JP3005627B2 - Fall prevention airbag device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag for preventing a pedestrian once falling on a hood or a roof of a vehicle from falling onto a road surface when the running vehicle collides with the pedestrian. It concerns the device.

[0002]

2. Description of the Related Art When a running vehicle collides with a pedestrian, it is known that the pedestrian who has collided has its lower body paid off by the front of the vehicle body and makes a secondary collision with the upper surface of the hood at the front of the vehicle body. I have. For example, FIG. 22 shows U.S. Pat. No. 4,249,632.
FIG. 1 shows a safety device for protecting a pedestrian disclosed in Japanese Patent Application Laid-Open Publication No. H11-157, and when a collision of a pedestrian 4 is detected by a sensor 3 provided on a bumper 2 at a front end of a vehicle 1, The airbag 6 installed at the lower rear end is inflated and deployed,
By lifting the rear end side of the hood 5 elastically upward, the impact of the pedestrian 4 in the event of a secondary collision with the hood 5 is reduced.

[0003]

However, in the above-mentioned conventional safety device for protecting a pedestrian, the impact when the pedestrian 4 colliding with the vehicle makes a secondary collision with the hood 5 can be absorbed. The pedestrian 4 who has fallen on 5 may move on the hood and fall from the edge 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 airbag is inflated in a wall shape around the periphery of the hood, and the hood or the like is once inflated. An object of the present invention is to provide an airbag device that prevents a pedestrian on the vehicle from falling.

[0005]

As a means for solving the above-mentioned problems, a fall prevention airbag device according to the present invention comprises:
A pedestrian collision detecting means for detecting a collision with a pedestrian; an airbag which is installed at a peripheral portion of a hood and a roof of a vehicle body and a front pillar portion and inflates and deploys in a wall shape at each position; An inflator for inflating and deploying the airbag when the detection means detects a collision with a pedestrian is provided.

In addition, a pedestrian collision detecting means for detecting a collision with a pedestrian, an airbag inflated and deployed on a hood and a roof of a vehicle body and having a wall at a peripheral edge thereof, Has an inflator for inflating and deploying each of the airbags when a collision with a pedestrian is detected.

Further, a pedestrian collision detecting means for detecting a collision with a pedestrian, and a first airbag inflated and deployed at least on a hood of a vehicle body when the pedestrian collision detecting means detects a collision with a pedestrian. After a lapse of a predetermined time from the start of deployment of the first airbag, the second airbag inflates and deploys on at least one of the upper surface and the peripheral portion of the first airbag.
An airbag is provided.

Further, a pedestrian collision detecting means for detecting a collision with a pedestrian, and an opening at a periphery of a hood of the vehicle body,
And, when the pedestrian collision detection means detects a collision with a pedestrian, the airbag is inflated onto a hood when the pedestrian collision detection means detects a collision with a pedestrian. With an inflator to be deployed, when the airbag is inflated and deployed,
A lid holding means for holding the lid so that a peripheral edge of the airbag rises to form a fall prevention portion is provided.

[0009]

With the above construction, when the pedestrian collision detecting means detects a collision with the pedestrian, the airbag is formed into a wall shape on the peripheral edge and the pillar of the hood and the roof by the gas supplied from the inflator. Expand and deploy to surround the hood, roof and windshield. Therefore, the pedestrian who has collided with the hood or roof or the windshield is restricted from moving by the airbag inflated and deployed in the shape of a wall, is held on the hood or roof, and is prevented from falling onto the road surface. You.

When a collision with a pedestrian is detected, the gas supplied from the inflator inflates and deploys the airbag to cover the top of the hood and the roof and inflates and deploys the respective peripheral edges in a wall shape. The impact on the pedestrian who has made a secondary collision on the hood or on the roof is reduced, and the pedestrian is prevented from falling onto the road surface by a wall-shaped portion at the periphery thereof.

When a collision with a pedestrian is detected, the first airbag is first deployed by the gas supplied from the inflator so as to cover the hood or the hood and the roof, and collides 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 onto the road surface.

Further, the lid closing the storage portion of the airbag is pushed open by the airbag inflating and deploying on the hood, and the peripheral portion of the airbag rises to form the fall prevention portion. , Pedestrians who collided,
The impact of the collision on the hood is absorbed by the airbag, and the fall prevention unit prevents the hood from falling 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, a vehicle is provided with a front bumper 12 provided at the front end of the vehicle body 11 at the frontmost position. A pedestrian collision detection sensor 13 is provided at the protruding portion. This pedestrian collision detection sensor 13
Is a touch sensor that conducts when it is compressed by a collision load input from the front, and can detect a collision with a pedestrian or the like when the vehicle is running.

