JP3636043B2 - Seat mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mounting structure for a seat mounting portion of an automobile or the like.
[0002]
[Prior art]
As conventional seat mounting structure for automobiles, in order to ensure seat mounting strength, the seat mount bracket has been made thicker or a separate rain force has been set for the seat mount bracket placement area. It has been.
[0003]
Further, in order to improve sound vibration performance and steering stability separately from the above-mentioned reinforcement, a tunnel stay is also provided on the lower surface of the rear seat cross member arranged in the vehicle width direction behind the seat mount bracket in the vehicle lower portion. (See JP-A-10-203424).
[0004]
[Problems to be solved by the invention]
However, if the thickness of the left and right seat mount brackets is increased in order to ensure the seat mounting strength as in the conventional structure, or if a separate reinforcement is set on the seat mount bracket placement portion, the weight will increase. It was undeniable that the cost would become disadvantageous as it increased.
[0005]
Further, in order to improve sound vibration performance and steering stability separately from the above-mentioned reinforcement, a tunnel stay is provided on the lower surface of the rear seat cross member disposed in the vehicle width direction behind the seat mount bracket. such as setting the mounting brackets for the tunnel stay separately, weight increase and cost increase, there are problems such as further assembly steps is increased.
[0006]
In particular, since the weight problem affects the fuel consumption and running performance of the vehicle, there is a high demand for reducing the weight of the entire vehicle as much as possible, and it is desired to achieve both improved vehicle body rigidity and light weight.
[0007]
Accordingly, the present invention provides a seat mounting portion structure that can improve the seat mounting rigidity and the rigidity of the lower part of the vehicle body while preventing an increase in weight due to an increase in parts.
[0008]
[Means for Solving the Problems]
In the invention of claim 1, a seat tunnel structure for a vehicle body in which a floor tunnel extending in the longitudinal direction of the vehicle body is formed at a substantially central portion of the floor panel, and seats are provided on the left and right sides of the floor tunnel. The seat mount bracket for attaching the seat to the vehicle body is attached to the left and right side walls of the floor tunnel, and the rear portion extends toward the rear of the vehicle, and is provided below the floor tunnel along the vehicle width direction. The both ends of the tunnel stay are attached to the lower surfaces of the rear portions of the left and right seat mount brackets from below, and the seat mount bracket receives a load from a seat belt provided on the seat side at the time of a rear-end collision of a vehicle. The tunnel stay that attaches the seat mount bracket and the tunnel stay behind the seat attachment point The dotted, is characterized in that set in the seat belt load acting line.
[0009]
According to a second aspect of the present invention, there is provided the seat mounting portion structure according to the first aspect, wherein the seat mount bracket includes a pair of side wall portions that are attached to left and right side walls of the floor tunnel, and an upper wall of the floor tunnel. The upper wall portion connecting the left and right side wall portions is formed into a substantially hat-shaped cross section, and attached to the inside of the floor tunnel along the upper wall and the left and right side walls of the floor tunnel from the lower side. It is said.
[0012]
The invention according to claim 3 is the seat mounting portion structure according to claim 2 , wherein the front end portion of the upper wall of the seat mount bracket is from the seat belt load acting line with respect to the seat mounting point. Is also characterized by extending to the front part of the vehicle.
[0013]
The invention according to claim 4 is the seat mounting portion structure according to any one of claims 1 to 3 , wherein the tunnel stay is predetermined at a vehicle rear position of a muffler disposed in the floor tunnel. And is arranged so as to overlap the muffler when viewed from the front-rear direction.
[0014]
【The invention's effect】
According to the first aspect of the present invention, the seat mount bracket for attaching the seat to the vehicle body is attached to the left and right side walls of the floor tunnel, the rear portion is extended toward the rear of the vehicle, and the vehicle is located below the floor tunnel. Since both ends of the tunnel stay provided along the width direction are attached from the lower side across the lower surface of the rear part of the left and right seat mount brackets, the tunnel stay ensures the rigidity of the lower part of the vehicle body, and the sound vibration performance In addition, the steering stability can be improved and the mounting strength of the seat can be ensured.
