Anti-loosening combination bolts

Abstract

The present invention discloses an anti-loosening combination bolt component, which includes: a bolt, which includes a head and a rod, the circumference of the rod is provided with an external thread, the external thread includes a spirally arranged external screw peak; a nut, which is provided with an internal thread, the internal thread includes a spirally arranged internal screw root, the internal screw root and the spirally arranged radius of the external screw peak are equal; wherein, the bolt and the nut are both made of metal material, and the hardness of the bolt is less than that of the nut, and the internal thread also includes a spirally arranged trimming screw root, which is trimmed and deformed when the external screw peak moves from the internal screw root to the trimming screw root. When at least two components are locked and fixed by the anti-loosening combination bolt component provided by the present application, it is only necessary to thread the bolt and the nut, which avoids adding additional assembly steps, is simple to operate, and has low assembly difficulty and short time consumption.

Description

Technical Field

[0001] The present application relates to the technical field of fasteners, and in particular to an anti-loosening combined bolt component. Background Art

[0002] Combination bolts are a type of fastener used for fastening connections and are widely used in vehicles, ships, railways, bridges, and more. Combination bolts consist of a pair of mating bolts and nuts. The bolt typically passes through at least two components and is threadedly connected to the nut to secure the two components together.

[0003] Existing combination bolts usually also take anti-loosening measures to prevent the combination bolts from loosening and failing to maintain the fixation between the components. For example, stop washers are provided between the nut and the bolt head and the component, and the nut is detachably provided with a pin along its radial direction to tighten the bolt rod.

[0004] However, the existing combined bolts often have complicated assembly steps due to the anti-loosening measures they adopt, which increases the difficulty and time consumption during assembly and causes inconvenience. Summary of the Invention

[0005] In order to reduce the difficulty and time consumption of assembling a combination bolt member after adopting anti-loosening measures, the present application provides an anti-loosening combination bolt member.

[0006] The present application provides an anti-loosening combination bolt component, the anti-loosening combination bolt component comprising:

[0007] A bolt comprising a head and a shank, wherein the head is coaxially arranged with and connected to the shank, and the circumference of the shank is provided with an external thread, wherein the external thread comprises a spirally arranged external screw crest; and

[0008] A nut having an internal thread, wherein the internal thread includes a helically arranged internal thread root, the internal thread root and the helically arranged external thread crest having the same radius, so as to threadably connect the nut to the rod;

[0009] In which, the bolt and the nut are both made of metal material, and the hardness of the bolt is less than that of the nut. The internal thread also includes a spirally arranged trimming screw root, which is arranged at one end of the nut away from the head, and one end is connected to the internal screw root, and the other end extends to the outside of the nut. The axis of the spiral setting of the trimming screw root is eccentric to the axis of the spiral setting of the internal screw root, and the radius of the spiral setting of the trimming screw root is smaller than the radius of the spiral setting of the internal screw root. When the outer screw peak moves from the internal screw root to the trimming screw root, it is trimmed and deformed.

[0010] Optionally, a circle formed by axially projecting the trimming screw root onto the head is tangent to a circle formed by axially projecting the inner screw root onto the head.

[0011] Optionally, the outer spiral peak is configured as an edge.

[0012] Optionally, the trimming screw root is set to an arc-shaped surface.

[0013] Optionally, the trimming screw root is configured to be conical along the direction of its spiral setting, and the small end is connected to the inner screw root, and the large end extends to the outside of the nut.

[0014] Optionally, the inner screw root is spirally arranged to pass through the middle of the trimming screw root.

[0015] Optionally, the surface of the trimmed screw root is provided with a titanium carbide nitrogen coating.

[0016] Optionally, the external thread further includes a spirally arranged external thread root, and the internal thread further includes a spirally arranged internal thread crest, and the external thread root and the internal thread crest have the same spirally arranged radius.

[0017] Optionally, the external thread also includes a pair of external screw bellies extending between the external screw peak and the external screw root, and the internal thread also includes a pair of internal screw bellies arranged between the internal screw root and the internal screw peak, the pair of external screw bellies corresponding to the pair of internal screw bellies one-to-one, and both are in face-to-face contact.

