Seat cushion airbag and seat cushion airbag device

Abstract

The invention provides a seat cushion air bag and a seat cushion air bag device including the seat cushion air bag. The seat cushion air bag can reduce the time delay of impact and upper deformation of the seat cushion air bag, and can stably restrain the upper body of a passenger by a shoulder strap. A seat cushion airbag (11) is connected to an inflation fluid generation source (10), supplies inflation fluid to the inside thereof, deploys and inflates, is disposed in a seat portion (91) of a vehicle seat (90) in a region below a seat surface (93) and between a center portion and a front end portion in a front-rear direction of the seat portion (91), and has a side portion (11s) between a top portion (11t) and a bottom portion (11b) when deployed and inflated, and a side portion (11s) between the top portion (11t) and the bottom portion (11b) when deployed and inflated. Vertical walls (20) extending in the vertical direction are provided in at least two opposing regions of the side section (11s).

Description

Technical Field

[0001] The present invention relates to a seat cushion airbag and a seat cushion airbag device having the same. Background Art

[0002] When an impact occurs, such as during a vehicle collision, there is a phenomenon in which an occupant slides forward and downward from the seat surface of the seat (so-called diving phenomenon).

[0003] In this specification, the front side, the front, etc. refer to the front side, the front, etc. in the front-rear direction based on the body of an occupant sitting on the seat portion of the seat. Similarly, regarding the rear side, the rear, etc., they also refer to the rear side, the rear, etc. in the front-rear direction based on the body of an occupant sitting on the seat portion of the seat. In addition, in this specification, the width direction described later refers to a horizontal direction orthogonal to the front-rear direction.

[0004] It is considered that the cause of the above diving phenomenon is that when an impact from the front is applied to the vehicle, the waist of the occupant moves forward, causing the waist strap (also referred to as a seat belt, safety belt) for restraining the waist of the occupant in the seat belt to pass under.

[0005] In order to suppress the occurrence of the above diving phenomenon, a technique has been proposed in which an airbag called a seat cushion airbag is provided below the seat surface of the seat, more specifically, inside the seat portion (for example, refer to Patent Document 1).

[0006] According to the technique described in Patent Document 1, when an impact occurs, the seat cushion airbag is deployed and inflated to raise the seat surface of the seat. It is considered that the seat cushion airbag is deployed and inflated below the area from the ischium to the thigh of the occupant, so the amount of movement of the waist of the occupant facing forward is reduced. In addition, the seat surface is raised, causing the waist of the occupant to also rise. Therefore, it is difficult for the waist of the occupant to cause the waist strap to pass under, and the occupant is restrained by the seat belt with high reliability on the seat. Thus, it is considered that the above diving phenomenon is difficult to occur.

[0007] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2018-188123

[0008] As described above, the seat cushion airbag described in Patent Document 1 is deployed and inflated when an impact occurs. During this deployment and inflation, the seat cushion airbag raises the waist from below the waist of the occupant, and as a result, it is considered that the upper body of the occupant also rises.

[0009] Here, the occupant sits above the seat cushion airbag and the seat part, and the downward load caused by the occupant acts on the seat part. Therefore, immediately after the seat cushion airbag expands, the occupant becomes an obstacle, and it is difficult for the seat part to deform upward. That is, immediately after the seat cushion airbag expands, the seat part first deforms downward where it is easily deformable, and then deforms upward.

[0010] Therefore, the timing at which this seat cushion airbag raises the occupant's waist shows a tendency to be slightly delayed relative to the time point when the impact occurs.

[0011] In order to more stably restrain the upper body of the occupant with the shoulder belt, it is preferable that the seat cushion airbag makes the timing at which the occupant's waist is raised as close as possible to the time point when the impact occurs.

[0012] The inventors of the present invention conducted intensive research and found that due to the relatively high internal pressure of the seat cushion airbag during expansion, the phenomenon occurs that the timing at which the seat cushion airbag raises the occupant's waist is delayed relative to the time point when the impact occurs. Hereinafter, this phenomenon will be referred to as "the time lag between the occurrence of the impact and the upward deformation of the seat cushion airbag" as needed. In addition, in the case of expansion without special explanation in this specification, it refers to the expansion of the seat cushion airbag.

[0013] In view of the above insights, it can be considered that if the internal pressure of the seat cushion airbag during expansion is reduced, the time lag between the occurrence of the impact and the upward deformation of the seat cushion airbag can be reduced.

[0014] This is because it can be considered that by reducing the internal pressure of the seat cushion airbag during deployment / expansion, the deformation of the seat part downward immediately after the seat cushion airbag is deployed / expanded can be suppressed.

[0015] However, there is also a situation where if the internal pressure of the seat cushion airbag during expansion is low, the force supporting the occupant's body from below is insufficient. In this case, it may also be difficult to stably restrain the upper body of the occupant with the shoulder belt.

[0016] The inventors of the present invention repeatedly conducted intensive research and carefully designed the shape of the seat cushion airbag, thereby expecting to endow the seat cushion airbag with the performance of being able to reduce the time lag between the occurrence of the impact and the upward deformation of the seat cushion airbag and stably restraining the upper body of the occupant with the shoulder belt. SUMMARY OF THE INVENTION

[0017] The present invention is proposed in view of the above circumstances, and the problem to be solved is to provide a seat cushion airbag that can reduce the time lag between the occurrence of the impact and the upward deformation of the seat cushion airbag and stably restrain the upper body of the occupant with the shoulder belt, and a seat cushion airbag device including the seat cushion airbag.

[0018] The seat cushion airbag of the present invention for solving the above problems is connected to an inflation fluid generating source, and inflates by supplying inflation fluid to the inside. Among them,

[0019] In the seat part of a vehicle seat, it is arranged in a region below the seat surface and between the central part and the front end part in the front-rear direction of the seat part.

[0020] When inflating,

[0021] It has side parts between the top and the bottom.

[0022] At least two opposite regions in the side parts have vertical walls extending in the up-down direction.

[0023] The seat cushion airbag device of the present invention for solving the above problems has:

[0024] An inflation fluid generating source; and

[0025] A seat cushion airbag, which is connected to the inflation fluid generating source, inflates by supplying inflation fluid to the inside. Among them,

[0026] The seat cushion airbag is arranged in a region below the seat surface and between the central part and the front end part in the front-rear direction of the seat part of a vehicle seat.

[0027] When inflating,

[0028] It has side parts between the top and the bottom.

[0029] At least two opposite regions in the side parts have vertical walls extending in the up-down direction.

[0030] According to the seat cushion airbag and the seat cushion airbag device of the present invention, it is possible to reduce the time lag between the generation of impact and the upward deformation of the seat cushion airbag, and to stably restrain the upper body of the occupant by using the shoulder strap. Description of the Drawings

[0031] Figure 1 It is an explanatory diagram schematically illustrating the seat cushion airbag of Embodiment 1 and the seat cushion airbag device of Embodiment 1.

[0032] Figure 2 It is an explanatory diagram schematically illustrating the seat cushion airbag of Embodiment 1.

[0033] Figure 3 It is an explanatory diagram schematically illustrating the seat cushion airbag of Embodiment 1.

