JP6224932B2 - Air bag and air bag device - Google Patents

Description

  The present invention relates to an airbag and an airbag device, and more particularly to an autonomous airbag and an airbag device.

  It has become common for vehicles such as automobiles to be equipped with an airbag device for inflating and deploying an airbag in the vehicle in the event of an emergency such as a collision or sudden deceleration to absorb the impact generated on the passenger. Yes. These airbag devices generally include an airbag that is normally folded and inflated and deployed in an emergency, an inflator that supplies gas to the airbag, a retainer that holds the airbag and the inflator, and And an airbag cover that covers the airbag.

  When the vehicle collides or suddenly decelerates, gas is supplied from the inflator to the airbag, the airbag is inflated, the airbag cover is opened, the airbag is released into the vehicle, and is inflated and deployed. In particular, in the case of an airbag device for a passenger seat, the airbag is mounted in an opening formed in the instrument panel, and the airbag is inflated and deployed in a space surrounded by the instrument panel, the windshield (windshield) and the passenger. Is done.

  By the way, in such an airbag device, the airbag is inflated and deployed on the instrument panel without using the reaction force from the windshield (windshield) from the viewpoint of cost reduction, parts commonality, miniaturization, etc. Has also been proposed (see, for example, Patent Document 1). Thus, the airbag that is inflated and deployed on the instrument panel without using the reaction force from the windshield is referred to as a “self-supporting airbag”.

  The self-supporting airbag described in Patent Literature 1 has a front inflating portion that inflates to the windshield side and a rear inflating portion that inflates to the occupant side, and the front inflating portion of the instrument panel is inflated and deployed. A bottom portion pressed against the surface and a front portion protruding in a protruding manner toward the windshield are provided.

JP 2012-144201 A

  Although the self-supporting airbag described in Patent Document 1 described above includes a front inflating portion having a bottom portion that is pressed against the surface of the instrument panel during inflating and deploying, most of the gas that inflates the air bag is on the passenger side (rear side). ), The adjustment and design for maintaining the degree of adhesion between the airbag and the instrument panel is complicated and complicated.

  The present invention has been devised in view of such problems, and is capable of facilitating adjustment and design of an airbag, and improving the degree of adhesion between the airbag and the instrument panel, and the airbag and the airbag. An object is to provide an apparatus.

According to the present invention, it is normally folded and accommodated in the opening of the instrument panel, and gas is supplied in an emergency without using the reaction force from the windshield between the windshield and the occupant. In the airbag inflated and deployed on the instrument panel, the airbag has a front inflating portion that inflates toward the windshield side and a rear inflating portion that inflates toward the occupant side, and the front inflating portion The portion includes a bottom portion pressed against the surface of the instrument panel during expansion and deployment, and a pair of side surface portions connected to both side portions of the bottom portion, and an outer shape on the bottom side of the base fabric constituting the side surface portion has an extended portion overhanging the instrument panel side of the ground plan line in inflation and deployment completion status of the airbag, inflation and deployment of the air bag To, the excess of the base fabric constituted by the extension portion, said front expansion portion by suppressing the floating of the bottom and so as to close contact with the surface of the instrument panel, airbag provided, characterized in that Is done.

Further, according to the present invention, it is normally folded and accommodated in the opening of the instrument panel, and gas is supplied in an emergency and the reaction force from the windshield is utilized between the windshield and the occupant. An air bag that is inflated and deployed on the instrument panel without the air bag, an inflator that supplies the gas to the air bag, a retainer that holds the air bag and the inflator, and covers the air bag and the instrument An airbag cover comprising a part of a passenger panel, wherein the airbag has a front inflating portion that inflates toward the windshield side and a rear inflating portion that inflates toward the occupant side. The front inflatable part is pressed against the surface of the instrument panel when inflated and deployed; A pair of side portions connected to both side portions of the bottom portion, and the outer shape of the bottom side of the base fabric constituting the side portion is more than the planned grounding line in a state where the airbag is inflated and deployed. An expansion portion that protrudes toward the panel side, and when the airbag is inflated and deployed, an excess base fabric configured by the expansion portion suppresses the bottom portion from being lifted, and the front expansion portion is attached to the instrument panel. Provided is an airbag device characterized in that the airbag device is brought into close contact with the surface .

