KR101551334B1 - Fastening bolt and nut assembly - Google Patents

Abstract

The bolt and nut assembly according to the present invention includes a fastening bolt member 10 having a pin support groove 12 in the end surface thereof, a nut member 20 having a plurality of pin holes 22, And the unlocking pin 30 is supported by the pin holding groove 12 of the bolt member and is fitted into the pin hole 22 of the nut member so as to restrain the fastening state of the bolt member and the nut member. The bolt member and the nut member of the present invention are effective for preventing the screw loosening while maintaining a strong fastening force.

Description

[0001] FASTENING BOLT AND NUT ASSEMBLY [0002]

The present invention relates to a fastening bolt and a nut assembly, and more particularly to a structure for restraining a nut fastened with a bolt with a separate pin member so as not to be loosened by vibration or the like.

Well known bolts and nuts among the mechanical elements used to tighten two or more mechanical parts are effective for large loads because they use the strong fastening force of screws. However, since bolts and nuts can not be easily retained by loosening the screw when vibration is applied, a means is needed to prevent the screw loosening. Loosening the bolts and nuts by loosening the screws can cause machine failure or noise. Especially in the case of vehicles, for example, bolts connecting the line changing parts to the railway cars and car derailing accidents caused by the loosening of the nuts There is a risk of large-scale accident, and a more reliable means of preventing screw loosening is required.

The bolt and nut are provided with a spring washer, a tongued washer, a locknut or a double nut, a fixing screw a set screw or a set bolt, and a method of fastening the screw surface with a nut fitted with a cushioning material such as plastic or rubber or a cylindrical spring. However, these methods have a problem in that the fastening force of the bolt and nut is slightly strengthened And it does not fundamentally solve the problem of screw loosening due to continuous shock or vibration.

On the other hand, in the method of inserting the split pin, since the nut is restrained not to rotate with respect to the bolt, it is possible to reliably prevent the screw from being loosened. However, in order to fit the split pin, It is necessary to use a bolt having a different hole position according to the thickness of the component, and it is necessary to improve the disadvantage that the component can not be strongly pulled and the split pin once used can not be reused.

The following Patent Documents are cited as prior art related to a pin fixing method different from the split pin method described above.

The proposal of the following Patent Document 1 (Korean Utility Model Application No. 20-1999-0040447) proposes a structure in which a trough is formed in a shaft portion of a bolt along one side surface, and a plurality of protruding keys Forming a groove, and use a separate pin for the clock. The locking pins are received in the above-mentioned troughs of the bolt to provide a resilient force, and both ends of the ring portion are of a proper radiation angle and straight. The nut is constrained by pushing the ring portion of the locking pin into the groove of the bolt projecting out of the nut in the state where the bolt and the nut are fastened, and fitting the both ends into the locking groove of the nut. According to this proposal, the nut can be tightly fastened to the locking pins, so that it can be tightly fastened. However, since both ends of the locking pin can be expanded and contracted relatively large, And it is troublesome to work.

In the proposal of the following Patent Document 2 (Korean Patent Laid-Open Publication No. 10-1999-0018771), a hole is formed in the center portion of the shaft portion of the bolt from the head portion to the vicinity of the end surface of the screw portion, and a "+" And a separate spring pin is used. The spring pin is the same as the torsional coil spring. When both ends of the spring pin are pushed into the hole of the bolt and pushing to the end, the both ends of the spring pin come out of the cutout groove, . This prevents nut loosening and does not solve the screw loosening problem because it does not lock the nut in the direction of rotation.

KR 20-1999-0040447 U (November 25, 1999) KR 10-1999-0018771 A (Mar. 15, 1999)

A fastening bolt and a nut for use in machine parts in which vibration of load continuously acts like a railway vehicle described above are required to have a strong fastening force and a structure in which a bolt and a fastened nut are firmly fixed to prevent screw loosening. However, as a general method, the fastening force is initially strengthened, and the screw loosening problem due to continuous vibration is not solved fundamentally. In the conventional techniques proposed in the above-mentioned patent documents, the nut fastened with the bolt is loosened But it can not be tightened strongly and is not suitable for large loads.

Therefore, it is an object of the present invention to provide a pin fixing structure which is different from the one proposed in the above-mentioned patent documents and can sufficiently tighten the nut and sufficiently restrain the nut so as to maintain the tightening force, And to provide a new pin fixing fastening bolt and nut assembly which can be solved.

