Vehicle occupant restraint device

Abstract

To obtain a vehicular occupant restraint device which can effectively apply reaction force to a center air bag during occupant restraining by the center air bag inflated and deployed from a side section at the vehicle width direction inside of a seat back to the vehicle width direction inside of an occupant.SOLUTION: A vehicular occupant restraint device 10 includes: a vehicle seat 12 which is movably provided in a vehicle longitudinal direction in a cabin; a center air bag 36 which is provided in a side section at the vehicle width direction inside of a seat back 16 in the vehicle seat 12 and is inflated and deployed to the vehicle width direction inside of an occupant seated on the vehicle seat 12 by supply of gas jetted from an inflator 32 to the inside; and a string member 42 which has one end 42A mounted at a seat front side end of the center air bag 36 and the other end mounted in a drawing-in device 50 and is pulled to a seat front side by being drawn by the drawing-in device 50 at timing for restraining the occupant by the inflated and deployed center air bag 36.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an occupant restraint device for a vehicle.

Background Art

[0002] An occupant restraint system that deploys the lower end of a side airbag between the occupant's waist and the console box to suppress the occupant's movement inward in the vehicle width direction has been conventionally known (see, for example, Patent Document 1).

[0003] Also, an occupant protection device is conventionally known that connects a seat and the upper part of a center airbag inflated and deployed from the seat back of the seat, includes a tether that pulls the center airbag after inflation and deployment toward the seat side, and controls the tension of the tether according to the front-rear positional relationship between the seat backs of the left and right seats (see, for example, Patent Document 2).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, when the lower end of the inflated and deployed center airbag does not sufficiently overlap the console box in a side view, in other words, in the case of a small-sized occupant, etc., when the vehicle seat takes a front-side position where the front end surface at the side part of the seat back is located on the front side of the front surface of the console box, when restraining the occupant with the inflated and deployed center airbag, it is difficult for the center airbag to obtain a reaction force from the console box.

[0006] Therefore, occupants who move inward in the vehicle width direction due to the inertial force of a side collision may fall inward along with the center airbag. In other words, in a plan view, the inflated and deployed center airbag may rotate inward in the vehicle width direction with its rear end as the pivot point, making it difficult to restrain the occupant with the inflated and deployed center airbag.

[0007] Furthermore, simply tethering the upper part of the center airbag, which inflates and deploys from the seat back, towards the seat may not effectively provide the necessary reaction force at the lower part of the center airbag when the occupant is restrained by the inflated and deployed airbag. Thus, there is still room for improvement in the structure that effectively provides reaction force to the center airbag when the occupant is restrained by the inflated and deployed airbag.

[0008] Therefore, the present invention aims to provide a vehicle occupant restraint device that can effectively apply a reaction force to a center airbag when the occupant is restrained by the center airbag, which is expanded and deployed from the side of the seat back on the vehicle width side toward the occupant in the vehicle width direction. [Means for solving the problem]

[0009] To achieve the above objective, a first embodiment of the present invention provides a vehicle occupant restraint device comprising: a vehicle seat provided in a vehicle compartment so as to be movable in the longitudinal direction of the vehicle, with an upper rail supported by a lower rail; a center airbag provided on the inner side in the vehicle width direction of the seat back of the vehicle seat, which inflates and deploys toward the inward direction of the vehicle width direction of an occupant seated on the vehicle seat when gas ejected from an inflator is supplied inside; and a string-like member, one end of which is attached to the front end of the seat of the center airbag and the other end of which is attached to a retraction device, which is pulled toward the front of the seat by being retracted by the retraction device at the time when the occupant is restrained by the inflated and deployed center airbag.

[0010] According to the first embodiment of the invention, when a vehicle is involved in a side collision, the inflator activates, and the gas ejected from the inflator is supplied to the center airbag. As a result, the center airbag inflates and deploys inward in the vehicle width direction towards the occupant seated in the vehicle seat. Note that "when a vehicle is involved in a side collision" includes not only when a side collision of the vehicle is detected, but also when a side collision of the vehicle is predicted.

[0011] In this case, for example, if the occupant seated in the vehicle seat is small in stature, the vehicle seat may be positioned in a forward position where, in a side view, the front end surface of the side of the seat back is located further forward than the front of the console box. In this case, the inflated and deployed center airbag will have difficulty obtaining a reaction force from the console box.

