JP3196442B2 - Connecting structure of the seat bracket mounting part to the vehicle body floor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for connecting a seat bracket mounting portion to a vehicle body floor which is applied when a seat bracket of a vehicle seat is fixed to a vehicle body floor via a seat bracket mounting portion.

[0002]

2. Description of the Related Art A vehicle seat is mounted on a vehicle body by providing a seat bracket mounting portion at a joint portion between a floor panel and a rocker inner panel of the vehicle body, and fixing the seat bracket of the vehicle seat to the seat bracket mounting portion. The structure has already been devised (for example,
See Japanese Utility Model Application Laid-Open No. 62-100276). Hereinafter, this structure will be described.

As shown in FIG. 5, in the structure disclosed in this publication, a step 102 is formed at an end in the width direction of a floor panel 100, and a rocker inner panel 104 is formed at an end of the step 102. Are welded. Also, step 1
A part of 02 extends to the vehicle cabin side and serves as a seat bracket mounting portion 102A. A bead 106 formed by melting metal is attached to the seat bracket mounting portion 102A.
Is provided so as to cross over the surface of the "cross". Thereby, the strength of the seat bracket mounting portion 102A is improved.

The above-mentioned seat bracket mounting portion 102A
A seat bracket 108 having a prism shape is placed on an upper end surface of the seat bracket 108, and in this state, a lower end flange 108A of the seat bracket 108 is welded to an upper end surface of the seat bracket mounting portion 102A. It should be noted that a reinforcing member 110 is provided between the seat bracket 108 and the rocker inner panel 104 so as to be reinforced.

[0005]

However, in the case of the structure disclosed in this publication, since the bead 106 is provided so as to "cross" the surface of the seat bracket mounting portion 102A, the bead 106 is provided. 1
The strength of 02A is increased as a whole. In other words, the beads 106 increase the strength of the seat surface to which the seat bracket 108 is attached, so that the load acting on the seat bracket 108 can be reliably reduced to the floor panel 10.
It can be said that it is a mere reinforcing bead for transmitting to zero.

Accordingly, the lower end flange 108 of the seat bracket 108 is caused by the metal fatigue of the seat bracket mounting portion 102A due to the repeated load applied from the vehicle seat.
Deformation occurs at the welding position (weld end) of A to the seat bracket mounting portion 102A, and a load in the shear direction acts on the welding position. For this reason, conventionally, the fixing strength by welding has been improved by taking measures such as increasing the number of spot welding points in consideration of the load in the shear direction.

In view of the above facts, the present invention prevents a load in the shearing direction from acting on a welded portion, thereby improving the fixing strength of welding. The goal is to obtain

[0008]

According to a first aspect of the present invention, there is provided a structure for connecting a seat bracket mounting portion to a vehicle body floor, wherein the vehicle body floor is formed at a seat bracket mounting portion to which a seat bracket of a vehicle seat is fixed. A weld having a predetermined width to be welded to a floor panel to be provided is provided, and a bead having a length straddling the weld is provided at a position where the floor panel abuts on the weld and does not overlap with a welded portion. It is characterized by: Claims
Body flow of the seat bracket mounting portion according to the invention described in 2 above
The connecting structure to the seat bracket is
In the joint structure of the attachment portion to the vehicle body floor, the welding portion
Is spot-welded to the floor panel at multiple locations
The bead is located between the spot welds
It has been characterized.

[0009]

In general, metal fatigue may occur in the vicinity of a portion of the floor panel where the seat bracket attachment portion comes into contact with the welded portion due to the repeated load applied from the vehicle seat.

However, according to the first aspect of the present invention,
Since a bead having a length straddling the welded portion is provided at a position where the floor panel abuts on the welded portion and does not overlap the welded portion, the bead forming portion on the floor panel has high strength. For this reason, the load does not deform the bead forming portion, and the deformation occurs in the portion where the strength changes (near the end of the bead). In other words, by providing the bead, a portion remote from the welding location (weld end) can be intentionally deformed, and the weld end does not deform. Therefore, the load in the shear direction does not act on the welded portion, and only the load in the tensile direction acts. Further, according to the second aspect,
According to Ming, the weld of the seat bracket mounting part is the floor
Spot welding is performed on the panel at
Since the above beads were placed between the spot welds,
The panel and the welded part of the seat bracket
There is a discontinuity in the weld line at the bead installation part as in the case of
The welding area (the area that can be welded)
And suitable.

As a result, when the number of welding points is the same as the conventional one, the bonding strength of welding can be improved more than before, and when the bonding strength is the same as the conventional one, the number of welding points can be reduced more than before. it can.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, a vehicle seat 10 is provided.
Is provided with a seat bracket 16 having a circular hole 14 in the center. In addition, an upper rail (not shown) is provided below the seat cushion 12, and the upper rail is slidably supported by the lower rail. The above-mentioned seat bracket 16 is fixed to the front end, rear end or front and rear end of the lower end of the lower rail.

