JP2021054098A - Crewman protection device - Google Patents

Abstract

To provide a crewman protection device which can smoothly protect a crewman which wears a seat belt and sits on a seat.SOLUTION: A crewman protection device comprises a seat belt 10, and an air bag 25 which is folded and stored in a seat 1. The air bag expands so as to project forward in such a manner that an expansion gas is flown into the interior thereof, at the time of expansion completion, is interposed between the seat belt, which a crewman wears, and the crewman, and continuously covers both sides of the occupant on a longitudinal direction side from both sides of a lumbar part MW to the top of head. Further, a lumbar part protection part 40L, which extends downward with respect to a seating face 6a of a seat cushion 6 and arrests the lumbar part of the crewman, is provided on the side of the lumbar part of the crewman on a lower end side at the time of expansion.SELECTED DRAWING: Figure 7

Description

The present invention relates to an occupant protection device for protecting an occupant seated on a seat by wearing a seat belt.

Conventionally, as an occupant protection device, there has been a configuration in which an airbag is inflated so as to surround both sides of an occupant seated on a seat including the crown (see, for example, Patent Documents 1 and 2). Specifically, in the occupant protection device described in Patent Document 1, the airbag that has completed expansion covers the area of the upper body of the occupant above the lumbar region. In the occupant protection device described in Patent Document 2, the airbag that has completed expansion is configured to cover up to the lateral region of the lumbar region.

U.S. Pat. No. 10112570 International Publication No. 2018/114723

However, in the conventional occupant protection device, there is no description about the seat belt for restraining the occupant seated on the seat.

The present invention solves the above-mentioned problems, and an object of the present invention is to provide an occupant protection device capable of smoothly protecting an occupant who is seated on a seat by wearing a seat belt.

The occupant protection device according to the present invention is an occupant protection device for protecting an occupant seated on a seat by wearing a seat belt.
It is configured to include a seat belt and an airbag that can be folded and stored in the seat.
The airbag
The expansion gas flows into the interior and expands so as to protrude forward. When the expansion is completed, it is interposed between the seatbelt worn by the occupant and the occupant, and on the left-right side of the occupant. It is configured to continuously cover both sides of the waist from both sides of the lumbar region to the crown.
It is characterized in that a lumbar protection portion that extends downward from the seating surface of the seat cushion and restrains the lumbar portion of the occupant is arranged on the side of the lumbar portion of the occupant on the lower end side when the expansion is completed. ..

In the occupant protection device of the present invention, the airbag is configured to expand so as to be interposed between the seatbelt worn by the occupant and the occupant, in other words, the outside of the airbag that has completed expansion. Can be pressed by the seat belt. Therefore, even if the occupant is seated with the seatbelt fastened, the occupant is accurately restrained by the airbag that is inflated so as to cover both sides of the left and right sides from both sides of the lumbar region to the crown. can do. Further, in the occupant protection device of the present invention, the lumbar protection portion for restraining the lumbar region of the occupant is arranged on the lower end side of the airbag so as to extend downward from the seat surface of the seat cushion. Can be stably restrained, and the movement of the occupant in the left-right direction can be accurately regulated.

Therefore, the occupant protection device of the present invention can smoothly protect the occupant seated on the seat by wearing the seat belt.

Further, in the occupant protection device of the present invention, if the airbag is folded and stored on the outer edge side of the seat in which the headrest is integrated, the air that integrally covers the occupant's side from the waist to the head. Since the bag can be continuously stored on the outer edge side of the seat, the airbag can be expanded and expanded so as to protrude forward from the storage area, and the airbag can be smoothly expanded and expanded. be able to.

Further, in the occupant protection device having the above configuration, a plurality of expansion portions are arranged side by side in the vertical direction by the compartments arranged substantially along the front-rear direction when the expansion is completed, and after the expansion is completed. In the region extending from the waist to the side of the crown on the edge side, a gas guide flow path which is connected to the gas supply part and can guide the expansion gas supplied from the gas supply part into the expansion part is arranged. For example, since the expansion gas supplied from the gas supply unit can flow into each expansion unit via the gas guide flow path extending vertically, the airbag is wide in the vertical direction from the waist to the crown of the occupant. Even if it is configured to cover a range, the airbag can be inflated quickly, which is preferable.

Further, in the occupant protection device having the above configuration, a head protection portion that protects the occupant's head, a shoulder protection portion that restrains the occupant's shoulder, and an occupant's shoulder are used as an expansion portion of the airbag when the expansion is completed. The body protection part that protects from the chest to the abdomen and the waist protection part are arranged side by side in the vertical direction.
It is preferable that the body portion protecting portion is configured to expand by allowing an expansion gas to flow into the inside through any of the head portion protecting portion, the shoulder portion protecting portion, and the lumbar portion protecting portion.

