JP5956202B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat for a vehicle or the like, and more particularly to a vehicle seat that can absorb an impact force generated at the time of a vehicle rear collision.

  When a rear vehicle collides with another vehicle or the rear part of the host vehicle colliding with the rear part of the host vehicle or the rear part of the host vehicle colliding with another vehicle or a structure, a large impact force is generated on the host vehicle, and the seat of the host vehicle is generated. A large impact force is applied to the occupant seated in the.

  Here, as a conventionally known vehicle seat, Patent Document 1 describes a vehicle seat provided with an oil damper connected to a reclining mechanism, for example, on the right side of a seat back frame.

  In the vehicle seat described in Patent Document 1, the rigidity of the right side of the seat back frame is higher than the rigidity of the left side. Therefore, the impact force generated at the time of the rear collision of the vehicle is caused by the torsional deformation of the seat back frame. It seems to be absorbable.

Japanese Utility Model Publication No. 5-34940

  By the way, although the vehicle seat described in Patent Document 1 described above can absorb the impact due to the torsional deformation of the seat back frame, it is desired that the impact is further absorbed. Accordingly, there is a need for a vehicle seat that can absorb, for example, an impact force generated at the time of a rear collision of the vehicle.

  This invention is made | formed in view of the above technical backgrounds, and makes it a subject to provide the vehicle seat which can absorb further the impact force generated at the time of the vehicle rear surface collision.

  The vehicle seat of the present invention that solves the above-described problem is a vehicle seat that includes at least a seat cushion and a seat back, and the seat back includes a seat back frame with left and right side frames attached thereto, The side frames have different rigidity, and a weak portion is provided at the lower part of the side frame on the higher rigidity side.

  In the vehicle seat according to the present invention, when a rearward movement load is applied from the upper body of the occupant toward the seat back at the time of a rear collision of the vehicle, one of the seat back frames to which the side frame having low rigidity is attached. The seat back frame is twisted around the vertical axis by tilting backward more than the other side of the seat back frame to which a highly rigid side frame is attached. And, by this torsional force, the lower part of the side frame having higher rigidity is deformed from the weak part, so that the impact force generated at the time of rear collision of the vehicle is sufficiently absorbed.

  In the vehicle seat according to the present invention, it is preferable that the fragile portion is configured to induce deformation in a direction from the side frame having the low rigidity toward the side frame having the high rigidity. In this case, the weak part provided in the lower part of the side frame with higher rigidity is easily deformed in the direction from the side frame with lower rigidity toward the side frame with higher rigidity.

  In the vehicle seat of the present invention, when the connecting bracket for connecting the left and right side frames and the seat cushion frame constituting the skeleton of the seat cushion is disposed at the lower part of the left and right side frames, the side having low rigidity One of the connection brackets arranged at the lower portion of the side frame is preferably provided with a first bead that swells on the side opposite to the direction in which the weakened portion deforms. In this case, one of the connecting brackets is easily deformed in a direction in which the weak portion on the side opposite to the side on which the first bead swells is deformed, so when the lower portion of the side frame on the high rigidity side is deformed from the weak portion, The lower part of the side frame on the low rigidity side easily deforms toward the side frame on the high rigidity side.

  Here, the first bead provided on one of the connection brackets disposed at the lower portion of the side frame on the low rigidity side is an outward bead that swells outside the side frame on the high rigidity side. It is preferable that the first bead extends below a mounting portion for attaching one of the connection brackets to a lower portion of the side frame on the low rigidity side. In this case, the attachment portion for attaching one of the connection brackets to the lower portion of the side frame on the low rigidity side is stiffened by the first bead.

  Further, the first bead provided on one of the connecting brackets is divided into upper and lower parts, and a deformation guide part that induces deformation toward the side frame on the higher rigidity side is provided between the divided upper and lower beads. Preferably it is provided. In this case, one of the connecting brackets can be easily deformed from the deformation guide part between the upper and lower beads toward the side frame on the higher rigidity side, so that the lower part of the side frame on the higher rigidity side is the fragile part. When deforming, the lower part of the side frame on the low rigidity side is more easily deformed toward the side frame on the high rigidity side.

  Further, it is preferable that one of the connection brackets is provided with a front and rear bead extending in a direction intersecting with the first bead divided vertically as the second bead. In this case, one of the connecting brackets is bent inward along the second bead so that it can be easily deformed. Therefore, when the lower part of the side frame on the higher rigidity side is deformed from the weak part, the lower rigidity side The lower part of the side frame is more easily deformed toward the side frame having higher rigidity.

  In the vehicle seat according to the present invention, the side frame on the side having high rigidity has a rear edge extending along the lateral outer surface of the seat back frame, and a lower portion of the rear edge extends around the rear surface of the seat back frame. It is preferable that it is fixed. In this case, the side frame on the higher rigidity side is easily twisted and deformed, so that the seat back frame is more easily twisted at the time of a rear collision of the vehicle. As a result, the lower part of the side frame on the higher rigidity side is deformed from the fragile part, and the impact force due to the rear collision of the vehicle is absorbed.