[0015]
In addition, it is not necessary to increase the thickness of the seat mount bracket as in the past, and because the rain force that has been set separately for the seat mount bracket can be eliminated, the seat mounting strength and the vehicle body The increase in weight can be suppressed while securing the rigidity of the lower part.
[0016]
Further, the reduction in the number of parts can reduce the work man-hours, which can be advantageously obtained in terms of cost.
Also, the tunnel stay attachment point is set on the seat belt load acting line behind the seat attachment point where the load is input from the seat belt provided on the seat side at the time of a rear-end collision of the vehicle. The moment acting on the seat attachment point and the tunnel stay attachment point can be minimized, and the opening deformation of the floor tunnel due to the input load from the seat belt can be effectively suppressed by the tunnel stay.
In addition, it is possible to avoid interference between the muffler generally disposed at the front position of the seat mount bracket of the floor tunnel and the tunnel stay, and the layout flexibility of the muffler can be improved.
[0017]
According to the second aspect of the present invention, in addition to the effect of the first aspect, the seat mount bracket includes a pair of side wall portions attached to the left and right side walls of the floor tunnel, and the upper wall of the floor tunnel. The seat mount bracket is formed in a substantially hat-shaped cross section composed of an upper wall portion that connects the left and right side wall portions, and is attached to the inside of the floor tunnel along the upper wall and the left and right side walls of the floor tunnel from the lower side. With the tunnel stay, a closed cross section can be formed, and further, the mounting strength of the seat and the rigidity of the lower part of the vehicle body can be improved.
[0021]
According to the third aspect of the present invention, in addition to the effect of the second aspect , the front end portion of the upper wall of the seat mount bracket is positioned on the front side of the vehicle with respect to the seat attachment point with respect to the seat belt load acting line. This is advantageous for the moment that acts on the seat mounting point and the front end of the upper wall of the seat mount bracket due to the load on the seat mount bracket obliquely above and below the front of the vehicle, such as during a frontal collision of the vehicle. Can be obtained.
[0022]
In addition, in the seat mount bracket having a substantially hat-shaped cross section according to claim 2, a closed cross section can be formed on the seat belt load acting line by the seat mount bracket and the tunnel stay. The seat mounting strength and the rigidity of the lower part of the vehicle body can be improved.
[0023]
According to the fourth aspect of the present invention, in addition to the effect of any one of the first to third aspects, the tunnel stay is spaced a predetermined distance from the vehicle rear position of the muffler disposed in the floor tunnel. In addition, since the muffler is arranged so as to overlap with the muffler when viewed from the front-rear direction, the muffler layout is increased in freedom, and interference between the tunnel stay 4 and the muffler 9 is prevented in a normal state. Sometimes the muffler's rearward movement can be suppressed by the tunnel stay. [0024]
Thereby, since this muffler can be utilized as an energy absorbing member, the frontal collision performance of the vehicle can be reasonably ensured.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
[0026]
1 to 4 show a seat mounting portion structure of an automobile to which the present invention is applied.
[0027]
Reference numeral 1 denotes a floor panel, and a floor tunnel 2 extending in the longitudinal direction of the vehicle body is formed at a substantially central portion of the floor panel 1. Sheets (not shown) are provided on the left and right sides of the floor tunnel 2 .
[0028]
Reference numeral 3 denotes a seat mount bracket for attaching the seat to the vehicle body. The seat mount bracket 3 has side walls 3A and 3B attached to the left and right side walls 2A and 2B of the floor tunnel 2, and its rear portion is directed rearward of the vehicle as compared with the prior art. It is extended.
[0029]
Particularly in this embodiment, the seat mount bracket 3 includes a pair of left and right side wall portions 3A and 3B, and an upper wall portion 3C connecting the left and right side wall portions 3A and 3B along the upper wall 2C of the floor tunnel 2. The cross section is formed in a substantially hat shape, and is attached to the inside of the floor tunnel 2 along the upper wall 2C and the left and right side walls 2A, 2B of the floor tunnel 2 from below.
