JP2009138887A - Fastener fixing structure and fastener fixing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fastener fixing structure for inexpensively fixing a fastener to a closed section structure, and to provide a fastener fixing method. <P>SOLUTION: In the fastener fixing structure, an opening 1c is formed in a wall face 1b of the long closed section structure 1 having a closed section 1a and the fastener 2 provided on the surface side of the closed section structure 1 is fastened to a fastened part 6 provided in the closed section 1a. A base member 4 has the fastened part 6, is formed larger than the opening 1c, and is arranged in the closed section 1a. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fastener fixing structure and a fastener fixing method for fastening, for example, a fastener provided outside a closed cross-section structure having a closed cross section in a vehicle body or the like to a fastened portion installed in the closed cross-section structure.

  Conventionally, as a means for fixing a fastener made of an iron bolt or nut to an aluminum structural member, for example, a fastener fixing structure disclosed in Patent Document 1 is known. The fastener fixing structure is such that an aluminum member is resistance-welded to an aluminum side surface of a base plate made of aluminum / iron clat material obtained by polymerizing aluminum material and iron material by rolling to an aluminum structural member (aluminum plate). The steel fastener is resistance welded to the iron side surface of the base plate. In this fastener fixing structure, it is possible to weld an iron fastener to a structural member made of aluminum by using an aluminum / iron clat material.

However, in the fastener fixing structure described in Patent Document 1, when the structural member is a closed cross-section structure having a closed cross section, components such as a base plate and a fastener are inserted into the closed cross section of the cylindrical member. Even if welding is attempted, there is a problem that the welding torch cannot be inserted into the closed cross section and cannot be welded.
If the closed cross-section is a huge closed cross-section structure that can be welded by inserting a welding torch, welding within the closed cross-section is possible. Since welding is performed in a limited space, there is a problem that welding work is difficult to perform.
For this reason, when parts such as base plates, fasteners, and fasteners (hereinafter simply referred to as “parts”) are fixed by welding means in the closed cross-section structure, the parts must be welded to the outer peripheral surface of the closed cross-section structure. It was limited to.

Therefore, in automobiles, in general, the following three methods are performed when components are installed in a closed section structure having a closed section.
(1) A hole having a size capable of carrying a part installed in the closed section is formed in the wall surface of the closed section structure, and the part is inserted into the closed section from the hole, thereby forming the inner wall of the closed section. How to attach to.
(2) A method of forming a closed cross-section structure having a closed cross section with two members of an outer member and an inner member having a U-shaped cross section, and forming the inner wall of the closed cross section before joining the two members. A method of attaching parts to locations in advance.
(3) A method of abolishing the installation of components in the closed section of the closed section structure and fixing the components to the outer peripheral surface of the structural member.
Japanese Patent No. 3039219

  However, in the conventional method (1) for drilling a hole in the closed cross-section structure, when a hole for carrying a component to be installed in the closed cross-section is drilled in the wall surface of the closed cross-section structure, Since the hole is larger than the part, the hole has to be closed by another member larger than the hole, and there is a problem that the number of parts and the number of work steps increase, resulting in an increase in cost.

  In the conventional method (2) for forming the closed cross-section structure with two members, the closed cross-section structure is divided into two members, so that it is easy to perform an operation of attaching components to the inner wall of the closed cross-section structure. However, after the part is mounted in the closed cross-section structure, when the two members are combined to form the closed cross-section structure, the parts become obstructive and the work is difficult to perform. There was a problem that it took too much man-hours because there were many.

  In the conventional method (3) for fixing a part to the outer peripheral surface of the structural member, the part can be easily fixed to the structural member. However, when another part (for example, a plate) is assembled to the set part by welding or the like, welding is performed. On the other hand, when there is a possibility that an external force is applied in an unfavorable peeling direction, it is necessary to extend the welding allowance and take a large amount.

  Thus, in any case of the above (1) to (3), conventionally, there is a problem that the material cost is increased due to the increase in the number of parts and the number of assembling steps and the enlargement of the parts. There was a point.