[0034] Figure 4It is an explanatory diagram schematically illustrating the seat cushion airbag of Embodiment 1.

[0035] Figure 5 It is an explanatory diagram schematically illustrating the seat cushion airbag of Embodiment 1.

[0036] Figure 6 It is an explanatory diagram schematically illustrating the seat cushion airbag of Embodiment 2.

[0037] Figure 7 It is an explanatory diagram schematically illustrating the seat cushion airbag of Embodiment 2.

[0038] Figure 8 It is an explanatory diagram schematically illustrating the seat cushion airbag of Embodiment 3.

[0039] Figure 9 It is an explanatory diagram schematically illustrating the seat cushion airbag of Embodiment 4.

[0040] Figure 10 It is an explanatory diagram schematically illustrating the upper sheet of the seat cushion airbag of Embodiment 4.

[0041] Figure 11 It is an explanatory diagram schematically illustrating the lower sheet of the seat cushion airbag of Embodiment 4.

[0042] Figure 12 It is an explanatory diagram schematically illustrating the situation of observing the seat cushion airbag of Embodiment 5 from the side and the rear.

[0043] Figure 13 It is an explanatory diagram schematically illustrating the current type of seat cushion airbag.

[0044] Figure 14 It is an explanatory diagram schematically illustrating the current type of seat cushion airbag.

[0045] Figure 15 It is an explanatory diagram schematically illustrating the current type of seat cushion airbag.

[0046] Figure 16 It is an explanatory diagram schematically illustrating the current type of seat cushion airbag.

[0047] Figure 17 It is an explanatory diagram schematically illustrating one mode of the seat cushion airbag of the present invention.

[0048] Figure 18 It is an explanatory diagram schematically illustrating one mode of the seat cushion airbag of the present invention.

[0049] Figure 19This is an explanatory diagram schematically illustrating one mode of the seat cushion airbag of the present invention.

[0050] Figure 20 This is an explanatory diagram schematically illustrating one mode of the seat cushion airbag of the present invention.

[0051] Figure 21 This is an explanatory diagram schematically illustrating one mode of the seat cushion airbag of the present invention. Detailed implementation mode

[0052] The seat cushion airbag device of the present invention has an inflation fluid generating source on the basis of the seat cushion airbag of the present invention. Therefore, the following description of the seat cushion airbag of the present invention can be replaced with the seat cushion airbag of the seat cushion airbag device of the present invention.

[0053] The seat cushion airbag of the present invention is connected to an inflation fluid generating source.

[0054] When an impact occurs, the inflation fluid generated by the inflation fluid generating source is supplied to the inside, so that the seat cushion airbag of the present invention expands and inflates.

[0055] In addition, the seat cushion airbag is disposed in a region below the seat surface and between the central portion and the front end portion in the front-rear direction of the seat portion of the vehicle seat.

[0056] In addition, in this specification, "rear" refers to the opposite direction of the above-mentioned "front". And "upper" and "lower" refer to the upper side and the lower side in the vertical direction in the seat cushion airbag in the state of the seat portion of the seat mounted on the vehicle.

[0057] The seat cushion airbag of the present invention expands and inflates, thereby causing the region between the central portion and the front end portion in the front-rear direction in the seat portion to deform upward. At least a part of the region between the central portion and the front end portion in the front-rear direction in the seat portion coincides with the region from the ischium to the thigh portion of the occupant sitting on the seat portion of the seat. Therefore, at this time, the region from the ischium to the thigh portion of the occupant sitting on the seat portion of the seat is raised, and as a result, the waist of the occupant is raised.

[0058] As Figures 13 to 15 shown, a general current-type seat cushion airbag is formed by sewing an upper sheet 150u forming the top 111t of the seat cushion airbag 111 and a lower sheet 150l forming the bottom 111b of the seat cushion airbag 111.

[0059] The seam 130 between the upper sheet 150u and the lower sheet 150l is formed along the peripheral portion of the upper sheet 150u and the lower sheet 150l over the entire circumference in the circumferential direction.

[0060] In addition,Figure 13 is an explanatory diagram schematically showing a general current-type seat cushion airbag as viewed from above. Figure 14 is an explanatory diagram schematically showing the current-type seat cushion airbag in a state with a relatively high internal pressure as viewed from the front. Figure 15 is an explanatory diagram schematically showing the current-type seat cushion airbag in a state with a relatively low internal pressure as viewed from the front. Figure 16 is an explanatory diagram schematically showing the seat cushion airbag with a relatively low internal pressure and a relatively large outer shape as viewed from the front.

[0061] The current-type seat cushion airbag is formed in a flat shape that has almost no thickness in the vertical direction in its normal state, that is, when it is neither deployed nor inflated. Moreover, regarding the current-type seat cushion airbag, as Figure 14 shown, when it is deployed and inflated upon impact, the lower sheet 150l expands downward to form the bottom 111b, and then the upper sheet 150u expands upward to form the top 111t.

[0062] Here, regarding the above-mentioned current-type seat cushion airbag, in order to form a shape that has almost no thickness in the vertical direction in its normal state, it is difficult to say that it is easy to deform in the vertical direction, especially upward. Therefore, regarding the current-type seat cushion airbag, if the internal pressure during deployment and inflation is relatively low, the position above the top also decreases.

[0063] Upon impact, in order to stably restrain the upper body of the occupant using the shoulder belt, it is necessary to support the waist of the occupant sitting on the seat with sufficient force from below. Therefore, preferably, during deployment and inflation, the seat cushion airbag deforms significantly upward and raises the position above the top to a certain extent.

[0064] Therefore, regarding the current-type airbag, as Figure 14 shown, the internal pressure of the seat cushion airbag during deployment and inflation is set to a relatively high value. And thereby, the seat cushion airbag 111 deforms significantly upward to a certain extent, and further raises the position above the top 111t.

[0065] In contrast, in the case where the internal pressure of the seat cushion airbag 111 during deployment and inflation is set to a relatively low value in order to reduce the time lag between impact and upward deformation of the seat cushion airbag as described above, the position above the top 111t also decreases ( Figure 15 ).

[0066] If the outer shape of the seat cushion airbag is enlarged, even if the internal pressure of the seat cushion airbag 111 during deployment and inflation is reduced to a certain extent, the position above the top 111t can be raised ( Figure 16 ).

[0067] However, in this case, there is a problem that the outer shape of the seat cushion airbag 111 becomes too large, and it is difficult to say that it is suitable for being arranged in the seat part of a general seat.

[0068] The inventor of the present invention carefully designed the shape of the seat cushion airbag, and expected to reduce the time lag between the generation of impact and the upward deformation of the seat cushion airbag by setting it to a shape that is easily deformed upward.

[0069] If the seat cushion airbag is of this shape, its outer shape will not become too large, and even if the internal pressure during deployment and inflation decreases to a certain extent, the position above the top can be sufficiently raised.

[0070] Specifically, the seat cushion airbag of the present invention has side portions between the top and the bottom when deployed and inflated. Moreover, at least two opposite regions in the side portions have vertical walls extending in the vertical direction.

[0071] Regarding the seat cushion airbag of the present invention, the vertical walls included in the side portions extend in the vertical direction when deployed and inflated. Therefore, when deployed and inflated, the vertical walls guide the deformation direction of the seat cushion airbag in such a way that the position above the top is raised.

