JP5239604B2 - Crew restraint system - Google Patents

Description

  The present invention relates to an occupant restraint device in which an airbag is disposed along a seat belt of a vehicle, and in particular, includes a sheath member through which the seat belt is movably inserted, and the airbag is disposed so as to surround the sheath member. The present invention relates to an occupant restraint device.

  As an occupant restraint device that restrains an occupant in the event of a vehicle collision or the like, it is well known to arrange an inflatable airbag along a vehicle seat belt.

  Japanese Patent No. 3521769 describes an occupant restraint device in which an airbag has a hollow cylindrical shape having a belt insertion hole through which a seat belt is inserted, and a shoulder belt portion of the seat belt is inserted into the belt insertion hole. Yes. The airbag is attached to the upper part of the vehicle seat back, and the airbag inflates toward the passenger compartment door side of the occupant's head along the shoulder belt portion when the vehicle collides. The seat belt can be pulled out and wound up through the belt insertion hole of the airbag.

In FIGS. 35 and 36 and [0152] to [0156] paragraphs of the same number, the seat belt is inserted into a rectangular tubular sheath member (referred to as “shoulder belt penetration part 172” in the same number). A configuration is described in which an airbag is disposed so as to surround the shoulder belt penetration portion, and the airbag is surrounded by a rectangular tube-shaped cover portion (reference numeral 174 in the same publication). This shoulder belt penetration part is attached to the upper part of the seat back together with the airbag. The shoulder belt penetrating portion prevents the airbag from being damaged due to friction between the seat belt and the airbag when the seat belt is pulled out and wound. The cover portion is provided with a thin portion that is broken when the airbag is deployed.
Japanese Patent No. 3521769

  Since the shoulder belt penetrating portion and the cover portion of the above-mentioned Japanese Patent No. 3521769 are in the shape of a rectangular tube, they have high rigidity and are substantially rigid and hardly deform.

  Such a rigid shoulder belt penetrating portion and cover portion protrude forward from the upper portion of the seat back, and become an obstacle when getting on and off the vehicle seat.

  Further, if the shoulder belt penetrating portion and the cover portion are rigid, the shape does not conform to the upper body of the occupant body such as the shoulder of the occupant body.

  The present invention includes a sheath member having a belt insertion portion through which a vehicle seat belt is movably inserted, an airbag arranged to surround the sheath member, and an inflator for inflating the airbag. It is an object of the present invention to provide an occupant restraint device in which the sheath member is easily bent.

An occupant restraint device according to the present invention (Claim 1) includes a sheath member having a belt insertion portion through which a vehicle seat belt is movably inserted, an airbag disposed so as to surround the sheath member, and the air bag. in the occupant restraint apparatus having an inflator for inflating the bag, a multiply-membered restraint device having a deformable portion in the sheath member, to the sheath member, for attachment to the top of the seat back of the vehicle seat An attachment portion is provided, and the airbag is arranged on a side of a head of an occupant seated on a vehicle seat in an inflated state, and the attachment portion rotates the sheath member. It has the rotation permission member to permit .
An occupant restraint device according to the present invention (Claim 2) includes a sheath member having a belt insertion portion through which a seat belt of a vehicle is movably inserted, an airbag disposed so as to surround the sheath member, and the airbag An occupant restraint device including an inflator for inflating a bag, the occupant restraint device having an easily deformable portion in the sheath member, the attachment for attaching the sheath member to an upper portion of a seat back of a vehicle seat The airbag is disposed on a side of the head of an occupant seated on a vehicle seat in an inflated state, and the airbag is disposed along the occupant. 1 bag, a 2nd bag arrange | positioned at a passenger | crew head side, and the 3rd bag arrange | positioned on the opposite side to a passenger | crew head rather than this 2nd bag, It is characterized by the above-mentioned. To do.

Occupant restraint system according to claim 3, in claim 1 or 2, wherein the sheath is characterized in that it is made of synthetic resin.

The occupant restraint device according to claim 4 is the occupant restraint device according to any one of claims 1 to 3 , wherein the sheath member extends in a seat belt insertion direction, and the easily deformable portion is at least on an outer surface of the sheath member. A part of the groove is a recess or a notch extending in the crossing direction with the extending direction.

The occupant restraint device according to claim 5 is the occupant restraint device according to claim 4 , wherein the sheath member has a flat shape having a first outer surface facing the occupant and a second outer surface opposite to the first outer surface. The cut is provided in at least the second outer surface.

The occupant restraint device of claim 6 is characterized in that, in claim 5 , a plurality of the recesses or cuts are provided at intervals in the extending direction of the sheath member.

An occupant restraint device according to a seventh aspect is the vehicle occupant restraint device according to any one of the first to sixth aspects, wherein an intermediate position of the vehicle seat in the left-right direction is the middle of the sheath member in the left-right direction when the airbag is inflated. It is characterized by being positioned closer to the occupant head than the position.