  Therefore, the present invention has been invented to solve the above-described problems, and provides a fastener fixing structure and a fastener fixing method capable of fixing a fastener to a closed cross-section structure at a low cost. Objective.

  In order to solve the above-mentioned problem, the fastener fixing structure according to claim 1, wherein an opening is formed in a wall surface of a long closed cross-section structure having a closed cross section, and the outer side of the closed cross section is provided. A fastener fixing structure for fastening a fastener and a fastened portion provided in the closed cross section, wherein a base member having the fastened portion and larger than the opening is disposed in the closed cross section. To do.

According to the first aspect of the present invention, when a fastener is fastened to a long closed cross-section structure having a closed cross-section, the fastener is fastened to the fastened portion provided in the base member in the closed cross-section. Fix the tool to the fastened part. The opening provided on the wall surface of the closed cross-section structure may be of a size that allows the fastener to be inserted therethrough, and the base member is disposed within the closed cross section that is formed to have a size capable of closing the opening. For this reason, parts, such as a base member attached in the closed cross section of a closed cross-section structure, should just be a magnitude | size which can be obstruct | occluded so that opening may overlap from the inner side of a closed cross section.
Therefore, since it is not necessary to make parts larger than necessary, such as providing a welding allowance, parts such as a base member installed to provide a fastened portion in the closed cross-section structure, these parts provided in the closed cross-section structure The size can be reduced and the weight can be minimized. Thereby, a fastener can be fixed to the closed cross-section structure at low cost.

  A fastener fixing structure according to a second aspect is the fastener fixing structure according to the first aspect, wherein the closed cross-section structure is formed of a cylindrical frame member mounted on a vehicle and at one end thereof. An opening end, the base member is inserted into the closed cross section from the opening end and disposed at a position to close the opening, and the fastener is for fixing the seat belt to the vehicle body. It is characterized in that it is screwed to the fastened portion with a seat belt anchor interposed.

  According to the second aspect of the present invention, the base member is arranged in the vehicle so as to be inserted into the closed section from the opening end of the frame member so as to close the opening. The seat belt anchor is fixed to the frame material by a fastener being screwed into a fastened portion provided in the frame material. For this reason, since the seat belt anchor can be fixed to the wall surface without providing any special member other than the fastener on the outside of the wall surface of the frame material, the outside of the frame material can have a simple structure. it can.

  The fastener fixing structure according to claim 3 is the fastener fixing structure according to claim 1 or 2, wherein the closed cross-section structure and the base member are made of aluminum or aluminum alloy. Thus, the fastener and the fastened portion are made of iron.

  According to the third aspect of the present invention, the closed cross-section structure made of aluminum or aluminum alloy and the base member made of aluminum or aluminum alloy provided in the closed cross-section structure can be fixed. An iron (steel) fastener is inserted into the closed cross-section structure by interposing a member such as a seat belt anchor from the outside of the closed cross-section structure, an aluminum or aluminum alloy closed cross-section structure, and a base member. It can be fastened to a fastened part made of iron (steel).

  The fastener fixing structure according to claim 4 is the fastener fixing structure according to claim 3, wherein the fastened portion is fixed to the base member via a bracket, and the bracket is It is made of aluminum or aluminum alloy having an engaging portion with which a fastened base provided in the fastening portion is engaged, and is welded to the base member.

  According to the fourth aspect of the present invention, the bracket made of aluminum or aluminum alloy for fixing the fastened portion to the base member engages the fastened base of the fastened portion with the engaging portion. It is fixed by welding to the member.

  According to a fifth aspect of the present invention, there is provided a fastener fixing method in which an opening is formed in a wall surface of a long closed section structure having a closed section and having an open end at one end, and is provided outside the closed section. A fastener fixing method for fastening the fastener and a portion to be fastened provided in the closed section, wherein a base member larger than the opening is inserted into the closed section from the opening end, and the closed section is inserted. After fixing with a rivet, the base member is welded into the closed section from the outside of the closed section structure, and the fastener and the fastened portion are fastened.

