CN215293179U - Anti-loosening thread structure with axially-offset threads - Google Patents

Abstract

The utility model provides a locking thread structure with axial skew thread, belongs to mechanical basic spare part technical field, including a set of conventional thread and at least one skew thread, a set of conventional thread and at least one skew thread are the heliciform and set up on the bolt to a set of conventional thread and at least one skew thread all mesh with the thread of nut, the pitch of a set of conventional thread is the same, the skew thread is to adjacent conventional thread one side skew on the bolt axis direction, during the assembly, the thread on skew thread and the nut is interfered. The utility model discloses a locking thread structure with axial skew thread has changed traditional dependence gasket or has carried out locking problem between the fastener through the thread gluing, through the change in the helicitic texture for part of screw thread changes on the pitch among them, thereby can interfere with the thread of nut, reaches locking effect, design benefit, locking effectual.

Description

Anti-loosening thread structure with axially-offset threads

Technical Field

The utility model belongs to the technical field of mechanical basis spare part, specifically, relate to a locking thread structure with axial skew thread.

Background

Among the common fastening components, a bolt is a component that is widely used. For example, the function of the device is not reflected everywhere in various fields such as machinery, electric power, automobiles, railways, aviation, navigation, military and the like. Especially in strong vibration and irregular strong force fluctuation, bolt loosening and falling phenomena often occur, unsafe accidents are caused, normal operation and use of machinery, vehicles and the like are seriously influenced, and meanwhile, great loss is caused to national economy.

In the prior art, the following methods are generally used to prevent loosening of the fastener:

1. the spring washer is adopted, the flat gasket and the inclined opening are penetrated on the part close to the head of the nut, the auxiliary thread shaft is tensioned axially by utilizing the elastic deformation of the spring washer, and the anti-loosening effect is realized by utilizing the resisting action of the inclined opening of the washer, but the anti-loosening effect is not ideal in the high-frequency, severe and long-time vibration of vibration equipment;

2. the method adopts a permanent anti-loosening method, namely, methods such as welding, punching and the like are adopted to eliminate relative transfer of a thread pair, and although the method is reliable in anti-loosening, when the method needs to be disassembled, the connecting piece or the connected piece is easy to damage;

3. the split pin is used, and although the anti-loosening effect is good, the bolt needs to be drilled, and particularly, the drilling at which position of the bolt needs to be preset in advance, so that the split pin cannot be widely applied;

4. the stop pad is used, but the stop pad bears less loosening torque.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: the utility model aims at providing a locking thread structure with axial skew thread has solved carrying out locking through increasing the gasket among the prior art, and the locking effect of fastener is unsatisfactory, often not hard up, perhaps adopts the dead fixed mode of lock to prevent loosing, but the very inapplicable problem of occasion at needs dismantlement.

The technical scheme is as follows: the utility model provides a locking thread structure with axial skew thread, including a set of conventional thread and at least one skew thread, a set of conventional thread and at least one skew thread are the heliciform setting on the bolt to a set of conventional thread and at least one skew thread all mesh with the thread of nut, the pitch of a set of conventional thread is the same, the skew thread is to adjacent conventional thread one side skew on the bolt axis direction, the skew thread interferes with the thread on the nut. The utility model discloses a locking thread structure with axial skew thread has changed traditional dependence gasket or has carried out locking problem between the fastener through the thread gluing, through the change in the helicitic texture for part of screw thread changes on the pitch among them, thereby can interfere with the thread of nut, reaches locking effect, design benefit, locking effectual.

Further, in the above anti-loose thread structure having axially offset threads, the set of regular threads and the at least one offset thread are formed by twice thread rolling, and the offset threads may be thread rolled by applying pressure through a thread rolling die. The structure of the anti-loose screw thread is formed by twice thread rolling, wherein in the process of the second thread rolling, the step of applying pressure is carried out while the thread rolling is carried out, and the conventional screw thread is twisted and deflected to form the offset screw thread.

Further, in the above-described anti-loosening thread structure having the axially offset threads, the pitch of the offset threads and the regular threads on one side is increased, and the pitch of the offset threads and the regular threads on the other side is decreased. Due to the offset of the offset thread in the axial direction, the thread pitch between the offset thread and the conventional thread on both sides changes, wherein the thread pitch on one side increases and the thread pitch on the other side decreases.

