JP3146811B2 - Vehicle seat mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat mounting structure for securely supporting a vehicle seat.

[0002]

2. Description of the Related Art There are various structures of a mounting portion of a vehicle seat, and the structure of a mounting portion of a front seat 100 will be disclosed below.
The description will be made with reference to Japanese Patent Publication No. 268 as an example.

As shown in FIG. 6, in the structure disclosed in this publication, a pair of cross members 104 and 106 each having a hat-shaped cross section are fixed to the upper surface of a floor panel 102. These cross members 104, 106
Are spaced apart from each other with the longitudinal direction of the vehicle width direction. Then, these cross members 104, 1
A front seat 100 is attached to the seat 06. Specifically, seat brackets 110 and 112 provided at the front and rear ends on the bottom side of the seat track 108 that slidably support the front seat 100 are attached to the cross members 10.
4 and 106, and the bolt 114 is screwed into the weld nut 116 in this state.

In the structure disclosed in this publication, the surface rigidity of the floor panel 102 is improved by arranging a pair of cross members 104 and 106, thereby improving the support strength of the front seat 100 to some extent. The effect that can be obtained is obtained.

Here, the front seat 100 is slid in the seat front-rear direction along the seat track 108, and the front seat 100 is slid in the seat front-rear direction while the occupant is seated.
Therefore, it is important how to support the load acting in the front-rear direction of the seat.

However, in the structure disclosed in the above publication, the load in the longitudinal direction of the seat must be supported and transmitted to the floor panel 102 by only the pair of cross members 104 and 106 having the longitudinal direction in the vehicle body width direction. In order to sufficiently support the load, the cross member 1 is required.
It is necessary to take measures such as increasing the thickness of the plates 04 and 106. For this reason, there was a problem that the weight was increased.

The above description is established when the structure disclosed in the above-mentioned publication is viewed as the mounting structure of the front seat. However, the above-mentioned publication discloses the mounting structure of the rear seat, particularly, the folding rear seat. When looking at the structure, the same problem as described above occurs from a different viewpoint.

That is, in such a foldable rear seat, a front end portion serving as a hinge when tilting is connected to a mounting bracket welded to the rear floor pan, but a rear end portion is not connected to the rear floor pan. Often. Therefore, in this type of the foldable rear seat, a load acts particularly on the front end thereof, and it is important how the load is supported. As can be seen from the above, when the structure disclosed in the above-mentioned publication is adopted as a mounting portion structure of this kind of the foldable rear seat, it is necessary to further take measures such as increasing the thickness of the cross member 104. become.

In view of the above, it is an object of the present invention to provide a vehicle seat mounting structure capable of securely supporting a vehicle seat without taking measures such as increasing the thickness of a cross member. It is.

[0010]

According to the first aspect of the present invention, there is provided a vehicle seat mounting structure according to the present invention, which is disposed below a vehicle body floor in a longitudinal direction of a vehicle body and is fixed to a lower surface of the vehicle body floor. A first cross member forming a first closed cross section with the vehicle body floor, a second cross member forming a second closed cross section with the vehicle body floor, and a vehicle body front-rear direction being a longitudinal direction above the vehicle body floor. is fixed to the upper surface of the vehicle body floor while being arranged, is connected the rear seat for a vehicle and a plurality of support brackets for supporting the rear seat the vehicle, further, the support bracket, the front end portion in plan view Are superimposed on the first closed cross section and the rear end is superimposed on the second closed cross section.
And the rear end are welded to the vehicle body floor at three points.
It is characterized in that a closed section is formed with the floor .

[0011]

According to the first aspect of the present invention, the first cross member and the second cross member are spaced apart from each other in the front-rear direction of the vehicle body below the vehicle body floor, and are disposed on the lower surface of the vehicle body floor. Fixed. Thereby, the vehicle body floor and the first
A first closed cross-section is formed by the cross member, and a second closed cross-section is formed by the vehicle body floor and the second cross member. By forming the first closed section and the second closed section, the support strength of the vehicle seat against a load acting in the width direction of the vehicle body with reference to the vehicle body floor is improved. .

