JPH07156749A - Fall preventing air bag device - Google Patents

Abstract

PURPOSE:To prevent a pedestrian who suffers from the secondary collision on a hood from falling on the road surface. CONSTITUTION:When a pedestrian collision detecting sensor 13 detects the collision with a pedestrian, the movement of the pedestrian on a hood is regulated and prevents him(her) from falling from the hood 14 because air bags 15, 16 for preventing fall which can be developed in a continuous wall shape are provided on the peripheral part of the hood 14, etc., of a vehicle body. Fall can also be prevented by forming a continuous wall part on the peripheral part of the hood air bag which is inflated and developed on the hood. The air bag device can consist of the air bag to be developed on the hood first, and the air bag for preventing fall which is developed on the peripheral part later, and a fall preventing part can be formed by folding the peripheral part of the developed hood air bag upward.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air bag for preventing a pedestrian who once collided with a hood or a roof of a vehicle from colliding with a pedestrian when the running vehicle collides with the pedestrian. It relates to the device.

[0002]

2. Description of the Related Art It is known that when a running vehicle collides with a pedestrian, the collided pedestrian is secondarily collided with the lower half of the body by the front portion of the vehicle body and the upper surface of the hood at the front portion of the vehicle body. There is. For example, FIG. 22 shows U.S. Pat. No. 4,249,632.
1 shows a safety device for protecting pedestrians disclosed in the specification of the present invention. When a collision of a pedestrian 4 is detected by a sensor 3 provided on a bumper 2 at a front end portion of a vehicle 1, a hood 5 The airbag 6 installed at the lower rear end inflates and deploys,
By elastically lifting the rear end side of the hood 5 upward, the impact when the pedestrian 4 makes a secondary collision with the hood 5 is alleviated.

[0003]

However, in the above-mentioned conventional safety device for pedestrian protection, the pedestrian 4 collided with the vehicle can absorb the impact when the pedestrian 4 collides with the hood 5 for the second time. The pedestrian 4 who has fallen onto the vehicle 5 may move on the hood and fall from the edge thereof to the road surface.

The present invention has been made in view of the above circumstances, and when a running vehicle collides with a pedestrian, an air bag is inflated in a wall shape around a peripheral portion of the hood to temporarily remove the hood or the like. It is an object of the present invention to provide an airbag device that prevents a pedestrian placed on it from falling.

[0005]

As a means for solving the above-mentioned problems, a fall prevention airbag device of the present invention is
Pedestrian collision detection means for detecting a collision with a pedestrian, airbags installed on the hood of the vehicle body and the peripheral portion of the roof and the front pillar portion, and inflating and deploying like a wall at each position, and the pedestrian collision An inflator for inflating and deploying the airbag when the detecting means detects a collision with a pedestrian.

Further, a pedestrian collision detecting means for detecting a collision with a pedestrian, an airbag which is inflated and deployed on the hood of the vehicle body and on the roof and has a wall portion at its peripheral portion, and the pedestrian collision detecting means. Is equipped with an inflator for inflating and deploying each of the airbags when a collision with a pedestrian is detected.

Further, a pedestrian collision detection means for detecting a collision with a pedestrian, and a first airbag which is inflated and deployed at least on the hood of the vehicle body when the pedestrian collision detection means detects a collision with a pedestrian. A second airbag is inflated and deployed in a wall shape on at least one of an upper surface and a peripheral portion of the first airbag after a predetermined time has elapsed from the start of deployment of the first airbag.
It is characterized by having an airbag.

Furthermore, a pedestrian collision detection means for detecting a collision with a pedestrian and an opening at the peripheral portion of the hood of the vehicle body,
Moreover, when the pedestrian collision detection means detects a collision with a pedestrian, the airbag is housed in a storage part that is opened and closed by a lid, and gas is generated to inflate the airbag onto the hood. With an inflator to be deployed, when the airbag is inflated and deployed,
A lid holding means for holding the lid so as to form a fall-preventing portion by raising the peripheral portion of the airbag is provided.

[0009]

With the above-described structure, when the pedestrian collision detection means detects a collision with a pedestrian, the gas supplied from the inflator causes the airbag to form a wall shape on the peripheral portions of the hood and roof and the pillar portion. It expands and expands to surround the hood, the roof and the periphery of the windshield. Therefore, a pedestrian who has a secondary collision on the hood, roof, or windshield is restrained from moving by an airbag that inflates and deploys like a wall, and is held on the hood or on the roof to prevent it from falling to the road surface. It

When a collision with a pedestrian is detected, the gas supplied from the inflator inflates and deploys the airbag to cover the hood and the roof, and the peripheral portions of the airbag inflat and deploy. The impact on the pedestrian that has collided secondly on the hood or on the roof is alleviated, and the wall-shaped portion at the peripheral edge prevents the pedestrian from falling to the road surface.

