JP4136609B2 - Frame structure for vehicle seat - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a frame structure for an automobile seat, and more particularly to a cushion frame structure for a seat cushion for the purpose of sharing parts.
[0002]
[Prior art]
Conventionally, a cushion frame structure has been proposed in which a cushion frame is shared between a seat with a height mechanism that can adjust the height of the seat and a seat without a height mechanism, thereby reducing parts and cost.
[0003]
Normally, left and right seat cushion frames are symmetrically arranged on the seat, and a seat back frame is attached to a portion protruding above the rear end thereof so as to be tiltable and adjustable via reclining devices on both left and right sides.
In the case of a seat with a conventional height mechanism, the left and right seat cushion frames are attached to the upper rail of the slide rail via bolts or the like via the pivotable front and rear and left and right link pieces of the height mechanism, and the height mechanism interlocking pipe The left and right seat cushion frames are connected to each other.
[0004]
In the case of a seat that does not have a height mechanism, appropriate front and rear portions of the left and right seat cushion frames are directly attached to the upper rail of the slide rail with bolts or the like, and left and right by a connecting plate or the like (rear frame or the like). The seat cushion frame is connected. (For example, see Patent Document 1)
[0005]
[Patent Document 1]
Japanese Unexamined Patent Publication No. 2000-116459 (page 6, FIG. 1)
[0006]
[Problems to be solved by the invention]
The seat cushion frame of the seat provided with the above-described height mechanism is attached to the upper rail of the slide rail via a rotatable link piece. For this reason, even if a large impact load is input to the seat cushion frame from the seat back frame, reclining device, etc. when the vehicle is bumped from the rear, it is mitigated by the deflection of the link piece and the displacement of the rotation support shaft of the link piece. The seat cushion frame is not damaged so as to crack. However, if the seat cushion frame with a height mechanism is shared with a seat that does not have a height mechanism, the seat cushion frame is directly attached to the upper rail of the slide rail with bolts or the like. A large impact load is applied in the vicinity of the frame reclining device, which may cause breakage such as cracks.
This occurs because the strength of the cushion frame is set on the premise that a high-strength steel is used to reduce the weight of the cushion frame or that a height mechanism is provided.
[0007]
In order to eliminate such problems, if the seat cushion frame strength is set on the premise of a seat that does not have a height mechanism, the seat with the height mechanism becomes excessively strong and heavy, and the cost is high. Cause a malfunction. In addition, when a seat cushion frame based on a seat having a height mechanism is reinforced by welding a reinforcing member or the like and used in a seat without a height mechanism, there is a disadvantage in that the weight is increased.
[0008]
Therefore, the present invention makes it possible to share a seat cushion frame based on a seat having a height mechanism with a seat having no height mechanism by adding a simple and efficient reinforcing member, thereby preventing the occurrence of the crack. An object of the present invention is to provide a cushion frame structure for a lightweight seat cushion.
[0009]
[Means for Solving the Problems]
The present invention for achieving the above object includes a reclining device having left and right side frames and a connecting member for connecting the front and rear portions of both side frames, and projecting upward at the rear of the side frames. In the cushion frame in which the mounting portions are integrally formed, the front side of the both side frames is pivotally fixed to the upper rail, and a substantially triangular arm is disposed on the rear side, and the long side of the arm is the upper connecting portion is the side frames, also the lower connection point is the upper rail of the long sides, respectively, the arm, the upper rail, the side frame axis rotatably when a large load is inputted at the time of collision of the vehicle Further, the top of the short side is arranged at the rear part of the seat and is fixed to both side frames, and the long side of the arm is fixed to the both sides. The boundary portion substantially parallel to configurations of the present body portion and a mounting portion extending before and after the frame in which the features.
Further, in the above configuration, the frame structure of the vehicle seat has connecting means for connecting the left and right arms, and the left and right side frames are integrated with a moderate degree of freedom (twist absorption). It is characterized by the structure.
[0010]
With this configuration, when a large impact load is input to the side frame from the seat back side, the main body portion extending in the front and back of the side frame and the reclining device are arranged depending on the strength of the arm 3 itself and the arrangement of the arm 3 with respect to the side frame 10. Inconveniences such as cracks at the boundary with the mounting portion are avoided.
Even if impact loads of different sizes are input to the side frame mounting parts from the left and right seat back sides, the left and right side frames have a moderate degree of freedom (twist absorption) by connecting means such as connecting pipes and fixed pieces. Therefore, the cushion frame has high rigidity, and extreme left and right torsional deformation is prevented.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a frame structure of an automobile seat according to the present invention, and shows a configuration in which a seat cushion frame based on a seat having a height mechanism (not shown) is used for a seat having no height mechanism. . In FIG. 1, reference numeral 1 denotes a cushion frame, which includes left and right side frames 10, 10, a front frame 11 installed between the front portions of both side frames 10, 10, and the rear portions of both side frames 10, 10. And a rear frame 12 installed on the frame.
[0012]
Each of the illustrated frames 10, 11, and 12 is formed of a panel, and mounting portions 10 </ b> A and 10 </ b> A of a reclining device (not shown) projecting upward are provided at the rear of the frames 10 and 10. A reclining device is attached to the attachment portions 10A, 10A, and tilt adjustment of a seat back frame (not shown) is freely connected.
[0013]
