JP2016222203A - Air belt device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air belt device capable of varying the amount of fluid supplied to a shoulder part of a bag body and the mount of fluid supplied to a lap part of the bag body.SOLUTION: A tube 56 of an air belt device 19 has a part, where a hole 64 is formed, arranged at a narrow-width part 48 of a bag body 38, and when tension of a cover belt 24 of a cover 22 is increased as a lap pretensioner is placed in operation, discharging of a gas from the hole 64 of the tube 56 is limited, so that much gas flows to a lengthwise tip part of the tube 56. Consequently, a shoulder part of the bag body 38 can be preferentially expanded to spread.SELECTED DRAWING: Figure 8

Description

  The present invention relates to an air belt apparatus including a bag body that is inflated by the pressure of a fluid.

  There is an air belt device in which a bag body is inflated on the vehicle front side of each of a shoulder portion, a chest portion, and a waist portion of an occupant by supplying a fluid such as gas to the bag body in a vehicle emergency (for example, Patent Document 1 below). See).

  However, in this type of air belt device, the amount of fluid supplied to the shoulder portion, which is the front portion of the occupant's shoulder and chest in the bag, and the wrap portion, which is the front portion of the occupant's waist, in the bag body. The amount of fluid supply cannot be changed.

JP 2008-247087 A

  In view of the above fact, an object of the present invention is to obtain an air belt device that can change the amount of fluid supplied to the shoulder portion of the bag and the amount of fluid supplied to the wrap portion of the bag.

  The air belt device according to claim 1 includes a shoulder portion that can be inflated on the vehicle front side of at least one of the shoulder portion and the chest portion of the occupant by the pressure of the fluid supplied to the inside, and the pressure of the fluid supplied to the inside. A bag having an inflatable wrap portion on the vehicle front side of the occupant's waist, and a changing means capable of changing the amount of fluid supplied to the shoulder portion and the amount of fluid supplied to the wrap portion. ing.

  In the air belt device according to the first aspect, the supply amount of the fluid to the shoulder portion of the bag body and the supply amount of the fluid to the wrap portion of the bag body can be changed.

  The air belt device according to claim 2 is the air belt device according to claim 1, wherein the changing means limits the amount of the fluid supplied to one of the shoulder portion and the lap portion, to the other. The supply amount of the fluid is increased.

  In the air belt device according to the second aspect, the supply amount of the fluid to one side of the shoulder portion and the lap portion of the bag body is limited by the changing means, whereby the supply amount of the fluid to the other is increased. Thereby, the supply amount of the fluid to the shoulder portion of the bag body and the supply amount of the fluid to the wrap portion of the bag body can be changed.

  The inflatable belt device according to claim 3 is the inflatable belt device according to claim 2, wherein the changing means is formed in a cylindrical shape, and a longitudinal tip portion passes through one inner side of the shoulder portion and the wrap portion. The fluid is disposed inside the other and is supplied to the inside from the longitudinal base end so that the fluid can be discharged from the longitudinal tip to the inside of the other and is formed in a portion disposed inside the one. A fluid supply member capable of discharging the fluid from the fluid discharge portion to the one inner side, and a restricting unit capable of limiting the discharge of the fluid from the fluid discharge portion of the fluid supply member. .

  In the air belt device according to claim 3, one of the shoulder portion and the wrap portion of the bag body is formed by restricting the fluid discharge from the fluid discharge portion formed in the longitudinal intermediate portion of the fluid supply member to the restriction means. The amount of fluid to be supplied to is limited. Furthermore, the amount of fluid supplied to the other of the shoulder portion and the wrap portion of the bag can be increased by restricting the fluid discharge from the fluid discharge portion of the fluid supply member to the restricting means.

  On the other hand, the restriction on the amount of fluid supplied to one of the shoulder part and the wrap part of the bag body is released by releasing the restriction on the release of the fluid from the fluid discharge part of the fluid supply member by the restricting means. . Furthermore, the restriction | limiting of the discharge | release of the fluid from the fluid discharge | release part of the fluid supply member by a restriction | limiting means is cancelled | released, The supply amount of the fluid to the other of the shoulder part of a bag body and a lap | wrap part can be reduced.

  The inflatable belt device according to claim 4 is the inflatable belt device according to claim 3, wherein the limiting means limits the discharge of the fluid from the fluid discharge portion by receiving a load on the fluid supply member side. A limiting member; and a load applying unit that, when operated, applies a load to the fluid supply member to the limiting member.

  In the inflatable belt device according to claim 4, when the load applying means is operated, the restricting member is applied with a load toward the fluid supply member by the load applying means, whereby the fluid from the fluid discharge portion of the fluid supply member is provided. Release can be limited.

  The inflatable belt device according to claim 5 is the inflatable belt device according to claim 4, wherein the limiting member is formed in a band shape, and a load is applied to the fluid supply member side by being pulled in a longitudinal direction, The load applying means is actuated to pull the restricting member in the longitudinal direction.

  In the air belt device according to the fifth aspect, when the load applying means is operated, the band-shaped limiting member is pulled in the longitudinal direction, and the limiting member is applied with a load toward the fluid supply member. Thereby, discharge | release of the fluid from the fluid discharge | release part of a fluid supply member can be restrict | limited.