  In the airbag and the airbag apparatus according to the present invention described above, the ground contact line is formed so that the bottom portion is along the surface of the instrument panel when the airbag is inflated and deployed. It is the external shape of the said side part in a case. Further, the inflated and deployed state of the airbag is an inflated and deployed shape of the airbag during a time when the occupant seated in a normal posture on the seat comes into contact with the airbag in an emergency.

  Further, the rear inflating portion includes a bottom portion pressed against the surface of the instrument panel during inflating and deployment, and a pair of side surface portions connected to both side portions of the bottom portion, and a base fabric constituting the side surface portion. The outer shape on the bottom side may have a second extension portion that protrudes toward the instrument panel with respect to a planned ground line in a state where the airbag is inflated and deployed.

  In addition, the airbag includes a center panel that forms the bottom portion and is formed in an annular shape, and a pair of side panels that form the side surface portion and seal both side portions of the center panel. Also good.

  According to the airbag and the airbag apparatus according to the present invention described above, the extended portion that protrudes to the instrument panel side from the planned grounding line is formed on the base fabric that forms the side surface portion of the airbag (front inflation portion). As a result, the degree of adhesion between the airbag and the instrument panel can be improved compared to an airbag that does not have the expansion portion, and the adjustment and design of the self-supporting airbag can be facilitated.

1 is an overall configuration diagram showing an airbag device according to a first embodiment of the present invention. It is a panel block diagram of the airbag shown in FIG. FIG. 2 is a front view showing an inflating and deploying process of the airbag shown in FIG. 1, wherein (A) shows a stage before inflating and deploying, (B) shows an intermediate stage, and (C) shows an inflating and deploying completion stage. It is a figure which shows the modification of a side panel, (A) shows a 1st modification, (B) shows a 2nd modification, (C) shows a 3rd modification, (D) shows a 4th modification. Yes. It is a figure which shows the airbag apparatus which concerns on 2nd embodiment of this invention, (A) is a top view of a side panel, (B) is the modification of a side panel, (C) is the expansion | deployment intermediate stage of an airbag, Is shown. It is a figure which shows the airbag apparatus which concerns on other embodiment of this invention, (A) has shown 3rd embodiment, (B) has shown 4th embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. Here, FIG. 1 is an overall configuration diagram showing the airbag apparatus according to the first embodiment of the present invention. FIG. 2 is a panel configuration diagram of the airbag shown in FIG. 3 is a front view showing an inflating and deploying process of the airbag shown in FIG. 1, wherein (A) shows a stage before inflating and deploying, (B) shows an intermediate stage, and (C) shows an inflating and deploying completion stage. Yes. In FIG. 1, for convenience of explanation, portions other than the airbag device are illustrated by a one-dot chain line.

  As shown in FIGS. 1 to 3, the airbag device according to the first embodiment of the present invention is normally folded and accommodated in the opening of the instrument panel I, and is supplied with gas in an emergency. An airbag 1 that is inflated and deployed on the instrument panel I without using a reaction force from the windshield W between the windshield W and the occupant M, an inflator 2 that supplies gas to the airbag 1, and an air A retainer 3 that holds the bag 1 and the inflator 2 and an airbag cover 4 that covers the airbag 1 and forms part of the instrument panel I are provided. The airbag 1 is inflated toward the windshield W. A front inflatable portion 11 and a rear inflatable portion 12 inflated toward the occupant M side. The bottom 11a side of the base fabric 5 that includes the bottom 11a to be attached and a pair of side parts 11b connected to both sides of the bottom part 11a, and the base cloth 5 constituting the side part 11b is inflated and deployed. It has the extended part 51 which protruded to the instrument panel I side rather than the earthing | grounding planned line Li in a state. In the airbag 1 according to the present embodiment, the vertical direction means the vertical direction, and the front-rear direction means a direction that matches the front-rear direction of the vehicle.

