阅读说明：本技术 侧气囊装置 (Side airbag device ) 是由 木野雅夫 于 2021-03-05 设计创作，主要内容包括：提供一种侧气囊装置,其能够抑制在气囊开始展开以及膨胀之后乘员臂部的抬起变慢。侧气囊装置通过向气囊(3)供给来自充气机(4)的气体,从而使气囊(3)在就座于车辆的座椅的乘员(P1)与车辆的车身侧部之间从车辆的后方向前方展开以及膨胀。在气囊(3)内部的车辆前后方向上的后部,设置有所述充气机(4)以及内囊(16),该充气机与乘员(P1)的肩中心(SC)相比位于下方、且在上端部具有气体的喷出部(20),该内囊(16)以将该充气机(4)的上端部的周围包围的方式设置。内囊(16)成为固定于气囊(3)内部的状态,该内囊(16)具有下开口部(17)、且在与下开口部(17)相比靠上侧处具有开口面积小于该下开口部(17)的上开口部(18)。(Provided is a side airbag device which can suppress the slow lifting of the arm of the occupant after the airbag starts to be deployed and inflated. The side airbag device deploys and inflates an airbag (3) from the rear to the front of a vehicle between an occupant (P1) seated in a seat of the vehicle and a vehicle body side portion of the vehicle by supplying gas from an inflator (4) to the airbag (3). The inflator (4) is provided at the rear portion in the vehicle longitudinal direction inside the airbag (3), the inflator being located below the Shoulder Center (SC) of the occupant (P1) and having a gas discharge portion (20) at the upper end portion, and an inner bag (16) provided so as to surround the periphery of the upper end portion of the inflator (4). The inner bag (16) is fixed inside the airbag (3), and the inner bag (16) has a lower opening (17) and an upper opening (18) having an opening area smaller than the lower opening (17) on the upper side of the lower opening (17).)

1. A side airbag device that deploys and inflates an airbag from the rear to the front of a vehicle between an occupant seated in a seat of the vehicle and a vehicle body side portion of the vehicle by supplying gas from an inflator to the folded and housed airbag,

the inflator and an inner bag are provided at a rear portion in the vehicle longitudinal direction in the airbag in an expanded and inflated state, the inflator being located below a shoulder center of the occupant and having a gas discharge portion at an upper end portion, the inner bag being provided so as to surround a periphery of the upper end portion of the inflator,

the inner bag is fixed inside the airbag, and has a lower opening portion and an upper opening portion having an opening area smaller than the lower opening portion on an upper side of the lower opening portion.

2. The side airbag apparatus according to claim 1,

a tether that restricts expansion of the airbag in the vehicle width direction is provided at a vertically central portion of the airbag interior during deployment and inflation and on a front side of the inflator.

3. The side airbag apparatus according to claim 2,

the tether is formed to extend in the vertical direction in a state where the airbag is deployed and inflated.

4. The side airbag apparatus according to claim 3,

the tether is inclined with respect to the vertical direction so as to be positioned further toward the front side of the vehicle as it goes toward the upper end.

5. The side airbag apparatus according to claim 3 or 4,

the lower end of the tether is located at a position offset toward the front of the vehicle with respect to the extension line of the lower opening portion of the inner bag.

Technical Field

The present invention relates to a side airbag device.

Background

A side airbag device mounted in a vehicle such as an automobile includes an airbag that is housed in a folded state. This device supplies gas from an inflator to the airbag at the time of a side collision or the like of a vehicle, thereby deploying and inflating the airbag from the rear to the front of the vehicle between an occupant seated in a seat of the vehicle and a vehicle body side portion of the vehicle. The airbag thus deployed and inflated protects the occupant during a side collision of the vehicle.

In the side airbag device of patent document 1, the inside of the airbag in the deployed and inflated state is partitioned by a tether (tether) or the like so as to become a first chamber, a second chamber, and a third chamber from top to bottom, and the gas from the inflator is supplied in the order of the first chamber, the second chamber, and the third chamber. That is, a passage or the like is formed in the airbag so that the gas from the inflator is supplied to the airbag through the passage.