[0012] Not only, in the present invention, a plurality of support brackets rear Sea <br/> preparative vehicle is connected for supporting a rear seat for that vehicle, the vehicle body longitudinal direction on the upper side of the vehicle floor as the longitudinal direction It is arranged and fixed to the upper surface of the vehicle body floor. Furthermore, in the present invention, the front end and the rear end of the plurality of support members are superimposed on the first closed section and the second closed section in plan view. support strength of the rear seat for a vehicle with respect to load acting in the longitudinal direction is enhanced. That is, between the first cross member and the second cross member, the first closed section and the second closed section formed by these and the vehicle body floor are not overlapped in plan view. just because the longitudinal direction of the vehicle body to place a plurality of support brackets to the longitudinal direction, but the support strength of the rear sheet <br/> over preparative vehicle against loads acting in the longitudinal direction of the vehicle body is improved to some extent, in the present invention ,
By overlapping the front end and the rear end of the plurality of support brackets with the first closed cross-section and the second closed cross-section in plan view,
Li vehicle with respect to the load acting on the more front-rear direction of the vehicle body
Thereby improving the support strength of ya seat.

Therefore, according to the present invention, the vehicle for the load acting on the vehicle body in the front-rear direction with respect to the vehicle body floor is viewed.
Any of the support strength of the rear seat for a vehicle with respect to the load acting on the supporting strength and the vehicle body width direction of the rear seat, sufficient strength can be obtained. Therefore, the first cross member, the second
It is not necessary to increase the thickness of the cross member. further,
According to the present invention , since the above-described support bracket forms a closed cross-section with the vehicle body floor, the load acting in the vehicle front-rear direction as compared to the support bracket structure that forms an open cross-section in relation to the vehicle body floor support strength of the rear vehicle seat is improved with respect. In addition , according to the present invention , since the above-described support bracket is welded to the vehicle body floor at least at three points of the front end, the middle part, and the rear end, the strength of the connection of the support bracket to the vehicle body floor is increased. Can be. Furthermore, since the surface rigidity of the vehicle body floor itself is also increased, NVH, riding comfort, and the like can be significantly improved.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In these drawings, an arrow FR appropriately shown indicates an upper side of the vehicle, an arrow UP indicates an upper side of the vehicle, and an arrow IN indicates an inner side of the vehicle.

FIG. 1 shows a rear structure of a vehicle body floor. On both sides of the vehicle body, rear floor side members 10 whose longitudinal direction is the vehicle front-rear direction are respectively disposed. In this figure, a rear floor side member arranged on the left side of the vehicle body is not shown. These rear floor side members 10 have a rear floor pan 1
2 are fixed by spot welding on both sides in the vehicle width direction.

Further, the front end of the rear floor pan 12 protrudes upward in the vehicle body, and a center floor cross member 14 as a first cross member bent stepwise is provided on the back surface of the protrusion 12A. It is fixed by spot welding. In addition, both ends in the longitudinal direction of the center floor cross member 14 are connected to the rear floor side members 10 described above.
Are fixed by spot welding. Also,
The front end of the center floor cross member 14 is fixed to a floor panel (not shown). As a result, the projections 12 of the center floor cross member 14 and the rear floor pan 12 are formed.
A forms a closed section 16 as a first closed section.

The center floor cross member 14
The rear side of the vehicle body is parallel to the center floor cross member 14 and is separated by a predetermined distance to form a second hat-shaped section.
A rear floor cross member 18 as a cross member is disposed. Both ends of the rear floor cross member 18 are fixed to the back surface of the rear floor pan 12 by spot welding. Note that, similarly to the center floor cross member 14, both longitudinal end portions of the rear floor cross member 18 are fixed to the rear floor side members 10 by spot welding. As a result, the rear floor cross member 18 and the rear floor pan 12 form a closed section 20 as a second closed section.

On the upper surface of the rear floor pan 12 described above,
A pair of rear seat mounting brackets 22 as support brackets are arranged so that the longitudinal direction is the vehicle front-rear direction so as to bridge the center floor cross member 14 and the rear floor cross member 18. Specifically, the front ends of the pair of rear seat mounting brackets 22 are fixed to the projections 12A of the rear floor pan 12 by spot welding. The rear ends of the pair of rear seat mounting brackets 22 are fixed by spot welding to the surface of the rear floor pan 12 opposite to the rear floor cross member 18. Accordingly, when this state is viewed in a plan view, the front ends of the pair of rear seat mounting brackets 22 overlap with the center floor cross member 14 and the rear ends of the pair of rear seat mounting brackets 22 form the rear floor cross member 18.
(Also shown in FIG. 2).