According to the present invention, when a rearward movement load is applied from the upper body of the occupant to the seat back at the time of a rear collision of the vehicle, one side of the seat back frame to which the side frame having low rigidity is attached is a side frame having high rigidity. The seat back frame is twisted around the vertical axis by tilting backward from the other side of the seat back frame to which is attached. And, by this twisting force, the lower part of the side frame on the side with high rigidity is easily deformed from the weak part. As a result, it becomes easy to absorb the impact force generated at the time of rear collision of the vehicle.

According to the present invention, the fragile portion provided at the lower part of the side frame on the higher rigidity side is configured to induce deformation in a direction from the side frame on the lower rigidity side to the side frame on the higher rigidity side. Therefore, at the time of rear collision of the vehicle, the weak part can be deformed in the direction from the side frame with low rigidity to the side frame with high rigidity, and the lower part of the side frame with high rigidity can be moved from the weak part. It can be easily deformed.

According to the present invention, since the first bead that swells on the opposite side to the direction in which the fragile portion is deformed is provided on one of the connecting brackets disposed on the lower portion of the side frame on the low rigidity side, the rigidity is increased. When the lower part of the higher side frame is deformed from the weak part, it is possible to prevent one of the connecting brackets arranged at the lower part of the lower side frame from deforming in the direction opposite to the deformation direction of the weak part. it can. As a result, the lower part of the side frame on the higher rigidity side can be more easily deformed from the weak part.

According to the present invention, the first bead provided on one of the connection brackets disposed at the lower portion of the side frame on the low rigidity side is an outward bead that swells outside the side frame on the opposite side of the high rigidity side frame. Since the first bead extends below the attachment portion for attaching one of the connection brackets to the lower part of the side frame on the low rigidity side, one of the connection brackets is provided on the lower part of the side frame on the low rigidity side. Can be stiffened by the first bead. In addition, it can suppress that one connection bracket deform | transforms in the opposite direction to the deformation | transformation direction of a weak part.

According to the present invention, the first bead provided on one of the connecting brackets is divided into upper and lower parts, and deformation that induces deformation toward the side frame on the higher rigidity side between the divided upper and lower beads. Since the guide portion is provided, one of the connecting brackets can be easily deformed from the deformation guide portion between the upper and lower beads toward the side frame on the higher rigidity side of the side frame on the higher rigidity side. When the lower portion is deformed from the fragile portion, the lower portion of the side frame having the lower rigidity can be more easily deformed toward the side frame having the higher rigidity. As a result, the lower part of the side frame on the higher rigidity side can be more easily deformed from the fragile part.

According to the present invention, the front and rear beads extending in the direction intersecting with the first bead divided vertically are provided as the second bead on one of the connection brackets. It can be easily deformed by bending inward along the bead, and when the lower part of the side frame with higher rigidity is deformed from the weak part, the lower part of the side frame with lower rigidity is changed to the side frame with higher rigidity. It is possible to make it easier to deform toward. As a result, the lower part of the side frame on the higher rigidity side can be more easily deformed from the fragile part.

According to the present invention, the rear edge portion of the side frame on the higher rigidity side extends along the lateral outer surface of the seat back frame, and the lower portion of the rear edge portion is fixed to the rear surface of the seat back frame. Therefore, the side frame on the higher rigidity side is easily twisted and deformed, and the seat back frame is more easily twisted at the time of rear collision of the vehicle. Therefore, the lower part of the side frame on the higher rigidity side can be deformed from the fragile part, and the impact force generated at the time of the rear collision of the vehicle can be absorbed.

1 is a perspective view of a vehicle seat showing an embodiment of a vehicle seat according to the present invention. FIG. 2 is a front perspective view of a seat cushion frame and a seat back frame built in the vehicle seat shown in FIG. 1. FIG. 3 is a rear perspective view of the seat cushion frame and the seat back frame shown in FIG. 2. FIG. 3 is an enlarged perspective view of the vicinity of the induction coupling portion illustrated in FIG. 2. FIG. 3 is an enlarged perspective view near a support bracket shown in FIG. 2. FIG. 4 is a partial perspective view showing an inner surface side of the right connecting bracket shown in FIGS. 2 and 3. It is a fragmentary perspective view which shows the outer surface side of the right side connection bracket shown in FIG. It is a perspective view which shows the structural member of the slide rail shown in FIG. It is a partial side view which shows the inner surface side of the right side connection bracket shown in FIG. FIG. 4 is a partial enlarged perspective view of the outer surface side of the connection bracket showing a modified example of the bead of the left connection bracket shown in FIGS. 2 and 3. It is the elements on larger scale corresponding to FIG. 10 which shows the other modification of the bead shown in FIG. It is a perspective view showing the behavior of the seat back frame at the time of a rear collision of the vehicle seat of one embodiment. FIG. 6 is a partial rear view showing the behavior of the right connection bracket and the slide rail at the time of a rear collision of the vehicle seat according to the embodiment. FIG. 4 is a partial rear view showing the behavior of the left connecting bracket and the slide rail at the time of a rear collision of the vehicle seat according to the embodiment, (a) showing the left connecting bracket shown in FIG. 2 and (b). The left connection bracket shown in FIG. It is a perspective view which shows the modification of the slide rail and right side connection bracket which were shown in FIG.

