JP3815290B2 - Mounting structure for vehicle seat belt - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle seat belt mounting structure in which a buckle to which a front end of a seat belt is fastened is mounted on a vehicle body side.
[0002]
[Prior art]
Conventionally, a method of attaching a seat belt buckle to the vehicle body side is known as disclosed in Japanese Patent Application Laid-Open Nos. 5-49521 and 9-71166.
[0003]
This known technique is mainly applied to a seat belt in a rear seat of a truck, a rear seat of a two-row type passenger car, or a rear seat of a three-row type passenger car, and a bench seat for a plurality of passengers.
[0004]
This known technique is premised on a type in which the sheet is folded as necessary and then tilted forward or removed.
[0005]
Taking the folding type as an example, the front part of the seat cushion is pivotally mounted around the horizontal axis on the vehicle body side, while a latch is provided at the rear part of the seat cushion, and a striker on which the latch is engaged and disengaged is provided on the vehicle body side When it is desired to widen the rear space, the seat back is tilted forward with the latch removed from the striker, and the entire seat is rotated forward about the horizontal axis.
[0006]
On the other hand, a connecting belt is attached to a buckle to which the front end of the seat belt is fixed, and the connecting belt is put out rearward of the seat through a tunnel-like hole provided in the seat cushion, and the end of the connecting belt is fixed to the latch.
[0007]
In this way, the buckle is attached to the vehicle body side via the latch and striker, and the upper load acting on the seat belt is applied to the vehicle body in the event of a forward collision (hereinafter, this collision is called a front collision and a rear collision). It is the structure which supports on the side.
[0008]
[Problems to be solved by the invention]
However, according to this known technique,
( I ) When a large tensile load is applied to the buckle attachment point from the seat belt to the buckle attachment point before and after the rear impact, the buckle attachment point may come off without supporting the load.
[0009]
( II ) At the time of a rear impact, the load input from the rear end cross member is applied to the striker fixed to the vehicle body, causing the striker to deform and break, and the tip engages with this latch, i.e., the buckle. There is a risk that the seat belt attached to the seat will come off.
[0010]
On the other hand, in vehicles, there are laws and regulations (ECE32 requirement: the forward movement of the rear seat H / P part ≦ 75mm etc.) to secure the cabin living space at the time of rear collision, and as a countermeasure, absorb the rear input load Thus, although it is necessary to reduce the forward movement of the seat, the known seat belt mounting structure is not particularly taken as a countermeasure against the rear input load.
[0011]
Accordingly, the present invention provides a vehicle seat belt mounting structure that prevents the seat belt from coming off due to a load at the time of front and rear collisions, and that can exhibit a function of absorbing a rear input load at the time of rear collision. is there.
[0012]
[Means for Solving the Problems]
According to the first aspect of the present invention, a bracket having a U-shaped front section having a bottom wall and left and right side walls extends in the front-rear direction at the center in the vehicle width direction below the floor panel and has a closed cross section with the floor panel. are arranged in a state of constituting, while the rear end of the bracket is attached to the rear end cross member, the buckle of the seat belt for the rear seat is attached to the bottom wall of the upper Symbol bracket through the rear seat, and the bracket In the rear part of the left and right side walls of the buckle, a heel bead is provided that forms a fragile part that exerts a reinforcing action against a load in the vertical direction and easily deforms with respect to the load from the rear. It is.
[0013]
A second aspect of the present invention, in the configuration of claim 1, the bottom wall of the bracket, in which a horizontal bead left and right ends are connected to the lower end of the vertical beads were kicked set.
[0014]
According to a third aspect of the present invention, in the configuration of the first or second aspect, the seat is configured as a bench seat for a plurality of persons, and at least the rear side includes a seat side latch and a vehicle body member side striker. It is detachably attached to the vehicle body member via a lock mechanism, and a seat belt buckle is attached to the latch.
[0015]
According to a fourth aspect of the present invention, in the configuration of the third aspect, the rear side of the seat is detachably attached to the vehicle body member via the lock mechanism only at the central portion in the width direction, and is supported by the vehicle body member at three points. A three-point support type seat belt buckle is attached to the latch of the lock mechanism.
[0016]
According to a fifth aspect of the present invention, in the configuration of the third or fourth aspect, the striker is attached across the bracket and the rear cross member in front of the bracket.
