JP4151827B2 - Vehicle seat - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a lower frame provided on a floor side and provided with a seat cushion, an upper frame provided rotatably on the lower frame and provided with a seat back, and a reclining that prohibits / permits rotation of the upper frame. The present invention relates to a vehicle seat having a mechanism.
[0002]
[Prior art]
The vehicle seat will be described with reference to FIG. In the figure, the lower frame 3 on which the seat cushion 11 is provided is provided on the floor F side. The lower frame 3 is provided with an upper frame 7 that is rotatable about a hinge pin 5. The upper frame 7 is provided with a seat back 13. A reclining mechanism 9 that prohibits / permits rotation of the upper frame 7 is provided between the lower frame 3 and the upper frame 7.
[0003]
[Problems to be solved by the invention]
In such a vehicle seat, when a passenger is seated on the vehicle seat and is collided with another vehicle or the like from the rear of the vehicle (hereinafter referred to as a rear collision), the impact is received by the seat back 13. At this time, an impact in the direction of arrow W in FIG. 6 is applied to the seat back 12, and a bending moment in the direction of arrow BM acts on the lower frame 3.
[0004]
When the impact is large, the lower frame 3 is deformed to absorb the energy of the impact.
However, in the vehicle seat having the above-described configuration, the lower frame 3 is set so as to have substantially the same strength throughout, and therefore, the location and direction of deformation of the lower frame are not constant at the time of rearward collision of the vehicle. There is a point.
[0005]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicle seat in which the location and direction of deformation of the lower frame are constant at the time of rearward collision of the vehicle.
[0006]
[Means for Solving the Problems]
The invention according to claim 1, which solves the above problem, is provided on the floor side and provided with a seat cushion, an upper frame provided rotatably on the lower frame and provided with a seat back, and the lower frame. And a reclining mechanism that is attached to the upper frame and prohibits / permits rotation of the upper frame, in a lower peripheral portion of the lower frame below the attachment portion of the reclining mechanism, outside of the lower frame, possess an offset portion bent formed so as to protrude to either inside of, and a flange portion bent for reinforcement substantially formed over the entire circumference of the peripheral edge of the lower frame, the The shape of the bending offset portion is such that the peripheral side of the lower frame is the bottom surface side, A bending angle of the bent flange portion with respect to the lower frame side surface at a substantial center of the bending offset portion at least a part of the substantially triangular pyramid having a line is a bend with respect to the lower frame side surface of the bent flange portion at another portion A vehicle seat characterized in that it is smaller than a corner .
[0007]
By having a folding offset portion formed so as to protrude to either the outer side or the inner side of the lower frame at the peripheral portion below the attachment portion of the reclining mechanism in the lower frame, the folding offset portion is It becomes a weak part with weaker strength than other parts.
[0008]
Therefore, at the time of rearward collision of the vehicle, the bending offset portion is always deformed first, and the location and direction of deformation of the lower frame are constant. Further, the bending offset portion is formed below the reclining mechanism, so that it is deformed in the direction of being crushed at the time of rearward collision of the vehicle, and finally both ends in the width direction of the bending offset portion are in contact with each other. Deformation is prohibited. That is, excessive deformation of the lower frame can be prevented.
[0009]
Furthermore, the lower frame can be made thinner by having a reinforcing bent flange portion formed over substantially the entire periphery of the lower frame.
The number of bending offset portions is not limited, but one is preferable from the viewpoint of ease of processing.
[0010]
Furthermore, from the viewpoint of ensuring the overall strength of the lower frame, it is preferable to form a bent flange portion at a location where the bent offset portion is formed.
According to a second aspect of the present invention, the shape of the bent offset portion is at least a part of a substantially triangular pyramid having three bent lines, with the peripheral side of the lower frame being a bottom surface side. The vehicle seat according to claim 1.
[0011]
The bending offset part has a bottom side on the periphery side of the lower frame, and a part of a substantially triangular pyramid having three folding lines so that the lower frame can be moved due to deformation of the lower frame. Is a rotation about the apex of the substantially triangular pyramid, and the deformation direction of the lower frame is constant.
