JP2016090016A - Nut fastener - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nut fastener that can be easily fixed to an open hole formed at a base material.SOLUTION: A nut fastener 1 is constituted by a nut part 4 arranged at one side of an installing open hole 3 opened at a prescribed position of a plate-like base material 2 and a nut fixing part 5 arranged at the other side of the installing open hole 3, and it is installed and fixed to the installing open hole 3 by a caulking device. In the nut fastener, a female thread part 42 extending from one end part 41 of the nut part 4 within a prescribed range inside of it and a guide hole 44 extending from the other end within a prescribed range inside of it are formed. The nut fixing part 5 has at least a guide part 51 having a substantial equal outer diameter to an inner diameter of the guide hole 44, a first engaging part 53 arranged at a base part of the guide part 51 and engaged with a peripheral edge of the guide hole 44, and a second engaging part 55 arranged at a base part of the first engaging part 53 and engaged with a peripheral edge of the installing open hole 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a nut fastener for fixing a nut for a screw bolt to a base material made of a resin or a carbon fiber reinforced plastic (CFRP) material used in electric vehicle-related and communication equipment industries.

  Patent document 1 (Unexamined-Japanese-Patent No. 2009-79666) discloses the insert nut of the form which comprises a metal inner cylinder in the resin outer cylinder, and comprises a two-layer structure. In this insert nut, the inner cylinder is reduced in diameter on the way from one end to the other end in the axial direction to form a stepped portion, and a predetermined range on the end side of the reduced diameter range is used as a caulking portion. Yes. The outer cylinder corresponds to the outer shape of the inner cylinder so that the inner shape thereof forms a stepped cylinder having a stepped portion corresponding to the stepped portion of the inner cylinder, and the inner cylinder is the final inserted into the outer cylinder. When the position is reached, the stepped portions prevent the inner cylinder from moving in the insertion direction to the outer cylinder, and the caulked portion of the inner cylinder is caulked outward in the radial direction so that the direction opposite to the insertion direction is The movement is prevented, thereby preventing the relative movement of the inner cylinder and the outer cylinder in the axial direction.

  Patent Document 2 (Japanese Unexamined Patent Application Publication No. 2010-48308) relates to an insert nut that is press-fitted while applying heat to a base material made of resin. The insert nut includes a press-fitting portion that is press-fitted into the base material, and a press-fitting A concave-convex shape portion having a plurality of peaks and troughs provided on the side surface of the portion, the concave-convex shape portion is configured such that the valley portion has a curvature shape, and the trough portion in the first region in the concave-convex shape portion The value of the curvature reflection is not less than the value of the curvature radius of the valley in the second region downstream of the first region in the insert nut press-fitting direction.

  Patent Document 3 (Japanese Patent Application Laid-Open No. 2014-122604) provides a nut structure that can reduce processing costs and component costs and can easily provide a female thread in a hollow shape member. The nut structure includes a hollow member having an attachment hole penetrating the plate-like portion in the thickness direction, a shaft-like portion inserted into the attachment hole and projecting outward from the hollow shape member, and the shaft-like portion. A nut having a flange portion larger in diameter than the mounting hole provided at one end and abutting the inner surface of the hollow shape member, and an outer peripheral surface of the shaft-like portion of the nut protruding outward from the hollow shape member A hollow cylindrical collar press-fitted into the hollow plate, and the nut is fixed to the hollow shape member by sandwiching the plate-like portion of the hollow shape member by the flange portion and the collar of the nut. Is.

  Patent document 4 (Unexamined-Japanese-Patent No. 2014-163450) discloses the insert nut which can prevent rotation and extraction | extraction with a simple structure reliably. In addition, it is disclosed that one or more bottomed recesses are formed on the outer peripheral surface of the insert nut body. In particular, a plurality of bottomed recesses are formed around the axis of the insert nut body, each bottomed recess is discontinuously arranged, and the insert nut body is embedded in a resin molded product. It is disclosed that resin is inserted into the bottomed recess, and that the surface shape of the bottomed recess is square.

JP 2009-79666 A JP 2010-48308 A JP 2014-126054 A JP 2014-163450 A

  Patent Document 1 discloses a double structure insert nut comprising a resin outer cylinder and a metal inner cylinder. This structure of the insert nut causes a problem in the strength between the resin outer cylinder and the metal inner cylinder, and is not suitable for application to a base material made of resin, metal, CFRP, or the like.