Further, in the above anti-loose thread structure having axially offset threads, the number of the at least one offset thread is two, and a conventional thread is disposed between the two offset threads. Through practice contrast and the intensity performance of combination bolt, the quantity of skew thread sets up to two and can reach the locking effect of best.

Further, in the above anti-loose thread structure with the axially offset thread, a boss is formed between the starting end of the offset thread in the offset direction and the bolt body, a concave platform is formed between the tail end of the offset thread in the offset direction and the thread bottom of the bolt, the boss interferes with the thread top of the nut thread, and the edge of the offset thread in the offset direction interferes with the thread of the nut.

Further, in the above anti-loose thread structure with axially offset threads, thread clearances exist between the conventional threads and the offset threads and the threads of the nut.

Further, the anti-loose thread structure with the axially offset threads is an arc-shaped boss of the boss.

Further, in the above anti-loosening thread structure having the axially offset threads, the thread form angle between the regular thread and the offset thread is 60 °.

Further, in the anti-loose thread structure with the axially offset threads, the distance between the offset thread offset point and the thread bottom of the bolt is 0.25-0.35 mm.

Furthermore, in the anti-loose thread structure with the axially offset threads, the offset distance of the offset threads along the spiral line direction is 0.13 mm-0.18 mm.

Above-mentioned technical scheme can find out, the utility model discloses following beneficial effect has: anti-loosening thread structure with axial skew thread, moreover, the steam generator is simple in structure, and reasonable, high durability and convenient use, low in application cost, adaptability is good, after the bolt is first rubbed with the hands and is formed conventional screw thread, rub with the hands and make it take place axial skew through the second time with the hands and make it, form the skew screw thread, at bolt and nut locking in-process, interfere between the thread of skew thread and nut, thereby reach the locking mesh of locking, this anti-loosening thread simple structure, need not to increase other locking forms (if increase the packing ring, scribble anti-loosening etc.) that are fit for the operating mode condition in the consideration beyond the bolt, locking effect is good, safe and reliable long service life, has very high spreading value.

Drawings

Fig. 1 is a schematic structural view of a check thread structure with axially offset threads according to the present invention;

fig. 2 is an enlarged view of a portion C of fig. 1 according to the present invention;

FIG. 3 is a schematic structural view of the anti-loosening threaded structure with axially offset threads according to the present invention;

fig. 4 is a partially enlarged view of a portion a in fig. 3 according to the present invention.

In the figure: regular thread 1, offset thread 2, boss 21, recess 22, thread clearance 3.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Example one

The anti-loose thread structure with axially offset threads as shown in fig. 1 and 2 comprises a group of regular threads 1 and at least one offset thread 2, wherein the group of regular threads 1 and the at least one offset thread 2 are spirally arranged on a bolt, the group of regular threads 1 and the at least one offset thread 2 are both meshed with the threads of a nut, the thread pitches of the group of regular threads 1 are the same, the offset thread 2 is offset to one side of the adjacent regular threads 1 in the axial direction of the bolt, and the offset thread 2 is interfered with the threads on the nut.

The screw pitch between a set of conventional thread 1 on the conventional bolt all is the same, the utility model discloses a locking thread structure a set of conventional thread 1 and at least one skew thread 2 form through twice thread rolling, 2 accessible thread rolling boards of skew thread are exerted pressure and are twisted the teeth. The pitch of the offset thread 2 formed with the conventional thread 1 on one side increases and the pitch of the offset thread 2 formed with the conventional thread 1 on the other side decreases. The first thread rolling is a normal set of conventional threads with a normal screw plate and the second thread rolling is at least one offset thread 2 with a screw plate under pressure.

