JP2019034674A - Lower limb restraint airbag device with seat - Google Patents

Abstract

An object of the present invention is to provide a seat-equipped lower-limb restraint airbag device capable of effectively restraining the lower limbs of an occupant in the event of a vehicle collision. A vehicle seat (12) is provided on one side in the seat width direction with respect to a seat cushion (14), and is inflated and deployed so as to cover the front surface of the lower legs of a seated occupant (P) from the one side to the other side. and a rod-shaped first bag 20 extending across the first bag 20 and the other side portion. and a second bag 22 that suppresses the [Selection drawing] Fig. 1

Description

  The present invention relates to a leg-constrained airbag device with a seat.

  2. Description of the Related Art Conventionally, a vehicle knee airbag device that receives a reaction force from an instrument panel or a steering column and restrains a lower limb of a seated occupant (hereinafter simply referred to as “occupant”) is known.

  Here, in recent years, the instrument panel has been reduced in size due to a request to increase the space in the vehicle interior. In this case, since the lower limbs of the occupant move away from the instrument panel, it is necessary to enlarge the knee airbag of the vehicle knee airbag device in the vehicle front-rear direction.

  Furthermore, with the recent automatic driving of passenger cars, a mode in which the vehicle seat is rotated in the front-rear direction is also assumed. In this case, the knee airbag cannot receive a reaction force from an instrument panel or the like and loses the reaction force surface. Therefore, it is desired to create a seat-attached lower limb restraint airbag device that does not require a reaction force on an instrument panel, a steering column, etc., but can independently secure a reaction force and restrain an occupant's lower limb.

  Based on the above background, whether or not the airbag apparatus described in Patent Document 1 below can be applied will be examined below. In this prior art, an abdominal airbag is incorporated at the left and right ends of the seat surface of the seat. In this airbag apparatus with a seat, when the pair of airbags are inflated and deployed, the pair of airbags abut each other through the joint surface on the front side of the abdomen of the occupant. And a pair of airbags are joined by the surface fastener etc. which were previously provided in the said joint surface, and a passenger | crew is restrained by covering a passenger | crew's abdomen.

JP2013-018378A

  However, in the prior art described in Patent Document 1, when a load on the front side of the seat is input to a pair of airbags from an occupant who intends to move inertia during a frontal collision, the joint surfaces are peeled off and the pair of airbags It is conceivable that a combined state cannot be obtained. In other words, it is very difficult to maintain the coupled state of the pair of left and right airbags, and further improvement is considered necessary to sufficiently restrain the occupant's lower limbs.

  In consideration of the above facts, an object of the present invention is to provide a seat-attached lower limb restraining airbag device that can sufficiently restrain an occupant's lower limb at the time of a vehicle collision.

  The seat-attached lower limb restraint airbag device according to the first aspect of the present invention is provided on one side of the seat cushion of the vehicle seat in the seat width direction and covers the front surface of the lower limb of the seated occupant by inflating and deploying. In this way, the rod-shaped first bag extending from the one side portion to the other side portion is provided on the other side portion, and the first bag is engaged in the inflated and deployed state. A second bag that suppresses the movement of the one bag from the position at the time of inflating and deploying in the direction of the inertial force.

  In the first aspect of the present invention, the first bag is provided on one side of the seat cushion in the seat width direction. The first bag extends in a rod shape from the one side to the other side so as to cover the front surface of the lower limb of the seated occupant by inflating and deploying. On the other hand, a second bag is provided on the other side, and the first bag is engaged in an inflated and deployed state. And by this 2nd bag, it is suppressed that a 1st bag moves to the action direction of an inertia force from the position at the time of expansion | deployment deployment. Thus, even when a load is input from the lower limb portion to the first bag due to inertial movement of the seated occupant during a vehicle collision, the reaction force is received from the second bag, so that the occupant's lower limb can be restrained by the first bag.

  As described above, according to the seat-equipped lower limb restraint airbag device according to the present invention, the occupant's lower limb can be restrained sufficiently at the time of a vehicle collision.