  The airbag device shown in FIG. 1 is a so-called passenger seat airbag device, and the airbag 1 is inflated into a space surrounded by, for example, an occupant M seated on a seat S, a windshield W, and an instrument panel I. Be expanded. Here, if the angle between the upper surface portion of the instrument panel I on which the airbag apparatus is disposed and the vertical line Lg is defined as θ, and the angle between the windshield W and the vertical line Lg is defined as φ, the illustrated instrument The angle θ of the panel I is about 90 °. These angles θ and φ are numerical values that change for each vehicle type on which the airbag device is mounted, and are not limited to the illustrated angles.

  Moreover, the convex part C may be formed in the passenger | crew side surface of the instrument panel I. FIG. The convex portion C may be, for example, a control panel portion including a liquid crystal panel for displaying a car navigation or television broadcast screen, an audio device, an air conditioner, an air conditioner outlet, or an instrument. It may be a cup holder or a bottle holder attached to the ment panel I.

  As shown in the figure, the airbag 1 is a self-supporting airbag that does not come into contact with the windshield W in the inflated and deployed state. In such a self-supporting airbag, the bottom surface of the airbag 1 (the bottom portion 11a of the front inflating portion 11) is in close contact with the surface of the instrument panel I without using the reaction force from the windshield W in the inflated and deployed state. It is configured to maintain the state.

  Here, “the airbag 1 is self-supporting” is not limited to the case where the airbag 1 after completion of the inflation and deployment has a certain gap with the windshield W, as shown in the figure. Even when W is in contact with the windshield W, the reaction force from the windshield W is small and the airbag 1 is substantially independent.

  As shown in FIG. 1, the airbag 1 is inflated and deployed forward (windshield W side) from the center line Lc of the opening of the airbag cover 4 and rearward from the center line Lc. And a rear inflating part 12 inflated and deployed on the (occupant M side). Since the airbag 1 is a self-supporting airbag, it is preferable that the airbag 1 is attached to the surface of the instrument panel I. Therefore, it is preferable that the bottom part of the airbag 1, that is, the bottom part 11 a of the front inflating part 11 and the bottom part 12 a of the rear inflating part 12 are in close contact with the surface of the instrument panel I.

  In particular, in order to suppress the behavior of the airbag 1 that is about to rotate forward due to the inertial force generated in the airbag 1 and the lifting of the airbag 1 due to the gas pressure generated when the airbag 1 is inflated and deployed, the front inflating portion 11 is suppressed. It is important to increase the rigidity by maintaining the internal pressure and to bring the bottom 11a of the front expansion portion 11 into close contact with the surface of the instrument panel I. The panel configuration of the airbag 1 will be described later.

  Further, a vent hole 13 that discharges gas in the airbag 1 to the outside when the occupant M comes into contact with the airbag 1 may be formed in the side surface portion of the rear inflating portion 12. It is preferable that the vent hole 13 is formed at a position separated so as not to affect the internal pressure retention of the front expansion portion 11. Although not shown, a patch cloth may be disposed on the outer peripheral surface of the front inflating portion 11 of the airbag 1 to increase the rigidity of the front portion (front inflating portion 11) of the airbag 1.

  In FIG. 1, the inflated and deployed state of the airbag 1 is illustrated, but in the state before the airbag 1 is inflated and deployed, as shown in FIG. 3A, the surface of the airbag cover 4 is an instrument. It constitutes part of panel I. Further, as shown in FIG. 1, the airbag cover 4 includes a plate-like portion 41 that constitutes a vehicle interior surface, an inner case 42 that is disposed on the back surface of the plate-like portion 41 and constitutes a discharge port of the airbag 1, The plate-like portion 41 has a door portion 43 formed so as to be capable of being cleaved when the airbag 1 is inflated and deployed. Here, although the structure which fits the airbag cover 4 in the opening part formed in the instrument panel I is illustrated, the airbag cover 4 may be formed integrally with the instrument panel I. In addition, the structure of the airbag cover 4 is not limited to what was illustrated, What was used conventionally can be selected suitably and can be used.