  In the occupant restraint device of the present invention, since the easily deformable portion is provided in the sheath member, the sheath member follows the occupant's body shape and body movement when the seat belt is attached and detached or when the seat belt is worn. And can be easily deformed. Thereby, the operativity at the time of seat belt attachment or detachment and the comfort in a seat belt wearing state become favorable. Moreover, it is prevented that it gets in the way when getting on and off the vehicle seat.

As in claim 3 , the sheath member is preferably made of synthetic resin from the viewpoint of durability.

As in claim 4 , the easily deformable portion can be simply configured by providing the outer surface of the sheath member with a recess or a cut.

As in claim 5 , the sheath member has a flat shape having a first outer surface facing the occupant and a second outer surface opposite to the first outer surface, thereby reducing the thickness of the sheath member. The occupant restraint device can be made thin as a whole. Further, since the occupant's body outer surface is curved convexly as a whole, at least the second outer surface on the side opposite to the occupant is provided with a recess or incision so that the second outer surface is compared to the first outer surface. Since it becomes easy to extend | expand, a sheath member comes to curve smoothly along a passenger | crew's body outer surface.

  In the present invention, "the sheath member has a flat shape having a first outer surface facing the occupant and a second outer surface opposite to the first outer surface" means that the first and second outer surfaces are the same. It means that the width in the direction orthogonal to the belt insertion direction is larger than the width in the direction orthogonal to the belt insertion direction on the side surface of the sheath member connecting both side edges of the first and second outer surfaces.

As in claim 6 , by providing a plurality of recesses or incisions at intervals in the extending direction of the sheath member, the sheath member as a whole is easily deformed along the body outer surface of the occupant.

In the present invention , the movement of the occupant's head in the lateral direction can be restricted by the inflated airbag.

In the aspect of Claim 1 , since the sheath member is rotatably attached to the seat back, the operability when the seat belt is attached and detached and the comfort in the seat belt wearing state are improved.

According to the aspect of the seventh aspect, when the airbag is inflated, the airbag approaches the occupant head as a whole, so that the lateral movement of the occupant head can be restrained early.

In the aspect of Claim 2 , the reaction force characteristic at the time of expansion | swelling as the whole airbag can be changed by changing the internal pressure at the time of expansion | swelling of each bag.

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

  1 is a perspective view of a vehicle seat provided with an occupant restraint device according to an embodiment, FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1, and FIG. 3 (a) is FIG. Sectional view taken along line III-III, FIG. 3 (b) is an enlarged sectional view of the same part as FIG. 3 (a) of the sheath member 20, FIG. 4 is a perspective view of the sheath member, and FIG. 5 (a). , (B) is a sectional view taken along the line V-V in FIG. 4, FIG. 5 (c) is an enlarged view of a portion C in FIG. 5 (a), FIG. 6 is an exploded perspective view of the airbag, 7 is a plan view of the first bag and the sheath member of the airbag, FIG. 8 is a sectional view of the same portion as FIG. 3 (a) when the airbag is inflated, and FIG. 9 is a side view when the airbag is inflated. Fig. 10 (a) is a perspective view of the airbag adapter, Fig. 10 (b) is a front view of the airbag adapter, and Fig. 11 is a side view of the side airbag when inflated.

  FIG. 5 (a) shows a state where the sheath member extends straight, and FIG. 5 (b) shows a state where the sheath member is curved and extended.

  In this embodiment, an occupant restraint device installed in a seat will be described on the left side of the passenger compartment (the left-right direction coincides with the left-right direction for an occupant seated in the seat. The same applies hereinafter). Although illustration is omitted, the configuration of the passenger restraint device for the right seat in the passenger compartment is a configuration in which the configuration of the passenger restraint device for the left seat is reversed left and right.

  A vehicle seat 1 includes a seat cushion 2 and a seat back 3 rising from a rear portion of the seat cushion 2. A headrest 4 is installed at the center in the left-right direction above the seat back 3.

  In this embodiment, a seat belt outlet 5 is provided integrally with the seat back 3 on the side of the passenger compartment door on the upper portion of the seat back 3 (that is, on the left side in this embodiment). Specifically, in this embodiment, a convex portion 5a protruding upward from the passenger compartment door side of the upper portion of the seat back 3 is provided. As shown in FIG. 2, the convex portion 5a has a hollow box shape, and its front side is open. The front opening opening of the convex portion 5 a is a seat belt outlet 5. A seat belt 10 is pulled out from the seat belt outlet 5 to the front side of the seat 1. Reference numeral 5b denotes a guide roller provided in the convex portion 5a, and a middle portion of the seat belt 10 is hung on the guide roller 5b.

  As shown in FIG. 2, in this embodiment, a seat belt retractor 6 is installed in the seat back 3, and the base end side of the seat belt 10 is connected to the seat belt retractor 6 so that the seat belt 10 can be pulled out and wound. ing. The seat belt 10 is drawn from the seat belt retractor 6 to the seat belt outlet 5 through a belt passage (not shown) formed in the seat back 3.

