JP2016020209A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle seat that is easily deformed when an impact energy is applied at collision, especially at rear collision, and can efficiently absorb the impact energy.SOLUTION: A vehicle seat includes a frame F that deforms when an impact load is applied, and has a frame side part located at right and left sides, and a frame extension part C that extends to a right and left inside rather than the frame side part. The vehicle seat has fragile parts 15f, 15g, and 15h that deform when the impact load is applied at positions in the frame F where the frame side and a connection part of the frame extension part C do not overlap.SELECTED DRAWING: Figure 3

Description

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

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

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

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

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

  Therefore, the present applicant relates to a technique for absorbing impact energy by deforming a seat back frame, and a flexible weak portion (a constricted portion deformed by an impact load) as a lower frame (below the side frame, the side frame). (Patent Application 2010), a technology for preferentially bending the fragile portion when impact energy is applied, such as during a rear collision, and efficiently absorbing the impact energy. -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, the fragile portion is provided in the vicinity of the connecting portion between the side frame and the lower frame, that is, the portion where the lower frame is installed between the side frames. However, since the connecting part of the side frame and the lower frame is highly rigid, it may be difficult to absorb the impact by deforming the connecting part with deformation of the weak part at the time of rear collision etc. In order to deform it, the structure around the fragile part may be complicated. Therefore, there is a possibility that the fragile portion is difficult to be deformed at the time of a rear collision, and a technique capable of absorbing impact energy more efficiently has been demanded.

Further, in the above technique, when a weak portion is formed at the connecting portion between the side frame and the lower frame, the rear seat tilts depending on the magnitude of impact energy applied when the seat back frame is deformed to tilt backward. There is a disadvantage that the angle of the seat is too large, and the seating posture of the occupant may change and the seating feeling may be impaired.
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.

SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle seat that is easy to deform and can efficiently absorb impact energy when impact energy is applied at the time of collision, particularly at the time of rear collision, without complicating the configuration of the fragile portion. There is to do.
Another object of the present invention is to reduce the amount of seat deformation (inclined backward) in a vehicle seat that absorbs impact energy when the seat is bent and deformed when impact energy is applied in the event of a collision, particularly a rear-end collision. An object of the present invention is to provide a vehicle seat in which the influence on the seating posture of an occupant is reduced by regulating the angle.

  According to the vehicle seat of the present invention, the subject includes a frame that is deformed when an impact load is applied, and a frame side portion positioned on the left and right sides, and extends inward in the left and right direction from the frame side portion. A fragile portion that deforms when an impact load is applied at a position that does not overlap a connecting portion that connects the frame side portion and the frame extending portion. That is solved.

Generally, the frame extension portion extending inward in the left-right direction with respect to the frame side portion and the connection portion between the frame side portion are particularly higher in rigidity than other portions. Therefore, when a weak part is formed in the position which overlaps with this part, even if an impact load is added, a weak part may become difficult to deform | transform.
On the other hand, when the impact load is applied to the vehicular seat, the fragile portion is deformed by providing a fragile portion that is deformed by the impact load at a position that does not overlap the connecting portion between the frame extension portion and the frame side portion. It becomes easy to do. As a result, since a part of the vehicle seat is easily deformed starting from the fragile portion, the impact energy can be absorbed efficiently.
Conventionally, when a weak portion is formed in a portion having high rigidity, it may be necessary to provide a complicated configuration in order to easily deform the weak portion. However, as described above, by forming the fragile portion at a position where the rigidity is not relatively high, it is possible to efficiently absorb the impact energy without making the fragile portion complicated.

At this time, as in claim 2, it has a frame erection part that is erected between the frame side parts, and the weakened part is a part of the frame side part that is separated from a part that overlaps the frame erection part. It is preferred that it be provided.
Thus, in a vehicle seat including a frame side part and a frame erection part that is arranged so as to partially overlap the frame side part and connects the frame side part, the frame side part and the frame erection part In general, the portion where the overlaps has higher rigidity than the other portions. On the other hand, the portion on the frame side portion of such a vehicle seat that is out of the portion overlapping the frame erection portion has lower rigidity than the portion where the frame side portion and the frame erection portion overlap.
Accordingly, by forming a fragile portion (a portion that deforms when an impact load is applied) in a portion of the frame side portion that is out of the portion overlapping the frame erection portion, an impact at the time of a rear collision or the like is applied to the vehicle seat. When a load is applied, the fragile portion is easily deformed. As a result, since a part of the vehicle seat is easily deformed starting from the fragile portion, the impact energy can be absorbed efficiently.

At this time, as in claim 3, it is preferable that the fragile portion is formed at a rear end portion of the frame side portion.
Thus, by forming the fragile portion at the rear end portion of the frame side portion, the rear end portion of the frame side portion can be particularly easily deformed. Since the frame side portion is easily deformed so as to tilt backward starting from the rear end portion of the frame side portion, the frame side portion is easily deformed so as to tilt backward. Energy can be absorbed efficiently.

Further, as in claim 4, the frame side portion has an inner extending portion that extends inward in the left-right direction from the rear end portion of the frame side portion, and at least a part of the fragile portion is the inner extending portion. It is preferable that it is formed in the form.
As described above, the frame has appropriate rigidity by further including the inner extending portion that extends inward in the seat width direction (left-right direction) from the rear end portion of the frame side portion. By forming the fragile portion also in the inner extension portion, the frame side portion is easily deformed so as to tilt backward, particularly at the time of a rear surface collision. Therefore, with the above configuration, it is possible to efficiently absorb the impact energy particularly at the time of a rear collision.

At this time, as in claim 5, it is preferable that the fragile portion is provided in a range outside a height range in which the frame erection portion is disposed.
As described above, the frame side portion is provided with the fragile portion outside the height range where the frame erection portion is disposed, so that the frame has a highly rigid portion (that is, the frame erection portion with respect to the frame side portion). The portion other than the portion where the portion is disposed is easily deformed. Thus, since it becomes the structure by which a part with high rigidity is arrange | positioned in places other than a weak part, the part where a part including a part with high rigidity becomes integral, and becomes easy to deform | transform. As a result, impact energy can be absorbed efficiently and stably.

At this time, as in claim 6, it is preferable that the fragile portion is provided below a height range in which the frame erection portion is disposed.
By providing a fragile part below the part where the frame erection part is connected to the frame side part (that is, the lower end part of the frame erection part), the frame has a highly rigid part (that is, with respect to the frame side part). Therefore, the lower part is more easily deformed than the part where the frame erection part is connected. Thus, since it becomes the structure by which a part with high rigidity is arrange | positioned above a weak part, the flame | frame upper part containing a part with high rigidity becomes united, and a flame | frame becomes easy to deform | transform. That is, when an impact load is applied, the frame side portion is prevented from being deformed at a position higher than the frame erection portion.
Therefore, since it is suppressed that a frame deform | transforms in parts other than a weak part, it becomes easy to deform a frame from a weak part as a starting point, and the deformation | transformation (bending) position and bending deformation (bending) location of a frame may be limited. it can. As a result, impact energy can be absorbed efficiently and stably.