At the front end and both sides of the hood 14 at the front of the vehicle body, a hood front airbag 15 and hood side airbags 16 and 16 which become continuous walls of a predetermined height when inflated are respectively provided. Are housed inside the hood 14 near the front end and inside the both sides together with the inflator 10.
17, inside the windshield side airbag 1
8, 18 and an inflator (not shown) are stored. Also, a roof front airbag 20 and a roof side airbag 21
Are housed inside the front end of the roof part and inside the both sides together with dedicated inflators (not shown). The pedestrian collision detection sensor 13
Detects the collision of the pedestrian, the inflator 10
An ignition current flows through the airbags 15, 1
6, 18, 20, and 21 are connected so that the gas generated by the inflator 10 is supplied.

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 contact is conducted, and the hood front airbag 15 and the hood side airbag 16, 16 dedicated inflators 10
Apply ignition current to The gas generated by the inflator 10 inflates and deploys the airbag on the front end and both sides of the hood 14 into a continuous wall shape having a predetermined height.
The periphery of the hood 14 is surrounded by an airbag wall, and the windshield side airbags 18, 18 are inflated in a continuous wall shape in front 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, and the periphery of the roof portion 19 is surrounded by the wall of the airbag.

Therefore, a pedestrian who has collided on the hood 14, the windshield, or the roof 19 can be opened by the airbags 15, 16, 18, 20, 21 formed in continuous walls at the respective positions. The impact is reduced and the movement to the outside of the vehicle body is regulated,
It is possible to prevent a pedestrian from falling onto the road surface from above the vehicle 4, the windshield, or the roof 19.

In the above embodiment, the hood 14
The case where independent airbags and inflators are used for the front end and both side portions of the roof portion 19 and the front end portion and both side portions and both front pillar portions 17 of the roof portion 19 has been described. As shown in FIG. On both sides,
The airbags disposed on the left and right front pillars 17 and on both sides of the roof portion 19 are communicated with each other to form airbags 26, 26, and the front ends of the hood 14 and the front end of the roof portion 19 are disposed. The two rows of airbags 26, 26 can be communicated by the airbags 26a, 26b to form an integrated 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, when a collision with a pedestrian is detected. Then, an ignition current is caused to flow through the pair of inflators to generate gas, and the airbag 26, which is entirely connected, is inflated and deployed from the front end side of the vehicle body to the rear side.

Therefore, since the airbag is formed integrally and the number of inflators can be reduced, it is easy to secure a place for accommodating the inflator, and the number of wires between the sensor and the inflator can be reduced, and the cost can be reduced. It has the effect of achieving it.

FIGS. 4 to 6 show a second embodiment of the present invention. In the vicinity of the front end of a hood 34 of a vehicle body 31, an opening (not shown) for inflating an airbag is formed. A hood airbag 35 that is inflated when a collision with a pedestrian is detected, swells from the opening, and expands on the upper surface of the hood 34 is housed in the unit. An opening (not shown) is formed in the vicinity of the front end of the roof portion 39. When a collision with a pedestrian is detected similarly to the hood airbag 35, the opening expands. A roof airbag 40 that expands and expands on the upper surface of the roof portion 39 is housed.

When the hood airbag 35 is inflated, continuous walls 35a having a constant height are formed on four sides of a peripheral edge thereof so as to rise vertically, respectively. It has a square shape. Similarly, when the roof airbag 40 is inflated, continuous walls 40a having a constant height are formed on four sides of a peripheral edge thereof so as to rise vertically, respectively. Is presented.

Next, the operation of this embodiment constructed as described above will be described. When a running vehicle collides with a pedestrian, a pedestrian collision detection sensor attached to a front bumper 32 at the front end of the vehicle. 33 conducts, an ignition current flows through an inflator (not shown), and the hood airbag 35 is inflated and deployed by gas generated in the inflator. Since the hood airbag 35 has the continuous wall portion 35a that rises vertically from the four sides thereof, the bottom portion and the continuous wall portion 35a of the square-shaped hood airbag 35 allow the pedestrian to have a secondary collision. In addition to reducing the impact, it is possible to restrict the movement of the pedestrian by the continuous wall portion 35a that rises vertically to prevent the hood airbag from falling onto the road surface.

