JP2015093603A - Front seat air bag device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a front seat air bag device which does not require a significant increase in the performance of a gas generating device and is deployed in a region to sufficiently cover a head part of an occupant in a head-on collision accompanying acceleration in a lateral direction of a vehicle.SOLUTION: A front seat air bag device 10 for a vehicle includes: three independent bag bodies 12 including a central bag body 12a and lateral bag bodies 12b, 12c provided on the right and left of the central bag body 12a; a gas generating device 14; and a gas supply control device 16 which supplies an inflation gas from the gas generating device 14 only to the central bag body 12a in a head-on collision which does not accompany acceleration in a lateral direction of a vehicle and supplies the inflation gas to the central bag body 12a and only to the lateral bag body on a collision side out of the right and left lateral bag bodies 12b, 12c in a head-on collision accompanying acceleration in the lateral direction of the vehicle. A significant increase in the performance of the gas generating device 14 is not required since only two bag bodies are inflated and deployed, and the bag bodies are deployed in a region where a head part of an occupant can be sufficiently covered and can be supported from a back surface by a deployment tip end part in the head-on collision accompanying the acceleration in the lateral direction of the vehicle.

Description

  The present invention relates to a front seat airbag device for a vehicle, and more particularly to a front seat airbag device capable of effectively suppressing lateral movement of a passenger to a collision side during a frontal collision involving acceleration in the vehicle lateral direction.

  Patent Document 1 discloses a front seat airbag device having a bag body in the left-right direction of the vehicle and having a central portion of the left and right bag bodies connected to each other. A space formed between the left and right bag bodies serves as a guide, and guides the occupant head that has moved in the left-right direction of the vehicle due to the collision condition to the center of the airbag.

  Patent Literature 2 discloses a front seat airbag device including two airbags, a steering airbag and an auxiliary airbag. The auxiliary airbag is deployed in a space in front of the driver at the time of a collision in which the vehicle lateral displacement or angle change of the steering wheel exceeds a predetermined value.

Japanese Patent No. 4400188 JP 2013-47026 A

  However, in a collision mode in which only the left front surface or the right front surface in the vehicle left-right direction of the vehicle front surface is in contact with the harmful object, the vehicle rotates around an axis about the vertical direction of the collision portion. When moving forward due to inertia, the center position of the airbag and the center position of the occupant may deviate in the vehicle left-right direction.

  In the case of dealing with this positional shift with the prior art of Patent Document 1, since the left and right bags are simultaneously deployed, there is a limit to the volume in which the bags can be deployed, and thus the range in which the passenger's head can be protected. In particular, when a collision occurs at a high speed in a very narrow area in front of the vehicle, the head of the occupant may move to the interior of the door or the front side of the anti-collision side occupant seat. The device may not be able to sufficiently cover the passenger head.

  On the other hand, when the conventional technology of Patent Document 2 is used, in order to deploy an auxiliary airbag having a volume comparable to that of an existing steering airbag, it is necessary to significantly increase the performance and capacity of the gas generator.

  The object of the present invention can be deployed in a range that can sufficiently cover an occupant's head at the time of a frontal collision involving acceleration in the lateral direction of the vehicle without requiring a significant increase in performance and capacity of the gas generator, and It is an object to provide an air bag device for a front seat of a vehicle that can enhance the head holding force.

  A vehicle front seat airbag device (hereinafter referred to as “vehicle front seat airbag device” simply referred to as “front seat airbag device”) of the present invention that achieves the above object has the following configuration. Can do. In addition, the code | symbol with a parenthesis respond | corresponds to the member number which appears in drawing.

  In the first configuration of the present invention, the front seat airbag device (10) includes a central bag body (12a) and side bag bodies (12b, 12c) provided on the left and right sides of the central bag body (12a). Including three independent bags (12), a gas generator (14), and a gas for expansion from the gas generator (14), the central bag (12a) during a frontal collision without acceleration in the lateral direction of the vehicle Gas supply control for supplying only to the side bag on the collision side of the central bag (12a) and the left and right side bags (12b, 12c) at the time of a frontal collision with acceleration in the vehicle lateral direction. An apparatus (16).

