JP4923524B2 - Occupant protection device and occupant protection method during vehicle rollover - Google Patents

Description

  The present invention relates to an occupant protection device and an occupant protection method when a vehicle rolls over.

As a passenger protection device when the vehicle rolls over, an airbag bag body is arranged outside the passenger compartment on the passenger's head, and when the rollover is detected, the airbag bag body is inflated to detect the passenger's head. Has been proposed (see, for example, Patent Document 1).
JP 2000-142303 A (page 5-6, FIG. 2)

  When the vehicle rolls over, the top and bottom of the vehicle may be substantially reversed and contact the ground from the roof. When the top and bottom are reversed, the passenger's head may interfere with the ceiling. However, in the protective device shown in Patent Document 1, it is possible to prevent the occupant's head from moving sideways by the airbag bag body, but it is not possible to actively prevent the head from interfering with the ceiling. .

  Therefore, the present invention provides an occupant protection device and a occupant protection method during vehicle rollover that can increase the occupant's head space positively at the time of vehicle rollover and further enhance the head protection effect. is there.

The present invention relates to a seat having a seat cushion and a seat back, a vehicle rollover detecting means for detecting a rollover state of the vehicle, a seatback tilting means for allowing a predetermined amount of backward tilt of the seatback, and an occupant by inflating. an air bag for pressing the upper body to the seat back direction, from the detection signal of the vehicle rollover detection means determines rollover, only setting the control means, the operating the seatback foldable means and said air bag, roll When the over is detected, the seat back is allowed to tilt backward, the airbag is inflated and the occupant is pressed, and the occupant is tilted backward by a predetermined amount while being restrained by the seat. It is the the most important feature that.

  According to the present invention, when rollover is detected and the seat back tilting means is activated, the seat back is allowed to tilt backward, and when the airbag is activated and inflated, the upper body of the occupant is lifted. Since the occupant is pressed in the seat back direction, the seat back is tilted backward by a predetermined amount while being restrained by the airbag. Then, the head of the occupant moves rearward about the center of rotation of the seat back, and the space between the head of the occupant and the ceiling in the passenger compartment is increased, so the head interferes with the ceiling. Can be efficiently suppressed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 to 17 show a first embodiment of an occupant protection device when a vehicle rolls over according to the present invention, FIG. 1 is a perspective view of a seat to which the occupant protection device is applied, and FIG. 2 is an enlarged perspective view of a portion A in FIG. 3 is an enlarged perspective view of a portion B in FIG. 1, FIG. 4 is an enlarged perspective view of a portion C in FIG. 1, FIG. 5 is a perspective view taken along line DD in FIG. 3, and FIG. FIG. 7 is a perspective view of the seat showing an operating state of the occupant protection device, and FIG. 8 is an enlarged perspective view of a portion F in FIG. 7.

  9 is a rear view showing the internal structure of the seat, FIG. 10 is an exploded perspective view showing the internal structure of the lower part of the seat back in detail, and FIG. 11 is a rear view showing the internal structure of the lower part of the seat as a cross section of the main part. FIG. 13 is a front view showing the detailed structure of the seatback rearward tilt limiting means, FIG. 13 is a front view showing the rollover state of the vehicle due to rollover in order (a) to (c), and FIG. 14 is the operating state of the occupant protection device FIG. 15 is a side view of the seat showing the steps in order in (a), (b), and (c), FIG. 15 is an explanatory diagram of a flowchart for controlling the occupant protection device, and FIG. 16 is a map showing an example of rollover determination. FIG. 17 is a perspective view showing an operation image of the occupant protection device in order of (a) and (b).

  The occupant protection device 10 at the time of a vehicle rollover of the present embodiment is applied to a vehicle seat 1 having a seat cushion 2 and a seat back 3 as shown in FIG. 1, and when the vehicle rolls over due to a rollover of the vehicle. The vehicle rollover detecting means 11 for detecting the rollover state of the vehicle, the seatback retractable means 12 for allowing the seatback 3 to tilt backward by a predetermined amount, and the occupant C by expansion are designed to protect the occupant C. (See FIG. 14) The airbag 13 that presses the upper body Cu in the direction of the seat back 3 and the rollover is determined from the detection signal of the vehicle rollover detection means 11, and the seat back tilting means 12 and the airbag 13 are And a control box 14 as a control means to be operated.

  In addition, according to the occupant protection method when the vehicle rolls over according to the present embodiment, when the vehicle rollover is detected, the seat back tilting means 12 that allows the seat back 3 to tilt backward by a predetermined amount, and the occupant C by expansion. The airbag 13 that presses the upper body Cu in the direction of the seat back 3 is operated, and the seat back 3 is tilted backward by a predetermined amount together with the occupant C by the pressing force when the airbag 13 is inflated.

  The seat back 3 is provided with a headrest 4 at an upper end portion thereof, and a reclining function in which a lower end portion is rotatably attached to a rear end portion of the seat cushion 2 and can be tilted back and forth.

  As shown in FIG. 17, the seat 1 is routed from the shoulder Cs on one side of the occupant C to the waist Cw on the opposite side via the chest Cc to restrain the upper body Cu to the seat back 3. A seat belt device 20 having a belt 21 and a lap belt 22 arranged on both sides of the waist Cw of the occupant C and restraining the lower body Cl to the seat cushion 2, and the airbag 13 is connected to the shoulder Along the belt 21, it is formed in an elongated bag shape extending from the shoulder Cs on one side of the occupant C to the vicinity of the waist Cw on the opposite side.

