JP4101617B2 - Seat frame structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a frame structure of a seat cushion in an automobile seat.
[0002]
[Prior art]
Some side frames constituting a seat cushion of a conventional automobile seat are directly fastened to a vertical wall portion of an upper rail of a slide rail attached to the vehicle floor side (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Unexamined Patent Publication No. 2000-116459 (FIG. 1).
[0004]
Accordingly, the vertical wall portion of the upper rail is superimposed on the inside or outside of the vertical side frame, and bolts and rivets are inserted laterally and fastened together.
[0005]
[Problems to be solved by the invention]
In this way, the one that fastens the vertical side frame to the vertical wall portion of the upper rail can use the cushion frame provided with the lifter, so that there is an advantage that the cushion frame with the lifter and the cushion frame without the lifter can be shared. .
[0006]
On the other hand, in order to reduce the weight of the frame, it is desirable to form the frame with a high-tensile steel plate.
However, when the vertical side frame made of a high-strength steel plate is fastened to the vertical wall portion of the upper rail of the slide rail with a fastening member in the horizontal direction for the common use, the side frame cracks due to a large load applied to the seat. There was a bug.
[0007]
Therefore, in the present invention, a side frame is formed in a vertical shape so that a frame made of a high-strength steel plate can be shared with a frame with a lifter and a frame without a lifter, and an upper rail or the like is formed on the side frame. An object of the present invention is to solve the above-mentioned problems in a structure in which the vertical wall portions of the base member are overlapped on the left and right and fastened integrally in the lateral direction.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention connects a pair of left and right side frames of a cushion frame and a pair of left and right base members attached to the vehicle floor side with a pair of left and right front arms and a rear arm, respectively, The rear arm and the side frame are connected by a connecting pin, the left and right rear arms are integrally connected by a cross shaft, and both ends of the cross shaft are rotatably inserted into the side frame.
[0009]
With the above configuration, the left and right rear arms are integrally fixed by the cross shaft, so that the lateral rigidity on the base member side is improved.
In addition, since the side frames are connected to the front and rear arms with connecting pins and are not fixed, distortion due to forced assembly does not occur.
In addition, the occurrence of cracks in the side frame due to a large load from the seat back side can be prevented by the cross shaft and the front and rear arms.
[0010]
One connecting pin that connects the left and right rear arms and the side frame is pivotally attached to the rear arm or the side frame, and the other connecting pin integrally connects the rear arm and the side frame. By fastening, one of the connecting pins does not need to be fixed by welding or the like, so that the assembling property of the side frame is improved.
[0011]
Furthermore, the left and right front arms have a fragile structure that deforms when a large load is applied to the rear, and the side frame when a large load is applied to the connecting portion that connects the rear arm and the side frame. By providing an energy absorbing portion that allows the rearward movement of the seat, the seat moves rearward and absorbs the energy when a large load is applied rearward in the event of a collision or the like.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 and 2 show a seat frame structure according to the present invention, which is composed of a cushion frame 1, a base member 2, a pair of left and right front arms 3 and a rear arm 4 constituting a seat cushion.
[0013]
The cushion frame 1 includes a pair of left and right side frames 10 and 10, a front frame 11 that integrally connects the front portions of the left and right side frames 10 and 10, and a rear frame that is integrally connected between the rear portions of the side frames 10 and 10. It consists of and.
[0014]
This cushion frame is used for a seat on which a lifter is provided. In order to reduce the weight, the cushion frame is formed of a high-strength steel plate, and the side frames 10 and 10 have plate members arranged vertically. Then, as shown in FIGS. 3 and 4, a flange is provided around the periphery for reinforcement.
[0015]
The base member shown in the figure has a conventionally known structure in which a lower rail 21 is fastened to a vehicle floor side by a pair of left and right slide rails 2 provided on the vehicle floor side, and an upper rail 20 is slidably fitted to the lower rail 21. is there.
[0016]
The front arm 3 and the rear arm 4 are connected between the vertical upper portion of the pair of left and right upper rails 20 and the side frames 10 and 10.
[0017]
The front arm 3 and the rear arm 4 are respectively fixed to the upper part of the upper rail 20 at two locations. In the figure, 32, 33, 43 and 44 indicate fastening members such as fixing bolts and rivets, respectively.
[0018]
The front arm 3 is pivotally attached to the side frame 10 by bolts, rivets 31 and the like so as to be integrally fixed or rotatable.
The front arm 3 is provided with a bead 30 to reinforce the strength in the vertical direction.
[0019]
