JP2007137225A - Air belt device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air belt device for a vehicle corresponding to such a complicated collision that a side collision is caused after a front collision. <P>SOLUTION: In the case of the frontal collision of the vehicle, an inflator is actuated in a single mode, and a lot of gas is supplied from an inflator into an inflation part 22 for protecting a chest to inflate the inflation part 22 for protecting the chest. When such a complicated collision that the side collision is followed by the front collision occurs, the inflator is actuated in a dual mode, a lot of gas is supplied from the inflator into the inflation part 22 for protecting the chest, a tear seam at the boundary with an inflation part 24 for protecting a head is broken, and the gas is made to flow from the inflation part 22 for protecting the chest into the inflation part 24 for protecting the head. Since the inflation part 24 for protecting the head is inflated corresponding to the head 14H of an occupant 14, the collision in the vehicle width direction relative to the head 14H of the occupant 14 can be absorbed and the head 14H is protected. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle air belt apparatus having an inflating portion corresponding to a chest and a head of an occupant.

Disclosed is a side-impact-compatible vehicle air belt device in which inflation gas is supplied from an inflator from below a shoulder belt (chest restraining webbing) at the time of a frontal collision and from above the shoulder belt at the time of a side collision. (See Patent Document 1).
Japanese Patent Laid-Open No. 10-226295

  However, in the above-described conventional example, a single bag (inflatable portion) is stored in the occupant restraining webbing, and the manner of inflating the bag is limited.

  In consideration of the above-described facts, an object of the present invention is to provide a vehicle air belt device capable of dealing with a complicated collision such as a side collision after a frontal collision.

  The invention of claim 1 is a front collision sensor for detecting or predicting a frontal collision of a vehicle, a side collision sensor for detecting or predicting a side collision of the vehicle, and an occupant restraining webbing corresponding to the chest of the occupant, A chest protecting inflatable part provided on the occupant restraining webbing and corresponding to the occupant's chest when inflated, and a head protecting inflating part provided on the occupant restraining webbing and corresponding to the occupant's head when inflated An inflator capable of supplying inflation gas to the chest protection inflating part and the head protection inflating part, and the chest protection when a frontal collision of a vehicle is detected or predicted by the front collision sensor. Control means for inflating an inflating portion and operating the inflator to inflate the chest protecting inflating portion when a side collision of the vehicle is detected or predicted by the side collision sensor. It is characterized by a door.

  In the vehicle air belt device according to claim 1, when the front collision of the vehicle is detected or predicted by the front collision sensor, the control means operates the inflator to supply a large amount of gas to the chest protection inflating section. . Thereby, since the expansion part for chest protection expand | swells, it can receive and absorb the inertia force of a passenger | crew's chest, and this chest is protected. In addition, after the vehicle has collided with the front, for example, when the vehicle collides with the pole or the like, or when it is about to collide with the side, the side collision is detected or predicted by the side collision sensor. Activates the inflator to supply a large amount of gas to the head protection inflating section. Thereby, since the expansion part for head protection expand | swells, it can receive and absorb the inertia force of the vehicle width direction of a passenger | crew's head, and this head is protected.

  Therefore, in the vehicle air belt device according to the first aspect, it is possible to cope with not only a frontal collision or a side collision alone but also a complicated collision such as a side collision after a frontal collision. is there.

  According to a second aspect of the present invention, in the vehicular airbelt device according to the first aspect, the head protecting inflating portion is provided above the chest protecting inflating portion independently of the chest protecting inflating portion. It is characterized by being.

  In the vehicle air belt device according to claim 2, since the head protecting inflating portion is provided above the chest protecting inflating portion independently of the chest protecting inflating portion, the head protecting inflating portion is provided. Expands above the inflatable portion for protecting the chest. For this reason, the expansion part for head protection can be developed at a position close to the side of the head of the occupant, and the occupant's head can be widely protected.

  According to a third aspect of the present invention, in the vehicular airbelt device according to the first or second aspect, the inflator is a single inflator, and the chest protection inflating part and the head protecting inflating part It has a valve mechanism capable of selectively supplying gas.

  In the vehicle air belt device according to the third aspect, the single inflator can selectively supply the gas to the chest protecting inflating portion and the head protecting inflating portion by the valve mechanism. For this reason, when a frontal collision of the vehicle occurs alone, only the chest protecting inflating part can be inflated, and when a side collision occurs alone, only the head protecting inflating part can be inflated. .

  In addition, when a side collision occurs continuously following a frontal collision, gas from the inflator is first supplied to the chest protection inflating part by the valve mechanism, and then the gas flow path of the valve mechanism is switched. , And supplied to the head protection inflating portion. Thus, by switching the gas flow path by the valve mechanism, it is possible to cope with multiple collisions such as a side collision after a frontal collision.