  According to the fifth aspect of the present invention, the base member larger than the opening of the closed cross-section structure is inserted into the closed cross section from the opening end, fixed with a rivet in the closed cross section (temporarily fixed), and then closed. The cross-sectional structure and the base member in the closed cross-sectional structure are welded on one side from the outside of the closed cross-sectional structure. By doing in this way, a closed cross-section structure and the base member in this closed cross-section structure can be welded easily, and both can be mutually fixed. In this case, by attaching a component having a fastened portion or the like to the base member, the fastener outside the closed cross-section structure can be fixed to the fastened portion provided in the closed cross-section structure.

  The fastener fixing method according to claim 6 is the fastener fixing method according to claim 5, wherein the closed cross-section structure is made of aluminum or an aluminum alloy, and is provided in the closed cross section. The base member made of aluminum or aluminum alloy is fixed with a pop rivet from the outside of the closed cross-section structure, and further welded on one side.

  According to the sixth aspect of the present invention, the base member is inserted into the closed cross section from the opening end and fixed (temporarily fixed) with the pop rivet in the closed cross section, and then the closed cross section made of aluminum or aluminum alloy is used. The structure and a base member made of aluminum or aluminum alloy in the closed cross-section structure are welded on one side from the outside of the closed cross-section structure. In this way, a closed cross-section structure made of aluminum or aluminum alloy and a base member made of aluminum or aluminum alloy in the closed cross-section structure can be easily welded to fix them together. Can do. In this case, by attaching a part having an iron (steel) fastened part or the like to the base member, an iron fastener outside the closed cross-section structure is attached to the fastened part inside the closed cross-section structure. It is possible to fix.

  According to the fastener fixing structure and the fastener fixing method according to the present invention, it is possible to provide a fastener fixing structure and a fastener fixing method capable of fixing the fastener to the closed cross-section structure at low cost.

Next, an example of a fastener fixing structure and a fastener fixing method according to an embodiment of the present invention will be described with reference to FIGS.
The fastener fixing structure and the fastener fixing method according to the present invention provide a fastening portion with a base member or the like interposed in a closed cross-section structure having a closed cross-section, and the fastener outside the closed cross-section structure is closed cross-section structure. It is fixed to the fastened part in the body. Hereinafter, as an example of an embodiment of the present invention, a seat belt anchor for fixing a seat belt mounted on a vehicle to a vehicle body is a fastener (bolt), and a fastened portion (nut) in a closed cross-section structure (side sill) The case of fixing to will be described as an example.
The description will be made assuming that the traveling direction of the vehicle is “front”, the backward direction is “rear”, and the vehicle width direction is “left” and “right”. First, before describing a fastener (bolt), a vehicle, a vehicle body, and a closed cross-section structure (side sill) to which the fastener (bolt) is fixed will be described.

  1A and 1B are views showing a fastener fixing structure and a fastener fixing method according to an embodiment of the present invention, wherein FIG. 1A is a perspective view of a side sill, and FIG. 1B is an enlarged view of a main part showing an installation state of a seat belt anchor. FIG.

≪Vehicle configuration≫
A vehicle (not shown) includes side sills 11 each having a closed cross-section structure 1 shown in FIG. 1A extending in the front-rear direction on the left and right sides of the vehicle body. The vehicle may be an automobile having the closed cross-section structure 1, and the model of the vehicle is not particularly limited. Hereinafter, the embodiment will be described by taking the side sill 11 mounted on the lower right side of the vehicle body of the passenger car as an example.
In addition to the side sill 11, the vehicle is provided with a frame member or the like as the closed cross-section structure 1 in various places, and various components are attached to the frame member and the like with fasteners (bolts 2) and fastened parts (nuts 6 ( 3))).

≪Structure of closed section structure and side sill≫
As shown to Fig.1 (a), the closed cross-section structure 1 consists of an elongate metal member which has the closed cross-section 1a at least.
The side sill 11 is a frame member formed of a light metal (hereinafter simply referred to as “aluminum”) such as an aluminum material or an aluminum alloy material for weight reduction of the vehicle, and is formed of an extruded aluminum molded product. The side sill 11 is a member that constitutes a part of the vehicle body, and is formed integrally with a front pillar, a center pillar, and the like (not shown) on the vehicle body floor portion of the vehicle. The side sill 11 has a substantially rectangular closed cross section 1 a and is formed of a long cylindrical member having open end portions 1 d and 1 d at both ends, and reinforcing members 12 are appropriately installed on the inside and outside of the side sill 11. Has been.