[0017]
According to a sixth aspect of the present invention, in the configuration of the fifth aspect, the front end of the bracket is attached to the rear cross member, and the first and second mounting seats having a hat-shaped cross-sectional view are provided. The mounting seat is attached to the bottom wall of the bracket in a state extending in the vehicle width direction, and the second mounting seat is attached to the bottom wall of the rear cross member in a state of forming a closed cross section with the rear cross member, The striker is mounted across the first and second mounting seats.
[0018]
According to the above configuration,
(I) Since the heel bead is provided on the bracket to which the buckle of the seat belt is attached, the bracket is effectively reinforced by the heel bead against the vertical load. For this reason, there is no possibility that the bracket will be deformed or damaged even if a large pulling load is applied to the bracket from the seat belt to the bracket as in front and rear collisions.
[0019]
(Ii) Since the heel bead is provided, the rear portion of the bracket from the heel bead becomes a relatively fragile portion, so that the fragile portion preferentially deforms and breaks to absorb the impact at the time of rear collision .
[0020]
In this case, the bracket has a U-shaped front sectional view, and in the state of forming a closed cross section with the floor panel, it is arranged in the front-rear direction at the center in the vehicle width direction below the floor panel, and its rear end is the rear end cross member Since it is attached, it is possible to absorb the impact at the center in the vehicle width direction and protect the front part including the buckle attachment point.
[0021]
By the action of the two points, before, with the edge of the seat belt can prevent the rear end collision, it is possible to suppress the forward movement of the sheet over preparative and Ru can improve the impact absorbing performance of a rear-end collision .
[0022]
In particular, according to the configuration of claim 2, since the bracket bottom wall is also provided with a horizontal bead continuous to the heel bead, the rear fragile portion of the bracket is more easily deformed and broken, and the impact of (ii) above. Absorption effect is enhanced.
[0023]
Further, as in claims 3 to 5, the tensile load from a plurality of persons sitting on the bench seat is concentrated directly on the bracket via a lock mechanism (latch, striker) for detachably attaching the seat to the vehicle body member. Even in the case of adopting a configuration that acts as described above, it is possible to reliably prevent the seat belt from coming off by the function (i).
[0024]
Furthermore, according to the configuration of claim 5, the striker is mounted across the bracket and the rear cross member in front of the bracket, and the load acting on the seat at the time of front and rear collisions is shared by both cross members. The mounting strength is improved.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
[0026]
In this embodiment, as shown in FIGS. 1 and 2, a bench seat (hereinafter simply referred to as a “seat”) 1 for two persons is mounted on the vehicle body via a lock mechanism 2 at the center in the width direction at the rear portion of the seat cushion 1a. As shown in a phantom line in FIG. 1, if necessary, the seat cushion 1a is detachably attached to the front side and the left and right sides of the front part of the seat cushion 1a are pivotably attached to the horizontal axis by the hinge mechanism 3 to widen the rear space in the vehicle. Thus, a vehicle in which the seat back 1a is folded toward the seat cushion 1a and the entire seat 1 is rotated forward is taken as an example of application.
[0027]
As shown in FIG. 2, the seat belts 4 and 4 are configured as a three-point support type that is supported at a total of three points, two on the side of the vehicle body and one on the center.
[0028]
Connecting belts 6 and 6 are attached to the buckles 5 and 5 for fastening the front end of the seat belts 4 and 4 on the vehicle body center side, and the connecting belts 6 and 6 are tunnel-shaped holes provided in the seat cushion 1a. (not specifically shown) are led out to the seat backward through, its out end is attached et al is the latch 7 of the lock mechanism 2.
[0029]
Thus, one of the three points of the seat belts 4 and 4 is fixed to the vehicle body side via the lock mechanism 2. In FIG. 1 etc., 8 is a floor panel.
[0030]
The lock mechanism 2 is generally composed of a seat side latch 7 and a vehicle body side striker (pin) 9 with which the latch 7 is detachably engaged. 1-4, 10 is a lock lever for unlocking operation, and 11 in FIG. 4 is a lock spring.
[0031]
As shown in FIG. 3, the striker 9 is mounted between the rear cross member 14 and the bracket 13 mounted across the rear end cross member 12 below the floor panel and the rear cross member 14 in front thereof. It has been.
