JP2020196449A - Vehicle seat - Google Patents

Abstract

To provide a vehicle seat which stably deforms at a specific position against a complicated input load exerted during a rear end collision to efficiently absorb impact energy generated during the rear end collision.SOLUTION: A vehicle seat S includes: frame side parts 15a, 17a positioned at left and right sides of a seat back frame 1 and extending in a vertical direction; and frame extension parts 17a, 18 extending from the frame side parts 15a, 17a to the inner side in a horizontal direction. Holes 17k, which deform when an impact load is applied, are respectively formed in connection parts 17x which connect the frame side parts 15a, 17a to the frame extension parts 17b, 18.SELECTED DRAWING: Figure 2

Description

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

In general, in the case of a so-called rear-end collision, such as a rear-end collision of a vehicle such as an automobile or a large collision when traveling backward, the seated occupant suddenly moves backward due to inertial force and the occupant's upper body. Tilt backwards.

Generally, 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, in the event of a rear collision or the like, the occupant suddenly 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, there is a risk that the seat back may malfunction.

In order to solve such a problem, in Patent Document 1, the side frame (described as "side member" in Patent Document 1) is bent when a backward load is applied to the upper part of the seat back frame. , A technique has been proposed to relieve the load applied to the occupant when moving backward.

Japanese Patent No. 4200800

In the seat back frame disclosed in Patent Document 1, when a load is applied to the rear as the occupant moves backward, such as during a rear collision, the side frame bends and the impact energy of the rear movement is absorbed by the seat back frame. To. However, since the seat back frame of Patent Document 1 cannot be deformed by limiting the deformed portion (bent portion) of the side frame, the seat back frame is bent at any point in 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 absorption efficiency of the impact energy is lowered, and it is difficult to stably reduce the impact energy.

Therefore, the applicant has applied to a technique of absorbing impact energy by deforming the seat back frame, by forming a flexible constriction portion in the lower frame, when an impact load is applied such as in a rear collision. We are proposing a technique for preferentially bending the constricted portion to efficiently absorb impact energy (Japanese Patent Application No. 2010-273867). By limiting the deformed portion of the seat back frame in this way, it is possible to efficiently absorb the impact energy.

However, in the above technique, a technique capable of stably absorbing impact energy by further limiting the bent portion has been desired. That is, there has been a demand for a vehicle seat having a configuration in which deformation of a specific portion is promoted to facilitate deformation with respect to a complicated input load applied to the seat back frame at the time of a rear surface collision and the seat is stably bent.

In addition, the rigidity of the part other than the specific part (deformed part) that is easily bent is improved to facilitate the position regulation of the deformed part, and even if a complicated input load is applied, the specific part is not deformed except for the specific part. A technique capable of more efficiently absorbing impact energy by deforming it has been desired.

An object of the present invention is to provide a vehicle seat capable of efficiently absorbing impact energy at the time of a rear surface collision by stably deforming at a specific location with respect to a complicated input load at the time of a rear surface collision. There is. Another object of the present invention is to improve the rigidity of a portion other than a specific portion (deformed portion) that is easily deformed to facilitate position regulation of the deformed portion, and to impact even if a complicated input load is applied at the time of a rear collision. The purpose is to provide a vehicle seat capable of efficiently and stably absorbing energy.

According to the vehicle seat of the present invention, the subject is a frame side portion located on the left and right sides of the seat back frame and extending in the vertical direction, and a frame extending inward in the left-right direction from the frame side portion. This is solved by the fact that the connecting portion provided with the extending portion and connecting the frame side portion and the frame extending portion is formed with a hole portion that deforms when an impact load is applied.

In this way, by forming a hole portion at the boundary portion (connecting portion) between the frame side portion constituting the seat back frame width and the frame extending portion extending inward in the seat width direction from the frame side portion. When an impact load such as a rear surface collision is applied, the seat back frame can be easily bent and deformed backward. In the seat back frame, the connecting portion between the frame side portion and the frame extending portion has high rigidity against a load along the extending direction (vertical direction) of the connecting portion, and thus generally has a rear surface. When the impact load of a collision is applied, the connecting portion is difficult to bend. However, by providing a hole portion that is deformed by the impact load in this connecting portion, when the impact load is applied, the hole portion is first deformed, and the seat back frame is bent and deformed in the vertical direction from that point. It will be easier to do. Therefore, when an impact load is applied, the seat back frame can be stably bent starting from the hole, and the impact energy can be efficiently absorbed.
Further, since the hole portion is provided in the portion having high rigidity such as the connecting portion, the bending portion can be limited to the vicinity of the hole portion as compared with the case where the hole portion is formed in the other portion.

At this time, as in claim 2, it is preferable that at least one of the frame side portion and the frame extension portion has a fragile portion connected to the hole portion.
By further providing the fragile portion connected to the hole portion in this way, when an impact load is applied, the fragile portion is deformed preferentially over the other portions, so that the seat back frame is easily deformed. In this way, since the fragile portion is further formed as a portion that deforms when an impact load is applied, not only the hole portion but also the fragile portion bends and deforms, so that the deformation position and deformation direction of the seat back frame. Can be controlled and impact energy can be absorbed efficiently.

Further, as in claim 3, it is preferable that the hole portion is formed so as to be deformed by an impact load smaller than that of the fragile portion.
As described above, since the hole portion is formed to be more easily deformed by the impact load than the fragile portion, the hole portion can be deformed first and then the fragile portion can be deformed when the impact load is applied. .. A complicated input load is applied to the vehicle seat at the time of a rear collision, but by providing a hole that is more easily deformed than the fragile part, the hole is deformed first, and then the fragile part connected to the hole. Is transformed. As a result, the deformation (bending) position and the bending deformation (bending) position of the seat back frame can be limited.
That is, with the above configuration, when an impact load is applied, the deformation of the hole portion can be promoted, and the fragile portion can be deformed starting from the hole portion. Therefore, when an impact load is applied to the vehicle seat, the fragile portion is deformed and the impact energy can be stably absorbed.

At this time, as in claim 4, the fragile portion has an inward fragile portion formed in the frame extending portion, and the inward fragile portion has a horizontal portion extending along the horizontal direction. A bent portion formed on one end side in the longitudinal direction of the horizontal portion and an inclined portion extending inclined from the bent portion are provided, and the inclined portion is a frame side portion of the frame extending portion. It is preferable that the portion sandwiched between the two is extended to the vertical end.
In this way, the inwardly fragile portion provided in the frame extending portion formed inside the seat in the left-right direction (width direction) is via the horizontal portion extending substantially horizontally in the left-right direction of the seat and the bent portion. It has an inclined part extending from the horizontal part.
At the time of a rear collision, the impact load applied to the seat back frame constituting the vehicle seat is mainly a load applied to the rear, more specifically, in the direction in which the seat back frame tilts backward, but it is a complicated input load. Therefore, by providing the horizontal part, the bent part, and the inclined part as the inner fragile part, the impact energy can be absorbed mainly by the horizontal part and the inclined part even for a complicated input load such as a rear surface collision. is there. Therefore, compared to the case where the fragile portion is formed in a straight line, by forming the inward fragile portion having a horizontal portion, a bent portion, and an inclined portion, it is possible to cope with a complicated input load and the impact energy is efficient. Can be absorbed well. As a result, the impact energy can be stably absorbed by the inner fragile portion.
Furthermore, by providing a horizontal portion, it is possible to receive a lateral load (a load in a direction parallel to the extending direction of the horizontal portion) by the ridgeline portion of the horizontal portion, so that the rigidity of the seat back frame with respect to the lateral load is obtained. Can be improved, which is preferable. Further, since the lateral load can be received by the inclined portion, the rigidity against the lateral load is further improved.
Further, by providing the bent portion and the inclined portion in the inwardly fragile portion, it is possible to improve the rigidity of the portion other than the horizontal portion that mainly bends against a backward tilt load, so that the horizontal portion can be bent. Become.

