JP2016060434A - Air belt device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air belt device which dissipates a load applied when restraining an occupant to a main restraint member and a sub restraint member.SOLUTION: An air belt device 10 includes: webbing 16 (a main restraint member) for restraining an occupant 14 seated on a seat 12; an expansion part 18 connected with the webbing 16 and configured to expand in a width direction of the main webbing (the main restraint member) when receiving gas supply; and a design cover 22 (a sub restraint member) which is provided in parallel to the main webbing, connected with the webbing 16 above and below the expansion part 18, and connected with the expansion part 18 in a position separated from a connection position between the webbing 16 and the expansion part 18 in the width direction of the webbing 16 in an expansion state of the expansion part 18 to restrain the occupant 14.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an air belt device.

  A tri-fold airbag mounted on a webbing is disclosed which has an inflated shape in which a plurality of parallel tubular bags are connected when inflated and deployed from a folded state (Patent Document 1). reference).

JP 2013-184559 A

  However, in the above-described conventional example, since the airbag is inflated and deployed around the webbing, when the internal pressure of the airbag is increased, the portion that contacts the occupant is concentrated near the webbing, and the load at the time of restraining the occupant is difficult to be distributed to the airbag. it is conceivable that.

  In view of the above fact, an object of the present invention is to disperse a load at the time of restraining an occupant to a main restraining member and a sub restraining member.

  An inflatable belt device according to claim 1 is a belt-like main restraining member for restraining an occupant seated on a seat, and is connected to the main restraining member, and in the width direction of the main restraining member when supplied with gas. An inflatable portion that is deployed and provided in parallel to the main restraining member, and connected to the main restraining member above and below the inflating portion, and the main restraining member and the inflating portion in the deployed state of the inflating portion And a secondary restraining member that restrains the occupant and is connected to the inflating portion at a position away from the connecting position in the width direction of the main restraining member.

  In this inflatable belt device, when the inflating part is supplied with gas and expands in the width direction of the main restraining member, the main restraining member and the sub restraining member respectively connected to the inflating part have a width of the main restraining member. Leave in the direction. When the main restraining member and the sub restraining member are separated, the contact area when restraining the occupant seated on the seat increases. For this reason, the load at the time of occupant restraint can be distributed to the main restraint member and the secondary restraint member.

  According to a second aspect of the present invention, in the inflatable belt device according to the first aspect, the main restraining member is provided at one end of the inflating portion in the width direction of the main restraining member in the deployed state of the inflating portion, The sub-restraining member is connected to the other end of the inflating part.

  In this air belt device, the main restraining member is provided at one end of the inflating portion and the sub restraining member is connected to the other end in the width direction of the main restraining member. A restraining member will be located in the both sides of an expansion part. For this reason, the load at the time of passenger | crew restraint can be disperse | distributed to the main restraint member and the sub restraint member in a wide range.

  According to a third aspect of the present invention, in the inflatable belt device according to the first or second aspect, the inflatable portion is an upper chamber that is deployed above the sub-constraint member, and a lower chamber that is deployed below the sub-constraint member. And have.

  In this air belt device, the upper chamber and the lower chamber develop when the inflatable portion develops upon receiving supply of gas. By limiting the parts to be developed in this way, the base fabric and capacity of the inflatable part can be reduced. In addition, this makes it possible to speed up the expansion of the inflatable portion and reduce the cost.

  According to a fourth aspect of the present invention, in the inflatable belt device according to any one of the first to third aspects, the main restraint member is webbing, and the sub restraint member is the folded main restraint member and A design cover that wraps around the inflatable part and is cleaved by the expansion of the inflatable part.

  In this inflatable belt device, the inflatable portion receives gas supply and expands in the width direction of the main restraining member, whereby the webbing and the design cover are separated in the width direction of the main restraining member. When the webbing and the design cover are separated, the contact area when restraining the occupant seated on the seat increases. For this reason, the load at the time of occupant restraint can be distributed to the webbing and the design cover.

  According to a fifth aspect of the present invention, in the air belt device according to any one of the first to third aspects, the main restraining member and the sub restraining member are both webbing.