Furthermore, as in claim 7, it has a reclining mechanism attached to the side portion of the frame, and it is preferable that the fragile portion is provided below the reclining mechanism.
In general, on the side of the frame, the part to which the reclining mechanism is attached is also a part having high rigidity. Therefore, by providing the fragile part below the reclining mechanism, the upper part of the frame side part including the reclining mechanism is integrated and the frame is easily deformed. In particular, when an impact load at the time of rear collision is applied, the seat back frame tends to tilt backward from the reclining mechanism due to its configuration, but by adopting the above configuration, the vulnerable part has priority over the reclining mechanism. Can be deformed. Therefore, impact energy can be absorbed efficiently and stably.

At this time, as in claim 8, the pressure receiving member connected to the frame side portion via a connecting member and supporting an occupant, and provided on the frame side portion and connected to the connecting member, the pressure receiving member And an impact reducing member that moves the pressure-receiving member rearward by an impact load applied thereto, and the fragile portion is preferably formed below the impact reducing member.
The rearward movement of the occupant can be promoted by supporting the body of the occupant moving backward with a pressure receiving member and allowing the pressure receiving member to move rearward at the time of a rear collision or the like. As described above, when the occupant is prompted to move rearward, the impact energy is transmitted to the side portion of the frame via the connecting member, so that the impact energy can be transmitted particularly efficiently.
Then, the impact reducing member is stably attached to the side of the frame by forming the fragile portion below the impact reducing member, that is, on the side of the frame and at least not overlapping the impact reducing member. The Therefore, the mounting rigidity of the impact reducing member is not reduced. Further, by attaching the impact reducing member to a stable position on the side of the frame, it is possible to stabilize the behavior of the impact reducing member during operation.
Furthermore, by providing the weak part in a position that does not overlap with the impact reducing member, the impact reducing member and the weak part do not interfere with each other and operate, but each behavior can be performed independently. The impact energy can be absorbed efficiently.

According to a ninth aspect of the present invention, it is preferable that the vehicle further includes a side airbag unit provided on the side portion of the frame, and the fragile portion is formed below the side airbag unit.
As described above, by providing the side airbag unit, it is possible to absorb not only the rear collision but also the impact energy of the side collision. And, by forming the weak portion below the side airbag unit, that is, on the side of the frame and at least not overlapping the side airbag unit, the side airbag unit is stable with respect to the frame side. To be attached. Therefore, the attachment rigidity of the side airbag unit is not reduced. Further, by attaching the side airbag unit to a stable position on the side of the frame, the behavior of the side airbag unit can be stabilized during operation.
Furthermore, since the side airbag unit and the fragile portion do not operate by interfering with each other by providing the fragile portion having the above-described configuration, each behavior can be performed independently. Can be absorbed.

Further, at this time, as in claim 10, a restricting portion that is disposed at a position sandwiching a part of the fragile portion and regulates the deformation amount of the fragile portion by contacting each other when the fragile portion is deformed. Is further provided.
As described above, when the fragile portion is deformed to a certain position (shape) by facing the position where the fragile portion is sandwiched so as to regulate the deformation amount of the fragile portion, the opposing portion is opposed. The restricting portion comes into contact, and the fragile portion is thereby prevented from being further deformed. Therefore, the deformation amount of the fragile portion does not become larger than a certain value, and as a result, the deformation amount 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.

According to the invention of claim 1, since the frame includes the fragile portion (the portion that deforms when an impact load is applied) at a position avoiding a particularly rigid portion, the fragile portion is provided when the impact load is applied. As a starting point, the frame is easily deformed. Therefore, a vehicle seat that can efficiently absorb impact energy can be provided.
According to the second aspect of the present invention, since the fragile portion is provided at a position avoiding a portion having high rigidity in the frame, the frame is easily deformed starting from the fragile portion when an impact load is applied. Therefore, a vehicle seat that can efficiently absorb impact energy can be provided.
According to the invention of claim 3, since the fragile portion is formed at the rear end portion of the side portion of the frame, the frame is easily deformed particularly with respect to the impact load at the time of the rear collision, and the impact energy at the time of the rear collision is improved. The vehicle seat can be well absorbed.
According to the invention of claim 4, since the inner extension portion is further formed at the rear end portion of the frame side portion, and the weak portion is formed in the inner extension portion, the frame has appropriate rigidity. On the other hand, when the impact load at the time of a rear collision is applied, the fragile portion is particularly easily deformed, so that the vehicle seat can stably absorb the impact energy.
According to the invention of claim 5, since the fragile portion is provided in a range excluding the height range where the frame erection portion is disposed, the deformation portion of the frame can be limited, and the impact energy can be stably supplied. It can be set as the vehicle seat which can absorb.
According to the invention of claim 6, since the fragile portion is provided below the frame erection portion, the deformation portion of the frame can be limited, and the vehicle can stably absorb impact energy. It can be a sheet.
According to the invention of claim 7, since the fragile portion is provided below the reclining mechanism, the deformed portion of the frame can be limited and the impact energy can be stably absorbed. It can be.
According to the invention of claim 8, since the impact reducing member is provided, the impact energy can be efficiently transmitted to the frame side portion. Furthermore, since the fragile part is provided below the impact reducing member, when the impact load is applied, the impact reducing member and the fragile part operate stably, so that the impact energy is absorbed efficiently and stably. Can be made.
According to the ninth aspect of the invention, since the side airbag unit is provided, the impact energy of the side collision can also be absorbed. In addition, since the fragile part is provided below the side airbag unit, when the impact load is applied, the side airbag unit and the fragile part operate stably, so the impact energy can be efficiently and stably applied. Can be absorbed.
According to the invention of claim 10, the vehicular seat includes the fragile portion that deforms when an impact load is applied and the restricting portion that regulates the deformation amount of the fragile portion, so that the deformation amount of the seat is a predetermined value. It can regulate so that it may not become larger. Further, by controlling the deformation amount of the seat, it is possible to reduce the influence on the seating posture of the occupant.

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 explanatory drawing which shows the state before the rear surface collision of the seat frame which concerns on one Embodiment of this invention. It is explanatory drawing which shows the state after the rear surface collision of the seat frame which concerns on one Embodiment of this invention. It is explanatory drawing which shows the state before the rear surface collision around the side frame which concerns on one Embodiment of this invention. It is explanatory drawing which shows the state after the rear surface collision of the side frame periphery which concerns on one Embodiment of this invention. It is a partial assembly figure of the seat back frame concerning other embodiments of the present invention. It is explanatory drawing of the periphery of the seating frame which concerns on other embodiment of this invention.

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

  1 to 7 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 an explanatory diagram showing a state after a rear collision of the seat frame, FIG. 6 is an explanatory diagram showing a state before the rear collision around the side frame, and FIG. 7 is a side frame. It is explanatory drawing which shows the state after the rear surface collision of a periphery. FIG. 8 is a partial assembly view of a seat back frame according to another embodiment of the present invention, and FIG. 9 is an explanatory view of the periphery of a seating frame according to still another embodiment.

