JP4043911B2 - Vehicle seat - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle seat, and more particularly, to a vehicle seat that reduces a rearward tilt of an occupant's head when an impact greater than a predetermined value is applied to a passenger seated on a vehicle seat such as an automobile from the rear of the vehicle. .
[0002]
[Prior art]
Conventionally, in a vehicle seat such as an automobile, when an impact of a predetermined value or more is applied from the rear of the vehicle at the time of a rear collision, the lower part of the headrest support arm moves to the rear of the vehicle by being pressed toward the vehicle by the back of the occupant. Therefore, a configuration is known in which the headrest provided on the headrest support arm moves instantaneously so as to approach the head of the occupant and the occupant's head is reliably received by the headrest (for example, a patent Reference 1).
[0003]
[Patent Document 1]
JP-A-10-181403 (paragraphs [0004], [0010], FIG. 4)
[0004]
[Problems to be solved by the invention]
However, when such a vehicle seat is used for a so-called rear seat power seat that electrically tilts the seat back backward, the seat back of the rear seat power seat is connected to the tension panel behind it. Because of the presence of the adjuster, there is almost no stroke cost to the rear of the vehicle below the headrest support arm. As a result, when the lower part of the headrest support arm moves backward in the vehicle, the headrest provided on the upper part of the headrest support arm moves instantaneously so as to approach the occupant's head, so that a sufficient effect cannot be obtained. . For this reason, the seat back and the headrest tilt backward simultaneously, and the rearward tilt of the occupant's head at the time of a rear collision increases.
[0005]
In view of the above facts, an object of the present invention is to provide a vehicle seat that can reduce the rearward tilt of the occupant's head at the time of a rear collision in the rear seat power seat.
[0006]
[Means for Solving the Problems]
The vehicle seat according to the first aspect of the present invention is formed at an intermediate portion in the vertical direction of the seat back frame, and is bent when a load of a predetermined value or more acts from the front of the vehicle to the rear of the vehicle. ,
It has a pair of upper and lower link members which are disposed along the vehicle longitudinal direction together with the upper portion from the middle folding portion for connecting the seat back frame and the partition panel, to move the seat back to the vehicle longitudinal direction Seat back moving means,
Formed in the lower link member of the pair of upper and lower link members, and when a load greater than or equal to the predetermined value acts from the front of the vehicle to the rear of the vehicle, a weakened portion that crushes only the lower link member;
Have a, the seat back frame with the collapse of the lower side of the link member, characterized in that the bending.
[0007]
Therefore, when a load of a predetermined value or more is applied to the seat back from the front of the vehicle toward the rear of the vehicle by the back of the occupant at the time of rearward collision of the vehicle, the bent portion formed in the middle portion in the vertical direction of the seat back frame is bent. . In addition, when the load is applied, a pair of upper and lower link members that connect the seat back frame and the partition panel and are disposed along the vehicle front-rear direction at a position above the middle folding portion of the seat back frame. have a, the seat back only the lower side of the link member as a starting point the fragile portion formed on the lower side of the link member in the upper and lower pair of link members in the seat back moving means for moving the vehicle longitudinal direction is crushed. As a result, the seat back frame bends in a square shape around the center folding portion. For this reason, compared with the case where the headrest disposed in the upper part of the seat back frame tilts backward integrally with the seat back frame, the headrest approaches the occupant head, and the rear tilt of the occupant head at the time of a rear collision is reduced.
[0008]
According to a second aspect of the present invention, in the vehicle seat according to the first aspect, the fragile portion is a V-shaped bent portion in a side view.
[0009]
Therefore, in addition to the content described in claim 1, since the weak part of the link member is a V-shaped bent part in a side view, a simple configuration is ensured while ensuring rigidity in the vertical direction and the horizontal direction of the link member. Thus, the link member can be reliably crushed when a load of a predetermined value or more acts from the front of the vehicle toward the rear of the vehicle.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
1st Embodiment of the vehicle seat in this invention is described according to FIG.1 and FIG.2.
[0011]
In the figure, the arrow FR indicates the vehicle forward direction, and the arrow UP indicates the vehicle upward direction.
[0012]
As shown in FIG. 2, in the present embodiment, the rear seat 10 of the automobile is a so-called power seat, and the seat back 12 is changed from a normal state indicated by a two-dot chain line in FIG. The reclining state indicated by the chain line is movable by an actuator that is operated by a motor (not shown).
