JP6284206B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat, and more particularly to a vehicle seat capable of efficiently absorbing impact energy at the time of a rear collision and a side collision.

  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 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 impact load applied to the occupant during rearward movement.

  On the other hand, a technique for attaching a side airbag to the side surface of a seat back has also been proposed in order to relieve an impact load caused not only by a rear collision but also from a side collision (for example, Patent Document 2).

Japanese Patent No. 4200580 JP 2008-114638 A

  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. Therefore, since the bending point cannot be limited, the impact energy is transmitted to the entire seatback frame, the impact energy absorption efficiency is lowered, and it is difficult to stably reduce the impact energy.

  In addition, in the seat disclosed in Patent Document 1, when a side airbag is attached to the side surface of the seat back in order to cope with the impact load of the side collision, the seat back frame is moved to the side airbag (bag case) at the time of the rear collision. ), It is difficult to bend, and the impact energy cannot be absorbed sufficiently.

  Therefore, the present applicant relates to a technique for absorbing impact energy by deforming a seat back frame, and by forming a flexible weak portion (narrow portion deformed by impact load) in a lower portion of the seat back frame. In addition, a technology has been proposed in which the fragile portion is bent preferentially when impact energy is applied, such as during a rear collision, and the impact energy is efficiently absorbed (Japanese Patent Application No. 2010-273867). Thus, it becomes possible to absorb impact energy efficiently by limiting the deformation | transformation location of a seat back frame.

In the above technology (Japanese Patent Application No. 2010-273867), impact energy due to a rear collision can be efficiently absorbed, and further, a side airbag is attached to a seat back frame having the above-described configuration, thereby causing a side collision. It is possible to reduce the impact load. However, when a weak portion is formed in the seat frame and a side airbag is attached to the weak portion, the side airbag has a high rigidity, and thus there is a possibility that the deformation of the seat frame may be difficult.
Therefore, there has been a demand for a technology that can efficiently absorb the impact energy of the rear impact and can efficiently absorb the impact energy of the side impact.

In the above technique (Japanese Patent Application No. 2010-273867), if a weak portion is formed in the lower part of the seat back frame, it depends on the magnitude of impact energy applied when the seat back frame is deformed to tilt backward. As a result, the rearward tilt angle becomes too large, and the seating posture of the occupant may change to impair the seating feeling.
Therefore, as described above, in the vehicle seat in which the seat back frame (seat) is bent and deformed when an impact load is applied, the amount of bending is restricted, and the amount of deformation of the seat back frame (seat) (rear) There has been a demand for a technique capable of controlling the tilt angle.

  An object of the present invention is to provide a vehicle seat that can efficiently absorb impact energy at the time of a collision, particularly at the time of a rear collision, and can efficiently absorb the impact energy of a side collision.

According to the vehicle seat of the present invention, the subject includes a frame side portion located on the left and right sides, and a side airbag unit provided on the frame side portion. A fragile portion that is deformed when a load is applied is provided, and the fragile portion is positioned below the side airbag unit and is formed at a rear end position of the frame side portion. .

  With the above configuration, the side airbag unit is provided on the frame side portion, and the fragile portion is formed at a position where the side airbag unit does not overlap the frame side portion. Even when the impact load is applied, a vehicle seat capable of efficiently absorbing impact energy can be provided.

In the above vehicle seat, the fragile portion may be behind the center line passing through the center in the short direction of the main body along the longitudinal direction of the main body of the side airbag unit, and the side It is good to be located below the air bag unit.
In the above vehicle seat, the fragile portion may have a curved portion so as to bulge outward in the width direction of the vehicle seat.

  In the above vehicle seat, the fragile portion may be formed so as to continue from a predetermined position of the frame side portion to a rear end position of the frame side portion.

  In the above vehicle seat, the fragile portion may be formed so as to extend from a position recessed forward at the rear end of the frame side portion.

  The vehicle seat may further include a restricting portion that restricts a deformation amount of the vehicle seat when the vehicle seat is deformed along with the deformation of the fragile portion, and the restricting portion comes into contact with the vehicle seat. It is good to consist of the 1st control part and the 2nd control part which control the deformation amount of the said vehicle seat by fitting.

In the above vehicle seat, the frame side portion includes a side frame main body portion and a frame base portion positioned below the side frame main body portion, and the weak portion is formed in the frame base portion. It is good to be.

Moreover, in said vehicle seat, the said side frame main-body part and the said frame base part are good to be comprised by the separate member.
Further, in the above vehicle seat, a hole is provided in the frame side portion, and the hole may be provided in a position aligned with the fragile portion in the vertical direction.
In the above vehicle seat, a plurality of the holes may be provided in the frame side portion, and at least one or more of the holes may be provided in a position aligned with the fragile portion in the vertical direction.
Further, in the above vehicle seat, a plurality of the holes are provided in the frame side portion, and the plurality of holes are provided at positions away from a position aligned with the fragile portion in the vertical direction. It is good to have.
In the above vehicle seat, a reclining mechanism may be attached to the frame side portion, and the fragile portion may be provided at a position aligned with the reclining mechanism in the vertical direction.
In the above vehicle seat, the fragile portion may be provided above the reclining mechanism.

  According to the present invention, the side airbag unit is provided on the frame side portion, and the fragile portion is formed at a position where the side airbag unit does not overlap the frame side portion. Even when an impact load is applied, a vehicle seat capable of efficiently absorbing impact energy can be provided.

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 rear view of the seat frame concerning one embodiment of the present invention. It is a schematic perspective view of the frame base part which concerns on one Embodiment of this invention. It is sectional drawing by the AA line of FIG. It is explanatory drawing which shows the state after the rear surface collision of the frame base part which concerns on one Embodiment of this invention. It is explanatory drawing of the side frame of the seat frame which concerns on one Embodiment of this invention. It is explanatory drawing which shows the state before the rear surface collision of the flame | frame which concerns on one Embodiment of this invention. It is explanatory drawing which shows the state after the rear surface collision of the flame | frame which concerns on one Embodiment of this invention. It is a perspective view of the periphery of the side frame which concerns on other 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. Furthermore, 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., and occurs at the time of normal seating. It does not include energy due to the load in the load region similar to the load. The impact energy at the time of a side collision is energy due to a large load generated at the time of a side collision, which is accompanied by a large rear-end collision by a vehicle from the side, and is the same load area as the load generated at the time of normal seating. It does not include energy due to the load.
Further, 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 (seat width direction) of the seat back frame 1 described later. The front-rear direction means the front-rear direction in a state where an occupant is seated.

  1 to 9 relate to an embodiment of the present invention. FIG. 1 is a schematic perspective view of a vehicle seat, FIG. 2 is a schematic perspective view of a seat frame, FIG. 3 is a rear view of the seat frame, and FIG. 5 is a schematic perspective view of the base portion, FIG. 5 is a cross-sectional view taken along line AA of FIG. 4, FIG. 6 is an explanatory view showing a state after a rear collision of the frame base portion, and FIG. 7 is an explanatory view of a side frame of the seat frame. FIG. 8 is an explanatory diagram showing a state before the rear collision of the frame, and FIG. 9 is an explanatory diagram showing a state after the rear collision of the frame. FIG. 10 is a perspective view of the periphery of the side frame according to another embodiment of the present invention.

