JP5808168B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat, and more particularly, to a vehicle seat that absorbs impact energy by sequentially deforming a first weak portion and a second weak portion provided in a frame 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 is configured by placing a cushioning material on a metal seat back frame and covering it with a skin material. Due to the movement, 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 reduced efficiently.

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

Japanese Patent No. 4200580

  However, since the seat back frame of Patent Document 1 cannot be deformed by limiting the deformation location (bending location) of the side frame, the seat back frame bends at an unspecified deformation location along the vertical direction of the side frame. As a result, since the bending point cannot be limited, the impact energy is transmitted to the entire seat back frame, the impact energy absorption efficiency is lowered, and it is difficult to reduce the impact energy stably.

  In response to the above problem (the problem found in the seat back frame disclosed in Patent Document 1), the present applicant relates to a technique for absorbing impact energy by deforming the seat back frame, and a flexible constricted portion. Has been proposed in which a constricted portion is bent preferentially when impact energy is applied, such as during a rear collision, and the impact energy is absorbed efficiently (Japanese Patent Application No. 2010-273867). . Thus, it becomes possible to absorb impact energy efficiently by limiting the deformation | transformation location of a seat back frame.

  In addition, for the purpose of more efficiently absorbing impact energy in the frame where the deformed portion is limited, the first weak portion deformed when the frame is deformed and the deformation of the first weak portion are transmitted as the deformed portion. The structure which provides the 2nd weak part which deform | transforms by doing is also considered. In such a configuration, from the viewpoint of efficiently absorbing impact energy, it is necessary to appropriately transmit the deformation of the frame that occurs from the first fragile portion to the second fragile portion from the first fragile portion. Therefore, as described above, with respect to the vehicle seat mounted with the frame provided with both the first fragile portion and the second fragile portion, the deformation that occurs at the time of a rear collision or the like is changed from the first fragile portion to the second fragile portion. There is a need for a technology that can properly transmit and realize smooth impact energy absorption.

  Therefore, the present invention has been made in view of the above problems, and the object of the present invention is to provide a rear surface for a vehicle seat equipped with a frame provided with both the first fragile portion and the second fragile portion. An object of the present invention is to provide a vehicle seat capable of appropriately transmitting deformation generated at the time of a collision from the first fragile portion to the second fragile portion and realizing smooth absorption of impact energy.

According to the vehicle seat of the present invention, the subject includes a frame that deforms when an impact load is applied, the first fragile portion that deforms when the frame is deformed by the impact load, and the first fragile portion. The second fragile portion that is deformed when the deformation of the portion is transmitted and the direction in which the deformation of the first fragile portion is transmitted are not deviated from the direction from the first fragile portion toward the second fragile portion. A direction restricting portion for restriction is provided in the frame, the first fragile portion is a hole formed in the frame, and the direction restricting portion is the first fragile portion in the frame. It is a member attached at a position deviated from a horizontal line connecting the second fragile portion, and of the outer edges of the direction regulating portion, the end located on the hole side is the edge of the hole portion, The flange is overlapped with the end on the second weak part side. That is attached to the over arm is solved by.
As described above, since the vehicle seat is provided with the above-described direction regulating portion, when the first fragile portion is deformed, the deformation is transmitted toward the second fragile portion. As a result, the frame is deformed starting from the first fragile portion, and then the second fragile portion is deformed, so that the deformation of the entire frame proceeds smoothly, thereby achieving a smooth absorption of impact energy. Will be.
In addition, as described above, if the direction regulating portion is attached at a position deviated from the horizontal line connecting the first fragile portion and the second fragile portion, the rigidity of the first fragile portion and the second fragile portion is relatively Since the first fragile portion and the second fragile portion are easily deformed, the deformation of the first fragile portion is easily transmitted to the second fragile portion. As a result, smoother energy absorption is achieved.
Furthermore, as described above, if the end located on the hole side among the outer edges of the direction restricting portion overlaps with the end on the second fragile portion side among the edges of the hole portion, it is the first fragile portion. It is possible to obtain the above-described effect (an effect of effectively exhibiting the function of the direction restricting portion) without inhibiting the deformation of the hole. Furthermore, since the direction restricting portion is disposed around the edge of the hole, it is possible to suppress a decrease in rigidity around the hole.

According to another vehicle seat of the present invention, the above-described problem includes a first fragile portion that includes a frame that deforms when an impact load is applied, and that deforms when the frame is deformed by the impact load. , A second fragile portion that is deformed by the deformation of the first fragile portion being transmitted, and a direction in which the deformation of the first fragile portion is transmitted from the first fragile portion toward the second fragile portion. A direction restricting portion for restricting so as not to be detached from the frame, the second weakened portion is a recess formed in a groove shape in the frame, and the direction restricting portion is provided in the frame. , A member attached at a position deviating from a horizontal line connecting the first fragile portion and the second fragile portion, and having a first opposed portion and a second opposed portion facing each other, and the first The facing portion and the second facing portion are It is a member attached to the frame to come into contact when the amount of deformation of the lem reaches a predetermined amount to regulate the amount of deformation, and is located at a position sandwiching the center line of the second fragile portion The distance between the first facing portion and the second facing portion is solved by being shorter than the opening width of the recess.
As described above, since the vehicle seat is provided with the above-described direction regulating portion, when the first fragile portion is deformed, the deformation is transmitted toward the second fragile portion. As a result, the frame is deformed starting from the first fragile portion, and then the second fragile portion is deformed, so that the deformation of the entire frame proceeds smoothly, thereby achieving a smooth absorption of impact energy. Will be.
In addition, as described above, if the direction regulating portion is attached at a position deviated from the horizontal line connecting the first fragile portion and the second fragile portion, the rigidity of the first fragile portion and the second fragile portion is relatively Since the first fragile portion and the second fragile portion are easily deformed, the deformation of the first fragile portion is easily transmitted to the second fragile portion. As a result, smoother energy absorption is achieved.
In addition, as described above, the first facing portion and the second facing portion are located at positions sandwiching the center line of the second fragile portion, so that both the upper side and the lower side of the second fragile portion are located. The transmission direction of the deformation of the first fragile portion is regulated so as not to deviate from the normal direction. As a result, smooth impact energy absorption is achieved.
In addition, as described above, the first facing portion and the second facing portion are attached to the frame in order to contact and regulate the deformation amount when the deformation amount of the frame reaches a predetermined amount. If it is a member, the number of parts will be reduced if the member which controls the transmission direction of a deformation | transformation of a 1st weak part is used as a member which controls the deformation amount of a sheet | seat.
Further, as described above, the second fragile portion is a recess formed in a groove shape in the frame, and a distance between the first facing portion and the second facing portion is larger than an opening width of the recessed portion. If it is shorter, when the amount of deformation when the frame is deformed due to the deformation of the recess reaches a predetermined amount, the first facing portion and the second facing portion are surely brought into contact with each other, and the frame It becomes possible to regulate the amount of deformation appropriately. That is, the first facing portion and the second facing portion are brought into contact with each other before the time when the concave portion, which is the second fragile portion, is completely deformed to stop the deformation of the frame, and the amount of deformation is constant. The following can be regulated (controlled).