  The inflator 2 has a substantially columnar outer shape, and a gas outlet is formed on the side peripheral surface of the tip portion included in the airbag 1. The inflator 2 is fitted into an opening formed in the retainer 3 and is fixed to the retainer 3 by fixing means such as a bag ring. The inflator 2 is connected to an ECU (electronic control unit) (not shown) and is controlled based on measurement values of an acceleration sensor or the like. When the ECU detects an emergency such as a vehicle collision or sudden deceleration, the chemical stored in the inflator 2 is burned to generate gas, and the gas is supplied to the airbag 1. Note that the shape and fixing method of the inflator 2 are not limited to the illustrated configuration, and a conventionally used configuration can be appropriately selected and used.

  The retainer 3 is locked to a locking hole formed in the inner case 42 by, for example, a hook connected to a side surface portion, and is connected to an in-vehicle structure 6 such as a reinforcement through a joining member. Has been. In addition, about the retainer 3 and its connection structure, it is not limited to what was illustrated, What was used conventionally can be selected suitably and can be used.

  The airbag 1 mentioned above has a panel structure as shown, for example in FIG. As shown in FIG. 2, the airbag 1 includes a center panel 14 that forms a bottom portion 11 a and is formed in an annular shape, and a pair of side panels that form side surfaces 11 b and seal both side portions of the center panel 14. 15. The side panel 15 corresponds to the base fabric 5 constituting the side surface portion 11 b of the front expansion portion 11 and the side surface portion 12 b of the rear expansion portion 12, and the center panel 14 is the base fabric 5 constituting the bottom portion 11 a of the front expansion portion 11. It corresponds to ′. In FIG. 2, the illustration of the seam allowance portion of each panel is omitted for convenience of explanation.

  The center panel 14 (base fabric 5 ') includes a bottom surface forming portion 14a that forms the bottom portion 11a of the airbag 1, a front surface forming portion 14b that forms the passenger contact surface, and a top surface forming portion 14c that forms the top surface of the airbag 1. The width in the left-right direction of the front surface forming portion 14b is formed wider than the width in the left-right direction of the bottom surface forming portion 14a and the upper surface forming portion 14c. As described above, the center panel 14 can be divided into the bottom surface forming portion 14a, the front surface forming portion 14b, and the top surface forming portion 14c, and is sewn along the outer periphery of the side panel 15. Therefore, the end portion of the bottom surface forming portion 14a and the end portion of the upper surface forming portion 14c are stitched together to form an annular shape along the front-rear direction of the airbag 1. Note that an opening 14d for inserting the inflator 2 is formed in the bottom surface forming portion 14a.

  The center panel 14 shown in FIG. 2 is arranged so as to be aligned with the bottom surface forming portion 14a, the front surface forming portion 14b, and the top surface forming portion 14c from the left side of the drawing. That is, the cutting position of the center panel 14 can be arbitrarily set. Therefore, for example, the center panel 14 may be cut so that a stitching position is formed at an intermediate portion between the bottom surface forming portion 14a and the top surface forming portion 14c. Note that the total length of the center panel 14 is adjusted to match the outer shape of the side panel 15 described later.

  The shape and size of the side panel 15 (base fabric 5) are designed so that the airbag 1 has a desired shape when the airbag 1 is inflated and deployed. Here, the point corresponding to the apex of the airbag 1 is P, the point corresponding to the lowest end point of the rear inflating portion 12 of the airbag 1 is Q, and the occupant is drawn into the inner case 42 when the airbag 1 is inflated and deployed. The point corresponding to the end point on the M side (rear) is R, and the point corresponding to the end point on the windshield W side (front) that is drawn into the inner case 42 when the airbag 1 is completely inflated and deployed is S. A point corresponding to the most advanced point is T, and points on the occupant M side (rear) and windshield W side (front) corresponding to the fastening point of the inflator 2 are V1 and V2, respectively.