[0018] Optionally, the line segments formed by the pair of outer spiral bellies in the axial cross section of the rod portion are respectively arranged obliquely on both sides of the horizontal line.

[0019] The present invention provides a trimming screw root at the end of the nut away from the head to trim the outer thread peak passing through the nut. This allows the outer thread peak passing through the nut to re-enter the inner thread root only when a greater driving force is required. This further reduces the likelihood of reverse rotation of the bolt after tightening, thereby achieving the purpose of preventing loosening. At the same time, when locking and fixing at least two components using the anti-loosening combination bolt provided by the present invention, only the bolt and nut need to be threaded together, avoiding the addition of additional assembly steps, simplifying the operation, and reducing the difficulty and time consumption of assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the structure of an anti-loosening combination bolt assembly provided in one embodiment of the present application.

[0021] Figure 2 It is a cross-sectional view of a nut of an anti-loosening combination bolt assembly provided in one embodiment of the present application.

[0022] Figure 3It is a cross-sectional view of an anti-loosening combination bolt member provided in one embodiment of the present application.

[0023] Figure 4 This is a schematic diagram of the inner thread root and the trimming thread root of the anti-loosening combination bolt provided by one embodiment of the present application when projected onto the head.

[0024] Explanation of the accompanying reference numerals: 1. Bolt; 11. Head; 12. Rod; 13. Twisting portion; 14. Gasket portion; 2. External thread; 21. External thread peak; 22. External thread root; 23. External thread belly; 3. Nut; 4. Internal thread; 41. Internal thread root; 42. Trimming thread root; 43. Internal thread peak; 44. Internal thread belly. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1-4 This application is described in further detail.

[0026] The present application discloses an anti-loosening combination bolt assembly, which includes:

[0027] A bolt 1 comprising a head 11 and a shank 12, wherein the head 11 and the shank 12 are coaxially arranged and connected, and the circumference of the shank 12 is provided with an external thread 2, wherein the external thread 2 includes a spirally arranged external thread peak 21; and

[0028] A nut 3 having an internal thread 4, wherein the internal thread 4 includes a helically arranged internal thread root 41, wherein the internal thread root 41 and the external thread crest 21 have the same radius as each other, so as to threadably connect the nut 3 to the rod 12;

[0029] Among them, the bolt 1 and the nut 3 are both made of metal material, and the hardness of the bolt 1 is less than that of the nut 3. The internal thread 4 also includes a spirally arranged trimming screw root 42. The trimming screw root 42 is arranged at one end of the nut 3 away from the head 11, and one end is connected to the internal screw root 41, and the other end extends to the outside of the nut 3. The axis of the spiral setting of the trimming screw root 42 is eccentric to the axis of the spiral setting of the internal screw root 41, and the radius of the spiral setting of the trimming screw root 42 is smaller than the radius of the spiral setting of the internal screw root 41. When the outer screw peak 21 moves from the internal screw root 41 to the trimming screw root 42, it is trimmed and deformed.

[0030] Reference Figure 1 and Figure 2In this embodiment, for example, the head 11 and the shank 12 of the bolt 1 are integrally formed, and can be made of stainless steel. The shank 12 is cylindrical, and the external thread 2 is provided on the circumference of the shank 12 and is integrally formed with the bolt 1. The external thread 2 is provided at least at one end of the shank 12 away from the head 11. The head 11 may include a screwing portion 13 and a gasket portion 14. The head 11 may be in the shape of a regular hexagonal prism. The head 11 is used to connect with a tool such as a wrench to facilitate driving the bolt 1 to rotate. The gasket portion 14 is disc-shaped and is integrally provided at one end of the screwing portion 13 close to the shank 12.

[0031] Nut 3 can also be made of stainless steel, and its hardness is greater than that of bolt 1. It is understood that, because nut 3 is made of a harder metal, it is less susceptible to deformation than bolt 1. Nut 3 can be configured to have the same shape as head 11, and a threaded through-hole is provided in the middle of the axial direction of nut 3. The inner sidewall of this threaded through-hole forms internal threads 4, i.e., internal threads 4 and nut 3 are integrally formed.

