JP2020075675A - Seat belt device - Google Patents

Abstract

To provide a seat belt device which enables a waist belt to securely restrain the anterior superior iliac spine by a pretensioner drawing the seat belt.SOLUTION: A three point type seat belt device 10 includes: a support part (a lower end part of a buckle stay 42) provided at the lap anchor 23 side or the buckle device 40 side of a waste belt 11B; and a waste belt operation device 50 which draws the support part into the lower side of a vehicle and moves the support part to the rear of the vehicle.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a seat belt device.

  In a three-point seatbelt device, a seatbelt (webbing) has a shoulder belt that is slanted from the upper side of one side of the occupant to the lower side of the other side diagonally in front of the chest and the waist belt from one side of the left side to the other side. And a tongue connected to the shoulder belt and the waist belt is inserted into and engaged with a buckle fixed to the vehicle body, thereby restraining the occupant's chest and waist and at the time of a vehicle collision. Prevents passengers from being thrown forward.

  In the three-point seat belt device having such a structure, the occupant having inertia tends to move forward due to the collision, so that the slack of the belt is removed and the buckle of the seat belt is removed when the vehicle is suddenly decelerated. Buckle devices with retractable pretensioners are known. In addition, when the occupant is excessively restrained by the seat belt, the burden on the ribs becomes large, or the lower part of the ribs is largely deformed. In order to alleviate this, some recent seatbelt devices are provided with an energy absorbing mechanism in the retractor portion so that excessive restraint does not occur. However, since the energy absorption mechanism increases the amount of movement of the occupant, it is generally assumed that the energy absorption mechanism should be used together with the airbag.

  Further, the buckle device for a seat belt of Patent Document 1 follows a guide rail by a driving force generation unit that generates a driving force in response to a deceleration of a vehicle, a guide rail fixed to a seat cushion, and a driving force. The first slider connected to the guide rail so as to move to the rear of the vehicle and the rod of the buckle are connected, and when the seat belt tension exceeds the set value, the first slider can move relatively to the front of the vehicle. And a second slider connected to the first slider to improve the initial restraint by the seat belt tension of the pretensioner and reduce the impact on the occupant.

  Further, as another three-point type seat belt device, the buckle position can be moved forward by separating the seat belt at the buckle portion during a collision, and the waist belt (lap belt) and the shoulder belt (shoulder belt) can be separated. There is known a document relating to a separable buckle (split buckle) in which the belt tension acting on the chest is reduced without reducing the waist restraining force by separating (see, for example, Non-Patent Document 1).

JP, 11-321559, A

Bengt Pipkorn, Francis J. Lopez-Valdes, Oscar Juste-Lorente, Ricardo Insausti, Christer Lundgren & Cecilia Sunnevang (2016) "Assessment of an innovative seat belt with independent control of the shoulder and lap portions using THOR tests, the THUMS model, and PMHS test", Traffic Injury Prevention, 17: Sup1, pp. 124-130

  By the way, in the three-point seat belt device, when the pretensioner pulls in the seat belt, the waist belt makes the ilium of the occupant, particularly, the superior anterior iliac spine (Anterior Superior Iliac Spine, also referred to as "ASIS" hereinafter). Is desired to be restrained. However, if the occupant sits in a position different from the normal position, or the physique or clothing of the occupant causes the initial position of the waist belt to be above the thigh, that is, above the ASIS, the pretensioner may be used. May not be able to restrain ASIS when the seat belt is pulled in.

  The pretensioner described in Patent Document 1 does not consider the restraint of ASIS, and by moving the second slider forward of the vehicle, the belt tension acting on the chest can be reduced, but at the same time, the lumbar restraint force is also reduced. There is a problem of reduction.

  In addition, the seat belt device described in Non-Patent Document 1 requires a complicated mechanism for enabling separation of the lap belt and the shoulder belt.

  The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a seat belt device capable of reliably restraining the anterior superior iliac spine by the waist belt by retracting the pretensioner. is there.