<< Basic configuration of vehicle seat S >>
With reference to FIG. 1 thru | or FIG. 9, the vehicle seat S which concerns on this 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 attached to the seat frame F and the cushion pad 1 a. , 2a are placed and covered with skin materials 1b, 2b. The headrest S3 is formed by arranging a pad material 3a on a core material (not shown) of the head and covering it with a skin material 3b. 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 that constitutes a seat back S1, and a seat frame 2 that constitutes a seat portion S2.
The seating frame 2 has the structure in which the cushion pad 2a is placed as described above and is covered with the skin material 2b from above the cushion pad 2a, and the occupant is supported from below. The seating frame 2 is supported by a leg (not shown), and an inner rail (not shown) is attached to the leg, and the slide type is adjustable in the front-rear direction with the outer rail installed on the vehicle floor. Is assembled.
Further, the rear end portion of the seating frame 2 is connected to the seat back frame 1 via a reclining mechanism 11.

  The reclining mechanism 11 is attached to a seating side frame 60 as a frame side portion. The reclining mechanism 11 includes at least a reclining shaft 11 a along the rotation axis of the reclining mechanism 11, and the reclining shaft 11 a is a pair of frame base portions 17 (members) disposed below the seat back frame 1. A shaft insertion hole 17c (see FIG. 4) provided in the side) is fitted and disposed so as to protrude from the side portion of the seat frame F.

  The seat back S1 has the cushion pad 1a mounted on the seat back frame 1 as described above and is covered with the skin material 1b from above the cushion pad 1a, and supports the back of the occupant from the rear. . In the present embodiment, the seat back frame 1 is a substantially rectangular frame as shown in FIG. 2, and includes a side frame main body portion 15, an upper frame 16, a frame base portion 17, and a lower frame. Part 18. Note that the side plate 15a of the side frame main body 15 described below, the side portion 16a of the upper frame 16, the side plate 17a of the frame base portion 17, and the seating side frame 60 of the seating frame 2 are included in the present invention. Corresponds to the “frame side portion”. Further, in the seat back frame 1, a side frame 70 is configured by the side frame main body portion 15 and the frame base portion 17.

  The two (a pair of) side frame main body portions 15 are disposed so as to be separated from each other in the left-right direction and to extend in the up-down direction in order to constitute a seat back width. An upper frame 16 that connects the upper end portions of the pair of side frame main body portions 15 extends upward from the side frame main body portion 15. The upper frame 16 extends upward from one side frame main body 15, then bends, and extends to the other side frame main body 15. That is, the upper frame 16 includes a side part 16a and an upper part 16b.

  The upper frame 16 made of a member having a closed cross-sectional shape (for example, a circular or rectangular cross section) is bent into a substantially U shape as shown in FIG. The side portion 16a of the upper frame 16 is disposed so as to partially overlap the side plate 15a of the side frame main body portion 15 along the vertical direction, and is fixedly bonded to the side frame main body portion 15 at the overlapping portion. Is done. 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.

  A headrest S3 is disposed on the upper portion 16b of the upper frame 16. As described above, the headrest S3 is configured such that the pad material 3a is provided on the outer peripheral portion of the core material (not shown) and the outer periphery of the pad material 3a is covered with the skin material 3b. 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 main body 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 of the side plate 15a. Part (end located on the vehicle front side) bent inward in a U-shape, folded back front edge 15b, and rear edge 15c bent inward in an L-shape from the rear end Yes. Note that the rear end portion and the rear edge portion 15c of the side plate 15a are not only configured to be formed by bending a plate material, but also may be configured to join two plate pieces at the connecting portion 15x.

  Further, a side airbag unit 50 in which a side airbag is accommodated is attached to the side plate 15 a of the side frame main body 15. The side airbag unit 50 includes a main body 51 that houses a side airbag that operates when a large impact load is applied from the side, and an attachment for attaching the main body 51 to the side frame main body 15. Part 52. Then, the attachment portion 52 is fixed on the side plate 15 a of the side frame main body portion 15 by the fastening means 53.

Furthermore, a projection 15d projecting toward the rear edge 15c is formed on the front edge 15b of the present embodiment, and a tension coil spring 35 as an urging means is locked to the projection 15d. A locking hole is formed as a locking portion for this purpose.
And the below-mentioned moving member 30 is latched by the side frame main-body part 15 of this embodiment. The configuration and operation of the moving member 30 will be described in detail below.

<< Configuration of Pressure-Receiving Member 20 >>
In the seat back frame 1 (between the side frame main body portions 15 on both sides), a pressure receiving member 20 as a pressure receiving member that supports the cushion pad 1a from behind 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 1a. As shown in FIG. 2, a wire 21 as a connecting member disposed above and a wire 22 as a connecting member disposed below are latched on the upper and lower sides of the pressure receiving member 20. The claw part for doing is formed.

  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 installed between the side frame main body portions 15 on both sides, and the pressure receiving member is formed by claw portions formed at predetermined positions on the upper side and the lower side on the back side of the pressure receiving member 20. The pressure receiving member 20 is supported on the back surface of the cushion pad 1a. 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.

  In particular, among 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.

  Moreover, since the wire 22 is formed of a thick wire, it has high rigidity and is difficult to be deformed 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 is easy to move 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 backward, 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 this embodiment, both ends of the wire 21 locked to the upper side are the side frame main body portions 15 on both sides. Is attached to a shaft support portion 21a provided on the shaft. On the other hand, both end portions of the wire 22 locked to the lower side are hooked to a moving member 30 mounted on the left and right side frame main body portions 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 30 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 30 >>
The moving member 30 as an impact reducing member moves to the rear of the vehicle by the impact load transmitted through the connecting member (wire 22) when a predetermined impact load 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 30 that rotates about the shaft portion 32 as a rotating shaft will be described. Due to the movement of the moving member 30 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 applied to the occupant can be efficiently reduced.

As shown in FIG. 2, the moving member 30 of the present embodiment is pivotally supported on the inner side of the side plates 15 a of the side frame main body portions 15 on both sides via a shaft portion 32 as a rotation shaft, and is connected. The wire 22 at the lower position as a member is locked, and is connected to a spring (a tension coil spring 35) as an urging means for urging the wire 22. That is, the moving member 30 is connected to the urging means 35, and is configured to urge the pressure receiving member 20 toward the front side of the seat back frame 1 through the wire 22 as a connecting member.
The moving member 30 according to the present embodiment has a convex portion 15e formed by a pivotable shaft portion 32 that is formed such that a part of the side plate 15a bulges to the inside of the seat, more specifically inside the side frame main body portion 15. Is pivotally supported.

The moving members 30 described above are attached to the side frame main body portions 15 on both sides, and both ends of the wire 22 are hooked on the moving members 30 arranged on both sides, respectively. It is configured to operate individually.
In the present embodiment, the moving members 30 are attached to the side frame main body portions 15 on both sides, and the moving members 30 attached to both sides are configured to move (turn) independently of each other. . For this reason, when the load is generated in the left-right direction, the moving members 30 attached to the side frame main body portions 15 on both sides move (rotate) independently according to the load. Depending on the magnitude of the load, the occupant's body can be sunk backward.