  Hereinafter, an embodiment of a vehicle seat according to the present invention will be described with reference to the accompanying drawings. For example, as shown in FIG. 1, the vehicle seat according to the embodiment is configured as a vehicle seat S disposed in a driver's seat of an automobile. The vehicle seat S includes a seat cushion S1, a seat back S2, and a headrest S3 in which a pad material made of a cushion material such as urethane foam is covered with an outer skin such as synthetic leather or fabric. In the following description, the front-rear and left-right directions are directions viewed from the occupant assuming a state in which the occupant is seated on the seat cushion S1.

  The seat cushion S1 and the seat back S2 incorporate a seat cushion frame 10 and a seat back frame 20 as shown in FIGS. 2 and 3 as a skeleton. Although not shown, the headrest S3 also incorporates a headrest frame that constitutes the skeleton thereof.

  The seat cushion frame 10 is mainly composed of a bread frame 11 press-molded into a substantially rectangular dish shape. The pan frame 11 can be adjusted in position in the front-rear direction via a slide rail 30 on the floor of the driver's seat.

  On the other hand, the seat back frame 20 is welded to a pipe frame 21 framed in a vertically long rectangle, a right side frame 22 welded (fixed) to the right side portion of the pipe frame 21, and a lower portion of the left side portion of the pipe frame 21. The left side frame 23 is provided, and a support bracket 24 that is disposed immediately above the left side frame 23 and welded to the left side portion of the pipe frame 21 is provided.

  The right side frame 22 is press-molded into a shape projecting forward from the right side portion of the pipe frame 21. The right side frame 22 is welded along the outer surface of the right portion of the pipe frame 21 at the rear edge, and the lower portion of the rear edge goes around the rear surface of the pipe frame 21 and is firmly welded. The rigidity of the right side portion of the frame 21 is increased.

  The lower end portion of the right side frame 22 is connected to a right connection bracket 40 disposed at the right rear portion of the seat cushion frame 10 via a reclining unit RU so as to be tiltable back and forth. Here, the right connection bracket 40 constitutes another connection bracket disposed at the lower portion of the right side frame 22 which is a side frame having a high rigidity.

  The left side frame 23 is welded so as to hold the outer surface of the lower end portion on the left side of the pipe frame 21. The lower end portion of the left side frame 23 is connected to the left connecting bracket 50 disposed at the left rear portion of the seat cushion frame 10 so as to be tiltable forward and backward. Here, the left connecting bracket 50 constitutes one connecting bracket disposed at a lower portion of the left side frame 23 which is a side frame having a low rigidity.

  The support bracket 24 also serves as a support member for an armrest (not shown), and includes support pins 24A for supporting the armrest so that the armrest can be tilted up and down.

  Between the right side frame 22 and the support bracket 24, as an example of an elastic support member, an upper elastic support member 25 and a lower elastic support member 26 made of linear springs bent in a continuous waveform are stretched. Yes. When a pressure receiving plate (not shown) that receives the upper body of the occupant seated on the seat cushion S1 is provided, the pressure receiving plate is attached to the upper elastic support member 25 and the lower elastic support member 26 so that the front and rear direction of the seat Elastically supported. The elastic support member that supports such a pressure receiving plate can be constituted by a wire spring.

  Here, the right side frame 22 having high rigidity includes guide connection portions 22A and 22A for connecting the right end portions of the upper elastic support member 25 and the lower elastic support member 26 so as to be capable of being guided rearward, respectively. Is formed by cutting and raising the plate material.

  Since the upper and lower guide connecting portions 22A and 22A are configured in the same manner, only the upper guide connecting portion 22A for connecting the right end portion of the upper elastic support member 25 so as to be able to be guided rearward will be described, and the lower elastic support member 26 is described. The description of the lower guide connecting portion 22A that connects the right end portion of the rear end of the right end portion so as to be capable of being guided rearward is omitted.

  As shown in an enlarged view in FIG. 4, the induction coupling portion 22 </ b> A is obliquely cut and raised in a tongue shape so that the front end portion protrudes inward from the left side surface (inner side surface) of the right side frame 22. A hook portion 22B that locks the right end portion of the upper elastic support member 25 is bent and formed in an L shape in the outer direction at the front end portion of the induction coupling portion 22A.

  Further, a reinforcing portion 22C is formed to bulge inward in the rear end portion of the induction coupling portion 22A. The reinforcing part 22C reinforces the back side of the rear part of a sliding guide part 22D described later. Since the rear end portion of the sliding guide portion 22D has an escape portion (inner convex portion) 22H for easily separating the right end portion of the upper elastic support member 25 forward, the right end portion of the upper elastic support member 25 is provided. Since the resistance at the rear end of the sliding guide portion 22D is suppressed, it becomes easier to return to the front.

