Crew protection devices

Abstract

To provide an occupant protection device which achieves improvement of protection performance of an occupant seated on a seat.SOLUTION: An occupant protection device is provided at a seat 1 having a seating surface part 10 on which a thigh F and a hip B are placed and a backrest 20 which contacts with a back of an occupant. The occupant protection device includes: a side bag 41 which is deployed spanning between the seating surface part and an upper part of the backrest at a side part of the seat; a tensile force bearing part 50 which is provided at the side bag and has tensile strength larger than that of the other part; collision detection parts 101, 200 which detect or predict a collision of a vehicle; and an occupant protection control unit 100 which causes the side bag to deploy and causes the tensile force bearing part to generate the tensile force according to the detection or the prediction of the collision by the collision detection parts.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an occupant protection device for protecting an occupant seated on a seat.

Background Art

[0002] As a technology related to occupant protection in vehicles such as automobiles, for example, Patent Document 1 describes an impact protection device in which a backrest in a seat is prevented from falling backward by a tightening belt extending from above the backrest to the front of the seat cushion during a collision accident. The backrest is held in position based on the tightening belt, and it is described that a protection element positioned laterally of the seat by the tightening belt is also aligned and fixed during a collision accident. Further, it is described that an airbag is provided in a capture net which is a protection element. Patent Document 2 describes that when a rear collision occurs, an inner buckle of a seat belt is pulled in, and by generating tension in both the shoulder belt and the lap belt of the seat belt, the upward slipping behavior of an occupant during a rear collision with a relatively high relative speed is suppressed. Patent Document 3 describes an occupant protection device in which an annular airbag is deployed so as to surround an occupant in an inverted V shape, connecting from behind the occupant's head, passing through in front of the shoulders and laterally of the thighs, and connecting the lower parts of the lower limbs.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a rear-end collision, where the vehicle is struck from the rear of the occupants, the occupants are pressed firmly against the seat backrest. If the collision energy is high, the occupants will try to push the seat backrest even further. However, there is a structural limit to how far the backrest can be pushed backward. Once this limit is reached, the backrest tilts backward, causing the occupant to slide upward and diagonally backward along the slope of the backrest. This upward sliding motion can cause the occupant's head and neck to detach from the headrest, a safety device designed to mitigate occupant injury during a rear-end collision. There are concerns that if the occupant's head and neck detach from the headrest, injuries to the neck and brainstem may worsen. In view of the above-mentioned problems, the object of the present invention is to provide an occupant protection device that improves the protective performance of occupants seated in a seat. [Means for solving the problem]

[0005] To solve the above-mentioned problems, an occupant protection device according to one aspect of the present invention is an occupant protection device provided on a seat having a seat surface on which the occupant's thighs and buttocks rest, and a backrest that extends upward from the rear of the seat surface and contacts the occupant's back, comprising: a side bag that extends between the seat surface and the upper part of the backrest on the side of the seat; a tension bearing part provided on the side bag that connects the seat surface and the upper part of the backrest and has greater tensile strength than other parts of the side bag; a collision detection unit that detects or predicts a collision of a vehicle; and an occupant protection control unit that deploys the side bag and generates tension in the tension bearing part in response to the detection or prediction of the collision by the collision detection unit. The side bag is formed in a cylindrical shape, and the tension bearing portion has a tether that extends along the longitudinal direction of the side bag and is joined to the side bag. It is characterized by the following: According to this, the tension bearing portion provided on the side bag that extends between the seat and the upper part of the backrest restrains the rotation of the backrest in the backward tilting direction. Therefore, in the event of a rear collision where the occupant is hit from behind, the backrest does not tilt backward, and the behavior of the occupant sliding upward along the slope of the backrest is suppressed. Therefore, injuries to the neck and brainstem caused by the occupant's head and neck detaching from the headrest can be suppressed. Furthermore, even in a frontal collision where the occupants are struck from the front, the side bags absorb the collision energy while suppressing the forward movement of the occupants' upper bodies, thereby reducing occupant injury. Furthermore, even in side collisions where the occupant is struck from the side, the side bags absorb energy while simultaneously pushing and moving the occupant toward the opposite side of the impact, thereby mitigating occupant injury. According to this, the tension-bearing section can be made into a simple and reliable structure.

