WO2013047176A1 - Vehicle seat - Google Patents

Abstract

Provided is a vehicle seat that absorbs impact energy by means of bending deformation when the seat is subjected to impact energy from a rear-end collision, wherein the amount of seat deformation (angle of backward inclination) can be regulated. The following are provided: a fragile section (33a) that deforms when subjected to an impact load on at least the vehicle front side or the vehicle back side of a support bracket (33) that attaches a seating frame (2) to the floor of the vehicle and supports the load from the seating frame (2); and a regulation section (40), disposed so as to sandwich part of the fragile section (33a), that regulates the amount of deformation of the fragile section (33a).

Description

Vehicle seat

The present invention relates to a vehicle seat, and particularly to a vehicle seat that does not tilt too much backward when absorbing impact energy during a rear-end collision or the like.

In general, in the case of a so-called rear collision, such as when a rear part of a vehicle such as an automobile is collided or a large collision occurs during reverse travel, the seated occupant rapidly moves backward due to inertial force, and the upper body of the occupant Tilt backwards.

In general, the seat back of a vehicle seat has a structure in which a cushion material is placed on a metal seat back frame and covered with a skin material. However, when a rear collision occurs, the occupant rapidly moves backward as described above. Therefore, the amount of deformation of the seat back is not sufficient for this movement, and the load applied to the occupant's body may not be efficiently reduced. In addition, since a large load is applied to the seat back, the seat back may cause a problem.

In order to solve such a problem, in Patent Document 1, when a backward load is applied to the upper portion of the seat back frame, the side frame (described as “side member” in Patent Document 1) is bent. Techniques have been proposed for reducing the load applied to the occupant during rearward movement.

Japanese Patent No. 4200580

In the seat back frame disclosed in Patent Document 1, when a rearward load is applied along with the rearward movement of the occupant, such as during a rear-end collision, the side frame bends and the rearward impact energy is absorbed by the seatback frame. The However, since the seat back frame of Patent Document 1 cannot be deformed by limiting the deformation portion (bending portion) of the side frame, the seat back frame bends at any point along the vertical direction of the side frame. As a result, since the bending point cannot be limited, the impact energy is transmitted to the entire seat back frame, the impact energy absorption efficiency is lowered, and it is difficult to reduce the impact energy stably.

Therefore, the present applicant relates to a technology for absorbing impact energy by deforming a seat back frame, and when impact energy is applied, such as at the time of a rear collision, by forming a flexible constricted portion in the lower frame. A technique for bending the constricted portion preferentially and absorbing impact energy efficiently has been proposed (Japanese Patent Application No. 2010-273867, PCT / JP2011 / 078478). Thus, it becomes possible to absorb impact energy efficiently by limiting the deformation | transformation location of a seat back frame.

In the above technology, when the seat back frame is deformed to tilt backward, depending on the magnitude of impact energy applied, the angle of backward tilting becomes too large, and the seating posture of the occupant changes and the seating feeling is changed. There was a problem that it might be damaged.
Therefore, as described above, when an impact load is applied, the vehicle seat efficiently absorbs impact energy and regulates the deformation amount (deflection amount) of the vehicle seat itself. There has been a demand for a technique that can control the angle of backward inclination.

An object of the present invention is to regulate the amount of deformation (backward tilt angle) of a vehicle seat that absorbs impact energy by bending and deforming the seat when impact energy is applied at the time of collision, particularly at the time of rear-end collision. An object of the present invention is to provide a vehicle seat that can be used. Another object of the present invention is to reduce the influence on the seating posture of the occupant by controlling the amount of deformation of the seat when impact energy is applied in the event of a collision, particularly at the time of a rear collision. Is to provide.

According to the vehicle seat of the present invention, the problem is that an impact load is applied to at least one of the vehicle front side and the vehicle rear side of the support bracket that connects the seating frame to the vehicle floor and supports the load from the seating frame. It is solved by providing the weak part which deform | transforms when is added.

Thus, the vehicular seat includes a fragile portion that deforms when an impact load is applied, on the vehicle rear side of the support bracket that supports the load from the seating frame. By providing the fragile portion in this way, when an impact load is applied to the vehicle seat at the time of a rear collision or the like, a part of the vehicle seat (support bracket: so-called leg of the vehicle seat) starts from the fragile portion. Part) is deformed and can absorb impact energy.
Also, the support bracket bends due to the impact load toward the rear, and the upper part of the support bracket sinks toward the rear side (because a fragile part is provided on the rear side of the support bracket, the load is deflected from this part, The upper part of the seat frame sinks toward the rear side), the rear side of the seating frame also sinks to the rear side, and accordingly, the seat back frame also tilts backward.
Therefore, when an impact load is applied, the occupant's body can be efficiently left to the seat back frame.

At this time, as in claim 2, it is preferable that the support bracket is further provided with a restricting portion that is disposed at a position sandwiching a portion of the fragile portion and restricts the deformation amount of the fragile portion.
In other words, since the restricting portion facing the position where the fragile portion is sandwiched is formed so as to restrict the deformation amount of the fragile portion, when the fragile portion is deformed to a certain position (shape), the opposing restricting portion comes into contact. As a result, the fragile portion is pressed against further deformation. Therefore, the deformation amount of the fragile portion does not become larger than a certain value, and as a result, the deformation amount of the seat (support bracket) can be regulated (controlled) to be equal to or less than the certain value.
In addition, as described above, when an impact load is applied, the deformation amount of the seat (support bracket) is restricted so as not to become too large, so that the influence on the seating posture of the occupant is reduced.

According to a third aspect of the present invention, the restricting portion includes two opposing portions formed at positions where the weak portion is sandwiched, and a distance between the two opposing portions is sandwiched by the restricting portion of the weak portion. It is preferable that it is formed to be smaller than the width in the direction to be measured.
As described above, the distance between the two opposing portions formed at the position where the fragile portion is sandwiched in the restricting portion is formed to be smaller than the width of the fragile portion (the width in the direction sandwiched by the restricting portion). When the impact load is applied and the fragile portion is deformed, the opposing portions of the restricting portion easily come into contact with each other. When the distance between the opposing portions is formed larger than the width of the fragile portion or approximately the same size, the deformation (bending) of the fragile portion is caused by the restricting portion when the impact load is particularly large. The fragile portion may be completely bent before being pressed down, and it is difficult to regulate the deformation amount (bending amount). However, with the above configuration, the deformation is restrained by the restricting portion before the weak portion is completely deformed (bent), and the deformation amount of the weak portion is more effectively regulated (controlled). )can do.
Further, depending on the distance between the opposing portions of the restricting portion, the timing at which the restricting portions contact each other can be set.

Specifically, as in claim 4, the support bracket is further provided with a restricting portion that is disposed at a position where a part of the fragile portion is sandwiched to restrict a deformation amount of the fragile portion, and the support bracket is provided. The bracket is disposed on the vehicle front side of the seat and supports a load applied to the front side of the seating frame, and the bracket is disposed on the vehicle rear side of the seat and on the rear side of the seating frame. A rear side support bracket that supports a load to be applied, and the weakened portion is disposed on a surface of the front side support bracket facing the vehicle front side, and the restriction portion is It is preferable that the protrusion is formed so as to protrude from the surface facing the vehicle rear side of the front support bracket toward the vehicle rear side.

In other words, the front support bracket has a fragile portion that is deformed when an impact load is applied. When an impact load such as a rear collision is applied to the vehicle seat, the front portion starts from the fragile portion. The side support bracket can be deformed to absorb impact energy.
In other words, when an impact load is applied, the occupant's body sinks backward, and the front support bracket moves upward with the fragile portion as a fulcrum (the side connected to the rail). Falls to the rear of the vehicle.
In that case, the surface of the front support bracket facing the vehicle rear side is provided with a restricting portion protruding toward the vehicle rear side, and when the weak portion is deformed to a certain position (shape), the facing restricting portion becomes This makes contact so that the fragile portion is prevented from being further deformed. Therefore, the deformation amount of the fragile portion does not become larger than a certain value, and as a result, the deformation amount (bending amount) of the front support bracket can be regulated (controlled) to be equal to or less than a certain value.
Further, as described above, when an impact load is applied, the amount of deformation of the rear side support bracket is restricted so as not to become too large, so that the influence on the seating posture of the occupant is reduced.

Further, according to a fifth aspect of the present invention, the fragile portion formed on the vehicle front side support bracket protrudes into a long hole that divides the surface of the front side support bracket facing the vehicle front side in the vehicle width direction or the vehicle rear side. It is preferable that the groove is formed as follows.
If comprised in this way, when a weak part deform | transforms, it will become easy to deform | transform and it can absorb impact energy more effectively.
In addition, since the fragile portion extends along the vehicle width direction, even when a load in the left-right direction is applied, it is possible to receive the load at the ridge line portion, and against the load in the seat width direction. Stiffness can be improved.

Further, specifically, as in claim 6, the bracket is further provided with a restricting portion that is disposed at a position sandwiching a portion of the fragile portion and restricts the deformation amount of the fragile portion, The support bracket is disposed on the vehicle front side of the seat and supports a load applied to the front side of the seating frame, and is disposed on the vehicle rear side of the seat and on the rear side of the seating frame. A rear support bracket that supports a load applied to the rear portion, and the weakened portion and the restricting portion are disposed on a surface of the rear support bracket facing the vehicle rear side. Is preferred.
In other words, the rear support bracket is provided with a fragile portion that deforms when an impact load is applied, so that when an impact load such as a rear collision is applied to the vehicle seat, the rear portion starts from the fragile portion. The side support bracket can be deformed to absorb impact energy.
In other words, when the impact load is applied, the rear side support bracket bends, so that the rear side of the seating frame sinks. For this reason, a passenger | crew's body sinks back, and a body is efficiently left to a seat back. Therefore, impact energy can be absorbed efficiently.
And since the restriction part which opposes the position which pinches | interposes a weak part is formed so that the deformation amount of a weak part may be controlled, if a weak part deform | transforms to a fixed position (shape), the opposing restriction part will contact. As a result, the fragile portion is pressed against further deformation. Therefore, the deformation amount of the fragile portion does not become larger than a predetermined value, and as a result, the deformation amount (bending amount) of the rear side support bracket can be regulated (controlled) to be equal to or less than a predetermined value.
Further, as described above, when an impact load is applied, the amount of deformation of the rear side support bracket is restricted so as not to become too large, so that the influence on the seating posture of the occupant is reduced.