According to another vehicle seat of the present invention, the above-described problem includes a first fragile portion that includes a frame that deforms when an impact load is applied, and that deforms when the frame is deformed by the impact load. , A second fragile portion that is deformed by the deformation of the first fragile portion being transmitted, and a direction in which the deformation of the first fragile portion is transmitted from the first fragile portion toward the second fragile portion. A direction restricting portion for restricting so as not to be detached from the frame, and the direction restricting portion deviates from a horizontal line connecting the first fragile portion and the second fragile portion in the frame. The frame includes a frame side portion that is located on the left and right sides and extends in the up-down direction, and a frame extension portion that extends from the frame side portion toward the inside in the left-right direction. And a seat back having The first fragile portion is a hole formed in a connecting portion that connects the frame side portion and the frame extension portion, and the second fragile portion is in contact with the hole portion, and This is solved by being a recess formed in a groove shape in the frame extension.
As described above, since the vehicle seat is provided with the above-described direction regulating portion, when the first fragile portion is deformed, the deformation is transmitted toward the second fragile portion. As a result, the frame is deformed starting from the first fragile portion, and then the second fragile portion is deformed, so that the deformation of the entire frame proceeds smoothly, thereby achieving a smooth absorption of impact energy. Will be.
In addition, as described above, if the direction regulating portion is attached at a position deviated from the horizontal line connecting the first fragile portion and the second fragile portion, the rigidity of the first fragile portion and the second fragile portion is relatively Since the first fragile portion and the second fragile portion are easily deformed, the deformation of the first fragile portion is easily transmitted to the second fragile portion. As a result, smoother energy absorption is achieved.
Furthermore, in the above configuration, when a shock load such as a rear impact is applied by forming a hole as the first weakened portion in the connecting portion that connects the frame side portion and the frame extending portion, The seat back frame can be easily bent backward and deformed. Here, in the seat back frame, the connecting portion between the frame side portion and the frame extending portion has high rigidity against a load along the extending direction (vertical direction) of the connecting portion. In general, when an impact load of rear collision is applied, the connecting portion is difficult to bend. Therefore, by providing a hole as the first fragile portion in the connecting portion, when an impact load generated at the time of a rear collision or the like is applied, the hole starts as a starting point and the deformation starts. When the deformation is transmitted to the concave portion as the second weakened portion and the concave portion is deformed, the seat back frame is deformed (backward tilted), and the impact energy is absorbed. In such a configuration, by providing the direction restricting portion, it is possible to transmit the deformation of the hole portion to the concave portion, smoothly deform the seat back frame, and achieve smooth absorption of impact energy.

According to another vehicle seat of the present invention, the above-described problem includes a first fragile portion that includes a frame that deforms when an impact load is applied, and that deforms when the frame is deformed by the impact load. , A second fragile portion that is deformed by the deformation of the first fragile portion being transmitted, and a direction in which the deformation of the first fragile portion is transmitted from the first fragile portion toward the second fragile portion. A direction restricting portion for restricting so as not to be detached from the frame, the second weakened portion is a recess formed in a groove shape in the frame, and the direction restricting portion is provided in the frame. , A member attached at a position deviating from a horizontal line connecting the first fragile portion and the second fragile portion, and having a first opposed portion and a second opposed portion facing each other, and the first The facing portion and the second facing portion are Located in a position across the center line of 2 fragile portion, of the recess, that is attached to the frame in a state sandwiching the end portion of the first weak portion, is solved by.
As described above, since the vehicle seat is provided with the above-described direction regulating portion, when the first fragile portion is deformed, the deformation is transmitted toward the second fragile portion. As a result, the frame is deformed starting from the first fragile portion, and then the second fragile portion is deformed, so that the deformation of the entire frame proceeds smoothly, thereby achieving a smooth absorption of impact energy. Will be.
In addition, as described above, if the direction regulating portion is attached at a position deviated from the horizontal line connecting the first fragile portion and the second fragile portion, the rigidity of the first fragile portion and the second fragile portion is relatively Since the first fragile portion and the second fragile portion are easily deformed, the deformation of the first fragile portion is easily transmitted to the second fragile portion. As a result, smoother energy absorption is achieved.
In addition, as described above, the first facing portion and the second facing portion are located at positions sandwiching the center line of the second fragile portion, so that both the upper side and the lower side of the second fragile portion are located. The transmission direction of the deformation of the first fragile portion is regulated so as not to deviate from the normal direction. As a result, smooth impact energy absorption is achieved.
Further, as described above, since the first facing portion and the second facing portion are attached to the frame with a part of the recess sandwiched therebetween, the first fragile portion is formed on both the upper side and the lower side of the recess. The transmission direction of deformation from the part is regulated so as not to deviate from the normal direction. Here, as described above, when the portion of the recess that is sandwiched between the first facing portion and the second facing portion is the end portion on the first fragile portion side, the deformation of the first fragile portion is transmitted. Since the direction is likely to deviate from the normal direction, the functions of the first facing portion and the second facing portion (function as the direction restricting portion) can be effectively exhibited, and smooth impact energy can be obtained. Absorption will be achieved.

  In addition, both the first fragile portion and the second fragile portion are provided in the frame in a state in which both are in contact with each other, and the first opposed portion and the second opposed portion are It is located on the side of the boundary portion located between the 1 fragile portion and the second fragile portion, and is attached to the frame with the end of the second fragile portion on the side of the first fragile portion being sandwiched It is good to be. Thus, if both the first fragile portion and the second fragile portion are in contact with each other, as described above, the deformation of the first fragile portion is the second fragile as compared to the case where both are separated from each other. It becomes easy to be transmitted to the part. Also, at the boundary portion located between the first fragile portion and the second fragile portion, the transmission direction of deformation of the first fragile portion is likely to deviate from the normal direction, so the first opposed portion and the second opposed portion Each function (function as a direction control part) comes to be exhibited effectively, and smooth impact energy absorption is achieved.

  In addition, with respect to the vehicle seat described above, the first facing portion and the second facing portion are attached to the frame in order to contact and regulate the deformation amount when the deformation amount of the frame reaches a predetermined amount. It is good also as being the member made. With this configuration, the number of parts can be reduced if the member that regulates the direction of transmission of deformation of the first fragile portion is also used as a member that regulates the amount of deformation of the sheet.

According to the present invention, since the deformation of the first fragile portion is reliably transmitted to the second fragile portion by the direction restricting portion, the frame is deformed from the first fragile portion, The second fragile portion is deformed, and the deformation of the entire frame proceeds smoothly, so that smooth absorption of impact energy is achieved.
Further , according to the present invention, the rigidity of the attachment portion of the direction restricting portion is higher than the rigidity of the first fragile portion and the second fragile portion, so the rigidity of the first fragile portion and the second fragile portion is relatively It is low. That is, since the first fragile portion and the second fragile portion are easily deformed, the deformation of the first fragile portion is easily transmitted to the second fragile portion, and smoother absorption of impact energy is achieved. .
Further , according to the present invention, the deformation of the first fragile portion is compared with the configuration in which the first fragile portion and the second fragile portion are separated from each other because the first fragile portion and the second fragile portion are in contact with each other. Can be easily transmitted to the second fragile portion, so that more smooth absorption of impact energy is achieved.
Further , according to the present invention, in the portion of the frame located beside the boundary portion located between the first fragile portion and the second fragile portion, the transmission direction of deformation from the first fragile portion is normal. Since the direction restricting portion is provided in such a part, the function of the direction restricting portion can be effectively exerted and smoothly. Absorption of impact energy is achieved.
Moreover, according to this invention, it becomes possible to acquire the effect of making the function of a direction control part exhibit effectively, without inhibiting the deformation | transformation of the hole which is a 1st weak part. Furthermore, since the direction restricting portion is disposed around the edge of the hole, it is possible to suppress a decrease in rigidity around the hole.
Further , according to the present invention, the first facing portion and the second facing portion are arranged at positions sandwiching the center line of the second fragile portion, so that both on the upper side and the lower side of the second fragile portion, The deformation transmission direction from the first fragile portion is regulated so as not to deviate from the normal direction. As a result, smooth impact energy absorption is achieved.
Moreover, according to this invention, the 1st opposing part and the 2nd opposing part are attached to a flame | frame in the state which pinched | interposed the edge part by the side of the 1st weak part among recessed parts, and the upper side and lower side of a recessed part In both cases, the deformation transmission direction from the first fragile portion is regulated so as not to deviate from the normal direction, and the functions of the first opposed portion and the second opposed portion (functions as direction regulating portions) are As a result, the impact energy can be absorbed smoothly.
Further , according to the present invention, the deformation of the first fragile portion is the second fragile portion as compared with the case where both the first fragile portion and the second fragile portion are in contact with each other, compared to the case where the both are separated. It becomes easy to be transmitted to. Moreover, each function (function as a direction control part) of a 1st opposing part and a 2nd opposing part comes to be exhibited effectively, and absorption of a smooth impact energy is achieved.
In addition, according to the present invention, if the member that regulates the transmission direction of the deformation of the first fragile portion is also used as a member that regulates the deformation amount of the sheet, the number of parts is reduced.
Further , according to the present invention, the first opposed portion and the second opposed portion come into contact with each other before the concave portion that is the second fragile portion is completely deformed, and the frame is prevented from being deformed. Is controlled (controlled) to a certain amount or less.
Further , according to the present invention, by providing a hole as the first fragile portion in the connecting portion between the frame side portion and the frame extending portion, when an impact load generated at the time of a rear collision or the like is applied, Deformation is started with the hole as a starting point, the deformation of the hole is transmitted to the concave portion as the second weakened portion, and the concave portion is deformed, whereby the seat back frame is deformed (backward tilted), As a result, the impact energy is absorbed. In such a configuration, by providing the direction restricting portion, it is possible to transmit the deformation of the hole portion to the concave portion to smoothly deform the seat back frame, thereby achieving smooth absorption of impact energy.

