JP5007705B2 - Air belt and air belt device - Google Patents

Description

  The present invention relates to an inflatable belt including an inflatable bag that restrains an occupant sitting on a vehicle seat, and more particularly to an inflatable belt having a vent hole for letting gas out from the inflated bag. The present invention also relates to an air belt device provided with the air belt.

  An air belt device for restraining an occupant sitting on a vehicle seat by an air belt having an inflatable bag is well known.

  Japanese Patent Application Laid-Open No. 11-180241 describes an air belt device in which a part of a shoulder belt that is hung around the upper body of an occupant seated on a seat is constituted by an inflatable bag. The bag extends from the side of the passenger's head to the front side of the upper body. At the time of a vehicle side collision, a portion of the inflated bag located on the side of the head receives the head and restrains the lateral movement of the head.

The bag is provided with a vent hole for allowing gas to flow out of the inflated bag to the outside of the bag. When the inflated bag receives the occupant, gas flows out of the bag from the vent hole, so that the occupant is softly received by the bag.
JP-A-11-180241

  In an emergency such as a vehicle collision, it is desirable that the bag be inflated quickly.

  When the bag catches the upper body of the occupant in the event of a frontal collision of the vehicle, in order to prevent an excessive load from being applied to the internal organs of the occupant, gas quickly flows out of the bag from the vent hole and the internal pressure of the bag decreases. It is desirable to do.

  Further, at the time of a vehicle side collision or rollover, in order to prevent the passenger's head from coming into contact with the passenger compartment side surface or the like for a long period of time, it is desirable that the bag is maintained at a high internal pressure for a long period of time after inflating.

  However, if the bag is provided with a vent hole, the gas flows out of the bag from the vent hole even during the expansion of the bag, so that the expansion of the bag is delayed accordingly. Also, when the inflated bag receives the upper body of the occupant at the time of the vehicle front collision, the gas quickly flows out of the bag from the vent hole and the bag internal pressure decreases, but at the time of vehicle side collision or rollover, As described in paragraph [0020] of JP-A-11-180241, it is difficult to keep the internal pressure of the inflated bag high for a long period of time.

  In the present invention, the bag quickly inflates in the event of an emergency such as a vehicle collision, and at the time of a vehicle front collision, when the inflated bag receives the upper body of an occupant, gas quickly flows out of the bag from the vent hole, and An object of the present invention is to provide an inflatable belt and an inflatable belt device in which the internal pressure of the inflated bag is kept high for a long time at the time of a vehicle side collision and rollover.

  The air belt of the present invention (Claim 1) includes at least an inflatable bag disposed from the side of the head of the occupant to the front side of the chest, and gas in the bag provided in the bag. In the air belt provided with a vent hole for flowing out into the air belt, the air belt further closes or opens the vent hole until the bag is pressed by an occupant in a state where the bag is inflated, In the event of a vehicle forward collision, the vent hole is opened or opened to a large degree when the inflated bag is pressed by an occupant, and in the event of a vehicle side collision or rollover, the vent hole is closed or left at a small degree of opening. A restriction member is provided.

  According to a second aspect of the present invention, there is provided an air belt according to the first aspect, wherein the bag is in an inflated state, a chest-facing surface that faces the front surface of the chest of the occupant, an anti-thoracic side surface opposite to the chest-facing surface, and the occupant's head. A head-facing surface facing the side surface of the part and an opposite-head-side surface opposite to the head-facing surface, and the gas outflow regulating member faces the chest when the bag is inflated When the surface is pressed from the occupant's chest, the vent hole is opened or opened to a large degree, and when the head facing surface is pressed from the occupant's head, the vent hole is closed or left at a small opening degree. It is characterized by being comprised.

