JP2017101804A - Fastener - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fastener which can improve fastening rigidity between components.SOLUTION: A rivet 10 as a fastener comprises a pressure receiving part 12, an insertion part 14 and caulking parts 16. A surface 12A of the pressure receiving part 12 receives fastening pressure from the outside. One end 14A of the insertion part 14 in an axial direction is connected to a rear surface 12B of the pressure receiving part 12. The other end 14B of the insertion part 14 in the axial direction is formed into a cylindrical shape, and inserted into a resin plate 22 as a first component, and a metal plate 20 as a second component which is superimposed on the resin plate 22. The caulking parts 16 are arranged along a peripheral edge of the other end 14B of the insertion part 14 in a plurality of pieces, and have blade regions 16A to 16D which protrude to an insertion direction of the insertion part 14 from the other end 14B. The blade regions 16A to 16D are deformed to the outside of a radial direction of the insertion part 14 in the resin plate 22 and the metal plate 20, and caulk the resin plate 22 and the metal plate 20 to each other.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a fastener.

  Patent Document 1 discloses a self-piercing rivet (SPR). This rivet is driven into a plurality of overlapped members using a punch. The cylindrical tip portion of the rivet that has been driven in is deformed and crimped, and the overlapped members are fastened together by the rivet.

JP 2007-2222885 A

  By the way, since the tip portion of the rivet is on the same cylindrical circumference, the amount of diameter expansion deformation of the tip portion is small and the caulking width is small. For this reason, the fastening strength between parts by rivets is small, and there is room for improvement.

  In view of the above fact, an object of the present invention is to obtain a fastener capable of improving the fastening strength between parts.

  The fastener according to the first aspect of the present invention has a pressure receiving portion that receives an external fastening pressure on the front surface, one end in the axial direction connected to the back surface of the pressure receiving portion, and the other end in the axial direction caused by the fastening pressure. A cylindrical insertion portion inserted into the first member and the second member overlapped with the first member, and a plurality of insertion portions provided along the periphery of the other end of the insertion portion, projecting from the other end in the insertion direction of the insertion portion, A caulking portion having a blade portion that caulks the first member and the second member by deforming radially outward of the insertion portion inside the first member and the second member is provided.

  The fastener according to claim 1 includes a pressure receiving portion, an insertion portion, and a caulking portion. A pressure receiving part receives the fastening pressure from the outside on the surface. The insertion portion is cylindrical. One end of the insertion portion in the axial direction is connected to the back surface of the pressure receiving portion. The other end in the axial direction of the insertion portion is inserted into the first member and the second member superimposed on the first member by the fastening pressure.

  Here, the caulking portion has a plurality of blade portions provided along the periphery of the other end of the insertion portion. The blade portion protrudes from the other end of the insertion portion in the insertion direction of the insertion portion. For this reason, since the total outline length of a plurality of blade parts becomes long, the blade parts are easily deformed radially outward of the insertion portion inside the first member and the second member, and the first member and the second member It is possible to increase the caulking width of the caulking portion to the outer side in the radial direction.

  The fastener according to the invention described in claim 1 has an excellent effect that the fastening strength between components can be improved.

It is a perspective view of the fastener concerning one embodiment. (A) is a side view of the fastener shown in FIG. 1, and (B) is a sectional view of the fastener shown in (A) (a sectional view taken along line AA in (A)). (A)-(D) is process sectional drawing explaining the fastening method of the fastener shown by FIG.1 and FIG.2 sequentially. It is a top view which shows the deformation | transformation state of the fastener after the fastening shown by FIG. 3 (D).

  Hereinafter, the fastener which concerns on embodiment of this invention is demonstrated using FIGS. 1-4. In the figure, the arrow U indicates the upward direction, and the arrow D indicates the downward direction. In addition, the application direction of the fastener which concerns on this Embodiment is not limited.

(Configuration of fasteners)
As shown in FIGS. 1, 2 (A) and 2 (B), a self-piercing rivet (hereinafter simply referred to as “rivet”) 10 as a fastener according to the present embodiment includes a pressure receiving portion 12 and The insertion portion 14 and the caulking portion 16 are provided.

  The pressure receiving part 12 is formed in a disc shape whose vertical direction is the plate thickness direction. The upper surface 12A of the pressure receiving portion 12 is a portion that receives a fastening pressure (fastening load) from the outside. Although the pressure receiving part 12 is not limited by the member to fasten, for example, it is formed with metal materials, such as iron, light metal materials, such as an aluminum alloy, or resin materials, such as carbon fiber reinforced resin and glass fiber reinforced resin. Yes.