<< Effects of pressure receiving member 20 and moving member 30 >>
Hereinafter, the configuration and operation of the pressure receiving member 20 and the moving member 30 will be described.
During normal seating when the occupant is seated, a tension is generated that causes the moving member 30 to move backward (turn) via the cushion pad 1a, the pressure receiving member 20, and the wire 22 in the seat back S1. On the other hand, the tension coil spring 35 urges the moving member 30 to move (turn) to the front side of the seat back frame 1. Here, since the tension coil spring 35 connected to the moving member 30 has a load characteristic that does not bend in a load region generated during normal seating, the moving member 30 is always restrained to the initial position. . That is, the force for returning to the initial state against the force for moving (turning) the moving member 30 is configured to be maximized during normal seating.

The movement preventing portion 39 provided in the moving member 30 is in contact with the rear edge portion 15c of the side frame main body portion 15 after the moving member 30 is moved (turned) to prevent the movement (turning). It is.
The movement preventing portion 39 of the moving member 30 is integrally formed by extending the moving member 30 in the outer peripheral direction, and the side frame main body portion 15 (more specifically, after the contact surface moves (turns)). Since it abuts against the rear edge 15c), the movement (rotation) of the moving member 30 can be stably stopped even 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. .
The movement preventing portion 39 is formed at a position where it does not interfere with the urging means (the tension coil spring 35) and the connecting member (the wire 22).

  In the present embodiment, the movement preventing portion 39 of the moving member 30 is configured to directly contact the side frame main body portion 15 to prevent movement (turning). A silencer such as a rubber having a thickness that does not hinder the stability of the movement (rotation) stop of the moving member 30 may be attached between the main body 15 and the main body 15 in order to eliminate the noise generated at the time of contact. In this way, a stable movement (turning) can be prevented and a silencing effect can be expected.

  At all times, the moving member 30 abuts against the side frame main body 15 (more specifically, a portion in which a part of the convex portion 15e is notched), and presses the upward force applied by the tension coil spring 35, thereby moving the moving member 30. The range of movement (rotation) is limited so that 30 does not move (rotate) too much forward.

  At the time of a rear collision, if the occupant tries to move rearward due to inertia, the load moves the moving member 30 rearward via the pressure receiving member 20 and the wire 22 locked to the pressure receiving member 20 (rotation). Tension is applied in the direction of movement. The tension at this time is a load sufficient to extend the tension coil spring 35 that holds the moving member 30 in the initial position and to move (turn) the moving member 30 backward.

The threshold value of the force at which the moving member 30 starts moving (turning) is set to a value larger than the normal seating load.
Here, the threshold value of the force at which the moving member 30 starts moving (turning) is normally applied to the seat back S1 in a seated state (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 an acceleration load that occurs due to a sudden start of the vehicle. Does not operate and can maintain a stable state.

  As described above, when the moving member 30 is moved (rotated) rearward, the wire 22 hooked on the moving member 30 moves rearward, and at the same time, the pressure receiving member 20 locked to the wire 22. Then, the cushion pad 1a supported by the pressure receiving member 20 moves rearward, and the occupant can be sunk into the seat back S1.

Since the moving member 30 has the above-described movement (turning) characteristics with respect to the tension generated via the wire 22, when the rear collision occurs, the occupant can be seated back reliably and efficiently. It can be made to sink in the cushion pad 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.
Furthermore, as described above, the impact energy can be efficiently transmitted to the side frame main body 15 by the wire 22 locked to the moving member 30.

  Although the example which provided the moving member 30 in the side frame main-body part 15 of right-and-left both sides is shown in the said embodiment, it is good also as a structure provided only in one side frame main-body part 15. FIG. In this case, the wires 21 and 22 can be directly engaged with the side frame body 15 on the side where the moving member 30 is not provided.

<<< Fundamental structure of frame foundation 17 and lower frame erection 18 >>>
In the seat back frame 1, a lower frame erection part 18 (member center) joined to the frame base part 17 corresponds to a connection frame, and connects a pair of frame base parts 17 that are spaced apart in the left-right direction. Formed in such a manner as to be in contact with the frame base portion 17. At this time, it is preferable that the lower frame erection part 18 is joined to both the side plate 17a and the intermediate plate 17b because the mounting rigidity is improved. Furthermore, if the side edge of the lower frame erection part 18 is formed so as to abut against the side plate 17a, the rigidity is improved with respect to the side load. In the present embodiment, the lower frame erection portion 18 is disposed in front of the intermediate plate 17b, but may be disposed in the rear of the intermediate plate 17b.

  In the seat back frame 1 of the present embodiment, the side frame main body portion 15 and the frame base portion 17 are formed as separate members, but may be formed as an integral plate frame or the like. Moreover, although the frame base part 17 and the lower frame erection part 18 show the example formed as a separate member, respectively, it is good also as a structure formed integrally.

  The vehicle seat S of the present invention (more specifically, the frame base portion 17) has a fragile portion that deforms when an impact load is applied (a hole portion 17k, an inner fragile portion 17e, a side fragile portion, which will be described below). 17m), and a restricting portion 40 (a first restricting portion 41 and a second restricting portion 42 described below) that are disposed at positions sandwiching a part of the weak portion and restrict the deformation amount of the weak portion. I have. 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.

<< Configuration of frame basic part 17 >>
The frame base portion 17 includes a side plate 17a extending in the vertical direction (front-rear direction) and an intermediate plate 17b extending from the side plate 17a toward the inner side in the left-right direction. As shown in FIG. 4, the side plate 17a and the intermediate plate 17b are connected to each other at a connecting portion 17x. The frame base portion 17 is a hole as a first weak portion formed on the rear end portion of the side plate 17a (the connecting portion 17x connecting the side plate 17a and the intermediate plate 17b) as the weak portion. It has the part 17k and the side weak part 17m as a 2nd weak part connected with the hole part 17k and formed on the side board 17a.
Further, in the frame base portion 17, an inwardly fragile portion 17e is formed as a third fragile portion connected to the hole portion 17k and formed on the intermediate plate 17b.

  The frame base portion 17 is bent toward the inside of the side frame main body portion 15 substantially vertically from the side plate 17a joined to the side plate 15a of the side frame main body portion 15 and the rear end portion of the side plate 17a. And an intermediate plate 17b formed. A shaft insertion hole 17c through which the reclining shaft 11a is inserted is formed below the side plate 17a, and the seating frame 2 is disposed below the side plate 17a via the reclining mechanism 11.

  In the side plate 17a, a plurality of attachment holes 17d for attaching the frame base portion 17 to the side frame main body portion 15 are formed above the shaft insertion hole 17c. A hole is provided below the side frame body 15 at a position aligned with the mounting hole 17d when the side plate 17a is overlapped. The hole formed in the side frame body 15 and the frame foundation A joining means such as a bolt is penetrated so as to penetrate the mounting hole 17d of the part 17, and the side frame main body part 15 and the frame base part 17 are joined. Note that the plurality of attachment holes 17d formed need not all be fixed to the side frame main body 15, and a member other than the side frame main body 15 may be attached.