At this time, more specifically, as in claim 7, bracket rib walls that bend downward from both sides in the vehicle width direction and hang down on the front surface of the rear support bracket facing the vehicle rear side. The fragile portion is formed in the bracket rib wall so as to be continuous with the cut portion formed as a groove or a hole portion that divides the bracket front surface along the vehicle width direction. It is preferable to have a deformed hole portion that is a hole.
If comprised in this way, when an impact load is added and a weak part deform | transforms, it will become easy to deform | transform and it can absorb impact energy more effectively.
In addition, since the fragile portion extends along the vehicle width direction, even when a load in the left-right direction is applied, it is possible to receive the load at the ridge line portion, and against the load in the seat width direction. Stiffness can be improved.
The “vehicle width direction” is a term for the “vehicle longitudinal direction” and does not define the direction with a strict angle.
In other words, “along the vehicle width direction” means “extends along the direction close to the vehicle width direction” (rather than the direction close to the vehicle front-rear direction), and means exactly matching the vehicle width direction. Not what you want. The same applies hereinafter.

As another specific example, a bracket rib wall that is bent downward from both sides in the vehicle width direction and hangs down is provided on the front surface of the bracket that faces the vehicle rear side of the support bracket. And the said weak part is a groove | channel which divides the said bracket front surface along a vehicle width direction, and it is suitable when the said groove | channel extends to the boundary part of the said bracket front surface and the said bracket rib wall.
If comprised in this way, since a weak part is extended to the boundary part (it is a highly rigid part) of a bracket front surface and a bracket rib wall, a back side support bracket becomes easy to deform | transform at the time of impact load addition.

At this time, as in claim 9, a hole is formed in a boundary portion between the bracket front surface and the bracket rib wall, and an end in the vehicle width direction of the groove is formed with the hole. It is preferable that they are continuous.
With this configuration, a hole is formed at the boundary between the bracket front surface and the bracket rib wall (which is a highly rigid portion), so that the rear support bracket is more easily deformed when an impact load is applied. .

Further, at this time, if the bracket rib wall is formed with a protrusion or a recess continuous with the hole, the rear support bracket is more easily deformed when an impact load is applied. Is preferred.
Further, as in claim 11, if the bracket rib wall has a protrusion that is continuous with the hole, the rear support bracket is more easily deformed when an impact load is applied. It is.

At this time, as in the twelfth aspect, the support brackets are respectively provided on both sides of the seating frame in the vehicle width direction, and the support brackets are disposed on the vehicle front side of the seat, and A front-side support bracket that supports a load applied to the front side, and a rear-side support bracket that is disposed on the vehicle rear side of the seat and supports a load applied to the rear side of the seating frame. The fragile portions provided on both sides in the vehicle width direction are arranged on the surface facing the vehicle rear side of the rear side support bracket or the surface facing the vehicle front side of the front side support bracket from the vehicle floor. It is suitable if it is formed along the vehicle width direction at the same height.
By being configured in this way, the fragile portion can be formed at a position where the height from the vehicle body floor is the same. Therefore, it becomes easy to control the deformation position of the side component when an impact load is applied.

In this case, more specifically, as in claim 13, the restricting portion is formed at a position sandwiching the fragile portion in the vertical direction, and constitutes a first restricting portion disposed above the fragile portion. The first facing portion and the second facing portion constituting the second restricting portion disposed below the fragile portion are disposed so as to face each other with respect to the fragile portion. At least a part of the first facing part and at least a part of the second facing part come into contact with each other when the deformation amount of the side component member reaches a predetermined amount, and the deformation of the side component member It is preferable to be configured to regulate the amount.
If comprised in this way, the deformation amount of a weak part can be controlled effectively.

Furthermore, as a detailed configuration, as in claim 14, the fragile portion is formed as a recess or a hole formed in a groove shape, and the first facing portion and the second facing portion are Is configured to be smaller than a width of a position that is an opening of the recess or the hole and that is aligned with a position sandwiched between the first facing surface and the second facing surface. It is preferable.
With this configuration, when the fragile portion is bent, the restricting portions (the first restricting portion and the second restricting portion) disposed with the fragile portion interposed therebetween are likely to come into contact with each other at a certain position. It can be made to hold down the deformation of the weak part.

At this time, as in the fifteenth aspect, the first facing surface and the second facing surface are arranged on one side for transmitting the acting force that induces the deformation to the other when the side component member is deformed. It is preferable that the distance in the horizontal direction is configured to be smaller than the distance in the horizontal direction on the side to which the acting force that induces the deformation is transmitted when the side component member is deformed.

With this configuration, one of the first restricting portion and the second restricting portion can be formed wider than the other, and when an impact load is applied, for example, the rear support bracket is twisted. Even if it is a case where it deform | transforms, it becomes easy to contact | abut a 1st control part and a 2nd control part. That is, by forming one side wide, even if the rear side support bracket is tilted backward so as to be twisted due to a complicated input load, the first restriction portion and the second restriction portion Because of the contact, the amount of deformation of the support bracket can be controlled effectively.

Also, when attaching both restricting portions to the rear support bracket by welding work or the like, one of them has a wide shape, so it is not necessary to strictly define the mounting position. For example, even if the attachment position of the other restricting portion is slightly shifted in the horizontal direction (left and right direction) with respect to one restricting portion, either one of the restricting portions is formed wide, so that the rear side When the support bracket is tilted backward, the first restricting portion and the second restricting portion can be brought into contact with each other. As a result, since it is not necessary to perform exact positioning at the time of attaching both the restricting portions, workability is improved.

According to a sixteenth aspect of the present invention, the first restricting portion and the second restricting portion are integrally formed by being connected with the first facing surface and the second facing surface facing each other. It is preferable.
Thus, the distance between both opposing surfaces can be set with high accuracy by integrally forming the first restricting portion and the second restricting portion arranged in parallel in the vertical direction. Moreover, when attaching both control parts to a back side support bracket, since a fastening (joining) location can be reduced, the cost concerning a manufacturing process can be reduced.

At this time, as in claim 17, it is preferable that at least one fastening portion extending outward is formed in the first restricting portion and the second restricting portion.
If comprised in this way, rather than attaching a control part using means, such as welding, both control parts can be attached to a back side support bracket by a fastening means. Therefore, both restricting portions can be arbitrarily removed in accordance with the design of the vehicle seat. Moreover, the rigidity of a 1st control part and a 2nd control part can be improved by forming a fastening part in a 1st control part and a 2nd control part, respectively.

According to the first aspect of the invention, in the vehicle seat, the seating frame is connected to the vehicle floor, and is deformed when an impact load is applied to the vehicle rear side of the support bracket that supports the load from the seating frame. It was equipped with a vulnerable part. For this reason, impact energy can be absorbed efficiently and the influence on the seating posture of the occupant can be reduced.
According to invention of Claim 2, the control part which controls the deformation amount of a weak part was provided. Therefore, it can regulate so that the amount of deformation of a weak part may not become larger than a predetermined value. Further, by controlling the deformation amount of the seat (support bracket), it is possible to reduce the influence on the seating posture of the occupant.
According to invention of Claim 3, since the width | variety of the opposing parts of a control part is formed smaller than the width | variety of a weak part, it is weak by a control part before a weak part deform | transforms completely (bending). Since the deformation of the portion is suppressed, the deformation amount of the fragile portion can be effectively controlled.
According to the fourth aspect of the present invention, when an impact load is applied to the front side support bracket, the deformation amount of the front side support bracket is restricted so as not to become too large. It is reduced.
According to the fifth aspect of the present invention, when an impact load is applied to the front support bracket and the fragile portion is deformed, it is easily deformed, and the impact energy can be absorbed more effectively. Further, even when a load in the left-right direction is applied, the load can be received at the ridge line portion, and the rigidity against the load in the seat width direction can be improved.
According to the invention of claim 6, when an impact load is applied to the rear side support bracket, the rear side support bracket is regulated so that the deformation amount of the rear side support bracket does not become too large. It is reduced.
According to the invention of claim 7, when an impact load is applied to the rear side support bracket and the fragile portion is deformed, it becomes easy to deform, and the impact energy can be absorbed more effectively. Further, even when a load in the left-right direction is applied, the load can be received at the ridge line portion, and the rigidity against the load in the seat width direction can be improved.
According to the eighth aspect of the present invention, the fragile portion extends to the boundary portion (high rigidity portion) between the bracket front surface and the bracket rib wall, so that the rear side support bracket is easily deformed when an impact load is applied.
According to the ninth aspect of the present invention, since the hole is formed in the boundary portion (high rigidity portion) between the bracket front surface and the bracket rib wall, the rear side support bracket is further easily deformed when an impact load is applied. .
According to the tenth and eleventh aspects of the present invention, the rear support bracket is more easily deformed when an impact load is applied.
According to the twelfth aspect of the present invention, it is easy to control the deformation position of the side component when an impact load is applied.
According to the invention of claim 13, the deformation amount of the fragile portion can be regulated effectively.
According to the fourteenth aspect of the present invention, when the fragile portion is bent, the restricting portions are easily brought into contact with each other, and the deformation of the fragile portion can be suppressed at a certain position.
According to the fifteenth aspect of the present invention, even when the rear side support bracket is tilted backward so as to be twisted due to a complicated input load, the deformation amount of the rear side support bracket can be effectively controlled. it can.
According to the sixteenth aspect of the invention, the distance between the opposing surfaces can be set with high accuracy, and the number of fastening (joining) points can be reduced, so that the cost for the manufacturing process can be reduced.
According to the invention of claim 17, both the restricting portions can be arbitrarily removed in accordance with the design of the vehicle seat, and the rigidity of the first restricting portion and the second restricting portion can be improved.