  In this inflatable belt device, when the inflating portion is supplied with gas and expands in the width direction of the main webbing, the main webbing and the sub webbing are separated in the width direction of the main webbing. When the main webbing and the sub webbing are separated, the contact area when restraining the occupant seated on the seat increases. For this reason, the load at the time of occupant restraint can be distributed to the main webbing and the sub webbing.

  As described above, according to the air belt device of the first aspect, the excellent effect that the load at the time of occupant restraint can be distributed to the main restraint member and the secondary restraint member is obtained.

  According to the air belt device of the second aspect, an excellent effect is obtained that the load at the time of restraining the occupant can be dispersed over a wide range in the main restraining member and the sub restraining member.

  According to the air belt device of the third aspect, it is possible to obtain an excellent effect that the expansion of the inflatable portion can be speeded up and the cost can be reduced.

  According to the air belt device of the fourth aspect, an excellent effect is obtained that the load at the time of occupant restraint can be distributed to the webbing and the design cover.

  According to the air belt device of the fifth aspect, an excellent effect that the load at the time of restraining the occupant can be distributed to the main webbing and the sub webbing can be obtained.

1 and 2 relate to a first embodiment, and FIG. 1 is a front view showing a state in which an inflating portion is deployed in an air belt device. (A) is an expanded sectional view which shows the air belt apparatus at the normal time in the position of arrow 2C-2C of FIG. FIG. 2B is an enlarged cross-sectional view showing a state in the middle of expansion of the inflatable portion at the cross-sectional position of FIG. (C) is an expanded sectional view which shows the state which the expansion | deployment part expand | deployed in the cross-sectional position of FIG. 2 (A). 3 to 5 relate to the second embodiment, and FIG. 3 is a front view showing a state in which the inflating portion is deployed in the inflatable belt device. (A) is an expanded sectional view which shows the air belt apparatus of the normal time in the position of the arrow 4C-4C of FIG. (B) is an expanded sectional view which shows the state in the middle of expansion | deployment of an expansion part in the cross-sectional position of FIG. 4 (A). (C) is an expanded sectional view which shows the state which the expansion | swelling part expand | deployed in the cross-sectional position of FIG. 4 (A). (A) is an expanded sectional view which shows the air belt apparatus at the normal time in the position of arrows 5B-5B in FIG. (B) is an expanded sectional view which shows the state which the expansion | swelling part expand | deployed in the cross-sectional position of FIG. 5 (A). 6 to 8 relate to the third embodiment, and FIG. 6 is a front view showing a state in which the inflating portion is deployed in the inflatable belt device. FIG. (A) is an expanded sectional view which shows the air belt apparatus at the normal time in the position of arrows 7C-7C in FIG. (B) is an expanded sectional view which shows the state in the middle of expansion | deployment of an expansion part in the cross-sectional position of FIG. 7 (A). (C) is an expanded sectional view which shows the state which the expansion | swelling part expand | deployed in the cross-sectional position of FIG. 7 (A). (A) is an expanded sectional view which shows the air belt apparatus of a normal time in the position of the arrow 8C-8C of FIG. (B) is an expanded sectional view which shows the state in the middle of expansion | deployment of an expansion part in the cross-sectional position of FIG. 8 (A). (C) is an expanded sectional view which shows the state which the expansion | swelling part expand | deployed in the cross-sectional position of FIG. 8 (A). 9 to 11 relate to the fourth embodiment, and FIG. 9 is a front view showing a state in which the inflating portion is deployed in the inflatable belt device. (A) is an expanded sectional view which shows the air belt apparatus at the normal time in the position of arrow 10C-10C of FIG. FIG. 10B is an enlarged cross-sectional view showing a state in the middle of development of the inflatable portion at the cross-sectional position of FIG. (C) is an expanded sectional view which shows the state which the expansion | deployment part expand | deployed in the cross-sectional position of FIG. 10 (A). (A) is an expanded sectional view showing an air belt device at the normal time at the position of arrows 11C-11C in FIG. FIG. 11B is an enlarged sectional view showing a state in the middle of the expansion of the inflating portion at the sectional position of FIG. FIG. 11C is an enlarged cross-sectional view showing a state where the inflating portion is developed at the cross-sectional position of FIG.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

[First Embodiment]
1 and 2, an air belt device 10 according to the present embodiment is a device for protecting an occupant 14 seated on a seat 12 in the event of a frontal collision of a vehicle (not shown), for example, and includes a main restraining member. A webbing 16 as an example, an inflating portion 18, and a design cover 22 as an example of a sub-constraint member.