With such a configuration of the occupant protection device, the body protection portion that protects the occupant from the chest to the abdomen can be inflated later than the head protection portion, the shoulder protection portion, or the lumbar protection portion. Since it can be done, the area from the chest to the abdomen can be softly received by the body protection part. Of course, in the occupant protection device having such a configuration, the shoulders and waist of the occupant can be received by the shoulder protection and the lumbar protection that expand rapidly, so that the occupant can move to the left and right side accurately. Can be suppressed.

Furthermore, in the occupant protection device having the above configuration, the body protection unit is
When the airbag has been inflated, a chest protection area that is placed in front of the shoulder protection and covers the sides of the chest,
It is configured to have an abdominal protection area located below the chest protection area and above the lumbar protection area and covering the sides of the abdomen.
The chest protection area is partitioned from the shoulder protection part, and the expansion gas is allowed to flow into the inside through the head protection part to expand.
It is preferable that the abdominal protection region is configured to expand by inflowing an expansion gas into the inside through the chest protection region.

With such a configuration of the occupant protection device, even if the shoulder portion of the occupant is quickly restrained by the shoulder protection portion, the chest near the shoulder portion expands inward through the head protection portion. It can be softly protected by a chest protection area that allows gas to flow in and expands later than the shoulder protection area, and the abdomen is also partitioned from the lumbar protection area and inside through the chest protection area. It can be softly protected by the abdominal protection area that expands by inflowing expansion gas.

Furthermore, in the occupant protection device having the above configuration, if the seat belt is mounted on the seat, the seat can be largely slid back and forth or the seat itself can be rotated to move the seat significantly with respect to the vehicle. Even in this state, the inflated airbag makes it possible to accurately protect the occupant seated in the seat, which is preferable.

It is a front view of the seat which mounted the occupant protection device which is one Embodiment of this invention. It is a side view of the sheet of FIG. It is a side view of the airbag used in the occupant protection device of an embodiment. It is a schematic vertical sectional view of the state in which the airbag of FIG. 3 is inflated by itself. It is a schematic cross-sectional view of the state in which the airbag of FIG. 3 is inflated by itself, and is the figure which shows the part of the chest protection region. It is a front view of the seat in the state where the airbag is completed inflated in the occupant protection device of the embodiment. It is a side view of the seat in the state where the airbag is completed inflated in the occupant protection device of the embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the occupant protection device S of the embodiment is mounted on the seat 1 of the vehicle, and is a gas that supplies an expansion gas to the seat belt 10, the airbag 25, and the airbag 25. It is provided with inflators 20L and 20R as a supply unit.

The seat 1 on which the occupant protection device S of the embodiment is mounted includes a seat back 2 in which a headrest portion 4 and a backrest portion 3 are integrated, and a seat cushion 6.

The seat belt 10 is mounted on the seat 1, and as shown in FIGS. 1 and 2, the belt main body 11 for restraining the occupant MP seated on the seat 1 and the tongue plate 15 attached to the belt main body 11 , A buckle 16 for connecting the tongue plate 15 and the like. One end of the belt main body 11 is locked to a take-up shaft of a retractor (not shown) arranged in the seat back 2, and one end thereof is projected from an insertion hole 2b arranged on the upper left edge side of the seat back 2 and the other end. The side is locked to an anchor member 17 (see FIG. 2) arranged on the left side of the rear end of the seat cushion 6 in the seat 1. The belt body 11 is the lower body of the occupant MP by the wrap belt 13 arranged substantially along the left-right direction between the anchor member 17 and the buckle 16 in a state where the tongue plate 15 is connected to the buckle 16 when the occupant is seated. The upper body MU (from the shoulder MS to the abdomen MA) of the occupant MP is restrained by the shoulder belt 12 that restrains the MD (lumbar MW) and is arranged diagonally from the insertion hole 2b on the upper left edge side of the seat back 2 to the buckle 16. ) Is constrained (see FIGS. 1 and 2). In the case of the embodiment, the seat belt 10 allows the expanding airbag 25 to be interposed between the belt body 11 (shoulder belt 12, wrap belt 13) and the occupant MP when the airbag 25 is expanded and expanded. The belt body 11 can be extended from the retractor as the belt body 11 expands. Further, the seatbelt 10 has occupant restraint performance even when the belt body 11 is extended from the retractor after the expansion of the airbag 25 is completed, and holds the outside of the airbag 25 that has been expanded and holds the seat. It is configured so that the occupant MP moving forward with respect to 1 can be restrained.

