JP7586121B2 - Fastening structure - Google Patents

Description

This specification discloses a fastening structure that fastens multiple members together with a fastening member.

For example, as disclosed in Patent Documents 1 and 2, when fastening another material to a pipe material, a collar may be inserted into the pipe material. For example, when the pipe material is a square tube, fastening holes are drilled coaxially on one side and the opposite side of the square tube. Fastening holes are also drilled in the other material. These fastening holes are aligned when fastening the other material to the square tube.

For example, the opening diameter of one fastening hole of the square tube is made larger than the outer diameter of the collar, and the collar is inserted into the square tube through this fastening hole. The opening diameter of the other fastening hole of the square tube is made smaller than the outer diameter of the collar. The collar is fixed to the square tube by welding or other means.

The bolt shank is then inserted into the fastening hole and collar of the square tube and other material, and the bolt shank is screwed into the nut positioned opposite the bolt head. The provision of a collar prevents the seating surface of the square tube from collapsing when fastened.

JP 2008-279951 A JP 2002-59770 A

When fixing the collar to the pipe material, for example as shown in FIG. 8, the tip 112 of the collar 110 is protruded from the pipe material 100, and the tip 112 and the side surface 102 of the pipe material 100 are fillet welded together as shown in the welded portion 120.

However, in this case, the tip 112 of the collar 110 will protrude from the pipe material 100, which may reduce the design (appearance) of the appearance compared to when there is no protrusion.

Therefore, this specification discloses a fastening structure that can prevent the collar from protruding from the pipe material and improve the external design of the pipe material.

This specification discloses a fastening structure. The fastening structure includes a collar, a square tube, a fastened member, a patch plate, and a welded portion. The collar is cylindrical and a bolt is inserted into the collar. The square tube includes a first pipe wall and a second pipe wall. The first pipe wall is drilled with an insertion opening into which the collar is inserted. The second pipe wall is drilled with an opposing opening that faces the first pipe wall and is coaxial with the insertion opening and has an opening diameter less than the outer diameter of the collar. The fastened member includes a flat plate portion. The flat plate portion is drilled with a fastening opening that abuts against the second pipe wall and is axially aligned with the insertion opening and the opposing opening. The patch plate is fixed to the axial end face of the collar on the insertion opening side, has an opening coaxial with the collar, and covers the insertion opening of the square tube. The welded portion joins the patch plate and the square tube.

According to the above configuration, the collar is fixed to the square tube via the patch plate. Since the collar does not need to protrude from the square tube when being fixed to the square tube, the appearance design of the square tube can be improved.

In the above configuration, the patch plate and the outer peripheral surface of the collar may be fillet welded. In this case, the opening diameter of the insertion opening of the square tube is formed to be larger than the outer diameter of the ring-shaped bead formed by the fillet weld between the patch plate and the outer peripheral surface of the collar.

If the diameter of the insertion opening is smaller than the outer diameter of the bead, the bead must be positioned outside the insertion opening, and the patch plate will protrude from the square tube accordingly. As in the above configuration, the diameter of the insertion opening is formed larger than the outer diameter of the bead, making it possible to accommodate the bead within the insertion opening.

In the above configuration, the patch plate may include a side plate portion extending along a side wall connecting the first and second tube walls of the square tube. In this case, the welded portion joins the side plate portion of the patch plate to the side wall of the square tube.

With the above configuration, dimensional variations based on the tolerance set for the axial dimension of the collar and the tolerance set for the distance between the first and second tube walls of the square tube can be absorbed by the relative movement between the side plate portion of the patch plate and the side wall of the square tube, making it possible to reliably weld the patch plate to the square tube.

The fastening structure disclosed in this specification prevents the collar from protruding from the pipe material, improving the appearance design of the pipe material.

1 is a perspective view illustrating a vehicle interior frame structure including a fastening structure having a vehicle interior structure according to an embodiment of the present invention; FIG. 2 is an enlarged perspective view of the skeletal structure of the partition wall. FIG. 2 is a perspective view illustrating a fastening reinforcement member. 4 is a perspective view showing an example in which the fastening reinforcement member of FIG. 3 is assembled to the skeleton structure of FIG. 2 . 5 is a perspective view showing an example of the skeleton structure and fastening reinforcement members of FIG. 4 when fastened and fixed. FIG. This is a cross-sectional view taken along line AA in FIG. 5. This is a cross-sectional view taken along line B-B of FIG. 5. FIG. 1 is a perspective view illustrating a conventional fastening structure.

Below, a fastening structure according to an embodiment is described with reference to the drawings. The shapes, materials, quantities, and values described below are examples for explanatory purposes and can be changed as appropriate depending on the specifications of the fastening structure. Furthermore, below, equivalent elements are given the same reference numerals in all drawings.

