WO2013133245A1

WO2013133245A1 - Vehicle seat

Info

Publication number: WO2013133245A1
Application number: PCT/JP2013/055916
Authority: WO
Inventors: 宮崎眞幸
Original assignee: テイ・エステック株式会社
Priority date: 2012-03-06
Filing date: 2013-03-05
Publication date: 2013-09-12

Abstract

When an impact load which occurs in a vehicular rear-end collision acts laterally from a side frame on a linking bracket (40), the impact load is promptly transmitted from an anchoring part which is positioned in the rear part of a sliding member to a fragile part (33E) which is located near thereto, thus promptly and easily deforming a lateral wall (33C) of the sliding member with the fragile part (33E) as the origin thereof.

Description

Vehicle seat

The present invention relates to a vehicle seat for vehicles and the like, and more particularly to a vehicle seat that can absorb an impact force generated when a vehicle collides.

In the event of a collision such as a side collision or a rear collision of the vehicle, a large impact force is generated in the vehicle, and a large impact force is applied to the passenger sitting on the vehicle seat.

Here, as a vehicle seat capable of absorbing a shock at the time of a vehicle collision, for example, Patent Document 1 describes a structure in which a fragile portion is provided on a slide member that slidably supports a seat cushion frame back and forth. . The fragile portion is deformed by the impact at the time of collision of the vehicle and absorbs the impact, and is disposed at the front portion of the slide member.

JP 2009-220744 A

In the vehicle seat described in Patent Document 1 described above, the fragile portion disposed in the front portion of the slide member can absorb the impact force at the time of the vehicle collision, but the occupant collides with the fragile portion of the slide member. It is desired to make it easier to transmit the load and to improve the impact absorption capacity.

The present invention has been made in view of the technical background as described above, and provides a vehicle seat that can sufficiently absorb an impact force generated at the time of a vehicle collision while having a simple structure. Is an issue.

A vehicle seat of the present invention that solves the above-described problems is a vehicle seat that includes a seat cushion, a seat back, and left and right slide rails that slidably support the seat cushion back and forth. The slide rail is characterized in that a fragile portion with respect to an impact load in the left-right direction is provided at the rear portion.

In the vehicle seat according to the present invention, since the fragile portion with respect to the impact load in the left-right direction is provided at the rear portion of the slide rail, when the impact load associated with the side collision of the vehicle and the rear impact acts on the slide rail from the left-right direction, The slide rail deforms in the left-right direction starting from the fragile portion, thereby absorbing the impact force generated when the vehicle collides. Therefore, although it is a simple structure, the impact force generated at the time of vehicle collision can be sufficiently absorbed.

The vehicle seat described above includes a seat back frame constituting a skeleton of the seat back, a side frame attached to the seat back frame, a slide member fixed to the upper rail of the slide rail, and the slide member. A connecting member that connects the side frame; and a plurality of fixing portions that connect the sliding member and the connecting member; and the fragile portion is provided at a rear portion of the sliding member. It is preferable that at least one is disposed at the rear part of the slide member.
In such a configuration, when an impact load in the left-right direction acts on the connecting member from the side frame, the impact load is easily transmitted from the fixed portion disposed at the rear portion of the slide member to the fragile portion located nearby. Therefore, when the vehicle collides, the slide member can be easily deformed starting from the fragile portion.

In the above-described vehicle seat, the slide member fixed to the upper rail of the slide rail has a first wall and a second wall that stand up crossing each other at a rear end portion, and the first seat It is preferable that the fragile portion is provided between the wall and the second wall.
In such a configuration, when an impact load in the left-right direction acts on the second wall, for example, the second wall is bent and deformed in one of the left and right directions along the plane direction of the first wall. Therefore, one of the first wall and the second wall can be bent and deformed in one of the left and right directions along the other plane direction.

In the vehicle seat described above, the first wall is a rear wall that rises upward from the rear end of the slide member, and the second wall is a side wall that rises upward overlapping the connecting member. In addition, it is preferable that a notch portion opened upward is provided as the fragile portion between the rear wall and the side wall.
In such a configuration, when an impact load in the left-right direction acts on the connecting member, the side wall of the slide member is bent and deformed by bending in the left-right direction along the plane direction of the rear wall. Therefore, the side wall of the slide member can be bent and deformed in one of the left and right directions along the plane direction of the rear wall, and the impact load in the left and right direction can be absorbed.

