CN216278875U - Anti-loosening fastener, threaded fastening kit and threaded fastening assembly - Google Patents
Anti-loosening fastener, threaded fastening kit and threaded fastening assembly Download PDFInfo
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- CN216278875U CN216278875U CN202122114609.XU CN202122114609U CN216278875U CN 216278875 U CN216278875 U CN 216278875U CN 202122114609 U CN202122114609 U CN 202122114609U CN 216278875 U CN216278875 U CN 216278875U
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Abstract
The utility model discloses an anti-loose fastener which is provided with a thread part, wherein the thread part is provided with at least two thread sections, all the thread sections have the same geometric parameters, the distance between the central lines of two adjacent tooth bottoms of any one thread section is a thread pitch, and the distance between the central line of the tooth bottom of any one thread section and the central line of the tooth bottom of the adjacent thread section is equal to a non-integral multiple of the thread pitch. Compared with the prior art, the anti-loosening fastener can effectively eliminate the fit clearance of the screw and the nut in the axial direction and the radial direction when the screw and the nut are in the locking state, prevent the screw from moving in the radial direction and the axial direction, and provide the axial pretightening force required by locking so as to achieve a good anti-loosening effect. Meanwhile, the utility model also provides a thread fastening kit applying the anti-loose fastener and a thread fastening assembly applying the thread fastening kit.
Description
Technical Field
The utility model relates to the technical field of anti-loose fastening, in particular to an anti-loose fastener, a threaded fastening kit and a threaded fastening assembly.
Background
The connecting or fastening of the workpieces is realized by utilizing the thread matching, and the connecting or fastening device has the advantages of simple structure, convenience in mounting and dismounting and the like, and is widely applied to the mechanical industry. As shown in fig. 1, this is a schematic diagram of a conventional screw 1 and a conventional nut 2 in a screwing process, and since a gap generally exists between the pitch diameter of the nut internal thread and the pitch diameter of the screw external thread, when the two are screwed, the thread upper side 21 of the nut internal thread is in a contact stress state with the thread surface 11 of the screw, and the thread lower side 22 of the nut internal thread is separated from the thread surface of the screw. Under the condition, the inner thread profile of the nut is in a unidirectional stress state, and after the screw and the nut are in threaded connection for a period of time, the inner thread profile of the nut is easily separated from the thread surface of the screw due to lasting vibration or the fatigue limit of materials, so that the pretightening force of the screw gradually disappears, and the nut is loosened. In order to solve the problem of loosening of the nut, it is necessary to improve the structure of the existing fastener so that the fastener has good loosening prevention performance.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to a loose-proof fastener that solves one or more of the problems set forth in the prior art, and that provides at least one useful alternative or creation.
The anti-loose fastener is provided with a thread part, the thread part is provided with at least two thread sections, all the thread sections have the same geometric parameters, the distance between two adjacent root center lines of any one thread section is a thread pitch, and the distance between the root center line of any one thread section and the root center line of the adjacent thread section is equal to a non-integral multiple of the thread pitch.
The anti-loose fastener provided by the embodiment of the utility model has at least the following beneficial effects: the anti-loosening fastener can be an anti-loosening screw or an anti-loosening nut, and because the distance between the tooth bottom central line of any one thread section and the tooth bottom central line of the adjacent thread section is equal to a non-integral multiple of thread pitch, namely, the two adjacent thread sections have position dislocation in the axis direction, after the anti-loosening fastener is in threaded connection with a common fastener, the upper tooth-shaped side surface of one thread section and the thread surface of the common fastener are in a contact stress state, the lower tooth-shaped side surface of the thread section and the thread surface of the common fastener are in a separation state, and at the moment, the thread section mainly bears the axial pre-tightening force required by fastening; along with the gradual locking of the nut or the screw, the lower side surface of the tooth form of the other thread section is in a contact stress state with the thread surface of the common fastener, and the upper side surface of the tooth form of the thread section is in a separation state with the thread surface of the common fastener. Compared with the prior art, the anti-loosening fastener can effectively eliminate the fit clearance of the screw and the nut in the axial direction and the radial direction when the screw and the nut are in the locking state, prevent the screw from moving in the radial direction and the axial direction, and provide the axial pretightening force required by locking so as to achieve a good anti-loosening effect.
