JP2007230395A - Airbag and airbag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an airbag improved in occupant restraint performance, in regard to an airbag to be inflated for expansion toward a position near the head of an occupant. <P>SOLUTION: The airbag 11 to be inflated for expansion toward a position near the head 2A of the occupant 2 has a first bag 35, to which the pressure fluid is supplied from an inflater 13 first, and a second bag 36, to which the pressure fluid is supplied through the first bag 35. The first bag 35 is provided with shoulder presser parts 38A and 38A for pressing shoulder parts from over by expanding to positions over the shoulder parts on both sides of the head 2A of the occupant. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an airbag and an airbag apparatus that are installed in a vehicle such as an automobile.

  Conventionally, for example, in a driver's seat, a driver's seat airbag device that is inflated and deployed from the center of rotation of the steering wheel to the driver side, a passenger seat airbag that is inflated and deployed from the instrument panel to the passenger seat side, etc. Various airbag devices for restraining the occupant's body are used.

  In recent years, in the event of a major accident in which a large external force is applied to the vehicle, such as a vehicle body rollover due to a collision or a fall of a heavy object such as a fallen tree, there is a possibility that an impact may be applied from the overhead of the occupant to the head. Therefore, an air bag for coping with such a case has already been proposed (see, for example, Patent Document 1).

JP 2002-37011 A

  In the above prior art, an airbag composed of a bag body combined with a base fabric is accommodated in a backrest (or headrest) of a vehicle seat, and inflated by supplying pressure fluid from an inflator to the airbag in an emergency. And a basic configuration for deploying above the head of the passenger is disclosed.

  An object of the present invention is to provide an airbag capable of improving occupant restraint in an airbag that is inflated and deployed near the head of the occupant.

  To achieve the above object, according to a first aspect of the present invention, there is provided an airbag that inflates and deploys in the vicinity of the head of an occupant, and inflates and deploys above a side shoulder of the head to hold the shoulder from above. It comprises a part.

  In the first invention of this application, when the airbag is inflated and deployed at the time of a vehicle collision (including a side collision) or rollover, the shoulder of the occupant is pressed from above. Thereby, movement (especially movement of an up-down direction) of a passenger | crew's body can be controlled and the collision etc. in a vehicle can be suppressed. For example, in the case of an airbag that does not have a shoulder pressing portion and is simply inflated and deployed above the head of the occupant, a body load may be applied to the head (or neck) that is restrained when the vehicle rolls over. According to the first invention of the present application, the shoulder of the occupant is held by the shoulder pressing portion and the occupant's body is restrained to the seat, so that the load on the occupant's head (or neck) can be reduced due to the above situation. . As described above, according to the airbag of the first invention of the present application, occupant restraint can be improved.

  A second invention is characterized in that, in the first invention, a pulling means for pulling the inflated and deployed shoulder pressing portion downward is connected to a lower front portion of the shoulder pressing portion.

  In the second invention of the present application, when the airbag is inflated and deployed at the time of a vehicle collision (including a side collision) or rollover, the shoulder pressing portion is pulled downward by the pulling means, and The shoulder part is pressed from above to restrict the movement of the occupant's body (especially movement in the vertical direction). Thereby, the pressing force by the shoulder pressing portion can be increased to further restrict the movement of the occupant's body (particularly the movement in the vertical direction). Therefore, occupant restraint can be further improved.

  According to a third invention, in the first invention described above, a front shoulder pressing portion for pressing the shoulder portion from the front is formed in a lower front portion of the shoulder pressing portion.

  In the third invention of the present application, when the airbag is inflated and deployed at the time of a vehicle collision (including a side collision) or rollover, the shoulder pressing portion holds the shoulder portion of the occupant from above, and the shoulder pressing portion The shoulder portion of the occupant is pressed from the front by the formed front shoulder pressing portion. Thereby, not only the movement of the occupant's body in the vertical direction but also the movement in the front-rear direction can be restricted, and a collision into the vehicle can be further suppressed. Therefore, occupant restraint can be further improved.

  According to a fourth aspect of the invention, in any one of the first to third aspects of the invention, an upper development part that expands and develops above the head is provided.

  Thereby, the upward movement of the occupant's head can be restricted at the time of a vehicle collision (including a side collision) or rollover, and the load on the occupant's head can be reduced.

  According to a fifth aspect of the present invention, in any one of the first to third aspects, a non-expanding shielding means that expands above the head is provided.

  Accordingly, the airbag can be downsized while maintaining the restraining function of restraining the occupant's shoulder, and the inflator can also be downsized because less pressure fluid is required.

  In order to achieve the above object, a sixth invention includes the airbag according to any one of the first to fifth inventions, and an inflator for supplying pressure fluid for inflating and deploying the airbag. It is characterized by that.