[0032]
As shown in FIGS. 3 and 5 to 7, the bracket 13 is formed in a U-shaped cross section having a horizontal bottom wall 15 and left and right side walls 16, 16. It is attached to the members 12 and 14, and both ends of the striker 9 are bolted to the center of the bottom wall of the bracket 13 and the upper surfaces of the mounting seats 17 and 18 having a hat-shaped cross section attached to the rear cross member 14, respectively. ing.
[0033]
The brackets 13, left and right side walls 16 and 16 intermediate the back inner surface to the rear vertical bead 19, 19 (rear portion than the mounting seat 17 is a buckle attachment point) in, the front inner surface to the front vertical bead 20, 20 Are provided, and a horizontal bead 21 is provided at the middle rear portion of the bottom wall 15 in a state of being connected to the rear side bead 19, 19 at both left and right ends thereof.
[0034]
The heel beads 19 and 20 and the horizontal beads 21 on both the front and rear sides are formed by causing the side walls 16 and 16 and the bottom wall 15 to bulge inward in a substantially semicircular shape at the press molding stage of the bracket 13.
[0035]
According to this configuration, the front diagonally upward pulling load W1 (shown in FIG. 3) acting on the seat belt 4 at the time of front and rear collisions is the connecting belt 6, the latch 7 of the lock mechanism 2, the striker 9, the mounting seat. 17 and 18 are transmitted to the bracket 13 (rear end cross member 12 and rear cross member 14).
[0036]
In this case, a tensile load from a plurality of persons sitting on the seat (bench seat) 1 acts directly and concentrated on the bracket 13 and the rear cross member 14.
[0037]
Here, since the left and right saddle beads 19, 20 are provided on the rear side and the front side of the bracket 13, the bracket 13 is effectively reinforced against the vertical load by the saddle beads 19, 20. For this reason, there is no possibility that the bracket 13 is deformed or broken even when a large tensile load W1 is applied.
[0038]
Moreover, by providing the rear side bead 19, the portion S (shown in FIGS. 6 and 7) behind the rear side bead 19 in the bracket 13 is relatively fragile relative to other parts. Become. In addition, since the horizontal bead 21 is also provided on the bottom wall 15 in succession to the heel bead 19, the rear fragile portion S becomes more fragile, and the rear load W2 input to the rear end cross member 12 at the time of a rear collision. By this, this weak part S deform | transforms and destroys preferentially, a shock is absorbed, and the front part including the buckle attachment point by the attachment seat 17 can be protected.
[0039]
Therefore, by these actions, there is no possibility that the buckle attachment point is broken at the time of front and rear collisions and the seat belts 4 and 4 in FIG. 2 are detached.
[0040]
Further, since the transmission of the rear impact load W2 to the rear cross member 14 can be suppressed by the impact absorbing action by the rear weak portion S of the bracket 13, the forward movement of the seat can be suppressed.
[0041]
Further, the striker 9 of the lock mechanism 2 is mounted across the bracket 13 and the rear cross member 14 in front of the bracket 13, and the bracket 13 is mounted between the rear end and the rear cross members 12, 14. The load acting on the seat 1 at the time of a rear collision is shared by the cross members 12 and 14. For this reason, the attachment strength of the seat 1 is improved, and the effect of suppressing the forward movement of the seat 1 at the time of a rear collision becomes higher.
[0042]
Other Embodiments (1) Regarding the beads, in the above embodiment, the bead beads 19 and 20 are provided on both the rear side and the front side of the left and right side walls 16 and 16 of the bracket 13, and the horizontal bead 21 is provided on the bottom wall 15. However, only the rear side bead 19 may be provided. Even in this case, the purpose of creating the weakened portion S against the rear impact load W2 at the rear portion from the striker attachment point and the purpose of reinforcing the bracket 13 against the tensile load W1 from the seat belt 4 can be achieved.
[0043]
(2) Although the front mounting seat 18 different from the bracket 13 is provided on the rear cross member 14 in the above embodiment, the bracket 13 is elongated in the front-rear direction, and the front mounting seat 18 is provided at the front end portion thereof. May be mounted across both side mounting seats 17 and 18 of the bracket 13.
[0044]
(3) In the above-described embodiment, the buckle 5 of the seat belt 4 is attached to the bracket 13 and the rear cross member 14 via the seat mounting lock mechanism 2. However, the buckle 5 is directly attached to the bracket 13, Alternatively, it may be mounted across the bracket 13 and the rear cross member 14.