  According to a fourth aspect of the present invention, in the vehicular air belt device according to any one of the first to third aspects, the inflator is a dual mode type capable of performing gas supply in two stages. An inflator, wherein the head protecting inflatable portion is provided adjacent to the chest protecting inflating portion, and when the internal pressure of the chest protecting inflating portion exceeds a predetermined internal pressure, the chest protecting inflating portion side A valve portion through which gas is supplied into the head protecting inflating portion is provided at the boundary between the head protecting inflating portion and the chest protecting inflating portion.

  According to a fourth aspect of the present invention, a dual mode inflator capable of supplying gas in two stages is used as the inflator, and the chest protecting inflating part and the head protecting part are adjacent to each other. A valve portion is provided at a boundary portion of the inflating portion so that gas is supplied from the inflating portion for protecting the chest into the inflating portion for protecting the head when the internal pressure of the inflating portion for protecting the chest exceeds a predetermined internal pressure. Therefore, for example, when a frontal collision occurs in the vehicle, the inflator can be operated in a single mode to inflate only the chest protection inflating portion. In addition, when a side collision subsequently occurs in the vehicle, the inflator is operated in a dual mode to increase the internal pressure of the chest protection inflating portion, thereby opening the valve portion to protect the head from the chest protecting inflating portion. Gas can be supplied to the inflating part to inflate the head protecting inflating part. That is, it is possible to cope with multiple collisions with a simple configuration combining a dual mode inflator and a variable volume inflatable portion.

  According to a fifth aspect of the present invention, there is provided a vehicular airbelt device according to the first or second aspect, wherein, as the inflator, a front-impact inflator that supplies gas to the chest protection inflating portion, and the head protection inflating device And a side-impact inflator for supplying gas to the section.

  In the vehicle air belt device according to claim 5, when a frontal collision of the vehicle occurs alone, only the front impact inflator is operated to inflate only the chest protection inflating part, and the side collision occurs independently. In this case, only the side impact inflator can be operated to inflate only the head protection inflating portion.

  In addition, in the case of multiple collisions such as a side collision after a frontal collision, the front impact inflator is activated at the frontal collision to inflate the chest protection inflatable part, and the side impact inflator is subsequently activated at the side collision. Thus, the head protecting inflating portion can be inflated. Since the inflator is independent for the front impact and the side impact, the expansion of each inflatable portion can be controlled at a predetermined timing.

  As described above, according to the air belt device for a vehicle according to claim 1 of the present invention, not only the case where a frontal collision or a side collision occurs alone but also a complicated situation such as a side collision after a frontal collision occurs. It is possible to obtain an excellent effect that it is possible to cope with a serious collision.

  According to the vehicle airbelt device according to claim 2, the head protecting inflatable portion can be deployed at a position close to the side of the occupant's head, and the occupant's head can be widely protected. An excellent effect is obtained.

  According to the vehicle air belt device of the third aspect, by switching the gas flow path by the valve mechanism, it is possible to obtain an excellent effect that it is possible to cope with multiple collisions such as side collision after front collision. .

  According to the vehicle air belt device of the fourth aspect, an excellent effect of being able to cope with multiple collisions can be obtained by a simple configuration combining a dual mode inflator and a variable volume inflating portion.

  According to the vehicle air belt device of the fifth aspect, in the case of multiple collisions, the front impact inflator is operated at the time of a frontal collision to inflate the chest protection inflating part, and then the side collision inflator is activated at the time of a side collision. It can be actuated to inflate the head protecting inflatable part, and since the inflator is independent for the front impact and the side impact, the expansion of each inflatable part can be controlled at a predetermined timing. An excellent effect is obtained.

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

[First Embodiment]
In FIG. 1, a vehicle air belt device 10 according to the first embodiment of the present invention is a kind of seat belt device for restraining an occupant 14 seated on a vehicle seat 12, and includes a front collision sensor 16 and a side. It includes a bump sensor 18, an occupant restraining webbing 21, a chest protecting inflating portion 22, a head protecting inflating portion 24, an inflator 26 (FIG. 4), and an ECU 28 as an example of a control means. Yes.

  The vehicle seat 12 includes a seat cushion 31 having a seat frame (not shown) on which an occupant 14 is seated, a seat back 32 that supports the back of the occupant 14, and a headrest 34 provided on the upper portion of the seat back 32. And is slidable in the vehicle longitudinal direction on a seat rail provided on the floor panel (not shown).

  For example, a wrap outer retractor 36 is mounted on the outer side of the seat cushion 31 and a buckle device (not shown) is pivotally mounted on the inner side of the seat cushion 31 so as to be swingable in the vehicle front-rear direction. . For example, an inflator 26 is disposed in the buckle device.