  In the intermediate plate 17b, in order to efficiently absorb the impact energy at the time of the rear collision, an inward fragile portion 17e having flexibility with respect to a predetermined or higher impact load is formed. The inward fragile portion 17e has a substantially semicircular cross section and is formed by a concave portion that is recessed forward, and is formed to extend toward the inside of the pair of side frame main body portions 15. In other words, the inward fragile portion 17e is a recess formed so as to be recessed toward the inside of the side frame main body portion 15 along the left-right direction, that is, the seat width direction.

  When the occupant suddenly moves backward, such as at the time of a rear collision, the inner weak portion 17e is crushed in the vertical direction by receiving the impact load, and the frame base portion 17 is deformed to be bent. Accordingly, the seat back frame 1 tilts backward. Therefore, it is preferable that the inwardly fragile portion 17e is formed in the frame base portion 17 provided below the side frame main body portion 15 among members constituting the lower frame. In addition, in order to absorb the impact energy at the time of a rear collision, if the frame base part 17 can be bent enough, the inward weak part 17e is good also as a structure dented so that it may dent back. Furthermore, in order to easily deform the inner fragile portion 17e as long as it has a strength that can withstand a normal seating load, only the thickness of the portion constituting the inner fragile portion 17e may be formed thin.

  The inwardly fragile portion 17e formed on the intermediate plate 17b of the frame base portion 17 is a horizontal portion that extends along the longitudinal direction (the seat width direction) of the lower frame (more specifically, the lower frame erection portion 18). (Horizontal portion 17f), a bent portion 17g formed on one end side in the longitudinal direction of the horizontal portion 17f, and an inclined portion 17h extending obliquely upward from the bent portion 17g.

  And the horizontal part 17f which comprises the inward weak part 17e has a part of the inward weak part 17e (more specifically, the horizontal part 17f) in the edge part on the side facing the bending part 17g in the longitudinal direction. It is cut out. The notched portion is a hole portion 17k, and the hole portion 17k and the inwardly weakened portion 17e are formed so as to be connected. Thus, since the inwardly weakened portion 17e and the hole portion 17k are formed so as to be connected, when an impact load such as a rear collision is applied to the frame base portion 17, as described below, the hole The inner fragile portion 17e of the frame base portion 17 is deformed starting from the portion 17k, thereby absorbing impact energy. In addition, although the hole part 17k was shown as a 1st weak part of this embodiment, the 1st weak part does not necessarily need to be formed by the hole. The first fragile portion may be formed so as to be deformed by a smaller impact load than the side fragile portion 17m, which is the second fragile portion, and the inner fragile portion 17e, which is the third fragile portion. Further, a configuration in which the plate thickness is formed thinner than the side fragile portion 17m and the inner fragile portion 17e, or a configuration formed by a deeply recessed portion may be employed.

  In order to make the hole 17k easier to deform than the fragile part (inner fragile part 17e and side fragile part 17m) with respect to the impact load, for example, the width (size in the height direction) of the hole part 17k is It is preferable to form at least the width of the horizontal portion 17f or the lateral weak portion 17m in the short direction (vertical direction) or slightly larger than that. By forming the size of the hole portion 17k in the height direction equal to or larger than the vertical width of the horizontal portion 17, when an impact load such as a rear collision is applied, the horizontal portion 17f is advanced. Since the hole portion 17k is easily deformed, the inner fragile portion 17e can be deformed starting from the hole portion 17k.

  The horizontal portion 17f provided in the inward weakened portion 17e can be bent when a predetermined impact load (a large impact load more than that during normal seating) is applied to the seat back frame 1, such as a rear collision. It can be deformed so as to collapse in the vertical direction (see FIG. 6). As a result, the rearward load can be stably and efficiently absorbed. Further, since the horizontal portion 17f extends along the seat width direction, that is, the longitudinal direction of the lower frame erection portion 18, even when a load in the left-right direction is applied, the load is received at the ridge line portion. And the rigidity of the frame base portion 17 with respect to the load in the seat width direction is extremely improved.

  As shown in FIG. 4, the horizontal portion 17f extends to a boundary portion between the intermediate plate 17b and the side plate 17a, that is, a portion where the hole portion 17k is formed. In other words, the hole 17k is formed in the boundary portion between the intermediate plate 17b and the side plate 17a, that is, in the connecting portion 17x. The hole 17k is formed so as to be deformed by an impact load smaller than that of the fragile portion (inner fragile portion 17e and side fragile portion 17m described later).

  The frame base portion 17 is formed by bending an intermediate plate 17b from the rear end portion of the side plate 17a toward the inside in the seat direction, and the bent portion (connecting portion 17x) provides rigidity against a load in the vertical direction. I have. Therefore, depending on the magnitude of the impact load, the frame base portion 17 becomes difficult to deform in the vertical direction, and it may be difficult to efficiently absorb the impact energy. However, the hole portion 17k is formed in the boundary portion (connecting portion 17x) between the intermediate plate 17b and the side plate 17a, and when an impact load such as a rear collision is applied, the hole portion 17k becomes a fragile portion (inward Since the fragile portion 17e and the side fragile portion 17m, which will be described later, are formed to be easily deformed, the hole portion 17k can be deformed so as to be crushed in the vertical direction first. As a result, since the upper part of the frame base portion 17 is deformed so as to tilt backward, it is possible to efficiently absorb the energy of the backward tilting load.

As described above, the inwardly fragile portion 17e includes the inclined portion 17h extending from the horizontal portion 17f via the bent portion 17g, and the inclined portion 17h includes the side plates 17a and 17a ( It is extended to the up-down direction edge part of the part pinched | interposed into the side board 17a, 17a) with which the pair of frame base parts 17 and 17 were equipped. In other words, the inclined portion 17h extends to the upper end portion or the lower end portion of the intermediate plate 17b provided inside the seat in the left-right direction.
In the present embodiment, a configuration is shown in which the inclined portion 17h is bent so as to incline upward toward the inside of the seat and extends to the inclined upper end portion of the intermediate plate 17b.

In this way, the inner fragile portion 17e is not configured to extend in a horizontal straight line consisting only of the horizontal portion 17f, but includes a bent portion 17g and extends in a direction other than a substantially horizontal direction, that is, in an oblique direction. By adopting a configuration including the portion (inclined portion 17h), the rigidity of the frame base portion 17 is improved around the bent portion 17g and the inclined portion 17h. Accordingly, when a load is applied that causes the seat back frame 1 to be tilted backward due to a rear collision or the like, the horizontal portion 17f is particularly easily deformed, and the impact energy can be efficiently absorbed.
Further, by extending the inclined portion 17h to the upper end of the intermediate plate 17b, the inner fragile portion 17e can be easily bent as a whole.