In the vehicle seat described above, it is preferable that the fragile portion is provided below the at least one fixing portion.
Further, in the vehicle seat described above, the notch as the fragile portion is positioned behind the axis of the fixed portion disposed at the rear portion of the slide member, and the notch is the shaft. It preferably extends to a position below the center.
Moreover, in the vehicle seat described above, the first wall includes a first hole, and the notch as the fragile portion extends to a position below the lower end of the first hole. Is preferred.
Moreover, in the vehicle seat described above, it is preferable that the notch portion extends to a position below the lower end of the second hole in which the fixing portion is inserted.
In such a structure, a connection member can be easily changed from a weak part with a slide member.

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 the collision of the vehicle seat of one embodiment. FIG. 6 is a partial rear view illustrating the behavior of the right connection bracket and the slide rail at the time of a collision of the vehicle seat according to the embodiment. FIG. 9 is a partial rear view showing the behavior of the left connecting bracket and the slide rail at the time of a collision of the vehicle seat according to the embodiment, (a) showing the left connecting bracket shown in FIG. 2, and (b) showing FIG. 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. It is a perspective view which shows the modification of the support bracket 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 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 pan 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 connecting bracket 40 as an example of a connecting member 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.

The left side frame 23 is welded while holding the outer surface of the lower end portion on the left side of the pipe frame 21. A lower end portion of the left side frame 23 is connected to a left connecting bracket 50 as an example of a connecting member disposed on the left rear portion of the seat cushion frame 10 so as to be tiltable forward and backward.

The support bracket 24 also serves as a support member for an armrest (not shown), and has a support pin 24A for supporting the armrest so that it 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 guide connecting portion 22 A is obliquely 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 formed as a sliding guide portion 22D for sliding the right end portion of the upper elastic support member 25 backward. The sliding guide portion 22D is inclined obliquely so as to be positioned 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.

Further, a slide restricting portion (forward slide restricting portion) 22E that restricts forward sliding is set in a portion that bends outside the front portion of the slide guide portion 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.

Also, at the rear end portion of the sliding guide portion 22D, there is provided a position restricting portion 22F that functions as a stopper for stopping the right end portion of the upper elastic support member 25 sliding rearward at a predetermined end position. 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 protruding relief portion (an angle shape) 22G is formed on 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 and 24 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 33D is a first wall that rises upward from the rear part of the slide member 33, and the side wall 33C is a second wall that rises upward while overlapping the inner surface of the right connection bracket 40. 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 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 rear wall 33 D is provided with a first hole 34 for inserting a clip of a cover (not shown) that covers the right connection bracket 40, and the fragile portion 33 E has a lower end of the first hole 34. It extends to a position below.
Further, as shown in FIG. 8, the right slide member 33 is provided with a second hole 35 for inserting the bolt shaft portion of the bolt / nut BN, and the fragile portion 33E has a second hole. It extends to a position below the lower end of 35.

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, a fragile part is provided around the lower part of the right side frame 22 on the side of high rigidity. In other words, the rear portion of the right connecting bracket 40 connected to the lower portion of the right side frame 22 on the higher rigidity side is vulnerable to induce deformation due to the torsional force around the vertical axis of the seat back frame 20. A portion 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 has front and rear beads for expansion and swell, ie, a front vertical bead 42 and a rear vertical bead 43, which bulge outward from the left connecting bracket 50. 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 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 upward extension line of the rear vertical bead 43 intersects with the stepped portion of the fragile portion 41.

Here, as shown in FIG. 5, the left connecting bracket 50 has a stiffening vertical bead 51 bulging 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 of the vehicle seat S configured as an embodiment of the vehicle seat according to the present invention will be described. During driving of the vehicle in which the vehicle seat S shown in FIG. 1 is disposed in the driver's seat, during normal driving in which the pressing force acting on the seat back S2 from the upper body of the occupant seated on the seat cushion S1 is within a predetermined range. 2 and 3, the right end portions of the upper elastic support member 25 and the lower elastic support member 26 are locked to the sliding restricting portion 22E at the front portion of the sliding guide portion 22D shown in FIG. It is in. 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 a load is applied from the upper body of the occupant toward the seat back S2 at the time of a vehicle collision such as a side collision or a rear collision of the vehicle, the upper elastic support member 25 and the lower elastic support member 26 are moved. It bends greatly backwards. 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 vehicle collision, a pipe frame 21 provided with a side frame 23 having low rigidity is attached as shown in FIG. 12 due to a shocking backward movement load applied to the seat back S2 (see FIG. 1). The seat back frame 20 is twisted counterclockwise around the vertical axis by tilting the left side of the rear side of the pipe frame 21 to a greater extent than the right side of the pipe frame 21 to which the highly rigid side frame 22 is attached. 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 when the vehicle collides 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 high rigidity, the fragile portion 41 having low rigidity is the starting point in the event of a vehicle collision. As a result, the right connecting bracket 40 is deformed. As a result, the impact force generated when the vehicle collides 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 1 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. It is easy to do (refer Fig.14 (a)). 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 when the vehicle collides 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. 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 vehicle collision is more easily absorbed.