  The air belt of claim 3 is the air belt according to claim 2, wherein the vent hole is disposed on a side surface of the chest opposite to the bag, and the gas outflow regulating member includes a lid that covers the vent hole, and the bag. And a tether that connects the lid and the chest-facing surface, and when the bag is inflated, the tether is tensioned between the lid and the chest-facing surface, thereby When the lid is prevented from separating from the vent hole, the vent hole is closed or opened by the lid, and the chest facing surface of the inflated bag is pressed from the chest of an occupant, the The tether relaxes, whereby the lid is separated from the vent hole by the gas pressure in the bag, thereby opening the vent hole or opening the large opening, and the head-facing surface of the inflated bag is From the head of the crew When pressurized, said tether does not relax, thereby, the vent hole is closed or is characterized in that is left of the small opening.

  The air belt according to claim 4 is the air belt according to claim 3, wherein the lid extends across the vent hole, at least one end side of the lid extending in the extending direction is coupled to the bag, and the other end side is the bag. The tether insertion part is provided in the one end side of the lid body from the vent hole on the inner side surface of the bag on the side opposite to the chest, and the tether has one end on the lid. It is characterized in that it is connected to the one end side of the body, the middle part is inserted into the tether insertion part, and the other end is connected to the chest-opposing surface.

  The air belt of claim 5 is the air belt according to claim 2, wherein the vent hole is disposed on a side surface of the anti-chest portion of the bag, and the gas outflow restricting member is disposed in the bag, and the vent of the side surface of the anti-chest portion is provided. A tether that connects the vicinity of the hole and the chest-facing surface, and when the bag is inflated, the vicinity of the vent hole is pulled into the bag by the tether so that the vent hole is closed or When the chest facing surface of the inflated bag is pressed from the occupant's chest, the tether is relaxed, and thereby the bag is exposed so that the vent hole is exposed to the outer surface of the bag. When the vent hole is opened or opened to a large extent and the head-facing surface of the inflated bag is pressed from the head of an occupant, the tether does not relax, The Le, the vent hole is closed or is characterized in that is left of the small opening.

  The air belt of claim 6 is the air belt according to claim 5, wherein two vent holes are arranged close to the side surface of the anti-chest portion, and one end of the tether is located between the vent holes on the side surface of the anti-chest portion. It is characterized by being connected to the part of.

  An inflatable belt device of the present invention (invention 7) comprises the inflatable belt according to any one of claims 1 to 6 and an inflator for inflating the bag of the inflatable belt.

  In the air belt of the present invention (Claim 1) and the air belt apparatus of the present invention (Claim 7), the vent hole is closed or closed by the gas outflow regulating member until the bag is pressed by the occupant when the bag is inflated. Since the opening is small and gas outflow from the vent hole is restricted, the bag quickly expands in an emergency such as a vehicle collision without using a high-power inflator.

  The gas outflow regulating member opens the vent hole or opens the large opening when the inflated bag is pressed by the occupant at the time of a vehicle front collision. Thus, when the inflated bag receives the upper body of the occupant, gas flows out of the bag from the vent hole and the upper body of the occupant is softly received.

  Further, the gas outflow regulating member closes the vent hole or keeps the small opening degree at the time of vehicle side collision and rollover. Thereby, since the internal pressure of the inflated bag is maintained high for a long time, it is possible to prevent the occupant's head from coming into contact with the side surface of the passenger compartment or the like for a long time.

  At the time of a vehicle front collision, the upper body of the occupant moves forward, so that the chest facing surface of the inflated bag is mainly pressed from the occupant's chest. Further, at the time of vehicle side collision and rollover, the upper body of the occupant moves so as to fall sideways, so that the head-facing surface of the inflated bag is mainly pressed from the occupant's head.

  According to a second aspect of the present invention, the gas outflow regulating member opens the vent hole or opens a large opening when the chest facing surface of the bag is pressed from the chest of the occupant when the bag is inflated, and the head facing surface of the bag When the vehicle is pressed from the occupant's head, the vent hole is closed or left at a small opening, so that in the event of a frontal collision of the vehicle, the vent hole is opened or opened largely when the bag receives the occupant's chest. At the time of vehicle side collision and rollover, the vent hole is closed or left small even if the bag receives the head of the passenger.