  The front end of the seat belt 10 is connected to a vehicle body or a seat frame (not shown) or the like by a lap anchor 7 on the passenger compartment door side of the seat cushion 2. A portion of the seat belt 10 between the lap anchor 7 and the seat belt outlet 5 is inserted into a belt insertion port of a tongue (not shown). A buckle device (not shown) for latching the tongue is installed on the center side of the passenger compartment of the seat cushion 2. In the state of FIG. 1 in which the tongue is latched by the buckle device, the seat belt pull-out port 5 side of the seat belt 10 is the shoulder belt portion 11, and the lap anchor 7 side of the tongue is the lap belt portion 12. is there.

  The seat belt 10 is made of a normal non-expandable belt material.

  In this embodiment, the seat belt retractor 6 is provided with a pretensioner (not shown) that winds up the seat belt 10 and applies tension to the seat belt 10 when the vehicle collides. In addition, as a pretensioner, you may use what was comprised so that tension | tensile_strength might be applied to the seatbelt 10 by pulling down the said buckle apparatus at the time of a vehicle collision.

  The occupant restraint device includes a sheath member 20 having a belt insertion portion 21, an airbag 30 disposed so as to surround the sheath member 20, an inflator 40 for inflating the airbag 30, and folded air. An airbag cover 50 or the like covering the bag 30 is provided.

  In this embodiment, the sheath member 20 has a cylindrical shape whose both ends are open, and the inner cavity portion serves as a belt insertion portion 21. The shoulder belt portion 11 of the seat belt 10 is movably inserted into the belt insertion portion 21.

  As shown in FIG. 3 (a) and the like, in this embodiment, the sheath member 20 has a substantially rectangular shape with a flat cross section perpendicular to the axial direction, and the long side direction of the rectangle. These shoulder belts 11 surround the shoulder belt part 11 so as to be along the passenger side and the anti-crew side of the shoulder belt part 11, respectively. That is, in this embodiment, the sheath member 20 has a flat shape having a first outer surface 22 facing the occupant and a second outer surface 23 opposite to the first outer surface 22.

  In this embodiment, the sheath member 20 is made of synthetic resin. Even when the airbag 30 is inflated around the sheath member 20, the sheath member 20 has such a rigidity that it is not crushed by the inflation pressure of the airbag 30. As the material of the sheath member 20, polypropylene resin, polyacetal resin, polyamide resin, polycarbonate resin, and the like are suitable. However, the material of the sheath member 20 is not limited to this.

  The sheath member 20 is provided with an easily deformable portion that allows the sheath member 20 to be deformed following the bending or twisting of the shoulder belt portion 11. In this embodiment, the easily deformable portion is configured by a recess 24 extending on the outer surface of the sheath member 20 in a direction orthogonal to the axial direction of the sheath member 20. In this embodiment, a plurality of concave strips 24 are provided on both surfaces of the first outer surface 22 and the second outer surface 23 of the sheath member 20 at intervals in the axial direction of the sheath member 20. ing. As shown in FIG. 5 (a) and the like, in this embodiment, the recess 24 has a V-shaped groove shape, but the shape of the recess 24 is not limited to this. Further, the easily deformable portion may be formed by making a cut in the outer surface of the sheath member 20 in a direction orthogonal to the axial direction of the sheath member 20.

  The interval between the concave stripes 24 is preferably 10 to 60 mm, particularly preferably 20 to 30 mm. Further, as shown in FIG. 5 (c), in the state in which the sheath member 20 is extended in a straight line, the width W in the direction perpendicular to the extending direction of each recess 24 is 0 to 1 mm, particularly 0. It is preferable that it is -0.5mm. Note that the width W in the direction orthogonal to the extending direction of the recess 24 is 0 mm when the sheath member 20 extends in a straight line and the wall surfaces 24 a and 24 b on both sides of the recess 24 are in contact with each other. That is, the easily deformable portion is formed by cutting.

  Each concave line (or incision; hereinafter the same) 24 may reach the belt insertion portion 21. Each recess 24 may be formed so as to go around to the side surface connecting both side edges of the first outer surface 22 and the second outer surface 23 of the sheath member 20. Each concave line 24 may go around the outer periphery of the sheath member 20. In this case, the recess 24 may be wound around the outer periphery of the sheath member 20 in a spiral shape. The first outer surface 22 and the second outer surface 23 may be different in the number and arrangement of the concave stripes 24.

  In the present invention, the recess 24 may be provided only on one of the first outer surface 22 and the second outer surface 23 of the sheath member 20. In this case, since the outer surface of the occupant's body is a curved surface that is convexly curved as a whole, it is preferable to provide the recess 24 on the second outer surface 23 on the opposite side of the occupant. By doing in this way, since the 2nd outer surface 23 becomes easy to extend compared with the 1st outer surface 22, sheath member 20 comes to bend and bend smoothly smoothly along a crew member's body outer surface.

  The length of the sheath member 20 in the axial center line direction is preferably 300 to 600 mm, particularly 400 to 500 mm.