  The webbing 16 is a belt-like member for restraining the occupant 14 seated on the seat 12. For example, the webbing 16 can be wound around a retractor (not shown), and when the occupant 14 is mounted, the webbing 16 can be pulled out of the retractor according to the physique of the occupant 14. The webbing 16 is passed through a tongue plate 26 that can be engaged with the buckle device 24. The tongue plate 26 can be moved to some extent along the webbing 16. The lower end of the webbing 16 is fastened to the anchor 29. The anchor 29 is provided at a lower portion on the side opposite to the installation side of the buckle device 24 in the seat 12.

  1 and 2, the inflating portion 18 is a bag body that is connected to the webbing 16 and expands in the width direction of the webbing 16 when gas is supplied from an inflator (not shown). This inflating part 18 is comprised by 1 chamber which expand | deploys planarly. The inflating part 18 is connected to the webbing 16 at the sewing part S1, and is connected to the design cover 22 at the sewing part S2. The sewing portion S <b> 1 is provided along the longitudinal direction of the webbing 16. There is a space through which gas can pass around the sewing part S1, and gas flows between the webbing 16 side and the design cover 22 side of the inflating part 18 through the space. The sewing direction of the sewing portion S2 is the longitudinal direction of the design cover 22. Thereby, in the retractor and the tongue plate 26, generation | occurrence | production of the wrinkle in the design cover 22 is suppressed.

  At least one of the upper end and the lower end of the expansion part 18 is provided with gas introduction parts 18U and 18L for supplying gas from the inflator into the expansion part 18. In the illustrated example, the gas introduction parts 18U and 18L are provided above and below the expansion part 18, but this is selectively used according to the arrangement of the inflator. When the inflator is disposed above the webbing 16 and gas is supplied from above, the upper gas introduction unit 18U is used. Further, when the inflator is disposed below the webbing 16 and the gas is supplied from below, the lower gas introduction portion 18L is used. The unused gas inlet can be used as a vent hole. Moreover, you may abbreviate | omit the gas introduction part of the side which is not used.

  When the webbing 16 is mounted by the occupant 14, the position of the upper end of the inflating portion 18 is located at the height of the head 14H of the occupant 14, for example. Similarly, the position of the lower end of the inflating part 18 is located at the height of the lower part of the chest 14C of the occupant 14, for example.

  As shown in FIG. 2A, the design cover 22 normally covers the inflatable portion 18 and the webbing 16 where the inflatable portion 18 is provided, and the end of the design cover 22 is sewn at the sewing portion S5. The parts are stitched along the longitudinal direction of the design cover 22. The sewing part S5 is located on the opposite side of the webbing 16 in the width direction with respect to the sewing part S2, and the design cover 22 is torn by breaking when the expansion part 18 is deployed. In the normal state, the inflating portion 18 is folded and overlapped with the webbing 16.

  As shown in FIG. 1, the design cover 22 is provided in parallel with the webbing 16. Both ends of the design cover 22 are connected to the webbing 16 above and below the inflating portion 18 (sewing portions S3 and S4). As shown in FIG. 2 (C), the design cover 22 is located in the width direction of the webbing 16 with respect to the connection position (sewing part S <b> 1) between the webbing 16 and the expanded part 18 in the expanded state of the expanded part 18. Is connected to the inflating part 18 (sewing part S2). In other words, the design cover 22 is connected to the inflating part 18 at a position away from the connection position (sewing part S1) between the webbing 16 and the inflating part 18 in the unfolding direction of the inflating part 18 in the unfolded state of the inflating part 18. (Sewing part S2). The design cover 22 is higher in rigidity than the inflatable portion 18 and serves as a member that restrains the occupant 14 when the inflatable portion 18 is deployed. If the rigidity is high, the extensibility becomes low, and thus the occupant 14 can be restrained.

