JP2000103273A - Vehicular seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular seat having a compact submarine suppressing mechanism with simple constitution. SOLUTION: A submarine suppressing mechanism 15 arranged in a seat 10 has brackets 20, 25 arranged in a cushion frame 12, links 22, 27 and a submarine suppressor 30 supported by the links 22, 27. In the links 22, 27, each one end side is rotatably supported on the brackets 20, 25 by support shafts 21, 26, and the other end side of the links 22, 27 is put in an obliquely upward turning posture. The submarine suppressor 30 has a first rod 35, a second rod 36 and a gas generator for generating gas for actuating the rods 35, 36 to the extending side at vehicle collision time. The gas generator burns at collision time, and when the rods 35, 36 move to the extending side, the links 22, 27 rotationally rise by interlocking with the movement, so that the submarine suppressor 30 moves up to a rising position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat for preventing a submarine phenomenon at the time of a collision in a front seat or a rear seat of a vehicle such as an automobile.

[0002]

2. Description of the Related Art At the time of a frontal collision of an automobile, if the seat belt is not worn on the occupant in a regular state, the occupant restrained by the seat belt will be in a posture of sneaking downward, and the waist belt will come off the pelvis. (The so-called submarine phenomenon). When such a submarine phenomenon occurs, the buttocks or lower limbs of the occupant move forward and downward,
It is conceivable that the seat belt is hung on the occupant's abdomen, or that the lower limbs collide with the instrument panel in front of the occupant.

In order to suppress the submarine phenomenon, it has been conventionally proposed to provide a projection or a panel at the front end of the seat frame. Alternatively, Japanese Unexamined Patent Publication
Japanese Patent Application Laid-Open No. 2-229378, which uses an airbag, a device which mechanically lifts the front end of a seat as disclosed in Japanese Utility Model Laid-Open No. 2-149328,
Japanese Patent Application Laid-Open No. 7240 discloses a device that mechanically lifts using an explosive actuator.

[0004]

However, in the prior art in which the above-mentioned projections and panels are provided, there has been a problem that the frame is deformed into a "-" shape so that a sufficient submarine inhibiting effect cannot be exhibited. In addition, the above-mentioned air bag and the conventional technology of mechanically lifting the seat are all complicated in structure, have many parts, and lack compactness. It was a fact that it was difficult to put it into the market, and it was difficult to commercialize the product due to difficulties in layout.

Accordingly, an object of the present invention is to provide a vehicle seat having a submarine restraining mechanism which is simple in structure, compact and operates reliably.

[0006]

SUMMARY OF THE INVENTION A vehicle seat according to the present invention comprises:
As described in claim 1, a cushion frame provided on the seat, a bracket provided on both sides of the cushion frame, and a first rod provided between the pair of brackets and inserted into the first rod and the first rod. A submarine suppressor having a two-rod and a gas generator that generates gas at the time of collision of the vehicle, wherein the second rod operates in a direction extending from the first rod when gas is generated from the gas generator; When the first rod and the second rod of the submarine inhibitor move toward the extension side, a link is provided to connect the submarine inhibitor to the bracket so as to move the submarine inhibitor in an ascending direction.

According to the present invention, when the collision is detected, the gas generator rapidly generates gas, so that the first rod and the second rod of the submarine suppressor having the built-in actuator operate in directions extending from each other. With this operation, the submarine inhibitor moves instantaneously to the upper position via the link. Thus, the submarine phenomenon in which the occupant sinks in the seat is suppressed.

According to the present invention, as described in claim 2,
The pair of links each has one end rotatably attached to each of the brackets so that the other end of the link is directed obliquely upward, and the first rod is attached to the other end of the pair of links. The end of the second rod is rotatably connected by a shaft, and when the first rod and the second rod move to the extension side, the link rotates and the submarine restraining body rises. Contains. In the present invention thus configured, when the submarine suppressor operates on the extension side, the movement directly acts in the direction of rotating and raising the link, so that the submarine suppressor instantaneously rises to a desired height. .

According to the present invention, as described in claim 3,
The submarine inhibiting body includes a return inhibiting mechanism for preventing the first rod and the second rod from returning to the contracting side after moving to the extending side.
In this case, even if any reaction force or the like is applied in the direction of contracting the rod after the operation, the rod can be prevented from contracting, and the submarine inhibitor can be reliably maintained at the desired height.