  The outer surface of the induction coupling portion 22A is set as a sliding guide portion 22D for sliding the right end portion of the upper elastic support member 25 rearward. The sliding guide portion 22D is inclined obliquely in the contraction direction of the upper elastic support member 25 from the rear portion toward the front portion. That is, the sliding guide portion 22D is inclined obliquely in the inner direction away from the left side surface of the right side frame 22, and the front side is located on the inner side from the rear side.

  And the sliding control part (front sliding control part) 22E which controls the sliding to the front is set in the part bent outside the front part of sliding guide part 22D. The sliding restricting portion 22E restricts the right end portion of the upper elastic support member 25 from sliding backward until the backward moving load acting on the upper elastic support member 25 reaches a predetermined value.

  In addition, a position restricting portion 22F that functions as a stopper that stops the right end portion of the upper elastic support member 25 sliding rearward at a predetermined end position is provided at the rear end portion of the sliding guide portion 22D. The position restricting portion 22F is made of a resin material or a rubber material having a silencing effect, for example, in the shape of a rod having a triangular cross section, and is fixed to the rear end portion of the sliding guide portion 22D by bonding or the like.

  Here, an upwardly projecting escape portion (an angled shape) 22G is formed at the upper part of the cut-and-raised window of the right side frame 22 from which the guide connecting portion 22A has been cut and raised. The escape portion 22G avoids interference with the right end portion of the upper elastic support member 25 when the right end portion of the upper elastic support member 25 made of a linear spring is hooked to the hook portion 22B of the guide connection portion 22A. It is for improving. In addition, since such a chevron-shaped escape portion 22G is not essential, the escape portion 22G can be omitted as shown by a two-dot chain line in FIG.

  On the other hand, as shown in an enlarged view in FIG. 5, the support bracket 24 has fixing portions (holding portions) 24 </ b> B and 24 </ b> B for holding and fixing the left end portions of the upper elastic support member 25 and the lower elastic support member 26, respectively. It is bent and formed. The fixing portions (holding portions) 24B and 24B are distributed in the vertical direction, and the support pin 24A and the mounting portion are provided therebetween, so that the arrangement is compact.

  Since the left and right slide rails 30 and 30 shown in FIG. 3 are basically symmetrical, only the right slide rail 30 will be described, and a detailed description of the left slide rail 30 will be omitted. Here, as shown in FIGS. 6 and 7, the right slide rail 30 includes a lower rail 31 fixed on the floor of the driver's seat, and an upper rail that is slidably assembled to the lower rail 31 in the front-rear direction. 32 and a slide member 33 fixed on the upper rail 32. The slide member 33 may be configured integrally with the upper rail 32.

  The right slide member 33 is a seat attachment member that constitutes a part of the seat cushion frame 10 shown in FIGS. 2 and 3, and is connected to the right connection bracket 40. As shown in FIG. 8, the slide member 33 includes a front connection piece 33A and a rear connection piece 33B connected to the pan frame 11, a side wall 33C connected to the right connection bracket 40, the right connection bracket 40, and the like. And a rear wall 33D for fixing a cover member (not shown).

  The rear wall 33 </ b> D is a first wall that rises upward from the rear portion of the slide member 33, and the side wall 33 </ b> C is a second wall that overlaps the inner surface of the right connection bracket 40 and rises upward. The side wall 33C (second wall) is formed higher than the rear wall 33D (first wall) in order to enlarge the joint surface with the right connection bracket 40, and both intersect each other at a right angle. Yes.

  Here, a fragile portion 33E for inducing deformation due to an impact load in the left-right direction is provided at the rear portion of the right slide member 33 constituting the right slide rail 30. The fragile portion 33E is formed as a notch portion that opens upward between the rear wall 33D (first wall) and the side wall 33C (second wall).

  As shown in FIG. 7, the weakened portion 33E formed at the rear portion of the right slide member 33 serves as a fixing portion that fixes the side wall 33C (second wall) of the slide member 33 and the lower portion of the right connection bracket 40. Of the front and rear bolts and nuts BN, the bolts and nuts BN arranged at the rear of the right connecting bracket 40 are cut out to a position below the position.

  The reclining unit RU is disposed between the lower end portion of the right side frame 22 and the upper portion of the right connection bracket 40, and the upper portion of the right connection bracket 40 is connected to the lower portion of the right side frame 22 through the reclining unit RU. Has been. Thereby, the right slide member 33 is connected to the lower end portion of the right side frame 22 via the right connection bracket 40 and the reclining unit RU. The left slide member 33 is connected to the lower end portion of the left side frame 23 via the left connection bracket 50 (see FIG. 5).

  Here, the weak part is provided in the lower part of the right side frame 22 by the side with high rigidity. That is, a weak portion for inducing deformation by a torsional force around the vertical axis of the seat back frame 20 at the rear portion of the right connecting bracket 40 located at the lower portion of the right side frame 22 on the higher rigidity side. 41 is provided. As shown in FIG. 9, the fragile portion 41 is formed as a step portion located on the rear side of the reclining unit RU on the radially outer side of the reclining unit RU, and is rigid from the left side frame 23 on the low rigidity side. It is configured to induce deformation in a direction toward the right side frame 22 on the higher side.