Although the shoulder portion is the closest distance between the occupant and the vehicle body side portion, in the above-described side airbag device, the first chamber is located at a position corresponding to the shoulder portion of the occupant at the time of deployment and inflation of the airbag, so that the first chamber can be rapidly inflated between the shoulder portion of the occupant and the vehicle body side portion. After the first chamber is inflated, the second chamber is inflated, and the arm of the occupant is raised by the second chamber. Thus, the airbag that is deployed and inflated between the occupant and the vehicle body side portion does not press the chest of the occupant via the arm portion of the occupant.

Patent document 1: japanese patent laid-open No. 2014-88073

However, in the side airbag device of patent document 1, at the time of deployment and inflation of the airbag, since the gas from the inflator is supplied to the first chamber and then to the second chamber of the airbag, a certain amount of time is required from the start of deployment and inflation of the airbag until the second chamber inflates. Therefore, the rising of the arm of the occupant is delayed by the inflated second chamber, and along with this, the airbag that is deployed and inflated between the occupant and the vehicle body side portion may press the chest of the occupant via the arm of the occupant.

Disclosure of Invention

The invention aims to provide a side airbag device which can prevent the situation that the lifting of the arm part of an occupant is slow after the airbag starts to be unfolded and expanded.

In the side airbag device for solving the above-described problem, the airbag is deployed and inflated from the rear to the front of the vehicle between the occupant seated in the seat of the vehicle and the vehicle body side portion of the vehicle by supplying gas from the inflator to the folded and housed airbag. The inflator is provided at a rear portion in the vehicle longitudinal direction in the airbag in an expanded and inflated state, the inflator having a gas discharge portion at an upper end portion thereof located below the shoulder center of the occupant, and an inner bag provided so as to surround the periphery of the upper end portion of the inflator. The inner bag is fixed inside the airbag, and has a lower opening portion and an upper opening portion having an opening area smaller than the lower opening portion on an upper side of the lower opening portion.

According to the above configuration, when the airbag is deployed and inflated by the supply of gas from the inflator, the gas from the discharge portion of the upper end portion of the inflator located below the shoulder center of the occupant is discharged into the inner bag. Since the gas flow area of the upper opening portion of the inner bag is smaller than the gas flow area of the lower opening portion, when the gas ejected as described above passes through the upper opening portion, the flow velocity of the gas increases and the gas rapidly reaches the rear upper end inside the airbag and then flows forward at the upper end inside the airbag. Due to such a flow of gas at the upper end inside the airbag, the upper end portion of the airbag rapidly inflates to reach below the arm portion of the occupant, thereby lifting the arm portion, and therefore, the slow lifting can be suppressed.

In the side airbag device, a tether that restricts expansion of the airbag in the vehicle width direction is provided at the center portion in the vertical direction of the inside of the airbag at the time of deployment and inflation and at the front side of the inflator.

Since the vicinity of the waist of an occupant seated in a seat of a vehicle is a relatively hard portion, it is preferable that the airbag be quickly positioned between the waist of the occupant and a vehicle body side portion of the vehicle when the airbag is deployed and inflated. On the other hand, a part of the gas ejected from the ejection portion of the upper end portion of the inflator flows downward inside the airbag through the lower opening portion of the inner bag. According to the above configuration, since the inflation of the portion of the airbag interior in the vertical direction, which is the central portion and the front side of the inflator, in the vehicle width direction is restricted by the tether, the gas discharged from the inflator and flowing downward in the airbag interior is less likely to stay in the vertical direction central portion of the airbag interior. As a result, the gas easily spreads over the lower end of the airbag interior, and the lower end portion of the airbag is inflated relatively quickly and positioned between the waist of the occupant and the vehicle body side portion of the vehicle.

The tether is formed to extend in the vertical direction in a state where the airbag is deployed and inflated.

According to this configuration, by adjusting the length of the tether in the vertical direction, the position and size of the portion that restricts the inflation of the airbag interior in the vehicle width direction can be changed, and the flow pattern of the gas toward the lower end in the airbag interior during the deployment and inflation of the airbag can be adjusted.

Further, it is conceivable that the tether is inclined with respect to the vertical direction so as to be positioned further toward the front side of the vehicle as it goes toward the upper end.