When a collision with a pedestrian is detected, the gas supplied from the inflator first causes the first airbag to expand so as to cover the hood or the hood and the roof, and collide with the hood or the roof. The second airbag is inflated and deployed on at least one of the upper surface and the peripheral portion of the first airbag after a predetermined time delay to prevent the pedestrian from falling on the road surface.

Further, since the lid that has closed the storage portion of the airbag is pushed open by the airbag that expands and deploys on the hood, the peripheral edge portion of the airbag rises to form the fall prevention portion. , The pedestrian who collided,
The airbag absorbs the impact of a collision on the hood, and the fall prevention portion prevents the fall from the hood onto the road surface.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a fall prevention airbag device according to the present invention will be described below with reference to FIGS.

FIGS. 1 to 3 show a first embodiment of the present invention. In a vehicle equipped with a fall prevention airbag device, the front bumper 12 provided at the front end of the vehicle body 11 is located at the frontmost position. The pedestrian collision detection sensor 13 is arranged in the protruding portion. This pedestrian collision detection sensor 13
Is a touch sensor whose contacts are made conductive when compressed by a collision load input from the front, and is capable of detecting a collision with a pedestrian or the like when the vehicle is traveling.

Further, a hood front airbag 15 and a hood side airbag 16, 16 which become continuous walls of a predetermined height when inflated and hood side airbags 16 and 16 are respectively provided at the front end portion and both side portions of the hood 14 at the front portion of the vehicle body. The inflator 10 and the inflator 10 are housed inside the hood 14 in the vicinity of the front end and inside the both sides, respectively.
Inside 17 is a windshield side airbag 1
8, 18 and an inflator (not shown) are stored. Further, a roof front airbag 20 and a roof side airbag 21 are provided at the front end and both sides of the roof portion 19.
And a special inflator (not shown) are housed inside the front end of the roof and inside both sides. Then, the pedestrian collision detection sensor 13
When a collision of a pedestrian is detected, each of the inflators 10
Ignition current is applied to the air bags 15, 1
The gas generated by the inflator 10 is connected to 6, 18, 20, and 21.

Next, the operation of this embodiment configured as described above will be described. When a running vehicle collides with a pedestrian, the pedestrian collision detection sensor 13 attached to the front bumper 12 is compressed by the collision load and the contacts are brought into conduction, and the hood front airbag 15 and the hood side airbag 16, 16 each dedicated inflator 10
Apply an ignition current to the. Then, the gas generated by the inflator 10 inflates and deploys the airbag on the front end portion and both side portions of the hood 14 into a continuous wall shape having a predetermined height,
The periphery of the hood 14 is surrounded by the wall of the airbag, and the windshield side airbags 18, 18 are inflated in a continuous wall shape on the front surfaces of the front pillar portions 17, 17 to surround both sides of the windshield. Further, the roof front airbag 20 and the roof side airbags 21 and 21 are inflated and deployed in a continuous wall shape at the front end and both side portions of the roof portion 19 so that the periphery of the roof portion 19 is surrounded by the wall of the airbag.

Therefore, a pedestrian who has made a secondary collision on the hood 14, or on the windshield or the roof portion 19 is caused by the continuous wall-shaped airbags 15, 16, 18, 20, 21 at the respective positions. The impact is alleviated and movement to the outside of the vehicle body is restricted, and the hood 1
It is possible to prevent a pedestrian from falling on the road surface from above the vehicle 4, the windshield, or the roof portion 19.

In the above embodiment, the hood 14
The case where the independent airbag and the inflator are used for the front end and both sides of the roof part 19 and the front end and both sides of the roof part 19 and both front pillar parts 17 have been described, but as shown in FIG. On both sides,
The left and right front pillars 17 and the airbags arranged on both sides of the roof portion 19 communicate with each other to form airbags 26, 26, and are arranged at the front end of the hood 14 and the front end of the roof portion 19. The two rows of airbags 26, 26 may be communicated with each other by the airbags 26a, 26b to form an integral airbag. In this case,
When a pair of inflators (not shown) are provided at both ends of an airbag 26a communicating the airbags 26 on both sides at the front end of the hood 14, which is the front part of the vehicle body, and when a collision with a pedestrian is detected. Further, an ignition current is passed through the pair of inflators to generate gas, and the airbag 26, which is in communication with the entire inflator, is inflated and deployed from the front end side of the vehicle body to the rear side.

Therefore, since the airbag is integrally formed and the number of inflators can be reduced, it is easy to secure a space for accommodating the inflators, and wiring between the sensor and the inflators can be reduced, resulting in cost reduction. It has the effect of being able to achieve.