As shown in FIG. 3 (b), the width S ₁ of the belt thickness direction of the belt insertion portion 21, within the belt insertion portion 21, and the passenger side or opposite-to-occupant side face of the shoulder belt portion 11, to It is preferable that the gap g1 is preferably 0 to 10 mm, particularly preferably _{1 to} 4 mm, between the inner surface 21a or 21b of the belt insertion portion 21 facing each other. The width S ₂ in the belt width direction of the belt insertion portion 21, within the belt insertion portion 21, and opposite side edges of the shoulder belt portion 11, the inner surface 21c or 21d of the belt insertion portion 21 facing thereto It is preferable that the gap g2 is preferably 0 to 10 mm, particularly preferably _{2 to} 5 mm.

By setting the width S ₁ in the belt thickness direction and the width S ₂ in the belt width direction in the belt insertion portion 21 to such dimensions, the shoulder belt portion 11 is folded or deformed in the belt insertion portion 21. The shoulder belt portion 11 is held in a state of extending straight.

  An attachment portion 25 for attaching the sheath member 20 to the seat back 3 is provided at the end of the sheath member 20 on the seat belt outlet 5 side. Hereinafter, the seat belt outlet 5 side of the sheath member 20 is referred to as a rear end side, and the opposite side is referred to as a front end side. The attachment portion 25 is rotatably connected to the rear end side of the sheath member 20 via a shaft pin 25a as a rotation allowing member. The axial direction of the shaft pin 25a is a direction that penetrates the first outer surface 22 and the second outer surface 23.

  In this embodiment, an airbag adapter 60 is attached to the seat belt outlet 5. The airbag adapter 60 has a plate-like shape that covers the seat belt outlet 5, and a belt passage 61 is provided in the vicinity of the approximate center of the plate surface. As shown in FIG. 2, the sheath member 20 is disposed so that the rear end opening of the belt insertion portion 21 faces the belt passage 61, and the attachment portion 25 (not shown in FIG. 2) is fixed to a bolt or the like. It is fixed to the airbag adapter 60 with a tool (not shown).

  As shown in FIGS. 10 (a) and 10 (b), in this embodiment, the belt passage 61 has a slit-like shape extending substantially in the left-right direction, and the sheath member 20 has its first shape. The rear end edges of the outer surface 22 and the second outer surface 23 are connected to the airbag adapter 60 in such a posture as to extend substantially in the left-right direction along the lower edge and upper edge of the belt passage 61, respectively. The shaft pin 25a is disposed so that its axial center line direction is substantially vertical, and the sheath member 20 is rotated substantially horizontally with respect to the airbag adapter 60 via the shaft pin 25a and the attachment portion 25. It is mounted movably.

  The seat belt 10 is drawn from the belt outlet 5 into the belt insertion part 21 of the sheath member 20 through the belt passage 61 of the airbag adapter 60.

  As shown in FIGS. 10 (a) and 10 (b), from the front surface of the airbag adapter 60, tubular first, to which gas inlets 36 of bags 31, 32, and 33 of an airbag 30 described later are respectively connected. Second and third bag connection ports 62a, 62b, and 62c are projected. The first bag connection port 62c is disposed on the lower side of the belt passage port 61, and the second and third bag connection ports 62a and 62b are disposed on the upper side of the belt passage port 61 with a space left and right. Yes. The first bag connection port 62a is located on the intermediate side in the left-right direction of the airbag adapter 60 with respect to the second and third bag connection ports 62b and 62c.

  As shown in FIG. 10 (b), a gas inlet 63 is formed on the lower end surface of the airbag adapter 60. In addition, a gas passage 64 is formed in the airbag adapter 60 to guide gas from the gas inlet 63 to the bag connection ports 62a to 62c. An inflator 40 is connected to the gas inlet 63 via a duct 41. When the inflator 40 performs gas ejection operation, gas is supplied to the bags 31 to 33 through the duct 41, the gas inlet 63, the gas passage 64, and the bag connection ports 62a to 62c.

In this embodiment, as shown in Figure 10 (b), the inner diameter _{R 1} of the first bag connection port 62a, the second and third bag connection opening 62b, than the inner diameter _{R 2} of 62c It is small. Thereby, the amount of gas flowing into the first bag 31 through the first bag connection port 62a passes through the second and third bag connection ports 62b and 62c, and the second and third bags 32 and 33 are supplied. It is comprised so that it may become smaller than the gas quantity which flows in into.

  As shown in the sixth and eighth embodiments, in this embodiment, the airbag 30 includes a first bag 31 disposed along the first outer surface 22 side of the sheath member 20, that is, along the shoulder upper surface of the occupant. The second bag 32 disposed on the occupant head side of the sheath member 20 and the third bag 33 disposed on the opposite side of the second bag 32 across the sheath member 20, that is, on the vehicle compartment door side. And is composed of.