Furthermore, as shown in FIG. 11, the vertical bead 51 provided on the left connection bracket 50 is divided into upper and lower parts, and intersects with the vertical bead 51 in a form that swells in the same direction as the vertical bead 51. When the extending lateral bead 53 is formed, the left connecting bracket 50 can be easily deformed inward from the lateral bead 53. Therefore, in this case, the right connecting bracket 40 is more easily deformed from the fragile portion 41, and the impact force generated at the time of the vehicle collision 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 in the event of a vehicle collision sinks deep toward the right side frame 22 having high rigidity, and this rearward movement load is added to increase the rigidity of the occupant's upper body. The right connection bracket 40 disposed at the lower portion of the side frame 22 is more easily deformed from the fragile portion 41. Therefore, the impact force generated at the time of a vehicle collision is absorbed 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, when the vehicle collides, 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 is more easily deformed from the fragile portion 41. Will come to do. Therefore, the impact force generated at the time of a vehicle collision is absorbed more easily.

Here, in the vehicle seat according to the embodiment, a fragile portion 33E 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 connection bracket 40 is deformed outward in the right direction starting from the fragile portion 41 at the time of a vehicle collision, the side wall 33C of the slide member 33 falls together with the right connection bracket 40 to the right outside, so that the right connection bracket 40 is It helps to deform from the fragile portion 41. As a result, the impact force generated when the vehicle collides is more fully 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 constituted 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.

As shown in FIG. 7, the side wall 33C of the slide member 33 is connected to the lower portion of the right connection bracket 40 by front and rear bolts and nuts BN, and the weakened portion 33E formed at the rear portion of the slide member 33 is The right and left connecting brackets 40 are cut out to a position below the position of the bolts and nuts BN arranged at the rear part. Further, the fragile portion 33E extends to a position below the lower end of the first hole 34 for inserting a clip of a cover (not shown) that covers the right connection bracket 40. For this reason, the right connection bracket 40 is easily deformed from the fragile portion 33 E together with the side wall 33 C of the slide member 33.
In addition, since the fragile portion 33E is located behind the bolt / nut BN disposed at the rear portion of the right connecting bracket 40, the right connecting bracket 40 is easily deformed.

According to the vehicle seat S of the embodiment, since the right connecting portions of the upper elastic support member 25 and the lower elastic support member 26 are connected to the seat back frame 20 so as to be capable of being guided rearwardly, the vehicle seat S is provided. When a rearward moving load is applied from the upper body of the occupant toward the seat back S2 at the time of a collision, the upper body of the occupant can be submerged deeply into the seat back S2, and the head of the occupant can be brought closer to the headrest S3. The head and neck of the occupant can be effectively protected.

Further, when a shocking backward movement load acts on the seat back S2 from the upper body of the occupant during a vehicle collision, the left side of the pipe frame 21 to which the side frame 23 having low rigidity is attached is connected to the side having high rigidity. The seat back frame 20 can be twisted counterclockwise about the vertical axis by tilting backward from the right side of the pipe frame 21 to which the frame 22 is attached. Since the right connection bracket 40 disposed at the lower portion of the frame 22 can be deformed from the weakened portion 41 to the right outside, the impact force generated at the time of the vehicle collision can be sufficiently absorbed.

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 connecting bracket 40 can be deformed starting from the portion 41. As a result, it is possible to absorb the impact force generated when the vehicle collides. 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.

In addition, since a fragile portion 33E 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, the right connecting bracket 40 starts from the fragile portion 41 to the right outside when the vehicle collides. When deforming, the side wall 33 C of the slide member 33 falls together with the right connection bracket 40 to the outside in the right direction to help the right connection bracket 40 to deform from the fragile portion 41. Therefore, the impact force generated at the time of a vehicle collision 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 the impact force generated at the time of the vehicle collision can be absorbed. it can.

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.

