JP6894359B2 - Vehicle seats with a built-in cushion airbag device and cushion airbags - Google Patents

Description

The present invention relates to a vehicle seat incorporating a cushion airbag device and a cushion airbag.

Vehicle seats incorporating a cushion airbag device are known (see Patent Documents 1 to 5). For example, Patent Document 1 below incorporates a cushion airbag device including a cushion panel constituting the bottom of a seat cushion, an inflator provided on the cushion panel, and a cushion airbag provided on the cushion panel. The technology related to vehicle seats is disclosed. Briefly, in this prior art, the cushion airbag has a lumbar restraint located in the center of the cushion panel and a gas inlet connecting the lumbar restraint to the inflator.

According to this prior art, when gas is ejected from the inflator during a frontal collision of a vehicle, the lumbar restraint of the cushion airbag expands, which effectively pushes the lumbar restraint of the seated occupant upward and restrains it. can do. That is, in the above-mentioned prior art, the so-called submarine phenomenon in which the lumbar region sinks into the seat cushion can be effectively suppressed.

Japanese Unexamined Patent Publication No. 2012-16970 Japanese Unexamined Patent Publication No. 2010-52535 International Publication No. 2013/094027 Pamphlet Japanese Unexamined Patent Publication No. 2013-163452 JP-A-2017-30446

By the way, the thicker the expansion thickness of the cushion airbag when it is inflated, the more the parts from the left and right hip joints of the seated occupant to the lower part of the ischium are pushed up, and the restraining force of the lumbar region at the time of a frontal collision increases, but the seated occupant moves upward. The amount also increases. On the other hand, since the head of the seated occupant tries to stay at that position by inertial force at the time of a frontal collision, it is possible that the load on the neck of the seated occupant increases as the amount of upward movement of the seated occupant increases.

In consideration of the above facts, the present invention considers the vehicle seat having a built-in cushion airbag device capable of reducing the load on the neck of the seated occupant while ensuring the restraining force of the lumbar region at the time of a frontal collision, and the cushion air. The purpose is to get a bag.

The vehicle seat incorporating the cushion airbag device of the present invention according to claim 1 is extended in the front-rear direction of the seat, and is provided and operated inside the cushion panel forming the bottom of the seat cushion and the seat cushion. The inflator that generates gas by doing so and the part that is provided on the cushion panel and expands by receiving the supply of gas generated by the inflator, and the part from the thigh to the hip point of the seated occupant in the expanded state. The cushion airbag is provided with a cushion airbag that pushes up the included range upward, and the cushion airbag has a push-up force in the rear left and right regions corresponding to the left and right hip joints of the seated occupant in the inflated completed state to the lower part of the sciatic bone. It is set to be smaller than the pushing force in the rear central region between the rear left and right regions in the above.

The "hip point" is the center of rotation between the torso and thigh of the seated occupant and corresponds to the hip joint of the human body. Further, the "lower part of the ischium" refers to the lower part of the ischium and the portion near the lower end of the ischium, which is grasped as facing directly below or substantially directly below the seated occupant in front view.

According to the above configuration, the inflator generates gas by operating, for example, when a frontal collision of a vehicle is detected or predicted. In addition, the cushion airbag expands by receiving the supply of gas generated by the inflator, and pushes up the range including the portion from the thigh to the hip point of the seated occupant in the expanded state. Here, in the cushion airbag, the pushing force in the posterior left and right regions corresponding to the left and right hip joints of the seated occupant in the expanded state to the lower part of the ischium is in the posterior central region between the posterior left and right regions in the expanded state. It is set to be smaller than the pushing force. Therefore, while the pushing force of the cushion airbag acts toward the concave portion between the lower ischial bones of the seated occupant, the range from the hip joint of the seated occupant to the lower ischial bone is not strongly pushed up. Therefore, the waist of the seated occupant is restrained while the amount of upward movement of the seated occupant is suppressed.

The vehicle seat incorporating the cushion airbag device of the present invention according to claim 2 has the configuration according to claim 1, wherein the cushion airbag has a front portion including a portion corresponding to a hip joint of a seated occupant. , A pair of left and right rear side portions set in the range from the hip joint corresponding portion, which is a portion corresponding to the hip joint of the seated occupant, to the portion corresponding to the lower end of the sciatic bone, which is a portion corresponding to the lower end of the seat bone of the seated occupant, and the rear pair of left and right The rear side portion has a rear intermediate portion arranged between the side portions, and when the cushion airbag is inflated while the occupant is seated, the rear side portion with respect to the upper surface of the intermediate portion in the seat width direction in the rear intermediate portion. The upper surface of the hip joint corresponding portion is set to be one step lower.

According to the above configuration, since the cushion airbag has a front portion including a portion corresponding to the thigh portion of the seated occupant, the thigh portion of the seated occupant can be lifted upward and restrained by the inflated front portion. it can. Further, the cushion airbag has a pair of left and right rear side portions and a rear intermediate portion arranged between them. The pair of left and right rear side portions are set in a range from the hip joint corresponding portion, which is a portion corresponding to the hip joint of the seated occupant, to the ischial lower end corresponding portion, which is a portion corresponding to the lower end of the ischial bone of the seated occupant. Here, when the cushion airbag is inflated while the occupant is seated, the upper surface of the hip joint-corresponding portion of the rear side portion is one step lower than the upper surface of the intermediate portion in the seat width direction in the rear intermediate portion. Therefore, while the seat width direction middle portion mainly in the rear middle portion of the cushion airbag is pressed toward the concave portion side between the lower ends of the ischium in the hip bone of the seated occupant, from the hip joint of the seated occupant to the lower end of the ischium. The range cannot be pushed up strongly. Therefore, the waist of the seated occupant is restrained while the amount of upward movement of the seated occupant is suppressed.

The vehicle seat incorporating the cushion airbag device of the present invention according to claim 3 has the configuration according to claim 2, wherein the expansion thickness of the rear side portion in the vertical direction of the seat when the cushion airbag is expanded is determined. It is set to be thinner than the expansion thickness of the rear intermediate portion in the vertical direction of the seat when the cushion airbag is expanded.

According to the above configuration, when the cushion airbag is inflated, the expansion thickness of the rear side portion in the vertical direction of the seat is set to be thinner than the expansion thickness of the rear middle portion in the vertical direction of the seat. For this reason, when the cushion airbag is inflated while the occupant is seated, it is relatively easy to set the upper surface of the hip joint corresponding portion of the rear side portion to be one step lower than the upper surface of the intermediate portion in the seat width direction in the rear intermediate portion. be able to.

The vehicle seat incorporating the cushion airbag device of the present invention according to claim 4 has the configuration according to claim 3, in which the left and right side portions at the rear portion of the cushion airbag have seats on both the left and right side portions. A sewn portion or a tether is provided that connects the portions that overlap each other in the vertical direction and regulates the expansion thickness of the rear side portion in the vertical direction of the seat when the cushion airbag is inflated.