According to the present invention, as described in claim 4,
A deformation adjusting portion which is more easily deformed with respect to the load of the occupant applied from above at the time of collision than the portion near the center of the seat is provided in the region of the first rod and the second rod near the bracket. This can deform the submarine restraining body into a desirable shape when the submarine restraining body rises due to a collision and receives the load of the occupant. Make it possible to lower.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] (FIGS. 1 to 5) This vehicle seat 10 has a frame (cushion frame) 12 of a seat portion 11 and left and right portions located on both sides of the cushion frame 12. A submarine suppressing mechanism 15 provided between the pair of side frame parts 13 and 14 is provided.

The submarine restraining mechanism 15 has a first bracket 20 fixed to one side frame portion 13 and a first bracket 20 supported by the first bracket 20 so as to be vertically rotatable by a support shaft 21 in a front-rear direction. Link 22 and second bracket 2 fixed to the other side frame portion 14
5 and a second link 27 supported by the second bracket 25 so as to be vertically rotatable by a support shaft 26 in the front-rear direction.
And a submarine restraining body 30 that extends between the first link 22 and the second link 27 and extends in the width direction of the seat 11.
And so on.

The first link 22 and the second link 27 each have one end supported by the support shafts 21 and 26 and the other end protruding obliquely upward so as to face each other. Can be turned up and down around the center. The brackets 20 and 25 are fixed to the side frame portions 13 and 14 by fastening members 31 such as bolts and rivets or fixing means such as welding.

The submarine restraining body 30 includes a hollow first rod 35 extending in a direction crossing the cushion frame 12 (in the width direction of the seat), and a second rod inserted movably in the axial direction with respect to the first rod 35. 36.
The first rod 35 and the second rod 36 are located on the same axis.

One end 35a of the first rod 35 is rotatably supported by the first link 22 by a connecting shaft 40 parallel to the support shaft 21. By forming a recess 41 inwardly formed by plastic working in the vicinity of the end 35a, the second moment of area in the vertical direction in the region near the end 35a is made smaller than that of the portion near the center of the seat. I have. Further, by slightly flattening the upper surface side of the region near the end 35a of the first rod 35, the pressure receiving area expanding portion 42
Is formed. The other end 35b of the first rod 35 is
The rod 36 has an opening with an inner diameter capable of being inserted.

One end 36a of the second rod 36 is rotatably supported by the second link 27 by a connecting shaft 45 parallel to the support shaft 26. By forming a concave portion 46 recessed inward by plastic working near the end portion 36a, the vertical moment of inertia in the region near the end portion 36a in the vertical direction is made smaller than that of the portion near the center of the seat. I have. Further, the upper surface side of the region near the end 36a of the second rod 36 is slightly flattened, so that the pressure receiving area expanding portion 47 is crushed.
Is formed.

The other end 36b of the second rod 36 is connected to one end 3
6a is formed to have a smaller diameter than the other end 36b.
The rod 35 is inserted into the inside of the first rod 35 through an opening at the end 35b. The first rod 35 and the second rod 36 are relatively movable in the axial direction when the ends 35b and 36b are fitted to each other.

The first link 22 and the second link 27 are shown in FIG.
As shown by solid lines in FIG.
It is rotatable in the vertical direction from the lowering position where it is tilted at an upward angle α so as to be positioned above the upper position from the rising position indicated by the two-dot chain line. Here, each link 22, 27
Let L2 be the distance between the connecting shafts 40 and 45 when the link is in the lowered position and L2 be the distance between the connecting shafts 40 and 45 when the links 22 and 27 are in the raised position.
It is set to be longer than (2 × L3).

In other words, when the distance between the connecting shafts 40 and 45 is L1, the submarine inhibitor 30 is at the lowered position, that is, at the height indicated by H1 in FIG.
Submarine inhibitor 3 until the distance between 0 and 45 becomes L2
When 0 is extended, the submarine suppressing body 30 is configured to move to the above-mentioned raised position, that is, the height indicated by H2 in FIG. 3A.