[0012]
In addition, since the shape of the bending offset portion is at least part of a substantially triangular pyramid composed of three folding lines, the deformation is surely started from the three folding lines, so that the deformation state can be accurately controlled. .
[0014]
The bending angle of the bending flange portion at the approximate center of the bending offset portion is made smaller than the bending angle at the bending flange portion of the other portion, so that the middle folding of the three folding lines is performed. The wire is the weakest. Therefore, the direction of deformation of the lower frame is further constant.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. The difference between the present embodiment and the conventional example is a part of the lower frame, and the other parts are the same as those of the conventional example. Therefore, a different part from the conventional lower frame is demonstrated and description of another part is abbreviate | omitted.
[0016]
First, as shown in FIG. 1 which is a front view of the lower frame for explaining the inventive portion of the embodiment, the upper frame 103 is attached to the upper portion of the lower frame 101 via a reclining mechanism 102 (not shown).
[0017]
The reclining mechanism 102 includes a first member fixed to the lower frame 101 side, a second member rotatably attached to the first member and attached to the upper frame 103 side, and rotation of the second member. This is a normal mechanism composed of lock means to be prohibited / permitted, and detailed description thereof is omitted.
[0018]
Next, FIG. 2 is a cross-sectional view taken along a cutting line AA in FIG. 1, FIG. 3 is a cross-sectional view taken along a direction B in FIG. 1, and FIG. The invention portion of the present embodiment will be described with reference to FIG. 5 which is a cross-sectional view taken along the section line DD in FIG.
[0019]
A bent flange portion 111 is formed over substantially the entire periphery of the lower frame 101.
A bending offset portion 121 is formed at the peripheral edge of the lower frame 101 below the reclining mechanism 102. As shown in FIG. 3, the bending offset portion 121 is formed so as to protrude to the outside of the lower frame 101. Further, the folding offset portion 121 has a lower edge of the lower frame 101 as a bottom surface side, and a part of a substantially triangular pyramid having three folding lines, that is, a folding line 123, a folding line 125, and a folding line 127. It has become.
[0020]
Furthermore, the bending angle (angle θ in FIG. 5) at the bending flange portion 111 at substantially the center of the bending offset portion 121 is compared with the bending angle (angle θ ′ in FIG. 4) at the bending flange portion 111 of other portions. It set so that it might become small.
[0021]
According to such a configuration, the following effects can be obtained.
(1) By having the bending offset part 121 formed so as to protrude to the outside of the lower frame 101 at the peripheral part of the lower frame 101 below the reclining mechanism 102, the bending offset part 121 has a weakened weak part. Become.
[0022]
Therefore, at the time of rearward collision of the vehicle, the bending offset portion 121 is always deformed first, and the deformation location and deformation direction of the lower frame 101 are constant.
(2) The bending offset portion 121 is formed in the lower part of the reclining mechanism 102, so that it is deformed in the crushing direction at the time of rearward collision of the vehicle, and finally both ends in the width direction of the bending offset portion, that is, the folding line. When 123 and the folding line 127 come into contact with each other, a stopper that prohibits further deformation is provided. Therefore, excessive deformation of the lower frame 101 can be prevented.
(3) The lower frame 101 can be made thinner by having the reinforcing bent flange portion 111 formed over substantially the entire periphery of the lower frame 101.
(4) The shape of the bending offset portion 121 is such that the peripheral side of the lower frame 101 is the bottom surface side, and a part of a substantially triangular pyramid composed of three folding lines, that is, the folding line 123, the folding line 125, and the folding line 127. Therefore, the movement due to the deformation of the lower frame 101 at the time of the rear collision of the vehicle is a rotation about the apex of the substantially triangular pyramid (O: see FIG. 1), and the direction of the deformation of the lower frame 101 is further changed. It becomes constant.
