JP5577204B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat having a function of transmitting an impact load input from the side of a vehicle to an inner region in the width direction of the vehicle body.

  A device that transmits an impact load input from the side of a vehicle at the time of a collision or the like to the inner side in the width direction of the vehicle body via a seat is known (for example, see Patent Document 1).

In this vehicle seat, the seat back frame is formed in a rectangular frame shape, protrudes outward in the seat width direction to the side frame portion on the outer side in the vehicle width direction, and is input from a center pillar or the like on the side portion of the vehicle body. Is attached to the seat back frame. In addition, the lower sides of the left and right side frame portions of the seat back frame are connected to each other by a lower frame portion extending in the vehicle width direction, and extends downward from the lower frame portion of the side frame portion. The end is connected to the rear end portion of the cushion frame via a tilt shaft so that the tilt can be adjusted.
Therefore, in this vehicle seat, when the vehicle body side portion is deformed by the input of an impact load, the vehicle body side portion abuts on the load transmission block, and the impact load is applied to the side frame portion and the lower frame portion on the outer side in the vehicle width direction. Thus, it is efficiently transmitted to the inside in the width direction of the vehicle body.

JP 2000-103275 A

However, in this conventional vehicle seat, the extension end below the side frame portion of the seat back frame is connected to the rear end portion of the cushion frame via the tilting shaft. In order to avoid interference with the tilting shaft, the lower frame portion, which is the main load transmission path on the lower side of the back frame, must be spaced apart from the lower end position of the seat back frame.
And especially when trying to incorporate a drive motor for adjusting the inclination angle of the seat back frame in the lower region of the seat back, in order to avoid the lower frame portion from interfering with the drive motor. In this case, the lower frame part must be spaced further upward.
For this reason, in the case of the conventional vehicle seat, the impact load input to the side frame portion on the outer side in the vehicle width direction cannot be efficiently transmitted to the inner side in the vehicle width direction at a sufficiently low height of the seat back frame.

  Accordingly, the present invention efficiently incorporates a drive motor for adjusting the inclination angle of the seat back frame in the lower region of the seat back frame, and efficiently transmits the impact load in the vehicle width direction in the lower region of the seat back frame. An object of the present invention is to provide a vehicle seat that can be used.

The vehicle seat according to the present invention employs the following means in order to solve the above problems.
According to the first aspect of the present invention, a pair of side frame portions (for example, the side frame portions 13c and 13d in the embodiment) on the outer side and the inner side in the vehicle width direction that are spaced apart in the seat width direction, and the both side portions A seat back frame (for example, the seat back frame 13 of the embodiment) having a lower frame portion (for example, the lower frame portion 13b of the embodiment) extending in the seat width direction between the lower regions of the frame portion, and the vehicle A load transmission block (for example, the first load transmission block 18 of the embodiment) that is installed on the outer surface of the side frame portion on the outer side in the width direction and transmits the impact load input from the vehicle body side portion to the seat back frame. ), A space (for example, implementation) between an end portion on the inner side in the vehicle width direction of the lower frame portion and a side frame portion on the inner side in the vehicle width direction. And a drive motor (for example, the drive motor 30 of the embodiment) for adjusting the inclination angle of the seat back frame is disposed in the separate space, and outside the drive motor. detour to the lower frame portion and the vehicle width direction inner side of the side frame portion for coupling the plate-like strength member (e.g., rear under plate 24 in the embodiment) is provided on the rear side of the lower frame portion A plate-shaped reinforcing member (for example, the front under plate 25 of the embodiment) is disposed on the front side of the lower frame portion, and the side portion on the outer side in the vehicle width direction is formed by the plate-shaped strength member and the plate-shaped reinforcing member. The frame portion and the lower end portions of the side frame portion on the inner side in the vehicle width direction are connected to each other .
As a result, the drive motor is arranged in a space provided between the lower frame portion and the side frame portion on the inner side in the vehicle width direction, and the plate-like strength member avoids the drive motor to avoid the lower frame portion and the inner side in the vehicle width direction. The side frame portions of the two are connected.