1 is a schematic perspective view of a vehicle seat according to an embodiment of the present invention. 1 is a schematic perspective view of a seat frame according to an embodiment of the present invention. It is a schematic perspective view of the rail mechanism which concerns on one Embodiment of this invention. It is an exploded view of the rail mechanism which concerns on one Embodiment of this invention. It is a schematic perspective view of the support bracket (there is no restriction part) concerning one embodiment of the present invention. It is a schematic perspective view of the support bracket (with a control part) which concerns on one Embodiment of this invention. It is explanatory drawing which shows the state before the rear surface collision of the support bracket which concerns on one Embodiment of this invention. It is explanatory drawing which shows the state after the rear surface collision of the support bracket which concerns on one Embodiment of this invention. It is explanatory drawing of the support bracket which concerns on 2nd Embodiment of this invention. It is explanatory drawing of the support bracket which concerns on 3rd Embodiment of this invention. It is explanatory drawing of the support bracket which concerns on 4th Embodiment of this invention. It is explanatory drawing of the 2nd weak part which concerns on 5th Embodiment of this invention. It is a front view of the 2nd weak part which concerns on 5th Embodiment of this invention. It is explanatory drawing of the 3rd weak part which concerns on 6th Embodiment of this invention. It is a front view of the 3rd weak part concerning a 6th embodiment of the present invention. It is explanatory drawing of the 4th weak part which concerns on 7th Embodiment of this invention. It is a front view of the 4th weak part which concerns on 7th Embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The members, arrangements, and the like described below do not limit the present invention, and various modifications can be made in accordance with the spirit of the present invention. In this specification, a vehicle means a vehicle for traveling on which a seat can be mounted, such as a vehicle for traveling on the ground having wheels such as an automobile or a railroad, an aircraft or a ship moving on the ground, and the like. Further, the normal seating load includes a seating impact that occurs when sitting, a load during acceleration caused by sudden start of the vehicle, and the like. The impact energy at the time of rear collision is energy due to a large load generated at the time of rear collision, which is caused by a large rear collision by a vehicle from the rear side, a large collision at the time of reverse traveling, etc. It does not include energy due to the load in the load region similar to the load.
Moreover, the left-right direction means the left-right direction in a state of facing the front of the vehicle, and is a direction that coincides with the width direction of the seat back frame 1 described later. In addition, the front-rear direction is a thing that means the front-rear direction in a state where an occupant is seated.

1 to FIG. 8 relate to one embodiment (first embodiment) of the present invention, and FIG. 9 to FIG. 17 relate to second embodiment to seventh embodiment, which are other embodiments of the present invention. Is.

(First embodiment)
<< Basic configuration of vehicle seat S >>
With reference to FIG. 1 thru | or FIG. 7, the vehicle seat S which concerns on embodiment is demonstrated.
As shown in FIG. 1, the vehicle seat S includes a seat back S <b> 1 (back portion), a seating portion S <b> 2, and a headrest S <b> 3, and the seat back S <b> 1 (back portion) and the seating portion S <b> 2 are cushion pads P <b> 1 on the seat frame F. , P2 is placed and covered with the skin materials L1, L2. In addition, the headrest S3 is formed by arranging a cushion pad P3 on a core material (not shown) of the head and covering with a skin material L3. Reference numeral 19 denotes a headrest pillar that supports the headrest S3.

As shown in FIG. 2, the seat frame F of the vehicle seat S includes a seat back frame 1 constituting the seat back S1, a seating frame 2 constituting the seating portion S2, and a rail mechanism 3.
The seating frame 2 has the structure in which the cushion pad P2 is placed as described above, is covered with the skin material L2 from above the cushion pad P2, and supports the occupant from below.

As shown in FIG. 2, each seating side frame 2 a constituting the seating frame 2 is a sheet metal member extending in the front-rear direction, and is connected to the seatback frame 1 at the rear end. Also, the seating side side frame 2a on one side in the left-right direction (left side) and the seating side side frame 2a on the other side in the left-right direction (right side) are spaced apart in the left-right direction in a parallel state. The seating side frames 2a are connected to each other via the rear connection pipe 2b on the rear end side and the front connection pipe 2c on the front end side.
The rear connection pipe 2b and the front connection pipe 2c are pipe members extending from one end in the width direction of the vehicle seat S to the other end.

Further, a plurality of S springs 2d (four in the case shown in FIG. 2) are arranged between the seating side frames 2a. The S spring 2d is a support spring that supports the cushion body from below, and extends in the front-rear direction while meandering. In addition, each S spring 2b is hung on a construction pan (not shown) with a front end portion laid between the seating side frames 2a, and a rear end portion of the S spring 2b is more specifically described above. Is placed between the seating side frame 2a by being hooked on a substantially arc-shaped hooking member fitted to the rear connecting pipe 2b. Then, the cushion body is mounted on the installation pan (not shown) and the S spring 2d.

As shown in FIG. 2, a pair of rail mechanisms 3 according to the present embodiment is provided, and one (left side) rail mechanism 3 and the other (right side) rail mechanism 3 are separated in the left-right direction in a state of being parallel to each other. is doing.
As shown in FIGS. 2 and 3, each rail mechanism 3 includes a lower rail 31 fixed to the vehicle body floor, an upper rail 32 that engages with the lower rail 31 and can slide on the lower rail 31, and a lower rail. 31 has a support bracket 33 that is attached to the lower surface of the vehicle body and functions as a connecting member to the vehicle body floor, and a mounting bracket 35 that is attached to the upper surface of the upper rail 32 and functions as a connecting member of the seating side frame 2a.

Each of the lower rail 31 and the upper rail 32 is provided in pairs, and each extends along the front-rear direction.
As shown in FIG. 2, the pair of upper rails 32 are arranged in parallel with each other at an interval in the left-right direction, and the upper rails 32 are connected by a slide lever 34.
As described above, the upper rail 32 is slidably disposed on the lower rail 31. Further, as shown in FIGS. 3 and 4, a mounting bracket 35 is provided on the upper rail 32 with bolts 38 and nuts as fastening members. Is fixed. As shown in FIG. 2, the seating side frame 2 a of the vehicle seat S is connected to the mounting bracket 35, so that the vehicle seat S is attached to each upper rail 32, and the vehicle seat S is attached to the upper rail 32. It is mounted on each of the lower rails 31 via.

On the other hand, as shown in FIG. 2, the pair of lower rails 31 are arranged in parallel with each other at an interval in the left-right direction, and the lower rails 31 are connected by a member frame (not shown).
As shown in FIGS. 2 to 4, support brackets 33 are attached to the lower surfaces of the lower rails 31. When the support bracket 33 is fastened to the vehicle body floor, the lower rail 31 is fixed to the vehicle body floor.
Each of the support brackets 33 is attached to each end portion in the vehicle front-rear direction. Of these, the one attached to the vehicle rear side end portion of the lower rail 31 is referred to as a “rear side support bracket 33A”, and the front What is attached to the side is referred to as “front support bracket 33B”.

As shown in FIGS. 2 to 4, the front support bracket 33B has a front rail attachment portion 133a and a front vehicle attachment portion 133b extending from the front rail attachment portion 133a at an obtuse angle downward from the vehicle. Configured.
The lower surface of the front end of the lower rail 31 is placed and fixed on the upper surface of the front rail mounting portion 133a, and the front vehicle mounting portion 133b is fixed to the vehicle side.
As shown in FIG. 4, the front vehicle mounting portion 133b is provided with a fragile portion 33b that deforms when an impact load is applied, and a position that sandwiches a portion of the fragile portion 33b. And a regulating portion 540 that regulates the amount.
In addition, although this weak part 33b should just be formed by the hole part, the recessed part, etc., in this embodiment, it is formed as a groove | channel extended in a vehicle width direction.
That is, in this embodiment, the weak part 33b is formed in the surface which faces the vehicle front of the front vehicle attachment part 133b as a long groove which protruded toward the vehicle rear, and the regulation part 540 is a front vehicle attachment. It is formed as a protruding edge protruding rearward from the surface of the portion 133b facing the rear of the vehicle.
This peripheral structure will be described in detail later.

As shown in FIGS. 3 to 5, the rear support bracket 33A includes a rear rail attachment portion 133c, a rear vehicle attachment portion 133d, and the rear rail attachment portion 133c and the rear vehicle attachment portion 133d. It has a rear bracket inclined portion 133e to be cross-linked and is formed in a substantially Z shape in a side view.
That is, the rear rail mounting portion 133c is disposed substantially horizontally with the vehicle floor surface, and the rear bracket inclined portion 133e is directed from the rear end of the rear rail mounting portion 133c toward the rear of the vehicle. It extends so as to descend at an obtuse angle.
The rear vehicle attachment portion 133d is substantially parallel to the rear rail attachment portion 133c from the vehicle rear side end (lower end side) of the rear rail attachment portion 133c toward the vehicle rear (that is, And so as to be substantially horizontal to the vehicle floor surface.
The rear rail mounting portion 133c, the rear vehicle mounting portion 133d, and the rear bracket inclined portion 133e constitute a rear support bracket 33A that is substantially Z-shaped in a side view.

The rear rail mounting portion 133c and the rear bracket inclined portion 133e may be formed in a flat plate shape, but in this embodiment, as shown in FIG. A rib wall extending so as to hang vertically is provided.
In other words, the rear rail attachment portion 133c and the rear bracket inclined portion 133e are configured such that the end surfaces in the vehicle width direction are substantially U-shaped open downward.
With such a configuration, the strength of the rear support bracket 33A is improved.

The rear vehicle attachment portion 133d may also be formed in a flat plate shape, but in the present embodiment, as shown in FIG. 5, a portion (bent portion) continuous with the rear bracket inclined portion 133e. It was set as the structure provided with the rib wall which stands up from the peripheral edge part except for.
In other words, the rear vehicle attachment portion 133d is configured to have a substantially cup shape with a bottom that opens upward.
With such a configuration, the strength of the rear support bracket 33A is improved.
In addition, a fastening hole for fastening a fastening member (for example, a bolt) through the fastening portion (for example, a bolt) is formed on the bottom surface portion of the rear vehicle attachment portion 133d, and the fastening is performed when the fastening member is fastened to the fastening hole. It is also possible to protect the head of the member.

Further, as shown in FIG. 5, when an impact load is applied to the rear support bracket 33A (in this embodiment, the rear bracket inclined portion 133e) attached to each of the lower rails 31 arranged in the left-right direction. And a restricting portion 40 that is disposed at a position sandwiching a portion of the fragile portion 33a and restricts the amount of deformation of the fragile portion 33a.
The fragile portion 33a is formed by a hole, a concave portion or the like.
This peripheral structure will be described in detail later.

In the state where the vehicle seat S is placed on each of the lower rails 31, the seating side side frame 2a on one end side in the left and right direction (left side) is positioned above the lower rail 31 on one end side in the left and right direction (left side), The seating side frame 2a on the other end side (right side) in the left-right direction is located above the lower rail 31 on the other end side (right side) in the left-right direction. Further, in a state where the vehicle seat S is placed on each of the lower rails 31, each of the plurality of S springs 2 d described above is positioned between the lower rails 31 in a state of being aligned in the left-right direction.

As described above, the seating frame 2 is supported by the rail mechanism 3 including the support bracket 33 and is assembled in a slide type that can be adjusted in the front-rear position with respect to the vehicle body floor.
Further, the rear end portion of the seating frame 2 is connected to the seat back frame 1 via a reclining mechanism 11.

As shown in FIG. 2, the reclining mechanism 11 includes a reclining shaft 11 a along at least the rotation axis of the reclining mechanism 11, and the reclining shaft 11 a is configured to be seat back frame 1 (more specifically, a pair of side frames). 15) is fitted and arranged so as to protrude from the shaft insertion hole 11c provided in the pair of side frames 15 to the side of the seat frame F.