  Since the outer shape of the side panel 15 between the PQs constitutes a portion in contact with the occupant M, it has a curved shape that is convex toward the occupant M side. Since the outer shape of the side panel 15 between the QRs constitutes a portion in contact with the instrument panel I, it has a shape having a depression along the shape of the instrument panel I. If the deepest point of this dent is set to H, the depth (height of the point H) D of this dent will be suitably changed by the shape of the instrument panel I and the presence or absence of the convex part C.

  The outer shape of the side panel 15 between the RSs constitutes a portion arranged in the inner case 42 when the airbag 1 is inflated and deployed, and a curved portion smoothly connected to the curve QR and a straight portion connected to the straight line ST. And have. Moreover, since the external shape of the side panel 15 between PT includes the upper surface part of the front expansion part 11 of the airbag 1, it has the shape curved largely. Thus, by forming the space between the PTs so as to protrude toward the windshield W, the capacity of the front inflating portion 11 can be secured, and the internal pressure can be easily maintained. In the conventional airbag that holds the posture by utilizing the reaction force of the windshield W, the point T is arranged close to the point S or the point T and the point S coincide with each other, and The side panels are often formed in a straight line.

  By the way, the self-supporting airbag described in Patent Document 1 also makes the bottom portion of the airbag contact the surface of the instrument panel. However, the shape of the side panel of the airbag is such that the bottom of the airbag coincides with the surface of the instrument panel in a state where the airbag has been inflated and deployed (conceptually, the airbag is in a contact state without receiving a reaction force). Designed to be Here, in a state where the airbag 1 has been inflated and deployed, the bottom 11a of the airbag 1 coincides with the surface of the instrument panel I (conceptually, it is in a state of contact without receiving a reaction force). If the outer shape on the bottom 11a side of the side panel 15 when the bag 1 is formed is a grounding planned line Li, in the conventional self-supporting airbag, the outer shape on the bottom side of the side panel is determined along the grounding planned line Li. .

  In the present embodiment, “the inflated and deployed state of the airbag 1” means the inflated and deployed shape of the airbag 1 at the time when the occupant M seated in the seat S in a normal posture contacts the airbag 1 in an emergency. I mean. In FIG. 1, the occupant M seated in the seat S in a normal posture is indicated by a one-dot chain line, and the occupant M in a state of being turned forward in an emergency is indicated by a two-dot chain line. For example, the occupant contact time at the time of a frontal collision of the vehicle is set approximately 20 to 50 ms from the start of the inflation and deployment of the airbag 1. In other words, it can be rephrased into a shape in which a time of about 20 to 50 ms has elapsed from the start of the expansion and deployment of the above.

  The ground contact line Li is defined by, for example, a straight line passing through the point S. If the intersection point with the outer shape of the side panel 15 is a point U, it coincides with a straight line connecting the point S and the point U. Note that, in the conventional airbag, the point S is generally arranged on a straight line connecting the point R and the point U from the viewpoint of ease of processing and the like. Therefore, in the conventional self-supporting airbag, when the airbag is inflated and deployed, it is formed so as to easily come into contact with the surface of the instrument panel. Adjustment and design for maintaining the degree of adhesion with the device were complicated and complicated.

  On the other hand, the side panel 15 (base fabric 5) in the present embodiment has an extended portion 51 that projects to the instrument panel I side (outside) from the planned ground line Li. The extended portion 51 is configured by a substantially fan-shaped or substantially triangular area (filled portion in the figure) surrounded by the points S, T, and U. If the straight line passing through the point S and the point T is Lp, the angle α formed by the planned ground line Li and the straight line Lp is set within a range of 5 to 45 °, for example. In the illustrated embodiment, the angle α is set so that the points R, S, and U are arranged on a straight line.

  By forming the expansion portion 51, the bottom portion 11a of the airbag 1 in the inflated and deployed state can be conceptually inserted into the instrument panel I. In reality, the airbag 1 is instrumented. Since it does not sink into the panel I, the airbag 1 receives a large reaction force from the instrument panel I, and the degree of adhesion between the bottom portion 11a of the airbag 1 and the surface of the instrument panel I can be improved. . Therefore, even when the airbag 1 is about to rise due to inertial force or reaction force, the state in which the airbag 1 is in contact with the surface of the instrument panel I can be maintained by the extended portion 51 constituting the surplus base fabric 5. it can.