According to a second aspect of the present invention, in the vehicle seat according to the first aspect, the plate-like strength member extends from the lower frame portion to a height at which the plate-like strength member wraps around the lower side of the drive motor. An end portion on the inner side in the direction is coupled to a circular arc surface at a lower end of the side frame portion on the inner side in the vehicle width direction over a height region lower than the drive motor, and the plate-like reinforcing member includes the seat A notch part (for example, the notch part 31 of the embodiment) in which a region extending upward from the front surface of the tilt axis of the back frame is notched is provided.

  According to the first aspect of the present invention, the separation space is provided between the lower frame portion and the side frame portion on the inner side in the vehicle width direction, and the drive motor for adjusting the inclination angle of the seat back frame is disposed in the separation space. In addition, since the plate-like strength member bypasses the outside of the drive motor and connects the lower frame portion and the side frame portion on the inner side in the vehicle width direction, the drive motor is compactly incorporated in the lower region of the seat back frame. The impact load can be efficiently transmitted to the inside in the vehicle width direction in the lower region of the seat back frame.

  According to the second aspect of the present invention, the plate-like strength member extends from the lower frame portion to a height around the lower side of the drive motor, and the end of the plate-like strength member on the inner side in the vehicle width direction is lower than the drive motor. Since it is coupled to the side frame portion on the inner side in the vehicle width direction over the region, the impact load can be efficiently transmitted to a sufficiently low position of the side frame portion on the inner side in the vehicle width direction.

It is the perspective view which looked at the frame part of the vehicular seat of one embodiment of this invention from the front side. It is the perspective view which looked at the frame part of the vehicular seat of one embodiment of this invention from the back side. It is the perspective view which looked at the A section of Drawing 1 of the vehicle seat of one embodiment of this invention from the E direction. It is a disassembled perspective view of the A section of FIG. 1 of the vehicle seat of one embodiment of the present invention. It is sectional drawing corresponding to CC cross section of FIG. 3 of the vehicle seat of one Embodiment of this invention. It is an expansion perspective view of the site | part corresponding to the B section of FIG. 1 of the vehicle seat of one Embodiment of this invention. It is sectional drawing corresponding to the DD cross section of FIG. 6 of the vehicle seat of one Embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, the arrow F indicates the front of the vehicle.
FIG. 1 is a perspective view of a skeleton portion of a vehicle seat 1 arranged on the left side of the front seat of the vehicle as viewed obliquely from the upper front side, and FIG. 2 is an oblique view of the skeleton portion of the vehicle seat 1 on the rear side. It is the perspective view seen from the upper part.
The vehicle seat 1 includes a seat cushion 2 that supports the occupant's buttocks, a seat back 3 that is connected to the rear end of the seat cushion 2 and supports the waist and back of the occupant, and an upper portion of the seat back 3. A headrest (not shown) that is supported and supports the head and neck of the occupant is provided.

  The seat cushion 2 includes a cushion frame 7 formed in a rectangular frame shape by front and rear pipe members 5A and 5B and side plate members 6A and 6B. 9 is attached to be slidable back and forth.

  The seat back 3 includes a substantially rectangular frame-shaped seat back frame 13 including an upper frame portion 13a, left and right side frame portions 13c and 13d, and a lower frame portion 13b. The upper frame portion 13a and the lower frame portion 13b are formed of a pipe material extending in the vehicle width direction, and the left and right side frame portions 13c and 13d are side portions that are plate materials having a substantially U-shaped cross section outside the pipe material. The plates 14a and 14b are joined. The pipe material of each frame part 13c, 13a, 13d, 13b is formed by bending an integral skeleton pipe 12 into a substantially rectangular shape.

However, as shown in FIG. 1, the skeleton pipe 12 has one end 12 </ b> A positioned on the inner side frame portion 13 d (hereinafter referred to as “inner side portion frame portion 13 d”) and the other end 12 </ b> B. Located in the lower frame portion 13b, its intermediate portion extends over the upper frame portion 13a and the side frame portion 13c on the outer side in the vehicle width direction (hereinafter referred to as “outer side portion frame portion 13c”). However, one end 12A of the skeleton pipe 12 starts from a position spaced a predetermined distance above the lower end of the inner side frame portion 13d, and the other end 12B ends in front of the inner side frame 13d. That is, the part which comprises the lower frame part 13b of the frame | skeleton pipe 12 forms the separation space S between the inner side side frame parts 13d.
In the case of this embodiment, each of the side plates 14a and 14b constituting the outer side frame portion 13c and the inner side frame portion 13d is configured by joining a plurality of plate materials.