[0007] In the present invention, the side bag can be configured to include a traction unit that pulls the side bag and the tension bearing unit when the side bag is deployed. According to this method, tension can be reliably generated in the tension-bearing section, thereby appropriately obtaining the effects described above.

[0008] In the present invention, the side bags are provided on the left and right sides of the occupant, and the vehicle can be configured to include an upper bag that extends over the upper parts of the left and right side bags and is positioned behind the occupant's neck. According to this design, the occupant's neck can be restrained during a rear-end collision, reducing neck and head injuries, and more effectively preventing the occupant from sliding upward along the slope of the backrest.

[0009] In the present invention, the collision detection unit can be configured to determine whether or not the collision is a side collision, and if it is determined to be a side collision, it can be configured to include a connection point moving unit that positions the connection point of the side bag to the seat portion on the rearward side compared to the case of collisions other than side collisions. According to this, in the event of a rear-end collision, positioning the connection point of the side bag to the seat surface further forward than in the case of a side-end collision (typically near the front edge of the seat surface) can enhance the effect of restraining the backward tilt of the backrest. Furthermore, in the event of a frontal collision, by positioning the connection point of the side bags to the seat further forward than in the case of a side collision, the side bags can more easily move over the occupant's shoulders and restrain the front of the upper body, thereby enhancing the effect of suppressing the occupant's forward movement. On the other hand, in the event of a side collision, by positioning the connection point of the side bag to the seat towards the rear compared to a rear collision or front collision, the side bag can be deployed along the side of the occupant's body, thereby improving occupant protection performance during a side collision. Furthermore, in the present invention, the occupant protection device further comprises a lower bag extending along the shoulder width direction of the occupant at the lower part near the front edge of the seat, and the tether can be provided continuously from one of the side bags to the lower bag and the other side bag. . [Effects of the Invention]

[0010] As described above, the present invention provides an occupant protection device that improves the protective performance of occupants seated in a seat. [Brief explanation of the drawing]

[0011] [Figure 1] This is a schematic diagram showing a vehicle seat equipped with a first embodiment of the occupant protection device to which the present invention is applied, viewed from the side, and illustrating the state after the annular airbag has been deployed. [Figure 2] This is a view of section II-II in Figure 1. [Figure 3] This is a view from the line III-III in Figure 1. [Figure 4] This is a cross-sectional view of the side airbag in the occupant protection device of the first embodiment (cross-sectional view taken along the arrow IV-IV in Figure 1). [Figure 5] This is a schematic block diagram showing the system configuration of the occupant protection device of the first embodiment. [Figure 6] This is a schematic diagram showing a vehicle seat equipped with a second embodiment of the occupant protection device to which the present invention is applied, viewed from the side, and illustrating the state after the annular airbag has been deployed.

Best Mode for Carrying Out the Invention

[0012] <First Embodiment> Hereinafter, a first embodiment of an occupant protection device to which the present invention is applied will be described. The occupant protection device according to the first embodiment is provided on a seat provided in a vehicle interior of an automobile such as a passenger car, and protects an occupant sitting on the seat during a collision. FIG. 1 is a schematic view showing a state of a vehicle seat provided with the occupant protection device according to the first embodiment as viewed from the side, and shows a state after the annular airbag is deployed. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 1.

[0013] As shown in FIG. 1, the occupant P has a head H, a neck N, an upper body UB, arms A, legs L, thighs F, a buttocks B, and the like. As an example, the occupant P is assumed to be sitting facing the front side of the vehicle. The seat 1 has a seat cushion 10, a backrest 20, a headrest 30, and the like.

