JP5823173B2 - Vehicle seat - Google Patents

Description

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

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

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

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

Japanese Patent No. 4200580

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

  Therefore, the present applicant relates to a technology for absorbing impact energy by deforming a seat back frame, and when impact energy is applied, such as at the time of a rear collision, by forming a flexible constricted portion in the lower frame. A technology for preferentially bending the constricted portion and efficiently absorbing impact energy has been proposed (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, when the seat back frame is deformed to tilt backward, depending on the magnitude of impact energy applied, the angle of backward tilting becomes too large, and the seating posture of the occupant changes and the seating feeling is changed. There was a problem that it might be damaged.
Therefore, as described above, 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 regulate the amount of deformation (backward tilt angle) of a vehicle seat that absorbs impact energy by bending and deforming the seat when impact energy is applied at the time of collision, particularly at the time of rear-end collision. An object of the present invention is to provide a vehicle seat that can be used. Another object of the present invention is to reduce the influence on the seating posture of the occupant by controlling the amount of deformation of the seat when impact energy is applied in the event of a collision, particularly at the time of a rear collision. Is to provide.

According to the vehicle seat of the present invention, the problem is that the lower frame disposed below the seat back frame, the fragile portion that is deformed when an impact load is applied , and a position that sandwiches a portion of the fragile portion. And a restricting portion that restricts the amount of deformation of the fragile portion, and the lower frame is located on the left and right sides and extends in the up and down direction, and the frame side portions in the left and right direction A frame extending portion extending inward, and the weakened portion includes a first weakened portion formed at a connecting portion connecting the frame side portion and the frame extending portion, and the first weakened portion. A second weakened portion connected to the first weakened portion and formed in the frame extending portion, and the first weakened portion is deformed by an impact load smaller than that of the second weakened portion. It is solved by being formed in this way .

As described above, the vehicle seat includes a fragile portion that is deformed when an impact load is applied, so that when the vehicle seat is subjected to an impact load such as a rear collision, the vehicle seat starts from the fragile portion. A part is deformed and can absorb impact energy.
And since the restriction part which opposes the position which pinches | interposes a weak part is formed so that the deformation amount of a weak part may be controlled, if a weak part deform | transforms to a fixed position (shape), the opposing restriction part will contact. As a result, the fragile portion is pressed against further deformation. Therefore, the deformation amount of the fragile portion does not become larger than a certain value, and as a result, the deformation amount of the sheet can be regulated (controlled) so as to become a certain value or less.
Further, as described above, when an impact load is applied, the amount of deformation of the seat is regulated so as not to become too large, so that the influence on the seating posture of the occupant is reduced.

Further , the first weak portion is formed at a 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. Thus, when an impact load such as a rear collision is applied, the seat back frame can be easily bent backward and deformed. In the seat back frame, the connecting portion between the frame side portion and the frame extending portion has high rigidity with respect to a load along the extending direction (vertical direction) of the connecting portion. When a collision impact load is applied, the connecting portion is difficult to bend. However, by providing the first weakened portion deformed by the impact load in the connecting portion, when the impact load is applied, the first weakened portion and further the second weakened portion connected to the first weakened portion. The seat back frame bends in the vertical direction starting from that and is easily deformed. Therefore, when an impact load is applied, the seat back frame can be bent stably starting from the first fragile portion and the second fragile portion, and the impact energy can be absorbed efficiently.
Further, since the first weakened portion is provided in a portion having high rigidity such as the connecting portion, the bent portion is limited to the vicinity of the first weakened portion as compared with the case where the first weakened portion is formed in the other portion. can do.

Since the first fragile portion is formed more easily than the second fragile portion with respect to the impact load, the first fragile portion is deformed first when the impact load is applied. The two weak parts can be deformed. Although a complicated input load is applied to the vehicle seat at the time of a rear collision or the like, the first fragile portion is deformed first by providing the first fragile portion that is more easily deformed than the second fragile portion. The second fragile portion connected to the first fragile portion is deformed. As a result, the deformation (bending) position and the bending deformation (bending) position of the seat back frame can be limited.
That is, by setting it as the said structure, when an impact load is added, a deformation | transformation of a 1st weak part can be accelerated | stimulated and a 2nd weak part can be deformed from a 1st weak part. Therefore, when the impact load is applied to the vehicle seat, the second fragile portion is deformed, and the impact energy can be stably absorbed.