  The shoulder belt 21 and the lap belt 22 are continuous, and a tongue 23 movably inserted between the shoulder belt 21 and the lap belt 22 is detachably attached to the inner buckle 24.

  The webbing 25 extending from the upper end of the shoulder belt 21 is taken into the seatback 3 through the webbing insertion opening 26 provided at the upper end of the seatback 3, and the taken webbing 25 is built into the seatback 3. The main retractor 27 as a webbing take-up device is taken up.

  The main retractor 27 is configured as an electric retractor driven by a motor (not shown), and a pretensioner function and a load limiter function are added to the main retractor 27. The end of the lap belt 22 opposite to the side on which the tongue 23 is attached is coupled to the lower part of the seat cushion 2.

  As shown in FIGS. 2 to 4, the airbag 13 is formed with cuts 13 a at appropriate intervals in the lengthwise direction, and is inserted through the cuts 13 a so as to sew a shoulder belt 21. 21 is attached.

  As shown in FIG. 5, the airbag 13 is formed by covering the outer side with an airbag cover 13c in a state in which a bag body 13b continuous in the length direction is folded, and the airbag cover 13c is formed by the bag body 13b. It breaks when it expands. Further, the bag 13b is branched into both side portions of the airbag 13 as shown in FIG.

  As shown in FIG. 4, the lower end portion of the airbag 13 communicates with an inflator 28 provided on the inner buckle 24 via a tube 28a. The inflator 28 is operated by a signal output from the control box 14 to gas. The gas is supplied to the airbag 13 to inflate the bag body 13b.

  In addition, when the airbag 13 is inflated as shown in FIG. 7, the upper end portion disposed in the vicinity of the webbing insertion opening 26 as shown in FIG. 8 has a portion corresponding to the shoulder Cs of the occupant C. An enlarged portion 13d is formed.

  9, the headrest frame 4a of the headrest 4 is attached to the upper end side of the inverted U-shaped seatback frame 3a as shown in FIG. 9, and the seatback spring 3b and the reinforcement are provided between the upper and lower central portions of the left and right sides. A frame 3c is provided, and a lower end portion of the seat back frame 3a is provided with a main shaft 100 as a rotation shaft that becomes a tilting center of the seat back 3, and the main shaft 100 is a seat cushion frame 2a of the seat cushion 2. Connected to the rear end of the vehicle.

  Shaft guides 101 and 102 for fixing the tilt position of the seat back 3 are provided at both ends of the main shaft 100, and the tilt position in the front-rear direction of the seat back 3 is arbitrarily set at one end of the main shaft 100. A seat back recliner 103 is provided.

  As for the detailed lower structure of the seat 1, the lower end of the seat back frame 3a is attached to a seat slider 110 as shown in FIGS.

  The seat slider 110 includes a pair of slide rails 111 that extend in the vehicle front-rear direction and are fixed to the floor panel and arranged in the vehicle width direction, and a slider 112 that is movably disposed in the front-rear direction on the slide rail 111. A plate 114 is coupled to each slider 112 via a pin 113, and a lower end portion of the seat back frame 3a is rotatably connected to the plate 114. Further, a connecting frame 121 is erected between the sliders 112 inside and outside in the vehicle width direction and reinforced.

  A bossed hole 115 protrudes from the inner side of the vehicle width direction (right side in the figure) 115 on the inner side of the seat, and the bossed hole 115 rotates to a support hole 116 formed at the lower end of the seat back frame 3a. On the other hand, a boss portion 115a is projected on the inner side of the seat on the plate 114 on the outer side in the vehicle width direction (left side in the figure), and the boss portion 115a is formed at the lower end of the seat back frame 3a. The support hole 116 is rotatably fitted.

  The disc-shaped seat back recliner 103 and the disc-shaped shaft guide 101 are arranged in that order inside the lower end portion of the seat back frame 3a on the inner side in the vehicle width direction (right side in the figure), A disc-shaped shaft guide 102 is disposed on the inner side of the lower end of the seat back frame 3a outside in the vehicle width direction (left side in the figure), and the main holes 101a and 102a of the shaft guides 101 and 102 have the main holes 101a and 102a, respectively. Small diameter support portions 100a and 100b formed at both ends of the shaft 100 are rotatably fitted. At this time, the shaft guides 101 and 102 are respectively coupled to the seat back frame 3a by pins 117.

  The peripheral edge of the center hole 101a of the shaft guide 101, the peripheral edge of the central hole 103a of the seat back recliner 103, and the peripheral edge of the support hole 116 of the seat back frame 3a are respectively vertically engaged with the engagement holes 101b. , 103b, 116b are formed.

  A spiral spring 118 is disposed between the seat back frame 3a and the inner and outer plates 114 in the vehicle width direction to turn and urge the seat back frame 3a in the return direction. The end portion is locked to the bossed hole 115 and the locking protrusion 119 protruding from the side surface opposite to the boss portion 115a, and the outer peripheral end portion of the spiral spring 118 protrudes from the side surface of the seat back frame 3a. It is locked by the provided locking protrusion 120.

  The seat back 3 is connected to the seat cushion 2 via a reclining device 60 that arbitrarily sets the tilting position in the front-rear direction.

  That is, the recliner movable lever 123 is disposed outside the plate 114 on the side where the seat back recliner 103 is disposed, and the reclining device 60 is configured by the seat back recliner 103 and the recliner movable lever 123.

  The recliner movable lever 123 is attached to the plate 114 via a pin 124 inserted through an elongated hole 123a provided in an intermediate portion, and the end 123c opposite to the operation portion 123b is inserted through the bossed hole 115 to provide a seat. The back recliner 103 is engaged with the center hole 103a.