  As shown in FIG. 3A, the airbag 1 is normally folded and accommodated in the opening of the instrument panel I. In an emergency such as a collision of the vehicle, gas is supplied from the inflator 2 to the airbag 1, and the airbag 1 is torn the door 43 of the airbag cover 4 and released into the vehicle.

  The airbag 1 has a front inflating portion 11 that inflates to the windshield W side and a rear inflating portion 12 that inflates to the occupant M side. As shown in FIG. In the middle stage of inflation and deployment, the front inflation portion 11 and the bottom portions 11a and 12a of the rear inflation portion 12 are in close contact with the surface of the instrument panel I due to the internal pressure of the airbag 1 in an obliquely upward rearward direction (in the direction of the arrow in the figure). It expands and expands. At this time, while the airbag 1 is pulled backward by the gas, the airbag 1 tends to float due to an inertial force generated at the time of a vehicle collision or a reaction force from the instrument panel I, but the side panel 15 in the present embodiment is expanded. Since the portion 51 is formed, when the expansion portion 51 is pressed against the surface of the instrument panel I, the lifting of the airbag 1 can be suppressed.

  Thereafter, as shown in FIG. 3 (C), the airbag 1 is inflated and deployed downward and obliquely backward (in the direction of the arrow in the figure), and reaches the inflated and deployed state. In this case as well, the airbag 1 is pulled backward by the gas, but tends to float due to the inertial force generated at the time of the vehicle collision or the reaction force from the instrument panel I, but the airbag 1 is lifted by the expansion portion 51. Can be suppressed.

  Therefore, according to the airbag 1 described above, the degree of adhesion between the airbag 1 and the instrument panel I can be improved at the intermediate stage and completion stage of the inflation and deployment of the airbag 1, Oscillation or the like of the airbag 1 that occurs can be suppressed, and the inflation and deployment behavior of the airbag 1 can be further stabilized. In addition, since only the expansion part 51 needs to be formed, adjustment and design of the airbag 1 can be facilitated.

  Next, a modified example of the side panel 15 described above will be described with reference to FIG. Here, FIG. 4 is a figure which shows the modification of a side panel, (A) is a 1st modification, (B) is a 2nd modification, (C) is a 3rd modification, (D) is a 1st modification. Four modified examples are shown. In addition, about the same component as 1st embodiment mentioned above, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  In the first modification shown in FIG. 4A, the expanded portion 51 is formed larger. For example, when the angle α shown in FIG. 2 is increased, the straight line Lp may be rotated downward (in the direction in contact with the instrument panel I) around the point S.

  The second modification shown in FIG. 4B assumes a case where the planned ground line Li has an angle larger than the angle α shown in FIG. In such a case, the extended portion 51 having a required size may be formed by rotating the straight line Lp upward about the point S.

  In the third modified example shown in FIG. 4C, the points R, S, and U are arranged on a straight line. Thus, even when the points R, S, and U are arranged on a straight line, the instrument panel I side (outward) from the planned ground line Li as in the first embodiment described above. The extended extension 51 can be easily formed. In particular, in the third modification, the side panel 15 can be easily processed.

  In the fourth modified example shown in FIG. 4D, the extended portion 51 is formed in a substantially semicircular shape. Thus, even when the shape between the STs constituting the expansion portion 51 is formed in a curved shape such as a substantially semicircular shape or a substantially elliptical shape, the same effects as those of the first embodiment described above are obtained.

  Next, an airbag according to a second embodiment of the present invention will be described with reference to FIG. Here, FIG. 5 is a figure which shows the airbag apparatus which concerns on 2nd embodiment of this invention, (A) is a top view of a side panel, (B) is a modification of a side panel, (C) is air. The intermediate stage of expansion and deployment of the bag is shown. In addition, about the same component as 1st embodiment mentioned above, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  In the second embodiment shown in FIGS. 5 (A) to 5 (C), the rear inflating part 12 of the airbag 1 is pressed against the surface of the instrument panel I at the time of inflating and deploying on both sides of the bottom part 12a. And the bottom 12a side of the base fabric 5 constituting the side surface portion 12b has an outer shape on the instrument panel I than the planned ground line Li ′ in the inflated and deployed state of the airbag 1. It has the 2nd expansion part 52 projected on the side. Here, since the side part 11b of the front expansion part 11 and the side part 12b of the rear expansion part 12 are comprised by the same base fabric 5, the side panel 15 mentioned above forms the side part 11b and the side part 12b. Will be.