  The front collision sensor 16 detects or predicts a frontal collision of a vehicle (not shown), for example, an acceleration sensor that detects the frontal collision after the frontal collision, or the possibility of the frontal collision before the frontal collision. A pair of pre-crash sensors for predicting that the height has increased, for example, provided on the left and right of the front end of the vehicle, and connected to the ECU 28 by wires 38, respectively. The ECU 28 can determine a frontal collision of the vehicle by analyzing acceleration data transmitted from each front collision sensor 16 through the wiring 38. As the pre-crash sensor, for example, a millimeter wave radar capable of detecting a distance from an object in front of the vehicle or an ABS device is used.

  The side collision sensor 18 is an acceleration sensor for detecting or predicting a side collision of the vehicle, for example, an acceleration sensor that detects the side collision after the side collision, or that the possibility of the side collision has increased before the side collision. For example, one pre-crash sensor to be predicted is provided on each side (B pillar or side door) of the vehicle and connected to the ECU 28 by a wiring 40. The ECU 28 can determine the side collision of the vehicle by analyzing the acceleration data transmitted from the side collision sensor 18 through the wiring 40. Here, as the pre-crash sensor, for example, a millimeter wave radar capable of detecting a distance from an object on the side of the vehicle or a spin prevention device is used.

  The occupant restraining webbing 21 is a belt-like member corresponding to the chest 14B of the occupant 14, and is configured to be wound around, for example, a retractor 42 provided on an upper back panel (not shown) of the vehicle body. Sometimes, the occupant restraining webbing 21 can be pulled out of the retractor 42 according to the physique of the occupant 14. A tongue plate 44 that can be fitted to the buckle device is provided at the tip of the passenger restraining webbing 21. Between the tongue plate 44 and the lap outer retractor 36, a lap belt 46 corresponding to the waist 14W of the occupant 14 is provided.

  The lap belt 46 and the occupant restraining webbing 21 may be configured as one webbing so that the tongue plate 44 can be moved in accordance with the physique of the occupant 14. In this case, since the length of the lap belt 46 can be adjusted by adjusting the amount of withdrawal from the retractor 42, an anchor (not shown) is provided in place of the wrap outer retractor 36, and the end of the lap belt 46 is fixed to the anchor. May be.

  The chest protection inflatable portion 22 is provided on the occupant restraining webbing 21 and is a bag corresponding to the chest 14B of the occupant 14 when inflated, and is folded so as to have the same width as the occupant restraint webbing 21 during normal use. At the same time, it is sewn at a position corresponding to the chest 14B of the occupant 14 in the occupant restraining webbing 21 by using a control sewing, that is, a so-called tear seam (not shown) that breaks when an internal pressure equal to or higher than a predetermined internal pressure is applied. As shown in FIG. 2, when gas is supplied from the inflator in the buckle device through the tongue plate 44 when the vehicle collides with the front, the tear seam breaks and expands from the folded state to the bag state. ing. Note that the chest protection inflating portion 22 may be connected to the end of the passenger restraining webbing 21. That is, a portion of the occupant restraining webbing 21 corresponding to the chest 14B of the occupant 14 may be replaced with the chest protection inflating portion 22.

  The head protecting inflatable portion 24 is provided on the occupant restraining webbing 21 and is a bag body corresponding to the head 14H of the occupant 14 when inflated. Is sewed at a position corresponding to the head 14H of the occupant 14 in the occupant restraining webbing 21 together with the chest protection inflating portion 22 using a tear seam (not shown) that is broken when an internal pressure higher than a predetermined internal pressure is applied. Has been.

  In addition, the head protecting inflatable portion 24 is provided adjacent to and above the chest protecting inflating portion 22 independently of the chest protecting inflating portion 22, and as shown in FIG. At the boundary between the protective inflating portion 24 and the chest protecting inflating portion 22, when the internal pressure of the chest protecting inflating portion 22 exceeds a predetermined internal pressure, the head protecting inflating portion 22 is provided from the chest protecting inflating portion 22 side. A valve part for supplying gas into the part 24 is provided.

  The valve portion is a so-called tear seam 48 that breaks when, for example, a certain force is applied. In FIG. 1, in FIG. When the gas is supplied to the portion 22 and the internal pressure of the chest protecting inflatable portion 22 reaches a predetermined internal pressure or more, the tear seam 48 is broken as shown in FIG. Gas flows into the head protecting inflating part 24 from the head 22 so that the head protecting inflating part 24 is inflated.

  That is, the chest protecting inflatable part 22 and the head protecting inflating part 24 are configured as a variable volume type bag, and the boundary between the chest protecting inflating part 22 and the head protecting inflating part 24 is It is sewn and partitioned by a tear seam 48 that breaks when the pressure in the chest protecting inflatable portion 22 exceeds a certain level.