  The air belt device according to claim 6 is the air belt device according to claim 5, wherein the restricting member is attached to the body of the passenger to restrain the body of the passenger.

  In the air belt device according to the sixth aspect, the occupant's body can be restrained by the restricting member by attaching the restricting member to the occupant's body.

  The inflatable belt device according to claim 7 is the inflatable belt device according to claim 6, wherein the load applying means is actuated to pull the restricting member in a longitudinal direction, thereby to increase a longitudinal tension of the restricting member. Increase the restraint force of the occupant's body by the restricting member.

  In the air belt device according to the seventh aspect, when the load applying means is operated, the restricting member is pulled in the longitudinal direction by the load applying means, and the longitudinal tension of the restricting member is increased. Thereby, the restraining force of the occupant's body by the limiting member can be increased.

  The air belt device according to claim 8 is the air belt device according to any one of claims 3 to 7, wherein the fluid discharge portion of the fluid supply member is arranged at a center side in the width direction of the bag body. Is done.

  In the inflatable belt device according to claim 8, since the fluid discharge portion of the fluid supply member is disposed at the center side in the width direction of the bag body, the gas discharged from the fluid discharge portion causes one side in the width direction of the bag body. Expansion and deployment can be made uniform on the other side.

  The air belt device according to claim 9 is the air belt device according to any one of claims 2 to 8, wherein the changing means is operated in a state where the traveling speed of the vehicle exceeds a certain value. Further, the supply amount of the fluid to the lap portion is limited, and the supply amount of the fluid to the shoulder portion is increased.

  In the air belt device according to claim 9, when the changing means is operated in a state where the traveling speed of the vehicle exceeds a certain value, the amount of fluid supplied to the lap portion of the bag body is limited by the changing means, and the bag body The amount of fluid supplied to the shoulder portion is increased. Thereby, the shoulder part of the bag can be preferentially inflated and deployed.

  The air belt device according to claim 10 is the air belt device according to any one of claims 2 to 9, wherein the changing means is operated when the traveling speed of the vehicle is not more than a predetermined value. The restriction of the supply amount of the fluid to the lap portion is released, and the supply amount of the fluid to the shoulder portion is reduced.

  In the air belt device according to claim 10, when the changing means is operated in a state where the traveling speed of the vehicle is equal to or less than a predetermined value, the restriction on the amount of fluid supplied to the wrap portion of the bag body by the changing means is released, and the bag body The amount of fluid supplied to the shoulder portion is reduced. Thereby, the wrap portion of the bag body can be preferentially inflated and deployed.

  As described above, in the air belt device according to the present invention, the amount of fluid supplied to the shoulder portion of the bag body and the amount of fluid supplied to the lap portion of the bag body can be changed.

1 is a front view of a seat belt device to which an air belt device according to an embodiment of the present invention is applied. It is a front view corresponding to FIG. 1 which shows the state by which the bag body was expanded and expand | deployed. In the top view of an air belt, (A) has shown the unfolded state of a bag, and (B) has shown the folded state of a bag. It is sectional drawing of the air belt cut | disconnected by 4-4 line | wire of FIG. 3 (B). It is sectional drawing of the air belt corresponding to FIG. 4 which shows the state by which the bag body was expanded and expand | deployed, and is sectional drawing of the air belt cut | disconnected by the 5-5 line of FIG. It is sectional drawing of the air belt cut | disconnected by 6-6 line of FIG. 3 (B). It is sectional drawing of the air belt corresponding to FIG. 6 which shows the state by which the bag body was expanded and expand | deployed, and is sectional drawing of the air belt cut | disconnected by the 7-7 line | wire of FIG. (A) is sectional drawing of the air belt cut | disconnected by the 8-8 line | wire of FIG. 3 (B), (B) shows the state which the gas and the bag and the bag body swelled in (A). It is sectional drawing corresponding to.

  Next, a seat belt device 10 to which an air belt device 19 according to an embodiment of the present invention is applied will be described with reference to FIGS. In each figure, the arrow UP indicates the vehicle upper side on which the seat belt device 10 is mounted, the arrow FR indicates the vehicle front side, and the arrow OUT indicates the vehicle width direction outer side.

<Configuration of the present embodiment>
As shown in FIG. 1, the seat belt device 10 includes a winding device 12 as a storage unit. The winding device 12 is disposed on the vehicle width direction outer side of the vehicle seat 14 and on the vehicle lower side. The winding device 12 includes a frame, and the frame of the winding device 12 is fixed to the vehicle body. A spool 16 as a winding member is rotatably supported on the frame of the winding device 12, and the spool 16 is biased by a biasing force of a biasing means such as a spiral spring in a winding direction around the central axis. It is energized.

