JP4479256B2 - Airbag device for vehicle - Google Patents

Description

  The present invention belongs to a technical field related to a vehicle airbag device including an airbag configured to push up a rear end portion of a hood of a vehicle and deploy it on a front window.

2. Description of the Related Art Conventionally, as shown in, for example, Patent Document 1, a vehicle airbag apparatus including an airbag configured to push up a rear end portion of a hood hood of a vehicle and deploy it on a front window is known. Yes. The airbag of the vehicle airbag apparatus includes a first deployment portion that is deployed at a position below a rear end portion of the hood of the vehicle, and a second deployment portion that is deployed on a front wind of the vehicle. The entire second width direction of the first expanding portion is expanded by the gas supplied from the inflator to form a push-up portion that pushes up the rear end portion of the bonnet hood, and the second expansion communicating with the first expanding portion. The part is developed on the front window from the gap between the rear end of the hood hood pushed up by the first development part and the front window by the gas supplied from the inflator via the first development part. Is configured to do. When a collision with an obstacle (such as a pedestrian) is detected by a collision detection sensor provided on the front bumper, the inflator is initiated, and gas is thereby sent from the inflator to the first and second deployment parts of the airbag. Sequentially supplied. As a result, the first deploying portion is unfolded first, and the rear end of the hood hood is pushed upward by this unfolding, and then the second unfolding is performed from the gap between the pushed hood hood rear end and the front window. The part expands on the front window.
Japanese Patent Application Laid-Open No. 2002-308028

  However, in the above-described conventional airbag device, the gas supplied to the first deployment part (push-up part) immediately flows to the second deployment part, so that the rear end part of the bonnet hood is slightly raised, and the second deployment is performed. The rear part of the hood hood, which is located on the front side of the vehicle with respect to the front window and may collide earlier, is developed for the development of the second development part. As a result, when the obstacle collides with the rear end of the hood, there is a possibility that the rear end of the hood is not sufficiently raised.

  The present invention has been made in view of such a point, and an object of the present invention is to push up the rear end portion of the hood of the vehicle and deploy the airbag on the front window as described above. In order to raise the rear end of the hood hood as early as possible and to deploy the airbag as early and stably as possible There is.

In order to achieve the above object, in the present invention, an orifice is provided between the push-up portion and the second spread portion of the first spread portion, and the push-up portion and the second spread portion of the first spread portion are provided. And the gas pressure in the first development portion becomes equal to or higher than a predetermined value, so that the suture diameter in the vicinity of the orifice is broken and the orifice diameter is increased. In the deployed state of the airbag, push-up portions of the first deployed portion of the airbag are provided at both ends in the vehicle width direction of the first deployed portion, so that the first deployed portion is in the vehicle width direction. It extends to the front of the vehicle from the center .

  Specifically, in the invention of claim 1, an airbag having a first deploying portion that is deployed at a position below a rear end portion of a hood of a vehicle and a second deploying portion that is deployed on a front wind of the vehicle is provided. The vehicle airbag apparatus provided is an object.

Then, the part in the vehicle width direction of the first expansion portion of the airbag with a configured push-up portion to push upward the hood rear portion by expanding the gas supplied from the inflator, the second The developing unit develops on the front window from the gap between the rear end portion of the hood hood pushed up by the pushing-up unit and the front window by the gas supplied from the inflator via the pushing-up unit. The first deployment portion and the second deployment portion are partitioned by a stitched portion formed by sewing the upper surface and the lower surface of the airbag with a thread, and a part of the stitched portion is The orifice is not sewn, and the orifice is provided between the push-up portion and the second deployment portion of the first deployment portion, and the gas pressure in the first deployment portion is a predetermined value. By the above, the yarn of the sewing portions in the vicinity of the orifice is broken, is configured such that the orifice diameter increases, the deployed state of the air bag, the first expansion portion of the airbag It is assumed that the push-up portions are provided at both ends in the vehicle width direction of the first deployment portion and extend forward of the vehicle from the center portion in the vehicle width direction of the first deployment portion .