It is a perspective view which shows the vehicle seat provided with the lower limb restraint airbag device with a seat concerning a 1st embodiment in the state where the said lower limb restraint airbag device with a seat operated. It is a top view of the vehicle seat in the state before the lower limb restraint airbag device with a seat shown in FIG. 1 operates. (A) is a schematic plan view of the seat-attached lower limb restraint airbag device showing a state when the first bag is inflated with a solid line and a state when the second bag is inflated with a two-dot chain line, (B) It is a schematic side view of the seat-equipped lower limb restraint airbag device in which the state when the second bag is inflated is indicated by a solid line and the state when the first bag is inflated is indicated by a two-dot chain line. (A) is a schematic diagram showing an enlarged state before two coat base fabrics overlap, and (B) is a schematic diagram showing an enlarged state after two coat base fabrics overlap. . (A) is a partial enlarged plan view showing the uneven shape of the friction surface of the coated base fabric shown in FIG. 4 (A), and (B) to (E) are deformations of the uneven shape of the friction surface of the coated base fabric. It is a partial enlarged plan view which shows an example, respectively. It is a perspective view corresponding to Drawing 1 which shows the seat for vehicles provided with the leg restraint airbag device with a seat concerning a 2nd embodiment in the state where the said leg restraint airbag device with a seat operated. It is a principal part perspective view corresponding to FIG. 1 which shows the vehicle seat provided with the leg | limb restraint airbag apparatus with a seat which concerns on 3rd Embodiment in the state which the said leg leg restraint airbag apparatus with a sheet | seat act | operated. It is a principal part perspective view corresponding to FIG. 1 which shows the vehicle seat provided with the leg-constrained airbag apparatus with a seat which concerns on 4th Embodiment in the state which the said leg-constrained airbag apparatus with a sheet | seat act | operated.

<First Embodiment>
Hereinafter, the seated lower limb restraint airbag device 10 according to the first embodiment will be described with reference to FIGS. Note that an arrow FR appropriately shown in the drawings indicates the vehicle front side, an arrow UP indicates the vehicle upper side, and an arrow OUT indicates the vehicle width direction outer side. In addition, when simply using the front / rear, up / down, and left / right directions, unless otherwise specified, the front / rear direction of the vehicle, the up / down direction of the vehicle / up / down direction, and the left / right direction of the front / rear direction of the vehicle are shown And

(Configuration of lower limb restraint airbag device)
As shown in FIGS. 1 and 2, a seat-equipped lower limb restraint airbag device 10 (hereinafter simply referred to as “airbag device 10”) according to the present embodiment is mounted on a vehicle seat 12. The air bag modules 32L and 32R, the first bag 20, the second bag 22, and inflators 24L and 24R as gas supply means are configured.

  The vehicle seat 12 supports the occupant's waist L (here, including the buttocks) and the thigh D, and the rear end of the seat cushion 14 so as to be tiltable and support the occupant's back B. And a headrest 18 that is provided at the upper end of the seatback 16 so as to be vertically movable and supports the head H of the occupant. The vehicle seat 12 serves as a passenger seat of a right-hand drive vehicle. Further, in the present embodiment, the seat front-rear direction of the vehicle seat 12 matches the vehicle front-rear direction, and the seat width direction of the vehicle seat 12 matches the vehicle width direction. Unless otherwise specified, in this embodiment, the vehicle direction and the seat direction are the same.

  Supplementally, each figure shows a state where a crash test dummy (doll) is seated on the seat cushion 14 of the vehicle seat 12 as a model of an occupant to be protected. The dummy is seated in a standard seating posture determined by the collision test method, and the vehicle seat 12 is located at a reference setting position corresponding to the seating posture. Hereinafter, the dummy is regarded as an occupant and referred to as “occupant P”.

  The above-described seat cushion 14 of the vehicle seat 12 includes a seat cushion frame (not shown) supported so as to be slidable in the vehicle front-rear direction with respect to the vehicle body floor, a seat cushion pad (not shown) supported by the seat cushion frame, And a seat cushion skin 30 covering the surface of the seat cushion pad.

  Here, on the front end side of both side surfaces of the seat cushion skin 30 in the seat width direction, a skin cleaving portion (not shown) that is broken and cleaved by the action of a predetermined bag inflation pressure is formed. In the seat cushion pad, airbag modules 32L and 32R are accommodated on the seat rear side of the skin cleaving portion. The left airbag module 32L as viewed from the occupant P stores a first bag 20 (described later) in a folded state, and also supplies an inflator 24L that supplies gas to the first bag 20 and a cylindrical shape that is a rectifier. A diffuser (not shown) and the like are accommodated. On the other hand, the right airbag module 32R as viewed from the occupant P stores a second bag 22 (described later) in a folded state, and also supplies an inflator 24R for supplying gas to the second bag 22 and a cylinder as a rectifying means. A diffuser (not shown) or the like is accommodated.