  According to the present invention, occupant restraint can be improved.

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

  First, a first embodiment of an airbag apparatus according to the present invention will be described with reference to FIGS.

  1A and 1B are schematic side views of a vehicle seat provided with the airbag apparatus according to the first embodiment of the present invention. FIG. 1A shows a normal state and FIG. 1B shows an airbag inflated. ing. In FIG. 1, an occupant 2 is seated on a seat 1. The seat 1 has a seat portion 1A, and a backrest portion 1B protrudes upward from the seat portion 1A. A headrest 1C is attached to the top of the backrest 1B.

  The seat 1 is equipped with an airbag device 10 in the backrest 1B for restraining the head 2A of the occupant 2 when the vehicle rolls over due to an accident. The airbag device 10 includes a first bag 35 (see FIG. 5) in which the first base fabric 35A and the second base fabric 35B are sewn and joined, and a second bag in which the third base fabric 36A and the fourth base fabric 36B are sewn together. A bag 36 (see FIG. 6) and a flow path coupling member 60 (see FIGS. 4, 7, and 8) for coupling the first bag 35 and the second bag 36, and the head of the occupant 2 when inflated. An airbag 11 provided so as to be deployed in the vicinity of the portion 2A, a retainer 12 accommodated in a state in which the airbag 11 is folded, and a gas (pressure fluid) for inflating and deploying the airbag 11 are supplied. And an inflator 13 (see FIGS. 2 and 3). Further, the seat 1 includes a seat frame 14 that includes a side plate 14A (see FIG. 2), a cross member 14B (see FIG. 2), and the like and forms a skeleton of the seat 1, and the retainer 12 and the inflator. 13 is provided on the seat frame 14 (details will be described later).

  In addition, although not shown in the figure, in the automobile on which the airbag device 10 is mounted, when the automobile collides (including a side collision or the like) or rolls over, the occurrence (or prediction of the occurrence) is detected. Various sensors are provided. Then, an inflator control circuit (not shown) activates an initiator (not shown) of the inflator 13 based on detection signals from these sensors.

  As shown in FIG. 1A, the airbag 11 is stored in a folded state in the retainer 12 at normal times. On the other hand, for example, when the automobile collides or rolls over, the sensor detects this, and an activation signal is input from the inflator control circuit to the initiator of the inflator 13 to activate the initiator, and FIG. As shown, the airbag 11 is inflated and deployed near the head 2 </ b> A of the occupant 2. At this time, the airbag 11 causes the head 2 </ b> A of the occupant 2 to be inflated and deployed by the pressing portion of the first bag 35 (see FIGS. 4 and 5) and the lower portion of the second bag 36 (see FIGS. 4 and 6). It expand | swells so that it may push forward, can bend the head 2A of the passenger | crew 2, and can reduce the burden to a neck part.

  FIG. 2 is a perspective view showing a structure for fixing the airbag device 10 to the seat frame 14, and FIG. 3 is an exploded perspective view of the airbag device 10 showing the fixing structure in more detail.

  2 and 3, the seat frame 14 includes a pair of side plates 14A and 14A provided on both sides in the vehicle width direction (both sides in the left-right direction in FIG. 2) in the back portion 1B of the seat 1, and these side plates. A cross member 14B is provided between 14A and 14A so as to extend substantially along the vehicle width direction and to connect the side plates 14A and 14A. The side plates 14A and 14A and the cross member 14B are both provided in the backrest portion 1B of the seat 1. Although not particularly illustrated, the seat frame 14 also has a base plate provided in the seat portion 1A.

  A gas supply port 35a connected to the inflator 13 and the pipe member 20 on the base end side (the inflator side, the lower side in FIG. 3) of the airbag 11, and mounting pieces located on both sides of the gas supply port 35a 35b and 35b are provided. Two bolt holes 22 through which mounting bolts 21a for fixing the airbag 11 and the retainer 12 are inserted are formed in the mounting pieces 35b and 35b. On the other hand, the retainer 12 is provided with attachment portions 12a and 12b in which bolt holes 24 through which attachment bolts 23 for fixing the retainer 12 are inserted are provided on both sides in the vehicle width direction. The lower side in FIG. 3 is provided with a mounting portion 12c having a bolt hole 25 similarly formed at a position corresponding to the bolt hole 22 of the airbag mounting portion 11b.