  The seat back tilting means 12 uses a main shaft 100 as a rotating shaft of the reclining device 60, locks the seat back frame 3a tilting around the main shaft 100 detachably, and detects rollover. And a solenoid 104 as locking means for releasing the lock, and a seatback rearward tilt limiting means 105 for limiting the amount of rotation of the seatback frame 3a with respect to the main shaft 100.

  The solenoid 104 is provided at one end of the main shaft 100 where the seatback recliner 103 is provided, and an operation pin 104a that protrudes and retracts in response to a command signal from the control box 14 includes the shaft guide 101, the seatback recliner 103, and the seatback frame 3a. Are inserted into the respective engagement holes 101b, 103b, 116b. In this case, a pair of solenoids 104 are provided at two locations on the upper and lower sides of the main shaft 100.

  That is, during normal operation, the operating pin 104a is in a protruding state and passes through the engagement holes 101b, 103b, 116b, thereby locking the tilt of the seat back frame 3a, while the operating pin 104a is retracted during rollover. Then, the engagement between the shaft guide 101 and the seat back recliner 103 is released, the seat back frame 3a is unlocked, and the seat back 3 can be tilted backward.

  Further, as shown in FIG. 12, the seatback rearward tilt limiting means 105 is formed at a fitting portion between the center hole 101a of the shaft guide 101 and the small-diameter support portion 100a of the main shaft 100, and the inner periphery of the center hole 101a. The engaging projection 106 provided on the outer periphery of the small-diameter support portion 100a and a retractable locking claw 107 provided on the outer periphery of the small-diameter support portion 100a. It arrange | positions in the space S formed between 101a and the small diameter support part 100a.

  The engaging protrusion 106 protrudes in a substantially triangular shape that forms a gentle inclined surface 106a in the forward tilt direction of the seat back frame 3a and a vertical locking surface 106b in the reverse backward direction. The pawl 107 is attached to the outer periphery of the small-diameter support portion 100a so as to be protruded and retracted, and is smoothly accommodated in the inclined surface 106a while being housed in the small-diameter support portion 100a in the forward tilt direction of the seat back frame 3a. In addition, the seat back 3 is locked to the locking surface 106b in the backward tilt direction of the seat back frame 3a to lock the seat back 3.

  A webbing guide 29 extends upward from the attachment portion of the main retractor 27 to the seat back frame 3a. The webbing guide 29 slightly protrudes from the upper end of the seat back frame 3a, and the webbing insertion opening is formed in the protruding portion. 26 is formed, and the webbing 25 fed out from the main retractor 27 extends from the webbing insertion port 26 to the front side of the seat back 3 and becomes the shoulder belt 21.

  The vehicle rollover detecting means 11 includes a sensor for measuring the roll angle and roll rate of the vehicle, and the control box 14 rolls in a region B where the roll angle and roll rate exceed a threshold value K as shown in FIG. It is judged as over. In the present embodiment, the vehicle rollover detecting means 11 detects the lateral acceleration of the vehicle.

  When the vehicle equipped with the occupant protection device 10 rolls over due to rollover as shown in FIGS. 13 (a) to 13 (c), an air bag as shown in FIGS. 14 (a), 14 (b), and 14 (c). 13. The seat belt device 20 and the seat back 3 are actuated to tilt the occupant C backward by a predetermined amount to expand the space between the occupant head Ch and the ceiling. 13A shows a state in which the lateral force F is input, FIG. 13B shows a state in which the vehicle body 1 has rotated 1/4, and FIG. 13C shows a state in which the vehicle body has rotated 3/4.

  FIG. 14A shows a normal state in which no rollover occurs, and the occupant C is seated on the seat 1 wearing the seat belt device 20 to which the airbag 13 is attached. In this state, the vehicle rollover detecting means 11 is shown. 14 (b) and 14 (c), the airbag 13 is inflated to press the occupant C against the seat back 3, and the occupant C is tilted backward by a predetermined amount together with the seat back 3. It is supposed to let you.

  At this time, the main retractor 27 can be rotated forward / reversely by driving a motor, so that the seat belt device 20 has a reversible function for returning to a state before detection of rollover.

  In the occupant protection device 10, the control box 14 detects the rollover according to the flowchart shown in FIG. 15, and controls the seat back tilting means 12 and the airbag 13 based on the result, and In this embodiment, a curtain airbag 30 is provided as shown in FIG. 17, and this curtain airbag 30 is also controlled. However, in the present invention, the curtain airbag 30 is not particularly required. Absent.

  That is, in the flowchart, first, when the control is started by turning on the ignition, the roll rate, the roll angle, and the lateral acceleration are input in steps S1, S2, and S3. In step S4, the roll rate is determined using the map shown in FIG. From the roll angle, it is determined whether or not the vehicle is in the rollover area A before the rollover. If it is in the area A, the process returns to step S1, and if it is not in the area A, the process proceeds to the next step S5.

  In step S5, it is determined whether or not the vehicle is in area B of the map. If it is not in area B, the process returns to step S1, and if it is in area B, the process proceeds to step S6 to operate the seat back tilting means 12 That is, the operation pin 104a of the solenoid 104 is retracted to unlock the seat back 3, and the inflator 28 is operated in step S7 to inflate the airbag 13. At this time, the shoulder belt 21 is pulled in by operating the pretensioner function of the main retractor 27 in synchronization with the inflation of the airbag 13.

  Next, in step S8, the curtain airbag 30 is deployed to mitigate the occupant head Ch from interfering with the side of the vehicle body such as side window glass or pillars.