At this time, as in claim 5, it is preferable that the inwardly fragile portion is composed of a recess recessed forward.
By making the inner fragile portion a concave portion in this way, a simple structure can be obtained and the fragile portion can be easily formed.

Further, as in claim 6, it is preferable to have a reinforcing portion at least one above or below the fragile portion.
As described above, when the reinforcing portion is provided on at least one of the upper side and the lower side of the fragile portion, the reinforcing portion is provided at a position where the fragile portion does not overlap in the front-rear direction, and the portion other than the fragile portion is reinforced by the reinforcing portion. Therefore, when an impact load is applied, it is possible to suppress the deformation of the seat back frame from a portion other than the fragile portion, and it becomes easy to regulate the position of the deformed portion of the seat back frame and guide the deformation.

At this time, as in claim 7, it is more preferable that the reinforcing portion is provided at least one of the front side and the rear side of the fragile part.
When the reinforcing portion is provided in front of the fragile portion, the input of the load from the front to the portion that overlaps the reinforcing portion of the seat back frame in the front-rear direction is restricted, and deformation from the portion other than the fragile portion is suppressed. can do. Further, when the reinforcing portion is provided behind the fragile portion, the deformation of the portion overlapping the reinforcing portion of the seat back frame in the front-rear direction is restricted to the rear, and the deformation from the portion other than the fragile portion is suppressed. be able to. In this way, by providing the reinforcing portion at least one of the front side and the rear side of the fragile part, it is possible to suppress the deformation of the seat back frame from the part other than the fragile part when an impact load is applied. It becomes easy to regulate the position of the deformed part of the seat back frame and guide the deformation.

Further, as in claim 8, the reinforcing portion may be provided at a position where one end thereof overlaps the hole portion in the front-rear direction, including at least a boundary portion between the hole portion and the fragile portion.
In this way, by providing one end of the reinforcing portion at a position where it overlaps the hole portion in the front-rear direction including at least the boundary portion between the hole portion and the fragile portion, it is possible to prevent the deformation of the hole portion due to the impact load. It is possible to specify the direction of deformation of the hole even for a complicated input load. The hole and the fragile part are connected via the boundary part, and when an impact load is applied, the hole part is first deformed and the impact energy is transmitted to the fragile part from that point, so that the fragile part is reached. In order to efficiently transmit the impact energy, it is desired that the deformation of the hole is not hindered and the hole is deformed in a desired direction. By providing the reinforcing portion as described above, the deformation of the hole can be regulated, the deformation can be easily guided, the impact energy can be efficiently absorbed, and the seat back frame can be appropriately deformed. It will be possible.

Further, at this time, as in claim 9, it is preferable that a bulging component mounting portion is formed on the opposite side of the bent portion in the bending direction.
In this way, by forming the component mounting portion on the outer peripheral side of the inner fragile portion in the bending direction (the obtuse angle side of the angle formed by the horizontal portion and the inclined portion), the rigidity of the portion in the outer peripheral direction of the fragile portion is improved. Can be made to. When an impact load is applied, the fragile part deforms so as to bend up and down along the extending direction of the horizontal part, but the rigidity of the part mounting part is formed by forming the part mounting part on the outer peripheral side of the bending direction in the bending direction. Is improved and it becomes difficult to bend. As a result, when an impact load is applied, the horizontal portion, the bent portion, and the inclined portion can be flexed and deformed in order, and even if a complicated input load is applied such as at the time of a rear surface collision, the impact energy is generated by the inward fragile portion. Can be absorbed efficiently and stably.
In addition, by providing a plurality of irregularities and attaching parts such as harnesses to some of them, it is not necessary to separately assemble the members for attaching the parts, which saves space and further reduces the manufacturing process. It can be shortened.

Further, as in claim 10, a reinforcing portion provided behind the fragile portion can be configured as the article mounting portion.
In this way, by configuring the reinforcing portion provided behind the fragile portion as the article mounting portion, the reinforcing portion has a function of attaching parts and a function of a deformation guide that regulates the position of the deformed part of the seat back frame. It can be combined, and it is possible to contribute to the deformation of the seat back frame while reducing the number of parts.

Furthermore, as in claim 11, a seating frame is further provided below the seat back frame, the seat back frame has side frames located on the left and right, and the fragile portion is the frame side portion. It is preferable to have a lateral fragile portion formed between the seating frame and the side frame.
In this way, the lateral fragile portion constituting the fragile portion is provided between the seating frame and the side frame, that is, at a position not overlapping the frame. By forming the lateral fragile portion at this position, when an impact load is applied, the lateral fragile portion can be flexed and deformed without the rigidity of the lateral fragile portion being improved by the seating frame or the side frame. As a result, when a load in the backward tilting direction is applied to the seat back frame due to a rear surface collision or the like, the deformation of the lateral fragile portion is not hindered by the seating frame or the side frame, so that the impact energy is efficiently absorbed. Can be done.

According to the invention of claim 1, by providing a hole in the connecting portion between the frame side portion and the frame extending portion in the seat back frame, the seat back frame is deformed and stable starting from the hole portion at the time of a rear surface collision. The seat can be made into a vehicle seat capable of absorbing impact energy.
According to the invention of claim 2, by providing not only the hole portion but also the fragile portion, the fragile portion is deformed when an impact load is applied, and the deformation position and the deformation direction of the seat back frame can be controlled. it can. Therefore, it is possible to obtain a vehicle seat capable of stably and efficiently absorbing impact energy.
According to the invention of claim 3, by forming the hole portion more easily deformed than the fragile portion, the hole portion can be bent first when an impact load is applied, and then the fragile portion can be bent. Therefore, the bending position and the bending position of the seat back frame can be limited, and the impact energy can be stably absorbed.
According to the invention of claim 4, by providing the horizontal portion, the bent portion, and the inclined portion in the inner fragile portion, the inner fragile portion is stably flexed and deformed even with a complicated input load at the time of a rear surface collision. It is possible to make it easier to absorb impact energy.
According to the invention of claim 5, the inner fragile portion can have a simple structure and can be easily molded.
According to the invention of claim 6, by having the reinforcing portion on at least one of the upper side and the lower side of the fragile portion, it is possible to suppress the deformation of the seat back frame from the portion other than the fragile portion, and the deformed portion of the seat back frame. Position regulation becomes easy.
According to the invention of claim 7, by providing the reinforcing portion on at least one of the front side and the rear side of the fragile portion, it is possible to suppress the deformation of the seat back frame from the portion other than the fragile portion, and the deformed portion of the seat back frame. Position regulation becomes easy.
According to the invention of claim 8, since one end of the reinforcing portion is provided at a position where it overlaps the hole portion in the front-rear direction including at least the boundary portion between the hole portion and the fragile portion, the hole portion is deformed by an impact load. It is possible to define the direction of deformation of the hole portion even with a complicated input load.
According to the invention of claim 9, the number of parts can be reduced and the number of parts can be reduced by forming the parts mounting portion on the outer peripheral side in the bending direction in the vicinity of the bent portion of the inner fragile portion. Since the rigidity in the vicinity can be improved, the fragile portion can be flexed and deformed from the horizontal portion to the bent portion and the inclined portion. Therefore, it is possible to provide a vehicle seat having high impact energy absorption efficiency.
According to the invention of claim 10, by configuring the reinforcing portion provided behind the fragile portion as the article mounting portion, it is possible to contribute to the deformation of the seat back frame while reducing the number of parts.
According to the invention of claim 11, by providing the side fragile portion between the seating frame and the side frame, when an impact load is applied, the deformation of the side fragile portion is not hindered and the impact is extremely efficient. It is possible to provide a vehicle seat capable of absorbing energy.

