TWI703274B - Nut, nut manufacturing apparatus, and nut manufacturing method - Google Patents

Abstract

The present invention provides a nut, a nut manufacturing apparatus, and a nut manufacturing method. The nut is a nut 10 into which a bolt 20 is screwed. The nut 10 includes an inner circumferential portion 11, an outer circumferential portion 12, and an intermediate portion 13. The inner circumferential portion 11 includes a deformed portion 111 that deforms inward of the inner circumferential portion 11. The intermediate portion 13 is located between the inner circumferential portion 11 and the outer circumferential portion 12. The inner circumferential portion 11 has a first distance portion L1 and a second distance portion L2. The first distance portion L1 is a length between the inner circumferential portion 11 and the outer circumferential portion 12. The second distance portion L2 is shorter than the first distance portion L1. The deformed portion 111 is located in correspondence with the first distance portion L1.

Description

Nut, nut manufacturing device, and nut manufacturing method

The invention relates to a nut, a nut manufacturing device and a nut manufacturing method.

In the past, a nut that plastically deforms the nut to prevent the bolt from loosening has been provided. The nut system described in Patent Document 1 is swaged at the tip of the nut. With the nut described in Patent Document 1, the loosening of the screw and the nut can be suppressed.

[Prior Technical Literature] [Invention Patent Literature]

[Patent Document 1 of Invention] Japanese Patent Laid-Open No. 7-251227.

However, the nut described in Patent Document 1 plastically deforms the nut by swaging. The rigidity of the plastically deformed part is reduced. Therefore, when the force is concentrated on the part of plastic deformation It will deform. As a result, the loosening of the screw and nut lock cannot be suppressed.

In view of the above-mentioned problems, the present invention aims to provide a nut, a nut manufacturing device, and a nut manufacturing method capable of suppressing deformation at a plastic deformation site.

A nut related to one aspect of the present invention is a nut screwed on a bolt. The nut system includes an inner peripheral part, an outer peripheral part, and an intermediate part. The inner peripheral portion has a deformed portion that deforms toward the inside of the inner peripheral portion. The middle part is located between the inner peripheral part and the outer peripheral part. The intermediate portion has a first distance portion and a second distance portion. In the first distance portion, the distance between the inner peripheral portion and the outer peripheral portion is set as the first distance. The second distance portion is shorter than the first distance portion. The deformed portion is arranged at a position corresponding to the first distance portion.

The inner peripheral part has a radius of curvature greater than the radius of curvature of the bolt. The deformed portion has a radius of curvature different from the radius of curvature of the inner peripheral portion.

The two first distance portions are arranged to face each other. The deformed portion is arranged at a position corresponding to each of the first distance portions.

The inner peripheral portion further has an inner peripheral deformed portion that deforms toward the inside of the inner peripheral portion. The two second distance parts are arranged to face each other. The inner peripheral deformation portion is arranged at a position corresponding to each of the second distance portions arranged face to face.

The deformed portion is plastically deformed toward the inner side of the inner peripheral portion.

The bolt system has a head and a shaft. The deformed portion includes a first deformed portion and a second deformed portion. The distance from the first deformed portion to the second deformed portion is shorter than the diameter of the shaft portion.

A nut manufacturing device according to one aspect of the present invention includes a nut, a fixing mechanism, and a deforming portion forming mechanism. This nut system has an inner peripheral part and an outer peripheral part. The nut system includes a first distance portion and a second distance portion. In the first distance portion, the distance between the inner peripheral portion and the outer peripheral portion is set as the first distance. In the second distance portion, the distance between the inner peripheral portion and the outer peripheral portion is shorter than the first distance as the second distance portion. The fixing mechanism fixes the nut. The deformed portion forming mechanism forms a deformed portion on the inner peripheral portion of the nut fixed to the fixing mechanism. The deformed portion is deformed toward the inner side of the inner peripheral portion at a position corresponding to the first distance portion of the nut.