By the way, the lower ends of the side plates 14a and 14b on the outer side and the inner side in the vehicle width direction extend below the lower frame portion 13b, and the vicinity of the lower ends of the side plates 14a and 14b is the cushion frame 7. Are disposed inside the rear end regions of the plate members 6A and 6B on both sides thereof, and are connected to the rear end portions of the cushion frame 7 via the tilt shaft 15 so as to be tiltable. This tilting shaft 15 constitutes the axis of the reclining mechanism, and extends along the vehicle width direction so as to straddle the plate members 6A, 6B on both sides of the cushion frame 7.
Reference numerals 16 and 17 denote support mats and support wires attached to the outer side frame portion 13c and the inner side frame portion 13d in order to support a pad material (not shown) of the seat back 3.

  Further, in the separation space S provided between the lower frame portion 13b and the inner side frame portion 13d, a rotational force around the tilting axis 15 is applied to the seat back frame 13 so that the inclination angle of the seat back frame 13 is increased. A drive motor 30 for electric adjustment is disposed. The drive motor 30 is provided in a range extending from the peripheral region of the tilt shaft 15 to the separation space S.

3 and 4 are views showing the lower half region of the outer side frame portion 13c and the vicinity of the connecting portion of the lower frame portion 13b, and FIG. 5 is a cross-sectional view corresponding to the CC cross section of FIG. It is. FIG. 6 is a view showing the vicinity of the lower half region of the inner side frame portion 13d and the connecting portion of the lower frame portion 13b, and FIG. 7 is a cross-sectional view corresponding to the DD cross section of FIG. is there.
An impact load that protrudes outward in the vehicle width direction on the outer surface in the vehicle width direction of the side plate 14a forming the outer side frame portion 13c and is input from the vehicle body side portion (for example, the center pillar) at the time of a side collision or the like. Is attached to the seat back frame 13.

The first load transmission block 18 is formed by joining the peripheral portions of a metal substantially rectangular half-shaped container-like front block 18A and rear block 18B to each other, and has a substantially rectangular cross section that is long in the vertical direction. It extends outward in the vehicle width direction. The front surface of the front block 18A is a seat surface to which an airbag unit (not shown) is attached, and a pair of indentations 19 and 19 are spaced apart from each other on the inner edge in the vehicle width direction of the front block 18A. Is formed. The inner edge of the front block 18A is undulated in the vertical direction by the depressions 19 and 19, thereby improving the rigidity in the vehicle width direction. In addition, a tongue piece 20 that protrudes inward in the vehicle width direction is provided in an inner region in the vehicle width direction of the bottom wall of each recess 19.
The first load transmission block 18 is overlaid on the outer surface of the side plate 14a in the vehicle width direction, and the peripheral area of the contact portion with the side plate 14a is fixed to the side plate 14a by welding. . However, as shown in FIG. 4, long hole-like through holes 21 and 21 are formed at positions corresponding to the tongue piece 20 of the first load transmitting block 18 on the side plate 14a. Each tongue piece 20 is directly fixed to the skeleton pipe 12 by welding through 21 and 21.

  As shown in FIG. 4, a cylindrical boss portion 22 surrounding the outer peripheral area of the tilt shaft 15 protrudes from the rear end portion of the plate material 6 </ b> A on the outer side in the vehicle width direction of the cushion frame 7. A second load transmission block 23 is attached to 22. The second load transmission block 23 directly transmits the impact load input from the lower region of the side of the vehicle body to the lower end region of the seat back frame 13 (region where the tilting shaft 15 exists) at the time of a side collision of the vehicle. It is a member and has a honeycomb structure in which a plurality of cylindrical cross sections extending in the vehicle width direction are arranged in parallel, and the whole is formed into a short-axis columnar shape by a resin.