  In the second configuration of the present invention, the left and right side bag bodies (12b, 12c) in the inflated and deployed state of the central bag body (12a) and the left and right side bag bodies (12b, 12c) in the first configuration. ) Are set larger than the thickness h1 of the central bag (12a), and the pressures p2 and p3 of the left and right side bags (12b, 12c) are the pressure p1 of the central bag (12a). It is set larger.

  In the third configuration of the present invention, in the first configuration or the second configuration described above, the gas supply control device (16) is configured to center the side bag on the collision side at the time of a frontal collision with acceleration in the lateral direction of the vehicle. It is comprised so that expansion | deployment may be completed before a bag body (12a).

According to the first configuration, the following effects can be obtained.
At the time of a frontal collision without vehicle lateral acceleration, only the central bag body is inflated and deployed, and the central bag body restrains and protects an occupant who moves inertially as before.
At the time of a frontal collision with acceleration in the lateral direction of the vehicle, the two bags, the central bag and the side bag on the collision side only, are inflated and deployed, restraining the occupant who moves inertially forward by both bags, Protect.

  In this case, in the frontal collision with acceleration in the vehicle lateral direction, in the collision on the side closer to the occupant, only the central side bag body and the side bag body on the collision side among the left and right side bag bodies are inflated and deployed. As compared with the case where the side bag body is inflated and deployed, the side bag body can be sufficiently deployed in a range in which the occupant head can be sufficiently covered, and the movement of the occupant toward the door can be suppressed. In addition, since the front end portion of the side bag body on the collision side can reach the door trim and is supported by the door trim from the side opposite to the occupant, the side bag body on the collision side is compared with the case where it does not reach the door trim. The head holding power can be increased.

  Also, in the collision on the side far from the occupant, only the central bag body and the side bag body on the collision side among the left and right side bag bodies are inflated and deployed, so that both the left and right side bag bodies are inflated and deployed. In addition, the vehicle can be deployed in a range that can sufficiently cover the head of the occupant, and the movement of the occupant toward the center in the vehicle width direction can be suppressed. In addition, the deployment side tip of the side bag body on the collision side can reach the instrument panel and is supported by the instrument panel from the opposite side of the occupant, so compared to the case where it does not reach the instrument panel The head holding force of the side bag body on the side can be increased.

  When the side bag on the collision side is supported by the door trim or instrument panel from the opposite side of the occupant, the capacity of the bag is larger than when the occupant is supported by the bag that is not supported by the door trim or instrument panel. There is no need to increase the output of the gas generator.

  According to the second configuration, since h2, h3> h1 and p2, p3> p1 are set, when the occupant hits the inflated and deployed bag body, the occupant is guided to the central bag body side, Sideward movement to the collision side can be effectively suppressed. As a result, it is possible to suppress the possibility that the occupant's head comes off the auxiliary airbag and comes into contact with the door trim or the instrument panel, which is present in the conventional airbag device.

  According to the 3rd structure, since the side bag body by the side of a collision is completed deployment ahead of a center bag body, a passenger | crew's side movement can be suppressed more effectively.