<< Basic configuration of vehicle seat S >>
With reference to FIG. 1 thru | or FIG. 7, the vehicle seat S which concerns on this embodiment is demonstrated.
As shown in FIG. 1, the vehicle seat S includes a seat back S <b> 1 (back portion), a seating portion S <b> 2, and a headrest S <b> 3, and the seat back S <b> 1 (back portion) and the seating portion S <b> 2 are the “frame” of the present invention. Cushion pads 1a and 2a are placed on the seat frame F 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 denotes a headrest pillar that supports the headrest S3.

As shown in FIG. 2, the seat frame F of the vehicle seat S includes a seat back frame 1 that constitutes a seat back S1, and a seat frame 2 that constitutes a seat portion S2.
The seating frame 2 has the structure in which the cushion pad 2a is placed as described above and is covered with the skin material 2b from above the cushion pad 2a, and the occupant is supported from below. The seating frame 2 is supported by a leg (not shown), and an inner rail (not shown) is attached to the leg, and the slide type is adjustable in the front-rear direction with the outer rail installed on the vehicle floor. Is assembled.
Further, the rear end portion of the seating frame 2 is connected to the seat back frame 1 via a reclining mechanism 11.

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

  The seat back S1 has the cushion pad 1a mounted on the seat back frame 1 as described above and is covered with the skin material 1b from above the cushion pad 1a, and supports the back of the occupant from the rear. . In the present embodiment, the seat back frame 1 is a substantially rectangular frame as shown in FIG. 2, and includes a side frame main body portion 15, an upper frame 16, a frame base portion 17, and a lower frame. Part 18.

  Note that the side plate 15a of the side frame main body 15 described below, the side portion 16a of the upper frame 16, the side plate 17a of the frame base portion 17, and the seating side frame 60 of the seating frame 2 are included in the present invention. Corresponds to the “frame side portion”.

In FIG. 3, a portion (hatched portion) disposed on the inner side in the left-right direction with respect to the boundary portion X indicated by a dotted line corresponds to a “frame extending portion”. The “frame extension part” is configured by a rear edge part inner side 15 c ₂ , an intermediate plate inner side 17 b ₂ , and a part of the lower frame erection part 18.

The boundary portion X represents a line extending downward in the left-right direction inner end portion formed along the vertical direction in the rear edge portion 15c of the side frame main body portion 15. The trailing edge 15c is in the lower, is split trailing edge outer 15c _1, in a trailing edge portion inner 15c ₂ by the boundary portion X. The intermediate plate 17b of the frame base portion includes an intermediate plate outer 17b ₁ by the boundary portion X, is divided into a middle plate inner 17b _2.

  Further, the intermediate plate 17b of the frame base portion 17, the lower frame erection portion 18, and the upper portion 16b of the upper frame 16 described below correspond to the “frame erection portion” of the present invention.

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

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

  A headrest S3 is disposed on the upper portion 16b of the upper frame 16. As described above, the headrest S3 is configured such that the pad material 3a is provided on the outer peripheral portion of the core material (not shown) and the outer periphery of the pad material 3a is covered with the skin material 3b. A pillar support portion 19 a is disposed on the upper frame 16. A headrest pillar 19 (see FIG. 1) that supports the headrest S3 is attached to the pillar support portion 19a via a guide lock (not shown), and the headrest S3 is attached. In the present embodiment, an example in which the seat back S1 and the headrest S3 are separately formed has been described. However, a bucket type in which the seat back S1 and the headrest S3 are integrally formed may be used.

  As shown in FIG. 2, the side frame main body 15 constituting a part of the seat back frame 1 is an extending member constituting the side surface of the seat back frame 1, and includes a flat side plate 15a and a front end of the side plate 15a. Part (end located on the vehicle front side) bent inward in a U-shape, folded back front edge 15b, and rear edge 15c bent inward in an L-shape from the rear end Yes. Note that the rear end portion and the rear edge portion 15c of the side plate 15a are not only configured to be formed by bending a plate material, but also may be configured to join two plate pieces at the connecting portion 15x.

  The side plate 15a of the side frame main body portion 15 of the present embodiment is formed with a hole 15f as a weak portion and a side weak portion 15g, and further, an inner weak portion 15h is formed at the rear edge portion 15c. ing. In addition, the structure and effect | action of these weak parts (hole 15f, side weak part 15g, inward weak part 15h) are mentioned later.

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

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

<< Configuration of frame base portion 17 and lower frame erection portion 18 >>
The lower frame of the seat back frame 1 includes a frame base portion 17 and a lower frame erection portion 18.
The frame base portion 17 includes a side plate 17a extending in the vertical direction (front-rear direction) and an intermediate plate 17b extending from the side plate 17a toward the inner side in the left-right direction. And as shown in FIG. 6, the side plate 17a and the intermediate | middle board 17b are mutually connected in the connection part 17x.
The side plate 17 a of the frame base portion 17 is formed so as to extend below the side plate 15 a of the side frame main body portion 15, and is extended within a range that does not hinder the relationship with the seating frame 2. The frame base portion 17 is connected so that a part thereof overlaps below the side plate 15 a of the side frame main body portion 15.
Further, the intermediate plate 17b of the frame base portion 17 is connected so as to partially overlap below the rear edge portion 15c of the side frame main body portion 15. That is, the side plate 17a corresponds to the “frame side portion”, and the intermediate plate 17b corresponds to the “frame erection portion”.

  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 (more specifically, the seating side frame 60 constituting the seating frame 2) is a reclining mechanism. 11 is arranged.

Further, as shown in FIG. 6, in the side plate 17a, a plurality of attachment holes 17d for attaching the frame base portion 17 to the side frame main body portion 15 are formed above the shaft insertion hole 17c. A hole is provided below the side frame body 15 at a position aligned with the mounting hole 17d when the side plate 17a is overlapped. The hole formed in the side frame body 15 and the frame foundation Fastening means such as bolts are penetrated so as to penetrate the mounting holes 17d of the part 17, and the side frame main body part 15 and the frame base part 17 are joined. Note that the plurality of attachment holes 17d formed need not all be fixed to the side frame main body 15, and a member other than the side frame main body 15 may be attached.
Furthermore, the side frame main body 15 and the frame base portion 17 may be configured to be fixedly joined not only by fastening means such as bolts as described above but also by means such as welding.

  The intermediate plate 17b is formed with a harness mounting portion 17i as a bulged component mounting portion. The harness attachment portion 17i is formed so as to bulge rearward, and a hole into which a clip or the like can be inserted is formed in a part thereof. Thus, by forming the harness attachment portion 17i on the intermediate plate 17b, an uneven shape is formed on the intermediate plate 17b, and the rigidity of the frame base portion 17 with respect to the load is improved.

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

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

  The lower frame erection part 18 (member center) joined to the frame foundation part 17 having the above-described configuration is also equivalent to the “frame erection part”, and is a pair of frame foundation parts that are spaced apart in the left-right direction. 17 is formed so as to be connected to the frame base portion 17. At this time, it is preferable to join 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.

  Although an example in which the frame base portion 17 and the lower frame erection portion 18 are formed as separate members is shown, a configuration in which they are integrally formed may be employed.