[0072] It can be said that the vertical walls also help the seat cushion airbag to be greatly deformed upward when deployed and inflated.

[0073] According to the seat cushion airbag of the present invention having such vertical walls in the side portions, even if the internal pressure during deployment and inflation is not too high, the position above the top is sufficiently raised.

[0074] Thus, the seat cushion airbag of the present invention can support the waist of the occupant sitting on the seat with sufficient force from below, and further can stably restrain the upper body of the occupant by using the shoulder straps.

[0075] In addition, according to the seat cushion airbag of the present invention, it is not necessary to set the internal pressure during deployment and inflation to be high, so the time lag between the generation of impact and the upward deformation of the seat cushion airbag can be reduced.

[0076] Next, each structural element of the seat cushion airbag of the present invention and the seat cushion airbag device of the present invention will be described.

[0077] Unless otherwise specified, the numerical range “x to y” described in this specification includes the lower limit x and the upper limit y. Moreover, including the above upper limit value, lower limit value, and the numerical values listed in the embodiments, they can be arbitrarily combined to form a new numerical range. And, the numerical values arbitrarily selected from the above arbitrary numerical ranges can be set as the upper limit and lower limit numerical values of the new numerical range.

[0078] The seat cushion airbag of the present invention is connected to an inflation fluid generating source, and inflates by supplying inflation fluid to the inside. Among them,

[0079] In the seat part of a vehicle seat, it is arranged in a region below the seat surface and between the central part and the front end part in the front-rear direction of the seat part.

[0080] When inflating,

[0081] It has side parts between the top and the bottom.

[0082] At least two relatively opposed regions in the side parts have vertical walls extending in the up-down direction.

[0083] The seat cushion airbag device of the present invention has an inflation fluid generating source on the basis of the above-mentioned seat cushion airbag of the present invention.

[0084] The seat cushion airbag of the present invention is arranged in the seat part of a vehicle seat. The seat part is the part where the occupant of the seat sits, and may include a frame and a seat cushion fixed to the frame. In addition, the seat may have a backrest, armrests, etc. in addition to the seat part.

[0085] The seat on which the seat cushion airbag of the present invention is mounted is not particularly limited. For example, it can be a front seat such as a driver's seat or a passenger seat, or a rear seat.

[0086] The seat cushion airbag of the present invention is arranged in a region between the central part and the front end part in the front-rear direction of the seat part. In this specification, the "region between the central part and the front end part in the front-rear direction of the seat part" is referred to as the front side region of the seat part as needed.

[0087] Regarding the seat cushion airbag of the present invention, its whole can be arranged in the front side region of the above-mentioned seat part, and a part of it can be arranged more rearward than the front side region of the seat part.

[0088] Regarding the seat cushion airbag of the present invention, when a part of it is arranged more rearward than the front side region of the seat part, it is preferable that a larger part of the seat cushion airbag is arranged in the front side region of the seat part.

[0089] Specifically, in a projection view of projecting the seat part and the seat cushion airbag arranged in the seat part from above to below, it is preferable that a part of the seat cushion airbag greater than or equal to 30% of the area is arranged in the front side region of the seat part.

[0090] The seat cushion airbag of the present invention is arranged in the seat part as described above, and deforms when inflating and presses the seat surface of the seat part upward.

[0091] Preferably, this seat cushion airbag is folded in its normal state or stored in the seat portion in a flattened state. As the material of this seat cushion airbag, a material that can be folded and unfolded is preferably selected.

[0092] As the material of a specific seat cushion airbag, a material having flexibility and high strength is preferably selected. For example, a woven fabric made of high-strength resin fibers such as polyester and polyamide can be particularly preferably used.

[0093] The seat cushion airbag of the present invention is connected to an inflation fluid generating source for supplying an inflation fluid to the inside of the seat cushion airbag.

[0094] The inflation fluid generating source preferably employs a so-called inflator that generates gas as the inflation fluid, and in some cases, an inflation fluid other than gas, such as a liquid or a gel, can be generated.

[0095] The inflation fluid generating source may be any device for supplying an inflation fluid to the airbag. For example, it may have a so-called pilot type structure having a gas generating agent that generates gas as the inflation fluid, or a so-called hybrid type structure that breaks the partition wall of a high-pressure container and supplies the gas stored in the high-pressure container. The inflation fluid generating source may have its entire body disposed outside the seat cushion airbag, or a part or the entire body may be disposed inside the seat cushion airbag.

[0096] The seat cushion airbag of the present invention has a side portion between the top and the bottom when inflated and expanded. The side portion may be formed only when inflated and expanded, or may be formed in normal times other than when inflated and expanded.

[0097] Here, the top refers to a region including the upper end portion when the seat cushion airbag mounted on the seat portion is inflated and expanded, and a peripheral portion that is smoothly continuous with respect to the upper end portion. The size and shape of the top may be any shape corresponding to the shape of the seat cushion airbag, and may be either linear or planar.

[0098] The top may extend three-dimensionally in the vertical direction, and its length in the vertical direction varies depending on the shape of the seat cushion airbag, and thus is not particularly limited. Sometimes, the side portion including the standing wall is formed continuously with respect to the top, and the boundary between the top and the side portion and the standing wall is blurred.

[0099] In contrast, the bottom refers to a region including the lower end portion when the seat cushion airbag mounted on the seat portion is inflated and expanded, and a peripheral portion that is smoothly continuous with respect to the lower end portion. In addition, the size and shape of the bottom may also be any shape corresponding to the shape of the seat cushion airbag, and may be either linear or planar.

[0100] In addition, the bottom can also extend three-dimensionally in the up-and-down direction, and its length in the up-and-down direction varies according to the shape of the seat cushion airbag, so it is not particularly limited. Sometimes the side part including the vertical wall is formed continuously with respect to the bottom, and the boundaries between the bottom, the side part, and the vertical wall are blurred.

[0101] The side part exists between the above-mentioned top and bottom when inflated. When inflated, the top and bottom are in different positions in the up-and-down direction. Therefore, it can be said that the side part exists between the top and bottom in the up-and-down direction of the seat cushion airbag. This side part exists between the top and bottom throughout the entire circumference of the seat cushion airbag.

[0102] In this specification, the circumferential direction of the seat cushion airbag refers to the direction in which the side part of the seat cushion airbag extends.

[0103] In addition, the above-mentioned top, bottom, and side part are Figures 13 to 16 parts that also exist in the current type of seat cushion airbag shown.

[0104] The seat cushion airbag of the present invention has vertical walls extending in the up-and-down direction in at least two opposite regions of the above-mentioned side part.

[0105] The vertical walls of the seat cushion airbag of the present invention can be formed only as a part of the above-mentioned side part, or can be formed as the whole of the side part. In other words, the vertical walls can exist between the top and bottom only in a part of the circumferential direction of the seat cushion airbag, or can exist between the top and bottom throughout the entire circumference of the seat cushion airbag.

[0106] It can be said that the vertical walls of the seat cushion airbag of the present invention are formed in a gusset shape, that is, in the form of a so-called inserted cloth added to the current type of seat cushion airbag formed only by an upper sheet and a lower sheet for the part with insufficient thickness. Figures 13 to 16 shown.

