JP6703290B2 - Vehicle seat - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vehicle seat such as a vehicle seat, and more particularly to a vehicle seat that provides a good occupant seating feeling during a rear-end collision.

During a so-called rear-side collision such as a rear-end collision of a vehicle or a rear-end collision, the head of a seated occupant leans backward due to inertia, and the neck is May be shocked.

Therefore, the vehicle seat is provided with a headrest above the seat back to receive the occupant's head from the rear in order to protect the occupant's head and neck from the impact of a rear collision and reduce the impact on the neck. There is. Then, in order to effectively reduce the impact at the time of the rear-side collision, it is desirable to quickly reduce the gap between the occupant's head and the headrest at the time of the rear-side collision.

Therefore, at the time of a rear-end collision, the upper body of the occupant is moved rearward, the load due to this movement is received by the pressure receiving member to move the headrest forward, and the occupant's head is supported to reduce the impact on the neck. A structured seat back has been proposed (Patent Document 1).

Further, in the seat back frame of the vehicle seat described in Patent Document 1, the left and right side frames have a plate-shaped lower frame (lower connecting member) at a lower portion, and a reclining operation arranged in front of the lower frame. They are connected to each other by a dynamic supporting shaft. The lower frame may not have a simple plate shape as in Patent Document 2, but may have flanges extending forward at the upper and lower ends. In a normal sitting posture, these lower frames are in a substantially vertical posture, and are in a posture in which they are slightly laid down in front of the upper portion of the backrest (the portion where the upper back of the occupant touches).

JP, 2010-083269, A JP, 2008-067723, A

By the way, since the lower connecting member receives a load from an occupant in a rear-end collision, it is desired that the lower connecting member be fixed to the side frame with sufficient strength.

The present invention has been made in view of the above background, and an object thereof is to fix the lower connecting member to the side frame with sufficient strength.

A vehicle seat of the present invention that solves the above-mentioned problems includes a seating frame that is a frame of a seating portion on which an occupant sits, and a seatback frame supported by the seating frame.
The seatback frame includes left and right side frames that are spaced apart from each other, and a lower connecting member that is arranged so as to be passed between the lower portions of the left and right side frames and that connects the left and right side frames.

Each of the left and right side frames has a side wall portion and an inner extending portion that extends inward in the left-right direction from a rear end of the side wall portion and is located apart from each other.

The lower connecting member has a front wall portion arranged on the occupant side and a rear wall portion connected to the rear of the front wall portion. The rear wall portion is formed with a through hole into which another member enters. The through hole overlaps the front wall portion in the front-rear direction.

With such a configuration, the lower connecting member can be fixed to the side frame with sufficient strength.

Further, in the vehicle seat described above, the front wall portion may be configured to extend away from the rear wall portion as the distance from the connecting portion between the front wall portion and the rear wall portion increases.

Further, in the above-described vehicle seat, the seat back frame is configured to be reclining with respect to the seat frame, and a shaft that connects the left and right side frames is arranged on the rotation axis of the seat back frame. It may be configured to be located between the wall portion and the front wall portion.

Further, in the above-described vehicle seat, the shaft may be provided at a position where the distance between the front wall portion and the rear wall portion is widest.

Further, in the above-described vehicle seat, a configuration may be adopted in which a bent portion that is inclined forward is formed at the front end portion of the rear wall portion.

According to the present invention, the lower connecting member can be fixed to the side frame with sufficient strength.

It is a perspective view of a vehicle seat. It is a perspective view of a seat frame. It is an expansion perspective view of a lower connection member. It is a figure (a) and (b) explaining the angle of the front of a front wall part. It is the figure which looked at the seat back frame which shows the welded part of a back wall part and an inside extension part from the back. It is a sectional side view explaining the attachment structure of the cover of the back of a seat back. It is a side sectional view showing a seat back frame at the time of normal. It is a sectional side view which shows a seat back frame at the time of a weak rear surface collision. It is a side sectional view showing a seat back frame at the time of a strong back collision. It is a sectional side view of the lower connection member concerning a modification. It is a perspective view which shows the modification of the relief part of a lower connection member.

An embodiment of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, a vehicle seat S, which is an example of a vehicle seat according to the present invention, includes a seat back S1, a seating portion S2, and a headrest S3. In the present specification, front, rear, left and right are based on an occupant seated on the vehicle seat S in a normal state in which the seat back S1 is set up (not lying on the back due to reclining).