The upper column of the airbag device for the front seat of the present invention shown in the example of the driver seat on the left side in the case where the acceleration in the vehicle lateral direction outward direction and the vehicle lateral direction inward acceleration occur, for example, Is a schematic perspective view, and the lower column is a schematic plan view. It is a schematic front view of the airbag device for a front seat according to the present invention before deployment of the bag body. It is a general | schematic expanded sectional view in alignment with the AA of FIG. It is a control flowchart of the expansion | deployment timing of a bag body in the airbag apparatus for front seats of this invention. FIG. 2 is a schematic front view of the front seat airbag device when acceleration in the lateral direction of the vehicle in FIG. 1 occurs. It is a schematic sectional drawing in alignment with the BB line of FIG. FIG. 2 is a schematic front view of the front seat airbag device when acceleration inward in the vehicle left-right direction occurs in FIG. 1. It is a schematic sectional drawing which follows the CC line of FIG. FIG. 2 is a schematic cross-sectional view showing dimensional conditions for inflating and deploying three bag bodies in the front seat airbag device of FIG. 1. FIG. 2 is a schematic cross-sectional view showing internal pressure conditions in inflating and deploying three bag bodies in the front seat airbag device of FIG. 1. FIG. 3 is a schematic cross-sectional view showing a deployment timing condition in inflating and deploying three bag bodies in the front seat airbag device of FIG. 1. 3 is a graph showing a relationship between “deployment rate” and “time from collision” indicating deployment timing conditions in the inflation and deployment of three bag bodies in the front seat airbag device of FIG. 1. It is a schematic sectional drawing which shows an example of the folding method of three bag bodies in the airbag apparatus for front seats of FIG. It is the schematic sectional drawing which showed the expansion | deployment image of the three bags of FIG. 13 in order. It is the schematic front view which showed the expansion | deployment image of the three bags of FIG. 13 in order. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic front view of a front seat airbag device according to a first embodiment of the present invention (an example in which development of a bag body is controlled using an actuator). It is a general | schematic expanded sectional view which follows the DD line | wire of FIG. FIG. 17 is a schematic cross-sectional view of the front seat airbag device of FIG. 16 as viewed from the front when the entire front surface of the vehicle collides. FIG. 17 is a schematic cross-sectional view seen from the front direction when only the front right side of the vehicle collides in the front seat airbag device of FIG. 16. FIG. 17 is a partial control flowchart of bag body deployment timing in the front seat airbag device of FIG. 16. It is a schematic front view of the airbag apparatus for front seats concerning 2nd Example (another example which controls expansion | deployment of a bag body using an actuator) of this invention. It is a general | schematic expanded sectional view which follows the EE line | wire of FIG. It is the schematic sectional drawing which showed the mechanism of the gas supply of the airbag apparatus for front seats of FIG. 21 in order. It is a partial control flowchart of the bag body expansion | deployment timing in the airbag apparatus for front seats of FIG. It is a schematic front view of the airbag apparatus for front seats concerning 3rd Example (example which controls expansion | deployment of a bag body using a weight) of this invention. It is a general | schematic expanded sectional view in alignment with the FF line of FIG. It is the schematic sectional drawing which showed the mechanism of the gas supply of the airbag apparatus for front seats of FIG. 25 in order. It is a partial control flowchart of the bag body expansion | deployment timing in the airbag apparatus for front seats of FIG.

  The airbag apparatus for front seats of this invention is demonstrated with reference to FIGS. 1-28. 1 to 15 are applicable to all the embodiments of the present invention, FIGS. 16 to 20 are applicable to the first embodiment of the present invention, and FIGS. 21 to 24 are the second embodiment of the present invention. FIGS. 25 to 28 are applicable to the third embodiment of the present invention. Components having the same or similar configuration throughout all embodiments of the present invention are labeled with the same reference numerals throughout all embodiments of the present invention.

<< Configuration >>
First, the structure of the airbag device 10 for front seats of this invention is demonstrated.
As shown in FIG. 1 to FIG. 3 and FIG. 13 to FIG. 15, the front seat airbag device 10 of the present invention includes three or more bag bodies 12 and a gas generator 14 that generates inflation gas. And a gas supply control device 16 for supplying the expansion gas from the gas generator 14 to at least two of the plurality of bag bodies 12. Hereinafter, it demonstrates in order.

  The bag 12 is deployed and interposed between the head of the occupant P and a vehicle interior material (for example, a door trim, an instrument panel) at the time of a vehicle collision, and reduces the load input to the occupant P's head. . The bag body 12 includes three or more bag bodies 12 that are independent from each other, including a central bag body 12a and side bag bodies 12b and 12c provided on the left and right of the central bag body 12a.

  At least one side bag body 12b of the side bag bodies 12b and 12c is on the vehicle lateral direction outside (door trim side) of the center bag body 12a, and the remaining at least one side bag body 12c is the center bag body 12a. It suffices to be inside the vehicle in the left-right direction (center side of the instrument panel). Hereinafter, a case in which the bag body 12 includes three bag bodies, that is, one central bag body 12a, one vehicle lateral direction outer side bag body 12b, and one vehicle lateral direction inner side bag body 12c. Take an example.

  FIG. 1 shows the case where the bag body 12 is in front of the driver's seat when the driver's seat is on the left side portion of the vehicle, but the bag body 12 may be provided on a vehicle having the driver's seat on the right side portion of the vehicle. It may be provided in front of the passenger seat. When the bag body 12 is provided in front of the driver's seat, the bag body 12 is attached to the steering column 20 (including the steering wheel 20a and the inflator case 20b). When the bag body 12 is provided in front of the passenger seat, the bag body 12 is attached to the instrument panel 24.