  Furthermore, the longitudinal direction proximal end side of the webbing 18 as a connecting member is locked to the spool 16, and when the spool 16 is rotated in the winding direction, the webbing 18 is wound around the spool 16. Further, the winding device 12 includes a lock mechanism (not shown), and the lock mechanism is activated in the event of a vehicle emergency such as a vehicle collision. When the lock mechanism is activated, rotation of the spool 16 in the pulling direction opposite to the winding direction is prevented by the lock mechanism. Furthermore, the winding device 12 includes a pretensioner (not shown), and the pretensioner is activated in the event of a vehicle emergency such as a vehicle collision. When the pretensioner is activated, the spool 16 is rotated in the winding direction, whereby the webbing 18 is wound on the spool 16.

  The webbing 18 extends from the spool 16 to the upper side of the vehicle. As shown in FIGS. 3A and 3B, the air belt 20 of the air belt device 19 is formed on the front end side in the longitudinal direction of the webbing 18 (the arrow A direction side in FIGS. 3A and 3B). A long cover 22 is provided. As shown in FIG. 4, the cover 22 includes a cover belt 24 as a restricting member or a restricting member that constitutes a restricting means (further, a changing means). The front end in the longitudinal direction of the webbing 18 is stitched to the longitudinal base end (the end on the arrow B direction side in FIGS. 3A and 3B) of the cover belt 24 as a restraining member constituting the cover 22. The cover belt 24 is connected to the spool 16 by the webbing 18. The cover belt 24 is formed in a band shape, and the elongation (elongation rate with respect to a constant tensile force) of the cover belt 24 is approximately the same as that of the webbing 18.

  Further, as shown in FIG. 1, a through anchor 26 as a shoulder side support member is provided on the upper side of the winding device 12 in the vehicle. The through anchor 26 is attached to a center pillar which is an aspect of the side wall of the vehicle. A through anchor insertion hole is formed in the through anchor 26, and the cover 22 is inserted into the through anchor insertion hole of the through anchor 26 and folded back to the lower side of the vehicle. A lap pretensioner 28 that constitutes a restricting means and a changing means is provided as a load applying means on the vehicle width direction outer side of the seat 14 and on the vehicle lower side.

  The lap pretensioner 28 is fixed to the vehicle body or the seat frame of the seat 14, and the longitudinal end portion of the cover belt 24 of the cover 22 of the air belt 20 is locked to the lap pretensioner 28. The lap pretensioner 28 is electrically connected to an ECU (not shown) as a control device. When the lap pretensioner control signal output from the ECU is switched from the low level to the high level, the lap pretensioner 28 is Actuated, the longitudinal tip of the cover belt 24 is pulled by the wrap pretensioner 28.

  The ECU to which the lap pretensioner 28 is connected is electrically connected to an acceleration sensor (not shown) as a collision detection means. The acceleration sensor outputs an acceleration detection signal to the ECU. When the acceleration (deceleration) of the vehicle at the time of the vehicle collision is detected by the acceleration sensor, the acceleration detection signal output from the acceleration sensor is changed from the low level to the high level. Switch to.

  The ECU to which the lap pretensioner 28 is connected is electrically connected to a speed sensor (not shown) as speed detection means. The speed sensor outputs a speed detection signal to the ECU, and when the traveling speed of the vehicle becomes larger than a certain value, the speed detection signal output from the speed sensor is switched from the Low level to the High level.

  The ECU to which the lap pretensioner 28 is connected, the lap that is output to the lap pretensioner 28 when both the acceleration speed detection signal output from the acceleration sensor and the speed detection signal output from the speed sensor are switched to a high level. The pretensioner control signal is switched from Low level to High level.

  On the other hand, as shown in FIG. 1, a tongue 30 is provided between the through anchor 26 of the cover 22 and the lap pretensioner 28. A tongue insertion hole is formed in the tongue 30, and the cover 22 of the air belt 20 is inserted into the tongue insertion hole. For this reason, the tongue 30 can move along the cover 22. A buckle 32 is provided on the inner side in the vehicle width direction of the seat 14. The buckle 32 is fixed to the vehicle body or the frame of the seat 14, and when the tongue 30 is held by the buckle 32 in a state where the air belt 20 is hooked on the body of the occupant 34, the air belt 20 is attached to the body of the occupant 34. It is put on.

  As shown in FIG. 4, the cover 22 of the air belt 20 includes a cover stretch 36. The cover stretch 36 is formed in a band shape that is long in the longitudinal direction of the cover belt 24 of the cover 22, and the elongation of the cover stretch 36 is higher than the elongation of the cover belt 24 (that is, the cover stretch 36 is , Easier to extend than the cover belt 24). The cover stretch 36 is opposed to the cover belt 24 in the thickness direction of both the cover stretch 36 and the cover belt 24, and both end portions in the width direction of the cover stretch 36 are joined to both end portions in the width direction of the cover belt 24 by sewing. Has been. For this reason, the cover 22 is formed in a cylindrical shape opened at least at the front end portion in the longitudinal direction (the arrow A direction side in FIG. 3A).

  The cover 22 including the cover belt 24 and the cover stretch 36 is folded back at the tongue insertion hole of the tongue 30 in a state where the air belt 20 is attached to the body of the occupant 34. Therefore, as shown in FIG. 4, in a state where the air belt 20 is mounted on the body of the occupant 34, the cover stretch 36 is located between the tongue 30 and the through anchor 26 in the air belt 20 and the occupant of the cover belt 24. 34 is arranged on the opposite side. On the other hand, as shown in FIG. 6, in a state where the air belt 20 is attached to the body of the occupant 34, the cover stretch 36 is formed of the cover belt 36 in the portion between the tongue 30 and the lap pretensioner 28 in the air belt 20. 24 on the side of the occupant 34.