Similarly, the gas generated by the inflator is filled, and the roof airbag 40 is inflated and deployed on the roof portion 39. The bottom portion of the roof airbag 40 and the continuous wall portion 40a can buffer a pedestrian that has collided, and the vertical wall portion 40a restricts the movement of the pedestrian and restricts the movement of the pedestrian from above the roof airbag 40 to the road surface. Fall can be prevented.

In the above embodiment, the case where the hood airbag 35 and the roof airbag 40 are formed in a square shape by providing continuous walls 35a and 40a on four sides has been described. As shown in FIG. 5, for example, the hood airbag 50 may be provided with continuous walls 50a, 50a only on both sides, and together with the hood airbag 60, as shown in FIG. Even if the hood side airbag 70 is inflated and deployed, substantially the same effect can be obtained.

FIGS. 7 to 11 show a third embodiment of the present invention.
In the embodiment, an opening (not shown) is formed near the front end of a hood 84 of a vehicle body 81, and inside the opening, the upper surface of the hood 84 and a windshield 88 bulge out from the opening. Airbag 85 that is deployed so as to cover from the front of the vehicle to the front edge of the roof 89
Similarly, a second airbag 86 that expands from the opening and expands and deploys in a wall shape continuous in the vehicle width direction is stored at the front end of the hood 84. The second airbag 86 is an airbag for preventing falling, and after the first airbag 85 starts to be deployed, a predetermined time (for example, 5 seconds) is set.
After 0 to 100 ms), the image is developed with a delay.

As shown in FIG. 10, the first airbag 85 and the second airbag 86 are separately provided in a first case 85a and a second case 86a mounted on the lower surface near the front end of the hood 84. The first airbag inflator 85b and the second airbag inflator 85b are respectively disposed at portions of the engine room where heat influence is small on both sides of the front end.
The gas generated by the airbag inflator 86b is
With the hood 84 closed, the inflator side duct 85
The airbag side ducts 85d, 85c, 86c, 86c are connected to the inside of the funnel-shaped enlarged upper end portion by fitting the tip thereof.
The airbags 86 and 86 are supplied to 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 provided almost at the center of a metal case 90 with an electric heater 91a for ignition and a transfer agent. Squib 91 consisting of 91b
Is provided around the squib 91,
Is filled. Then, the gas generated from the ignited gas generating agent 92 is filtered by a screen 93 for filtering sparks and foreign matters, and is cooled.
It blows out into ducts 85c and 86c.

Next, the operation of this embodiment constructed as described above will be described. When a running vehicle collides with a pedestrian, as shown in the block diagram of FIG. The pedestrian collision detection sensor 83 attached to the controller is turned on, and the controller 9 having a timer function is provided.
4, a detection signal is input. The controller 94 to which the detection signal has been input is the first airbag inflator 85b.
And an ignition signal is sent to the second airbag inflator 86b with a delay of a predetermined time (for example, 50 to 100 ms).

Therefore, by dividing the first airbag 85 into the first airbag 85 and the second airbag 86, the volume of the first airbag 85 to be inflated first is reduced to reduce the time required for deployment. The first airbag 85 is deployed in a short time so as to cover the hood 84, the windshield 88, and the front edge of the roof 89, so that the impact of a pedestrian who collides with the hood 84 or the like in a secondary collision can be absorbed and reliably protected. And the second airbag 86 is delayed by a predetermined time.
Is inflated in the form of a wall near the front end of the hood 84, so that the second airbag 86 prevents the pedestrian from moving forward due to the inertial force during braking, and the pedestrian from the hood 84 to the road surface. Can be prevented from falling.

As described above, according to the airbag of the present embodiment, when a pedestrian collides with the hood 84 or the like, the impact can be reduced, and the fall from the hood 84 to the road surface can be prevented. Can be.

Further, a second airbag 86 for preventing falling is provided.
Is deployed a predetermined time later than the first airbag 85, so that the second airbag 86 is unintentionally directed to the first airbag 85, which may occur when the second airbag 86 is inflated and deployed simultaneously with the first airbag 85. Erroneous deployment and deployment delay can be prevented.