  A plurality (four in this embodiment) of the mounting bolts 21a are formed on the bolt holes 25 formed in the retainer mounting portion 12c and the airbag mounting portion 11b in a state where the airbag 11 is folded and stored in the retainer 12. The bolt hole 22 and the mounting plate 26 are respectively inserted into bolt holes 27 formed at positions corresponding to the bolt holes 22 of the airbag mounting portion 11b, and fastened to the nut 21b. Thereby, the airbag 11 is fixed to the retainer 12 in the folded state. A plurality (two in this embodiment) of the mounting bolts 23 are inserted into the bolt holes 24 of the retainer mounting portions 12a and 12b, and then fastened to fastening holes (not shown) provided in the cross member 14B. Thereby, the retainer 12 accommodated in the state in which the airbag 11 is folded is fixed to the cross member 14B.

  The pipe member 20 is, for example, a metal pipe bent at a plurality of locations (two locations in the present embodiment), and is provided below the retainer 12. The pipe member 20 and the airbag 11 are connected to each other by covering the bag side end 20a of the pipe member 20 with the gas supply port 35a of the airbag 11 and caulking and fixing it with a metal clamp band 30, for example. Yes. In addition, the pipe member 20 and the inflator 13 are connected by connecting and bonding (or welding or the like) the connecting portion 20b provided at the end portion on the inflator side of the pipe member 20 to the upper end portion 13a of the inflator 13. Yes. In this way, the airbag 11 and the inflator 13 are connected via the pipe member 20.

  The inflator 13 is provided further below the pipe member 20, and is attached to the side plate 14 </ b> A on one side (the right side in the vehicle width direction in the present embodiment) by an attachment member 31. The mounting member 31 includes a pair of mounting plates 31A and 31B that sandwich and support the inflator 13, and these mounting plates 31A and 31B are a plurality (four in this embodiment) formed on the mounting plate 31A. The rivet 31a is inserted and inserted into a plurality of (four in this embodiment) rivet holes 31b drilled at corresponding positions on the mounting plate 31B, and is fixed with the inflator 13 therebetween. An attachment portion 31c formed by bending approximately 90 degrees is provided at one end (right side in the vehicle width direction) of the attachment plate 31A, and a plurality of (two in this embodiment) attachment bolts 32 are provided. The attachment member 31 is fixed to the side plate 14A by being inserted into a bolt hole 33 formed in the attachment portion 31c and fastened to a fastening hole (not shown) provided in the side plate 14A. Yes. As a result, the inflator 13 is fixed to the side plate 14 </ b> A via the attachment member 31.

  The inflator 13 and the above-described control unit (not shown) are connected by a cable 34, and ignition control of the inflator 13 is performed via the cable 34.

  FIG. 4 is a perspective view showing the entire structure of the airbag 11 in a completely inflated and deployed state.

  In FIG. 4, the airbag 11 has a pressing deployment portion 37 and a shoulder pressing portion 38 </ b> A including a supporting deployment portion 38, and first the pressurized fluid is supplied from the inflator 13 to move the pressing deployment portion 37 to the back of the occupant. The first bag 35 that bends the occupant's head by inflating and deploying on the side facing the occupant and holding the occupant's shoulder from above by inflating and deploying above the side shoulder of the occupant's head 2A. And an upper deploying portion 39 and a lower deploying portion 50. The pressurized fluid is supplied through the first bag 35 so that the upper deploying portion 39 is inflated and deployed above the head of the occupant and deployed downward. A second bag 36 inflating and deploying the portion 50 on the opposite side of the occupant with the pressing and deploying portion 37, and a flow path coupling member 60 that couples the interior of the first bag 35 and the second bag 36 so that they can communicate with each other. HaveTwo lead-out flow paths 35t formed of tubular flow paths in the first bag 35 and two introduction flow paths 36i formed of tubular flow paths in the second bag 36 are highly sealed by the flow path coupling member 60. It is combined with sex.

  The gas supply port 35a described above is provided in the lower portion of the first bag 35, and the gas ejected from the inflator 13 passes through the pipe member 20 and the gas supply port 35a, and the pressure deployment portion 37 in the first bag 35 is provided. , And the support deployment part 38 and the shoulder pressing part 38A. Then, the pressure fluid flows from the two outlet passages 35t located on both sides of the gas supply port 35a at the lower part of the first bag 35 into the two inlet passages 36i located on both sides of the lower part of the second bag 36, respectively. And supplied to the upper development part 39 and the lower development part 50.

  The first bag 35 and the second bag 36 are respectively two independent bags formed by sewing and joining a base fabric on the occupant 2 side (vehicle front side) and a base fabric on the side opposite to the occupant 2 (vehicle rear side). The body 35 and the bag body 36 are configured as the airbag 11 by combining the respective flow paths.

  FIG. 5 is a plan view seen from the second base fabric side showing the overall structure of the first bag 35 before being inflated and deployed (a state before being folded for storage). In addition, since the 1st bag 35 is a substantially left-right symmetric form, description of the left half is abbreviate | omitted.