Further, 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. In the example shown in FIG. 15, the fragile portion 33 G is a short long hole (slit) formed in a portion corresponding to the rear end portion of the right connection bracket 40, but from the rear end portion of the right connection bracket 40 in the front-rear direction. It is good also as a long long hole (slit) formed over the part corresponding to a center part. The fragile portion may be provided as a notch in the upper rail 32 or the lower rail 31 instead of being provided in the slide member 33.

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).

On the other hand, the support bracket 24 shown in FIG. 5 can be changed to the support bracket 28 shown in FIG. The support bracket 28 has fixing portions (holding portions) 24B and 24B and fixing pins (holding portions) 28B and 28B and support pins 28A corresponding to the support pins 24A shown in FIG. 5, and the support pins 28A protrude. The base portion 28C to be bent is processed into a highly rigid cross-sectional shape.

Such a support bracket 28 is provided with a space between the upper and lower fixing parts (holding parts) 28B, 28B and the base part 28C, for example, when viewed from above. In the support bracket 28, upper and lower fixing parts (holding parts) 28B and 28B and a base part 28C are independently formed compactly.

Here, the lower end portion of the upper elastic support member 25 that extends downward from the portion held by the upper fixing portion (holding portion) 28B is engaged with the upper edge portion on the inner surface side of the base portion 28C. By being stopped, it is prevented from being inadvertently detached from the upper fixing portion (holding portion) 28B. Further, the left end portion of the lower elastic support member 26 is locked to the lower edge portion on the inner surface side of the base portion 28C at a portion extending upward from the portion held by the lower fixing portion (holding portion) 28B through the space. Thus, it is prevented from being inadvertently detached from the lower fixing portion (holding portion) 28B.

The fixing portions (holding portions) 24B and 24B of the support bracket 24 shown in FIG. 5 or the fixing portions (holding portions) 28B and 28B of the support bracket 28 shown in FIG. 16 are inductively coupled as shown in FIG. Similarly to the portion 22A, the left end portions of the upper elastic support member 25 and the lower elastic support member 26 may be changed to a structure that can be guided backward.

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 of one embodiment can be configured as a bucket type vehicle seat in which the seat cushion S1, the seat back S2, and the headrest S3 are integrally formed.

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

Claims

Seat cushions,
Seat back,
A vehicle seat comprising left and right slide rails that slidably support the seat cushion back and forth,
At least one of the slide rails is provided with a fragile portion against the impact load in the left-right direction at the rear portion.
A seat back frame constituting the skeleton of the seat back;
A side frame attached to the seat back frame;
A slide member fixed to the upper rail of the slide rail;
A connecting member for connecting the slide member and the side frame;
A plurality of fixing portions for connecting the slide member and the connecting member;
The fragile part is provided at the rear part of the slide member,
The vehicle seat according to claim 1, wherein at least one of the fixed portions is disposed at a rear portion of the slide member.
The slide member fixed to the upper rail of the slide rail has a first wall and a second wall that stand up crossing each other at the rear end portion,
The vehicle seat according to claim 1, wherein the fragile portion is provided between the first wall and the second wall.
The first wall is a rear wall that rises upward from the rear end of the slide member, and the second wall is a side wall that rises upward overlapping the connecting member,
The vehicle seat according to claim 3, wherein a notched portion opened upward is provided as the fragile portion between the rear wall and the side wall.
The vehicle seat according to any one of claims 2 to 4, wherein the fragile portion is provided below the at least one fixed portion.
A seat back frame constituting the skeleton of the seat back, and left and right side frames attached to the seat back frame and having different rigidity from each other;
The vehicle seat according to claim 1, wherein the fragile portion is provided at a rear portion of at least one slide rail.
The vehicle seat according to claim 4, wherein the first wall includes a first hole, and the notch extends to a position below a lower end of the first hole. .
A seat back frame constituting the skeleton of the seat back;
A side frame attached to the seat back frame;
A slide member fixed to the upper rail of the slide rail;
A connecting member for connecting the slide member and the side frame;
A plurality of fixing portions for connecting the slide member and the connecting member;
The fragile part is provided at the rear part of the slide member,
At least one of the fixed portions is disposed at a rear portion of the slide member, the notch portion is positioned rearward of an axis of the fixed portion disposed at a rear portion of the slide member, and the notch portion is The vehicle seat according to claim 4, wherein the vehicle seat extends to a position below the axis.
The vehicle seat according to claim 8, wherein the notch portion extends to a position below a lower end of the second hole in which the fixing portion is inserted.