[0013]
An intermediate portion in the vertical direction of the seat back frame 14 constituting the skeleton of the seat back 12, that is, a portion of the seat back frame 14 facing the vertical direction intermediate portion of the back portion 18 </ b> A of the occupant 18 seated on the rear seat 10. 20 is formed. The folded portion 20 connects the upper portion 22 and the lower portion 24 of the seat back frame 14 by a shaft 26 extending in the vehicle width direction, and is directed from the front of the vehicle to the rear of the vehicle (in the direction of arrow A in FIG. 2). When the load more than the predetermined value F1 is applied, it bends.
[0014]
A link mechanism 32 as a seat back moving means for connecting the upper portion 22 of the seat back frame 14 and the partition panel 30 to a portion above the middle folded portion 20 of the seat back frame 14, that is, the upper portion 22 of the seat back frame 14. The link mechanism 32 constitutes an adjuster with other members such as a motor (not shown).
[0015]
The partition panel 30 divides the passenger compartment 34 and the trunk room 36 at the rear portion of the rear seat 10.
[0016]
As shown in FIG. 4, the link mechanism 32 includes a partition panel mounting portion 40 fixed to the partition panel 30, a seat back frame mounting portion 42 fixed to the upper portion 22 of the seat back frame 14, and the vehicle longitudinal direction. And a pair of upper and lower link members 44, 46 that connect the partition panel mounting portion 40 and the seat back frame mounting portion 42, and a connection link 47 that connects the pair of upper and lower link members 44, 46 to each other. ing.
[0017]
The upper link member 44 on the upper side of the pair of upper and lower link members 44 and 46 includes a first link 48, a second link 50, and a third link 52, and a front end portion 48 </ b> A of the first link 48 is a pin 54. Thus, it is pivotally supported by the upper part 42A of the seat back frame mounting part 42. Further, the second link 50 is rotatably supported at the front end portion 50A by the pin 56 on the rear end portion 48B of the first link 48, and the rear end portion 50B is connected to the upper portion 40A of the partition panel mounting portion 40 by the pin 58. It is pivotally supported so that it can rotate. The third link 52 is pivotally supported by a pin 60 so that the front end upper part 52A is rotatable in the vicinity of the rear end part 48B of the first link 48, and the rear end part 52B is supported by the pin 62 at the upper part of the partition panel mounting part 40. It is rotatably supported in the vicinity of 40A.
[0018]
On the other hand, the lower link member 46 on the lower side of the pair of upper and lower link members 44 and 46 includes a first link 66 and a second link 68, and a front end portion 66 </ b> A of the first link 66 is seated by a pin 70. The lower frame 42B of the back frame mounting part 42 is rotatably supported. The second link 68 has a front end upper part 68A rotatably supported by a pin 72 on a rear end part 66B of the first link 66, and a rear end part 68B is connected to a lower part 40B of the partition panel mounting part 40 by a pin 74. It is pivotally supported so that it can rotate.
[0019]
Further, the connecting link 47 is pivotally supported by the front end lower portion 52C of the third link 52 of the upper link member 44 by the pin 78 at the upper end portion 47A, and the lower link member 46 by the pin 80 at the lower end portion 47B. The second link 68 is rotatably supported by a lower front end 68C.
[0020]
The first link 66 of the lower link member 46 has a V shape with the opening facing downward in a side view, and the middle portion is a bent portion 84 as a fragile portion. Therefore, when a load greater than or equal to the predetermined value F2 (F1 = F2) is applied from the front of the vehicle to the rear of the vehicle (in the direction of arrow A in FIG. 4), the first of the lower link member 46 starts from the bent portion 84. The link 66 is crushed from the normal state shown by a solid line in FIG. 4 as shown by a two-dot chain line in FIG.
[0021]
As shown in FIG. 2, the lower portion 86 </ b> A of the headrest frame 86 is connected to the upper portion 22 of the seat back frame 14, and the headrest 88 is disposed on the upper portion 86 </ b> B of the headrest frame 86.
[0022]
Next, the operation of this embodiment will be described.
[0023]
In the present embodiment, when a load of a predetermined value F1 or more acts on the seat back 12 of the rear seat 10 from the front of the vehicle toward the rear of the vehicle (in the direction of arrow A in FIG. 2) by the back 18A of the occupant 18 at the time of the rear collision of the vehicle. In addition, the middle bent portion 20 formed at the intermediate portion in the vertical direction of the seat back frame 14 is bent. Further, when the load is applied, a lower link member that constitutes a link mechanism 32 that connects the upper portion 22 of the seat back frame 14 and the partition panel 30 at a position above the middle folded portion 20 of the seat back frame 14. Starting from the bent portion 84 formed on the first link 66 of 46, the first link 66 is crushed from the normal state shown by the solid line in FIG. 4 as shown by the two-dot chain line in FIG.