The links 22, 27 can be brought into contact with the lower stopper walls 20a, 25a of the brackets 20, 25 when the links 22, 27 are lowered to the lowered position.
7 is prevented from falling further.
When the links 22 and 27 move to the raised position, the enlarged diameter portion 48 (shown in FIG. 4) of the second rod 36 moves to the first position.
By contacting the stopper portion 49 of the rod 35, the rods 35 and 36 are prevented from further extending.

Therefore, the submarine inhibitor 30 is linked to link 2
When attached to the brackets 20 and 25 via the brackets 2 and 27, the distance between the connecting shafts 40 and 45 is prevented from being larger than L2. Therefore, the first rod 3
In the range where the links 22 and 27 can rotate (the range where the submarine restraining body 30 can move up and down), the 5 and the second rod 36 have an overlapping margin of at least L5 or more as shown in FIG. A rod 35,
Openings 20b, 25b into which the ends 35a, 36a of 36 can enter are formed.

Submarine inhibitor 3 with built-in actuator
One example of 0 is configured as shown in FIG. This has a collar 50 fixed inside the axially intermediate portion of the cylindrical first rod 35. This color 50
An example of means for fixing the first rod 35 to the first rod 35 is “caulking” processing by plastically deforming a part of the first rod 35 from the outside, but it may be fixed by means other than caulking. Reference numeral 51 in the drawing indicates a caulking portion.

A piston portion 55 is provided inside the first rod 35. The piston portion 55 is fixed to the tip of the second rod 36, and is movable in the axial direction with respect to the first rod 35. A gas expansion chamber 56 is formed between the collar 50 and the piston part 55. The piston portion 55 is provided with a sealing material 57 such as an O-ring for sealing the gas expansion chamber 56.

A gas generator (squib:
Gunpowder) 60 is provided. The gas generator 60 has a built-in ignition system 62 such as a heater to which a lead wire 61 is connected. The lead wire 61 is a sensor 6 for detecting a vehicle collision.
3 and is ignited by a current supplied to an ignition system 62 via a lead wire 61 when a collision is detected, and the gas generator 60 burns rapidly to generate gas. The sensor 63 may be a collision detection sensor used for an airbag, and may be configured to ignite the gas generator 60 in synchronization with the deployment of the airbag.

Next, the operation of the first embodiment (FIGS. 1 to 5) will be described.

The submarine inhibitor 30 of this embodiment is
The connecting shafts 40, 4 are in a contracted state (length L1).
5 and links 22 and 27 and brackets 20 and 25, which are assembled to the cushion frame 12. Then, when the vehicle is in a normal operation state (at the time of non-collision), the submarine restraining body 30 is moved to the lower position (height H) shown in FIG.
1). Therefore, the occupant M can sit on the submarine suppressor 30 without any discomfort.

At the time of collision, the sensor 63 is activated and the lead wire 6
The gas generator 60 is ignited by the current supplied via 1 and the gas generator 60 burns rapidly. As a result, the expanding gas is jetted into the gas expansion chamber 56. Therefore, when the second rod 36 moves in the direction protruding from the first rod 35, the distance between the connection shafts 40 and 45 increases to L2. For this reason, the submarine restraining body 30 moves to the ascending position H2 shown in FIG. 3A, and the buttocks or thighs of the occupant M are suppressed from sinking below the seat portion 11, and the submarine phenomenon is prevented. Is done.

In the case of this embodiment, the reaction force due to gas ejection when the gas generator 60 burns is a thrust for moving the second rod 36 rightward in FIG. 4, and furthermore, due to an increase in the internal pressure accompanying the gas generation. Since the first rod 35 is pushed back in the left direction, the rods 35 and 36 can be operated to the extension side with little energy loss and high efficiency.

When the submarine suppression mechanism 15 is activated,
In other words, when the submarine restraining body 30 moves to the extension side and rises and the load of the occupant is applied from above the submarine restraining body 30, if the second moment of area is uniform over the entire length of the submarine restraining body 30, FIG. The deformation behavior is such that the central portion of the submarine inhibitor 30 is largely bent as schematically shown in FIG. When deformed in this manner, the contact length between the thigh or buttocks of the occupant and the submarine restraining body 30 becomes partial, so that the load tends to concentrate and the surface pressure tends to increase.