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

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

  The pressure receiving member 20 of this embodiment is supported by the connecting member. That is, two wires 21 and 22 as connecting members are installed between the side frame main body portions 15 on both sides, and the pressure receiving member is formed by claw portions formed at predetermined positions on the upper side and the lower side on the back side of the pressure receiving member 20. The pressure receiving member 20 is supported on the back surface of the cushion pad 1a. The wires 21 and 22 are formed from a steel wire having spring properties, and an uneven portion which is a connecting portion is formed.

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

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

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

  As shown in FIG. 2, of the two wires 21 and 22 locked to the pressure receiving member 20 of this embodiment, both ends of the wire 21 locked to the upper side are the side frame main body portions 15 on both sides. Is attached to a shaft support portion 21a provided on the shaft. On the other hand, both end portions of the wire 22 locked to the lower side are hooked to a moving member 30 mounted on the left and right side frame main body portions 15.

  The wire 22 made of a wire thicker than the wire 21 is not easily deformed as described above, and the lower portion of the pressure receiving member 20 is difficult to move backward during normal seating. Therefore, the moving member 30 is attached to the end portion of the wire 22 in order to ensure a sufficient sinking amount at the time of a rear collision.

<< Configuration of Moving Member 30 >>
The moving member 30 as an impact reducing member moves to the rear of the vehicle by the impact load transmitted through the connecting member (wire 22) when a predetermined impact load or more is applied to the pressure receiving member 20 due to a rear collision or the like, and the pressure receiving member. 20 is moved backward, and the occupant is moved backward. “Movement” refers to movement such as horizontal movement and rotation. In the present embodiment, the moving member 30 that rotates about the shaft portion 32 as a rotating shaft will be described. Due to the movement of the moving member 30 to the rear of the vehicle, the pressure receiving member 20 can be moved greatly to the rear of the vehicle. As a result, the occupant is moved rearward, so that the load applied to the occupant can be efficiently reduced.

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

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

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

The movement preventing portion 39 provided in the moving member 30 is in contact with the rear edge portion 15c of the side frame main body portion 15 after the moving member 30 is moved (turned) to prevent the movement (turning). It is.
The movement preventing portion 39 of the moving member 30 is integrally formed by extending the moving member 30 in the outer peripheral direction, and the side frame main body portion 15 (more specifically, after the contact surface moves (turns)). Since it abuts against the rear edge 15c), the movement (rotation) of the moving member 30 can be stably stopped even when an impact load of a predetermined level or more is applied to the pressure receiving member 20 due to a rear collision or the like. .
The movement preventing portion 39 is formed at a position where it does not interfere with the urging means (the tension coil spring 35) and the connecting member (the wire 22).

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

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

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

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

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

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

Since the moving member 30 has the above-described movement (turning) characteristics with respect to the tension generated via the wire 22, when the rear collision occurs, the occupant can be seated back reliably and efficiently. It can be made to sink in the cushion pad of S1.
At this time, the occupant's back is moving backward by sinking into the seat back S1, but the position of the headrest S3 does not change relative to the seat back S1, so the gap between the headrest S3 and the head of the occupant Since the head is shrunk and the headrest S3 can support the head, the impact applied to the neck can be effectively reduced.
Furthermore, as described above, the impact energy can be efficiently transmitted to the side frame main body 15 by the wire 22 locked to the moving member 30.

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

<< Configuration of weak part (hole 15f, side weak part 15g, inner weak part 15h) >>
The vehicle seat S of the present invention sandwiches a fragile portion (a hole portion 15f, a side fragile portion 15g, an inner fragile portion 15h described below) that deforms when an impact load is applied, and a part of the fragile portion. And a restricting portion 40 (a first restricting portion 41 and a second restricting portion 42 described below) disposed at a position and restricting the deformation amount of the fragile portion. Below, especially the structure in which the weak part and the control part were formed in the side frame main-body part 15 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.

  As shown in FIGS. 4 and 6, the side frame main body 15 (more specifically, the side plate 15a) is used as a fragile portion as a rear end portion of the side plate 15a as a frame side portion (more specifically, the side plate 15a and the side plate 15a). A hole 15f as a first weakened part formed on the connecting part 15x connecting the rear edge part 15c) and a second weakened part connected to the hole 15f and formed on the side plate 15a. It has the side weak part 15g.

  The hole portion 15f is a hole formed on the connecting portion 15x of the side frame main body portion 15, and is particularly provided to efficiently absorb impact energy at the time of a rear collision. In this way, by forming the hole 15f at the rear end of the side plate 15a, the side frame body 15 is bent rearward and the seat back frame 1 is tilted backward, particularly when an impact load is applied at the time of rear collision. It is possible to absorb the impact energy effectively.

The side fragile portion 15g has a substantially semicircular cross section and is formed by a concave portion that is recessed outward in the left-right direction, and extends in the front-rear direction of the pair of side frame main body portions 15 (more specifically, the side plates 15a). It is formed to extend. In other words, the side weakened portion 15g is a concave portion that extends along the front-rear direction and is recessed toward the outer side in the left-right direction of the side frame main body portion 15.
The side fragile portion 15g starts from the hole portion 15f and extends to the vicinity of the center in the front-rear direction of the side plate 15a (more specifically, the rear side of the center).
And the side weak part 15g is equipped with the flexibility with respect to the impact load more than predetermined.

  Further, the side frame main body portion 15 includes a rear edge portion 15c as an inner extending portion that extends inward in the left-right direction from the rear end portion of the side plate 15a, and at least a part of the fragile portion is a rear portion. It is formed at the edge 15c. That is, an inner fragile portion 15h as a third fragile portion is formed in the rear edge portion 15c.

The inwardly fragile portion 15h has a substantially semicircular cross section and is formed by a concave portion that is recessed forward, and along the left-right direction of the pair of side frame main body portions 15 (more specifically, the rear edge portion 15c). It is formed to extend. In other words, the side weakened portion 15g is a concave portion that extends along the left-right direction and is recessed toward the front (inside) of the side frame main body portion 15.
The inwardly fragile portion 15h extends from the hole portion 15f to the end portion on the inner side in the left-right direction of the rear edge portion 15c.
And the inward weak part 15h is provided with the flexibility with respect to the impact load more than predetermined.

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

  In order to make the hole 15f more easily deformable than other weak parts (side weak parts 15g, inner weak parts 15h) with respect to an impact load, for example, the width of the hole 15f (the size in the height direction). ) Is formed at least equal to or slightly larger than the width in the short side direction (vertical direction) of the side weak portion 15g and the inner weak portion 15h. By making the size of the hole 15f in the height direction equal to or larger than the width in the vertical direction of the side fragile portion 15g and the inner fragile portion 15h, an impact load such as at the time of rear collision is applied. In this case, since the hole 15f is easily deformed before the side weak part 15g and the inner weak part 15h, the inner weak part 15h can be deformed starting from the hole 15f.