In order to quickly push up the arm of the occupant by the upper end portion of the deployed and inflated airbag, it is preferable to widen the upper end portion of the inside of the airbag to some extent. According to the above configuration, by inclining the tether with respect to the vertical direction in the above manner, the width of the upper end portion inside the airbag can be set to a width that enables the arm portion of the occupant to be promptly pushed up by the upper end portion of the airbag that is deployed and inflated.

It is also conceivable that the lower end of the tether is located at a position offset toward the front of the vehicle with respect to the extension line of the lower opening portion of the inner bag.

According to this configuration, when a part of the gas discharged from the inflator flows downward in the airbag interior through the lower opening portion of the inner bag, the flow of the gas can be suppressed from being obstructed by the lower end of the tether.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, it is possible to suppress the slow lifting of the arm of the occupant after the airbag starts to deploy and inflate.

Drawings

Fig. 1 is a side view showing the entire side airbag device.

Fig. 2 is an enlarged cross-sectional view of the periphery of the airbag in the seat back.

Fig. 3 is a plan view showing a positional relationship between a seat and a vehicle body side portion in the vehicle.

Fig. 4 is a side view showing a state after the airbag is expanded.

Fig. 5 is a side view showing the inner bag in an enlarged manner.

Fig. 6 is a side view showing a state in which a cloth sheet for forming an airbag is expanded.

Detailed Description

Next, an embodiment of a side airbag device applied to a vehicle such as an automobile will be described with reference to fig. 1 to 6.

As shown in fig. 1, the side airbag device includes: an airbag 3 that is housed in a folded state inside a seatback 2 of a seat 1 of a vehicle; and an inflator 4 for supplying inflation gas to the airbag 3. The inflator 4 is fixed to a frame 6 extending along the seat back 2 substantially in the vertical direction inside the seat back 2 together with the airbag 3.

The airbag 3 in fig. 1 is shown by a broken line in a state of being folded and stored in the seat back 2, and is shown by a two-dot chain line in a state of being deployed and inflated by receiving supply of inflation gas from the inflator 4. Incidentally, as shown by the two-dot chain line in fig. 1, the size and the fixed position of the airbag 3 that is deployed and inflated are such that the upper end of the airbag 3 is located at a position corresponding to the shoulder of the occupant P1, while the lower end of the airbag 3 is located at a position corresponding to the waist of the occupant P1.

Fig. 2 is an enlarged view of the periphery of the airbag 3 in the seat back 2. As is apparent from fig. 2, the inflator 4 housed inside the seat back 2 is fixed by caulking or the like to a retainer 5 that covers the periphery of the inflator 4. The retainer 5 is fixed to the frame 6 together with the airbag 3 in the folded state by bolts 7 and nuts 8 (only the upper bolt and the nut are shown in fig. 2) provided at the upper and lower stages. Thereby, the inflator 4 is fixed to the frame 6 of the seat back 2 via the retainer 5, and the airbag 3 is also fixed to the frame 6.

As shown in fig. 1, the side airbag device further includes: a control device 9 that controls supply of inflation gas from the inflator 4 to the airbag 3; and a collision sensor 10 for detecting a side collision of the vehicle. The collision sensor 10 outputs a detection signal to the control device 9 if a collision based on a side collision is applied to the vehicle. The control device 9 operates the inflator 4 based on a detection signal from the collision sensor 10 to supply inflation gas to the airbag 3.

When inflation gas is supplied from the inflator 4 to the folded airbag 3, the airbag 3 deploys and inflates, leaving a portion near the inflator 4 in the seatback 2 and is ejected forward (rightward in fig. 1) from the seatback 2. As shown by the two-dot chain line in fig. 3, the airbag 3 ejected from the seat back 2 deploys and inflates forward (rightward in fig. 3) of the vehicle between an occupant P1 seated in the seat 1 and the vehicle body side portion 11 such as a door and a pillar of the vehicle. In addition, the open arrows in fig. 3 indicate the direction of application of a collision when the collision is applied to the vehicle body side portion 11 due to a side collision of the vehicle.

Next, the airbag 3 will be described in detail.

