JP2007069663A - Automobile seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To positively suppress forward movement while reducing the load and deflection received by a chest portion of an occupant, even if acceleration received by a vehicle body is large at the time of collision of an automobile. <P>SOLUTION: In the automobile seat, an air bag 5 is arranged so as to extend in a width direction of a seat cushion 1 at a front end lower portion of the seat cushion 1, and an inflator 8 jetting gas into the air bag at the time of collision is provided. In the air bag 5, a plurality of expanding portions 6a, 6b is provided in a vehicular fore-and-aft direction by a partitioning member 7. By means such as breaking the partitioning member 7 due to forward movement of an occupant in the mid term/latter term of the collision, for example, the gas in the expanding portion 6b on a rear side is moved to the expanding portion 6a on a front side to release to the outside of the expanding portion 6b on the rear side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an automobile seat, and more particularly to an automobile seat that reliably prevents a passenger from moving forward when the automobile suddenly decelerates.

  Conventionally, when an automobile decelerates suddenly, a seat belt is provided as a means for preventing an occupant from moving forward due to inertia. However, there is a problem in that the occupant's lower back part moves forward while sinking into the seat cushion, so that the occupant's waist does not work effectively, and the initial restraint performance of the occupant's chest may not be sufficiently obtained. Therefore, a cross member such as a pipe is placed across the seat cushion so that it is positioned at the front of the occupant's waist when seated normally on the seat cushion, and the occupant's waist is received by this cross member and moved forward. It has also been proposed to suppress this. However, if the cross member is disposed in the front part of the seat cushion, there is a problem in that the seating comfort of the occupant is deteriorated and the comfort of the drive is hindered. On the other hand, the position of the cross member is lowered to a position that does not affect the seating comfort. Then, there is a problem that the effect of preventing the passenger from moving forward is not obtained.

Therefore, as shown in FIG. 6, an airbag 32 is disposed at the lower front end of the seat cushion 31 so as to extend in the width direction of the seat cushion 31, and is activated during sudden deceleration to cause gas to enter the airbag 32. The inflator 33 for injecting air is provided, the airbag 32 is inflated at the time of sudden deceleration, and the front end of the seat cushion 31 is lifted upward, so that the occupant 34 moves forward at the time of sudden deceleration without deteriorating the sitting comfort of the occupant. There has been proposed a technique in which the initial restraint performance of the chest of the occupant 34 by the stop and the seat belt is improved, and as a result, the peak G (acceleration) received by the chest is lowered (for example, see Patent Document 1).
JP 2004-359207 A

  However, in the configuration shown in FIG. 6, when the acceleration G received by the vehicle body at the time of the collision is large as in a light vehicle, the forward movement of the occupant at the time of the collision is faster than that of a medium-sized vehicle or a large vehicle. As a result, the occupant's waist may ride on the airbag 32 in some cases. In this case, there is a problem in that the load applied to the chest by the seat belt increases and the amount of deflection of the chest also increases.

  In view of the above-described conventional problems, the present invention provides an automotive seat that can reliably suppress forward movement while reducing the load load and the amount of deflection received by an occupant chest even when the acceleration received by the vehicle body during a vehicle collision is large. The purpose is to provide.

  The automobile seat of the present invention is an automobile seat in which an airbag is disposed at the lower front end of the seat cushion so as to extend in the width direction of the seat cushion, and a means for injecting gas into the airbag during sudden deceleration is provided. In the seat, a plurality of inflatable portions of the airbag are provided in the front-rear direction of the vehicle, and a means for allowing the internal gas to escape outside the inflatable portion is provided in the inflatable portion on the rear side.

  According to this configuration, it is possible to reliably prevent the occupant's lower back from moving forward while sinking due to the expansion of the inflatable portion, so that the initial restraint performance of the chest can be improved and the collision can be prevented. During the middle and late stages, the gas in the inflatable part on the rear side escapes due to the forward movement of the occupant's waist, so the occupant's waist rises high and unnecessary acceleration acts on the chest, causing load load and deflection on the chest. An increase in the amount can be effectively suppressed. In addition, the acceleration acting on the occupant's chest can be adjusted simply by changing the size and position of the holes and openings as a means for escaping the gas to the outside, which is convenient and excellent in cost. The effect that can be demonstrated.