It is a schematic perspective view of the vehicle seat which concerns on 1st Embodiment of this invention. It is a schematic perspective view of the seat frame which concerns on 1st Embodiment of this invention. It is a rear view of the seat frame which concerns on 1st Embodiment of this invention. It is a schematic perspective view of the lower frame base part which concerns on 1st Embodiment of this invention. It is sectional drawing which is taken along the line AA of FIG. It is explanatory drawing which shows the state after the rear surface collision of the lower frame base part which concerns on 1st Embodiment of this invention. It is explanatory drawing which shows the state after the rear surface collision of the lower frame which concerns on 1st Embodiment of this invention. It is explanatory drawing which shows the state after the rear surface collision of the lower frame which concerns on 1st Embodiment of this invention. It is a schematic perspective view of the vehicle seat which concerns on 2nd Embodiment of this invention. It is a partially enlarged explanatory view of the lower frame erection part and the frame side part which concerns on 2nd Embodiment of this invention. It is a partial cross-sectional view of the lower frame which concerns on 2nd Embodiment of this invention. It is a rear view of the seat frame which concerns on 2nd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the members, arrangements, etc. described below are not limited to the present invention, and of course, various modifications can be made according to the gist of the present invention. Further, in the present specification, the vehicle means a taxiing vehicle having wheels such as an automobile or a railroad, an aircraft or a ship moving outside the ground, or the like for moving a seat. Further, the normal seating load includes a seating impact generated when sitting, a load during acceleration caused by a sudden start of a vehicle, and the like. Further, the impact energy at the time of a rear surface collision is energy due to a large load generated at the time of a rear surface collision, and is associated with a large collision due to a vehicle from the rear side, a large collision at the time of reverse travel, etc., and is generated at the time of normal seating. It does not include energy due to the load in the load region similar to the load.
Further, the left-right direction means a 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. Further, the front-rear direction means the front-rear direction when the occupant is seated.

1 to 8 relate to the first 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, and FIG. 3 is a rear view and a view of the seat frame. 4 is a schematic perspective view of the lower frame base portion, FIG. 5 is a cross-sectional view taken along the line AA of FIG. 4, FIG. 6 is an explanatory view showing a state after a rear surface collision of the lower frame base portion, and FIGS. 7 and 8 are lower portions. It is explanatory drawing which shows the state after the rear surface collision of a frame.

<< Basic configuration of vehicle seat S >>
The vehicle seat S according to the first embodiment will be described with reference to FIGS. 1 to 8.
As shown in FIG. 1, the vehicle seat S is composed of a seat back S1 (back), a seating portion S2, and a headrest S3. The seat back S1 (back) and the seating portion S2 are cushion pads 1a on the seat frame F. , 2a are placed and covered with skin materials 1b and 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 is a headrest pillar that supports the headrest S3.

As shown in FIG. 2, the seat frame F of the vehicle seat S is composed of a seat back frame 1 constituting the seat back S1 and a seating frame 2 constituting the seating portion S2.
As described above, the seating frame 2 is configured such that the cushion pad 2a is placed and covered with the skin material 2b from above the cushion pad 2a to support the occupant from below. The seating frame 2 is supported by legs (not shown), and an inner rail (not shown) is attached to the legs, and a slide type that can be adjusted back and forth between the seat frame and the outer rail installed on the vehicle body floor. It is assembled in.
Further, the rear end portion of the seating frame 2 is connected to the seat back frame 1 via the reclining mechanism 11.

The reclining mechanism 11 includes at least a reclining shaft 11a along the rotation axis of the reclining mechanism 11, and the reclining shaft 11a extends below the seat back frame 1 (more specifically, a pair of side frames 15). The shaft insertion holes 17c (see FIGS. 4 to 6) provided in the pair of lower frame base portions 17 (member sides) are fitted so as to project from the side portions of the seat frame F.

In the seat back S1, the cushion pad 1a is placed on the seat back frame 1 as described above, and the cushion pad 1a is covered with the skin material 1b from above the cushion pad 1a to support the back of the occupant from behind. .. In the present embodiment, as shown in FIG. 2, the seat back frame 1 has a substantially rectangular frame, and the side frame 15, the upper frame 16, the lower frame base portion 17, and the lower frame erection portion 18 And have.

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

As shown in FIG. 2, the upper frame 16 made of a member having a closed cross section (for example, a circular cross section, a rectangular cross section, etc.) is bent in a substantially U shape. The side surface portion 16a of the upper frame 16 is arranged so as to partially overlap the side plate 15a of the side frame 15 in the vertical direction, and is fixedly joined to the side frame 15 at this overlapping portion. In the first embodiment, the upper frame 16 is formed of a tubular member having a circular cross section, but a tubular member having a rectangular cross section may be used.

Further, a headrest S3 is arranged above the upper frame 16. As described above, the headrest S3 is configured by providing the pad material 3a on the outer peripheral portion of the core material (not shown) and covering the outer peripheral portion of the pad material 3a with the skin material 3b. A pillar support portion 19a is provided 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), so that the headrest S3 can be attached. Although the example in which the seat back S1 and the headrest S3 are formed separately is shown in the first embodiment, 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 forming a part of the seat back frame 1 is an extension member forming the side surface of the seat back frame 1, and is a flat plate-shaped side plate 15a and a front end portion (front end portion) of the side plate 15a. It has a front edge portion 15b that is bent inward in a U shape from an end portion located on the front side of the vehicle) and folded back, and a trailing edge portion 15c that is bent inward in an L shape from the rear end portion.

The front edge portion 15b of the present embodiment is formed with a protrusion 15d projecting toward the trailing edge portion 15c, and the protrusion 15d is used to engage the tension coil spring 35 as an urging means. A locking hole as a locking portion is formed.
A moving member 30, which will be described later, is locked to the side frame 15 of the present embodiment. The configuration and operation of the moving member 30 will be described later.

<< 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 for supporting the cushion pad 1a from the rear is arranged 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 into a plate-like substantially rectangular shape, and smooth unevenness is formed on the surface on the side in contact with the cushion pad 1a. As shown in FIG. 2, claws for locking the wire 21 as the upper connecting member and the wire 22 as the lower connecting member are formed on the upper side and the lower side of the back side of the pressure receiving member 20. ..

The pressure receiving member 20 of this embodiment is supported by a connecting member. That is, two wires 21 and 22 as connecting members are erected between the side frames 15 on both sides, and the pressure receiving member 20 and the pressure receiving member 20 are formed by the claws formed at predetermined positions on the upper side and the lower side of the back side of the pressure receiving member 20. Engages and supports the pressure receiving member 20 on the back surface of the cushion pad 1a. The wires 21 and 22 are formed of a steel wire having a spring property, and an uneven portion which is a connecting portion is formed.