  Patent Document 2 discloses an insert nut that is press-fitted while applying heat to a base material made of resin. In the welding process by heat of the insert nut, there is a problem that it takes time, and there is also a problem that it is necessary to prevent the thermal influence on the base material.

  In Patent Document 3, an iron nut is press-fitted into an aluminum collar and the nut is fixed to a hollow shape member. However, when the nut is provided on a flat base material, the collar portion protrudes. There is a point.

  In Patent Document 4, since a plurality of bottomed recesses are formed around the axis of the insert nut main body, a resin enters the recess of the insert nut at the time of resin molding, and a molded product is formed with the resin inserted. Therefore, it is not suitable for retrofitting the hole formed in the base material.

  In addition, it is difficult to fasten parts for CFRP materials, etc., which are expected to increase in the future, and there is a problem that convex parts appear on the product surface due to screw tightening with blind nuts and parts assembly with bolts and nuts at present. There are also problems such as an increase in the number of assembly steps.

  Thus, since the conventional insert nut has the above-described problems, the present invention eliminates the above-described problems of the insert nut and provides a nut fastener that can be easily attached to the through hole formed in the base material. It is to provide.

  Accordingly, the present invention provides a nut portion disposed on one side of a mounting through-hole that opens at a predetermined position of a plate-like base material formed of resin, metal, or carbon fiber reinforced plastic (CFRP), and the mounting A nut fastener that is arranged on the other side of the through hole and is fixed to the mounting through hole by a caulking device, wherein the nut portion is cylindrical, and from one end to the inside Are formed with a female thread portion extending within a predetermined range and a guide hole extending within a predetermined range from the other end portion, and the other end portion is formed in the axial direction of the nut portion. An annular projecting portion that protrudes and has an outer diameter smaller than the inner diameter of the mounting through hole is formed, and the nut fixing portion includes a guide portion having an outer diameter substantially equal to the inner diameter of the guide hole, and the guide At least a first meshing portion that meshes with the periphery of the guide hole, and a second meshing portion that is provided at the base of the first meshing portion and meshes with the periphery of the mounting through-hole. It is to have.

  With the above configuration, the nut portion is disposed on one side of the mounting through-hole opened in the base material, the nut fixing portion is disposed on the other side of the mounting through-hole, and the guide portion of the nut fixing portion is disposed on the mounting through-hole. The first engagement portion is engaged with the periphery of the guide hole of the nut portion by inserting the nut fixing portion into the nut portion by a caulking device and inserting the nut fixation portion into the guide hole of the nut portion. The nut portion can be firmly fixed to the base material by the second meshing portion meshing with the peripheral edge of the mounting through hole.

  It is desirable that a recess for forming the nut portion is formed between the guide portion and the first meshing portion. As a result, the excess of the nut portion generated when the first meshing portion is inserted into the periphery of the guide hole of the nut portion can be absorbed by the concave portion, so that the adhesion between the nut portion and the nut fixing portion can be improved. It is.

  Further, it is desirable that a meat catching recess is formed between the first meshing portion and the second meshing portion. As a result, the surplus of the base material generated when the second meshing portion is difficult to insert into the base material can be absorbed by the concave portion, so that the base material can be prevented from being distorted.

  Furthermore, it is desirable that a hook portion that receives a caulking force is formed in the second meshing portion. As a result, the force of the caulking device can be reliably received and the surface of the base material can be cleaned.

  According to the present invention, the mounting through hole is formed at a desired nut mounting position of a base material made of resin, metal, or carbon fiber reinforced plastic (CFRP) material, and the nut portion is caulked and fixed by the nut fixing portion. Since it can be reliably fixed in a short time by the caulking device, the workability can be improved and the cost can be reduced. Furthermore, since the surface of the nut fixing portion does not protrude from the surface of the base material, there is an effect that the press-fitted portion becomes inconspicuous.

It is explanatory drawing of the nut fastener which concerns on this invention, (a) is explanatory drawing which showed the state which mounted | wore the mounting through-hole of the base material, and showed the state which mounted | wore with the nut fixing | fixed part in (b). It is explanatory drawing which showed the state, (c) is explanatory drawing which showed the state which fixed the nut fixing | fixed part to the nut part. It is sectional drawing of the nut part of the nut fastener which concerns on Example 1 of this invention. It is explanatory drawing of the nut fixing | fixed part which concerns on Example 1 of this invention, (a) is the front view, (b) is the side view. It is explanatory drawing of the nut fixing | fixed part which concerns on Example 2 of this invention, (a) is the front view, (b) is the side view. It is explanatory drawing of the nut fixing | fixed part which concerns on Example 3 of this invention, (a) is the front view, (b) is the side view. It is explanatory drawing of the nut fixing | fixed part which concerns on Example 4 of this invention, (a) is the front view, (b) is the side view. It is sectional drawing of the nut part of the nut fastener which concerns on Example 5 of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  As shown in FIGS. 1A, 1B, and 1C, a nut fastener 1 according to Embodiment 1 of the present invention is a plate formed of a resin, metal, or carbon fiber reinforced plastic (CFRP) material. The base material 2 is fixed at a desired location, and a mounting through hole 3 having a predetermined diameter is formed at a location where the nut fastener 1 is to be attached.

