JP5580281B2 - Nut mounting structure - Google Patents

Description

  The present invention relates to a nut mounting structure for mounting a nut divided into first and second nut halves into a nut mounting hole penetrating from a first surface to a second surface of a fiber reinforced resin member.

  A metal insert having a female thread is fixed to the wall of an automobile cabin formed of FRP, and the lower end of the metal pillar is fastened to the insert with a bolt to integrally couple the cabin and the pillar. Is known from Patent Document 1 below.

  Also, an insert having an outer peripheral wall, a rib, and a fastening portion is arranged inside a frame configured to have a closed cross section with FRP, and the fastening member is fastened to the fastening portion of the insert with a bolt so that the frame and the fastening member are integrated. What is coupled is known from US Pat.

JP 2004-34977 A JP 2009-255799 A

  By the way, what was described in the said patent document 1 is considered that the insertion body is fixed to the wall part of a cabin by adhesion | attachment, and it is difficult to manage adhesive strength so that an adhesion part may not peel off. There is.

  Further, the one described in Patent Document 2 has a problem that the manufacturing process becomes complicated because it is necessary to bond an insert to the inside in the process of forming a frame made of FRP.

  Therefore, it is conceivable to fix the nut to the fiber reinforced resin member by dividing the nut into two first and second nut halves and connecting the nut attachment holes formed in the fiber reinforced resin member so as to sandwich the nut. However, in this case, if special parts or press-fitting devices for integrally joining the first and second nut halves are required, there is a problem in terms of cost and workability.

  The present invention has been made in view of the above circumstances, and an object thereof is to easily and firmly attach a nut divided into two first and second nut halves to a fiber reinforced resin member.

  In order to achieve the above object, according to the first aspect of the present invention, the first and second nut halves are formed in the nut mounting holes penetrating from the first surface to the second surface of the fiber reinforced resin member. A nut mounting structure for mounting a divided nut, wherein the first half half body includes a first flange portion that abuts the first surface around the nut mounting hole, and the first flange portion from the first flange portion. An inner cylinder portion projecting toward the two nut halves; and a first spigot fitting portion formed between the first flange portion and the inner cylinder portion; A second flange portion that abuts on the second surface around the hole, an outer cylinder portion that protrudes from the second flange portion toward the first nut half and fits into the nut mounting hole, and the second Formed between the flange part and the outer cylinder part A second spigot fitting portion that can be fitted to the first spigot fitting portion, and on the inner peripheral surface of one of the inner cylindrical portion and the outer cylindrical portion, the other side of the inner cylindrical portion and the outer cylindrical portion. A nut mounting structure is proposed, in which a female screw into which a bolt inserted from above is screwed is formed.

  According to the invention described in claim 2, in addition to the configuration of claim 1, the outer peripheral surface of the inner cylinder part and the inner peripheral surface of the outer cylinder part are brought into contact with each other by the axial force of the bolt. A nut mounting structure characterized by providing a conical tapered surface is proposed.

  According to the invention described in claim 3, in addition to the configuration of claim 2, a nut mounting structure is proposed in which a weakened portion is provided on the outer peripheral surface of the outer tube portion.

  According to the invention described in claim 4, in addition to the structure of any one of claims 1 to 3, the fiber reinforced resin member of the first flange portion and the second flange portion is applied. A nut mounting structure is proposed in which frictional force increasing means is provided on the contacting surface.

  According to the invention described in claim 5, in addition to the structure of any one of claims 1 to 4, the fiber reinforced resin member constitutes a cabin of an automobile, and includes the bolt and the nut. A nut mounting structure is proposed in which a vehicle body part is mounted on the cabin.

  The first and second tapered surfaces 12d and 13d of the embodiment correspond to the tapered surface of the present invention, and the mounted member 15 of the embodiment corresponds to the vehicle body part of the present invention.