Regarding one aspect of the present invention, the nut manufacturing method performed by the nut manufacturing device includes a fixing step and a deforming portion forming step. The nut system has an inner peripheral part and an outer peripheral part. The nut system includes a first distance portion and a second distance portion. In the first distance portion, the distance between the inner peripheral portion and the outer peripheral portion is set as the first distance. In the second distance portion, the distance between the inner peripheral portion and the outer peripheral portion is shorter than the first distance as the second distance portion. The fixing step is to fix the nut by the fixing mechanism. In the step of forming a deformed portion, the deformed portion forming mechanism forms a deformed portion on the inner peripheral portion of the nut fixed to the fixing mechanism. The deformed portion is deformed toward the inner side of the inner peripheral portion at a position corresponding to the first distance portion of the nut.

According to the present invention, it is possible to provide a nut, a nut manufacturing device, and a nut manufacturing method capable of suppressing deformation of a plastically deformed place.

10‧‧‧Nut

11‧‧‧Inner periphery

12‧‧‧peripheral

13‧‧‧Middle part

14‧‧‧Hole

15‧‧‧Flange

16‧‧‧Tool joint

20‧‧‧Bolt

21‧‧‧Head

22‧‧‧Shaft

100‧‧‧fastening element

111‧‧‧Deformation Department

111a‧‧‧First Deformation

111b‧‧‧Second Deformation

111c‧‧‧3rd Deformation

111d‧‧‧The 4th Deformation

131‧‧‧Concave

L1‧‧‧The first distance part

L2‧‧‧The second distance part

L3‧‧‧diameter

L4‧‧‧diameter

L5‧‧‧diameter

r1, r2, r3‧‧‧ radius of curvature

Fig. 1 is a schematic diagram of a nut related to an embodiment of the present invention.

Figure 2 is a schematic diagram of a bolt.

Fig. 3 is a schematic cross-sectional view of the nut of the embodiment of the present invention.

Fig. 4 is a schematic cross-sectional view showing the fastening element of the embodiment of the present invention.

Fig. 5 (a) is a view seen from the concave portion side of the nut; (b) is a view seen from the flange portion side of the nut.

The following will describe the implementation aspects of the present invention with reference to the drawings. Incidentally, in the figure, the same or equivalent parts are marked with the same reference symbols, and the description is not repeated.

1 and 2, and the fastening element 100 will be described. The fastening element 100 includes a nut 10 and a bolt 20. Fig. 1 shows a nut 10 of an embodiment of the present invention. Figure 2 shows the bolt 20. The nut 10 and the bolt 20 are paired and used to fasten the object to be fastened. The object to be fastened is an element that is screw-fastened by, for example, a nut 10 and a bolt 20. Screw fastening refers to the use of nuts 10 and bolts 20 to fasten more than two components.

The nut 10 is screwed with the bolt 20. The nut 10 is made of metal. The nut 10 includes a flange portion 15 and a tool engagement portion 16.

The flange 15 abuts against the object to be fastened. The flange portion 15 prevents the nut 10 from being buried in the object to be fastened. In addition, the flange portion 15 is integrally formed with the tool engaging portion 16.

The tool engaging portion 16 is engaged with the tool. A flange 15 is provided on one side of the tool joint 16. The other side of the tool joint 16 has a surface. In addition, the other side of the tool engaging portion 16 may have an inclination toward the edge of the flange portion 15. Furthermore, the tool joint 16 is provided with a hole 14.

The hole 14 allows the bolt 20 to pass through. The hole 14 is located in the center of the tool engaging portion 16. The hole 14 has an internal thread. The internal thread system has screw peaks and screw valleys.

Next, referring to FIG. 2, the bolt 20 will be described. The bolt 20 is screwed with the nut 10. The bolt 20 is made of metal. The bolt 20 has a head 21 and a shaft 22.

The head 21 is engaged with the tool. The head 21 has a hexagonal shape, for example. The head 21 has a pair of end faces. The shaft portion 22 is located on one end surface of the pair of end surfaces.

The shaft 22 is in contact with the internal thread. The shaft 22 is located in the center of the head 21. The shaft 22 has an external thread. The external thread system has screw peaks and screw valleys. The shaft portion 22 has a predetermined radius of curvature. The radius of curvature of the shaft 22 is the radius of curvature r3.