[0014] The seat cushion 10 is a seating surface on which the buttocks B and thighs F of the occupant P are placed. The seat cushion 10 is attached to a floor panel (not shown) that constitutes the floor surface of the vehicle interior via a base portion (not shown). The base portion has a seat rail or the like that supports the seat 1 so as to be slidable in the front-rear direction with respect to the vehicle body. The seat cushion 10 has an upper surface portion that extends along the front-rear direction and the shoulder width direction of the occupant P. The lower limb portion of the legs L of the occupant P is in a state of being thrown forward from the front end portion of the seat cushion 10.

[0015] The backrest (seat back) 20 is a backrest portion provided to face the back of the upper body UB of the occupant P. The backrest 20 protrudes upward and diagonally backward from near the rear end of the seat cushion 10. The upper end of the backrest 20 is positioned behind the shoulders of the occupant P during normal use of the vehicle.

[0016] The headrest 30 is located behind the head H of the occupant P and is the part that restrains the head H when the head H rotates in a backward direction relative to the seat 1. The headrest 30 is provided projecting upward from the upper end of the backrest 20. The seat cushion 10, backrest 20, and headrest 30 are each constructed to have shock absorption (cushioning) properties by providing an elastic material, such as porous urethane foam, around a frame made of a metal material such as steel.

[0017] Furthermore, the seat 1 has an annular airbag 40, a tether 50, a deployment device 60, etc., which work in cooperation with the airbag control unit 100, etc., described later, to constitute the occupant protection device of the first embodiment.

[0018] The annular airbag 40 is a bag-like body that deploys when deployment gas is introduced in response to the detection or prediction of a collision. The annular airbag 40 includes, for example, side airbags 41, an upper airbag 42, a lower airbag 43, etc., which are formed by sewing a base fabric panel made of a nylon fiber woven fabric into a tubular shape. The annular airbag 40 is configured to form an annular shape when viewed from the front side of the occupant P (typically the front side of the vehicle), as shown in Figure 2, by sequentially connecting these side airbags (side bags) 41, upper airbag (upper bag) 42, and lower airbag (lower bag) 43. Although the annular airbag 40, etc., is actually deployed by a deployment gas generated by a chemical-type gas generator, it will be explained using the general term "airbag."

[0019] One end (lower end and front end) of the side airbag 41 is connected to the side end of the lower airbag 43 near the front end on the side of the seat cushion 10. The other end (upper end and rear end) of the side airbag 41 is connected to the side end of the upper airbag 42 near the upper end of the side of the backrest 20. As shown in Figure 1, the side airbag 41 is positioned to overlap with the shoulder (upper part of the upper body UB), arm A, and thigh F of the occupant P when viewed from the width direction of the occupant P (typically the width direction of the vehicle when the occupant is seated facing forward). As shown in Figure 2, the upper part of the side airbag 41 is positioned so as to overlap with the shoulder of the occupant P when viewed from the front of the occupant P. As shown in Figure 3, the upper part of the side airbag 41 is positioned so as to overlap with the shoulder of the occupant P when viewed from above.

[0020] The upper airbag 42 extends along the upper edge of the backrest 20 in the direction of the occupant P's shoulder width. Both ends of the upper airbag 42 are connected to the upper ends (rear ends) of the left and right side airbags 41 so that the deployment gas can communicate with them. The upper end of the side airbag 41 is restrained by the upper airbag 42. The upper airbag 42 is positioned behind the neck N of the occupant P. For example, in a rear collision where the vehicle hits the occupant P from behind, when the occupant P's upper body UB, head H, etc. move backward while pushing against the backrest 20, the airbag 42 comes into contact with the neck N to absorb the impact and also restrains the neck N so that it is less likely to move vertically.

[0021] The lower airbag 43 extends along the shoulder width direction of the occupant P at the lower part near the front edge of the seat cushion 10. Both ends of the lower airbag 43 are connected to the lower ends (front ends) of the left and right side airbags 41 so that the deployment gas can communicate with them. The lower airbag 43 is restrained in the longitudinal direction near the front end of the seat cushion 10. The lower end of the side airbag 41 is restrained by the lower airbag 43.