In particular, of the two wires 21 and 22 locked to the pressure receiving member 20 of the present embodiment, the wire 21 located above is composed of a wire thinner than the wire 22 located below. As a result, the pressure receiving member 20 is more likely to move backward in the upper part than in the lower part.

Further, since the wire 22 is made of a thick wire, it has high rigidity and is not easily deformed when seated normally. Therefore, during normal seating, the upper part of the pressure receiving member 20 supported by the wire 21 made of a thin wire easily moves backward, and the lower part of the pressure receiving member 20 supported by the wire 22 made of a thick wire does not move significantly backward. .. As a result, during normal seating, the upper part of the pressure receiving member 20 appropriately sinks backward, and the lower part supports the body of the occupant, so that the seating feeling is not impaired.

Further, the wires 21 and 22 are greatly deformed by a load equal to or more than a predetermined value (a load larger than the movable or rotating load of the impact reducing member described later) due to the formed uneven portions, and the number of the pressure receiving members 20 is increased. It is configured to move backward with the amount of movement of.

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 hung on the shaft branch 21a. On the other hand, both ends of the wire 22 locked to the lower side are hooked on the moving members 30 attached to the left and right side frames 15.

The wire 22 made of a wire rod thicker than the wire 21 is hard to be deformed as described above, and the lower portion of the pressure receiving member 20 is hard to move backward when seated normally. Therefore, the moving member 30 is attached to the end of the wire 22 in order to secure a sufficient amount of subduction at the time of a rear surface collision.

<< Configuration of moving member 30 >>
When a predetermined or greater impact load is applied to the pressure receiving member 20 due to a rear surface collision or the like, the moving member 30 as an impact reducing member moves to the rear of the vehicle due to the impact load transmitted through the connecting member (wire 22) and is also a pressure receiving member. 20 is moved backward, and the occupant is moved backward. In addition, "movement" refers to movement such as horizontal movement and rotation. In the present embodiment, the moving member 30 that rotates around the shaft portion 32 as a rotation shaft will be described. By moving the moving member 30 to the rear of the vehicle, the pressure receiving member 20 can be largely moved to the rear of the vehicle, and as a result, the occupant is moved to the rear, 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 rotatably supported inside the side plates 15a of the side frames 15 on both sides via a shaft portion 32 as a rotating shaft, and serves as a connecting member. The wire 22 at the lower position of the wire 22 is locked, and is connected to a spring (pulling 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 the pressure receiving member 20 is urged to the front side of the seat back frame 1 via the wire 22 as the connecting member.
Then, the moving member 30 of the present embodiment is shafted on the convex portion 15e formed by the rotatable shaft portion 32 so that the inside of the side frame 15, more specifically, a part of the side plate 15a bulges inside the seat. It is supported.

The above-mentioned moving member 30 is attached to the side frames 15 on both sides, and both ends of the wire 22 are hooked on the moving members 30 arranged on both sides, and each moving member 30 is individually attached. It is configured to work.
In the present embodiment, the moving members 30 are attached to the side frames 15 on both sides, and the moving members 30 attached to both sides are configured to move (rotate) independently of each other. Therefore, when the load is biased in the left-right direction, the moving members 30 attached to the side frames 15 on both sides move (rotate) independently according to the load, and the impact load is increased. Depending on the size, the occupant's body can be sunk backwards.

(Action and effect 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, tension is generated to move (rotate) the moving member 30 backward 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 is urged to move (rotate) the moving member 30 toward 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 the load region generated during normal seating, the moving member 30 is always stopped at the initial position. .. That is, the force for returning the moving member 30 to the initial state against the force for moving (rotating) the moving member 30 is configured to be the largest during normal seating.

The movement blocking portion 39 provided on the moving member 30 is a contact portion that contacts the trailing edge portion 15c of the side frame 15 after the moving (rotation) of the moving member 30 to prevent the movement (rotation). ..
The movement blocking 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 15 (more specifically, the trailing edge) after the contact surface moves (rotates). Since it comes into contact with the portion 15c), the movement (rotation) of the moving member 30 can be stably stopped even when an impact load of a predetermined value or more is applied to the pressure receiving member 20 due to a rear surface collision or the like.
The movement blocking portion 39 is formed at a position where it does not interfere with the urging means (pulling coil spring 35) or the connecting member (wire 22).

In the present embodiment, the movement blocking portion 39 of the moving member 30 is configured to directly contact the side frame 15 to prevent movement (rotation), but the movement blocking portion 39 and the side frame 15 In order to eliminate the abnormal noise generated at the time of contact, a sound deadening member such as a rubber having a thickness that does not hinder the stability of the movement (rotation) stop of the moving member 30 can be attached between the two. When configured to, stable movement (rotation) can be prevented and a muffling effect can be expected.

At all times, the moving member 30 abuts on the side frame 15 (more specifically, a portion of the convex portion 15e that is cut out) to suppress the upward force applied by the tension coil spring 35, and the moving member 30 moves. The range of movement (rotation) is limited so that it does not move (rotate) too much forward.

Then, at the time of a rear collision, when the occupant tries to move backward due to inertia, this load moves the moving member 30 backward (turns) 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 sufficient load for extending the tension coil spring 35 holding the moving member 30 in the initial position and moving (rotating) the moving member 30 backward.

The threshold value of the force at which the moving member 30 starts moving (rotating) is set to a value larger than the normal seating load.
Here, regarding the threshold value of the force at which the moving member 30 starts to move (rotate), the seat back S1 is set to the seat back S1 in a normally seated state (here, a small impact generated by a seating impact or a sudden start of a vehicle is excluded). Since the applied load is about 150 N, the threshold value is preferably a value larger than 150 N.

Further, it is preferable to set the value to a value larger than 250N in consideration of the seating impact generated during normal seating and the load generated during acceleration caused by a sudden start of a vehicle, and in this way, the moving member 30 is used except for a rear collision. Does not work and can maintain a stable state.

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

Since the moving member 30 has the moving (rotating) characteristics as described above with respect to the tension generated via the wire 22, the occupant can be seated back reliably and efficiently in the event of a rear surface collision. It can be submerged in the cushion pad of S1.
At this time, the back of the occupant moves backward by sinking into the seat back S1, but since the position of the headrest S3 does not change relative to the seat back S1, the gap between the headrest S3 and the occupant's head Can be shrunk and the headrest S3 can support the head, so that the impact applied to the neck can be effectively reduced.

In the present embodiment, an example in which the moving member 30 is provided on the left and right side frames 15 is shown, but the moving member 30 may be provided only on one side frame 15. In this case, the wires 21 and 22 can be directly locked to the side frame 15 on the side where the moving member 30 is not provided.

<< Configuration of lower frames 17 and 18 >>
The lower frame of the seat back frame 1 is composed of a lower frame base portion 17 and a lower frame erection portion 18. The lower frame erection portion 18 (member center) is formed so as to connect a pair of lower frame foundation portions 17 arranged apart from each other in the left-right direction, and is arranged in contact with the lower frame foundation portion 17. ing. The lower frame base portion 17 is connected to the lower side of the side plate 15a of the side frame 15. The lower frame base portion 17 is formed so as to extend below the side plate 15a, and is extended within a range that does not hinder the seating frame 2.
In the seat back frame 1 of the present embodiment, the side frame 15 and the lower frame base portion 17 are formed of separate members, but the seat back frame 1 may be formed of an integral plate-shaped frame or the like. Further, although the lower frame base portion 17 and the lower frame erection portion 18 are shown as separate members, they may be integrally formed.

