into contact, the protrusion slides into the groove. The parts to be fastened, part 1 and part 2, are clamped between the bolt head of bolt 1 and nut 3. First, nut 3 is screwed into the bolt 1 inverted position, and then nut 2 is screwed into the bolt 1 in upright position.

[0034] Example 4: Nut 1 2 and Nut 2 3 are provided with multiple circumferentially distributed stepped teeth on their upper surfaces. The bolt 1 used is a bolt with a reverse thread (left-hand thread). The internal threads of the inner holes of Nut 1 2 and Nut 2 3 are matched with the reverse thread of the bolt.

[0035] like Figure 11 As shown, the trend of the stepped teeth formed on the surface of nut 2 is that when the stepped tooth surface is facing upward, the trend of the slope bottom of slope 4 to the slope top of slope 4 is counterclockwise. The trend of the stepped teeth formed on the surface of nut 3 is that when the stepped tooth surface is facing upward, the trend of the slope bottom of slope 4 to the slope top of slope 4 is counterclockwise.

[0036] In this fourth embodiment, as Figure 11 As shown, slope 4 and slope 5 are not connected to form a spacer surface 7. Slope 4 and slope 5 form protrusions, and slope 4 and the adjacent stepped slope 5 form a groove. When the stepped teeth of nut 2 and nut 3 come into contact, the protrusion slides into the groove. The parts to be fastened, part 1 and part 2, are clamped between the head of bolt 1 and nut 3. First, nut 3 is screwed into the bolt 1 inverted position, and then nut 2 is screwed into the bolt 1 in upright position.

[0037] In the four embodiments of this utility model, during the process of first screwing nut 2 3 into bolt 1 and then screwing nut 2 into it, and then continuously tightening nut 2, the teeth of nut 2 and nut 3 interlock and exert stress on nut 2 3. When bolt 1 vibrates, the teeth of nut 2 3 tend to block the loosening direction of nut 2, thus effectively reducing the loosening of nut 2. Nut 2 is not easy to loosen, and nut 2 3 is also not easy to loosen, making its anti-loosening effect more stable.

[0038] The above description is only a specific embodiment of the present utility model. Various examples and illustrations do not constitute a limitation on the substantive content of the present utility model. Those skilled in the art can modify or transform the above-described specific embodiments after reading the description without departing from the essence and scope of the utility model.

Claims

1. A double-nut anti-loosening bolt assembly, comprising a bolt (1), a first nut (2), and a second nut (3), characterized in that: Nut 1 (2) and Nut 2 (3) are both screwed onto the screw of bolt (1). The upper surfaces of Nut 1 (2) and Nut 2 (3) are provided with stepped teeth. Nut 2 (3) is screwed onto the screw of bolt (1) inverted position, and Nut 1 (2) is screwed onto the screw of bolt (1) upright. When tightening torque is increased between Nut 1 (2) and Nut 2 (3), the stepped teeth of Nut 1 (2) and Nut 2 (3) come into contact. The stepped teeth include slope 1 (4) and slope 2 (5). The slope of slope 1 (4) is less than that of slope 2 (5), and the length of slope 1 (4) is greater than that of slope 2 (5). The trend of the stepped teeth formed on the surfaces of Nut 1 (2) and Nut 2 (3) is the trend of the bottom of slope 1 (4) to the top of slope 1 (4) when the stepped tooth surface is facing upward. The trend of the stepped teeth formed on the surfaces of Nut 1 (2) and Nut 2 (3) is the same as the direction of the thread on the screw of bolt (1).

2. The double-nut anti-loosening bolt and nut assembly according to claim 1, characterized in that: Nut 1 (2) and Nut 2 (3) are both provided with multiple circumferentially distributed stepped teeth on their upper surfaces. When the bolt (1) is a bolt with a positive spiral thread, the trend of the stepped teeth formed on the surface of Nut 1 (2) is clockwise when the stepped tooth surface faces upward and the trend of the bottom of the slope (4) towards the top of the slope (4). The trend of the stepped teeth formed on the surface of Nut 2 (3) is clockwise when the stepped tooth surface faces upward and the trend of the bottom of the slope (4) towards the top of the slope (4). Alternatively, when the bolt (1) has a screw with a reverse thread, the trend of the teeth formed on the surface of nut one (2) is that when the tooth surface is facing upward, the trend of the slope bottom of slope one (4) to the slope top of slope one (4) is counterclockwise, and the trend of the teeth formed on the surface of nut two (3) is that when the tooth surface is facing upward, the trend of the slope bottom of slope one (4) to the slope top of slope one (4) is counterclockwise.

3. The double-nut anti-loosening bolt and nut assembly according to any one of claims 1-2, characterized in that: When the bolt (1) has a screw with a positive thread, the internal threads of the inner holes of nut one (2) and nut two (3) match the positive thread of the bolt. Alternatively, when the bolt (1) has a screw with a reverse thread, the internal threads of the inner holes of nut one (2) and nut two (3) match the reverse thread of the screw.

4. The double-nut anti-loosening bolt and nut assembly according to claim 1, characterized in that: The first slope (4) and the second slope (5) form a protrusion. The first slope (4) and the second slope (5) of the adjacent step form a groove. When the steps of the first nut (2) and the second nut (3) come into contact, the protrusion slides into the groove.

5. The double-nut anti-loosening bolt and nut assembly according to claim 1 or 4, characterized in that: The first slope (4) and the second slope (5) are connected to form a sharp edge (6).

6. The double-nut anti-loosening bolt and nut assembly according to claim 1 or 4, characterized in that: The slope one (4) and slope two (5) are not connected to form a gap surface (7).

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