  The right connecting bracket 40 includes front and rear beads for stiffening that bulge outward on the opposite side of the left connecting bracket 50, that is, a front vertical bead 42 and a rear vertical bead 43. As shown in FIG. 9, the front vertical bead 42 is formed at a position where the upper end faces the outer periphery of the front side of the reclining unit RU, and the lower half of the front vertical bead 42 overlaps the side wall 33 </ b> C of the slide member 33. Is arranged.

  On the other hand, the rear vertical bead 43 is formed at a position where the upper end faces directly below the fragile portion 41 around the rear outer periphery of the reclining unit RU, and its lower half overlaps the side wall 33C of the slide member 33. Placed in position. That is, the upper end portion of the rear vertical bead 43 and the fragile portion 41 are arranged on a common circumference centering on the central axis of the reclining unit RU. In other words, the line extending upward of the rear vertical bead 43 and the stepped portion of the fragile portion 41 intersect on a common circumference centering on the central axis of the reclining unit RU.

  Here, as shown in FIG. 5, the left connecting bracket 50 has a stiffening vertical bead 51 that bulges outward on the opposite side of the right connecting bracket 40 as a first outward bead. The vertical bead 51 as the first outward bead is formed so as to extend downward from a position in the vicinity of the pivoting portion 52 at the upper portion of the left connecting bracket 50 that is rotatably connected to the lower end portion of the left side frame 23. Has been. For this reason, the pivoting portion 52 of the left connecting bracket 50 is stiffened by the vertical bead 51.

  Note that the vertical bead 51, which is the first outward bead, can be formed by dividing it vertically as shown in FIG. In this case, the left connecting bracket 50 can be easily deformed inward from the portion where the vertical bead 51 is divided vertically.

  In addition, as shown in FIG. 11, in a divided portion of the vertical bead 51 formed by dividing the upper and lower parts, a horizontal bead 53 that extends in the same direction as the vertical bead 51 and intersects with the vertical bead 51 extends to the second. It can be formed as an outward facing bead. In this case, the left connecting bracket 50 can be easily deformed by bending inward along the lateral bead 53 that is the second outward bead. In addition, it is preferable to provide a through hole in the lateral bead 53 that is the second outward-facing bead because the left connecting bracket 50 is more easily bent along the lateral bead 53.

  Then, the effect is demonstrated about the vehicle seat S comprised as one Embodiment of the vehicle seat which concerns on this invention. During driving of the host vehicle in which the vehicle seat S shown in FIG. 1 is disposed in the driver's seat, normal driving in which the pressing force acting on the seat back S2 from the upper body of the passenger seated on the seat cushion S1 is within a predetermined range. At times, the right end portions of the upper elastic support member 25 and the lower elastic support member 26 shown in FIGS. 2 and 3 are locked to the sliding restriction portion 22E at the front portion of the sliding guide portion 22D shown in FIG. Is in a state. For this reason, the upper body of the occupant sinks into the seat back S2 appropriately while pressing the upper elastic support member 25 and the lower elastic support member 26, and thus the upper body of the occupant is held in a stable driving posture. .

  Here, when another vehicle collides with the rear part of the own vehicle or the rear part of the own vehicle that collides with the other vehicle or a structure collides with the rear surface of the own vehicle, the upper part of the occupant faces the seat back S2. Since the rearward movement load is applied impactively, the upper elastic support member 25 and the lower elastic support member 26 are greatly bent backward. At that time, the right end portions of the upper elastic support member 25 and the lower elastic support member 26 slide on the slide guide portion 22D from the front slide restricting portion 22E to the rear of the slide guide portion 22D to control the position. It stops at a predetermined end position quietly without being caught by the part and generating abnormal noise. As a result, the upper body of the occupant sinks deeply into the seat back S2, the occupant's head is quickly received by the headrest S3, and the load on the occupant's neck is greatly reduced.

  In addition, at the time of such a rear-end collision of the host vehicle, a pipe with a side frame 23 having low rigidity attached thereto as shown in FIG. 12 due to a shocking backward movement load applied to the seat back S2 (see FIG. 1). The left side of the frame 21 is greatly rearward inclined from the right side of the pipe frame 21 to which the highly rigid side frame 22 is attached, and the seat back frame 20 is twisted counterclockwise around the vertical axis. Then, due to this twisting force, as shown in FIG. 13, the right connecting bracket 40 disposed at the lower portion of the side frame 22 on the higher rigidity side is deformed outward in the right direction starting from the fragile portion 41.

  At that time, the left connecting bracket 50 arranged at the lower portion of the side frame 23 on the low rigidity side falls down toward the right connecting bracket 40 together with the side wall 33C of the slide member 33 as shown in FIG. The right connecting bracket 40 helps to deform outward in the right direction starting from the weakened portion 41. As a result, the impact force generated at the time of the rear collision of the host vehicle is sufficiently absorbed.