[0032] like Figure 2 and Figure 3 As shown, in this embodiment, the external thread 2 includes a spirally arranged external thread peak 21, and the external thread peak 21 is the portion of the external thread 2 away from the axis of the rod 12. The internal thread 4 includes a spirally arranged internal thread root 41, and the internal thread root 41 is the portion of the internal thread 4 away from the axis of the nut 3. The equal radii of the spiral arrangement of the external thread peak 21 and the internal thread root 41 can be understood as follows: the radius of the spiral arrangement of the side of the external thread peak 21 farthest from the axis of the rod 12 is equal to the radius of the spiral arrangement of the side of the internal thread root 41 farthest from the axis of the nut 3, so that the external thread 2 forms a limited position when entering the internal thread 4, thereby threading the nut 3 and the rod 12. In this embodiment, the external thread peak 21 and the internal thread root 41 have the same shape.

[0033] like Figure 2 and Figure 3 As shown, in more detail, the internal thread 4 further includes a trimming screw root 42, which is provided at the end of the nut 3 away from the head 11, and one end of the trimming screw root 42 is connected to the internal thread root 41, while the other end extends to the outside of the nut 3. When the bolt 1 is threadedly connected to the nut 3 and passes through the nut 3, the external thread peak 21 enters from the internal thread root 41, then passes through the internal thread root 41 and enters the trimming screw root 42 from the internal thread root 41, and finally passes through the trimming screw root 42 and passes through the nut 3. The trimming screw root 42 is also helically arranged, and its helical axis is eccentric with the helical axis of the internal thread root 41, that is, it is not coaxial; and the helical radius of the trimming screw root 42 is smaller than the helical radius of the internal thread root 41, that is, along the radial direction of the internal thread root 41, the trimming screw root 42 is close to the axis of the internal thread root 41 when extending along the end of the nut 3 away from the head 11.

[0034] It is understood that since the hardness of the nut 3 is greater than that of the bolt 1, when the outer thread peak 21 passes through the trimming screw root 42, the trimming screw root 42 can trim the outer thread peak 21 of the external thread 2, so that the shape of the outer thread peak 21 passing through the nut 3 is trimmed to a shape different from that of the inner thread root 41. When the head 11 of the nut 3 and the bolt 1 are respectively abutted against the sides of at least two components to be fixed, the components can be locked and fixed. After locking and fixing, since the outer thread peak 21 is relatively easy to deform and difficult to recover, when the bolt 1 is rotated in the reverse direction, a greater driving force needs to be applied to the bolt 1 to allow the outer thread peak 21 to pass through the trimming screw root 42 and enter the inner thread root 41.

[0035] In summary, this embodiment provides a trimming screw root 42 at the end of the nut 3 away from the head 11 to trim the outer thread peak 21 passing through the nut 3. This allows the trimming screw root 42 to re-enter the inner thread root 41 only when a greater driving force is required. This further reduces the likelihood of reverse rotation of the bolt 1 after tightening, thereby achieving the purpose of preventing loosening. Furthermore, when the anti-loosening combination bolt assembly provided by this embodiment is used to lock and secure at least two components, only the bolt 1 and the nut 3 need to be threaded together, avoiding the need for additional assembly steps. The operation is simple, and the assembly is relatively easy and time-consuming.

[0036] Specifically, a circle formed by axially projecting the trimming screw root 42 onto the head 11 is tangent to a circle formed by axially projecting the inner screw root 41 onto the head 11 .

[0037] like Figure 2 and Figure 4 As shown, in this embodiment, for example, the circle formed by the axial projection of the trimming screw root 42 onto the head 11 can be understood as follows: the end surface of the head 11 near the end of the shank 12 is perpendicular to the axis of the shank 12, and the side of the trimming screw root 42 away from the axis of the shank 12 forms a circle when projected onto the head 11 along the axial direction of the shank 12. The same applies to the circle formed by the axial projection of the inner screw root 41 onto the head 11.

[0038] It can be understood that the above-mentioned arrangement adopted in this embodiment can make the connection between the trimming screw root 42 and the inner screw root 41 a smooth transition, so that the outer screw peak 21 can move more smoothly when entering the trimming screw root 42 from the inner screw root 41, thereby ensuring the trimming effect of the trimming screw root 42 on the outer screw peak 21, and avoiding excessive driving force when the outer screw peak 21 re-enters the inner screw root 41 when the bolt 1 rotates in the reverse direction.