In the vehicle seat S, a seat frame F as shown in FIG. 2 is provided. The seat frame F includes a seat back frame 1 which is a frame of the seat back S1 and a seating frame 2 which is a frame of the seating portion S2. The seating frame 2 and the seat back frame 1 are connected via a reclining mechanism 3 (detailed structure is not shown). A cushion and a skin are provided on the outside of the seat back frame 1 and the seating frame 2, and a cover 5 (see FIG. 6) as an example of an attached member is attached to the back surface with a clip 51 as an example of a fixing member. As a result, the seat back S1 and the seating portion S2 are configured.

The seat back frame 1 connects the side plates 10 that are spaced apart from each other on the left and right and extends in the vertical direction, the upper frame 21 that connects the upper end portions of the side plate 10 and the lower end portions of the left and right side plates 10. The lower connecting member 30 and the lower connecting member 30 form a frame shape. The upper frame 21 is formed by bending a metal pipe in a U shape, and has an upper connecting portion 21A extending left and right, and a connecting portion 21B extending downward from the left and right ends of the upper connecting portion 21A. The connection portion 21B is connected to the upper end of the side plate 10 by welding.

The side plate 10 is composed of a lower member 12 made of a metal plate provided at a lower end portion, and an upper member 11 integrally formed on the upper portion of the lower member 12 by welding. The lower member 12 includes a side wall portion 12A and an inner extending portion 13 that extends inward from the rear end of the side wall portion 12A.

As shown in FIG. 5, the inner extending portion 13 has an inclined edge portion 13A that is inclined at an angle γ with respect to the vertical direction so that the inner end portion goes from the inner side to the outer side from the upper side to the lower side. ing. The inclined edge portion 13A is a portion for welding the lower connecting member 30 and the inner extending portion 13 as described later. Further, the inner extending portion 13 has a clip hole 13B as an example of a mounting hole into which a clip 51 for mounting the cover 5 on the back surface of the seat back S1 is inserted.

Returning to FIG. 2, the side frame SF of the seatback frame 1 is composed of the side plate 10 and the connecting portion 21B of the upper frame 21. A pressure receiving member 40 made of a plate-shaped resin is arranged between the left and right side frames SF, and the pressure receiving member 40 has a connecting wire (connecting wire) formed of a bent wire having a spring property at two upper and lower positions. (Member) 41 and is connected to the left and right side frames SF. Specifically, the upper connecting wire 41 has its end engaged with a bracket 43 welded to the connecting portion 21B, and the lower connecting wire 41 has a lower end whose front end can swing back and forth. Is linked to. The rotating member 45 is fixed to the side plate 10 (upper member 11). Normally, the lower end of the arm is located at the front, as disclosed in JP 2010-179748 A, but is connected. When a large rearward force is applied from the wire 41, the lower end swings rearward so that the pressure receiving member 40 can be largely moved rearward.

A pillar support portion 23 is provided on the upper frame 21, and a headrest frame (not shown) is provided on the pillar support portion 23. The headrest S3 is configured by providing the cushion member on the outer side of the headrest frame.

Next, details of the lower connecting member 30 will be described. The lower connection member 30 is arranged so as to be passed between the lower parts of the left and right side frames SF. As a result, even when a load from the side is received, the seat frame F is prevented from being crushed in the left-right direction, and the load from the side can be transmitted to the center of the vehicle.

The lower connection member 30 is made of sheet metal, and as shown in FIG. 3, the front wall portion 31, the rear wall portion 32, and the rear wall portion 32 extending rearward from the upper end of the front wall portion 31 to connect the front wall portion 31 and the rear wall portion 32. The upper wall portion 33, the lower flange 34, and the folded flange 35 are provided.

The front wall portion 31 is located in front of the shaft 3S included in the reclining mechanism 3. The shaft 3S is disposed on the rotation axis of the seat frame 2 and the seatback frame 1, and is provided so as to connect the left and right side frames SF to each other in order to support the rotation by the reclining mechanism 3. Since the front wall portion 31 of the lower connection member 30 is located in front of the shaft 3S, the load applied from the occupant's buttocks or the like through the seat back cushion is not directly applied to the shaft 3S but is applied to the front wall portion 31. Therefore, the occupant can reduce the feeling of hitting from the shaft 3S at the buttocks and the like.