It is a schematic perspective view of the vehicle seat which concerns on this embodiment. It is a schematic perspective view of the seat frame concerning this embodiment. It is a rear view of the seat frame concerning this embodiment. It is a schematic perspective view of the lower frame base part concerning this embodiment. It is sectional drawing by the AA line of FIG. It is explanatory drawing which shows the state after the rear surface collision of the lower frame base part which concerns on this embodiment. It is explanatory drawing which shows the state before the rear surface collision of the lower frame which concerns on this embodiment. It is explanatory drawing which shows the state after the rear surface collision of the lower frame which concerns on this embodiment. It is a figure which shows the condition when a deformation | transformation is not transmitted appropriately. It is explanatory drawing regarding the attachment position of a control part. It is a figure which shows the other example regarding the attachment position of a control part. It is a figure which shows the modification of a control part. It is explanatory drawing of the lower frame base part which concerns on other embodiment. It is explanatory drawing of the lower frame base part which concerns on other embodiment. It is explanatory drawing of the lower frame base part which concerns on other embodiment. It is explanatory drawing of the lower frame base part which concerns on other embodiment.

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

  1 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, FIG. 4 is a schematic perspective view of a lower frame base, and FIG. FIG. 6 is an explanatory view showing a state after a rear collision of the lower frame base, FIG. 7 is an explanatory view showing a state before the rear collision of the lower frame, and FIG. 8 is a view after a rear collision of the lower frame. It is explanatory drawing which shows a state. 9 is a diagram illustrating a situation when the deformation is not properly transmitted, FIG. 10 is an explanatory diagram regarding the mounting position of the restricting portion, and FIG. 11 is a diagram illustrating another example regarding the mounting position of the restricting portion. These are figures which show the modification of a control part. FIGS. 13 to 16 relate to another embodiment of the present invention and are explanatory views of a lower frame base portion.

<< Basic configuration of vehicle seat S >>
With reference to FIG. 1 thru | or FIG. 8, the vehicle seat S which concerns on embodiment is demonstrated.
As shown in FIG. 1, the vehicle seat S includes a seat back S <b> 1 (back portion), a seating portion S <b> 2, and a headrest S <b> 3. The seat back S <b> 1 (back portion) and the seating portion S <b> 2 , 2a are placed and covered with skin materials 1b, 2b. The headrest S3 is formed by arranging a pad material 3a on a core material (not shown) of the head and covering it with a skin material 3b. Reference numeral 19 denotes a headrest pillar that supports the headrest S3.

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

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

  The seat back S1 has the cushion pad 1a mounted on the seat back frame 1 as described above and is covered with the skin material 1b from above the cushion pad 1a, and supports the back of the occupant from the rear. . And, as will be described later, the seat back frame 1 according to the present embodiment is configured to be deformed (reversely tilted) and absorb the impact energy when an impact load is applied at the time of a rear collision or the like. Has been.

  In the present embodiment, the seat back frame 1 is a substantially rectangular frame as shown in FIG. 2, and includes a side frame 15, an upper frame 16, and a lower frame, and the lower frame is a lower frame. The frame base portion 17 and the lower frame erection portion 18 are configured. Details of the lower frame will be described later.

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

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

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

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

The front edge 15b of the present embodiment is formed with a protrusion 15d that protrudes toward the rear edge 15c, and this protrusion 15d is used to lock a tension coil spring 35 as a biasing means. A locking hole as a locking portion is formed.
And the below-mentioned moving member 30 is latched by the side frame 15 of this embodiment. The configuration and operation of the moving member 30 will be described later.

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

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

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

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

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

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

  As shown in FIG. 2, of the two wires 21 and 22 locked to the pressure receiving member 20 of the present embodiment, both ends of the wire 21 locked to the upper side are provided on the side frames 15 on both sides. It is hooked on the supported shaft 21a. On the other hand, both ends of the wire 22 locked to the lower side are hooked to a moving member 30 mounted on the left and right side frames 15.

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

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

As shown in FIG. 2, the moving member 30 of the present embodiment is pivotally supported on the inner side of the side plates 15a of the side frames 15 on both sides via a shaft portion 32 as a rotating shaft, and serves as a connecting member. The wire 22 in the lower position of the wire is locked and is connected to a spring (a tension coil spring 35) as a biasing means for biasing the wire 22. That is, the moving member 30 is connected to the urging means 35, and is configured to urge the pressure receiving member 20 toward the front side of the seat back frame 1 through the wire 22 as a connecting member.
The moving member 30 according to the present embodiment is configured so that a pivotable shaft portion 32 is pivoted on a convex portion 15e formed by bulging a part of the side plate 15a on the inner side of the side frame 15 and more specifically on the inner side of the seat. It is supported.

  The moving members 30 described above are attached to the side frames 15 on both sides, and both ends of the wire 22 are hooked on the moving members 30 arranged on both sides, respectively. It is configured to move (turn). For this reason, when the load is generated in the left-right direction, the moving members 30 attached to the side frames 15 on both sides independently move (rotate) in accordance with the load. Depending on the size, the occupant's body can be sunk backwards.

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

And the movement prevention part 39 with which the moving member 30 was equipped is a contact part which contacts the rear edge part 15c of the side frame 15 after movement (rotation) of the movement member 30, and blocks | prevents movement (rotation). .
The movement preventing portion 39 of the moving member 30 is integrally formed by extending the moving member 30 in the outer circumferential direction, and the side surface 15 (more specifically, the rear edge) after the contact surface moves (rotates). Since it abuts against the portion 15c), the movement (rotation) of the moving member 30 can be stably stopped even when an impact load of a predetermined level or more is applied to the pressure receiving member 20 due to a rear collision or the like.
The movement preventing portion 39 is formed at a position where it does not interfere with the urging means (the tension coil spring 35) and the connecting member (the wire 22).

  In the present embodiment, the movement preventing portion 39 of the moving member 30 is configured to directly contact the side frame 15 to prevent movement (turning), but the movement preventing portion 39 and the side frame 15 In order to eliminate the noise generated during the contact, a silencer such as a rubber having a thickness that does not hinder the stability of the movement (rotation) stop of the moving member 30 can be attached. If it comprises, the stable movement (rotation) prevention can be performed, and the silencing effect can be expected.