As shown in fig. 4, the airbag 3 is formed into a bag shape by folding one sheet of cloth 13 in two along a folding line L1 to overlap in the thickness direction, and joining the peripheral edges of the overlapped portion to each other at a position indicated by a thick broken line L2. An opening 14 that communicates the inside and the outside of the airbag 3 is formed in the vertically central portion of the airbag 3 near the fold line L1. The retainer 5 (inflator 4) can be inserted into the airbag 3 through the opening 14. Further, a pair of upper and lower attachment holes 15 are formed in one of the portions of the fabric sheet 13 that are folded into two by the folding line L1 and overlap in the thickness direction, and in the portion located above the opening 14. These mounting holes 15 are used to mount the rear end portion (left end portion in fig. 4) of the airbag 3 to the frame 6 (fig. 2) of the seat back 2.

An inner bag 16 formed in a tubular shape is provided inside the airbag 3 above the opening 14. The inner bag 16 has a lower opening portion 17. The inner bag 16 has an upper opening 18 having an opening area smaller than the lower opening 17 above the lower opening 17. The inner bag 16 is also formed with a pair of upper and lower mounting holes 19 corresponding to the pair of upper and lower mounting holes 15 of the airbag 3. The retainer 5 (inflator 4) is inserted into an inner bag 16 located inside the airbag 3 through an opening 14 of the airbag 3.

When the retainer 5 is fixed to the frame 6 (fig. 2), the bolts 7 of the retainer 5 are inserted through the mounting holes 19 of the inner bag 16 and the mounting holes 15 of the airbag 3. The airbag 3 and the inner bag 16 are fixed to the frame 6 together with the retainer 5 by using the bolt 7 and the nut 8 (fig. 2). At this time, the inner bag 16 is fixed inside the airbag 3. Further, the inner bag 16 may be formed integrally with the airbag 3. Incidentally, the airbag 3 is fixed to the frame 6 in such a manner that the portion of the airbag 3 that is away from the retainer 5 is positioned on the front side of the vehicle (the right side in fig. 4).

In the fixed state in which the retainer 5 is fixed to the frame 6, the inflator 4 fixed to the retainer 5 is positioned below the shoulder center SC of the occupant P1 seated in the seat 1. An ejection portion 20 for ejecting inflation gas is provided at an upper end portion of the inflator 4. The ejection portion 20 ejects the inflation gas to the outside of the ejection portion 20, i.e., in the direction indicated by the solid arrow in fig. 4. The periphery of the upper end portion (discharge portion 20) of the inflator 4 is surrounded by the inner bag 16 located inside the airbag 3. Then, if inflation gas is ejected into the inner bag 16 from the ejection portion 20 of the inflator 4 as indicated by the solid line arrow in fig. 4, the inflation gas flows toward the upper end of the inside of the airbag 3 through the upper opening portion 18 of the inner bag 16, while a part of the inflation gas flows downward of the inside of the airbag 3 through the lower opening portion 17 of the inner bag 16.

Fig. 5 shows the retainer 5 (inflator 4) and the inner bag 16 in an enlarged manner.

As seen from fig. 5, inner bag 16 is formed in a tubular shape by folding sheet 21 in two along fold line L1 to overlap in the thickness direction, and joining the overlapped portions to each other at positions indicated by thick broken lines L6 and L7. Incidentally, the thick broken line L6 extends in the up-down direction of fig. 5 at a position near the folding line L1. On the other hand, the thick dashed line L7 extends in the vertical direction at a position separated from the thick dashed line L6 in the right direction in fig. 5, and is inclined with respect to the thick dashed line L6 such that the distance between the portion on the upper side in fig. 5 and the thick dashed line L6 in the left-right direction in fig. 5 becomes shorter.

In the inner bag 16, a portion between a lower end portion of a thick dashed line L7 and a thick dashed line L6 serves as the lower opening portion 17, and a portion between an upper end portion of a thick dashed line L7 and a thick dashed line L6 serves as the upper opening portion 18. When the bolt 7 of the retainer 5 is inserted into the mounting hole 19 of the inner bag 16, the discharge portion 20 located at the upper end of the inflator 4 fixed to the retainer 5 is surrounded by a portion between the thick dashed line L6 and the thick dashed line L7 inside the inner bag 16. Due to the oblique relationship of thick broken line L7 with respect to thick broken line L6 in the above-described manner, the opening area of upper opening portion 18 of inner bag 16 becomes smaller than the opening area of lower opening portion 17.