  As shown in FIG. 5A, as the valve portion provided at the boundary between the chest protecting inflatable portion 22 and the head protecting inflating portion 24, the pressure in the chest protecting inflating portion 22 exceeds a certain level. You may make it provide the tear slit 50 opened when it becomes.

  Further, when the occupant restraining webbing 21 is mounted or when the head protecting inflatable part 24 is deployed, the occupant restraining webbing is inflated at a position corresponding to the head 14H of the occupant 14. The amount of withdrawal 21 may be controlled by the retractor 42. Specifically, for example, the occupant restraining webbing 21 is moved by rotating the spool (not shown) of the retractor 42 in the winding direction or the drawing direction by a motor (not shown), thereby protecting the head. You may make it move the position of the expansion part 24 for an object to the position corresponding to the head 14H of the passenger | crew 14. FIG. It is desirable that the head protecting inflating portion 24 is widely deployed so as to correspond to the neck 14N from the head 14H of the occupant 14.

  The retractor 42 is a winding device for adjusting the length of the occupant restraining webbing 21, and as shown in FIG. 1, for example, an upper back panel (not shown) in the vehicle body behind the seat back 32. Is provided. The position where the retractor 42 is provided is not limited to this, and may be, for example, the back surface of the seat back 32 or the inside of the seat back 32.

  The retractor 42 can wind up the occupant restraint webbing 21 within a predetermined range when the vehicle air belt device 10 is not mounted, and can pull out the occupant restraint webbing 21 appropriately when the vehicle air belt device 10 is mounted. In addition, when the occupant 14 is seated on the vehicle seat 12 and the vehicle air belt device 10 is mounted, or when the head protecting inflating portion 24 is deployed, the head protecting inflating portion 24 is attached to the occupant 14. The pull-out amount of the occupant restraining webbing 21 can be controlled so as to be positioned on the side of the head 14H.

  In FIG. 4, an inflator 26 is a dual mode inflator capable of instantaneously injecting inflation gas to the chest protection inflating portion 22 and the head protection inflating portion 24 with two stages of pressure, such as a buckle device. The gas can be supplied into the inflating portion 22 for protecting the chest through a tongue plate 44 (FIG. 1) disposed in the buckle device.

  In FIG. 1, the ECU 28 inflates the chest protection inflating portion 22 when a front collision of the vehicle is detected or predicted by the front collision sensor 16, and subsequently, a side collision of the vehicle is detected or detected by the side collision sensor 18. A control unit that operates the inflator 26 so as to inflate the head protecting inflating portion 24 when predicted, and includes a pair of front-projection sensors 16 by wires 38 and a side-projection sensor 18 by wires 40. It is connected. Moreover, ECU28 is connected using the wire harness 52 (FIG. 4, 5) so that an ignition current can be sent with respect to the inflator 26, for example.

  4 and 5, the inflator 26 is depicted as being directly connected to the chest protection inflating portion 22, but this is a schematic view, and actually, as shown in FIG. 1. A buckle device and a tongue plate 44 are interposed between the inflator and the chest protecting inflating portion 22.

(Function)
The vehicle air belt device 10 is configured as described above, and the operation thereof will be described next. In this operation, the detection of the frontal collision includes the prediction of the frontal collision, and the detection of the side collision includes the prediction of the side collision. In FIG. 1 and FIG. 4, in the vehicle air belt device 10, when the front collision of the vehicle occurs and the ECU 28 detects the front collision by a signal from the front collision sensor 16, the ECU 28 ignites the inflator 26 through the wire harness 52. A current flows. Then, the inflator 26 operates in a single mode, and as shown in FIG. 4 (A), an amount of gas that can sufficiently inflate the chest protection inflating portion 22 causes the buckle device and the tongue plate 44 (see FIG. 1) is supplied in the direction of arrow A into the inflating portion 22 for protecting the chest. As a result, as shown in FIG. 2, the chest protecting inflatable portion 22 is inflated corresponding to the chest 14B of the occupant 14, so that the shock to the chest 14B of the occupant 14 can be absorbed, and the chest 14B is protected. Is done. At this stage, the operation of the inflator 26 is in a single mode, and the internal pressure of the chest protecting inflatable portion 22 is sufficient to break the tear seam 48 (FIG. 4) at the boundary with the head protecting inflating portion 24. Is not growing.