The seat back S1 has the cushion pad P1 mounted on the seat back frame 1 as described above, and is covered with the skin material L1 from above the cushion pad P1, and supports the back of the occupant from the rear. . In the present embodiment, as shown in FIG. 2, the seat back frame 1 is a substantially rectangular frame, and includes a side frame 15, an upper frame 16, and a lower frame framing portion 18.
The side frame 15 and the upper frame 16 correspond to the side constituent members recited in the claims.
In addition, the lower end side of the side frame 15 and the lower frame erection part 18 may be configured integrally.

The two (a pair of) side frames 15 are arranged so as to be separated from each other in the left-right direction and to extend in the up-down direction in order to form a seat back width. An upper frame 16 that connects the upper end sides of the pair of side frames 15 extends upward from the side frames 15.

The upper frame 16 according to the present embodiment is a substantially U-shaped member that extends upward from one side frame 15, then bends, and extends to the other side frame 15. A bent steel pipe is used.
The steel pipe constituting the upper frame 16 may have a closed cross-sectional shape. For example, a pipe having a circular or rectangular cross-sectional shape is used.
In this embodiment, a pipe having a circular cross section is used.

In other words, the upper frame 16 includes a portion (hereinafter referred to as “upper frame upright portion 16 </ b> A”) spaced apart in the left-right direction so as to extend from the side frame 15 of the upper frame 16, The upper frame uprights 16A, 16A arranged in the left-right direction are substantially U-shaped by pillar mounting portions 16B that are bent and extended so as to bridge the upper end side (the side opposite to the side on which the seating frame 2 is disposed). It is configured in shape.
The upper frame upright portion 16A of the upper frame 16 overlaps the side plate 15a of the side frame 15 at one end side (lower end side: the side opposite to the side where the pillar mounting portion 16B is extended) along the vertical direction. Are arranged and fixedly joined to the side frame 15 at the overlapping portion. In the present embodiment, the upper frame 16 is formed of a tubular member having a circular cross section, but may be a tubular member having a rectangular cross section.

Further, a headrest S3 is disposed above the upper frame 16. As described above, the headrest S3 is configured by providing the cushion pad material P3 on the outer periphery of the core material (not shown) and covering the outer periphery of the cushion pad material P3 with the skin material L3. A pillar support portion 19 a is disposed on the upper frame 16. A headrest pillar 19 (see FIG. 1) that supports the headrest S3 is attached to the pillar support portion 19a via a guide lock (not shown), and the headrest S3 is attached. In the present embodiment, an example in which the seat back S1 and the headrest S3 are separately formed has been described. However, a bucket type in which the seat back S1 and the headrest S3 are integrally formed may be used.

As shown in FIG. 2, the side frame 15 constituting a part of the seat back frame 1 is an extending member constituting the side surface of the seat back frame 1, and includes a flat side plate 15a and a front end portion of the side plate 15a ( It has a front edge portion 15b bent inward in a U-shape from an end located on the vehicle front side), and a rear edge portion 15c bent inward in an L-shape from the rear end portion.

The front edge portion 15b of the present embodiment is formed with a projection 15d that protrudes toward the rear edge 15c, and this projection 15d is for locking a tension coil spring 55 as an urging means. A locking hole as a locking portion is formed.
And the below-mentioned moving member 50 is latched by the side frame 15 of this embodiment. The configuration and operation of the moving member 50 will be described later.

The lower side of the side frame 15 (below the side plate 15a) is bridged by the lower frame erection part 18. The lower frame erection part 18 (member center) is formed so as to bridge and connect the lower side of the pair of side frames 15 (lower side plate 15a) spaced apart in the left-right direction.
In addition, although the seat back frame 1 of the present embodiment shows an example in which the side frame 15 (below the side plate 15a) and the lower frame erection portion 18 are formed as separate members, they may be formed integrally.

A shaft insertion hole 11c (not shown) through which the reclining shaft 11a is inserted is formed below the side frame 15 (below the side plate 15a), and the seating frame 2 is disposed below the side frame 15 via the reclining mechanism 11. Has been.
In the present embodiment, the side plate 15a of the side frame 15 is constituted by a single plate.
That is, as in other configurations, the side of the seat back frame 1 is not divided into the side frame 15 and the lower frame base connected to the lower end portion of the side frame 15, but these are integrated. It was.
By being integrally formed in this way, the number of parts can be reduced, and the cost can be reduced.

<< Configuration of Pressure-Receiving Member 20 >>
In the seat back frame 1 (between the side frames 15 on both sides), a pressure receiving member 20 as a pressure receiving member that supports the cushion pad P1 from the rear is disposed in the inner region of the seat back frame 1.

The pressure receiving member 20 of the present embodiment is a member in which resin is formed in a plate-like substantially rectangular shape, and smooth unevenness is formed on the surface in contact with the cushion pad P1. As shown in FIG. 2, claw portions for locking the wire 21 as the upper connecting member and the wire 22 as the lower connecting member are formed on the upper and lower sides of the pressure receiving member 20. .

The pressure receiving member 20 of this embodiment is supported by the connecting member. That is, two wires 21 and 22 as connecting members are laid between the side frames 15 on both sides, and the pressure receiving member 20 is connected to the pressure receiving member 20 by the claw portions formed at predetermined positions on the upper side and the lower side of the pressure receiving member 20. The pressure receiving member 20 is engaged and supported on the back surface of the cushion pad P1. The wires 21 and 22 are formed from a steel wire having spring properties, and an uneven portion which is a connecting portion is formed.

Particularly, of the two wires 21 and 22 locked to the pressure receiving member 20 of the present embodiment, the upper wire 21 is formed of a wire thinner than the lower wire 22. Thereby, the upper part of the pressure receiving member 20 is more easily moved backward than the lower part.

Also, since the wire 22 is composed of a thick wire, it has high rigidity and is difficult to deform during normal seating. Therefore, at the time of normal seating, the upper side of the pressure receiving member 20 supported by the wire 21 made of a thin wire easily moves backward, and the lower side of the pressure receiving member 20 supported by the wire 22 made of a thick wire does not move greatly backward. . As a result, during normal sitting, the upper part of the pressure receiving member 20 sinks moderately rearward, and the lower part supports the occupant's body, so that the seating feeling is not impaired.

Furthermore, since the wires 21 and 22 are formed with the concavo-convex portions, the wires 21 and 22 are greatly deformed by a predetermined load or more (a load larger than a movable or rotating load of an impact reducing member described later), and the pressure receiving member 20 is increased. It is configured to move backward with the amount of movement.

As shown in FIG. 2, of the two wires 21 and 22 locked to the pressure receiving member 20 of the present embodiment, both ends of the wire 21 locked to the upper side are provided on the side frames 15 on both sides. It is hooked on the supported shaft 21a. On the other hand, both ends of the wire 22 locked to the lower side are hooked to the moving members 50 mounted on the left and right side frames 15.

The wire 22 made of a wire thicker than the wire 21 is not easily deformed as described above, and the lower portion of the pressure receiving member 20 is difficult to move backward during normal seating. Therefore, the moving member 50 is attached to the end portion of the wire 22 in order to ensure a sufficient sinking amount at the time of a rear collision.

<< Configuration of Moving Member 50 >>
The moving member 50 as an impact reducing member moves to the rear of the vehicle by an impact load transmitted via the connecting member (wire 22) when an impact load of a predetermined level or more is applied to the pressure receiving member 20 due to a rear collision or the like, and the pressure receiving member 20 is moved backward, and the occupant is moved backward. “Movement” refers to movement such as horizontal movement and rotation. In the present embodiment, the moving member 50 that rotates about the shaft portion 52 as a rotation axis will be described. Due to the movement of the moving member 50 to the rear of the vehicle, the pressure-receiving member 20 can be moved greatly to the rear of the vehicle. As a result, the occupant is moved rearward, so that the load on the occupant can be efficiently reduced.

As shown in FIG. 2, the moving member 50 of the present embodiment is pivotally supported inside the side plates 15a of the side frames 15 on both sides via a shaft portion 52 as a pivot shaft, The wire 22 is locked and connected to a spring (a tension coil spring 55) as an urging means for urging the wire 22. That is, the moving member 50 is connected to the urging means 55 and is configured to urge the pressure receiving member 20 toward the front side of the seat back frame 1 via the wire 22 as a connecting member.
The moving member 50 according to the present embodiment is provided with a shaft 52 on a convex portion 15e formed by a pivotable shaft portion 52, and more specifically, a part of the side plate 15a bulges inside the seat. It is supported.

The moving members 50 described above are attached to the side frames 15 on both sides, and both ends of the wire 22 are hooked on the moving members 50 arranged on both sides, respectively. It is configured to operate.
In this embodiment, the moving member 50 is attached to the side frames 15 on both sides, and the moving members 50 attached to both sides are configured to move (turn) independently of each other. For this reason, when the load is biased in the left-right direction, the moving members 50 attached to the side frames 15 on both sides independently move (rotate) in accordance with the load. Depending on the size, the occupant's body can be sunk backwards.

(Operational effect of the pressure receiving member 20 and the moving member 50)
Hereinafter, configurations and operations of the pressure receiving member 20 and the moving member 50 will be described.
During normal seating when the occupant is seated, a tension is generated that causes the moving member 50 to move backward (turn) via the cushion pad P1, the pressure receiving member 20, and the wire 22 in the seat back S1. On the other hand, the tension coil spring 55 urges the moving member 50 to move (rotate) to the front side of the seat back frame 1. Here, since the tension coil spring 55 connected to the moving member 50 has a load characteristic that does not bend in a load region generated during normal seating, the moving member 50 is always restrained to the initial position. . That is, it is configured such that the force for returning to the initial state against the force for moving (turning) the moving member 50 is maximized during normal seating.

The movement preventing portion 59 provided in the moving member 50 is a contact portion that contacts the rear edge portion 15c of the side frame 15 and prevents the movement (turning) after the moving member 50 moves (turns). .
The movement preventing portion 59 of the moving member 50 is integrally formed by extending the moving member 50 in the outer circumferential direction, and the side frame 15 (more specifically, the rear edge) after the contact surface moves (rotates). Since it abuts against the portion 15c), the movement (turning) of the moving member 50 can be stably stopped even when a predetermined impact load or more is applied to the pressure receiving member 20 due to a rear collision or the like.
The movement preventing portion 59 is formed at a position where it does not interfere with the urging means (the tension coil spring 55) and the connecting member (the wire 22).