[0022] The tether 50 is provided on the side airbag 41, etc., and connects the seat cushion 10 and the upper part of the backrest 20, and is a tension bearing part that bears the tension when the side airbag 40 is subjected to tensile force. Tether 50 is made up of a strip of webbing, for example, made of a woven polyester fiber. The tether 50 is positioned along the longitudinal direction on the outer circumferential surface of the side airbags 41 and lower airbag 43 that constitute the annular airbag 40, and is fixed by means of, for example, sutures or adhesive. Tether 50 has higher tensile strength and smaller elongation deformation under tensile force compared to the side airbag 41. As shown in Figure 2, the tether 50 is continuously provided from one side airbag 41 to the lower airbag 43, and then to the other side airbag 41. The end 51 of the tether 50 is connected to a bobbin (not shown) that is built into the unfolding device 60, with the tether wound around it.

[0023] Figure 4 is a cross-sectional view of the side airbag in the occupant protection device of the first embodiment (cross-sectional view taken along the line IV-IV in Figure 1). The side airbag 41 is constructed, for example, by sewing together a pair of strip-shaped base fabric panels P1 and P2 at their side ends with thread S1. The side airbag 41 deploys into a cylindrical shape when deployment gas is introduced. The tether 50 is attached, for example, to the center of one of the base fabric panels P1 in the width direction. Both ends of the tether 50 in the width direction are sewn to the base fabric panel P1 with thread S2.

[0024] The annular airbag 40 and tether 50 are folded along the sides of the seat cushion 10 and backrest 20 and housed inside the seat upholstery (not shown) during normal use of the vehicle (non-collision). The annular airbag 40 and tether 50 deploy in the event of a collision by partially rupturing the seat upholstery. The seat surface is provided with a weak point that will rupture when the annular airbag 40 and tether 50 are deployed.

[0025] The deployment device 60 deploys the annular airbag 40 and pulls the tether 50 to generate tension in the tether 50 in response to the detection of a vehicle collision (establishment of collision judgment) or the prediction of a collision (establishment of pre-crash judgment). The deployment device 60 can be configured, for example, to be built into the upper part of the backrest 20. The deployment device 60 has a traction mechanism for pulling the tether 50. The unfolding device 60 has a rotatable bobbin (not shown), and the end of the tether 50 is wound around the bobbin. For the mechanism to tow the Tether 50, for example, a configuration similar to that of a chemical-type seat belt pretensioner can be applied. The deployment device 60 is equipped with a gas generator 130 for the annular airbag, which will be described later, for towing the tether 50 and deploying the annular airbag 40.

[0026] Figure 5 is a block diagram schematically showing the system configuration of the occupant protection device of the first embodiment. The vehicle of the first embodiment has an airbag control unit 100 and an environment recognition unit 200. The airbag control unit 100 controls the deployment of various airbags installed in the vehicle and the towing of the tether 50 in response to the detection of a vehicle collision or a precursor to a collision. The environmental recognition unit 200 recognizes the environment around the vehicle based on the outputs of various sensors. The airbag control unit 100 and the environment recognition unit 200 are configured to include, for example, an information processing unit such as a CPU, a storage unit such as RAM or ROM, an input / output interface, and a bus connecting these. The airbag control unit 100 and the environmental recognition unit 200 can communicate with each other, for example, via an in-vehicle LAN such as a CAN communication system, or directly.

[0027] The airbag control unit 100 is an occupant protection control unit that controls the operation of each gas generator provided in the occupant protection device in response to the detection or prediction of a collision. The airbag control unit 100 has a collision sensor 101. The collision sensor 101 is a collision detection unit that has an acceleration sensor that detects acceleration acting on the vehicle body in the longitudinal direction, vehicle width direction, etc. When the collision sensor 101 detects a significant acceleration characteristic of a collision, the airbag control unit 100 establishes a collision determination (detects a collision), determines the type of collision, and decides to deploy the corresponding airbag. Collision types include, for example, frontal collisions where the vehicle is hit from the front, rear collisions where the vehicle is hit from the rear (typically a rear-end collision), and side collisions where the vehicle is hit from the side. These collision patterns can be determined based on the direction of the main acceleration detected by the collision sensor 101.