  Incidentally, a stud bolt 36L is erected from the diffuser disposed on the left side when viewed from the occupant P, and the stud bolt 36L is nut-tightened to the left side frame of the seat cushion frame described above. The module 32L is attached to the left side frame. Similarly, a stud bolt 36R is erected from the diffuser arranged on the right side when viewed from the occupant P, and the stud bolt 36R is nut-tightened to the right side frame of the seat cushion frame described above. The bag module 32R is attached to the right side frame.

  As shown in FIG. 2, the inflators 24L and 24R described above are electrically connected to an ECU 26 mounted on the vehicle. The ECU 26 is also electrically connected to a collision detection sensor (not shown) that detects a vehicle collision. In addition, as a collision detection sensor, the acceleration sensor etc. which detect the acceleration of a vehicle can be utilized, for example. The ECU 26 determines whether or not the vehicle has collided based on a detection signal from a collision sensor (not shown). When it is determined that the vehicle has collided, the inflators 24L and 24R are operated. The ECU 26 may be electrically connected to a collision prediction sensor such as a pre-crash sensor that predicts a vehicle collision, or both the collision detection sensor and the collision prediction sensor may be electrically connected. Good.

  When the inflators 24L and 24R are operated, gas is ejected from a gas ejection portion (not shown) provided at the end of each inflator. Thereby, gas is supplied to the 1st bag 20 and the 2nd bag 22 via the diffuser which is not illustrated.

  Here, in this embodiment, the timing at which gas is supplied from the inflators 24L and 24R to the first bag 20 and the second bag 22 by electrical control in the ECU 26 is set. Specifically, the gas is supplied to the first bag 20 prior to the second bag 22. For this reason, the second bag 22 is completely inflated later than the first bag 20. That is, after the first bag 20 is inflated and deployed so as to cover the front surface of the lower limbs of the occupant P, the second bag 22 is inflated and deployed so as to wrap around the second straight portion 48 constituting the first bag 20, One bag 20 is engaged. The first bag 20 and the second bag 22 may be inflated and deployed at the same time, or the second bag 22 may be inflated and deployed first.

  Next, the first bag 20 and the second bag 22 will be described in detail.

  As shown in FIG. 1 and FIG. 3 (A), the first bag 20 is configured as a bottomed cylindrical bag body whose longitudinal end is closed. That is, the base end portion in the longitudinal direction of the first bag 20 is opened to be an open end portion 40, and the distal end portion in the longitudinal direction is closed to be a closed end 42. The inflator 24L is inserted from the opening end 40 of the first bag 20, and the opening end 40 together with the inflator 24L is fastened to the left side frame of the seat cushion frame.

  Further, the first bag 20 is structurally configured such that a first straight portion 44 that extends a predetermined length from the side surface of the seat cushion 14 in the seat width direction to the front side of the seat, and the front side of the seat cushion 14 in the front-rear direction of the seat A quadrant that connects the second straight portion 48 extending substantially parallel to the front surface of the first straight portion 44, the front end portion of the first straight portion 44 and the end portion of the second straight portion 48 on the outer side in the sheet width direction. When the inflated and deployed state is viewed in a plan view, it forms a substantially L-shaped rod-like body. Thus, when the first bag 20 is viewed from the front side of the seat, the second straight portion 48 is disposed so as to overlap the lower leg of the occupant P.

  Moreover, the length of the longitudinal direction of the 2nd linear part 48 in the 1st bag 20 mentioned above is formed longer than the sheet | seat width. Therefore, when the first bag 20 in the inflated and deployed state is viewed from the front side of the seat, the right end of the second linear portion 48 in the seat width direction (the closed end 42) protrudes from the right side of the seat cushion 14 in the seat width direction. ing.

  On the other hand, as shown in FIGS. 1 and 3B, the second bag 22 is stored in a state of being folded in the right airbag module 32 </ b> R as viewed from the passenger P. In addition to the second bag 22, the airbag module 32R stores an inflator 24R, a diffuser (not shown), and the like.