[0030]
4 is a tunnel stay provided below the floor tunnel 2 along the vehicle width direction. Both ends of the tunnel stay 4 are bolt nuts 5 from the lower side across the left and right lower surfaces of the rear portion of the seat mount bracket 3. , 6.
[0031]
A tunnel stay attachment point 7 for attaching the seat mount bracket 3 and the tunnel stay 4 is set behind the vehicle with respect to a seat attachment point 8 for attaching the seat of the seat mount bracket 3.
[0032]
In particular, the tunnel stay attachment point 7 is connected to the seat belt load acting line L with respect to the seat attachment point 8 to which a load is input from a seat belt (not shown) provided on the seat side at the time of rear-end collision of the vehicle. It is set above.
[0033]
On the other hand, the front end portion of the upper wall 3C of the seat mount bracket 3 is provided so as to extend to the front portion of the vehicle with respect to the seat attachment point 8 from the seat belt load acting line L.
[0034]
Reference numeral 9 denotes an exhaust system muffler, and an exhaust tube 10 extending rearward of the vehicle is connected to a rear end portion of the muffler 9.
[0035]
The tunnel stay 4 is disposed so as to be spaced from the vehicle rear position of the muffler 9 disposed in the floor tunnel 2 and overlap the muffler 9 when viewed from the front-rear direction.
[0036]
In addition, embossed portions 12 to 15 are set in the vehicle width direction in the vicinity of the front and rear edge portions of the seat mount bracket 3 and the bolt holes 11 and 11 for attaching the seat, and the front and rear of the tunnel stay 4. Steps 16 and 17 are formed at the edges to increase the rigidity of the seat mount bracket 3 and the tunnel stay 4 itself.
[0037]
Further, the embossed portions 18 to 21 are formed also at the position where the seat mount bracket 3 is disposed on the floor panel 1 so as to increase the rigidity of the vehicle body at the position.
[0038]
According to the structure of the above embodiment, the seat mount bracket 3 is attached to the left and right side walls 2A, 2B of the floor tunnel 2, and the rear part is extended toward the rear of the vehicle. Since both end portions of the tunnel stay 4 provided along the width direction are attached from the lower side across the left and right lower surfaces of the rear portion of the seat mount bracket 3, the tunnel stay 4 ensures the rigidity of the lower portion of the vehicle body, The sound vibration performance and steering stability can be improved, and the mounting strength of the seat can be ensured.
[0039]
In addition, according to this structure, it is not necessary to increase the thickness of the seat mount bracket 3 as in the prior art, and it is possible to eliminate the reinforcement that has been separately set in the arrangement portion of the seat mount bracket 3 conventionally. The increase in weight can be suppressed while securing the mounting strength of the seat and the rigidity of the lower part of the vehicle body.
[0040]
Further, the reduction in the number of parts can reduce the work man-hours, which can be advantageously obtained in terms of cost.
[0041]
In particular, according to the structure of the present embodiment, in addition to the above effects, the seat mount bracket 3 includes a pair of side wall portions 3A and 3B and an upper wall portion 3C connecting the left and right side wall portions 3A and 3B. Since the cross section is formed into a substantially hat shape and is attached to the inside of the floor tunnel 2 from the lower side, a closed cross section S can be formed by the seat mount bracket 3 and the tunnel stay 4. The rigidity of the lower part can be improved.
[0042]
In addition, since the tunnel stay attachment point 7 is set behind the vehicle relative to the seat attachment point 8, due to a load obliquely above and ahead of the vehicle applied to the seat mount bracket 4 during a frontal collision of the vehicle, etc. A structure advantageous to the moment acting on the seat attachment point 8 and the tunnel stay attachment point 4 can be obtained.