[0028] The airbag control unit 100 has the function of issuing operation commands to the front collision airbag gas generator 110, the curtain airbag gas generator 120, and the annular airbag gas generator 130, and starting the generation of deployment gas. Each gas generator (inflator) generates a deployment gas using, for example, explosives. The front collision airbag gas generator 110 supplies deployment gas to, for example, the driver's airbag that deploys from the center pad of the steering wheel, the passenger-side airbag that deploys from the front of the instrument panel, and so on. The curtain airbag gas generator 120 supplies deployment gas to the curtain airbag, which deploys along the side door glass, from the top of the side door glass in the passenger compartment.

[0029] The annular airbag gas generator 130 is installed in the deployment device 60 described above and supplies deployment gas to the annular airbag 40 via a gas supply channel (not shown). Furthermore, a portion of the deployment gas generated by the annular airbag gas generator 130 is used as power to rotate the bobbin around which the end of the tether 50 is wound.

[0030] The environmental recognition unit 200 is connected to a visible light camera device 210, a millimeter-wave radar device 220, a laser scanner device 230, and the like. The visible light camera device 210 is an imaging device that captures images of the area around the vehicle (front, rear, sides, etc.) using visible light cameras such as stereo cameras and single-lens cameras. The visible light camera device 210 has the function of performing image processing on the captured image to detect the presence or absence of objects around the vehicle, the relative position and speed of objects with respect to the vehicle, and the shape of the lane, etc. The millimeter-wave radar system 220 is a radar system that uses radio waves in a frequency band of, for example, 30 to 300 GHz, and has the function of detecting the presence or absence of an object and the relative position of the object with respect to the vehicle. The laser scanner device 230 has a function to scan the area around the vehicle by, for example, irradiating it with pulsed near-infrared laser light, and to detect the presence or absence of an object, the relative position of the object to the vehicle, the shape of the object, etc., based on the presence or absence of reflected light and the time difference until the reflected light returns. The environmental recognition unit 200, based on the outputs of these sensors, establishes a pre-crash determination (collision prediction) when, for example, a collision with an object such as another vehicle is unavoidable. If a pre-collision detection is successful, the environmental recognition unit 200 determines the type of collision (front collision, rear collision, side collision, etc.) based on the output of each sensor. The environmental recognition unit 200 functions as another collision detection unit of the present invention.

[0031] When the airbag control unit 100 determines that a collision has occurred based on the output of the collision sensor 101, or when the environmental recognition unit 200 determines that a pre-crash has occurred, it issues an operation command to the annular airbag gas generator 130 and starts generating the deployment gas. As a result, the deployment device 60 deploys the annular airbag 40 and begins to pull (wind up) the tether 50.

[0032] According to the first embodiment described above, the following effects can be obtained. (1) The tether 50 provided on the side airbag 41, which is deployed between the seat cushion 10 and the upper part of the backrest 20, restrains the rotation of the backrest 20 in the direction of backward tilting. Therefore, in the event of a rear collision in which the occupant P is hit from the rear, the backrest 20 will tilt backward, and the behavior of the occupant P sliding up along the inclination of the backrest 20 will be suppressed. Therefore, injuries to the neck and brainstem caused by the occupant P's head H and neck N detaching from the headrest 30 can be suppressed. Furthermore, even in the event of a frontal collision in which the occupant P is struck from the front, the side airbags 41 suppress the forward movement of the occupant P's upper body UB while absorbing the collision energy, thereby reducing injuries to the occupant P. Furthermore, even in the case of a side collision where the occupant P is hit from the side, the side airbag 41 absorbs energy and pushes and moves the occupant P to the opposite side of the collision, thereby suppressing injury to the occupant P. (2) By joining a strip-shaped tether 50 along the longitudinal direction of the cylindrical side airbag 41, the above-mentioned effects can be obtained with a simple and reliable configuration. (3) Although tension can be generated in the tether 50 simply by deploying the annular airbag 40, the deployment device 60 has a traction mechanism that pulls the tether 50 when the annular airbag 40, including the side airbags 41, is deployed, thereby ensuring that tension is generated in the tether 50 and the above-mentioned effects can be appropriately obtained. (4) By providing an upper airbag 42 that is installed over the left and right side airbags 41 and positioned behind the neck N of the occupant P, the neck N of the occupant P can be restrained in the event of a rear collision, thereby suppressing injuries to the neck N and brainstem, and more effectively preventing the occupant P from sliding up along the slope of the backrest 20.