  Each of the side weak part 15g and the inner weak part 15h extends substantially horizontally, and a part of the end in the longitudinal direction is cut away. The notched portion is a hole portion 15f, and the hole portion 15f and the side weak portion 15g and the hole portion 15f and the inner weak portion 15h are formed so as to be connected to each other. Thus, since the side weak part 15g or the inner weak part 15h and the hole 15f are formed so as to be connected, when an impact load such as a rear collision is applied to the side frame main body part 15, As will be described below, the side weak portion 15g and the inner weak portion 15h are deformed starting from the hole 15f. At this time, the side fragile portion 15g and the inner fragile portion 15h are deformed so as to be crushed in the vertical direction (see FIGS. 5 and 7), thereby absorbing the impact energy.

  In addition, although the hole part 15f was formed as a 1st weak part of this embodiment, and the side weak part 15g which consists of a recessed part was shown as a 2nd weak part, a 1st weak part and other weak parts are shown. The first fragile portion does not necessarily have to be formed by a hole as long as it can be deformed by a small impact load. The first fragile portion may be formed so as to be deformed by a smaller impact load than the side fragile portion 15g which is the second fragile portion and the inner fragile portion 15h which is the third fragile portion. Further, a configuration in which the plate thickness is formed thinner than the side fragile portion 15g and the inner fragile portion 15h or a configuration formed by a deeply recessed portion may be employed.

  Said side weak part 15g and inward weak part 15h are formed by performing press work etc. with respect to the frame base part 17. FIG. Further, the hole 15f may be formed by cutting after forming the side weak part 15g and the inner weak part 15h on the frame base part 17, or after forming the hole 15f in advance, the side weak part may be formed. The portion 15g and the inner weak portion 15h may be formed.

  In the present embodiment, the side fragile portion 15g and the inner fragile portion 15h are linearly formed. However, the side fragile portion 15g and the inner fragile portion 15h may be bent on the side plate 15a and the rear edge portion 15c, respectively. .

Said side weak part 15g and inward weak part 15h are each extended substantially horizontally from the hole 15f.
As shown in FIG. 3, at least the hole portion 15f and the side weak portion 15g include a side plate 15a and a side plate 17a corresponding to a “frame side portion” located on the left and right sides, a side plate 15a and a side plate. In the configuration having the frame extending portion C disposed on the inner side in the left-right direction with respect to 17a, the side plate of the side frame main body portion 15 and the frame base portion 17 as a "frame" when viewed from the rear. 17a, the side plate 15a and the frame extending portion C are formed at positions that do not overlap with the connecting portion. More specifically, the hole portion 15f and the side weak portion 15g are formed at positions that do not overlap the side plate 17a and the boundary portion X between the side plate 15a and the frame extension portion C in the frame base portion 17. Yes.

As shown in FIG. 3, the boundary portion X has a lower portion of the side frame main body portion 15 and a frame foundation when the end portion of the rear edge portion 15 c of the side frame main body portion 15 is extended in the vertical direction. A line segment overlapping the portion 17 is shown. Incidentally, this segment (boundary portion X), a trailing edge 15c of the side frame body portion 15 is divided into the trailing edge outward 15c ₁ and a trailing edge portion inner 15c _2. Further, the boundary portion X, the intermediate plate 17b is divided into intermediate plate outer 17b ₁ and the intermediate plate inner 17b _2. The frame extending portion C is constituted by the rear edge portion inner side 15c ₂ , the intermediate plate inner side 17b ₂ , and a part of the lower frame erection portion 18. In addition, the frame extension part C of this embodiment is composed of a part of the rear edge part inner side 15c ₂ , the intermediate plate inner side 17b ₂ , and the lower frame erection part 18 and is formed by joining a plurality of members. Although shown, all of these may be formed integrally.

  The boundary portion X is a portion having high rigidity in the seat frame F. Therefore, by forming the hole 15f and the side weak portion 15g at a position not overlapping the boundary portion X, the hole 15f and the side weak portion 15g can be easily deformed when an impact load is applied. .

Further, as shown in FIG. 4, the hole 15 f and the side fragile portion 15 g are formed in a portion of the side plate 15 a of the side frame main body 15 that is separated from the portion overlapping the intermediate plate 17 b of the frame base portion 17. Yes.
More specifically, as shown in FIG. 4, when the seat frame F is viewed from the side in the left-right direction, the fragile portion (on the side plate 15 a and at a position that does not overlap with the intermediate plate 17 b of the frame base portion 17). A hole 15f and a side fragile portion 15g) are formed. That is, the fragile portion (the hole portion 15f and the side fragile portion 15g) is formed above the upper end of the frame base portion 17 (portion indicated by a dotted line in FIG. 4).

  The part where the side plate 15a of the side frame main body part 15 and the frame base part 17 overlap is particularly high in rigidity, and when the weak part is formed in the part, it is difficult to sufficiently deform the weak part even if an impact load is applied. Sometimes. On the other hand, as described above, the fragile portion (the hole portion 15f and the side fragile portion 15g) is formed on the side plate 15a at a position where it does not overlap with the intermediate plate 17b of the frame base portion 17. When a load is applied, the fragile portion is easily deformed. As a result, the side frame body 15 can be more easily deformed, and impact energy can be effectively absorbed.

Further, the fragile portion (hole portion 15f, side fragile portion 15g) is a portion of the side plate 15a of the side frame main body portion 15 where the side airbag unit 50 overlaps when viewed from the lateral side. Is formed. In the present embodiment, as shown in FIG. 4, the fragile portions (the hole portions 15 f and the side fragile portions 15 g) are formed below the side airbag unit 50.
More specifically, the attachment portion 52 provided in the side airbag unit 50 is disposed at a position that does not overlap the fragile portion when the side frame main body portion 15 is viewed from the side in the left-right direction. That is, the fragile portion is formed below the attachment portion 52 of the side airbag unit 50. In addition, in FIG. 4, although the attachment part 52 illustrated the structure arrange | positioned in two places, it is not limited to this number, A weak part is among the attachment parts 52 provided with two or more. It is preferable that it is formed below the attachment portion 52 disposed at the lowest position.

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

As described above, the side airbag unit 50 includes the attachment portion 52 attached to the side frame body portion 15 and the body portion 51 in which the side airbag is accommodated.
Further, the fragile portion formed on the side plate 15a of the side frame main body portion 15 includes a hole portion 15f as a first fragile portion formed at the rear end portion of the side plate 15a and a hole portion 15f formed on the side plate 15a. The side weakened portion 15g as the second weakened portion is extended, but the attachment portion 52 of the side airbag unit 50 is disposed above and in front of the side weakened portion 15g. Has been.

  And the weak part (hole 15f, side weak part 15g) formed on the side plate 15a is formed behind the center (line A in FIG. 4) in the front-rear direction of the side plate 15a of the side frame main body part 15. ing. Further, the attachment portion 52 of the side airbag unit 50 is formed in front of a center line (line B in FIG. 4) that passes through the center of the main body portion 51 in the front-rear direction and extends in the vertical direction. The main body 51 is formed in a substantially rectangular shape in a side view, and a line B in FIG. 4 is a line that passes through the center of the main body 51 in the short direction and extends along the longitudinal direction of the main body 51. is there. Also, line A in FIG. 4 is a line that extends in the vertical direction through the center in the front-rear direction in the portion with the largest width in the front-rear direction on the side plate 15a of the side frame main body 15.