[0039] More specifically, the outer spiral peak 21 is configured to be edge-shaped.

[0040] like Figure 2 and Figure 3 As shown, in this embodiment, for example, the side of the outer crest 21 away from the axis of the rod 12 is configured as an edge. The inner root 41 can be configured to have the same shape as the outer crest 21. Since the inner root 41 and the outer crest 21 have the same radius when spirally arranged, in this embodiment, the outer crest 21 and the inner root 41 form the same two sets of helical lines when spirally arranged.

[0041] It can be understood that in this embodiment, the outer spiral peak 21 is set to an edge shape, which can make the outer spiral peak 21 more easily deformed when it is pressed, thereby improving the difference between the trimming screw root 42 and the outer spiral peak 21 before and after trimming, thereby further improving the trimming effect of the trimming screw root 42 on the outer spiral peak 21.

[0042] More specifically, the trimming screw root 42 is configured as an arc-shaped surface.

[0043] like Figure 2 and Figure 3 As shown, in this embodiment, the arcuate surface is exemplarily explained as a smooth curved surface, which can firstly ensure the stability and smoothness of the outer screw peak 21 when passing through the trimming screw root 42, and secondly, the arcuate surface can enable the trimming screw root 42 to trim the ridged outer screw peak 21 into an arc.

[0044] It can be understood that in this embodiment, the trimming screw root 42 is set as an arc surface, which can make the edge-shaped outer screw peak 21 be trimmed smoothly and smoothly into an arc shape, thereby further improving the difference between the trimming screw root 42 and the outer screw peak 21 before and after trimming, and can also make the arc-shaped outer screw peak 21 easier to re-enter the inner screw root 41 when the bolt 1 rotates in the reverse direction.

[0045] It should be noted that when the bolt 1 rotates in the reverse direction so that the arc-shaped outer thread peak 21 re-enters the inner thread root 41, the arc-shaped outer thread peak 21 often cannot completely recover to an angular shape. However, when it is subjected to backlog, it can still enter the inner thread root 41 due to its tendency to recover to an angular shape.

[0046] More specifically, the trimming screw root 42 is configured to be conical along the direction of its spiral configuration, with a small end communicating with the inner screw root 41 and a large end extending to the outside of the nut 3 .

[0047] like Figure 2 As shown, in this embodiment, for example, the arcuate surface of the trimming screw 42 is configured as a cone along the direction in which it is spirally arranged. Since the inner thread 41 is configured as an edge, the small end of the trimming screw 42 is configured as a cone tip, and the cone tip intersects the edge of the inner thread 41. The large end of the trimming screw 42 spirally extends to the outside of the nut 3.

[0048] It can be understood that in this embodiment, the trimming screw root 42 is set to a cone shape, so that after the outer screw peak 21 enters the trimming screw root 42, the process of its edge being trimmed and deformed is a gradual process. This not only improves the trimming effect of the trimming screw on the outer screw peak 21, but also reduces the driving force required to pass the bolt 1 through the nut 3 or rotate the bolt 1 in reverse to allow the outer screw peak 21 to re-enter the inner screw root 41.

[0049] More specifically, the inner screw root 41 passes through the middle of the trimming screw root 42 when being spirally arranged.

[0050] like Figure 2 As shown, in this embodiment, it is exemplified that the spiral line formed by the spiral setting of the edge of the inner screw root 41 passes through the middle of the arcuate surface of the trimming screw root 42, that is, the two side edges of the arcuate surface of the trimming screw root 42 are distributed on both sides of the spiral line formed by the spiral setting of the edge of the inner screw root 41.

[0051] It is understandable that the above arrangement is adopted in this embodiment, so that the trimming screw root 42 can squeeze both sides of the outer spiral peak 21 at the same time, thereby stably and effectively driving the outer spiral peak 21 to be trimmed into an arc shape.

[0052] Specifically, the surface of the trimming screw root 42 is provided with a titanium carbide nitride coating.