When the fastened object is locked through the nut 10 and the bolt 20, the fastened object is located between the nut 10 and the bolt 20. In a state where the nut 10 and the bolt 20 are in contact with the object to be fastened, any one of the nut 10 and the bolt 20 is rotated to lock the object to be fastened. Compressive force is generated on the object to be fastened by the nut 10 and the bolt 20. In addition, the internal thread of the nut 10 for locking the object to be fastened is screwed with the external thread of the bolt 20 to generate a tensile force against the compression force. With the generated compression force and tensile force, the nut 10 and the bolt 20 can be screwed to the object to be fastened.

Next, referring to FIG. 1, the nut 10 will be described in detail. The tool engaging portion 16 includes a hole portion 14, an outer peripheral portion 12 and an intermediate portion 13. The hole portion 14 includes an inner peripheral portion 11.

The inner peripheral portion 11 is in contact with the bolt 20. The inner peripheral portion 11 has a predetermined radius of curvature. Specifically, the inner peripheral portion 11 has a radius of curvature r2. The radius of curvature r2 is larger than the radius of curvature r3 of the shaft 22 shown in FIG. 2. Since the inner peripheral portion 11 has a curvature greater than that of the bolt 20, the nut 10 and the bolt 20 are screwed together. In addition, the inner peripheral portion 11 has a deformed portion 111.

The deforming portion 111 is in contact with the shaft portion 22. Since the deforming portion 111 abuts the shaft portion 22, the movement of the shaft portion 22 is suppressed. As a result, the deformed portion 111 can suppress the locking of the nut 10 and the bolt 20 from loosening.

The deformed portion 111 is a portion where a part of the inner peripheral portion 11 is deformed toward the inside of the inner peripheral portion 11. For example, the deformed portion 111 has a predetermined curvature. The deformed portion 111 has a radius of curvature r1 that is different from the radius of curvature r2 of the inner peripheral portion 11. The radius of curvature r1 is greater than the radius of curvature r2. In addition, the deformed portion 111 is a circular arc that is convex in the direction of the outer peripheral portion 12. In addition, the deformed portion 111 may be a circular arc that is convex toward the inside of the inner peripheral portion 11. Furthermore, the deformed portion 111 is not limited to have a predetermined curvature. For example, the deformed portion 111 may be rectangular.

In addition, a plurality of deformed parts 111 are provided in the inner peripheral part 11. The deformed portion 111 includes a first deformed portion 111a, a second deformed portion 111b, a third deformed portion 111c (an inner peripheral deformed portion), and a fourth deformed portion 111d (an inner peripheral deformed portion). The first deforming portion 111a and the second deforming portion 111b are arranged to face each other. The third deformed portion 111c is arranged to face the fourth deformed portion 111d.

The outer peripheral part 12 is in contact with the tool. The outer peripheral portion 12 is, for example, hexagonal. The outer peripheral portion 12 has 6 sides and 6 corners. The lengths of the 6 sides are equal.

The intermediate portion 13 is located between the inner circumferential portion 11 and the outer circumferential portion 12. The intermediate portion 13 connects the inner peripheral portion 11 to the outer peripheral portion 12. The middle part 13 is a chamfered part. The intermediate portion 13 has a predetermined thickness. Specifically, the thickness of the intermediate portion 13 corresponds to the distance from the inner peripheral portion 11 to the outer peripheral portion 12.

In addition, the intermediate portion 13 has a first distance portion L1 and a second distance portion L2. The first distance portion L1 is the distance from the inner edge of the inner peripheral portion 11 to the corner of the outer peripheral portion 12. For example, the first distance portion L1 is the distance from the edge of the first deforming portion 111a to the corner portion of the outer peripheral portion 12. In addition, at least one pair of the first distance portion L1 is arranged. Furthermore, the pair of first distance portions L1 face each other.

The second distance portion L2 is the distance from the inner edge of the inner peripheral portion 11 to the edge of the outer peripheral portion 12. For example, the second distance portion L2 is the distance from the edge of the fourth deformed portion 111d to the edge of the outer peripheral portion 12. In addition, at least one pair of the second distance portion L2 is arranged. Furthermore, the paired second distance portions L2 face each other.

The second distance portion L2 is shorter than the first distance portion L1. Therefore, the first distance portion L1 and the second distance portion L2 are different in thickness from the intermediate portion 13. Compared with the middle part 13 of the second distance part L2, the middle part 13 of the first distance part L1 is thicker.