  The insertion portion 14 is formed in a cylindrical shape whose axial direction is the vertical direction, in this embodiment, a cylindrical shape, and is set to have a constant inner diameter, a constant outer diameter, and a constant thickness in the axial direction. One axial end 14 </ b> A on the upper side of the insertion portion 14 is connected to a back surface 12 </ b> B facing the front surface 12 </ b> A of the pressure receiving portion 12, and is formed integrally with the pressure receiving portion 12 here. The other axial end 14B on the lower side of the insertion portion 14 is a portion that is inserted (embedded) into a plurality of members that are overlapped in the vertical direction. The inside 14C of the insertion portion 14 is a cavity whose upper side is closed by the pressure receiving portion 12 and whose lower side is open.

  The caulking portion 16 is configured to include a plurality of four blade portions 16A to 16D in the present embodiment. The plurality of blade portions 16A to 16D are provided along the peripheral edge of the other end 14B of the insertion portion 14 with a constant interval counterclockwise in plan view (here, every 90 degrees). The blade parts 16A to 16D are formed in an isosceles triangle shape in which the width dimension W of the root 16U decreases in the downward direction as the insertion direction of the insertion portion 14 in a side view, and the cutting edge 16T at the tip in the downward direction is sharp. Yes. The root 16U of the blade part 16A is connected to the root 16U of another adjacent blade part 16B via a connecting portion 16J. Similarly, the roots 16U of the blade part 16B and the blade part 16C, the roots 16U of the blade part 16C and the blade part 16D, and the roots 16U of the blade part 16D and the blade part 16A are all connected to the connecting portion 16J. Are connected through. Here, the vertical dimension L1 of the connecting portion 16J is equal to or larger than the dimension L2 that is a half of the difference between the outer diameter of the pressure receiving portion 12 and the outer diameter of the insertion portion 14. ing.

  Moreover, as shown in FIG. 2B, the cross-sectional shape in the thickness direction of the blade portions 16A to 16D is a shape in which the thickness decreases toward the insertion direction. More specifically, the blade portions 16A to 16D have a straight shape in which the outer wall 16O side coincides with the vertical direction from the other end 14B of the insertion portion 14 toward the blade edge 16T, and the inner wall 16I side is the central axis side of the insertion portion 14. It is formed in the cross-sectional shape used as the circular arc shape which protrudes in this. Thereby, blade part 16A-16D is set as the structure which reduces thickness gradually from the thickness t of the insertion part 14. FIG. By providing such a cross-sectional shape, each of the blade portions 16 </ b> A to 16 </ b> D is configured to be deformed outward in the radial direction of the insertion portion 14 during fastening by caulking.

  The boundary between the other end 14B of the insertion portion 14 and the connecting portion 16J is started by deformation by caulking formed in a link shape along the circumference of the insertion portion 14 as indicated by a broken line for convenience. This is the starting point BL.

(Fastening method for fasteners)
The fastening method (caulking method) of a plurality of members using the rivet 10 is as follows. First, as shown in FIG. 3A, a plate-like resin plate 22 as a first member is superposed on a plate-like metal plate 20 as a second member, and this embodiment is formed on the surface of the resin plate 22. The rivet 10 according to the form is set. The metal plate 20 is superposed on the back surface of the resin plate 22 opposite to the side on which the rivet 10 is set, with the surface of the metal plate 20 facing. As the metal plate 20, for example, an iron plate, an aluminum alloy plate, or the like is used. Moreover, although the metal plate 20 is plate-shaped, the first member may be a block-shaped member. For the resin plate 22, for example, a carbon fiber reinforced resin plate, a glass fiber reinforced resin plate, or the like is used. The thickness of the resin plate 22 is set to be thicker than the axial length of the insertion portion 14 of the rivet 10 and thinner than the axial length of the insertion portion 14 plus the length of the caulking portion 16 in the same direction. It is said that. The rivet 10 is set with the cutting edge 16T of the caulking portion 16 facing downward and the surface 12A of the pressure receiving portion 12 facing upward.

  As shown in FIG. 3B, a fastening pressure (fastening load) F acting downward from the outside is applied to the surface 12A of the pressure receiving portion 12 of the rivet 10. The fastening pressure F is given by a punch (not shown). When receiving the fastening pressure F, the insertion of the blade edges 16T of the blade portions 16A to 16D of the caulking portion 16 starts from the surface of the resin plate 22 in the thickness direction.

  When the fastening pressure F is subsequently received, the insertion portion 14 of the rivet 10 is inserted into the resin plate 22 and the caulking portion 16 is inserted to the back side of the resin plate 22 as shown in FIG. Is done. At this time, due to the insertion of the rivet 10, the back surface of the resin plate 22 slightly protrudes (swells), and the surface of the metal plate 20 is recessed downward. As described above, the blade portions 16A to 16D of the caulking portion 16 are all deformed while being spread outward in the radial direction of the insertion portion 14 when inserted into the resin plate 22 because the inner wall 16I has an arc shape. Start. This deformation occurs around the starting point BL that becomes the boundary between the insertion portion 14 and the caulking portion 16. As the rivet 10 is inserted, the rear surface of the metal plate 20 protrudes downward, like the rear surface of the resin plate 22.