(Structure of lower frame base 17)
As shown in FIG. 4, the lower frame base portion 17 has a side plate 17a as a frame side portion that is located on the left and right sides of the seat back frame 1 and extends in the vertical direction, and an inner side in the left-right direction from the side plate 17a. The connecting portion 17x, which is provided with an intermediate plate 17b as a frame extending portion extending toward the side and connects the side plate 17a and the intermediate plate 17b, has a hole portion 17k that deforms when an impact load is applied. It is formed. The "frame side portion" includes the side plate 15a of the side frame 15, and the "frame extension portion" also includes the trailing edge portion 15c of the side frame 15 and the lower frame erection portion 18. As an embodiment, an example in which a hole portion 17k is formed in the lower frame base portion 17 is shown.

The lower frame base portion 17 is formed by bending toward the inside of the side frame 15 substantially perpendicular to the side plate 17a joined to the side plate 15a of the side frame 15 and the rear end portion of the side plate 17a. It is formed by the intermediate plate 17b. A shaft insertion hole 17c through which the reclining shaft 11a is inserted is formed below the side plate 17a, and a seating frame 2 is arranged below the side plate 17a via the reclining mechanism 11.

Further, in the side plate 17a, a plurality of mounting holes 17d for mounting the lower frame base portion 17 to the side frame 15 are formed above the shaft insertion holes 17c. Below the side frame 15, a hole is provided at a position that matches the mounting hole 17d when the side plates 17a are overlapped, and the hole formed in the side frame 15 and the lower frame base portion 17 A joining means such as a bolt is penetrated so as to penetrate the mounting hole 17d, and the side frame 15 and the lower frame base portion 17 are joined. It is not necessary that all of the plurality of mounting holes 17d formed are fixed to the side frame 15, and a member other than the side frame 15 may be mounted.

Then, at least one of the side plate 17a or the intermediate plate 17b has fragile portions 17e and 17m connected to the hole portion 17k. In addition, in this specification, a "fragile part" means a part having a fragility that is deformed when an impact load of a predetermined size or more is applied such as at the time of a rear surface collision. In this embodiment, as shown in FIGS. 4 and 5, both the side plate 17a and the intermediate plate 17b are provided with fragile portions (inner fragile portion 17e and lateral fragile portion 17m). ..

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

When the occupant suddenly moves backward, such as during a rear collision, the inwardly fragile portion 17e is crushed in the vertical direction due to the impact load, and the lower frame base portion 17 is deformed so as to bend. With this deformation, the seat back frame 1 tilts backward. Therefore, it is preferable that the inner fragile portion 17e is formed on the lower frame base portion 17 provided below the side frame 15 among the members constituting the lower frame. The inner fragile portion 17e may be recessed so as to be recessed rearward as long as the lower frame base portion 17 can be sufficiently bent in order to absorb the impact energy at the time of a rear surface collision. Further, if the strength is sufficient to withstand a normal seating load, the inner fragile portion 17e may be easily deformed, so that only the thickness of the portion constituting the inner fragile portion 17e may be formed thin.

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

The horizontal portion 17f constituting the inner fragile portion 17e has a part of the inner fragile portion 17e (more specifically, the horizontal portion 17f) at the end portion on the side facing the bent portion 17g in the longitudinal direction thereof. It is cut out. This notched portion is a hole portion 17k, and the hole portion 17k and the inner fragile portion 17e are formed so as to be connected to each other. In this way, since the inner fragile portion 17e and the hole portion 17k are formed so as to be connected to each other, when an impact load such as a rear surface collision is applied to the lower frame base portion 17, as will be described below, The inner fragile portion 17e of the lower frame base portion 17 is deformed starting from the hole portion 17k to absorb impact energy.

The horizontal portion 17f can be bent and deformed so as to be crushed in the vertical direction when a predetermined impact load (a larger impact load than when seated normally) is applied to the seat back frame 1 such as a rear surface collision. (See FIG. 6). As a result, the backward tilt load can be absorbed stably and efficiently. Further, since the horizontal portion 17f extends in the seat width direction, that is, in 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 ridgeline portion. The rigidity of the lower 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 the boundary portion between the intermediate plate 17b and the side plate 17a, that is, the portion where the hole portion 17k is formed. In other words, the hole portion 17k is formed at the boundary portion between the intermediate plate 17b and the side plate 17a, that is, the connecting portion 17x. The hole portion 17k is formed so as to be deformed by an impact load smaller than that of the fragile portion (inner fragile portion 17e and lateral fragile portion 17m described later).

The lower 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 bending portion (connecting portion 17x) provides rigidity against a load in the vertical direction. It has. Therefore, depending on the magnitude of the impact load, the lower frame base portion 17 is less likely to be deformed in the vertical direction, and it may be difficult to efficiently absorb the impact energy. However, the hole portion 17k is formed at the boundary portion (connecting portion 17x) between the intermediate plate 17b and the side plate 17a, and when an impact load such as at the time of a rear surface collision is applied, the hole portion 17k becomes a fragile portion (inside). Since it is formed to be more easily deformed than the fragile portion 17e and the lateral fragile portion 17m described later), the hole portion 17k can be initially deformed so as to be crushed in the vertical direction. As a result, the upper part of the lower frame base portion 17 is deformed so as to be tilted backward, so that it is possible to efficiently absorb the energy of the backward tilt load.

In order to make the hole 17k more easily deformed than the fragile part (inner fragile part 17e and the side fragile part 17m described later) with respect to an impact load, for example, the width (size in the height direction) of the hole 17k ) Shall be formed at least equal to or slightly larger than the width of the horizontal portion 17f in the lateral direction (vertical direction). By forming the size of the hole portion 17k in the height direction equal to or larger than the width in the vertical direction of the horizontal portion 17f, when an impact load such as a rear surface collision is applied, the hole portion is ahead of the horizontal portion 17f. Since the hole portion 17k is easily deformed, the inner fragile portion 17e can be deformed starting from the hole portion 17k.

As described above, the inward fragile portion 17e includes an inclined portion 17h extending from the horizontal portion 17f via the bent portion 17g, and the inclined portion 17h is a side plate 17a, 17a of the intermediate plate 17b ( It extends to the vertical end of the portion sandwiched between the side plates 17a, 17a) provided on the pair of lower frame bases 17, 17. 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, the inclined portion 17h is bent so as to be inclined 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 extended in a horizontal linear shape consisting of only the horizontal portion 17f, but is provided with a bent portion 17g and is extended in a direction other than the substantially horizontal direction, that is, in an oblique direction. The rigidity of the lower frame base portion 17 is improved around the bent portion 17g and the inclined portion 17h by providing the configured portion (inclined portion 17h). Therefore, when a load is applied that causes the seat back frame 1 to tilt backward and deform due to a rear surface collision or the like, the horizontal portion 17f is particularly liable to be deformed, and 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.

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

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

Further, on the opposite side of the bent portion 17 g in the bending direction (lower in FIGS. 3 and 4), a harness mounting portion 17i as a bulging component mounting portion is formed. The harness mounting portion 17i is formed so as to bulge in the direction opposite to the bulging direction of the inward fragile portion 17e. That is, a harness mounting portion 17i is formed below the bent portion 17g so as to bulge rearward. In this way, in the intermediate plate 17b, the harness mounting portion 17i is formed on the side opposite to the bending direction of the bent portion 17g of the inward fragile portion 17e (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 lower frame base portion 17 with respect to the load (particularly, the rigidity in the vicinity of 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 the portion other than the inner fragile portion 17e. It can absorb impact energy.