  Each of the bags 31 to 33 has two substantially rectangular or substantially elliptical base fabrics 34a and 33b constituting the surface on the side of the sheath member 20 and the surface on the opposite side when the bags 31 to 33 are inflated. The peripheral portions of the two are joined together by sewing or the like to form a bag. Reference numeral 35 denotes a seam made of a sewing thread or the like obtained by sewing the peripheral portions of the base fabrics 34a and 34b.

  Each of the bags 31 to 33 is arranged such that each longitudinal direction is parallel to the extending direction of the sheath member 20. The length of the sheath member 20 is equal to or longer than the width in the longitudinal direction when the bags 31 to 33 are not inflated.

  A gas inlet 36 for introducing gas into each of the bags 31 to 33 is provided at an end (hereinafter referred to as a rear end) of each bag 31 to 33 on the seat belt outlet 5 side. . Although illustration is omitted, in the first bag 31, the gas inlet 36 is arranged at a position closer to the compartment door than the center in the left-right direction at the rear end of the bag 31. In the second bag 32 and the third bag 33, each gas introduction port 36 is arranged on the lower end side from the center in the vertical direction of the rear ends of the bags 32 and 33.

  The gas introduction port 36 of the first bag 31 is connected to the first bag connection port 62 a of the airbag adapter 60, and the gas introduction port 36 of the second bag 32 is connected to the second bag connection of the airbag adapter 60. The gas introduction port 36 of the third bag 33 is connected to the port 62b, is connected to the third bag connection port 62c of the airbag adapter 60, and is bound by a hose band (not shown) or the like.

  In this embodiment, the occupant head side edge of the first bag 31 and the lower part of the second bag 32 are joined together by stitching or the like, and the second bag 32 and the third bag 33 are connected to each other. The upper parts are joined together by stitching or the like, and the lower part of the third bag 33 and the edge of the first bag 31 on the vehicle compartment door side are joined together by stitching or the like. Reference numerals 37a, 37b, and 37c indicate seams made of sewing bags or the like obtained by sewing the bags 31, 32, the bags 32, 33, and the bags 33, 31 respectively.

As shown in FIG. 7, in this embodiment, the first bag 31 has its left-right intermediate position C ₁ positioned closer to the occupant head than the left-right intermediate position C _{2 of the} sheath member 20. Are arranged as follows.

In this embodiment, a tongue-shaped extending portion 31a is provided so as to protrude from the front end side of the first bag 31 so that the base cloths 34a and 34b extend forward. The extending portion 31 a is located closer to the vehicle compartment door than the intermediate position C _{1 in} the left-right direction of the first bag 31. Further, an extension portion 33 a similar to this is also provided from the tip end side of the third bag 33. The extending portion 33 a is positioned below the intermediate position in the vertical direction of the third bag 33.

  As shown in FIG. 6, the extension part 31a of the first bag 31 and the extension part 33a of the third bag 33 are overlapped, and these side edges are joined together by stitching or the like. A cylindrical sheath member insertion portion 38 (FIG. 7) is formed. The code | symbol 38a has shown the seam which consists of a sewing thread etc. which sewn both edge parts of these extension parts 31a and 33a.

  The sheath member 20 is inserted through the sheath member insertion portion 38.

By thus intermediate position C ₁ of the left-right direction of the first bag 31 is disposed so as to be located on the passenger's head side of the middle position C ₂ in the lateral direction of the sheath 20, the air bag 30, At the time of expansion, as shown in FIG. 8, as a whole, the sheath member 20 expands closer to the occupant head than the sheath member 20.

  As shown in FIG. 9, the airbag 30 has an inflation completed shape that can be inflated to a height that is higher than the center of gravity position G of the occupant's head.

  When the airbag 30 is not inflated, as shown in FIG. 3 (a), the airbag 30 is folded so as to have substantially the same width as the sheath member 20, and is formed on the first outer surface 22 and the second outer surface 23 of the sheath member 20. They are superimposed and encapsulated by an airbag cover 50. The rear end side of the airbag cover 50 is connected to the upper portion of the seat back 3.

  As shown in FIG. 3 (a), the airbag cover 50 has a planned fracture portion 51 on the side opposite to the passenger's head. When the airbag 30 is inflated, the airbag cover 50 is configured to break at the planned breaking portion 51 due to the inflation pressure of the airbag 30 to release the envelope of the airbag 30. The airbag cover 50 is configured, for example, by winding a flat sheet-like base fabric into a cylindrical shape and stitching both ends in the winding direction with low-strength seams (so-called tear seams). This low-strength seam becomes the planned fracture portion 51. However, the configurations of the airbag cover 50 and the planned break portion 51 are not limited to this.

  The airbag cover 50 is made of a flexible material that can be easily shaped along the shoulder of the occupant body. As a material of the airbag cover 50, low-resilience polyurethane foam is suitable. Moreover, it is preferable that the skin of the side which contacts the passenger | crew of this airbag cover 50 is comprised by the mesh fabric.

