JP4477558B2 - Sheet - Google Patents

Description

  The present invention relates to a seat having a seat cushion for supporting a seated person's buttocks and a seat back for supporting the back of the seated person.

  A conventional vehicle seat will be described with reference to FIG. In the figure, the seat 1 comprises a seat cushion 11 that supports the seated person's buttocks and a seat back 13 that supports the seated person's back. The front side of the lower arm 3 that is the frame of the seat cushion 11 and the floor F side are attached to a bracket 18 provided on the floor F side using one pin 15. The rear side of the lower arm 3 and the floor F side are attached to a bracket 19 provided on the floor F side using two pins 17.

  The lower arm 3 is provided with an upper frame 7 which is a frame of the seat back 13 around the hinge pin 5 so as to be rotatable. A reclining mechanism 9 that prohibits / permits rotation of the upper frame 7 is provided between the lower arm 3 and the upper frame 7.

  When an occupant is seated on such a vehicle seat and is collided with another vehicle or the like from the rear of the vehicle (hereinafter referred to as a rear collision), the impact is received by the seat back 13 of the seat. At this time, an impact in the direction of arrow W in FIG. 6 is applied to the seat back 13, and a bending moment in the direction of arrow BM acts on the lower arm 3.

  When the impact is large, the lower arm 3 is deformed to absorb the impact energy. However, in the vehicle seat having the above-described configuration, since the lower arm 3 is set to have substantially the same strength throughout, the location and direction of deformation of the lower arm are not constant at the time of rearward collision of the vehicle.

  Therefore, as shown in FIG. 7 and FIG. 8, the bending formed between the hinge pin 5 that is the rotation shaft of the reclining mechanism 9 and the bracket 19 so as to protrude to either the outer side or the inner side of the lower arm 3. A sheet provided with an offset portion 21 has been proposed. 7 is an enlarged view of the lower arm, and FIG. 8 is a view in the direction of arrow B in FIG.

According to such a structure, the bending offset part 21 becomes a weak part with weak intensity | strength compared with another part. Therefore, at the time of rearward collision of the vehicle, first, in FIG. 7, the ridgeline of the bending offset portion 21 is further deformed so as to protrude further to either the outside or the inside of the lower arm 3, and the location and direction of deformation of the lower arm 3. Is constant (see, for example, Patent Document 1).
JP 2003-335162 A (paragraph number 0015-paragraph number 0022, FIGS. 1-6)

  However, in the seat having the configuration shown in FIG. 7, when the vehicle collides rearward, when the lower arm 3 is viewed from the side, the peripheral edge of the bent offset portion 21 at the rear of the lower arm 3 is in the H direction (the seatable upper frame 7 Shrink from the lower part (rotation center) to the upper part (rotation end part) in a direction substantially along the direction of the line segment. Then, the upper frame 7 rotates around the point O of the bending offset portion 21, and the upper frame 7 largely falls backward.

If the tilt angle of the upper frame 7 to the rear is large at the time of rearward collision of the vehicle, there is a problem that it becomes difficult to restrain the seated person.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a seat in which a tilt angle of the seat back frame to the rear is reduced at the time of a rear collision.

The invention according to claim 1, which solves the above problem, is a seat having a seat cushion that supports the buttocks of the seated person and a seat back that supports the back of the seated person, and the front side of the frame of the seat cushion and the floor And the rear side of the frame and the floor side are rotatably mounted using a second pin, the first pin of the frame, A lower fragile portion is provided between the two pins below a straight line connecting the first pin and the second pin to cause the frame to be deformed by compression, and the first pin of the frame , the portion above than the first pin and the straight line connecting the second pin between the second pin, the lower weak portion and the interval upper weak portion that triggers the said frame is deformed by a tension A sheet characterized by providing with.

  The front side of the seat cushion frame and the floor side are rotatably attached using a first pin, and the rear side of the frame and the floor side are rotatably attached using a second pin. Therefore, when the vehicle collides rearward, a compressive force is applied to a portion below the straight line connecting the first pin and the second pin between the first pin and the second pin of the frame. In addition, a tensile force is applied to a portion above the straight line connecting the first pin and the second pin between the first pin and the second pin of the frame.