The fastening bolt and nut assembly according to the present invention for achieving the above object comprises a fastening bolt member having a fine pin support groove crossing a center of a screw section as a male thread and a female screw for fastening with the male screw, A nut member having a plurality of pin holes paired with each other at a predetermined depth toward the center at intervals and paired with the opposite pinion, a support portion received in the pin support groove of the fastening bolt member, And a pair of hooks bent inwardly and inserted into the pin hole pairs of the nut member, respectively, and both the hooks are elastically stretchable and contractible with respect to the support portion And an engaging portion provided on the nut member so as to be concave along the outer surface of the nut member, The amount of the pin supporting portion to the hole to accommodate the tips of a plurality of guide pin groove is configured further configured for guiding in each of the its features.

The bolt member is formed in a shape having a sharp peak at the center of the bottom surface of the pin support groove of the bolt member and formed as a curved portion convexly curved upwardly so that the center portion of the support portion of the release prevention pin is balanced right and left over the peak . ≪ / RTI >

Also, as a preferred form, the pin support groove of the bolt member may have a configuration of '+' shape when viewed from the center of the shaft.

In addition, as a preferred form, the support portion of the release preventing pin may be formed as a resilient portion that is inclined upward at both ends of the center portion thereof so as to be stretchable in the pin support groove.

Further, as a preferable form, the pin holes of the nut member may be inclined upwardly, and each hook portion of the unlocking pin may have a curved configuration corresponding to the inclination of the pin hole.

In a preferred form, the plurality of pin guide grooves may be formed on opposite sides of each other, and may be arranged in pairs and curved in the same direction on a circular arc having a radius corresponding to the height of the unlocking pin.

In a preferred embodiment, the plurality of pin guide grooves are formed in the same linear direction as the screw shaft, and both arms of the release preventing pin are received after the guide grooves are guided.

According to the above-described structure of the present invention, the bolt member and the nut member are fastened to each other, and then the anti-loose pin is fitted, so that the nut member can be restrained to prevent screw loosening. In other words, the support portion of the release preventing pin is received in the pin support groove of the bolt member and its rotation is prevented, and both the hook portions of the release prevention pin are fitted into the pin hole of the nut member, The screwing of the bolt member and the nut member is prevented. Here, the nut member of the present invention is elasticity imparted to the anti-loose pin, so that the height of both hook portions can be elastically adjusted with respect to the support portion, so that the nut member can be further reduced within the range of the expansion and contraction. As described above, the present invention is effective in fixing the nut member in a sufficiently taut state, and is effective in solving the aforementioned screw loosening problem while maintaining a strong fastening force.

When the pin holding groove of the bolt member is formed as a '+' shape, the anti-loose pin can be turned 90 ° in the pin holding groove, so that the position is adjusted to 2/1 of the pin hole interval of the nut member This is possible. As a result, it is possible to design the pin hole position of the nut member with respect to both the hanging portions of the unlocking pin within the error range, and the nut member can be fixed at an arbitrary position. Therefore, stable fastening force maintenance between the bolt member and the nut member, .

The inclined bottom surface of the pin support groove of the bolt member and the shape of the support portion of the release preventing pin corresponding thereto are advantageous in imparting elasticity to the release preventing pin so that the pin can be made of a material having a higher rigidity, It is also effective in improving the fastening force between the bolt member and the nut member and preventing the screw loosening.

The inclination of the pin hole of the nut member and the shape of the hook of the loosening preventing pin corresponding thereto prevent the loosening fins from falling off easily, thereby enhancing the safety of the holding force and the screw loosening function between the bolt member and the nut member.

1 is a perspective view of a bolt and a nut assembly for fastening the invention;
2 is a sectional view of a main portion of the bolt member of the present invention.
3 is a side view of the nut member of the present invention.
Fig. 4 is a longitudinal sectional view taken on line AA shown in Fig. 3; Fig.
Fig. 5 is a cross-sectional view taken along the BB line shown in Fig. 3; Fig.
6 is a detailed view of the release preventing pin of the present invention.
FIG. 7 is a longitudinal sectional view for explaining a process of fixing the bolt member and the nut member of the present invention with the release preventing pin after the fastening. FIG.
8 is a longitudinal sectional view of a main part showing a process of adjusting a fastening distance of a nut member to the bolt member of the present invention.
9 is a perspective view showing another embodiment of the bolt member of the present invention.
10 is a longitudinal sectional view of a main part showing the fastening state of the present invention using the nut member of Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the bolt and nut assembly for fastening the invention will be described in detail with reference to the accompanying drawings. It is to be understood that the embodiments shown in the accompanying drawings are only for the understanding of the present invention, and some elements may be exaggerated or omitted, and the present invention is not limited thereto.