According to some embodiments of the present invention, in order to facilitate machining of different thread segments, the thread segment is provided with a relief between each adjacent two thread segments.
According to some embodiments of the present invention, in order to achieve the position misalignment of two adjacent thread segments in the axial direction, the shortest straight line between the tooth starting point of any one thread segment and the central axis of the thread segment is a tooth starting line, and the tooth starting lines of each two adjacent thread segments are not parallel to each other, so that the projections of the tooth starting lines of each two adjacent thread segments on the radial plane form an included angle with an angle α, and the value of α is positively correlated with the axial pre-tightening force required for locking.
According to some embodiments of the utility model, the threaded portion is an internal thread, in which case the loose-proof fastener is a loose-proof nut.
According to some embodiments of the utility model, the threaded portion is an external thread, and in this case, the locking fastener is a locking screw, a locking bolt, or a locking stud.
According to some embodiments of the utility model, the threaded portion is a one-step molding member which can be formed by one-step clamping machining, so that the production time and the production cost of the anti-loose fastener are saved.
According to some embodiments of the present invention, in order to save production time and production cost of the loose proof fastener, the number of the thread segments is two.
According to some embodiments of the utility model, in order to further improve the anti-loosening performance of the anti-loosening fastener, the number of the thread segments is three or more, and all the thread segments are arranged in a form of bamboos between clubs.
The threaded fastening kit according to the second aspect of the embodiment of the utility model comprises a common fastener and the anti-loose fastener, wherein the anti-loose fastener is in threaded connection with the common fastener.
The threaded fastening kit provided by the embodiment of the utility model has at least the following beneficial effects: if the anti-loose fastener is the anti-loose nut, the common fastener is the common screw, if the anti-loose fastener is the anti-loose screw, the common fastener is the common nut, and the anti-loose fastener can be in threaded connection with the common fastener which is generally used on the market, so that the use cost is effectively reduced.
According to the third aspect of the utility model, the threaded fastening assembly comprises at least two workpieces and the threaded fastening kit, wherein at least one workpiece is provided with a mounting hole for a screw to pass through, and all the workpieces are located between the anti-loose fastener and the common fastener.
The threaded fastening assembly provided by the embodiment of the utility model has at least the following beneficial effects: because the thread fastening sleeve has good anti-loosening performance, the thread fastening sleeve can ensure the locking connection between the workpieces so as to reduce the probability of safety accidents.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic view of a prior art screw and nut in threaded connection;
FIG. 2 is a partial cross-sectional view of a locknut of an embodiment of the present invention;
FIG. 3 is a schematic thread-up view of two adjacent thread segments according to an embodiment of the present invention;
FIG. 4 is a comparison of a locknut of an embodiment of the present invention with a conventional nut;
FIG. 5 is a schematic structural diagram of a locknut of an embodiment of the utility model during threaded connection;
fig. 6 is a schematic structural view of a lock screw according to an embodiment of the present invention.
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 or similar 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 accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
According to the anti-loose fastener of the embodiment of the first aspect of the present invention, the anti-loose fastener 10 is provided with the threaded portion 100, the threaded portion 100 may be an internal thread or an external thread, when the threaded portion 100 is an internal thread, the anti-loose fastener 10 is an anti-loose nut, when the threaded portion 100 is an external thread, the anti-loose fastener 10 is an anti-loose screw, an anti-loose bolt or an anti-loose stud, and the structure of the anti-loose fastener 10 is described in detail in this embodiment by taking the anti-loose nut as an example.
As shown in fig. 2, the thread portion 100 is provided with two thread segments 110, the two thread segments 110 are spaced front and back, the thread portion 100 is provided with a relief groove 120 between two adjacent thread segments 110, the relief groove 120 is preferably long or short for thread processing, both thread segments 110 have the same geometric parameters, such as thread pitch, thread form, pitch diameter and rotation direction, and the distance between two adjacent root center lines 111 of any one thread segment 110 is the thread pitch.