  Further, as shown in FIG. 3B, the cover 22 is provided with a bag body 38. The bag body 38 is formed in a strip shape that is long in the longitudinal direction of the cover 22. As shown in FIG. 4, the bag body 38 is formed in a two-layer structure including a bag body first layer 40 and a bag body second layer 42 by double weaving by bag weaving. Furthermore, the width direction both ends (end part of the arrow C direction side of FIG. 3 (A) and FIG. 4 and arrow D direction side) of the bag body 38, and the longitudinal direction base end part (FIG. 3 (A) of FIG. 3 (A). The end portions on the arrow B direction side) are joined, and both end portions in the width direction of the bag body 38 and the base end portion in the longitudinal direction of the bag body 38 have a single layer structure. Thereby, the bag body 38 is formed in a cylindrical shape or a bag shape opened at the front end portion in the longitudinal direction.

  The bag body 38 includes a wide portion 44. In the wide portion 44, the width dimension of the bag body 38 (dimensions in the arrow C direction and the arrow D direction in FIG. 3A) is larger than the width dimension of the cover belt 24 and the cover stretch 36 of the cover 22. The front end side in the longitudinal direction of the wide portion 44 of the bag body 38 is a width changing portion 46. In the width changing portion 46, the width dimension of the bag body 38 is smaller toward the front end side in the longitudinal direction of the bag body 38. It has become. The front end side in the longitudinal direction from the width changing portion 46 of the bag body 38 is a narrow portion 48. In the narrow portion 48, the width dimension of the bag body 38 is set to be equal to or less than the width dimension of the cover belt 24 and the cover stretch 36 of the cover 22, and the narrow portion 48 is in the central portion in the width direction of the wide portion 44 of the bag body 38. It arrange | positions at the longitudinal direction front end side.

  Further, as shown in FIG. 3A, the cover 22 is provided with a strap belt 50. The strap belt 50 is formed in a band shape that is long in the longitudinal direction of the cover belt 24 of the cover 22, and the elongation of the strap belt 50 is lower than the elongation of the bag body 38 and higher than the elongation of the cover belt 24. Is set. The strap belt 50 is disposed in the center of the bag body 38 in the width direction between the bag body second layer 42 of the bag body 38 and the cover stretch 36 of the cover 22. Further, the longitudinal base end portion (the end portion on the arrow B direction side in FIG. 3A) of the strap belt 50 is coupled to the cover belt 24 of the cover 22 by sewing or the like, and the strap belt 50 and the cover belt 24 are connected to each other. Is united.

  The width direction outer side part of the bag body 38 from the strap belt 50 is folded to the thickness direction side (arrow E direction side in FIGS. 4 and 6) of the strap belt 50, and in this state, the bag body 38 and the strap belt are folded. 50 is arranged in the cover 22. In a state where the air belt 20 is mounted on the body of the occupant 34, a portion between the through anchor 26 and the tongue 30 of the bag body 38 is a shoulder portion 52, which is inflated and deployed on the vehicle front side of the shoulder and chest of the occupant 34. It is possible. On the other hand, in a state where the air belt 20 is attached to the body of the occupant 34, a portion between the tongue 30 of the bag body 38 and the lap pretensioner 28 is a lap portion 54, and the vehicle front side of the waist portion of the occupant 34 It can be expanded and deployed.

  On the other hand, as shown in FIG. 1, the air belt 20 includes a tube 56 constituting a changing means as a fluid supply member. As shown in FIG. 4, the tube 56 is formed in a two-layer structure including a tube first layer 58 and a tube second layer 60 by double weaving by bag weaving. Further, both end portions in the width direction of the tube 56 (end portions on the arrow C direction side and arrow D direction side in FIGS. 3 and 4) are joined, and both end portions in the width direction of the tube 56 have a single layer structure. As a result, the tube 56 has a cylindrical shape opened at both ends in the longitudinal direction.

  The longitudinal direction base end portion (the end portion on the arrow A direction side in FIG. 3A) of the tube 56 is connected to an inflator 62 as fluid generating means or gas generating means. The inflator 62 is operated to generate a gas as a fluid. The gas generated in the inflator 62 passes through the inside of the tube 56 and is supplied to the distal end side in the longitudinal direction of the tube 56. The inflator 62 is electrically connected to the ECU (not shown) as the control device described above, and the acceleration detection signal output from the acceleration sensor (not shown) as the above-described collision detection means changes from low level to high. When the level is switched, the inflator control signal output from the ECU is switched from the low level to the high level, whereby the inflator 62 is activated.

