JP4096048B2 - Seat back frame structure - Google Patents

Description

  The present invention relates to a frame structure of a seat back in an automobile seat, and more particularly to a frame structure of a seat back having a loading platform on which a load is placed.

  In the conventional seat back, for example, as shown in JP-A-2000-106972, the seat back is divided in the vehicle width direction, and the vehicle width direction side of each seat back is directly swingably attached to the vehicle body There is. This is because each load is applied to each seatback when, for example, a load on the loading platform behind the seatback is subjected to a sudden impact load on the vehicle and collides with the back of the seatback due to its inertial force. The shock is absorbed by the car body.

JP 2000-106972 A

  By the way, in the case where the cargo bed surface is located at the upper part of the seat back, the seat back is divided into large and small parts in the vehicle width direction, and the reclining device is provided inside and outside each of the divided seat backs, When the load collides with the inner side due to the inertial force, the input load is larger on the inner side than on the outer side due to the attachment point to the vehicle body.

  In order to cope with this, it is necessary to match the strength of each reclining device with the inner reclining device. Therefore, there has been a problem that the strength of the outer reclining device becomes excessive.

  Therefore, the present invention allows the inner and outer reclining devices to be set to have the optimum strength by allowing the input load to be input equally to the inner and outer reclining devices of each divided seat back. The purpose is to.

The frame structure of the seat back according to the present invention for achieving the above object is divided into a large seat back part and a small seat back part by dividing the seat back into large and small parts in the vehicle width direction. Reinforcing members are arranged, and the inner reinforcing members of the seat backs are attached to the connecting shafts, and the outer reinforcing members are attached to the vehicle body with reclining devices. It is the structure which arrange | positions symmetrically with respect to the centerline of the width direction .

With the above configuration, the impact load is evenly input to the large and small seat back portions divided and formed on the left and right in the vehicle width direction. This is because the distance between the reinforcing members of each seat back part is equal and symmetrical to the center line of the seat back, and the maximum bending stress acting on the lower part of the frame of each seat back part is equalized by the impact load. It is.

  According to the present invention, the large seat back portion and the small seat back portion have the same distance between the reinforcing members to which the outer reclining devices are attached, and the reclining devices on the inner side and the outer side of each seat back portion are the seat backs. Because the reinforcement members are equidistant from the center line in the vehicle width direction and are provided symmetrically with respect to the center line in the vehicle width direction of the seat back portion due to the impact load. The bending stress acting on each seat back becomes equal.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows a frame structure of a seat back according to the present invention. As shown in FIG. 3, a seat back having this frame structure has a large seat back portion A having a wide width W1 in the vehicle width direction and a small width W2 having a small width W2. The seat back part B is comprised.

3, C is a seat cushion, and behind the large and small seat back portions A and B is a loading platform F on which loads E and D are placed. The height of the loading platform F is as shown in FIG. In addition, since the vehicle is located above the seat back portions A and B, the loads E and D collide with the upper back portions of the seat back portions A and B at the time of impact.

  The large frame 1 constituting the large seat back portion A and the small frame 2 constituting the small seat back portion B are respectively provided with back panels 10 and 20, reinforcing members 11, 11 ', 21, 21' provided in the vertical direction, The reinforcing members 11, 11 ′, 21 and 21 ′ are connected to upper members 13 and 23 and lower members 14 and 24.

  The reinforcing members 11 and 11 'of the large frame 1 and the reinforcing members 21 and 21' of the small frame 2 are arranged symmetrically with respect to the center line T that is the center in the vehicle width direction.

Accordingly, the distances W3 and W3 from the center line T to the reinforcing members 11 and 21 are the same, and the distances W4 and W4 from the center line T to the outer reinforcing members 11 'and 21' are also formed the same. .

  Each of the reinforcing members 11 and 21 includes a support 11A having a U-shaped cross section as shown in FIG. 2 and an absorption plate 11B welded in the support 11A.

  One side of the support 11A is welded to the back panel 10, and the upper end is welded to the upper member 13 made of the square pipe. Further, the absorbing plate 11B is formed in a corrugated shape so that the upper side of the support 11A swells forward from the direction of the back panel 10 so as to absorb the impact load in the arrow direction shown in FIG. Thus, the input to the reclining device R is reduced.

  The absorption plate 11B is welded together with the back panel 10 to the inner surface of the support 11A, and a lower member 14 made of a round pipe is welded to the lower part.

And the lowermost end of the inner side reinforcement members 11 and 21 is connected with the connection shaft 3 via the reclining devices R and R. The connecting shaft 3 uses a large-diameter pipe. This is because the load input to the seat at the time of impact increases because the loading platform F is high.

  On the other hand, the lowermost ends of the outer reinforcing members 11 'and 21' are connected to the vehicle body-side legs 30 and 30 via reclining devices R 'and R', and the connecting shaft 3 rotates when an impact load is input. However, the lock by the outer reclining devices R ′ and R ′ is not released.

  Further, the small frame with respect to the frame structure between the reinforcing members 11 and 11 'of the large frame 1 so that the load due to the collision of the loads D and E is equally input to the large and small seat back portions A and B. The frame structure on the two sides is formed with weak strength.

  That is, as shown in the figure, the frame structure on the small frame 2 side of the large frame 1 connects the back frame 10 with a subframe 17 in which a thin pipe is bent in a substantially U shape and both free ends of the subframe 17 The connecting pipe 16 and the supporting rods 18 and 19 welded to both ends of the connecting pipe 16 and the sub-side frame 11A disposed on the reinforcing member 11 side of the sub-frame 17 are configured.

Therefore, according to the present invention, as described above , when the luggage D and E collide with the large and small seat back portions A and B, the collision is equally applied to the reinforcing members of the frame structure constituting the large frame 1 and the small frame 2. It is configured to input the load of time.

  Therefore, both the inner and outer reclining devices R and R ′ can be set to have optimum strength.

  Moreover, since the reclining devices R and R inside the large and small frames 1 and 2 are attached to the connecting shaft 3 and the outside of the large and small frames 1 and 2 are attached to the vehicle body side, the impact load is large and small. There is no intensive input to the inside of the frames 1 and 2.

  It should be noted that the present invention is not limited to the illustrated example as long as the reinforcing members are uniformly arranged symmetrically with respect to the center line T in the vehicle width direction.

It is a top view of the principal part of this invention. It is the II-II sectional view taken on the line of FIG. 1 is a perspective view of a vehicle seat that employs the present invention. It is the same side view.

Explanation of symbols

A ... Large seat back part, B ... Small seat back part, 11 ... Inner reinforcing member, 21 ... Inner reinforcing member, 11 '... Outer reinforcing member, 21' ... Outer reinforcing member , R ... Recliner device , R '... Reclining device

Claims (3)

The seat back is divided into large and small parts in the vehicle width direction to make a large seat back part and a small seat back part , reinforcing members are arranged on the left and right of each seat back, and the reinforcing members inside each seat back are connected to the connecting shaft In addition, the outer reinforcement members are attached to the vehicle body with reclining devices, and the left and right reinforcement members of each seat back portion are arranged symmetrically with respect to the center line in the vehicle width direction of the seat back. Frame structure.   2. The frame structure of a seat back according to claim 1, wherein the reinforcing member includes a support having a U-shaped cross section welded to the front surface of the back panel, and an absorption plate having an uneven shape in the front-rear direction welded in the support.   2. The seat back frame according to claim 1, wherein the large seat back portion is formed by forming an outer frame structure on the small seat back side with respect to the reinforcing member with a lower strength than the inner frame structure. Construction.

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