  Next, after the frontal collision of the vehicle as described above, for example, the vehicle spins to cause a secondary side collision from the occupant seating side, and when the ECU 28 detects the side collision by a signal from the side collision sensor 18, the ECU 28 As a result, as shown in FIG. 4B, a further ignition current is caused to flow to the inflator 26 through the wire harness 52. Then, the inflator 26 operates in a dual mode, and a large amount of gas is supplied from the inflator 26 through the buckle device and the tongue plate 44 (FIG. 1) into the chest protection inflating portion 22, and the internal pressure of the chest protection inflating portion 22 is supplied. Exceeds a predetermined internal pressure, and the tear seam 48 at the boundary with the head protecting inflating part 24 is broken to form a gas flow path 70, through which the chest protecting inflating part 22 passes through the gas protecting path 22. A gas flows in the direction of arrow B into the inflatable portion 24. As a result, as shown in FIG. 3, the head protecting inflating portion 24 inflates upward from the vicinity of the shoulder portion of the occupant 14 corresponding to the head portion 14H. The head 14H is protected. At this time, the head protecting inflating portion 24 is lifted upward by the chest protecting inflating portion 22 that has been inflated first.

  On the other hand, as shown in FIG. 5A, when a tear slit 50 is provided at the boundary between the chest protecting inflatable portion 22 and the head protecting inflating portion 24, the single inflator 26 at the time of a frontal collision is provided. During operation in the mode, gas is supplied from the inflator 26 in the direction of arrow A, and only the chest protection inflating portion 22 is inflated. Further, when the inflator 26 is operated in the dual mode at the time of a side collision following a frontal collision, as shown in FIG. 5B, gas is further supplied from the inflator 26 to the chest protection inflating part 22, thereby When the internal pressure of the protective inflating part 22 rises to a predetermined internal pressure or higher, the tear slit 50 is opened to form the gas flow path 70, and the head protective inflating part is formed from the chest protective inflating part 22 through the gas flow path 70. The gas flows in the direction of arrow B into the head 24, and the head protecting inflating portion 24 inflates.

  When the vehicle collides sideways without a frontal collision, the ECU 28 operates the inflator 26 at the maximum output, breaks the tear seam 48 or opens the tear slit 50, and expands the chest protection inflating part 22 and head protection. It is possible to protect the head 14H of the occupant 14 by inflating the inflating part 24 at the same time.

  As described above, the vehicular airbelt device 10 can cope with not only a frontal collision or a side collision alone but also a multiple collision such as a side collision after a frontal collision. Further, since the head protecting inflating portion 24 is provided above the chest protecting inflating portion 22 independently of the chest protecting inflating portion 22, the head protecting inflating portion 24 is the chest protecting inflating portion. 22 expands above. For this reason, the expansion part 24 for head protection can be expand | deployed to the position close | similar to the side of the head 14H of the passenger | crew 14, and it can protect widely from the head 14H of the passenger | crew 14 to the neck part 14N.

  Furthermore, a simple configuration combining the dual-mode type inflator 26 and the variable volume inflating section, that is, the chest protecting inflating section 22 and the head protecting inflating section 24 can cope with multiple collisions.

[Second Embodiment]
In FIG. 6, in the vehicle air belt device 20 according to the first embodiment of the present invention, an inflator 26 that is a gas supply source for inflating the chest protecting inflating portion 22 and the head protecting inflating portion 24 includes a single inflator 26. This is an inflator, and has a valve mechanism 54 that can selectively supply gas to the chest protecting inflatable part 22 and the head protecting inflating part 24.

  As shown in FIG. 7, in the valve mechanism 54, a piston 58 and a valve 60 are connected to both ends of the piston rod 56, the piston 58 is disposed in the first cylinder 61, and the valve 60 is coaxial with the first cylinder 61. It arrange | positions in the 2nd cylinder 62 provided in the shape. The first cylinder 61 and the second cylinder 62 are, for example, cylinders having the same inner diameter divided into partition walls 64, and both ends 61B and 62B are closed. In the first cylinder 61, an inflator attachment portion 61A is provided between the piston 58 and the partition wall 64 in the initial state shown in FIG. 7, and a small inflator 66 is attached to the inflator attachment portion 61A. The small inflator 66 is electrically connected to the ECU 28 shown in FIG.

  As shown in FIG. 6, the second cylinder 62 includes a gas flow path 72 connected to the chest protection inflating portion 22 and a gas flow path 74 connected to the head protecting inflating portion 24. For example, a dual mode inflator 26 is provided in the inflator mounting portion 62A at an intermediate position between the gas flow path 72 and the gas flow path 74. It is attached. The attachment position of the inflator 26 in the second cylinder 62 is, for example, on the opposite side of the gas flow path 72 and the gas flow path 74 in consideration of the gas flow.

  The partition wall 64 is provided between the inflator attachment portion 61 </ b> A serving as the boundary between the first cylinder 61 and the second cylinder 62 and the gas flow path 74, and the piston rod 56 is inserted therethrough. A packing (not shown), for example, is provided between the partition wall 64 and the piston rod 56, and the airtightness between the first cylinder 61 and the second cylinder 62 is maintained by the packing.