  With the above configuration, the gas flow between the push-up portion and the second spread portion of the first developing portion is restricted by the orifice, so that after the push-up portion is almost completely developed, the gas is supplied to the second spread portion. And flow. As a result, the rear end portion of the hood hood is pushed up early and reliably, and even if the obstacle collides with the hood before the front window, the impact force can be reduced. Then, after the rear end of the hood hood rises, the second deploying portion can be quickly and stably deployed on the windshield without being obstructed by the hood, thereby preventing an obstacle from colliding with the windshield. it can. In addition, since the orifice diameter is increased when the gas pressure in the first deployment portion becomes a predetermined value or more, the second deployment portion can be deployed even earlier.

Furthermore, by providing the push-up portions of the first deploying portion at both ends in the vehicle width direction of the first deploying portion, and supporting the both ends in the vehicle width direction of the rear end portion of the bonnet hood so as to be vertically movable, By pushing up both ends, it is possible to prevent the center portion in the vehicle width direction of the rear end of the hood hood from being greatly deformed above the both ends by the deployment of the airbag. Can be deployed stably. Moreover, the hood hood rear end can be pushed up over the longest possible range in the vehicle front-rear direction by extending the push-up portion forward of the vehicle from the vehicle width direction central portion of the first deployment portion. It is possible to prevent the hood hood from breaking at the middle part in the vehicle longitudinal direction.

As described above, according to the vehicle airbag device of the present invention, an orifice is provided between the push-up portion of the first deployment portion and the second deployment portion, and the gas pressure in the first deployment portion is a predetermined value. As a result, the suture thread in the vicinity of the orifice is broken, so that the orifice diameter is increased and the first deployed portion of the airbag is pushed up in the deployed state of the airbag. Parts at the vehicle width direction both ends of the first deploying portion and extending in front of the vehicle from the vehicle width direction central portion of the first deploying portion, so that the rear end portion of the hood While being able to raise, an airbag (especially 2nd expansion | deployment part) can be expanded early and stably. Moreover, it is possible to prevent the hood hood from breaking at the middle part in the vehicle front-rear direction.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 and 2 show a front portion of a vehicle 1 on which a vehicle airbag device according to an embodiment of the present invention is mounted. A vehicle body cowl portion 10 (a front position of a front window 16) in the engine room of the vehicle 1 is shown. ), The airbag 2 of the vehicle airbag device is housed. The airbag 2 is stored in a folded state in a substantially rectangular box-shaped airbag storage box 3 that extends in the vehicle width direction. The airbag storage box 3 is used when the airbag 2 is deployed. It is made of a material that is easily broken by the unfolding force of the bag 2.

  An inflator storage box 4 for storing an inflator 5 (see FIG. 4) for supplying gas into the airbag 2 and having an opening on the upper surface is disposed below the airbag storage box 3. A gas inlet 2e (see FIG. 3) provided in the airbag 2 and for allowing gas to flow into the airbag 2 is disposed above the opening of the inflator storage box 4. The gas inflow port 2e is provided in a lower portion (a gas conduction path 2d of the first deployment portion 2a described later) of a substantially central portion in the vehicle width direction of the deployed airbag 2.

  The bonnet hood 11 of the vehicle 1 is configured to be rotatable about hinge shafts 12 provided at both ends in the vehicle width direction of the vehicle body cowl portion 10 and extending in the vehicle width direction. That is, one end portion of each of the two link members 13 is rotatably attached to each of the hinge shafts 12, and the other end portions of the both link members 13 are at both ends in the vehicle width direction of the rear end portion of the hood hood 11. Each of the hoods 11 is rotatably attached, and the hood 11 is rotated around the hinge shaft 12 via both link members 13. A bonnet lock 14 is provided at the center of the rear surface of the front end of the hood hood 11 in the vehicle width direction, and the hood lock 11 is locked in a state where the opening on the upper side of the engine compartment is closed. On the other hand, when the lock is released, the front end of the hood hood 11 is lifted upward to rotate around the hinge shafts 12 so that the opening on the upper side of the engine room can be opened. (Refer to the one-dot chain line in FIG. 2).

  Each link member 13 includes an outer cylinder member 13a and an inner cylinder member 13b that can be fitted to each other and slid in the length direction, and the length of the link member 13 can be changed by this sliding. However, the length of the link member 13 does not change and is shortest except when the rear end of the hood hood 11 is pushed up by the deployment of the airbag 2 as will be described later.