In the case of the embodiment, two inflators 20L and 20R as gas supply units are arranged so as to supply expansion gas to the left side cover portion 26L and the right side cover portion 26R, which will be described later, in the airbag 25, respectively. ing. As shown in FIG. 2, each of the inflators 20L and 20R is a cylinder type having a substantially cylindrical outer shape, and is attached to a seat frame (not shown), although detailed illustration is omitted. Specifically, the inflators 20L and 20R substantially follow the axial direction in the vertical direction at positions on the outer edge 2a side of the seat back 2 at positions on the left and right sides of the abdominal MA of the occupant MP seated on the seat 1. It is arranged so as to be able to (see FIG. 1). The inflators 20L and 20R supply expansion gas into the airbag 25 (left side cover portion 26L, right side cover portion 26R) during operation, and each connection port formed in the left side cover portion 26L and the right side cover portion 26R. It is configured to be connected to the left side cover portion 26L and the right side cover portion 26R by using a clamp 55 that is inserted into the portions 29L and 29R and arranged on the outer peripheral side of the connection port portions 29L and 29R (FIG. 3). See two-dot chain line). The inflators 20L and 20R are electrically connected to a control circuit (not shown) to control the operation, and when a vehicle collision is detected, an operation signal is input to the airbag 25 (left side cover part 26L, right side cover part). The configuration is such that the expansion gas flows out into 26R).

The airbag 25 is folded and stored in the seat 1, and in the case of the embodiment, the airbag 25 is folded and stored on the outer edge 2a side of the seat back 2. Specifically, the folded airbag 25 is continuous over the entire circumference of the outer edge 2a of the seat back 2 so as to continuously surround the circumference of the occupant MP seated on the seat 1 from the left and right sides to the crown HU. (See FIGS. 1 and 2). More specifically, the folded airbag 25 is housed in the seat back 2 at a position on the left and right inside of the insertion hole 2b in which the belt body 11 of the seat belt 10 is projected (FIG. FIG. 1). Further, the folded airbag 25 is housed in the seat back 2 at a position on the front side (front side along the thickness direction of the seat back 2) with respect to the insertion hole 2b.

When the inflators 20L and 20R are operated, the airbag 25 inflows expansion gas into the airbag 25 and expands so as to project forward from the storage area (seat back 2). When the expansion is completed, the airbag 25 is left and right of the occupant MP. Both sides on the directional side are continuously covered from both sides of the lumbar MW to the crown HU (see FIGS. 6 and 7). Specifically, the airbag 25 includes a left side cover portion 26L and a right side cover portion 26R, which are separate bodies, and the left side cover portion 26L and the right side cover portion 26R are connected to each other by the upper edges 26a and 26a (the upper edges 26a and 26a are connected to each other. By combining), they are integrated (see FIGS. 3 and 4) and continuously cover the sides of the occupant MP including the crown HU. As shown in FIG. 6, the left side cover portion 26L covers the left side of the occupant MP from the crown HU to the lumbar portion MW, and the right cover portion 26R covers the right side of the occupant MP from the crown HU to the lumbar region. It is configured to cover the MW. As described above, the left side cover portion 26L and the right side cover portion 26R are configured to expand by inflowing expansion gas from the inflators 20L and 20R, respectively. The left side cover portion 26L and the right side cover portion 26R are configured with substantially the same outer shape, and the expansion completed shape is formed into a substantially rectangular plate shape as shown in FIG. 7, and the width dimension on the front-rear direction side is defined. The dimensions are set so as to cover the entire upper body MU of the occupant MP and the side of the lumbar MW of the occupant MP including the area up to the knee in the thigh, and the length on the vertical side. The dimensions are set so that the rear edge side portion (rear lower end 40a side) of the lumbar protection portions 40L and 40R on the lower end 26b side, which will be described later, is located below the seat surface 6a of the seat cushion 6. There is.

Since the left side cover portion 26L and the right side cover portion 26R are set to have the same outer shape and configuration, in the embodiment, the left side cover portion 26L will be taken as an example and will be described in detail. As shown in FIG. 3, the left side cover portion 26L has a substantially rectangular shape with the longitudinal direction along the vertical direction side, and in the case of the embodiment, a predetermined portion of the woven fabric made of polyamide yarn or polyester yarn is formed. , It is made into a bag shape by sewing with suture. The left side cover portion 26L is a gas that expands by inflowing an expansion gas G into the inside so as to separate the inner side wall portion 27a located on the inner side (occupant MP side) and the outer wall portion 27b located on the outer side when the expansion is completed. It is provided with an inflow portion 27L and a non-inflow portion 45L (closed portion) formed by coupling the inner side wall portion 27a and the outer wall portion 27b to prevent the expansion gas from flowing in (see FIGS. 3 to 5).

As shown in FIG. 3, the gas inflow portion 27L has a gas guide flow path 28L arranged so as to extend in the vertical direction on the trailing edge 26c side of the left side cover portion 26L, and a connection port portion connected to the inflator 20L. 29L and lateral expansion portions 32AL, 32BL, 32CL, 32DL, 32EL as expansion portions (five in the case of the embodiment) arranged side by side in the vertical direction on the front side of the gas guide flow path 28L are provided. ing.