[0053] In this embodiment, it is exemplified that the carbon element added to the titanium carbide nitride coating can increase the hardness of the trimming screw root 42, so that the trimming screw root 42 has lower internal stress and higher toughness, and can also obtain better surface lubricity to reduce the friction coefficient.

[0054] It can be understood that this embodiment provides a titanium nitride carbide coating on the arcuate surface of the trimming screw root 42, which can further increase the hardness difference between the trimming screw root 42 and the outer screw peak 21, thereby making the trimming screw root 42 less likely to deform and effectively trimming the outer screw peak 21.

[0055] It can also be understood that the titanium carbide nitride coating can further improve the stability and smoothness of the outer screw peak 21 when passing through the trimming screw root 42.

[0056] Specifically, the external thread 2 further includes a spirally arranged external thread root 22, and the internal thread 4 further includes a spirally arranged internal thread crest 43. The spirally arranged radii of the external thread root 22 and the internal thread crest 43 are equal.

[0057] like Figure 2 and Figure 3As shown, in this embodiment, it is exemplified that the external thread root 22 is the portion of the external thread 2 close to the axis of the rod 12, and the internal thread peak 43 is the portion of the internal thread 4 close to the axis of the nut 3. The radii of the spiral settings of the external thread root 22 and the internal thread peak 43 are equal, which can be understood as: the radius of the spiral setting on the side closest to the axis of the rod 12 is equal to the radius of the spiral setting on the side closest to the axis of the nut 3.

[0058] It can be understood that in this embodiment, the radii of the spiral settings of the external thread root 22 and the internal thread peak 43 are set to be equal, so that the external thread 2 and the internal thread 4 can also form limited positions at the external thread root 22 and the internal thread peak 43, thereby improving the strength and stability of the threaded connection between the bolt 1 and the nut 3.

[0059] More specifically, the external thread 2 also includes a pair of external screw ribs 23 extending between the external screw peak 21 and the external screw root 22, and the internal thread 4 also includes a pair of internal screw ribs 44 arranged between the internal screw root 41 and the internal screw peak 43. The pair of external screw ribs 23 corresponds to the pair of internal screw ribs 44 one by one, and both are in face-to-face contact.

[0060] like Figure 2 and Figure 3 As shown, in this embodiment, the outer crest 21 and outer root 22 of the external thread 2 and the inner root 41 and inner crest 43 of the internal thread 4 are all arranged in sequence along the axial direction, and a pair of outer ribs 23 are spirally arranged between the outer crest 21 and the outer root 22 to connect the outer crest 21 and the outer root 22, and a pair of inner ribs 44 are spirally arranged between the inner root 41 and the inner crest 43 to connect the inner root 41 and the inner crest 43. The pair of outer ribs 23 correspond to the pair of inner ribs 44 one-to-one and contact each other in a face-to-face manner. In this embodiment, when the trimming root 42 corrects the outer crest 21 and the outer crest 21 has an edge that becomes arc-shaped, the area of the pair of outer ribs 23 decreases.

[0061] It can be understood that in this embodiment, the pair of outer screw bellies 23 correspond to the pair of inner screw bellies 44 one by one, and are in surface-to-surface contact, which can further improve the strength and stability of the threaded connection between the bolt 1 and the nut 3.

[0062] More specifically, the line segments formed by the pair of outer spiral bellies 23 in the axial cross section of the rod portion 12 are obliquely arranged on both sides of a horizontal line.

[0063] like Figure 3As shown, in this embodiment, for example, the pair of outer spiral bellies 23 are formed with two inclined line segments in the axial cross section of the rod portion 12. The two line segments are spirally arranged to form the surfaces of the pair of outer spiral bellies 23. In this embodiment, the two line segments intersect, and the intersection is located on the spiral line formed by the outer spiral peak 21.

[0064] It can be understood that the above-mentioned arrangement is adopted in this embodiment, so that the pair of outer spiral bellies 23 have gradually widened bearing portions along the direction close to the axis of the rod portion 12, so that when the outer spiral peak 21 is trimmed by the trimming screw root 42, the outer spiral bellies 23 are not prone to abnormal deformation and affect the entry of the bolt 1 into the nut 3.