As shown in FIGS. 2 and 3, the front portions of the side frames 10 and 10 are fixed to the upper rail 20 of the slide rail 2 with bolts 33, and a substantially triangular arm 3 is disposed inside the rear portion. At the same time, the connecting portion A at the upper part of the arm 3 is fixed to both side frames 10 and 10 by pins 32. Further, the connecting portion B below the arm 3 is connected to the upper rail 20 by a pin 31. All of the bolts 33 and the pins 31 and 32 are inserted in the horizontal direction with respect to the vertical side frame 10 and the upper rail 20.
[0014]
The upper rail 20 is fitted to a lower rail 21 fixed to the vehicle body so as to be slidable. Side frames 10 and 10 are attached to upper portions of the front and rear of the upper rail 20 by bolts 33 and pins 31. The mounting portions 20A and 20B are formed so as to project integrally.
[0015]
When a heavy load is input at the time of a vehicle collision, the arms 3, the upper rails 20, and the side frames 10 are slightly displaced (rotated) from each other with the pivotal portions of the pins 31, 32 as fulcrums. ) Is possible. Further, the pin 31 and the bolt 33 are set at substantially the same height.
[0016]
The arm 3 is formed in a substantially isosceles triangle, and the connecting point A located at the upper end of the long side extends from the connecting point B located at the lower end of the long side to the upper end of the attachment portion 10A of the side frame 10. The top portion C of the arm 3 is set at the rear portion of the seat. The top C portion of the arm 3 is fixed to the side frame 10 by bolts 41. That is, the long side of the arm 3 (the side connecting the connection point A and the connection point B) is a boundary portion X between the main body portion extending in the front and rear direction of the side frame 10 and the mounting portion 10A (if an excessive load is applied, a crack occurs. It is arranged almost in parallel with the easy part). Further, the arm 3 is pivotally attached and fixed to the side frame 10 at two locations of the pin 32 and the bolt 41, and is pivotally attached to the attachment portion B of the upper rail 20 by the pin 31.
[0017]
A substantially L-shaped fixed piece 40, 40 is fixed to the top C of the arm 3 by fastening a substantially central portion with a bolt 41, and a connecting pipe is connected to one end (lower end) of the fixed piece 40, 40. 4 is fixed by welding at both ends. Further, a stamping 42 is formed at the other end (upper end) of the fixed pieces 40, 40 and is fitted into a hole (not shown in the figure) provided in the arm 3, so that the fixed pieces 40, 40 are fixed to the arm 3. Is designed to prevent free rotation. The left and right side frames 10 and 10 are integrated with the connecting pipe 4 and the fixing pieces 40 and 40 with a moderate degree of freedom (twist absorption), and the rigidity of the entire cushion frame is improved. Have.
[0018]
In the seat of the cushion frame structure configured as described above, when a collision from the rear of the vehicle occurs, a large impact load is input to the mounting portions 10A and 10A of the side frames 10 and 10 from the seat back side. This load acts as a load in a direction in which the vicinity of the pin 32 and the bolt 41 is rotated backward as indicated by an arrow in FIG.
[0019]
When the arm 3 is not provided, this load is concentrated on the boundary portion X between the main body portion extending in the front and rear direction of the side frame 10 and the mounting portion 10A. However, in the cushion frame structure having the above configuration, this load is applied to the pin 32 and the bolt. It is transmitted to the arm 3 through the attachment portion 41 and distributed to the side frame 10 and the arm 3. That is, when a large impact load is input from the seat back side to the mounting portions 10A and 10A of the side frames 10 and 10, the front and rear sides of the side frame 10 extend depending on the strength of the arm 3 itself and the arrangement of the arm 3 with respect to the side frame 10. Inconveniences such as a crack in the boundary portion X between the main body portion and the attachment portion 10A are avoided.
[0020]
Even if the impact load sides having different sizes from the left and right seat back sides are input to the mounting portions 10A and 10A of the side frames 10 and 10, the left and right side frames 10 and 10 are connected by the connecting pipe 4 and the fixing pieces 40 and 40. Are integrated in a form having an appropriate degree of freedom (twist absorption), the cushion frame has high rigidity, and extreme left and right torsional deformation is prevented.
[0021]
【The invention's effect】
According to the present invention, a cushion frame (with different strength settings) premised on the provision of a height mechanism can be used in common with a cushion frame that does not have a height mechanism simply by adding a simple arm member and setting a connection point. can do.
Further, the rigidity of the entire cushion frame can be further improved by integrating the left and right arms in a form having an appropriate degree of freedom (twist absorption) by the connecting means including the connecting pipe 4 and the fixed piece. .
[Brief description of the drawings]
FIG. 1 is a perspective view showing a frame structure of an automotive cushion frame according to the present invention.
2 is a cross-sectional view taken along line II-II in FIG.
3 is a cross-sectional view taken along line III-III in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cushion frame 2 Slide rail 3 Arm 4 Connecting pipe 10 Side frame 11 Front seat 12 Rear frame 20 Upper rail 31, 32 Pin 33 Bolt

Claims (2)

A cushion frame having left and right side frames and connecting members for connecting the front and rear portions of both side frames, and a reclining device mounting portion protruding upward at the rear of the side frames. ,
The front side of both side frames is pivoted to the upper rail, and a substantially triangular arm is disposed on the rear side,
The upper connecting portion is the side frames of the long side of the arm, also in the lower coupling portion is said upper rail of the long side, respectively, the arm, upper rail when a large load upon collision of the vehicle is inputted, the side The frame is rotatably supported, and the top of the short side is arranged at the rear part of the seat and is fixed to both side frames,
Boundary portions substantially parallel to frame structure of a vehicle seat, characterized in arrangement of the present body portion and a mounting portion extending around the long sides the side frames of the arm.   The frame structure of a vehicle seat according to claim 1 has connecting means for connecting the left and right arms, and the left and right side frames are integrated in a form having an appropriate degree of freedom (twist absorption). A frame structure of a vehicle seat characterized by a configuration.

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