In addition, the intermediate portion 13 is provided with a recess 131. When the recess 131 is formed in the middle part 13, the middle part 13 is plastically deformed by pressing the swage tool (Swage). As a result, a recess 131 is formed in the intermediate portion 13. In addition, the swaging tool may be, for example, a swage pliers included in a nut forming device. Furthermore, the concave portion 131 is applied with force toward the inner side of the inner peripheral portion 11 to plastically deform the intermediate portion 13. Therefore, a part of the inner peripheral portion 11 is deformed toward the inside of the inner peripheral portion 11. That is, at the same time as the recessed portion 131 is formed, the deformed portion 111 is also formed.

Moreover, the recessed part 131 is formed in the 1st distance part L1. Due to the formation of the recessed portion 131, a deformed portion 111 is formed at a position corresponding to the first distance portion L1. Compared with the second distance portion L2, the first distance portion L1 is thicker. That is, the rigidity of the first distance portion L1 is higher than that of the second distance portion L2. Thereby, the change of the shape of the deformed portion 111 can be suppressed. This result can control the loosening of the locking of the nut 10 and the bolt 20.

Moreover, the recessed part 131 may be formed in the 2nd distance part L2. Due to the formation of the concave portion 131, a deformed portion 111 is formed at a position corresponding to the second distance portion L2. Therefore, by forming the deforming portion 111 at the position corresponding to the second distance portion L2, the looseness of the locking of the nut 10 and the bolt 20 can be controlled.

In addition, the loosening of the locking of the nut 10 and the bolt 20 may be controlled through the first deforming portion 111a, the second deforming portion 111b, the third deforming portion 111c, and the fourth deforming portion 111d. The pressure applied from the bolt 20 is distributed to the four deformed parts 111. Thereby, the change of the shape of the deformed portion 111 can be suppressed. This result can more effectively control the loosening of the locking of the nut 10 and the bolt 20.

Next, referring to FIGS. 3 and 4, the inner peripheral portion 11 will be described in detail. FIG. 3 is a schematic cross-sectional view of the nut 10. FIG. 4 is a schematic cross-sectional view of the fastening element 100. The diameter of the inner peripheral portion 11 of the hole 14 shown in FIG. 3 is different between the inner peripheral portion on the side of the recess 131 and the inner peripheral portion 11 on the side of the flange portion 15. The diameter of the inner peripheral portion 11 on the side of the recess 131 is the diameter L3. The diameter L3 is the length from the vertex of the spiral valley corresponding to the first deforming portion 111a to the vertex of the spiral valley corresponding to the second deforming portion 111b. In addition, the diameter of the inner peripheral portion 11 on the side of the flange portion 15 is the diameter L4. The diameter L4 is the length from the vertex of the spiral valley corresponding to one inner peripheral portion 11 to the vertex of the spiral valley corresponding to the other inner peripheral portion 11. The diameter L3 is shorter than the diameter L4. Since the first deformed portion 111a and the second deformed portion 111b are deformed toward the inner side of the inner peripheral portion 11, the diameter L3 is shorter than the diameter L4.

The diameter of the external thread of the shaft portion 22 shown in FIG. 4 is the diameter L5. The diameter L5 is the length from the apex of one of the screw crests of the external thread to the apex of the other screw crest. Compared with the diameter L4 shown in Fig. 3, the diameter L5 is shorter. Therefore, the shaft portion 22 can be inserted into the hole portion 14 from the flange portion 15 side. Moreover, the diameter L5 is longer than the diameter L3 shown in FIG. 3. Therefore, when the shaft portion 22 is located at the position of the diameter L3 of the hole portion 14, the rotation of the shaft portion 22 can be suppressed.

Next, referring to FIG. 5, the shape of the inner edge of the inner peripheral portion 11 of the nut 10 will be described in detail. Fig. 5(a) is a view of the nut 10 viewed from the side of the recess 131. Fig. 5(b) is a view of the nut 10 viewed from the flange 15 side. The shape of the inner edge of the inner peripheral portion 11 of the nut 10 is different on the deformed portion 111 side and the flange portion 15 side.