On the other hand, the floor panel 18 on which the vehicle seat 10 is assembled has a widthwise end portion which is bent at a gentle slope, and further, an outer end thereof is bent further toward the upper side of the vehicle (hereinafter, a gentle slope). The portion bent at is referred to as "inclined portion 18A" and the outer end thereof is referred to as "bent portion 18B." The bent portion 18B of the floor panel 18 is fixed by welding to the inner lower end of the rocker inner panel 20 having a hat-shaped cross section at right angles to the longitudinal direction. Thus, the floor panel 18 and the rocker inner panel 20 are connected. A rocker outer panel having substantially the same hat shape in section is fixed to an open end of the rocker inner panel 20, so that the rocker inner panel 20 and the rocker outer panel have a closed cross section. Rockers are formed.

The joint between the floor panel 18 and the rocker inner panel 20 has a seat bracket mounting portion 2.
2 is fixed. As shown in FIG. 2, the seat bracket mounting portion 22 includes a cylindrical fixing portion 22A disposed at a central portion, a linear rocker inner welding portion 22B bent from the upper end of the fixing portion 22A, Fixed part 22A
U-shaped floor panel welded portion 22C bent from the lower end portion, and a U-shaped connection portion 22D connecting both ends of the rocker inner welded portion 22B and both ends of the floor panel welded portion 22C. And consisting of

The rocker inner welding portion 22B is brought into contact with the indoor side surface of the rocker inner panel 20, and in this state,
It is fixed at spots (equal intervals) by spot welding. On the other hand, the floor panel welding portion 22C is in contact with the inclined portion 18A of the floor panel 18 and is fixed in this state by spot welding at five locations (equal intervals). Thus, the seat bracket mounting portion 22 is connected to the floor panel 18 and the rocker inner panel 20 so as to straddle the two.

The upper end (top) of the fixing portion 22A is a horizontal surface, and a circular hole 24 is formed at the center thereof coaxially with the circular hole 14 of the seat bracket 16 described above. Further, a weld nut 26 is welded to the back surface of the upper end of the fixing portion 22A. By aligning the axes of the circular holes 14 and 24 with each other and then screwing a bolt (not shown) into the weld nut 26, the seat bracket 16 is attached to the seat bracket mounting portion 2.
Fixed to 2.

Here, the inclined portion 18A of the floor panel 18
Is formed with a pair of beads 28. The position at which these beads 28 are formed depends on the welding portion 2 for the floor panel.
Both sides sandwich the central welding point in 2C. The direction in which each bead 28 is formed is the width direction (vehicle width direction) of the inclined portion 18A. Furthermore, the formation length of each bead 28 is slightly longer than the width of the floor panel welded portion 22C in the vehicle width direction, and thus straddles the floor panel welded portion 22C. Moreover,
The cross-sectional shape of each bead 28 at right angles to the longitudinal direction is a U-shape that is open at the top, that is, a concave shape.

The operation of this embodiment will be described below. The seat bracket mounting portion 22 is temporarily placed so that the seat bracket mounting portion 22 straddles the connecting portion (bent portion 18B) between the floor panel 18 and the rocker inner panel 20. At this time, the floor panel welding portion 22C of the seat bracket attachment portion 22 closes the longitudinal middle portion of the pair of beads 28 formed on the floor panel 18, that is, the bead 28 straddles the floor panel welding portion 22C. The seat bracket mounting portion 22 is temporarily placed.

Then, the rocker inner welding portion 22B of the seat bracket mounting portion 22 is spot-welded. At this time, spot welding is performed at a total of three places at both ends and an intermediate part of the rocker inner welding portion 22B.

Next, spot welding is performed from the side of the floor bracket welding portion 22C of the seat bracket mounting portion 22. At this time, between each pair of beads 28 (one location), each bead 28
Are spot-welded at a total of five locations on the outside (two locations) and at the end (two locations) on the connection portion 22D side of the floor panel weld 22C.

Finally, after the seat bracket 16 of the vehicle seat 10 is placed on the upper end surface of the fixing portion 22A of the seat bracket attaching portion 22, after the mutual circular holes 14, 24 are positioned so as to be coaxial. The vehicle seat 10 is assembled to the floor panel 18 via the seat bracket 16 and the seat bracket mounting portion 22 by screwing a bolt (not shown) into the weld nut 26.

Here, when the vehicle is in a running state or the seat back is tilted after the assembling operation is completed, a repeated load in the vertical direction of the vehicle is applied from the vehicle seat 10 to the seat bracket 16 via the seat bracket 16. Part 22 and the inclined part 18A of the floor panel 18. Therefore,
Metal fatigue occurs in the inclined portion 18 </ b> A of the floor panel 18, and deformation occurs near the seat bracket attachment portion 22. In such a case, since the portion where the bead 28 is formed has high strength, the bead 28 itself does not deform, and deformation occurs near the end of the bead 28 where the strength changes (FIG. 3). (A)).