  As described above, according to the occupant protection device 10 when the vehicle rolls over according to this embodiment, the vehicle rollover detection means 11 that detects the rollover state of the vehicle and the seatback that allows the seatback 3 to tilt backward by a predetermined amount. A rollover is determined from the folding means 12, an airbag 13 that presses the upper body Cu of the occupant C in the direction of the seat back 3 by inflation, and a detection signal from the vehicle rollover detection means 11, and the seat back folding means 12 and Since the control box 14 for operating the airbag 13 is provided, the rollover is performed in the normal operation state in which the occupant C is seated on the seat 1 while wearing the seat belt 20 as shown in FIG. When detected, the seat back tilting means 12 is actuated so that the seat back 3 is allowed to tilt backward.

  When the airbag 13 is operated and inflated together with the operation of the seat back retractable means 12, the upper body Cu of the occupant C is pressed in the direction of the seat back 3 by the inflating force, and as shown in FIG. In the state where the passenger C is restrained by the seat 1 by the airbag 13, the seat back 3 is tilted backward by a predetermined amount.

  Then, the head Ch of the occupant C moves rearward about the center of rotation of the seat back 3, that is, the main shaft 100 (see FIG. 9), and the space between the occupant head Ch and the ceiling in the passenger compartment is increased. Since it is increased, it is possible to efficiently suppress the head Ch from interfering with the ceiling.

  Further, even in the occupant protection method when the vehicle rolls over according to this embodiment, when the vehicle rollover is detected, the seat back tilting means 12 that allows the seat back 3 to tilt backward by a predetermined amount, and the inflation The airbag 13 that presses the upper body Cu of the occupant C in the direction of the seat back 3 is actuated to tilt the seat back 3 together with the occupant C by a predetermined amount by the pressing force when the airbag 13 is inflated. The space between the occupant head Ch and the ceiling in the passenger compartment is increased by the rearward tilt of the seatback 3 at the time of rollover, and the head Ch can be efficiently suppressed from interfering with the ceiling.

  Furthermore, since the airbag 13 is formed in the shape of an elongated bag extending from the shoulder Cs on one side of the occupant C to the vicinity of the waist Cw on the opposite side along the shoulder belt 21 of the seat belt device 20, the airbag 13 is inflated. In this case, a force that is supported by the shoulder belt 21 and presses the upper body Cu of the occupant C in the direction of the seat back 3 can be efficiently generated, and an impact input to the upper body Cu can be effectively reduced. .

  Furthermore, a webbing 25 extending from the upper end of the shoulder belt 21 is taken into the seatback 3 through a webbing insertion opening 26 provided at the upper end of the seatback 3, and the taken-in webbing 25 is incorporated in the seatback 3. Since the retractor 27 is used for winding up, the webbing insertion opening 26 is provided in the seat back 3, so that the amount of winding of the shoulder belt 21 whose thickness is increased by the airbag 13 can be reduced and the storage space can be reduced. Can do.

  Further, since the enlarged portion 13d is formed in the upper end portion disposed in the vicinity of the webbing insertion opening 26 at the portion corresponding to the shoulder portion Cs of the occupant C, the enlarged portion 13d protects the side surface of the head Ch at the time of rollover. Can be increased.

  Further, the seat back tilting means 12 is locked to the seat back frame 3a tilting around the main shaft 100 by the solenoid 104 by using the main shaft 100 as the rotating shaft of the reclining device 60, so that it can be freely engaged and disengaged. The structure of the seat back tilting means 12 can be simplified, and the amount of rotation of the seat back frame 3a is restricted by the seat back backward tilt restricting means 105 when unlocked, so that the seat back 3 falls excessively and the occupant C It is possible to prevent anxiety from being felt and to prevent the rear seat occupant from being affected.

  Further, the vehicle rollover detecting means 11 includes a sensor for measuring the roll angle and roll rate of the vehicle, and the control box 14 detects a region B where the roll angle and roll rate exceed the threshold value K as shown in FIG. Since the rollover is determined, the vehicle rollover can be easily determined by a simple device.

  18 to 24 show a second embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted, and FIG. 18 shows an occupant protection device. FIG. 19 is an enlarged perspective view of a portion G in FIG. 18, FIG. 20 is a perspective view taken along line HH in FIG. 18, and FIG. 21 is an enlarged perspective view of portion I in FIG. 22 is a perspective view of a seat showing an operation start state of the occupant protection device, FIG. 23 is a perspective view of a seat showing a final operation state of the occupant protection device, and FIG. 24 is an operation image of the occupant protection device. It is a perspective view which shows in order to (c).

  The occupant protection device 10A at the time of a vehicle rollover of the present embodiment basically has the same configuration as the occupant protection device 10 of the first embodiment, and as shown in FIG. 18, the vehicle rollover detection means 11 (see FIG. 1) and The seat back folding means 12, the airbag 13A, and the control box 14 (see FIG. 1) are provided, and the seat 2 includes a seat belt device 20 having a shoulder belt 21 and a lap belt 22. I have.

  In the present embodiment, a portion corresponding to the shoulder belt 21 is formed by an airbag 13A formed in an elongated bag shape, and the upper end portion of the airbag 13A is sewn to the webbing 25 in the vicinity of the webbing insertion opening 26, and As shown in FIG. 19, the lower end portion is sewed and joined to the lap belt 22, and the lower end portion of the airbag 13A is connected to the inflator 28 via the tube 28a, and the gas from the inflator 28 is transferred to the lower portion of the airbag 13A. It has come to introduce.

  As in the first embodiment, the airbag 13A is configured by covering the outer side with an airbag cover 13c while folding a bag body 13b continuous in the length direction as shown in FIG. The bag cover 13c is broken when the bag body 13b expands.