  In the valve mechanism 54, in the initial state shown in FIG. 7, the valve 60 is in a position to close the gas flow path 74, and the gas flow path 72 is opened. The piston 58 is located on the partition wall 64 side in the first cylinder 61.

  In FIGS. 6 and 7, the valve mechanism 54 is depicted as being directly connected to the chest protecting inflatable portion 22 and the head protecting inflating portion 24. As shown in FIG. 1, a buckle device and a tongue plate 44 are interposed between the inflator and the chest protecting inflating portion 22 and the head protecting inflating portion 24.

  Since other parts are the same as those shown in FIGS. 1 to 3 in the first embodiment, the same parts are denoted by the same reference numerals and description thereof will be omitted.

(Function)
The vehicle air belt device 20 is configured as described above, and the operation thereof will be described next. In this operation, the detection of the frontal collision includes the prediction of the frontal collision, and the detection of the side collision includes the prediction of the side collision. In FIG. 1, in the vehicle air belt device 20, when the vehicle collides with the front and the ECU 28 detects the front collision by the signal from the front collision sensor 16, the ECU 28 detects the front collision as shown in FIG. An ignition current is supplied to the inflator 26 through the wire harness 52. Then, the inflator 26 operates in a single mode, and gas is supplied in the direction of arrow A into the chest protection inflating portion 22 through the buckle device and the tongue plate 44 (FIG. 1).

  At this time, as shown in FIG. 7, the gas flow path 72 connected to the breast protection inflating portion 22 is opened in the initial state, and the gas from the inflator 26 passes through the second cylinder 62. Then, the gas flows in the direction of arrow A toward the chest protection inflating portion 22 through the gas flow path 72, the buckle device, and the tongue plate 44 (FIG. 1).

  As a result, as shown in FIG. 2, the chest protecting inflatable portion 22 is inflated corresponding to the chest 14B of the occupant 14, so that the shock to the chest 14B of the occupant 14 can be absorbed, and the chest 14B is protected. Is done.

  Next, after the frontal collision of the vehicle as described above, for example, the vehicle spins to cause a secondary side collision from the occupant seating side, and when the ECU 28 detects the side collision by a signal from the side collision sensor 18, The ECU 28 first causes an ignition current to flow through the wire harness 68 to the small inflator 66. Then, as shown in FIG. 8, the small inflator 66 is operated, and gas is supplied from the small inflator 66 into the first cylinder 61, specifically, between the piston 58 and the partition wall 64, and the piston is driven by the pressure. 58 slides in the first cylinder 61 and is pulled by the piston rod 56 connected to the piston 58, so that the valve 60 moves to a position to close the gas flow path 72, thereby the head protecting expansion portion. The gas flow path 74 to 24 is opened. That is, the position of the valve 60 is instantaneously switched by the gas pressure from the small inflator 66.

  Subsequently, as shown in FIG. 6B, when the ECU 28 causes a further ignition current to flow through the wire harness 52 to the inflator 26, the inflator 26 operates in the dual mode, and the buckle device and the tongue plate 44 (see FIG. 6B). Gas is supplied in the direction of arrow B into the head protecting inflatable part 24 through 1).

  At this time, as shown in FIG. 8, the gas flow path 74 connected to the head protecting inflating portion 24 is opened by switching the position of the valve 60 as described above, and the gas from the inflator 26 is opened. Passes through the second cylinder 62 and flows in the direction of arrow B toward the inflating portion 22 for protecting the chest through the gas flow path 74, the buckle device and the tongue plate 44 (FIG. 1). About the expansion part 22 for breast protection which has already expanded, the gas flow path 72 is interrupted | blocked by the valve 60, and the expansion | swelling state is maintained.

  In this way, as shown in FIG. 3, the head protecting inflating portion 24 inflates corresponding to the head 14H of the occupant 14, so that the impact in the vehicle width direction on the head 14H of the occupant 14 is absorbed. The head 14H is protected.

  When the vehicle has a side collision without a frontal collision, the ECU 28 operates the valve mechanism 54 to open the gas flow path 74 and then operates the inflator 26 to inflate only the head protecting expansion portion 24. By doing so, it is possible to protect the head 14H of the occupant 14.

  As described above, in the vehicle air belt device 20, the single inflator 26 can selectively supply the gas to the chest protecting inflatable part 22 and the head protecting inflating part 24 by the valve mechanism 54. For this reason, when a frontal collision of the vehicle occurs alone, only the chest protecting inflating part 22 is inflated, and when a side collision occurs alone, only the head protecting inflating part 24 is inflated. Can do.