  By applying a compressive force between the first pin and the second pin of the frame below the straight line connecting the first pin and the second pin, the frame of the seat cushion is weakened at the bottom. Deformation starts from the part. In addition, a tensile force is applied to a portion above the straight line connecting the first pin and the second pin between the first pin and the second pin of the frame, whereby the frame of the seat cushion is Deformation starts from the upper weak part.

And it deform | transforms so that the lower part may open outside from the straight line which tied the 1st pin and 2nd pin of the flame | frame of a seat cushion, and the impact force of a rear collision is absorbed.
At this time, due to the deformation of the frame of the seat cushion, the frame of the seat back falls backward about a point on a straight line passing through the lower fragile portion and the upper fragile portion.

The invention according to claim 2 is the sheet according to claim 1, wherein the lower fragile portion and the upper fragile portion are formed on the first pin side.
The invention according to claim 3 is the sheet according to claim 1, wherein the lower fragile portion and the upper fragile portion are formed on the second pin side.

According to the first to third aspects of the present invention, the front side and the floor side of the frame of the seat cushion are rotatably attached using the first pins, and the rear side and the floor side of the frame are attached. Is rotatably mounted using a second pin, and is disposed between the first pin and the second pin of the frame below a straight line connecting the first pin and the second pin. A portion above the straight line connecting the first pin and the second pin between the first pin and the second pin of the frame. sheet, said frame further the upper weak portion that trigger deformed is provided with the lower weak portion and the interval, if a rear-end collision, about a point on the straight line passing through the lower weak portion and the upper weak portion by pulling Back frame Fall backwards.

  In the conventional seat, the center of rotation of the seat back frame in the case of a rear collision is between the reclining mechanism and the second pin. On the other hand, in the seat of the present invention, the center of rotation of the seatback frame in the case of a rear collision is between a point on a straight line passing through the lower fragile portion and the upper fragile portion, that is, between the first pin and the second pin. is there. Therefore, the rotation radius of the seat back frame of the seat of the present invention is longer than the rotation radius of the conventional seat back frame of the seat, and the tilt angle to the rear of the frame of the seat back is reduced at the time of rear impact.

  Further, in the conventional seat, the deformation part of the seat cushion frame is the rear part of the seat cushion frame, and the deformation is a direction substantially along the direction of the line segment connecting the lower part to the upper part of the seat back frame in the seatable state. It was a deformation that shrunk. Accordingly, when the frame of the seat cushion is deformed, the seat back is greatly tilted backward.

  However, in the present application, the deformation portion of the seat cushion frame is below the straight line connecting the first pin and the second pin of the seat cushion frame, and the deformation is a deformation in which the frame of the seat cushion opens outward. . Therefore, even if the frame of the seat cushion is deformed, the tilt angle toward the rear of the seat back is reduced.

  According to the second aspect of the present invention, since the lower fragile portion and the upper fragile portion are formed on the first pin side, the center of rotation of the frame of the seat back is on the first pin side, that is, the seat. It becomes the front side of the cushion frame, and the radius of rotation of the seat back becomes longer, and the angle of tilting the seat back toward the rear of the frame becomes smaller at the time of rear collision.

  First, the overall configuration of the sheet according to the embodiment will be described with reference to FIG. In the figure, a seat 99 includes a seat cushion 100 that supports a seated person's buttocks and a seat back 102 that supports the seated person's back. An upper frame 103 that is a frame of the seat back 102 is attached to an upper portion of the lower arm 101 that is a frame of the seat cushion 100 via a reclining mechanism 104.

  The reclining mechanism 104 prohibits rotation of the first member fixed to the lower arm 101 side, the second member rotatably attached to the first member and attached to the upper frame 103 side, and the second member. / This is a normal mechanism composed of locking means to be permitted, and detailed description thereof will be omitted.

  Furthermore, the seat 99 of this embodiment can be moved in the front-rear direction of the vehicle by the seat track device 91. The seat track device 91 includes a lower rail 95 provided on the floor side, an upper rail 93 movably engaged with the lower rail 95, and a lock unit (not shown) that prohibits the movement of the upper rail 93. The front side of the lower arm 101 of the seat 99 is attached to the upper rail 93 via the bracket 111, and the rear side of the lower arm 101 is attached to the upper rail 93 via the bracket 113.

The bracket 111 is attached to the upper rail 93 using two pins 115 and attached to the lower arm 101 using one pin 117.
The bracket 113 is attached to the upper rail 93 using two pins 119 and is attached to the lower arm 101 using one pin 121.