  The inclined portion 17h may be formed substantially perpendicular to the horizontal portion 17f, but is preferably formed inclined with respect to the horizontal portion 17f. That is, it is preferable that the inclined portion 17h has an acute angle or an obtuse angle with respect to the horizontal portion 17f. When the inclined portion 17h is formed substantially perpendicular to the horizontal portion 17f, the rigidity against the backward inclined load of the intermediate plate 17b is improved by the inclined portion 17h when a load that is inclined backward with respect to the seat back frame 1 is applied. The horizontal portion 17f is less likely to be deformed by a backward tilt load. On the other hand, when the inclined portion 17h forms an acute angle or an obtuse angle with respect to the horizontal portion 17f, the intermediate plate 17b can be appropriately deformed and the horizontal portion 17f can be bent.

  The horizontal portion 17f has a hole portion 17k at an end portion on the side facing the end portion on the side where the bent portion 17g and the inclined portion 17h are formed. Accordingly, since the hole 17k is formed at a position farthest from the bent portion 17g and the inclined portion 17h in the horizontal portion 17f (that is, a position where rigidity is not relatively high and is easily deformed), when an impact load is applied. In addition, the hole portion 17k is easily deformed, and accordingly, the horizontal portion 17f can be deformed to absorb the impact energy.

Further, on the opposite side of the bending portion 17g in the bending direction (downward in FIGS. 3 and 4), a harness mounting portion 17i as a bulging component mounting portion is formed. At this time, the harness attachment portion 17i is formed so as to bulge to the side opposite to the bulging direction of the inner weak portion 17e. That is, a harness mounting portion 17i is formed below the bent portion 17g so as to bulge backward. Thus, in the intermediate plate 17b, the harness attachment portion 17i is formed on the opposite side to the direction in which the bent portion 17g of the inward fragile portion 17e is bent (that is, the obtuse angle side formed by the horizontal portion 17f and the inclined portion 17h). As a result, a plurality of uneven shapes are formed on the intermediate plate 17b, and the rigidity of the frame base portion 17 with respect to the load (particularly, the rigidity near the bent portion 17g) is improved. As a result, when an impact load such as a rear collision is applied, the horizontal portion 17f, the bent portion 17g, and the inclined portion 17h of the inner fragile portion 17e are bent without bending portions other than the inner fragile portion 17e. Can absorb impact energy.
In order to make the side frame main body part 15 particularly easy to tilt backward due to an impact load at the time of a rear collision, the harness mounting part 17i is provided above the bent part 17g for the purpose of improving rigidity below the upper part of the intermediate plate 17b. Instead, it is preferable to provide it below.

  Further, a plurality of attachment holes 17j are formed in the intermediate plate 17b. The attachment holes 17j are inserted with joining means such as bolts when other members (actuators or the like) are attached to the seat frame F.

  Thus, by providing the harness attachment portion 17i and the attachment hole 17j in the intermediate plate 17b, it is possible to save space and reduce the number of parts with respect to attachment of other members.

  The side fragile portion 17m is formed at the same height as the inner fragile portion 17e formed on the intermediate plate 17b, and a hole portion 17k formed at the boundary between the side plate 17a and the intermediate plate 17b. It extends in the horizontal direction from the front side. And the side weak part 17m extended from the hole 17k is extended to the center part in the front-back direction of the side board 17a on the side board 17a.

  The side weakened portion 17m has a substantially semicircular cross section and is recessed so as to be recessed from the inside toward the left and right direction (sheet width direction) outside of the side plate 17a. And the side weak part 17m is formed so that it may extend linearly toward the front from back. That is, the side weakened portion 17 m is a concave portion that extends along the front-rear direction and is formed below the side frame main body portion 15.

  Further, the width (length in the height direction) of the lateral weak portion 17m may be formed to be smaller than at least the width in the short direction (vertical direction) of the horizontal portion 17f constituting the inner weak portion 17e. By forming the length of the side weakened portion 17m in the height direction to be smaller than the width of the horizontal portion 17f in the short direction (vertical direction), when an impact load such as a rear collision occurs, the horizontal portion 17f Since the side fragile portion 17m is easily deformed first, the side fragile portion 17m is deformed so as to be crushed in the vertical direction as the hole portion 17k is deformed by the impact load. As described above, when an impact load is applied, the side plate 17a of the frame base portion 17 bends and deforms in the vertical direction. As a result, the inner fragile portion 17e is further easily deformed, so that the impact energy is reliably stabilized. Can be absorbed. Further, in the present embodiment, the side fragile portion 17m is shown as being formed in a straight line, but may be bent like the inner fragile portion 17e.

  The inner fragile portion 17e and the side fragile portion 17m are formed by pressing the frame base portion 17 or the like. Moreover, the hole 17k may be formed by cutting after forming the inner weak part 17e and the side weak part 17m on the frame base part 17, or after forming the hole 17k in advance, the inner weak part may be formed. You may form the part 17e and the side weak part 17m.

In the present invention, the fragile portions (that is, the hole portion 17k, the inner fragile portion 17e, and the side fragile portion 17m) are between the reclining mechanism 11 and the side frame main body portion 15 (more specifically, the shaft insertion hole 17c and (Between the mounting holes 17d). That is, each weak part is formed above the reclining mechanism 11. With such a configuration, the lower portion of the seat back frame 1 is fixed by the reclining mechanism 11, so that the seat back frame 1 above the weakened portion can be easily tilted backward.
Furthermore, since each fragile portion is formed between the seating frame 2 and the side frame main body portion 15, deformation of each fragile portion is hindered by the seating frame 2 and the side frame main body portion 15 when an impact load is applied. The impact energy can be absorbed efficiently.

  And the hole part 17k, the inward weak part 17e, and the side weak part 17m are all formed in the same height. As described above, the three weak portions (the hole portion 17k, the inner weak portion 17e, and the side weak portion 17m) are formed at the same height, so that the seat back frame 1 is particularly stably tilted backward (deformed). The impact energy can be absorbed efficiently.

  Of the fragile portions (hole portion 17k, inward fragile portion 17e, side fragile portion 17m), the fragile portion (hole portion 17k, side fragile portion 17m) formed on the side plate 17a as the frame side portion. Is formed in a portion of the side plate 17a of the frame base portion 17 that is removed from a portion where the side airbag unit 50 overlaps when viewed from the lateral side. In the present embodiment, as shown in FIG. 7, the fragile portions (hole portion 17 k and side fragile portion 17 m) are formed below the side airbag unit 50.

  In more detail, the attachment portion 52 which is a part of the side airbag unit 50 has a fragile portion (the hole portion 17k and the hole portion 17k) when the side frame main body portion 15 and the frame base portion 17 are viewed from the side in the left-right direction. It is disposed at a position where it does not overlap with the side weak part 17m). That is, the fragile portion is formed below the attachment portion 52 of the side airbag unit 50. In addition, in FIG. 7, although the attachment part 52 illustrated the structure arrange | positioned in two places, it is not limited to this number, A weak part is among the attachment parts 52 provided with two or more. It is preferable that it is formed below the attachment portion 52 disposed at the lowest position.