  In the inflated and deployed state, the second bag 22 is formed in a substantially C shape with the vehicle rear lower side opened in a side view. Further, a flat portion 68 extending in the seat vertical direction and the seat width direction is provided at the front portion of the inner peripheral portion 58 of the second bag 22. Further, the base end portion in the longitudinal direction of the second bag 22 is opened to be an open end portion 54, and the distal end portion in the longitudinal direction is closed to be a closed end 56.

  In a state where the first bag 20 and the second bag 22 are inflated and deployed, the second straight portion 48 of the first bag 20 is disposed in a state of penetrating the center portion of the second bag 22. In this state, the above-described flat portion 68 is disposed substantially in parallel with the side surface 52 on the front side of the seat at the closed end 42 of the first bag 20. Due to this through arrangement, the first bag 20 is engaged with the second bag 22, and even if the second straight portion 48 of the first bag 20 is pressed to the front side of the seat, the second straight portion 48 is provided. Is kept engaged with the second bag 22 so that the second linear portion 48 does not come off the second bag 22.

  The first bag 20 and the second bag 22 described above are made of nylon 66 or polyester material.

  Here, when viewed from the front side of the seat, the coat base fabric 60 is disposed at a portion where the second straight portion 48 of the first bag 20 and the second bag 22 intersect. The coat base cloth 60 includes a coat base cloth 60A on the first bag 20 side and a coat base cloth 60B on the second bag 22 side, each cut into a rectangular shape. These coated base fabrics 60A and 60B are fabrics in which a silicone rubber or the like is coated on the same fabric material as the airbag base fabric, and a bonding surface 66 that is not coated with a silicone rubber and the like, and a silicone rubber or the like is coated. And a friction surface 64.

  The coat base fabric 60A is joined to the side surface 52 on the front side of the seat in the second linear portion 48 of the first bag 20 by sewing or the like. The coat base fabric 60 </ b> A is set in a range from the upper surface 50 of the second linear portion 48 to the lower surface 53 via the side surface 52. On the other hand, the coat base fabric 60B is joined to the flat portion 68 of the second bag 22 by sewing or the like. More specifically, the coat base fabric 60 </ b> B extends beyond the flat portion 68 to the upper front side and the lower front side of the inner peripheral portion 58 of the second bag 22. The coat base fabric 60A of the first bag 20 and the coat base fabric 60B of the second bag 22 described above are configured such that the friction surfaces 64 come into contact with each other when the second straight portion 48 is pressed toward the front side of the seat. ing. Note that the second bag 22 may be configured not to include the flat portion 68.

  As shown in FIGS. 4A and 4B, the above-described friction surface 64 is provided with a concavo-convex shape, and the first bag 20 and the second bag 22 are inflated and deployed at the contact portion 59. The concave and convex shapes of the friction surface 64 of the coat base fabric 60A and the friction surface 64 of the coat base fabric 60B are overlapped and fitted.

  As shown in FIG. 4A, in the present embodiment, a plurality of convex portions 62 are repeatedly formed at predetermined intervals on each friction surface 64. Each convex part 62 has a strip shape and is arranged so as to be substantially parallel to each other with a predetermined interval. Therefore, the friction surface 64 has a striped uneven shape (see FIG. 5A). However, the width of the convex portion 62 is set to be narrower than the width of the concave portion 63. In the contact portion 59, the convex portion 62 is fitted into the concave portion 63.

  In addition, the uneven | corrugated shape of the coat base fabric 60 is not restricted to stripe shape, Various shapes can be employ | adopted. For example, as shown in FIGS. 5B to 5E, a horizontal stripe shape, a mountain shape, a wave shape, a zigzag shape, or the like may be used. In addition, the range and size in which the coat base fabrics 60A and 60B are joined may be appropriately set in consideration of the arrangement relationship of the first bag 20 and the second bag 22, and the like.

(Action and effect)
Next, the operation and effect of this embodiment will be described.

  In the airbag apparatus 10 of the present embodiment, when various sensors (not shown) detect or predict a vehicle collision, the inflators 24L and 24R are operated by the ECU 26 to generate gas. Then, gas ejected from the inflators 24L and 24R flows to the first bag 20 and the second bag 22 through a diffuser (not shown). Here, first, gas is supplied to the first bag 20 to expand and develop. As shown in FIG. 3A, the first bag 20 extends in a rod shape from the left side to the right side of the seat cushion 14 in the seat width direction. Thereby, the front surface of the lower limb of the occupant P is covered.