As shown in FIG. 5a, the shape of the inner edge on the side of the recess 131 is approximately octagonal. The side of the recess 131 corresponds to an example of the “one end portion” of the nut 10. The inner edge on the side of the recess 131 corresponds to an example of the "first inner edge". The inner edge on the side of the concave portion 131 includes four arcs of curvature r1 and four arcs of curvature r2. The inner edge on the side of the concave portion 131 is alternately connected by an arc of curvature r1 and an arc of curvature r2. As shown in Fig. 5b, the inner edge on the side of the flange 15 is a circle. The side of the flange 15 corresponds to an example of the “other end” of the nut 10. The shape of the inner edge on the side of the flange 15 corresponds to an example of the "second inner edge". Since the first inner edge is approximately octagonal, and different from the shape of the shaft 22 of the bolt 20, it can be seen that it is not the insertion portion of the shaft 22. Since the shapes of the first inner edge portion and the second inner edge portion are different, the insertion portion of the shaft portion 22 of the bolt 20 can be easily understood.

Moreover, the deformed portion 111 of the nut 10 shown in FIGS. 1, 3, and 4 is formed by a nut manufacturing apparatus. The nut manufacturing device is provided with a fixing mechanism and a deforming portion forming mechanism. The fixing mechanism fixes the nut 10 to the fixing mechanism so that the nut 10 does not move. The motion of the fixing mechanism fixing nut 10 corresponds to an example of the "fixing step". The deformed portion forming mechanism forms a deformed portion 111 on the inner peripheral portion 11 of the nut 10 to be fixed. The operation of the deformed portion forming mechanism to form the deformed portion 111 on the nut 10 corresponds to the example of the "deformed portion forming step". The deforming portion forming mechanism forms the deforming portion 111 at a position corresponding to the first distance portion L1 of the nut 10. In addition, the deformed portion forming mechanism forms the deformed portion 111 so as to deform the deformed portion 111 toward the inner side of the inner peripheral portion 11.

The embodiments of the present invention have been described above while referring to the drawings (FIG. 1 to FIG. 5). However, the present invention is not limited to the above-mentioned implementation aspects, and various aspects can be implemented as long as it does not deviate from the gist of the invention. In addition, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, several constituent elements may be deleted from all the constituent elements disclosed in the implementation mode. Furthermore, the constituent elements of different implementations can also be combined interactively as appropriate. The drawings are schematically shown with the respective constituent elements as the main body for easier understanding, and the thickness, length, number, and interval of the constituent elements shown in the drawings will vary with the suitability of the drawing. The actual situation is different. Furthermore, the speed, material, shape, size, etc. shown in the above embodiments are only an example, and are not intended to be particularly limited, and various changes can be made without materially departing from the scope of the composition of the present invention.

[Industrial availability]

The present invention can be used in the fields of nut, nut manufacturing device and nut manufacturing method.

10‧‧‧Nut

11‧‧‧Inner periphery

12‧‧‧peripheral

13‧‧‧Middle part

14‧‧‧Hole

15‧‧‧Flange

16‧‧‧Tool joint

100‧‧‧fastening element

111‧‧‧Deformation Department

111a‧‧‧First Deformation

111b‧‧‧Second Deformation

111c‧‧‧3rd Deformation

111d‧‧‧The 4th Deformation

131‧‧‧Concave

L1‧‧‧The first distance part

L2‧‧‧The second distance part

r1, r2‧‧‧ radius of curvature

Claims (11)