The fastening structure according to this embodiment is installed, for example, inside a vehicle cabin. With this in mind, in Figures 1 to 8, an orthogonal coordinate system consisting of the FR axis, the RW axis, and the UP axis is used to indicate the position and direction of each component. The FR axis is the longitudinal axis of the vehicle, with the front of the vehicle being the positive direction. The RW axis is the transverse axis of the vehicle, with the right side of the vehicle being the positive direction. The UP axis is the vertical axis of the vehicle, with the upward direction being the positive direction.

<Overall composition>
1, the fastening structure according to the present embodiment is provided in, for example, a framework structure of a partition wall that divides a driver's seat area and a passenger seat area of a vehicle cabin. For example, a vehicle having such a cabin is a passenger vehicle such as a bus.

For example, the driver's seat 60 is attached to the front of the bulkhead frame 10. Passenger seats (not shown) are attached to the rear of the bulkhead frame 10. For example, the bulkhead frame 10 is covered with an interior panel material (not shown), also known as trim, and is installed in the passenger compartment out of sight of the passengers.

As described below, the fastening structure 70 according to this embodiment includes a support 20 that is a square tube, a beam 50 that is a member to be fastened, a fastening reinforcement member 85, a bolt 71, and a nut 75 (see FIG. 6). The fastening reinforcement member 85 includes a patch plate 80 and a collar 90.

<Bulkhead structure>
1, the bulkhead framework 10 has a lattice structure in which pillars 20, 30 extending in the vertical direction are combined with beams 40, 50 extending in the vehicle width direction. For example, the pillar 20 is fastened to a framework member (not shown) under the vehicle floor via a flange 65. The pillar 30 is fastened to a framework member (not shown) under the vehicle headliner, as shown in the hatched cross section, although the illustration of the upper portion is omitted.

The pillars 20, 30 are both made of square tubes (square pipes). As described below, the lower ends of the pair of pillars 20, 20 are fixed to the vehicle compartment floor, and the beam 50 is fastened to the pair of pillars 20, 20 via fastening reinforcement members 85 according to this embodiment. With reference to FIG. 2, the pillar 20 has a first pipe wall 21, which is the rear wall, a second pipe wall 22, which is the front wall, and a pair of side walls 23, 23 that connect the vehicle width direction ends of both walls and extend in the fore-and-aft direction.

In the following, the fastening structure around the pillar 20 on the left side in the vehicle width direction is mainly illustrated using Figures 2 to 7. However, due to the structural symmetry of the vehicle, a structure similar to Figures 2 to 7 is also provided around the pillar 20 on the right side in the vehicle width direction.

An insertion opening 25 is drilled through the first pipe wall 21 of the support 20 in the thickness direction. A collar 90 (see FIG. 6) is inserted into the insertion opening 25 as described below. An opposing opening 26 is drilled through the second pipe wall 22 opposite the first pipe wall 21 in the thickness direction. The opposing opening 26 is drilled so as to be coaxial with the insertion opening 25.

Referring to FIG. 6, the opening diameter D1 of the insertion opening 25 is set to exceed the outer diameter D3 of the collar 90. For example, the opening diameter D1 of the insertion opening 25 is set to be larger than the outer diameter D2 of the ring-shaped bead 92 formed by fillet welding the collar 90 and the patch plate 80 together. By setting the opening diameter in this manner, the bead 92 can be accommodated within the insertion opening 25, and compared to the case where the bead 92 pops out of the insertion opening 25, it is possible to prevent the collar 90 and the patch plate 80 from popping out of the first pipe wall 21.

The opening diameter D4 of the opposing opening 26 is set to be less than the outer diameter D3 of the collar 90. By setting this opening diameter, the axial end of the collar 90 abuts against the second pipe wall 22. The opening diameter D4 of the opposing opening 26 is also set to exceed the shaft diameter D5 of the shaft portion 74 of the bolt 71.

Referring to FIG. 2, for example, a beam 40 is attached to the first pipe wall 21, which is the rear wall of the support 20. The beam 40 is, for example, a channel material with a Π-shaped cross section, with its opening facing forward. The beam 40 includes an upper plate portion 41 and a lower plate portion 42, both of which extend horizontally, and a rear plate portion 43, which connects the rear ends of both plates and extends vertically.

For example, in order to reduce the vehicle front-to-rear dimension of the bulkhead framework 10 (thinning the plates), notches 44 are formed in the upper plate portion 41 and the lower plate portion 42 of the beam 40 at the locations where the pillar 20 is attached. After the pillar 20 is fitted into this notch 44, as shown by the welded portion 45 in FIG. 4, the upper plate portion 41 of the beam 40 is fillet welded to the side walls 23, 23 and the first pipe wall 21 of the pillar 20. This fixes the beam 40 to the pillar 20.