In this way, the harness mounting portion 17i is formed by bulging behind the inward fragile portion 17e in the intermediate plate 17b, and does not bend any portion other than the inward fragile portion 17e when an impact load at the time of a rear collision is applied. It has a function as a reinforcing part. By improving the rigidity due to the uneven shape, the harness mounting portion 17i is restricted from being deformed backward, and it is possible to suppress the deformation of the seat back frame 1 from a portion other than the inner fragile portion 17e, and the seat back frame 1 It becomes easy to regulate the position of the deformed part and guide the deformation.
The harness mounting portion 17i is not above the bent portion 17g for the purpose of improving the rigidity below the intermediate plate 17b in order to make the side frame 15 particularly easy to tilt backward due to the impact load at the time of a rear surface collision. , It is preferable to provide it below.

Further, a plurality of mounting holes 17j are formed in the intermediate plate 17b. A joining means such as a bolt is inserted into the mounting hole 17j when mounting another member (actuator or the like) to the seat frame F.

By providing the harness mounting portion 17i and the mounting hole 17j in the intermediate plate 17b in this way, it is possible to save space in mounting other members and further reduce the number of parts. Further, since the harness mounting portion 17i has a function as a reinforcing portion provided behind the inner fragile portion 17e, it has a function of mounting parts and a function of a deformation guide that regulates the position of the deformed portion of the seat back frame 1. It can be combined and can contribute to the deformation of the seat back frame 1 while reducing the number of parts.

(Structure of lower frame erection part 18)
A lower frame erection portion 18 is joined to a side plate 17a or an intermediate plate 17b of a pair of lower frame base portions 17. It is preferable that the lower frame erection portion 18 is joined to both the side plate 17a and the intermediate plate 17b because the mounting rigidity is improved. Further, if the side end portion of the lower frame erection portion 18 is formed so as to abut against the side plate 17a, the rigidity is improved with respect to the lateral load. In the present embodiment, the lower frame erection portion 18 is arranged in front of the intermediate plate 17b, but may be arranged behind the intermediate plate 17b.

It is preferable that the inner fragile portion 17e is formed at a position that does not overlap with the lower frame erection portion 18 and is formed above the lower frame erection portion 18. As described above, if the inner fragile portion 17e is provided at a position that does not overlap with the lower frame erection portion 18, the inner fragile portion 17e is deformed when a load in the backward tilting direction is applied to the seat back frame 1. Is not hindered by the lower frame erection portion 18, which is preferable. In other words, the lower frame erection portion 18 is provided at a position that does not overlap with the inner fragile portion 17e below the inner fragile portion 17e, and a load in the direction of tilting backward at the time of a rear collision is applied to the seat back frame 1. At that time, it functions as a reinforcing portion for increasing the rigidity of the lower portion of the inner fragile portion 17e. Therefore, it is possible to prevent the lower frame base portion 17 from bending from a portion other than the fragile portion, and it is possible to easily regulate the position of the deformed portion of the seat back frame 1 and guide the deformation.

Further, the fragile portion is formed on the side plate 17a and the side fragile portion 17 m formed between the seating frame 2 (more specifically, the side frame provided in the seating frame 2) and the side frame 15. Have. That is, the lower frame base portion 17 disposed between the seating frame 2 and the side frame 15 includes a side fragile portion 17 m on the side plate 17a. The lateral fragile portion 17m is formed at substantially the same height as the inner fragile portion 17e formed on the intermediate plate 17b, and the hole portion formed at the boundary portion between the side plate 17a and the intermediate plate 17b. It extends horizontally from 17k to the front side. Then, on the side plate 17a, the lateral fragile portion 17m extending from the hole portion 17k extends to substantially the center in the front-rear direction of the side plate 17a.

Similar to the inward fragile portion 17e, the lateral fragile portion 17m has a substantially semicircular cross section and is recessed so as to be recessed from the inside toward the outside in the left-right direction (seat width direction) of the side frame 15. The lateral fragile portion 17m is formed so as to extend substantially linearly from the rear to the front. In other words, the lateral fragile portion 17m is a recess extending in the front-rear direction and formed below the side frame 15.

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

The inner fragile portion 17e and the lateral fragile portion 17m are formed by performing press working or the like on the lower frame base portion 17. Further, the hole portion 17k may be formed by cutting after forming the inner fragile portion 17e and the lateral fragile portion 17m on the lower frame base portion 17, or after forming the hole portion 17k in advance, the inner fragile portion 17k may be formed. The fragile portion 17e and the lateral fragile portion 17m may be formed.

(Action and effect of lower frame base 17)
The state in which the lower frame base portion 17 is deformed when an impact load at the time of a rear surface collision is applied will be described below with reference to FIGS. 7 and 8.
FIG. 7 shows a state immediately after the impact load at the time of the rear surface collision is applied to the lower frame base portion 17. At this time, a load is mainly applied to the seat back frame 1 in the direction of tilting backward, but the largest load is applied to the lower side of the side frame 15, that is, the lower frame base portion 17.

Then, when the load is transmitted to the lower frame base portion 17, the lateral fragile 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 is formed. 17a is deformed so as to spread outward in the sheet width direction. In this way, by providing the hole portion 17k and further providing the side fragile portion 17m on the side plate 17a, the side plate 17a spreads outward in the sheet width direction as compared with the case where the hole portion 17k is not provided. 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 inward fragile portion 17e (more specifically, the horizontal portion 17f) formed on the intermediate plate 17b is crushed in the vertical direction. As a result, the side frame 15 provided above the lower frame base portion 17 is tilted backward, and the seat back frame 1 is deformed as described above (see FIGS. 5 and 6).

In this way, the lower frame base portion 17 is provided with not only the inner fragile portion 17e and the hole portion 17k but also the side fragile portion 17m, so that the lower frame base portion 17 is stepwise starting from the hole portion 17k. It can be easily deformed and can efficiently absorb impact energy. In the event of a rear collision, a complicated input load is applied to the seat back frame 1, but by providing the above configuration, a specific location (specifically, the horizontal portion 17f of the inner fragile portion 17e) is stably deformed. Can be made to. As a result, the impact energy at the time of the rear surface collision can be efficiently absorbed by the lower frame base portion 17.

Further, 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 surface collision or the like. Since the bent portion 17g and the inclined portion 17h are formed in the inner fragile portion 17e of the lower frame (more specifically, the lower frame base portion 17), the intermediate plate 17b has an appropriate rigidity. Therefore, since the pressure receiving member 20 can easily sink the occupant's body relative to the side frame 15 and the upper frame 16, the impact energy due to the rear surface collision or the like is efficiently transmitted to the seat back frame 1 and absorbed. Is possible.
As a result, the inner fragile portion 17e and the lateral fragile portion 17m formed on the lower frame base portion 17 can be deformed, and the impact energy can be absorbed more efficiently.