  As shown in FIG. 2, the sewing portion S2 includes a first sewing portion S21, a second sewing portion S22, and a third sewing portion S23. In the first sewing portion S21, the base fabrics of the inflating portion 18 are sewn in an airtight manner in a state where two sheets are overlapped. In the second sewing portion S22, the base fabric of the inflatable portion 18 and one member of the two members constituting the design cover 22 are sewn in a state of being overlapped. And in 3rd sewing part S23, the two members which comprise the design cover 22 are piled up and sewn. As described above, in the sewing part S2 (the first sewing part S21, the second sewing part S22, and the third sewing part S23), the base fabric and the members are all overlapped.

(Function)
This embodiment is configured as described above, and the operation thereof will be described below. In FIG. 2A, in the air belt device 10 according to the present embodiment, the base fabric and the members are all overlapped at the sewing portion S2, so that the step is not conspicuous and the normal thickness can be reduced.

  In the vehicle, for example, when a frontal collision is detected, the inflator is activated and gas for expansion is generated. This gas is supplied to the expansion part 18 of the air belt device 10 through the gas introduction part 18U or the gas introduction part 18L (FIG. 1). When the expansion portion 18 starts to expand upon receiving the supply of gas, the sewing portion S5 (FIG. 2A) is broken by the pressure, and the design cover 22 is cleaved as shown in FIG. 2B. As a result, as shown in FIG. 2C, the inflatable portion 18 expands in the width direction of the webbing 16, and the webbing 16 and the design cover 22 respectively connected to the inflatable portion 18 are arranged in the width direction of the webbing 16. To leave. This increases the contact area when restraining the occupant 14 seated on the seat 12 with the air belt device 10 as compared with the normal time. For this reason, the load at the time of passenger restraint can be distributed to the webbing 16 and the design cover 22. Note that FIG. 2C shows a state in which gas has escaped to some extent after the expansion portion 18 has been deployed.

  In addition to this, since the inflating portion 18 is composed of one chamber that expands in a planar shape, the load at the time of restraining the occupant can be widely dispersed in the inflating portion 18 as well. Further, the restraint start timing of the occupant 14 can be advanced by the thickness of the inflatable portion 18, and the movement amount of the occupant 14 can be reduced. Furthermore, it is possible to stabilize the restraint state of the occupant 14 at the time of an oblique collision or a side collision.

  In FIG. 1, since both ends of the design cover 22 are connected to the webbing 16 at the sewing portions S3 and S4, when the occupant is restrained, tension is applied to the webbing 16 and the design cover 22, and the webbing 16 and the design cover 22 are Try to approach each other. However, in this embodiment, since the expansion part 18 exists between the webbing 16 and the design cover 22, such a movement is suppressed.

[Second Embodiment]
3 to 5, the air belt device 20 according to the present embodiment includes a main webbing 17 that is an example of a main restraining member, an inflating portion 28, and a sub webbing 32 that is an example of a sub restraining member. Both ends of the sub webbing 32 are connected to the main webbing 17 above and below the inflating part 28 (sewing parts S3, S4).

  In FIG. 3, the inflating portion 28 is a bag body that is connected to the main webbing 17 and the sub webbing 32 and expands in the width direction of the main webbing 17 when supplied with a gas from an inflator (not shown). In the expanded state, the expanded portion 28 has a structure in which, for example, two annular portions 28A and 28B arranged in series in the longitudinal direction of the main webbing 17 are connected by a connecting portion 28C. As shown in FIG. 4, each of the annular portions 28A and 28B is formed in a tubular shape. Further, as shown in FIG. 5, the connecting portion 28C is also formed in a tubular shape. The inside of the two annular portions 28A, 28B communicate with each other by the connecting portion 28C. In addition, although the expansion part 28 shall have two annular parts 28A and 28B, the annular part may be one place and may be three or more places.

  When the main webbing 17 is mounted by the occupant 14, the position of the upper end of the inflating portion 28 (the upper end of the annular portion 28A) is located at the height of the head 14H of the occupant 14, for example. Similarly, the position of the lower end of the inflating part 28 (the lower end of the annular part 28B) is located at the lower part of the chest 14C of the occupant 14, for example.