  By disposing the planned break portion 51 on the side opposite to the passenger's head of the airbag cover 50 in this manner, the planned break portion 51 is less likely to come into contact with the passenger's body when the seat belt 10 is worn. It is good. Further, when the airbag 30 is inflated and the planned breakage portion 51 is broken, the airbag cover 50 is cleaved on the side opposite to the occupant's head, so that the airbag cover 50 after cleavage is as shown in FIG. It extends along the occupant head side of the airbag 30.

  In this embodiment, as shown in FIG. 11, a side airbag 70 that is inflated and deployed forward from the side surface of the seat cushion 3 on the vehicle compartment door side so as to be interposed between the passenger and the vehicle compartment door. The side airbag apparatus provided with this is provided.

  In this embodiment, the side airbag device includes an inflator (not shown) dedicated to the side airbag 70.

  The side airbag 70 is folded and stored in the seat cushion 3 when not inflated.

  The pretensioner, the inflator 40 for the airbag 30 and the inflator for the side airbag 70 are each controlled by a control circuit (not shown). In this embodiment, when a frontal collision of the vehicle is detected or predicted, the pretensioner and the inflator 40 for the airbag 30 are activated and the inflator for the side airbag 70 is deactivated. When a side collision or rollover of the vehicle is detected or predicted, the inflator 40 for the airbag 30 and the inflator for the side airbag 70 are activated and the pretensioner is deactivated. However, the control method of the pretensioner, the inflator 40 for the airbag 30 and the inflator for the side airbag 70 is not limited to this. For example, the pretensioner may be activated when a side collision or rollover of the vehicle is detected or predicted.

  A method of using and operating the occupant restraint device thus configured will be described below.

  After the occupant sits on the seat 1, the seat belt 10 is pulled out and hung around the front of the body, and the tongue is latched in the buckle device.

  The seat belt 10 is passed through the belt insertion portion 21 inside the sheath member 20, and the seat belt 10 does not directly contact the airbag 30. Therefore, it is possible to prevent the airbag 30 from being damaged by rubbing between the seat belt 10 and the airbag 30 when the seat belt 10 is pulled out and wound.

  In this occupant restraint device, the sheath member 20 is provided with an easily deformable portion made of the recess 24, so that the sheath member 20 is in a state where the seat belt 10 is worn or worn. It can be easily deformed following the body shape and movement of the occupant. Thereby, the operability at the time of attaching / detaching the seat belt 10 and the comfort in a state where the seat belt is worn are good. Further, it is possible to prevent the passenger from getting in the way when getting on and off the seat 1.

  In this embodiment, the easily deformable portion is composed of the concave stripes 24 extending in the direction crossing the extending direction of the sheath member 20 on the outer surface of the sheath member 20, and thus the configuration is simple.

  In this embodiment, the first outer surface 22 on the occupant side of the sheath member 20 and the second outer surface 23 on the opposite side are respectively provided with a plurality of recesses spaced in the extending direction of the sheath member 20. Since the strips 24 are provided, the sheath member 20 as a whole is easily deformed along the outer surface of the occupant's body.

  In this embodiment, the sheath member 20 is attached to the seatback 3 so as to be turnable in the left-right direction via the shaft pin 25a. Therefore, the operability when the seat belt is attached and detached and the comfort when the seat belt is worn are high.

  In this embodiment, the sheath member 20 has a flat shape having a first outer surface 22 facing the occupant and a second outer surface 23 opposite to the first outer surface 22. Is small. As a result, the occupant restraint device has a small thickness as a whole, and this occupant restraint device hardly gives the occupant a sense of discomfort when the seat belt 10 is worn.

  When a side collision or rollover of the vehicle is detected or predicted, the control circuit causes the air bag 30 inflator 40 and the side air bag 70 inflator to perform gas ejection operations. The airbag 30 is inflated by the gas from the inflator 40 for the airbag 30 and the side airbag 70 is inflated by the gas from the inflator for the side airbag 70.

  When the airbag 30 starts to inflate, the airbag cover 50 is broken at the planned breaking portion 51 by the inflation pressure of the airbag 30. In this embodiment, the scheduled break portion 51 is disposed on the side surface of the airbag cover 50 opposite to the occupant head, so that the airbag cover 50 is ruptured by the rupture scheduled portion 51. The side opposite to the part is cleaved. Therefore, the broken airbag cover 50 extends along the passenger head side of the airbag 30 as shown in FIG.

  As shown in FIG. 8, the airbag 30 is inflated along the shoulder belt portion 11 on the passenger compartment side of the passenger head. The inflated airbag 30 restrains the movement of the passenger's head toward the passenger compartment door. Further, the inflated airbag 30 hardens the shoulder belt portion 11 and prevents the shoulder belt portion 11 from coming off the occupant shoulder portion.