FIGS. 4 to 6 show a second embodiment of the present invention. An unillustrated opening for inflating an air bag is formed near the front end of the hood 34 of the vehicle body 31, and this opening is also formed. A hood airbag 35 is stored in the section, which inflates when a collision with a pedestrian is detected, expands from the opening, and expands on the upper surface of the hood 34. Further, an opening (not shown) is formed near the front end of the roof portion 39, and when the collision with the pedestrian is detected, the opening is expanded in the opening like the hood airbag 35. A roof airbag 40 that further expands and expands on the upper surface of the roof portion 39 is stored.

When the hood airbag 35 is inflated, continuous wall portions 35a having a constant height are formed so as to rise vertically on the four sides of the peripheral edge portion thereof. It has a box shape. Similarly, when the roof airbag 40 is inflated, continuous wall portions 40a having a constant height are formed so as to rise vertically on the four sides of the peripheral portion thereof, and have a bottomed box shape. Is presenting.

Next, the operation of this embodiment configured as described above will be explained. When a running vehicle collides with a pedestrian, a pedestrian collision detection sensor attached to the front bumper 32 at the front end of the vehicle. 33 is conducted to apply an ignition current to an inflator (not shown), and the hood airbag 35 is inflated and deployed by the gas generated in the inflator. Since the hood airbag 35 has continuous wall portions 35a that rise vertically from its four sides, the bottom portion and the continuous wall portion 35a of the box-shaped hood airbag 35 can prevent a pedestrian from a secondary collision. The impact can be mitigated, and movement of a pedestrian can be restricted by the vertically rising continuous wall portion 35a to prevent the pedestrian from falling onto the road surface.

Similarly, the roof airbag 40 is inflated and deployed on the roof portion 39 by being filled with the gas generated by the inflator. The bottom portion of the roof airbag 40 and the continuous wall portion 40a can cushion a pedestrian who has collided, and the vertically continuous continuous wall portion 40a restricts the movement of the pedestrian from the roof airbag 40 to the road surface. It is possible to prevent falling.

In the above embodiment, the hood airbag 35 and the roof airbag 40 have been described in the case where the continuous walls 35a, 40a are provided on four sides to form a square shape. As shown in FIG. 5, for example, the hood airbag 50 may be provided with the continuous walls 50a, 50a only on both sides thereof, and as shown in FIG. Even if the hood side airbag 70 is inflated and deployed, substantially the same effect can be obtained.

Further, FIGS. 7 to 11 show a third embodiment of the present invention.
In the embodiment, an opening (not shown) is formed in the vicinity of the front end of the hood 84 of the vehicle body 81, and the inside of this opening bulges outward from the opening and the upper surface of the hood 84 and the windshield 88. Air bag 85 that extends so as to cover from the front surface of the vehicle to the front edge of the roof 89.
Similarly, at the front end of the hood 84, which bulges from the opening, a second airbag 86 that expands and deploys in a wall shape continuous in the vehicle body width direction is stored. The second airbag 86 is a fall-prevention airbag, and is a preset predetermined time (for example, 5 seconds) after the first airbag 85 starts to deploy.
After 0 to 100 ms), it will be delayed and deployed.

The first airbag 85 and the second airbag 86 are separately provided in a first case 85a and a second case 86a attached to the lower surface side near the front end of the hood 84 as shown in FIG. The first airbag inflator 85b and the second airbag inflator 85b, which are respectively folded and housed in the engine compartment, are respectively disposed in the front side both sides of the engine room where heat influence is small.
The gas generated by the airbag inflator 86b is
Inflator side duct 85 with the hood 84 closed
Air bag side ducts 85d for connecting the tips to the inside of the funnel-shaped upper ends of the c and 86c,
It is adapted to be supplied to both of the airbags 85 and 86 via 86d.

As shown in FIG. 11, the inflators 85b and 86b for the first airbag and the second airbag are each provided with an electric heater 91a for ignition and a transfer agent at substantially the center of a metal case 90. Squib 91 consisting of 91b
The gas generating agent 92 is provided around the squib 91.
The structure is filled with. Then, the gas generated from the ignited gas generating agent 92 is filtered by the screen 93 to filter out sparks and foreign matter and is cooled,
It is designed to blow out into the ducts 85c and 86c.

Next, the operation of this embodiment configured as described above will be explained. When a running vehicle collides with a pedestrian, as shown in the block diagram of FIG. 9, the front bumper 82 at the front end portion of the vehicle. The pedestrian collision detection sensor 83 attached to the vehicle is conducted, and the controller 9 having a timer function is connected.
The detection signal is input to 4. The controller 94, to which the detection signal has been input, controls the first airbag inflator 85b.
To the second airbag inflator 86b after a predetermined time (for example, 50 to 100 ms) is delayed.