Next, the vehicle seat according to the second embodiment of the present invention will be described with reference to FIGS. 9 to 12. 9 to 12 are related to the second embodiment of the present invention, FIG. 9 is a schematic perspective view of a vehicle seat, FIG. 10 is a partially enlarged explanatory view of a lower frame erection portion and a frame side portion, and FIG. Is a partial cross-sectional view of the lower frame, and FIG. 12 is a rear view of the seat frame. In the second embodiment, the same members, arrangements, and the like as those in the first embodiment described above are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIGS. 9 to 11, the lower frame erection portion 58 of the vehicle seat S according to the present embodiment is formed by bending one plate body into a substantially hollow prismatic shape, and bulges forward. It has at least a front bulging portion 58a, a rear surface 58b facing the front bulging portion 58a, and a connecting surface 58c connecting the front bulging portion 58a and the rear surface 58b. The lower frame erection portion 58 of the present embodiment is arranged so that the front bulging portion 58a bulges forward of the reclining shaft 11a and covers the reclining shaft 11a from the front.

In the lower frame erection portion 58 of the present embodiment, the rear surface 58b arranged on the rear side facing the front bulging portion 58a is joined to the intermediate plate 17b of the lower frame foundation portion 17, so that the lower frame foundation portion 17 Is connected with. The connection between the rear surface 58b and the lower frame base portion 17 may be made by any method such as welding or fixing with a fixing tool such as a screw or a screw.

The lower frame erection portion 58 is arranged at a position corresponding to the waist portion of the occupant when the occupant is seated, and is arranged in front of the inner fragile portion 17e as shown in FIG. Therefore, the lower frame erection portion 58 receives an impact load applied from the waist of the occupant via the cushion pad 1a and the skin material 1b placed on the seat back frame 1 at the time of a rear surface collision from the intermediate plate 17b of the lower frame base portion 17. Also receives in front and has a function as a reinforcing portion for reinforcing the rigidity of the lower frame base portion 17 against an impact load.

When the reinforcing portion is provided in front of the fragile portion in this way, the input of the load from the front to the portion of the seat back frame 1 that overlaps the reinforcing portion in the front-rear direction is restricted, and from a portion other than the fragile portion. It is possible to suppress the occurrence of deformation. Therefore, when an impact load is applied from the front, it is possible to suppress the deformation of the seat back frame 1 from a portion other than the fragile portion, and it is easy to regulate the position of the deformed portion of the seat back frame 1 and guide the deformation. It becomes.

As shown in FIGS. 10 and 11, the lower frame erection portion 58 as the reinforcing portion has a position where the rear surface 58b, which is a joint surface with the intermediate plate 17b, does not overlap with the inward fragile portion 17e in the front-rear direction. It is attached and arranged below the inner fragile portion 17e. Further, the upper end 58e of the rear surface 58b is arranged below the horizontal portion 17f so as to extend in the horizontal portion 17f of the inward fragile portion 17e, that is, along the longitudinal direction (seat width direction) of the lower frame erection portion 58. ing.

Since the rear surface 58b of the lower frame erection portion 58 is provided at a position where it does not overlap with the inward fragile portion 17e in the front-rear direction, the inward fragility that occurs when a rear impact load is applied to the seat back frame 1. The deformation of the portion 17e is not hindered by the lower frame erection portion 58.
Further, since the rear surface 58b is attached to the portion of the intermediate plate 17b below the inner fragile portion 17e and the lower frame erection portion 58 is provided, the portion other than the inner fragile portion 17e, in the present embodiment, The lower part of the inner fragile portion 17e is reinforced by the rear surface 58b to improve the rigidity. Therefore, when a rear impact load is applied to the seat back frame 1, it is possible to suppress the deformation of the seat back frame 1 from a portion other than the inward fragile portion 17e, and the position of the portion where the deformation of the seat back frame 1 occurs. Regulation is easy.
Further, since the upper end 58e of the rear surface 58b is provided along the extending direction of the horizontal portion 17f of the inner fragile portion 17e, the direction in which the seat back frame 1 is deformed and the guide of the deformed shape become easier.

Further, one end of the front bulging portion 58a, in the present embodiment, the corner portion 58g where the upper end 58d of the front bulging portion 58a and the side end portion (left end portion in FIG. 10) 58f intersect is the hole portion 17k. It is arranged at a position where it overlaps with the boundary portion 17p between the inner fragile portion 17e and the horizontal portion 17f in the front-rear direction.

The hole 17k and the inner fragile portion 17e are connected via a boundary portion 17p, and when an impact load due to a rear collision is applied, the hole 17k is first deformed, and the inner fragile portion 17e starts from that. Impact energy is transmitted to. Therefore, in order to efficiently transfer the impact energy to the inner fragile portion 17e, it is necessary that the deformation of the hole portion 17k is not hindered and that the hole portion 17k is deformed in a desired direction.

Like the front bulging portion 58a of the present embodiment, the corner portion 58g as one end portion is provided at a position where the boundary portion 17p between the hole portion 17k and the horizontal portion 17f of the inward fragile portion 17e overlaps in the front-rear direction. As a result, the deformation of the hole portion 17k due to the impact load is not hindered, and the direction of deformation of the hole portion can be defined even for a complicated input load. The corner portion 58g, which is one end portion, may at least overlap with the boundary portion 17p, and has the same effect as being arranged at a position overlapping the hole portion 17k in the front-rear direction in the region including the boundary portion 17p. can get.

The left and right side end portions 58f of the front bulging portion 58a of the present embodiment are provided apart from the side plates 17a of the lower frame base portion 17, and are not fixed to the side portions of the seat back frame 1. It has become. Although only the side end portion 58f on the left side of the front view of the vehicle seat S is shown in FIG. 10, the side end portion on the right side also has the same configuration. As described above, the structure in which the front bulging portion 58a is not connected to the side plate 17a does not increase the rigidity of the reinforcing portion too much and does not affect the deformation of the seat back frame 1 due to the impact load.

As shown in FIG. 11, the upper end 58d of the front bulging portion 58a is the center (center) of the width (length in the height direction) of the lateral fragile portion 17m formed on the side plate 17a of the lower frame base portion 17. It is provided at a position below the line) and partially overlapping the lateral fragile portion 17 m in the vertical direction.
When an impact load such as a rear collision is applied, the lateral fragile portion 17m is deformed so as to collapse in the vertical direction, so that the upper end 58d of the front bulging portion 58a is the width (length in the height direction) of the lateral fragile portion 17m. If it is provided below the center of the above), it does not interfere with the lateral fragile portion 17 m at the time of deformation and is suitable without hindering the deformation of the lateral fragile portion 17 m.

Further, since the upper portion of the lower frame erection portion 58, that is, the upper end 58d of the front bulging portion 58a is disposed at a position where it partially overlaps with the lateral fragile portion 17m in the left-right direction, the upper end 58d of the front bulging portion 58a is arranged. Compared with the case where the lower frame erection portion 58 is arranged so as to be arranged downward at a distance from the lateral fragile portion 17 m, it is possible to suppress an increase in the vertical length of the seat side portion, and the seat back. The frame 1 can be miniaturized.

The width (length in the height direction) of the lateral fragile portion 17m is formed to be smaller than the width in the lateral direction of the horizontal portion 17f constituting the inward fragile portion 17e. Further, the lateral fragile portion 17m has a center (center line) of its width (length in the height direction) from the center (center line) of the horizontal portion 17f of the inward fragile portion 17e in the lateral direction (vertical direction). Is also located below, and its width is formed so as to be within the width of the horizontal portion 17f in the lateral direction. By arranging in this way, when an impact load due to a rear surface collision is applied, the hole portion 17k is first deformed so as to be crushed in the vertical direction, and then the lateral fragile portion 17m is deformed in the vertical direction before the horizontal portion 17f. It can move downward while being deformed so as to be crushed, and can efficiently transmit impact energy to the horizontal portion 17f. By forming the horizontal portion 17f and the lateral fragile portion 17m at appropriate positions in this way, impact energy can be stably absorbed.