  At the time of a frontal collision that does not involve vehicle lateral acceleration, only the central bag body 12a is inflated and deployed. At the time of a frontal collision that involves vehicle lateral acceleration, as shown in FIGS. Of the side bag bodies 12b and 12c, only the two bag bodies 12 with the side bag body on the collision side are inflated and deployed. This is to avoid a large-capacity gas generator 14 when all three bags 12a, 12b, 12c are inflated and deployed. The three bags 12 have a configuration capable of being inflated and deployed independently of each other so that one or two selected bags can be inflated and deployed.

  FIG. 3 shows an example of a structure for attaching the three bags 12a, 12b, 12c to the steering column 20. A gas generation device 14 and a gas guide inner 16 b constituting a part of the gas supply control device 16 are fixed to the steering column 20. The gas generator 14 is disposed inside the gas inner 16b. The gas guide outer 16c is movably attached to the gas guide inner 16b, and the three bag bodies 12a, 12b, 12c are attached to different portions of the gas guide outer 16c.

  3 and 13 also show how the three bags 12a, 12b, and 12c are folded. The central bag body 12a is preferably folded in a bellows in a direction extending to the passenger side. The side bag bodies 12b and 12c are preferably accordion-folded or roll-folded in a direction extending left and right, or both accordion-folded and roll-folded.

  A frontal collision with acceleration in the left-right direction of the vehicle includes an offset frontal collision or an oblique collision. In the offset frontal collision or oblique collision, the vehicle body is rotated around the vertical axis of the collision part on the front surface of the vehicle, and the occupant P tries to remain in the position before the collision with inertia. Trying to move to the collision side in the vehicle left-right direction. In order to restrain and protect the occupant P moving to the collision side, the side bag body to be inflated and deployed among the left and right side bag bodies 12b and 12c is the collision side bag body, that is, the front surface of the vehicle. The side bag body is located on the side close to the rear of the collision portion.

  As shown in FIGS. 1, 5, 7, and 11, the central bag 12 a covers the steering wheel 20 a from the passenger side when the bag 12 is in an inflated and deployed state. The side bag bodies 12b and 12c cover a portion offset from the occupant side in the vehicle left-right direction with respect to the vehicle rear portion of the steering wheel 20a. It is preferable that the volume of each side bag body 12b and 12c is below the volume of the center bag body 12a. This is for avoiding the case where the volume of the side bag bodies 12b and 12c is larger than the volume of the central bag body 12a because the gas generator 14 needs to have a large capacity.

  The side bag body 12b on the vehicle laterally outer side of the central bag body 12a has such a length that at least the front end portion of the side bag body 12b is supported from the side opposite to the occupant P by the door trim 22 in the inflated and deployed state. And / or have a shape. The side bag 12c on the inner side in the vehicle left-right direction of the central bag 12a is such that at least the tip of the side bag 12c is supported from the opposite side of the occupant P by the instrument panel 24 in the inflated and deployed state. It has a length and / or shape. The reason why at least the front end of the side bag body is supported by the door trim 22 or the instrument panel 24 at the time of deployment is to increase the occupant support force of the side bag bodies 12b and 12c, thereby making the gas generator 14 large. This is to avoid the need for capacity.

  Desirably, the dimensional conditions, internal pressure conditions, and deployment timing conditions of the bag body 12 are set as shown in FIGS. However, in FIGS. 9 to 11, both the left and right side bag bodies 12 b and 12 c are shown in an inflated and deployed state, but only one of the left and right side bag bodies 12 b and 12 c is actually inflated and deployed.

  With respect to the dimensional conditions, as shown in FIG. 9, the thicknesses h2 and h3 of the left and right side bag bodies 12b and 12c are the center bag body in the inflated and deployed state of the center bag body 12a and the left and right side bag bodies 12b and 12c. It is thicker than the thickness h1 of 12a. It does not matter whether h2 and h3 are large or small. The reason why h1 <h2 and h3 are set is to effectively suppress movement of the occupant head in the vehicle left-right direction.