Therefore, by dividing the first air bag 85 and the second air bag 86, the volume of the first air bag 85 to be inflated first is reduced to shorten the time required for deployment. The first airbag 85 deploys in a short time so as to cover the hood 84, the windshield 88, and the front edge of the roof 89, and absorbs the impact of a pedestrian who makes a secondary collision with the hood 84 or the like and can be reliably protected. And the second airbag 86 after a predetermined time delay.
However, since it inflates like a wall in the vicinity of the front end of the hood 84, the second airbag 86 prevents the pedestrian from moving forward due to inertial force during braking, and the pedestrian from the top of the hood 84 to the road surface. Can be prevented from falling.

As described above, according to the fall prevention airbag of the present embodiment, it is possible to reduce the impact when a pedestrian who collides with the hood 84 and the like is alleviated and to prevent the fall from the hood 84 onto the road surface. You can

The second airbag 86 for preventing the fall
Is deployed after being delayed by a predetermined time from the first airbag 85, so that the first airbag 85 may be in an unintended direction that may occur when the second airbag 86 is inflated and deployed at the same time as the first airbag 85. It is possible to prevent erroneous deployment and delay of deployment.

In the above embodiment, the case where the controller 94 having the timer function is used as a means for delaying the deployment timing of the second airbag 86 has been described. Bag 86
As another means for inflating the first airbag 85 by delaying by a predetermined time, there is a method of detecting a certain state of the first airbag 85 to be deployed first and igniting the second airbag inflator 86b. For example, after a pressure sensor is provided in the first airbag 85 to detect that the internal pressure of the first airbag 85 exceeds a predetermined pressure, or after the internal pressure rises and reaches a peak. There is a method of igniting the second airbag inflator 86b when it detects that a predetermined pressure is exceeded, for example, by detecting a pressure inflection point at which it starts to fall. Further, on the vehicle body side such as the upper surface of the hood 84, a contact sensor for detecting the deployed state of the first airbag 85, a contact sensor such as a pressure sensor, or a non-contact sensor such as a photo sensor is provided. First airbag 85 to be deployed
There is a method of igniting the second airbag inflator 86b by detecting that the vehicle has expanded to a predetermined position. Also,
Two separated points on the inner surface of the first airbag 85 or the first
A conducting wire is provided between the airbag 85 and the vehicle body side, and when the first airbag 85 expands by a certain amount or more, the conducting wire is pulled and broken, and the breaking of the conducting wire is electrically detected to detect the second air. There is a method of igniting the bag inflator 86b. Further, the other end of the string member, one end of which is attached to the first airbag 85, is connected to the mechanical ignition mechanism of the second airbag inflator, and the first airbag 85 is deployed by a predetermined amount and the string member. There is a method of mechanically igniting the inflator by pulling the inflator.

12 to 14 show a fourth embodiment of the present invention, in which an opening (not shown) for inflating an airbag is formed near the front end of the hood 104 of the vehicle body 101. An air bag storage portion is provided in the opening portion, and the air bag storage portion bulges outward from the opening portion and the upper surface of the hood 104 and the windshield 1.
A first airbag 105 that is deployed in a substantially rectangular shape so as to cover from the front surface of 07 to the front edge of the roof 108, and a second airbag that is formed separately from the first airbag 105 and that is deployed at the peripheral portion thereof. And 106 are stored.
The second airbag 106 is integrally sewn on the peripheral portion of the first airbag 105, is pulled out integrally with the first airbag 105 that swells from the opening, and The air bag is inflated with a delay of a predetermined time and deployed in a continuous wall shape surrounding the peripheral edge of the first airbag 105. Further, dedicated inflators 105a and 106a are connected to the first and second airbags 105 and 106, respectively.

As described above, in the second airbag 106, an ignition current flows through the inflator 106a after a predetermined time (for example, 50 to 100 ms) elapses after the first airbag starts to be deployed, The gas generated by the inflator 106a is supplied and inflated. This second airbag 106 is
As a means for inflating the airbag 105 after delaying it for a predetermined time, the same method as in the third embodiment can be adopted.

Therefore, the second airbag 106 is pulled out from the opening integrally with the first airbag 105 which is inflated and deployed in advance, but the second airbag 106 is pulled out in an uninflated state. Airbag 10
5 can be smoothly developed without hindering the development. Further, the hood 10 is provided by the second airbag 106.
4 It is possible to prevent pedestrians from falling on the road from above.

FIG. 15 shows another embodiment of the fall prevention airbag of the fourth embodiment. In the fourth embodiment, the first airbag 105 and the second airbag 105 of the third embodiment described above are shown. The bag 106 and the inflator 10 are different from each other.
5a and 106a, the inflator 105a is ignited to inflate the first airbag 105 first, and after a certain time has passed, the inflator 1
While 06a is ignited and the second airbag 106 is delayed and deployed, the first airbag is first deployed by one inflator, and then the second airbag is delayed by a certain time. I tried to expand it,
It will be described with reference to FIG.