  According to the third aspect of the present invention, when the bag is inflated, the chest facing surface and the opposite chest side surface of the bag are separated as the bag is inflated, so that the tether is tensioned between the lid and the chest facing surface. As a result, separation of the lid from the vent hole is prevented, and the vent hole is closed or has a small opening. As a result, gas outflow from the vent hole is restricted, and the bag is quickly inflated.

  In the event of a vehicle front collision, the chest facing surface of the inflated bag is pressed from the chest of the occupant so that the chest facing surface moves back into the bag, so that the tether relaxes and the lid can move to the outside of the bag. The lid is pushed out of the bag from the vent hole by the gas pressure in the bag, and the vent hole is opened or has a large opening. As a result, gas flows out of the bag from the vent hole, and the occupant can be softly received.

  At the time of vehicle side collision and rollover, the head facing surface of the inflated bag is pushed from the head of the passenger and retracts into the bag, but the chest facing surface does not retract into the bag, so the tether does not relax and the lid The body remains over the vent hole. Therefore, the vent hole is closed or kept at a small opening, and the bag internal pressure is maintained high for a long period.

  According to the aspect of the fourth aspect, when the bag is inflated, the lid body is pulled by the tether and is tensioned along the side opposite to the chest of the bag. Therefore, the closure of the vent hole by this lid body is good.

  According to the fifth aspect of the present invention, when the bag is inflated, the chest facing surface and the opposite chest side surface of the bag are separated from each other as the bag is inflated, so that the vicinity of the vent hole is drawn into the bag through the tether. The vent hole is not exposed on the outer surface of the bag. As a result, the outflow of gas from the vent hole to the outside of the bag is restricted, and the bag is quickly inflated.

  At the time of a vehicle front collision, the chest facing surface of the inflated bag is pressed from the chest of the occupant, so that the chest facing surface moves back into the bag, so that the tether relaxes and the vicinity of the vent hole appears on the bag outer surface. The bag is full. As a result, the gas in the bag flows out of the bag through the vent hole, and the upper body of the occupant is softly received by the bag.

  At the time of vehicle side collision and rollover, the head facing surface of the inflated bag is pushed from the head of the occupant and retracts into the bag, but the chest facing surface does not retract into the bag, so the tether does not relax, vent The hole is not exposed on the outside of the bag. Therefore, the outflow of gas from the vent hole to the outside of the bag remains regulated, and the bag internal pressure is maintained high for a long time.

  In the aspect of the sixth aspect, since the vicinity of the two vent holes can be drawn into the bag by a common tether, even when two vent holes are provided, an increase in the construction cost of the air belt is suppressed. be able to.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 is a perspective view of an inflatable belt apparatus including an inflatable belt according to an embodiment, FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1, and FIG. FIG. 4 is a cross-sectional view of the same portion as FIG. 2 showing a state where the head-facing surface of the inflated bag is pressed by the passenger's head. is there.

  In the following description, the front-rear direction and the left-right direction refer to the front-rear direction and the left-right direction for the occupant seated on the seat on which the air belt device is installed.

  The inflatable belt device is passed through an upper part of one shoulder of an occupant sitting on a vehicle seat and is obliquely routed (in this embodiment, from upper left to lower right) on the front side of the upper body of the occupant. A shoulder belt 10 having a possible bag 20, an inflator (gas generator) 30 for inflating the bag 20, and an outflow of gas from the bag 20 provided outside the bag 20 to the outside of the bag 20. Vent hole 21, gas outflow regulating member 40 that regulates gas outflow from vent hole 21, lap belt 11 that is routed in the left-right direction above the occupant's waist, and the side of the seat ( In this embodiment, the buckle device 12 installed adjacent to the right side), the tongue 13 inserted and locked to the buckle device 12 when the belt is worn, and the shoulder belt 10 are guided. It has a shoulder anchor 14 and the like that.

  In this embodiment, the shoulder belt 10 is an air belt.