As shown in FIG. 4(a), the front wall portion 31 has a front surface 31A that is oblique so that the front surface 31A is parallel to the direction in which the connection portion 21B extends (straight line L1) or is upward with respect to the extending direction in a side view. It has become. In the example of FIG. 4A, the front surface 31A faces upward at an angle α with respect to the straight line L1. Further, the front wall portion 31 also faces upward with respect to the rear wall portion 32 at an angle β. As a result, the front wall portion 31 and the rear wall portion 32 are connected at the upper end and have a shape that opens downward, so that it is possible to secure a stroke in which the front wall portion 31 is deformed rearward in the event of a rear surface collision. The connecting portion 21B, which is a pipe configuring the side frame SF, is not straight when placed in a side view, and as shown in FIG. May be warped. In such a case, the angle of the front surface 31A with respect to the pipe (connecting portion 21B) refers to the angle with the most standing direction of the pipe.

The lower end of the front wall portion 31 extends below the lower end of the rear wall portion 32. As a result, the front wall portion 31 can be made larger, and the occupant's feeling of hitting the lower connecting member 30 can be reduced, and the length from the upper end to the lower end of the front wall portion 31 allows the front wall portion 31 at the time of a rear collision. It becomes easy to deform the rearward.

The rear wall portion 32 is a wall that is connected to the side frame SF (the inner extending portion 13), and is a member that connects and supports the lower connecting member 30 to the side frame SF. Specifically, as shown in FIG. 4A, the rear surface of the rear wall portion 32 is aligned with the front surface of the inner extending portion 13, and as shown in FIG. 5, the inclined edge portion 13A of the inner extending portion 13 is formed. The inner extending portion 13 and the rear wall portion 32 are welded along. Since the slanted edge portion 13A is slanted with respect to the vertical direction, even if there is little overlap in the height direction between the slanted edge portion 13A and the rear wall portion 32, the welding length is increased to provide the necessary welding strength. You can keep it. The angle γ of the inclined edge portion 13A is preferably 20 degrees or more. When the angle γ is 20 degrees or more, the effect of increasing the welding length becomes large. The angle γ is more preferably 30 degrees or more, further preferably 40 degrees or more. Further, by setting the angle γ to 70 degrees or less, it is possible to prevent the inner extending portion 13 from becoming excessively acute.
Further, since the rear wall portion 32 is fixed to the side frame SF, the rearward movement of the rear wall portion 32 is suppressed at the time of a rear surface collision, and the front wall portion 31 and the rear wall portion 32 are easily deformed at the connecting portion. Therefore, the rearward movement of the front wall portion 31 is easily controlled.

As described above, the lower connecting member 30 of the present embodiment has the front wall portion 31 and the rear wall portion 32 that is connected to the front wall portion 31. Therefore, as compared with a simple plate-like lower connecting member. As a result, the rigidity against crushing in the left-right direction is increased, and the load from the side can be efficiently transmitted to the center of the vehicle.

As shown in FIG. 3, the upper wall portion 33 has a flat plate shape extending substantially in the front-rear direction. Accordingly, the upper end of the front wall portion 31 and the upper end of the rear wall portion 32 are appropriately separated from each other in the front and rear direction, and when the front wall portion 31 is deformed rearward, the deformation stroke can be increased. The connecting portion between the front wall portion 31 and the upper wall portion 33 has a gentle R shape formed by bending between the upper wall portion 33 and the front wall portion 31 to have a gentle shape without edges. There is.

The lower flange 34 is bent rearward from the lower end of the front wall portion 31 below the shaft 3S and extends rearward. The connecting portion between the front wall portion 31 and the lower flange portion 34 also has a gentle shape without an edge due to a natural R shape formed by bending between the lower flange portion 34 and the front wall portion 31. Further, the lower flange 34 is not connected to the rear wall portion 32, so that the lower connecting member 30 does not have a closed cross-sectional shape. As described above, the lower flange 34 and the rear wall portion 32 are not connected to each other and there is a gap therebetween, so that the front wall portion 31 can be easily deformed rearward.