  Thus, by providing the fragile portion below the side airbag unit 50 (more specifically, the attachment portion 52), the side frame main body portion 15 and the side air are located above the fragile portion at the time of rear collision. The bag unit 50 and the bag unit 50 are easy to tilt backward. As a result, impact energy can be absorbed efficiently. Furthermore, since the fragile portion is disposed at a position that does not overlap with the side airbag unit 50 (more specifically, the attachment portion 52), the side airbag unit 50 can be firmly fixed to the side plate 15a. It can suppress that the attachment rigidity of the side airbag unit 50 falls. As a result, when the side airbag operates, it is difficult to be affected by the fragile portion, and the side airbag can function effectively with respect to an impact load.

As described above, the side airbag unit 50 includes the attachment portion 52 attached to the side frame body portion 15 and the body portion 51 in which the side airbag is accommodated.
Moreover, the weak part formed in the side board 17a of the frame base part 17 is formed in the hole 17k as a 1st weak part formed in the rear-end part of the side board 17a, and the side board 17a. The side fragile portion 17m as a second fragile portion extending from the hole portion 17k, the attachment portion 52 of the side airbag unit 50 is located above the side fragile portion 17m, And it is arrange | positioned ahead.

  And the weak part (hole part 17k, side weak part 17m) formed on the side board 17a is back rather than the center (line A of FIG. 7) of the front-back direction of the side board 17a of the frame base part 17. As shown in FIG. Is formed. Further, the attachment portion 52 of the side airbag unit 50 is formed in front of a center line (line B in FIG. 7) that passes through the center in the front-rear direction of the main body portion 51 and extends in the vertical direction. The main body 51 is formed in a substantially rectangular shape in a side view, and a line B in FIG. 7 is a line extending along the longitudinal direction of the main body 51 through the center in the short direction of the main body 51. is there. Further, line A in FIG. 7 is a line extending in the vertical direction through the center in the front-rear direction in the portion with the largest width in the front-rear direction on the side plate 15a of the side frame main body 15.

  By setting the relative position between the fragile portion and the side airbag unit 50 as described above, the attachment portion 52 of the side airbag unit 50 and the fragile portion are not disposed close to each other, and as a result The side airbag unit 50 can be stably attached to the side plate 15 a of the side frame body 15.

  Moreover, the weak part (hole part 17k, side weak part 17m) formed on the side board 17a is formed below the impact reduction member 30, as shown in FIG. Thus, when the side frame main body 15 is viewed from the side in the left-right direction, the weakened portion is formed at a position that does not overlap with the impact reducing member 30, so that the impact reducing member 30 can be stably stabilized. It can be locked to the part 15. As a result, when the impact reducing member 30 operates, its behavior can be stabilized, and impact energy can be absorbed efficiently.

  In the frame base portion 17 in which the fragile portion having the above-described configuration is formed, the restricting portion 40 (the first portion) opposed to the rear surface of the intermediate plate 17b provided with the inner fragile portion 17e via the inner fragile portion 17e. The restriction part 41 and the second restriction part 42) are provided. The restricting portions 40 (the first restricting portion 41 and the second restricting portion 42) are attached to the inner plate 17b by means of welding or the like so as to face each other so as to sandwich the inner weak portion 17e. It is provided above and below the fragile portion 17e.

  When an impact load such as a rear collision is applied to the seat back frame 1, the intermediate plate 17b is bent backward so that the inwardly fragile portion 17e is crushed in the vertical direction, but the restricting portion 40 is shown in FIG. In addition, it is provided for restricting the amount of collapse of the inwardly fragile portion 17e (that is, the rearward tilt angle of the intermediate plate 17b and the seat back frame 1) from becoming larger than a certain value.

  That is, the pair of restricting portions 40 that are provided to face each other via the inwardly weakened portion 17e, when the bending of the inwardly weakened portion 17e provided on the intermediate plate 17b becomes large, the restricting portions 40 (first restricting portions) 41, the second restricting portion 42) are in contact with each other, 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 having restricting surfaces 41a and 42a that are disposed to face each other at a position sandwiching the inner weak portion 17e. That is, 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 When the fragile portion 17e is bent, there are provided restriction surfaces 41a and 42a for restricting the fragile portion 17e from bending over a certain amount. Therefore, for example, as shown in FIG. 5, 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 are larger in area, 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 inner weak portion 17e is bent. The deformation amount (backward tilt amount) of the frame 1 can be regulated.

  As described above, the restricting portion 40 including the first restricting portion 41 and the second restricting portion 42 disposed to face each other in the vertical direction has two facing portions formed at a position sandwiching the inwardly fragile portion 17e. The regulation surfaces 41a and 42a are respectively provided. The distance between the two restricting surfaces 41a and 42a is greater than the width in the height direction of the inner weak portion 17e (that is, the width in the direction sandwiched between the first restricting portion 41 and the second restricting portion 42). Is also formed small.

  Specifically, the lower end portion of the first restricting portion 41 (that is, the restricting surface 41a) provided above is arranged below the upper end portion of the inward weakened portion 17e (more specifically, the horizontal portion 17f). Established. On the other hand, the upper end portion (that is, the restricting surface 42a) of the second restricting portion 42 provided below is above or substantially the same height as the lower end portion of the inward weakened portion 17e (more specifically, the horizontal portion 17f). It is arranged. In addition, in FIG. 5, the control surface 42a of the 2nd control part 42 provided below is illustrated in the state arrange | positioned in the substantially same height as the lower end part of the inward weak part 17e.

  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 larger than the width in the direction in which the pair of restricting portions 40 of the inward fragile portion 17e are arranged side by side. It is formed small. In other words, in FIG. 5, the distance α between the opposing regulating surfaces 41a and 42a and the vertical width β of the inwardly weakened portion 17e are formed such that α <β.

  By adopting such a configuration, when the inner fragile portion 17e is bent in the vertical direction, as shown in FIG. 6, the restricting portions 40 arranged in the vertical direction of the inner fragile portion 17e (first restriction) The portion 41 and the second restricting portion 42) can easily come into contact with each other, and the deformation of the inner fragile portion 17e can be suppressed 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 inner fragile portion 17e 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, It becomes easy for the restricting portions 40 (first restricting portion 41 and second restricting portion 42) to come into contact with each other. As a result, the amount of bending of the inner weak portion 17e is limited, and the amount of deformation of the seat back frame 1 does not become larger than the specified value.

  As shown in FIG. 6, in the restricting portion 40 having the restricting surfaces 41a and 42a formed in a flat shape, the inner weak portion 17e is deformed when an impact load is applied, and the first restricting portion 41 is the second restricting portion 41. The first restricting portion 41 is formed so as to be in contact with a restricting surface 42a formed in a flat shape. That is, when the inner weak portion 17e 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 inner weak portion 17e. Is extended further to the rear side (the side opposite to the inward weakened portion 17e) than the edge on the side opposite to the side where the is formed. 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. Slipping and shifting are suppressed, and the deformation of the inner fragile portion 17e can be suppressed more stably.

  In order to achieve the above-described configuration, for example, in a state before the impact energy is applied (normal state), the rear end side (the side opposite to the inward fragile portion 17e) of the restriction surface 42a of the second restriction portion 42 is the edge portion. Is formed to be behind (on the opposite side to the inner fragile portion 17e) the rear side (on the opposite side to the inner fragile portion 17e) of the first restricting portion 41 (on the opposite side to the inner fragile portion 17e). It is good to be.