[0043]
In addition, interference between the muffler 9 disposed at the front position of the seat mount bracket 3 of the floor tunnel 2 and the tunnel stay 4 can be avoided, and the degree of freedom of layout of the muffler 9 can be improved.
[0044]
Further, since the tunnel stay attachment point 7 is set on the seat belt load acting line L with respect to the seat attachment point 8, the moment acting on the seat attachment point 8 and the tunnel stay attachment point 7 is minimized. it is possible to suppress, can be effectively suppressed by the tunnel stay 4 open deformation Furoaton'ne Le 2 by the input load from an unillustrated seat belt.
[0045]
Further, since the front end portion of the upper wall 3C of the seat mount bracket 3 is extended to the front portion of the vehicle with respect to the seat attachment point 8 with respect to the seat belt load acting line L, the vehicle is subjected to a frontal collision or the like. As described above, a structure advantageous to the moment acting on the seat attachment point 8 and the front end portion of the upper wall 3C of the seat mount bracket 3 can be obtained.
[0046]
Moreover, since the seat mount bracket 3 has a substantially hat-shaped cross section, the seat mount bracket 3 and the tunnel stay 4 can form a closed cross section on the seat belt load acting line L. The mounting strength and the rigidity of the lower part of the vehicle body can be improved.
[0047]
In addition, the tunnel stay 4 is disposed at a predetermined distance behind the muffler 9 disposed in the floor tunnel 2 so as to overlap the muffler 9 when viewed from the front-rear direction. Therefore, the freedom of layout of the muffler 9 can be increased, the interference between the tunnel stay 4 and the muffler 9 can be prevented during normal times, and the rearward movement of the muffler 9 can be suppressed by the tunnel stay 4 when the vehicle collides.
[0048]
Thereby, since this muffler 9 can be utilized as an energy absorbing member, the frontal collision performance of the vehicle can be reasonably ensured.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a main part of an embodiment of the present invention.
FIG. 2 is a top view of the same embodiment.
FIG. 3 is a side view of the same embodiment.
4 is a cross-sectional view taken along line AA in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Floor panel 2 Floor tunnel 2A, 2B Side wall 2C Upper wall 3 Seat mount bracket 3A, 3B Side wall part 3C Upper wall part 4 Tunnel stay 7 Tunnel stay attachment point 8 Seat attachment point 9 Muffler

Claims (4)

A floor tunnel extending in the longitudinal direction of the vehicle body is formed in a substantially central portion of the floor panel, and a seat mounting portion structure for a vehicle body in which seats are provided on the left and right sides of the floor tunnel,
The seat mount bracket for attaching the seat to the vehicle body is attached to the left and right side walls of the floor tunnel, and the rear portion extends toward the rear of the vehicle,
The both ends of the tunnel stay provided along the vehicle width direction below the floor tunnel are attached from the lower side across the lower surfaces of the rear portions of the left and right seat mount brackets, and are provided on the seat side during a rear-end collision of the vehicle. The tunnel stay attachment point for attaching the seat mount bracket and the tunnel stay is set on the seat belt load acting line behind the seat attachment point of the seat mount bracket where the load is input from the seat belt. The seat mounting part structure.   The seat mount bracket is formed in a substantially hat-shaped cross section including a pair of side wall portions attached to the left and right side walls of the floor tunnel, and an upper wall portion connecting the left and right side wall portions along the upper wall of the floor tunnel. The seat mounting portion structure according to claim 1, wherein the seat mounting portion structure is attached to the inside of the floor tunnel along the upper wall and the left and right side walls of the floor tunnel from the lower side. The seat mounting portion structure according to claim 2 , wherein a front end portion of an upper wall of the seat mount bracket is extended to a front portion of the vehicle with respect to the seat mounting point with respect to the seat belt load acting line. 2. The tunnel stay is disposed at a vehicle rear position of a muffler disposed in the floor tunnel so as to overlap the muffler when viewed from the front-rear direction. The seat mounting part structure according to any one of to 3 .

Images