The folding flange 35 is folded back forward from the rear end of the lower flange 34, and the front end of the folding flange 35 is located rearward of the lower end of the front wall portion 31. As described above, since the lower connecting member 30 includes the lower flange 34 and the folded flange 35, the cross-sectional area of the lower connecting member 30 increases. Therefore, the rigidity in the left-right direction is improved, and the load transmission to the side is improved. Further, since the front end of the folding flange 35 is located rearward of the lower end of the front wall portion 31 (the connecting portion of the front wall portion 31 and the lower flange 34), the edge of the front end of the folding flange 35 at the time of a rear surface collision. Since the seat back cushion is not strongly hit, it is possible to suppress the occupant's feeling of hitting the lower connection member 30 and suppress the damage to the seat back cushion.

Through holes 38 are formed at two positions on the left and right sides of the rear wall portion 32 of the lower connecting member 30, specifically, from the rear wall portion 32 to the upper wall portion 33. As shown in FIG. 6, the through hole 38 is provided to prevent the tip of the clip 51 from interfering with the rear wall portion 32 of the lower connecting member 30 when the back cover 5 is attached to the clip hole 13B with the clip 51. Functions as an escape area. Therefore, the through hole 38 is provided at a position corresponding to each clip hole 13B.

As shown in FIG. 5, the lower connecting member 30 does not reach the side wall portion 12A, and a slight gap is provided between the lower connecting member 30 and the side wall portion 12A. However, when the manufacturing error of the lower connecting member 30 and the riding of the lower connecting member 30 on the corner of the lower member 12 do not pose a problem, both ends of the lower connecting member 30 are configured to abut against the side wall portion 12A. Good.

The operation of the vehicle seat S having the above-described configuration at the time of a rear-end collision will be described.
As shown in FIG. 7, before a rear surface collision occurs, the lower end of the rotating member 45 is swung forward, and the pressure receiving member 40 is located at the frontmost position in the movable range. 7 to 9, the illustration of the rotating member 45 is omitted, but in the normal state of FIG. 7, the lower end of the rotating member 45 is located forward.

When a comparatively weak rear surface collision occurs, as shown in FIG. 8, the central portion of the seatback cushion 50 (the portion on which the back of the occupant P contacts) moves backward, and the seatback cushion 50 moves the pressure receiving member 40 backward. By pushing, the pressure receiving member 40 moves backward. At this time, the lower end of the rotating member 45 swings backward. In addition, the lower portion of the seatback cushion 50 (the portion where the buttocks of the occupant P contact) has its inner surface side contacted with the front surface 31A of the lower connection member 30 and is slightly deformed. However, since the front surface 31A has a wide surface and is inclined slightly upward with respect to the connection portion 21B and the rear wall portion 32, the buttock of the occupant P receives a small reaction force from the lower connection member 30. It acts as a pressure, and the occupant P receives a soft feeling from the lower connecting member 30. In addition, since the connecting portion between the front wall portion 31 and the upper wall portion 33 of the lower connecting member 30 and the connecting portion between the front wall portion 31 and the lower flange 34 are gently curved surfaces, the occupant P is in the lower portion. There is no strong hit feeling from the connecting member 30. Further, since the front end of the folding flange 35 is located rearward of the lower end of the front wall portion 31, the edge of the front end of the folding flange 35 does not strongly hit the inner surface of the seat back cushion 50, and the seat back cushion is not damaged. The damage of 50 can be suppressed. Further, since the front wall portion 31 is located in front of the shaft 3S, the seat back cushion 50 does not directly contact the shaft 3S. Therefore, the occupant P does not feel the hit of the shaft 3S.

When a relatively strong rear surface collision occurs, as shown in FIG. 9, the central portion of the seat back cushion 50 moves largely backward, and accordingly, the pressure receiving member 40 also moves rearward while the connecting wire 41 elastically deforms. Move big. At this time, the seat back cushion 50 strongly hits the front surface 31A of the lower connecting member 30, and the lower connecting member 30 is bent and deformed at the connecting portion between the front wall portion 31 and the rear wall portion 32 including the upper wall portion 33. .. Therefore, even if a strong force is applied to the seat back cushion 50 from the buttocks of the occupant P, the front wall portion 31 of the lower connection member 30 moves rearward to absorb the impact, and the occupant P has a strong buttocks. There is no sense of hit. Particularly, in the vehicle seat S of the present embodiment, since the flat plate-shaped upper wall portion 33 extending substantially in the front-rear direction is provided between the front wall portion 31 and the rear wall portion 32, the front wall portion 31 and the rear wall portion 32 are It is possible to secure a space between them and increase the stroke of rearward deformation of the front wall portion 31, that is, the amount of shock absorption.