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

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

<< Configuration of Regulator 40 >>>
The side frame main body 15 is disposed at a position where a part of the fragile part having the above-described configuration (more specifically, the inner fragile part 15h) is sandwiched, and comes into contact with each other when the fragile part is deformed. A regulating unit 40 that regulates the deformation amount is provided.

  As described above, the restricting portion 40 (first restricting portion 41, second restricting portion 42) opposed to the rear surface of the rear edge portion 15c provided with the inwardly weakened portion 15h via the inner weakened portion 15h. Is provided. The restricting portions 40 (the first restricting portion 41 and the second restricting portion 42) face each other so as to sandwich the inner weak portion 15h, and are attached to the rear edge portion 15c by means of welding or the like. It is provided above and below the weakened portion 15h.

  At least one of the first restricting portion 41 and the second restricting portion 42 is disposed at the same height as the attachment portion 52 of the side airbag unit 50. In the present embodiment, as shown in FIG. 4, when the seat back frame 1 is in the normal seating position, the first restriction portion 41 is disposed at the same height as the attachment portion 52. More specifically, the side air bag unit 50 includes the first restricting portion 41 disposed above the first restricting portion 41 and the second restricting portion 42 constituting the restricting portion 40. Of the two attachment portions 52, the attachment portions 52 are disposed at the same height as the attachment portions 52 disposed below.

  Thus, when the seat back frame 1 is set to the normal seating position, the side airbag unit 50 is stabilized with respect to the seat back frame 1 by providing the attachment portion 52 and the restriction portion 40 at the same height position. It is possible to improve the mounting rigidity.

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

  In other words, the pair of restricting portions 40 provided to face each other via the inwardly weakened portion 15h, when the bending of the inwardly weakened portion 15h provided in the side frame main body portion 15 increases, The restricting portion 41 and the second restricting portion 42) are in contact with each other, and the second restricting portion 42 provided below is formed to press down the first restricting portion 41 provided above.

  The restricting portion 40 includes a first restricting portion 41 and a second restricting portion 42 each having restricting surfaces 41a and 42a disposed to face each other at a position sandwiching the inwardly fragile portion 15h. 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 15h is bent, there are provided restriction surfaces 41a and 42a for restricting the fragile portion 15h from bending over a certain amount. Therefore, for example, as shown in FIG. 4, the first restricting portion 41 and the second restricting portion 42 may be substantially trapezoidal members in a side view. Since the restricting surfaces 41a and 42a have larger areas, the restricting portions 40 (the first restricting portion 41 and the second restricting portion 42) are more likely to come into contact with each other when the inner weak portion 15h 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 inner weak portion 15h. 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 15h (that is, the width in the direction sandwiched between the first restricting portion 41 and the second restricting portion 42). Also, it is preferable to be formed small.

  Specifically, the lower end portion (that is, the restriction surface 41a) of the first restricting portion 41 provided at the upper side is disposed below the upper end portion of the inner weak portion 15h. On the other hand, the upper end portion (that is, the restricting surface 42a) of the second restricting portion 42 provided below is disposed above or substantially at the same height as the lower end portion of the inner weak portion 15h.

  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 inner weak portion 15h are arranged side by side. It is formed small.

  By adopting such a configuration, when the inner fragile portion 15h is bent in the vertical direction, as shown in FIG. 5, the regulating portions 40 arranged in the vertical direction of the inner fragile portion 15h (the first restriction) The part 41 and the second restricting part 42) can easily come into contact with each other, and the deformation of the inner weak part 15h can be prevented 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 regulation surface 42a) should just be formed in planar 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.

  In this way, when the inner fragile portion 15h is bent by making at least one of the restriction surfaces 41a (or the restriction surface 42a) of the first restriction portion 41 or the second restriction portion 42 into a flat shape, It becomes easy for the restricting portions 40 (the first restricting portion 41 and the second restricting portion 42) to come into contact with each other. As a result, the amount of bending of the inner weak portion 15h 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. 5, the restricting portion 40 including the restricting surfaces 41 a and 42 a formed in a flat shape deforms the inner weak portion 15 h 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 fragile portion 15h 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 fragile portion 15h). It extends further to the rear (on the opposite side to the inward fragile portion 15h) than the edge on the opposite side to the side where the is formed. By adopting such a configuration, the first restricting portion 41 firmly contacts the restricting surface 42a formed in a flat shape, so that the first restricting portion 41 is against the second restricting portion 42. Slipping and shifting are suppressed, and the deformation of the inner weak portion 15h can be suppressed more stably.

  In order to achieve the above configuration, for example, in a state before the impact energy is applied (normal state), a rear end side (a side opposite to the inward fragile portion 15h) of the restriction surface 42a of the second restriction portion 42 is an edge portion. Is formed to be behind (on the opposite side to the inner fragile portion 15h) the rear side (on the opposite side to the inner fragile portion 15h) of the first restricting portion 41 (on the opposite side to the inner fragile portion 15h). It is good to be.

In addition, although it is preferable if the restricting portion 40 is configured to be hollow, the vehicle seat S can be reduced in weight, but may be solid in order to ensure sufficient strength of the restricting portion 40. Moreover, as shown in FIG. 6, the hole may be provided in each control surface 41a and 42a for weight reduction.
Moreover, although the control part 40 showed the example provided only in the vicinity of the inner weak part 15h, you may be provided in the vicinity of the other weak part (hole 15f, side weak part 15g). At this time, it is only necessary that at least one of the hole portion 15f, the inner fragile portion 15h, and the side fragile portion 15g is disposed at a position sandwiched between the restricting portions 40.

<< Effects of weak part (hole 15f, side weak part 15g, inward weak part 15h) and regulating part 40 >>
A state in which the side frame body 15 is deformed when an impact load at the time of a rear collision is applied will be described below with reference to FIGS.
FIG. 6 illustrates a state before the impact load at the time of rear collision is applied to the side frame main body 15, and FIG. 7 illustrates a state after the impact load at the time of rear collision is applied to the side frame main body 15. At this time, a load in a backward tilt direction is mainly applied to the seat back frame 1, but a large load is applied to the side frame main body 15.

  Then, when a load is transmitted to the side frame main body 15, the laterally fragile portion 15g formed on the side plate 15a is deformed into a shape crushed in the vertical direction starting from the hole 15f, and the side plate 15a is moved in the horizontal direction. Deforms to spread outward. As described above, by providing the hole 15f and further providing the side weakened portion 15g on the side plate 15a, the side plate 15a can be easily spread outward in the left-right direction compared to the case where the hole 15f is not provided. .

  As described above, after the side plate 15a is deformed so as to spread outward in the left-right direction, the inner fragile portion 15h formed in the rear edge portion 15c is deformed so as to be crushed in the vertical direction (see FIG. 5), and as a result The side frame body 15 is bent and tilted backward, and the seat back frame 1 is deformed.