The gas guide flow path 28L is arranged over substantially the entire upper and lower sides on the trailing edge 26c side of the left side cover portion 26L. In other words, the gas guide flow path 28L covers the side of the occupant MP when the expansion is completed. At that time, it is arranged in the region extending from the lumbar portion MW to the side of the head portion MH (crown portion HU) on the trailing edge 26c side of the left side cover portion 26L (see FIG. 7). The connection port portion 29L is communicated with the gas guide flow path 28L at substantially the center above and below the gas guide flow path 28L, is inclined backward with respect to the gas guide flow path 28L, and is inclined rearward from the gas guide flow path 28L. It is formed so as to protrude. The connection port 29L has an inflator 20L open at the lower end 29a side so that the inflator 20L can be inserted. That is, the gas guide flow path 28L is connected to the inflator 20L as the gas supply unit via the connection port portion 29L, and the expansion gas G supplied from the inflator 20L is supplied to the lateral expansion portions 32AL, 32BL, respectively. It is configured so that it can be guided in 32CL, 32DL, and 32EL (expansion part). Further, in the embodiment, a protruding region 28a that partially protrudes forward is formed in the vicinity of the upper and lower centers of the gas guide flow path 28L. The protruding region 28a is arranged adjacent to the rear side of the lateral expansion portion 32CL (the chest protection region 38L of the body protection portion 37L described later), and the expansion gas from the gas guide flow path 28L is inside. It constitutes an expansion part that expands by flowing in. The protruding region 28a constitutes the shoulder protection portion 36L.

The lateral expansion portions 32AL, 32BL, 32CL, 32DL, and 32EL are partitioned by partition portions 48L, 49L, 50L, and 51L, which will be described later, and are arranged side by side in the vertical direction. Has been done. In the case of the embodiment, the two lateral expansion portions 32AL and 32BL arranged on the upper side constitute the head protection portion 35L that protects the head MH of the occupant MP, and the lateral expansion portion 32EL arranged on the lower end side constitutes the head protection portion 35L. , The lumbar protection portion 40L that restrains the lumbar MW of the occupant MP is configured. Further, two laterally expanding portions 32CL and 32DL arranged in the intermediate portion constitute a body protection portion 37L that protects the occupant MP from the chest MB to the abdominal MA. Further, as described above, the protruding region 28a, which is disposed adjacently on the rear side of the lateral expansion portion 32CL and is formed by partially projecting the gas guide flow path 28L, restrains the shoulder portion MS of the occupant MP. The shoulder protection portion 36L is configured.

The lateral expansion portions 32AL and 32BL constituting the head protection portion 35L are partitioned by the partition portion 48L, and the rear end side is communicated with the gas guide flow path 28L, and the front end side is also mutually connected. It is communicated. Specifically, the lateral expansion portion 32AL constituting the upper region of the head protection portion 35L covers the vicinity of the crown HU of the occupant MP when the expansion is completed, and covers the lower region of the head protection portion 35L. When the expansion is completed, the constituent lateral expansion portion 32BL covers the side of the head MH of the occupant MP (see FIGS. 6 and 7). The lower lateral expansion portion 32BL has a large width dimension on the vertical direction side so as to be able to widely cover the side of the head MH.

The lateral expansion portion 32CL constituting the body portion protection portion 37L is partitioned by the partition portion 50L from the lateral expansion portion 32BL constituting the head protection portion 35L. The lateral expansion portion 32DL is partitioned from the lumbar protection portion 40L (lateral expansion portion 32EL) by the partition portion 51L. Further, the lateral expansion portions 32CL and 32DL constituting the body portion protection portion 37L are partitioned by the partition portion 50L. Further, the lateral expansion portions 32CL and 32DL constituting the body portion protection portion 37L are partitioned from the gas guide flow path 28L (shoulder protection portion 36L) by the vertical partition portion 52L described later. The lateral expansion portion 32CL arranged on the upper side has a configuration in which the rear end side (shoulder protection portion 36L side) is closed and the lateral expansion portion 32BL constituting the head protection portion 35L is communicated with the front end side. As shown in FIGS. 6 and 7, the lateral expansion portion 32CL constitutes a chest protection region 38L that covers the side of the chest MB of the occupant MP when the expansion is completed. That is, the chest protection region 38L is partitioned from the shoulder protection portion 36L, and the expansion gas is allowed to flow into the inside through the head protection portion 35L to expand. The lateral expansion portion 32DL disposed on the lower side has a configuration in which the front end side is closed and the lateral expansion portion 32CL is communicated with the upper lateral expansion portion 32CL at the rear end side portion. The lateral expansion portion 32DL is arranged below the chest protection region 38L and above the lumbar protection portion 40L, and constitutes an abdominal protection region 39L that covers the side of the abdominal MA of the occupant MP when the expansion is completed. (See FIGS. 6 and 7), the abdominal protection region 39L has a configuration in which the expansion gas flows into the inside only from the chest protection region 38L. Further, in the case of the embodiment, as shown in FIG. 3, the communication portion 43L that communicates the abdominal protection region 39L (lateral expansion portion 32DL) and the chest protection region 38L (lateral expansion portion 32CL) is the chest protection region 38L (lateral expansion portion 32L). The opening width dimension is set smaller than that of the communication portion 42L that communicates the expansion portion 32CL) and the head protection portion 35L (lateral expansion portion 32BL). This abdominal protection region 39L expands by delaying the inflow of expansion gas into the inside as compared with the head protection portion 35L, the lumbar protection portion 40L, and the shoulder protection portion 36L, and the opening width of the communication portion 43L. Since the dimensions are set small, in the case of the embodiment, when the shoulder protection portion 36L and the lumbar protection portion 40L restrain the shoulder MS and the lumbar MW of the occupant MP after the expansion of the airbag 25 is completed, The expansion gas will flow into the interior to expand.