  Further, when the hood hood 11 is locked in a state in which the opening on the upper side of the engine room is closed by the hood lock 14, the hood hood 11 is pushed upward to the rear surface of the rear end of the hood hood 11 (greater than a predetermined value). 2), as shown by a two-dot chain line in FIG. 2, the location of the bonnet lock 14 becomes a rotation center axis extending in the vehicle width direction and rotates about the rotation center axis. Thus, the rear end of the hood hood 11 moves upward. At this time, as the hood hood 11 rotates, the length of the link member 13 is increased by the sliding of the outer cylinder member 13a and the inner cylinder member 13b (however, when the predetermined length is reached, a stopper not shown) Will not slide any further.) That is, the rear end portion of the hood hood 11 is supported by the link member 13 so as to be movable up and down. The push-up force at the rear end of the bonnet hood 11 is obtained by the deploying force of the airbag 2 (push-up portion 2c of the first deployment portion 2a described later), and when the airbag 2 is deployed, The end is pushed up.

  In addition, the reinforcement board 15 is provided in the peripheral part perimeter and diagonal line in the back surface of the said bonnet hood 11 similarly to the conventional normal bonnet hood.

  1, the airbag 2 extends upward from the vehicle body cowl 10 toward the rear side of the vehicle along the front window 16, as shown by a two-dot chain line. Specifically, as shown in FIG. 3, the airbag 2 includes a first deployment portion 2 a that deploys substantially the entire vehicle width direction at a position below the rear end portion of the hood 11 of the vehicle 1, and the vehicle. A first unfolded portion 2b that unfolds over substantially the entire vehicle width direction on one front window 16. And the vehicle width direction both ends of the said 1st expansion | deployment part 2a are pushed up by the gas supplied from the inflator 5 via the gas inflow port 2e of the airbag 2 by pushing up the said bonnet hood 11 rear-end part upwards. A push-up portion 2c is configured. That is, when the push-up portion 2c is deployed, the push-up portion 2c abuts both ends of the rear end portion of the hood hood 11 in the vehicle width direction and pushes the rear end portion of the hood hood 11 upward by the unfolding force. It has become. Further, the push-up portion 2c extends forward of the vehicle from the vehicle width direction center portion (a gas conduction path 2d described later) of the first deployment portion 2a. On the other hand, the vehicle width direction center part of the 1st expansion | deployment part 2a is made into the gas conduction path 2d which guides the gas which flowed in from the said gas inflow port 2e to the raising part 2c. Even if the gas conduction path 2d is deployed, it does not contact the rear end portion of the hood hood 11, and the rear end portion of the hood hood 11 is not pushed up by the deployment of the gas conduction path 2d.

  The second expansion part 2b is connected to the upper side of the first expansion part 2a, and the first expansion is performed by the gas supplied from the inflator 5 via the push-up part 2c of the first expansion part 2a. The hood hood 11 pushed up by the portion 2 a is configured to expand on the front window 16 from a gap between the rear end of the hood 11 and the front window 16. In addition, the vehicle width direction both ends of the 2nd expansion | deployment part 2b are expand | deployed on the left-right front pillar 17. As shown in FIG.

  The first deployment portion 2a and the second deployment portion 2b are partitioned by a stitching portion 2f formed by stitching the upper surface and the lower surface of the airbag 2 with a thread. A part of the stitching portion 2f (the portion corresponding to the push-up portion 2c) is not stitched and is an orifice 2g. The thread of the stitching portion 2f in the vicinity of the orifice 2g is broken when the gas pressure in the push-up portion 2c becomes equal to or higher than a predetermined value (a value larger than the gas pressure capable of pushing up the rear end portion of the bonnet hood 11). As a result, the orifice diameter is increased.

  As shown in FIG. 4, the initiation control of the inflator 5 is performed by a control unit 31 connected to the inflator 5. The control unit 31 may be shared with the engine control unit or the like, or may be separate. The control unit 31 is connected to the collision prediction sensor 22, the collision detection sensor 23, and the vehicle speed sensor 24, and inputs each information from the sensors 22 to 24 to perform the initiation control of the inflator 5.