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

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

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

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

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

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

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

<< Configuration of lower frame >>
The lower frame of the seat back frame 1 includes a lower frame base portion 17 and a lower frame erection portion 18. The lower frame erection part 18 (member center) is formed so as to connect a pair of lower frame base parts 17 spaced apart in the left-right direction, and is provided in contact with the lower frame base part 17. ing. The lower frame base portion 17 is connected to the lower side of the side plate 15 a of the side frame 15. And the lower frame base part 17 is formed so that the downward direction of the side plate 15a may be extended, and is extended in the range which does not have trouble in relation to the seating frame 2. FIG.
In the seat back frame 1 of the present embodiment, the side frame 15 and the lower frame base portion 17 are formed as separate members, but may be formed as an integral plate frame or the like. Moreover, although the lower frame base part 17 and the lower frame installation part 18 show the example formed as a separate member, respectively, it is good also as a structure formed integrally.

  The vehicle seat S of the present invention includes a fragile portion (a hole portion 17k, an inner fragile portion 17e, a side fragile portion 17m described below) that deforms when the seat back frame 1 is deformed by an impact load, and a fragile portion. And a restricting portion (a restricting portion 40 described below) that restricts the deformation amount of the fragile portion. Below, especially the structure by which the weak part and the control part were formed in the lower frame base part 17 which comprises a lower frame is demonstrated. In the present specification, the `` fragile portion '' refers to a portion having a fragility that selectively deforms when an impact load of a predetermined size or more is applied, such as during a rear collision, It is formed by a hole, a recess or the like.

(Configuration of lower frame base 17)
The lower frame base portion 17 constituting the lower frame includes a pair of side plates 17a as frame side portions and a pair of intermediate plates 17b as frame extension portions. Each of the pair of side plates 17a is positioned on the left and right sides of the seat back frame 1 and extends in the vertical direction (front-rear direction). Moreover, each of a pair of intermediate | middle board 17b is extended toward the inner side of the left-right direction from the side board 17a.

  Then, as shown in FIG. 4, the lower frame base portion 17 is a fragile portion that connects the side plate 17a and the intermediate plate 17b and is connected between the connecting portions 17x (that is, between the side plate 17a and the intermediate plate 17b). A hole portion 17k as a first fragile portion formed on the corner portion), and an inner fragile portion 17e as a second fragile portion formed on the intermediate plate 17b in contact with the hole portion 17k. doing.

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

  The lower frame base portion 17 is formed by bending the side plate 17a joined to the side plate 15a of the side frame 15 and the inner side of the side frame 15 substantially perpendicularly from the rear end portion of the side plate 17a. And an intermediate plate 17b. A shaft insertion hole 17c through which the reclining shaft 11a is inserted is formed below the side plate 17a, and the seating frame 2 is disposed below the side plate 17a via the reclining mechanism 11.

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

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

In the present invention, the fragile portion (that is, the hole portion 17k, the inner fragile portion 17e, and the side fragile portion 17m) is between the reclining mechanism 11 and the side frame 15 (more specifically, the shaft insertion hole 17c and (Between the mounting holes 17d). That is, each weak part is formed above the reclining mechanism 11. With such a configuration, the lower portion of the seat back frame 1 is fixed by the reclining mechanism 11, so that the seat back frame 1 above the weakened portion can be easily tilted backward.
Furthermore, since each fragile portion is formed between the seating frame 2 and the side frame 15, when an impact load is applied, deformation of each fragile portion is not hindered by the seating frame 2 or the side frame 15, It can absorb impact energy efficiently.

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

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

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

  And the horizontal part 17f which comprises the inward weak part 17e has a part of the inward weak part 17e (more specifically, the horizontal part 17f) in the edge part on the side facing the bending part 17g in the longitudinal direction. It is cut out. The notched portion is a hole portion 17k, and the hole portion 17k and the inward weakened portion 17e are formed so as to be in contact (continuous). As described above, since the inwardly weakened portion 17e and the hole portion 17k are formed in contact with each other, when an impact load such as a rear collision is applied to the lower frame base portion 17, as described below, The inner fragile portion 17e of the lower frame base portion 17 is deformed starting from the portion 17k to absorb impact energy. That is, the hole portion 17k is deformed when the seat back frame 1 is deformed by an impact load, and the inwardly weak portion 17e is deformed by transmitting the deformation of the hole portion 17k.

  In addition, although the hole part 17k was shown as a 1st weak part of this embodiment, the 1st weak part does not necessarily need to be formed by the hole. The first fragile portion may be formed so as to be deformed by a smaller impact load than the inner fragile portion 17e that is the second fragile portion and the side fragile portion 17m that is the third fragile portion. It is good also as a structure formed by the board | plate thickness thinner than the weak part 17e and the side weak part 17m, or the structure formed by the recessed part deeply dented. In the present embodiment, the first fragile portion and the second fragile portion are formed so as to be in contact (continuous), but the present invention is not limited to this, and the first fragile portion and the second fragile portion have a gap. It may be a configuration in which they are spaced apart (in a discontinuous state) (see FIG. 11).

  The horizontal portion 17f can be bent and deformed so as to be crushed in the vertical direction when a predetermined impact load (a large impact load at the time of normal seating) is applied to the seat back frame 1 such as a rear collision. (See FIG. 6). As a result, the rearward load can be stably and efficiently absorbed. Further, since the horizontal portion 17f extends along the seat width direction, that is, the longitudinal direction of the lower frame erection portion 18, even when a load in the left-right direction is applied, the load is received at the ridge line portion. Therefore, the rigidity of the lower frame base portion 17 against the load in the seat width direction is extremely improved.

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

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

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

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

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

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

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

Further, on the opposite side of the bending portion 17g in the bending direction (downward in FIGS. 3 and 4), a harness mounting portion 17i as a bulging component mounting portion is formed. At this time, the harness attachment portion 17i is formed so as to bulge to the opposite side of the bulging direction of the inner weak portion 17e. That is, a harness attachment portion 17i is formed below the bent portion 17g so as to bulge backward. Thus, in the intermediate plate 17b, the harness attaching portion 17i is formed on the side opposite to the direction in which the bent portion 17g of the inward fragile portion 17e is bent (that is, the obtuse angle side formed by the horizontal portion 17f and the inclined portion 17h). As a result, a plurality of uneven shapes are formed on the intermediate plate 17b, and the rigidity of the lower frame base portion 17 with respect to the load (particularly, the rigidity in the vicinity of the bent portion 17g) is improved. As a result, when an impact load such as a rear collision is applied, it is difficult to bend portions other than the inner fragile portion 17e, and the horizontal portion 17f, the bent portion 17g, and the inclined portion 17h of the inner fragile portion 17e are selectively selected. Bends.
Note that the harness mounting portion 17i is not located above the bent portion 17g for the purpose of improving rigidity below the upper side of the intermediate plate 17b in order to make the side frame 15 particularly easy to tilt backward due to the impact load at the time of rear collision. It is preferable to be provided below.

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

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

  As described above, on the rear surface of the intermediate plate 17b provided with the inner fragile portion 17e, the amount by which the inner fragile portion 17e is crushed (that is, the rearward tilt angle of the intermediate plate 17b and the seat back frame 1) is a certain amount or more. A restricting portion 40 for restricting the size from increasing is provided. The restricting portion 40 includes a first facing portion 41 and a second facing portion 42 that face each other via the inwardly fragile portion 17e. Each opposing part 41 and 42 is attached on the intermediate | middle board 17b in the state which pinched | interposed the inner weak part 17e, and is each located in the upper and lower sides of the inner weak part 17e.

  That is, in this embodiment, the 1st opposing part 41 and the 2nd opposing part 42 are located in the position which pinched | interposed the centerline of the 2nd weak part (namely, inward weak part 17e). Here, the center line of the second fragile portion refers to the inner fragile portion 17e, which is the second fragile portion, when viewed from the front (that is, viewed from the direction shown in FIG. 10), and its width direction (vertical direction). A virtual line passing through the center.