  As shown in FIG. 1B, a bolt 2, a seat belt anchor 3, and pop rivets 7 and 7 are installed on the wall surface 1 b of the side sill 11. A base member 4, a bracket 5, and a nut 6 are installed in the closed cross section 1a of the side sill 11 (see FIGS. 2 and 3).

  FIG. 2 is a view showing a fastener fixing structure and a fastener fixing method according to an embodiment of the present invention, and is an enlarged exploded perspective view showing a seat belt anchor attached state. FIG. 3 is a diagram showing a fastener fixing structure and a fastener fixing method according to the embodiment of the present invention, and is an enlarged exploded perspective view showing a state in which a member installed in the side sill is attached.

  As shown in FIGS. 2 and 3, an opening 1 c in which a seat portion 3 c of a seat belt anchor 3 is arranged substantially flush with a wall surface 1 b on the vehicle inner side (front side) of a substantially central portion of the side sill 11, and a pair of Rivet insertion holes 1e and 1e for inserting pop rivets 7 are formed. The opening 1c is formed in a rectangular shape that is longer than the seat 3c so that the seat 3c is in close contact with the surface of the base 4 that closes the opening 1c. The rivet insertion holes 1e and 1e are formed of, for example, a pair of holes drilled at an appropriate interval before and after the opening 1c.

≪Bolt configuration≫
As shown in FIGS. 2 and 3, the bolt 2 (fastener) is a member for fixing the seat belt anchor 3 to the base member 4 disposed in the opening 1c of the side sill 11, for example, from a general-purpose hexagon bolt Become. The bolt 2 is inserted into the bolt insertion hole 4a of the base member 4 and the bolt insertion hole 5a of the bracket 5 through the seat belt anchor 3, and is screwed into the screw hole 6a of the nut 6. Is fixed to the side sill 11. The bolt 2 and the nut 6 are made of iron (steel) or iron alloy.

≪Configuration of seat belt anchor≫
The seat belt anchor 3 is a metal fitting for fixing one end of the seat belt 8 (see FIG. 6) to the vehicle body, and is composed of a metal thick plate member that is bent in a U shape when viewed from the front. The seat belt anchor 3 includes a bolt insertion hole 3a through which the bolt 2 is inserted, a seat portion 3c that is in close contact with the surface side of the base member 4 having a bolt insertion hole 3a formed in the center, and an end of the seat belt 8 A belt insertion hole 3b through which the belt insertion hole 3b is inserted, and a belt connecting portion 3d in which the belt insertion hole 3b is formed.

≪Configuration of base member≫
As shown in FIGS. 2 and 3, the base member 4 is a member for closing the opening 1c of the side sill 11 from the inside of the closed section 1a, and is made of a flat plate-like member larger than the opening 1c. The base member 4 is made of, for example, a substantially hexagonal aluminum thick plate member. The base member 4 is formed with bolt insertion holes 4a, rivet insertion holes 4b and 4b, and positioning convex portions 4c and 4c. The base member 4 is inserted into the closed cross-section 1a by a jig (not shown) from an opening end 1d (see FIG. 1A) formed at the front and rear ends of the side sill 11, and is in a position to close the opening 1c. Positioned and arranged.

  As shown in FIG. 2, the base member 4 is fixed to the side sill 11 by welding the pop rivets 7 and 7 and the welded portions A and B by MIG welding or MIG spot welding. For example, the welded portion A that fixes the base member 4 to the side sill 11 is provided so as to be welded in the front-rear direction so as to intersect with one place on the front edge of the opening 1c. The welded portion B is provided in the opening 1c in the front-rear direction so as to cross the edge on the rear side of the opening 1c that is point-symmetric with respect to the welded portion A.

