JP2020152238A - Vehicle seat - Google Patents

Abstract

To optimize transmission of load generated from a seat belt in a backrest frame in a vehicle seat having the seat belt.SOLUTION: A vehicle seat 1 has a backrest frame 40 of a backrest part 11. The backrest frame 40 includes: one shoulder part 20 in which an entrance part 31 of a seat belt 30 in the backrest part 11 is disposed; and a main frame 50 having a triangular frame shape connecting reclining parts 22 and 23 at both sides of a left and right direction as apexes.SELECTED DRAWING: Figure 2

Description

The present invention relates to a vehicle seat.

In general, the backrest frame, which is the skeleton of the backrest of the vehicle seat, is a side frame extending vertically from the shoulder to the reclining portion on both sides in the left-right direction, and the upper ends of the side frames on both sides thereof. It is equipped with a horizontal frame etc. to connect. Further, some vehicle seats have a seatbelt built in the backrest portion, and the seatbelt is taken in and out from one shoulder portion of the backrest portion.

In a vehicle seat with a built-in seatbelt as described above, a side frame on the shoulder side (hereinafter, also simply referred to as "seatbelt side") into which the seatbelt is taken in and out when the seatbelt is taken out. In addition, it is easy to apply a load. In this regard, Patent Document 1 discloses a technique for reinforcing the side frame on the seat belt side.

Japanese Unexamined Patent Publication No. 2013-193586

However, in the above-mentioned vehicle seat, the rigidity of the side frame on the seat belt side is relatively high, so that the load generated from the shoulder portion on the seat belt side is transmitted more to the highly rigid side frame, and the seat. It is biased toward the side frame on the belt side. As a result, the load is not transmitted so much to the side frame on the side opposite to the seat belt side (hereinafter, also simply referred to as "opposite side"), and as a result, the strength of the side frame on the opposite side may become excessive. .. In this case, the strength of the backrest frame is not effectively utilized, which eventually leads to an increase in the weight of the entire backrest frame.

The present invention has been made in view of the above points, and one of the objects thereof is to optimize the transmission of the load generated from the seat belt in the backrest frame in the vehicle seat having the seat belt.

The vehicle seat according to one aspect of the present invention is a vehicle seat provided with a seatbelt, and the backrest frame of the backrest portion is a shoulder portion on which the entrance / exit portion of the seatbelt in the backrest portion is arranged. It is equipped with a triangular frame-shaped main frame that connects the reclining portions on both sides in the left-right direction as vertices.

According to this aspect, in the main frame of the backrest frame, the load generated at one shoulder portion having the entrance / exit portion of the seat belt is directly and balancedly transmitted to the reclining portions on both sides. As a result, it is possible to optimize the transmission of the load generated from the seat belt in the backrest frame. As a result, it is possible to suppress the weighting of the entire backrest frame while ensuring the strength of the backrest frame.

The main frame may have a pipe shape extending along the triangular frame shape.

The backrest frame may further include a subframe that extends from one shoulder in the backrest to the reclining portion on the other shoulder side through the other shoulder.

Both ends of the subframe may be connected to the mainframe.

The width dimension in the direction perpendicular to the extension direction of the main frame may be larger than the width dimension in the direction perpendicular to the extension direction of the subframe.

According to the present invention, in a vehicle seat having a seatbelt, it is possible to optimize the transmission of the load generated from the seatbelt in the backrest frame.

It is a perspective view which shows an example of the structure of the vehicle seat. It is a perspective view which shows an example of the structure of the backrest frame. It is a front view of a backrest frame. It is an exploded view of the backrest frame. FIG. 3 is a sectional view taken along the line AA of the backrest frame of FIG.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The same elements are designated by the same reference numerals, and duplicate description will be omitted. Further, the positional relationship such as up, down, left and right shall be based on the positional relationship shown in the drawings unless otherwise specified. Furthermore, the dimensional ratios in the drawings are not limited to the ratios shown. In addition, the following embodiments are examples for explaining the present invention, and the present invention is not limited to this embodiment.