According to the above configuration, the sewn portions or tethers provided on the left and right side portions of the rear portion of the cushion airbag connect the portions of the left and right side portions that overlap each other in the vertical direction of the seat to expand the cushion airbag. It regulates the expansion thickness of the rear side portion in the vertical direction of the seat. Therefore, even if the peripheral structure such as the cushion panel is not devised, when the cushion airbag is inflated while the occupant is seated, the hip joint-corresponding portion of the rear side portion with respect to the upper surface of the intermediate portion in the seat width direction in the rear intermediate portion. The setting for lowering the upper surface by one step can be realized with a simple configuration.

The vehicle seat incorporating the cushion airbag device of the present invention according to claim 5 has the configuration according to any one of claims 2 to 4, wherein the cushion panel corresponds to the rear intermediate portion. It has a panel rear middle portion, which is a portion to be formed, and a panel rear side portion arranged outside in the seat width direction with respect to the panel rear intermediate portion, and the panel rear side portion is at least a seat of the panel rear intermediate portion. It is located below the seat from the middle part in the width direction.

According to the above configuration, the rear side portion of the cushion airbag is the height of a surface in which the seat width direction intermediate portion in the rear middle portion of the cushion airbag is supported by the seat width direction intermediate portion in the panel rear intermediate portion of the cushion panel. Expansion to the lower side of the seat than the position is allowed. Therefore, when the cushion airbag is inflated, the height position of the upper surface of the rear side portion of the cushion airbag is easily lowered with respect to the height position of the upper surface of the middle portion in the seat width direction in the rear intermediate portion of the cushion airbag. can do.

The vehicle seat incorporating the cushion airbag device of the present invention according to claim 6 has the configuration according to any one of claims 2 to 4, wherein the cushion panel corresponds to the rear intermediate portion. It has a panel rear middle portion, which is a portion to be used, and a panel rear side portion arranged outside in the seat width direction with respect to the panel rear intermediate portion, and the panel rear side portion is the cushion airbag in a seated state of an occupant. When the bag is inflated, it is set so as to be lowered to the lower side of the seat from at least the middle portion in the seat width direction of the rear middle portion of the panel by receiving the expansion pressure of the cushion airbag.

According to the above configuration, the rear side portion of the cushion panel receives at least the seat width of the rear intermediate portion of the cushion panel by receiving the expansion pressure of the cushion airbag when the cushion airbag is inflated while the occupant is seated. It goes down to the lower side of the seat from the middle part of the direction. Therefore, when the cushion airbag is inflated, the height position of the upper surface of the rear side portion of the cushion airbag is easily lowered with respect to the height position of the upper surface of the middle portion in the seat width direction in the rear intermediate portion of the cushion airbag. can do.

The vehicle seat incorporating the cushion airbag device of the present invention according to claim 7 has the configuration according to any one of claims 1 to 6, wherein the inflator is inside the cushion airbag. The cushion airbag is arranged at a portion on the front side of the seat, and the cushion airbag is formed by sewing a base cloth folded back at a central portion so as to be overlapped in the vertical direction, and the folded portion of the base cloth is the cushion air. The end portion on the rear side of the seat of the bag is formed and arranged along the seat width direction, and the suture portions of the cushion airbag are provided on both sides in the seat width direction and are provided with a pair of side suture portions extending in the front-rear direction of the seat. It has a pair of rear side stitched portions extending from each rear end of the pair of side side stitched portions to the intermediate portion in the seat width direction of the folded portion toward the inside diagonally rearward side in the seat width direction and the rear ends being separated from each other.

According to the above configuration, in the sewn portion of the cushion airbag, the pair of rear sewn portions is oblique inward in the sheet width direction from each rear end of the pair of side sewn portions to the intermediate portion of the folded portion of the base fabric in the sheet width direction. It extends to the rear side and the rear ends are separated from each other. Therefore, the length of the sutured portion, which causes gas leakage, can be suppressed. Therefore, as compared with a structure in which the upper and lower base fabrics are connected by sewing instead of the folded portion, for example, it is possible to suppress a decrease in internal pressure of the inflated cushion airbag over time.

Further, the inflator is arranged at a portion on the front side of the seat inside the cushion airbag, and the gas generated by the inflator is supplied to the rear side of the seat inside the cushion airbag. Here, the folded-back portion of the base cloth constitutes the end portion on the rear side of the seat of the cushion airbag and is arranged along the seat width direction. Therefore, gas leakage from the rear end of the cushion airbag seat is effectively suppressed at the initial stage of expansion of the cushion airbag.

The cushion airbag of the present invention according to claim 8 is a cushion airbag in which an inflator is housed on the front side of the seat in a state of being mounted on the vehicle seat, and the cushion airbag of the vehicle seat in the expanded state thereof. The push-up force in the rear left-right region corresponding to each of the left and right hip joints of the seated occupant to the lower part of the seat bone is set to be smaller than the push-up force in the rear central region between the rear left-right regions in the expanded state. In the cushion airbag, the cushion airbag is formed by sewing a base cloth folded back at a central portion so as to be overlapped in the vertical direction, and the side of the folded portion of the base cloth inside the base cloth. A portion where the inflator is arranged is provided on a portion opposite to the above, and the sewn portions of the cushion airbag are provided on both sides of the first direction along the extending direction of the folded portion and are provided on both sides of the first direction. A pair of side cushions extending along a second orthogonal direction and each end of the pair of side cushions on the side of the folded portion approach each other to an intermediate portion of the folded portion in the first direction. It has a pair of posterior sewn portions that extend diagonally so that the ends located at the folded portion are separated from each other.

According to the above configuration, by mounting on a vehicle seat, it is possible to obtain the same operation as that of the invention according to claim 1 and 7. Further, by reducing the length of the sewn portion, it is possible to reduce the manufacturing cost of the cushion airbag.

As described above, according to the vehicle seat incorporating the cushion airbag device according to claim 1 of the present invention, the load on the neck of the seated occupant is applied while ensuring the restraining force of the lumbar region at the time of a frontal collision. It has an excellent effect that it can be reduced.

According to the vehicle seat incorporating the cushion airbag device according to claim 2, the upper surface of the cushion airbag is stepped at the time of expansion, so that the restraining force of the lumbar region at the time of a frontal collision is satisfactorily secured. It has an excellent effect that the load on the neck of the seated occupant can be reduced.

According to the vehicle seat incorporating the cushion airbag device according to claim 3, it is possible to easily set the upper surface position of the cushion airbag when the cushion airbag is inflated while the occupant is seated. Has an excellent effect.

According to the vehicle seat incorporating the cushion airbag device according to claim 4, the cushion airbag when the cushion airbag is inflated while the occupant is seated without devising the peripheral structure of the cushion airbag. It has an excellent effect that the setting of the upper surface position of the above can be facilitated.