The preferred embodiment of the bolt and nut assembly for fastening the invention is composed of the bolt member 10, the nut member 20 and the release preventing pin 30 as shown in Fig.

The bolt member 10 has a structure in which a hexagonal head bolt known as a fastening screw is used and a pin support groove 12 is formed in the threaded end 11 of the through bolt. The pin support grooves 12 are formed in a shape of a '+' shape in which two of them intersect. However, when the male screw diameter is sufficiently large, the support grooves 12 can be formed more. Preferably, as shown in Fig. 2, the bottom surfaces 12a and 12b of the pin support groove 12 are inclined like the right and left hypotenuses of a gentle isosceles triangle, and apexes 12c such as apexes of an isosceles triangle are formed at the center thereof. . Such a configuration is suitable for accommodating the expansion and contraction of the release preventing pin 30 in a balanced manner while elastically expanding and retracting. Such a bolt member 10 may be a stud bolt or a double nut bolt which is not related to the shape of a head such as a round head or a dish head as well as a hexagon head through bolt as shown in the drawing, ) Can be applied to all types of fastening bolt elements that can be tightened by a nut.

The nut member 20 is formed of a hexagonal nut known as a female thread for fastening with a male screw and is formed on each of the faces 21 on the outer face of the hexagonal nut and has a plurality of pin holes 22, And more preferably, a plurality of pin guide grooves 23 are formed. The plurality of pin guide grooves 23 are formed in a pair-like direction concave on each surface and opposite to each other as shown in Figs. 3 and 5, and are connected to the plurality of pin holes 22, respectively. The radius of the arc, which is the locus of the plurality of pin guide grooves 23, is approximately the same as the length (height) of the release prevention pin 30 (see FIG. 7). Such a nut member 20 can be applied not only to the hexagonal nut shown in the drawing but also to a square nut or a round nut.

The unlocking pin 30 is composed of a supporting portion 31, both arm portions 32 bent in the downward direction from both ends of the supporting portion 31 and both hanging portions 33 bent inward from the ends of both arm portions 32 . The support portion 31 is accommodated in the pin support groove 12 of the bolt member 10 and both the hook portions 33 formed at the ends of the both arm portions 32 are engaged with the pin holes 21 of the nut member 20, As shown in Fig. Referring to FIG. 6 as a preferred form, the support portion 31 is formed of elastic portions 31a and 31b inclined on both right and left sides and a curved portion 31c convex upward at the center. The left and right elastic portions 31a and 31b can adjust the fastening position of the nut member 20 with respect to the bolt member 10 by using its own resilience and the hook portion 33 inserted into the pin hole 21 of the nut member 20 Quot;) < / RTI > The curved portion 31c at the center of the support portion 31 is supported by the vertex 12c of the pin support groove 12 of the bolt member 10 so that the release prevention pin 30 is biased to the left and right Center it so that it does not move to either side. The hook portion 33 fitted into the pin hole 21 of the nut member 20 is not easily detached by the inclined shape and the action of the elastic portions 31a and 31b described above and securely fixes the nut member 20 . On the other hand, the arm portions 32 bent in the downward direction in the support portion 31 connect the support portion 31 and the hook portion 33 and provide elastic force acting inward to each other, ≪ / RTI >

The assembled state of the bolt member 10, the nut member 20, and the release preventing pin 30 is shown in Fig. That is, after the bolt member 10 is inserted into the corresponding hole of the engaged member 40 and the nut member 20 is fastened, the pin support portion 31 of the release preventing pin 30 is inserted into the hole of the bolt member 10 And the two hook portions 33 are rotated in the D direction along the pin guide grooves 23 of the nut member 20 so as to be inserted into the pin holes 22). In this state, the unlocking pin 30 is held by the supporting portion 31 in the pin holding groove 12 of the bolt member 10 and is restrained in the screw rotating direction, and the nut member 20 are prevented from rotating by the two hooking portions 33 of the unlocking pin 30 so that the screwing of the bolt member 10 and the nut member 20 is prevented.

