A bolt for cooperating with a wedge thread nut

Abstract

The present application relates to the technical field of fastener, in particular to a bolt used in cooperation with a wedge thread nut, the thread section of the bolt comprises a common thread section and a avoiding thread section, the thread teeth of the common thread section and the thread teeth of the avoiding thread section both have wedge inclined surface corresponding parts used in correspondence with the wedge inclined surface of the wedge thread nut, the wedge inclined surface corresponding part of the common thread section is used in top pressure contact with the wedge inclined surface of the wedge thread nut, the wedge inclined surface corresponding part of the avoiding thread section is lower than the wedge inclined surface corresponding part of the common thread section, the wedge inclined surface corresponding part of the avoiding thread section is used in interval opposite with the wedge inclined surface of the wedge thread nut so that the tooth top of the avoiding thread section is set in interval with the wedge inclined surface of the wedge thread nut; the effective friction length of the thread cooperation can be reduced, the accumulation of metal chips generated by friction can be solved, the sticking and seizure phenomenon is not easy to occur, and it is beneficial to the normal tightening and unscrewing of the wedge thread nut and the bolt.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fasteners, in particular to a bolt for cooperating with a wedge thread nut. BACKGROUND

[0002] The wedge thread self-locking nut is a kind of fastener with high locking performance, which is widely used in the fields of aviation, railway, bridge and automobile. Figure 1 As shown in the figure, the wedge thread nut 1 has a 30° wedge inclined surface 11 at the root of its internal thread, and the thread tooth of the ordinary bolt 2 has a wedge inclined surface corresponding part corresponding to the wedge inclined surface 11, when the bolt nut is tightened, the wedge inclined surface corresponding part of the thread tooth top of the ordinary bolt is tightly pressed on the wedge inclined surface of the internal thread of the wedge thread nut, thereby generating a large locking force, due to the change of the angle of the tooth type, the normal force generated by the contact surface between the threads is 60° to the bolt axis, instead of 30° as in the ordinary thread, obviously, the radial centripetal force is much larger than the axial tightening pressure, therefore, the generated anti-loosening friction is necessarily greatly increased, the wedge thread nut directly cooperates with the external thread to achieve excellent self-locking performance, which greatly enhances the tightening force that cannot be compared with any standard thread fastener, and occupies an unshakable position in the similar industry.

[0003] For some equipment using wedge thread self-locking nuts, during the long-time operation, the wedge thread self-locking nut and the bolt need to be tightened and unscrewed many times, and due to the wedge thread of the wedge thread nut directly and rigidly cooperating with the ordinary external thread of the bolt, the contact friction is large, the friction generates metal chips, and the materials of the wedge thread nut and the bolt are usually similar, the friction generates heat and mutual melting, under the influence of product material properties, pressure and friction, the more metal chips are generated by the friction, the closer to the tail, and finally the metal chips accumulate, resulting in the easy occurrence of adhesion phenomenon at the threaded connection part, and even the serious occurrence of seizure and thread pull-out phenomenon, which affects the normal tightening and unscrewing, and affects the use of the wedge thread nut product. SUMMARY

[0004] The purpose of the present application is to provide a bolt for cooperating with a wedge thread nut, to solve the problem that the existing ordinary bolt is easy to cause adhesion and seizure phenomenon when cooperating with the wedge thread nut, thereby affecting the use of the product.

[0005] The technical scheme of the bolt for cooperating with the wedge thread nut of the present application is:

[0006] The utility model provides a bolt for cooperating with wedge thread nut, including screw rod part, which is equipped with threaded section, threaded section includes common thread section and avoidance thread section, avoidance thread section is located in the end of screw rod part, and the thread of common thread section and the thread of avoidance thread section all have wedge inclined plane corresponding part for corresponding with the wedge inclined plane of wedge thread nut, the wedge inclined plane corresponding part of common thread section is used for being pressed contact with the wedge inclined plane of wedge thread nut, and the wedge inclined plane corresponding part of avoidance thread section is lower than the wedge inclined plane corresponding part of common thread section, and the wedge inclined plane corresponding part of avoidance thread section is used for being spaced opposite with the wedge inclined plane of wedge thread nut to make the tooth top of avoidance thread section be spaced with the wedge inclined plane of wedge thread nut.