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

  That is, the pair of facing portions (the first facing portion 41 and the second facing portion 42) provided to face each other via the inward weakened portion 17e has a large bend of the inward weakened portion 17e, and the seat back frame 1 When the deformation amount (backward tilt amount) reaches a predetermined amount, the facing portions 41 and 42 come into contact with each other, and the second facing portion 42 provided below pushes the first facing portion 41 provided above. It is arranged to stop. Thereby, the deformation amount (backward tilt amount) of the seat back frame 1 is regulated. As described above, the first facing portion 41 and the second facing portion 42 are members attached to the seat back frame 1 in order to restrict the deformation amount.

  More specifically, each of the pair of facing portions 41 and 42 has restriction surfaces 41a and 42a that are disposed to face each other at a position sandwiching the inner weak portion 17e. In other words, the first facing portion 41 and the second facing portion 42 are in contact with the facing portions (the first facing portion 41 or the second facing portion 42) disposed to face each other, and the inward fragile portion 17e is bent. In this case, there are provided regulating surfaces 41a and 42a for regulating the bending so as not to bend a certain amount or more. Therefore, for example, as shown in FIG. 5, the first facing portion 41 and the second facing portion 42 may be members that are rectangular in front view and substantially trapezoidal in side view. Since the restricting surfaces 41a and 42a have larger areas, the opposing portions (the first opposing portion 41 and the second opposing portion 42) are more likely to come into contact with each other when the inner weak portion 17e is bent. It is possible to appropriately regulate the deformation amount (backward tilt amount).

  As described above, the restricting portion 40 including the first facing portion 41 and the second facing portion 42 disposed to face each other in the vertical direction has the restricting surfaces 41a and 42a formed at the positions sandwiching the inner fragile portion 17e. Each has. The distance between the two restricting surfaces 41a and 42a is smaller than the width in the height direction of the inwardly fragile portion 17e (that is, the width in the direction sandwiched between the first facing portion 41 and the second facing portion 42). Is formed.

  Specifically, the lower end portion (that is, the regulation surface 41a) of the first facing portion 41 provided at the upper side is disposed below the upper end portion of the inward weakened portion 17e (more specifically, the horizontal portion 17f). Is done. On the other hand, the upper end portion (that is, the regulating surface 42a) of the second facing portion 42 provided below is above or substantially the same height as the lower end portion of the inwardly weakened portion 17e (more specifically, the horizontal portion 17f). Arranged. In addition, in FIG. 5, the regulation surface 42a of the 2nd opposing part 42 with which the downward direction is shown in the state arrange | positioned in the substantially same height as the lower end part of the inward weak part 17e.

  That is, the distance between the 1st opposing part 41 and the 2nd opposing part 42 is formed shorter than the width | variety (opening width) of the direction in which a pair of opposing part of the inward weak part 17e is arranged in parallel. In other words, in FIG. 5, the distance α between the opposing regulating surfaces 41a and 42a and the vertical width β of the inwardly weakened portion 17e are formed such that α <β.

  By adopting such a configuration, when the inner fragile portion 17e is bent in the vertical direction, as shown in FIG. 6, the opposing portions disposed in the vertical direction of the inner fragile portion 17e (the first opposing portion 41). , The second facing portion 42) can easily come into contact, and the deformation of the inner weak portion 17e 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 facing portion 41 and the second facing portion 42 is illustrated, but at least one of the regulation surfaces 41a (or The regulating surface 42a) may be formed in a flat shape.
That is, the restriction surface 41a (or the restriction surface 42a) provided on at least one of the first facing portion 41 and the second facing portion 42 is formed in a planar shape.

  Thus, when the inner fragile portion 17e is bent by making the restriction surface 41a (or the restriction surface 42a) of at least one of the first facing portion 41 and the second facing portion 42 flat. The opposing parts (the first opposing part 41 and the second opposing part 42) can easily come into contact with each other. As a result, the amount of bending of the inner weak portion 17e is limited, and the amount of deformation of the seat back frame 1 does not become larger than the specified value.

  As shown in FIG. 6, in the restricting portion 40 including the restricting surfaces 41 a and 42 a formed in a flat shape, the inner weak portion 17 e is deformed by applying an impact load, and the first facing portion 41 is the second facing portion. When abutting on the portion 42, the first facing portion 41 is formed so as to abut on a regulation surface 42a formed in a flat shape. That is, when the inner weak portion 17e is deformed, the regulation surface 42a of the second opposing portion 42 with which the first opposing portion 41 abuts is at least the rear side of the first opposing portion 41 (that is, the inner weak portion 17e is formed. It extends further to the rear (on the opposite side to the inward weakened portion 17e) than the edge on the opposite side. By adopting such a configuration, the first facing portion 41 is firmly in contact with the regulation surface 42a formed in a flat shape, so that the first facing portion 41 is slipped and displaced with respect to the second facing portion 42. And the deformation of the inner fragile portion 17e can be suppressed more stably.

  In order to achieve the above configuration, for example, in the state before the impact energy is applied (normal state), the rear end side (the side opposite to the inward fragile portion 17e) of the regulation surface 42a of the second facing portion 42 is formed. The first opposing portion 41 is formed so as to be rearward (opposite to the inner fragile portion 17e) behind the regulating surface 41a (opposite to the inner fragile portion 17e). Good.

In addition, as shown in FIG.5 and FIG.6, if it is set as the structure formed hollow about each opposing part (1st opposing part 41, 2nd opposing part 42), the vehicle seat S can be reduced in weight. Although it is preferable because it is possible, it may be solid in order to sufficiently secure the strength of the restricting portion 40. Moreover, as shown in FIG. 4, the hole may be provided in each control surface 41a, 42a for weight reduction.
Moreover, although the control part 40 showed the example provided only in the vicinity of the inward weak part 17e, you may be provided in the vicinity of the other weak part (hole part 17k, side weak part 17m). At this time, at least one of the hole portion 17k, the inner fragile portion 17e, and the side fragile portion 17m may be disposed at a position sandwiched between the restricting portions 40.

  A lower frame erection part 18 is joined to the side plate 17 a or the intermediate plate 17 b of the pair of lower frame bases 17. The lower frame erection part 18 is preferably joined to both the side plate 17a and the intermediate plate 17b because the mounting rigidity is improved. Furthermore, if the side edge of the lower frame erection part 18 is formed so as to abut against the side plate 17a, the rigidity is improved with respect to the side load. In the present embodiment, the lower frame erection portion 18 is disposed in front of the intermediate plate 17b, but may be disposed in the rear of the intermediate plate 17b.

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

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

  The side fragile portion 17m has a substantially semicircular cross section like the inner fragile portion 17e, and is recessed so as to be recessed from the inside toward the outer side of the side frame 15 in the left-right direction (sheet width direction). And the side weak part 17m is formed so that it may extend linearly toward the front from back. In other words, the side weakened portion 17 m is a concave portion that extends along the front-rear direction and is formed below the side frame 15. The hole 17k, the inner fragile portion 17e, and the side fragile portion 17m are all formed at the same height. As described above, the three weak portions (the hole portion 17k, the inner weak portion 17e, and the side weak portion 17m) are formed at the same height, so that the seat back frame 1 is particularly stably tilted backward (deformed). The impact energy can be absorbed efficiently.

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

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

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

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

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

  As described above, the lower frame base portion 17 includes not only the inner weak portion 17e and the hole portion 17k but also the side weak portion 17m, so that the lower frame base portion 17 is stepped from the hole portion 17k as a starting point. It can be easily deformed and can efficiently absorb impact energy. A complicated input load is applied to the seat back frame 1 at the time of a rear collision, etc., but by providing the above configuration, a specific portion (specifically, the horizontal portion 17f of the inward weakened portion 17e) is stably deformed. Making it easier to do. As a result, the impact energy at the time of the rear collision can be efficiently absorbed by the lower frame base portion 17.