(5) Since the shape of the folding offset portion 121 is at least a part of a substantially triangular pyramid composed of three folding lines, the folding offset section 121 must be separated from the three folding lines, that is, the folding line 123, the folding line 125, and the folding line 127. Since the deformation starts, the deformation state can be accurately controlled.
(6) The bending angle (angle θ in FIG. 5) at the bending flange portion 111 at the approximate center of the bending offset portion 121 is the bending angle (angle θ ′ in FIG. 4) at the bending flange portion 111 of the other portion. It was set to be smaller. For this reason, in this embodiment, the middle fold line 125 has the weakest strength among the three fold lines. Therefore, the direction of deformation of the lower frame 101 is further constant.
[0023]
The present invention is not limited to the above embodiment. In the above embodiment, the bending offset portion 121 is formed so as to protrude to the outside of the lower frame 101, but may be formed to protrude inward.
[0024]
【The invention's effect】
As described above , according to the first aspect of the present invention, the lower frame protrudes to the outer side or the inner side of the lower frame at the peripheral portion below the attachment portion of the reclining mechanism. By having the formed bending offset part, the bending offset part becomes a weak part with weaker strength than other parts.
[0025]
Therefore, at the time of rearward collision of the vehicle, the bending offset portion is always deformed first, and the location and direction of deformation of the lower frame are constant. Further, the bending offset portion is formed below the reclining mechanism, so that it is deformed in the direction of being crushed at the time of rearward collision of the vehicle, and finally both ends in the width direction of the bending offset portion are in contact with each other. Deformation is prohibited. That is, excessive deformation of the lower frame can be prevented.
[0026]
Furthermore, the lower frame can be made thinner by having a reinforcing bent flange portion formed over substantially the entire periphery of the lower frame .
In fold bent shape of the offset portion of the lower frame periphery side bottom side such Li, by which a part of a substantially triangular pyramid having three folding lines, in the vehicle rear-end collision, deformation of the lower frame The movement due to is a rotation about the apex of the substantially triangular pyramid, and the deformation direction of the lower frame is constant.
[0027]
In addition, since the shape of the bending offset portion is at least part of a substantially triangular pyramid composed of three folding lines, the deformation is surely started from the three folding lines, so that the deformation state can be accurately controlled. .
[0028]
The bending angle of the bent flange portion at substantially the center of the front Symbol bent offset portion, by which to be smaller than a bending angle at the bent flange portion of the other part, of the three folding lines, the middle The fold line is the weakest. Therefore, the direction of deformation of the lower frame is further constant.
[Brief description of the drawings]
FIG. 1 is a front view of a lower frame for explaining an inventive part of an embodiment.
FIG. 2 is a cross-sectional view taken along a cutting line AA in FIG.
FIG. 3 is a view taken in the direction of arrow B in FIG. 1;
4 is a cross-sectional view taken along a cutting line CC in FIG. 1. FIG.
5 is a cross-sectional view taken along a cutting line DD in FIG.
FIG. 6 is a configuration diagram illustrating a vehicle seat.
[Explanation of symbols]
101 Lower frame 102 Reclining mechanism 103 Upper frame 111 Bending flange portion 121 Bending offset portion

Claims (1)

A lower frame provided on the floor side and provided with a seat cushion;
An upper frame provided rotatably on the lower frame and provided with a seat back;
A reclining mechanism attached to the lower frame and the upper frame and prohibiting / permitting rotation of the upper frame;
In a vehicle seat having
A bending offset portion formed at the peripheral portion below the attachment portion of the reclining mechanism in the lower frame so as to protrude to either the outside or the inside of the lower frame;
Have a, a flange portion bent for reinforcement substantially formed over the entire circumference of the peripheral edge of the lower frame,
The shape of the bending offset portion is at least a part of a substantially triangular pyramid having three folding lines, with the peripheral side of the lower frame being the bottom surface side,
The folding angle of the bent flange portion with respect to the lower frame side surface at the approximate center of the bending offset portion is smaller than the bent angle with respect to the lower frame side surface of the bent flange portion in other portions. Vehicle seat.

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