[0012] However, one end of a string-like member is attached to the front end of the center airbag, and the other end of the string-like member is attached to a retraction device. The retraction device then retracts the string-like member at the moment the inflated and deployed center airbag restrains the occupant, pulling the string-like member forward of the seat. In other words, the inflated and deployed center airbag is pulled forward of the seat by the string-like member at the appropriate time to restrain the occupant.

[0013] Therefore, even if the lower end of the center airbag does not sufficiently overlap with the console box in a side view, when the center airbag inflates and deploys, rotational behavior (tilting) inward in the vehicle width direction with the rear end of the center airbag as the pivot point is suppressed, and a reaction force (holding force) is effectively applied to the center airbag. Thus, the occupant is effectively restrained by the center airbag.

[0014] Furthermore, a second embodiment of the vehicle occupant restraint device according to the present invention is a vehicle occupant restraint device according to the first embodiment, comprising: a tether provided above the seat above the center portion in the vertical direction of the seat inside the center airbag and maintaining the shape of the inflated and deployed center airbag; and a tension-transmitting base fabric provided at the center portion in the vertical direction of the seat at the front end of the seat of the center airbag and to which one end of the string-like member is attached, wherein in a side view, the upper end of the tension-transmitting base fabric is positioned at the same height as the tether of the inflated and deployed center airbag, and the lower end of the tension-transmitting base fabric is positioned at the same height as the mounting position of the center airbag on the seat back.

[0015] According to the second embodiment of the invention, in a side view, the upper end of the tension-transmitting base fabric is positioned at the same height as the tether of the inflated and deployed center airbag, and the lower end of the tension-transmitting base fabric is positioned at the same height as the mounting position of the center airbag on the seat back. Here, the area where the tether is provided and the mounting position of the center airbag are areas with high rigidity. Therefore, when the tension-transmitting base fabric is provided between these two areas, the inflated and deployed center airbag is pulled forward towards the seat in a balanced vertical direction. In other words, the center airbag effectively applies a reaction force (in a balanced vertical direction). Note that "same height position" as used here includes "approximately the same height position" which is slightly shifted vertically from the same height position.

[0016] Furthermore, a third embodiment of the vehicle occupant restraint device according to the present invention is a vehicle occupant restraint device according to the first or second embodiment, wherein the retraction device is provided on the front side portion of the seat cushion of the vehicle seat, and the middle portion of the string-like member is housed in a case provided on the outside in the seat width direction of the upper rail of the vehicle seat, and is configured to pop out of the case when retracted by the retraction device.

[0017] According to the third embodiment of the invention, the retraction device is provided on the front portion of the seat cushion of the vehicle seat. As a result, the cord-like member is efficiently pulled toward the front of the seat. Consequently, the inflated and deployed center airbag effectively applies a reaction force, improving the restraint force on the occupant. Furthermore, when the retraction device is provided on the front portion of the seat cushion of the vehicle seat, compared to, for example, when the retraction device is provided on the rear portion of the seat cushion, it is not necessary to route the cord-like member that is pulled toward the front of the seat from the front portion of the seat cushion to the rear portion of the seat cushion using pulleys or the like on the front portion of the seat cushion. Therefore, the length of the cord-like member is reduced, and since pulleys or the like are not required, the structure of the seat cushion is simplified.

[0018] Furthermore, the middle portion of the string-like member is housed in a case located on the outer side of the upper rail of the vehicle seat in the seat width direction, and is configured to protrude from the case when retracted by the retraction device. In other words, under normal conditions, the middle portion of the string-like member is hidden by the case. Therefore, under normal conditions, the appearance of the vehicle seat is not spoiled by the middle portion of the string-like member.

[0019] Furthermore, a fourth embodiment of the vehicle occupant restraint device according to the present invention is a vehicle occupant restraint device according to the third embodiment, wherein the retraction device comprises a spool around which the other end of the string-like member is wound, and a rack and pinion mechanism driven by a gas generator to rotate the spool.

[0020] According to the fourth embodiment of the invention, the retraction device comprises a spool around which the other end of a string-like member is wound, and a rack and pinion mechanism driven by a gas generator to rotate the spool. Therefore, the inflated and deployed center airbag is effectively pulled forward by its string-like member at the appropriate time to restrain the occupant. In other words, the center airbag effectively provides a reaction force.