In the present embodiment, the movement preventing portion 59 of the moving member 50 is configured to directly contact the side frame 15 to prevent movement (turning). However, the movement preventing portion 59 and the side frame 15 In order to eliminate the noise generated during the contact, a silencer such as a rubber having a thickness that does not hinder the stability of the movement (rotation) stop of the moving member 50 can be attached. If it comprises, the stable movement (rotation) prevention can be performed, and the silencing effect can be expected.

At all times, the moving member 50 abuts against the side frame 15 (more specifically, a portion in which a part of the convex portion 15e is cut out), and presses the upward force applied by the tension coil spring 55, so that the moving member 50 The range of movement (rotation) is limited so that it does not move (rotate) too much forward.

At the time of a rear collision, if the occupant tries to move backward due to inertia, the load moves the moving member 50 backward (rotates) via the pressure receiving member 20 and the wire 22 locked to the pressure receiving member 20. Tension is applied in the direction of movement. The tension at this time is a load sufficient to extend the tension coil spring 55 that holds the moving member 50 in the initial position and to move (turn) the moving member 50 backward.

The threshold value of the force at which the moving member 50 starts moving (turning) is set to a value larger than a normal seating load.
Here, the threshold value of the force at which the moving member 50 starts to move (rotate) is applied to the seat back S1 in a normal sitting state (here, excluding a small impact caused by a seating impact or a sudden start of a vehicle). Since such a load is about 150N, the threshold value is preferably larger than 150N.

Further, it is preferable to set a value larger than 250 N in consideration of a seating impact that occurs during normal seating and a load during acceleration that occurs due to a sudden start of the vehicle. Does not operate and can maintain a stable state.

As described above, by moving (turning) the moving member 50 backward, the wire 22 hooked on the moving member 50 moves backward, and the pressure receiving member 20 locked to the wire 22 together with the wire 22 is moved. Then, the cushion pad P1 supported by the pressure receiving member 20 moves rearward, and the occupant can be sunk into the seat back S1.

Since the moving member 50 has the above-described movement (turning) characteristics with respect to the tension generated via the wire 22, when the rear collision occurs, the occupant is seated back effectively and efficiently. It can be sunk into the cushion pad P1 of S1.
At this time, the occupant's back is moving backward by sinking into the seat back S1, but the position of the headrest S3 does not change relative to the seat back S1, so the gap between the headrest S3 and the head of the occupant Since the head is shrunk and the headrest S3 can support the head, the impact applied to the neck can be effectively reduced.

In the above embodiment, an example in which the moving member 50 is provided on the left and right side frames 15 is shown, but a configuration in which the moving member 50 is provided only on one side frame 15 is also possible. In this case, the wires 21 and 22 can be directly engaged with the side frame 15 on the side where the moving member 50 is not provided.

( Vulnerable parts 33a and 33b and regulating parts 40 and 540)
The vehicle seat S of the present invention is provided with a fragile portion that deforms when an impact load is applied ( fragile portions 33a and 33b described below) and a portion that sandwiches a portion of the fragile portion. And a restricting portion (a restricting portion 40, 540 described below) for restricting the deformation amount of the portion.
In the following description, the rear support brackets 33A and 33A (in this embodiment, the rear bracket inclination) that are attached to the vehicle rear side end portions of the pair of lower rails 31 and 31, respectively, of the pair of support brackets 33 and 33. Front side support bracket 33B attached to the vehicle front side end portion of each of the pair of lower rails 31 and 31 will be described, in which the fragile portions 33a and 33a and the restriction portions 40 and 40 are respectively formed in the portions 133e and 133e). , 33B (in the present embodiment, front vehicle mounting portions 133b, 133b), the weak portions 33b, 33b and the restricting portions 540, 540 are respectively formed. In the present specification, the `` fragile part '' refers to a part having a fragility that deforms when an impact load of a predetermined size or more is applied, such as at the time of a rear collision, a hole part, It is formed by a recess or the like.

In the present embodiment, the fragile portions 33a and 33a are respectively formed on the rear side support brackets 33A and 33A disposed on both the left and right sides. To do. The same applies to the fragile portions 33b and 33b.
Moreover, in this embodiment, the weak parts 33a and 33a are formed in the position which becomes the same height on the basis of a horizontal surface (vehicle body floor). If comprised in this way, the deformation | transformation position control of back side support bracket 33A, 33A when an impact load is added will become easy, and it can apply to a vehicle seat suitably.
However, the present invention is not limited to this, and can be formed at any position as long as it is formed on the rear support brackets 33A and 33A without departing from the spirit of the present invention.
Similarly, the fragile portions 33b and 33b are formed at the same height with respect to the horizontal plane (vehicle body floor). However, if they are formed on the front support brackets 33B and 33B, the gist of the present invention is achieved. It can be formed at any position without departing from the scope.

(About the weak part 33a and the control part 40 which were formed in 33 A of back side support brackets)
As described above, the fragile portion 33a is formed on the rear-side support bracket 33A, and this formation position is a position on the side that becomes the rear side of the vehicle when the rail mechanism 3 is attached to the vehicle floor.
As shown in FIG. 4, the rear support bracket 33 </ b> A is attached to the lower surface of the lower rail 31 on the vehicle rear side. At this time, the rear support bracket 33A is attached with its orientation aligned so that the rear vehicle attachment portion 133d is disposed on the vehicle rear side.
This attachment is performed by aligning the bolt hole H1 formed in the rear rail attachment portion 133c with the bolt hole formed in the lower rail 31 (not shown), and fastening the bolt V1 from below.
And the weak part 33a is formed in the rear side bracket inclination part 133e.

For the sake of explanation, the surface of the rear bracket inclined portion 133e facing the vehicle rear side is referred to as “bracket front surface D1”, and rib walls that respectively hang downward substantially vertically from both side edges in the vehicle width direction of the bracket front surface D1. It is described as “bracket rib wall D2”.
The fragile portion 33a according to the present embodiment is formed in a substantially linear shape in a substantially horizontal direction with respect to the vehicle floor, and has a cutout portion K1 cut out so as to divide the bracket front surface D1 in the vertical direction, and a substantially elliptic shape in the bracket rib wall D2. A deformation hole K2 that is formed in a shape and communicates with the notch K1 is formed.

In the present embodiment, the deformation hole portion K2 is bored so that the long axis thereof is along the inclined line of the bracket front surface D1, and the vehicle width direction end of the cut portion K1 in the peripheral portion of the deformation hole portion K2 It is comprised so that it may connect with the notch part K1 from the part close | similar to a part.
In the present embodiment, the deformed hole portion K2 is formed on both the bracket rib walls D2 depending on both sides.
Thus, since the deformation | transformation hole part K2 is formed, when the impact load is added, the weak part 33a becomes easy to deform | transform and can absorb impact energy more effectively.

In addition, this weak part 33a may be comprised as a groove | channel formed in the said part of the rear side bracket inclination part 133e. Such a groove may be formed by crushing the portion, or the structure as described above may be formed by performing press working or the like on the rear bracket inclined portion 133e itself.
Further, the shape of the deformation hole portion K2 is not limited to this, and may be formed in any shape as long as it does not deviate from the function of the present invention and the deformation hole portion K2.

The fragile portion 33a can be bent when a predetermined impact load (a large impact load at the time of normal seating or more) is applied to the seat back frame 1 or the seating frame 2 such as a rear collision, for example, As shown in FIG. 8, it deform | transforms so that it may collapse in an up-down direction. As a result, the rearward load can be stably and efficiently absorbed. Further, since the fragile portion 33a extends along the vehicle width direction, even when a load in the left-right direction is applied, it is possible to receive the load at the ridge line portion, and the load in the seat width direction The rigidity with respect to can be improved.

When the occupant suddenly moves backward, such as at the time of a rear collision, the fragile portion 33a is crushed in the vertical direction by receiving the impact load. As described above, when the fragile portion 33a is crushed, the rear bracket inclined portion 133e has its upper portion (specifically, the portion above the portion where the fragile portion 33a is formed) bent toward the rear of the vehicle. The rear side support bracket 33A tilts backward with this deformation. In addition, in order to make the weak part 33a easy to deform | transform, if it has the intensity | strength which can bear a normal seating load, you may form only the plate | board thickness of the part which comprises the weak part 33a thinly.

Further, as shown in FIGS. 6 and 7, the rear bracket inclined portion 133e provided with the fragile portion 33a described above is further provided with a restricting portion 40 (first restricting portion) facing the fragile portion 33a. 41, a second restricting portion 42). The restricting portions 40 (the first restricting portion 41 and the second restricting portion 42) face each other so as to sandwich the fragile portion 33a, and are attached to the rear bracket inclined portion 133e by means of welding or the like. Provided above and below the portion 33a.

When an impact load such as a rear collision is applied to the seat back frame 1 and the seating frame 2, the fragile portion 33a is crushed in the vertical direction above the rear bracket inclined portion 133e (specifically, the fragile portion 33a is As shown in FIG. 8, the restricting portion 40 has an amount by which the fragile portion 33a is crushed (that is, the rear inclination angle of the rear bracket inclined portion 133e). It is provided to regulate so as not to become larger than a certain value.

In other words, the pair of restricting portions 40 provided to face each other via the fragile portion 33a, when the bending of the fragile portion 33a provided in the rear bracket inclined portion 133e becomes large, the restricting portions 40 (first restricting portion 41). , The second restricting portion 42) comes into contact, and the second restricting portion 42 provided below is disposed so as to hold down the first restricting portion 41 provided above.

The restricting portion 40 includes a first restricting portion 41 and a second restricting portion 42 each having restricting surfaces 41a and 42a that are disposed to face each other at a position sandwiching the fragile portion 33a. In other words, the first restricting portion 41 and the second restricting portion 42 are in contact with the restricting portion 40 (the first restricting portion 41 or the second restricting portion 42) disposed to face each other, and the weak portion Restriction surfaces 41a and 42a are provided to restrict the bending of 33a so as not to bend more than a certain amount. Therefore, for example, as shown in FIG. 7, the first restricting portion 41 and the second restricting portion 42 may be members having a substantially trapezoidal cross section. Since the restricting surfaces 41a and 42a have larger areas, the restricting portions 40 (the first restricting portion 41 and the second restricting portion 42) are more likely to come into contact with each other when the fragile portion 33a is bent. And the deformation amount (backward tilt amount) of the seating frame 2 can be regulated.

In this way, the restriction portion 40 composed of the first restriction portion 41 and the second restriction portion 42 arranged to face each other in the vertical direction serves as two opposed portions formed at a position sandwiching the fragile portion 33a. Restricting surfaces 41a and 42a are provided. The distance between the two restricting surfaces 41a and 42a is smaller than the width in the height direction of the fragile portion 33a (that is, the width in the direction sandwiched between the first restricting portion 41 and the second restricting portion 42). Is formed.