The lateral expansion portion 32EL constituting the lumbar protection portion 40L has a configuration in which the rear end side is communicated with the gas guide flow path 28L and the front end side is closed. The lateral expansion portion 32EL has a large width dimension on the vertical direction side so that the side of the lumbar portion MW of the occupant MP can be widely covered vertically when the expansion is completed. The lumbar protection portion 40L is configured so that the rear lower end 40a side, which is the gas guide flow path 28L side, is positioned below the seat surface 6a of the seat cushion 6 when the expansion is completed (FIG. 7). reference).

The non-inflow portion 45L (closed portion) includes a peripheral edge portion 46L constituting the outer peripheral edge of the gas inflow portion 27L, and compartmental portions 48L, 49L, 50L, 51L and vertical compartmental parts 52L arranged in the region of the gas inflow portion 27L. And have. As shown in FIG. 5, the peripheral edge portion 46L is formed so as to surround the entire circumference of the gas inflow portion 27L except for the lower end 29a side of the connection port portion 29L. On the trailing edge side of the peripheral edge portion 46L (the trailing edge 26c side of the left side cover portion 26L), mounting tabs 46a to be attached to a seat frame (not shown) are arranged at a plurality of locations along the vertical direction (see FIG. 3). ).

The compartments 48L, 49L, 50L, and 51L are arranged so as to partition the lateral expansion portions 32AL, 32BL, 32CL, 32DL, and 32EL in a substantially linear shape along the front-rear direction. The compartment 48L is configured as a linear shape that is substantially along the front-rear direction and is slightly curved so that both ends are directed upward. Within the region of the head protection portion 35L, the compartments between the lateral expansion portions 32AL and 32BL are partitioned. doing. The compartment 49L is configured as a straight line substantially along the front-rear direction so as to extend forward from the upper end of the vertical compartment 52L, and has a head protection portion 35L and a body protection portion 37L (chest protection region 38L). (Between the lateral expansion portions 32BL and 32CL) is partitioned. The compartment 50L is configured as a substantially straight line along the anterior-posterior direction so as to extend posteriorly from the front edge side portion of the peripheral edge 46L, and is between the chest protection area 38L and the abdominal protection area 39L (lateral expansion portion). (Between 32CL and 32DL) is partitioned. The compartment 51L is connected to the front edge side portion of the peripheral portion 46L as a substantially straight line along the front-rear direction so as to extend forward from the lower end of the vertical compartment 52L, and the body protection portion 37L (abdominal protection). The area 39L) and the lumbar protection portion 40L (between the laterally expanding portions 32DL and 32EL) are partitioned. The vertical compartment 52L is arranged substantially along the vertical direction so as to connect the rear ends of the compartments 49L and 51L, and partitions between the body protection portion 37L and the gas guide flow path 28L. ing. The vertical section 52L has a curved portion 52a that is curved so as to project forward at a portion on the upper end side (a portion on the lateral expansion portion 32CL side). The curved portion 52a constitutes the peripheral edge of the protruding region 28a (shoulder protection portion 36L) in the gas guide flow path 28L. Then, in the embodiment, the gap between the partition portion 49L and the peripheral portion 46L provides a communication portion 42L that communicates the chest protection region 38L (lateral expansion portion 32CL) and the head protection portion 35L (lateral expansion portion 32BL). The gap between the compartment 50L and the vertical compartment 52L forms a communication portion 43L that communicates the abdominal protection region 39L (lateral expansion portion 32DL) and the chest protection region 38L (transverse expansion portion 32CL). There is.

In the occupant protection device S of the embodiment, if the occupant MP seated on the seat 1 operates the inflators 20L and 20R in response to an operation signal from the control circuit when the vehicle collides with the seatbelt 10 attached, the airbag is air. The left side cover portion 26L and the right side cover portion 26R of the bag 25 expand by inflowing the expansion gas G discharged from the inflators 20L and 20R, respectively, and the airbag 25 expands as shown in FIGS. The expansion is completed so as to be interposed between the belt body 11 (shoulder belt 12, lap belt 13) of the seat belt 10 and the occupant MP while projecting forward from the seat back 2.