Referring to Figures 1 and 2, the beam 50, which is the member to be fastened to the support pillar 20, is provided to support, for example, the driver's seat 60 on the bulkhead frame 10. For example, the rear end of a seat support member 61 provided below the driver's seat 60 is fastened to the beam 50.

Beam 50 is a channel material with a Π-shaped cross section and three flat plate sections, similar to beam 40. The opening of beam 50 faces downward. With reference to FIG. 2, beam 50 has a front plate section 51 and a rear plate section 52 that extend vertically, and an upper plate section 53 that connects the upper ends of both plates and extends horizontally.

For example, the beam 50 is attached to the front surface of the support 20. That is, during assembly, the rear plate portion 52 of the beam 50 is abutted against the second tube wall 22 of the support 20. A fastening opening 54 is drilled through the rear plate portion 52 in the thickness direction. This fastening opening 54 is aligned with the opposing opening 26 of the support 20. The opening diameter of the fastening opening 54 is, for example, the same diameter as the opposing opening 26 of the support.

<Fastening reinforcement member>
3 illustrates a fastening reinforcement member 85. Note that the scale of this figure is twice as large as that of the fastening reinforcement member 85 in, for example, FIG. 5. The fastening reinforcement member 85 includes a collar 90 and a patch plate 80.

The collar 90 is a tubular member into which the bolt 71 is inserted, and is, for example, cylindrical. With reference to FIG. 6, the axial dimension L1 of the collar 90 is, for example, the front-rear dimension of the support (the separation width between the first pipe wall 21 and the second pipe wall 22) plus the plate thickness of the first pipe wall 21 plus a predetermined margin (for example, half the plate thickness of the first pipe wall 21), which is the reference value. A tolerance is set for this reference value, and minimum and maximum values are determined. By setting the axial dimension L1 in this way, when the nut-side axial end face 90B of the collar 90 abuts against the second pipe wall 22, the patch plate 80 can abut against the first pipe wall 21.

The patch plate 80 functions as an intervening means for fixing the collar 90 to the support pillar 20. The patch plate 80 has a main plate portion 81 that abuts against the first pipe wall 21 of the support pillar 20 and covers the insertion opening 25. The main plate portion 81 is fixed to the axial end face 90A of the collar 90 on the insertion opening 25 side. The vehicle width dimension of the main plate portion 81 is determined to be equal to the vehicle width dimension of the first pipe wall 21 of the support pillar 20, for example.

The patch plate 80 also has a pair of side plate portions 82, 82, which are vertical plates extending forward from both ends of the main plate portion 81 in the vehicle width direction. With reference to FIG. 6, the side plate portions 82, 82 abut against the side walls 23, 23 of the support 20 and extend along the side walls 23, 23. Furthermore, a welded portion 84 is formed by fillet welding between the front ends of the side plate portions 82, 82 and the side walls 23, 23.

In this way, the support 20 and the patch plate 80 are joined by the welded portion 84. Furthermore, the patch plate 80 and the collar 90 are joined by the bead 92. In other words, the collar 90 is fixed to the support 20 via the patch plate 80.

The extension dimension (vehicle front-rear dimension) of the side plate portions 82, 82 is determined to be equal to or greater than the sum of the tolerance determined for the axial dimension L1 of the collar 90 and the tolerance determined for the distance between the first pipe wall 21 and the second pipe wall 22 of the support 20.

For example, referring to FIG. 6, when the axial dimension L1 of the collar 90 is at the maximum tolerance and the distance between the first pipe wall 21 and the second pipe wall 22 of the support 20 is at the minimum tolerance, the amount of protrusion of the collar 90 from the support 20 is maximized, and the main plate portion 81 of the patch plate 80 is separated from the first pipe wall 21 of the support 20.

Even in such a case, the side plate portion 82 abuts against the side wall 23 of the support 20 based on the above-mentioned dimensional settings, so it is possible to join (weld) the side plate portion 82 and the side wall 23. In other words, dimensional variations within the tolerances of the support 20 and collar 90 are absorbed by the relative movement of the side plate portion 82 and the side wall 23 while maintaining the abutting state.

In order to ensure the welded portion 84, the extension dimension of the side plate portions 82, 82 is set to be less than the longitudinal dimension of the side walls 23, 23 of the support 20.