  Further, even in the present embodiment, the enlarged portion 13d (see FIG. 23) is formed at the upper end portion of the airbag 13A, and the gas inlet through which the tube 28a communicates is provided at the lower end portion of the airbag 13A. Thus, a seam 31 is provided as a gas passage resistance means for delaying gas inflow to the enlarged portion at the boundary portion between the enlarged portion 13d and the general portion 13e. The seam 31 can be uncoiled when a predetermined gas pressure is applied to the one end portion 13e.

  Therefore, according to the occupant protection device 10A of the present embodiment, when a vehicle rollover is detected in a normal driving state as shown in FIGS. 18 and 24A, FIGS. 22 and 24B. The airbag 13A is inflated to tilt the seat back 3 together with the occupant C by a predetermined amount to increase the space between the occupant head Ch and the ceiling in the passenger compartment. In the embodiment, after the gas of the inflator 28 flows from the lower end of the airbag 13A to inflate the general portion 13e, the internal pressure of the general portion 13e reaches a predetermined pressure as shown in FIGS. 23 and 24C. Then, the seam 31 is released and gas is supplied to the enlarged portion 13d.

  For this reason, since the one end part 13e can be rapidly expanded ahead of the enlarged part 13d that requires a large amount of gas, the force for pressing the occupant C in the direction of the seat back 3 can be quickly increased when the enlarged part 13d is provided. Therefore, the timing of tilting the seat back 3 backward can be advanced.

  25 to 33 show a third embodiment of the present invention, in which the same reference numerals are given to the same components as those of the above-mentioned embodiments, and a duplicate description is omitted, and FIG. 25 applies the passenger protection device. 26 is an enlarged perspective view of a portion J in FIG. 25, FIG. 27 is a perspective view taken along a line KK in FIG. 25, and FIG. 28 is an enlarged perspective view of an L portion in FIG. 29 is a perspective view of a seat showing an initial operation state of the occupant protection device, FIG. 30 is a perspective view of a seat showing an intermediate state of operation of the occupant protection device, and FIG. 31 is a perspective view showing an operation completion state of the occupant protection device. FIG. 33 is a rear view showing the internal structure of the seat, and FIG. 33 is a perspective view showing the operation image of the occupant protection device in order from (a) to (d).

  The occupant protection device 10B at the time of the vehicle rollover of the present embodiment has basically the same configuration as the occupant protection device 10 of the first embodiment, and as shown in FIG. 25, the vehicle rollover detection means 11 (see FIG. 1) and The seat back folding means 12, the airbag 13B, and the control box 14 (see FIG. 1) are provided, and the seat 2 includes a seat belt device 20 having a shoulder belt 21 and a lap belt 22. I have.

  In the present embodiment, a portion corresponding to an intermediate portion of the shoulder belt 21 is formed by the airbag 13B formed in an elongated bag shape, and the upper end portion of the airbag 13B is formed near the webbing insertion opening 26 in the vicinity of the shoulder belt 21. The upper part 21up is sewn and joined, and the lower end part is sewn and joined to the lower part 21lo of the shoulder belt 21.

  A short webbing guide 29 is attached below the webbing insertion opening 26 as shown in FIG. 32, and the main retractor 27 is provided at the upper end of the seat back 3.

  The webbing guide 29 is provided with an inflator 32 attached to the main retractor 27, and the inflator 32 has a function of inflating the airbag 13B and a pretensioner function of the main retractor 27. Yes. Of course, even in this embodiment, the main retractor 27 has a load limiter function.

  A tube 33 connected to the inflator 32 is communicated with the upper end of the airbag 13B, and an upper gas inlet 34 is provided in FIG. 26, and the tube 33 is further extended so that the bag body 13b has an extension as shown in FIG. As shown in FIG. 28, a lower gas inlet 35 is provided by connecting the extended tube 33 to the lower end portion of the airbag 13B, as shown in FIG. Gas is injected into the airbag 13B from the gas inlet 35 substantially simultaneously.

  In this embodiment, as shown in FIGS. 26 and 32, the lap belt 22 is on the side opposite to the side continuous with the shoulder belt 21, that is, on the side opposite to the tongue 23 (outside in the vehicle width direction). A secondary retractor 36 as a second webbing take-up device is provided at the end, and the webbing 25 on the lap belt 22 side is taken up by the secondary retractor 36.

  Then, the auxiliary retractor 36 is housed in the lower part of the pillar member Mp located on the side of the seat 1.

  Therefore, according to the occupant protection device 10B of the present embodiment, when the rollover of the vehicle is detected, the inflator is provided from the upper gas inlet 34 and the lower gas inlet 35 provided at the upper end portion and the lower end portion of the airbag 13B. 32 gas is introduced to inflate the airbag 13B, and the seat back 3 is tilted backward by a predetermined amount together with the occupant C by the pressing force generated by the inflation of the airbag 13B. The space between them can be increased.

  At this time, since the inflator 32 also serves as a pretensioner for the main retractor 27, the airbag 13B is pulled together with the shoulder belt 21 to strongly restrain the occupant C on the seat back 3 side.

  In this embodiment, since the gas is injected into the airbag 13B from the upper gas inlet 34 and the lower gas inlet 35 substantially simultaneously, as shown in FIG. 25 and FIG. When rollover is detected in the operating state, gas is injected from the upper gas inlet 34 and the lower gas inlet 35 as shown in FIGS. 29 and 33 (b), and the upper and lower ends of the airbag 13B are particularly In the next stage, as shown in FIG. 30 and FIG. 33 (c), the gas at both ends moves to the substantially central portion of the airbag 13B and expands, and such gas movement is performed in a short time. As shown in FIG. 31 and FIG. 33 (d), the gas pressure is evenly distributed evenly throughout the airbag 13B, and the entire airbag 13B is inflated uniformly and rapidly.