This will be briefly described below in relation to the prior art. FIG. 3B shows a conventional structure in which the bead 106 (see FIG. 5) is not provided (note that, in order to compare with the present embodiment, the shape and the like of the parts are the same as those of the present embodiment, and the same part numbers are used. ), The deformation is concentrated on the welded end 30 in the case of the conventional structure as can be seen from this figure. When the bead 106 (see FIG. 5) described in the section of the related art is provided on the surface of the seat bracket mounting portion 102A, the bead 106 is merely a reinforcing bead as described above, Can be slightly suppressed, but the deformation mode itself does not change.

As described above, in this embodiment, the bead 28 having a predetermined shape is formed so as to straddle the floor panel welding portion 22C at the contact position of the floor panel welding portion 22C of the seat bracket attachment portion 22 on the floor panel 18. So
Deformation can be positively generated at a portion (near the end of the bead 28) away from the welding location (weld end), thereby preventing deformation at the welding location (weld end). Therefore, the load in the shear direction does not act on the welding location (weld end),
Only the load in the tensile direction can be applied.

As a result, when the number of welding points is the same as in the conventional case, the fixing strength of welding can be improved as compared with the conventional case. Conversely, when the fixing strength is the same as the conventional one, the number of welding points can be reduced as compared with the conventional case, and the thickness of the floor panel 18 can be reduced.

In the present embodiment, a pair of beads 28 whose longitudinal direction is the vehicle width direction is formed at a predetermined position on the inclined portion 18A of the floor panel 18, but the present invention is not limited to this, and as shown in FIG. Alternatively, a bead 32 whose longitudinal direction is substantially the front-rear direction of the vehicle may be added. In this case, the bead 28 has a large effect of preventing deformation in which a polygonal line is formed mainly in the vehicle front-rear direction, and the bead 32 has a large effect of preventing deformation in which a polygonal line is formed mainly in the vehicle width direction.

The shape of the beads 28 and 32 is not limited to a concave shape, but may be a wave shape, a structure in which a core material is inserted and fixed in the concave portion, a structure in which partition walls are arranged at predetermined intervals and fixed, and the like. May be.

Further, in addition to providing the bead 28 on the floor panel 18, a configuration may be adopted in which the bead 28 is provided on the rocker inner panel 20 so as to correspond to the rocker inner welding portion 22B.

Further, in the present embodiment, the seat bracket mounting portion 22 is provided at the connecting portion between the floor panel 18 and the rocker inner panel 20. However, the present invention is not limited to this, and the seat bracket is provided on the inclined portion 18A of the floor panel 18. Mounting part 2
2 may be provided.

[0031]

As described above, the structure for connecting the seat bracket mounting portion to the vehicle body floor according to the present invention is at the position where the seat bracket mounting portion abuts on the welded portion of the floor panel and does not overlap with the welded portion. Since a bead with a length that straddles this welded portion is provided at the position, only a load in the tensile direction is applied to the welded portion, so that the fixing strength by welding can be improved, and the number of welding points can be reduced. It has an excellent effect that it can be produced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a seat bracket of a vehicle seat and a seat bracket mounting portion disposed on a bead are separated according to the embodiment.

FIG. 2 is an enlarged view of a main part, showing the vicinity of a seat bracket mounting portion shown in FIG. 1 in an enlarged manner.

FIG. 3A is a sectional view taken along line 3 (A) -3 (A) in FIG. 2, and FIG. 3B explains the operation and effect of the present embodiment in relation to the prior art. FIG. 3 is an explanatory view corresponding to FIG.

FIG. 4 is a perspective view corresponding to FIG. 2 showing a modification.

FIG. 5 is a perspective view showing a conventional example.

[Explanation of symbols]

 10 Vehicle Seat 16 Seat Bracket 18 Floor Panel 22 Seat Bracket Attachment 22C Floor Panel Welded Part 28 Bead 32 Bead

Claims (2)

(57) [Claims] 1. A seat bracket mounting portion to which a seat bracket of a vehicle seat is fixed is provided with a welding portion having a predetermined width to be welded to a floor panel constituting a vehicle body floor. A bead having a length straddling the welded portion is provided at a position that is in contact with the welded portion and does not overlap the welded portion, wherein a seat bracket attachment portion is connected to a vehicle body floor. 2. The floor panel according to claim 2 , wherein a plurality of the welds are provided on the floor panel.
Spot welded at a point, the bead is located between the spot weld points
And, seat bracket mounting according to claim 1, wherein the
Structure of the part to the vehicle body floor.