  Further, the airbag is divided into a plurality of inflatable portions by a partition member that breaks at a constant load, and the means for injecting the gas is disposed in the inflatable portion on the rear side, and the means for releasing the gas in the inflatable portion on the rear side If the partition member breaks, it is only necessary to inflate the minimum necessary space of the rear inflated part at the beginning of the collision. In the middle and late stages of the collision, the partition member breaks as much as necessary to absorb the collision energy, and the gas in the rear inflating part is transferred to the front inflating part. Since it flows and expands, unnecessary acceleration is not applied to the occupant's chest, and forward movement can be reliably suppressed while reducing the load load and the amount of deflection that the occupant's chest receives. In addition, since a plurality of inflatable portions can be configured by one airbag and only one means for ejecting gas is required, this is advantageous because it is advantageous in terms of cost and layout.

  In addition, a plurality of inflatable portions of the airbag are configured to communicate with each other, and the means for injecting gas is disposed in the inflatable portion on the front side, and the internal gas is allowed to escape into the vehicle interior in the inflatable portion on the rear side. An opening may be provided, and in this case as well, the forward movement can be reliably suppressed while reducing the load applied and the amount of deflection received by the occupant chest as described above, and a plurality of inflating portions can be combined. Since it can be constituted by an air bag and only one means for ejecting gas is required, it is advantageous in terms of cost and layout.

  According to the automobile seat of the present invention, it is possible to reliably prevent the occupant's waist from moving forward while sinking due to the expansion of the inflatable portion, and to improve the initial restraining performance of the chest. In the middle and late stages of the collision, the occupant's lumbar part moves out by the forward movement of the occupant's lumbar part, so that the occupant's lumbar part rises high and unnecessary acceleration acts on the chest part. There is an effect that it is possible to effectively suppress an increase in the load load and the amount of deflection.

  Hereinafter, each embodiment of the automobile seat of the present invention will be described with reference to FIGS.

(First embodiment)
First, a first embodiment of the present invention will be described with reference to FIGS. In FIG. 1, 1 is a seat cushion of an automobile seat, and 2 is a seat back. The seat cushion 1 is configured by mounting a cushion pad 4 such as urethane foam on the upper part of a frame portion 3 made of steel plate or resin. The outer surface of the cushion pad 4 is covered with an exterior material (not shown). An airbag 5 is disposed between the frame portion 3 and the cushion pad 4 at the lower front end of the seat cushion 1 so as to extend in the width direction of the seat cushion 1.

  The airbag 5 is divided into a plurality of inflating portions 6a and 6b by a partition member 7 that breaks at a constant load, and an inflator 8 that jets gas into the airbag 5 at the time of sudden deceleration is provided on the rear side. Arranged in the expansion portion 6b. Then, when a load or pressure exceeding a certain level is applied to the inflatable portion 6b in a state where the inflatable portion 6b on the rear side is inflated, the partition member 7 is broken and the gas in the inflatable portion 6b is transferred to the inflatable portion 6a on the front side. It is comprised so that the expansion part 6a of the front side may flow and may expand | swell.

  As shown in FIG. 2 (a), the partition member 7 has a predetermined load or more as shown in FIG. 2 (b) even if it is constituted by a sewing thread 7a sewn in the front-rear direction intermediate portion of the airbag 5. It is also possible to use a clip 7b configured so as to be detached at a position where the intermediate portion in the front-rear direction of the airbag 5 is sandwiched by the clip 7b. Further, as shown in FIG. 3 (a), the shape of the airbag 5 itself is such that the front and rear inflating portions 6a and 6b communicate with each other through a narrow communication passage 9, and the communication passage is used. Even if the 9 portion is partitioned by the partition member 7, as shown in FIG. 3B, the airbag 5 forming a single internal space is used, and as shown in FIG. You may partition into the front and back expansion parts 6a and 6b.

  In the above configuration, in the normal state before the collision, as shown in FIG. 1 (a), both the inflating portions 6a and 6b are folded in a flat state, and the cushion pad 4 as a whole has good cushioning and comfortable sitting. good. At the initial stage of the collision, as shown in FIG. 1 (b), the inflator 8 is actuated to inflate the rear inflating portion 6b, and the inflating portion 6b effectively acts to lift the front end of the seat cushion 1 upward. By preventing the occupant's M waist from moving forward, the initial restraint performance of the chest is improved. In the middle and late stages of the collision, as shown in FIG. 1 (c), the partition member 7 breaks when a load of a certain level or more is applied to the rear inflated part 6b as the occupant M moves forward. The gas in the rear inflatable portion 6b flows into the front inflatable portion 6a and the front inflatable portion 6a inflates, effectively acting to prevent the waist from moving forward, and at the same time, the occupant M It is possible to effectively suppress an increase in the load applied to the chest and the amount of deflection due to unnecessary acceleration acting on the chest of the occupant M due to the waist rising high on the inflatable portion 6b.