Further, according to the vehicle seat of the present invention, the problem is that a lower frame disposed below the seat back frame, a fragile portion that deforms when an impact load is applied, and a part of the fragile portion. A restricting portion that is disposed at a sandwiching position and restricts the deformation amount of the fragile portion, and the lower frame is located on the left and right sides and extends in the up-down direction, and the frame side portions from the left and right sides A frame extending portion extending inward in the direction, and the weakened portion is a first weakened portion formed in a connecting portion that connects the frame side portion and the frame extending portion; A third fragile portion connected to the first fragile portion and formed on a side of the frame, wherein the first fragile portion is deformed by an impact load smaller than that of the third fragile portion. It is solved by being formed to do.

With the above configuration , the first fragile 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 By forming the seat back frame, it is possible to easily bend and deform the seat back frame backward when an impact load such as a rear collision is applied. In the seat back frame, the connecting portion between the frame side portion and the frame extending portion has high rigidity with respect to a load along the extending direction (vertical direction) of the connecting portion. When a collision impact load is applied, the connecting portion is difficult to bend. However, by providing the first weakened portion deformed by the impact load in the connecting portion, when the impact load is applied, the first weakened portion and further the first weakened portion are connected to the side surface of the seat back frame. The third fragile portion formed in the shape is deformed, and the seat back frame is bent in the vertical direction and rearward from that as a starting point, and is easily deformed.
Moreover, since the 3rd weak part is formed in the side surface of a seat back frame, when a back inclination load is added to the seat back at the time of a rear surface collision, especially a seat back can be bent stably.
Therefore, when an impact load is applied, the seat back frame can be bent stably from the first fragile portion and the third fragile portion as a starting point, and the impact energy can be efficiently absorbed.
Furthermore, since the first fragile portion is provided in a highly rigid portion such as the connecting portion, the bent portion is limited to the vicinity of the first fragile portion as compared with the case where the first fragile portion is formed in the other portion. can do.

In addition , the first fragile portion is formed more easily than the third fragile portion with respect to the impact load, so that the first fragile portion is deformed first, and then the third fragile portion is deformed. Can be made. Accordingly, since the order of deformation can be set, it is possible to facilitate the deformation by promoting the deformation of a specific portion.

Further, the fragile portion, the first and a second weak portion which is formed on said frame extending portion while being connected to the fragile portion, and the front Symbol first weak portion, said second weak And at least one of the third fragile portion and the third fragile portion, the first fragile portion, the second fragile portion, and the third fragile portion. Are preferably formed at the same height.
Thus, when the first fragile portion, the second fragile portion, and the third fragile portion are all formed at the same height, when the impact load is applied, the fragile portions provided at these three locations are bent. By doing so, the seat back frame is deformed and can be bent stably. Therefore, it is possible to absorb impact energy stably.
And since all these weak parts are formed in the same height, the control part should just be provided in the position which pinches | interposes at least 1 weak part. Since all of the above-mentioned weak parts are provided at the same height, when an impact load is applied, the deformation amount of the other weak parts can be controlled by the restriction part provided at one place.

At this time, the front Symbol regulating unit, wherein it fragile portion facing positions sandwiching a by a regulating surface which is disposed from the first regulating portion and a second regulating portion each having said first restricting portion Preferably, the restriction surface provided on at least one of the second restriction portions is formed in a flat shape.
In this way, in the first restricting portion and the second restricting portion that are opposed so as to sandwich the fragile portion, at least one of the restricting portions of the opposing surfaces, that is, the restricting surfaces, is planar. By forming, when the weak part deform | transforms, the other control part becomes easy to contact | abut. As a result, it becomes easier to accurately control the deformation amount of the fragile portion, and it becomes easier to stably regulate the deformation of the fragile portion.
Further, the restricting portion includes two opposing portions formed at positions sandwiching the fragile portion, and a distance between the two facing portions is smaller than a width of the fragile portion in a direction sandwiched by the restricting portion. The fragile portion is formed of a groove, and a part of the restricting portion is arranged at a position overlapping the groove.
As described above, the distance between the two opposing portions formed at the position where the fragile portion is sandwiched in the restricting portion is formed to be smaller than the width of the fragile portion (the width in the direction sandwiched by the restricting portion). When the impact load is applied and the fragile portion is deformed, the opposing portions of the restricting portion easily come into contact with each other. When the distance between the opposing portions is formed larger than the width of the fragile portion or approximately the same size, the deformation (bending) of the fragile portion is caused by the restricting portion when the impact load is particularly large. The fragile portion may be completely bent before being pressed down, and it is difficult to regulate the deformation amount (bending amount). However, with the above configuration, the deformation is restrained by the restricting portion before the fragile portion is completely deformed (bent), and the deformation amount of the fragile portion is more accurately regulated (controlled) to a certain value or less. can do.
Further, depending on the distance between the opposing portions of the restricting portion, the timing at which the restricting portions contact each other can be set.