  Furthermore, the distal end side in the longitudinal direction of the tube 56 (the arrow B direction side in FIG. 3A) enters the inner side of the bag body 38 from the distal end portion in the longitudinal direction of the bag body 38. Inside the width changing portion 46 of the bag body 38, the tube 56 extends along the width direction one side end portion (the end portion on the arrow C direction side in FIG. 3A) of the bag body 38. The tube 56 extends to the longitudinal direction proximal end side of the bag body 38 along the widthwise one side end portion of the bag body 38 inside the wide portion 44 of the bag body 38. For this reason, as shown in FIG. 4, the portion of the tube 56 disposed inside the width changing portion 46 of the bag body 38 is folded together with the width changing portion 46 of the bag body 38 toward the thickness direction side of the strap belt 50. The portions of the tube 56 that are folded and disposed inside the width changing portion 46 of the bag body 38 and inside the wide portion 44 are disposed between the strap belt 50 and the cover stretch 36 of the cover 22.

  Further, the longitudinal dimension of the tube 56 is such that when the occupant 34 having a large physique wears the air belt 20, the distal end of the tube 56 in the longitudinal direction of the bag body 38 is more than the folding position of the air belt 20 at the tongue 30. It is set so as to be arranged on the base end side in the longitudinal direction. For this reason, the gas generated in the inflator 62 and supplied to the distal end side in the longitudinal direction of the tube 56 through the inside of the tube 56 is discharged from the longitudinal distal end portion of the tube 56 to the inside of the bag body 38. As a result, a portion of the bag body 38 between the tongue 30 and the through anchor 26 is inflated and deployed.

  On the other hand, as shown in FIGS. 3A and 3B and FIGS. 8A and 8B, the tube first layer 58 of the tube 56 has a plurality of holes 64 as fluid discharge portions. Has been. The hole 64 is formed in a portion of the tube first layer 58 of the tube 56 that is disposed inside the narrow portion 48 of the bag body 38. Further, the hole 64 is formed in the tube 56 so as to be located on the front end side in the longitudinal direction in the central portion in the width direction of the wide portion 44 of the bag body 38. The hole 64 is generated by the inflator 62 so that the gas passing through the inside of the tube 56 can be discharged into the narrow portion 48 of the bag body 38.

  Here, in the narrow portion 48 of the bag body 38, the bag body 38 is sandwiched between the cover belt 24 and the strap belt 50 of the cover 22, and the hole 64 of the tube first layer 58 of the tube 56 is formed in the bag 56. It is opposed to the cover belt 24 of the cover 22 with the bag body first layer 40 of the body 38 interposed therebetween. For this reason, the cover belt 24 of the cover 22 presses the tube first layer 58 of the tube 56 through the bag first layer 40 of the bag 38 by the longitudinal tension applied to the cover belt 24.

  When the pressing load F1 of the cover belt 24 toward the tube first layer 58 side of the tube 56 is larger than the pressure F2 of the gas discharged from the hole 64 of the tube 56, the bag body first layer of the bag body 38. 40 is closely attached to the tube first layer 58 of the tube 56 so as to block the hole 64 of the tube 56.

<Operation and effect of the present embodiment>
In the seat belt device 10, the tongue 30 is gripped and pulled by the occupant 34 seated on the seat 14. Thus, the webbing 18 and the air belt 20 are drawn from the spool 16 of the winding device 12 and are wound around the body of the occupant 34 from the front side of the occupant 34 body. When the tongue 30 is held by the buckle 32 in this state, the air belt 20 is attached to the body of the occupant 34 as shown in FIG.

  In this state, when the vehicle collides, a lock mechanism provided in the winding device 12 is activated, and the spool 16 of the winding device 12 is restricted from rotating in the pull-out direction by the lock mechanism. As a result, the withdrawal of the webbing 18 from the spool 16 is restricted. The front end of the webbing 18 in the longitudinal direction is joined to the longitudinal base end of the cover belt 24 of the cover 22 of the air belt 20 by stitching, and the elongation of the cover belt 24 is approximately the same as that of the webbing 18. . For this reason, the passenger | crew's 34 body can be restrained with the cover belt 24, and it can restrict | limit effectively that the passenger | crew's 34 body is inertial-moved to the vehicle front side.

  On the other hand, when the traveling speed of the vehicle becomes larger than a certain value, the speed detection signal output from the speed sensor is switched from the Low level to the High level. In this state, when the acceleration (deceleration) of the vehicle at the time of the vehicle collision is detected by the acceleration sensor, the acceleration detection signal output from the acceleration sensor is switched from the Low level to the High level. When the high-level speed detection signal and the high-level acceleration detection signal are input to the ECU, the lap pretensioner control signal output from the ECU is switched from the low level to the high level.

  Thus, at the time of a high-speed collision that is a vehicle collision in a state where the traveling speed of the vehicle is larger than a certain value, the lap pretensioner 28 is operated, and the cover belt 24 of the cover 22 is moved in the longitudinal direction of the cover 22 by the lap pretensioner 28. Pulled to the tip side. As a result, the tension of the cover belt 24 of the cover 22 is increased, the body of the occupant 34 can be restrained more strongly by the cover belt 24, and the body of the occupant 34 can be more effectively restricted from inertial movement toward the front side of the vehicle. .