[0007] Beneficial effect: by setting common thread section and avoidance thread section on the bolt, and making the wedge inclined plane corresponding part of avoidance thread section lower than the wedge inclined plane corresponding part of common thread section, when the wedge thread nut is connected with the bolt, the wedge thread nut is screwed from avoidance thread section to common thread section, when the wedge thread nut passes through avoidance thread section, because the wedge inclined plane corresponding part of avoidance thread section is low in height, so that the tooth top of avoidance thread section and the wedge inclined plane of wedge thread nut have interval, can form avoidance to the wedge thread nut, avoid rigid contact friction, and after the wedge thread nut is screwed on common thread section, the wedge inclined plane corresponding part of common thread section can be pressed contact with the wedge inclined plane of wedge thread nut, so that under the condition of guaranteeing that the wedge thread nut is normally locked with the bolt, the effective friction length of threaded cooperation is reduced, the interval between the tooth top of avoidance thread section and the wedge inclined plane of wedge thread nut can resolve the accumulation of metal chips generated by friction, the bolt is not easy to stick and seize when cooperating with the wedge thread nut, which is beneficial to the normal tightening of the wedge thread nut and the bolt.

[0008] Further, the tooth top of the avoidance thread section is an inclined surface, with a reference surface being a surface passing through the bolt axis, the reference surface and the tooth top having an intersection line, the intersection line being disposed at an angle to the bolt axis, the tooth top of the avoidance thread section having a first portion and a second portion distributed along the axial direction of the bolt, the first portion being lower than the second portion, and the first portion being used to form the wedge inclined plane corresponding part of the avoidance thread section.

[0009] Beneficial effect: by making the tooth top of the avoidance thread section an inclined surface, the tooth top of the avoidance thread section has a low-height portion to form the wedge inclined plane corresponding part of the avoidance thread section, facilitating processing.

[0010] Further, the number of thread teeth on the avoidance thread section is two or more.

[0011] Beneficial effect: facilitating to increase the length of the avoidance thread section, and further reducing the effective friction length of the threaded cooperation of the bolt and the wedge thread nut.

[0012] Further, the crests of the thread teeth of the avoiding thread section are coplanar.

[0013] Beneficial effect: The crests of the thread teeth of the avoiding thread section are coplanar, which facilitates the formation of the inclined surface of the crests of the thread teeth by one-time machining.

[0014] Further, the diameter of the avoiding thread section gradually increases in the direction close to the normal thread section.

[0015] Beneficial effect: The avoiding thread section gradually increases in the direction close to the normal thread section, thereby guiding the wedge-shaped nut when being screwed from the avoiding thread section to the normal thread section, and facilitating the tightening and loosening.

[0016] Further, the crests of the thread teeth of the avoiding thread section are lower than the crests of the thread teeth of the normal thread section.

[0017] Beneficial effect: The avoiding thread section is formed by cutting off part of the thread of the bolt. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of the thread cooperation structure of the normal bolt and the wedge-shaped nut in the prior art;

[0019] Figure 2 It is a schematic diagram of the structure of the bolt for cooperation with the wedge-shaped nut according to the present application;

[0020] Figure 3 It is a schematic diagram of the structure of the part close to the tail end of the bolt for cooperation with the wedge-shaped nut according to the present application;

[0021] Figure 4 It is a schematic diagram of the thread cooperation structure of the bolt for cooperation with the wedge-shaped nut according to the present application and the wedge-shaped nut.

[0022] In the figure: 1, wedge-shaped nut; 11, wedge-shaped inclined surface; 2, normal bolt; 3, anti-blocking bolt; 31, avoiding crest. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present application more clear and explicit, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and are not used to limit the present application, i.e., the described examples are only a part of the examples of the present application, but not all the examples. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0024] The following detailed description of embodiments of the application in the drawings provided is not intended to limit the scope of the application as claimed, but merely represents selected embodiments of the application. Based upon the embodiments of the application, all other embodiments that would be obvious to those skilled in the art without doing creative work are within the scope of the application.

[0025] It should be noted that the relationship terms such as "first" and "second" and the like that can appear in the specific embodiments of the application are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms such as "include", "contain" or any other variants that can appear are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the elements defined by the possible appearing statements "include a" and the like do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0026] In the description of the application, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connect" that can appear should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0027] In the description of the application, unless otherwise explicitly specified and limited, the term "provided with" that can appear should be understood broadly, for example, the object "provided with" can be part of the body, or arranged separately from the body and connected to the body, which connection can be detachable or non-detachable. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0028] The application is further described in detail below in combination with embodiments.