  Regarding the pressure condition, as shown in FIG. 10, the pressures p2 and p3 of the left and right side bag bodies 12b and 12c are the center bag body in the inflated and deployed state of the central bag body 12a and the left and right side bag bodies 12b and 12c. It is made higher than the pressure p1 of 12a. The size of p2 and p3 does not matter. The reason why p1 <p2, p3 is to effectively suppress the movement of the occupant's head in the left-right direction of the vehicle.

  With respect to the deployment timing condition, as shown in FIGS. 11 and 12, at the time of a frontal collision with acceleration in the lateral direction of the vehicle, the side bag body 12b or 12c on the collision side is completely deployed before the central bag body 12a. It is configured. When the unfolded volume of the central bag body 12a and the side bag body 12b or 12c on the collision side is V1, V2 or V3, respectively, the side bag body 12b or 12c on the collision side is deployed before the central bag body 12a. It is configured so that the completed volume V2 or V3 is obtained, that is, the expansion rate is 1.0 first. Here, the expansion rate is the volume at a certain time / the volume at the complete expansion. Therefore, it is preferable that the side bag body 12b or 12c on the collision side starts to be deployed before the center bag body 12a at the time of a frontal collision with acceleration in the lateral direction of the vehicle. Further, before the occupant head comes into contact with the bag body 12, the central bag body 12a and the collision-side side bag body 12b or 12c are completely deployed.

  Only one gas generator 14 is provided for the three bags 12. One gas generator 14 is shared for the expansion and deployment of the three bags 12. The reason why the gas generators 14 are not separately provided in each of the three bag bodies 12 is to reduce the cost and the space required for the arrangement of the gas generators 14.

The gas generation device 14 may be configured by, for example, an inflator that is ignited when a sensor detects a collision and generates gas by a chemical reaction of a drug.
The gas generator 14 may be the same as or similar to the gas generator conventionally mounted on the steering column 20 and may have the same capacity. The reason why the capacity can be made comparable to the conventional capacity is that only the central bag 12a is inflated and deployed at the time of a frontal collision without acceleration in the lateral direction of the vehicle. Further, at the time of a frontal collision with acceleration in the left-right direction of the vehicle, the central bag body 12a and one side bag body are inflated and deployed, but the occupant P moves obliquely forward, so the inflated and deployed capacity of the central bag body 12a. This is because it can be used for the expansion and deployment capacity of one of the side bags, and it is not necessary to substantially increase the expansion and deployment capacity of both. Therefore, it is not necessary to change the design of the peripheral structure for assembling the gas generator 14.

  As shown in FIG. 5 to FIG. 8, the gas supply control device 16 supplies the bag inflation gas from the gas generator 14 only to the central bag 12a at the time of a frontal collision that does not involve acceleration in the vehicle lateral direction, It consists of a device that controls the supply of gas so as to supply only to the side bag on the collision side of the central bag 12a and the left and right side bags 12b, 12c at the time of a frontal collision with acceleration in the lateral direction of the vehicle. . The gas supply control device 16 executes a development timing control flow 100 for the bag 12 shown in FIG.

  As shown in FIG. 4, the development timing control flow 100 includes a determination step 102 for determining whether or not there is a difference in the longitudinal acceleration (acceleration, hereinafter also referred to as G) G of the left and right satellite sensors, and the main sensor. Determination steps 104A and 104B for determining whether or not the longitudinal acceleration of the airbag is greater than or equal to a predetermined acceleration for deploying the airbag device, and the flow of the inflation gas into the left and right side bags 12b and 12c Gas supply control step 106 for controlling to either one of 12b and 12c, and a gas generation step for generating a gas for expansion in a gas generator (for example, an inflator) 14 (an inflator ignition step when the gas generator 14 is an inflator) 108A and 108B.

  As the main sensor and the satellite sensor, sensors generally provided in a conventional vehicle may be used. The main sensor is a sensor that is provided at the center in the left-right direction of the vehicle and detects longitudinal acceleration. The satellite sensor is a sensor that is provided on the left side and the right side of the vehicle at the front of the vehicle and detects longitudinal acceleration.