Specifically, the lower end portion (that is, the restriction surface 41a) of the first restricting portion 41 provided above is disposed below the upper end portion of the fragile portion 33a. On the other hand, the upper end portion (that is, the restriction surface 42a) of the restriction portion 40 provided below is disposed above or substantially at the same height as the lower end portion of the fragile portion 33a. In addition, in FIG. 7, the control surface 42a of the control part 40 with which the downward direction is shown in the state arrange | positioned in the substantially same height as the lower end part of the weak part 33a.

In other words, the distance between the pair of opposing restricting portions 40 (the first restricting portion 41 and the second restricting portion 42) is smaller than the width in the direction in which the pair of restricting portions 40 of the fragile portion 33a are arranged side by side. Has been. In other words, in FIG. 7, the distance α between the opposing regulating surfaces 41a and 42a and the vertical width β of the fragile portion 33a are formed such that α <β.

By adopting such a configuration, when the fragile portion 33a is bent in the vertical direction, as shown in FIG. 8, the restricting portions 40 arranged in the vertical direction of the fragile portion 33a (the first restricting portion 41, the first restricting portion 41). The second restricting portion 42) can easily come into contact, and the deformation of the fragile portion 33a can be stopped at a certain position.

In the present embodiment, an example in which planar regulation surfaces 41a and 42a are formed in both the first regulation unit 41 and the second regulation unit 42 is illustrated, but at least one of the regulation surfaces 41a is illustrated. (Or the regulating surface 42a) may be formed in a flat shape.
That is, the restriction surface 41a (or the restriction surface 42a) provided on at least one of the first restriction portion 41 and the second restriction portion 42 is formed in a planar shape.

Thus, when the fragile portion 33a is bent by making at least one of the restriction surfaces 41a (or the restriction surface 42a) out of the first restriction portion 41 or the second restriction portion 42 into a flat shape, the restriction portion. It becomes easy for 40 (1st control part 41, 2nd control part 42) to contact. As a result, the bending amount of the fragile portion 33a is limited, and the deformation amount of the rear bracket inclined portion 133e does not become larger than the specified value.

As shown in FIG. 8, the restricting portion 40 including the restricting surfaces 41 a and 42 a formed in a flat shape deforms the fragile portion 33 a when an impact load is applied, and the first restricting portion 41 serves as the second restricting portion. When abutting on the portion 42, the first restricting portion 41 is formed so as to abut on a regulating surface 42a formed in a flat shape. That is, when the fragile portion 33a is deformed, the restricting surface 42a of the second restricting portion 42 with which the first restricting portion 41 abuts is at least the rear side of the first restricting portion 41 (that is, the fragile portion 33a is formed. It extends further to the rear (on the opposite side to the fragile portion 33a) than the edge on the opposite side. By adopting such a configuration, the first restricting portion 41 firmly contacts the restricting surface 42a formed in a flat shape, so that the first restricting portion 41 is against the second restricting portion 42. The slippage and displacement are suppressed, and the deformation of the fragile portion 33a can be suppressed more stably.

In order to achieve the above configuration, for example, in the state (normal state) before the impact energy is applied, the rear side edge end portion of the restriction surface 42a of the second restriction portion 42 is used as the restriction surface of the first restriction portion 41. It is good to be formed so that it may become back (the opposite side to the weak part 33a) rather than the rear edge part of 41a.

As shown in FIGS. 7 and 8, it is preferable that the restricting portion 40 has a hollow configuration because the vehicle seat S can be reduced in weight, but sufficient strength of the restricting portion 40 is ensured. Therefore, it may be solid. Further, for the purpose of weight reduction, holes may be provided in each of the regulation surfaces 41a and 42a as shown in FIG.

(Operational effect of rear bracket inclined portion 133e)
The manner in which the rear bracket inclined portion 133e is deformed when an impact load at the time of rear collision is applied will be described below with reference to FIGS.
FIG. 7 shows a normal state, and FIG. 8 shows a state of deformation when an impact load at the time of a rear collision is applied to the rear bracket inclined portion 133e. At the time of a rear collision, a load in a backward tilting direction is mainly applied to the seating frame 2.

As shown in FIG. 8, when a load is transmitted to the rear bracket inclined portion 133e constituting the rear support bracket 33A, the fragile portion 33a formed in the rear bracket inclined portion 133e is crushed in the vertical direction. As a result, the upper part of the rear bracket inclined part 133e (specifically, the upper part from the formation position of the fragile part 33a) is inclined rearward, and the rear bracket inclined part 133e is deformed.

That is, when an impact load toward the rear is applied, the upper part of the rear bracket inclined part 133e bends rearward, and the upper part of the rear bracket inclined part 133e sinks (the weak part is formed in the support bracket inclined part 133e). Therefore, the upper part of the rear bracket inclined part 133e that is bent from this part and receives a load from the rear part of the seating frame 2 toward the rear of the vehicle sinks toward the rear side), and the rear side of the seating frame 2 is also on the rear side. Sink into. Accordingly, the seat back frame 1 also tilts backward.
Therefore, when an impact load is applied, the occupant's body can be efficiently left to the seat back frame 1.

When the fragile portion 33a is bent as described above, the amount of bending of the fragile portion 33a is restricted by the restricting portion 40 provided in the rear bracket inclined portion 133e. That is, when an impact load at the time of rear collision is applied, the fragile portion 33a is bent so as to be crushed in the vertical direction, and the rear bracket inclined portion 133e (and the seating frame 2 and the seat back frame 1) is inclined backward. However, when the fragile portion 33a is bent to a certain range, the pair of restricting portions 40 come into contact with each other, and the amount of bending of the fragile portion 33a is restricted. Therefore, by providing the restricting portion 40, it is possible to restrict the deformation amount of the rear side support bracket 33A from becoming too large, and accordingly, the amount of backward inclination of the seat back frame 1 does not become too large. The backward tilt amount can be set to an appropriate size.

Furthermore, by providing the pressure receiving member 20 connected to the moving member 50, the vehicle seat S can sufficiently sink the occupant into the seat back S1 at the time of a rear collision.
Therefore, the pressure receiving member 20 can sink the occupant's body relative to the side frame 15 and the upper frame 16, and can efficiently transmit and absorb the impact energy due to the rear collision or the like to the seat back 1. .
As a result, the occupant's load is further left behind the vehicle, and the fragile portion 33a formed in the rear bracket inclined portion 133e is deformed via the seating frame 2, so that the impact energy can be absorbed more efficiently.

Moreover, in this embodiment, it was set as the structure which fixes 33 A of back side support brackets to the lower rail 31 with the volt | bolt V1.
Therefore, after the rear side support bracket 33A is deformed after the collision, it is easy to replace it.
For this reason, maintenance costs are reduced.
Furthermore, the floor shape is often different for different vehicle types. In this case, the shape of the rear side support bracket 33A is also different, but since the rear side support bracket 33A is fixed to the lower rail 31 by the bolt V1, it is different for each vehicle type. The rear-side support bracket 33A having a different shape can be simply applied.
That is, it is only necessary to fix the rear side support bracket 33A suitable for each vehicle type to the lower rail 31 with the bolt V1, and thus the versatility is increased and the cost can be reduced.

(About the weak part 33b and the regulation part 540 formed in the front side support bracket 33B)
As described above, the fragile portion 33b is formed on the front side support bracket 33B, and this formation position is a position that becomes the front side of the vehicle when the rail mechanism 3 is attached to the vehicle floor.
As shown in FIG. 4, the front side support bracket 33 </ b> B is attached to the lower surface of the lower rail 31 on the vehicle front side. At this time, the front side support bracket 33B is attached with its orientation aligned so that the front vehicle attachment portion 133b is disposed on the vehicle front side.
This attachment is performed by aligning a bolt hole (not shown) formed on the top surface of the front rail attachment portion 133a with a bolt hole formed in the lower rail 31 (not shown), and fastening a bolt or the like from below. By doing.
And the weak part 33b is formed in the front side vehicle attachment part 133b.

As shown in FIG. 4, the fragile portion 33 b is formed as a long groove that protrudes toward the rear of the vehicle on the surface of the front vehicle mounting portion 133 b that faces the front of the vehicle.
And the restriction | limiting part 540 is formed as a projecting edge which protrudes in the vehicle back from the surface which faces the vehicle back of the front side vehicle attachment part 133b.
At this time, the restricting portion 540 (the first restricting portion 541 and the second restricting portion 542) is rearward of the vehicle so as to face the vehicle rear side of the front vehicle attachment portion 133b via the fragile portion 33b. Protrusively toward.
That is, the restricting portion 540 (the first restricting portion 541 and the second restricting portion 542) are opposed to each other with the fragile portion 33b interposed therebetween, and a means such as welding (integral formation) is formed on the vehicle rear side surface of the front vehicle attachment portion 133b. Or may be provided at the top and bottom of the fragile portion 33b.

The fragile portion 33b can bend and spread when a predetermined impact load (a large impact load more than that during normal seating) is applied to the seat back frame 1 or the seating frame 2 such as a rear collision. Transforms into
That is, when the occupant suddenly moves backward, such as during a rear collision, the front support bracket 33B is crushed with the fragile portion 33b as a fulcrum by receiving the impact load.
At this time, the front rail mounting portion 133a is pulled toward the lower rear portion of the vehicle, and as a result, the fragile portion 33b is deformed so as to expand, and the front support bracket 33B is crushed in the vertical direction with the fragile portion 33b as a fulcrum. Tilt.
In addition, in order to make the weak part 33b easy to deform | transform, if it has the intensity | strength which can endure a normal seating load, you may form only the plate | board thickness of the part which comprises the weak part 33b thinly.

Further, when an impact load such as a rear collision is applied to the seat back frame 1 and the seating frame 2, above the front support bracket 33B (specifically, above the portion where the fragile portion 33b is formed). However, the restricting portion 540 is provided to restrict the deformation amount of the fragile portion 33b from becoming larger than a certain value.

That is, when the deformation (expansion) of the fragile portion 33b increases, the pair of restricting portions 540 provided to face each other via the fragile portion 33b increases between the restricting portions 540 (the first restricting portion 541 and the second restricting portion 542). ) Are in contact with each other, and the second restricting portion 542 provided below is disposed so as to press down the first restricting portion 541 provided above.