  The collision prediction sensor 22 is a sensor that detects an obstacle existing in front of the vehicle 1 and measures a positional relationship and a distance between the vehicle 1 and the obstacle in order to predict a collision of the vehicle 1 with an obstacle. The control unit 31 predicts a collision with an obstacle based on the information from the collision prediction sensor 22 and the information from the vehicle speed sensor 24 (for example, laser radar, millimeter wave radar, ultrasonic radar, etc.). .

  The collision detection sensor 23 is provided in the front bumper 21 of the vehicle 1 and transmits a contact signal to the control unit when the front bumper 21 comes into contact with an obstacle. A collision of the vehicle 1 with an obstacle is detected by a contact signal from the collision detection sensor 23. Note that it is not necessary to provide both the collision prediction sensor 22 and the collision detection sensor 23, and only one of them may be provided.

  The control unit 31 predicts the collision with the obstacle based on the information from each of the sensors 23 to 25 or starts the inflator 5 when the collision with the obstacle is detected. It has become.

  When the inflator 5 is detonated in this way, the gas of the inflator 5 is supplied from the gas inlet 2e to the gas conduction path 2d of the first deployment portion 2a of the airbag 2, as shown by the arrows in FIG. It is supplied from the gas conduction path 2d to the push-up portion 2c. As a result, the push-up portion 2c is developed and the rear end portion of the hood hood 11 is pushed up. At this time, a part of the gas supplied to the push-up portion 2c is supplied from the orifice 2g to the second developing portion 2b. However, until the push-up portion 2c is almost completely developed, the gas 2 2 The flow to the unfolding portion 2b is limited and hardly flows to the second unfolding portion 2b. As a result, the rear end portion of the hood hood 11 is reliably pushed up. Further, since the push-up portion 2 pushes up both ends in the vehicle width direction supported by the link member 13 at the rear end portion of the bonnet hood 11, the center portion in the vehicle width direction of the rear end portion of the bonnet hood 11 is expanded by the deployment of the airbag 2. There is no significant deformation above both ends. Further, since the push-up portion 2 extends in front of the vehicle with respect to the vehicle width direction center portion of the first deployment portion 2a, the rear end portion of the hood hood 11 extends over the longest possible range in the vehicle front-rear direction. It can push up and can prevent that the bonnet food | hood 11 bends in the vehicle front-back direction intermediate part.

  When the push-up portion 2c is almost completely deployed and the rear end portion of the hood hood 11 is almost completely pushed up, the gas pressure in the push-up portion 2c eventually becomes a predetermined value or more, so that the stitching in the vicinity of the orifice 2g is performed. The yarn of the portion 2f is broken to increase the orifice diameter, whereby gas is supplied to the second developing portion 2b at a stretch and the second developing portion 2b is developed.

  Therefore, in the above-described embodiment, the gas flow between the push-up portion 2c and the second spread portion 2b of the first spread portion 2a is restricted by the orifice 2g, so that the push-up portion 2c is spread almost completely. Gas will later flow to the second deployment part 2b, and the rear end of the bonnet hood 11 can be pushed up early and reliably, even if an obstacle collides with the hood before the front window 16. Impact force can be reduced. Then, after the rear end of the hood hood 11 is raised, the second developing portion 2b is smoothly deployed on the front window 16 without being obstructed by the hood hood 11, and an obstacle is prevented from colliding with the front window 16. be able to.

  Hereinafter, reference embodiments different from the present invention will be described. In the above embodiment, the orifice 2g is provided between the push-up portion 2c and the second spread portion 2b of the first spread portion 2a, and the orifice diameter is increased by the gas pressure in the push-up portion 2c. The orifice diameter may remain constant.

  Moreover, you may make it completely partition between the raising part 2c of the 1st expansion | deployment part 2a, and the 2nd expansion | deployment part 2b with the stitching | suture part 2f. That is, the communication between the push-up portion 2c and the second deployment portion 2b is blocked by the stitching portion 2f until the thread of the stitching portion 2f is broken. And the thread | yarn of the stitching | suture part 2f is fractured | ruptured when the gas pressure in the raising part 2c becomes more than predetermined value (value larger than the gas pressure which can push up the bonnet hood 11 rear end part), and pushes up. The part 2c and the 2nd expansion | deployment part 2b are made into a communication state. In this case, the thread | yarn of the stitching | suture part 2f comprises the interruption | blocking means which interrupts | blocks communication with the raising part 2c and the 2nd expansion | deployment part 2b. Such blocking means may be any as long as it can be broken by the gas pressure in the push-up portion 2c.