  The nut fastener 1 is attached to the nut portion 4 from one side (hereinafter referred to as the front side) of the mounting through hole 3 and from the other side (hereinafter referred to as the back side) of the mounting through hole 3. And the nut fixing portion 5 to be formed.

  As shown in FIG. 2, the nut portion 4 includes a cylindrical main body portion 40, and an internal thread portion that extends from one end portion (hereinafter referred to as a bolt mounting side end portion) 41 to the inside within a predetermined range. 42 and a guide hole 44 extending from the other end (hereinafter referred to as base material side end) 43 in a predetermined range to the inside, and the base material side end 43 includes a nut portion. An annular projecting portion 45 that protrudes in the axial direction 4 and has an outer diameter smaller than the inner diameter of the mounting through hole 3 and larger than the diameter of the guide hole 44 is formed. Further, a taper portion 46 is formed at the bolt mounting side end portion 41 of the female screw portion 42. In the first embodiment, the female screw portion 42 and the guide hole 44 are formed in communication with each other, and their diameters are substantially equal.

  As shown in FIG. 3, the nut fixing portion 5 includes a guide portion 51 having an outer diameter substantially equal to the inner diameter of the guide hole 44, and a concave portion (first shape) formed in the base portion of the guide portion 51. 1 recess) 52 is provided, and on the opposite side of the recess 52, a first engagement portion 53 for engaging with the peripheral edge of the guide hole 44 is formed. In addition, a concave portion (second concave portion) 54 formed in a concave shape is also provided at the base portion of the first meshing portion 53, and meshes with the periphery of the mounting through-hole 3 on the opposite side of the second concave portion 54. A second meshing portion 55 is provided. Further, on the opposite side of the second engagement portion 55, a flange portion 56 having an outer diameter larger than the inner diameter of the mounting through hole 3 is provided.

  The first meshing portion 53 is constituted by a crest 53a formed in a predetermined number (12 in this embodiment) in the circumferential direction, and a trough 53b positioned between the crests 53a. . Is the diameter of the circumference connecting the apexes of the crest 53a larger than the inner diameter of the guide hole 44, and is the diameter of the circumference connecting the bottom of the trough 53b substantially equal to the inner diameter of the guide hole 44? It is formed a little smaller.

  The second meshing portion 55 includes a peak portion 55a formed in a predetermined number (20 in this embodiment) in the circumferential direction, and a valley portion 55b positioned between the peak portions 55a. . The diameter of the circumference connecting the vertices of the peak portions 55a is larger than the inner diameter of the mounting through hole 3, and the diameter of the circumference connecting the bottom points of the valley portions 55b is substantially equal to the inner diameter of the mounting through hole 3. It is formed to be equal or slightly smaller.

  With the above configuration, as shown in FIG. 1 (a), the nut portion 4 is inserted into the mounting through hole 3 so that the annular protrusion 45 of the nut portion 4 is inserted into the mounting through hole 3 formed in the base material 2. 4 is fixed to the mounting through hole 3. Then, as shown in FIG. 1 (b), the guide portion 51 of the nut fixing portion 5 is inserted from the back side of the base material into the guide hole 44 of the nut portion 4 and is arranged by a caulking device (not shown). The fixing part 5 is caulked and fixed to the nut part 4. In this case, as shown in FIG. 1 (c), the peak portion 53 a of the first meshing portion 53 meshes with the periphery of the guide portion 51 of the nut portion 4, and the peak portion 55 a of the second meshing portion 55. Meshes with the periphery of the mounting through-hole 3 to firmly fix the nut portion 4 to the base material 2. Further, the flange 56 is fitted so as to firmly cover the periphery of the mounting through-hole 3.