Then, in the occupant protection device S of the embodiment, the airbag 25 is interposed between the belt body 11 (shoulder belt 12, wrap belt 13) of the seat belt 10 worn by the occupant MP and the occupant MP. In other words, the outside of the airbag 25 that has completed expansion can be pressed by the belt body 11 of the seat belt 10. Therefore, even when seated on the seat 1 with the seat belt 10 attached, the airbag inflates so as to cover both sides of the occupant MP in the left-right direction from both sides of the lumbar MW to the crown HU. With 25, it can be accurately restrained. Further, in the occupant protection device S of the embodiment, as shown in FIG. 7, the lumbar protection portions 40L and 40R for restraining the lumbar portion MW of the occupant MP are provided on the lower end 26b side of the airbag 25 with the seat surface 6a of the seat cushion 6. Since the configuration is arranged so as to extend downward, the lumbar MW can be stably restrained, and the movement of the occupant MP in the left-right direction can be accurately regulated.

Therefore, in the occupant protection device S of the embodiment, the occupant MP seated on the seat 1 by wearing the seat belt 10 can be smoothly protected.

In the occupant protection device S of the embodiment, an inflated airbag 25 is interposed between the seatbelt 10 and the occupant MP, and the seatbelt 10 and the airbag 25 protect the occupant MP. Since the airbag 25 that has completed expansion mainly restrains the head MH, shoulder MS, and waist MW of the occupant MP, the occupant is protected at the time of restraint as compared with the case where the occupant is protected only by the seat belt. , The reaction force acting on the occupant can be suppressed from being concentrated on a part (for example, the chest and abdomen), and the occupant can be softly restrained.

Further, in the occupant protection device S of the embodiment, since the airbag 25 is folded and stored on the outer edge 2a side of the seat 1 in which the headrest (headrest portion 4) is integrated, the side of the occupant MP The airbag 25 that integrally covers the waist MW to the head MH on the side can be continuously stored on the outer edge 2a side of the seat 1, and the airbag 25 is deployed so as to project forward from the storage area. The airbag 25 can be smoothly expanded and expanded. If such a point is not taken into consideration, the folded airbag may be stored in a seat having a headrest separate from the seat back.

Further, in the occupant protection device S of the embodiment, the airbag 25 is arranged on the vertical side by the compartments 48L, 48R, 49L, 49R, 50L, 50R, 51L, 51R which are arranged substantially along the front-rear direction when the expansion is completed. A plurality of lateral expansion portions 32AL, 32AR, 32BL, 32BR, 32CL, 32CR, 32DL, 32DR, 32EL, 32ER (expansion portions) are arranged side by side, and from the waist MW on the trailing edge 26c side when expansion is completed. The expansion gas G supplied from the inflators 20L and 20R, which is connected to the inflators 20L and 20R as gas supply portions, is connected to the lateral expansion portions 32AL and 32AR in the region extending to the side of the crown HU (nearly the entire upper and lower parts). The gas guide channels 28L and 28R that can be guided in the 32BL, 32BR, 32CL, 32CR, 32DL, 32DR, 32EL, and 32ER are arranged (see FIG. 7). Therefore, the expansion gas supplied from the inflators 20L and 20R passes through the gas guide flow paths 28L and 28R extending vertically, and the lateral expansion portions 32AL, 32AR, 32BL, 32BR, 32CL, 32CR, 32DL, 32DR, 32EL, Since the airbag 25 can flow into the 32ER, the airbag 25 can be rapidly inflated even if the airbag 25 is configured to cover a wide range up and down from the lumbar MW to the crown HU of the occupant MP. it can. In particular, in the occupant protection device S of the embodiment, each lateral expansion portion 32AL, 32AR, 32BL, 32BR, 32CL, 32CR, 32DL, 32DR, 32EL, 32ER constituting the airbag 25 contracts the width dimension on the vertical direction side. When the expansion is completed, both sides of the occupant MP expand from the waist MW to the head MH (crown HU), so that the lateral expansion portions 32AL, 32AR, 32BL, 32BR, 32CL, 32CR, 32DL, The airbag 25 in which 32DR, 32EL, and 32ER are connected without a gap will be covered in close proximity (see FIG. 6), and the upper side of the crown HU is also covered by the lateral expansion portions 32AL and 32AR. Therefore, the head MH of the occupant MP can be smoothly protected even when the vehicle rolls over. If such a point is not taken into consideration, the airbag may be configured not to have a gas guide flow path or to have a plurality of expansion portions arranged side by side in the front-rear direction. Good.