  As described above, according to the present embodiment, at the initial stage of the collision, the waist portion of the occupant M can be reliably prevented from moving forward while sinking due to the expansion of the rear inflatable portion 6b. Can be improved. In the middle and late stages of the collision, the gas in the rear inflatable portion 6b flows to the inflatable portion 6a on the front side due to the forward movement of the lumbar portion of the occupant M, so that the lumbar portion of the occupant M is placed on the inflatable portion 6b. Riding high and unnecessary acceleration acting on the chest can effectively suppress an increase in the load load and deflection on the chest, and the waist of the occupant M is more in the front inflatable portion 6a. Moving forward can be effectively prevented. Thus, the obstacle value for the chest of the occupant M can be minimized.

  Further, in the configuration of the present embodiment, since it is only necessary to expand the minimum necessary space of only the rear inflating portion 6b at the initial stage of the collision, the front of the occupant M is instantly responded to the quick movement of the occupant M specific to the small vehicle. The movement can be effectively suppressed. In addition, a plurality of inflatable portions 6a and 6b can be configured by a single airbag 5, and only one inflator 8 for ejecting gas is required, which is advantageous in terms of cost and layout, which is preferable. .

(Second Embodiment)
Next, a second embodiment of the automobile seat of the present invention will be described with reference to FIG. In the description of the following embodiment, the same components as those in the preceding embodiment are denoted by the same reference numerals, description thereof will be omitted, and only differences will be described.

  In the present embodiment, as shown in FIG. 4, a single airbag 15 is partitioned into a plurality of front and rear inflating portions 16 a and 16 b by a partition member 17, and both the inflating portions 16 a and 16 b can communicate with each other. The inflator 18 configured to eject gas is disposed in the front-side inflatable portion 16a, and the rear-side inflatable portion 16b is provided with a gas vent hole 19 at a portion facing the gas vent hole 19 in the frame portion 3. In addition, the gas vent hole 20 is formed so that the gas in the inflatable portion 16b can escape into the vehicle compartment. The partition member 17 of the present embodiment is not a member that completely separates and blocks the front and rear inflating portions 16a and 16b, and allows a gas flow, but is preferably a member that generates a flow resistance, and has a communication opening. What sewn so that cloth may be inserted between both expansion parts 16a and 16b is suitable. Further, the airbag 5 as shown in FIG. 3A is applied, an inflator 18 is provided in the inflatable portion 6a on the front side, and a gas vent hole 19 is provided in the inflatable portion 6b on the rear side. Also good.

  Even in such a configuration, in the normal state before the collision, as shown in FIG. 4A, both the inflating portions 16a and 16b are flatly folded, and the cushion pad 4 as a whole is satisfactorily cushioned. Comfortable. At the initial stage of the collision, as shown in FIG. 4 (b), the inflator 18 is actuated so that the front inflating portion 16a first inflates, and the rear portion passes through the communicating portion in which the partition member 17 is disposed. The inflating portion 16b is also inflated, and the inflating portions 16a and 16b effectively act to lift the front end portion of the seat cushion 1 upward and prevent the occupant's M waist from moving forward. Restraint performance is improved. In the middle and late stages of the collision, as shown in FIG. 4C, the front inflating portion 16a effectively operates while inflated, preventing the waist from moving forward, while the rear inflating portion 16b. As the occupant M's waist moves forward, the gas escapes from the vent holes 19 and 20, so that the occupant's M waist rises above the inflatable portion 16b and an unnecessary acceleration acts on the chest of the occupant M. It is possible to effectively suppress an increase in load load and deflection amount on the chest.

  Thus, also in the present embodiment, it is possible to minimize the obstacle value for the occupant's chest. Further, since the plurality of inflating portions 16a and 16b can be constituted by one airbag 15, and only one inflator 18 for ejecting gas is required, it is advantageous in terms of cost and layout. In addition, since the acceleration acting on the chest of the occupant can be adjusted simply by changing the size and position of the gas vent holes 19 and 20, it is advantageous in terms of convenience and cost. be able to.