  Further, when the communication between the push-up portion 2c and the second deployment portion 2b is blocked by the blocking means as described above, the blocking device is broken after the predetermined time has elapsed from the start of the deployment of the airbag 2, You may make it provide the fracture | rupture means which makes the 2nd expansion | deployment part 2b a communication state. When the blocking means is a yarn as described above, examples of the breaking means include a heating wire disposed so as to be in contact with a part of the yarn. That is, the yarn cannot be broken only by the gas pressure in the airbag 2, and the control unit 31 controls the energization of the heating wire so that the heating wire is turned on after a predetermined time from the start of the deployment of the airbag 2. By energizing, a part of the yarn is broken, and coupled with the gas pressure, the yarn is completely broken to bring the push-up portion 2c and the second developing portion 2b into communication.

  The control procedure of the control unit 31 when the breaking means is broken by the breaking means in this way will be described based on the flowchart of FIG. 5. In step S1, information is input from the sensors 23 to 25, and the next step. In S2, it is determined whether or not a collision with an obstacle has been predicted based on the information, or whether or not a collision with an obstacle has been detected. If this determination is NO, the process returns as it is, while the determination is YES. When it is, it progresses to step S3, the inflator 5 is detonated, and it progresses to step S4. In this step S4, it is determined whether or not a predetermined time has elapsed since the inflator 5 was started (start of deployment of the airbag 2). If the determination in step S4 is NO, the process returns as it is, while the determination in step S4 is performed. When YES is determined, the process proceeds to step S5 to operate the breaking means (for example, energize the heating wire) to break the interruption means, and then return.

  As described above, the communication between the push-up portion 2c and the second deployment portion 2b is blocked by the shut-off means, and the shut-off means is broken by the gas pressure in the push-up portion 2c, or the airbag 2 is deployed. Even if the rupture means breaks after a predetermined time has elapsed from the start, the airbag 2 can be deployed early and stably as in the above embodiment.

In the above SL embodiment and reference embodiment, although not provided inflator 5 only one may be provided two or more.

  INDUSTRIAL APPLICABILITY The present invention is useful for a vehicle airbag apparatus including an airbag configured to push up a rear end portion of a hood hood of a vehicle and deploy it on a front window.

It is a schematic perspective view which shows the front part of the vehicle by which the airbag apparatus for vehicles which concerns on embodiment of this invention is mounted. It is a schematic sectional drawing of the front part of the vehicle of FIG. It is a top view which shows the expansion | deployment state of the airbag of the airbag apparatus for vehicles. It is a block diagram which shows the structure of the vehicle airbag apparatus. In a reference form, it is a flowchart which shows the control procedure of the control unit in the case of making a interruption | blocking means fracture | rupture by a fracture | rupture means.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Air bag 2a 1st expansion | deployment part 2b 2nd expansion | deployment part 2c Push-up part 2g Orifice 5 Inflator 11 Bonnet hood

Claims (1)

A vehicle airbag apparatus comprising an airbag having a first deployment portion deployed at a position below a rear end portion of a hood hood of a vehicle and a second deployment portion deployed on a front wind of the vehicle,
Part in the vehicle width direction of the first expansion portion of the airbag, constitute the push-up portion for pushing up the hood rear portion upward by expanding the gas supplied from the inflator,
The second deploying portion is disposed on the front window from a gap between the rear end portion of the hood hood pushed up by the push-up portion and the front wind by the gas supplied from the inflator via the push-up portion. Configured to deploy to
The first deployment portion and the second deployment portion are partitioned by a stitched portion formed by stitching the upper surface and the lower surface of the airbag with a thread,
A part of the stitched portion is not stitched and is an orifice,
The orifice is provided between the push-up portion and the second development portion of the first development portion,
When the gas pressure in the first deployment portion is equal to or greater than a predetermined value, the suture diameter in the vicinity of the orifice is broken, so that the orifice diameter is increased .
In the deployed state of the airbag, the push-up portions of the first deployment portion of the airbag are provided at both ends in the vehicle width direction of the first deployment portion, and from the center in the vehicle width direction of the first deployment portion. The vehicle airbag device is also provided in front of the vehicle.

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