  Accordingly, the front side and the floor side of the lower arm 101 that is the frame of the seat cushion 100 are rotatably attached using the pin (first pin) 117, and the rear side and the floor side of the lower arm 101 are connected to the pin (first pin). (2 pins) 121 and is rotatably attached.

2 is a perspective view of the rear part of the lower arm 101 of FIG. 1, FIG. 3 is a view taken in the direction of the arrow Y in FIG. 2, FIG. 4 is an enlarged view of the lower arm 101 of FIG. 1, and each part of the lower arm of FIG. The lower arm 101 will be described with reference to FIG. The lower arm 101 is formed with a flange, a bead and the like in order to increase rigidity. In the present embodiment, the following configuration is provided between the pin 121 and the pin 117 and at the rear portion of the lower arm 101.
(1) At the upper part of the lower arm 101, a flange portion 151 formed by bending in a direction substantially parallel to the floor is formed. Then, between the pin 121 and the pin 117, and at the rear portion of the lower arm 101, a changing portion 151a in which the width of the flange portion 151 is gradually narrowed from W to w is formed.
(2) A flange portion 161 formed by being bent in a direction substantially parallel to the floor is also formed at the lower portion of the lower arm 101. Further, between the pin 121 and the pin 117 and at the rear portion of the lower arm 101, a change-over portion 161a in which the width of the flange portion 161 gradually narrows from W to w is formed.
(3) A recess 153 is formed between the pin 121 and the pin 117 and at the rear of the lower arm 101 so as to protrude from the reference surface S to the inside of the sheet.
(4) A first bead portion 155 and a second bead portion 157 projecting from the reference surface S to the outside of the sheet are formed between the pin 121 and the pin 117 and at the rear portion of the lower arm 101. On the 1st bead part 155, the 1 'bead part 155a which protrudes on the outer side of a sheet | seat is further formed.

A portion where the rigidity changes, a terminal end of the removal portion, and the like become a weak portion. Accordingly, the following weak portion is formed between the pin 121 and the pin 117 and at the rear portion of the lower arm 101.
(1) A wall surface 153a portion of the recess 153 that serves as a boundary between the recess 153 and the reference surface S (first fragile portion 201)
(2) Terminal portion of second bead portion 157 (second fragile portion 202)
(3) The end point portion where the width of the flange portion 151 becomes narrower in the change-over portion 151a of the flange portion 151 (third fragile portion 203)
(4) A wall surface 155b portion (fourth fragile portion 204) of the first 'bead portion 155a serving as a boundary between the first bead portion 155 and the first' bead portion 155a.
(5) The end point portion where the width of the flange portion 161 becomes narrower in the changeover portion 161a of the flange portion 161 (the fifth fragile portion 205).
Of the first fragile portion 201 to the fifth fragile portion 205, the fifth fragile portion 205 is in a portion below the straight line connecting the pin 121 and the pin 117 and becomes a lower fragile portion. The 1st weak part 201-the 4th weak part 204 are in the part above the straight line which connected the pin 121 and the pin 117, and become an upper weak part.

  The first fragile portion 201 and the second fragile portion 202 are on the same straight line L1, and the third fragile portion 203, the fourth fragile portion 204, and the fifth fragile portion 205 are on the same straight line L2. The straight line L1 and the straight line L2 intersect on the lower arm 101.

  When a vehicle having the seat 99 configured as described above collides, a force in the W direction in FIG. 1 acts on the seat back 102. The front side and the floor side of the lower arm 101 which is a frame of the seat cushion 100 are rotatably attached using a pin (first pin) 117, and the rear side and the floor side of the lower arm 101 are connected to a pin (second pin). Pin) 121 is rotatably attached. Therefore, a compressive force is applied between the pin 117 of the lower arm 101 and the pin 121 below the straight line connecting the pin 117 and the pin 121. Further, a tensile force is applied to a portion above the straight line connecting the pin 117 and the pin 121 between the pin 117 and the pin 121 of the lower arm 101.

  A compression force is applied to a portion below the straight line connecting the pin 117 and the pin 121 between the pin 117 and the pin 121 of the lower arm 101, whereby the lower arm 101 of the seat cushion is a fifth weak portion. Deformation starts from the fragile portion 205. Further, when a tensile force is applied to a portion above the straight line connecting the pin 117 and the pin 121 between the pin 117 and the pin 121 of the lower arm 101, the lower arm 101 of the seat cushion is the upper fragile portion. The deformation starts from the first weak part 201, the second weak part 202, the third weak part 203, and the fourth weak part 204.