  Further, when the fastening pressure F is received, the insertion portion 14 and the caulking portion 16 of the rivet 10 are placed on the resin plate until the back surface 12B of the pressure receiving portion 12 contacts the surface of the resin plate 22 as shown in FIG. 22 and the metal plate 20. At this time, the blade portions 16A to 16D of the caulking portion 16 all bite into the surface portion of the metal plate 20 through the protruding portion of the resin plate 22, and as shown in FIG. It is deformed and caulked with a spread in all directions radially outward. Note that all of the blade portions 16A to 16D may penetrate the resin plate 22 and bite into the metal plate 20 directly. When the caulking is completed, the resin plate 22 is fastened to the metal plate 20 using the rivet 10, and the fastening structure in which the resin plate 22 is fastened to the metal plate 20 using the rivet 10 is completed.

(Operation and effect of the present embodiment)
As described above, the rivet 10 according to the present embodiment includes the pressure receiving portion 12, the insertion portion 14, and the caulking portion 16 as shown in FIGS. 1, 2A, and 2B. The pressure receiving portion 12 receives an external fastening pressure F on the surface 12A. The insertion portion 14 is cylindrical. One end 14 </ b> A in the axial direction of the insertion portion 14 is connected to the back surface 12 </ b> B of the pressure receiving portion 12. As shown in FIGS. 3B and 3C, the other end 14B in the axial direction of the insertion portion 14 is inserted into the resin plate 22 and the metal plate 20 superposed on the resin plate 22 by the fastening pressure F. Is done.

  Here, the caulking portion 16 includes a plurality of blade portions 16 </ b> A to 16 </ b> D provided along the periphery of the other end 14 </ b> B of the insertion portion 14. Blade part 16A-16D protrudes in the insertion direction (downward direction) of the insertion part 14 from the other end 14B. For this reason, since the total outline length 16L of the plurality of blade portions 16A to 16D of the caulking portion 16 can be earned in the insertion direction, for example, it becomes longer than the case where the blade portions 16A to 16D are not provided.

  As shown in FIG. 3D and FIG. 4, when the contour length 16L is increased, the blade portions 16A to 16D are easily deformed radially outward in the resin plate 22 and the metal plate 20. As a result, the caulking width Wc of the caulking portion 16 that caulks the resin plate 22 and the metal plate 20 outward in the radial direction can be increased. More specifically, the caulking width Wc is the total dimension of the basic caulking width W1 and the increased caulking width W2. The basic caulking width W1 is a dimension that is expanded and deformed from the outer wall of the insertion portion 14 to the radially outer side of the insertion portion 14 in a portion from the starting point BL to the root 16U of the blade portions 16A to 16D. This basic caulking width W1 is substantially equal to the dimension L2 that is a half of the difference between the outer diameter of the pressure receiving portion 12 and the outer diameter of the insertion portion 14, and matches the caulking width of the conventional self-piercing rivet. On the other hand, the increased caulking width W2 is a dimension that is increased by the diameter expansion deformation of the blade portions 16A to 16D in addition to the basic caulking width W1.

  Therefore, in the rivet 10 according to the present embodiment, the caulking width Wc is increased to increase the caulking area (the bite area shown by hatching in FIG. 4). The fastening strength of can be improved.

  In addition, the rivet 10 according to the present embodiment is easy to insert into the resin plate 22 and the metal plate 20 because the cutting edges 16T of the blade portions 16A to 16D of the caulking portion 16 have a sharp shape. For this reason, a fastening operation can be performed stably.

[Supplementary explanation of the above embodiment]
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the present invention, the rivet caulking portion may be constituted by two, three, or five or more blade portions. In the present invention, the rivet insertion portion may be formed in a cylindrical shape such as an elliptical cylindrical shape, a semi-cylindrical shape, or a polygonal cylindrical shape with more than a triangle other than the cylindrical shape. Furthermore, in the present invention, the shape of the blade portion of the rivet caulking portion may be a semicircular shape other than a triangle, a trapezoidal shape, a rectangular shape, or the like.

10 Rivet (fastener)
12 pressure receiving part 14 insertion part 16 caulking part 16A-16D blade part 20 metal plate (second member)
22 Resin plate (first member)

Claims (1)

A pressure receiving portion that receives external fastening pressure on the surface;
One end in the axial direction is connected to the back surface of the pressure receiving portion, and the other end in the axial direction is inserted into the first member and the second member superimposed on the first member by the fastening pressure, and a cylindrical insertion portion,
A plurality are provided along the periphery of the other end of the insertion portion, project from the other end in the insertion direction of the insertion portion, and deformed radially outward of the insertion portion inside the first member and the second member. And a caulking portion having a blade portion for caulking the first member and the second member;
Fastener with.

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