  According to the configuration of the first aspect, the first nut half is inserted into the nut mounting hole from the first surface side of the fiber reinforced resin member, and the second nut half is inserted into the nut mounting hole from the second surface side of the fiber reinforced resin member. When the body is inserted, the first flange portion of the first nut half and the second flange portion of the second nut half abut against the first surface and the second surface of the fiber reinforced resin member, respectively. The outer cylinder part abuts on the nut mounting hole, and the first spigot fitting part of the first nut half and the second spigot fitting part of the second nut half are fitted to each other, whereby the first nut half The body and the second nut half are integrated and fixed to the nut hole of the fiber reinforced resin member. This increases the efficiency of the bolt fastening operation by holding the nut on the fiber reinforced resin member until the bolt passing through the second nut half is screwed to the female screw of the first nut half and fastened. Can do. Since the load for fitting the first and second spigot fitting portions to each other is sufficient by human power, the work can be performed even in a narrow place where a press-fitting machine does not enter, and convenience is improved.

  According to the second aspect of the present invention, since the conical tapered surfaces that can be brought into contact with each other by the axial force of the bolt are provided on the outer peripheral surface of the inner cylindrical portion and the inner peripheral surface of the outer cylindrical portion, the axial force of the bolt Thus, the outer cylindrical portion can be deformed radially outward and pressed against the inner peripheral surface of the nut mounting hole to firmly fix the nut to the fiber reinforced resin member.

  According to the third aspect of the present invention, since the weak portion is provided on the outer peripheral surface of the outer cylindrical portion, the outer cylindrical portion receives a radially outward load from the inner cylindrical portion via the tapered surface by the axial force of the bolt. Then, the outer cylinder portion can be effectively deformed radially outward and pressed against the inner peripheral surface of the nut mounting hole.

  According to the fourth aspect of the present invention, since the friction force increasing means is provided on the surfaces of the first flange portion and the second flange portion that contact the fiber reinforced resin member, the first and second flange portions are nuts by friction force. Can be more firmly fixed to the fiber reinforced resin member.

  According to the fifth aspect of the present invention, the vehicle body part can be attached by screwing the bolt to the nut by attaching the nut to the cabin of the automobile constituted by the fiber reinforced resin member.

The partially broken perspective view of the 1st nut half. (First embodiment) The partially broken perspective view of the 2nd nut half. (First embodiment) The exploded view of a nut and a fiber reinforced resin member. (First embodiment) The figure which shows the use condition which mounted | wore the fiber reinforced resin member with the nut. (First embodiment) The figure corresponding to FIG. (Second Embodiment) The figure corresponding to FIG. (Third embodiment)

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 3, for example, a cabin including a floor panel of an automobile is integrally formed with a fiber reinforced resin member 11, and has a circular shape penetrating from the first surface 11 a to the second surface 11 b of the fiber reinforced resin member 11. A metal nut 14 (see FIG. 4) divided into a first nut half 12 and a second nut half 13 is mounted in the nut mounting hole 11c.

  As shown in FIG. 1, the first nut half body 12 has an axisymmetric rotating body shape, and includes a circular first flange portion 12 a that abuts on the first surface 11 a around the nut mounting hole 11 c, And an inner cylinder portion 12b that protrudes from the flange portion 12a toward the second nut half 13. An annular first spigot fitting portion 12c protruding in a step shape protrudes from the boundary between the first flange portion 12a and the inner cylindrical portion 12b, and faces the second nut half 13 on the outer periphery of the inner cylindrical portion 12b. A conical first taper surface 12d that is tapered tapered is formed. A female screw 12e is formed at the center of the inner cylinder portion 12b.

  As shown in FIG. 2, the second nut half 13 has an axisymmetric rotating body shape, and has a circular second flange portion 13 a that contacts the second surface 11 b around the nut mounting hole 11 c, And an outer tube portion 13b protruding from the flange portion 13a toward the first nut half body 12. A stepped second spigot fitting portion 13c that is recessed stepwise is recessed in the inner periphery of the outer tube portion 13b on the second nut half 13 side, and a first nut is formed in the inner periphery of the outer tube portion 13b. A conical second tapered surface 13d that tapers toward the half 12 is formed. A through hole 13e having a diameter larger than that of the female screw 12e is formed at the center of the outer cylinder portion 13b.