According to the present invention, the vehicular seat includes the fragile portion that deforms when an impact load is applied, and the restriction portion that regulates the deformation amount of the fragile portion, so that the deformation amount of the seat is larger than a predetermined value. It can be regulated not to become. Further, by controlling the deformation amount of the seat, it is possible to reduce the influence on the seating posture of the occupant . The seat back frame includes a first weakened portion at a connecting portion between the frame side portion and the frame extending portion, and further includes a second weakened portion connected to the first weakened portion in the frame extending portion. Thus, at the time of a rear collision, the seat back frame is deformed starting from the first fragile portion and the second fragile portion, and a vehicle seat capable of stably absorbing impact energy can be obtained . By forming the first fragile portion more easily than the fragile portion, it is possible to bend the first fragile portion first and then bend the second fragile portion when an impact load is applied. . Therefore, the bending position and bending position of the seat back frame can be limited, and impact energy can be stably absorbed.
According to the present invention, in the seat back frame, the connecting portion between the frame side portion and the frame extension portion includes the first weakened portion, and the third weakened portion connected to the first weakened portion is further provided on the frame side. by providing separate component, during a rear-end collision, the first weak portion and the third weak portion seat back frame is deformed starting, stable impact energy can be made absorbable vehicle seat and, also By forming the first fragile portion more easily than the third fragile portion, the first fragile portion is bent first when an impact load is applied, and then the third fragile portion is bent. be able to. Therefore, the bending position and bending position of the seat back frame can be limited, and impact energy can be stably absorbed.
According to the present invention, since the fragile portions formed at the three locations are all formed at the same height, when the impact load is applied, the seat back frame is stably deformed, and as a result, the impact is stably It can absorb energy.
According to the present invention, by forming at least one of the opposing surfaces provided in the opposing first restricting portion and the second restricting portion, that is, the opposing restricting surfaces, in a stable manner, The amount of deformation can be controlled.
According to the present invention, since the width between the opposing portions of the restricting portion is formed smaller than the width of the fragile portion, the fragile portion is deformed by the restricting portion before the fragile portion is completely deformed (bent). Since it is held down, the deformation amount of the fragile portion can be accurately controlled.

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 lower 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 lower frame base part which concerns on one Embodiment of this invention. It is explanatory drawing which shows the state before the rear surface collision of the lower frame which concerns on one Embodiment of this invention. It is explanatory drawing which shows the state after the rear surface collision of the lower frame which concerns on one Embodiment of this invention. It is explanatory drawing of the lower frame base part which concerns on other embodiment of this invention. It is explanatory drawing of the lower frame base part which concerns on other embodiment of this invention. It is explanatory drawing of the lower frame base part which concerns on other embodiment of this invention. It is explanatory drawing of the lower frame base part 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. The impact energy at the time of rear collision is energy due to a large load generated at the time of rear collision, which is caused by a large rear collision by a vehicle from the rear side, a large collision at the time of reverse traveling, etc. It does not include energy due to the load in the load region similar to the load.
Moreover, the left-right direction means the left-right direction in a state of facing the front of the vehicle, and is a direction that coincides with the width direction of the seat back frame 1 described later. In addition, the front-rear direction is a thing that means the front-rear direction in a state where an occupant is seated.

  1 to 8 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. FIG. 5 is a cross-sectional view taken along line AA of FIG. 4, FIG. 6 is an explanatory view showing a state after the rear collision of the lower frame base, and FIG. 7 is a diagram before the rear collision of the lower frame. FIG. 8 is an explanatory view showing a state after a rear surface collision of the lower frame. FIGS. 9 to 12 relate to another embodiment of the present invention and are explanatory views of a lower frame base.

<< Basic configuration of vehicle seat S >>
With reference to FIG. 1 thru | or FIG. 8, the vehicle seat S which concerns on embodiment is demonstrated.
As shown in FIG. 1, the vehicle seat S includes a seat back S <b> 1 (back portion), a seating portion S <b> 2, and a headrest S <b> 3. The seat back S <b> 1 (back portion) and the seating portion S <b> 2 , 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 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 pair of lower frame base portions 17 (member sides) are provided so as to be projected from the shaft insertion holes 17c (see FIGS. 4 to 6) provided on the side 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, as shown in FIG. 2, the seat back frame 1 is a substantially rectangular frame, and includes a side frame 15, an upper frame 16, a lower frame base portion 17, and a lower frame installation portion 18. And.

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

  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 surface portion 16a of the upper frame 16 is disposed so as to partially overlap the side plate 15a of the side frame 15 along the vertical direction, and is fixedly joined to the side frame 15 at the overlapping portion. In the first 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 above 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 first embodiment, an example in which the seat back S1 and the headrest S3 are separately formed has been described. However, a bucket type in which the seat back S1 and the headrest S3 are integrally formed may be used.