  As shown in FIG. 3, at least one of the upper end and the lower end of the inflating portion 28 is provided with gas introduction portions 28U and 28L for supplying gas from an inflator (not shown) into the inflating portion 28. Yes. The gas introduction portions 28U and 28L are selectively used according to the arrangement of the inflator, similarly to the gas introduction portions 18U and 18L in the first embodiment.

  As shown in FIG. 4C, in the expanded state of the inflatable portion 28, the main webbing 17 is connected to one end of the inflatable portion 28 in the width direction of the main webbing 17, and the sub webbing 32 is connected to the inflatable portion 28. Connected to the other end. Specifically, the annular portion 28A of the inflating portion 28 is connected to the main webbing 17 at the sewing portion S6 and is connected to the sub webbing 32 at the sewing portion S7. The sewing portions S6 and S7 are provided at positions where the annular portion 28A is widest in the width direction of the main webbing 17. As shown in FIG. 3, the annular portion 28B of the inflating portion 28 is connected to the main webbing 17 at the sewing portion S8, and is connected to the sub webbing 32 at the sewing portion S9. The sewing portions S8 and S9 are provided at positions where the annular portion 28B is most widened in the width direction of the main webbing 17.

  In FIG. 4, the design cover 22 normally covers the main webbing 17 where the inflating portion 18 and the inflating portion 28 are provided. In the present embodiment, since the auxiliary webbing 32 is provided as the auxiliary restraining member, the design cover 22 is a simple covering member. Therefore, the design cover 22 may be less rigid than the inflatable portion 28. Note that, as in the first embodiment, the design cover 22 may be used as a sub-constraint member.

  As shown in FIG. 4, in the width direction of the sub webbing 32, the end of the sub webbing 32 opposite to the sewing part S6 is connected to the design cover 22 (sewing part S10). The sewing part S10 has a first sewing part S101 and a second sewing part S102. In the first sewing portion S101, the sub-webbing 32 and one member of the two members constituting the design cover 22 are sewn in a state of being overlapped. In the second sewing portion S102, two members constituting the design cover 22 are sewn in an overlapping manner. Thus, in the sewing part S10 (the first sewing part S101 and the second sewing part S102), all the base fabrics and members are stacked. Thereby, although it is a simple structure, a level | step difference is not conspicuous in sewing part S10, and the thickness of the air belt apparatus 20 at the time of normal is thin.

  In addition, illustration of the design cover 22 is abbreviate | omitted in FIG. 5B, the annular portion 28A of the inflating portion 28 and the sewing portions S6 and S7 are shown, but these are not shown in FIG. 5A. Since other parts are the same as those in the first embodiment, the same parts are denoted by the same reference numerals in the drawings, and the description thereof is omitted.

(Function)
This embodiment is configured as described above, and the operation thereof will be described below. In FIG. 2A, in the air belt device 20 according to the present embodiment, the sub webbing 32 and the member of the design cover 22 are overlapped at the sewing portion S10, so that the step is not conspicuous and the thickness is normal. Can be thinned.

  In the vehicle, for example, when a frontal collision is detected, the inflator is activated and gas for expansion is generated. This gas is supplied to the expansion part 28 of the air belt device 20 through the gas introduction part 28U or the gas introduction part 28L (FIG. 3). When the expanding portion 28 starts to expand upon receiving the supply of gas, the sewing portion S5 (FIGS. 4A and 5A) is broken by the pressure, and the design as shown in FIG. The cover 22 is cleaved. As a result, as shown in FIG. 4C, the annular portions 28A and 28B of the inflating portion 28 expand in the width direction of the main webbing 17, and the main webbing 17 and the sub webbing 32 connected to the inflating portion 28, respectively. Are separated in the width direction of the main webbing 17. Specifically, the main webbing 17 and the sub webbing 32 are located on both sides of the inflating portion 28. For this reason, compared with the normal time, the contact area at the time of restraining the passenger | crew 14 who seated on the sheet | seat 12 with the air belt apparatus 20 increases. For this reason, the load at the time of occupant restraint can be dispersed in a wide range on the main webbing 17 and the sub webbing 32.

[Third Embodiment]
6 to 8, the air belt device 30 according to the present embodiment includes a main webbing 17, a sub webbing 32, and an inflating portion 38.