FIG. 1 is a perspective view showing an example of the appearance of the vehicle seat 1 according to the present embodiment.

For example, the vehicle seat 1 includes a seat portion 10 on which the seated person sits, a backrest portion 11 on which the seated person leans on his back, a headrest portion 12 on which the seated person rests his head, and the like.

An entrance / exit portion 31 of the seat belt 30 is provided on one shoulder portion 20 in the left-right direction of the backrest portion 11. The shoulder portion 20 is located on the side door side of the vehicle, and the other shoulder portion 21 is located on the center side in the left-right direction of the vehicle. The backrest portion 11 is configured to be tiltable with respect to the seat portion 10 via the reclining portions 22 and 23. The reclining portion 22 is located on the vehicle door side below the backrest portion 11, and the reclining portion 23 is located on the vehicle center side below the backrest portion 11.

As shown in FIGS. 2 and 3, the backrest portion 11 includes a backrest frame 40 as a skeleton inside. The backrest frame 40 includes, for example, a main frame 50 and a subframe 51.

The main frame 50 is made of metal, for example. The main frame 50 has a triangular frame shape that connects one shoulder portion 20 in which the entrance / exit portion 31 of the seat belt 30 in the backrest portion 11 is arranged and the reclining portions 22 and 23 on both sides in the left-right direction as vertices (corners). have. The main frame 50 extends horizontally from the bottom 60 extending horizontally between the two reclining portions 22 and 23 and upward from the end of the bottom 60 on the vehicle door side (reclining portion 22 side) to the shoulder portion 20. Three straight sides of the vertical side 61 and the inclined side 62 extending diagonally from the upper end of the vertical side 61 of the shoulder portion 20 to the end of the bottom 60 on the vehicle center side (reclining portion 23 side). Have.

The main frame 50 has a pipe shape extending along the triangular frame shape. For example, the main frame 50 has a configuration in which the front surface portion 70 and the rear surface portion 71 are joined to each other in the front-rear direction as shown in FIG. The front surface portion 70 has a triangular frame-shaped three-dimensional shape, and the rear surface portion 71 has a triangular frame-shaped plate shape.

As shown in FIG. 5, for example, the front surface portion 70 has a cross-sectional shape in which the vertical cross section cut in the direction perpendicular to the extending direction of the pipe of the main frame 50 is substantially U-shaped. The cross-sectional shape of the front surface portion 70 is a shape surrounding three directions, and one direction is an opening side 70a. The front surface portion 70 and the rear surface portion 71 are joined to each other so as to close the opening side 70a at the plate-shaped rear surface portion 71. As a result, the main frame 50 has a cross-sectional shape in which the vertical cross section cut in the direction perpendicular to the extending direction is rectangular. The front surface portion 70 and the rear surface portion 71 are joined by welding, for example.

As shown in FIGS. 2 and 3, the front surface portion 70 has an opening 80 inside the triangular frame shape, and the rear surface portion 71 has an opening 81 inside the triangular frame shape. The opening 81 of the rear surface portion 71 is smaller than the opening 80 of the front surface portion 70, and as a result, the exposed portion 82 exposed to the front surface side is formed on the rear surface portion 71. The exposed portion 82 is provided with a retractor device 90 for the seat belt 30.

A guide wire 91 for the seat belt 30 is provided at a position on the front side of the main frame 50 near the shoulder portion 20. The seat belt 30 passes through the guide wire 91 from the retractor device 90, and then protrudes from the entrance / exit portion 31 of the backrest portion 11.

The subframe 51 is connected to the main frame 50. The subframe 51 extends from the vicinity of the shoulder portion 20 of the main frame 50 to the vicinity of the reclining portion 23 of the main frame 50 through the other shoulder portion 21. The subframe 51 is, for example, a thin metal pipe, and has a cross-sectional shape in which the vertical cross section cut in the direction perpendicular to the extending direction is circular. The subframe 51 is thinner than the main frame 50 and has a small cross-sectional dimension. That is, the width dimension in the direction perpendicular to the extension direction of the main frame 50 is larger than the width dimension in the direction perpendicular to the extension direction of the subframe 51.