[0045]
(4) In the above-described embodiment, a vehicle in which the rear portion of the seat 1 is attached to the vehicle body side at the center in the width direction and the seat 1 is rotated forward as necessary is exemplified as an application object. The present invention can also be applied to a vehicle having a configuration in which the rear portion of the seat 1 is attached to the vehicle body side on both the left and right sides, or a vehicle in which the entire seat 1 is detachable.
[0046]
【The invention's effect】
As described above, according to the present invention, the heel bead is provided at the rear portion of the bracket to which the seat belt buckle is attached, so that the bracket is effectively reinforced with respect to the vertical load by the heel bead. be able to. For this reason, there is no possibility that the bracket will be deformed or damaged even if a large pulling load is applied to the bracket from the seat belt to the bracket as in front and rear collisions.
[0047]
Moreover, since the rear portion of the bracket is relatively weakened by the provision of the bead bead, the weakened portion is preferentially deformed and broken during the rear-end collision to absorb the impact .
[0048]
In this case, the bracket has a U-shaped front sectional view, and in the state of forming a closed cross section with the floor panel, it is arranged in the front-rear direction at the center in the vehicle width direction below the floor panel, and its rear end is the rear end cross member Since it is attached, it is possible to absorb the impact at the center in the vehicle width direction and protect the front part including the buckle attachment point.
[0049]
By the action of the two points, before, with the edge of the seat belt can prevent the rear end collision, it is possible to suppress the forward movement of the sheet over preparative and Ru can improve the impact absorbing performance of a rear-end collision .
[Brief description of the drawings]
FIG. 1 is a schematic side view showing an embodiment of the present invention.
FIG. 2 is a schematic plan view of the same.
FIG. 3 is a partially enlarged cross-sectional view of the same embodiment.
4 is an enlarged sectional view taken along line IV-IV in FIG. 3;
FIG. 5 is a perspective view of a bracket according to the embodiment.
FIG. 6 is a plan view of the bracket.
7 is a cross-sectional view taken along line VII-VII in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Seat 4 Seat belt 5 Seat belt buckle 2 Lock mechanism 7 Lock mechanism latch 9 Same striker 13 Bracket 15 Bracket bottom wall 16, 16 Left and right side walls of bracket 17 Strike mounting seat 19, 19 竪 Bead 21 Horizontal bead S脆弱 Fragile part behind the bead 12 Rear end cross member as a car body member 14 Rear cross member 18 Mounting seat for rear cross member striker

Claims (6)

A bracket having a U-shaped front section with a bottom wall and left and right side walls is disposed in a state of extending in the front-rear direction at the center in the vehicle width direction below the floor panel and forming a closed section with the floor panel, while the rear end of the bracket is attached to the rear end cross member, the buckle of the seat belt for the rear seat is attached to the bottom wall of the upper Symbol bracket through the rear seat and the buckle in the right and left side walls of the bracket A vehicular seat provided with a heel bead that forms a fragile portion that exhibits a reinforcing action against a load in the vertical direction and that is easily deformed with respect to a load from the rear, at a rear portion of the attachment point. Belt mounting structure.   2. The vehicle seat belt mounting structure according to claim 1, wherein a horizontal bead having left and right ends connected to the lower end of the heel bead is provided on the bottom wall of the bracket.   The seat is configured as a bench seat for a plurality of people, and at least the rear side is detachably attached to the vehicle body member via a lock mechanism having a seat side latch and a vehicle body member side striker. The seatbelt mounting structure for a vehicle according to claim 1 or 2, wherein the buckle is attached to the latch.   The rear side of the seat is detachably attached to the vehicle body member via a lock mechanism only at the center in the width direction, and a buckle of a three-point support type seat belt supported by the vehicle body member at three points includes the lock mechanism. 4. The vehicle seat belt mounting structure according to claim 3, wherein the vehicle seat belt mounting structure is attached to the latch.   5. The vehicle seat belt mounting structure according to claim 3, wherein the striker is mounted across the bracket and a rear cross member in front of the bracket. While the front end of the bracket is attached to the rear cross member, the bracket includes a first and second attachment seats formed in a hat-shaped cross-sectional side view, and the first attachment seat extends in the vehicle width direction and extends in the vehicle width direction. The second mounting seat is mounted on the bottom wall of the rear cross member in a state of forming a closed cross section with the rear cross member, and the striker straddles both the first and second mounting seats. 6. The vehicle seat belt mounting structure according to claim 5, wherein the vehicle seat belt mounting structure is mounted.

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