  Therefore, in this embodiment, since the gas inlets 34 and 35 are provided at both upper and lower ends of the airbag 13B, the airbag 13B can be inflated quickly to perform an occupant protection operation against a rollover. The protective effect can be further increased.

  Further, since the auxiliary retractor 36 is provided on the opposite side of the lap belt 22 from the side continuous with the shoulder belt 21, and the webbing 25 on the lap belt 22 side is wound up by the auxiliary retractor 36, the airbag is attached to the shoulder belt 21. When 13B is provided, the webbing 25 can be smoothly wound up by the main retractor 27 and the sub retractor 36 without causing the airbag 13B to become an obstacle.

  34 to 42 show a fourth embodiment of the present invention, in which the same reference numerals are given to the same components as those of the above-mentioned embodiments, and the duplicated explanation is omitted, and FIG. 34 applies an occupant protection device. 35 is an enlarged perspective view of the portion M in FIG. 34, FIG. 36 is a cross-sectional view taken along line NN in FIG. 35, and FIG. 37 is a perspective view of the seat showing an operating state of the occupant protection device. FIG. 38 is an enlarged perspective view of the portion O in FIG. 37, FIG. 39 is a perspective view showing the operation completion state of the occupant protection device, FIG. 40 is an enlarged perspective view of the portion P in FIG. FIG. 42 is a perspective view showing an operation image of the occupant protection device in order from (a) to (c).

  The occupant protection device 10C at the time of the vehicle rollover of this embodiment basically has the same configuration as the passenger protection device 10 of the first embodiment, and as shown in FIG. 34, the vehicle rollover detection means 11 (see FIG. 1) and The seat back folding means 12, the airbag 13C, and the control box 14 (see FIG. 1) are provided, and the seat 2 includes a seat belt device 20 having a shoulder belt 21 and a lap belt 22. I have.

  In the present embodiment as well, as in the third embodiment, a portion corresponding to the intermediate portion of the shoulder belt 21 is formed by the airbag 13C formed in an elongated bag shape, and the upper end portion of the airbag 13C is formed. In the vicinity of the webbing insertion opening 26, the upper portion 21 up of the shoulder belt 21 is sewn and joined, and the lower end portion is sewn and joined to the lower portion 21 lo of the shoulder belt 21.

  A short webbing guide 29 is attached below the webbing insertion opening 26 as shown in FIG. 41. The webbing guide 29 is provided with a main retractor 27 located at the upper end of the seat back 3, and an inflator. 32 is provided so that the inflator 32 has a function of inflating the airbag 13C, a pretensioner function of the main retractor 27, and a function of inflating an auxiliary airbag 40 described later provided in the present embodiment. It is. Of course, even in this embodiment, the main retractor 27 has a load limiter function.

  Further, as shown in FIG. 35, the tube 33 connected to the inflator 32 is taken out from the webbing insertion port 26 and communicated with the upper end portion of the airbag 13C, and the shoulder of the lap belt 22 as in the third embodiment. The webbing 25 opposite to the side continuous with the belt 21 is wound up by a sub retractor 36 housed in the lower part of the pillar member Mp.

  In the present embodiment, as shown in FIGS. 34 and 36, an auxiliary airbag 40 that is inflated prior to the shoulder corresponding portion 13Cs is provided below the shoulder corresponding portion 13Cs (upper end portion) of the airbag 13C. It is.

  That is, the shoulder corresponding portion 13Cs is provided with a belt pad 41 that is slidably fitted around the outer periphery of the airbag 13C, and the auxiliary airbag 40 is folded on the lower surface side of the belt pad 41. It is stored.

  The belt pad 41 is formed of a flexible member, and as shown in FIG. 35, a separation band 41a such as a perforation or a groove continuous in the length direction is formed at the center in the width direction of the upper side surface, and the belt An opening that allows the auxiliary airbag 40 to jump out is formed on the lower surface of the pad 41, and an auxiliary belt 42 that is connected to the rear end of the belt pad 41 is formed at the upper end of the seat back 3. It is inserted into the seat back 3 from the opening 43.

  The auxiliary tube 44 branched from the tube 33 inside the seat back 3 is taken out from the opening 43 along the auxiliary belt 42, and the tip of the auxiliary tube 44 is communicated with the auxiliary airbag 40.

  Therefore, when the inflator 32 is activated when a vehicle rollover is detected, the gas flows into the airbag 13C and the auxiliary airbag 40 through the tube 33 and the auxiliary tube 44 substantially simultaneously. As shown in FIGS. 37 and 38, the auxiliary airbag 40 is inflated prior to the airbag 13C because of its small volume, and then the airbag 13C is inflated as shown in FIGS.

  Further, when the airbag 13C is inflated, as shown in FIG. 40, the belt pad 41 is broken from the separation band 41a so that the airbag 13C jumps upward.

  Therefore, according to the occupant protection device 10C of the present embodiment, when a rollover of the vehicle is detected, the inflator 32 is activated and the airbag 13C is inflated in the same manner as in each of the above embodiments, so that the seat back 3 is C can be tilted backward by a predetermined amount to increase the space between the occupant head Ch and the vehicle interior ceiling. In the present embodiment, the auxiliary airbag 40 is provided in the airbag 13C. Prior to the occupant C restraint, the shoulder Cs of the occupant C can be restrained.