[0021] Further, the vehicle occupant restraint device according to the fifth aspect of the present invention is the vehicle occupant restraint device according to the third aspect, wherein the string-like member is an inflatable tension strap that generates tension by the inflation of the chamber, and the retraction device includes an inflater that supplies gas to the chamber.

[0022] According to the invention of the fifth aspect, the string-like member is an inflatable tension strap that generates tension by the inflation of the chamber. And the retraction device includes an inflater that supplies gas to the chamber. Therefore, the inflated and deployed center airbag is effectively pulled toward the front side of the seat at an appropriate timing to restrain the occupant by the inflatable tension strap. That is, an effective reaction force is applied by the center airbag. Further, since the occupant's thigh is restrained by the inflatable tension strap, the restraint performance for the occupant is improved.

Effect of the Invention

[0023] As described above, according to the present invention, when restraining an occupant by a center airbag inflated and deployed from the inner side portion in the vehicle width direction of the seat back toward the inner side of the occupant in the vehicle width direction, an effective reaction force can be applied to the center airbag.

Brief Description of the Drawings

[0024] [Figure 1] It is a schematic side view showing a vehicle seat when the center airbag of the vehicle occupant restraint device according to the first embodiment is inflated and deployed. [Figure 2] It is a schematic side view showing the wiring state of the strap of the vehicle occupant restraint device according to the first embodiment. > [Figure 3] It is a schematic bottom view showing a seat cushion in a vehicle seat of the vehicle occupant restraint device according to the first embodiment. [Figure 4](A) A schematic enlarged side view showing the state of the retraction device of the vehicle occupant restraint device according to the first embodiment before operation. (B) A schematic enlarged side view showing the state of the retraction device of the vehicle occupant restraint device according to the first embodiment after operation. [Figure 5] (A) A schematic rear view showing the straps routed inside the case of the vehicle occupant restraint device according to the first embodiment. (B) A schematic rear view showing the straps when they are released from inside the case of the vehicle occupant restraint device according to the first embodiment. [Figure 6] (A) A schematic side view showing the state of the retraction device of the vehicle occupant restraint device according to the second embodiment before operation. (B) A schematic side view showing the state of the retraction device of the vehicle occupant restraint device according to the second embodiment after operation. [Modes for carrying out the invention]

[0025] The embodiments of the present invention will be described in detail below with reference to the drawings. For the sake of explanation, in each figure, the arrow UP will indicate the upward direction of the vehicle and the vehicle seat, the arrow FR will indicate the forward direction of the vehicle and the vehicle seat, and the arrow RH will indicate the rightward direction of the vehicle and the vehicle seat. Therefore, in the following description, when the directions of up and down, front and back, and left and right are mentioned without further specification, they refer to the up and down, front and back, and left and right directions of the vehicle and the vehicle seat. Also, the left and right directions are synonymous with the vehicle width direction and the seat width direction.

[0026] Although not shown in the illustrations, the "occupant" in this embodiment is, for example, an occupant corresponding to AF05 (the 5th percentile of adult American women) of the WorldSID (World Side Impact Dummy). In other words, the "occupant" in this embodiment is, for example, a small occupant.

[0027] <First Embodiment> First, the first embodiment will be described. As shown in Figure 1, the vehicle seat 12 constituting the vehicle occupant restraint device 10 according to the first embodiment is, for example, a front seat on the right side of the passenger compartment of a vehicle, and has a seat cushion 14 on which the occupant sits (supporting the occupant's buttocks and thighs), a seat back 16 that supports the occupant's back, and a headrest 18 that supports the occupant's head.

[0028] In a side view from the vehicle width direction (seat width direction), the seat cushion 14 extends in the front-rear direction, and the seat back 16 extends vertically, rotatably connected to the rear end of the seat cushion 14 with the seat width direction as the axial direction. The headrest 18 is provided so as to be able to move up and down at the center of the seat width direction at the upper end of the seat back 16.

[0029] The occupant is restrained in the vehicle seat 12 by a seat belt device (not shown). The buckle device to which the tongue of the seat belt is detachably attached is mounted on a seat side garnish (not shown) that covers the outer side in the seat width direction on the lower side of the seat cushion 14.