According to the vehicle seat incorporating the cushion airbag device according to claim 5, the shape of the cushion panel is formed so as to allow the rear side portion of the cushion airbag to expand downward to the lower side of the seat. It has an excellent effect that the upper surface position of the cushion airbag inflated while the occupant is seated can be easily set.

According to the vehicle seat incorporating the cushion airbag device according to claim 6, when the cushion airbag is inflated while the occupant is seated, the rear side portion of the cushion airbag is allowed to expand downward to the lower side of the seat. By deforming the cushion panel, it has an excellent effect that the upper surface position of the cushion airbag inflated while the occupant is seated can be easily set.

According to the vehicle seat incorporating the cushion airbag device according to claim 7, gas leakage from the rear end of the cushion airbag during and after expansion of the cushion airbag can be effectively suppressed. It has an excellent effect of being able to do it.

The cushion airbag according to claim 8 has an excellent effect that the same effects as those of the inventions according to claims 1 and 7 can be obtained by mounting the cushion airbag on a vehicle seat.

It is a top view which shows the main part of the vehicle seat which built in the cushion airbag device which concerns on 1st Embodiment of this invention. It is a vertical cross-sectional view which shows the state which cut along the line 2-2 of FIG. 1 in a simplified manner. It is a vertical cross-sectional view which shows the inflated state of the cushion airbag of FIG. 1 at the same cutting position as FIG. FIG. 5 is a vertical cross-sectional view showing a simplified state in which the cushion airbag of FIG. 1 is inflated along the line 4-4 of FIG. The cushion airbag indicated by the alternate long and short dash line is shown in a state of being cut along the 4L-4L line in FIG. It is a vertical cross-sectional view corresponding to FIG. 2 which shows the main part of the vehicle seat which built in the cushion airbag device which concerns on 2nd Embodiment of this invention in the front view. FIG. 5 is a vertical cross-sectional view showing a state in which the cushion airbag of FIG. 5 is inflated at the same cutting position as that of FIG. It is a top view corresponding to FIG. 1 which shows the main part of the vehicle seat which built in the cushion airbag device which concerns on 3rd Embodiment of this invention. It is a vertical cross-sectional view which shows the state cut along the line 8-8 of FIG. 7 in a simplified manner. FIG. 5 is a vertical cross-sectional view showing a state in which the cushion airbag of FIG. 7 is inflated at the same cutting position as in FIG. It is a top view for demonstrating the cushion airbag which can be applied instead of the cushion airbag of 1st Embodiment. FIG. 10A shows a state before the base fabric is folded back at the central portion. FIG. 10B shows a state in which the base fabric folded back at the center is sewn together. It is an exploded plan view which shows the base cloth shown in FIG. 10A in the disassembled state.

[First Embodiment]
Hereinafter, a vehicle seat 10 (hereinafter, abbreviated as a vehicle seat 10) incorporating a cushion airbag device according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 4. In these figures, the arrow FR appropriately shown indicates the front side of the vehicle, the arrow UP indicates the upper side of the vehicle, and the arrow W indicates the width direction of the vehicle. Hereinafter, when the explanation is simply made using the front-rear, left-right, and up-down directions, unless otherwise specified, the front-rear direction of the vehicle front-rear direction, the left-right direction of the vehicle left-right direction (vehicle width direction), and the up-down direction of the vehicle up-down direction are shown. To do.

As shown in FIG. 1, the vehicle seat 10 according to the present embodiment is used as a front seat in a vehicle such as a passenger car, for example. Further, in the present embodiment, in the vehicle seat 10, the front-rear direction of the seat coincides with the front-rear direction of the vehicle, and the seat width direction coincides with the vehicle width direction. The vehicle seat 10 is for supporting the seat cushion 14 for supporting the waist L (including the buttocks here) and the thigh D of the seated occupant P, and the back B (see FIG. 4) of the seated occupant P. It is equipped with a seat back 12.

In addition, in FIGS. 1 to 3, a part of the skeleton including the hip bone PW of the seated occupant P is shown in a simplified state in which the seated occupant P is seen through. Further, the seated occupant P shown in FIGS. 1 to 4 is the same as a state in which, for example, an AM50 (50th percentile of an American adult male) dummy doll is seated in the standard sitting posture defined by the collision test method. The seated occupant is in a state. Further, the vehicle seat 10 is located at a reference setting position corresponding to the sitting posture.

As shown in FIG. 2, the seat cushion 14 includes a cushion pad (also referred to as a “seat foam pad”) 16 and a cushion panel 18 arranged below the seat of the cushion pad 16 and supporting the cushion pad 16. , Is included. The surface of the cushion pad 16 is covered with a skin (not shown). Further, the cushion panel 18 is a seat skeleton member constituting the bottom portion of the seat cushion 14, and extends in the front-rear direction of the seat and the width direction of the seat. The seat cushion 14 shown in FIG. 1 has a built-in cushion airbag device 20. The cushion airbag device 20 includes an inflator 22 and a cushion airbag 30.

The inflator 22 is provided near the front portion of the middle portion in the front-rear direction of the seat inside the seat cushion 14, and is arranged with the seat width direction as the longitudinal direction. The inflator 22 is, for example, a cylinder-shaped gas generator configured to eject gas and supply it into the cushion airbag 30 at the time of a frontal collision or a frontal collision prediction of a vehicle. The inflator 22 is connected to the airbag ECU 24 via a wire harness (not shown), and is configured to generate gas by operating with an operating current from the airbag ECU 24. The airbag ECU 24 is configured to flow an operating current to the inflator 22 when a frontal collision of the vehicle is determined by a signal from a collision sensor (not shown) or when a frontal collision is predicted.

As shown in FIG. 2, the cushion airbag 30 is provided on the cushion panel 18 and is arranged on the lower side of the cushion pad 16. The cushion airbag 30 is formed in a bag shape by sewing one or a plurality of panels formed by cutting out, for example, a nylon-based or polyester-based base cloth. The above-mentioned inflator 22 shown in FIG. 4 is housed inside the cushion airbag 30. A stud bolt (not shown) is erected on the peripheral wall portion of the inflator 22, and the stud bolt penetrates the cushion airbag 30 and the cushion panel 18. Then, a nut (not shown) is screwed from the outside of the cushion panel 18 to the through end of the stud bolt, so that the cushion airbag 30 is fixed to the cushion panel 18 together with the inflator 22.

The sewn portion on the peripheral edge side of the cushion airbag 30 is not shown in FIG. 1, and is designated by reference numeral S in FIG. Further, in FIGS. 2 to 4, the cross section of the cushion airbag 30 is shown by a thick line without adding a wall thickness for convenience. Further, in FIG. 2, in order to make the figure easier to see, it is shown in a state where a slight gap is opened between the left and right intermediate portions of the upper and lower cloth portions of the cushion airbag 30 (second embodiment described later). The same applies to FIG. 5 showing the above and FIG. 8 showing the third embodiment).