The shape of the rear seat mounting bracket 22 will be described. The rear seat mounting bracket 22 is formed by stamping a sheet metal into a predetermined shape.
2A is bulged toward the upper side of the vehicle body with respect to the peripheral flange portion 22B. Further, a mounting portion 22C having a triangular shape in a side view is formed to protrude forward of the central portion 22A of the rear seat mounting bracket 22. A bolt insertion hole is formed at the center of the mounting portion 22C, and a weld nut 24 is provided on the back side thereof (see FIGS. 2 and 3).
Is welded.

Next, referring to FIGS. 4 and 5, the structure of a retractable rear seat 26 as a vehicle seat mounted on the pair of rear seat mounting brackets 22 will be described. As shown in these figures, the rear seat 26 includes a rear seat cushion 28 and a rear seat back 30 that is disposed in an upright state at the rear end of the rear seat cushion 28. The rear end of the rear seat cushion 28 and the lower end of the rear seat back 30 are connected by a pair of arms 32. The rear seat back 30 is connected and supported by a pair of arms 32 via a seat back hinge 34. Accordingly, the rear seat back 30 can be tilted toward the rear seat cushion 28 about the seat back hinge 34 (FIG. 5).
reference).

A seat cushion rear bracket 36 is provided on the rear surface of the rear end of the rear seat cushion 28. This seat cushion rear bracket 36
Is mounted on the upper surface of the rear end of the rear seat mounting bracket 22 in a state where the rear seat cushion 28 cannot be tilted by a lock mechanism (not shown). But,
The seat cushion rear bracket 36 is not connected to the rear seat mounting bracket 22. Therefore, when the lock mechanism (not shown) is released, the seat cushion rear bracket 36 can be separated from the rear seat mounting bracket 22.

Further, on the rear surface of the front end of the rear seat cushion 28, a seat cushion front bracket 38 is provided. This seat cushion front bracket 3
8 is a support portion 38A fixed to the lower front end of the rear seat cushion 28 and supporting the rear seat cushion 28;
Mounting portion 22C of rear seat mounting bracket 22 described above
A plate-shaped fixing portion 38B fixed to the weld nut 24 with a bolt (not shown), and a hinge pin 38C connecting the supporting portion 38A and the fixing portion 38B. Therefore, the rear seat cushion 28 can be tilted forward with respect to the vehicle body around the hinge pin 38C (FIG. 5).
reference). The connection structure between the front end of the rear seat cushion 28 and the rear seat mounting bracket 22 is not limited to this, and various hinge structures can be applied.

The operation of this embodiment will be described below. FIG.
Is a normal use state of the rear seat 26. When the vehicle travels while the rear seat 26 is in use, the loads in the vehicle width direction and the vehicle front-rear direction are transmitted from the rear seat 26 to the vehicle body floor side.

In this embodiment, as shown in FIG. 1, as a rear structure of the vehicle body floor at a mounting position of the rear seat 26, a center floor cross member 14 and a rear floor cross member 18 having a longitudinal direction in the vehicle width direction are provided. And a closed section 16 with the rear floor pan 12 respectively.
Since the support member 20 is formed, the support strength against the load in the vehicle body width direction is improved. Therefore, the load in the vehicle width direction transmitted from the rear seat 26 is reliably supported.

Further, in the present embodiment, a pair of rear seat mounting brackets 22 having a longitudinal direction in the vehicle body longitudinal direction are arranged so as to bridge the center floor cross member 14 and the rear floor cross member 18, and Since the front end of the rear seat mounting bracket 22 is overlapped with the front closed section 16 and the rear end of the rear seat mounting bracket 22 is overlapped with the rear closed section 20 in a plan view, it is possible to support the load in the vehicle longitudinal direction. Strength is improved. In other words, a part of the load in the longitudinal direction of the vehicle body can be assigned to the closed cross-section portions 16 and 20 extending in the width direction of the vehicle body. Therefore, the load in the vehicle longitudinal direction transmitted from the rear seat 26 is reliably supported.