As shown in FIG. 3, the bolt insertion hole 4 a is a hole for inserting the bolt 2, and is provided at the center of the base member 4 so as to match the bolt insertion hole 3 a.
The rivet insertion holes 4b and 4b are holes through which the pair of pop rivets 7 are respectively inserted, and are provided so as to match the rivet insertion holes 1e and 1e.
The positioning convex portions 4 c and 4 c are portions for installing the bracket 5 at a predetermined position of the base member 4 by engaging with the positioning portions 5 d and 5 d of the bracket 5. The positioning convex portions 4c and 4c are provided between the bolt insertion hole 4a and the rivet insertion hole 4b so as to match the positioning portions 5d and 5d. The positioning protrusions 4c and 4c are formed in a shape that swells toward the bracket side, for example, by hitting a punch or the like on the opposite side of the base member 4 where the positioning protrusions 4c and 4c are located. The positioning projections 4c and 4c may be rod-like members or pins that are fixed to or removable from the base member 4.

≪Bracket structure≫
As shown in FIG. 3, the bracket 5 is a member for fixing the iron nut 6 to the aluminum base member 4, and is an aluminum thick plate bent in a U shape when viewed from the vehicle front-rear direction. It consists of members. The bracket 5 has a bolt insertion hole 5a, projecting pieces 5b and 5b, an engaging portion 5c, and positioning portions 5d and 5d.

The bolt insertion hole 5 a is a hole for inserting the threaded portion 2 a of the bolt 2, and is formed in the central portion of the bracket 5.
The projecting pieces 5b and 5b are respectively projected from the upper and lower ends of the bracket body 5e to the nut 6 (fastened portion) side, and support the fastened base 6b from both the upper and lower sides so that the fastened base 6b moves up and down. It is formed to prevent you from doing. The protruding pieces 5b and 5b may be either formed integrally with the bracket body 5e and bent, or welded and joined to the bracket body 5e.

The engaging portions 5c and 5c are holes for inserting the protrusions 6c and 6c provided on the upper and lower ends of the fastened base 6b, and are formed in the center of the base end of the protruding pieces 5b and 5b, respectively. .
The positioning portions 5d and 5d are portions where the positioning convex portions 4c and 4c are engaged, and are made of a semicircular shape that is notched in the center of the front and rear end portions of the bracket body 5e. The positioning portions 5d and 5d serve as a positioning member for installing the bracket 5 at a predetermined position of the base member 4, and the nut 6 and the bracket 5 rotate when the bolt 2 is rotated and tightened. And the role of the anti-rotation part that prevents the rotation. The positioning portions 5d and 5d may be any shape as long as the positioning convex portions 4c and 4c are engaged with each other, and may be circular.
The bracket body 5e is fixed to the inner side of the closed cross section of the base member 4 and has a flat, substantially rectangular shape that is formed long in the front-rear direction. When the fastening base 6b is inserted between the protruding pieces 5b and 5b and the protrusions 6c and 6c are engaged with the engaging portions 5c and 5c, the bracket body 5e is formed integrally with the nut 6. It is installed in close contact with the fastened base 6b.

As shown in FIG. 3, in the bracket 5, the bolt 2 is inserted into the bolt insertion hole 5a in a state where the positioning portions 5d, 5d are engaged with the positioning convex portions 4c, 4c and the bracket 5 is positioned on the base member 4. Then, it is fixed to the base member 4 by being screwed into the screw hole 6 a of the nut 6 and welding the welded portion C (see FIG. 2) on one end side of the bracket 5 to the base member 4.
Incidentally, the welded portion C (see FIG. 2) is a place where the bracket 5 and the base member 4 are welded by MIG welding, MIG spot welding, or the like. For example, the front end of the bracket 5 and the front end are continuous. Provided on the front upper end.

  FIG. 4 is a view showing a fastener fixing structure and a fastener fixing method according to an embodiment of the present invention, wherein (a) is a main part showing a state when a rivet is inserted into a rivet insertion hole of a closed cross-section structure. An expanded sectional view and (b) are principal part expanded sectional views which show a state when the buckling part of a rivet is crimped.