At the peripheral portion of the first airbag 115 which is deployed on the hood 114 of the vehicle body, when it is deployed, it is overlaid on the upper portion of the first airbag 115 and is deployed in the shape of a raised wall.
An airbag 116 is integrally sewn on the upper surface of the first airbag 115, and the second airbag 1
The gas that inflates 16 is supplied from the same inflator 117 that inflates the first airbag 115. That is, the foldable first duct 115a, which is connected to the inflator 117 so as to supply gas to the first airbag 115, and the first airbag 115 are formed so as to penetrate the first airbag 115 in a thickness direction in an airtight manner. The second airbag 1 is inserted through the inserted insertion holes 115b and 115b.
Foldable second ducts 116a and 116a, which are connected in communication with each other so as to supply gas, are attached to the respective parts 16. Reference numeral 114a in FIG. 15 is an airbag storage portion, and 115c is a tether (strap) that connects the cloth material on the upper and lower surfaces of the first airbag 115, and restricts the inflation thickness of the first airbag 115. I'm trying to develop it in a matte shape.

The second airbag 116 is integrally folded with a part thereof sewn onto the upper surface of the peripheral portion of the first airbag 115, and is accommodated in an opening formed in the hood 114. There is. Then, in this folded state, the second ducts 116a, 116a for supplying gas to the second airbag 116 are sandwiched between the folded first airbag 115 and are in a non-communication state. There is.

Therefore, when a collision with a pedestrian is detected and the inflator 117 is ignited, the generated gas is supplied to the first airbag 115 through the first duct 115a. At this time, the second duct 116a, 116a,
Since the insertion holes 115b and 115b are folded, they are not yet in communication with each other, and no gas is supplied to the second airbag 116, so only the first airbag 115 is inflated and deployed first. Then, when a predetermined time (for example, about 50 to 100 ms) has elapsed from the start of the deployment of the first airbag 115, the deployment of the first airbag 115 proceeds and the insertion hole 11
The portions 5b and 115b are also expanded to form through holes, and the second ducts 116a inserted into the insertion holes 115b communicate with each other to start gas supply to the second airbag 116.
As a result, one inflator 117 can deploy the first airbag 115 and the second airbag 116 at different deployment timings, and the same operation as in the case of the fourth embodiment described above. And the effect is obtained.

FIG. 16 shows a fifth embodiment of the present invention. In the fourth embodiment, two airbags are inflated at different deployment times, whereas the fifth airbag is inflated. In the embodiment, the three airbags are deployed with the deployment timing shifted in three stages, which will be described below with reference to the drawings. The same components as those of the third embodiment shown in FIG. 8 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the vicinity of the front end of the hood 84 of the vehicle body 81, there is provided a first airbag 85 which extends so as to cover the upper surface of the hood 84 and the front surface of the windshield 88 to the front edge portion of the roof 89, and the front end of the hood 84. A second airbag 86 that inflates and deploys in a wall shape that is continuous in the vehicle body width direction, and a third airbag 87 that inflates and deploys in a wall shape that is continuous in the vehicle body width direction are provided on the upper surface of the first airbag 85. Has been. The first airbag 85 and the second airbag 86 are each provided with a dedicated inflator,
As in the case of the third embodiment, the second controller for preventing the first airbag 85 from dropping from the hood to the front of the vehicle body after a predetermined time (for example, 70 to 120 ms) has passed by the controller such as a timer. The airbag 86 is adapted to be deployed.

The third air bag 87 is connected to an inflator (not shown) for inflating and deploying the first air bag 85 without holding a dedicated inflator, and is arranged in the first air bag. The gas is expanded and deployed by the gas supplied through the duct (not shown). In addition, the third airbag 87 is folded and stored together with the first airbag 85 at the time of storage. Therefore, the first airbag 85 expands to some extent, and the gas flows through the duct that has been integrally folded. When possible, the gas sent through the duct is inflated and deployed, and the volume of the third airbag 87 is made smaller than that of the second airbag 86 so that the first airbag 85 is deployed. It is set so as to be developed in a short time after about 100 ms has elapsed after the start of.

Therefore, after the first airbag 85 starts to deploy, the third airbag 87 starts to deploy about 100 ms later, and the second airbag 68 deploys after a predetermined time (for example, within 20 ms) later. Is set.

Next, the operation of this embodiment configured as described above will be described. When the traveling vehicle 81 collides with a pedestrian, a pedestrian collision detection sensor 83 attached to the front bumper 82 is provided. Is detected, the inflator of the first airbag 85 is ignited, and the first airbag 85 first deploys so as to cover the hood 84. Approximately 100m after the first airbag 85 starts to deploy
When s has passed, it is arranged in the first airbag 85,
Moreover, the duct that has been folded together with the first airbag 85 is released from the regulation, and the gas can flow inside the duct, and the gas is supplied to the third airbag 87 through this duct, and the wall Expands and expands into a shape. Then, after a lapse of a predetermined time (for example, 70 to 120 ms) after the first first airbag 85 starts to deploy, the second airbag 86
An ignition current is applied to the inflator for use in the second airbag 86 by the gas generated in the ignited inflator.
However, it develops like a wall in the width direction of the vehicle body.