  As shown in FIG. 5A, the second extension portion 52 corresponds to, for example, a point H corresponding to the deepest point of the depression of the side panel 15 and a fastening point on the occupant M side (rear) of the inflator 2. It is formed between the point V1. 5A and 5B, the planned ground line Li ′ indicated by a broken line coincides with the curve between HV1 in the first embodiment that does not have the second extended portion 52.

  Thus, by forming the 2nd expansion part 52 in the side panel 15, the capacity | capacitance of the root part of the airbag 1 can be enlarged, and it showed to FIG. As described above, the airbag 1 can be pressed against the inner surface of the inner case 42 of the airbag cover 4 on the occupant M side and the surface of the instrument panel I, and the degree of adhesion of the airbag 1 can be improved. It is possible to easily maintain the state in which the airbag 1 is raised upward by force. Therefore, for example, even when the projection C is formed on the instrument panel I, the airbag 1 can be easily inflated and deployed by avoiding the projection C that is an obstacle by the rising of the airbag 1. it can.

  In particular, in this embodiment, by using together with the expansion part 51 in the first embodiment described above, the degree of adhesion of the front inflating part 11 and the rear inflating part 12 of the airbag 1 to the instrument panel I can be improved. It is possible and effective.

  Further, in the modification of the second embodiment shown in FIG. 5 (B), the second expansion portion 52 is placed at the end point on the occupant M side (rear) that is pulled into the inner case 42 when the airbag 1 is inflated and deployed. It is formed between a corresponding point R and a point V1 corresponding to a fastening point on the occupant M side (rear side) of the inflator 2. Even in such a configuration, the airbag 1 can be pressed against the inner surface of the inner case 42 of the airbag cover 4 on the side of the occupant M, the degree of adhesion of the airbag 1 can be improved, and the reaction force causes the air It is possible to easily maintain the state in which the bag 1 is erected upward.

  Next, an airbag according to another embodiment of the present invention will be described with reference to FIG. Here, FIG. 6 is a figure which shows the airbag apparatus which concerns on other embodiment of this invention, (A) has shown 3rd embodiment, (B) has shown 4th embodiment. In addition, about the same component as 1st embodiment mentioned above, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  The third embodiment shown in FIG. 6A has a rectifier 7 that controls the flow of gas inside the airbag 1. The rectifier 7 is formed in a bag shape, for example, and is directed toward the first opening 71 for releasing gas and the upper surface side of the airbag 1 so that the lower surface of the airbag 1 is in close contact with the surface of the instrument panel I. The second opening 72 for releasing gas and the third opening 73 for releasing gas toward the front expansion portion 11 are provided. By disposing such a rectifying body 7, the internal pressure of the front expansion portion 11 can be easily maintained. In addition, in each figure of FIG. 6, about the front part side of the airbag 1, a part of base fabric is removed and the inside of the airbag 1 is illustrated about the front side.

  In the fourth embodiment shown in FIG. 6B, the angle θ of the instrument panel I is formed larger than the angle θ (about 90 °) of the first embodiment. When the angle θ is greater than 90 °, the instrument panel I forms an inclined surface in front of the occupant M. In the case where the airbag 1 is mounted on the instrument panel I having such an inclined surface, there is little need to sink the airbag 1 below the instrument panel I. For example, the side panel 15 shown in FIG. The depth D and the position of the point Q may be changed as appropriate.