In the above embodiment, the case where the controller 94 having a timer function is used as means for delaying the deployment time of the second airbag 86 has been described. Bag 86
Another method for delaying the deployment of the first airbag 85 by a predetermined time is to detect a certain state of the first airbag 85 that is deployed first and ignite the second airbag inflator 86b. For example, a pressure sensor is provided in the first airbag 85 to detect that the internal pressure of the first airbag 85 has exceeded a predetermined pressure, or after the internal pressure has risen to a peak. There is a method of igniting the second airbag inflator 86b when it is detected that the pressure exceeds a predetermined pressure by detecting a pressure inflection point at which the airbag begins to drop. A contact sensor such as a touch sensor or a pressure sensor for detecting the deployment state of the first airbag 85 or a non-contact sensor such as a photo sensor is provided on the vehicle body such as the upper surface of the hood 84. Deploying first airbag 85
Has been deployed to a predetermined position, and there is a method of igniting the second airbag inflator 86b. Also,
Two spaced apart or first points on the inner surface of the first airbag 85
A conductor is provided between the airbag 85 and the vehicle body, and when the first airbag 85 is deployed by a certain amount or more, the conductor is pulled and broken, and the break of the conductor is electrically detected to detect the second airbag. There is a method of igniting the bag inflator 86b. Further, the other end of the string member having one end attached to the first airbag 85 is connected to the mechanical ignition mechanism of the inflator for the second airbag, and the first airbag 85 is deployed by a predetermined amount and the string member is expanded. There is a method in which the inflator is mechanically ignited by being pulled.

FIGS. 12 to 14 show a fourth embodiment of the present invention. In the vicinity of the front end of the hood 104 of the vehicle body 101, an opening (not shown) for inflating an airbag is formed. An airbag storage portion is provided in the opening, and the airbag storage portion swells out of the opening to the upper surface of the hood 104 and the windshield 1.
07, a first airbag 105 that is deployed in a substantially rectangular shape so as to cover from the front 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 on the peripheral edge thereof. 106 are stored.
The second airbag 106 is integrally sewn to the peripheral portion of the first airbag 105 and is pulled out integrally with the first airbag 105 swelling from the opening, and the second airbag 106 is The first airbag 105 is inflated with a delay of a predetermined time and expands into a continuous wall surrounding the periphery 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, the ignition current flows through the inflator 106a after a predetermined time (for example, 50 to 100 ms) has elapsed after the first airbag started to be deployed as described above. The gas generated by the inflator 106a is supplied and expands. This second airbag 106 is
As a means for deploying the airbag 105 after a predetermined time delay, a method similar to that of the third embodiment can be employed.

Therefore, although the second airbag 106 is pulled out of the opening integrally with the first airbag 105 that inflates and deploys first, the second airbag 106 is drawn out without being inflated. Airbag 10
5 can be smoothly deployed without hindering the development. Further, the hood 10 is provided by the second airbag 106.
4 It is possible to prevent a pedestrian from falling on the road surface 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 of the third embodiment are used. The bag 106 and the separate inflator 10
5a and 106a, the inflator 105a is ignited and the first airbag 105 is deployed first, and then after a predetermined time elapses, the inflator 1 is inflated.
06a was ignited and the second airbag 106 was deployed with a delay, whereas the first airbag was first deployed by one inflator, and then the second airbag was delayed by a certain time. It is intended to expand, below,
This will be described with reference to FIG.

At the periphery of the first airbag 115 which is deployed on the hood 114 of the vehicle body, a second wall which, when deployed, overlaps with the upper portion of the first airbag 115 and has a higher wall shape.
An airbag 116 is provided integrally on the upper surface of the first airbag 115 by sewing.
The gas for inflating the first airbag 115 is supplied from the same inflator 117 that inflates the first airbag 115. That is, the inflator 117 is formed by foldable first duct 115 a communicatively connected to supply gas to the first airbag 115, and formed in the first airbag 115 by airtightly penetrating its thickness direction. The second airbag 1 is inserted through the inserted insertion holes 115b, 115b.
Foldable second ducts 116a, 116a connected to each other to supply gas to 16 are attached. In FIG. 15, reference numeral 114 a denotes an airbag storage portion, and 115 c denotes a tether (strap) for connecting cloth materials on the upper and lower surfaces of the first airbag 115, and regulates the inflation thickness of the first airbag 115. It is designed to be deployed in a mat shape.

Then, the second airbag 116 is folded integrally with a part thereof sewn on the upper surface of the peripheral portion of the first airbag 115, and is housed in the opening formed in the hood 114. I have. In this folded state, the second ducts 116a, 116a for supplying gas to the second airbag 116 are in a non-communication state between the folded first airbags 115. I have.