  As shown in FIG. 1, the bag 20 is arranged from the side of the occupant's head to the front side of the upper body when the belt is worn. Hereinafter, of the outer peripheral surface of the bag 20 in the inflated state, a surface (rear side surface in this embodiment) facing the front surface of the upper body such as a chest of an occupant is referred to as a chest facing surface 22, The surface opposite to the facing surface 22 (the front side surface in this embodiment) is referred to as an anti-chest portion side surface 23, and the surface facing the side surface of the occupant's head (the right side surface in this embodiment) is the head facing surface 24. The surface opposite to the head facing surface 24 (the left side surface in this embodiment) is referred to as the non-head-side surface 25.

  The vent hole 21 is provided on the opposite chest side surface 23 of the bag 20. Further, the vent hole 21 is disposed so as to be located at substantially the same height as the vicinity of the chest of the occupant when the belt is worn. In this embodiment, as shown in FIG. 1, the vent hole 21 has a substantially circular opening shape. However, the opening shape of the vent hole 21 is not limited to this.

  Although detailed illustration is omitted, the bag 20 is formed by folding a thick belt-shaped bag body into a narrow belt shape and covering it with a cover, and is normally held in a belt shape. The vent hole 21 communicates the inside and outside of the bag body.

  A tongue 13 is connected to an end (hereinafter referred to as a front end) on the side of the occupant's waist when the bag 20 is worn. Further, one end of a webbing 20a made of a non-inflatable belt material similar to a general seat belt is connected to an end portion (hereinafter referred to as a rear end) on the passenger head side when the bag 20 is worn. Has been. The webbing 20a is passed through the shoulder anchor 14, and the other end is connected to the shoulder belt retractor 15 so as to be drawn out and wound.

  The shoulder anchor 14 is rotatably attached to the side surface of the passenger compartment opposite to the seat buckle device 12 (left side in this embodiment), for example, the upper part of the pillar portion of the vehicle body. The shoulder belt retractor 15 is also installed on the vehicle body on the side opposite to the seat buckle device 12. The shoulder belt retractor 15 is provided with a lock mechanism that locks the drawer of the webbing 20a when the vehicle collides.

  In this embodiment, an inflator 30 is connected to the buckle device 12, and a gas passage (not shown) for introducing gas from the inflator 30 into the bag 20 is provided in the tongue 13.

  In this embodiment, the lap belt 11 is made of a non-expandable belt material similar to a general non-expandable seat belt. The lap belt 11 has one end connected to the tongue 13 and the other end connected to the lap belt retractor 16 so that it can be drawn out and wound. The lap belt retractor 16 is also installed on the vehicle body on the side opposite to the seat buckle device 12. The lap belt retractor 16 is also provided with a lock mechanism that locks the drawer of the lap belt 11 when the vehicle collides.

  In this embodiment, the gas outflow regulating member 40 includes a lid body 41 that covers the vent hole 21, a tether 42 that connects the lid body 41 and the chest facing surface 22 of the bag 20 in the bag 20, and the like. ing.

  In this embodiment, the lid body 41 has a strip shape. The lid 41 is inserted into the vent hole 21, and one end side (hereinafter referred to as a base end side) is disposed outside the bag 20, and the other end side (hereinafter referred to as a front end side). It is arranged inside. The lid body 41 is disposed so as to extend in the circumferential direction of the bag 20, and the base end side thereof is coupled to the outer surface of the bag 20 by sewing or the like in the vicinity of the vent hole 21. Reference numeral 43 indicates a seam of this stitching. One end of the tether 42 is connected to the distal end side of the lid 41.

  In this embodiment, as shown in FIGS. 2 to 4, the lid body 41 and the tether 42 are integrally formed of a common base cloth. However, the lid body 41 and the tether 42 may be configured separately, and one end of the tether 42 may be sewn to the distal end side of the lid body 41.

  In this embodiment, a tether insertion portion 44 is provided on the inner peripheral surface of the bag 20 on the side opposite to the chest 23 of the bag 20. The tether insertion portion 44 is disposed on the distal end side of the lid body 41 with respect to the vent hole 21. In this embodiment, the tether insertion portion 44 is formed of a small rectangular cross. The small cross is arranged with its longitudinal direction being substantially orthogonal to the extending direction of the lid 41, and both ends in the longitudinal direction are joined to the bag inner peripheral surface of the anti-chest portion side surface 23 by sewing or the like. Reference numeral 45 indicates a seam of this stitching.