  As shown in FIG. 5, the first bag 35 is supplied with gas from a first base cloth 35 </ b> A and a second base cloth 35 </ b> B (only the second base cloth 35 </ b> B is shown in FIG. 5) having substantially the same shape. A single bag is formed by sewing and joining over the entire circumference except for the mouth 35a and the outlet channel 35t. In the figure, reference numeral 40 denotes the sewing joint portion, and reference numeral 41 denotes a sealing material portion made of an appropriate sealing material provided along the sewing joint portion 40 for sealing the sewing joint portion 40.

  The second base fabric 35B includes a substantially flat trapezoidal pressing development portion 37 that expands from the gas supply port 35a side (lower side in the drawing) toward the opposite side (upper side in the drawing), It has a pair of shoulder pressing parts 38A including a pair of support deployment parts 38 provided on the left and right sides in the figure. The first base cloth 35A has substantially the same shape as the second base cloth 35B. As described above, the first base fabric 35A and the second base fabric 35B having such a shape are sewn and joined over the entire circumference except for the gas supply port 35a and the two outlet flow passages 35t. Between the cloth 35A and the second base cloth 35B, a pair of shoulder pressing parts 38A including a pressing development part 37 and a pair of support development parts 38 arranged on the left and right sides of the pressing development part 37, and a lead-out flow path 35t is formed. As a result, a pair of shoulder pressing portions 38A including the pressing and unfolding portion 37, the supporting and unfolding portion 38, and the lead-out flow path 35t are enveloped by the sewing joint portion 40 and the sealing material portion 41 as a whole. Are arranged as follows.

  The pressing and unfolding portion 37 includes a sewing joint portion 40a provided substantially along the gas inflow direction at a substantially central portion thereof, and a sewing joint portion 40b provided on both sides (left and right sides in the drawing) of the sewing joint portion 40a. And four pressing expansion chambers 37a (not shown), 37b, 37c, and 37d formed by 40c. Thereby, the gas supplied from the gas supply port 35a can be smoothly introduced toward the downstream side (upper side in the drawing) of the pressing and expanding portion 37.

  The first bag 35 having the above-described configuration is sewn on the outer edge portion along the sewing joint portion 40 in a state where the first base fabric 35A and the second base fabric 35B are overlapped, and the press-deployment portion 37 is sewn. The shoulder pressing portions 38A on both sides including the supporting development portions 38 on both sides are sewn along the coupling portions 40a, 40b (not shown), 40c, etc., and the occupant is in the first bag 35 as shown in FIG. The left and right sides of the head 2A of the second head 2A are sandwiched and folded so that both shoulders are pressed from above, and in order to maintain this state, sewing is performed appropriately on both sides of the upper deployment portion 39 of the second bag 36 (see FIG. 4). At this time, by forming the height from the lower end portion of the shoulder pressing portion 38A to the upper development portion 39 higher than the height from the shoulder portion of the occupant to the apex of the head, the shoulder pressing portion 38A can be It is possible to appropriately distribute the load, for example, by preventing the apex of the head from receiving a strong pressing force from the upper development part 39 when pressing.

  FIG. 6 is a plan view seen from the fourth base fabric 36B side showing the overall structure of the second bag 36 before it is inflated and deployed (before it is folded for storage).

  As shown in FIG. 6, the second bag 36 includes two third and fourth base cloths 36A and 36B (only the fourth base cloth 36B is shown in FIG. 6) having substantially the same shape. By forming a sealing member 41 that is sewn and joined over the entire circumference excluding the introduction flow path 36i, a single bag is formed.

  The fourth base fabric 36B has a substantially rectangular shape extending from the introduction flow path 36i side (lower side in the drawing) toward the opposite side (upper side in the drawing), and is developed upward in the upper side in the drawing. It has the part 39 and the downward expansion | deployment part 50 of the downward direction in the figure. The third base fabric 36A has substantially the same shape as the fourth base fabric 36B. As described above, the third base cloth 36A and the fourth base cloth 36B are sewn and joined over the entire circumference excluding the two introduction flow paths 36i, as described above, whereby the third base cloth 36A and the fourth base cloth 36B. Between the base fabric 36B, an upper developed portion 39 in the upper half in the drawing, a lower developed portion 50 in the lower half in the drawing, and two introduction flow paths 36i are formed. As a result, the upper development part 39, the lower development part 50, and the introduction flow path 36i are arranged so that the outer edge part is enveloped by the sewing joint part 40 and the sealing material part 41 as a whole.