On the other hand, when the rear seat 26 is tilted from this state, the state shown in FIG. 5 is obtained. That is, the rear seat back 30 is tilted toward the rear seat cushion 28 with the seat back hinge 34 as a center, and in this state, the rear seat back 30 is tilted integrally with the hinge pin 38C as a center toward the vehicle body front side. Therefore, the rear seat 26
In the tilted state, the load described above is input to the front end side of the rear seat mounting bracket 22 in particular.

However, even in such a state, the pair of rear seat mounting brackets 22 are viewed in plan at the closed cross-sections 16 and 20 formed by the center floor cross member 14, the rear floor cross member 18 and the rear floor pan 12 described above. By being connected in a superimposed state, it is possible to sufficiently support a load in the vehicle body width direction and a load in the vehicle front-rear direction.

As described above, in the present embodiment, the center floor cross member 14 and the rear floor cross member 18 having the longitudinal direction in the vehicle body width direction are disposed on the back surface of the rear floor pan 12 so as to be separated from each other. Since the pair of rear seat mounting brackets 22 whose longitudinal direction is the longitudinal direction of the vehicle body is connected to these closed cross-sections 16 and 20 so that they are superposed in plan view, the center floor cross member 14 is formed. , Rear floor cross member 18
Without increasing the thickness of the plate or increasing the number of bolt tightening points, the load transmitted from the rear seat 26 in the vehicle width direction and the vehicle front-rear direction can be reliably supported.

Therefore, the rear seat 26 does not suffer from unevenness, and it is possible to improve the NVH and improve the ride comfort of the occupant. In addition, by adopting the above configuration, the surface rigidity of the rear floor pan 12 is also improved, so that there is an effect that vibration of the vehicle body floor itself is reduced.

In the present embodiment, the present invention is applied to the foldable rear seat 26. However, the present invention is not limited to this.
The present invention may be applied to a fixed rear seat .
No.

In this embodiment, a pair of rear seat mounting brackets 22 is used. However, the present invention is not limited to this, and three or more rear seat mounting brackets 22 may be used.

[0032]

[0033]

As described above, the vehicle seat mounting structure according to the first aspect of the present invention is disposed below the vehicle body floor in the front-rear direction of the vehicle body and is separated from the lower surface of the vehicle body floor. A first cross member that forms a first closed cross section with the vehicle body floor, and a second cross member that forms a second closed cross section with the vehicle body floor; is fixed to the upper surface of the vehicle body floor while being arranged as being connected the rear seat for a vehicle and a plurality of support brackets for supporting the rear seat the vehicle, further, the support bracket, the front end portion in plan view Are superimposed on the first closed cross section and the rear end is superimposed on the second closed cross section.
And the rear end are welded to the vehicle body floor at three points.
Since forming the closed cross-section portion at the floor, take measures without such increasing the plate thickness of the cross member, Li vehicle
It has an excellent effect that it is possible to securely support the Ya sheet.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a vehicle seat mounting portion structure according to the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a sectional view taken along line 3-3 of FIG. 1;

FIG. 4 is a side view showing the rear seat in a normal use state.

FIG. 5 is a side view showing a state where the rear seat is tilted from the state shown in FIG. 4;

FIG. 6 is a side view showing a conventional example.

[Explanation of symbols]

12 Rear floor pan (body floor) 14 Center floor cross member (first cross member) 16 Closed section (first closed section) 18 Rear floor cross member (second cross member) 20 Closed section (second closed-section portion) 22 rear seat mounting brackets (support bracket) 26 rear seat (rear seat for a vehicle)

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B62D 25/20

Claims (1)

(57) [Claims] A first closed section formed below the vehicle body floor and spaced apart in a longitudinal direction of the vehicle body and fixed to a lower surface of the vehicle body floor to form a first closed section with the vehicle body floor;
A cross member and a second cross member forming a second closed cross section are disposed above the vehicle body floor with the longitudinal direction of the vehicle body as a longitudinal direction and fixed to the upper surface of the vehicle body floor,
Rear seat is connected and a plurality of support brackets for supporting the rear seat the vehicle, further, the support bracket, the front end portion in plan view the first
At least the front end, the middle, and the rear end in a state where the rear end is superposed on the second closed cross section and the rear end is superposed on the second closed cross section.
Welded to the car body floor at three places and closed with the car body floor
A vehicle seat mounting structure, wherein a cross-section is formed .