  The tether 42 is led from the vent hole 21 side to the tether insertion portion 44, that is, between the small cross and the bag inner peripheral surface of the anti-chest side surface 23, and the other end is sewn to the chest facing surface 22 of the bag 20 or the like. Are combined. Reference numeral 46 indicates a seam of this stitching.

  As shown in FIG. 2, the length of the tether 42 is such that the tether 42 is tensioned between the chest facing surface 22 and the anti-chest side surface 23 of the bag 20, As a result, the front end side of the lid body 41 is pulled in a direction away from the base end side, the lid body 41 is tensioned along the circumferential direction of the bag 20, and the lid body 41 overlaps the vent hole 21. It is said that.

  In this embodiment, the width of the lid body 41 is substantially the same as the inner diameter of the vent hole 21, and when the lid body 41 overlaps the vent hole 21, substantially the entire vent hole 21 is the lid body 41. The vent hole 21 is configured to be substantially fully closed. However, in the present invention, the width of the lid 41 is made smaller than the inner diameter of the vent hole 21, and the vent hole 21 is partially opened even when the lid 41 overlaps the vent hole 21. May be.

  Below, the usage method and operation | movement of an air belt apparatus comprised in this way are demonstrated.

  When wearing the belt, the shoulder belt 10 is slanted on the front side of the occupant's upper body, and the lap belt 11 is hung on the upper side of the waist in the left-right direction, and the tongue 13 is connected to the buckle device 12 in the same manner as a normal seat belt. To do.

  In the event of a vehicle collision or the like, the inflator 30 operates to eject gas, and the gas ejected from the inflator 30 flows into the bag 20 through the gas passage of the tongue 13 and the bag 20 starts to expand.

  At this time, when the bag 20 is inflated, the chest facing surface 22 and the anti-chest portion side surface 23 of the bag 20 are separated from each other, whereby the tether 42 is pulled by the chest facing surface 22 in a direction away from the anti-chest portion side surface 23. Tension occurs between the chest facing surface 22 and the anti-chest side surface 23. Accordingly, the tether 42 pulls the distal end side of the lid body 41 away from the proximal end side, and the lid body 41 is also tensioned along the circumferential direction of the bag 41. As shown in FIG. The body 41 overlaps the vent hole 21. As a result, the vent hole 21 is closed, the outflow of gas from the vent hole 21 to the outside of the bag 20 is restricted, and the bag 20 is rapidly expanded.

  At the time of a vehicle front collision, as shown in FIG. 3, the upper body of the occupant moves forward and presses the chest facing surface 22 of the inflated bag 20. As a result, the chest facing surface 22 is retracted into the bag 20 and the tether 42 is relaxed, so that the front end side of the lid body 41 can be moved to the outside of the bag 20, and as shown in FIG. The side is pushed out of the bag 20 from the vent hole 21 by the gas pressure in the bag 20, and the vent hole 21 is opened. Thereby, the gas in the bag 20 flows out of the bag 20 through the vent hole 21, and the upper body of the occupant is softly received by the bag 20.

  At the time of vehicle side collision and rollover, as shown in FIG. 4, the occupant's upper body moves so as to fall toward the passenger compartment door, and the occupant's head presses the head-facing surface 24 of the bag 20 inflated. In this case, the head-facing surface 24 is retracted into the bag 20, but the chest-facing surface 22 is not retracted, so that the tether 42 is not relaxed, and the lid body 41 remains overlapping the vent hole 21. In this case, rather, the head-facing surface 24 recedes into the bag 20 and the bag 20 is flattened so that the chest-facing surface 22 and the anti-chest-side surface 23 are separated from each other, so that the tension applied to the tether 42 increases. The lid 41 is strongly pressed against the anti-thoracic side surface 23 around the vent hole 21 and the closing performance of the vent hole 21 is enhanced.