The restricting portion 540 includes a first restricting portion 541 and a second restricting surface 541a and 542a that are respectively provided facing the positions sandwiching the fragile portion 33b on the front vehicle mounting portion 133b facing the front of the vehicle. A restriction portion 542 is provided. That is, the first restricting portion 541 and the second restricting portion 542 are in contact with the restricting portion 540 (the first restricting portion 541 or the second restricting portion 542) disposed to face each other, and the weak portion Restriction surfaces 541a and 542a are provided for restricting the bending of the fixed amount 33b so as not to bend more than a certain amount.
In addition, since the effect of the weak part 33b and the control part 540, the effect of the front side support bracket 33B, etc. are the same as that of the above-mentioned back side support bracket 33A, the weak part 33a, and the control part 40, description is abbreviate | omitted. .

<< Other Embodiments >>
The example in which the restricting portion 40 is fixedly joined to the rear bracket inclined portion 133e and attached is shown. However, as another embodiment of the restricting portion, the restricting portion 140 is formed integrally with the rear bracket inclined portion 133e. It is good also as the structure which carried out. The restricting portion 140 may be formed so as to protrude rearward from the rear bracket inclined portion 133e.

The restricting portion 140 formed integrally with the rear bracket inclined portion 133e, like the restricting portion 40, is a first restricting portion 141 and a second restricting portion 141 having opposing portions facing each other, that is, restricting surfaces 141a and 142a, respectively. The restricting portion 142 is configured. In addition, since the effect of the control part 140 is the same as that of the said control part 40, the description is abbreviate | omitted.
In this way, by forming the restricting portion 140 integrally with the upper frame 16, not only the number of parts can be reduced, but also work such as welding does not need to be performed, so that the work process can be shortened.

(Second Embodiment)
As yet another embodiment, as shown in FIG. 9, the restricting portion 240 includes a first restricting portion 241 and a second restricting portion 242 that are integrally formed, and then attached to the rear bracket inclined portion 133 e. A configuration may be adopted. In the restricting portion 240, the first restricting portion 241 and the second restricting portion 242 are continuously formed in the vertical direction, and a concave portion or a hole having the same shape as this is formed at the position of the fragile portion 33a. An opening 240a is formed. Therefore, when the impact load is applied to the seat back frame 1 and the seating frame 2 by forming the opening 240a in the restricting portion 240, the restricting portion 240 does not hinder the deformation of the fragile portion 33a. .

Further, by integrally forming the first restricting portion 241 and the second restricting portion 242 arranged in parallel in the vertical direction, the dimension of the opening 240a, that is, the distance between the restricting surfaces 241a and 242a is set with high accuracy. can do. Moreover, since the fastening (joining) location can be reduced when attaching the restricting portion 240 to the rear bracket inclined portion 133e, the cost for the manufacturing process can be reduced.

(Third embodiment)
As still another embodiment, a fastening part 341b is formed by separately forming the first restricting part 341 and the second restricting part 342 as in the restricting part 340 shown in FIG. , 342b may be formed. The fastening portions 341b and 342b are extended from the portion where the regulation surfaces 341a and 342a are not formed toward the inside and the upper side of the seat, respectively, and have a flat plate shape so as to follow the surface shape of the rear bracket inclined portion 133e. Is formed.

Further, holes are formed in the fastening portions 341b and 342b so that fastening means can be inserted. By making this hole a long hole, positioning can be facilitated when attaching the first restricting portion 341 and the second restricting portion 342.

In this way, by providing the first restricting portion 341 and the second restricting portion 342 with the fastening portions 341b and 342b, when attaching to the rear bracket inclined portion 133e, a fastening means such as a bolt-nut is used. Then, the restricting portion 340 can be attached.

In this way, instead of attaching the restricting portion 340 using means such as welding, the vehicle seat S is provided with the fastening portions 341b and 342b and attached to the rear bracket inclined portion 133e by the fastening means. The restricting portion 340 can be optionally removed in accordance with the design. Further, by forming the fastening portions 341b and 342b respectively as the first restricting portion 341 and the second restricting portion 342, the rigidity of the first restricting portion 341 and the second restricting portion 342 can be improved. .

(Fourth embodiment)
As still another embodiment, the width of the restriction surface 441a provided in the first restriction portion 441 and the second restriction portion 442 is different from the width of the restriction surface 442a as in the restriction portion 440 shown in FIG. It may be formed. In each of the above embodiments, the configuration in which the widths in the left and right directions of the first restricting portion and the second restricting portion provided on the upper and lower sides are equal to each other is illustrated. In particular, the width in the left-right direction of the restriction surface of the restriction portion disposed below may be formed large.

The width in the left-right direction (length indicated by a in FIG. 11) of the restriction surface 441a of the first restriction portion 441 is the width in the left-right direction (length indicated by b in FIG. 11) of the restriction surface 442a of the second restriction portion 442. And so on). At this time, the width of the restricting surface 442a of the second restricting portion 442 disposed below is formed larger. That is, a <b.

As described above, when one of the first restricting portion 441 and the second restricting portion 442 constituting the restricting portion 440 is formed wider than the other, when an impact load is applied, for example, the rear bracket 33A. Even if the torsional deformation occurs, the first restricting portion 441 and the second restricting portion 442 are likely to contact each other. That is, by forming one wide, even when the rear bracket 33A is tilted backward so as to be twisted due to a complicated input load, the first restricting portion 441 and the second restricting portion 441 are arranged. Since the part 442 contacts, the deformation amount of the rear side bracket 33A can be controlled.

Also, when attaching the restricting portion 440 to the rear bracket inclined portion 133e by welding work or the like, it is not necessary to strictly define the attachment position by making one of the wide shapes. For example, even when the attachment position of the second restricting portion 442 is slightly shifted in the left-right direction with respect to the first restricting portion 441, the second restricting portion 442 is formed to be wide. When the side bracket inclined portion 133e is tilted backward, the first restricting portion 441 can be brought into contact with the second restricting portion 442. As a result, it is not necessary to perform exact positioning at the time of attaching the restricting portion 440, so that workability is improved.

In this way, by forming the first restricting portion 441 and the second restricting portion 442 with different widths, the amount of backward tilt can be controlled even when a complicated input load is applied and torsionally deformed. It becomes easy.

(Fifth embodiment)
The fifth embodiment will be described with reference to FIGS.
In addition, 5th Embodiment is an example in which the shape of the weak part 33a formed in 33 A of back side support brackets in the said embodiment was changed.
In the present embodiment, the configurations corresponding to the “rear support bracket 33A” and the “fragile portion 33a” are referred to as the “second rear support bracket 330A” and the “second weak portion 330a”, respectively. The description of the same configuration as in FIG.

A second fragile portion 330a is formed in the second rear support bracket 330A according to the present embodiment.
In the present embodiment, the second fragile portion 330a is formed as a groove extending in the vehicle width direction.
That is, the second fragile portion 330a is formed on the bracket front surface D1, which is a surface facing the vehicle rear side of the rear bracket inclined portion 133e, so as to extend along the vehicle width direction as a long groove protruding toward the vehicle front. Has been.
At this time, the end of the second fragile portion 330a extends to each boundary portion (bending corner portion) between the bracket front surface D1 and the bracket rib walls D2 and D2, and accordingly, the second fragile portion 330a when a load is applied. It becomes easy to deform.

(Sixth embodiment)
The sixth embodiment will be described with reference to FIGS. 14 and 15.
The sixth embodiment is also an example in which the shape of the fragile portion 33a formed in the rear side support bracket 33A is modified in the first embodiment.
In the present embodiment, the configurations corresponding to the “rear support bracket 33A” and the “fragile portion 33a” are referred to as the “third rear support bracket 430A” and the “third weak portion 430a”, respectively. The description of the same configuration as in FIG.

A third fragile portion 430a is formed in the third rear support bracket 430A according to the present embodiment.
The third fragile portion 430a includes a third fragile portion groove portion J1a and two third fragile portion hole portions J1b and J1b.
The third fragile portion groove portion J1a is formed as a groove extending in the vehicle width direction.
That is, the third fragile portion groove portion J1a extends along the vehicle width direction as a long groove that protrudes toward the front of the vehicle on the bracket front surface D1 that is a surface facing the vehicle rear side of the rear bracket inclined portion 133e. Is formed.
However, unlike the above-described fifth embodiment, the end of the third fragile portion 430a does not extend to each boundary portion (bending corner portion) between the bracket front surface D1 and the bracket rib walls D2 and D2, Fourth weak hole holes J1b and J1b are respectively formed at the contact points between both ends of the third weak groove groove J1a and each boundary portion (bending corner) between the bracket front surface D1 and the bracket rib walls D2 and D2. ing.

In other words, at each boundary portion (bending corner portion) between the bracket front surface D1 and the bracket rib walls D2 and D2, the third weakened hole portions J1b and J1b are symmetrical with respect to the midline N of the bracket front surface D1. The third fragile portion groove portion J1a is formed so as to extend over both the third fragile portion hole portions J1b and J1b (see particularly FIG. 15).
That is, the third weakened portion hole portions J1b and J1b are formed at the boundary portion between the bracket front surface D1 and the bracket rib walls D2 and D2, and both end portions in the vehicle width direction of the third weakened portion groove portion J1a are both It will be continuing with the 3rd weak part hole J1b and J1b.
Each boundary portion (bent corner portion) between the bracket front surface D1 and the bracket rib walls D2 and D2 is high in strength, but since the third weakened portion hole portions J1b and J1b are formed in this portion in this way, The deformation of the three fragile portions 430a becomes easier.

(Seventh embodiment)
The seventh embodiment will be described with reference to FIGS. 16 and 17.
The seventh embodiment is also an example in which the shape of the fragile portion 33a formed on the rear side support bracket 33A is modified in the first embodiment.
In the present embodiment, the configurations corresponding to the “rear support bracket 33A” and the “fragile portion 33a” are referred to as the “fourth rear support bracket 530A” and the “fourth weak portion 530a”, respectively. The description of the same configuration as in FIG.

A fourth fragile portion 530a is formed in the fourth rear support bracket 530A according to the present embodiment.
The fourth fragile portion 530a includes a fourth fragile portion groove portion J2a, two fourth fragile portion hole portions J2b, J2b, and two fourth fragile portion protrusion portions J2c, J2c.
In addition, in this example, although it comprised with having two 4th weak part protrusion parts J2c and J2c, this may be comprised as a recessed part.
That is, although it may be configured as the fourth fragile portion recess J2c, it is more preferable to form it as a protrusion from the viewpoint of ease of deformation.

The fourth fragile portion groove portion J2a is formed as a groove extending in the vehicle width direction.
That is, the fourth fragile portion groove portion J2a extends along the vehicle width direction as a long groove that protrudes toward the front of the vehicle on the bracket front surface D1, which is a surface facing the vehicle rear side of the rear bracket inclined portion 133e. Is formed.
The ends of the fourth fragile portion 530a do not extend to the respective boundary portions (bending corner portions) between the bracket front surface D1 and the bracket rib walls D2 and D2, and both ends of the fourth fragile portion groove portion J2a and the bracket Fourth weak hole holes J2b and J2b are formed at the contact points between the front surface D1 and the boundary portions (bending corner portions) between the bracket rib walls D2 and D2, respectively.