[0107] For example, the vertical walls of the seat cushion airbag of the present invention can be integrally formed with the top and / or the bottom. Alternatively, the vertical walls can be separately formed from the top and / or the bottom and then joined to the top and / or the bottom to be integrated.

[0108] In addition, in this specification, joining means a concept including sewing with a sewing thread, binding with various joining members represented by staples of a stapler, bonding with an adhesive, and welding.

[0109] For example, as Figure 17 shown, the gusset body 50s of the seat cushion airbag 11 of the present invention, which is separate from the upper sheet 50u and the lower sheet 50l, can be formed by being respectively joined to and integrated with the upper sheet 50u and the lower sheet 50l. If this seat cushion airbag 11 is inflated, a part of the gusset body 50s forms the vertical wall 20.

[0110] In addition, Figure 17 and Figure 18 is an explanatory diagram schematically illustrating one mode of the seat cushion airbag of the present invention. More specifically, it schematically illustrates a case where the seat cushion airbag is cut along the width direction, that is, the left-right direction shown in each figure.

[0111] Figure 17 The seat cushion airbag 11 of the present invention shown is folded or flattened in a normal state, as Figure 18 shown. The seat cushion airbag 11 is inflated by supplying inflation fluid from an inflation fluid generating source (not shown) and expands as Figure 17 shown.

[0112] As Figure 17 shown, with respect to the seat cushion airbag 11, when it expands and inflates, the standing wall 20 extends in the up-down direction. Thus, the standing wall 20 guides the deformation direction of the seat cushion airbag 11 in a manner that raises the position above the top 11t.

[0113] In addition, as Figure 17 and Figure 18 shown, with respect to the seat cushion airbag 11, there is a seam (specifically, seam 30) between the standing wall 20 and the top 11t at the upper end of the standing wall 20, and there is a seam (i.e., seam 30) between the standing wall 20 and the bottom 11b at the lower end of the standing wall 20. The seam between the standing wall 20 and the top 11t can be renamed as the seam between the inner lining body 50s and the upper sheet 50u. In addition, the seam between the standing wall 20 and the bottom 11b can be renamed as the seam between the inner lining body 50s and the lower sheet 50l.

[0114] The portion of the standing wall 20 near the seam 30 is higher in rigidity than the other portion of the standing wall 20 (which may be referred to as the normal portion 21 of the standing wall 20 as needed). Therefore, the portion of the standing wall 20 near the seam is more difficult to deform than the normal portion of the standing wall 20 and is likely to maintain its shape.

[0115] Therefore, with respect to the seat cushion airbag 11 of this mode, when it expands and inflates, the normal portion 21 of the standing wall 20 deforms preferentially to guide the deformation direction of the seat cushion airbag 11 in a manner that raises the position above the top 11t.

[0116] Therefore, in this case, when expanding and inflating, even if the internal pressure of the seat cushion airbag 11 is not too high, the position above its top 11t is sufficiently raised.

[0117] In addition, in this mode, substantially the entire upper sheet 50u forms the top 11t of the seat cushion airbag 11.

[0118] In addition, for example, asFigure 19 As shown, the lining body 50s and the upper sheet 50u of the seat cushion airbag 11 of the present invention may be integrally formed, and the integrally formed body of the upper sheet 50u and the upright wall 20 is sewn together with the lower sheet 50l to form an integral body.

[0119] The seat cushion airbag 11 of this embodiment can also be said to have the upright wall 20 formed by a part of the upper sheet 50u.

[0120] In addition, in this aspect, it can also be said that the upright wall 20 functions as a lining between the top portion 11 t and the bottom portion 11 b .

[0121] For reference, Figure 19 and Figure 20 1 is an explanatory diagram schematically illustrating one embodiment of the seat cushion airbag of the present invention, and more specifically, schematically illustrating a state where the seat cushion airbag is cut along the width direction.

[0122] In addition, the seat cushion airbag 11 of this method is also in a normal state, such as Figure 20 Furthermore, if an inflation fluid is supplied from an inflation fluid generating source (not shown), the seat cushion airbag 11 is folded or flattened as shown. Figure 19 Shown unfolded and expanded.

[0123] like Figure 19 As shown, regarding the seat cushion airbag 11, when it is deployed and inflated, the vertical wall 20, which is another part of the upper sheet 50u and extends in the up-down direction, guides the deformation direction of the seat cushion airbag 11 in the up-down direction in such a way that the position above the top 11t, which is a part of the upper sheet 50u, is raised.

[0124] Therefore, in this case, even if the internal pressure of the seat cushion airbag 11 is not too high when it is deployed and inflated, the position above the top portion 11 t thereof is sufficiently raised.

[0125] And, for example Figure 21 As shown, the top 11t, bottom 11b and vertical wall 20 of the seat cushion airbag 11 of the present invention can be divided into a plurality of parts. Furthermore, the part of the top 11t, the part of the vertical wall 20 continuous with the part of the top 11t, and the part of the bottom 11b continuous with the part of the vertical wall 20 can be integrally molded to form one airbag part 11d.

[0126] The seat cushion airbag 11 of this embodiment can be said to be formed by joining and integrating four airbag separate bodies 11 d .

[0127] At the top 11t of the seat cushion airbag 11 in this mode, there is a seam 30 between a part of a certain airbag segment 11d that forms the top 11t and a part of another adjacent airbag segment 11d that forms the top 11t.

[0128] In addition, at the bottom 11b of the seat cushion airbag 11 in this mode, there is a seam 30 between a part of a certain airbag segment 11d that forms the bottom 11b and a part of another adjacent airbag segment 11d that forms the bottom 11b.

[0129] Moreover, at the vertical wall 20 of the seat cushion airbag 11 in this mode, there is a seam 30 between a part of a certain airbag segment 11d that forms the vertical wall 20 and a part of another adjacent airbag segment 11d that forms the vertical wall 20.

[0130] In this case, when the seat cushion airbag that is folded or flattened in the normal state expands, the vertical wall extending in the up and down direction also guides the deformation direction of the seat cushion airbag in such a way that the position above the top is raised.

[0131] Therefore, in this case, even if the internal pressure of the seat cushion airbag during expansion is not too high, the position above its top is sufficiently raised.

[0132] Preferably, the vertical wall folds back to the inside or outside of the seat cushion airbag in the normal state. Thus, there is an advantage that it is easy to flatten or fold in such a way that the length of the vertical wall in the up and down direction increases during expansion and the outer shape of the seat cushion airbag shrinks in the normal state.

[0133] As described above, in the case where the vertical wall folds back to the inside or outside of the seat cushion airbag in the normal state, it is also preferable to form a stitched seam, a seam at the crease portion of the vertical wall. Thus, the rigidity of the crease portion is improved, and it is easy to maintain the shape of the crease in the normal state.

[0134] The seat cushion airbag of the present invention only needs to have vertical walls extending in the up and down direction in at least two relatively opposed regions on the side, and the length of the vertical walls in the up and down direction is not particularly limited. In addition, the vertical walls can be continuous throughout the up and down direction or can have seams at any part in the up and down direction.