  And when the inner weak part 17e bends as mentioned above, it is controlled by the control part 40 with which the intermediate | middle board 17b was equipped so that the bending amount of the inner weak part 17e may not become large too much. That is, when an impact load at the time of a rear collision is applied, the inwardly fragile portion 17e is bent so as to be crushed in the vertical direction, and the side frame 15 (and the seat back frame 1) tilts backward, but the inwardly fragile When the portion 17e is bent to a certain range, the pair of opposing portions (the first opposing portion 41 and the second opposing portion 42) come into contact with each other, and the amount of bending of the inner fragile portion 17e is restricted. Therefore, by providing the restricting portion 40 including the pair of facing portions 41 and 42, the amount of backward inclination can be set to an appropriate size without the amount of backward inclination of the seat back frame 1 becoming excessively large.

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

<< About the function of the regulation part 40 >>
The restriction portion 40 described above includes a pair of opposed portions (a first opposed portion 41 and a second opposed portion 42), and deformation when the seat back frame 1 is deformed by an impact load due to contact between the opposed portions. The amount is regulated. Further, the restricting portion 40 restricts the deformation transmission direction from the hole portion 17k as the first fragile portion that is deformed when the seat back frame 1 is deformed, and the deformation of the hole portion 17k is the inner portion as the second fragile portion. It has a function to be transmitted to the weak portion 17e. That is, the restricting portion 40 also functions as a direction restricting portion that restricts the direction in which the deformation of the hole 17k is transmitted from being deviated from the direction from the hole 17k toward the inward fragile portion 17e. The function as a direction control part which the control part 40 comprises is demonstrated referring FIG.9 and FIG.10.

  Regarding the structure of the seat back frame 1, as described above, when an impact load is applied at the time of a rear collision or the like, first, the hole 17 k as the first fragile portion is deformed as a starting point, and then the deformation is performed. When transmitted to the inner fragile portion 17e as the second fragile portion, a structure is adopted in which the inner fragile portion 17e is deformed so as to be bent. With this structure, when an impact load is applied, the seat back frame 1 is deformed so as to tilt backward, and the deformation can absorb impact energy.

  Here, when the impact load is applied, the seat back frame 1 is smoothly deformed, and the impact energy is quickly absorbed. In addition, the inwardly fragile portion is formed from the hole 17k serving as a starting point when the seat back frame 1 is deformed. The deformation needs to be transmitted to 17e. For this reason, the hole 17k and the inwardly weakened portion 17e are formed in a state of being arranged on a predetermined portion (specifically, the intermediate plate 17b) of the seat back frame 1, and particularly in the present embodiment, they are in contact with each other ( The seat back frame 1 is provided in a continuous state. With such a configuration, the deformation of the hole portion 17k is easily transmitted to the inner fragile portion 17e, compared to a configuration in which the hole portion 17k and the inner fragile portion 17e are separated from each other. Absorption of impact energy is achieved.

  However, since a complicated input load is applied to the seat back frame 1 at the time of a rear collision or the like, as shown in FIG. 9, the deformation of the hole 17k is not transmitted to the inner fragile portion 17e, and other than the inner fragile portion 17e. There is a possibility that the part may be deformed. As described above, when a portion other than the inner weak portion 17e is deformed, the advantage of providing the inner weak portion 17e, that is, the impact energy can be efficiently obtained by limiting the deformed portion of the seat back frame 1 to the weak portion. The effect that it becomes possible to absorb is no longer used.

  Therefore, in the present embodiment, the function of the direction restricting portion that restricts the direction in which the deformation of the hole 17k is transmitted so that the deformation of the hole 17k is transmitted to the inwardly weakened portion 17e is described above. 40. In other words, in the present embodiment, the restricting portion 40 (more specifically, the first facing portion 41 and the second facing portion 42 described above) serving as a member that restricts the deformation amount of the seat back frame 1 is replaced with the hole 17k. It also serves as a direction restricting portion that restricts the direction in which the deformation is transmitted. Accordingly, there is no need to separately provide a member for regulating the deformation amount of the seat back frame 1 and a member for regulating the direction in which the deformation of the hole 17k is transmitted, and the number of parts of the vehicle seat S can be reduced. It becomes possible to reduce.

  The function as the direction restricting portion provided in the restricting portion 40 is effectively exhibited by the mounting position of the restricting portion 40 in the seat back frame 1. More specifically, each of the facing portions 41 and 42 constituting the restricting portion 40 in the seat back frame 1 connects the hole portion 17k that is the first fragile portion and the inner fragile portion 17e that is the second fragile portion. It is attached at a position deviating from a straight line (see FIG. 10). Here, the horizontal line connecting the hole portion 17k and the inner weak portion 17e is the hole portion when the inner weak portion 17e is viewed from the front (that is, when viewed from the direction shown in FIG. 10). 17k and the inner fragile portion 17e, and the first facing portion 41 and the second facing portion 42 are not located on the above-described virtual straight line, in particular, at positions around the hole portion 17k. It is attached.

  Here, the rigidity of the part of the seat back frame 1 to which the restricting portion 40 (specifically, the first facing portion 41 and the second facing portion 42) is attached is such that the hole portion 17k and the inner weak portion 17e are rigid. It is higher than the rigidity. In other words, the holes 17k and the inner weak parts 17e have relatively low rigidity, and are easily deformed when an impact load is applied. That is, the direction restricting portion according to the present embodiment increases the rigidity of a portion that is not located on the imaginary straight line connecting the hole portion 17k and the inwardly weak portion 17e, in particular, the peripheral portion of the hole portion 17k. By making it difficult to deform, the hole portion 17k and the inner fragile portion 17e are relatively easily deformed, thereby facilitating the transmission of the deformation from the hole portion 17k to the inner fragile portion 17e. As a result, the direction of transmission of deformation of the hole 17k is restricted so as not to deviate from the direction from the hole 17k toward the inwardly weakened portion 17e.

  In particular, in the present embodiment, the first facing portion 41 and the second facing portion 42 are located in the seat back frame 1 at a position sandwiching the inner weak portion 17e (strictly speaking, the center line of the inner weak portion 17e is It is arranged at the sandwiched position). Specifically, the 1st opposing part 41 is located above the inner weak part 17e, and the 2nd opposing part 42 is located below. In this way, on both the upper side and the lower side of the inner fragile portion 17e, the transmission direction of deformation from the hole portion 17k does not deviate from the normal direction (the method from the hole portion 17k toward the inner fragile portion 17e). Will be regulated. As a result, smoother absorption of impact energy is achieved.

  The mounting position of the restricting portion 40 in the present embodiment will be further described. The above-described effect (the effect of reliably transmitting the deformation of the hole 17k to the inwardly fragile portion 17e) is set to a position where it is more effectively exhibited. Has been. Specifically, as shown in FIG. 10, the restricting portion 40 (specifically, the first facing portion 41 and the second facing portion 42) is inwardly fragile with the hole portion 17 k in the seat back frame 1. It is attached to the part located beside the boundary part 17n located between the part 17e. Here, being located beside the boundary portion 17n means that the boundary portion 17n is juxtaposed in the left-right direction and is lined up through the boundary portion 17n in the up-down direction (a part of the boundary portion 17n as shown in FIG. 10). It is arranged in the state (including the approaching state).

  As described above, since the restricting portion 40 as the direction restricting portion is located beside the boundary portion 17n, the function as the direction restricting portion is effectively exhibited, and smooth absorption of impact energy is achieved. More specifically, in the seat back frame 1, at a portion located beside the boundary portion 17 n located between the hole portion 17 k and the inward weakened portion 17 e, the deformation transmission direction from the hole portion 17 k is normal. It tends to be easily deviated from the direction. Therefore, if the restricting portion 40 is provided at a portion located beside the boundary portion 17n, the restricting portion 40 functions more effectively as a direction restricting portion, and as a result, the seat back frame 1 is smoothly deformed. As a result, smooth absorption of impact energy is achieved.