In consideration of this point, in this embodiment, the submarine restraining body 30 is provided with a deformation adjusting portion including concave portions 41 and 46 near both ends, as shown in FIG. The deformation of the restraint body 30 is bent into a shape in which the contact length between the buttocks or thighs of the occupant M and the submarine restraint body 30 becomes long (a shape in which the longitudinal middle part of the submarine restraint body 30 is relatively flat). No.

Further, by providing the pressure receiving area expanding portions 42 and 47 on the upper surface side of the submarine suppressing body 30, the pressure receiving area between the occupant and the submarine suppressing body 30 can be made as large as possible. For this reason, the peak reaction force at the time of operation decreases and approaches a uniform reaction force, the peak surface pressure decreases, and the energy absorbing ability of the submarine inhibitor 30 increases.

As described above, according to the vehicle seat 10 of this embodiment, the submarine suppressor 30 does not cause a feeling of discomfort during normal operation, and the submarine suppressor 30 rises to a predetermined height during a collision. Thereby, the submarine phenomenon can be effectively prevented.

As shown in FIG. 3 (B), the submarine restraining body 30 moves (rises) at right angles to the direction (lower front) P in which the occupant M moves at the time of collision. The mechanism 15 may be attached to the cushion frame 12 with an inclination angle θ. By doing so, it is possible to prevent the rotation moment from acting on the submarine suppressing body 30 when the load P is input. [Second Embodiment] (FIG. 6) The embodiment shown in FIG. 6 is an example in which a return inhibiting mechanism 80 is provided on the submarine inhibitor 30. That is, the gas generator 60 burns during a vehicle collision, and the first rod 35 and the second rod 3
6 do not return to the contracted side after moving to the extended side. As a structure therefor, a tapered surface 81 is formed on the outer peripheral portion of the piston portion 55, and a plurality of rolling members 82 such as balls are provided between the tapered surface 81 and the inner surface of the first rod 35 in the circumferential direction of the piston portion 55. Housed, and
An elastic member (for example, rubber O-ring) 83 for pressing the rolling member 82 against the tapered surface 81 is housed therein.

When the rods 35 and 36 move toward the extension side due to the combustion of the gas generator 60, the rolling member 82 moves away from the tapered surface 81. Therefore, the rods 35 and 36 are allowed to move to the extension side.
After the rods 35 and 36 extend, some force is applied to the rod 3
When working in the direction to move 5, 36 to the contraction side,
Since the rolling member 82 bites into the tapered surface 81, the rods 35 and 36 are prevented from moving to the contraction side similarly to the so-called one-way linear clutch. For this reason, the submarine inhibitor 30 can be more reliably held at the raised position H2.

The basic configuration and operation of each embodiment described later, including the second embodiment, are the same as those of the seat apparatus 10 of the first embodiment. The same reference numerals are given and the description is omitted. [Third Embodiment] (FIG. 7) In this embodiment, a male screw 92 provided on a piston 55 is provided.
Is screwed into the female screw portion 93 of the second rod 36 to fix the piston portion 55 to the second rod 36. If such a screw-in type piston portion 55 is adopted, the piston portion 55 accommodating the gas generator 60 can be easily assembled to the second rod 36. [Fourth Embodiment] (FIG. 8) In this embodiment, an actuator 10 is mounted on a second rod 36.
0 is incorporated. The actuator 100 includes a cylinder 101, a gas generator 60 housed in the cylinder 101, a gas expansion chamber 102, a piston 103 inserted movably in the axial direction of the cylinder 101, and a cylinder 101 integrated with the piston 103. , A center rod 104 movable in the axial direction, and a spring 105. A collar 106 is provided at an outer end of the center rod 104. The collar 106 is fixed to the first rod 35.

In this embodiment, when the gas generator 60 burns due to a collision, a thrust for moving the cylinder 101 to the right side in the drawing is generated by the ejection of the inflation gas.
The piston 103 and the center rod 104 are driven in a direction to come out of the cylinder 101 by the pressure of the inflation gas.
Here, the center rod 104 is restrained by the first rod 35 via the collar 106, and the cylinder 101 is integrated with the second rod 36 via the stopper wall 107. It will move in the exit direction. For this reason, the first embodiment (FIG. 1)
5), the links 22 and 27 rotate around the support shafts 21 and 26, and the submarine suppressing body 30 rises, so that the submarine phenomenon can be suppressed.