  Furthermore, the surplus margin at the periphery of the guide hole 44 generated by the engagement of the first engagement portion 53 with the periphery of the guide hole 44 is absorbed by the first recess 52, and the second engagement portion 55 is connected to the mounting through-hole 3. The surplus of the base material 2 generated by meshing with the periphery is absorbed by the second recess 54. As a result, the adhesion between the nut portion 4 and the nut fixing portion 5 and between the nut fixing portion 5 and the base material 2 can be improved.

  As shown in FIG. 4, the nut fixing portion 5A according to the second embodiment of the present invention has substantially the same configuration as that of the first embodiment described above, but has a structure in which the second recess 54 is omitted. In this case, the second recess 54 is omitted by adopting a structure in which the surplus of the base material 2 generated by the engagement of the second engagement portion 55 can be absorbed by the valley portion 55b of the second engagement portion 55. Can be eliminated. In addition, the same code | symbol is attached | subjected to the location similar to the nut fixing | fixed part 5 which concerns on Example 1, and the location which has the same effect, and the description is abbreviate | omitted.

  As shown in FIG. 5, the nut fixing portion 5B according to the third embodiment of the present invention is characterized in that the flange portion 56 is omitted from the nut fixing portion 5A according to the second embodiment described above. In particular, when the second meshing portion 55 is large enough to receive the pressing force (caulking force) by the caulking device, the flange portion 56 may be omitted. The nut fixing portion 5A may be formed with a through hole 57 from which a bolt or the like that is screwed into the female screw portion 42A protrudes. Also in the second embodiment, the same portions as those of the nut fixing portion 5 according to the first embodiment and the portions having the same effects are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 6, the nut fixing portion 5C according to the fourth embodiment of the present invention is characterized in that the second engagement portion 55 is omitted from the configuration of the nut fixing portion 5 according to the first embodiment described above. Is. The guide portion 51 is also formed with a crest and a trough so as to correspond to the crest 53a and the trough 53b of the first meshing portion 53. For this reason, in the fourth embodiment, the nut portion 4 and the nut fixing portion 5 </ b> C become the mounting through hole 3 of the base material 2 only by fitting the first engagement portion 53 to the periphery of the guide hole 44 of the nut portion 4. It is inserted.

  As shown in FIG. 7, the nut portion 4A according to the fifth embodiment of the present invention includes a guide hole 44 through which the guide portions 51 of the nut fixing portions 5, 5A, 5B, and 5C are inserted, and further includes a female screw portion 42A. Is used when the diameter is smaller than the diameter of the guide hole 44. Thus, by changing the diameter of the female thread portion 42A of the nut portion 4A, it is possible to deal with bolts having various diameters. Also in this embodiment, the same reference numerals are assigned to the same portions as the nut portion 4 described above and the portions having the same effects, and the description thereof is omitted.

DESCRIPTION OF SYMBOLS 1 Nut fastener 2 Base material 3 Mounting through-hole 4, 4A Nut part 5, 5A, 5B, 5C Nut fixing part 40 Main body part 41 Bolt mounting side end part 42 Female thread part 43 Base material side end part 44 Guide hole 45 Annular protrusion part 46 taper part 51 guide part 52 1st recessed part 53 1st meshing part 53a peak part 53b valley part 54 2nd recessed part 55 2nd meshing part 55a peak part 55b valley part 56 collar part

Claims (4)

A nut portion disposed on one side of a mounting through hole that opens at a predetermined position of a plate-like base material formed of resin, metal, or carbon fiber reinforced plastic (CFRP); and the other side of the mounting through hole In the nut fastener that is configured to be mounted and fixed to the mounting through hole by a caulking device,
The nut portion has a cylindrical shape, and is formed with a female screw portion extending from the one end portion within a predetermined range to the inside and a guide hole extending from the other end portion to the inside within a predetermined range. In addition, the other end is formed with an annular protrusion that protrudes in the axial direction of the nut portion and has an outer diameter smaller than the inner diameter of the mounting through-hole, and
The nut fixing portion includes a guide portion having an outer diameter substantially equal to the inner diameter of the guide hole, a first engagement portion provided at a base portion of the guide portion and meshing with a peripheral edge of the guide hole, A nut fastener comprising at least a second engagement portion provided at a base portion of the engagement portion and engaged with a peripheral edge of the mounting through-hole.   The nut fastener according to claim 1, wherein a recess for forming the nut portion is formed between the guide portion and the first meshing portion.   The nut fastener according to claim 1 or 2, wherein a groove portion for gathering a base material is formed between the first engagement portion and the second engagement portion.   The nut fastener according to any one of claims 1 to 3, wherein a collar portion that receives a caulking force is formed in the second meshing portion.

Images