Then, as in the case where a light rear surface collision occurs, the connecting portion between the front wall portion 31 and the upper wall portion 33 of the lower connecting member 30 and the connecting portion between the front wall portion 31 and the lower flange 34 are gentle. Because of the curved surface, the occupant P is less likely to feel a strong hit from the lower connecting member 30. Further, since the front end of the folding flange 35 is located rearward of the lower end of the front wall portion 31, the edge of the front end of the folding flange 35 does not hit the inner side surface of the seat back cushion 50 strongly, and the seat back cushion is prevented. The damage of 50 can be suppressed. Further, since the front wall portion 31 is located in front of the shaft 3S, the seatback cushion 50 does not directly contact the shaft 3S, so that the occupant P can be less likely to hit the shaft 3S.

Further, in the vehicle seat S of the present embodiment, the lower connecting member 30 does not have a flat plate shape as in the conventional case, but has the front wall portion 31 and the rear wall portion 32 that are connected to each other at the upper portion, Overall, the rigidity against bending load in the front-rear direction is also improved. Therefore, in the past, in the case of a rear-end collision, the center of the lower frame was bent rearward with respect to the side frame so that it was bent in a V shape in plan view, and accordingly, the front end of the side frame was also deformed so that the front end came to the left and right inward. However, such deformation is unlikely to occur in the vehicle seat S of the present embodiment. In other words, the lower connecting member 30 is easily deformed such that the front wall portion 31 approaches the rear wall portion 32, but it is difficult for the lower portion to be bent like a dogleg in a plan view as a whole. Deformation can also be suppressed. Further, since the lower connecting member 30 is provided so as to be passed to the left and right side frames SF, when the side frame SF is subjected to a load such that the side frame SF is deformed inward, the front wall portion 31 has the inner surface of the side frame SF. By hitting, the deformation of the side frame SF can be suppressed.

Further, in the vehicle seat S of the present embodiment, the lower connecting member 30 is arranged so as to be passed over the left and right side frames SF, and the front wall portion 31, the rear wall portion 32, the upper wall portion 33, the lower flange 34, and Since the folding flange 35 has a sufficient cross-sectional area, when the vehicle receives a collision load from the side surface, the vehicle seat S is prevented from being crushed in the left-right direction, and the load from the side is applied to the vehicle. Can be transmitted to the center of. In particular, since the lower connecting member 30 is welded to the inner extending portion 13 of the side frame SF at the inclined edge portion 13A, it is fixed to the side frame SF with a long welding length and sufficient strength. As a result, the rigidity of the seatback frame 1 can be increased and the load from the side can be efficiently transmitted to the center of the vehicle. In other words, the welding length of the lower connecting member 30 and the inner extending portion 13 can be increased and the rigidity of the vehicle seat S in the left-right direction can be increased without increasing the vertical size of the lower connecting member 30. ..

Further, in the vehicle seat S of the present embodiment, since the rear wall portion 32 of the lower connection member 30 has the through hole 38 as an escape portion, when the cover 5 on the back surface of the seat back S1 is attached, The interference of the rear wall portion 32 is avoided, and the assembling work is easy. That is, even if there is some error in the size or shape of the rear wall portion 32, the interference between the clip 51 and the rear wall portion 32 can be avoided, so that the lower connection member 30 and the side frame SF can be assembled and the clip 51 can be attached. It is easy to work without needing to be overly careful. Further, since the relief portion is the through hole 38, when the lower connection member 30 made of sheet metal is manufactured by press working, the relief portion can be easily formed by blanking, which facilitates manufacturing.

Although the embodiments of the present invention have been described above, the present invention can be appropriately modified and implemented as shown in the following other modes.

For example, in the above-described embodiment, the lower connecting member 30 has the flat plate-shaped upper wall portion 33, but the upper wall portion 33' connecting the front wall portion 31 and the rear wall portion 32 is shown in FIG. As described above, the shape may be bent by one R.