  When a high-level acceleration detection signal is input to the ECU, the inflator control signal output from the ECU is switched from the low level to the high level, whereby the inflator 62 is activated and gas is generated in the inflator 62. Is done. The gas generated in the inflator 62 is sent from the longitudinal base end of the tube 56 to the inside of the tube 56. Further, the gas sent to the inside of the tube 56 flows to the distal end side in the longitudinal direction of the tube 56 and is discharged from the distal end portion in the longitudinal direction of the tube 56 to the inside of the bag body 38.

  Since the distal end portion of the tube 56 in the longitudinal direction is arranged on the proximal end side in the longitudinal direction of the bag body 38 relative to the folding position of the air belt 20 at the tongue 30, the tube 56 is discharged from the distal end portion in the longitudinal direction of the tube 56 to the inside of the bag body 38. The gas thus expanded inflates a portion of the bag body 38 between the tongue 30 and the through anchor 26.

  By the way, since the hole 64 is formed in the part arrange | positioned inside the narrow part 48 of the bag body 38 in the tube 1st layer 58 of the tube 56, the gas which passes the inside of the tube 56 is the hole 64. To the outside of the tube 56. Here, when the gas passes through the inside of the tube 56, if the cover belt 24 of the cover 22 is pulled to the front end side in the longitudinal direction of the cover 22 by the wrap pretensioner 28, the cover belt 24 is the bag of the bag body 38. The tube 56 is strongly pressed to the tube first layer 58 through the body first layer 40.

  If the pressure load F1 of the cover belt 24 applied to the tube first layer 58 of the tube 56 is greater than the pressure F2 of the gas that tends to exit the tube 56 from the hole 64 of the tube 56, the bag of the bag body 38 The body first layer 40 is in close contact with the tube first layer 58 of the tube 56, the hole 64 of the tube 56 is blocked by the bag body first layer 40 of the bag body 38, and the gas from the hole 64 of the tube 56 is Is prevented or suppressed. As a result, in the high-speed collision state in which the vehicle is collided with the vehicle traveling speed being larger than a certain value, the expansion of the bag body 38 in the portion between the tongue 30 and the lap pretensioner 28 can be prevented or suppressed, A lot of gas can be sent to the longitudinal tip of the tube 56 and the bag 38 can be preferentially inflated between the tongue 30 and the through anchor 26.

  In a state where the air belt 20 is attached to the body of the occupant 34, a portion between the tongue 30 and the through anchor 26 of the bag body 38 is disposed as a shoulder portion 52 on the shoulder and chest of the occupant 34 on the front side of the vehicle. For this reason, at the time of high-speed collision, the shoulder portion 52 of the bag body 38 can be preferentially inflated. When the bag body 38 is inflated in this way, the stitched portion between the width direction both ends of the cover belt 24 of the cover 22 and the width direction both ends of the cover stretch 36 is broken. As a result, as shown in FIGS. 2 and 5, the shoulder portion 52 of the bag body 38 is deployed on the vehicle front side of the shoulder and chest of the occupant 34.

  Both end portions in the width direction of the deployed bag body 38 are disposed on the outer side in the width direction than the cover belt 24 of the cover 22. For this reason, on the outer side in the width direction of the cover belt 24, the body of the occupant 34 can abut against the bag body 38, whereby an area that receives a load from the shoulder and chest of the occupant 34 that is about to move to the front side of the vehicle. The load which the shoulder part and chest part of the passenger | crew 34 receive from the vehicle front side can be disperse | distributed.

  On the other hand, when the traveling speed of the vehicle is below a certain value, the speed detection signal output from the speed sensor is maintained at the low level. In this state, even if the acceleration detection signal output from the acceleration sensor is switched from the Low level to the High level, the lap pretensioner control signal output from the ECU is maintained at the Low level. For this reason, the lap pretensioner 28 is not actuated at the time of a low-speed collision that is a vehicle collision when the traveling speed of the vehicle is a certain value or less.

  In this state, the cover belt 24 of the cover 22 is not pulled to the front end side in the longitudinal direction by the wrap pretensioner 28, so that the cover belt 24 is connected to the tube first of the tube 56 via the bag body first layer 40 of the bag body 38. The layer 58 is not strongly pressed. For this reason, the pressing load F1 of the cover belt 24 to the tube first layer 58 of the tube 56 is equal to or lower than the pressure F2 of the gas that tries to go out of the tube 56 from the hole 64 of the tube 56, and this gas pressure F2 As a result, the bag first layer 40 of the bag body 38 and the cover belt 24 of the cover 22 are separated from the tube first layer 58 of the tube 56, and the gas in the tube 56 moves from the hole 64 of the tube 56 to the inside of the bag body 38. Released.

  As described above, the gas flowing in the longitudinal tip of the tube 56 is eliminated or reduced by releasing the gas in the tube 56 from the hole 64 of the tube 56. Accordingly, the expansion of the bag body 38 can be prevented or suppressed between the tongue 30 and the through anchor 26, and a large amount of gas can be released from the hole 64 of the tube 56, so that the bag is interposed between the tongue 30 and the lap pretensioner 28. The body 38 can be preferentially inflated.