[0135] Regarding the seat cushion airbag of the present invention, in order to further raise the position above the top during expansion, it is preferable to set the length of the vertical wall in the up and down direction, that is, the height of the vertical wall, to be large.

[0136] Regarding the vertical length of the standing wall of the seat cushion airbag of the present invention, when it is deployed and inflated, when its internal pressure is set to 175 kPa, it is preferably greater than or equal to 120 mm. There is no particular upper limit for the vertical length of the standing wall. If forced to list, it is sufficient as long as it is less than or equal to 300 mm.

[0137] In addition, for reference, the internal pressure of the above-mentioned current type of seat cushion airbag during deployment and inflation is about 350 kPa.

[0138] Regarding the seat cushion airbag of the present invention, when the standing walls are in two opposite regions on the side, the standing walls in these two regions can have the same shape or different shapes. And in this case, the vertical lengths of the respective standing walls can be the same or different.

[0139] When the standing wall exists throughout the entire circumference of the seat cushion airbag, the vertical length of the standing wall can be the same or different throughout the entire circumference. In order to suppress the above-mentioned diving phenomenon, it is preferable that the vertical length of the front side portion of the standing wall is greater than the vertical length of the rear side portion.

[0140] As described above, the standing wall can be integrally formed with the top and / or the bottom, but it is more preferable that the standing wall formed separately from the top and the bottom is joined to the top and / or the bottom to be integrated. By sandwiching the normal portion of the standing wall by the portions with higher rigidity, that is, the seams between the top and the standing wall and the seams between the bottom and the standing wall, when it is deployed and inflated, the force for the normal portion to deform in the vertical direction is difficult to be transmitted from the normal portion to the top side and is difficult to be transmitted from the normal portion to the bottom side. For example, it can also be considered that when the normal portion deforms in the vertical direction during deployment and inflation, the upper sheet and the lower sheet are flexurally deformed accordingly. When the upper sheet and the lower sheet are flexurally deformed in this way, it may hinder the vertical deformation of the normal portion.

[0141] By sandwiching the normal portion by the above-mentioned seams, it is difficult to hinder the vertical deformation of the normal portion. Thus, even when the internal pressure during deployment and inflation is low, the vertical length of the seat cushion airbag is sufficiently increased.

[0142] Regarding the seat cushion airbag of the present invention, in order to stably support the waist of the occupant sitting on the seat from below, it is preferable to increase the length in the width direction of the seat cushion airbag to a certain extent. The reasons are as follows.

[0143] For example, regarding Figures 13 to 15 the current type of seat cushion airbag shown, if the internal pressure during deployment and inflation ( Figure 14), the position above the top of the seat cushion airbag rises to a certain extent. Therefore, according to the current type of seat cushion airbag, it is possible to support from below the part near the ischium of the occupant sitting on the seat part.

[0144] However, in this case, regarding the peripheral portion of the top of the current type of seat cushion airbag, the position above is not very high. Therefore, regarding the current type of seat cushion airbag, it is difficult to stably support the occupant's buttocks from below.

[0145] In contrast, regarding the seat cushion airbag of the present invention, due to the presence of the standing wall, a large area of the upper sheet material rises upward when deployed and inflated, and the area of the top can be increased. Therefore, regarding the seat cushion airbag of the present invention, if the length in the width direction is increased, not only the vicinity of the occupant's ischium but also the vicinity of the buttocks can come into contact with the top, the area of the part of the top that comes into contact with the occupant and supports the occupant can be increased, and the occupant can be supported from below by the seat cushion airbag. Moreover, thereby, the downward load acting on the seat cushion airbag due to the occupant can be dispersed to a larger part of the seat cushion airbag.

[0146] That is, regarding the seat cushion airbag of the present invention, by increasing the length in the width direction, even if the internal pressure of the seat cushion airbag during deployment and inflation is reduced, the occupant can be very stably supported from below by the seat cushion airbag.

[0147] Specifically, it is preferable that the length of the seat cushion airbag of the present invention in the width direction is greater than or equal to 280 mm. Or, when the length in the width direction of the seat part is set to 100%, it is preferable that the size of the seat cushion airbag of the present invention is greater than or equal to 70%.

[0148] Regarding the seat cushion airbag of the present invention, the length in the front-rear direction is not particularly limited, and it can be of the same degree as the length in the width direction or greater than the length in the width direction. However, if the seat cushion airbag is made compact, the weight reduction of the seat cushion airbag can be achieved.

[0149] Therefore, it is preferable that the length of the seat cushion airbag of the present invention in the front-rear direction is less than the length in the width direction. In other words, it is preferable that the seat cushion airbag of the present invention has a long side direction and a short side direction, and its long side direction is along the width direction of the seat part.

[0150] Specifically, it is preferable that the length of the seat cushion airbag of the present invention in the front-rear direction is greater than or equal to 25% of the length of the seat cushion airbag in the width direction.

[0151] In addition, in order to more stably support the occupant's buttocks from below using the seat cushion airbag of the present invention, it is preferable that, when inflated, the region of the seat cushion airbag corresponding to the occupant's buttocks and the outer side in the width direction relative to the buttocks is at a higher position above than the region corresponding to the occupant's ischium.

[0152] In other words, it is preferable that the seat cushion airbag of the present invention is arranged in the seat portion such that its long side direction is along the width direction of the seat portion, and the top of the seat cushion airbag has raised portions at both ends in the long side direction. It can be said that the raised portions are at a higher position above than the central portion in the long side direction when inflated.

[0153] Specifically, regarding the seat cushion airbag of the present invention, preferably, when inflated, the raised portions and the central portion in the long side direction are separated in the vertical direction by a distance of 5 mm or more.

[0154] Regarding the seat cushion airbag of the present invention, the top and the bottom can be connected by a lace. The lace is a member having a shape such as a cord shape, a strip shape, or a thread shape, and is also called a tether or a strap. By connecting the top and the bottom using the lace, the position above the top can be controlled with high precision when inflated. This helps to more stably support the occupant's waist from below using the seat cushion airbag of the present invention.

[0155] Similarly, regarding the seat cushion airbag of the present invention, it is preferable to connect the opposing side walls to each other using a lace, in other words, to connect the pair of side walls to each other. By connecting the side walls to each other using the lace, there is an advantage that the relative positions of the side walls can be controlled with high precision when inflated.

[0156] In the case where the seat cushion airbag of the present invention is in this manner, it is particularly preferable that the side walls are at both ends in the long side direction of the seat cushion airbag and the long side direction of the seat cushion airbag is along the width direction of the seat portion.

[0157] In this case, by precisely controlling the length in the width direction of the seat cushion airbag when inflated, the occupant's waist can be more stably supported from below using the seat cushion airbag.

[0158] Next, specific examples will be given to illustrate the seat cushion airbag and the seat cushion airbag device of the present invention.