Further, in the above-described embodiment, the escape portion of the lower connecting member 30 is formed by the through hole 38, but it may be formed by a recess 38' as shown in FIG. By using the recess 38 ′ instead of the through hole 38, the escape portion can be configured without reducing the strength of the rear wall portion 32, and the interference between the clip 51 and the rear wall portion 32 can be avoided.

In the above-described embodiment, the front surface 31A of the front wall portion 31 is inclined so as to face upward with respect to the extending direction of the pipe of the connecting portion 21B in a side view, but may be parallel to the extending direction of the pipe.

In the above-described embodiment, the pressure receiving member 40 is provided, and the occupant P is positively moved into the seat back S1 at the time of a rear-end collision, but the present invention is applied to a seat having no pressure receiving member 40. Good. However, when the pressure receiving member 40 is provided, the lower connecting member 30 and the occupant P easily come close to each other, so that the present invention can be effectively utilized in such a case.

In the above-described embodiment, the inclined edge portion 13A of the inner extending portion 13 is inclined with respect to the vertical direction such that the inner end portion goes from the inner side to the outer side from the upper side to the lower side. On the contrary, the inner end may be inclined with respect to the vertical direction so that the inner end goes from the outer side to the inner side from the top to the bottom.

Although the pressure receiving member 40 is supported by the side frame SF by the connecting wire 41 in the above-described embodiment, it may be supported by the side frame SF by another connecting member such as rubber or a belt.

In the above embodiment, the cover on the back of the seat back is illustrated as an example of the attached component, but a harness, switches operated in the back seat, a pocket on the back of the seat back, etc. may be attached as the attached component. it can. Further, the mounting hole may be a hole into which a tapping bolt is screwed in or a female screw hole, and the fixing member may be a bolt, a tapping bolt, a rivet or the like.

Further, in the above-described embodiment, the vehicle seat S is shown as an application example of a vehicle seat, but the vehicle seat of the present invention is applied to other vehicle seats, for example, seats for ships and aircraft. You can also

1 Seat Back Frame 2 Seating Frame 3 Reclining Mechanism 3S Shaft 5 Cover 10 Side Plate 11 Upper Member 12 Lower Member 12A Side Wall 13 Inner Extension 13A Inclined Edge 13B Clip Hole 21 Upper Frame 21A Upper Connection 21B Connection 23 Pillar Support 30 Lower Connecting Member 31 Front Wall Part 31A Front Surface 32 Rear Wall Part 33 Upper Wall Part 33' Upper Wall Part 34 Lower Flange 35 Folding Flange 38 Through Hole 38' Recess 40 Pressure Receiving Member 50 Seat Back Cushion 51 Clip F Seat Frame S Vehicle Seat S1 Seat back S2 Seating S3 Headrest SF Side frame

Claims (5)

A seat for a vehicle comprising a seating frame that is a frame of a seating portion on which an occupant sits, and a seat back frame supported by the seating frame,
The seatback frame includes side frames that are spaced apart from each other on the left and right sides, and a lower connection member that is disposed so as to be passed between the lower portions of the left and right side frames and that connects the left and right side frames,
The left and right side frames each have a side wall portion and an inner extending portion that extends inward in the left-right direction from a rear end of the side wall portion and are located apart from each other,
The lower connecting member, a front wall portion arranged on the occupant side, a rear wall portion connected to the rear of the front wall portion, a lower flange that is bent rearward from the lower end of the front wall portion and extends rearward, have,
The rear wall portion is formed with a through hole into which another member is inserted,
A vehicle seat , wherein a lower end of the lower flange is provided below a lower end of the through hole . The vehicle seat according to claim 1, wherein the front wall portion extends away from the rear wall portion as the front wall portion and the rear wall portion are connected to each other. The seat back frame is configured to be reclining with respect to the seat frame, and a shaft that connects the left and right side frames is arranged on the rotation axis of the seat back frame.
The vehicle seat according to claim 2, wherein the shaft is located between the rear wall portion and the front wall portion. The vehicle seat according to claim 3, wherein the shaft is provided at a position where the distance between the front wall portion and the rear wall portion is widest. The vehicle seat according to any one of claims 1 to 4, wherein a bent portion that is inclined forward is formed at a front end portion of the rear wall portion.

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