  In particular, in the present embodiment, the restriction portion 40 has an end located on the hole 17k side among the outer edges (outer edges of the first facing portion 41 and the second facing portion 42) of the edges of the hole portion 17k. It is attached to the seat back frame 1 so as to overlap with the end on the inward weakened portion 17e side. That is, in the left-right direction, the outermost edge of the outer edges of the first facing portion 41 and the second facing portion 42 is the same position as the innermost edge of the edges of the hole portion 17k (FIG. 10). Middle position). If it is such a positional relationship, the above-described effect (an effect of effectively exerting the function as the direction restricting portion) without inhibiting the deformation of the hole portion 17k which is the first fragile portion by the restricting portion 40. Can be obtained. In addition, since the restricting portion 40 is disposed around the edge of the hole portion 17k, it is possible to suppress a decrease in rigidity around the hole portion 17k.

  Further, as described above, the first facing portion 41 and the second facing portion 42 are disposed in the seat back frame 1 at a position sandwiching the inwardly fragile portion 17e in the vertical direction. Then, the inner weak part 17e is attached to the seat back frame 1 with the end part on the hole part 17k side (end part on the outer side in the left-right direction) being sandwiched. More specifically, the first facing portion 41 and the second facing portion 42 are located beside the boundary portion 17n located between the hole portion 17k and the inner weak portion 17e, and the hole portion of the content weak portion 17e. It is attached to the seat back frame 1 with the end on the 17k side sandwiched.

  Thus, if the 1st opposing part 41 and the 2nd opposing part 42 are attached to the position which pinched | interposed the inner weak part 17e, as above-mentioned, both the upper side and lower side of the inner weak part 17e Therefore, the deformation transmission direction from the hole 17k is regulated so as not to deviate from the normal direction. In particular, in this embodiment, if the inner fragile portion 17e is attached to a position sandwiching the end portion on the hole portion 17k side, the functions of the first facing portion 41 and the second facing portion 42 as the direction restricting portion are more enhanced. It comes to be demonstrated effectively. That is, in the inner weakened portion 17e, at the end portion on the hole 17 side, as described above, the transmission direction of deformation of the hole portion 17k is likely to deviate from the normal direction. Therefore, if the part pinched | interposed between the 1st opposing part 41 and the 2nd opposing part 42 among the inner weak parts 17e is an edge part by the side of the hole 17k, the 1st opposing part 41 and the 2nd opposing part The function of the portion 42 as a direction restricting portion is more effectively exhibited, and smoother absorption of impact energy is achieved.

  In addition, the 1st opposing part 41 and the 2nd opposing part 42 are located in the side of the boundary part 17n located between the hole 17k and the inward weak part 17e, and the hole 17k side of the content weak part 17e As a result, the above-described effect is more effectively exhibited, and as a result, the deformation of the hole 17k is easily transmitted to the inwardly fragile portion 17e, so that the seat back frame 1 is smooth. Will be deformed (backward tilted) and smooth absorption of impact energy will be achieved.

  As described above, by providing the seat back frame 1 with the regulating portion 40 as the direction regulating portion, the hole portion as the first fragile portion that deforms as a starting point when an impact load is applied to the seat back frame 1. The deformation of 17k is reliably transmitted to the inner fragile portion 17e as the second fragile portion. As a result, the deformation (backward tilt) of the entire seat back frame 1 proceeds smoothly, so that impact energy can be absorbed smoothly.

  Furthermore, in this embodiment, the hole 17k as a 1st weak part is formed in the connection part 17x which connects the side board 17a and the intermediate | middle board 17b. Here, since the connecting portion 17x has high rigidity with respect to the load along the extending direction (vertical direction), generally, when an impact load of a rear collision is applied, the connecting portion 17x is not easily bent. . By providing the hole 17k in the connecting portion 17x, when an impact load generated at the time of a rear collision or the like is applied, the deformation starts from the hole 17k and the deformation of the hole 17k is started. 2 The seat back frame 1 is deformed (rearly tilted) by being transmitted to the inner weak portion 17e as the weak portion. In such a configuration, by providing the direction restricting portion, it is possible to transmit the deformation from the hole portion 17k to the inwardly fragile portion 17e.

  By the way, in this embodiment, as described above, the restricting portion 40 as the direction restricting portion includes the pair of facing portions 41 and 42 as the constituent elements, and the pair of facing portions 41 and 42 sandwich the inner weak portion 17e. Although it has been attached to the seat back frame 1 in a state, it is not limited to this. Only one of the pair of opposed portions 41 and 42 may be attached. However, the configuration in which the pair of facing portions 41 and 42 are provided with the inner weak portion 17e sandwiched between them is a deformation from the hole portion 17k on both the upper side and the lower side of the inner weak portion 17e. This is desirable in that the transmission direction is regulated so as not to deviate from the normal direction. Note that the restricting portion 40 having only one of the pair of facing portions 41 and 42 is configured so that when the deformation amount (backward tilt amount) of the seat back frame 1 is restricted, the one facing portion is the seat back. It comes into contact with a predetermined part of the frame 1 (for example, the intermediate plate 17b itself) or a member provided on the vehicle main body (a part of the vehicle other than the vehicle seat S).

  In the present embodiment, the hole 17k as the first fragile portion and the inner fragile portion 17e as the second fragile portion are in contact with each other. 11, the hole 17k and the inwardly fragile portion 17e may be arranged with a gap 17s therebetween. In such a configuration, the restricting portion 40 is attached to the upper side or the lower side of the gap 17s, or at a position sandwiching the gap 17s, thereby deviating the transmission direction of deformation of the hole 17k from the normal direction. It becomes possible to regulate so that there is no. However, the configuration in which the hole portion 17k and the inner fragile portion 17e are in contact with each other can more smoothly transmit the deformation from the hole portion 17k to the inner fragile portion 17e. In this respect, the magnetic book embodiment is more desirable. Note that FIG. 11 illustrates a configuration in which the restricting portion 40 (the first facing portion 41 and the second facing portion 42) is attached at a position across the gap 17s.

  Furthermore, in the present embodiment, the outer shapes of the first facing portion 41 and the second facing portion 42 constituting the restricting portion 40 are rectangular when viewed from the front and substantially trapezoidal when viewed from the side. It is not limited to this. As shown in FIG. 12, the outer shape of each of the facing portions 41 and 42 may be circular when viewed from the front. However, as described above, in order to regulate the deformation amount of the seat back frame 1, it is desirable that the regulation surfaces 41a and 42a provided in the facing portions 41 and 42 are flat surfaces. In addition, when the regulating surfaces 41a and 42a are arcuate surfaces as shown in FIG. 12, the contact area when the facing parts come into contact with each other is small, and one facing part (for example, the first facing part 41) is the other. There may be a case where it slides on the regulation surface of the facing portion (for example, the regulation surface 42a of the second facing portion 42) and shifts. In this respect, the present embodiment is preferable.

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

The restricting portion 140 formed integrally with the lower frame base portion 17 is similar to the restricting portion 40 described above. The facing portions facing each other, that is, the first facing portion 141 and the second facing portion having the restricting surfaces 141a and 142a, respectively. 142. The operation and effect of the restricting unit 140 is the same as that of the restricting unit 40. That is, with respect to the restricting portion 140 formed integrally with the lower frame base portion 17, the rigidity of the hole portion 17 k and the inner weak portion 17 e is relatively lowered by increasing the rigidity of the formation position, and the hole portion 17 k and the inner portion By facilitating the deformation of the weakened portion 17e, it is possible to reliably transmit the deformation from the hole portion 17k to the inner weakened portion 17e. The other functions are the same as the functions of the restricting unit 40 described above, and a description thereof will be omitted.
In this way, by forming the restricting portion 140 integrally with the lower frame base portion 17, not only can the number of parts be reduced, but there is no need to perform work such as welding, so the work process can be shortened. it can.