  Next, gas is supplied to the second bag 22, and the second bag 22 is inflated and deployed. The second bag 22 is inflated and deployed so as to be wound from the rear of the seat with respect to the distal end portion (closed end 42) of the second linear portion 48 constituting the first bag 20. That is, the second straight portion 48 of the first bag 20 passes through the central portion of the second bag 22, and the first bag 20 is engaged with the second bag 22. Even when the lower limb of the occupant P who intends to move inertially presses the first bag 20 toward the front of the seat at the time of a vehicle collision, the state where the second straight portion 48 is engaged with the second bag 22 is maintained. The second straight portion 48 does not come off the second bag 22. Therefore, the lower limb of the occupant P can be firmly restrained by receiving a reaction force from the second bag 22.

    Further, at the portion where the first bag 20 and the second bag 22 intersect (the contact portion 59), the coat base fabrics 60A and 60B contact each other and have higher friction than the other portions of the first bag 20 and the second bag 22. Set to a coefficient. Thereby, the reaction force which the 1st bag 20 receives from the 2nd bag 22 can be improved.

  In addition, the first bag 20 is inflated from the left side to the right side in the seat width direction of the seat cushion 14 so as to cover the front of the lower limbs of the occupant P, thereby protecting the lower limbs of the occupant P from a collision body or the like. can do.

  Furthermore, in the present embodiment, a flat portion 68 is formed on the inner peripheral portion 58 of the second bag 22. When the second bag 22 is inflated and deployed, the flat surface portion 68 is disposed substantially parallel to the seat front side surface 52 at the closed end 42 of the first bag 20 and contacts the seat front side surface 52. Therefore, the area where the first bag 20 and the second bag 22 are in contact with each other is enlarged. Thereby, the frictional force in the contact part 59 can be increased and the reaction force can be effectively received from the second bag 22.

  Further, in this embodiment, since the expansion of the second bag 22 is completed later than the first bag 20, compared to the case where the second bag 22 is expanded at the same time, the first bag 20 is located at a position different from the engagement position, that is, the first bag 20. 2 Inflating and deploying outside the bag 22 is prevented. Thereby, the 2nd bag 22 can be engaged with the 1st bag 20 stably.

  Furthermore, the airbag device 10 is provided on the vehicle seat 12 and can restrain the limb of the occupant P without depending on other configurations provided inside the vehicle. Thereby, compared with the case where a knee airbag is provided in the instrument panel and the steering column in the vehicle interior, space saving and cost reduction can be achieved, and the degree of freedom in designing the vehicle interior can be increased.

  Moreover, since the 1st bag 20 and the 2nd bag 22 of this embodiment are accommodated between the side surface of a seat cushion pad, and the seat cushion skin 30, the design property of the vehicle seat 12 is improved.

Second Embodiment
Next, based on FIG. 6, a seated lower limb restraint airbag device 70 according to a second embodiment will be described.

  As shown in FIG. 6, in the seated lower limb restraint airbag device 70 of the present embodiment, a first bag 72 is provided on the left side of the seat cushion 14 in the seat width direction. On the other hand, a second bag 74 is provided on the right side of the seat cushion 14 in the seat width direction. Each of the first bag 72 and the second bag 74 is configured as a bottomed cylindrical bag body whose front end in the longitudinal direction is closed. An inflator (not shown) as a means for supplying gas is inserted from each opening end of the first bag 72 and the second bag 74, and is inflated and deployed by receiving gas supply from the inflator at the time of a vehicle collision.

  The first bag 72 and the second bag 74 in the inflated and deployed state form a substantially L-shaped rod-like body in a plan view and are shaped like a pair of arms. In other words, the first bag 72 extends from the left side of the seat cushion 14 in the seat width direction to the front of the seat, and then extends linearly to the right in the seat width direction. The second bag 74 extends from the right side of the seat cushion 14 in the seat width direction to the front of the seat, and then extends linearly from there to the left side in the seat width direction. And then. When viewed from the front of the seat, the second bag 74 is overlapped in front of the first bag 72. A sheet-like coat base cloth 60 cut into a rectangular shape is joined to the portion where the first bag 72 and the second bag 74 overlap each other by sewing or the like, and the friction surfaces of these coat base cloths 60 are bonded to each other. It is comprised so that it may contact | abut. Thereby, even if the 1st bag 72 is pressed to the seat front side, the state engaged with the 2nd bag 74 is maintained, and the movement from the position at the time of the expansion | swelling in the 1st bag 72 is suppressed. It has become.