[0033] <Second Embodiment> Next, a second embodiment of an occupant protection device to which the present invention is applied will be described. In the second embodiment, the same reference numerals are used for parts similar to those in the first embodiment, and their descriptions are omitted. The differences will be described primarily. Figure 6 is a schematic diagram showing a vehicle seat equipped with the occupant protection device of the second embodiment, viewed from the side, and depicts the state after the annular airbag has been deployed.

[0034] The occupant protection device of the second embodiment has a deployment device 70, which will be described below, instead of the deployment device 60 of the first embodiment. The unfolding device 70 is provided, for example, at the bottom of the seat cushion 10. The deployment device 70 includes a gas generator 130 for the annular airbag and a towing mechanism for towing the tether 50, as well as a slide mechanism 71, which will be described below. The sliding mechanism 71 restrains the lower end of the side airbag 41, which is the lower part of the annular airbag 40, and the lower airbag 43, against the seat cushion 10, and displaces the restraint point (the connection point of the side airbag 41 to the seat cushion 10) in the longitudinal direction of the vehicle.

[0035] The sliding mechanism 71 has a drive device that, in response to a command from the airbag control unit 100, drives the base to which the lower airbag 43 is attached in the front-rear direction of the seat cushion 10, for example, using an electric actuator or a chemical actuator. The sliding mechanism 71 functions as a connection point moving part of the present invention, displacing the connection point between the side airbag 41 and the seat cushion 10 in the front-rear direction.

[0036] In Figure 6, the side airbags 41 and lower airbags 43, shown by dashed lines, represent the state during a side collision. The tether 50 in this state is not shown in the illustration. Furthermore, the side airbags 41 and lower airbags 43, shown with solid lines, represent their states during a frontal collision and a rear-end collision. During normal use of the vehicle (non-collision), the sliding mechanism 71 holds the lower end of the side airbag 41 and the lower airbag 43 near the middle of the seat cushion 10 in the front-rear direction (initial position).

[0037] When the annular airbag 40 is deployed in response to the detection or prediction of a frontal or rear collision, the sliding mechanism 71 moves the lower end of the side airbag 41 (the connection point with the seat cushion 10) and the lower airbag 43 forward of the vehicle relative to their initial positions. At this time, the annular airbag 40 deploys in the manner shown by the solid line in Figure 6 (same manner as in the first embodiment).

[0038] On the other hand, if the annular airbag 40 is deployed in response to the detection or prediction of a side collision, the sliding mechanism 71 maintains the lower end of the side airbag 41 and the lower airbag 43 in their initial positions. At this time, the annular airbag 40 deploys in the manner shown by the dashed line in Figure 6.

[0039] According to the second embodiment described above, in addition to the same effects as those of the first embodiment described above, in the event of a rear collision, the connection point of the side airbag 41 to the seat cushion 10 is positioned further forward than in the case of a side collision (typically near the front end of the seat surface), thereby enhancing the effect of restraining the rearward tilt of the backrest 20. Furthermore, in the event of a frontal collision, by positioning the connection point of the side airbag 41 to the seat cushion 10 further forward than in the case of a side collision, the side airbag 41 can more easily move over the shoulder of the occupant P and restrain the front of the upper body UB, thereby enhancing the effect of suppressing the forward movement of the occupant P. On the other hand, in the event of a side collision, by positioning the connection point of the side airbag 41 to the seat cushion 10 further back than in a rear collision or front collision, the side airbag 41 can be deployed along the side of the occupant P's body, thereby improving occupant protection performance during a side collision.