When the nut member 20 is further tightened in the state shown in Fig. 7, the elastic portions 31a, 31b of the unlocking pin 30 are moved by the distance that the nut member 20 has moved from the virtual line position to the solid line position in Fig. 31b can be elastically deformed to adjust the fastening distance of the nut member 20 so that the fastening force can be enhanced and the deformed elastic portions 31a, So that the reinforced fastening force is appropriately maintained. At this time, since the unlocking pin 30 is held by the pin support grooves 12c to be centered, the balance of the unlocking pins 30 is not balanced when the elastic portions 31a and 31b are deformed, The phenomenon of being detached from the pin hole 22 is effectively prevented.

Next, Fig. 9 shows a nut member 20 'of another embodiment. The nut member 20 'of this embodiment is the same as the above-described embodiment except that a plurality of pin guide grooves 25 for the plurality of pin holes 22 are formed in the vertical direction. 10, the both arm portions 32 of the release preventing pin 30 are resiliently opened so that the hook portions 33 at both ends thereof are engaged with the vertical pin guide grooves 25, It is possible to insert the release preventing pin 30 so as to move in the direction E along the direction Y. According to this embodiment, since the unlocking pin 30 can be easily pushed from the top to the bottom and both the arm portions 32 of the unlocking pin 30 are received in the vertical pin guide groove 25, So that the effect of preventing the screw loosening can be improved.

The pin support groove 12 formed in the threaded end surface of the bolt member 10 described above has a "+" shape and a plurality of pin holes 22 formed in the nut member 20 are formed in the shape of "6" It is possible to adjust the fastening distance of the nut member 20 in the range of the screw travel distance when the nut member 20 is rotated at intervals of 15 degrees and the position of the nut member 20 can be further changed by changing the position of the pin hole 22, So that the clamped member 40 can be clamped and fixed with a strong clamping force. It is needless to say that the adjustment distance can be further finely adjusted so that more pin support grooves 12 and a plurality of pin holes 22 can be formed.

This invention is not limited by what has been described above and illustrated in the drawings, and many modifications or variations are possible within the scope of the following claims.

The present invention relates to a bolt member and a method of manufacturing the same, and more particularly, to a bolt member having a bolt member, 31c: curved portion, 33: hook portion

Claims (7)

A male thread for fastening bolt members having fine pin support grooves across the center of the thread section and female threads for fastening with the male thread, and having a certain depth toward the center at certain intervals on the outer surface, A nut member having a plurality of pin holes, a support portion accommodated in a pin support groove of the fastening bolt member, two arm portions continuous to both ends of the support portion and curved in a straight downward direction, And an unlocking pin provided on the nut member and having a pair of hook portions which are respectively bent to be inserted into the pin hole pairs of the nut member and both of the hook portions are elastically vertically stretchable and contractible with respect to the support portion, To receive the two hook ends of the unlocking pin and to guide them to the pin hole Tightening the nuts and bolts for assembly, characterized in a structure that a plurality of further pin guide groove. [2] The bolt according to claim 1, wherein the bolt member has a vertex having a sharp peak at the center of the bottom surface of the bolt member, and a curved portion bent upward to balance the central portion of the support portion of the bolt pin Wherein the fastening bolt and nut assembly features a formed configuration. The fastening bolt and nut assembly according to claim 1 or 2, wherein the pin support groove of the bolt member is '+' shaped when seen from the center of the shaft. The fastening bolt and nut assembly according to claim 1 or 2, wherein the support portion of the release prevention pin is formed as an elastic portion whose both ends are sloped upward at a central portion thereof so as to be stretchable in the pin support groove. The fastening bolt and nut assembly according to claim 1, wherein each of the pin holes of the nut member is obliquely inclined upward, and each hook portion of the release preventing pin is bent in correspondence with the inclination of the pin hole. 2. The fastening device according to claim 1, wherein the plurality of pin guide grooves are formed on opposite sides of each other and are bent in a same direction on a circular arc of a radius parallel to the height of the unlocking pin Bolt and nut assembly. The fastening bolt and nut assembly according to claim 1, wherein the plurality of pin guide grooves are formed in the same straight line direction as the screw shaft, and then both arm portions of the release preventing pins are received after the guide grooves are guided.

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