In this embodiment (FIG. 8), since the actuator 100 is housed in the second rod 36, the piston diameter is small, so that the pressure drop due to the movement of the piston 103 after the gas is generated is small. The rods 35 and 36 can be operated to the extension side position while the pushing force of the piston 103 is maintained. Therefore, even when the load of the occupant is applied to the submarine restraining body 30, the rods 35 and 36 can be sufficiently extended, and the submarine restraining body 30 can be instantaneously moved to a desired ascending position.

Further, since the actuator 100 is accommodated in the second rod 36, the actuator built-in type submarine restraining body 30 can be compactly formed into a unit, and the submarine restraining mechanism 15 can be assembled or assembled into the seat portion 11. In addition, the actuator 100 can be handled independently, and the handling is easy.

[0039]

According to the vehicle seat provided with the submarine restraining mechanism of the present invention, the submarine restraining body is lowered under the seat except during a collision, so that there is no foreign body sensation, and instantaneously at the time of a collision. By moving to the upper position, the submarine phenomenon can be effectively suppressed, and the safety of the occupant is further improved. The submarine restraining mechanism of the present invention has a simple structure since it has a compact submarine restraining body with a built-in actuator, and has a small number of parts and can be easily incorporated in a narrow space in the seat. The submarine restraining mechanism of the present invention can be easily incorporated not only into the front seat of the automobile but also into the rear seat.

Since the actuator is integrated into the submarine restraining body to form a unit, it is easy to assemble it into the seat portion, and it can be easily assembled to various seat cushion frames regardless of the type of seat. This increases the degree of freedom in assembling layout design.

[Brief description of the drawings]

FIG. 1 is a perspective view of a vehicle seat according to a first embodiment of the present invention.

FIG. 2 is a front view of a part of the seat shown in FIG. 1;

FIG. 3 is a side view of the seat and the occupant shown in FIG. 1;

FIG. 4 is a cross-sectional view of a portion of the seat submarine restraining mechanism shown in FIG. 1;

FIG. 5 is a front view of the submarine suppressor showing an operation mode of the seat shown in FIG. 1;

FIG. 6 is a cross-sectional view of a part of a submarine suppressing mechanism according to a second embodiment of the present invention.

FIG. 7 is a cross-sectional view of a part of a submarine suppressing mechanism according to a third embodiment of the present invention.

FIG. 8 is a cross-sectional view of a part of a submarine suppressing mechanism according to a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Vehicle seat 12 ... Cushion frame 15 ... Submarine restraining mechanism 20, 25 ... Bracket 22, 27 ... Link 30 ... Submarine restraining body 35 ... 1st rod 36 ... 2nd rod 60 ... Gas generating body 80 ... Return restraining mechanism 100 … Actuator

Claims (4)

[Claims] 1. A cushion frame provided on a seat portion, a bracket provided on both sides of the cushion frame, a first rod provided between the pair of brackets and a second rod inserted into the first rod, and A submarine inhibitor that has a gas generator that generates gas at the time of a vehicle collision, and that operates in a direction in which the second rod extends from the first rod when gas is generated from the gas generator; And a link connecting the submarine inhibitor to the bracket so that the submarine inhibitor is moved in a direction to raise the submarine inhibitor when the first rod and the second rod of the body move toward the extension side. Vehicle seats. 2. A pair of links each having one end rotatably attached to each of the brackets so that the other ends of the links are directed obliquely upward, and The ends of the first rod and the second rod are rotatably connected by a shaft, and when the first rod and the second rod move to the extension side, the link rotates and the submarine restraining body rises. The vehicle seat according to claim 1, wherein the vehicle seat is provided. 3. The submarine inhibitor according to claim 1, further comprising a return inhibiting mechanism for preventing the first rod and the second rod from returning to the contraction side after moving to the extension side. Item 4. A vehicle seat according to item 1. 4. A deformation adjusting section which is more easily deformed than an area near a center of a seat with respect to a load of an occupant applied from above at the time of a collision in a region near the bracket between the first rod and the second rod. The vehicle seat according to claim 1.