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

The front edge 15b of the present embodiment is formed with a protrusion 15d that protrudes toward the rear edge 15c, and this protrusion 15d is used to lock a tension coil spring 35 as a biasing means. A locking hole as a locking portion is formed.
And the below-mentioned moving member 30 is latched by the side frame 15 of this 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 that supports the cushion pad 1a from the rear is disposed in the inner region of the seat back frame 1.

  The pressure receiving member 20 of the present embodiment is a member in which resin is formed in a plate-like substantially rectangular shape, and smooth unevenness is formed on the surface in contact with the cushion pad 1a. As shown in FIG. 2, claw portions for locking the wire 21 as the upper connecting member and the wire 22 as the lower connecting member are formed on the upper and lower sides of the pressure receiving member 20. .

  The pressure receiving member 20 of this embodiment is supported by the connecting member. That is, two wires 21 and 22 as connecting members are laid between the side frames 15 on both sides, and the pressure receiving member 20 is connected to the pressure receiving member 20 by the claw portions formed at predetermined positions on the upper side and the lower side of the pressure receiving member 20. The pressure receiving member 20 is engaged and supported on the back surface of the cushion pad 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 the present embodiment, both ends of the wire 21 locked to the upper side are provided on the side frames 15 on both sides. It is hooked on the supported shaft 21a. On the other hand, both ends of the wire 22 locked to the lower side are hooked to a moving member 30 mounted on the left and right side frames 15.

  The wire 22 made of a wire thicker than the wire 21 is not easily deformed as described above, and the lower portion of the pressure receiving member 20 is difficult to move backward during normal seating. Therefore, the moving member 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 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 in the lower position of the wire is locked and is connected to a spring (a tension coil spring 35) as a biasing means for biasing 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 is configured so that a pivotable shaft portion 32 is pivoted on a convex portion 15e formed by bulging a part of the side plate 15a on the inner side of the side frame 15 and more specifically on the inner side of the seat. It is supported.

The moving members 30 described above are attached to the side frames 15 on both sides, and both ends of the wire 22 are hooked on the moving members 30 arranged on both sides, respectively. It is configured to operate.
In this embodiment, the moving member 30 is attached to the side frames 15 on both sides, and the moving members 30 attached on 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 frames 15 on both sides independently move (rotate) in accordance with the load. Depending on the size, the occupant's body can be sunk backwards.

(Operational effect of the pressure receiving member 20 and the moving member 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.

And the movement prevention part 39 with which the moving member 30 was equipped is a contact part which contacts the rear edge part 15c of the side frame 15 after movement (rotation) of the movement member 30, and blocks | prevents movement (rotation). .
The movement preventing portion 39 of the moving member 30 is integrally formed by extending the moving member 30 in the outer circumferential direction, and the side surface 15 (more specifically, the rear edge) after the contact surface moves (rotates). Since it abuts against the portion 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 15 to prevent movement (turning), but the movement preventing portion 39 and the side frame 15 In order to eliminate the noise generated during the contact, a silencer such as a rubber having a thickness that does not hinder the stability of the movement (rotation) stop of the moving member 30 can be attached. If it comprises, the stable movement (rotation) prevention can be performed, and the silencing effect can be expected.

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

  At the time of a rear collision, if the occupant tries to move 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.

  Although the example which provided the moving member 30 in the side frame 15 of the right-and-left both sides is shown in the said embodiment, it is good also as a structure provided only in one side frame 15. FIG. In this case, the wires 21 and 22 can be directly engaged with 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 includes a lower frame base portion 17 and a lower frame erection portion 18. The lower frame erection part 18 (member center) is formed so as to connect a pair of lower frame base parts 17 spaced apart in the left-right direction, and is provided in contact with the lower frame base part 17. ing. The lower frame base portion 17 is connected to the lower side of the side plate 15 a of the side frame 15. And the lower frame base part 17 is formed so that the downward direction of the side plate 15a may be extended, and is extended in the range which does not have trouble in relation to the seating frame 2. FIG.
In the seat back frame 1 of the present embodiment, the side frame 15 and the lower frame base portion 17 are formed as separate members, but may be formed as an integral plate frame or the like. Moreover, although the lower frame foundation part 17 and the lower frame installation 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 sandwiches a fragile portion (a hole portion 17k, an inner fragile portion 17e, a side fragile portion 17m described below) that deforms when an impact load is applied, and a part of the fragile portion. And a restricting portion (a restricting portion 40 described below) that is disposed at a position and restricts the deformation amount of the fragile portion. Below, especially the structure by which the weak part and the control part were formed in the lower frame base part 17 which comprises a lower frame is demonstrated. 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 lower frame base 17)
The lower frame base portion 17 constituting the lower frame includes a side plate 17a as a frame side portion extending in the vertical direction (front-rear direction), and a frame extending portion extending from the side plate 17a toward the inner side in the left-right direction. As an intermediate plate 17b. As shown in FIG. 4, the lower frame base portion 17 has a hole portion 17k as a first fragile portion formed as a fragile portion on a connecting portion 17x that connects the side plate 17a and the intermediate plate 17b. And an inwardly fragile portion 17e as a second fragile portion connected to the hole portion 17k and formed on the intermediate plate 17b.