  The inflating portion 38 has an upper chamber 38A that develops above the sub webbing 32 and a lower chamber 38B that develops below the sub webbing 32 when the occupant 14 is wearing the main webbing 17. The upper chamber 38 </ b> A and the lower chamber 38 </ b> B communicate with each other through a communication portion 38 </ b> C along the longitudinal direction of the main webbing 17. The communicating portion 38C overlaps the lower side (occupant side) of the main webbing 17 when the inflating portion 38 is deployed. In FIG. 6, the width of the communication portion 38 </ b> C is wider than the width of the main webbing 17, but may be equal to or less than the width of the main webbing 17.

  In the expanded state of the inflating portion 38, the length of the upper chamber 38A and the length of the lower chamber 38B are set to be equal. The length direction is the width direction of the main webbing 17 at the portion where the upper chamber 38A and the lower chamber 38B are respectively located. The lengths of the upper chamber 38A and the lower chamber 38B may be different from each other. For example, the lower chamber 38B may be set longer than the upper chamber 38A.

  As shown in FIG. 6, the upper chamber 38A is connected to the main webbing 17 at the sewing portion S11 and is connected to the sub webbing 32 at the sewing portion S12. Further, the lower chamber 38B is connected to the main webbing 17 at the sewing portion S13, and is connected to the sub webbing 32 at the sewing portion S14. In the position between the upper chamber 38A and the lower chamber 38B, for example, the position 8C-8C in FIG. 6, the inflating portion 38 is not connected to either the main webbing 17 or the sub webbing 32 (FIG. 8C). ).

  In the state where the main webbing 17 is mounted by the occupant 14, the position of the upper chamber 38A is positioned at the height of the head 14H of the occupant 14, for example. Similarly, the position of the lower chamber 38 </ b> B is located at a height below the chest 14 </ b> C of the occupant 14, for example.

  As shown in FIG. 6, at least one of the upper end and the lower end of the inflating portion 38 is provided with gas introduction portions 38U and 38L for supplying gas from an inflator (not shown) into the inflating portion 38. Yes. The gas introduction portions 38U and 38L are selectively used according to the arrangement of the inflator, similarly to the gas introduction portions 18U and 18L in the first embodiment.

  As shown in FIGS. 7 and 8, the design cover 22 is composed of two members that wrap the main webbing 17, the sub webbing 32, and the expansion portion 38, and each member is sewn at the sewing portions S 5 and S 15. Yes. The design cover 22 is not connected to the sub webbing 32. Therefore, the design cover 22 can be detached from the sub webbing 32 when the inflating portion 38 is deployed. The design cover 22 may be connected to the sub webbing 32.

  Note that a curtain-like non-expandable portion (not shown) may be provided in a region of the expansion portion 38 between the upper chamber 38A and the lower chamber 38B. In this case, the load at the time of restraining the occupant can also be distributed to the non-inflatable portion.

  Since other parts are the same as those in the first embodiment or the second embodiment, the same parts are denoted by the same reference numerals and the description thereof is omitted.

(Function)
This embodiment is configured as described above, and the operation thereof will be described below. In the vehicle, for example, when a frontal collision is detected, the inflator is activated and gas for expansion is generated. This gas is supplied to the expansion part 38 of the air belt device 30 through the gas introduction part 38U or the gas introduction part 38L (FIG. 6). When the expanding portion 38 starts to expand upon receiving the supply of gas, the sewing portion S5 (FIGS. 7A and 8A) is broken by the pressure, and the design as shown in FIG. The cover 22 is cleaved. Then, as shown in FIG. 6, the upper chamber 38A and the lower chamber 38B of the expansion portion 38 are expanded in the width direction of the main webbing 17, and the main webbing 17 and the sub webbing 32 respectively connected to the expansion portion 38 are provided. The main webbing 17 is separated in the width direction (FIGS. 7C and 8C). Thereby, compared with the normal time, the contact area when restraining the occupant 14 seated on the seat 12 with the air belt device 30 increases. For this reason, the load at the time of passenger restraint can be dispersed in a wide range. FIGS. 7C and 8C show a state where gas has escaped to some extent after the expansion portion 38 has been deployed.