  In this embodiment, as described above, since the airbag cover 50 extends along the occupant head side of the inflated airbag 30, the occupant head side of the airbag 30 and the airbag cover 50 are not connected. Thus, a frictional force is generated, and the protruding speed of the airbag 30 toward the occupant head is reduced, so that the inflated airbag 30 comes into contact with the occupant head relatively softly. Further, since the airbag cover 50 is interposed between the inflated airbag 30 and the occupant head, due to the cushioning property of the airbag cover 50 itself, when the inflated airbag 30 contacts the occupant head. The shock of is reduced.

In this embodiment, first bag 31 of the air bag 30 is disposed such that the intermediate position C ₁ of the left-right direction is located on the passenger's head side of the lateral direction of the intermediate position C ₂ of the sheath 20 Therefore, as shown in FIG. 8, the airbag 30 is inflated so as to be closer to the passenger's head than the sheath member 20 as a whole. Thereby, a passenger | crew's head can be restrained by the inflated airbag 30 at an early stage.

  In this embodiment, the bag connection port 62a to which the gas introduction port 36 of the first bag 31 of the airbag 30 is connected is the gas introduction port of the second bag 32 and the third bag 33 of the airbag 30. 36 has a smaller diameter than the bag connection ports 62b and 62c to which each is connected, the amount of gas flowing from the inflator 40 into the first bag 31 is the second bag 32 and the third bag. The amount of gas flowing into each of the bags 33 is smaller. Therefore, when the bags 31 to 33 are inflated, the internal pressure of the first bag 31 is lower than the internal pressures of the second bag 32 and the third bag 33. As a result, the inflated first bag 31 does not become excessively hard, and the inflated first bag 31 extends along the upper surface of the occupant shoulder, and from the shoulder belt 11 to the occupant shoulder. The impact applied to is also reduced.

  In this embodiment, as shown in FIG. 11, the side airbag 70 is inflated forward from the side surface of the seat cushion 3 on the vehicle compartment door side so as to be interposed between the passenger and the vehicle compartment door. The inflated side airbag 70 also restrains the movement of the occupant's trunk toward the passenger compartment door.

  When a frontal collision of the vehicle is detected or predicted, the control circuit operates the pretensioner and the inflator 40 for the airbag 30. By the operation of the pretensioner, the seat belt 10 is wound around the seat belt retractor 6 and tension is applied to the seat belt 10. Further, the inflator 40 is operated to eject gas, and the airbag 30 is inflated by the gas from the inflator 40. The action of the inflated airbag 30 is as described above.

  In this embodiment, the sheath member 20 has such rigidity that it is not crushed by the inflation pressure of the airbag 30 even if the airbag 30 is inflated around the sheath member 20. Therefore, even when the airbag 30 is inflated, the seat belt 10 smoothly moves in the belt insertion portion 21 of the sheath member 20 by the winding force of the pretensioner and is wound on the seat belt retractor 6.

  The occupant is firmly restrained by the seat belt 10 that is tensioned by the operation of the pretensioner and the airbag 30 that is inflated on the side of the occupant head.

  In the above-described embodiment, the airbag 30 is arranged so that the middle position in the left-right direction is positioned closer to the occupant head side than the middle position in the left-right direction of the sheath member 20 in the inflated state. In the invention, the arrangement of the airbag 30 is not limited to this. For example, as shown in FIG. 12, the airbag 30 may be disposed so that its middle position in the left-right direction is substantially the same as the middle position in the left-right direction of the sheath member 20 in the inflated state.

  Other configurations of the embodiment of FIG. 12 are the same as those of the embodiment of FIGS.

  In the above-described embodiment, the airbag 30 includes the first bag 31 disposed on the first outer surface 22 side of the sheath member 20 and the second bag 32 disposed on the passenger head side of the sheath member 20. And the third bag 33 disposed on the opposite side of the second bag 32 with the sheath member 20 interposed therebetween, but the configuration of the airbag is not limited to this.

  FIGS. 13 and 14 are cross-sectional views showing other structural examples of the airbag.

  In the airbag 30A of FIG. 13, the first bag 31 arranged on the first outer surface 22 side of the sheath member 20 in the airbag 30 of the above embodiment is omitted, and instead of the second bag 32, The lower part of the third bag 33 is connected by a connecting panel 39.

  Further, in the airbag 30B of FIG. 14, the second bag 32 arranged on the occupant head side of the sheath member 20 in the airbag 30 of the above embodiment is omitted, and instead of the first bag 31. The edge part on the passenger head side and the upper part of the third bag 33 are connected by a connecting panel 39.

  Other configurations of the embodiments of FIGS. 13 and 14 are the same as those of the embodiments of FIGS.

  The airbags 30A and 30B shown in FIGS. 13 and 14 also show an example of the airbag according to the present invention, and the airbag is not limited to the illustrated configuration. For example, in the present invention, the airbag may be composed of only one bag.

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

  For example, in the above-described embodiment, the easily deformable portion is configured by the recess 24 extending in the crossing direction with the extending direction of the sheath member 20 on the outer surface of the sheath member 20. The configuration is not limited to this.