[0024]
As a result, in this embodiment, as shown in FIG. 1, the seat back frame 14 bends in a square shape with the center folded portion 20 as the center. For this reason, the headrest 88 disposed on the upper portion of the seat back frame 14 is closer to the occupant head 18B than the case of tilting backward integrally with the seat back frame 14, and the rear of the occupant head at the time of the rear collision. Reduce tilt.
[0025]
In the present embodiment, as shown in FIG. 4, the weakened portion formed in the first link 66 of the lower link member 46 is a V-shaped bent portion 84 in a side view. The first link 66 can be reliably crushed when a load of a predetermined value or more is applied from the front of the vehicle to the rear of the vehicle with a simple configuration while ensuring the rigidity in the direction and the left-right direction.
[0026]
Although the present invention has been described in detail with reference to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art. For example, in the above-described embodiment, the fragile portion formed in the first link 66 of the lower link member 46 is the V-shaped bent portion 84 whose opening is directed downward in a side view, but the fragile portion is limited to this. If the first link 66 can be reliably crushed when a load of a predetermined value or more is applied from the front of the vehicle to the rear of the vehicle, a V-shaped bent portion with the opening facing upward in a side view Alternatively, other configurations such as a thin-walled portion and a hole forming portion may be used.
[0027]
【The invention's effect】
The vehicle seat according to the first aspect of the present invention is formed at an intermediate portion in the vertical direction of the seat back frame, and is bent when a load of a predetermined value or more acts from the front of the vehicle to the rear of the vehicle. , have a pair of upper and lower link members which are disposed along the vehicle longitudinal direction as well as connecting the seat back frame and the partition panel at the site of the above the middle folding unit, for moving the seat back in the vehicle longitudinal direction The seat back moving means and the lower link member of the pair of upper and lower link members are fragile to crush only the lower link member when a load of a predetermined value or more is applied from the front of the vehicle to the rear of the vehicle. possess a part, and since the seat back frame with the collapse of the lower link member is bent, it is possible to reduce the backward tilting of the head of the occupant of the rear-end collision Has an excellent effect say.
[0028]
According to the second aspect of the present invention, in the vehicle seat according to the first aspect, since the fragile portion is a V-shaped bent portion in a side view, in addition to the effect of the first aspect, the link member An excellent effect that the link member can be reliably crushed when a load of a predetermined value or more acts from the front of the vehicle to the rear of the vehicle with a simple configuration while ensuring the rigidity in the vertical direction and the horizontal direction. Have.
[Brief description of the drawings]
FIG. 1 is a schematic side view showing a state of a rear collision in a vehicle seat according to an embodiment of the present invention.
FIG. 2 is a schematic side view showing a normal state of the vehicle seat according to the embodiment of the present invention.
FIG. 3 is a schematic side view showing a reclining state in the vehicle seat according to the embodiment of the present invention.
FIG. 4 is an enlarged side view showing a link mechanism in the vehicle seat according to the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Car back seat 12 Seat back 14 Seat back frame 20 Middle folding part 22 Upper part 30 of a seat back frame Partition panel 32 Link mechanism (seat back moving means)
44 Upper link member 46 of link mechanism Lower link member 66 of link mechanism First link 84 of lower link member Bent part (fragile part) of first link
88 headrest

Claims (2)

Formed in the middle part of the seat back frame in the vertical direction, and when a load greater than or equal to a predetermined value acts from the front of the vehicle to the rear of the vehicle,
It has a pair of upper and lower link members which are disposed along the vehicle longitudinal direction together with the upper portion from the middle folding portion for connecting the seat back frame and the partition panel, to move the seat back to the vehicle longitudinal direction Seat back moving means,
Formed in the lower link member of the pair of upper and lower link members, and when a load greater than or equal to the predetermined value acts from the front of the vehicle to the rear of the vehicle, a weakened portion that crushes only the lower link member;
Have a vehicle seat in which the seat back frame with the collapse of the lower side of the link member, characterized in that the bending.   The vehicle seat according to claim 1, wherein the fragile portion is a V-shaped bent portion in a side view.

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