≪Pop rivet composition≫
As shown in FIGS. 4A and 4B, the pop rivet 7 (rivet) is a fastening member for fixing the base member 4 in the closed cross section 1 a of the side sill 11. The pop rivet 7 is composed of a rivet used in a well-known one-side construction method in which a sleeve 7a as a rivet body can be attached from the surface side of the side sill 11. The pop rivet 7 is mainly composed of a sleeve 7a and a pin 7b inserted into the sleep 7a so as to freely advance and retract.
The sleeve 7a is formed of a cylindrical member that is inserted into the rivet insertion holes 1e and 4e, and is formed at the end portion on the front surface side to contact the wall surface 1b of the side sill 11, and to the inner end on the closed cross section side. And a buckling portion 7d which is formed and is buckled and deformed by being pushed by the head portion 7c of the pin 7b.
The pin 7b is formed of a rod-shaped member having a head portion 7c at the end on the closed cross section side.
The sleeve 7a and the pin 7b of the pop rivet 7 are made of, for example, an aluminum material.
The pop rivet 7 is formed by inserting the rivet insertion hole 1e and the base member 4 into the rivet insertion hole 4b from the surface side of the side sill 11, and then pulling the pin 7b to the surface side by a pistol-like riveter (not shown). The head portion 7c formed at the tip of the pin 7b bites into the sleeve 7a, and the buckling portion 7d formed at the end portion of the sleeve 7a can be expanded and fixed by caulking. In addition, an extra portion of the pin 7b (a portion indicated by a two-dot chain line) is finally broken.

  FIG. 5 is an XX enlarged cross-sectional view of FIG. 1B, showing a state before the bolt is attached to the nut. FIG. 6 is an enlarged YY sectional view of FIG. 5 and shows a state after the bolt is attached to the nut.

≪Nut configuration≫
As shown in FIG. 5 and FIG. 6, the nut 6 (fastened portion) is formed between the nut 6 and the bolt 2 by screwing the screw portion 2 a of the bolt 2 (fastener) into the screw hole 6 a. It is a fixing | fixed part for fixing the interposed member. The nut 6 is formed by fixing an iron cylinder portion 6d having a screw hole 6a and an iron fastening base 6b having protrusions 6c and 6c protruding in the vertical direction integrally by welding means or the like. It is formed by integrally forming the part 6d, the fastening base 6b, and the iron material.

  The screw hole 6a is a female screw portion into which the screw portion 2a is screwed. The cylinder portion 6d is a member that forms a screw hole 6a in the center portion, and may be a general-purpose nut. The to-be-fastened base 6b is formed of a rectangular thick plate member that functions as a washer, and has a length in the vertical direction so as to be engaged between the protruding pieces 5b and 5b. The fastened base 6b is integrally formed with the cylindrical portion 6d, or the cylindrical portion 6d is integrally fixed by welding or the like. The protrusions 6c and 6c are portions that are formed so as to protrude above and below the fastening base 6b and are inserted into the engaging portions 5c and 5c.

The nut 6 engages the projections 6c and 6c with the engaging portions 5c and 5c, and screwes the screw portion 2a of the bolt 2 into the screw hole 6a to tighten the bolt, and the rear end of the base 6b to be fastened It is fixed to the bracket 5 by welding the welded portion D (see FIG. 2) of the portion to the bracket 5 and arranged so as not to move inside the closed cross section 1 a of the side sill 11.
The welded portion D (see FIG. 2) is a place where the fastened base 6b of the nut 6 and the base member 4 are welded by MIG welding, MIG spot welding, or the like. For example, the rear end of the fastened base 6b And a rear upper end continuous with the rear end.

≪Action≫
Next, with reference to FIGS. 1-6, the effect | action of the fastener fixing structure and fastener fixing method which concern on embodiment of this invention is demonstrated.
In this case, first, the protrusions 6 c and 6 c of the nut 6 shown in FIG. 3 are engaged with the engaging portions 5 c and 5 c of the bracket 5. As shown in FIG. 2, the end of the base 6b to be fastened and the bracket 5 are joined by welding a welded portion D.