However, the front arm 3 has a fragile structure that deforms when a large load is applied to the rear. That is, the rear end edge is provided with a sudden change portion A ₂ whose shape has suddenly changed as shown in FIGS. 1 and ₂ , or a notch portion A ₁ as shown in FIG. 7, and a large rear load is applied to the front arm 3. When acted, the front arm 3 is formed so as to be bent in a square shape inward from the X portion shown in FIG. 2 and the A portion shown in FIG. 7 to absorb the load.
[0020]
In addition, in FIG. 7, 31A, 32A, 33A in the figure shows the insertion hole of a fastening member.
[0021]
Upper portions of the left and right rear arms 4 and 4 are integrally welded to the cross shaft 5. However, as shown in FIG. 4, both end portions 41 of the cross shaft 5 projecting outward from the rear arms 4 and 4 are rotatably inserted into the side frames 10 and 10.
[0022]
Further, as shown in FIG. 5, one of the upper portions of the rear arms 4 and 4 is caulked by a connecting pin 42, while the other connecting pin 42 'is pivotable without being caulked. Are linked.
[0023]
As shown in FIG. 6, the connecting portion of the rear arms 4, 4 to the side frame 10 has an energy absorbing portion Y that allows the side frames 10, 10 to move backward when a large load is applied to the rear. Provided.
[0024]
The illustrated energy absorbing portion Y has a through hole 101 and a through hole 102 formed in the side frame 10 in the front-rear direction so that both ends 41 of the cross shaft 5 and the connecting pins 42 and 42 ′ can be moved by the load. A communication portion 103 having a narrow width with respect to the diameter of the through holes 101 and 102 is provided between the two through holes 101 and 102.
Accordingly, both ends 41 and the connecting pins 42 and 42 ′ inserted through the rear through hole 101 by the load move in the direction of the arrow in FIG. 7 through the communication portion 103, and the load is absorbed when passing through the communication portion 103. To do.
[0025]
In addition, this energy absorption part Y may provide the cushioning member, such as a rubber material, in the both ends 41 of the cross shaft 5 of the part inserted in the side frame 10, and the connection pins 42 and 42 '.
[0026]
In the figure, reference numeral 10A denotes a reclining device mounting portion provided on the side frames 10 and 10, and a reclining (not shown) is mounted on the reclining mounting portion 10A so that the back frame constituting the seat back is tiltably mounted.
[0027]
The connecting pins 42 and 42 ′ and both end portions 41 and 41 of the cross shaft 5 can rotate when the excessive load is input from the seat back side to the side frames 10 and 10, and can disperse the load. As installed.
[0028]
【The invention's effect】
According to the first aspect of the present invention, since the cross shaft is fixed to the left and right rear arms, the lateral rigidity on the base member side is improved. In addition, since the cross shaft is inserted through the left and right side frames, it is possible to impart support strength in the front-rear and up-down directions to the side frames.
In addition, since the cross shaft is fixed to the rear arm inside the left and right side frames, it serves as a transmission element for a side impact load from the vehicle body side, and can effectively cope with a side impact of the vehicle.
[0029]
In addition , since one of the connecting pins is pivotally mounted, the assembly of the side frame is improved. Further, since distortion due to forced assembly such as welding does not occur, the synchronism is not impaired when the base member is a pair of left and right slide rails.
[0030]
Furthermore, since the rearward movement of the side frame is allowed with respect to the rear load generated at the time of the collision of the vehicle and the energy of the rear load can be effectively absorbed, the load on the occupant can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view of a frame structure of a seat according to the present invention.
2 is a cross-sectional view taken along line II-II in FIG.
3 is a partial sectional view taken along line III-III in FIG.
4 is a partial cross-sectional view taken along line IV-IV in FIG.
FIG. 5 is a cross-sectional view taken along line V-V in FIG. 2;
FIG. 6 is a front view showing an energy absorbing unit.
FIG. 7 is a perspective view of a front arm.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cushion frame 2 Base member 3 Front arm 4 Rear arm 5 Cross shaft 10 Side frame 41 Both ends 42 of cross shaft Connection pin 42 'Connection pin

Claims (1)

A pair of left and right side frames of the cushion frame and a pair of left and right base members attached to the vehicle floor side are connected by a pair of left and right front arms and a rear arm, respectively, and the front and rear arms and the side frame are connected by a connecting pin. The left and right rear arms are integrally connected by a cross shaft, and both ends of the cross shaft are rotatably inserted into the side frame to connect the left and right rear arms to the side frame. The pin is pivotally attached to the rear arm or the side frame, the other connecting pin fastens the rear arm and the side frame together, and the left and right front arms are subjected to a large load in the rear. The fragile structure is deformed when the rear frame is moved, and the side frame moves backward when a large load is applied to the connecting portion that connects the rear arm and the side frame. Frame structure formed by providing an acceptable energy absorber sheet.

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