Further, in the occupant protection device S of the embodiment, the air bag 25 at the time of completion of expansion has the head protection portions 35L and 35R for protecting the head MH of the occupant MP and the shoulder protection for restraining the shoulder MS of the occupant MP. The parts 36L and 36R, the body protection parts 37L and 37R that protect the occupant MP from the chest MB to the abdomen MA, and the lumbar protection parts 40L and 40R are arranged side by side in the vertical direction. The protection portions 37L and 37R allow the expansion gas to flow into the inside through any of the head protection portion, the shoulder protection portion, and the lumbar protection portion (in the case of the embodiment, the head protection portions 35L and 35R). It is configured to expand. Therefore, the body protection portions 37L and 37R that protect the occupant MP from the chest MB to the abdominal MA are delayed from the head protection portions 35L and 35R, the shoulder protection portions 36L and 36R, or the lumbar protection portions 40L and 40R. The area from the chest MB to the abdominal MA can be softly received by the body protection portions 37L and 37R. Of course, in the occupant protection device S of the embodiment, the shoulder MS and the lumbar MW of the occupant MP can be received by the rapidly expanding shoulder protection portions 36L and 36R and the lumbar protection portions 40L and 40R. The movement to the left-right direction can be accurately suppressed.

Furthermore, in the occupant protection device S of the embodiment, the body protection portions 37L and 37R are arranged on the front side of the shoulder protection portions 36L and 36R when the expansion of the airbag 25 is completed, and the side of the chest MB of the occupant MP. It is configured to have chest protection areas 38L and 38R that cover one side, but these chest protection areas 38L and 38R are partitioned from shoulder protection parts 36L and 36R, and are inside via head protection parts 35L and 35R. It is configured to expand by inflowing expansion gas. Further, the body protection portions 37L and 37R are arranged below the chest protection regions 38L and 38R and above the lumbar protection portions 40L and 40R to cover the abdominal protection regions 39L and 39R that cover the sides of the abdominal MA. The abdominal protection areas 39L and 39R are configured to expand by inflowing an expansion gas into the inside through the chest protection areas 38L and 38R. Therefore, even if the shoulder MS of the occupant MP is quickly restrained by the shoulder protection portions 36L and 36R, the chest MB in the vicinity of the shoulder MS is expanded inward via the head protection portions 35L and 35R. It can be softly protected by the chest protection areas 38L and 38R that expand later than the shoulder protection parts 36L and 36R by allowing the gas to flow in, and the abdominal MA can also be protected by the lumbar protection parts 40L and 40R. It can be softly protected by the abdominal protection areas 39L and 39R that expand by inflowing the expansion gas into the inside through the chest protection areas 38L and 38R.

Specifically, in the airbag 25 of the embodiment, taking the left side cover portion 25L as an example and explaining in detail, the expansion gas G flowing into the gas guide flow path 28L through the connection port portion 29L is a gas guide. Approximately at the same time as flowing upward or downward in the flow path 28L, it flows into the shoulder protection portion 36L to inflate the shoulder protection portion 36L, and then in the head protection portion 35L and the lumbar protection portion 40L. It flows into the inside and inflates the head protection portion 35L and the lumbar protection portion 40L. Next, the expansion gas flows into the chest protection region 38L of the body protection portion 37L from the communication portion 42L on the front end side via the lateral expansion portion 32BL constituting the head protection portion 35L, and the chest protection region. 38L will expand. After that, the expansion gas flows into the abdominal protection region 39L of the body protection portion 37L through the chest protection region 38L and from the communication portion 43L on the rear end side. Therefore, in the airbag 25 of the embodiment, the shoulder MSs of the occupant MP can be quickly restrained by the shoulder protection portions 36L and 36R, and then the lumbar portion MW of the occupant MP can be quickly restrained by the lumbar protection portions 40L and 40R. It can be restrained, and at the same time, the circumference of the head MH of the occupant MP can be widely covered by the head protection portions 35L and 35R. Therefore, the movement of the occupant MP in the left-right direction can be quickly regulated by pressing the shoulder MS and the lumbar MW. The chest protection areas 38L and 38R are configured to allow expansion gas to flow into the inside from the front end side away from the gas guide flow paths 28L and 28R, so that the chest protection areas 38L and 38R are surely delayed compared to the shoulder protection areas 36L and 36R. The chest MB of the occupant MP in a state where the shoulder MS and the lumbar MW are restrained can be softly received by the chest protection areas 38L and 38R, and the abdominal MA of the occupant MP can be received. However, it can be softly received by the abdominal protection areas 39L and 39R that expand further later.