[0030] As shown in Figure 2, the floor 20 of the passenger compartment is provided with a pair of left and right lower rails 22 that extend in the longitudinal direction. Each lower rail 22 supports a pair of left and right upper rails 24, which are provided on the lower sides of the seat cushion 14 in the seat width direction, so that they can slide in the longitudinal direction. The upper rails 24 (seat cushion 14) are configured to be movable in the longitudinal direction along the lower rails 22 by a known electric mechanism.

[0031] Although not shown in the illustration, a console box is provided on the floor 20 of the passenger compartment, inward in the vehicle width direction from the vehicle seats 12 (center in the vehicle width direction). The console box is a rectangular hollow box with the front-to-rear direction as its longitudinal direction in a plan view, and its open top is configured to be openable and closable by a lid of a predetermined thickness. The height of the console box lid to the top surface is such that the occupant can rest their elbows without having to assume an awkward posture.

[0032] Furthermore, as shown in Figure 1, a center airbag device 30 is provided on the left side portion 16S, which is the inner side portion of the seat back 16 in the vehicle width direction. The center airbag device 30 consists of an inflator 32 embedded in the left side portion 16S of the seat back 16, an inner cloth (inner tube) 34 that distributes the gas ejected from the inflator 32 upward and downward, and a center airbag 36 (far side airbag) with the inner cloth 34 inside.

[0033] The inflator 32 is a cylindrical gas generator formed in a substantially cylindrical shape, and its axial direction is aligned with the side frames 17 (see Figure 2) that constitute the left and right sides of the seat back 16 (approximately vertical direction). The inflator 32 is attached to the side frames 17 together with the folded center airbag 36.

[0034] Figure 2 shows a modularized center airbag system 30 consisting of the folded center airbag 36 (including the inner fabric 34) and the inflator 32. The inflator 32 activates when a side collision of the vehicle is detected or predicted (hereinafter referred to as "side collision"), and is capable of instantly supplying gas to the inside of the center airbag 36 via the inner fabric 34.

[0035] As shown in Figure 1, a cylindrical portion 35 extending downward is integrally formed on the rear side of the inner fabric 34, and the upper end portion 32A having the nozzle of the inflator 32 is inserted into the cylindrical portion 35 from below and connected to the cylindrical portion 35. The height position of the lower peripheral edge 35A of the cylindrical portion 35 of the inner fabric 34 is the mounting position of the center airbag 36 on the seat back 16 (side frame 17).

[0036] The front side of the inner fabric 34 is formed in a cylindrical shape with its axial direction approximately vertical, and has an upper opening 34A and a lower opening 34B. Therefore, the inner fabric 34 is able to blow the gas ejected from the inflator 32 upwards and downwards within the center airbag 36. This configuration allows the center airbag 36 to inflate and deploy quickly.

[0037] In other words, the center airbag 36, which is folded and embedded in the left side portion 16S of the seatback 16, is quickly positioned in a side view from approximately the center of the headrest 18 in the vertical direction to near the lower end of the seatback 16 (to a predetermined position below the upper surface of the console box lid in a front view) by gas being supplied to the interior from the inflator 32.

[0038] More specifically, the inflated and deployed center airbag 36 is positioned on the inside of the vehicle width direction of at least the waist, abdomen, chest, shoulders, and head of the occupant seated in the vehicle seat 12. In particular, the upper part of the center airbag 36 is formed in a roughly elliptical shape that bulges forward and upward from the lower part that restrains the occupant's chest and below, so as to be able to restrain the occupant's head.

[0039] In other words, when the center airbag 36 is fully inflated and deployed, a constricted portion 36A is formed in the approximate center of the front end (hereinafter referred to as the "front end portion 36F") in the vertical direction when viewed from the side, and it is roughly shaped like a ">" and recessed towards the rear. The center airbag 36 is formed into a single bag shape by sewing the outer edges of two base fabrics together.

[0040] Furthermore, a tether 38 is provided above the vertical center of the center airbag 36 (at approximately the same height as the upper end of the tension transmission base fabric 40, which will be described later) to maintain the shape of the inflated and deployed center airbag 36. The tether 38 is formed in a planar shape from the same fabric as the base fabric of the center airbag 36, for example, and connects the base fabric on the inside in the seat width direction to the base fabric on the outside in the seat width direction of the center airbag 36.