Then, the lower part of the lower arm 101 of the seat cushion is deformed so as to open outward, and the impact force of the rear impact is absorbed.
At this time, due to the deformation of the lower arm 101 of the seat cushion 100, the upper frame 103, which is the frame of the seat back 102, falls backward about the point on the straight line L2 passing through the lower fragile portion and the upper fragile portion.

  According to such a configuration, in the conventional seat shown in FIG. 7, the center of rotation of the frame of the seat back in the case of a rear collision is between the reclining mechanism and the second pin. On the other hand, in the seat 99 of this embodiment, the center of rotation of the upper frame 103 of the seat back 102 that tends to fall backward in the case of a rear collision is a point on the straight line L2 passing through the lower fragile portion and the upper fragile portion, that is, , Between pin 117 and pin 121. Therefore, the rotational radius of the upper frame 103 of the seat back 102 of the seat 99 of the present embodiment is longer than the rotational radius of the frame of the seat back of the conventional seat, and the rearward of the upper frame 103 of the seat back 102 at the time of a rear collision. The falling angle becomes smaller.

  In addition, in the conventional seat, the deformation part of the seat cushion frame is the rear part of the frame, and the deformation contracts in a direction substantially along the line segment connecting the lower part of the seat back frame to the upper part of the seatable state. It was a deformation. Accordingly, when the frame of the seat cushion is deformed, the seat back is greatly tilted backward.

  However, in this embodiment, the deformation portion of the lower frame 101 of the seat cushion 100 is below the straight line connecting the pins 117 and 121 of the lower frame 101, and the deformation is a deformation in which the lower frame 101 opens outward. . Therefore, even if the lower frame 101 of the seat cushion 100 is deformed, the backward tilt angle of the upper frame 103 of the seat back 102 is reduced.

  In addition, this invention is not limited to the said example of a form. In the above embodiment, the fragile portion is formed on the pin 121 side of the lower arm 101, that is, the rear portion of the lower arm 101, but may be formed on the pin 117 side of the lower arm 101, that is, the front portion of the lower arm 101. In this case, the center of rotation of the upper frame 103 of the seat back 102 is on the pin 117 side, and further, the radius of rotation of the seat back 102 is increased, and the tilt angle of the seat back 102 to the rear of the upper frame 103 is reduced during a rear impact. .

It is a figure explaining the whole structure of the sheet | seat of the embodiment. It is a perspective view of the rear part of the lower arm of FIG. FIG. 3 is a view in the Y direction of FIG. 2. It is an enlarged view of the lower arm of FIG. It is a figure which shows the cross-sectional shape of each part of the lower arm of FIG. It is a figure which shows the conventional vehicle seat. In the conventional vehicle seat, it is an enlarged view of the lower arm where the deformation location and the deformation direction at the time of rear collision are constant. It is a B direction arrow directional view of FIG.

Explanation of symbols

101 Lower arm (frame)
117 pin (first pin)
121 pin (second pin)
201 1st vulnerable part (upper vulnerable part)
202 2nd vulnerable part (upper vulnerable part)
203 3rd vulnerable part (upper vulnerable part)
204 4th vulnerable part (upper vulnerable part)
205 5th vulnerable part (lower vulnerable part)

Claims (3)

In a seat having a seat cushion for supporting a seated person's buttocks and a seat back for supporting a seated person's back,
The front side and the floor side of the frame of the seat cushion are rotatably attached using a first pin,
The rear side of the frame and the floor side are rotatably attached using a second pin,
A lower fragile portion between the first pin and the second pin of the frame, below the straight line connecting the first pin and the second pin, that causes the frame to be deformed by compression. Provided,
The first pin of the frame, the said first pin and the portion above the straight line connecting the second pin between the second pin, the upper weak portion that trigger the frame by the tension deforms A sheet characterized by being provided at a distance from the lower fragile portion .   The sheet according to claim 1, wherein the lower fragile portion and the upper fragile portion are formed on the first pin side.   The sheet according to claim 1, wherein the lower fragile portion and the upper fragile portion are formed on the second pin side.

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