  In this embodiment, as shown in FIG. 6 and FIG. 8, the portion that develops as the expansion portion 38 is limited to the upper chamber 38A, the lower chamber 38B, and the communication portion 38C. Thereby, the capacity | capacitance of the expansion part 38 and the base fabric which comprises the expansion part 38 can be decreased. This also makes it possible to speed up the deployment of the inflatable portion 38 and reduce the cost.

[Fourth Embodiment]
9 to 11, the air belt device 40 according to the present embodiment includes a main webbing 17 and a sub webbing 32, and an inflating portion 48.

  The expansion portion 48 includes an upper chamber 48A, a lower chamber 48B, and a middle chamber 48C. The upper chamber 48 </ b> A is a portion that develops above the sub webbing 32 in a state where the occupant 14 is wearing the main webbing 17. The lower chamber 48 </ b> B is a portion that develops below the sub webbing 32 in a state where the occupant 14 is wearing the main webbing 17. The middle chamber 48C is located between the upper chamber 48A and the lower chamber 48B, and communicates with the upper chamber 48A and the lower chamber 48B. In the state in which the main webbing 17 is mounted by the occupant 14, the position of the upper chamber 48A is positioned at the height of the head 14H of the occupant 14, for example. Similarly, the position of the lower chamber 48B is located at a height below the chest 14C of the occupant 14, for example.

  As shown in FIG. 10C, the upper chamber 48 </ b> A and the lower chamber 48 </ b> B of the inflating portion 48 are entirely overlapped with the main webbing 17 and the subwebbing 32, respectively. Specifically, the main webbing 17 is superimposed on the lower side (occupant side) of the upper chamber 48A and the lower chamber 48B, and is sewn at the sewing portions S16 and S17. The sub webbing 32 is superposed on the upper side (counter occupant side) of the upper chamber 48A, the middle chamber 48C, and the lower chamber 48B, and is continuously sewn in the sewing portion S18.

  On the other hand, as shown in FIGS. 9 and 11C, the middle chamber 48 </ b> C is overlaid on the sub webbing 32, but is not overlaid on the main webbing 17. In other words, the width of the middle chamber 48C at the position of the arrow 11C-11C is smaller than the width of the upper chamber 48A at the position of the arrow 10C-10C. The middle chamber 48C may partially overlap the main webbing 17.

  As shown in FIGS. 9 and 10A, a sewing part S18 for partially sewing the base fabrics facing each other is provided in the central part of the upper chamber 48A and the lower chamber 48B. The sewing portion S18 is provided to stabilize the development of the upper chamber 48A and the lower chamber 48B. In addition, the folding shape of the expansion part 48 is, for example, a bellows fold.

  At least one of the upper end and the lower end of the expansion part 48 is provided with a gas introduction part (not shown) for supplying gas from the inflator (not shown) into the expansion part 48. This gas introduction part is selectively used according to the arrangement of the inflator, similarly to the gas introduction parts 18U and 18L in the first embodiment.

  Since other parts are the same as those of the third embodiment, the same parts are denoted by the same reference numerals and description thereof will be omitted.

(Function)
This embodiment is configured as described above, and the operation thereof will be described below. In the vehicle, for example, when a frontal collision is detected, the inflator is activated and gas for expansion is generated. This gas is supplied to the expansion part 48 of the air belt device 40 through a gas introduction part (not shown). When the expansion portion 48 starts to expand upon receiving the supply of gas, the sewing portion S5 (FIGS. 10A and 11A) is broken by the pressure, and the design as shown in FIG. The cover 22 is cleaved. As shown in FIG. 9, the upper chamber 48A and the lower chamber 48B of the expansion portion 48 are expanded in the width direction of the main webbing 17, and the main webbing 17 and the sub webbing 32 connected to the expansion portion 48 are provided. The main webbing 17 moves away in the width direction (FIGS. 10C and 11C). Thereby, compared with the normal time, the contact area at the time of restraining the passenger | crew 14 seated on the sheet | seat 12 with the air belt apparatus 40 increases. For this reason, the load at the time of passenger restraint can be dispersed in a wide range. 10 (C) and 11 (C) show a state in which gas has escaped to some extent after the expansion portion 48 is deployed.