  The upper part of the upper development part 39 and the lower development part 50 is formed by two sewing joint parts 40d and 40e provided so as to be substantially along the gas inflow direction in an arrangement that equally divides the width direction into three parts. It has three upper expansion chambers 39a, 39b and 39c. Thereby, the gas introduced from the introduction flow path 36i can be smoothly introduced toward the downstream side (upper side in the drawing) of the upper development chambers 39a, 39b, 39c.

  The second bag 36 having the above-described configuration is sewn on the outer edge portion along the sewing joint portion 40 in a state where the third base fabric 36A and the fourth base fabric 36B are overlapped, and the sewing joint portions 40d and 40e. Next, the upper developing chambers 39a, 39b, 39c are folded forward with respect to the first bag 35 so as to expand above the head of the occupant 2 as shown in FIG. In order to do this, sewing is carried out as appropriate (see FIG. 4) with the support development portions 38 on both sides of the first bag 35.

  Then, the first bag 35 and the second bag 36 overlap with each other at the press deployment portion 37 and the lower deployment portion 50. Further, in the overlapping portion of the press development part 37 and the lower development part 50, three sewing joint parts 40a, 40b, 40c of the press development part 37 and two sewing joint parts 40d of the lower development part 50, 40e is formed so as to be displaced from each other. As a result, as shown in FIG. 9, the four press deployment chambers 37a, 37b, 37c, and 37d and the upper deployment chambers 39a, 39b, and 39c that are formed on the respective chambers are also inflated and deployed in an arrangement shifted from each other.

  Further, the gas supply port 35a provided at the lower center of the first bag 35 supplies the pressure fluid upward in the figure, while the outlet flow channel 35t has the inflow direction of the pressure fluid from the gas supply port 35a. It is provided at a position separated from the extension line.

  FIG. 7 is an enlarged perspective view partially showing a coupling portion between one lead-out flow path 35t and the introduction flow path 36i in FIG. 4, and FIG. 8 is a cross-sectional view taken along line VIII-VIII ′ in FIG. FIG.

  As shown in FIGS. 7 and 8, the lead-out flow path 35 t of the first bag 35 is inserted into the introduction flow path 36 i of the second bag 36, and the overlapping portion is coupled by the flow path coupling member 60. Has been. The flow path coupling member 60 includes a hollow communication pipe 61 inserted through an overlapping portion of the lead-out flow path 35t and the introduction flow path 36i, and an outer peripheral fastening member attached to be tightened from the outer periphery of the introduction flow path 36i at the same overlapping portion. 62.

  The hollow communication pipe 61 is made of, for example, a relatively hard plastic, and is formed into a circular pipe (pipe) shape whose inner diameter is sufficiently large to allow a pressure fluid to flow smoothly. The outer periphery fastening member 62 is fastened to the hollow communication pipe 61 while securing high sealing performance by fastening the overlapping portion of the outlet flow passage 35t and the introduction flow passage 36i from the outer periphery. For example, a tie wrap or a clamp band is used. be able to.

  Then, the first bag 35 and the second bag 36 combined in this way are combined into one airbag 11, and when this is attached to the retainer 12, it is folded and stored in the retainer 12. At this time, since the hollow communication pipe 61 is made of a hard material, the shape of the hollow communication pipe 61 is not crushed even when the airbag 11 is folded, that is, the flow in the overlapping portion of the outlet channel 35t and the inlet channel 36i. The road cross-sectional shape and the communication state are maintained.

  According to the airbag device 10 of the first embodiment having the configuration described above, the following effects can be obtained.

  That is, in the airbag device 10 of the present embodiment, when the airbag 11 is inflated and deployed, the shoulder pressing portions 38A and 38A are inflated and deployed above the shoulder portions on both sides of the head 2A of the occupant, Press from above. This restricts movement of the occupant head 2A in the lateral direction at the time of a vehicle collision (including a side collision) or rollover, and restricts movement of the occupant 2 body (particularly movement in the vertical direction). It is possible to suppress a collision into the vehicle. Further, for example, in the case of an airbag that does not have the shoulder pressing portion 38A and is simply inflated and deployed above the occupant's head 2A, a body load is applied to the head 2A (or neck) constrained when the vehicle rolls over. However, according to the present embodiment, the body of the occupant 2 is restrained to the seat 1 by pressing both shoulders of the occupant with the shoulder pressing portions 38A, 38A, so that the above situation leads to the occupant's head 2A (or neck). Can be reduced. From the above, occupant restraint can be improved.

  Further, in the present embodiment, in particular, the second bag 36 is configured to include an upper deploying portion 39 that inflates and deploys above the head of the occupant 2 by the pressure fluid supplied from the inflator 13. Thereby, when the airbag 11 is inflated and deployed, the upper deployment portion 39 of the second bag 36 is inflated and deployed above the head of the occupant 2 to restrict the upward movement of the head of the occupant 2. it can. As a result, it is possible to reduce the burden on the passenger's head at the time of a vehicle collision (including a side collision) or a rollover.