  As shown in FIG. 3, the outer peripheral surface of the outer cylindrical portion 13 b of the second nut half 13 can abut on the inner peripheral surface of the nut mounting hole 11 c of the fiber reinforced resin member 11, and the first nut half 12 The outer peripheral surface of the first spigot fitting portion 12c can be fitted to the inner peripheral surface of the second spigot fitting portion 13c of the second nut half 13, and the first tapered surface 12d of the first nut half 12 is the first tapered surface 12d. The second nut half 13 can contact the second tapered surface 13d, and the female screw 12e of the first nut half 12 and the through hole 13e of the second nut half 13 are aligned coaxially.

  Next, the operation of the embodiment of the present invention having the above configuration will be described.

  As shown in FIG. 4, the outer peripheral surface of the outer cylindrical portion 13b of the second nut half 13 is inserted into the inner peripheral surface of the nut mounting hole 11c of the fiber reinforced resin member 11 from the second surface 11b side, and the second flange portion 13 a is brought into contact with the second surface 11 b of the fiber reinforced resin member 11. Subsequently, the first nut half 12 is inserted toward the second nut half 13, and the outer peripheral surface of the first spigot fitting portion 12c of the first nut half 12 is connected to the inner peripheral surface of the second spigot fitting portion 13c. The first flange portion 12 a is brought into contact with the first surface 11 a of the fiber reinforced resin member 11 by being fitted to the first surface 11 a.

  At this time, the fitting between the first spigot fitting portion 12c of the first nut half body 12 and the second spigot fitting portion 13c of the second nut half body 13 can be performed only by the finger force of the operator. It is set so that it does not separate with its own weight unless the operator pulls it with a finger after fitting.

  Subsequently, the bolt 16 penetrating the attached member 15 is screwed into the female screw 12 e of the first nut half 12 through the through hole 13 e of the second nut half 13. When the first nut half body 12 and the second nut half body 13 move in a direction approaching each other by the axial force of the bolt 16, the first and second flange portions 12a, 13a move in a direction approaching each other to move the fiber. It strongly adheres to the first and second surfaces 11a and 11b of the reinforced resin member 11. At the same time, the first tapered surface 12d of the first nut half 12 and the second tapered surface 13d of the second nut half 13 are in close contact with each other, and the second tapered surface 13d is pushed by the first tapered surface 12d. By deforming the outer cylindrical portion 13b so as to spread outward in the radial direction, the outer cylindrical portion 13b is strongly adhered to the inner peripheral surface of the nut attachment hole 11c of the fiber reinforced resin member 11.

  Since the nut 13 can be firmly integrated with the fiber reinforced resin member 11 in this way, the fastening load of the bolt 16 can be increased while the attached member 15 can be firmly fixed to the fiber reinforced resin member 11. It is possible to prevent local stress from being generated in the vicinity of the nut attachment hole 11c of the fiber reinforced resin member 11 by dispersing the nut 14 in the first flange portion 12a, the second flange portion 13a, and the outer cylinder portion 13b. .

  As described above, according to the present embodiment, when the first nut half 12 and the second nut half 13 are mounted in the nut mounting holes 11c of the fiber reinforced resin member 11, the second nut half 13 is penetrated. The nut 11 can be held on the fiber reinforced resin member 11 and the workability can be improved until the bolt 16 to be engaged is screwed into the female screw 12e of the first nut half 12 and fastened. At this time, since the load for fitting the first and second spigot fitting portions 12c and 13c to each other is sufficient by human power, it is possible to work even in a narrow place where a press-fitting machine does not enter, which is convenient. improves. Therefore, if the nut 14 of the present embodiment is applied to the cabin of the automobile constituted by the fiber reinforced resin member 11, the vehicle body parts can be efficiently attached to the cabin by screwing the bolts 16 to the nut 14. it can.

  Next, a second embodiment of the present invention will be described with reference to FIG.

  In the second embodiment, a large number of concentric circular shapes are formed on the surfaces of the first flange portion 12a of the first nut half 12 and the second flange portion 13a of the second nut half 13 facing the fiber reinforced resin member 11, respectively. Are provided with friction force increasing means 12f. By providing the first and second flange portions 12a, 13a with friction force increasing means 12f, 13f, the friction force generated between the fiber reinforced resin member 11 is increased and the slip of the nut 14 is further strengthened. Can be held.