  In the flowchart of FIG. 4, when the determination step 102 determines that there is no difference in the longitudinal acceleration G of the left and right satellite sensors, the process proceeds to determination step 104A. In the determination step 104A, it is determined whether or not the longitudinal acceleration of the main sensor is equal to or higher than a predetermined acceleration for deploying the airbag device. . Due to the gas generated by the gas generator 14, only the central bag 12a is inflated and deployed in step 110. In the determination step 104A, when the longitudinal acceleration of the main sensor is less than a predetermined acceleration for deploying the airbag device, the gas generator 14 does not generate gas.

When the determination step 102 determines that there is a difference in the longitudinal acceleration G of the left and right satellite sensors, the process proceeds to determination step 104B. In the determination step 104B, it is determined whether or not the longitudinal acceleration of the main sensor is equal to or greater than a predetermined acceleration at which the airbag device is deployed. If the acceleration is equal to or greater than the predetermined acceleration, the process proceeds to the gas supply control step 106 and the gas supply control step 106 To control the supply. Next, the process proceeds to a gas generation step 108B to cause the gas generator 14 to generate a gas. Due to the gas generated in the gas generation step 108B, the collision-side bag body of the left and right bag bodies 12b, 12c is inflated and deployed in step 112, and then in step 114, the central bag body 12a is inflated and deployed. In the determination step 104B, when the longitudinal acceleration of the main sensor is less than a predetermined acceleration for deploying the airbag device, the gas generator 14 does not generate gas.
The above configuration is commonly applied to all the embodiments of the present invention.
Specific configurations of the gas supply control device 16 and the gas supply control step 106 differ depending on the first to third embodiments of the present invention. This will be described below.

  In the first embodiment of the present invention, as shown in FIGS. 16 to 20, the gas supply control device 16 includes a gas guide inner 16b having a vent, a gas guide outer 16c having a vent, and a gas guide inner 16b. And a bearing 16d that movably supports one of the gas guide outers 16c on the other side, and an actuator 16a that moves one of the gas guide inner 16b and the gas guide outer 16c relative to the other. Since FIG. 17 is a cross section taken along the center line of FIG. 16, the left and right side bags 12b and 12c do not appear.

  When the entire front surface of the vehicle collides, the actuator 16a is not actuated and the gas guide outer 16c is in a neutral position with respect to the gas guide inner 16b. In this case, the front vent of the gas guide inner 16b and the front vent of the gas guide outer 16c coincide as shown in FIG. 18, and the inflation gas is supplied only to the central bag 12a.

  When only the front right side of the vehicle collides, as shown in FIG. 19, the actuator 16a operates to move the gas guide outer 16c relative to the gas guide inner 16b, and the right front vent and the gas guide of the gas guide inner 16b. The right front vent of the outer 16c is matched, and the right side vent of the gas guide inner 16b and the right side vent of the gas guide outer 16c are matched. Thus, the inflation gas is supplied only to the central bag body 12a and the right side bag body 12c.

  When only the front left side of the vehicle collides, although not shown, the actuator 16a operates to move the gas guide outer 16c relative to the gas guide inner 16b, and the left front vent of the gas guide inner 16b and the gas guide outer The left front vent of 16c is matched, and the left side vent of gas guide inner 16b and the left side vent of gas guide outer 16c are matched. Thus, the inflation gas is supplied only to the central bag body 12a and the left side bag body 12b.

  In the first embodiment, as shown in FIG. 20, the gas supply control step 106 has an actuator ON step 106a for operating the actuator 16a, and a gas guide moving step 106b for moving the gas guide outer 16c thereby.

  In the second embodiment of the present invention, as shown in FIGS. 21 to 24, the gas supply controller 16 includes an actuator 16e for tilting the gas generator 14, a gas guide 16f having a front vent and a side vent. And a center shaft 16g and a bearing 16h that supports the gas generator 14 so as to be swingable within a plane including the axis of the center shaft 16g.

  When the entire front surface of the vehicle collides, as shown in the left column of FIG. 23, the actuator 16e is not actuated, and the gas generator 14 is not tilted and is in a neutral position. In this case, the inflation gas generated from the gas generator 14 is supplied only to the central bag 12a through the front vent.