By the way, the lower frame portion 13b disposed above the tilting shaft 15 has a metal rear underside in which both edges in the seat width direction are coupled to the outer side frame portion 13c and the inner side frame portion 13d. Plate 24 (plate-like strength member) is coupled. The rear under plate 24 is welded and fixed at the upper edge to the upper surface of the rear side of the lower frame portion 13b. As shown in FIG. 5, the region extending downward from the weld fixing portion is located on the rear side of the tilt shaft 15. Further, the lower edge portion is bent forward to cover the lower side of the tilting shaft 15. The rear under plate 24 extends at its lower end to a position lower than the tilting shaft 15. Lower edge portions on both sides of the rear under plate 24 are welded and fixed to the side plates 14a and 14b of the outer side frame portion 13c and the inner side frame portion 13d at a position lower than the tilting shaft 15.
Particularly, as shown in FIGS. 6 and 7, the inner edge of the rear under plate 24 in the vehicle width direction extends around the outer rear side of the drive motor 30 so as to wrap around the lower side, and the inner side frame portion. It is coupled to the 13d side plate 14b over a lower height region than the drive motor 30. Specifically, the inner edge of the rear under plate 24 in the vehicle width direction is superposed on the arc surface of the lower end of the side plate 14b and fixed by welding.

  Further, in the case of this embodiment, the skeletal pipe 12 constituting the lower frame portion 13b has an inclined portion that bends obliquely upward toward the outer side frame portion 13c (side plate 14a) as shown in FIG. 12a is provided. The edge of the rear under plate 24 on the outer side in the vehicle width direction has its upper end gradually becoming higher toward the side end along the inclined portion 12a. As shown in FIG. 6, the other end 12B of the skeleton pipe 12 constituting the lower frame portion 13b does not extend to the inner side frame portion 13d. As with the outer edge in the vehicle width direction, the height of the upper end portion gradually increases toward the side end portion.

Further, a metal front under plate 25 (a plate-like reinforcing member) is disposed on the front side of the lower frame portion 13b and the tilting shaft 15. As shown in FIG. 5, the front under plate 25 has an upper end welded and fixed to the upper surface on the front side of the lower frame portion 13b, and both edges in the seat width direction are connected to the outer side frame portion 13c and the inner side. It is fixed by welding to each side plate 14a, 14b of the part frame part 13d. Note that the upper end portion of the front under plate 25 may be fixed to the upper end portion of the rear under plate 24 by welding. The region extending downward from the lower frame portion 13b of the front under plate 25 covers the front side of the tilt shaft 15, and the lower edge portion is bent backward at a position lower than the tilt shaft 15, so that the tilt shaft 15 is welded and fixed to the lower end of the rear under plate 24 at a position covering the lower portion of the rear under plate 24. Note that, as with the rear under plate 24, the edge of the front under plate 25 on the outer side in the vehicle width direction has an upper end that gradually increases in height toward the side end. A region extending from the front surface to the upper surface of the tilting shaft 15 is notched in the inner edge in the width direction.
A part of the drive motor 30 protrudes from the notch 31 of the front under plate 25 so that interference between the drive motor 30 and the front under plate 25 when the seat back frame 13 is tilted is avoided.

  As shown in FIG. 5, the front under plate 25 forms a closed cross section that extends in the vehicle width direction together with the rear under plate 24. The closed cross section of the front under plate 25 and the rear under plate 24 covers the periphery of the tilting shaft 15 and connects the lower end portions of the outer side frame portion 13c and the inner side frame portion 13d.

  In the above configuration, when the impact load is input to the vehicle body side portion at the time of a side collision of the vehicle and the vehicle body side portion is deformed inward in the vehicle width direction, the deformed vehicle body side portion is connected to the first load transmission block 18 and the second load transmission block 18. It abuts against at least one of the load transmission blocks 23, and the impact load is transmitted to the outer side frame portion 13 c of the seat back frame 13.

  Thus, when an impact load is input to the outer side frame portion 13c, the rear under plate 24 and the front under plate 25 extending in the vehicle width direction cause the impact load to be applied to the inner side frame portion 13d together with the lower frame portion 13b. Is transmitted to the lower end. The load transmitted to the inner side frame portion 13d moves to the floor tunnel (not shown) through the console box (not shown) at the center in the vehicle width direction along with the movement of the entire seatback frame 13 toward the inside in the vehicle width direction. Promptly communicated.