Referring to FIG. 6, an opening 83 is drilled through the main plate portion 81 of the patch plate 80 in the thickness direction, the opening 83 being coaxial with the bore 91 of the collar 90. The opening diameter of the opening 83 is set to be less than the bore diameter of the collar 90 and greater than or equal to the shaft diameter of the shaft portion 74 of the bolt 71. The bolt 71 may be, for example, a flange bolt having a flange 73 between the head portion 72 and the shaft portion 74.

The inner cavity 91 of the collar 90 and the opening 83 of the patch plate 80 are aligned, and the axial end face 90A of the collar 90 on the insertion opening 25 side is butted against the main plate portion 81 of the patch plate 80. The outer peripheral surface of the collar 90 and the main plate portion 81 of the patch plate 80 are then fillet welded together, forming a ring-shaped bead 92. The collar 90 and the patch plate 80 are joined together by this bead 92.

<Conclusion process>
The process of fastening the beam 50 to the column 20 using the bolts 71, nuts 75, and fastening reinforcement members 85 is illustrated below. First, referring to FIG. 2 , the rear plate portion 52 of the beam 50 is abutted against the second pipe wall 22 of the column 20. During this abutment, the fastening opening 54 of the rear plate portion 52 is aligned with the opposing opening 26 of the second pipe wall 22.

Next, as illustrated in Figures 5-7, the collar 90 of the fastening reinforcement member 85 is inserted into the column 20 through the insertion opening 25 of the column 20. When the axial end face 90B of the collar 90 abuts against the second pipe wall 22 of the column 20, or when the main plate portion 81 of the patch plate 80 abuts against the first pipe wall 21 of the column 20, the pair of side plate portions 82, 82 of the patch plate 80 and the pair of side walls 23, 23 of the column 20 are fillet welded together, thereby forming a welded portion 84.

Next, the shaft 74 of the bolt 71 is inserted through the opening 83 of the patch plate 80. The shaft 74 passes through the insertion opening 25 of the strut 20, the inner cavity 91 of the collar 90, the opposing opening 26 of the strut 20, and the fastening opening 54 of the beam 50, and is screwed into a nut 75 provided on the inner surface of the rear plate 52 of the beam 50 (the surface facing the front plate 51). The nut 75 is, for example, a weld nut joined to the rear plate 52.

The bolt 71 is screwed into the nut 75, and the beam 50 is fastened to the support 20. During this fastening, a collar 90 is inserted into the support 20, which prevents the first pipe wall 21 and the second pipe wall 22 of the support 20, which form the seat, from collapsing.

In addition, because the patch plate 80 prevents the collar 90 from protruding from the pillar 20, the deterioration of the exterior design of the pillar 20 due to such protrusion is prevented. Even if the entire bulkhead framework 10 including the pillar 20 is covered by an interior panel, the amount of protrusion of the collar 90 from the pillar 20 is suppressed, so that the vehicle front-to-rear dimension of the interior panel can be reduced compared to when the collar 90 protrudes from the pillar 20.

10 bulkhead framework, 20 support (square tube), 21 first tube wall, 22 second tube wall, 23 side wall, 25 insertion opening, 26 opposing opening, 50 beam (fastened member), 51 front plate portion, 52 rear plate portion (flat plate portion), 53 upper plate portion, 54 fastening opening, 70 fastening structure, 71 bolt, 75 nut, 80 patch plate, 81 main plate portion, 82 side plate portion, 83 opening, 84 welded portion, 85 fastening reinforcement member, 90 collar, 91 inner cavity, 92 bead.

Claims (3)

A cylindrical collar into which the bolt is inserted;
a square tube including a first tube wall having an insertion opening into which the collar is inserted, and a second tube wall having an opposing opening facing the first tube wall, coaxial with the insertion opening, and having an opening diameter smaller than an outer diameter of the collar;
a fastened member having a flat plate portion abutting against the second pipe wall and having fastening openings bored therein that are aligned with the insertion opening and the opposing opening;
A fastening structure comprising:
a patch plate fixed to an axial end surface of the collar on the insertion opening side, having an opening coaxial with the collar, and covering the insertion opening of the square tube;
a welded portion that joins the patch plate and the square tube;
A fastening structure comprising: The fastening structure according to claim 1,
The patch plate and the outer peripheral surface of the collar are fillet welded together,
an opening diameter of the insertion opening of the square tube is formed larger than an outer diameter of a ring-shaped bead formed by the fillet welding between the patch plate and the outer circumferential surface of the collar;
Fastening structure. The fastening structure according to claim 1 or 2,
the patch plate includes a side plate portion extending along a side wall connecting the first tube wall and the second tube wall of the square tube,
The welded portion joins the side plate portion of the patch plate and the side wall of the square tube.
Fastening structure.