  Next, a second embodiment of the airbag apparatus according to the present invention will be described with reference to FIGS. Portions other than the portions shown in FIGS. 10 and 11 of the airbag device of the second embodiment are the same as or equivalent to the portions shown in FIGS. 2, 3, and 6 to 9 of the airbag device of the first embodiment. Since there is, explanation is omitted.

  FIG. 10 is a schematic side view of a vehicle seat 1 provided with an airbag according to the second embodiment of the present invention. FIG. 10 (a) shows a normal state, and FIG. 10 (b) shows an airbag when inflated. ing. In FIG. 10, the same or equivalent components as those shown in FIG.

  The seat 1 is equipped with an airbag device 10 in the backrest 1B for restraining the head 2A of the occupant 2 when the vehicle rolls over due to an accident. The airbag device 10 includes an airbag 11 provided so as to be deployed near the head 2A of the occupant 2 at the time of inflation, a retainer 12 that is accommodated in a state in which the airbag 11 is folded, and the airbag 11 And an inflator 13 (see FIGS. 2 and 3) for supplying gas (pressure fluid) for inflating and expanding. Further, the seat 1 includes a seat frame 14 that includes a side plate 14A (see FIG. 2), a cross member 14B (see FIG. 2), and the like and forms a skeleton of the seat 1, and the retainer 12 and the inflator. 13 is provided on the seat frame 14.

  As shown in FIG. 10 (a), the airbag 11 is housed in a folded state in the retainer 12 at normal times. As shown in FIG. 10 (b), one end of a belt-like tether strap 70 (tensile means) is connected to the lower front portion of the shoulder pressing portion 38A of the airbag 11, and the other end of the tether strap 70 is a seat. The frame 14 is connected to pins 14C provided at the lower part of the side plate 14A. In normal times, the tether strap 70 is housed in notches (slits) (not shown) formed on both sides of the backrest 1B. 10 shows only the tether strap 70 on the left side (front side of the paper surface in FIG. 10) of the occupant 2, but the shoulder pressing portion is also configured in the same manner on the right side (back side of the paper surface in FIG. 10) of the occupant 2. A tether strap 70 is provided at the lower front of 38A.

  When the automobile collides and rolls over, the airbag 11 is inflated and deployed near the head 2A of the occupant 2 as shown in FIG. At this time, the shoulder pressing portions 38A, 38A of the airbag 11 are inflated and deployed above both shoulders on the side of the occupant's head 2A, and the tether straps 70, 70 are pulled out from the cut portions and extend linearly. The holding portions 38A and 38A are pulled downward to hold the passenger's shoulders from above and restrain the body to the seat 1.

  FIG. 11 is a plan view seen from the second base fabric side showing the overall structure of the first bag 35 of the second embodiment before being inflated and deployed (before being folded for storage). In addition, since the 1st bag 35 is a substantially left-right symmetric form, description of the left half is abbreviate | omitted. An ear portion 38B is formed at the lower front portion of the shoulder pressing portion 38A of the first bag 35, and one end portion of a belt-like tether strap 70 is connected to the ear portion 38B. Since portions other than the ear portion 38B of the first bag 35 of the second embodiment are the same as those of the first bag 35 of the first embodiment shown in FIG.

  In the present embodiment, when the airbag 11 is inflated and deployed, the shoulder pressing portions 38A and 38A are pulled downward by the tether straps 70 and 70, respectively, while the shoulder pressing portions 38A and 38A are used to raise both shoulders of the passenger 2. The body movement of the occupant 2 (especially movement in the vertical direction) is restricted. This further restricts movement of the occupant 2 body (particularly movement in the vertical direction) by increasing the pressing force by the shoulder pressing portions 38A, 38A at the time of a vehicle collision (including a side collision) or rollover. Can do. Therefore, occupant restraint can be further improved.

  Next, a third embodiment of the airbag apparatus according to the present invention will be described with reference to FIGS. Portions other than the portions shown in FIGS. 12 and 13 of the airbag device of the third embodiment are the same as or equivalent to the portions shown in FIGS. 2, 3, and 6 to 9 of the airbag device of the first embodiment. Since there is, explanation is omitted.

  FIGS. 12A and 12B are schematic side views of the automobile seat 1 provided with the airbag according to the third embodiment of the present invention. FIG. 12A shows a normal state, and FIG. 12B shows the airbag when inflated. ing. In FIG. 12, the same or equivalent components as those shown in FIG.