  Moreover, the airbag 1 shown to FIG. 6 (B) has the rectifier 7 comprised with a partition wall. The rectifier 7 has at least an upper end and a lower end connected to the inner surface of the airbag 1 and is disposed so as to partition the interior of the airbag 1 into a front inflating portion 11 and a rear inflating portion 12. The rectifier 7 includes a first opening 71 for releasing gas so that the lower surface of the airbag 1 is in close contact with the surface of the instrument panel I, and a second opening for releasing gas toward the upper surface side of the airbag 1. 72 is formed. Such a configuration can also increase the internal pressure of the front expansion portion 11.

  In the first embodiment to the fourth embodiment described above, whether the rectifying body 7 is arranged or whether the rectifying body 7 is formed in a bag shape or a partition wall shape depends on the size of the airbag 1 and the instrument panel I. This is a matter that can be arbitrarily selected according to the shape and other conditions, and is not limited to the illustrated configuration.

  Moreover, in 1st embodiment-4th embodiment mentioned above, the airbag 1 is not limited to the 3 piece structure comprised by the center panel 14 and the side panel 15, but the bottom part 11a of the front expansion part 11 at least. And if it has the base fabric 5 which comprises the side part 11b, the structure divided | segmented into 2 pieces may be sufficient, and the structure divided | segmented into 4 pieces or more may be sufficient.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Airbag 2 Inflator 3 Retainer 4 Airbag cover 5, 5 'Base fabric 6 Car interior structure 7 Rectifier 11 Front expansion part 11a Bottom part 11b Side surface part 12 Back expansion part 12a Bottom part 12b Side surface part 13 Vent hole 14 Center panel 14a Bottom surface Formation part 14b Front formation part 14c Upper surface formation part 14d Opening part 15 Side panel 41 Plate-like part 42 Inner case 43 Door part 51 Extension part 52 Second extension part 71 First opening part 72 Second opening part 73 Third opening part

Claims (6)

Normally, the instrument panel is folded and accommodated in the opening of the instrument panel, and gas is supplied in the event of an emergency, so that the reaction force from the windshield is not utilized between the windshield and the occupant. In the airbag inflated and deployed at
The airbag has a front inflating portion that inflates to the windshield side, and a rear inflating portion that inflates to the occupant side,
The front inflating part includes a bottom part pressed against the surface of the instrument panel during inflating and deployment, and a pair of side parts connected to both side parts of the bottom part,
The outer shape of the bottom side of the base fabric that constitutes the side surface portion has an extended portion that protrudes toward the instrument panel side from the planned ground line in the inflated and deployed state of the airbag ,
When the airbag is inflated and deployed, the surplus base fabric configured by the expansion portion suppresses the lifting of the bottom portion so that the front expansion portion is brought into close contact with the surface of the instrument panel.
An airbag characterized by that.   The ground contact line is an outer shape of the side surface portion when the airbag is formed so that the bottom portion is along the surface of the instrument panel when the airbag is inflated and deployed. The airbag according to claim 1.   The inflated and deployed state of the airbag is an inflated and deployed shape of the airbag during a time when the occupant seated in a normal posture on the seat comes into contact with the airbag in an emergency. The described airbag.   The rear inflating part includes a bottom part pressed against the surface of the instrument panel during inflating and deployment, and a pair of side parts connected to both side parts of the bottom part, and the bottom part of the base fabric constituting the side part 2. The airbag according to claim 1, wherein an outer shape of the airbag has a second expansion portion that protrudes toward the instrument panel from a ground contact line in a state where the airbag has been inflated and deployed.   The airbag includes a center panel that forms the bottom part and is formed in an annular shape, and a pair of side panels that form the side part and seals both side parts of the center panel. The airbag according to claim 1. Normally, the instrument panel is folded and accommodated in the opening of the instrument panel, and gas is supplied in the event of an emergency, so that the reaction force from the windshield is not utilized between the windshield and the occupant. An airbag that is inflated and deployed in the air, an inflator that supplies the gas to the airbag, a retainer that holds the airbag and the inflator, and covers the airbag and constitutes a part of the instrument panel In an airbag device having an airbag cover,
The said airbag is an airbag described in any one of Claims 1-5, The airbag apparatus characterized by the above-mentioned.