[0159] (Example 1)

[0160] In Figure 1 a schematic explanatory view is shown for explaining the case where the seat cushion airbag of Example 1 and the seat cushion airbag device of Example 1 are mounted on the seat portion of the seat. In Figure 2FIG. shows an explanatory view schematically illustrating the case of the seat cushion airbag of Embodiment 1 as viewed from above. In Figure 3 FIG. shows an explanatory view schematically illustrating the case of the seat cushion airbag of Embodiment 1 as viewed from the side. In Figure 4 FIG. shows an explanatory view schematically illustrating the case of the seat cushion airbag of Embodiment 1 as viewed from the side and the rear. In Figure 5 FIG. shows an explanatory view schematically illustrating the case of the seat cushion airbag of Embodiment 1 cut along the long side direction.

[0161] Hereinafter, in Embodiment 1, up, down, left, right, front, and rear refer to up, down, left, right, front, and rear shown in each figure. The left-right direction coincides with the width direction.

[0162] As Figure 1 shown, the seat cushion airbag device 1 of Embodiment 1 includes the seat cushion airbag 11 of Embodiment 1 and an inflation fluid generation source 10.

[0163] The seat cushion airbag device of Embodiment 1 is mounted on a vehicle seat 90. More specifically, it is disposed below a seat cushion (not shown) in the seat portion 91 of the seat 90. Since the seat surface 93 of the seat portion 91 is constituted by the upper surface of the seat cushion, the seat cushion airbag device 1 of Embodiment 1 can also be disposed below the seat surface 93 in the seat portion 91.

[0164] The seat cushion airbag 11 is inside the seat portion 91 and is located above a seat bar 92 that spans in the width direction near the central portion in the front-rear direction thereof. Therefore, it can be said that the seat cushion airbag 11 is disposed in the region between the central portion and the front end portion in the front-rear direction of the seat portion 91, that is, the front side region 91f.

[0165] More specifically, in a projection view of the seat portion 91 and the seat cushion airbag 11 disposed in the seat portion 91 projected from above toward below, a portion greater than or equal to 50% of its area is disposed in the front side region 91f.

[0166] The inflation fluid generation source 10 is disposed inside the seat cushion airbag 11 and is disposed more forward than the seat bar 92.

[0167] The inflation fluid generation source 10 of the seat cushion airbag device 1 of Embodiment 1 is an inflator that generates a gas as an inflation fluid, is connected to a control device (not shown) for deploying and inflating the seat cushion airbag 11, and performs an operation by receiving power supply. This control device is an electronic control unit (ECU) of the vehicle.

[0168] As Figure 2As shown, the seat cushion airbag 11 of Embodiment 1 is a structure formed by sewing an upper sheet 50u, a lower sheet 50l, two inner linings 50s, and a lacing 60.

[0169] The upper sheet 50u forms the top 11t of the seat cushion airbag 11, and the lower sheet 50l forms the bottom 11b of the seat cushion airbag 11.

[0170] The upper sheet 50u, the lower sheet 50l, and the inner linings 50s are each made of a polyester woven fabric. Among them, the upper sheet 50u and the lower sheet 50l are substantially the same shape, such that the long side direction faces the left - right direction and the short side direction faces the front - back direction. Therefore, it can be said that the long side direction of the seat cushion airbag 11 is along the width direction.

[0171] As Figure 2 , Figure 3 and Figure 4 shown, for the upper sheet 50u and the lower sheet 50l, they are sewn and integrated at the front - side part and the rear - side part of their peripheral portions. It can be said that for the upper sheet 50u and the lower sheet 50l, they are sewn and integrated at both ends in their short side direction respectively.

[0172] One inner lining 50s is disposed at each of the two end portions in the long side direction of the seat cushion airbag 11. The upper side portion of each inner lining 50s is sewn and integrated with the end portion in the long side direction of the upper sheet 50u. The lower side portion of each inner lining 50s is sewn and integrated with the end portion in the long side direction of the lower sheet 50l.

[0173] As Figure 2 shown, the seams 30 of the upper sheet 50u, the lower sheet 50l, and the two inner linings 50s are formed along the entire circumference of the peripheral portion of the upper sheet 50u and the lower sheet 50l. As Figure 3 shown, it can be said that the seam 30 is formed along the entire circumference of the peripheral portion of each inner lining 50s. Thus, the seat cushion airbag 11 of Embodiment 1 is formed in an approximate box shape.

[0174] Regarding the seat cushion airbag 11 of Embodiment 1, at both ends in its short side direction, the seam 30 of the upper sheet 50u and the lower sheet 50l and the portions near it form a part of the side portion 11s. In addition, at both ends of the long side of the seat cushion airbag 11, the portion between the seam 30 of the upper sheet 50u and the inner lining 50s and the seam 30 of the lower sheet 50l and the inner lining 50s forms the remaining part of the side portion 11s. This portion is also a vertical wall 20 extending in the up - down direction.

[0175] As Figure 2 shown, regarding the seat cushion airbag 11 of Embodiment 1, the top 11t and the bottom 11b are connected by a lacing 60. The lacing 60 is disposed inside the seat cushion airbag 11.

[0176] The seat cushion airbag 11 of Example 1 is folded in its normal state. By supplying an expansion fluid from the expansion fluid generating source 10, the seat cushion airbag 11 expands as shown Figures 2 to 4 herein

[0177] The seat cushion airbag 11 of Example 1 is arranged such that its long side direction is along the left - right direction as the width direction and is disposed on the seat portion 91. Moreover, the central portion in the long side direction of the top portion 11t and the central portion in the long side direction of the bottom portion 11b are connected by a lace 60. Therefore, when expanding, the central portion in the long side direction of the top portion 11t is at a lower position above compared to the both end portions in the long side direction of the top portion 11t

[0178] That is, the top portion 11t of the seat cushion airbag 11 of Example 1 has raised portions 40 at both end portions in its long side direction. Moreover, when expanding, the raised portions 40 are at a higher position above compared to the central portion 41 in the long side direction

[0179] The seat cushion airbag 11 of Example 1 has standing walls 20 extending in the up - down direction in regions at both ends in the long side direction of its side portion 11s. The standing walls 20 deform in the up - down direction when expanding. Therefore, the deformation direction of the seat cushion airbag 11 of Example 1 when expanding is guided in the up - down direction by the standing walls 20

[0180] Thus, according to the seat cushion airbag 11 of Example 1, even if the internal pressure when expanding is not too high, the position above the top portion 11t is sufficiently raised. Thereby, the seat cushion airbag 11 of Example 1 can support the waist of the occupant sitting on the seat 90 with sufficient force from below, and further can stably restrain the upper body of the occupant by using a shoulder strap (not shown).

[0181] In addition, according to the seat cushion airbag 11 of Example 1, it is not necessary to set the internal pressure when expanding to be high, so that the impact and the time lag of the upward deformation of the seat cushion airbag 11 can be reduced

[0182] Moreover, the seat cushion airbag 11 of Example 1 is arranged on the seat portion 91 such that its long side direction is along the width direction, and has raised portions 40 at both end portions in the long side direction of the top portion 11t, so that the entire buttocks of the occupant can be supported from below

[0183] According to the seat cushion airbag 11 of this Example 1, the downward load acting on the seat cushion airbag 11 due to the occupant can be dispersed to a larger part of the seat cushion airbag 11. Thus, regarding the seat cushion airbag 11 of Example 1, even if the internal pressure of the seat cushion airbag 11 when expanding is reduced, the occupant can be very stably supported from below by the seat cushion airbag 11

[0184] For reference, the length of the seat cushion airbag 11 of Example 1 in the long side direction, which is the width direction of the seat part 91, is about 400 mm, and is greater than or equal to 90% when the width direction length of the seat part 91 is set to 100%.