The cushion airbag 30 is configured to inflate as shown in FIGS. 3 and 4 in response to the supply of gas generated by the inflator 22 (see FIG. 1). As shown in FIG. 4, the cushion airbag 30 pushes up the range including the portion from the thigh D to the hip point HP (design hip point) of the seated occupant P in the expanded state. There is. The rear end of the cushion airbag 30 in the expanded state is set to the rear side of the seat with respect to the hip point HP of the seated occupant P. In FIG. 4, the cushion airbag 30 shown by the solid line shows a state of being cut along the line 4-4 of FIG. 1, and the cushion airbag 30 shown by the alternate long and short dash line is the line 4L-4L of FIG. It shows the state of being cut along.

As shown in FIG. 1, the cushion airbag 30 has a front portion 32 including a portion corresponding to the thigh portion D of the seated occupant P, and on the rear side, a pair of left and right rear side portions 34 and left and right. It has a rear intermediate portion 36, which is arranged between the pair of rear side portions 34. As shown in FIG. 2, the pair of left and right rear side portions 34 correspond to the lower end of the ischium, which is the portion corresponding to the lower end P3 of the ischium of the seated occupant P, from the hip joint corresponding portion 34A, which is the portion corresponding to the hip joint P2 of the seated occupant P. It is set in the range up to the part 34B. In FIG. 1, the range (approximately range) from the hip joint P2 of the seated occupant P to the lower end of the ischial bone P3 (see FIG. 2) of the seated occupant P is surrounded by the alternate long and short dash line PX in the vehicle plan view.

As shown in FIG. 1, the left and right side portions 30S at the rear portion of the cushion airbag 30 are connected to the portions of the left and right side portions 30S that overlap each other in the vertical direction of the seat, and the cushion airbag 30 is inflated. A sewing portion 38 (indicated by a simplified sewing line in the drawing) is provided to regulate the expansion thickness of the rear side portion 34 in the vertical direction of the seat. As a result, as shown in FIG. 3, the expansion thickness of the rear side portion 34 in the vertical direction of the seat when the cushion airbag 30 is inflated is the expansion of the rear intermediate portion 36 in the vertical direction of the seat when the cushion airbag 30 is inflated. It is set to be thinner than the thickness. Then, in the cushion airbag 30, the pushing force in the rear left and right regions A1 and A3 corresponding to the left and right hip joints P2 of the seated occupant P in the expanded state to the lower ischial PS is the posterior left and right regions A1 and A3 in the expanded state. It is set to be smaller than the pushing force in the rear central region A2 between the two. Further, when the cushion airbag 30 is inflated while the occupant is seated, the upper surface 34U of the hip joint corresponding portion 34A of the rear side portion 34 is one step lower than the upper surface 36U of the intermediate portion in the seat width direction of the rear intermediate portion 36. It is set to be.

(Action / effect)
Next, the operation and effect of the above embodiment will be described.

The inflator 22 shown in FIG. 1 operates to generate gas when a frontal collision of the vehicle is detected or predicted, and the cushion airbag 30 expands by being supplied with the gas generated by the inflator 22. .. Since the cushion airbag 30 has a front portion 32 including a portion corresponding to the thigh portion D of the seated occupant P, the inflated front portion 32 lifts and restrains the thigh portion D of the seated occupant P upward. Can be done.

Here, in the cushion airbag 30 shown in FIG. 3, the pushing force in the posterior left and right regions A1 and A3 corresponding to the left and right hip joints P2 of the seated occupant P in the expanded state from the left and right hip joints P2 to the lower ischial PS is in the expanded state. It is set to be smaller than the pushing force in the rear central region A2 between the rear left and right regions A1 and A3. Therefore, while the pushing force of the cushion airbag 30 acts toward the concave portion between the lower ischial PSs of the seated occupant P, the range from the hip joint P2 of the seated occupant P to the lower ischial PS is not strongly pushed up. .. Therefore, the waist portion L of the seated occupant P is restrained while the amount of upward movement of the seated occupant P is suppressed.

Further, as shown in FIG. 4, the rear end of the cushion airbag 30 in the expanded state is set to be rearward of the seat of the seated occupant P's hip point HP, and as shown in FIG. It has a pair of left and right rear side portions 34 set in the range from the hip joint corresponding portion 34A to the ischial lower end corresponding portion 34B, and the posterior intermediate portion 36 arranged between them. Here, as shown in FIG. 3, when the cushion airbag 30 is inflated while the occupant is seated, the cushion airbag 30 is the hip joint of the rear side portion 34 with respect to the upper surface 36U of the intermediate portion in the seat width direction in the rear intermediate portion 36. The upper surface 34U of the corresponding portion 34A is set to be one step lower. Therefore, while the seat width direction intermediate portion of the cushion airbag 30 is mainly pressed toward the concave portion between the lower end portions P3 of the ischium in the hip bone PW of the seated occupant P, the seated occupant P is pressed. The range from the hip joint P2 to the lower end of the ischium P3 cannot be pushed up strongly. Therefore, the waist portion L of the seated occupant P is restrained while the amount of upward movement of the seated occupant P is suppressed.

As described above, according to the vehicle seat 10 according to the present embodiment, it is possible to reduce the load on the neck of the seated occupant P while ensuring the restraining force of the lumbar portion L at the time of a frontal collision.

Further, in the present embodiment, when the cushion airbag 30 is expanded, the expansion thickness of the rear side portion 34 in the vertical direction of the seat is set to be thinner than the expansion thickness of the rear intermediate portion 36 in the vertical direction of the seat. Therefore, when the cushion airbag 30 is inflated while the occupant is seated, the upper surface 34U of the hip joint corresponding portion 34A of the rear side portion 34 is set to be one step lower than the upper surface 36U of the intermediate portion in the seat width direction in the rear intermediate portion 36. Can be made relatively easy.

Further, in the present embodiment, the sewn portions 38 provided on the left and right side portions 30S at the rear portion of the cushion airbag 30 shown in FIG. 1 form portions of the left and right side portions 30S that overlap each other in the vertical direction of the seat. In connection with each other, the expansion thickness of the rear side portion 34 in the vertical direction of the seat when the cushion airbag 30 is expanded is regulated. Therefore, even if the peripheral structure of the cushion panel 18 or the like is not devised, when the cushion airbag 30 is inflated in the occupant seated state shown in FIG. A setting for lowering the upper surface 34U of the hip joint corresponding portion 34A of the rear side portion 34 can be realized with a simple configuration.

As a modification of the first embodiment, instead of the sewn portion 38 shown in FIG. 1 of the above embodiment, the left and right side portions 30S in the rear portion of the cushion airbag 30 are replaced with the left and right side portions 30S. A tether (not shown, a partition cloth that partitions the inside of the cushion airbag) that connects the parts that overlap each other in the vertical direction of the seat and regulates the expansion thickness of the rear side portion 34 in the vertical direction of the seat when the cushion airbag 30 is inflated. It may be provided. Even with such a configuration, substantially the same actions and effects as those of the first embodiment described above can be obtained.