  Thus, at the time of a vehicle side collision and rollover, the vent hole 21 remains closed by the lid 41 even if the head 20 is pressed against the head-facing surface 24 of the bag 20 inflated. Since the gas in the bag 20 does not flow out of the bag 20 through the vent hole 21, the internal pressure of the bag 20 is maintained high for a long period of time. Thereby, it can prevent over a long period that a passenger | crew's head contacts a vehicle compartment side surface.

  In this embodiment, only one vent hole 21 is provided in the bag 20, but two or more vent holes 21 may be provided. When two or more vent holes are provided, all vent holes may be open / closed vent holes that are opened and closed by the lid body 41, and at least some of the vent holes are normally open vent holes that are not closed by the lid body 41. It may be. A normally open vent hole having a smaller diameter than the vent hole 21 may be provided at a position overlapping the vent hole 21 in the lid 41.

  FIG. 5 is a perspective view of an air belt apparatus provided with an air belt according to another embodiment, FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5, and FIG. 7 is a chest facing surface of the inflated bag. FIG. 8 is a cross-sectional view of the same part as in FIG. 6 showing the state pressed by the occupant chest, and FIG. 8 is a cross-sectional view of the same part as in FIG. 6 showing the state where the head facing surface of the inflated bag is pressed by the occupant head FIG.

  The air belt device of this embodiment includes the number and arrangement of vent holes provided in the bag 20, the configuration of the vicinity of the vent hole of the bag 20, and a gas outflow regulating member for regulating gas outflow from the vent hole Is different from the above-described embodiment.

  In this embodiment, as shown in FIG. 8, the bag 20 is inflated so as to protrude forward from the anti-chest region side surface 23 by the gas pressure in the bag 20 as shown in FIG. The bulging part 47 which can be taken out is provided. Specifically, in this embodiment, the bulging portion 47 is configured by a base fabric formed in a substantially dome shape or bag shape. This base fabric is provided separately from the base fabric constituting the bag 20. In this embodiment, an opening 26 for attaching the bulging portion is formed on the side surface 23 of the bag 20 of the bag 20, and the peripheral portion of the bulging portion 47 is joined to the peripheral portion of the opening 26 by sewing or the like. . Reference numeral 48 indicates a seam of this stitching. The bulging portion 47 may be provided integrally with the bag 20.

  The bulging portion 47 is disposed so as to be positioned at substantially the same height as the vicinity of the chest of the occupant when the belt is worn.

  In this embodiment, the bulging portion 47 is provided with two vent holes 21A and 21B. These vent holes 21 </ b> A and 21 </ b> B are arranged at intervals in the circumferential direction of the bag 20. In this embodiment, the vent holes 21A and 21B have substantially circular opening shapes, but the opening shapes of the vent holes 21A and 21B are not limited to this.

  The gas outflow regulating member 40A in this embodiment includes the bulging portion 47 and a tether 49 that connects the bulging portion 47 and the chest facing surface 22 of the bag 20 in the bag 20. In this embodiment, the tether 49 has one end joined to a portion between the vent holes 21A and 21B on the inner side surface of the bag of the bulging portion 47 by sewing or the like, and the other end is connected to the chest facing surface 22. The bag is joined to the inner peripheral surface of the bag by sewing or the like. Reference numerals 50 and 51 denote seams of the stitches, respectively.

  In this embodiment, the length of the tether 49 is such that when the bag 20 is inflated to its inflated shape, the bulging portion 47 is not exposed until the vent holes 21A, 21B are completely exposed to the outer surface of the bag 20. The size is such that it can be pulled into the bag 20.

  Other configurations of this embodiment are the same as those of the above-described embodiment shown in FIGS. 1 to 4. In FIGS. 5 to 8, the same reference numerals as those in FIGS. 1 to 4 denote the same parts.

  The operation of the air belt device of this embodiment is as follows.

  Also in this embodiment, in the event of a vehicle collision or the like, the inflator 30 performs gas ejection operation, and the gas ejected from the inflator 30 flows into the bag 20 through the gas passage of the tongue 13 and the bag 20 starts to expand. To do.