  That is, as shown in FIGS. 34 and 42 (a), when a rollover of the vehicle is detected in a normal driving state, the inflator 32 is operated together with the operation of the seat back tilting means 12, and the tube 33 and the auxiliary tube 44 are operated. To supply gas. At this time, since the inflator 32 also serves as a pretensioner for the main retractor 27, the airbag 13 </ b> C is pulled together with the shoulder belt 21 to strongly restrain the passenger C with the seat 2.

  Next, as shown in FIGS. 37 and 42 (b), the auxiliary airbag 40 is inflated prior to the airbag 13C by the operation of the inflator 32, and the passenger C is moved to the shoulder Cs side by the expansion of the auxiliary airbag 40. The seat back 3 is tilted backward by a predetermined amount by the pressing force at this time.

  Then, as shown in FIGS. 39 and 42 (c), the airbag 13C is finally inflated to firmly restrain the passenger C to the seat back 3, and the airbag 13C is inflated on the upper side of the auxiliary airbag 40. Therefore, the restraining force of the occupant shoulder Cs by the auxiliary airbag 40 is further increased, and the occupant C can be more reliably prevented from sliding down in the ceiling direction even when the vehicle rolls over to the extent that the vehicle is almost reversed. , Occupant protection effect can be enhanced.

  By the way, although this invention was demonstrated taking the example in the said 1st-4th embodiment, various other embodiment can be employ | adopted in the range which is not restricted to these embodiments and does not deviate from the summary of this invention.

  In each of the above embodiments, the seat back tilting means 12 preferably includes an electric actuator that drives the seat back 3 to tilt backward.

  In this case, the rear tilt timing of the seat back 3 can be arbitrarily set by the electric actuator, and the occupant C can be protected more appropriately.

  In each of the above embodiments, the seat back tilting means 12 preferably includes an explosive actuator that drives the seat back 3 to tilt backward.

  In this case, the seat back 3 can be instantaneously tilted backward by the explosive actuator, and the occupant C can be protected more quickly when a rollover is detected.

  Furthermore, it is desirable that the main retractor 27 is driven to take up with an explosive actuator.

  In this case, since the shoulder belt 21 can be pulled in instantaneously by the main retractor 27 from the explosive actuator 2, the occupant C is restrained and the seat back 3 is tilted more quickly, thereby further enhancing the occupant C protection effect. be able to.

  Furthermore, it is desirable that the main retractor 27 is selectively wound up by an explosive actuator or an electric actuator.

  In this case, the main retractor 27 can be instantaneously operated by the explosive actuator, while the main retractor 27 can be operated at an arbitrary timing by the electric actuator, and the passenger C is protected more quickly and efficiently. be able to.

The perspective view of the sheet | seat to which the passenger | crew protection device in 1st Embodiment of this invention is applied. The expansion perspective view of the A section in FIG. The expansion perspective view of the B section in FIG. The expansion perspective view of the C section in FIG. The perspective view made into the cross section from the DD line in FIG. The perspective view made into the cross section from the EE line in FIG. The perspective view of the sheet | seat which shows the operation state of the passenger | crew protection device in 1st Embodiment of this invention. The expansion perspective view of the F section in FIG. The rear view which shows the internal structure of the sheet | seat in 1st Embodiment of this invention. The disassembled perspective view which shows the internal structure of the seat back lower part in 1st Embodiment of this invention in detail. The rear view which shows the internal structure of the lower part of the sheet | seat in 1st Embodiment of this invention as a principal part cross section. The front view which shows the detailed structure of the seat back back inclination restriction | limiting means in 1st Embodiment of this invention. The front view which shows the rollover state of the vehicle by roll over in 1st Embodiment of this invention later on in order to (a)-(c). The side view of the sheet | seat which shows the operation state of the passenger | crew protection device in 1st Embodiment of this invention later on to (a) and (b), (c). Explanatory drawing of the flowchart which controls the passenger | crew protection apparatus in 1st Embodiment of this invention. The map which shows an example of determination of rollover in 1st Embodiment of this invention. The perspective view which shows the operation | movement image of the passenger | crew protection device in 1st Embodiment of this invention later on to (a), (b). The perspective view of the sheet | seat to which the passenger | crew protection device in 2nd Embodiment of this invention is applied. The enlarged perspective view of the G section in FIG. The perspective view made into the cross section from the HH line in FIG. The enlarged perspective view of the I section in FIG. The perspective view of the sheet | seat which shows the operation start state of a passenger | crew protection device. The perspective view of the sheet | seat which shows the final operation state of a passenger | crew protection apparatus. The perspective view which shows the operation | movement image of a passenger | crew protection apparatus in order to (a)-(c). The perspective view of the sheet | seat to which the passenger | crew protection device in 3rd Embodiment of this invention is applied. The expanded perspective view of the J section in FIG. The perspective view made into the cross section from the KK line | wire in FIG. The expansion perspective view of the L section in FIG. The perspective view of the sheet | seat which shows the operation | movement initial state of the passenger | crew protection device in 3rd Embodiment of this invention. The perspective view of the sheet | seat which shows the operation middle state of the passenger | crew protection device in 3rd Embodiment of this invention. The perspective view which shows the operation completion state of the passenger | crew protection apparatus in 3rd Embodiment of this invention. The rear view which shows the internal structure of the sheet | seat in 3rd Embodiment of this invention. The perspective view which shows the operation | movement image of the passenger | crew protection device in 3rd Embodiment of this invention later on in order to (a)-(d). The perspective view of the sheet | seat to which the passenger | crew protection device in 4th Embodiment of this invention is applied. The expanded perspective view of the M section in FIG. FIG. 36 is a sectional view taken along line NN in FIG. 35. The perspective view of the sheet | seat which shows the operation middle state of the passenger | crew protection apparatus in 4th Embodiment of this invention. The expansion perspective view of the O section in FIG. The perspective view which shows the operation completion state of the passenger | crew protection apparatus in 4th Embodiment of this invention. The expansion perspective view of the P section in FIG. The rear view which shows the internal structure of the sheet | seat in 4th Embodiment of this invention. The perspective view which shows the operation | movement image of the passenger | crew protection device in 4th Embodiment of this invention later on to (a)-(c).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seat 2 Seat cushion 3 Seat back 3a Seat back frame 10, 10A, 10B, 10C Passenger protection device 11 Vehicle rollover detection means 12 Seat back tilting means 13, 13A, 13B, 13C Air bag 13d Air bag expansion part 13e Air General part of bag 13Cs Corresponding part of shoulder part of airbag 14 Control box (control means)
20 seat belt device 21 shoulder belt 22 lap belt 25 webbing 26 webbing insertion port 27 main retractor (first webbing take-up device)
31 Seam (gas passage resistance means)
34 Upper gas inlet 35 Lower gas inlet 36 Sub-retractor (second webbing take-up device)
40 Auxiliary airbag 60 Reclining device 100 Main shaft (rotating shaft)
104 Solenoid (locking means)
105 Seat back backward tilt limiting means C Crew Cu Upper body Cs Shoulder Cc Chest Cw Lumbar K Threshold