  Thus, in the side frame main body portion 15, not only the side weak portion 15 g and the hole portion 15 f but also the inner weak portion 15 h is further provided, so that the side frame main body portion 15 is gradually formed starting from the hole portion 15 f. 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 portion (specifically, the side weak portion 15g and the inner weak portion 15h) is stabilized. Can be deformed. As a result, it is possible to efficiently absorb the impact energy at the time of rear collision in the side frame main body 15.

  And when the inner weak part 15h bends as mentioned above, it is controlled by the control part 40 with which the rear edge part 15c was equipped so that the bending amount of the inner weak part 15h may not become large too much. That is, when an impact load at the time of a rear collision is applied, the side fragile portion 15h is bent so as to be crushed in the vertical direction, and the side frame main body portion 15 (and the seat back frame 1) tilts backward. When the one weak portion 15h is bent to a certain range, the pair of restricting portions 40 come into contact with each other, and the amount of bending of the inner weak portion 15h 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. Thus, by providing a configuration that sinks the occupant backward, it is possible to efficiently transmit impact energy due to a rear collision or the like to the seat back frame 1. As a result, the hole 15f, the side weak part 15g, and the inner weak part 15h formed in the side frame main body part 15 are deformed, and the impact energy can be absorbed more efficiently.

<< Other Embodiments >>
Hereinafter, another embodiment of the present invention will be described with reference to FIG.
Unlike the above embodiment in which the restricting portion 40 is provided in the side frame main body portion 15, as shown in FIG. 8, the side frame main body portion 115 is provided with another frame (erection frame 70) provided with the restricting portion 140. It is good also as a structure.

In the present embodiment, the side frame main body 115 includes a side plate 115a and a rear edge portion 115c, as in the above embodiment, and the side weak portion 115g and the inner weak portion on the side plate 115a and the rear edge portion 115c, respectively. A portion 115h is formed. The side plate 115a corresponds to the “frame side portion”, and the rear edge portion 115c corresponds to the “inner extension portion”.
Further, a hole 115f is formed in a rear end portion of the side plate 115a (more specifically, a connecting portion 115x between the side plate 115a and the rear edge portion 115c). The configuration and action of the hole 115f, the side weak portion 115g, and the inner weak portion 115h are the same as those of the hole 15f, the side weak portion 15g, and the inner weak portion 15h in the above embodiment. Is omitted.

  And the control part 140 is arrange | positioned in the position which pinches | interposes the inward weak part 115h formed in the rear edge part 115c in the up-down direction. More specifically, the upper erection frame 71 provided with the first restricting portion 141 and the lower erection frame 72 provided with the second restricting portion 142 are locked to the rear edge portion 115c of the side frame main body 115. As a result, the inner fragile portion 115h is sandwiched between the restricting portions 140.

  The erection frame 70 composed of the upper erection frame 71 and the lower erection frame 72 corresponds to the “frame erection part” of the present invention, and the upper erection frame 71 and the lower erection frame 72 are fragile portions (hole portions 115f, side fragile). 115g and the inner fragile portion 115h), and at least a position that does not overlap with the fragile portion when the side frame main body 115 is viewed from the lateral side. .

  The upper erection frame 71 and the lower erection frame 72 are respectively formed with locking portions to be locked to the side frame main body 115 at the end portions in the left-right direction. This locking portion may be fixedly joined to the rear edge portion 115c by means such as welding, or may be fastened using fastening means such as a bolt-nut.

  In addition, this latching | locking part is formed in the magnitude | size which does not overlap with the hole 115f and the inner weak part 115h at least. With this configuration, when an impact load is applied to the side frame main body 115, the impact energy is efficiently absorbed without hindering deformation of the fragile portions (the hole portion 115f, the side fragile portion 115g, and the inner fragile portion 115h). be able to.

  Further, since the pair of side frame main body portions 115 and 115 that are spaced apart from each other in the left-right direction are connected by the erection frame 70, an impact load in a complicated direction is applied to the side frame main body portion 115. However, the side frame main body portions 115 are not deformed independently, but the pair of side frame main body portions 115 and 115 are easily deformed integrally. Therefore, it becomes easy to control the deformation behavior of the side frame main body 115 with respect to the impact load.

<< Further Embodiment >>
Hereinafter, still another embodiment of the present invention will be described with reference to FIG.
In the above embodiment, the configuration in which the weakened portion and the restricting portion are formed in the side frame main body portions 15 and 115 has been described. However, as shown in FIG. 9, the weakened portion (hole portion 215f, side weakened portion 215g, inward side) The fragile portion 215h) and the restricting portion 240 may be formed on the seating side frame 160 constituting the seating frame 2.

The seating side frame 160 includes at least a side plate 160a extending in the front-rear direction and a rear edge portion 160b bent from the rear end portion of the side plate 160a toward the inner side in the left-right direction. The side plate 160a of the seating side frame 160 corresponds to the “frame side portion”, and the rear edge portion 160b corresponds to the “inner extension portion”.
And the hole 215f is formed in the rear-end part of the side plate 160a, Furthermore, the side weak part 215g extended from the hole 215f is formed in the side plate 160a. In addition, an inner fragile portion 215h extending from the hole 215f is formed in the rear edge portion 160b.
Note that the configuration and operation of the hole 215f, the side fragile portion 215g, and the inner fragile portion 215h are the same as those of the hole 15f, the side fragile portion 15g, and the inner fragile portion 15h in the above-described embodiment. Is omitted.

  The fragile portion (hole portion 215f, side fragile portion 215g, inward fragile portion 215h) has a height range (of the frame base portion 17) in which the frame foundation portion 17 and the lower frame erection portion 18 as the frame erection portion are disposed. And the lowermost end of the lower frame erection part 18). Further, at this time, the fragile portion (hole portion 215f, side fragile portion 215g, inner fragile portion 215h) may be formed below the reclining mechanism 11 provided on the side plate 160a.

  As described above, the fragile portion (hole portion 215f, side fragile portion 215g, inner fragile portion 215h) is provided below the frame base portion 17, the lower frame erection portion 18, and the reclining mechanism 11, thereby It becomes the structure by which a part with high rigidity is arrange | positioned upwards. As a result, when an impact load is applied to the seat frame F, the seat back frame 1 is easily tilted backward as a unit, so that the impact energy can be efficiently absorbed.

  Further, in order to regulate the deformation amount of the fragile portion, a regulating portion 240 including a first regulating portion 241 and a second regulating portion 242 is formed at a position where the inner fragile portion 215h is sandwiched. In addition, since the structure and effect | action of the control part 240 are the same as that of the said control part 40, the description is abbreviate | omitted.

  As described above, since the seating side frame 160 includes the restricting portion 240, when the fragile portion (hole portion 215f, side fragile portion 215g, inner fragile portion 215h) is deformed, the amount of deformation becomes too large. There is no. Therefore, when the seating side frame 160 is deformed by a large impact load, the influence on the seating posture of the occupant can be reduced by regulating the deformation amount.