Therefore, the pedestrian who has collided with the vehicle first absorbs the impact of the secondary collision with the hood 84 by the first airbag 85 deployed on the hood 84. Then, the forward movement on the hood 84 is restricted by the third airbag 87 that is deployed in a wall shape on the front upper surface of the first airbag 85, and the second airbag 86 that is deployed last is provided. This prevents the forward movement due to inertial force and the fall from the hood 84 onto the road surface in front of the vehicle body.

As described above, according to the fall prevention airbag of this embodiment, it is possible to reduce the impact when a colliding pedestrian collides with the hood 84, etc. Can be prevented from falling.

Further, since the third airbag 87 and the second airbag 86 for preventing the fall are deployed after being delayed by a predetermined time from the first airbag 85, the third airbag 87 and the second airbag 86 are provided with the first airbag 87. It is possible to prevent erroneous deployment of the first airbag 85 in an unintended direction, which may occur when inflated and deployed at the same time as the airbag 85, and delay of deployment.

17 to 19 show a sixth embodiment of the present invention, in which hood airbags 125a and 125a are provided on both sides of the vehicle body 121 near the rear end of the hood 124.
Storage recesses 124a and 124b for respectively storing 25b
Are formed, and both storage recesses 124a and 124b are formed.
Is closed so as to be openable and closable by lids 126a and 126b that rotate about an axis 128 parallel to the vehicle body center line. The hood airbags 125a and 125b are folded and stored in the storage recesses 124a and 124b, respectively, and the inflator 12 disposed at the bottom of the recesses.
7a and 127b are expanded by the gas generated, and the lids 126a and 126b are pushed open to bulge outward and spread on the hood 124. Then, when the airbag is inflated, both hood airbags 12
By the pressure of 5a, 125b, both lids 126a,
126b are respectively pressed, and as shown in FIG.
The shaft 12 reaches the position where its lower end contacts the stopper 129.
Each of the hood airbags 12 is rotated outwardly about 8 to form a predetermined angle with respect to the hood surface.
Both sides of the vehicle body of 5a and 125b are raised upward to serve as fall prevention portions. In FIG. 17, reference numeral 122 is a bumper, 123 is a pedestrian collision detection sensor, and FIG.
In FIG. 9, reference numeral 128a is a hinge to which the lids 126a and 126b are attached, and 129a is the lid 12 that has been opened.
6a, 126b is a leaf spring that restricts the rotation in the closing direction.

Next, the operation of this embodiment configured as described above will be described. When a pedestrian collision detection sensor 123 detects a collision with a pedestrian while the vehicle is traveling, the inflators 127a and 127b are ignited, and the hood airbags 125a and 125b are inflated by the generated gas. At this time, both hood airbags 125a and 125b
The respective parts on the center side of the vehicle body overlap each other to enhance the shock absorbing action of the central part. When the hood airbags 125a and 125b are inflated and deployed to predetermined positions, the hood airbags 125a and 125b are expanded.
The lids 126a and 126b are opened in a substantially V-shape (see FIG. 17) at a position where the lids 126a and 126b face each other by a pressure of 5b, and both side portions of the hood airbags 125a and 125b are bent upward to form the fall-preventing portions.

Therefore, the pedestrian who has collided with the hood 124a by the hood airbags 125a and 125b.
The impact of the collision with the vehicle is absorbed, and the fall prevention portions that stand up on both sides of the hood 124 prevent the hood 124 from falling from the left and right sides of the vehicle body to the road surface.

20 and 21 show a seventh embodiment of the present invention, in which a housing recess 134a for housing the hood airbag 135 is formed near the front end of the hood 134 of the vehicle body 131, Both storage recesses 134
a and 134a are axes 138 in a direction orthogonal to the vehicle body center line.
Two lids 1 that rotate around a and 138b, respectively
It is closed by 36a and 136b so as to open in a double door. The hood airbag 135 is folded and stored in the storage recess 134a, and an inflator 137 is attached to the bottom portion of the hood airbag 135. The gas generated by the inflator 137 inflates the hood airbag 135. The lids 136a and 136b are pushed open in a double-door manner to bulge outward and expand on the hood 134.

The inside of the hood airbag 135 is
An airbag body 135b that is deployed on the hood 134 toward the rear of the vehicle body by the sheet-shaped partition wall material 135a,
It is partitioned into an airbag front portion 135c that extends from the storage recess 134a to the front side of the vehicle body, and the partition wall member 135a is connected to a pressure-sensitive valve that opens when the internal pressure of the airbag exceeds a certain pressure or is always in communication. Pore 135d
Is provided. Also, the airbag front portion 135c
The part that comes into contact with the lid 136a on the front side of the vehicle body when it expands is previously bonded to the lid 136a. In addition,
In FIG. 20, reference numeral 132 is a front bumper and 133 is a pedestrian collision detection sensor.