  Furthermore, as another embodiment, as shown in FIG. 14, the restricting portion 240 is formed by integrally forming a first facing portion 241 and a second facing portion 242, and then, on the intermediate plate 17 b of the lower frame base portion 17. It is good also as an attached structure. In the restricting portion 240, the first facing portion 241 and the second facing portion 242 are continuously formed in the vertical direction, and the horizontal portion is located at a position corresponding to (overlapping) the horizontal portion 17f of the inward weakened portion 17e. An opening 240a such as a recess or a hole having substantially the same shape as 17f is formed. Therefore, by forming the opening 240a in the restricting portion 240, when the impact load is applied to the seat back frame 1, the restricting portion 240 does not hinder the deformation of the inner weak portion 17e.

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

  Furthermore, as still another embodiment, as in the restriction portion 340 shown in FIG. 15, the first facing portion 341 and the second facing portion 342 are formed separately and fastening portions 341b and 342b through which fastening means are inserted respectively. It is good also as a structure which formed. The fastening portions 341b and 342b are extended from the portion where the regulation surfaces 341a and 342a are not formed toward the inside and the upper side of the seat, respectively, and are flat so as to follow the intermediate plate 17b of the lower frame base portion 17. Is formed.

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

  Thus, by providing the fastening portions 341b and 342b in the first facing portion 341 and the second facing portion 342, respectively, fastening means such as bolts and nuts can be used when attaching to the intermediate plate 17b of the lower frame base portion 17. The restriction part 340 can be attached by using.

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

  As still another embodiment, like the restriction portion 440 shown in FIG. 16, the first opposing portion 441, the restriction surface 441a provided in the second opposite portion 442, and the restriction surface 442a are formed to have different widths. It may be. In each of the above-described embodiments, the configuration in which the widths in the left and right directions of the first opposing portion and the second opposing portion provided on the upper and lower sides are equal to each other is illustrated. The width in the left-right direction of the restriction surface of the restriction part) may be formed large.

  The width in the left-right direction of the restriction surface 441a of the first facing portion 441 (the length indicated by a in FIG. 16) is the width in the left-right direction of the restriction surface 442a of the second facing portion 442 (the length indicated by b in FIG. 16). It is formed differently. At this time, the width of the regulation surface 442a of the second facing portion 442 disposed below is formed larger. That is, a <b.

  Thus, by forming one of the first facing portion 441 and the second facing portion 442 constituting the restricting portion 440 wider than the other, for example, when an impact load is applied, the seat back frame 1 is twisted. Even in the case of deformation, the first facing portion 441 and the second facing portion 442 are likely to come into contact with each other. That is, by forming one wide, even if the seat back frame 1 is tilted backward so as to be twisted due to a complicated input load, the first facing portion 441 and the second facing portion 442 are provided. Therefore, the deformation amount (backward tilt amount) of the seat back frame 1 can be controlled more easily.

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

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

S vehicle seat, S1 seat back, S2 seating part,
S3 headrest, F seat frame,
1 seat back frame, 2 seating frame,
1a, 2a, 3a cushion pad (pad material),
1b, 2b, 3b skin material, 11 reclining mechanism,
11a Reclining shaft, 15 side frame,
15a side plate (frame side), 15b front edge,
15c Rear edge part (frame extension part), 15d Projection part 15e Convex part, 16 Upper frame,
16a side surface, 17 lower frame base,
17a side plate (frame side), 17b intermediate plate (frame extension),
17c shaft insertion hole, 17d, 17j mounting hole,
17e inner weak part (second weak part, concave part), 17f horizontal part,
17g bent part, 17h inclined part, 17i harness attaching part,
17k hole (first weak part), 17m lateral weak part,
17n boundary part, 17s gap, 17x connecting part,
18 Lower frame erection part (frame extension part),
19 headrest pillar, 19a pillar support,
20 pressure receiving member, 21 wire, 21a shaft support,
22 wires, 30 moving members, 32 shafts,
35 Tension coil spring, 39 Movement prevention part,
40,140,240,340,440 restriction part (direction restriction part),
240a opening,
41, 141, 241, 341, 441 first opposing portion,
41a, 141a, 241a, 341a, 441a regulating surface,
341b fastening portion,
42, 142, 242, 342, 442 second facing portion,
42a, 142a, 242a, 342a, 442a regulating surface,
342b Fastening part

Claims (6)

With a frame that deforms when an impact load is applied,
A first fragile portion that is deformed when the frame is deformed by the impact load;
A second fragile portion that deforms when the deformation of the first fragile portion is transmitted;
A direction regulating portion that regulates the direction in which the deformation of the first fragile portion is transmitted so as not to deviate from the direction from the first fragile portion toward the second fragile portion, and is provided in the frame ,
The first fragile portion is a hole formed in the frame,
The direction restricting portion is a member attached to a position off the horizontal line connecting the first fragile portion and the second fragile portion in the frame, and among the outer edges of the direction restricting portion, the hole The vehicle seat is attached to the frame such that an end located on a portion side overlaps an end on the second fragile portion side among edges of the hole portion . With a frame that deforms when an impact load is applied,
A first fragile portion that is deformed when the frame is deformed by the impact load;
A second fragile portion that deforms when the deformation of the first fragile portion is transmitted;
A direction regulating portion that regulates the direction in which the deformation of the first fragile portion is transmitted so as not to deviate from the direction from the first fragile portion toward the second fragile portion, and is provided in the frame,
The second fragile portion is a recess formed in a groove shape in the frame,
The direction restricting portion is a member attached to a position off a horizontal line connecting the first fragile portion and the second fragile portion in the frame, and a first facing portion and a second facing portion that face each other. Having an opposing part,
The first facing portion and the second facing portion are members attached to the frame in order to contact and regulate the deformation amount when the deformation amount of the frame reaches a predetermined amount, 2 Located at the position of the center line of the weak part,
The distance between the said 1st opposing part and the said 2nd opposing part is shorter than the opening width of the said recessed part, The vehicle seat characterized by the above-mentioned . With a frame that deforms when an impact load is applied,
A first fragile portion that is deformed when the frame is deformed by the impact load;
A second fragile portion that deforms when the deformation of the first fragile portion is transmitted;
A direction regulating portion that regulates the direction in which the deformation of the first fragile portion is transmitted so as not to deviate from the direction from the first fragile portion toward the second fragile portion, and is provided in the frame,
The direction restricting portion is a member attached to a position off the horizontal line connecting the first fragile portion and the second fragile portion in the frame,
The frame is a seat back frame having a frame side portion that is positioned on the left and right sides and extends in the up-down direction, and a frame extension portion that extends from the frame side portion toward the inside in the left-right direction,
The first fragile portion is a hole formed in a connecting portion that connects the frame side portion and the frame extending portion;
The vehicle seat, wherein the second fragile portion is a concave portion that is in contact with the hole and is formed in a groove shape in the frame extending portion . With a frame that deforms when an impact load is applied,
A first fragile portion that is deformed when the frame is deformed by the impact load;
A second fragile portion that deforms when the deformation of the first fragile portion is transmitted;
A direction regulating portion that regulates the direction in which the deformation of the first fragile portion is transmitted so as not to deviate from the direction from the first fragile portion toward the second fragile portion, and is provided in the frame,
The second fragile portion is a recess formed in a groove shape in the frame,
The direction restricting portion is a member attached to a position off a horizontal line connecting the first fragile portion and the second fragile portion in the frame, and a first facing portion and a second facing portion that face each other. Having an opposing part,
The first facing portion and the second facing portion are located at a position sandwiching a center line of the second fragile portion, and in a state of sandwiching an end portion of the concave portion on the first fragile portion side. A vehicle seat mounted on the frame . Both the first fragile portion and the second fragile portion are provided in the frame in a state where both are in contact with each other,
The first opposing portion and the second opposing portion are located beside a boundary portion located between the first fragile portion and the second fragile portion, and the first fragile portion of the second fragile portion. The vehicle seat according to claim 4 , wherein the vehicle seat is attached to the frame with a side end portion interposed therebetween . The first facing portion and the second facing portion are members attached to the frame in order to contact and regulate the deformation amount when the deformation amount of the frame reaches a predetermined amount. The vehicle seat according to claim 4 .

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