  When only the front right side of the vehicle collides and lateral acceleration occurs, the actuator 16e is actuated to tilt the gas generator 14 as shown in the right column of FIG. The left gas outlet of the gas generator 14 is opposed to the front vent of the gas guide 16f. Thus, the inflation gas is supplied only to the central bag body 12a and the right side bag body 12c.

  In the case where only the front left side of the vehicle collides and a lateral acceleration is generated, the illustration is omitted in FIG. 23, but the actuator 16e is actuated to tilt the gas generator 14 in the direction opposite to the direction shown in the right column of FIG. The left gas outlet of the gas generator 14 is opposed to the side vent of the gas guide 16f, and the right gas outlet of the gas generator 14 is opposed to the front vent of the gas guide 16f. Thus, the inflation gas is supplied only to the central bag body 12a and the left side bag body 12b.

  In the second embodiment, as shown in FIG. 24, the gas supply control step 106 includes an actuator 16eON step 106c that operates the actuator 16e, and a gas generator tilting step 106d that tilts the gas generator 14 thereby. .

  In the third embodiment of the present invention, as shown in FIGS. 25 to 28, the gas supply control device 16 has left and right weights that tilt the gas generation device 14 due to the difference in longitudinal acceleration between the left and right portions of the gas generation device 14. 16i, 16j, a gas guide 16k having a front vent and a side vent, a central axis 16m, and a bearing 16n that supports the gas generator 14 so as to be swingable in a plane including the axis of the central axis 16m. Have. In the third embodiment, the gas supply control device 16 does not have an actuator. In the third embodiment, the front seat airbag device 10 does not have to have a satellite sensor.

  When the entire front of the vehicle collides, the same amount of longitudinal acceleration acts on the left and right weights 16i, 16j. Therefore, as shown in the left column of FIG. 27, the gas generator 14 is not tilted and is in the neutral position. is there. In this case, the inflation gas generated from the gas generator 14 is supplied only to the central bag 12a through the front vent.

  In the case where only the front right side of the vehicle collides and lateral acceleration occurs, the left and right weights 16i and 16j have a larger longitudinal acceleration on the left side weight than the right side weight, so as shown in the right column of FIG. The left and right weights 16i, 16j tilt the gas generator 14 clockwise, the right gas outlet of the gas generator 14 faces the side vent of the gas guide 16k, and the left gas outlet of the gas generator 14 is It is made to oppose the front vent of the gas guide 16k. Thus, the inflation gas is supplied only to the central bag body 12a and the right side bag body 12c.

  In the case where only the left side of the front of the vehicle collides and a lateral acceleration is generated, although not shown in FIG. 27, the left and right weights 16i, 16j tilt the gas generator 14 counterclockwise to the left side of the gas generator 14. The gas outlet is opposed to the side vent of the gas guide 16k, and the right gas outlet of the gas generator 14 is opposed to the front vent of the gas guide 16k. Thus, the inflation gas is supplied only to the central bag body 12a and the left side bag body 12b.

  In the third embodiment, as shown in FIG. 28, the gas supply control step 106 includes a gas generator tilting step 106e that automatically tilts the gas generator 14 due to the difference in the magnitude of the longitudinal acceleration of the weights 16i and 16j. Have

<< Action and effect >>
Next, functions and effects of the front seat airbag device 10 of the present invention will be described.
At the time of a frontal collision without vehicle lateral acceleration, only the central bag 12a is inflated and deployed, and the occupant P inertially moving forward is restrained and protected as before.
At the time of a frontal collision with acceleration in the left-right direction of the vehicle, the two bags 12 of the central bag 12a and only the side bag on the collision side are inflated and deployed, and the occupant P that moves by inertia both forward and diagonally by the two bags 12 Restrain and protect.

  In this case, in a frontal collision involving acceleration in the lateral direction of the vehicle, in a collision where the collision part is close to the occupant P, the central bag body 12a and the side bag body on the collision side among the left and right side bag bodies 12b and 12c. Since only the left and right side bag bodies 12b and 12c are inflated and deployed, it can be deployed in a range that can sufficiently cover the occupant head, and the movement of the occupant P toward the side door can be suppressed. . Further, the front end portion of the side bag body on the collision side can reach the door trim 22 and is supported by the door trim 22 from the side opposite to the occupant P, so that both the left and right side bag bodies 12b and 12c are inflated. The head holding force of the side bag on the collision side can be increased as compared with the case where the side end of the side bag does not reach the door trim 22 due to insufficient expansion after deployment.