  In the present embodiment, since the sewing portion S18 is provided at the center of the upper chamber 48A and the lower chamber 48B, the development of the upper chamber 48A and the lower chamber 48B is stabilized. Further, since the middle chamber 48C is provided between the upper chamber 48A and the lower chamber 48B, the load at the time of restraining the occupant can be widely dispersed also in the inflating portion 48. Moreover, the restraint start timing of the passenger | crew 14 can be advanced by the thickness of the expansion part 48, and the movement amount of the passenger | crew 14 can be reduced.

  Further, as shown in FIG. 9, the width of the middle chamber 48C at the position of the arrow 11C-11C is smaller than the width of the upper chamber 48A at the position of the arrow 10C-10C. Accordingly, the capacity of the inflating part 48 and the base fabric constituting the inflating part 48 can be reduced. This also makes it possible to speed up the deployment of the inflatable portion 48 and reduce the cost.

  Further, since the sewing portion S17 is continuously provided over the upper chamber 48A, the middle chamber 48C, and the lower chamber 48B, the displacement between the inflating portion 48 and the sub webbing 32 hardly occurs. For this reason, it is also possible to stabilize the restraint state of the occupant 14 at the time of an oblique collision or a side collision.

[Other Embodiments]
As mentioned above, although an example of embodiment of this invention was demonstrated, embodiment of this invention is not limited above, In addition to the above, in a range which does not deviate from the main point, it can implement variously. Of course there is.

  Although the webbing 16 and the main webbing 17 are mentioned as the main restraining members, the main restraining members are not limited to this, and may be any members that can restrain the occupant 14. Moreover, although the design cover 22 and the sub webbing 32 were mentioned as a sub restraining member, a sub restraining member is not restricted to this, What is necessary is just a member which can restrain the passenger | crew 14. FIG. Further, the number of sub-constraint members is not limited to one, and two or more sub-constraint members may be provided in parallel to the main restraint member.

  The expanded portion 18 in FIG. 2C, the expanded portion 38 in FIG. 7C and FIG. 8C, and the expanded portion 48 in FIG. 10C and FIG. Each one is shown small. This shows a state in which a tension is applied to each inflatable portion, and the thickness of the inflatable portion becomes larger in a state in which no tension is applied. 4 (C) and FIG. 5 (C), the width of the annular portions 28A and 28B varies depending on the tension (FIG. 6).

  It is possible to appropriately combine the configurations described in the embodiments.

10 air belt device 12 seat 14 passenger 16 webbing (main restraint member)
17 Main webbing (main restraint member)
18 inflatable part 20 air belt device 22 design cover (sub-restraint member)
28 Inflatable part 30 Air belt device 32 Sub webbing (sub restraining member)
38 Inflating part 38A Upper chamber 38B Lower chamber 40 Air belt device 48 Inflating part 48A Upper chamber 48B Lower chamber

Claims (5)

A belt-like main restraining member for restraining an occupant seated on the seat;
An inflatable portion that is connected to the main restraining member and expands in the width direction of the main restraining member when supplied with gas;
It is provided in parallel with the main restraining member, and is connected to the main restraining member above and below the inflating portion, and with respect to the connection position between the main restraining member and the inflating portion in the expanded state of the inflating portion. A secondary restraining member that restrains the occupant connected to the inflating portion at a position away from the main restraining member in the width direction;
An inflatable belt device.   In the expanded state of the inflating part, the main restraining member is provided at one end of the inflating part in the width direction of the main restraining member, and the auxiliary restraining member is connected to the other end of the inflating part. The air belt device according to claim 1.   3. The air belt device according to claim 1, wherein the inflating portion includes an upper chamber that expands at an upper portion of the sub-restraining member and a lower chamber that expands at a lower portion of the sub-restraining member. The main restraining member is webbing,
The air belt device according to any one of claims 1 to 3, wherein the sub-constraint member is a design cover that wraps the folded main restraint member and the inflatable portion and is torn by expansion of the inflatable portion.   The air belt device according to any one of claims 1 to 3, wherein each of the main restraining member and the sub restraining member is webbing.

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