Next, the cushion airbag 60 applicable in place of the cushion airbag 30 of the first embodiment will be described with reference to FIGS. 10 and 11.

As shown in the exploded plan view of FIG. 11, the base cloth 62 of the cushion airbag 60 (see FIG. 10B) includes a base cloth main body 64, a reinforcing base cloth 66A, 66B, 68A, 68B, 68F and a rectifying group. It is composed of cloth 70. The base cloth main body 64 includes a substantially rectangular main body main portion 64A and a flap portion 64F protruding from one side in the longitudinal direction of the main body main portion 64A. A plurality of (three in this embodiment) inflators are attached to the portion of the main body main body 64A opposite to the side of the flap portion 64F and to the flap portion 64F in the lateral direction of the base cloth main body 64, respectively. Mounting holes 64a and 64f for the purpose are formed through.

Further, among the reinforcing base cloths 68A, 68B, and 68F provided corresponding to the arrangement portion of the inflator 22 (see FIG. 10), the reinforcing base cloths 68A and 68F are also provided with a plurality (three in the present embodiment), respectively. The provided mounting holes 68a and 68f for mounting the inflator are formed through. Further, the reinforcing base cloths 66A and 66B used for reinforcing both sides of the base cloth main body 64 in the lateral direction have a long strip shape. Further, the rectifying base cloth 70 has a substantially square shape and is folded back along a fold line 70X set in the central portion so as to be overlapped in the vertical direction. An inflator 22 (see FIG. 10) is arranged between the bent rectifying base cloths 70. Further, in the rectifying base cloth 70, rectifying holes 70a are formed through the rectifying base cloth 70 on both sides in the direction along the folding line 70X in the vicinity of the folding line 70X. The rectifying hole 70a is a hole for supplying the gas of the inflator 22 (see FIG. 10) after rectifying it. Further, the rectifying base cloth 70 is formed with a mounting hole 70b for mounting an inflator on the side opposite to the side of the folding line 70X with respect to the rectifying hole 70a. A plurality of mounting holes 70b (three in the present embodiment) are arranged side by side in the direction along the folding line 70X.

As shown in FIG. 10A, reinforcing base cloths 66A and 66B are sewn along the sewing lines S1 and S2 on both sides of the base cloth main body 64 in the lateral direction. The reinforcing base cloths 66A and 66B are arranged so that their longitudinal directions are along the longitudinal direction of the base cloth main body 64. The reinforcing base cloths 68A and 68B are arranged on both sides of the main body main portion 64A in the longitudinal direction, and the reinforcing base cloth 68F is arranged so as to be overlapped with the flap portion 64F (see FIG. 11). The reinforcing base cloths 68A and 68F are arranged on the base cloth main body 64 so that the mounting holes 68a and 68f and the mounting holes 64a and 64f shown in FIG. 11 of the base cloth main body 64 coincide with each other. The reinforcing base cloths 68A, 68B, and 68F shown in FIG. 10A are sewn to the base cloth main body 64 along the sewing lines S3, S4, and S5.

Further, in the main body 64A of the base cloth main body 64, the rectifying base cloth 70 is sewn along the sewing line S6 on the flap portion 64F (see FIG. 11) side (right side in the drawing). The rectifying base cloth 70 is arranged so as to sandwich the reinforcing base cloth 66B with the base cloth main body 64, and its longitudinal direction is along the lateral direction of the base cloth main body 64. Further, the rectifying base cloth 70 is arranged so that the rectifying hole 70a is on the opposite side (left side in the drawing) to the side of the flap portion 64F (see FIG. 11).

As shown in FIG. 10B, the cushion airbag 60 is made by suturing a base cloth 62 folded back at a central portion so that the rectifying base cloth 70 and the like are overlapped in the vertical direction so as to be on the inside. It is formed. The alternate long and short dash line 62L in FIG. 10A indicates the planned folding position of the base cloth 62. As shown in FIG. 10B, the cushion airbag 60 is configured to be provided with a portion 60X in which the inflator 22 is arranged at a portion opposite to the side of the folded-back portion 62X. In the state where the cushion airbag 60 is mounted on the vehicle seat 10 (see FIG. 1) (hereinafter, abbreviated as “seat mounted state”), the portion 60X where the inflator 22 is arranged is inside the cushion airbag 60. It is the part on the front side of the seat. Further, in the cushion airbag 60, when the seat is mounted, the folded portion 62X of the base cloth 62 forms an end portion on the rear side of the seat and is arranged along the seat width direction.

Further, the sewn portions 60S of the cushion airbag 60 are provided on both sides of the first direction X along the extending direction of the folded-back portion 62X (both sides in the seat width direction when the seat is mounted) and are orthogonal to the first direction X. It is provided with a pair of side stitching portions 60B extending along two directions Y (the front-rear direction of the seat when the seat is mounted). Further, the sewn portion 60S of the cushion airbag 60 includes a pair of front sewn portions 60A continuously extending to one end side (right side in the drawing) of the pair of side sewn portions 60B, and the pair of side sewn portions 60B. A pair of posterior suture portions 60C extending continuously on the other end side (left side in the drawing) is provided.

The pair of front sewn portions 60A are obliquely approached from each end (each front end in the seat mounted state) on the side opposite to the side of the folded portion 62X in the pair of side sewn portions 60B (seat mounted state). Extends diagonally forward on the inside in the width direction of the seat. In the pair of front suture portions 60A, the ends (front ends) 60A1 located at the terminal 62Z on the anti-folding portion side of the base cloth 62 are separated from each other and are arranged at positions adjacent to the reinforcing base cloth 68F. Has been done.

The pair of rear side stitched portions 60C is formed from each end portion (each rear end in the seat mounted state) on the folded-back portion 62X side of the pair of side-side stitched portions 60B to the intermediate portion (seat) of the first direction X in the folded-back portion 62X. It extends diagonally (inward and diagonally rearward in the seat width direction) so as to approach each other toward the middle portion in the seat width direction in the mounted state). The rear suture portion 60C is configured to have a convex arc shape toward the outside of the base cloth 62 in a plan view (the lateral diagonally rear side in the seat width direction in the seat-mounted state). The ends (rear ends) 60C1 located at the folded-back portions 62X in the pair of rear suture portions 60C are separated from each other. The rear suture portion 60C described above is a component portion having the same function as the sewn portion 38 (see FIG. 1) in the first embodiment.