Next, the operation of this embodiment configured as described above will be described. When the pedestrian collision detection sensor 133 detects a collision with a pedestrian while the vehicle is traveling, the inflator 137 is ignited, and the hood airbag 135 is inflated by the generated gas. At this time, the inside of the hood airbag 135 is formed by a sheet-shaped partition wall material 135a, and an airbag front portion 135c on the front side of the vehicle body with respect to the storage recess 134a and an airbag body 135 on the rear side thereof.
It is divided into b. Therefore, the airbag body 1
The gas supplied to the side 35b is structured so that it cannot be supplied to the side of the airbag front portion 135c unless it passes through a pressure-sensitive valve provided in the partition wall material 135a or the pores 135d. Then, first, the airbag body 135b is inflated and deployed, and the airbag body 135b absorbs the impact when a pedestrian collides with the hood 134. Then, the airbag front portion 135c of the hood airbag 135 has a predetermined time (for example,
80 to 100 ms), the gas gradually filled through the pores 135d reaches a certain amount, or the internal pressure of the airbag body 135b reaches a certain pressure to pass through the pressure sensitive valve opened. Gas flows in. And
Until the airbag front portion 135c is inflated, the lid 136a on the front side of the vehicle body is held at the position shown by the chain double-dashed line in FIG. 21, that is, at the position where the lid 136a is inclined rearward. When the lid 136a is pushed forward by the inflating airbag front portion 135c, the airbag front portion 135c serves as a fall-prevention portion, and the hood 134
When an upper pedestrian moves forward due to inertial force due to braking or the like, the pedestrian is caught by the fall prevention portion, that is, the airbag front portion 135c, and is prevented from falling to the road surface.

Therefore, in this embodiment, since the front part 135c of the airbag is adhered to the lid 136a, the rear lid 136b and the front lid 136a together with the rear lid 136b are inflated by the pressure to inflate and deploy the airbag body 135b.
When the lid is pushed open, the front lid 136a is prevented from inclining to the front side, so that a pedestrian can prevent the lid 136a from leaning forward.
There is no problem even if it comes into contact with.

Further, when a pedestrian is buffered by the airbag main body 135b deployed on the hood 134, the internal pressure rises, the gas passage to the airbag front portion 135c is opened, and gas is supplied to the airbag front portion. It is also possible that the lid 136a is pushed outward by the expansion of the 135c with a delay and the airbag front portion 135c rises to form the fall prevention portion.

[0056]

As described above, in the fall prevention airbag device of the present invention, when the pedestrian collision detection means detects a collision with a pedestrian, the peripheral portions of the hood and roof and the pillar portion are respectively detected. The wall-shaped inflatable airbag prevents pedestrians who collide with the hood, roof, or windshield from falling from the hood or roof to the road surface due to the wall-inflated airbag. Therefore, a pedestrian can be protected from a collision with a road surface or a contact with a following vehicle after falling.

Further, if the peripheral portion of the airbag that inflates and deploys on the hood and the roof is formed into a wall shape, the impact to the pedestrian who has made a secondary collision on the hood or on the roof is mitigated and at the same time, the peripheral edge is reduced. The wall-shaped part of the section prevents a pedestrian from falling onto the road surface, and can protect the pedestrian from a collision with the road surface or a contact with a following vehicle after the fall.

Furthermore, the volume of the first airbag which is deployed on the hood or on the hood and on the roof is reduced so that the airbag can be deployed in a short time.
Since the second airbag disposed on at least one of the upper surface and the peripheral portion of the airbag is deployed with a delay of a predetermined time, the first airbag is generated in the unintended direction caused by the simultaneous deployment of the second airbag. It is possible to prevent erroneous deployment. Therefore, the impact on the pedestrian who has made a secondary collision on the hood or the roof is absorbed by the first airbag. Furthermore, the pedestrian can be prevented from falling onto the road surface by the second airbag that is deployed on the upper surface or the peripheral portion after a predetermined time delay.

Further, when the lid for closing the air bag accommodating portion formed on the peripheral portion of the hood is opened by the pressure of the inflating airbag, the lid raises the peripheral portion of the airbag upward and falls. Since the prevention part was formed,
The impact on the pedestrian that has a secondary collision on the hood or on the roof is mitigated, and the fall prevention part formed on the peripheral portion of the airbag prevents the pedestrian from falling to the road surface. It is possible to protect pedestrians from contact with the following vehicles after the fall.