  The seat 1 is equipped with an airbag device 10 in the backrest 1B for restraining the head 2A of the occupant 2 when the vehicle rolls over due to an accident. The airbag device 10 includes an airbag 11 provided so as to be deployed near the head 2A of the occupant 2 at the time of inflation, a retainer 12 that is accommodated in a state in which the airbag 11 is folded, and the airbag 11 And an inflator 13 (see FIGS. 2 and 3) for supplying gas (pressure fluid) for inflating and expanding. Further, the seat 1 includes a seat frame 14 that includes a side plate 14A (see FIG. 2), a cross member 14B (see FIG. 2), and the like and forms a skeleton of the seat 1, and the retainer 12 and the inflator. 13 is provided on the seat frame 14.

  As shown in FIG. 12A, the airbag 11 is stored in a state in which the airbag 11 is folded in the retainer 12 in a normal state.

  When the automobile collides or rolls over, the airbag 11 is inflated and deployed near the head 2A of the occupant 2 as shown in FIG. At this time, a front shoulder pressing portion 38C protruding downward from the shoulder pressing portion 38A is formed in front of the shoulder pressing portion 38A of the airbag 11. As a result, the shoulder pressing portions 38A, 38A and the front shoulder pressing portions 38C, 38C of the airbag 11 are inflated and deployed to the upper side and the front side of the occupant head 2A. Press and restrain.

  FIG. 13 is a plan view seen from the second base fabric side showing the overall structure of the first bag 35 of the third embodiment before being inflated and deployed (before being folded for storage). In addition, since the 1st bag 35 is a substantially left-right symmetric form, description of the left half is abbreviate | omitted. A front shoulder pressing portion 38C protruding downward from the shoulder pressing portion 38A is formed in front of the shoulder pressing portion 38A of the first bag 35. Since parts other than the front shoulder pressing portion 38C of the first bag 35 of the third embodiment are the same as those of the first bag 35 of the first embodiment shown in FIG.

  In the third invention of this application, when the airbag 11 is inflated and deployed at the time of a vehicle collision (including a side collision) or rollover, the shoulder of the occupant 2 is pressed from above by the shoulder pressing portions 38A, 38A. Both shoulders of the occupant 2 are pressed from the front by the front shoulder pressing portions 38C, 38C formed on the shoulder pressing portions 38A, 38A. Thereby, not only the movement of the body of the occupant 2 in the vertical direction but also the movement in the front-rear direction can be restricted, and a collision into the vehicle can be further suppressed. Therefore, occupant restraint can be further improved.

  Next, a fourth embodiment of the airbag apparatus according to the present invention will be described with reference to FIGS. Portions other than the portions shown in FIGS. 14 and 15 of the airbag device of the fourth embodiment are the same as or equivalent to the portions shown in FIGS. 2, 3, and 6 to 9 of the airbag device of the first embodiment. Since there is, explanation is omitted.

  FIG. 14 is a schematic side view of a vehicle seat 1 provided with an airbag according to a fourth embodiment of the present invention. FIG. 14 (a) shows a normal state and FIG. 14 (b) shows an airbag inflated. ing. In FIG. 14, the same or equivalent components as those shown in FIG.

  The seat 1 is equipped with an airbag device 10 in the backrest 1B for restraining the head 2A of the occupant 2 when the vehicle rolls over due to an accident. The airbag device 10 includes an airbag 11 provided so as to be deployed near the head 2A of the occupant 2 at the time of inflation, a retainer 12 that is accommodated in a state in which the airbag 11 is folded, and the airbag 11 And an inflator 13 (see FIGS. 2 and 3) for supplying gas (pressure fluid) for inflating and expanding. Further, the seat 1 includes a seat frame 14 that includes a side plate 14A (see FIG. 2), a cross member 14B (see FIG. 2), and the like and forms a skeleton of the seat 1, and the retainer 12 and the inflator. 13 is provided on the seat frame 14.

  The airbag 11 includes a first bag 35 (see FIG. 15) in which a first base fabric and a second base fabric are sewn together, and a second bag 36 (see FIG. 6) in which a third base fabric and a fourth base fabric are sewn together. ) And a flow path coupling member 60 (see FIGS. 4, 7, and 8) that couples the first bag 35 and the second bag 36.

  As shown in FIG. 15, the first bag 35 of the fourth embodiment is not provided with the gas outlet channel 35 t provided in the first bag 35 of the first to third embodiments, and has a gas supply port. The portions other than 35a are closed, and no gas is supplied to the second bag 36. Therefore, when the first bag 35 is inflated and deployed, the second bag 36 is pulled and deployed by the first bag 35. However, the second bag 36 does not inflate into a bag shape, and becomes the first screen shield (shielding means). The bag 35 is expanded with the expansion of the bag 35.