  Here, since the fragile portion 41 of the right connection bracket 40 is formed as a stepped portion located around the outer periphery of the rear portion of the reclining unit RU having a high rigidity, the fragile portion 41 having a low rigidity at the time of a rear collision of the host vehicle. The right connection bracket 40 is deformed from the starting point. As a result, the impact force generated at the time of a rear collision of the host vehicle is absorbed. Further, since the right connection bracket 40 is deformed to the right in the outer side, the headrest S3 can maintain a state where the head of the occupant is received, and a load on the occupant's neck is reduced.

  Further, a rear vertical bead 43 is provided at the rear portion of the right connection bracket 40, and the extension line of the rear vertical bead 43 and the stepped portion of the fragile portion 41 are centered on the central axis of the reclining unit RU. Since they intersect on a common circumference, the rigidity of the fragile portion 41 can be easily reduced with a simple structure, and the rear portion of the right connecting bracket 40 can be easily deformed from the fragile portion 41. .

  Further, the right connection bracket 40 is fixed to the side wall 33C of the slide member 33 so as to be overlapped, and the rear vertical bead 43 is provided below the fragile portion 41 so as to overlap the side wall 33C of the slide member 33. As shown in FIG. 13, the connecting bracket 40 starts to deform at a low-rigidity portion (see line L in FIG. 9) between the reclining unit RU and the rear vertical bead 43 starting from the fragile portion 41.

  Further, since the front vertical bead 42 and the rear vertical bead 43 of the right connection bracket 40 are provided so as to bulge outward in the right direction of the vehicle seat S, the lower portion of the right connection bracket 40 is disposed on the side wall of the slide member 33. The right connecting bracket 40 can be deformed from the weakened portion 41 on the upper side.

  On the other hand, since the vertical bead 51 provided on the left connecting bracket 50 swells outward on the opposite side to the right connecting bracket 40, the left connecting bracket 50 is deformed to the inner side opposite to the outer side where the vertical bead 51 swells. This is easy (see FIG. 14A). That is, the left connecting bracket 50 is easily deformed toward the right connecting bracket 40. For this reason, when the right connecting bracket 40 is deformed from the fragile portion 41, the left connecting bracket 50 is easily deformed toward the right connecting bracket 40, thereby assisting the right connecting bracket 40 to be deformed from the fragile portion 41. To do. Therefore, the right connection bracket 40 is easily deformed from the fragile portion 41, and the impact force generated at the time of the rear collision of the host vehicle is easily absorbed.

  Further, since the vertical bead 51 provided on the left connection bracket 50 is formed in a form extending downward from a position in the vicinity of the upper joint portion 52 of the left connection bracket 50, the pivot portion 52 of the left connection bracket 50 is formed. It is stiffened by the vertical bead 51.

  Here, as shown in FIG. 10, when the vertical bead 51 provided on the left connecting bracket 50 is divided into upper and lower parts, the left connecting bracket 50 is, as shown in FIG. The vertical bead 51 can be easily deformed inward from the vertically divided portion. Accordingly, in this case, the right connection bracket 40 is more easily deformed from the fragile portion 41, and the impact force generated at the time of a rear collision of the host vehicle is more easily absorbed.

  Further, a vertical bead 51 provided on the left connection bracket 50 is divided into upper and lower parts, and a horizontal bead 53 extending across the vertical bead 51 is formed at the divided part so as to swell in the same direction as the vertical bead 51. The left connection bracket 50 can be easily deformed inward from the lateral bead 53. Therefore, in this case, the right connection bracket 40 is more easily deformed from the fragile portion 41, and the impact force generated at the time of a rear collision of the host vehicle is more easily absorbed.

  Here, the right side frame 22 having high rigidity is provided with induction connecting portions 22A and 22A for connecting the right end portions of the upper elastic support member 25 and the lower elastic support member 26 so as to be able to be guided rearward. The upper body of the occupant sinking into the seat back S2 at the time of a rear collision of the host vehicle comes to sink deeply toward the right side frame 22 having high rigidity, and the rigidity is high by adding this rearward movement load. The right connection bracket 40 disposed at the lower portion of the side frame 22 on the side is more easily deformed from the fragile portion 41. Therefore, the impact force generated at the time of the rear collision of the host vehicle is absorbed even more easily.

  Further, the right side frame 22 on the higher rigidity side has a rear edge extending along an outer side surface in the left-right direction of the seat back frame 20, and a lower portion of the rear edge goes around the rear surface of the seat back frame 20. Since it is fixed, the side frame 22 on the higher rigidity side is easily twisted and deformed. For this reason, at the time of a rear collision of the vehicle, the seat back frame 20 is more easily twisted. As a result, the right connection bracket 40 disposed at the lower portion of the side frame 22 on the higher rigidity side can be more easily separated from the fragile portion 41. Deformed. Therefore, the impact force generated at the time of the rear collision of the host vehicle is absorbed even more easily.