The subframe 51 has a horizontal side 110 extending horizontally from the shoulder portion 20 toward the shoulder portion 21, and a vertical side 111 extending downward from the shoulder portion 21 toward the reclining portion 23. ing. A support member 120 of the headrest portion 12 is fixed to the horizontal side 110.

Reclining frames 130 and 131 for connecting with the reclining portion of the seat portion 10 are attached in the vicinity of the reclining portions 22 and 23 of the main frame 50.

According to the present embodiment, the backrest frame 40 has the apex of one shoulder portion 20 in which the entrance / exit portion 31 of the seatbelt 30 in the backrest portion 11 is arranged, and the reclining portions 22 and 23 on both sides in the left-right direction. A main frame 50 having a triangular frame shape is provided. As a result, for example, when the vehicle suddenly stops, the seat belt 30 is pulled out, and the load generated on the shoulder portion 20 via the seat belt 30 is passed through the triangular frame-shaped main frame 50 on both sides as shown by the arrows in FIG. It is transmitted to the reclining portions 22 and 23 in a well-balanced manner (with a small bias). That is, it is possible to reduce the difference in the load distribution ratio from the shoulder portion 20 having the seat belt 30 to the reclining portions 22 and 23. Thereby, in the vehicle seat 1 having the seat belt 30, it is possible to optimize the transmission of the load generated from the seat belt 30 in the backrest frame 40. As a result, it is possible to suppress the weight increase of the entire backrest frame 40 while ensuring the strength of the backrest frame 40.

Since the main frame 50 has a pipe shape extending along the triangular frame shape, the weight of the backrest frame 40 can be reduced.

The backrest frame 40 extends from one shoulder portion 20 on the entrance / exit portion 31 side of the seat belt 30 in the backrest portion 11 through the shoulder portion 21 on the opposite side to the reclining portion 23 on the other shoulder portion 21 side. It includes a subframe 51. As a result, the shape of the backrest portion 11 near the shoulder portion 21 on the side opposite to the entrance / exit portion 31 of the seat belt 30 can be maintained. Further, the subframe 51 can be used as a member for fixing the support member 120 of the headrest portion 12.

Since both ends of the subframe 51 are connected to the main frame 50, another frame for connection is not required, and the weight of the backrest frame 40 as a whole can be reduced.

Since the width dimension in the direction perpendicular to the extension direction of the main frame 50 is larger than the width dimension in the direction perpendicular to the extension direction of the subframe 51, the strength of the main frame 50 for transmitting the load generated from the seat belt 30 is increased. It can be secured sufficiently. Further, the weight of the subframe 51 can be reduced.

Although preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the ideas described in the claims, and these also naturally belong to the technical scope of the present invention. It is understood as a thing.

For example, in the above embodiments, the shapes of the main frame 50 and the subframe 51 may be different. Further, the structure of the vehicle seat 1 may be other than that.

The present invention is useful in optimizing the transmission of the load generated from the seat belt in the backrest frame in a vehicle seat having a seat belt.

1 Vehicle seat 10 Seat 11 Backrest 20, 21 Shoulder 22,23 Reclining 30 Seatbelt 40 Backrest frame 50 Main frame 51 Subframe

Claims (5)

A vehicle seat with a seat belt
The backrest frame of the backrest is provided with a triangular frame-shaped main frame that connects one shoulder on which the seatbelt entrance / exit of the backrest is arranged and the reclining portions on both sides in the left-right direction as vertices. Vehicle seats. The vehicle seat according to claim 1, wherein the main frame has a pipe shape extending along the triangular frame shape. The backrest frame further includes a subframe extending from the one shoulder portion in the backrest portion, passing through the other shoulder portion, and extending to the reclining portion on the other shoulder portion side, claim 1 or The vehicle seat according to 2. The vehicle seat according to claim 3, wherein both ends of the subframe are connected to the main frame. The vehicle seat according to claim 3 or 4, wherein the width dimension in the direction perpendicular to the extension direction of the main frame is larger than the width dimension in the direction perpendicular to the extension direction of the subframe.