A nut is a nut screwed on a bolt and is provided with: an inner peripheral part; an outer peripheral part; and an intermediate part located between the inner peripheral part and the outer peripheral part; the inner peripheral part has a direction toward the inner peripheral A deformed portion deformed inside the portion; the intermediate portion has a first distance portion whose first distance is the distance between the inner peripheral portion and the outer peripheral portion, and a second distance portion shorter than the first distance portion The deformed portion is arranged at a position corresponding to the first distance portion; the inner peripheral portion has a radius of curvature greater than the radius of curvature of the bolt; the deformed portion has a curvature different from that of the inner peripheral portion The radius of curvature of the radius. The nut described in claim 1, wherein: the two first distance parts are arranged facing each other; the deformed part is arranged at a position corresponding to each of the first distance parts. The nut according to claim 1 or 2, wherein: the inner peripheral part further has an inner peripheral deformed part deformed toward the inside of the inner peripheral part; the two second distance parts are arranged face to face with each other; the inner peripheral part The deforming part is arranged at a position corresponding to each of the second distance parts arranged face to face. The nut according to claim 1 or 2, wherein: the middle part is a chamfered part with a first recess and a second recess; The first recess is located at the first distance portion; the second recess is located at the second distance portion. The nut according to claim 1 or 2, wherein: the deformed portion is plastically deformed toward the inner side of the inner peripheral portion. The nut according to claim 1 or 2, wherein: the bolt has a head and a shaft; the deformed part includes a first deformed part and a second deformed part; from the first deformed part to the second deformed part The distance of the part is shorter than the diameter of the shaft part. The nut according to claim 1 or 2, wherein: the first inner edge of the inner peripheral portion is located at one end of the nut; the second inner edge of the inner peripheral portion is located on the other end of the nut One end; the shape of the first inner edge is different from the shape of the second inner edge; the shape of the first inner edge is approximately octagonal. A nut is a nut screwed on a bolt and is provided with: an inner peripheral part; an outer peripheral part; and an intermediate part located between the inner peripheral part and the outer peripheral part; the inner peripheral part has a direction toward the inner peripheral A deformed portion deformed inside the portion; the intermediate portion has a first distance portion whose first distance is the distance between the inner peripheral portion and the outer peripheral portion, and a second distance portion shorter than the first distance portion ; The deformed portion is arranged at a position corresponding to the first distance portion; the intermediate portion is a chamfered portion with a first concave portion and a second concave portion; The first recess is located at the first distance portion; the second recess is located at the second distance portion. A nut is a nut screwed on a bolt and is provided with: an inner peripheral part; an outer peripheral part; and an intermediate part located between the inner peripheral part and the outer peripheral part; the inner peripheral part has a direction toward the inner peripheral A deformed portion deformed inside the portion; the intermediate portion has a first distance portion whose first distance is the distance between the inner peripheral portion and the outer peripheral portion, and a second distance portion shorter than the first distance portion ; The deformed portion is arranged at a position corresponding to the first distance portion; the first inner edge of the inner peripheral portion is located at an end of the nut; the second inner edge of the inner peripheral portion is tied to the screw The other end of the cap; the shape of the first inner edge is different from the shape of the second inner edge; the shape of the first inner edge is approximately octagonal. A nut manufacturing device is provided with a fixing mechanism for fixing a nut having an inner peripheral portion and an outer peripheral portion, and the nut is provided with a first distance whose distance between the inner peripheral portion and the outer peripheral portion is set as the first distance 1 distance portion, and a second distance portion where the distance between the inner peripheral portion and the outer peripheral portion is shorter than the first distance; and a deformation portion forming mechanism attached to the inner periphery of the nut fixed to the fixing mechanism The portion forms a deformed portion; the deformed portion is deformed toward the inner side of the inner peripheral portion at a position corresponding to the first distance portion of the nut; The inner peripheral portion has a radius of curvature greater than the radius of curvature of the bolt; the deformed portion has a radius of curvature different from the radius of curvature of the inner peripheral portion. A method of manufacturing a nut is a method of manufacturing a nut performed by a nut manufacturing device. The method of manufacturing a nut includes a step of fixing a nut having an inner peripheral portion and an outer peripheral portion by a fixing mechanism, and the nut is provided with The distance between the inner peripheral portion and the outer peripheral portion is a first distance portion where the first distance is set, and a second distance portion where the distance between the inner peripheral portion and the outer peripheral portion is shorter than the first distance; and a deformed portion The forming mechanism forms a deformed portion forming step of forming a deformed portion on the inner peripheral portion of the nut fixed to the fixing mechanism; the deformed portion is at a position corresponding to the first distance portion of the nut and faces the inner peripheral portion The inner periphery is deformed; the inner periphery has a radius of curvature greater than the radius of curvature of the bolt; the deformed portion has a radius of curvature that is different from the radius of curvature of the inner periphery.

Images