Further, in the lower frame base portion 17, a side weak portion 17m is formed as a third weak portion that is connected to the hole portion 17k and formed on the side plate 17a.
The “frame side part” includes the side plate 15 a of the side frame 15, and the “frame extension part” may include the rear edge part 15 c of the side frame 15 and the lower frame erection part 18. However, as this embodiment, the example in which the weak part (The hole part 17k, the inward weak part 17e, the side weak part 17m) was formed in the lower frame base part 17 is shown.

  The lower frame base portion 17 is formed by bending the side plate 17a joined to the side plate 15a of the side frame 15 and the inner side of the side frame 15 substantially perpendicularly from the rear end portion of the side plate 17a. And an intermediate plate 17b. 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 lower frame base portion 17 to the side frame 15 are formed above the shaft insertion hole 17c. Below the side frame 15, a hole is provided at a position aligned with the mounting hole 17 d when the side plate 17 a is overlapped. The hole formed in the side frame 15 and the lower frame base portion 17 are provided. 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. The plurality of mounting holes 17d formed need not all be fixed to the side frame 15, and a member other than the side frame 15 may be attached.

  At least one of the side plate 17a and the intermediate plate 17b has a fragile portion (that is, an inner fragile portion 17e and a side fragile portion 17m) connected to the hole portion 17k. In addition, in this embodiment, as shown in FIG. 4, FIG. 5, etc., the structure provided with the weak part (inner weak part 17e, side weak part 17m) in both the side board 17a and the intermediate | middle board 17b is shown. .

In the present invention, the fragile portion (that is, the hole portion 17k, the inner fragile portion 17e, and the side fragile portion 17m) is between the reclining mechanism 11 and the side frame 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 15, when an impact load is applied, deformation of each fragile portion is not hindered by the seating frame 2 or the side frame 15, It can absorb impact energy efficiently.

  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, is formed by a concave portion that is recessed forward, and is formed to extend toward the inside of the pair of side frames 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 15 along the left-right direction, that is, the seat width direction.

  When the occupant suddenly moves rearward, 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, so that the lower frame base portion 17 is deformed to be bent. With this deformation, the seat back frame 15 tilts backward. Therefore, it is preferable that the inwardly weakened portion 17e is formed on the lower frame base portion 17 provided below the side frame 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 lower 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 weakened portion 17e formed on the intermediate plate 17b of the lower frame base portion 17 is a horizontal extending along the longitudinal direction (the seat width direction) of the lower frame (more specifically, the lower frame erection portion 18). A portion (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 are provided.

  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. As described above, since the inwardly fragile portion 17e and the hole portion 17k are formed to be connected, when an impact load such as a rear collision is applied to the lower frame base portion 17, as described below, The inner weakened portion 17e of the lower frame base portion 17 is deformed starting from the hole 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 an impact load smaller than the inner fragile portion 17e which is the second fragile portion and the side fragile portion 17m which is the third fragile portion. Further, a configuration in which the plate thickness is formed thinner than the inner weak portion 17e and the side weak portion 17m, or a configuration formed by a deeply recessed portion may be employed.

  The horizontal portion 17f can be bent and deformed so as to be crushed in the vertical direction when a predetermined impact load (a large impact load at the time of normal seating) is applied to the seat back frame 1 such as a rear collision. (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. Therefore, the rigidity of the lower frame base portion 17 against 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 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 bent portion (connecting portion 17x) is rigid with respect to a load in the vertical direction. It has. Therefore, depending on the magnitude of the impact load, the lower 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, the upper portion of the lower frame base portion 17 is deformed so as to tilt backward, so that it is possible to efficiently absorb the energy of the backward tilting load.

  In order to make the hole 17k easier to deform than the fragile portion (inner fragile portion 17e and side fragile portion 17m described later) with respect to an impact load, for example, the width (the size in the height direction) of the hole 17k. ) At least equal to or slightly larger than the width of the horizontal portion 17f or the lateral weak portion 17m in the short direction (vertical direction). 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.