[0065] The implementation principle of the anti-loosening combination bolt member provided in this embodiment is:

[0066] When bolt 1 is threadedly connected to nut 3, the outer thread crest 21 enters through the inner thread root 41, then passes through the inner thread root 41 and into the trimming thread 42, finally passing through the trimming thread 42 and passing through the nut 3. As the outer thread crest 21 passes through the trimming thread 42, the trimming thread 42 gradually trims the ridged outer thread crest 21 into a curved shape. When bolt 1 is rotated in the reverse direction, the curved outer thread crest 21 re-enters the inner thread root 41, requiring greater driving force to be applied to the bolt 1, thereby preventing loosening.

[0067] When at least two components are locked and fixed by the anti-loosening combination bolt provided by this embodiment, it is only necessary to thread the bolt 1 and the nut 3, avoiding the addition of additional assembly steps, simple operation, low assembly difficulty, and short assembly time.

[0068] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An anti-loosening combination bolt, characterized in that: The anti-loosening combination bolt member comprises: A bolt (1) comprising a head (11) and a shank (12), wherein the head (11) and the shank (12) are coaxially arranged and connected, and the circumference of the shank (12) is provided with an external thread (2), wherein the external thread (2) comprises a spirally arranged external thread peak (21); and A nut (3) is provided with an internal thread (4), wherein the internal thread (4) includes a spirally arranged internal thread root (41), wherein the internal thread root (41) and the external thread crest (21) have the same radius as each other, so as to threadably connect the nut (3) to the rod (12); Wherein, the bolt (1) and the nut (3) are both made of metal material, and the hardness of the bolt (1) is less than that of the nut (3), and the internal thread (4) further comprises a spirally arranged trimming screw root (42), wherein the trimming screw root (42) is arranged at one end of the nut (3) away from the head (11), and one end is connected to the internal thread root (41), and the other end extends to the outside of the nut (3), the axis of the spiral arrangement of the trimming screw root (42) is eccentric to the axis of the spiral arrangement of the internal thread root (41), and the radius of the spiral arrangement of the trimming screw root (42) is smaller than the radius of the spiral arrangement of the internal thread root (41), and when the external thread peak (21) moves from the internal thread root (41) to the trimming screw root (42), it is trimmed and deformed; The outer spiral peak (21) is configured as an edge; The trimming screw root (42) is configured as an arc-shaped surface.

2. The anti-loosening combination bolt according to claim 1, characterized in that: The circle formed by axially projecting the trimming screw root (42) onto the head (11) is tangent to the circle formed by axially projecting the inner screw root (41) onto the head (11).

3. The anti-loosening combination bolt according to claim 2, characterized in that: The trimming screw root (42) is arranged in a conical shape along the direction of its spiral arrangement, and the small end is connected to the inner screw root (41), and the large end extends to the outside of the nut (3).

4. The anti-loosening combination bolt according to claim 3, characterized in that: The inner screw root (41) passes through the middle of the trimming screw root (42) when the inner screw root (41) is spirally arranged.

5. The anti-loosening combination bolt according to claim 1, characterized in that: The surface of the trimming screw root (42) is provided with a titanium carbide nitride coating.

6. The anti-loosening combination bolt according to claim 1, characterized in that: The external thread (2) further comprises a spirally arranged external thread root (22), and the internal thread (4) further comprises a spirally arranged internal thread peak (43), and the spirally arranged radii of the external thread root (22) and the internal thread peak (43) are equal.

7. The anti-loosening combination bolt according to claim 6, characterized in that: The external thread (2) further includes a pair of external screw ribs (23) extending between the external screw crest (21) and the external screw root (22), and the internal thread (4) further includes a pair of internal screw ribs (44) arranged between the internal screw root (41) and the internal screw crest (43). The pair of external screw ribs (23) corresponds to the pair of internal screw ribs (44) in a one-to-one correspondence and are in surface-to-surface contact with each other.

8. The anti-loosening combination bolt according to claim 7, characterized in that: The line segments formed by the pair of outer spiral bellies (23) on the axial cross section of the rod (12) are respectively arranged obliquely on both sides of the horizontal line.

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