[Brief description of drawings]

FIG. 1 is a perspective view of a vehicle equipped with a fall prevention airbag device according to a first embodiment of the present invention.

FIG. 2 is a schematic explanatory view showing an attached state of an airbag and an inflator.

FIG. 3 is an explanatory view showing a deployed state of the airbag when the airbag is formed in series.

FIG. 4 is a perspective view of a vehicle equipped with a fall prevention airbag device according to a second embodiment of the present invention.

FIG. 5 is a perspective view showing another example of the hood airbag in the second embodiment.

FIG. 6 is a perspective view showing another example of the hood airbag in the second embodiment.

FIG. 7 is a perspective view of a vehicle equipped with a fall prevention airbag device according to a third embodiment of the present invention.

FIG. 8 is a side view of a fall prevention airbag device according to a third embodiment.

FIG. 9 is a block diagram showing an operation of a fall prevention airbag device according to a third embodiment.

FIG. 10 is a side view showing an attached state of the airbag and the inflator of the third embodiment.

FIG. 11 is a sectional side view of an inflator used in the third embodiment.

FIG. 12 is a perspective view of a vehicle equipped with a fall prevention airbag device according to a fourth embodiment of the present invention.

FIG. 13 is a side view of a fall prevention airbag device according to a fourth embodiment.

14 is a sectional view taken along line XIV-XIV of FIG.

FIG. 15 is a view corresponding to FIG. 14 showing another example of the fall prevention airbag device according to the fourth embodiment.

FIG. 16 is a side view of a fall prevention airbag device according to a fifth embodiment of the present invention.

FIG. 17 is a perspective view of a vehicle equipped with a fall prevention airbag device according to a sixth embodiment of the present invention.

18 is a sectional view taken along line XVIII-XVIII in FIG.

FIG. 19 is an enlarged view of an essential part of FIG.

FIG. 20 is a side view of a vehicle equipped with a fall prevention airbag device according to a seventh embodiment of the present invention.

FIG. 21 is an enlarged cross-sectional side view of essential parts showing an open state of the lid of the seventh embodiment.

FIG. 22 is a schematic explanatory view of a vehicle provided with a conventional pedestrian protection means.

[Explanation of symbols]

 10 Inflator 12 Front Bumper 13 Pedestrian Collision Detection Sensor 14 Hood 15 Hood Front Airbag 16 Hood Side Airbag 17 Front Pillar 18 Windshield Side Airbag 19 Roof Part 20 Roof Front Airbag 21 Roofside Airbag 26 Integrated Airbag 35 Hood Airbag 35a Continuous Wall 40 Roof Airbag 40a Continuous Wall 50 Hood Airbag 50a Continuous Wall 60 Hood Airbag 70 Hood Side Airbag 85 First Airbag 86 Second Airbag

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiaki Hosoya 1st Toyota Town, Toyota City, Aichi Prefecture Toyota Automobile Co., Ltd. (72) Inventor Hiroki Obara 2-Chome, Asahi Town, Kariya City Aichi Prefecture Aisin Seiki Co., Ltd. (72) Inventor Naoji Sakakibara, Aichi Prefecture Kariya City, Asahi Town, 2-chome, Aisin Seiki Co., Ltd.

Claims (4)

[Claims] 1. A pedestrian collision detection means for detecting a collision with a pedestrian, air installed on a hood of a vehicle body, a peripheral portion of a roof, and a front pillar portion, and inflated and expanded to the outside in a wall shape at each position. A fall prevention airbag device, comprising: a bag; and an inflator that generates gas to inflate and deploy the airbag when the pedestrian collision detection means detects a collision with a pedestrian. 2. A pedestrian collision detection means for detecting a collision with a pedestrian, an airbag which is inflated and deployed on a hood of a vehicle body and on a roof and has a wall portion at its peripheral portion, and the pedestrian collision detection means. A fall prevention airbag device, comprising: an inflator for generating gas to inflate and deploy the airbag when a collision with a pedestrian is detected. 3. A pedestrian collision detection means for detecting a collision with a pedestrian, and a first airbag which is inflated and deployed at least on a hood of a vehicle body when the pedestrian collision detection means detects a collision with a pedestrian. A second airbag which is inflated and deployed in a wall shape on at least one of an upper surface and a peripheral portion of the first airbag after a predetermined time has elapsed from the start of deployment of the first airbag. Fall prevention airbag device. 4. A pedestrian collision detection means for detecting a collision with a pedestrian, and an air bag housed in a housing part that is opened at a peripheral portion of a hood of a vehicle body and that is opened and closed by a lid. And an inflator for inflating and deploying gas on the hood by generating gas when the pedestrian collision detection means detects a collision with a pedestrian, and when the airbag is inflated and deployed, the air A fall prevention airbag device, comprising: a lid holding means for holding the lid so that a peripheral edge portion of the bag is raised to form a fall prevention portion.