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 ducts 116a, 116a
Since the insertion holes 115b and 115b are folded, they are not yet communicated with each other, and no gas is supplied to the second airbag 116, so that 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 inflated to form through holes, and the second ducts 116a inserted into the respective insertion holes 115b communicate to start gas supply to the second airbag 116.
As a result, the first airbag 115 and the second airbag 116 can be deployed at different deployment times by one inflator 117, and the operation is substantially the same as that of the fourth embodiment. And effects are obtained.

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

Near the front end of the hood 84 of the vehicle body 81, a first airbag 85 is deployed so as to cover the upper surface of the hood 84 and the front surface of the windshield 88 from the front edge of the roof 89. A second airbag 86 which inflates and deploys in a wall shape continuous in the vehicle body width direction, and a third airbag 87 which inflates and deploys in a wall shape continuous in the vehicle width direction on the upper surface of the first airbag 85. Have been. The first airbag 85 and the second airbag 86 each have a dedicated inflator,
Similarly to the case of the third embodiment, a controller such as a timer is used to prevent the first airbag 85 from being dropped from above the hood to the front of the vehicle body after a predetermined time (e.g., 70 to 120 ms) has elapsed after deployment. The airbag 86 is deployed.

The third airbag 87 is connected to an inflator (not shown) for inflating and deploying the first airbag 85 without holding a dedicated inflator, and is disposed in the first airbag. The gas is expanded and deployed by a gas supplied through a duct (not shown). When the third airbag 87 is stored, it is folded and stored together with the first airbag 85. Therefore, the first airbag 85 is expanded to some extent, and the gas flows through the duct that has been integrally folded. When this is possible, the gas sent through the duct expands and deploys. The third airbag 87 has a smaller volume than the second airbag 86, and the first airbag 85 deploys. Is set to be developed in a short time after about 100 ms elapses.

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 further deploys after a predetermined time (for example, within 20 ms). It is set as follows.

Next, the operation of this embodiment constructed as described above will be described. A pedestrian collision detection sensor 83 attached to the front bumper 82 detects that the traveling vehicle 81 has collided with a pedestrian. Is detected, the inflator of the first airbag 85 is ignited, and first, the first airbag 85 is deployed so as to cover the hood 84. About 100 m after the first airbag 85 starts deployment
After s elapse, the airbag is disposed in the first airbag 85,
In addition, the duct that has been folded integrally with the first airbag 85 is released from regulation, and gas can flow through the inside of the duct. The gas is supplied to the third airbag 87 through this duct, and It expands and develops into a shape. When a predetermined time (for example, 70 to 120 ms) has elapsed since the first first airbag 85 started to be deployed, the second airbag 86
An ignition current flows through the inflator for the second airbag 86 due to gas generated by the ignited inflator.
However, it unfolds like a wall in the vehicle width direction.

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 third airbag 87 that expands in a wall shape on the upper surface of the first airbag 85 near the front restricts the forward movement on the hood 84 and the second airbag 86 that expands last. This prevents the vehicle from moving forward due to the inertial force and falling from the top of the hood 84 to a road surface in front of the vehicle body.

As described above, according to the fall prevention airbag of the present embodiment, the impact when the pedestrian colliding with the hood 84 or the like can be reduced, and the pedestrian can be moved from the top of the hood 84 to the side of the vehicle body and to the front road surface. Can be prevented from falling.

Further, in order to deploy the third airbag 87 and the second airbag 86 for preventing falling down with a delay of a predetermined time from the first airbag 85, the third airbag 87 and the second airbag 86 are moved to the first airbag. It is possible to prevent erroneous deployment of the first airbag 85 in an unintended direction and delay in deployment that may occur when the first airbag 85 is inflated and deployed simultaneously with the airbag 85.

FIGS. 17 to 19 show a sixth embodiment of the present invention. Hood airbags 125a, 125 are provided on both sides near the rear end of a hood 124 of a vehicle body 121. FIG.
Storage recesses 124a and 124b for storing 25b respectively
Are formed, and both storage recesses 124a and 124b are formed.
Is opened and closed by lids 126a and 126b that rotate about a shaft 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.
The lids 126a and 126b are expanded by pushing and opening the lids 126a and 126b, respectively, and expand on the hood 124. When the airbag is inflated, both hood airbags 12
5a, 125b, the two lids 126a,
126b are respectively pressed, as shown in FIG.
The shaft 12 is moved until the lower end thereof contacts the stopper 129.
8 around the hood surface to form a predetermined angle with respect to the hood surface.
The both sides of the vehicle body 5a and 125b are made to rise upward, respectively, to form a fall prevention portion. In FIG. 17, reference numeral 122 denotes a bumper, 123 denotes a pedestrian collision detection sensor, and FIG.
In FIG. 9, reference numeral 128a denotes a hinge for attaching the lids 126a and 126b, and 129a denotes a lid 12 once opened.
This is a leaf spring that restricts the rotation of 6a and 126b in the closing direction.