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 a pair of lower frame base part 17 and 17 was 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 lower 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 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 portions other than the inner fragile portion 17e. Can absorb impact energy.
Note that the harness mounting portion 17i is not located above the bent portion 17g for the purpose of improving 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 rear collision. It is preferable to be provided 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.

  On the rear surface of the intermediate plate 17b provided with the inner fragile portion 17e as described above, the restricting portions 40 (the first restricting portion 41 and the second restricting portion 42) that face each other via the inner fragile portion 17e. ) Is 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 (ie, the restricting surface 41 a ) provided above is lower than the upper end portion of the inward weakened portion 17e (more specifically, the horizontal portion 17f). Arranged. 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 (the first restricting portion 41 and the second restricting portion 42) to contact 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. There is a formed side and further behind (inner side weak portion 17e of a lower edge of the opposite side) is extended to the other side). By adopting such a configuration, the first restricting portion 41 firmly contacts the restricting surface 42a formed in a flat shape, so that the first restricting portion 41 is against the second restricting portion 42. Slipping and shifting are suppressed, and the deformation of the inner fragile portion 17e can be suppressed more stably.

To the above structure, for example, in a state (normal state) before the impact energy is applied, (the opposite side to the inner side weak portion 17e) rear side of the regulating surface 42a of the second regulating portion 42 edge end portion and (the inner fragile portion 17e opposite) the first rear-side rearward of the edge portion (the inner side opposite to the fragile portion 17e) of the regulating surface 41a of the restricting portion 41 is formed to be 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.

  A lower frame erection part 18 is joined to the side plate 17 a or the intermediate plate 17 b of the pair of lower frame bases 17. The lower frame erection part 18 is preferably 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.

  The inward fragile portion 17e is preferably located at a position that does not overlap the lower frame erection portion 18 and above the lower frame erection portion 18. As described above, when the inner fragile portion 17e is provided at a position not overlapping the lower frame erection portion 18, the inner fragile portion 17e is deformed when a load in a backward tilting direction is applied to the seat back frame 1. Is preferable because it is not hindered by the lower frame erection part 18.

  Further, the fragile portion is formed on the side plate 17 a 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 weak portion 17m in the side plate 17a. 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 fragile portion 17m has a substantially semicircular cross section like the inner fragile portion 17e, and is recessed so as to be recessed from the inside toward the outer side of the side frame 15 in the left-right direction (sheet width direction). And the side weak part 17m is formed so that it may extend linearly toward the front from back. In other words, the side weakened portion 17 m is a concave portion that extends along the front-rear direction and is formed below the side frame 15. The hole 17k, the inner fragile portion 17e, and the side fragile portion 17m are all formed at 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.

  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, as described above, 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 lower frame side portion 17 bends and deforms in the vertical direction. As a result, the inner fragile portion 17e is further easily deformed. Can be absorbed stably. 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.

  Said inward weak part 17e and side weak part 17m are formed by performing press work etc. with respect to the lower frame base part 17. FIG. Further, the hole 17k may be formed by cutting after forming the inner weak part 17e and the side weak part 17m on the lower frame base part 17, or after forming the hole 17e in advance, You may form the weak part 17e and the side weak part 17m.

(Function and effect of the lower frame foundation 17)
The manner in which the lower frame base portion 17 is deformed when an impact load at the time of rear collision is applied will be described below with reference to FIGS.
FIG. 7 shows a state immediately 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 a load is transmitted to the lower frame base portion 17, the side weakened portion 17m formed in 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 15 provided above the lower frame base portion 17 tilts backward, and the seat back frame 1 is deformed.

  As described above, the lower frame base portion 17 includes not only the inner weak portion 17e and the hole portion 17k but also the side weak portion 17m, so that the lower frame base portion 17 is stepped from the hole portion 17k as a starting point. It can be easily deformed and can efficiently absorb impact energy. 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, the impact energy at the time of the rear collision can be efficiently absorbed by the lower 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 a rear collision is applied, the inwardly fragile portion 17e is bent so as to be crushed in the vertical direction, and the side frame 15 (and the seat back frame 1) tilts backward, but the inwardly fragile When the 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 fragile 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 lower 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 15 and the upper frame 16, so that the impact energy due to the rear collision or the like can be efficiently transmitted to the seat back 1 and absorbed. Is possible.
As a result, the inner fragile portion 17e and the side fragile portion 17m formed on the lower frame base portion 17 can be deformed, and the impact energy can be absorbed more efficiently.

<< Other Embodiments >>
Although the example in which the restricting portion 40 is fixedly joined to the intermediate plate 17b of the lower frame base portion 17 and attached is shown, as another embodiment of the restricting portion, as shown in FIG. It is good also as a structure shape | molded integrally with the board 17b. The restricting portion 140 is formed so as to be recessed backward from the intermediate plate 17b.