[0185] When its internal pressure is set to 175 kPa, the length of the vertical wall 20 in the up and down direction is about 150 mm when expanded.

[0186] In addition, the length of the seat cushion airbag 11 of Example 1 in the short side direction, which is the front and back direction of the seat part 91, is about 140 mm, and is about 35% of the length of the seat cushion airbag 11 in the width direction.

[0187] Moreover, when the raised part 40 of the top part 11t and the central part 41 in the long side direction are expanded, they are separated by a distance of about 20 mm in the up and down direction.

[0188] (Example 2)

[0189] In Figure 6 shows an explanatory diagram schematically illustrating the case of observing the seat cushion airbag of Example 2 from above. In Figure 7 shows an explanatory diagram schematically illustrating the case of observing the seat cushion airbag of Example 2 from the side.

[0190] The seat cushion airbag 11 of Example 2 is quite different from the seat cushion airbag 11 of Example 1 in that the pair of vertical walls 20 are located at the positions, and the top part 11t and the bottom part 11b are connected by the lacing 60 and the two vertical walls 20 are connected by the lacing 60. Moreover, the other structures of the seat cushion airbag 11 of this Example 2 are substantially the same as those of the seat cushion airbag 11 of Example 1.

[0191] As Figure 6 and Figure 7 shown, for the seat cushion airbag 11 of Example 2, the pair of vertical walls 20 are arranged at both ends in the front and back direction, which is the short side direction of the seat cushion airbag 11.

[0192] The upper sheet 50u forms the top part 11t of the seat cushion airbag 11, and the lower sheet 50l forms the bottom part 11b of the seat cushion airbag 11.

[0193] The upper sheet 50u and the lower sheet 50l are of substantially the same shape, with the long side direction facing the left and right directions and the short side direction facing the front and back directions. The upper sheet 50u and the lower sheet 50l are sewn and integrated at the left and right parts of their peripheral edges. It can be said that the upper sheet 50u and the lower sheet 50l are sewn and integrated at both ends of their long side directions respectively.

[0194] One inner lining body 50s is disposed at each of the two end portions of the seat cushion airbag 11 in the short side direction. The upper side portion of each inner lining body 50s is sewn and integrated with the end portion in the short side direction of the upper sheet 50u. The lower side portion of each inner lining body 50s is sewn and integrated with the end portion in the short side direction of the lower sheet 50l.

[0195] As Figure 6 shown, the seams 30 of the upper sheet 50u, the lower sheet 50l, and the two inner lining bodies 50s are formed along the peripheral portion of the upper sheet 50u and the lower sheet 50l over the entire circumference in the circumferential direction. In addition, it can be said that the seam 30 is formed along the peripheral portion of each inner lining body 50s over the entire circumference in the circumferential direction. Thus, the seat cushion airbag 11 of Embodiment 2 is also formed in an approximately box shape.

[0196] Regarding the seat cushion airbag 11 of Embodiment 2, at both end portions in its long side direction, a part of the side portion 11s is formed by the seam 30 of the upper sheet 50u and the lower sheet 50l and the portions in the vicinity thereof. In addition, at both end portions of the short side of the seat cushion airbag 11, the remaining portion of the side portion 11s is formed by the portion between the seam 30 of the upper sheet 50u and the inner lining body 50s and the seam 30 of the lower sheet 50l and the inner lining body 50s. This portion is also a vertical wall 20 extending in the up and down direction.

[0197] As Figure 7 shown, regarding the seat cushion airbag of Embodiment 2, the sizes of the two inner lining bodies 50s are different. Specifically, the length of the front inner lining body 50s in the up and down direction is greater than the length of the rear inner lining body 50s in the up and down direction.

[0198] Therefore, the length of the front vertical wall 20 in the up and down direction is greater than the length of the rear vertical wall 20 in the up and down direction, and the position above the top portion 11t is higher in the front portion of the seat cushion airbag 11 than in the rear portion.

[0199] Regarding the seat cushion airbag 11 of Embodiment 2, the top portion 11t and the bottom portion 11b are connected by a lace 60 ( Figure 6 ). Therefore, the top portion 11t of the seat cushion airbag 11 of Embodiment 2 has the same raised portion 40 as the top portion 11t of the seat cushion airbag 11 of Embodiment 1.

[0200] Regarding the seat cushion airbag 11 of Embodiment 2, the two vertical walls 20 are further connected by a lace 60. Thus, regarding the seat cushion airbag 11 of Embodiment 2, when deployed and inflated, the position above the top portion 11t can be controlled with high precision, and the relative positions of the vertical walls with respect to each other can be controlled with high precision. Thus, the seat cushion airbag 11 of Embodiment 2 can more stably support the occupant's waist from below.

[0201] Regarding the seat cushion airbag 11 of Example 2, similar to the seat cushion airbag 11 of Example 1, it has a standing wall 20 extending in the vertical direction. When the standing wall 20 expands and inflates, it guides the deformation direction of the seat cushion airbag 11 in the vertical direction.

[0202] Therefore, for the seat cushion airbag 11 of Example 2, even if the internal pressure during expansion and inflation is not too high, the position above the top 11t is sufficiently raised. Moreover, thereby, the seat cushion airbag 11 of Example 2 can also support the waist of the occupant sitting on the seat 90 with sufficient force from below, and further can stably restrain the upper body of the occupant by using a shoulder strap (not shown).

[0203] Moreover, for the seat cushion airbag 11 of Example 2, it is not necessary to set the internal pressure during expansion and inflation to be high, so the impact generation and the time lag of the upward deformation of the seat cushion airbag 11 can be reduced.

[0204] (Example 3)

[0205] In Figure 8 shows an explanatory diagram schematically illustrating the case of observing the seat cushion airbag of Example 3 from the side and above.

[0206] As Figure 8 shown, regarding the seat cushion airbag 11 of Example 3, the entire side portion 11s is composed of a standing wall 20.

[0207] Regarding the seat cushion airbag 11 of Example 3, the upper sheet 50u and the lower sheet 50l have substantially the same shape. The inner liner 50s is formed into a long rectangle.

[0208] The upper side portion of the inner liner 50s is sutured and integrated with the peripheral portion of the upper sheet 50u. The lower side portion of the inner liner 50s is sutured and integrated with the peripheral portion of the lower sheet 50l. One end portion and the other end portion of the inner liner 50s in the long side direction are sutured and integrated with each other.

[0209] As Figure 8 shown, the seam 30 of the upper sheet 50u, the lower sheet 50l, and the inner liner 50s is formed along the peripheral portion of the upper sheet 50u and the lower sheet 50l over the entire circumference in the circumferential direction. In addition, the seam 30 is formed along the peripheral portion of each inner liner 50s over the entire circumference in the circumferential direction. Thus, the seat cushion airbag 11 of Example 3 is formed into an approximately cylindrical shape.