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

Therefore, the pedestrian hit by the hood 124 is protected by the hood airbags 125a and 125b.
The impact of the collision with the hood 124 is absorbed, and the fall prevention portions rising on both sides of the hood 124 prevent the hood 124 from falling on the road surface from both left and right sides of the vehicle body.

FIGS. 20 and 21 show a seventh embodiment of the present invention. A housing recess 134a for housing a hood airbag 135 is formed near the front end of a hood 134 of a vehicle body 131. These two storage recesses 134
a, 134a are axes 138 in a direction orthogonal to the vehicle body center line.
a and two lids 1 rotating about 138b respectively
36a and 136b are closed so as to open in double doors. The food airbag 135 is folded and stored in the storage recess 134a, and an inflator 137 is attached to the bottom thereof. The gas generated by the inflator 137 inflates the food airbag 135. The lids 136a and 136b are pushed open in a double-opening manner to bulge outward and expand on the hood 134.

The inside of the hood airbag 135 is
An airbag main body 135b that is deployed on the hood 134 toward the rear of the vehicle body by the sheet-shaped partition wall member 135a;
It is divided into an airbag front portion 135c that is deployed forward of the vehicle body from the storage recess 134a. The partition member 135a is connected to a pressure-sensitive valve that opens when the internal pressure of the airbag becomes a predetermined pressure or higher, or is always in communication therewith. Pore 135d
Is provided. In addition, the airbag front portion 135c
The part which comes into contact with the lid 136a on the front side of the vehicle body when it is inflated is bonded to the lid 136a in advance. In addition,
In FIG. 20, reference numeral 132 denotes a front bumper, and 133 denotes a pedestrian collision detection sensor.

Next, the operation of this embodiment configured as described above will be described. When a collision with a pedestrian is detected by the pedestrian collision detection sensor 133 while the vehicle is traveling, the inflator 137 is ignited, and the hood airbag 135 is inflated by generated gas. At this time, the inside of the hood airbag 135 is formed by a sheet-shaped partition wall member 135a, and an airbag front portion 135c on the vehicle front side with respect to the storage recess 134a and an airbag body 135 behind the airbag front portion 135c.
b. Therefore, the airbag body 1
The gas supplied to the side 35b is not supplied to the front part 135c of the airbag unless it passes through a pressure-sensitive valve or a small hole 135d provided in the partition wall 135a. Then, first, the airbag body 135b is inflated and deployed, and the impact when the pedestrian collides with the hood 134 is absorbed by the airbag body 135b. The airbag front portion 135c of the hood airbag 135 is moved for a predetermined time (for example, from the start of deployment of the airbag body 135b).
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, so that the gas passes through the pressure-sensitive valve which is 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 two-dot chain line in FIG. 21, that is, the position where the lid 136a is inclined backward. When the lid 136a is pushed forward by the airbag front portion 135c that inflates with a delay, the airbag front portion 135c functions as a fall prevention portion, and the hood 134
When the 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 front portion 135c of the airbag, and is prevented from falling onto the road surface.

Therefore, in this embodiment, since the front portion 135c of the airbag is bonded to the lid 136a, the pressure of the airbag body 135b inflates and deploys, and the front lid 136a together with the rear lid 136b.
When the door 136a is pushed open, the front lid 136a is prevented from inclining forward, and the pedestrian can move the lid 136a.
There is no problem even if you touch it.

Also, when the pedestrian is buffered by the airbag body 135b deployed on the hood 134, the internal pressure rises, so that the gas passage to the airbag front part 135c is opened and gas is supplied. As the 135c expands later, the lid 136a is pushed outward, and the front part 135c of the airbag rises to form a fall prevention portion.