The restricting portion 140 formed integrally with the lower frame base portion 17 is similar to the restricting portion 40 described above, the first restricting portion 141 and the second restricting portion 141 having opposing portions facing each other, that is, restricting surfaces 141a and 142a, respectively. It is comprised by the control part 142. FIG. In addition, since the effect of the control part 140 is the same as that of the said control part 40, the description is abbreviate | omitted.
In this way, by forming the restricting portion 140 integrally with the lower frame base portion 17, not only can the number of parts be reduced, but there is no need to perform work such as welding, so the work process can be shortened. it can.

  As still another embodiment, as shown in FIG. 10, the restricting portion 240 is formed by integrally forming a first restricting portion 241 and a second restricting portion 242, and then the intermediate plate 17 b of the lower frame base portion 17. It is good also as a structure attached to. In the restricting portion 240, the first restricting portion 241 and the second restricting portion 242 are formed continuously in the vertical direction, and at a position corresponding to (overlapping) the horizontal portion 17f of the inward fragile portion 17e. An opening 240a such as a recess or a hole having the same shape as the horizontal portion 17f is formed. Therefore, by forming the opening 240a in the restricting portion 240, when the impact load is applied to the seat back frame 1, the restricting portion 240 does not hinder the deformation of the inner weak portion 17e.

  Further, by integrally forming the first restricting portion 241 and the second restricting portion 242 arranged in parallel in the vertical direction, the dimension of the opening 240a, that is, the distance between the restricting surfaces 241a and 242a is set with high accuracy. can do. Further, when attaching the restricting portion 240 to the intermediate plate 17b of the lower frame base portion 17, the number of fastening (joining) portions can be reduced, so that the cost for the manufacturing process can be reduced.

  As still another embodiment, a fastening part 341b is formed by separately forming the first restriction part 341 and the second restriction part 342 as in the restriction part 340 shown in FIG. , 342b may be formed. The fastening portions 341b and 342b are extended from the portion where the regulation surfaces 341a and 342a are not formed toward the inside and the upper side of the seat, respectively, and are flat so as to follow the intermediate plate 17b of the lower frame base portion 17. Is formed.

  And the hole is formed in the fastening parts 341b and 342b so that a fastening means can be penetrated. By making this hole a long hole, positioning can be facilitated when attaching the first restricting portion 341 and the second restricting portion 342.

  As described above, the first restricting portion 341 and the second restricting portion 342 are provided with the fastening portions 341b and 342b, respectively, so that when fastening to the intermediate plate 17b of the lower frame base portion 17, a bolt-nut or the like is fastened. The restricting portion 340 can be attached using the means.

  Thus, instead of attaching the restricting portion 340 by means of welding or the like, the fastening portion 341b, 342b is provided and attached to the lower frame base portion 17 by the fastening means. The restricting portion 340 can be optionally removed according to the design. Further, by forming the fastening portions 341b and 342b respectively as the first restricting portion 341 and the second restricting portion 342, the rigidity of the first restricting portion 341 and the second restricting portion 342 can be improved. .

  As still another embodiment, like the restriction portion 440 shown in FIG. 12, the width of the restriction surface 441a provided in the first restriction portion 441 and the second restriction portion 442 is different from the width of the restriction surface 442a. It may be formed. In each of the above embodiments, the configuration in which the widths in the left and right directions of the first restricting portion and the second restricting portion provided on the upper and lower sides are equal to each other is illustrated. In particular, the width in the left-right direction of the restriction surface of the restriction portion disposed below may be formed large.

  The width in the left-right direction (length indicated by a in FIG. 12) of the restriction surface 441a of the first restriction portion 441 is the width in the left-right direction (length indicated by b in FIG. 13) of the restriction surface 442a of the second restriction portion 442. And so on). At this time, the width of the restricting surface 442a of the second restricting portion 442 disposed below is formed larger. That is, a <b.

  As described above, when one of the first restricting portion 441 and the second restricting portion 442 constituting the restricting portion 440 is formed wider than the other, when an impact load is applied, for example, the seat back frame 1 Even if the torsional deformation occurs, the first restricting portion 441 and the second restricting portion 442 are likely to come into contact with each other. That is, by forming one wide, even if the seat back frame 1 is tilted backward so as to be twisted due to a complicated input load, the first restricting portion 441 and the second restricting portion 441 are arranged. Since the portion 442 comes into contact, the deformation amount of the seat back frame 1 can be controlled.