As shown in fig. 3, since the undercut 120 is provided between two of the thread segments 110, the thread-starting points of the two thread segments 110 may be arranged in different orientations, the shortest straight line between the thread-starting point of any one thread segment 110 and the central axis of the thread segment 100 is the thread-starting line 112, and the thread-starting lines 112 of two adjacent thread segments 110 are not parallel to each other, so that the projections of the thread-starting lines 112 of two adjacent thread segments 110 on a radial plane form an included angle with an angle α.
It should be noted that the relief groove 120 may not be provided between two adjacent thread segments 110, as long as two thread segments 110 are not continuous with each other, the purpose of setting the thread start point of two thread segments 110 in different orientations can also be achieved.
As shown in fig. 4, although the geometric parameters of the two thread segments 110 are the same, the thread start points of the two thread segments are different, so that the distance between the root center line 111 of any one thread segment 110 and the root center line 111 of the adjacent thread segment 110 is equal to a non-integral multiple of thread pitch, that is, the two adjacent thread segments 110 have a position offset in the axial direction, the offset height between the two thread segments 110 is k, and the absolute value of k is positively correlated with the value of α (in the range of 0 ° to 180 °). It is understood that, in addition to adjusting the angle difference between the two floss lifting wires 112 to make the thread root central line 111 of the rear thread section 110 have a certain offset height with respect to the thread root central line 111 of the front thread section 110, the offset height between the two thread sections 110 can be made by other processing means, and is not limited to the above-mentioned embodiment.
As shown in fig. 5, when the locknut is screwed with a common screw, the upper side surface of the thread form of one of the thread sections 110 is in a contact stressed state with the thread surface of the common screw, and the lower side surface of the thread form of the thread section 110 is in a separated state with the thread surface of the common screw, at this time, the thread section 110 mainly bears the axial pre-tightening force required for fastening; with the gradual locking of the locknut, the lower side surface of the tooth shape of the other thread section 110 is in a contact stress state with the thread surface of the common screw, and the upper side surface of the tooth shape of the thread section 110 is in a separation state with the thread surface of the common screw, at this time, the thread section 110 mainly has the function of eliminating the axial clearance when the previous thread section 110 is matched with the common screw, and a certain interference is generated to prevent the locknut from loosening. It should be noted that the value of k in fig. 4 (i.e., the value of α in fig. 3) is positively correlated to the axial pre-tightening force required for locking, and according to the difference of the value of k, locknuts that fit screws with different dimensional tolerance levels can be manufactured, and if the locknut is used in complicated and alternating applications or large-scale equipment, a locknut with a larger value of k should be selected.
In some embodiments of the present invention, in order to further improve the anti-loosening performance of the anti-loosening nut, the number of the thread segments 110 may be three or more, and all the thread segments 110 are arranged in a quincuncial bamboo manner, that is, the geometric parameters and the position parameters of two thread segments 110 adjacent to any one thread segment 110 are the same.
In some embodiments of the present invention, in order to save the production time and the production cost of the locknut, the threaded portion 100 is a one-step molding member, which can be formed by one-step clamping, so as to realize mass production.
In other embodiments, as shown in fig. 6, the anti-loose fastener 10 may also be an anti-loose screw, an anti-loose bolt or an anti-loose stud, and the anti-loose screw, the anti-loose bolt or the anti-loose stud is screwed into a common nut, and since the external thread and the internal thread are matched with each other, the mechanical principles of the two are communicated, so that the anti-loose fastener 10 with the external thread is not described in detail herein.
As shown in fig. 5, the threaded fastening kit according to the second aspect of the present invention includes the anti-loose fastener 10 according to the first aspect of the present invention, and further includes a common fastener 20, if the anti-loose fastener 10 is an anti-loose nut, the common fastener 20 is a common screw, and if the anti-loose fastener 10 is an anti-loose screw, the common fastener 20 is a common nut, and the anti-loose fastener 10 can be in threaded connection with the common fastener 20 commonly used in the market, so that the use cost is effectively reduced. In addition, the whole threaded connection can be completed by screwing the threaded fastening kit once, and compared with the prior art, such as a Japanese Hard-lock locknut, the threaded fastening kit has more convenience in use; under the matching of the front and rear thread sections 110, the thread section 100 of the anti-loose fastener 10 is in a contact stress state within a range of 360 degrees along the axis, and compared with the unidirectional contact state of the common fastener 20 and the Hard-lock anti-loose nut, the stress state of the fastener in the thread connection part is improved, so that the anti-loose performance of a thread fastening kit is improved.