[0056]

As described above, when the pedestrian collision detecting means detects a collision with a pedestrian, the fall prevention airbag device of the present invention is provided at the respective positions of the peripheral portion of the hood and the roof and the pillar portion. An airbag that expands and deploys like a wall prevents pedestrians who collided with the hood, roof, or windshield from falling off the hood or roof onto the road surface with the airbag that expands like a wall Therefore, the pedestrian can be protected from collision with the road surface or contact with a following vehicle after the vehicle falls.

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 on the pedestrian who has collided with the hood or the roof on the roof can be reduced, and the peripheral edge can be reduced. The pedestrian's falling on the road surface is prevented by the wall-like portion of the part, and the pedestrian can be protected from collision with the road surface or contact with the following vehicle after the falling.

Further, the volume of the first airbag 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.
In order to deploy the second airbag disposed on at least one of the upper surface and the peripheral portion of the airbag with a predetermined time delay, the first airbag generated by simultaneous deployment of the second airbags in an unintended direction can be used. Misdeployment can be prevented. Therefore, the impact on the pedestrian who has made a secondary collision on the hood or on the roof is absorbed by the first airbag. Furthermore, the second airbag that is deployed on the upper surface or the peripheral portion with a delay of a predetermined time can prevent a pedestrian from falling onto the road surface.

Further, when the lid for closing the airbag housing formed at the peripheral edge of the hood is opened by the pressure of the inflating airbag, the lid rises up the peripheral edge of the airbag and falls down. Since the prevention part was formed,
The impact on the pedestrian who has collided on the hood or on the roof is alleviated, and the fall prevention unit formed on the peripheral edge of the airbag prevents the pedestrian from falling onto the road surface. A pedestrian can be protected from contact with a following vehicle after a fall or the like.

[Brief description of the 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 a 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 the operation of the fall prevention airbag device of the third embodiment.

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

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

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

FIG. 15 is a diagram corresponding to FIG. 14, showing another example of the fall prevention airbag device of 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. 17;

FIG. 19 is an enlarged view of a main part of FIG. 18.

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 sectional side view of a main part showing a state where a lid of a seventh embodiment is opened.

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

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 inflator 12 front bumper 13 pedestrian collision detection sensor 14 hood 15 hood front airbag 16 hood side airbag 17 front pillar 18 front glass side airbag 19 roof section 20 roof front airbag 21 roofside airbag 26 integrated airbag 35 food airbag 35a continuous wall 40 roof airbag 40a continuous wall 50 food airbag 50a continuous wall 60 food airbag 70 foodside airbag 85 first airbag 86 second airbag

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroki Ohara 2-chome, Asahi-cho, Kariya-shi, Aichi Aisin Seiki Co., Ltd. (72) Inventor Naoji Sakakibara 2-chome, Asahi-cho, Kariya-shi, Aichi Aisin Inside Seiki Co., Ltd. (56) Reference Jikken 47-28628 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) B60R 21/34

Claims (4)

(57) [Claims] 1. A pedestrian collision detecting means for detecting a collision with a pedestrian, and air which is installed at a peripheral portion of a hood and a roof of a vehicle body and at a front pillar portion, and is inflated and deployed outward in a wall shape at each position. A fall prevention airbag device comprising: a bag; and an inflator that generates gas when the pedestrian collision detection unit detects a collision with a pedestrian to inflate and deploy the airbag. 2. A pedestrian collision detecting means for detecting a collision with a pedestrian, an airbag inflated and deployed on a hood and a roof of a vehicle body and having a wall at a peripheral edge thereof, and said pedestrian collision detecting means. A fall prevention airbag device, comprising: an inflator that generates gas upon detecting a collision with a pedestrian to inflate and deploy the airbag, respectively. 3. A pedestrian collision detecting means for detecting a collision with a pedestrian, and a first airbag inflated and deployed at least on a hood of a vehicle body when the pedestrian collision detecting means detects a collision with a pedestrian. A second airbag which inflates and deploys in a wall shape on at least one of an upper surface and a peripheral portion of the first airbag after a lapse of a predetermined time from the start of deployment of the first airbag. Fall prevention airbag device. 4. A pedestrian collision detecting means for detecting a collision with a pedestrian, and an airbag which is opened in a peripheral portion of a hood of the vehicle body and which is stored in a storage portion which is openably closed by a lid. And an inflator that generates gas when the pedestrian collision detection unit detects a collision with a pedestrian to inflate and deploy the airbag on a hood. And a lid holding means for holding the lid so as to form a fall prevention portion by raising a peripheral portion of the bag.