[0041] In other words, the inner end of the tether 38 in the seat width direction is sewn to the base fabric on the inner side of the center airbag 36 in the seat width direction, and the outer end of the tether 38 in the seat width direction is sewn to the base fabric on the outer side of the center airbag 36 in the seat width direction. The tether 38 has multiple through holes (not shown) formed at appropriate positions for allowing gas to pass through. The tether 38 may also be composed of multiple strip-shaped straps (not shown) that are spaced apart in the front-rear direction.

[0042] Furthermore, a tension-transmitting base fabric 40 is provided in the vertically central portion of the front end portion 36F of the center airbag 36, i.e., the constricted portion 36A. The tension-transmitting base fabric 40 is made of the same fabric as the base fabric of the center airbag 36, and is formed in a roughly diamond shape when viewed from the side. The upper edge portion 40A and the lower edge portion 40B on the rear side are positioned along the constricted portion 36A of the center airbag 36 and sewn to the constricted portion 36A (front end portion 36F).

[0043] As shown in Figure 1, in a side view, the upper end (upper corner 40U) of the tension transmission base fabric 40 is positioned at approximately the same height as the tether 38 of the inflated and deployed center airbag 36 (either at the same height or slightly above). The lower end (lower corner 40D) of the tension transmission base fabric 40 is positioned at approximately the same height as the lower peripheral edge 35A of the cylindrical portion 35 of the inner fabric 34, which is the mounting position for the center airbag 36 on the seat back 16 (side frame 17) (either at the same height or slightly below).

[0044] Furthermore, one end 42A of a strap 42, which is a string-like member, is attached to the front corner 40F of the tension transmission base fabric 40. In other words, one end 42A of the strap 42 is attached to the front end 36F (constricted portion 36A) of the center airbag 36 via the tension transmission base fabric 40. The other end of the strap 42 is attached to the retraction device 50.

[0045] As shown in Figures 1 to 3, the retraction device 50 is provided on the front (front) portion of the underside of the seat cushion 14 of the vehicle seat 12. The retraction device 50 consists of a spool 44 to which the other end of the strap 42 is attached and wound, a rack and pinion mechanism 46 (see Figure 4) for rotating the spool 44, and a gas generator 48 for driving the rack and pinion mechanism 46.

[0046] The spool 44 is configured to rotate axially in the seat width direction, and the rotation axis 44A of the spool 44 extends inward in the seat width direction. As shown in Figure 4(A), a pinion gear 46A is coaxially fixed to the extended inward end of the rotation axis 44A of the spool 44 in the seat width direction. A rack gear 46B meshes with the pinion gear 46A from above, and the rack gear 46B is held so as to be able to protrude from the gas generator 48.

[0047] Therefore, the retraction device 50 operates as follows: The gas generator 48 operates at the moment the occupant is restrained by the inflated and deployed center airbag 36. As shown in Figure 4(B), the rack gear 46B instantly protrudes forward, causing the pinion gear 46A, which is meshed with the rack gear 46B, to rotate (counterclockwise in the figure). This causes the spool 44 to rotate, and the other end of the strap 42 is instantly wound onto the spool 44.

[0048] In other words, the other end of the strap 42 is instantly retracted by the retraction device 50, and the strap 42 is pulled forward (more specifically, forward and downward). When the strap 42 is pulled forward, the tension transmission base fabric 40 is pulled forward, and therefore the center airbag 36 is pulled forward (see Figure 1).

[0049] The "timing at which the occupant is restrained by the inflated and deployed center airbag 36" refers, for example, to the timing immediately before the center airbag 36 completes its inflation and deployment (within tens of milliseconds). Furthermore, the spool 44 (including the rotating shaft 44A), the rack and pinion mechanism 46, and the gas generator 48 are each covered by a cover body 28.

[0050] Furthermore, as shown in Figure 2, in the state before being retracted by the retraction device 50 (normal state), one end of the strap 42 is routed downward along the side frame 17 from the corner 40F (see Figure 1) of the tension transmission base fabric 40, which is folded together with the center airbag 36, and is pulled out to the outside from the lower end of the left side 16S of the seat back 16. It is then routed behind the buckle device, over the seat side garnish, and to the lower side of the seat cushion 14.

[0051] The strap 42, routed below the seat cushion 14, is routed forward below the seat cushion 14 and wound around the spool 44. The middle portion of the strap 42 routed forward below the seat cushion 14 extends in the front-rear direction and is housed inside a resin case 26 that is open at the front and rear (no front or rear walls are provided).