(Function and effect)
In the lower limb restraint airbag device 70 with the seat of the present embodiment, first, the first bag 72 is inflated and deployed from the left side in the seat width direction of the seat cushion 14 so as to cover the front surface of the lower limb of the occupant P at the time of vehicle collision. It extends in a rod shape toward the right side. Next, the second bag 74 is inflated and deployed, extends in a rod shape from the right side portion in the seat width direction of the seat cushion 14 toward the left side portion, and is superposed on the first bag 72 from the front of the seat. That is, the 1st bag 72 and the 2nd bag 74 become a pair of arm shape, and restrain crew member P's leg from the seat front. Further, even when the lower limb of the occupant P who is about to move inertially presses the first bag 72 toward the front of the seat at the time of a vehicle collision, a frictional force is generated by the coat base fabric 60 and is engaged with the second bag 74. Maintain the state. Accordingly, a reaction force is received from the second bag 74. Thereby, the restraint state of the lower limb of the occupant P by the first bag 72 is firmly maintained, and the inertial movement of the occupant P can be prevented or suppressed.

<Third Embodiment>
Next, a seated lower limb restraint airbag device 80 according to a third embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about the structure similar to 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIG. 7, in the seated leg restraining airbag device 80 of the present embodiment, the second bag 82 provided on the right side of the seat cushion 14 has a substantially rectangular plate shape in a side view in the seat width direction. The cushion body is inflated and deployed. Then, in a side view in the seat width direction, an insertion hole 84 that penetrates in the seat width direction is formed substantially at the center of the second bag 82. In the inflated and deployed state of the first bag 20 and the second bag 82, the insertion portion 84 is disposed so that the straight portion 48 of the first bag 20 passes through the insertion hole 84. Due to this through arrangement, the first bag 20 is engaged with the second bag 82, and even if the first bag 20 is pressed to the front side of the seat, the second straight portion 48 is brought into contact with the second bag 82. The engaged state is maintained, and the second linear portion 48 is prevented from being detached from the second bag 82. It should be noted that a coat base cloth (not shown) is joined to each portion where the first bag 20 and the inner peripheral edge 86 of the insertion hole 84 intersect to improve the friction coefficient of the portion where the first bag 20 and the second bag 82 abut. May be.

(Function and effect)
In the leg-constrained airbag device 80 with seat according to the present embodiment, first, the second bag 82 is inflated and deployed at the time of a vehicle collision. Next, when the first bag 20 is inflated and deployed, the straight portion 48 of the first bag 20 is inserted into the insertion hole 84 of the second bag 82. Thereby, the front surface of the lower limb of the occupant P is covered. Further, even when the lower limb of the occupant P who is about to move inertially presses the first bag 20 toward the front of the seat at the time of a vehicle collision, the state in which the second straight portion 48 is engaged with the second bag 82 is maintained. The Accordingly, a reaction force is received from the inner peripheral surface of the insertion hole 84 constituting the second bag 82. Thereby, the restraint state of the lower limb of the occupant P by the first bag 20 is firmly maintained, and the inertial movement of the occupant P is prevented or suppressed. Moreover, if the coat base cloth which is not shown in figure is joined to the site | part which the 1st bag 20 and the inner periphery 86 of the insertion hole 84 cross | intersect, the reaction force received from the inner peripheral surface of the insertion hole 84 can further be improved.