Example two

Based on the structure of the embodiment, the number of the offset threads 2 is optimally two, and a conventional thread 1 is arranged between the two offset threads 2 in consideration of the height of the nut, the bearing capacity of the bolt and the nut matching and the anti-loosening performance. It is also possible to set the number of offset threads 2 to 1 and 3. The general nut and bolt meshing is limited in height, the meshing thread is generally about 5-6 threads, if too many threads are damaged and are set as offset threads 2 to ensure the anti-loosening effect, the bearing capacity of the bolt can be greatly influenced, so that through experimental verification, the thread rolling forms 2 offset threads 2, and a conventional thread 1 is arranged between the two offset threads 2, so that the optimal scheme of the anti-loosening thread is achieved. And a thread clearance 3 exists between the conventional thread 1 and the offset thread 2 and the thread of the nut.

In addition, the offset thread 2 forms a boss 21 between the start end of the offset direction and the bolt body, the offset thread 2 forms a recessed table 22 between the end of the offset direction and the root of the bolt, the boss 21 interferes with the crest of the nut thread, and the edge of the offset thread 2 in the offset direction interferes with the thread of the nut. The arc-shaped boss of the boss 21.

In addition, the profile angle between the regular thread 1 and the offset thread 2 is 60 °. And the distance between the offset point of the offset thread 2 and the bottom of the bolt tooth is 0.25-0.35 mm. The offset distance of the offset thread 2 along the spiral line direction is 0.13 mm-0.18 mm.

As shown in fig. 3 and 4, when the bolt and the nut are applied in a matched manner, the nut needs to be screwed in by using a corresponding torque tool, the torque of the bolt and the nut with the anti-loosening threaded structure is larger than that of a common bolt when the bolt and the nut with the anti-loosening threaded structure are matched, and the anti-loosening effect is achieved through interference between the bolt and the nut with the anti-loosening threaded structure.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications can be made without departing from the principles of the present invention, and these modifications should also be regarded as the protection scope of the present invention.

Claims (10)

1. A check thread structure with axially offset threads is characterized in that: including a set of conventional thread (1) and at least one skew thread (2), a set of conventional thread (1) and at least one skew thread (2) are the heliciform and set up on the bolt to a set of conventional thread (1) and at least one skew thread (2) all mesh with the thread of nut, the pitch of a set of conventional thread (1) is the same, skew thread (2) are to adjacent conventional thread (1) one side skew in bolt axis direction, skew thread (2) interfere with the thread on the nut.

2. The anti-loosening thread structure having axially offset threads as defined in claim 1, wherein: the set of conventional threads (1) and the at least one offset thread (2) are formed by two thread rolling operations, and the offset thread (2) can be thread rolled by applying pressure via a thread rolling die.

3. The anti-loosening thread structure with axially offset threads as claimed in claim 1 or 2, wherein: the pitch of the offset thread (2) and the conventional thread (1) on one side is increased, and the pitch of the offset thread (2) and the conventional thread (1) on the other side is decreased.

4. The anti-loosening thread structure having axially offset threads as defined in claim 1, wherein: the number of the at least one offset thread (2) is two, and a conventional thread (1) is arranged between the two offset threads (2).

5. The anti-loosening thread structure with axially offset threads as claimed in claim 1 or 4, wherein: the offset thread (2) forms a boss (21) between the starting end of the offset direction and the bolt body, the offset thread (2) forms a concave table (22) between the tail end of the offset direction and the thread bottom of the bolt, the boss (21) interferes with the thread top of the nut thread, and the edge of the offset direction of the offset thread (2) interferes with the thread of the nut.

6. The anti-loosening thread structure having axially offset threads as defined in claim 1, wherein: and a thread clearance (3) exists between the conventional thread (1) and the offset thread (2) and the thread of the nut.

7. The anti-loosening thread structure having axially offset threads as defined in claim 5, wherein: the arc-shaped boss of the boss (21).

8. The anti-loosening thread structure having axially offset threads as defined in claim 1, wherein: the profile angle between the regular thread (1) and the offset thread (2) is 60 °.

9. The anti-loosening thread structure having axially offset threads as defined in claim 1, wherein: the distance between the offset point of the offset thread (2) and the bottom of the bolt tooth is 0.25 mm-0.35 mm.

10. The anti-loosening thread structure with axially offset threads as claimed in claim 1 or 9, wherein: the offset distance of the offset thread (2) along the spiral line direction is 0.13 mm-0.18 mm.

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