[0040] (modified version) The present invention is not limited to the embodiments described above, and various modifications and changes are possible, all of which fall within the technical scope of the present invention. (1) The occupant protection devices, seats, and vehicle configuration are not limited to the embodiments described above and can be modified as appropriate. (2) The collision detection or prediction method and the hardware configuration used in the embodiment are examples and can be modified as appropriate. For example, the types of sensors installed on the vehicle are not limited to the embodiment and can be added or omitted as appropriate. Furthermore, collision prediction may not be limited to detection and prediction using sensors mounted on the vehicle itself, but may also be predicted using, for example, vehicle-to-infrastructure communication or vehicle-to-vehicle communication. (3) The configuration of the tension bearing portion provided in the side airbag (side bag) is not limited to a configuration in which a tether made of a separate component is attached to the surface of the base fabric constituting the side bag, as in each embodiment, and can be changed as appropriate. For example, the tether may form part of the side bag. Alternatively, reinforcing members such as tubes made of aramid fibers, such as Kevlar®, may be provided around the base fabric that makes up the bag. (4) In the second embodiment, the connection point between the side bag and the seat is configured to move forward relative to the position (initial position) during a frontal collision and a rear collision. However, the embodiment is not limited to this, and the connection point may be configured to move backward relative to the position (initial position) during a side collision. (5) In each embodiment, the deployment of the annular airbag having side airbags and the pulling of the tether (tensioning part) are performed using the same gas generator, but the pulling of the tether and the like may be performed using a power source separate from the deployment of the bag. [Explanation of symbols]

[0041] 1 seat, 10 seat cushions 20 Backrest 30 Headrest 40. Annular airbag 41. Side airbag 42 Upper airbag 43 Lower airbag P1, P2 base fabric panel S1, S2 yarn 50 Tethers 60 Deployment Devices 70 Unfolding device 71 Sliding mechanism 100 Airbag control unit 101 Collision sensor 110 Front collision airbag gas generator 120 Gas generator for curtain airbags 130 Gas generator for annular airbags 140 Tether gas generator 200 Environmental recognition unit 210 Visible light camera device 220 Millimeter-wave radar equipment 230 Laser scanner equipment P Occupant H Head N Neck UB Upper body A arm L leg F Thigh B Buttocks D Side Door

Claims

1. An occupant protection device provided on a seat having a seat surface on which the occupant's thighs and buttocks rest, and a backrest that extends upward from the rear of the seat surface and contacts the occupant's back, A side bag extends across the side of the seat, between the seat surface and the upper part of the backrest, The side bag is provided with a tension-bearing portion that has greater tensile strength than other parts of the side bag, connecting the seat portion and the upper part of the backrest, A collision detection unit that detects or predicts vehicle collisions, In response to the collision detection or prediction by the collision detection unit, the occupant protection control unit deploys the side bags and generates tension in the tension bearing unit, Equipped with, The aforementioned side bag is formed in a cylindrical shape, The tension-bearing portion has a tether that extends along the longitudinal direction of the side bag and is joined to the side bag. A crew protection device characterized by the following features.

2. The side bag is provided with a traction mechanism for pulling the side bag and the tension bearing mechanism when the side bag is deployed. The occupant protection device according to claim 1, characterized by the following:

3. The aforementioned side bags are provided on the left and right sides of the occupant. The vehicle is provided with an upper bag that extends over the upper parts of the left and right side bags and is positioned behind the occupant's neck. The occupant protection device according to claim 1, characterized by the following:

4. The collision detection unit determines whether the collision is a side collision or not. If a side collision is detected, the connection point of the side bag to the seat portion is provided with a connection point repositioning mechanism that positions the connection point to the rearward side compared to collisions other than side collisions. The occupant protection device according to claim 1, characterized by the following:

5. The lower part of the seat near the front edge further comprises a lower bag extending along the shoulder width direction of the occupant, The tether is provided continuously from one of the side bags to the lower bag and then to the other side bag. The occupant protection device according to claim 1, characterized by the following:

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