  Here, in the vehicle seat according to the embodiment, a fragile portion 33 </ b> E with respect to a load in the left-right direction is provided at the rear portion of the slide member 33 constituting the slide rail 30. In other words, the fragile portion 33E is formed between the rear wall 33D and the side wall 33C that stand up crossing each other at the rear end portion of the slide member 33 so that the slide member 33 can be easily deformed from the fragile portion 33E while ensuring rigidity. In the middle, it is formed as a notch that opens upward.

  Therefore, when the right connecting bracket 40 is deformed outward in the right direction starting from the fragile portion 41 at the time of a rear collision of the host vehicle, the side wall 33C of the slide member 33 falls together with the right connecting bracket 40 to the right outward and the right connecting bracket. 40 helps to deform from the fragile portion 41. As a result, the impact force generated at the time of the rear collision of the host vehicle is more sufficiently absorbed. In addition, since the side wall 33C of the slide member 33 falls to the outside in the right direction together with the right connection bracket 40, the headrest S3 can maintain a state where the head of the occupant is received and the load on the occupant's neck is reduced. Is done.

  Here, since the fixing portion that connects the side wall 33C of the slide member 33 and the right connection bracket 40 is configured by the front and rear bolts and nuts BN, the right connection bracket 40 is easily deformed from the fragile portion 41. Of the front and rear bolts and nuts BN serving as the fixing parts, the rear bolts and nuts BN are arranged at the rear part of the side wall 33C of the slide member 33, and are located close to the weak part 41 of the right connection bracket 40. Therefore, the impact load is easily transmitted from the rear bolt / nut BN to the fragile portion 41, and the right connection bracket 40 is easily deformed from the fragile portion 41.

  Further, as shown in FIG. 7, the weakened portion 33E formed at the rear portion of the slide member 33 has front and rear bolts and nuts as fixing portions for fixing the side wall 33C of the slide member 33 and the lower portion of the right connection bracket 40. The BN is formed by cutting out to a position below the position of the bolt and nut BN arranged at the rear portion of the right connecting bracket 40. For this reason, the right connection bracket 40 is easily deformed from the fragile portion 33 </ b> E together with the side wall 33 </ b> C of the slide member 33.

  According to the vehicle seat S of the embodiment, the vehicle has the guide connecting portion 22A for connecting the right end portions of the upper elastic support member 25 and the lower elastic support member 26 to the seat back frame 20 so as to be able to be guided rearward. When a rearward movement load is applied from the upper body of the occupant toward the seat back S2 at the time of a rear-end collision, the upper body of the occupant is submerged deeply into the seat back S2 so that the head of the occupant approaches the headrest S3. It is possible to effectively protect the head and neck of the occupant.

  Further, when a shocking backward movement load acts on the seat back S2 from the upper body of the occupant during a rear collision of the host vehicle, the rigidity of the left side of the pipe frame 21 to which the side frame 23 with low rigidity is attached is The seat back frame 20 can be twisted counterclockwise around the vertical axis by tilting backward from the right side of the pipe frame 21 to which the high side frame 22 is attached. Since the right connecting bracket 40 disposed at the lower part of the side frame 22 can be deformed from the fragile portion 41 to the outside in the right direction, it is possible to sufficiently absorb the impact force generated at the rear collision of the host vehicle.

  Further, the weakened portion 41 of the right connection bracket 40 is formed as a step portion that is adjacent to the reclining unit RU having high rigidity and is located on the radially outer side of the reclining unit RU. The right connection bracket 40 can be deformed starting from the low fragile portion 41. As a result, it is possible to absorb the impact force generated at the time of the rear collision of the host vehicle. Further, since the right connection bracket 40 is deformed in the right outer direction, the headrest S3 can maintain a state where the head of the occupant is received, and the load on the occupant's neck can be reduced.

  Further, since the weak portion 33E against the load in the left-right direction is provided at the rear portion of the slide member 33 constituting the slide rail 30, the right connecting bracket 40 starts from the weak portion 41 in the right direction at the time of a rear collision of the host vehicle. When deforming outward, the side wall 33 </ b> C of the slide member 33 collapses together with the right connection bracket 40 to the outside in the right direction to help the right connection bracket 40 deform from the fragile portion 41. Therefore, the impact force generated at the time of the rear collision of the host vehicle can be absorbed more sufficiently. In addition, since the side wall 33C of the slide member 33 falls to the outside in the right direction together with the right connection bracket 40, the headrest S3 can maintain the state of receiving the head of the occupant and reduce the load on the occupant's neck. can do.

  The vehicle seat S as one embodiment of the vehicle seat according to the present invention has been described above, but the vehicle seat according to the present invention is not limited to the vehicle seat S according to the embodiment, and the structure thereof. Can be appropriately changed.

  For example, a plurality of stiffening beads formed on the right connection bracket 40 can be provided so as to sandwich the fragile portion 41. In this case, since stress concentrates on the fragile portion 41 sandwiched between the stiffening beads, the right connection bracket 40 is deformed from the fragile portion 41 and absorbs an impact force generated at the time of a rear collision of the host vehicle. be able to.