As described above, in the vehicle seat 1, the separation space S is provided between the lower frame portion 13 b and the inner side frame portion 13 d of the seat back frame 13, and the drive motor 30 for reclining adjustment is provided in the separation space S. And the rear under plate 24, which is a plate-like strength member, bypasses the outside of the drive motor 30 and connects the lower frame portion 13b and the inner side frame portion 13d. 30 is compactly incorporated in the lower region of the seat back frame 13, but the impact load input from the vehicle body side by the cooperation of the lower frame portion 13 b and the rear under plate 24 is applied to the lower region of the seat back frame 13 in the vehicle width direction. It can be efficiently transmitted to the inner region.

  In addition, the vehicle seat 1 extends to a height at which the rear under plate 24 turns to the lower side of the drive motor 30, and an end portion on the inner side in the vehicle width direction of the rear under plate 24 is in a height region lower than the drive motor 30. As a result, since the structure is coupled to the inner side frame portion 13d, the impact load can be efficiently transmitted to a sufficiently low position of the inner side frame portion 13d.

In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary. For example, in the above embodiment, the front under plate 25 that is a plate-like reinforcing member is provided separately from the rear under plate 24 that is a plate-like strength member. However, the plate-like reinforcing member is not necessarily provided.
In the above embodiment, the rear under plate 24 disposed on the rear side of the lower frame portion 13b and the tilt shaft 15 is a plate-shaped strength member, but is disposed on the front side of the lower frame portion 13b and the tilt shaft 15. Only the front under plate 25 may be provided, and the front under plate 25 may be a plate-like strength member. Further, in the above embodiment, the seat back frame 13 is supported on the rear end portion of the cushion frame 7 via the tilt shaft 15, but the seat back frame 13 is supported on the vehicle body via the tilt shaft 15. It may be a thing.

DESCRIPTION OF SYMBOLS 1 ... Vehicle seat 13 ... Seat back frame 13b ... Lower frame part 13c, 13d ... Side part frame part 18 ... 1st load transmission block (load transmission block)
24 ... Rear under plate (plate-like strength member)
25. Front under plate (plate-shaped reinforcing member)
30 ... Drive motor
31 ... Notch

Claims (4)

A seat having a pair of side frame portions on the outer and inner sides in the vehicle width direction and spaced apart in the seat width direction, and a lower frame portion extending in the seat width direction between lower regions of the both side frame portions Back frame,
In a vehicle seat comprising: a load transmission block that is installed on an outer surface of the side frame portion on the outer side in the vehicle width direction and transmits an impact load input from a vehicle body side portion to the seat back frame;
A spacing space is provided between an end portion of the lower frame portion on the inner side in the vehicle width direction and a side frame portion on the inner side of the vehicle width direction,
A drive motor for adjusting the inclination angle of the seat back frame is disposed in the separation space, and
A plate-like strength member that bypasses the outside of the drive motor and connects the lower frame part and the side frame part on the inner side in the vehicle width direction is provided on the rear side of the lower frame part ,
A plate-like reinforcing member is disposed on the front side of the lower frame part,
The vehicle is characterized in that the plate-shaped strength member and the plate-shaped reinforcing member connect lower side portions of the side frame portion on the outer side in the vehicle width direction and the side frame portion on the inner side in the vehicle width direction . Sheet. The plate-like strength member extends from the lower frame portion to a height that wraps around to the lower side of the drive motor, and the end portion on the inner side in the vehicle width direction of the plate-like strength member extends over a lower height region than the drive motor. Is coupled to the arc surface at the lower end of the side frame portion on the inner side in the vehicle width direction,
2. The vehicle seat according to claim 1, wherein the plate-like reinforcing member is provided with a notch portion in which a region extending upward from the front surface of the tilt axis of the seat back frame is notched. The plate-like strength member is fixed to the pipe as the lower frame portion at the upper end portion, and is joined to the arc surface at the lower end of the side frame portion on the inner side in the vehicle width direction at the lower edge portion,
The plate-like reinforcing member is fixed to the pipe as a lower frame portion at an upper end portion, and is joined to an arc surface at a lower end of the side frame portion on the inner side in the vehicle width direction at a lower edge portion. The vehicle seat according to claim 1 or 2. The lower end of the plate-like strength member and the lower end of the plate-like reinforcing member are connected to overlap each other,
The lower end of the plate-shaped strength member and the lower end of the plate-shaped reinforcing member are coupled to an arc surface at the lower end of the side frame portion on the inner side in the vehicle width direction. The vehicle seat according to claim 1.

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