  In a state where the air belt 20 is attached to the body of the occupant 34, a portion between the tongue 30 and the through anchor 26 of the bag body 38 is disposed as a lap portion 54 on the front side of the vehicle at the waist of the occupant 34. Therefore, at the time of a low-speed collision, the lap portion 54 of the bag body 38 can be preferentially inflated and deployed, and the waist portion of the occupant 34 can be held by the inflated and deployed wrap portion 54 of the bag body 38. It is possible to effectively prevent or suppress the occurrence of a so-called “submarine phenomenon” that is moved to the vehicle front side through the vehicle lower side of the bag body 38.

  Thus, in the present embodiment, at the time of high-speed collision, the gas supply amount to the shoulder portion 52 of the bag body 38 can be made larger than the gas supply amount to the lap portion 54 of the bag body 38, and the bag body 38. The shoulder portion 52 can be preferentially expanded and expanded. Further, at the time of a high-speed collision, the amount of gas supplied to the wrap portion 54 of the bag body 38 can be made larger than the amount of gas supplied to the shoulder portion 52 of the bag body 38, and the wrap portion 54 of the bag body 38 is given priority. Can expand and expand.

  Further, the hole 64 of the tube first layer 58 of the tube 56 is located on the distal end side in the longitudinal direction in the center portion in the width direction of the wide portion 44 of the bag body 38. For this reason, when the gas released from the hole 64 to the inside of the bag body 38 flows through the width changing portion 46 of the bag body 38 to the wide portion 44 of the bag body 38, the width changing portion 46 and the wide width of the bag body 38. Both the width direction one side part and the width direction other side part (namely, the part folded in the thickness direction side of the strap belt 50 in the width change part 46 and the wide part 44) of the part 44 are expanded and expanded. . Thereby, the width direction both sides of the width change part 46 and the wide part 44 of the bag body 38 can be uniformly expanded and expanded.

  Further, in the present embodiment, the body of the occupant 34 is restrained by the cover belt 24 of the cover 22 in a state where the cover 22 constituting the air belt 20 of the air belt device 19 is attached to the body of the occupant 34. Release of gas from the hole 64 of the tube first layer 58 of the tube 56 is restricted by the cover belt 24 which is a restraining member for restraining the body of the passenger 34. For this reason, in order to restrict | release the discharge | release of the gas from the hole 64 of the tube 56, it is not necessary to provide a member different from the cover 22, it is low-cost, and size reduction and thickness reduction of the air belt 20 are possible. become.

  Further, the lap pretensioner 28 is actuated to pull the cover belt 24 of the cover 22, thereby increasing the longitudinal tension of the cover belt 24 and strongly restraining the occupant 34 body by the cover belt 24. . By pulling the cover belt 24 of the cover 22 by such a wrap pretensioner 28, the release of gas from the hole 64 of the tube first layer 58 of the tube 56 is limited. For this reason, the structure which gives the tension | tensile_strength of a longitudinal direction and the load to the tube 56 side to the cover belt 24 only in order to restrict | limit the discharge | release of the gas from the hole 64 of the tube 56 is unnecessary. Therefore, the cost is low, and the configuration of the air belt device 19 can be simplified and downsized.

  Further, in the present embodiment, the elongation of the strap belt 50 is higher than that of the cover belt 24 of the cover 22. For this reason, the strap belt 50 can be extended by the expansion and deployment of the bag body 38, and the bag body 38 can be sufficiently expanded and expanded by extending the strap belt 50 in this manner.

  On the other hand, in this embodiment, the elongation of the cover belt 24 of the cover 22 coupled to the webbing 18 is lower than that of the strap belt 50. Moreover, the cover belt 24 is positioned between the tongue 30 and the through anchor 26 on the side of the occupant 34 of the inflated and deployed bag body 38. For this reason, the cover belt 24 does not stretch even when a load is applied from the body of the occupant 34 to the front side of the vehicle. As a result, the body of the occupant 34 trying to move to the front side of the vehicle can be restrained by the cover belt 24.

  In the present embodiment, the portion where the hole 64 is formed in the tube 56 is arranged in the narrow portion 48 of the bag body 38. However, if the longitudinal end portion of the tube 56 is arranged in the shoulder portion 52 of the bag body 38, the portion where the hole 64 is formed in the tube 56 is in the wrap portion 54 of the bag body 38. Any arrangement may be used.

  In the present embodiment, the tube 56 is inserted into the bag body 38 from the longitudinal tip portion (the end portion on the arrow A direction side in FIG. 3A) of the bag body 38, and the longitudinal tip portion of the tube 56 is inserted. (The end on the arrow B direction side in FIG. 2) was arranged in the shoulder portion 52 of the bag body 38. However, the tube 56 is inserted into the bag body 38 from the longitudinal base end portion of the bag body 38 (the end portion on the arrow B direction side in FIG. 3A), and the longitudinal tip portion of the tube 56 (FIG. 3A). ) In the arrow A direction side) may be arranged in the wrap portion 54 of the bag body 38.

  Further, in the present embodiment, a single tube 56 is used, and a hole 64 as a fluid discharge portion is formed in the tube 56, and gas is supplied to both the shoulder portion 52 and the wrap portion 54 of the bag body 38. It was set as the structure which can be supplied. However, for example, a first tube whose longitudinal tip is disposed in the shoulder portion 52 of the bag 38 and a second tube whose longitudinal tip is disposed in the wrap portion 54 of the bag 38 are provided. It is possible to provide the gas supply amount to the first tube and the second tube with a valve body or the like, and supply the gas to the inside of each of the shoulder portion 52 and the wrap portion 54 of the bag body 38. Various configurations can be applied to the configuration.