Claims (15)

A seat with a seat cushion and a seat back;
Vehicle rollover detecting means for detecting a rollover state of the vehicle;
A seat back tilting means that allows a predetermined amount of backward tilt of the seat back;
An airbag that presses the upper body of the occupant in the seat back direction by inflation;
From the detection signal of the vehicle rollover detection means determines rollover, set and control means, the operating the seatback foldable means and said air bag,
When a rollover is detected, the seat back is allowed to tilt backward, the airbag is inflated and the occupant is pressed, and the occupant is restrained to the seat by the airbag after the predetermined amount of time. occupant protection system during a vehicle rollover, characterized in that the inclination.   The seat is routed from the shoulder of one side of the occupant to the waist on the opposite side via the chest and the upper body is restrained to the seat back, and the lower body is seated over both sides of the occupant's waist A seat belt device having a lap belt restrained by a cushion, and the airbag is formed in an elongated bag shape extending from one shoulder portion of the occupant to the vicinity of the opposite waist portion along the shoulder belt. The occupant protection device at the time of the vehicle rollover according to claim 1.   3. The webbing extending from the upper end of the shoulder belt is taken into the seat back from the upper end of the seat back, and the taken-in webbing is taken up by a first webbing take-up device built in the seat back. Occupant protection device when the vehicle rolls over.   The occupant protection device according to claim 2 or 3, wherein the airbag is provided with an enlarged portion at a portion corresponding to a shoulder portion of the occupant.   5. The second webbing take-up device is provided on the opposite side of the lap belt from the side continuous with the shoulder belt, and the webbing on the lap belt side is taken up by the second webbing take-up device. The occupant protection device at the time of a vehicle rollover according to any one of the above. The seat back collapsible means uses a pivot shaft of the reclining device, and locks the seat back frame tilting around the pivot shaft so as to be freely disengaged, and unlocking upon detection of rollover, and
The occupant protection at the time of the vehicle rollover according to any one of claims 1 to 5, further comprising: a seatback rearward tilt limiting unit that limits a rotation amount of the seatback frame with respect to the rotation shaft. apparatus.   The occupant protection device during vehicle rollover according to any one of claims 1 to 6, wherein the seat back tilting means includes an electric actuator that drives the seat back to tilt backward.   The occupant protection device at the time of a vehicle rollover according to any one of claims 1 to 6, wherein the seat back tilting means includes an explosive actuator that drives the seat back to tilt backward.   9. A gas passage resistance means for delaying gas inflow to the enlarged portion is provided at a boundary portion between the enlarged portion and the general portion, and a gas inflow port is provided at a lower end portion of the airbag. The occupant protection device during vehicle rollover according to any one of the above.   The airbag has gas inlets at the upper end and lower end of the airbag, respectively, and gas is injected into the airbag from the respective gas inlets substantially simultaneously. The occupant protection device at the time of a vehicle rollover according to one.   The auxiliary airbag that inflates prior to the shoulder corresponding portion is provided below the shoulder corresponding portion of the airbag, when the vehicle rolls over according to claim 1. Crew protection device.   The occupant protection device during vehicle rollover according to any one of claims 3 to 11, wherein the first webbing take-up device is driven to take up by an explosive actuator.   The occupant protection device at the time of a vehicle rollover according to any one of claims 3 to 11, wherein the first webbing take-up device is selectively wound up by an explosive actuator or an electric actuator.   The vehicle rollover detection means includes a sensor for measuring a roll angle and a roll rate of the vehicle, and the control means determines that a region where the roll angle and the roll rate exceed a threshold value is a rollover. The occupant protection device at the time of a vehicle rollover according to any one of 1 to 13. Detects vehicle rollover by means of vehicle rollover detection means, and activates a seatback retractable means that allows a predetermined amount of backward tilting of the seatback and an airbag that presses the upper body of the occupant in the seatback direction by inflation When the rollover is detected, the seat back is allowed to tilt backward, the airbag is inflated and the occupant is pressed, and the occupant is restrained by the airbag and the seat back is An occupant protection method when the vehicle rolls over, which is tilted backward by a predetermined amount .

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