  Next, as shown in FIG. 3, the bracket 5 is positioned on the base member 4 by engaging the positioning portions 5 d and 5 d of the bracket 5 with the positioning convex portion 4 c of the base member 4, as shown in FIG. 2. In this way, the end of the bracket 5 and the base member 4 are joined by welding the welded portion C. Thereby, the nut 6, the bracket 5, and the base member 4 are integrated.

The nut 6, the bracket 5 and the base member 4 integrated in this manner are held by a jig (not shown), and the closed end 1 a is opened from the open end 1 d of the side sill 11 shown in FIG. Insert and position in place. Next, as shown in FIG. 4A, the pop rivet 7 is inserted from the surface side of the side sill 11 into the rivet insertion holes 1 e and 4 e and pushed into a position where the flange portion 7 e contacts the surface of the side sill 11. As shown in FIG. 4B, when the pin 7b of the pop rivet 7 is pulled from the surface side of the side sill 11, the head 7c buckles and deforms the buckling portion 7d at the tip, and the side sill 11 and the base member 4 are deformed. And temporarily fix.
By fixing the base member 4 in the closed cross section 1a to the side sill 11 using the pop rivet 7 in this way, the rivet can be attached outside the side sill 11, and the workability is good.

In this state, as shown in FIG. 2, the side sill 11 and the base member 4 are fixed by welding the welded portions A and B. When welding the side sill 11 and the base member 4 in the closed cross section 1a, the base member 4 is fixed to the inner wall of the closed cross section 1a by the pop rivets 7, so that it is not necessary to support the base member 4. The welding operation can be performed outside the side sill 11 without inserting a welding torch into the closed cross-section structure 1. When welding, there is no obstructive member outside the side sill 11, and the welding torch can be moved freely, so that the welding operation can be easily performed and the workability is good.
Next, as shown in FIGS. 4A and 4B, the threaded portion 2a of the bolt 2 is screwed into the screw hole 6a through the bolt insertion holes 3a, 4a, 5a, so that the seat belt anchor 3 Is fixed to the base member 4.

  By doing in this way, the base member 4 larger than the opening 1c is installed in the wall surface 1b of the cylindrical cylindrical side sill 11 (closed cross-section structure 1) having the closed cross-section 1a, and the closed cross-section 1a is provided. After the base member 4 is fixed (temporarily fixed) with the pop rivets 7, the base member 4 is welded to the wall surface 1b from one side of the closed cross-section structure 1 and fixed to the wall surface 1b to fix the seat belt anchor 3 firmly. And can be fixed to the car body.

As shown in FIG. 6, the seat belt anchor 3 fixed to the base member 4 receives the tensile force pulling in the direction of arrow E (surface side direction), and the outer peripheral edge of the base member 4 is the inner wall of the closed section 1a. Since the welding parts A to D are not subjected to a large burden simply by pressing the base member 4, the base member 4 and the side sill 11 can cope with the strength of the base material.
For this reason, it is unnecessary to increase the welding portions A to D and increase the welding allowance, and it is not necessary to make the base member 4 and the bracket 5 larger than necessary. It can be minimized.

  The present invention is not limited to the above-described embodiment, and various modifications and changes can be made within the scope of the technical idea. The present invention extends to these modifications and changes. Of course.

  For example, the closed cross-section structure 1, the side sill 11, the base member 4, and the bracket 5 have been described as being made of aluminum. However, the bolt 2 and the nut 6 may be made of different materials, for example, Further, it may be a light alloy such as a magnesium alloy or a titanium alloy.

  The closed cross-section structure 1 has been described by taking the side sill 11 of the automobile as an example. However, any structure having a closed cross-section 1a may be used. It can also be applied to members used other than automobiles.

  The side sill 11 may be a member having a closed cross section 1a, and may be either a member in which a plurality of members such as an inner member and an outer member are joined, or a member having a single member. Moreover, what is necessary is just to form the shape of the closed cross section 1a in the cross-sectional shape according to each to the member installed around the side sill 11. FIG.

  Although the seat belt anchor 3 has been described as an example of the member fixed to the closed cross-section structure 1 with the bolt 2 (fastener), it is fixed to the wall surface 1b of the closed cross-section structure 1 with the bolt 2 or the nut 6. There is no particular limitation as long as it is, and other ones may be used.