Fig. 6 shows the inside of the two-folded cloth 13 of the airbag 3 about the folding line L1, and more specifically shows the cloth 13 in an opened state before the two-folded cloth 13 is folded about the folding line L1 so that the inside is exposed.

As is apparent from fig. 6, the reinforcing fabric sheet 22 smaller than the fabric sheet 13 is fixed to the center of the fabric sheet 13 by sewing or the like. The airbag 3 has the opening 14 for inserting the retainer 5 (inflator 4) and the inner bag 16 into the airbag 3 at a portion corresponding to the fold line L1 of the panels 13 and 22. The attachment hole 15 for attaching the retainer 5, the inner bag 16, and the airbag 3 to the frame 6 of the seat 1 is formed in the upper side of the opening 14 of the panels 13 and 22 in fig. 6.

The fastening bands 23 are provided on both ends of the cloth 22 in the left-right direction in fig. 6. The above-mentioned portions of the tether 23 adjacent to the folding line L1 are joined to the cloth pieces 13, 22 at positions indicated by thick broken lines L4, and the tethers 23 are joined to each other at portions separated from the folding line L1, i.e., at positions indicated by thick broken lines L5. As shown in fig. 4, the tether belts 23 joined to each other at the thick broken line L5 are in a state of being stretched in the vehicle width direction (direction orthogonal to the paper surface of fig. 4) at the time of deployment and inflation of the airbag 3, and restrict inflation of the airbag 3 in the vehicle width direction.

The portions of the tether 23 corresponding to the thick dashed lines L5 at this time extend in the vertical direction at the center in the vertical direction in the airbag 3 during deployment and inflation and on the front side (the right side in fig. 4) of the inflator 4, and are inclined with respect to the vertical direction so as to be positioned further toward the front side of the vehicle toward the upper end. That is, the coupling portion of the laces 23 to each other (thick dotted line L5) is determined in this manner. At this time, the lower ends of the portions of the tether 23 corresponding to the thick broken line L5 are located at positions shifted toward the front side of the vehicle with respect to the extension line L8 of the lower opening portion 17 of the inner bag 16.

Next, the operation of the side airbag device in the present embodiment will be described. When a collision due to a side collision is applied to the vehicle, an inflation gas is supplied from the ejection portion 20 of the inflator 4 shown in fig. 4 into the airbag 3 housed in a folded state inside the seatback 2 (fig. 2) of the seat 1 of the vehicle. As a result, as shown in fig. 3, the airbag 3 is deployed and inflated toward the front of the vehicle (rightward in fig. 3) between the occupant P1 seated in the seat 1 and the vehicle body side portion 11 such as a door and a pillar of the vehicle.

As shown in fig. 4, the discharge portion 20 of the inflator 4 is located below the shoulder center SC (fig. 4) of the occupant P1. Then, at the time of deployment and inflation of the airbag 3, inflation gas from the ejection portion 20 is ejected into the inner bag 16. As shown by solid arrows in fig. 4, the inflation gas ejected from the ejection portion 20 flows toward the upper end of the interior of the airbag 3 through the upper opening portion 18 of the inner bag 16. On the other hand, a part of the inflation gas flows downward into the airbag 3 through the lower opening 17 of the inner bag 16.

The gas flow area of the upper opening 18 of the inner bag 16 is smaller than the gas flow area of the lower opening 17. Therefore, when the inflation gas ejected from the ejection portion 20 passes through the upper opening portion 18, the flow velocity of the inflation gas increases, and the inflation gas quickly reaches the rear upper end (left upper end in fig. 4) inside the airbag 3, and then flows forward (right in fig. 4) at the upper end inside the airbag 3. Such a flow of the inflation gas at the upper end inside the airbag 3 causes the upper end portion of the airbag 3 to rapidly inflate and reach below the arm portion (the two-dot chain line in fig. 4) of the occupant P1, and the arm portion is lifted up as indicated by the solid line in fig. 4, so that the slow lifting up can be suppressed.

According to the present embodiment described in detail above, the following effects can be obtained.

(1) It is possible to suppress the slow raising of the arm of the occupant P1 after the airbag 3 starts to deploy and inflate.