[0052] As shown in Figure 5(A), this case 26 is attached to the outer wall surface 24A of the upper rail 24 facing outward in the sheet width direction by adhesive or the like, and is formed in a cylindrical shape that is roughly rectangular in cross-sectional view when viewed from the front or rear direction. The upper end of the outer wall 26A of the case 26, which is located on the outside in the sheet width direction, is a flange portion 26B that extends outward in the sheet width direction, and the outer end of the upper wall 26U of the case 26, which is on the outside in the sheet width direction, is a flange portion 26C that is joined to the flange portion 26B from above with an adhesive or the like that can be easily peeled off.

[0053] As a result, as shown in Figure 5(B), when the strap 42 is retracted by the retraction device 50, the middle portion of the strap 42 detaches from the joint between the flange portion 26B and the flange portion 26C and pops out of the case 26. The middle portion of the strap 42 that pops out of the case 26 then moves upward through the outside of the buckle device in the sheet width direction and is stretched between the spool 44 and the tension-transmitting base fabric 40 (corner portion 40F) with a predetermined tension (pulling the tension-transmitting base fabric 40) (see Figure 1).

[0054] The operation of the vehicle occupant restraint device 10 according to the first embodiment, which has the configuration described above, will now be explained.

[0055] During a side collision with the vehicle, the inflator 32 activates, and the gas ejected from the inflator 32 is instantly supplied to the interior of the inner fabric 34, and then supplied to the interior of the center airbag 36 through the upper opening 34A and lower opening 34B of the inner fabric 34. As a result of the supply of gas, the internal pressure (inflation pressure) of the center airbag 36, which has begun to inflate, causes the outer covering of the left side portion 16S of the seatback 16 to rupture from the lower end to the upper end.

[0056] In other words, the center airbag 36 inflates and deploys toward the left side (inward in the vehicle width direction) of at least the waist, abdomen, chest, shoulders, and head of the occupant seated in the vehicle seat 12. As a result, at least the left side of the occupant from the waist to the head is covered from the left side by the center airbag 36. Therefore, in the event of a side collision with the vehicle, the left side of the occupant from the waist to the head, which is moving inward in the vehicle width direction due to inertial force, can be restrained by the center airbag 36.

[0057] Here, for example, if the occupant seated in the vehicle seat 12 is a small person, the vehicle seat 12 may adopt a forward position in which, in a side view, the front end surface of the lower left side 16S of the seat back 16 is positioned further forward than the front of the console box. In this case, the inflated and deployed center airbag 36 will have difficulty obtaining a reaction force from the console box.

[0058] However, one end 42A of a strap 42 is attached to the front end 36F of the center airbag 36 via a tension transmission base fabric 40, and the other end of the strap 42 is attached to a retraction device 50. The retraction device 50 then retracts the strap 42 and pulls it forward at the moment the inflated and deployed center airbag 36 restrains the occupant. In other words, the inflated and deployed center airbag 36 is pulled forward by the strap 42 (see Figure 1).

[0059] Therefore, even if, in a side view, the lower end of the center airbag 36 that inflates and deploys from the left side portion 16S of the seat back 16 toward the occupant in the vehicle width direction does not sufficiently overlap with the console box (even if it is shifted forward), the rotational behavior (tilting) toward the vehicle width direction (outward in the seat width direction) with the rear end of the center airbag 36 as the pivot point can be effectively suppressed or prevented when the occupant is restrained by the center airbag 36.

[0060] In other words, even when the vehicle seat 12 is in a forward position, the inflated and deployed center airbag 36 can be effectively given a reaction force (holding force), and the occupant is effectively restrained by the center airbag 36. Thus, according to the center airbag 36 of the first embodiment, the occupant can be effectively restrained (restraint performance for the occupant can be ensured) regardless of the position of the vehicle seat 12.

[0061] Furthermore, the tension-transmitting base fabric 40 is formed in a roughly diamond shape when viewed from the side, and its rear upper edge 40A and lower edge 40B are sewn and attached along the constricted portion 36A of the center airbag 36. Therefore, compared to the case where the tension-transmitting base fabric 40 is not provided and one end 42A of the strap 42 is directly attached to the constricted portion 36A, when the inflated and deployed center airbag 36 is pulled forward, it is possible to pull the center airbag 36 while stabilizing its shape.