Further, the flap portion 64F (see FIG. 11) to which the reinforcing base cloth 68F is sewn is provided so that the position of the mounting hole 68f is aligned with the position of the mounting hole 64a of the base cloth main body 64 shown in FIG. , Wrapped (not shown). Then, stud bolts (not shown) erected on the peripheral wall portion of the inflator 22 are attached to the mounting holes 70b and 68a shown in FIG. 10A, the mounting holes 64a and 68f shown in FIG. 10B, and the cushion panel. It penetrates 18 (see FIGS. 1 to 4) and is screwed with a nut (not shown). As described above, the cushion airbag 60 is fixed to the cushion panel 18 (see FIGS. 1 to 4) with the inflator 22 housed therein. Similar to the cushion airbag 30 of the first embodiment (see FIGS. 1 to 4), the cushion airbag 60 is on the left and right sides of the seated occupant P of the vehicle seat 10 shown in FIG. 3 in the expanded state. The pushing force in the posterior left and right regions A1 and A3 corresponding to the hip joint P2 to the lower seat bone PS is smaller than the pushing force in the posterior central region A2 between the posterior left and right regions A1 and A3 in the expanded state. It is set.

When the cushion airbag 60 shown in FIG. 10B described above is arranged in place of the cushion airbag 30 of the first embodiment (see FIGS. 1 to 4), it is the same as that of the first embodiment. In addition to obtaining actions and effects, the length of the sutured portion, which causes gas leakage, is suppressed. Therefore, it is possible to suppress a decrease in internal pressure of the inflated cushion airbag 60 over time. By suppressing the length of the sewn portion, it is possible to reduce the manufacturing cost of the cushion airbag 60. Further, since the folded-back portion 62X of the base cloth 62 constitutes the end portion on the rear side of the seat of the cushion airbag 60 and is arranged along the seat width direction, the cushion airbag 60 is arranged at the initial stage of expansion of the cushion airbag 60. Gas leakage from the rear end of the seat is effectively suppressed.

[Second Embodiment]
Next, the vehicle seat 40 incorporating the cushion airbag device 44 according to the second embodiment of the present invention will be described with reference to FIGS. 5 and 6. As shown in these figures, the present embodiment includes a cushion panel 42 instead of the cushion panel 18 (see FIGS. 1 to 4) and does not include a curved sewn portion 38 (see FIG. 1). Therefore, it is different from the first embodiment. The other configurations are substantially the same as those of the first embodiment.

The cushion airbag 30 does not include the sewn portion 38 (see FIG. 1), but the other configuration is the same as that of the cushion airbag 30 in the first embodiment. Therefore, for convenience, the first embodiment is performed. The same code as the form is attached. Further, other components substantially the same as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

Similar to the cushion panel 18 (see FIG. 1) in the first embodiment, the cushion panel 42 shown in FIG. 5 extends in the front-rear direction of the seat and serves as a seat skeleton member forming the bottom of the seat cushion 14. There is. The cushion panel 42 has a panel rear intermediate portion 42A which is a portion corresponding to the rear intermediate portion 36 of the cushion airbag 30, and a panel rear side portion 42B arranged outside the panel rear intermediate portion 42A in the seat width direction. Has. The panel rear side portion 42B is located below the seat at least the seat width direction intermediate portion of the panel rear intermediate portion 42A. Supplementally, the panel rear side portion 42B has an inclined portion 42B1 inclined downward in the seat width direction from the outer end portion of the panel rear intermediate portion 42A in the seat width direction and an inclined portion 42B1 outside in the seat width direction. It is provided with a side lower wall portion 42B2 extending outward from the end portion in the seat width direction. As a result, as shown in FIG. 6, when the cushion airbag 30 is inflated while the occupant is seated, the cushion airbag 30 has a hip joint of the rear side portion 34 with respect to the upper surface 36U of the intermediate portion in the seat width direction in the rear intermediate portion 36. The upper surface 34U of the corresponding portion 34A is set to be one step lower. Then, when the cushion airbag 30 of the present embodiment is expanded, the pushing force of each of the rear left and right regions A1, A3 and the rear central region A2 is set by expanding the cushion airbag 30 of the first embodiment (see FIG. 3). It is the same as the setting of the pushing force of each of the rear left and right regions A1 and A3 and the rear central region A2 at the time.

Although not shown, the arrangement area of the cushion panel 42 in the vehicle plan view is set substantially the same as the arrangement area of the cushion panel 18 (see FIG. 1) in the vehicle plan view in the first embodiment. Has been done. In the cushion panel 42, the rear side portion 42B of the panel is located on the lower side of the seat with respect to other portions.

According to the configuration of the present embodiment, the setting of the pushing force of each of the rear left and right regions A1, A3 and the rear central region A2 when the cushion airbag 30 is expanded is the same as that of the first embodiment. With respect to pushing up at the time of expansion by, the same action and effect as in the first embodiment can be obtained.

Further, in the configuration of the present embodiment, in the rear side portion 34 of the cushion airbag 30, the intermediate portion in the seat width direction of the rear intermediate portion 36 of the cushion airbag 30 is the intermediate portion in the seat width direction of the panel rear intermediate portion 42A of the cushion panel 42. Expansion to the lower side of the seat than the height position of the surface supported by the portion is allowed. Then, when a frontal collision of the vehicle is detected or predicted while the occupant is seated and the inflator 22 (see FIG. 1) is activated, the cushion airbag 30 is intermediate in the rear intermediate portion 36 in the seat width direction, as shown in FIG. The upper surface 34U of the hip joint corresponding portion 34A of the rear side portion 34 expands so as to be one step lower than the upper surface 36U of the portion. Therefore, similarly to the first embodiment, the seat width direction intermediate portion mainly in the rear intermediate portion 36 of the cushion airbag 30 is pushed toward the side of the concave portion between the ischial lower end P3s in the ischial bone PW of the seated occupant P. On the other hand, the range from the hip joint P2 of the seated occupant P to the lower end P3 of the ischium is not strongly pushed up. Therefore, the same effect as that of the first embodiment can be obtained.

Further, in the present embodiment, the shape of the cushion panel 42 is formed so as to allow the rear side portion 34 of the cushion airbag 30 to expand downward to the seat downward side, so that the cushion air is formed when the cushion airbag 30 is expanded. The height of the upper surface of the rear side portion 34 of the cushion airbag 30 (the upper surface including the upper surface 34U of the hip joint corresponding portion 34A) with respect to the height position of the upper surface 36U of the intermediate portion in the seat width direction in the rear intermediate portion 36 of the bag 30. The position can be easily lowered.

[Third Embodiment]
Next, the vehicle seat 50 incorporating the cushion airbag device 54 according to the third embodiment of the present invention will be described with reference to FIGS. 7 to 9. As shown in these figures, the present embodiment includes a cushion panel 52 instead of the cushion panel 18 (see FIGS. 1 to 4) and does not include a curved sewn portion 38 (see FIG. 1). Therefore, it is different from the first embodiment. The other configurations are substantially the same as those of the first embodiment.