As shown in FIGS. 5 and 6, it is preferable that the restricting portion 40 has a hollow structure because the vehicle seat S can be reduced in weight, but the strength of the restricting portion 40 is sufficiently ensured. Therefore, it may be solid. Moreover, as shown in FIG. 4, the hole may be provided in each control surface 41a, 42a for weight reduction.
Moreover, although the control part 40 showed the example provided only in the vicinity of the inward weak part 17e, you may be provided in the vicinity of the other weak part (hole part 17k, side weak part 17m). At this time, at least one of the hole portion 17k, the inner fragile portion 17e, and the side fragile portion 17m may be disposed at a position sandwiched between the restricting portions 40.

<< Effects of weak part (hole 17k, lateral weak part 17m, inward weak part 17e) and regulating part 40 >>
The manner in which the frame base portion 17 is deformed when an impact load at the time of a rear collision is applied will be described below with reference to FIGS.
FIG. 8 shows a state around the lower frame base portion 17 in a normal state, and FIG. 9 shows a state after the impact load at the time of rear collision is applied to the lower frame base portion 17. At this time, a load in a backward tilting direction is mainly applied to the seat back frame 1, but the largest load is applied below the side frame 15, that is, to the lower frame base portion 17.

  Then, when the load is transmitted to the frame base portion 17, the side weakened portion 17m formed on the side plate 17a is deformed into a shape crushed in the vertical direction starting from the hole portion 17k, and the side plate 17a. Is deformed so as to spread outward in the sheet width direction. Thus, by providing the hole portion 17k and further providing the side weakened portion 17m on the side plate 17a, the side plate 17a spreads outward in the seat width direction compared to the case where the hole portion 17k is not provided. It can be made easier.

  As described above, after the side plate 17a is deformed so as to spread outward in the sheet width direction, the inwardly fragile portion 17e (more specifically, the horizontal portion 17f) formed in the intermediate plate 17b is crushed in the vertical direction. As a result, the side frame main body 15 provided above the frame base portion 17 tilts backward, and the seat back frame 1 is deformed.

  As described above, the frame base portion 17 further includes the side weak portions 17m as well as the inward weak portions 17e and the holes 17k, thereby deforming the frame base portion 17 in a stepwise manner starting from the holes 17k. The impact energy can be absorbed efficiently. A complicated input load is applied to the seat back frame 1 at the time of a rear collision, etc., but by providing the above configuration, a specific portion (specifically, the horizontal portion 17f of the inward weakened portion 17e) is stably deformed. Can be made. As a result, it is possible to efficiently absorb the impact energy at the time of rear collision in the frame base portion 17.

  And when the inner weak part 17e bends as mentioned above, it is controlled by the control part 40 with which the intermediate | middle board 17b was equipped so that the bending amount of the inner weak part 17e may not become large too much. That is, when an impact load at the time of rear collision is applied, the inner weak portion 17e is bent so as to be crushed in the vertical direction, and the side frame main body portion 15 (and the seat back frame 1) tilts backward. When the one weak portion 17e 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 inner weak portion 17e is restricted. Therefore, by providing the restricting portion 40, it is possible to set the rearward tilt amount to an appropriate size without excessively increasing the rearward tilt amount of the seat back frame 1.

Furthermore, by providing the pressure receiving member 20 connected to the moving member 30, the vehicle seat S can sufficiently sink the occupant into the seat back S1 at the time of a rear collision. And since the bending part 17g and the inclination part 17h are formed in the inward weak part 17e of a lower frame (more specifically, the frame base part 17), the intermediate | middle board 17b has moderate rigidity. Therefore, the pressure receiving member 20 can easily sink the occupant's body relative to the side frame main body 15 and the upper frame 16, so that impact energy due to a rear collision or the like is efficiently transmitted to the seat back frame 1 and absorbed. It is possible to make it.
As a result, the inner fragile portion 17e and the side fragile portion 17m formed in the frame base portion 17 can be deformed, and the impact energy can be absorbed more efficiently.

<< Other Embodiments >>
In the above-described embodiment, the configuration in which the weak portion (the hole portion 17k, the side weak portion 17m, the inner weak portion 17e) and the restricting portion 40 are formed in the frame base portion 17 has been described. It is not limited to. For example, as will be described below, the fragile portion and the restricting portion may be formed in the side frame main body 115 constituting the side frame 170.

  As shown in FIG. 10, the side frame main body 115 (more specifically, the side plate 115a) of the present embodiment has a rear end portion (more specifically, the side plate 115a and the rear edge portion as a side portion of the frame). 115c as a first fragile portion formed on the connecting portion 115x linking 115c, and a side fragile portion as a second fragile portion connected to the hole 115f and formed on the side plate 115a. 115g.

  The hole 115f is a hole formed on the connecting portion 115x of the side frame main body 115, and can efficiently absorb impact energy at the time of a rear collision. In this way, by forming the hole 115f at the rear end of the side plate 115a, the side frame body 115 is bent rearward and the seat back frame 1 is tilted rearward, particularly when an impact load at the time of rear collision is applied. It is possible to absorb the impact energy effectively.

The configurations of the hole 115f and the side weakened portion 115g are the same as those of the hole 17k and the side weakened portion 17m described in the above embodiment, and thus description thereof is omitted. In the present embodiment, the inner weak portion 115h is shown as an example of being formed linearly on the rear edge portion 115c. However, like the inner weak portion 15h in the above embodiment, the inner weak portion 115h may have a bent shape. good.
Further, the side weakened portion 115g may also have a bent shape on the side plate 115a.

Said side weak part 115g and inward weak part 115h are each extended substantially horizontally from the hole 115f.
As shown in FIG. 10, at least the hole portion 115f and the side weak portion 115g are formed of the frame base portion 117 (more specifically, the side plate 117a and the intermediate plate 117b among the side plates 115a of the side frame main body portion 115. ) Is formed in a portion that is outside the overlapping portion.
More specifically, when the seat frame F is viewed from the side in the left-right direction, the fragile portion (the hole portion 115f and the side fragile portion 115g) is located on the side plate 115a and does not overlap with the frame base portion 117. Is formed. That is, the weak part (the hole 115f and the side weak part 115g) is formed above the upper end of the frame base part 117.

  The portion where the side plate 115a of the side frame main body 115 and the frame base portion 117 overlap is particularly high in rigidity, and when the weak portion is formed in the portion, it is difficult to sufficiently deform the weak portion even if an impact load is applied. Sometimes. On the other hand, as described above, the fragile portion (the hole portion 115f and the side fragile portion 115g) is formed on the side plate 115a at a position that does not overlap the frame base portion 117, so that an impact load is applied. At this time, the fragile portion is easily deformed. As a result, the side frame body 115 can be more easily deformed, and impact energy can be effectively absorbed.

Of the side plate 115a of the side frame main body 115, the side air bag unit 150 is formed at a portion where the side airbag unit 150 overlaps when viewed from the lateral direction. In the present embodiment, the fragile portion (the hole 115 f and the side fragile portion 115 g) is formed below the side airbag unit 150.