<Fourth embodiment>
Next, a seated lower limb restraint airbag device 90 according to a fourth embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about the structure similar to 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIG. 8, the seat-attached lower limb restraint airbag device 90 according to the present embodiment is characterized in that the second bag 92 is inflated and deployed in a hollow conical shape to engage with the first bag 20. Specifically, the second bag 92 of the present embodiment is provided on the right side of the seat cushion 14 in the seat width direction. The second bag 92 includes a main body portion 96 formed of a bag body, and the main body portion 96 expands and develops into a hollow conical shape that opens to the left in the sheet width direction and protrudes to the right in the sheet width direction. In the inflated and deployed state of the first bag 20 and the second bag 92, the closed end 42 of the first bag 20 is inserted into the main body portion 96 and is in contact with the inner peripheral surface of the main body portion 96. Yes. As a result, the first bag 20 is engaged with the second bag 92, and even if the first bag 20 is pressed forward of the seat, the closed end 42 is engaged with the second bag 92. The state is maintained, and the closed end 42 is prevented from being detached from the second bag 92. A portion where the first bag 20 and the second bag 92 are in contact with each other by joining a coat base fabric (not shown) to a portion where the inner peripheral surface of the main body 96 constituting the first bag 20 and the second bag 92 contacts. The friction coefficient may be improved.

(Function and effect)
In the seated lower limb restraint airbag device 90 of the present embodiment, first, the second bag 92 is inflated and deployed at the time of a vehicle collision. Next, the closed end 42 of the first bag 20 is inserted into the main body portion 96 of the second bag 92 by inflating and deploying the first bag 20. Thereby, the front surface of the lower limb of the occupant P is covered. Further, even when the lower limb of the occupant P who intends to move inertially presses the first bag 20 toward the front of the seat at the time of a vehicle collision, the state where the closed end 42 is engaged with the second bag 92 is maintained. Accordingly, a reaction force is received from the inner peripheral surface of the main body portion 96 constituting the second bag 92.
Thereby, the restraint state of the lower limb of the occupant P by the first bag 20 is firmly maintained, and the inertial movement of the occupant P is prevented or suppressed. In addition, if a coat base cloth (not shown) is joined to a portion where the first bag 20 and the inner peripheral surface of the main body portion 96 abut, the reaction force received from the inner peripheral surface of the main body portion 96 can be further improved.

  The first to fourth embodiments according to the present invention have been described above, but the present invention is not limited to such embodiments, and can be implemented in various modes without departing from the gist of the present invention. Of course you get. For example, in the present embodiment, the first bag and the second bag are in contact with each other by being inflated and deployed, but the present invention is not limited to this. For example, it is good also as a structure which arrange | positions the 1st bag and the 2nd bag near at the time of expansion | deployment, and contact | abuts to a 2nd bag immediately after a 1st bag deform | transforms by the passenger | crew's P inertial movement.

  Further, in the first embodiment and the second embodiment, at the time of inflating and deploying, the coated base fabric 60 having an uneven shape is joined to a portion where the first bag and the second bag abut, and the friction coefficient is obtained by superimposing these. It is improving. However, the present invention is not limited to this. For example, by providing a base fabric with a rough surface at the abutting part to improve the coefficient of friction, or by directly applying a synthetic resin material or the like to the airbag base cloth, the abutting part is made to have a high viscosity and high elasticity. By doing so, the friction coefficient may be improved.

  Moreover, in 1st Embodiment-4th Embodiment, although the sheet | seat front-back direction of the vehicle seat 12 and the vehicle front-back direction corresponded in the state corresponded to the case where the vehicle collided front, it is not restricted to this, This is also effective when the vehicle collides rearward in a state where the front-rear direction of the vehicle seat 12 and the front-rear direction of the vehicle are reversed, that is, when the occupant is seated on the vehicle seat 12 and faces the rear of the vehicle.

DESCRIPTION OF SYMBOLS 10 Seat lower limb restraint airbag apparatus 12 Vehicle seat 14 Seat cushion 20 First bag 22 Second bag 70 Seat lower limb restraint airbag apparatus 72 First bag 74 Second bag 80 Seat lower limb restraint airbag apparatus 82 Second Bag 90 Seat with lower limb restraint airbag device 92 Second bag P Crew (seat occupant)

Claims (1)

Provided on one side of the seat cushion of the vehicle seat in the seat width direction, and extends from the one side to the other side so as to cover the front of the lower limb of the seated occupant by inflating and deploying A rod-shaped first bag;
A second bag which is provided on the other side and is engaged with the first bag in an inflated and deployed state, and suppresses the first bag from moving from the position during the inflated and deployed in the direction of the inertial force. ,
A leg restraint airbag device with a seat.