  In the present embodiment, the longitudinal end portion of the cover belt 24 of the cover 22 is connected to the lap pretensioner 28, and the cover belt 24 is pulled by the activated lap pretensioner 28. However, the lap pretensioner 28 may be connected to the buckle 32 on the inner side in the vehicle width direction of the seat 14, and the buckle 32 may be pulled downward by driving the lap pretensioner 28.

  Further, in the present embodiment, the cover belt 24 of the cover 22 is used as the limiting member. However, a configuration may be adopted in which a limiting member is provided separately from the cover belt 24 for restraining the body of the occupant 34.

  Further, in the present embodiment, the lap pretensioner 28 that pulls the cover belt 24 of the cover 22 and increases the body restraining force of the occupant 34 by the cover belt 24 is used as the load applying means. However, in addition to such a wrap pretensioner 28, a load applying means for applying a pressing load F1 for limiting the release of gas from the hole 64 of the tube 56 to the cover belt 24 may be provided.

  Furthermore, in the present embodiment, the amount of gas discharged from the hole 64 of the tube 56 is limited, so that the amount of gas supplied into the wrap portion 54 of the bag body 38 is limited. The amount of gas supplied into the shoulder portion 52 is increased, and the restriction on the amount of gas released from the hole 64 of the tube 56 is released, thereby limiting the amount of gas supplied into the lap portion 54 of the bag body 38. Is released, and the supply amount of gas into the shoulder portion 52 of the bag body 38 is limited and lowered. However, for example, the amount of gas supplied to the inside of each of the shoulder portion 52 and the wrap portion 54 of the bag body 38 is individually controlled, whereby the inside of each of the shoulder portion 52 and the wrap portion 54 of the bag body 38 is controlled. The supply amount of the gas may be changed, and the supply amount of the gas to the other side is increased by limiting the supply amount of the gas to one of the shoulder portion 52 and the lap portion 54 of the bag body 38. It does not have to be a configuration to be made.

19 Air belt device 24 Cover belt (restricting member, restricting means, changing means)
28 Lap pretensioner (loading means, limiting means, changing means)
38 bag body 52 shoulder part 54 lap part 56 tube (fluid supply member, changing means)
64 holes (fluid discharge part)

Claims (10)

A shoulder portion that can be inflated on the vehicle front side of at least one of a shoulder portion and a chest portion of the occupant by the pressure of fluid supplied to the inside, and can be inflated on the vehicle front side of the lumbar portion of the occupant by the pressure of fluid supplied to the inside. A bag body having a wrapping portion,
Change means capable of changing the supply amount of the fluid to the shoulder portion and the supply amount of the fluid to the lap portion;
An air belt device comprising:   2. The air belt device according to claim 1, wherein the changing unit increases a supply amount of the fluid to the other by restricting a supply amount of the fluid to one of the shoulder portion and the lap portion. The changing means is
Formed in a cylindrical shape, the longitudinal tip is disposed inside the other of the shoulder portion and the wrap portion, and the fluid supplied to the inside from the longitudinal base end portion is supplied to the longitudinal tip portion. A fluid supply member that is capable of being discharged from the fluid inside to the other side, and that is capable of discharging the fluid from the fluid discharge portion formed in a portion disposed inside the one side to the inside of the one side;
Limiting means capable of limiting discharge of the fluid from the fluid discharge portion of the fluid supply member;
An air belt device according to claim 2, comprising: The limiting means is
A limiting member that limits the discharge of the fluid from the fluid discharge portion by receiving a load on the fluid supply member side;
A load applying means for applying a load on the fluid supply member side to the restricting member by being actuated;
An air belt device according to claim 3.   The restriction member is formed in a band shape, and a load is applied to the fluid supply member side by being pulled in a longitudinal direction, and the load applying means pulls the restriction member in a longitudinal direction by being actuated. 4. The air belt device according to 4.   The air belt device according to claim 5, wherein the restriction member restrains the occupant's body by being attached to the occupant's body.   The load applying means is actuated to pull the restricting member in a longitudinal direction, thereby increasing a longitudinal tension of the restricting member and increasing a restraining force of the occupant body by the restricting member. The inflatable belt device described in 1.   The air belt device according to any one of claims 3 to 7, wherein the fluid discharge portion of the fluid supply member is disposed on a center side in the width direction of the bag body.   The change means limits the supply amount of the fluid to the lap portion and increases the supply amount of the fluid to the shoulder portion when the vehicle is operated in a state where the traveling speed of the vehicle exceeds a certain value. The inflatable belt device according to any one of claims 2 to 8.   The change means releases the restriction on the supply amount of the fluid to the lap portion and lowers the supply amount of the fluid to the shoulder portion when the vehicle is operated in a state where the traveling speed of the vehicle is a predetermined value or less. The inflatable belt device according to any one of claims 2 to 9.

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