In the present embodiment, the reinforcing portion is provided below the inner fragile portion 17e, which is the portion where the seat back frame 1 is deformed (bent), but the positional relationship between the deformed portion and the reinforcing portion is as follows. The reinforcing portion may be provided above the portion where the deformation occurs. In this way, even if the reinforcing portion is arranged at a position above the portion where the deformation occurs and does not overlap in the front-rear direction, the position of the portion where the deformation occurs can be easily regulated.

Next, the action of the front bulging portion 58a and the moving member 30 at the time of a rear surface collision will be described.
The front bulging portion 58a of the present embodiment is arranged at a position corresponding to the lumbar portion of the occupant when the occupant is seated, and is configured to bulge toward the lumbar portion of the occupant. Therefore, the front bulging portion 58a has a function as a lumbar entry obstructing member that prevents the occupant's lumbar portion from moving backward at the time of a rear surface collision.

At the time of a rear collision, when the occupant receives an impact, the occupant suddenly moves backward, and the occupant's waist abuts on the front bulging portion 58a to prevent the occupant from moving backward. As a result, the entire upper body of the occupant tilts (rotates) backward, and the upper part of the upper body moves further backward and sinks into the seat back S1. Then, the load due to the rearward movement of the occupant is applied to the pressure receiving member 20, and tension is applied in the direction of moving (rotating) the moving member 30 rearward via the wire 22 locked to the pressure receiving member 20, and the moving member 30 is moved. Move backwards. Due to the movement of the moving member 30, the pressure receiving member 20 moves significantly rearward, so that the amount of subduction of the occupant increases and the impact load is absorbed.

Since the moving member 30 is provided on the side frame 15 above the position where the hole 17k and the fragile portion (inner fragile portion 17e, lateral fragile portion 17m) are provided, the moving member 30 is located above the hole 17k and the fragile portion. The impact load is applied upward, and the impact load due to the deformation of the seat back frame 1 can be absorbed.
In this way, the impact load can be absorbed by the action of the moving member 30, and the impact load can be absorbed by the action of the hole 17k and the fragile portion, so that the impact load can be absorbed more efficiently.

In the second embodiment described above, an example is shown in which the lower frame erection portion 58 is provided in front of the fragile portion as a reinforcing portion, but the arrangement of the reinforcing portion is not limited to this, and the reinforcing portion is provided behind or in front of the fragile portion. It can also be arranged rearward.
FIG. 12 is a rear view of the seat frame showing another example of the reinforcing portion according to the second embodiment. As shown in FIG. 12, in this example, a plate-shaped reinforcing member 59 as a reinforcing portion is provided behind the lower frame (lower frame base portion 17 and lower frame erection portion 18 or 58). The reinforcing member 59 is provided at a position that does not overlap the inner fragile portion 17e in the front-rear direction and is provided below the inner fragile portion 17e, and the upper end 59a is in the extending direction of the horizontal portion 17f, that is, the lower frame erection portion 18 Alternatively, it is arranged along the longitudinal direction (seat width direction) of 58.

When the reinforcing member 59 is provided behind the inner fragile portion 17e in this way, when an impact load is applied, the rearward deformation of the portion of the seat back frame 1 that overlaps with the reinforcing member 59 in the front-rear direction is restricted. It is possible to suppress the deformation of the seat back frame 1 from a portion other than the fragile portion. Therefore, it becomes easy to regulate the position of the deformed portion of the seat back frame 1 and guide the deformation.

As described above, according to the vehicle seat according to the second embodiment, the seat back frame is stably deformed at a specific location and is easily deformed with respect to a complicated input load at the time of a rear surface collision. The rigidity of the portion other than the portion can be improved to facilitate the position regulation of the deformed portion, and the deformation can be easily guided. Therefore, even if a complicated input load is applied at the time of a rear collision, the impact energy can be efficiently and stably absorbed.

In each of the above embodiments, the seat back S1 of the front seat of the automobile has been described as a specific example, but the present invention is not limited to this, and it goes without saying that the same configuration can be applied to the seat back of the rear seat.

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 Side frame 15a Side plate (frame side)
15b Front edge 15c Trailing edge (frame extension)
15d Protruding part 15e Convex part 16 Upper frame 16a Side part 17 Lower frame base part (lower frame)
17a side plate (frame side)
17b Intermediate plate (frame extension)
17c Shaft insertion hole 17d, 17j Mounting hole 17e Inner fragile part (fragile part)
17f Horizontal part 17g Bending part 17h Inclined part 17i Harness mounting part (parts mounting part, reinforcement part)
17k hole 17m lateral fragile part (fragile part)
17p Boundary part 17x Connecting part 18 Lower frame erection part (frame extension part, lower frame, reinforcing part)
19 Headrest pillar 19a Pillar support 20 Pressure receiving member 21 Wire (connecting member, upper connecting member)
21a Shaft branch 22 wire (connecting member, lower connecting member)
30 Moving member (impact reduction member)
32 Shaft 35 Tension coil spring (urging means)
39 Movement blocking part 58 Lower frame erection part (frame extension part, lower frame, reinforcing part)
58a Front bulge 58b Rear surface 58c Connecting surface 58d, 58e Upper end 58f Side end 58g Square 59 Reinforcing member 59a Upper end

Claims (11)

It is provided with a frame side portion that is located on the left and right sides of the seat back frame and extends in the vertical direction, and a frame extension portion that extends inward in the horizontal direction from the frame side portion.
A vehicle seat characterized in that a hole portion that deforms when an impact load is applied is formed in a connecting portion that connects the frame side portion and the frame extension portion. The vehicle seat according to claim 1, wherein at least one of the frame side portion and the frame extension portion has a fragile portion connected to the hole portion. The vehicle seat according to claim 2, wherein the hole portion is formed so as to be deformed by an impact load smaller than that of the fragile portion. The fragile portion has an inward fragile portion formed in the frame extension portion and has an inner fragile portion.
The inner fragile part is
A horizontal part that extends along the horizontal direction,
A bent portion formed on one end side in the longitudinal direction of the horizontal portion,
An inclined portion extending from the bent portion is provided.
The vehicle seat according to claim 2 or 3, wherein the inclined portion extends to a vertical end portion of a portion of the frame extending portion sandwiched between the frame side portions. The vehicle seat according to claim 4, wherein the inwardly fragile portion is formed of a concave portion recessed forward. The vehicle seat according to any one of claims 2 to 5, wherein a reinforcing portion is provided on at least one of the upper side and the lower side of the fragile portion. The vehicle seat according to claim 6, wherein the reinforcing portion is provided at least one of the front side and the rear side of the fragile part. 6. Vehicle seat. The vehicle seat according to any one of claims 4 to 8, wherein a bulging component mounting portion is formed on the opposite side of the bent portion in the bending direction. A bulging component mounting portion is formed on the opposite side of the bent portion in the bending direction.
The vehicle seat according to claim 7, wherein the reinforcing portion provided behind the fragile portion is the article mounting portion. A seating frame is further provided below the seat back frame.
The seat back frame has side frames located on the left and right, and has side frames.
The fragile portion according to any one of claims 2 to 10, wherein the fragile portion has a lateral fragile portion formed on the side portion of the frame and formed between the seating frame and the side frame. The vehicle seats listed.