(2) Inside the airbag 3, a part of the inflation gas ejected from the ejection portion 20 of the inflator 4 flows downward inside the airbag 3 through the lower opening portion 17 of the inner bag 16. A tether 23 that restricts the expansion of the airbag 3 in the vehicle width direction is provided at the center portion in the vertical direction of the interior of the airbag 3 during deployment and inflation, and at the front side of the inflator 4.

Here, since the vicinity of the waist of the occupant P1 seated in the seat 1 of the vehicle is a relatively hard portion, it is preferable that the airbag 3 be promptly positioned between the waist of the occupant P1 and the vehicle body side portion 11 of the vehicle when the airbag 3 is deployed and inflated. In this regard, in the side airbag device, the expansion of the central portion in the vertical direction in the airbag 3 and the portion on the front side of the inflator 4 in the vehicle width direction is restricted by the tether 23. Thus, the gas discharged from the discharge portion 20 of the inflator 4 and flowing downward inside the airbag 3 is less likely to stay in the vertically central portion thereof. As a result, the inflation gas easily spreads over the lower end of the interior of the airbag 3, and the lower end of the airbag 3 can be inflated relatively quickly and positioned between the waist portion of the occupant P1 and the vehicle body side portion 11 of the vehicle.

(3) The portions of the tether 23 coupled to each other at the positions indicated by the thick dashed lines L5, which correspond to the thick dashed lines L5, are formed so as to extend in the vertical direction in the state where the airbag 3 is deployed and inflated. Therefore, by adjusting the length of the tether 23 in the vertical direction, the position and size of the portion of the airbag 3 that restricts inflation in the vehicle width direction can be changed, and the flow pattern of the gas toward the lower end inside the airbag 3 during deployment and inflation of the airbag 3 can be adjusted.

(4) In order to quickly raise the arm of the occupant by the upper end portion of the deployed and inflated airbag 3, the upper end portion inside the airbag 3 is preferably widened to some extent. Therefore, the portions of the tether 23 inside the airbag 3 corresponding to the thick dashed line L5 are inclined with respect to the vertical direction so as to be positioned further toward the front side of the vehicle toward the upper end. This makes it possible to make the width of the upper end portion inside the airbag 3 the width of the arm portion capable of quickly raising the occupant P1 by the upper end portion of the airbag 3 being deployed and inflated.

(5) The lower end portions of the tether 23 in the airbag 3 corresponding to the thick broken line L5 are located at positions shifted toward the front side of the vehicle with respect to the extension line L8 of the lower opening portion 17 of the inner bag 16. Therefore, when a part of the inflation gas discharged from the discharge portion 20 of the inflator 4 flows downward inside the airbag 3 through the lower opening portion 17 of the inner bag 16, the flow of the inflation gas can be suppressed from being obstructed by the lower end portions of the tether 23 corresponding to the thick broken line L5.

The above embodiment can be modified as follows, for example. The above-described embodiment and the following modifications can be combined with each other within a range not technically contradictory.

The lower end portions of the tether 23 corresponding to the thick dashed lines L5 need not be positioned at positions shifted toward the front side of the vehicle with respect to the extension line L8 of the lower opening portion 17 of the inner bag 16 at the time of deployment and inflation of the airbag 3.

The portions of the tether 23 corresponding to the thick dashed line L5 do not necessarily need to be inclined with respect to the vertical direction so as to be positioned further toward the front side of the vehicle as the upper end is moved toward the upper end during deployment and inflation of the airbag 3.

The portions of the straps 23 corresponding to the thick dashed lines L5 need not necessarily be formed so as to extend in the vertical direction.

The tether 23 may be omitted.

The portions of the fabric sheet 21 forming the inner bag 16 that are folded into two along the folding line L1 and overlapped in the thickness direction are joined to each other at the positions indicated by thick dashed lines L6 and L7, and the thick dashed lines L6 and L7 do not necessarily have to extend linearly in this case.

Description of the reference numerals

1 … seat, 2 … seat back, 3 … air bag, 4 … inflator, 5 … retainer, 6 … frame, 7 … bolt, 8 … nut, 9 … control device, 10 … crash sensor, 11 … vehicle body side, 13 … cloth piece, 14 … opening part, 15 … mounting hole, 16 … inner bag, 17 … lower opening part, 18 … upper opening part, 19 … mounting hole, 20 … ejection part, 21 … cloth piece, 22 … cloth piece, 23 … lacing.