  Further, when attaching the restricting portion 440 to the intermediate plate 17b of the lower frame 17 by welding work or the like, it is not necessary to strictly define the attachment position by making one of them wide. For example, even when the attachment position of the second restricting portion 442 is slightly shifted in the left-right direction with respect to the first restricting portion 441, the second restricting portion 442 is formed wide so that the seat When succeeding the back frame 1, the first restricting portion 441 can be brought into contact with the second restricting portion 442. As a result, it is not necessary to perform exact positioning at the time of attaching the restricting portion 440, so that workability is improved.

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

  In each of the above embodiments, as a specific example, the case of a rear collision has been described. However, the configuration of the present invention is not limited to the case of a rear collision, for example, as a configuration for absorbing impact energy at the time of a side collision. Is also applicable. Moreover, although the 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 Side frame 15a Side plate (frame side)
15b front edge 15c rear edge (frame extension)
15d Protruding part 15e Convex part 16 Upper frame 16a Side face part 17 Lower frame base part 17a Side plate (frame side part)
17b Intermediate plate (frame extension)
17c Shaft insertion hole 17d, 17j Mounting hole 17e Inner fragile portion (second 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 erection part (frame extension part)
19 Headrest pillar 19a Pillar support part 20 Pressure receiving member 21 Wire (connection member, upper connection member)
21a shaft support part 22 wire (connection member, downward connection member)
30 Moving member (impact reducing member)
32 Shaft 35 Tension coil spring (biasing means)
39 Movement prevention part 40,140,240,340,440 Restriction part 240a Opening part 41,141,241,341,441 1st restriction part 41a, 141a, 241a, 341a, 441a Restriction surface (opposing part)
341b Fastening portion 42, 142, 242, 342, 442 Second restricting portion 42a, 142a, 242a, 342a, 442a Restricting surface (opposing portion)
342b Fastening part

Claims (7)

A lower frame disposed below the seat back frame;
A fragile part that deforms when an impact load is applied;
A restricting portion that is disposed at a position sandwiching a part of the fragile portion and restricts the deformation amount of the fragile portion, and
The lower frame includes a frame side portion that is positioned on the left and right sides and extends in the up-down direction, and a frame extension portion that extends from the frame side portion toward the inside in the left-right direction,
The weakened portion is formed in a connecting portion that connects the frame side portion and the frame extending portion, and is formed in the frame extending portion while being connected to the first weakened portion. A second vulnerable portion to be
The vehicle seat according to claim 1, wherein the first fragile portion is formed to be deformed by an impact load smaller than that of the second fragile portion. A lower frame disposed below the seat back frame;
A fragile part that deforms when an impact load is applied;
A restricting portion that is disposed at a position sandwiching a part of the fragile portion and restricts the deformation amount of the fragile portion;
With
The lower frame includes a frame side portion that is positioned on the left and right sides and extends in the up-down direction, and a frame extension portion that extends from the frame side portion toward the inside in the left-right direction,
The fragile portion is formed on a first fragile portion formed on a connecting portion that connects the frame side portion and the frame extending portion, and is formed on the frame side portion while being connected to the first fragile portion. And a third vulnerable part
The vehicle seat according to claim 1, wherein the first fragile portion is formed to be deformed by an impact load smaller than that of the third fragile portion. The fragile portion has a second fragile portion connected to the first fragile portion and formed in the frame extension portion,
At least one of the first fragile portion, the second fragile portion, and the third fragile portion is disposed at a position sandwiched between the restricting portions,
The vehicle seat according to claim 2, wherein the first fragile portion, the second fragile portion, and the third fragile portion are all formed at the same height. The restricting portion comprises a first restricting portion and a second restricting portion each having a restricting surface disposed to face a position sandwiching the fragile portion,
The said control surface with which at least one was equipped among the said 1st control part and the said 2nd control part is formed in planar shape, The Claim 1 thru | or 3 characterized by the above-mentioned. Vehicle seats. A fragile part that deforms when an impact load is applied;
A restricting portion that is disposed at a position sandwiching a part of the fragile portion and restricts the deformation amount of the fragile portion, and
The restricting portion includes two opposing portions formed at positions sandwiching the fragile portion,
The distance between the two opposing portions is formed smaller than the width in the direction sandwiched by the restricting portion of the fragile portion,
The vehicular seat, wherein the fragile portion comprises a groove, and a part of the restricting portion is disposed at a position overlapping the groove.   6. The vehicle seat according to claim 5, wherein a part of a portion of the restricting portion disposed on the upper side of the fragile portion overlaps with the groove. The restricting portion has a first restricting surface and a second restricting surface that are disposed to face the position sandwiching the fragile portion,
Regulating surface and the second regulating surface of said first, a vehicle according to any one of claims 1 to 6, characterized in that it is wider than the restriction portion upper and lower end surfaces of the Sheet.

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