[0029] Embodiment 1 of the bolt for cooperating with the wedge thread nut of the application:

[0030] As Figure 2 , Figure 3 , Figure 4As shown, the bolt for cooperating with the wedge thread nut 1, i.e. the anti-blocking bolt 3, includes a bolt head and a bolt shank, the bolt shank includes an axially extending smooth shank portion and a screw portion, the bolt head is arranged at one end of the smooth shank portion, the screw portion is arranged at the other end of the smooth shank portion, the screw portion is provided with a threaded segment, the threaded segment includes an ordinary threaded segment and an avoidance threaded segment distributed along the axial direction, the ordinary threaded segment is used for locking cooperation with the wedge thread nut 1, and the avoidance threaded segment is used for avoiding the wedge inclined surface 11 of the wedge thread nut 1 when the wedge thread nut 1 is screwed, so as to reduce the friction.

[0031] The avoidance threaded segment of the anti-blocking bolt 3 is located at the end of the bolt shank away from the bolt head, i.e. the threaded tail of the anti-blocking bolt 3. The thread of the avoidance threaded segment has three flanks, i.e. the number of thread teeth on the avoidance threaded segment is three, each thread tooth has a tooth top, the tooth top of the avoidance threaded segment is an avoidance tooth top 31, the avoidance tooth top 31 is lower than the tooth top of the ordinary threaded segment, so that when the wedge thread nut 1 is threadedly connected on the avoidance threaded segment, the avoidance tooth top 31 does not contact the wedge inclined surface 11 of the wedge thread nut 1.

[0032] The avoidance tooth top 31 is an inclined surface, taking the surface intersecting the axis of the anti-blocking bolt 3 as a reference surface, the reference surface and the tooth top have an intersection line, the avoidance tooth top 31 is inclined to the reference surface, and the intersection line between the reference surface and the tooth top is a vertical intersection line, as shown in Figure 2 the up-down direction of the avoidance tooth top 31 is the vertical direction of the anti-blocking bolt 3, the reference surface in the vertical direction is a vertical reference surface, and the intersection line between the vertical reference surface and the tooth top is a vertical intersection line, as shown in Figure 3 the angle between the vertical intersection line and the axis of the anti-blocking bolt 3 is a.

[0033] The avoidance tooth top 31 has a first part and a second part distributed along the axial direction of the anti-blocking bolt 3, the first part is lower than the second part, and the first part is used to form a wedge inclined surface corresponding part of the avoidance threaded segment, the wedge inclined surface corresponding part of the avoidance threaded segment is used to be spaced apart from the wedge inclined surface 11 of the wedge thread nut 1, so that the tooth top of the avoidance threaded segment is spaced apart from the wedge inclined surface 11 of the wedge thread nut 1.

[0034] The tooth top of each thread tooth of the avoidance threaded segment is coplanar and on the same conical surface, and in the direction close to the ordinary threaded segment, the large diameter size of the avoidance threaded segment gradually increases, the tooth top height of the thread tooth on the avoidance threaded segment gradually increases, the height direction of the tooth top is the radial direction of the anti-blocking bolt 3, and the height of the tooth top refers to the height relative to the axis of the anti-blocking bolt 3. By setting the tooth top of the avoidance threaded segment as an inclined surface and making the tooth top of each thread tooth of the avoidance threaded segment coplanar, it is convenient to process by turning once, and a part of the thread tooth of the ordinary threaded tooth is removed to form the thread tooth of the avoidance threaded segment. At the same time, since the avoidance threaded segment becomes thick from thin in the direction close to the ordinary threaded segment, the wedge thread nut 1 can be guided when being screwed from the avoidance threaded segment to the ordinary threaded segment, and it is convenient to tighten and unscrew.

[0035] The thread of the common thread section is used to rigidly abut with the wedge-shaped inclined surface 11 of the wedge-shaped thread nut 1, and the common thread section is not subjected to the cutting treatment relative to the avoiding thread section. Since the thread of the anti-blocking bolt 3 is trapezoidal thread, the crest of the common thread section is flat, and the part of the crest of the common thread section used to contact the wedge-shaped inclined surface 11 of the wedge-shaped thread nut 1 constitutes the wedge-shaped inclined surface corresponding part of the common thread section. The wedge-shaped inclined surface corresponding part of the avoiding thread section is lower than the wedge-shaped inclined surface corresponding part of the common thread section.

[0036] In use, the wedge-shaped thread nut 1 is threadedly connected to the anti-blocking bolt 3, and is screwed from the avoiding thread section to the common thread section. When the wedge-shaped thread nut 1 passes through the avoiding thread section, the crest of the avoiding thread section is spaced from the wedge-shaped inclined surface 11 of the wedge-shaped thread nut 1 due to the lower height of the wedge-shaped inclined surface corresponding part of the avoiding thread section, so that the wedge-shaped thread nut 1 is avoided to be in rigid contact with the wedge-shaped inclined surface 11 of the wedge-shaped thread nut 1. After the wedge-shaped thread nut 1 is screwed to the common thread section, the wedge-shaped inclined surface corresponding part of the common thread section can be in contact with the wedge-shaped inclined surface 11 of the wedge-shaped thread nut 1, so as to ensure the locking of the wedge-shaped thread nut 1 and the anti-blocking bolt.