  In the case of multiple collisions in which side collisions occur continuously following a frontal collision, the gas from the inflator 26 is first supplied to the chest protection inflating part 22 by the valve mechanism 54, and then the gas of the valve mechanism 54 The flow path 72 is switched to the gas flow path 74 and supplied to the head protecting inflating section 24. In this way, by switching the gas flow paths 72 and 74 by the valve mechanism 54, it is possible to cope with multiple collisions such as a side collision after a frontal collision.

[Third Embodiment]
In FIG. 9, in the vehicle air belt device 30 according to the third embodiment of the present invention, the front-impact inflator 76 that supplies gas to the chest protection inflating portion 22 and the gas to the head protection inflating portion 24 are supplied. And a side-impact inflator 78. The front impact inflator 76 is connected to the ECU 28 (FIG. 1) by a wire harness 80, and the side impact inflator 78 is connected to the ECU 28 by a wire harness 82.

  In FIG. 9, the front impact inflator 76 is depicted as being directly connected to the chest protecting inflatable portion 22, and the side impact inflator 78 is depicted as being directly connected to the head protecting inflatable portion 24. As shown in FIG. 1, a buckle device and a tongue plate 44 are interposed between the inflator, the chest protecting inflating portion 22 and the head protecting inflating portion 24. Yes.

  Since other parts are the same as those shown in FIGS. 1 to 3 in the first embodiment, the same parts are denoted by the same reference numerals and description thereof will be omitted.

(Function)
The vehicle air belt device 30 is configured as described above, and the operation thereof will be described next. In this operation, the detection of the frontal collision includes the prediction of the frontal collision, and the detection of the side collision includes the prediction of the side collision. In FIG. 1, in the vehicle air belt device 30, when the front collision of the vehicle occurs and the ECU 28 detects the front collision based on a signal from the front collision sensor 16, as shown in FIG. 9, the wire harness An ignition current is supplied to the front impact inflator 76 through 80. Then, the front inflator 76 is activated, and gas is supplied in the direction of arrow A into the chest protecting inflatable portion 22 through the buckle device and the tongue plate 44 (FIG. 1).

  As a result, as shown in FIG. 2, the chest protecting inflatable portion 22 is inflated corresponding to the chest 14B of the occupant 14, so that the shock to the chest 14B of the occupant 14 can be absorbed, and the chest 14B is protected. Is done.

  Next, after the frontal collision of the vehicle as described above, for example, the vehicle spins to cause a secondary side collision from the occupant seating side, and when the ECU 28 detects the side collision by a signal from the side collision sensor 18, The ECU 28 causes an ignition current to flow to the side collision inflator 78 through the wire harness 82. Then, the side impact inflator 78 is activated, and gas is supplied in the direction of arrow B into the head protecting inflating portion 24 through the buckle device and the tongue plate 44 (FIG. 1).

  As a result, as shown in FIG. 3, the head protecting inflating portion 24 is inflated corresponding to the head 14H of the occupant 14, so that the impact in the vehicle width direction on the head 14H of the occupant 14 can be absorbed. And the head 14H is protected.

  When the vehicle has a side collision without a frontal collision, only the side collision inflator 78 can be operated by the ECU 28, and only the head protecting inflating part 24 can be inflated.

  As described above, in the vehicular airbelt device 30, when a frontal collision of the vehicle occurs alone, only the front impact inflator is operated to inflate only the chest protection inflating part, and the side collision occurs independently. In this case, only the side impact inflator can be operated to inflate only the head protection inflating portion.

  Also, in the case of multiple collisions such as a side collision after a frontal collision, the front impact inflator 76 is activated during a frontal collision to inflate the chest protection inflating part 22, and subsequently a side impact inflator 78 during a side collision. Can be operated to expand the head protecting inflating portion 24. Since the inflator is independent for the front impact and the side impact, the expansion of each inflatable portion can be controlled at a predetermined timing.

  Further, even in the case of multiple collisions such as a frontal collision after a side collision, the side impact inflator 78 is actuated to cause the head protection inflating portion 24 to expand at the side collision, and subsequently to the front collision at the frontal collision. The head 14H and the chest 14B of the occupant 14 can be protected by operating the inflator 76 to inflate the chest protection inflating portion 22.

  In each of the above-described embodiments, the structure in which the chest protection inflating portion 22 and the head protection inflating portion 24 are attached to the occupant restraining webbing 21 has been described. It is good also as a structure which comprises the expansion part 22 for protection and the expansion part 24 for head protection, and this expansion part 22 for chest protection and the expansion part 24 for head protection have a role as the webbing 21 for passenger | crew restraint.

  Further, the head protecting inflatable portion 24 may be arranged in the longitudinal direction of the occupant restraining webbing 21 so that the attachment position can be adjusted.