As shown in fig. 5, the threaded fastening assembly according to the third aspect of the present invention includes the threaded fastening kit according to the second aspect of the present invention, and further includes at least two workpieces 30, where if an internal thread or an external thread is preset on one workpiece 30, at least one workpiece 30 is provided with a mounting hole 31 for a screw to pass through, and if no internal thread or an external thread is preset on all workpieces 30, all workpieces 30 are provided with mounting holes 31 for a screw to pass through. No matter how the workpieces 30 are arranged, all the workpieces 30 are positioned between the anti-loose fastener 10 and the common fastener 20, and the threaded fastening kit has good anti-loose performance, so that the threaded fastening kit can ensure the locking connection between the workpieces 30 and the workpieces 30, and the probability of safety accidents is reduced.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. Locking fastener, it is equipped with screw thread portion, its characterized in that: the thread part is provided with at least two thread sections, all the thread sections have the same geometric parameters, the distance between two adjacent thread bottom center lines of any one thread section is a thread pitch, and the distance between the thread bottom center line of any one thread section and the thread bottom center line of the adjacent thread section is equal to a non-integral multiple of the thread pitch.
2. The loose-stop fastener according to claim 1, wherein: the thread part is provided with a tool withdrawal groove between every two adjacent thread parts.
3. A loose-proof fastener as claimed in any one of claims 1 or 2, characterized in that: the shortest straight line between the tooth starting point of any one thread section and the central axis of the thread section is a tooth starting line, and the tooth starting lines of every two adjacent thread sections are not parallel to each other.
4. The loose-stop fastener according to claim 1, wherein: the thread part is an internal thread.
5. The loose-stop fastener according to claim 1, wherein: the thread part is an external thread.
6. The loose-stop fastener according to claim 1, wherein: the thread part is a one-step forming component.
7. The loose-stop fastener according to claim 1, wherein: the number of the thread sections is two.
8. The loose-stop fastener according to claim 1, wherein: the number of the thread sections is three or more, and all the thread sections are arranged in a plum blossom bamboo form.
9. A threaded fastening kit comprising the anti-loose fastener of any one of claims 1 to 8, further comprising: and the anti-loose fastener is in threaded connection with the common fastener.
10. A threaded fastening assembly comprising the threaded fastening kit of claim 9, further comprising: at least two workpieces, at least one of the workpieces is provided with a mounting hole for a screw to pass through, and all the workpieces are located between the anti-loosening fastener and the common fastener.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122114609.XU CN216278875U (en) | 2021-09-02 | 2021-09-02 | Anti-loosening fastener, threaded fastening kit and threaded fastening assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122114609.XU CN216278875U (en) | 2021-09-02 | 2021-09-02 | Anti-loosening fastener, threaded fastening kit and threaded fastening assembly |
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| CN216278875U true CN216278875U (en) | 2022-04-12 |
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| CN202122114609.XU Active CN216278875U (en) | 2021-09-02 | 2021-09-02 | Anti-loosening fastener, threaded fastening kit and threaded fastening assembly |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113775623A (en) * | 2021-09-02 | 2021-12-10 | 佛山市定中机械有限公司 | Anti-loosening fastener, threaded fastening kit and threaded fastening assembly |
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2021
- 2021-09-02 CN CN202122114609.XU patent/CN216278875U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113775623A (en) * | 2021-09-02 | 2021-12-10 | 佛山市定中机械有限公司 | Anti-loosening fastener, threaded fastening kit and threaded fastening assembly |
| WO2023029084A1 (en) * | 2021-09-02 | 2023-03-09 | 佛山市定中机械有限公司 | Anti-loosening fastener, threaded fastening set, and threaded fastening assembly |
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