(Third embodiment)
Next, a third embodiment of the automobile seat of the present invention will be described with reference to FIG.

  In the said embodiment, although the single airbag 5 and 15 was divided by the partition members 7 and 17, the example which comprised the some expansion | swelling part 6a, 6b, 16a, 16b was shown, but in this embodiment, FIG. As shown in FIG. 5, the airbags 25a and 25b, which are independent of each other and provided with inflators 26a and 26b, are arranged in parallel in the front-rear direction, so that the airbags 25a and 25b serve as front and rear inflating parts. In addition, a gas vent hole 27 is provided in the rear airbag 25b, and a gas vent hole 28 is formed in a portion of the frame portion 3 facing the gas vent hole 27 so that the gas in the airbag 25b is brought into the vehicle interior. It is configured so that it can escape.

  Even in such a configuration, in the normal state before the collision, as shown in FIG. 5A, both the airbags 25a and 25b are folded in a flat state, and the cushion pad 4 as a whole is satisfactorily cushioned. Comfortable. At the initial stage of the collision, as shown in FIG. 5 (b), the inflators 26a and 26b are operated to inflate both airbags 25a and 25b, and both the airbags 25a and 25b effectively act to By lifting the front end portion upward and preventing the occupant's M waist from moving forward, the initial restraint performance of the chest is improved. In the middle and late stages of the collision, as shown in FIG. 5 (c), the front airbag 25a effectively operates while inflated, preventing the waist from moving forward, while the rear airbag 25b. As the occupant M's waist moves forward, the gas escapes from the gas vent holes 27, 28, so that the occupant M's waist rises above the airbag 25b and an unnecessary acceleration acts on the chest of the occupant M. It is possible to effectively suppress an increase in the load applied to the chest and the amount of deflection. Thus, also in the present embodiment, it is possible to minimize the obstacle value for the occupant's chest.

  The present invention can improve the initial restraint performance of the chest by reliably preventing the occupant's waist from moving forward while sinking due to the expansion of the inflatable part at the initial stage of the collision, In the latter period, the gas in the inflatable part on the rear side escapes to the outside, the occupant's waist is elevated and the load load on the chest and the amount of deflection can be effectively suppressed. Since the forward movement can be reliably suppressed while reducing the amount of deflection, it is useful for a safety mechanism of an automobile seat.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic structure of 1st Embodiment of the motor vehicle seat of this invention is shown, (a) is a normal time, (b) is the collision initial stage, (c) is a vertical side view which shows the state in the middle and late stage of a collision, respectively. . It is a perspective view of the specific example of the partition member of the embodiment. It is explanatory drawing of the structural example of the expansion part of the embodiment. The schematic structure of 2nd Embodiment of the motor vehicle seat of this invention is shown, (a) is a normal time, (b) is the collision initial stage, (c) is a vertical side view which each shows the state in the middle and late stage of a collision. . The schematic structure of 3rd Embodiment of the motor vehicle seat of this invention is shown, (a) is a normal time, (b) is a collision initial stage, (c) is a vertical side view which shows the state in the middle and late stage of a collision, respectively. . It is a vertical side view which shows schematic structure of the vehicle seat of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seat cushion 5, 15, 25a, 25b Air bag 6a, 6b, 16a, 16b Inflating part 7, 17 Partition member 8, 18, 26a, 26b Inflator (means to inject gas)
19, 20, 27, 28 Gas vent holes

Claims (3)

  An inflatable portion of an air bag in which an air bag is disposed at a lower portion of the front end of the seat cushion so as to extend in the width direction of the seat cushion, and a means for injecting gas into the air bag at the time of sudden deceleration is provided. A vehicle seat characterized in that a plurality of the vehicle seats are provided in the vehicle front-rear direction, and a means for escaping internal gas to the outside of the expansion part is provided in the expansion part on the rear side.   The airbag is partitioned into a plurality of inflatable portions by a partition member that breaks at a constant load, the means for injecting gas is disposed in the inflatable portion on the rear side, and the means for releasing the gas in the inflatable portion on the rear side is a partition. The automobile seat according to claim 1, wherein the member is allowed to escape to an inflated portion on the front side by breaking the member.   A plurality of inflatable portions of the airbag are configured to communicate with each other, and a means for ejecting gas is provided in the inflatable portion on the front side, and an opening for allowing the gas inside to escape into the vehicle interior is provided in the inflatable portion on the rear side. The automobile seat according to claim 1, wherein the automobile seat is provided.

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