  The second bag 36 does not need to be sewn as a bag-like bag, and may be sewn as a screen shield. Further, the base fabric at the upper center of the first bag 35 may be extended to serve as a screen shield for the ceiling portion of the airbag 11.

  When the automobile collides or rolls over, the airbag 11 is inflated and deployed near the head 2A of the occupant 2 as shown in FIG. A pressure fluid is supplied from the inflator 13 to the shoulder pressing portion 38A of the airbag 11, inflated and deployed above the side shoulder portion of the occupant's head 2A, and restrained by pressing the shoulder portion of the occupant 2 from above. The head 2A is protected by a screen shield.

  In the airbag device 10 according to the fourth embodiment, since the shoulder pressing portion 38A is provided that extends above the shoulder portion of the occupant 2 and sandwiches the left and right sides of the head 2A of the occupant 2 and presses both shoulders from above. In the event of a rollover or a side collision, the lateral movement of the occupant head 2A is restricted, and the movement of the occupant 2 body (especially the vertical movement) is restricted to prevent collisions in the vehicle. Can do. Further, since the airbag 11 can be downsized while maintaining the restraining function of restraining the shoulder portion of the occupant 2 as described above, it is not necessary to supply gas to the second bag 36 as a screen shield. 13 can be reduced in size.

  In addition, the upper development part 39 of Embodiment 2 and 3 is good also as a screen shield which does not expand | swell.

  The specific configurations of the above-described embodiments do not strictly limit the contents of the present invention, and it is needless to say that details can be variously changed in accordance with the spirit of the present invention.

1 is a schematic side view of an automobile seat provided with Embodiment 1 of an airbag device of the present invention. It is a perspective view showing the fixation structure to the seat frame of embodiment of the airbag apparatus of this invention. It is a disassembled perspective view of the airbag apparatus showing the fixing structure shown in FIG. 2 in detail. It is a perspective view showing the whole structure of the air bag of the state which inflate-deployed. It is the top view seen from the 2nd base fabric showing the whole structure in the state before the inflation deployment of the 1st bag of Embodiment 1. It is the top view seen from the 4th base cloth showing the whole structure in the state before the expansion deployment of the 2nd bag. FIG. 5 is an enlarged perspective view of a portion where one of the outlet channels and the inlet channel in FIG. It is sectional drawing of the VIII-VIII 'line cross section in FIG. It is sectional drawing of the IX-IX 'line cross section in FIG. It is a schematic side view of the vehicle seat provided with Embodiment 2 of the airbag device of the present invention. It is the top view seen from the 2nd base fabric showing the whole structure in the state before expansion deployment of the 1st bag of Embodiment 2. FIG. It is a schematic side view of the vehicle seat provided with Embodiment 3 of the airbag apparatus of the present invention. It is the top view seen from the 2nd base fabric showing the whole structure in the state before expansion deployment of the 1st bag of Embodiment 3. FIG. It is a schematic side view of the vehicle seat provided with Embodiment 4 of the airbag apparatus of the present invention. It is the top view seen from the 2nd base fabric showing the whole structure in the state before expansion deployment of the 1st bag of Embodiment 4.

Explanation of symbols

2 Crew 11 Airbag 13 Inflator 35A First base fabric 35B Second base fabric 36A Third base fabric 36B Fourth base fabric 40 Sewing joint portion 41 Sealing material portion 35 First bag 35a Gas supply port 35t Deriving flow channel 36 Second Bag (screen shield)
36i Introducing channel 37 Pressing development part 38 Supporting development part 38A Shoulder pressing part 38C Front shoulder pressing part 39 Upper developing part (screen shield)
50 downward development part 60 flow path coupling member 61 hollow communication pipe 62 outer periphery clamping part 70 tether strap (tensioning means)

Claims (6)

  An airbag that inflates and deploys near the head of an occupant, comprising: a shoulder pressing portion that inflates and deploys above a shoulder on a side of the head and presses the shoulder from above. The airbag according to claim 1,
An airbag, wherein a pulling means for pulling the inflated and deployed shoulder pressing portion downward is connected to a lower front portion of the shoulder pressing portion. The airbag according to claim 1,
A front shoulder pressing portion for pressing the shoulder portion from the front is formed at a front lower portion of the shoulder pressing portion. The airbag according to any one of claims 1 to 3,
An airbag comprising an upper deployment part that inflates and deploys above the head. The airbag according to any one of claims 1 to 3,
An airbag comprising non-inflatable shielding means that expands above the head. An airbag according to any one of claims 1 to 5,
An airbag device comprising an inflator for supplying a pressure fluid for inflating and deploying the airbag.

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