  In the case of a frontal collision involving acceleration in the lateral direction of the vehicle, in a collision where the collision part is far from the occupant, only the central bag 12a and the side bag on the collision side of the left and right side bags 12b and 12c are present. Since inflated and deployed, the lateral bag bodies 12b and 12c on both the left and right sides can be deployed in a range that can sufficiently cover the occupant head, and movement of the occupant P toward the center in the vehicle width direction can be suppressed. . Moreover, since the deployment side tip of the side bag body on the collision side can reach the instrument panel 24 and is supported by the instrument panel 24 from the side opposite to the occupant P, the instrument panel 24 is not reached. In comparison, the head holding force of the side bag on the collision side can be increased.

  Since the side bag body on the collision side is supported by the door trim 22 or the instrument panel 24 from the side opposite to the occupant P, the bag body 12 is provided in order to enhance the head holding force of the occupant P compared to the case where it is not supported. There is no need to increase the capacity and it is not necessary to increase the output of the gas generator 14.

  Since the dimensional condition and the internal pressure condition of the bag body 12 are set to h2, h3> h1, and p2, p3> p1, when the occupant P hits the inflated and deployed bag body 12, the occupant P becomes the central bag. It is guided to the body 12a side, and the lateral movement of the passenger head to the collision side can be effectively suppressed. As a result, it is possible to suppress the possibility that the head of the occupant will come off the auxiliary airbag and collide with the door trim or the instrument panel, which has existed in the conventional airbag device.

Since the side bag body on the collision side is completely deployed before the central bag body 12a at the expansion and deployment timing of the bag body 12, that is, the deployment rate of the side bag body on the collision side is 1 before the center bag body 12a. Therefore, the lateral movement of the occupant P can be more effectively suppressed.
The above operations and effects can be commonly applied to all the embodiments of the present invention.

In each embodiment of the present invention, the following operations and effects can be obtained in addition to the operations and effects that can be commonly applied to all the embodiments of the present invention described above.
In the first embodiment of the present invention, since the collision with the lateral acceleration is detected by the satellite sensor, the collision with the lateral acceleration can be reliably detected. In addition, since the gas supply control in the gas supply control device 16 is performed by moving the gas generation device 14 using the actuator 16a, the gas supply control can be reliably performed.

  In the second embodiment of the present invention, since the collision with the lateral acceleration is detected by the satellite sensor, the collision with the lateral acceleration can be reliably detected. In addition, since the gas supply control in the gas supply control device 16 is performed by tilting the gas generation device 14 using the actuator 16e, the gas supply control can be reliably performed.

  In the third embodiment of the present invention, the left and right weights 16i, 16j are attached to the gas generator 14 so as to detect the collision with the lateral acceleration and tilt the gas generator 14. The satellite sensor and actuator required in the third embodiment can be eliminated, which is advantageous in cost compared to the first and second embodiments and simplifies the apparatus.

10 Vehicle front seat airbag device (front seat airbag device)
12 bag body 12a center bag body 12b vehicle lateral direction outer side bag body 12c vehicle lateral direction inner side bag body 14 gas generator 16 gas supply control device

Claims (3)

  Three independent bags including a central bag and side bags provided on the left and right of the central bag, a gas generator, and an inflation gas from the gas generator are accompanied by acceleration in the vehicle lateral direction. Gas supply control device that supplies only to the central bag when there is no frontal collision and supplies only to the side bag on the collision side of the central bag and left and right side bags when there is a frontal collision with vehicle lateral acceleration And an airbag device for a front seat of a vehicle.   In the inflated and deployed state of the central bag body and the left and right side bag bodies, the thicknesses h2 and h3 of the left and right side bag bodies are set larger than the thickness h1 of the central bag body, and the pressure of the left and right side bag bodies The airbag device for a front seat of a vehicle according to claim 1, wherein p2 and p3 are set to be larger than a pressure p1 of the central bag body.   3. The vehicle according to claim 1, wherein the gas supply control device is configured to complete deployment of the side bag body on the collision side before the center bag body at the time of a frontal collision with acceleration in the vehicle left-right direction. Front seat airbag device.

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