[0210] In addition, the seat cushion airbag 11 of Example 3, similar to the seat cushion airbag 11 of Example 1, has a standing wall 20 extending in the vertical direction. When the standing wall 20 expands and inflates, it guides the deformation direction of the seat cushion airbag 11 in the vertical direction.

[0211] Therefore, for the seat cushion airbag 11 according to Embodiment 3, even when the internal pressure during deployment and inflation is not too high, the position above the top portion 11t is sufficiently raised. Moreover, thereby, the seat cushion airbag 11 according to Embodiment 3 can also support the waist of the occupant sitting on the seat 90 with sufficient force from below, and further can stably restrain the upper body of the occupant by using a shoulder strap (not shown).

[0212] Moreover, for the seat cushion airbag 11 according to Embodiment 3, it is not necessary to set the internal pressure during deployment and inflation to be high, so it is possible to reduce the impact and the time lag of the upward deformation of the seat cushion airbag 11.

[0213] (Embodiment 4)

[0214] In Figure 9 there is a explanatory view schematically showing a case of observing the seat cushion airbag of Embodiment 4 from the side and above. In Figure 10 there is a explanatory view schematically showing a case of observing the upper cloth of the seat cushion airbag of Embodiment 4 from above. In Figure 11 there is a explanatory view schematically showing a case of observing the lower cloth of the seat cushion airbag of Embodiment 4 from above.

[0215] As Figure 9 shown, for the seat cushion airbag 11 of Embodiment 4, the entire side portion 11s is also constituted by the vertical wall 20.

[0216] As Figure 10 shown, for the seat cushion airbag 11 of Embodiment 4, the upper sheet 50u and the inner lining body 50s are integrally formed.

[0217] The shape of the lower sheet 50l is substantially the same as the shape of the upper sheet 50u portion of the integrated product of the upper sheet 50u and the inner lining body 50s.

[0218] As Figure 9 shown, the upper side portion of the inner lining body 50s is integrally formed with the peripheral edge portion of the upper sheet 50u. The lower side portion of the inner lining body 50s is sewn and integrated with the peripheral edge portion of the lower sheet 50l. The side end portion of the inner lining body 50s is sewn and integrated with the side end portion of another inner lining body 50s adjacent to the side end portion of the inner lining body 50s. The seat cushion airbag 11 of Embodiment 4 is formed in an approximately square tube shape.

[0219] In addition, the seat cushion airbag 11 of Embodiment 4 also has a vertical wall 20 extending in the vertical direction, similar to the seat cushion airbag 11 of Embodiment 1. This vertical wall 20 guides the deformation direction of the seat cushion airbag 11 in the vertical direction during deployment and inflation.

[0220] Therefore, according to the seat cushion airbag 11 of Embodiment 4, even when the internal pressure during deployment and inflation is not too high, the position above the top 11t is sufficiently elevated.

[0221] Moreover, thereby, the seat cushion airbag 11 of Embodiment 4 can also support the waist of the occupant sitting on the seat 90 with sufficient force from below, and further can stably restrain the upper body of the occupant by using a shoulder strap (not shown).

[0222] Moreover, according to the seat cushion airbag 11 of Embodiment 4, it is not necessary to set the internal pressure during deployment and inflation to be high, so the impact and the time lag of the upward deformation of the seat cushion airbag 11 can be reduced.

[0223] (Embodiment 5)

[0224] In Figure 12 FIG. shows an explanatory diagram schematically illustrating a case of observing the seat cushion airbag of Embodiment 5 from the side and the rear.

[0225] Regarding the seat cushion airbag 11 of Embodiment 5, except for the shapes of the inner liner 50s and the standing wall 20, it is substantially the same as the seat cushion airbag 11 of Embodiment 1.

[0226] The inner liner 50s of the seat cushion airbag 11 of Embodiment 5 is folded back toward the inside of the seat cushion airbag in the normal state. Although not shown, the crease portion 50f of the inner liner 50s is sewn and fixed. Therefore, the length of the standing wall 20 of the seat cushion airbag 11 of Embodiment 5 in the vertical direction during deployment and inflation is greater than that of the standing wall 20 of the seat cushion airbag 11 of Embodiment 1.

[0227] Regarding the seat cushion airbag 11 of Embodiment 5, the substantially central portion of the inner liner 50s is folded back toward the inside, whereby the substantially central portion of the standing wall 20 is also folded back toward the inside. Therefore, regarding the seat cushion airbag 11 of Embodiment 5, the length of the standing wall 20 in the vertical direction during deployment and inflation can be increased, and it can be folded in a manner such that the outer shape of the seat cushion airbag 11 is sufficiently reduced in the normal state.

[0228] In addition, the crease portion 50f of the standing wall 20 is sewn and fixed, so the rigidity of the crease portion 50f is improved, and the shape of the crease is easily maintained in the normal state. Thereby, the seat cushion airbag 11 can be folded more compactly in the normal state.

[0229] The present invention has been described above, but the present invention is not limited to the above-described embodiments and the like. The elements described in the above-described embodiments and the like can be appropriately extracted and combined for implementation, and various modifications can be made without departing from the gist of the present invention.

[0230] In addition, the specification of the present invention not only discloses the citation relationships of the respective claims in the original application, but also discloses the technical idea of appropriately combining the matters described in the respective claims.

[0231] Description of reference numerals

[0232] 1: Seat cushion airbag device, 10: Inflation fluid generating source, 11: Seat cushion airbag, 11t: Top, 11b: Bottom, 11s: Side, 20: Upright wall, 40: Bulge, 90: Seat, 91: Seat portion, 93: Seat surface

Claims

1. A seat cushion airbag connected to an inflation fluid source and supplied with inflation fluid to expand, wherein: The seat portion of the vehicle seat is arranged below the seat surface and in a region between a center portion and a front end portion of the seat portion in a front-rear direction. When expanding, having a side portion between the top portion and the bottom portion, At least two opposing regions of the side portion have vertically extending upright walls.

2. The seat cushion airbag according to claim 1, wherein: The long side direction is along the width direction of the seat portion.

3. The seat cushion airbag according to claim 2, wherein: The top has raised portions at both ends in the long side direction. When deployed and expanded, the raised portion is located at a higher position than the central portion in the longitudinal direction.

4. The seat cushion airbag according to claim 1 or 2, wherein: The vertical wall is formed separately from the top and the bottom, and is formed in a lining shape integrated with the top and the bottom.

5. The seat cushion airbag according to claim 4, wherein: In a normal state before being deployed and expanded, the vertical wall is folded back.

6. The seat cushion airbag according to claim 1 or 2, wherein: The seat cushion airbag has a tether connecting the top portion and the bottom portion.

7. The seat cushion airbag according to claim 1 or 2, wherein: The seat cushion airbag has a tether connecting the upright walls to each other.

8. A seat cushion airbag device, comprising: a source of expansion fluid; and The seat cushion airbag is connected to the inflation fluid source and is expanded by supplying inflation fluid to the interior thereof, wherein: The seat cushion airbag is arranged in a seat portion of a vehicle seat below a seat surface and in a region between a center portion and a front end portion of the seat portion in a front-rear direction. When expanding, having a side portion between the top portion and the bottom portion, At least two opposing regions of the side portions have vertically extending upright walls.

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