[0062] In particular, it is more effective if, in a side view, the upper end of the tension-transmitting base fabric 40 is positioned at approximately the same height as the tether 38 of the inflated and deployed center airbag 36, and the lower end of the tension-transmitting base fabric 40 is positioned at approximately the same height as the mounting position of the center airbag 36 on the seat back 16 (the lower peripheral edge 35A of the cylindrical portion 35 of the inner fabric 34).

[0063] In other words, the area where the tether 38 is provided and the mounting position of the center airbag 36 are areas with high rigidity. Therefore, if the tension transmission base fabric 40 is provided between these two areas, the strap 42, which is pulled in by the retraction device 50, can pull the inflated and deployed center airbag 36 forward in a balanced manner (with its shape more stable) via the tension transmission base fabric 40. In other words, the tension line applied to the center airbag 36 can be efficiently secured, and the reaction force can be applied more effectively (in a balanced manner) to the center airbag 36.

[0064] Furthermore, the retraction device 50 for pulling in the strap 42 is located at the front of the underside of the seat cushion 14 of the vehicle seat 12. Therefore, the retraction device 50 can efficiently pull the strap 42 forward. Consequently, the inflated and deployed center airbag 36 can effectively provide a reaction force, thereby improving the restraint force on the occupant.

[0065] Furthermore, if the retraction device 50 is provided at the front of the underside of the seat cushion 14 of the vehicle seat 12, for example, compared to the case where it is provided at the rear of the underside of the seat cushion 14, it is not necessary to route the strap 42 that is pulled forward from the front to the rear of the seat cushion 14, and to provide a pulley or the like on the front side. As a result, the length of the strap 42 can be reduced, and since there is no need to provide a pulley or the like, the configuration of the underside of the seat cushion 14 can be simplified.

[0066] Furthermore, the retraction device 50 includes a spool 44 around which the other end of the strap 42 is wound, a rack and pinion mechanism 46 for rotating the spool 44, and a gas generator 48 for driving the rack and pinion mechanism 46. Therefore, the strap 42 can be effectively retracted at an appropriate timing different from the inflation and deployment timing of the center airbag 36.

[0067] In other words, the strap 42 can be pulled forward at the timing when the inflated and deployed center airbag 36 can effectively restrain the occupant, who is moving inward in the vehicle width direction due to inertial force. This allows the inflated and deployed center airbag 36 to effectively provide a reaction force, and the center airbag 36 can effectively restrain the occupant.

[0068] Furthermore, the middle portion of the strap 42 is housed in a case 26 provided on the outer wall surface 24A of the upper rail 24 of the vehicle seat 12, and is configured to protrude from the case 26 when it is retracted by the retraction device 50. In other words, under normal conditions, the middle portion of the strap 42 is hidden by the case 26. Therefore, under normal conditions, it is possible to prevent the appearance of the vehicle seat 12 from being spoiled by the middle portion of the strap 42.

[0069] <Second Embodiment> Next, a second embodiment will be described. Note that parts equivalent to those in the first embodiment are denoted by the same reference numerals, and detailed descriptions (including common functions) will be omitted as appropriate.

[0070] As shown in Figure 6, in this second embodiment, only the configuration of the string-like member and the retraction device 50 differs from that of the first embodiment. Specifically, the string-like member in this second embodiment is an inflatable tension strap 52 that generates tension by the expansion of the chamber 54, and the retraction device 50 is configured to include an inflator 56 (shown by dashed lines in Figure 3) that supplies gas to the chamber 54.

[0071] The inflator 56 is provided, for example, at the front of the underside of the seat cushion 14 of a vehicle seat 12, with the seat width direction as its axial direction (see Figure 3), and one end of the inflator 56 in the seat width direction, which has an outlet, is connected in communication with a chamber 54 enclosed within the inflatable tension strap 52.

[0072] The chamber 54 enclosed within the inflatable tension strap 52 is configured to expand in a direction perpendicular to the extending direction of the inflatable tension strap 52, and this expansion is configured to impart a predetermined tension to the extending direction of the inflatable tension strap 52.

[0073] Therefore, when the inflator 56 is activated and supplies gas to the chamber 54, the inflatable tension strap 52 is pulled forward (more specifically forward and downward). This causes the inflated and deployed center airbag 36 to be effectively pulled forward via the tension-transmitting base fabric 40 at the appropriate time to restrain the occupant.