[0037] The avoiding thread section subjected to the cutting treatment is located at the tail region of the anti-blocking bolt 3, and the tail of the bolt is usually threaded out of the nut and is not threadedly connected with the nut. In normal use of the bolt and nut, the tail region of the bolt does not play a fastening role, but is a normal friction part when repeatedly tightened and threaded out. Therefore, the region is chamfered to form the avoiding thread section with a smaller diameter, which has no influence on the normal use and can form a larger gap between the bolt and the nut at the tail, so as to shorten the effective friction length of the bolt in the thread of the wedge-shaped thread nut. The larger gap at the tail can also alleviate the metal chips generated by the friction of the common thread section, so that the metal chips are not easily accumulated. The repeatedly tightening and threading out refers to repeatedly tightening and separating the bolt and the nut. In this way, the bolt is not easily subjected to thread adhesion and seizure due to extrusion deformation when cooperating with the wedge-shaped thread nut, and has the advantages of convenient use, frequent tightening and threading out, etc., which is beneficial to the use reliability of the wedge-shaped thread nut and the bolt.

[0038] Embodiment 2 of the bolt for cooperating with the wedge-shaped thread nut of the present application:

[0039] The difference between the present embodiment and embodiment 1 is that the crest of the avoiding thread section is lower than the crest of the common thread section in embodiment 1. In the present embodiment, the crest of the avoiding thread section comprises a flat part and an inclined part, the flat part is flush with the crest of the common thread section, and the inclined part is lower than the flat part. The inclined part constitutes the wedge-shaped inclined surface corresponding part of the avoiding thread section, and the inclined part of the crest of the avoiding thread section is formed by chamfering one side edge of the crest.

[0040] Embodiment 3 of the bolt for cooperating with the wedge thread nut of the present application:

[0041] The difference between this embodiment and embodiment 1 is that the tooth top of the thread avoidance section is a plane, and the tooth top of the thread avoidance section is parallel to the tooth top of the normal thread section.

[0042] Embodiment 4 of the bolt for cooperating with the wedge thread nut of the present application:

[0043] The difference between this embodiment and embodiment 1 is that the tooth top of the thread avoidance section is a plane, and the tooth top of the thread avoidance section is parallel to the tooth top of the normal thread section.

[0044] Finally, it should be noted that the above only describes the preferred embodiments of the present application, and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments without creative labor, or make equivalent replacement for part of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A bolt for cooperation with a wedge thread nut, comprising a shank portion, on which a threaded section is provided, characterized in that, The thread section includes a normal thread section and a relief thread section, the relief thread section is located at the end of the screw section, the thread of the normal thread section and the thread of the relief thread section both have wedge-shaped slope corresponding parts for corresponding with the wedge-shaped slope of the wedge-shaped thread nut, the wedge-shaped slope corresponding part of the normal thread section is used for top pressure contact with the wedge-shaped slope of the wedge-shaped thread nut, the wedge-shaped slope corresponding part of the relief thread section is lower than the wedge-shaped slope corresponding part of the normal thread section, the wedge-shaped slope corresponding part of the relief thread section is used for spacing relative to the wedge-shaped slope of the wedge-shaped thread nut so that the tooth top of the relief thread section is arranged in space with the wedge-shaped slope of the wedge-shaped thread nut, the thread of the normal thread section is trapezoidal thread, the tooth top of the normal thread section is a plane, the thread of the relief thread section is formed by cutting a part of the normal thread tooth, the tooth top of the relief thread section is lower than the tooth top of the normal thread section, the tooth top of the thread of the relief thread section is a conical surface structure, the number of the thread of the relief thread section is more than two, the tooth top of each thread of the relief thread section is coplanar and on the same conical surface, in the direction close to the normal thread section, the large diameter size of the relief thread section gradually increases, the relief thread section is located at the tail part of the bolt which is out of the nut during normal use and does not have a fastening effect.

2. A bolt for mating with a wedge thread nut as claimed in claim 1, characterised in that, The face passing through the bolt axis is used as a reference face, the reference face and the tooth top have an intersection line, the intersection line is arranged at an angle with the bolt axis, the tooth top of the relief thread section has a first part and a second part which are distributed along the axial direction of the bolt, the first part is lower than the second part, and the first part is used to form the wedge-shaped slope corresponding part of the relief thread section.

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