The cushion airbag 30 does not include the sewn portion 38 (see FIG. 1), but the other configuration is the same as that of the cushion airbag 30 in the first embodiment. Therefore, for convenience, the first embodiment is performed. The same code as the form is attached. Further, other components substantially the same as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. Further, in FIG. 7, the inflator 22 (see FIG. 1) and the airbag ECU 24 (see FIG. 1) are not shown in order to make the figure easier to see.

As shown in FIG. 7, the cushion panel 52 extends in the front-rear direction of the seat and constitutes the bottom of the seat cushion 14, similarly to the cushion panel 18 (see FIG. 1) in the first embodiment. It is said that. The cushion panel 52 is formed with reinforcing beads 54A, 54B, 54C extending in the seat width direction and recessed on the lower side of the seat. The left and right ends of the plurality of beads 54A formed on the front portion of the cushion panel 52 are set at positions substantially corresponding to the outer side surfaces of the thigh portion D of the seated occupant P. Further, the beads 54B and 54C formed on the rear portion of the cushion panel 52 are set at positions in the seat width direction inside the thigh bone P1 of the seated occupant P in the seat width direction.

As shown in FIG. 8, the cushion panel 52 has a panel rear intermediate portion 52A which is a portion corresponding to the rear intermediate portion 36 of the cushion airbag 30, and is outward in the seat width direction with respect to the panel rear intermediate portion 52A. It has a panel rear side portion 52B to be arranged. Of the beads 54B and 54C formed at the rear portion of the cushion panel 52 shown in FIG. 7, the plurality of beads 54C formed at the rear intermediate portion 52A of the panel have both left and right ends straddling the rear side portion 52B of the panel. Absent. In other words, the panel rear side portion 52B is not formed with a reinforcing bead, and the panel rear side portion 52B is set to have a lower rigidity in the seat vertical direction than the panel rear intermediate portion 52A.

As a result, as shown in FIG. 9, the panel rear side portion 52B receives at least the seat of the panel rear intermediate portion 52A by receiving the expansion pressure of the cushion airbag 30 when the cushion airbag 30 is inflated while the occupant is seated. It is set so that it goes down below the seat from the middle part in the width direction. Supplementally, since the cushion airbag 30 is in a state of being pushed from the cushion pad 16 side by the weight of the seated occupant P or the like, when the cushion airbag 30 expands, the cushion airbag 30 is on the cushion pad 16 side. A reaction force is obtained from the seat to apply a load to the lower side of the seat, and a part of the load lowers the rear side portion 52B of the panel to the lower side of the seat. When the cushion airbag 30 is inflated while the occupant is seated, the upper surface 34U of the hip joint corresponding portion 34A of the rear side portion 34 is one step lower than the upper surface 36U of the intermediate portion in the seat width direction of the rear intermediate portion 36. It is set to be. Then, when the cushion airbag 30 of the present embodiment is expanded, the pushing force of each of the rear left and right regions A1, A3 and the rear central region A2 is set by expanding the cushion airbag 30 of the first embodiment (see FIG. 3). It is the same as the setting of the pushing force of each of the rear left and right regions A1 and A3 and the rear central region A2 at the time.

According to the above configuration, the setting of the pushing force of each of the rear left and right regions A1, A3 and the rear central region A2 when the cushion airbag 30 is expanded is the same as that of the first embodiment, and therefore, when the cushion airbag 30 is expanded. With respect to pushing up, the same action and effect as in the first embodiment can be obtained.

Further, in the configuration of the present embodiment, when the frontal collision of the vehicle is detected or predicted while the occupant is seated and the inflator 22 (see FIG. 1) is activated, the panel rear side portion 52B of the cushion panel 52 expands the cushion airbag 30. By receiving the pressure, the cushion panel 52 is lowered to the lower side of the seat from at least the middle portion in the seat width direction of the panel rear intermediate portion 52A. As a result, the cushion airbag 30 expands so that the upper surface 34U of the hip joint corresponding portion 34A of the rear side portion 34 is one step lower than the upper surface 36U of the intermediate portion in the seat width direction in the rear intermediate portion 36. Therefore, similarly to the first embodiment, the seat width direction intermediate portion mainly in the rear intermediate portion 36 of the cushion airbag 30 is pushed toward the side of the concave portion between the ischial lower end P3s in the ischial bone PW of the seated occupant P. On the other hand, the range from the hip joint P2 of the seated occupant P to the lower end P3 of the ischium is not strongly pushed up. Therefore, the same effect as that of the first embodiment can be obtained.

Further, in the present embodiment, the cushion panel 52 is deformed so as to allow the rear side portion 34 of the cushion airbag 30 to expand downward to the seat when the cushion airbag 30 is inflated while the occupant is seated. When the airbag 30 is inflated, the upper surface of the rear side portion 34 of the cushion airbag 30 (of the hip joint corresponding portion 34A) with respect to the height position of the upper surface 36U of the intermediate portion in the seat width direction in the rear intermediate portion 36 of the cushion airbag 30. The height position of the upper surface (the upper surface including the upper surface 34U) can be easily lowered. Further, in the present embodiment, since the cushion panel 52 is flush with each other in the state before the cushion airbag 30 is expanded, it does not affect the sitting comfort.

As a modification of the third embodiment, in the cushion panel (52), the portion other than the panel rear side portion (52B) is replaced with the reinforcing beads 54A, 54B, 54C, for example, in the front-rear direction of the seat. Other reinforcing structures such as a plurality of extending reinforcing beads, a plurality of reinforcing beads convex on the upper side of the seat, a plurality of ribs, and the like may be applied.

Further, as another modification of the third embodiment, the reinforcing beads 54A, 54B, and 54C are not formed, and the fragile portion (for example, a slit) for reducing the rigidity of the seat rear side portion (52B) in the vertical direction of the seat is formed. By forming holes (such as holes and thin walls) in the rear side portion (52B) of the panel, the rear side portion (52B) of the panel becomes a cushion airbag (52B) when the cushion airbag (30) is inflated while the occupant is seated. By receiving the expansion pressure of 30), the panel rear side portion (52B) may be set to be lowered to the lower side of the seat than at least the seat width direction intermediate portion of the panel rear intermediate portion (52A).

[Supplementary Description of Embodiment]
As a modification of the second and third embodiments, the panel rear side portions (42B and 52B) have holes in which a part of the rear side portion (34) of the inflated cushion airbag (30) enters. A through-formed structure can also be adopted.

Further, in the above embodiment, the cushion airbag 30 has a quadrangular shape in a plan view, but in the cushion airbag, for example, the left and right side end portions at the rear portion are sewn portions shown in FIG. 1 in a plan view. It may be formed in another shape such as the shape corresponding to the sewing line of 38.