  Further, the bolt 2 and the nut 6 may be arranged opposite to each other. In that case, the head of the bolt 2 is engaged between the protruding pieces 5b, 5b of the bracket 5, and the screw portion 2a is inserted into the bolt insertion holes 5a, 4a, 3a of the bracket 5 from the surface side of the seat belt anchor 3. What is necessary is just to protrude and to screw in the screw hole 6a of the nut 6, and to fasten.

Further, the bracket 5 may be omitted. That is, an iron (steel) nut 6 may be fixed to the aluminum base member 4, and the nut 6 may be directly fixed to the base member 4.
The nut 6 may be configured such that a washer portion of a general-purpose seated nut is locked to the bracket 5.

It is a figure which shows the fastener fixing structure and fastener fixing method which concern on embodiment of this invention, (a) is a perspective view of a side sill, (b) is a principal part enlarged view which shows the installation state of a seatbelt anchor. It is a figure which shows the fastener fixing structure and fastener fixing method which concern on embodiment of this invention, and is an expansion disassembled perspective view which shows the attachment state of a seatbelt anchor. It is a figure which shows the fastener fixing structure and fastener fixing method which concern on embodiment of this invention, and is an expansion disassembled perspective view which shows the attachment state of the member installed in the side sill. It is a figure which shows the fastener fixing structure and fastener fixing method which concern on embodiment of this invention, (a) is a principal part expanded sectional view which shows a state when a rivet is inserted in the rivet insertion hole of a closed cross-section structure, (B) is a principal part expanded sectional view which shows a state when the buckling part of a rivet is crimped. It is XX expanded sectional view of Drawing 1 (b), and shows the state before attaching a bolt to a nut. FIG. 6 is a YY enlarged cross-sectional view of FIG. 5, showing a state after the bolt is attached to the nut.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Closed cross-section structure 1a Closed cross section 1b Wall surface 1c Opening 1d Opening end part 2 Bolt (fastener)
3 Seat belt anchor 4 Base member 5 Bracket 6 Nut (fastened part)
6b Base to be fastened 7 Pop rivet (rivet)
8 Seat belt 11 Side sill

Claims (6)

Fastener fixing that opens an opening in the wall surface of a long closed cross-section structure having a closed cross section and fastens the fastener provided outside the closed cross section and the fastened portion provided in the closed cross section. Structure,
A fastener fixing structure comprising a base member having the fastened portion and being larger than the opening in the closed cross section. The closed cross-section structure is composed of a cylindrical frame member mounted on a vehicle, and has an open end at one end thereof.
The base member is inserted into the closed cross section from the opening end, and is disposed at a position to close the opening.
2. The fastener fixing structure according to claim 1, wherein the fastener is screwed into the fastened portion via a seat belt anchor for fixing a seat belt to a vehicle body. The closed cross-section structure and the base member are made of aluminum or aluminum alloy,
The fastener fixing structure according to claim 1 or 2, wherein the fastener and the fastened portion are made of iron. The fastened portion is fixed to the base member via a bracket,
The bracket is made of aluminum or aluminum alloy having an engaging portion with which a fastened base provided on the fastened portion is engaged, and is welded to the base member. Item 4. The fastener fixing structure according to Item 3. An opening is formed in the wall surface of a long closed cross-section structure having a closed cross section and an open end at one end, and the fastener provided outside the closed cross section and a cover provided in the closed cross section. A fastener fixing method for fastening a fastening part,
A base member larger than the opening is inserted into the closed section from the end of the opening and fixed with a rivet in the closed section, and then the base member is welded into the closed section from the outside of the closed section structure. And the fastener fixing method characterized by fastening the said fastener and the said to-be-fastened part.   The closed cross-section structure is made of aluminum or aluminum alloy, the base member made of aluminum or aluminum alloy provided in the closed cross-section is fixed with pop rivets from the outside of the closed cross-section structure, and The fastener fixing method according to claim 5, wherein one-side welding is performed.

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