  Moreover, although the weak part 33E of the slide rail 30 shown in FIG. 7 was made into the form which notched between the rear wall 33D of the slide member 33 and the side wall 33C to the lower end, as shown in FIG. It is good also as the weak part 33F of the form which connected the lower part of the rear wall 33D and the side wall 33C by notching between the side wall 33C from the upper part.

  Furthermore, a long hole (slit) extending in the front-rear direction may be formed in the lower portion of the rear end portion of the side wall 33C, and the long hole (slit) may be used as the fragile portion 33G. Here, the rear bolt / nut BN for fixing the rear portion of the side wall 33C (second wall) and the rear portion of the right connection bracket 40 so that the weak portion 33F or the weak portion 33G can be easily deformed is provided on the rear wall. It is preferable to arrange at a position higher than the upper end of 33D (first wall).

  The vehicle seat S according to the embodiment is configured for a vehicle in which the driver's seat is arranged on the right side. However, the vehicle seat S is arranged on the left side by reversing the structure in the left-right direction. Applicable.

  Further, the vehicle seat S according to the embodiment may be configured as a bucket type vehicle seat in which a seat cushion S1, a seat back S2, and a headrest S3 are integrally configured.

  Furthermore, the vehicle seat of the present invention can be configured as a boat or aircraft seat.

DESCRIPTION OF SYMBOLS 10 Seat cushion frame 11 Pan frame 20 Seat back frame 22 Right side frame 22A Guidance connection part 22B Hook part 22C Reinforcement part 22D Sliding guide part 22E Sliding regulation part 22F Position regulation part 23 Left side frame 24 Support bracket 25 Upper elastic support Member 26 Lower elastic support member 27 Guide connecting portion 27B Sliding guide portion 27C Sliding restricting portion 27D Sliding guide portion 27E Sliding guide portion 27F Position restricting portion 30 Slide rail 31 Lower rail 32 Upper rail 33 Slide member 33A Front connecting piece 33B Rear connection piece 33C Side wall 33D Rear wall 33E Weak part 40 Right connection bracket 41 Weak part 42 Front vertical bead 43 Rear vertical bead 50 Left connection bracket 51 Vertical bead 52 Pivoting part 53 Horizontal bead BN Bolt / Nut RU reclining unit S vehicle seat S1 seat cushion S2 seat back S3 headrest

Claims (8)

A vehicle seat having at least a seat cushion and a seat back,
The seat back has a seat back frame provided with left and right side frames, and the left and right side frames have different rigidity,
The lower part of the side frame on the higher rigidity side is provided with a weak part configured to induce deformation in a direction from the side frame on the lower rigidity side to the side frame on the higher rigidity side. Vehicle seat to be used. At the lower part of the left and right side frames, a connection bracket for connecting the left and right side frames and the seat cushion frame constituting the skeleton of the seat cushion is disposed,
One coupling bracket rigidity is disposed below the lower side of the side frame, in claim 1, wherein the first bead bulging to the opposite side is provided with a direction in which the fragile portion is deformed The vehicle seat described. A vehicle seat having at least a seat cushion and a seat back,
The seat back has a seat back frame provided with left and right side frames, and the left and right side frames have different rigidity,
Rigidity fragile portion is provided we are at the bottom of the higher side of the side frame,
At the lower part of the left and right side frames, a connection bracket for connecting the left and right side frames and the seat cushion frame constituting the skeleton of the seat cushion is disposed,
One of the connection brackets arranged at the lower part of the side frame on the low-rigidity side is provided with a first bead that swells on the opposite side to the direction in which the weakened portion is deformed . The first bead is an outward-facing bead that swells to the outer side opposite to the high-rigidity side frame, and the first bead is located on the lower side of the low-rigidity side frame. The vehicle seat according to claim 2 , wherein the vehicle seat extends below a mounting portion to which the connection bracket is attached.   The first bead is divided into upper and lower beads, and a deformation guide portion for inducing deformation toward the side frame on the higher rigidity side is provided between the divided upper and lower beads. The vehicle seat according to claim 3 or 4.   The vehicle seat according to claim 5, wherein front and rear beads extending in a direction intersecting with the first bead are provided as second beads. A vehicle seat having at least a seat cushion and a seat back,
The seat back has a seat back frame provided with left and right side frames, and the left and right side frames have different rigidity,
At the lower part of the left and right side frames, a connection bracket for connecting the left and right side frames and the seat cushion frame constituting the skeleton of the seat cushion is disposed,
The vehicle seat according to claim 1 , wherein a weak portion is provided in the connection bracket at a lower portion of the side frame on the side having high rigidity. The side frame on the high-rigidity side has a rear edge extending along the lateral outer surface of the seat back frame,
The vehicle seat according to any one of claims 1 to 7 , wherein a lower portion of the rear edge portion goes around a rear surface of the seat back frame and is fixed to the rear surface.

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