  Next, a third embodiment of the present invention will be described with reference to FIG.

  In the third embodiment, a weakened portion 13g made of an annular groove having a triangular cross section is provided on the outer peripheral surface of the outer cylindrical portion 13b of the second nut half 13, and the first and second spigot fitting portions 12c, 13c, The positional relationship with the first and second tapered surfaces 12d and 13d is reversed. The first taper surface 12d of the first nut half 12 and the second taper surface 13d of the second nut half 13 are in close contact with each other, and the outer cylindrical portion 13b pushed by the second taper surface 13d is radially outward. When deforming so as to expand, the outer cylindrical portion 13b is easily expanded by the fragile portion 13g, so that the outer peripheral surface of the outer cylindrical portion 13b is more closely attached to the inner peripheral surface of the nut mounting hole 11c of the fiber reinforced resin member 11. Can do. At this time, the outer cylinder part 13b can be easily expanded because the 1st, 2nd taper surfaces 12d and 13d exist in the position close | similar to the weak part 13g.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, the fiber reinforced resin member 11 of the embodiment is not limited to the cabin of an automobile, and the mounted member 15 of the embodiment is not limited to a vehicle body part.

  In the embodiment, the bolt 16 inserted from the second nut half 13 side is screwed into the female screw 12e provided on the first nut half 12 side. The bolt 16 inserted from the first nut half 12 side may be screwed together.

11 Fiber reinforced resin member 11a 1st surface 11b 2nd surface 11c Nut attachment hole 12 1st nut half body 12a 1st flange part 12b Inner cylinder part 12c 1st spigot fitting part 12d 1st taper surface (taper surface)
12e Female thread 12f Friction force increasing means 13 Second nut half 13a Second flange portion 13b Outer cylinder portion 13c Second spigot fitting portion 13d Second tapered surface (tapered surface)
13g Fragile portion 13f Friction force increasing means 14 Nut 15 Mounted member (body part)
16 volts

Claims (5)

The nut-attached hole (11c) penetrating from the first surface (11a) to the second surface (11b) of the fiber reinforced resin member (11) was divided into first and second nut halves (12, 13). A nut mounting structure for mounting the nut (14),
The first nut half (12) includes a first flange portion (12a) that contacts the first surface (11a) around the nut mounting hole (11c), and the first flange portion (12a) from the first flange portion (12a). An inner tube portion (12b) protruding toward the second nut half (13), and a first spigot fitting portion (12c) formed between the first flange portion (12a) and the inner tube portion (12b). )
The second nut half (13) includes a second flange portion (13a) that contacts the second surface (11b) around the nut mounting hole (11c), and the second flange portion (13a). Between the outer cylinder part (13b) which protrudes toward the first nut half (12) and fits into the nut mounting hole (11c), and between the second flange part (13a) and the outer cylinder part (13b). A second spigot fitting portion (13c) that is formed and can be fitted to the first spigot fitting portion (12c);
A bolt (16) inserted from the other side of the inner cylinder part (12b) and the outer cylinder part (13b) on one inner peripheral surface of the inner cylinder part (12b) and the outer cylinder part (13b). A nut mounting structure in which a female screw (12e) to be screwed is formed.   Conical tapered surfaces (12d, 13d) that can be brought into contact with each other by the axial force of the bolt (16) on the outer peripheral surface of the inner cylindrical portion (12b) and the inner peripheral surface of the outer cylindrical portion (13b). The nut mounting structure according to claim 1, wherein the nut mounting structure is provided.   The nut mounting structure according to claim 2, wherein a weakened portion (13g) is provided on an outer peripheral surface of the outer tube portion (13b).   The frictional force increasing means (12f, 13f) is provided on the surface of the first flange portion (12a) and the second flange portion (13a) that contacts the fiber reinforced resin member (11). The nut mounting structure according to any one of claims 1 to 3.   The said fiber reinforced resin member (11) comprises the cabin of a motor vehicle, A vehicle body component (15) is attached to the said cabin by the said volt | bolt (16) and the said nut (14), The Claims 4-4 characterized by the above-mentioned. The nut mounting structure according to any one of the above.

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