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

S vehicle seat S1 seat back S2 seat S3 headrest F seat frame (frame)
X Boundary part C Frame extension part 1 Seat back frame 2 Seating frame 1a, 2a, 3a Cushion pad (pad material)
1b, 2b, 3b Skin material 11 Reclining mechanism 11a Reclining shaft 15, 115 Side frame main body 15a, 115a Side plate (frame side)
15b Front edge 15c, 115c Rear edge (inner extension)
15c ₁ Rear edge outside 15c ₂ Rear edge inside (frame extension)
15d Protrusion 15e Protrusion 15f, 115f, 215f Hole (first weak part, weak part)
15g, 115g, 215g Side vulnerable part (second vulnerable part, vulnerable part)
15h, 115h, 215h Inner vulnerable part (third vulnerable part, vulnerable part)
15x, 115x connecting part 16 upper frame 16a side part (frame side part)
16b Upper part (frame erection part)
17 Frame foundation 17a Side plate (frame side)
17b Intermediate plate (frame erection part)
17b ₁ intermediate plate outside 17b ₂ intermediate plate inside (frame extension)
17c Shaft insertion hole 17d, 17j Mounting hole 17i Harness mounting part 17x Connecting part 18 Lower frame erection part (frame extension part, frame erection part)
19 headrest pillar 19a pillar support part 20 pressure receiving member 21 wire (connection member)
21a Shaft support 22 Wire (connection member)
30 Moving member (impact reducing member)
32 Shaft 35 Tension coil spring (biasing means)
39 Movement prevention part 40,140,240 Restriction part 41,141,241 1st restriction part 41a Restriction surface (opposing part)
42, 142, 242 Second restricting portion 42a Restricting surface (opposing portion)
50 Side Airbag Unit 51 Main Body 52 Attachment Part 53 Fastening Means 60, 160 Seating Side Frame (Frame Side)
160a Side plate (frame side)
160b Rear edge (inner extension)
70 Construction frame (frame construction part)
71 Upper frame 72 Lower frame

According to the vehicle seat of the present invention, the subject is a vehicle seat comprising a seat back frame and a seating frame connected to the seat back frame, and the seat frame has an impact load. A fragile portion that is deformed when added is formed, and the fragile portion is solved by being positioned below the connecting portion with the seat back frame in the seating frame .

Further, in the above vehicle seat, the seating frame has a frame side portion located on the left and right sides, and the weakened portion is formed at a rear end portion of the frame side portion. Good.

In the above vehicle seat, a side airbag unit is attached to a side plate located on the left and right sides of the seat back frame, and the weakened portion is located at a position lower than a lower end of the side airbag unit. It is good to be formed in the back position.

In the above vehicle seat, the seating frame may have a frame side portion located on the left and right sides, and the weak portion may be formed by a recess provided in the frame side portion.

Further, in the above vehicle seat, there is provided a restricting portion that is disposed at a position sandwiching a portion of the fragile portion and regulates the deformation amount of the fragile portion by contacting each other when the fragile portion is deformed. It is good to be.

In the above vehicle seat, the seating frame may have a frame side portion located on the left and right sides, and the weak portion may be formed on an end surface of the frame side portion in the left-right direction.

In the above vehicle seat, the fragile portion formed on the end surface of the frame side portion may extend in the front-rear direction.

In the above vehicle seat, the seating frame has a frame side portion located on the left and right sides, and the weak portion includes a rear end portion of the frame side portion and the frame side portion in the left-right direction. It is good to be formed on both of the end faces.

In the above vehicle seat, the fragile portion formed at the rear end portion of the frame side portion and the fragile portion formed at the end surface of the frame side portion may be continuous with each other.

In the above vehicle seat, the fragile portion may be formed at a position lower than a lowermost end portion of the seat back frame.

In the above vehicle seat, the rail member is disposed below the seating frame, and is disposed between the seating frame and the rail member, and is connected to each of the seating frame and the rail member. It is good for the weak part to be formed above the part to which the connection member is connected in the seating frame.

According to the present invention, the frame is provided with a fragile portion (a portion that deforms when an impact load is applied) at a position avoiding a particularly rigid portion. Therefore, when the impact load is applied, the frame starts from the fragile portion. Becomes easier to deform. Therefore, a vehicle seat that can efficiently absorb impact energy can be provided .

According to the vehicle seat of the present invention, the subject is a vehicle seat including a seat back frame and a seating frame connected to the seat back frame, the seating frame being laterally lateral. The seat back frame is rotatable with respect to the seating frame, and the frame side portion of the seating frame has a fragile portion that deforms when an impact load is applied. The fragile portion is located below the connecting portion with the seat back frame in the seating frame, and at least a part of the fragile portion is configured such that the seat back frame rotates relative to the seat frame. This is solved by being located behind the center of rotation when moving .

Further, in the above-described vehicle seat, at least a portion of the front Symbol weakened portion, may that have been formed on the rear end portion of the frame side.

Further, in the above-described vehicle seat, the front Symbol fragile portion, may be formed by a recess provided in the frame side.

Further, in the above vehicle seat, the front Symbol fragile portion and is formed on the end face of the frame side in the lateral direction may.

Further, in the above-described vehicle seat, the front Symbol weakened portion, the rear end portion of the frame side, and, may be formed on both end faces of the frame side in the lateral direction.

Claims (10)

With a frame that deforms when an impact load is applied,
A frame side part located on the left-right side, and a frame extension part extending inward in the left-right direction from the frame side part,
A vehicular seat comprising a weakened portion that deforms when an impact load is applied at a position that does not overlap a connecting portion that connects the frame side portion and the frame extending portion. A frame erection part constructed between the frame side parts;
2. The vehicle seat according to claim 1, wherein the fragile portion is provided in a portion of the side portion of the frame where a portion overlapping the frame erection portion is removed.   The vehicle seat according to claim 1, wherein the weakened portion is formed at a rear end portion of the frame side portion. Having an inner extension extending from the rear end of the frame side toward the inner side in the left-right direction;
4. The vehicle seat according to claim 1, wherein at least a part of the fragile portion is formed in the inner extension portion. 5.   The vehicle seat according to claim 2, wherein the fragile portion is provided in a range outside a height range in which the frame erection portion is disposed.   The vehicle seat according to claim 2, wherein the fragile portion is provided below a height range in which the frame erection portion is disposed. Having a reclining mechanism attached to the side of the frame;
The vehicle seat according to claim 6, wherein the fragile portion is provided below the reclining mechanism. A pressure receiving member connected to the frame side portion via a connecting member and supporting an occupant;
An impact reducing member that is provided on the side of the frame and that is connected to the connecting member and moves the pressure receiving member backward by an impact load applied to the pressure receiving member;
The vehicle seat according to any one of claims 1 to 7, wherein the fragile part is formed below the impact reducing member. A side airbag unit provided on the side of the frame;
The vehicle seat according to any one of claims 1 to 8, wherein the fragile portion is formed below the side airbag unit.   2. The apparatus according to claim 1, further comprising a restricting portion that is disposed at a position sandwiching a portion of the fragile portion and restricts the amount of deformation of the fragile portion by contacting each other when the fragile portion is deformed. The vehicle seat according to any one of 1 to 9.

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