In other words, at each boundary portion (bending corner portion) between the bracket front surface D1 and the bracket rib walls D2 and D2, the fourth fragile portion hole portions J2b and J2b are symmetrical with respect to the midline N of the bracket front surface D1. The fourth fragile portion groove portion J2a is formed so as to extend over both the fourth fragile portion hole portions J2b and J2b (see particularly FIG. 17).
That is, the fourth weakened portion hole portions J2b and J2b are formed at the boundary portion between the bracket front surface D1 and the bracket rib walls D2 and D2, and both ends in the vehicle width direction of the fourth weakened portion groove portion J2a are both It will be continuing with the 4th weak part hole J2b and J2b.

Moreover, the 4th weak part protrusion part J2c, J2c is formed so that it may each extend toward the edge side of bracket rib wall D2, D2 from these 4th weak part hole J2b, J2b.
In other words, the 4th weak part protrusion part J2c, J2c is a dome-shaped protruding edge formed so that it may become convex outside, and bracket rib wall D2, D2 from the 4th weak part hole part J2b, J2b. It is comprised so that it may extend toward the edge of each. As described above, the fourth fragile portion protrusions J2c, J2c may be formed to be concave outward (that is, may be configured as the fourth fragile portion concave portion J2c).

As described above, since the third weakened portion holes J1b and J1b are formed in the high-strength portions such as the boundary portions (bending corner portions) between the bracket front surface D1 and the bracket rib walls D2 and D2, The deformation of the fourth fragile portion 530a is further facilitated, and the deformation of the fourth fragile portion 530a is further facilitated when a load is applied due to the added fourth fragile portion protrusions J2c and J2c.

In each of the above embodiments, as a specific example, the case of a rear collision has been described. However, the configuration of the present invention is not limited to the case of a rear collision, for example, as a configuration for absorbing impact energy at the time of a side collision. Is also applicable. Moreover, although the front seat of the automobile has been described, it is needless to say that the same configuration can be applied to the seat of the rear seat without being limited thereto.
Further, as in the present embodiment, not only the fragile portion 33a and the restricting portion 40 are provided in the rear support bracket 33A, but the same configuration may be provided on the seat back frame 1 side.
For example, the fragile portion 33a extending in the vehicle width direction of the upper frame 16 and the restricting portion 40 may be provided so as to sandwich the fragile portion 33a, or the base end portion of the side frame 15 may have a similar configuration.
By further comprising such a configuration, impact energy can be absorbed more effectively.
Furthermore, in this embodiment, although it was set as the structure which attaches the support bracket 33 to the rail mechanism 3 as a specific example, it is not restricted to this.
That is, the support bracket 33 may function as a member having a configuration for attaching the vehicle seat S to the vehicle body floor, and the attachment location and the attachment method for the vehicle seat S are not limited to the present embodiment.

S Vehicle seat S1 Seat back S2 Seating portion S3 Headrest F Seat frame 1 Seat back frame P1, P2, P3 Cushion pads L1, L2, L3 Skin material 11 Reclining mechanism 11a Reclining shaft 11c Shaft insertion hole 15 Side frame 15a Side plate 15b Front Edge 15c Rear edge 15d Protrusion 15e Protrusion 16 Upper frame 16A Upper frame upright portion 16B Pillar mounting portion 17c Shaft through hole 18 Lower frame installation portion 19 Headrest pillar 19a Pillar support portion 20 Pressure receiving member 21 Wire 21a Shaft support portion 22 Wire 50 Moving member 52 Shaft portion 55 Tension coil spring 59 Movement preventing portion 2 Seating frame 2a Seating side frame 2b Rear side connecting pipe 2c Front side connecting pipe 2d S spring 3 Rail mechanism 3 Lower rail 32 Upper rail 33 Support bracket 33A Rear support bracket 133c Rear rail attachment portion 133d Rear vehicle attachment portion 133e Rear bracket inclined portion D1 Bracket front D2 Bracket rib wall 33a Fragile portion K1 Cut portion K2 Deformation hole portion 33B Front support Bracket 133a Front rail attachment portion 133b Front vehicle attachment portion 33b Fragile portion 330A Second rear support bracket 330a Second weak portion (groove)
430A 3rd back side support bracket 430a 3rd weak part J1a 3rd weak part groove part (groove)
J1b 3rd weak part hole (hole)
530A 4th back side support bracket 530a 4th weak part J2a 4th weak part groove part (groove)
J2b 4th weak part hole (hole)
J2c 4th weak part protrusion part 34 Slide lever 35 Mounting bracket 38 Bolt 40,140,240,340,440,540 Restriction part 240a Opening part 41,141,241,341,441,541 First restriction part 41a, 141a , 241a, 341a, 441a, 541a Restricting surface (first facing portion)
341b Fastening portion 42, 142, 242, 342, 442, 542 Second restricting portion 42a, 142a, 242a, 342a, 442a, 542a Restricting surface (second facing portion)
342b Fastening part H1 Bolt hole V1 Bolt

Claims (17)

1. The seating frame is connected to the vehicle floor, and at least one of the vehicle front side and the vehicle rear side of the support bracket that supports the load from the seating frame,
   A vehicular seat comprising a fragile portion that deforms when an impact load is applied.
2. 2. The vehicle seat according to claim 1, wherein the support bracket further includes a restricting portion that is disposed at a position sandwiching a portion of the fragile portion and restricts a deformation amount of the fragile portion.
3. The restricting portion includes two opposing portions formed at positions sandwiching the fragile portion,
   The vehicle seat according to claim 2, wherein a distance between the two facing portions is formed to be smaller than a width of the weak portion in a direction sandwiched between the restricting portions.
4. The support bracket is further provided with a restricting portion that is disposed at a position sandwiching a portion of the fragile portion and restricts the deformation amount of the fragile portion,
   The support bracket is disposed on the vehicle front side of the seat and supports a load applied to the front side of the seating frame, and is disposed on the vehicle rear side of the seat and rear of the seating frame. A rear side support bracket for supporting a load applied to the side,
   The fragile portion is disposed on a surface of the front support bracket facing the vehicle front side, and the restricting portion protrudes from the surface of the front support bracket facing the vehicle rear side toward the vehicle rear side. The vehicular seat according to any one of claims 1 to 3, wherein the vehicular seat is formed as described above.
5. The fragile portion is formed as a long hole that divides a surface facing the vehicle front side of the front support bracket in the vehicle width direction or a groove formed to be convex toward the vehicle rear side. Item 5. The vehicle seat according to Item 4.
6. The support bracket is further provided with a restricting portion that is disposed at a position sandwiching a portion of the fragile portion and restricts the deformation amount of the fragile portion,
   The support bracket is disposed on the vehicle front side of the seat and supports a load applied to the front side of the seating frame, and is disposed on the vehicle rear side of the seat and rear of the seating frame. A rear side support bracket for supporting a load applied to the side,
   The vehicle seat according to any one of claims 1 to 3, wherein the fragile portion and the restricting portion are disposed on a surface of the rear support bracket facing the vehicle rear side.
7. A bracket rib wall that is bent downward from both sides in the vehicle width direction and hangs down is provided on the bracket front surface facing the vehicle rear side of the rear support bracket,
   The fragile portion is a notch formed as a groove or hole that divides the bracket front surface along the vehicle width direction, and a deformation hole that is a hole formed in the bracket rib wall so as to be continuous with the notch. And the vehicle seat according to claim 6.
   
8. A bracket rib wall that is bent downward from both sides in the vehicle width direction and hangs down is provided on the bracket front surface facing the vehicle rear side of the rear support bracket,
   The fragile portion is a groove that divides the front of the bracket along the vehicle width direction,
   The vehicle seat according to claim 6, wherein the groove extends to a boundary portion between the bracket front surface and the bracket rib wall.
9. A hole is formed in a boundary portion between the bracket front surface and the bracket rib wall,
   The vehicle seat according to claim 8, wherein an end of the groove in the vehicle width direction is continuous with the hole.
10. The vehicle seat according to claim 9, wherein the bracket rib wall is formed with a protrusion or a recess that is continuous with the hole.
11. 11. The vehicle seat according to claim 9, wherein a protrusion that is continuous with the hole is formed on the bracket rib wall.
12. The support brackets are provided on both sides of the seating frame in the vehicle width direction, and the support brackets are disposed on the vehicle front side of the seat and support a load applied to the front side of the seating frame. A support bracket and a rear support bracket that is disposed on the vehicle rear side of the seat and supports a load applied to the rear side of the seating frame;
    Each of the weakened portions provided on both sides in the vehicle width direction has the same height from the vehicle floor on a surface facing the vehicle rear side of the rear support bracket or a surface facing the vehicle front side of the front support bracket. The vehicle seat according to any one of claims 1 to 11, wherein the vehicle seat is formed along a vehicle width direction at a position where
13. The restricting portion is formed at a position sandwiching the fragile portion in the vertical direction,
    The first facing portion constituting the first restricting portion disposed above the fragile portion and the second facing portion constituting the second restricting portion disposed below the fragile portion are: It is arranged so as to oppose the weak part,
    At least a part of the first facing part and at least a part of the second facing part come into contact with each other when the deformation amount of the side component member reaches a predetermined amount, and the deformation amount of the side component member The vehicular seat according to any one of claims 1 to 12, wherein the vehicular seat is configured to regulate the vehicle.
14. The fragile portion is formed as a recess or hole formed in a groove shape, and the distance between the first facing portion and the second facing portion is the opening of the recess or the hole. The vehicle seat according to claim 13, wherein the vehicle seat is configured to be smaller than a width of a position aligned with a position sandwiched between the first facing surface and the second facing surface.
15. The first opposing surface and the second opposing surface have a lateral distance on one side that transmits an acting force that induces the deformation to the other when the side structural member is deformed. 15. The vehicle according to claim 13 or 14, wherein when the member is deformed, the member is configured to be smaller than a horizontal distance on a side to which the acting force that induces the deformation is transmitted. Sheet.
16. 14. The first restricting portion and the second restricting portion are integrally formed by being connected in a state where the first facing surface and the second facing surface face each other. The vehicle seat according to claim 15.
17. The at least one fastening part extended to the outside is formed in the 1st regulation part and the 2nd regulation part, The above-mentioned any one of Claims 13 thru / or 16 characterized by things. Vehicle seat.

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