[0074] Furthermore, since the inflatable tension strap 52 expands in a direction perpendicular to its extending direction, the expanded inflatable tension strap 52 can also restrain, for example, the occupant's thighs. In other words, this inflatable tension strap 52 can improve the restraint performance for the occupant.

[0075] The vehicle occupant restraint device 10 according to this embodiment has been described above based on the drawings. However, the vehicle occupant restraint device 10 according to this embodiment is not limited to the illustrated version, and can be modified as appropriate without departing from the spirit of the present invention.

[0076] For example, an upward extension (not shown) that reaches the lower end of the left side portion 16S of the seat back 16 may be integrally provided at the rear end of the case 26 to house the strap 42, so that the strap 42 pulled out from the lower end of the left side portion 16S of the seat back 16 is not visible at all, at least in a side view.

[0077] Furthermore, although this embodiment was described using a small occupant as an example, the same effects can be obtained even for occupants of average or large build, simply by adding the effect of making it easier to obtain a reaction force from the console box. Also, the retraction device 50 is not limited to the configurations shown in the figures, and it is sufficient if the other end of the strap 42 is pulled forward at an appropriate timing. [Explanation of symbols]

[0078] 10. Vehicle occupant restraint devices 12 Vehicle seats 14 Seat Cushions 16 Seatback 22 Lower Rail 24 Upper Rail 26 cases 32 Inflator 36 Center airbag 38 Tether 40 Tension transmission base fabric 42. Strap (string-like component) 42A One end 44 spools 46 Rack and pinion mechanism 48 Gas Generator 50. Inlet device 52 Inflatable tension strap (string-like component) 54 Chambers 56 Inflator

Claims

1. The upper rail is supported by the lower rail, and a vehicle seat is installed in the vehicle compartment so as to be movable in the longitudinal direction of the vehicle. A center airbag is provided on the inner side of the seat back of the vehicle seat in the vehicle width direction, and when gas ejected from an inflator is supplied to the interior, it inflates and deploys toward the inward side in the vehicle width direction of the occupant seated in the vehicle seat, A string-like member is attached to the front end of the seat of the center airbag at one end and to a retraction device at the other end, and is pulled forward of the seat by the retraction device when the inflated and deployed center airbag restrains the occupant. A tether is provided inside the center airbag, above the center of the seat in the vertical direction, to maintain the shape of the inflated and deployed center airbag, A tension-transmitting base fabric is provided at the center of the seat in the vertical direction at the front end of the seat of the center airbag, to which one end of the string-like member is attached, Equipped with, A vehicle occupant restraint device in which, in a side view, the upper end of the tension-transmitting base fabric is positioned at the same height as the tether of the inflated and deployed center airbag, and the lower end of the tension-transmitting base fabric is positioned at the same height as the mounting position of the center airbag on the seat back.

2. A vehicle seat is provided in the vehicle compartment so as to be movable in the longitudinal direction of the vehicle, with the upper rail being supported by the lower rail, A center airbag is provided on the inner side of the seat back of the vehicle seat in the vehicle width direction, and when gas ejected from an inflator is supplied to the interior, it inflates and deploys toward the inward side in the vehicle width direction of the occupant seated in the vehicle seat, A string-like member is attached to the front end of the seat of the center airbag at one end and to a retraction device at the other end, and is pulled forward of the seat by the retraction device when the inflated and deployed center airbag restrains the occupant. Equipped with, The retraction device is provided on the front portion of the seat cushion of the vehicle seat, The aforementioned string-like member is housed in a case located on the outside of the seat width direction of the upper rail of the vehicle seat, and is configured to pop out of the case when pulled in by the retraction device, in a vehicle occupant restraint device.

3. The retraction device is provided on the front portion of the seat cushion of the vehicle seat, The vehicle occupant restraint device according to claim 1, wherein the middle portion of the string-like member is housed in a case provided on the outside of the seat width direction of the upper rail of the vehicle seat, and when it is pulled in by the retraction device, it pops out of the case.

4. The aforementioned retraction device is The other end of the string-like member is wound around a spool, A rack and pinion mechanism driven by a gas generator rotates the spool, A vehicle occupant restraint device according to claim 2 or claim 3, comprising the above.

5. The aforementioned string-like member is an inflatable tension strap that generates tension due to the expansion of the chamber. The vehicle occupant restraint device according to claim 2 or 3, wherein the retraction device comprises an inflator that supplies gas to the chamber.

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