  When the occupant suddenly moves rearward, such as in a rear-end collision, the inner weak portion 115h is crushed in the vertical direction by receiving the impact load, and the side frame main body 115 is deformed to be bent. With this deformation, the seat back frame 1 tilts backward. In addition, in order to absorb the impact energy at the time of a rear surface collision, if the frame base part 117 can be bent enough, the inward weak part 115h is good also as a structure dented so that it may dent back. Furthermore, in order to easily deform the inner weak portion 115h as long as it has a strength that can withstand a normal seating load, only the plate thickness of the portion constituting the inner weak portion 115h may be formed thin.

  In addition, although the hole 115f was formed as a 1st weak part of this embodiment, and the side weak part 115g which consists of a recessed part was shown as a 2nd weak part, a 1st weak part and other weak parts are shown. The first fragile portion does not necessarily have to be formed by a hole as long as it can be deformed by a small impact load. The first fragile portion may be formed so as to be deformed by a smaller impact load than the side fragile portion 115g which is the second fragile portion and the inner fragile portion 115h which is the third fragile portion. Further, a configuration in which the plate thickness is formed thinner than the side weakened portion 115g and the inner weakened portion 115h, or a configuration formed by a deeply recessed portion may be employed.

  The side frame main body 115 is disposed at a position where a part of the fragile portion having the above-described configuration (more specifically, the inner fragile portion 115h) is sandwiched. A regulating unit 140 that regulates the amount of deformation is provided.

As described above, the restricting portion 140 (the first restricting portion 141 and the second restricting portion 142) facing the rear surface of the rear edge portion 115c provided with the inwardly weakened portion 115h via the inwardly weakened portion 15h. Is provided. The restricting portions 140 (the first restricting portion 141 and the second restricting portion 142) are attached to the rear edge portion 115c using means such as welding so as to face each other with the inner weak portion 115h interposed therebetween. It is provided above and below the weakened portion 115h. More specifically, the restriction surface 141a of the first restriction portion 141 and the restriction surface 142a of the second restriction portion 142 are provided at positions where the inner weak portion 115h is sandwiched.
In addition, since the structure of the 1st control part 141 and the 2nd control part 142 is the same as the structure of the 1st control part 41 of the said embodiment, and the 2nd control part 42, the description is abbreviate | omitted.

  When an impact load such as a rear collision is applied to the seat back frame 1, the inner weak portion 115h is bent backward so that the inner weak portion 115h is crushed in the vertical direction. It is provided for restricting the amount by which the fragile portion 15h is crushed (that is, the rearward tilt angle of the side frame main body 115 and the seat back frame 1) from becoming larger than a certain value.

  In each of the above-described embodiments, the behavior at the time of a rear collision has been described as a specific example of the fragile portion and the regulating portion. However, the configuration of the present invention is not limited to the case of a rear collision, for example, an impact at the time of a side collision. It can also be applied as a configuration for absorbing energy. Moreover, although the seat back S1 of the front seat of the automobile has been described, it is needless to say that the same configuration can be applied to the seat back of the rear seat.

DESCRIPTION OF SYMBOLS S Vehicle seat S1 Seat back S2 Seating part S3 Headrest F Seat frame 1 Seat back frame 2 Seating frame 1a, 2a, 3a Cushion pad (pad material)
1b, 2b, 3b Skin material 11 Reclining mechanism 11a Reclining shaft 15, 115 Side frame main body 15a, 115a Side plate (frame side)
15b Front edge 15c, 115c Rear edge (inner extension)
15d Protruding part 15e Convex part 15x, 115x Connecting part 115f Hole part (first weak part, weak part)
115g Side vulnerable area (second vulnerable area, vulnerable area)
115h Inward vulnerable part (third vulnerable part, vulnerable part)
16 Upper frame 16a Side part (frame side part)
16b Upper part 17,117 Frame base part 17a, 117a Side plate (frame side part)
17b, 117b Intermediate plate 17c Shaft insertion hole 17d, 17j Mounting hole 17e Inner fragile portion (third fragile portion, fragile portion)
17f Horizontal part 17g Bent part 17h Inclined part 17i Harness attaching part 17k Hole part (1st weak part, weak part)
17m Side vulnerable area (3rd vulnerable area, vulnerable area)
17x connecting part 18 lower frame construction part 19 headrest pillar 19a pillar supporting part 20 pressure receiving member 21 wire (connecting member)
21a Shaft support 22 Wire (connection member)
30 Moving member (impact reducing member)
32 Shaft 35 Tension coil spring (biasing means)
39 Movement prevention part 40,140 Restriction part 41,141 1st restriction part 41a, 141a Restriction surface (opposing part)
42,142 2nd control part 42a, 142a Control surface (opposing part)
50, 150 Side airbag unit 51 Main body 52 Attachment portion 53 Fastening means 60 Seating side frame (frame side portion)
70,170 side frame

Claims (13)

A frame side part located on the left-right side, and a side airbag unit provided on the frame side part,
The frame side portion includes a fragile portion that deforms when an impact load is applied,
The fragile portion is located below the side airbag unit and is formed at a rear end position of the frame side portion . The fragile portion is positioned behind a center line passing through the center in the short direction of the main body portion along the longitudinal direction of the main body portion of the side airbag unit and below the side airbag unit. The vehicle seat according to claim 1, wherein the vehicle seat is provided.   The vehicle seat according to claim 1, wherein the fragile portion has a curved portion so as to bulge outward in the width direction of the vehicle seat. The fragile portion is a vehicle according to any one of claims 1 to 3, characterized in that it is formed to be continuous from a predetermined position of the frame side to the rear end position of the frame side Sheet. The vehicular seat according to any one of claims 1 to 4 , wherein the fragile portion is formed to extend from a portion recessed forward at a rear end of the frame side portion. When the vehicle seat is deformed along with the deformation of the fragile portion, the vehicle seat further includes a regulating portion that regulates a deformation amount of the vehicle seat,
The regulating unit according to any one of claims 1 to 5, characterized in that it consists of a first regulating portion and a second regulating portion for regulating the amount of deformation of the vehicle seat by mutual contact Vehicle seats. The frame side portion includes a side frame main body portion, and a frame base portion positioned below the side frame main body portion,
The vehicle seat according to any one of claims 1 to 6 , wherein the fragile portion is formed in the frame base portion. The vehicle seat according to claim 7 , wherein the side frame main body part and the frame base part are constituted by different members. The side of the frame is provided with holes,
The vehicle seat according to claim 1, wherein the hole is provided at a position aligned with the fragile portion in the vertical direction. The frame side portion is provided with a plurality of the holes,
The vehicle seat according to claim 9, wherein at least one of the holes is provided at a position aligned with the fragile portion in a vertical direction. The frame side part is provided with a plurality of the holes,
The vehicle seat according to claim 9, wherein the plurality of holes include the holes provided at positions deviating from positions aligned with the fragile portions in the vertical direction. A reclining mechanism is attached to the side of the frame,
The vehicle seat according to claim 1, wherein the fragile portion is provided at a position aligned with the reclining mechanism in a vertical direction. The vehicle seat according to claim 12, wherein the fragile portion is provided above the reclining mechanism.

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