FIG. 1 to FIG. 5 relate to the first embodiment, and FIG. 1 is a perspective view showing a state in which an occupant is seated on a vehicle seat provided with a vehicle air belt device and an occupant restraining webbing is mounted. FIG. 6 is a perspective view showing a state in which an inflating portion for chest protection is inflated in a state where an occupant is seated on the vehicle seat and the occupant restraining webbing is mounted. FIG. 3 is a perspective view showing a state in which the head protecting inflating portion is inflated following the state of FIG. 2. (A) It is a front view which shows typically the state which the expansion part for chest protection expanded by the gas supplied from a dual mode type inflator. (B) The gas supplied from the dual mode inflator increases the internal pressure of the chest protection inflating portion, thereby tearing the tear seam and supplying the gas from the chest protecting inflating portion to the head protecting inflating portion, It is a front view which shows typically the state which this expansion part for head protection expanded. (A) is a front view schematically showing a state where an inflating portion for chest protection is inflated by gas supplied from a dual mode inflator. In (B), the gas supplied from the dual mode inflator increases the internal pressure of the chest protection inflating portion, whereby the tear slit opens and gas flows from the chest protection inflating portion to the head protecting inflating portion. It is a front view which shows typically the state which the supplied expansion part for this head protection expanded. FIGS. 6 to 8 relate to the second embodiment, and FIG. 6 (A) shows the chest protection by the gas from the inflator among the chest protection inflating part and the head protecting inflating part connected to the valve mechanism. It is a front view which shows the state which the expansion part expanded. FIG. 6B is a front view showing a state where the gas flow path is switched in the valve mechanism and the head protecting inflating portion is inflated by the gas from the inflator. In the valve mechanism, the valve closes the gas flow path to the head protecting inflatable part, and opens the gas flow path to the chest protecting inflating part, from the inflator to the chest protecting inflating part through the gas channel. It is sectional drawing which shows the state through which gas flows. In the valve mechanism, the valve is switched to close the gas flow path to the chest protection inflating section and to open the gas flow path to the head protecting inflating section. It is sectional drawing which shows the state in which gas flows toward an expansion | swelling part. (A) is a front view schematically showing a state in which an inflating part for chest protection is inflated by a gas supplied from an inflator according to the third embodiment. (B) is a front view which shows the state which the expansion part for head protection expanded by the gas supplied from an inflator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle air belt apparatus 12 Vehicle seat 14 Crew 14B Chest 14H Head 16 Front collision sensor 18 Side collision sensor 20 Vehicle air belt apparatus 21 Crew restraint webbing 22 Chest protection expansion section 24 Head protection expansion section 26 Inflator 28 ECU (control means)
30 Air belt device for vehicles 48 Tear seam (valve part)
50 Tear slit (valve part)
54 Valve mechanism 76 Front impact inflator 78 Side impact inflator

Claims (5)

A front collision sensor for detecting or predicting a frontal collision of the vehicle;
A side collision sensor for detecting or predicting a side collision of the vehicle;
An occupant restraining webbing corresponding to the chest of the occupant;
A chest protecting inflatable portion provided on the occupant restraining webbing and corresponding to the chest of the occupant when inflated;
An inflatable portion for protecting the head corresponding to the occupant's head when inflated, provided on the occupant restraining webbing;
An inflator capable of supplying inflation gas to the chest protection inflation portion and the head protection inflation portion;
The inflating portion for protecting the chest is inflated when a frontal collision of the vehicle is detected or predicted by the front collision sensor, and the chest protection is performed when a side collision of the vehicle is detected or predicted by the side collision sensor. Control means for actuating the inflator so as to inflate the inflatable part for use;
A vehicular airbelt device comprising:   The vehicular airbelt device according to claim 1, wherein the head protecting inflatable portion is provided above the chest protecting inflating portion independently of the chest protecting inflating portion.   The said inflator is a single inflator, and has a valve mechanism capable of selectively supplying gas to the chest protection inflating part and the head protecting inflating part. The vehicle air belt device according to 2. The inflator is a dual mode inflator capable of performing gas supply in two stages,
The head protecting inflatable portion is provided adjacent to the chest protecting inflating portion, and when the internal pressure of the chest protecting inflating portion exceeds a predetermined internal pressure, the head protecting inflating portion from the chest protecting inflating portion side 4. The valve portion for supplying gas into the protective inflating portion is provided at a boundary portion between the head protecting inflating portion and the chest protecting inflating portion. The vehicle air belt device according to claim 1.   The inflator for a front collision for supplying gas to the inflatable part for chest protection and the inflator for side collision for supplying gas to the inflatable part for head protection are provided as the inflator. Item 3. The vehicle air belt device according to Item 2.

Images