  At this time, when the bag 20 is inflated, the chest facing surface 22 and the anti-chestnut side surface 23 of the bag 20 are separated from each other, so that the bulging portion 47 enters the bag 20 via the tether 49 as shown in FIG. The vent holes 21 </ b> A and 21 </ b> B are not exposed or almost exposed to the outer surface of the bag 20. As a result, the outflow of gas from the vent holes 21A and 21B to the outside of the bag 20 is restricted, and the bag 20 is quickly expanded.

  At the time of a vehicle front collision, as shown in FIG. 7, the upper body of the occupant moves forward and presses the chest facing surface 22 of the inflated bag 20. As a result, the chest-facing surface 22 is retracted into the bag 20 and the tether 49 is relaxed, and the bulging portion 47 can be moved to the outside of the bag 20. As shown in FIG. The gas pressure in the bulge 20 bulges out from the side surface 23 of the chest and the vent holes 21 </ b> A and 21 </ b> B are exposed on the outer surface of the bag 20. Thereby, the gas in the bag 20 flows out of the bag 20 through the vent holes 21 </ b> A and 21 </ b> B, and the upper body of the occupant is softly received by the bag 20.

  At the time of vehicle side collision and rollover, as shown in FIG. 8, the occupant's upper body moves so as to fall toward the passenger compartment door, and the occupant's head presses the head-facing surface 24 of the bag 20 inflated. In this case, the head-facing surface 24 retracts into the bag 20, but the chest-facing surface 22 does not retract, so the tether 49 does not relax and the bulging portion 47 remains pulled into the bag 20. Yes. Therefore, the vent holes 21 </ b> A and 21 </ b> B are not exposed on the outer surface of the bag 20. In this case, rather, the head-facing surface 24 recedes into the bag 20 and the bag 20 is flattened so that the chest-facing surface 22 and the anti-chest-side surface 23 are separated from each other, so that the tension applied to the tether 49 increases. The bulging portion 47 is strongly drawn into the bag 20 and the closing properties of the vent holes 21A and 21B are enhanced.

  As described above, even in this embodiment, the vent holes 21A and 21B remain in the bag even when the occupant's head presses the head-facing surface 24 of the inflated bag 20 at the time of a vehicle side collision and rollover. Since the gas is not exposed to the outer surface of the bag 20, the gas in the bag 20 hardly flows out of the bag 20 through the vent holes 21A and 21B, and the internal pressure of the bag 20 is kept high for a long time. Thereby, it can prevent over a long period that a passenger | crew's head contacts a vehicle compartment side surface.

  In this embodiment, two vent holes are provided in the bag 20, but only one or three or more may be provided. When two or more vent holes are provided, all vent holes may be open / closed vent holes that can be drawn into the bag 20 by the tether 49, and at least some of the vent holes are drawn into the bag 20 by the tether 49. It may be a normally open vent hole.

  Each of the above embodiments shows an example of the present invention, and the present invention is not limited to each of the above embodiments.

  For example, in each of the above embodiments, the vent hole is circular, but the opening shape of the vent hole is not limited to this. For example, the vent hole may have a slit shape.

  In each of the above embodiments, an inflatable bag is provided only on the shoulder belt 10, but an inflatable bag may also be provided on the lap belt 11. The gas supply system to the bag, the winding system when the belt is not attached, the belt hanging structure to the tongue or through anchor, and the like may be other than the illustrated ones.

It is a perspective view of an air belt device provided with an inflatable air belt concerning an embodiment. It is sectional drawing which follows the II-II line of FIG. It is sectional drawing of the same part as FIG. 2 which shows the state by which the chest opposing surface of the expanded bag was pressed by the passenger | crew chest. It is sectional drawing of the part similar to FIG. 2 which shows the state by which the head opposing surface of the expanded bag was pressed by the passenger | crew head. It is a perspective view of an air belt device provided with an inflatable air belt concerning an embodiment. It is sectional drawing which follows the VI-VI line of FIG. It is sectional drawing of the same part as FIG. 6 which shows the state by which the chest opposing surface of the expanded bag was pressed by the passenger | crew chest. It is sectional drawing of the same part as FIG. 6 which shows the state by which the head opposing surface of the expanded bag was pressed by the passenger | crew head.