Furthermore, in the occupant protection device S of the embodiment, since the seat belt 10 is mounted on the seat 1, for example, the seat 1 can be largely slid back and forth or the seat 1 itself can be rotated. The inflated airbag 25 can accurately protect the occupant MP seated on the seat 1 even when the vehicle is largely moved with respect to the vehicle. In the occupant protection device S of the embodiment, the airbag 25 that is inflated so as to widely cover the left and right sides of the occupant MP seated on the seat 1 and the occupant MP are restrained via the airbag 25. The belt body 11 of the seat belt 10 can regulate the lateral movement of the occupant MP with respect to the seat 1 and the forward movement of the occupant MP with respect to the seat 1. Therefore, the occupant MP seated on the seat 1 is accurately protected by the airbag 25 and the seat belt 10 without being affected by the arrangement position and orientation of the seat 1 with respect to the vehicle and the direction of impact force on the vehicle. be able to. If such a point is not taken into consideration, the present invention is applied to a seat equipped with a seatbelt having a retractor provided on the vehicle body side, such as a seatbelt mounted on a normal vehicle seat. It may be applied.

In the embodiment, as the airbag 25, the left side cover portion 26L and the right side cover portion 26R, which are separate bodies, are integrated by connecting the upper edges 26a to each other, and the left side cover portion 26L and the right side cover portion 26L are integrated. The cover portion 26R is connected to the inflators 20L and 20R as gas supply portions, respectively. However, the airbag has an integrated structure that covers the occupant from the left side to the right side, and is inflated by one inflator. May be used. Further, the inflator as the gas supply unit is not required to be arranged on the seat back and directly connected to the connection port of the airbag as in the embodiment, but is arranged on the seat cushion portion of the seat, for example, and the gas supply pipe or the like. The airbag may be configured to supply the expansion gas via the above.

1 ... Seat, 2 ... Seat back, 2a ... Outer edge, 3 ... Backrest, 4 ... Headrest, 6 ... Seat cushion, 6a ... Seat, 20L, 20R ... Inflator (gas supply), 25 ... Airbag, 26c ... trailing edge, 28L, 28R ... gas guide flow path, 28a ... protruding region (expansion part), 32AL, 32AR, 32BL, 32BR, 32CL, 32CR, 32DL, 32DR, 32EL, 32ER ... lateral expansion part (expansion part), 35L, 35R ... Head protection, 36L, 36R ... Shoulder protection, 37L, 37R ... Body protection, 38L, 38R ... Chest protection, 39L, 39R ... Abdomen protection, 40L, 40R ... Lumbar protection , 48L, 48R, 49L, 49R, 50L, 50R, 51L, 51R ... Section, MP ... Crew, MB ... Chest, MA ... Abdomen, MS ... Shoulder, MW ... Lumbar, MH ... Head, S ... Crew protection apparatus.

Claims (6)

It is an occupant protection device for protecting the occupant seated on the seat by wearing a seat belt.
It is configured to include the seat belt and an airbag that is folded and stored in the seat.
The airbag
The expansion gas is allowed to flow into the inside to expand so as to project forward, and when the expansion is completed, the seat belt worn by the occupant is interposed between the occupant and the occupant. It is configured to continuously cover both sides of the left and right side of the waist from both sides of the lumbar region to the crown.
A waist protection portion that extends downward from the seating surface of the seat cushion and restrains the occupant's lumbar region is arranged on the side of the occupant's lumbar region on the lower end side when the expansion is completed. Characterized occupant protection device. The occupant protection device according to claim 1, wherein the airbag is folded and stored on the outer edge side of the seat in which the headrest is integrated. A plurality of expansion portions are arranged side by side on the vertical side by a partition portion in which the airbag is arranged substantially along the front-rear direction when the expansion is completed, and the waist portion to the crown portion on the trailing edge side when the expansion is completed. A claim characterized in that a gas guide flow path connected to a gas supply unit and capable of guiding an expansion gas supplied from the gas supply unit into the expansion unit is provided in a region extending laterally. Item 2. The occupant protection device according to item 1 or 2. When the expansion is completed, the airbag serves as the inflatable portion, the head protection portion that protects the occupant's head, the shoulder protection portion that restrains the occupant's shoulder, and the occupant's chest to abdomen. The body part protection part to be protected and the waist part protection part are arranged side by side in the vertical direction.
The body portion protecting portion is characterized in that it expands by allowing an expansion gas to flow into the inside through any of the head portion protecting portion, the shoulder portion protecting portion, or the lumbar portion protecting portion. The occupant protection device according to claim 3. The body protection part
Upon completion of expansion of the airbag, a chest protection area that is arranged in front of the shoulder protection portion and covers the side of the chest, and a chest protection region.
An abdominal protection area located below the chest protection area and above the lumbar protection area and covering the sides of the abdomen.
Is configured to have
The chest protection region is partitioned from the shoulder protection portion, and the expansion gas is allowed to flow into the inside through the head protection portion to expand the chest protection region.
The occupant protection device according to claim 4, wherein the abdominal protection region is configured to expand by allowing an expansion gas to flow into the inside through the chest protection region. The occupant protection device according to any one of claims 1 to 5, wherein the seat belt is mounted on the seat.

Images