Further, as a modification of the first embodiment, the inner surface sides of the cushion airbag (30) are connected to each other by using a connecting member (for example, a string-shaped member) other than the sewing thread and the tether (not shown) of the sewing portion 38. By restricting the expansion thickness of the rear side portion (34) in the vertical direction of the seat when the cushion airbag (30) is inflated, the rear side portion (34) of the cushion airbag (30) can be expanded. The expansion thickness of the seat in the vertical direction may be set to be thinner than the expansion thickness of the rear intermediate portion (36) in the vertical direction of the seat when the cushion airbag (30) is inflated.

Further, as a modification of the above embodiment, when the cushion airbag is inflated while the occupant is seated, the cushion airbag is, for example, in the rear left and right regions (A2) with respect to the upper surface of the intermediate portion in the seat width direction. The upper surface of the portion inside the seat width direction in A1 and A3) may be set to be one step lower.

Further, although the rear suture portion 60C shown in FIG. 10B has an arc shape, a configuration in which the rear suture portion has a linear shape or the like can be adopted as a modified example.

The above-described embodiment and the above-described modification can be combined and implemented as appropriate.

Although an example of the present invention has been described above, the present invention is not limited to the above, and it goes without saying that the present invention can be variously modified and implemented within a range not deviating from the gist thereof. ..

10 Vehicle seat 14 Seat cushion 18 Cushion panel 20 Cushion airbag device 22 Inflator 30 Cushion airbag 30S Left and right side parts at the rear of the cushion airbag 32 Front 34 Rear side 34A Hip joint support 34B Seat bone lower end support 34U Hip joint Upper surface of corresponding part 36 Rear middle part 36U Upper surface of middle part in seat width direction in rear middle part 38 Sewing part 40 Vehicle seat 42 Cushion panel 42A Panel rear middle part 42B Panel rear side part 44 Cushion airbag device 50 Vehicle seat 52 Cushion panel 52A Panel rear middle part 52B Panel rear side part 54 Cushion airbag device 60 Cushion airbag 60S Suture part 60B Side side suture part 60C Rear side suture part (sewn part)
60C1 End located at the folded part in the posterior suture (rear end of the posterior suture)
60X Inflator placement area 62 Base cloth 62X Folded part HP Hip point P Seated occupant D Thigh P2 Hip joint PS Lower ischial bone P3 Lower ischial bone A1, A3 Rear left and right area A2 Rear central area X First direction Y Second direction

Claims (8)

The cushion panel that extends in the front-rear direction of the seat and constitutes the bottom of the seat cushion,
An inflator provided inside the seat cushion and generating gas by operating,
A cushion airbag provided on the cushion panel that expands by receiving the supply of gas generated by the inflator and pushes up the range including the portion from the thigh to the hip point of the seated occupant in the expanded state. When,
With
In the cushion airbag, the pushing force in the rear left and right regions corresponding to the left and right hip joints of the seated occupant in the expanded state to the lower part of the ischium is the pushing force in the rear central region between the rear left and right regions in the expanded state. A vehicle seat with a built-in cushion airbag device that is set to be less than the force. The cushion airbag
The front part including the part corresponding to the thigh of the seated occupant,
A pair of left and right rear side parts set in the range from the hip joint corresponding part, which is the part corresponding to the hip joint of the seated occupant, to the ischial lower end corresponding part, which is the part corresponding to the lower end of the ischial bone of the seated occupant.
The rear middle portion arranged between the pair of left and right rear side portions and the rear intermediate portion,
And when the cushion airbag is inflated while the occupant is seated, the upper surface of the hip joint corresponding portion of the rear side portion is set to be one step lower than the upper surface of the intermediate portion in the seat width direction in the rear intermediate portion. A vehicle seat incorporating the cushion airbag device according to claim 1. The expansion thickness of the rear side portion in the vertical direction of the seat when the cushion airbag is inflated is set to be thinner than the expansion thickness of the rear intermediate portion in the vertical direction of the seat when the cushion airbag is inflated. , A vehicle seat incorporating the cushion airbag device according to claim 2. The left and right side portions of the rear part of the cushion airbag are connected to the portions of the left and right side portions that overlap each other in the vertical direction of the seat, and the rear side portion expands in the vertical direction of the seat when the cushion airbag is inflated. A vehicle seat incorporating the cushion airbag device according to claim 3, which is provided with a sewn portion or a tether that regulates the thickness. The cushion panel is
The rear middle part of the panel, which is the part corresponding to the rear middle part,
A panel rear side portion arranged outside in the seat width direction with respect to the panel rear intermediate portion, and a panel rear side portion.
Have,
The cushion airbag device according to any one of claims 2 to 4, wherein the rear side portion of the panel is located below the intermediate portion in the seat width direction at least in the rear intermediate portion of the panel. Vehicle seats. The cushion panel is
The rear middle part of the panel, which is the part corresponding to the rear middle part,
A panel rear side portion arranged outside in the seat width direction with respect to the panel rear intermediate portion, and a panel rear side portion.
Have,
When the cushion airbag inflates while the occupant is seated, the rear side portion of the panel receives the expansion pressure of the cushion airbag and lowers the rear middle portion of the panel to the lower side of the seat than at least the intermediate portion in the seat width direction. A vehicle seat incorporating the cushion airbag device according to any one of claims 2 to 4, which is set as such. The inflator is arranged in a portion of the cushion airbag on the front side of the seat.
The cushion airbag is formed by suturing a base cloth folded back at a central portion so as to be overlapped in the vertical direction, and the folded portion of the base cloth covers an end portion of the cushion airbag on the rear side of the seat. Configured and placed along the seat width direction,
The sewn portion of the cushion airbag
A pair of side stitches provided on both sides in the seat width direction and extending in the front-rear direction of the seat,
A pair of rear sewn portions extending diagonally rearward in the seat width direction from each rear end of the pair of side sewn portions to the intermediate portion in the seat width direction of the folded portion, and the rear ends are separated from each other.
A vehicle seat incorporating the cushion airbag device according to any one of claims 1 to 6. A cushion airbag in which an inflator is stored on the front side of the seat when mounted on the vehicle seat, and corresponds to the left and right hip joints of the seated occupant of the vehicle seat to the lower part of the ischium in the expanded state. In a cushion airbag in which the pushing force in the rear left and right regions is set to be smaller than the pushing force in the rear center region between the rear left and right regions in the expanded state.
The cushion airbag is formed by suturing a base cloth folded back at a central portion so as to be overlapped in the vertical direction, and is formed inside the cushion airbag at a portion opposite to the folded portion side of the base cloth. A part where the inflator is placed is provided,
The sewn portion of the cushion airbag
A pair of side stitched portions provided on both sides of the first direction along the extending direction of the folded portion and extending along the second direction orthogonal to the first direction.
Each end on the side of the folded portion of the pair of side stitched portions extends diagonally from each end of the folded portion to the intermediate portion of the folded portion in the first direction so as to approach each other, and the end portion located at the folded portion is formed. A pair of posterior sutures separated from each other,
Cushion airbag with.

Images