  In said embodiment, although the airbag 30 is arrange | positioned at the passenger compartment side of a passenger | crew head, arrangement | positioning of an airbag is not limited to this. For example, in the present invention, the airbag 30 may be disposed along the chest or waist of the occupant. An airbag may be disposed along the lap belt 12. In addition, airbags may be disposed at a plurality of locations on the seat belt 10.

  In the above embodiment, the seat belt device is configured to be provided integrally with the seat 1. However, in the present invention, the seat belt device is configured separately from the seat 1 and attached to the vehicle body. It may be installed.

  In the above embodiment, the inflator 40 for the airbag 30 and the inflator for the side airbag 70 are provided separately. However, the airbag 30 and the side airbag 70 are inflated by a common inflator. It may be configured. By comprising in this way, since one inflator is sufficient, it is possible to reduce the construction cost of the passenger restraint device. In this case, an opening / closing valve is provided in the gas passage connecting the inflator and the side airbag 70, and the valve is closed when the vehicle collides forward to make the side airbag 70 non-inflated, and is opened during a vehicle side collision or rollover. The side airbag 70 may be controlled to be inflated. However, the method for controlling the inflation and non-inflation of the side airbag 70 is not limited to this.

1 is a perspective view of the vicinity of a seat in a vehicle cabin of a vehicle including an occupant restraint device according to an embodiment. It is sectional drawing which follows the II-II line | wire of FIG. (A) A figure is sectional drawing which follows the III-III line | wire of FIG. 2, (b) A figure is an expanded sectional view in the part similar to the (a) figure of the sheath member 20. FIG. It is a perspective view of a sheath member. (A), (b) figure is sectional drawing which follows the VV line | wire of FIG. 4, (c) figure is an enlarged view of the C section of (a) figure. It is a disassembled perspective view of an airbag. It is a top view of an air bag 1st bag and a sheath member. It is sectional drawing of the part similar to FIG. 3 at the time of airbag expansion | swelling. It is a side view at the time of airbag expansion. (A) A figure is a perspective view of an airbag adapter, (b) A figure is a front view of an airbag adapter. It is a side view at the time of side airbag expansion | swelling. It is sectional drawing which shows the example of a change of arrangement | positioning of an airbag. It is sectional drawing which shows another structural example of an airbag. It is sectional drawing which shows another structural example of an airbag.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle seat 2 Seat cushion 3 Seat back 5 Seat belt pull-out port 10 Seat belt 11 Shoulder belt part 12 Lap bag part 20 Sheath member 21 Belt insertion part 22 1st outer surface 23 2nd outer surface 24 Concave 25 Attachment part 30 Airbag 31 First bag 32 Second bag 33 Third bag 36 Gas inlet 38 Sheath member insertion portion 40 Inflator 50 Airbag cover 51 Expected breakage 60 Airbag adapter 70 Side airbag

Claims (7)

A sheath member having a belt insertion portion through which a vehicle seat belt is movably inserted;
An airbag arranged to surround the sheath member;
In an occupant restraint device comprising an inflator for inflating the airbag,
A ride-membered restraint device having a deformable portion in the sheath member,
The sheath member is provided with an attachment portion for attachment to the upper part of the seat back of the vehicle seat
The airbag is arranged on the side of the head of an occupant seated on a vehicle seat in an inflated state,
The occupant restraint device, wherein the attachment portion includes a rotation permission member that allows rotation of the sheath member. A sheath member having a belt insertion portion through which a vehicle seat belt is movably inserted;
An airbag arranged to surround the sheath member;
An inflator for inflating the airbag; and
In an occupant restraint device comprising:
An occupant restraint device provided with an easily deformable portion on the sheath member,
The sheath member is provided with an attachment portion for attachment to the upper part of the seat back of the vehicle seat,
The airbag is arranged on the side of the head of an occupant seated on a vehicle seat in an inflated state,
The air bag includes a first bag disposed along the occupant, a second bag disposed on the occupant head side, and a second bag disposed on the opposite side of the occupant head from the second bag. An occupant restraint device comprising three bags. The occupant restraint device according to claim 1 or 2 , wherein the sheath member is made of a synthetic resin. The sheath member according to any one of claims 1 to 3 , wherein the sheath member extends in a seat belt insertion direction.
The occupant restraint device, wherein the easily deformable portion is a recess or a notch that extends in at least a part of the outer surface of the sheath member in the direction intersecting with the extending direction. The sheath member according to claim 4 , wherein the sheath member has a flat shape having a first outer surface facing the occupant and a second outer surface opposite to the first outer surface.
The occupant restraint device, wherein the recess or the cut is provided at least on the second outer surface. 6. The occupant restraint device according to claim 5 , wherein a plurality of the recesses or cuts are provided at intervals in the extending direction of the sheath member. The airbag according to any one of claims 1 to 6 , wherein the airbag is in an inflated state such that an intermediate position in the left-right direction of the vehicle seat is located closer to the occupant head side than an intermediate position in the left-right direction of the sheath member An occupant restraint device.

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