Explanation of symbols

10 Shoulder belt (air belt)
DESCRIPTION OF SYMBOLS 11 Wrap belt 12 Buckle apparatus 13 Tongue 14 Shoulder anchor 20 Bag 21,21A, 21B Vent hole 22 Bag chest opposing surface 23 Bag anti chest side 24 Bag head opposing surface 25 Bag anti head side 30 Inflator 40, 40A Gas Outflow Control Member 41 Lid 42 Tether 44 Tether Insertion Portion 47 Swelling Portion 49 Tether

Claims (7)

An inflatable bag disposed at least from the side of the occupant's head to the front side of the chest;
In the air belt provided with the vent hole provided in the bag for allowing the gas in the bag to flow out of the bag,
The air belt further includes:
In the state where the bag is inflated, the vent hole is closed or a small opening degree until the bag is pressed by an occupant,
At the time of a vehicle front collision, when the inflated bag is pressed by an occupant, the vent hole is opened or opened to a large degree,
An air belt comprising a gas outflow restricting member that closes the vent hole or keeps a small opening at the time of a vehicle side collision and rollover. 2. The bag according to claim 1, wherein in the inflated state, the bag faces a chest facing surface facing the front of the chest of the occupant, a side opposite to the chest facing side, and a side facing the side of the head of the occupant. Part opposite surface and the opposite head side surface opposite to the head opposite surface,
In the state where the bag is inflated, the gas outflow regulating member opens the vent hole or opens a large opening when the chest facing surface is pressed from the chest of an occupant,
An airbelt configured to close or keep the vent hole closed when the head facing surface is pressed from the head of an occupant. The vent hole according to claim 2, wherein the vent hole is disposed on a side surface of the chest opposite to the bag,
The gas outflow regulating member is
A lid covering the vent hole;
A tether disposed in the bag and connecting the lid and the chest facing surface;
When the bag is inflated, the tether is tensioned between the lid and the chest facing surface, thereby preventing the lid from being separated from the vent hole, and the lid prevents the vent hole from being separated. Closed or small opening,
When the chest facing surface of the inflated bag is pressed from the occupant's chest, the tether relaxes, whereby the lid is separated from the vent hole by the gas pressure in the bag, thereby The hall is opened or opened large,
The tether does not relax when the head-facing surface of the inflated bag is pressed from the occupant's head, whereby the vent hole is closed or left at a small opening. Air belt. 4. The lid according to claim 3, wherein the lid extends across the vent hole, at least one end side in the extending direction of the lid body is coupled to the bag, and the other end side is uncoupled from the bag. And
On the inner side surface of the bag on the side opposite to the chest, a tether insertion part is provided on the one end side of the lid from the vent hole,
The air belt according to claim 1, wherein one end of the tether is connected to the one end side of the lid, a middle portion is inserted into the tether insertion portion, and the other end is connected to the chest-opposing surface. The vent hole according to claim 2, wherein the vent hole is disposed on a side surface of the chest opposite to the bag,
The gas outflow regulating member is
A tether disposed in the bag and connected to a portion near the vent hole on the side of the opposite chest and the chest facing surface;
When the bag is inflated, the vent hole vicinity is drawn into the bag by the tether so that the vent hole is closed or opened to a small degree.
When the chest facing surface of the inflated bag is pressed from the occupant's chest, the tether relaxes, thereby causing the bag to swell so that the vent hole is exposed to the outer surface of the bag, thereby The vent hole is open or has a large opening,
The tether does not relax when the head-facing surface of the inflated bag is pressed from the occupant's head, whereby the vent hole is closed or left at a small opening. Air belt. In Claim 5, two vent holes are arranged close to the side of the anti-chest,
One end of the tether is connected to a portion between the vent holes on the side surface of the opposite chest part.   An inflatable belt apparatus comprising: the inflatable belt according to any one of claims 1 to 6; and an inflator for inflating the bag of the inflatable belt.

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