The above object of the present invention is achieved by the following configurations.
(1) A seat belt that has a shoulder belt that extends from the shoulders of the occupant to the waist and a waist belt that extends over both sides of the occupant at the waist to restrain the occupant,
A buckle device capable of engaging a tongue provided on the seat belt,
A lap anchor that fixes the end portion of the seat belt to the vehicle body side (for example, a seat cushion, or a member that moves together with the seat cushion, or a floor panel),
A three-point seat belt device including:
A support portion provided on at least one of the lap anchor side and the buckle device side of the waist belt,
A waist belt actuating device for pulling the support part downward of the vehicle and moving the support part rearward of the vehicle,
A seat belt device.
(2) The support portion is provided on at least one of the wrap anchor and the buckle device,
The seat belt device according to (1), wherein the waist belt actuation device includes a guide portion that pulls the support portion downward of the vehicle and moves the support portion toward the rear of the vehicle.
(3) The seat belt device according to (2), wherein the guide portion is formed in a linear shape and is inclined with respect to a horizontal plane so as to be directed downward toward the rear of the vehicle.
(4) The support portion is one end portion of a buckle stay fixed to the buckle, which is provided in the buckle device,
The inclination angle of the buckle stay with respect to the horizontal plane is set to be larger than the inclination angle of the guide portion with respect to the horizontal plane,
The seatbelt device according to (3), wherein the inclination angle of the buckle stay with respect to the horizontal plane is maintained when the support portion is pulled downward of the vehicle and is moved rearward of the vehicle.
(5) The guide portion is connected via an intermediate portion in which a front side portion and a rear side portion having different inclination angles with respect to the horizontal plane are curved, and the front side portion is more inclined with respect to the horizontal plane than the rear side portion. The seat belt device according to (2), which has a large inclination angle.
(6) The support portion is one end portion of a buckle stay provided on the buckle device and fixed to the buckle,
The inclination angle of the buckle stay with respect to the horizontal plane is set to be equal to or greater than the inclination angle of the front side portion with respect to the horizontal plane,
The seatbelt device according to (5), wherein the inclination angle of the buckle stay with respect to the horizontal plane is maintained when the support portion is pulled downward of the vehicle and is moved rearward of the vehicle.
(7) In the waist belt actuating device, a retracting portion that retracts the supporting portion by combustion gas pressure of explosives, a shaft portion that is attached to the supporting portion and moves in the guide portion, the retracting portion, and the shaft portion. The seatbelt device according to any one of (2) to (6), further comprising:
(8) The seat cushion of the seat is movable in the front-rear direction with respect to the vehicle,
The seat belt device according to any one of (2) to (7), wherein the waist belt actuation device is attached to the seat cushion or a member that moves together with the seat cushion.
(9) The lap anchor is fixed to a floor panel,
The waist belt actuation device pulls the waist belt insertion part, through which the waist belt on the lap anchor side is inserted, as the support part, and pulls the waist belt downward toward the vehicle, and moves it toward the rear of the vehicle,
The seat belt device according to (1), wherein another waist belt actuating device for retracting the waist belt is arranged in the buckle device.
(10) The waist belt is
When the support portion is pulled downward of the vehicle, pressing the upper surface of the thigh portion of the occupant,
The seat according to any one of (1) to (9), which moves along the upper surface of the thigh so as to hang on the superior anterior iliac spine when the support portion moves rearward of the vehicle. Belt device.

  According to the seatbelt device of the present invention, the support portion provided on at least one of the lap anchor side and the buckle device side of the waist belt, and the support portion is pulled downward of the vehicle and moved toward the rear of the vehicle. Since the waist belt actuation device is provided, the waist belt can surely restrain the superior anterior iliac spine by retracting the pretensioner when the vehicle rapidly decelerates.

It is the side view which looked at the state where the seat belt device concerning a 1st embodiment of the present invention was worn from the occupant's right side. It is sectional drawing of the waist belt actuation apparatus shown in FIG. It is the perspective view which looked at the state where the seat belt device shown in FIG. (A) is a schematic diagram which shows the angle which a rib of a passenger | crew of a conventional seatbelt device and a shoulder belt make, (b) is an angle which a rib of a passenger | crew of a seatbelt of a 1st embodiment and a shoulder belt make. It is a schematic diagram which shows. It is a sectional view of a waist belt operating device of a seat belt device concerning a 2nd embodiment of the present invention. It is the perspective view which looked at the state where the seat belt device concerning a 3rd embodiment of the present invention was worn from the occupant's left side. It is the perspective view which looked at the state where the seat belt device concerning a 4th embodiment of the present invention was worn from the passenger's left side.

  Hereinafter, embodiments of a three-point seat belt device according to the present invention will be described in detail with reference to the drawings. In the first and second embodiments, the waist belt actuating device is arranged on the buckle device side, and in the third and fourth embodiments, the waist belt actuating device is arranged on the lap anchor side.

(First embodiment)
As shown in FIG. 1, the seatbelt device 10 is provided on a seatbelt 11 and a wall portion inside the vehicle compartment, and the seatbelt 11 is folded back near the shoulder of the occupant M. The retractor 22 that winds up one end of the seat belt 11, the lap anchor 23 that fixes the other end of the seat belt 11 to the vehicle body, and the buckle device 40 that can engage the tongue 12 attached to the seat belt 11. And mainly.

  Referring to FIG. 3 as well, the seat belt 11 extends from one upper part on one side of the occupant M seated on the seat 25 (upper left part of the occupant M in the example in the figure) to the lower part on the other side, from the shoulder Ms to the front of the chest. A shoulder belt 11A that extends diagonally to the waist portion Mw, and a waist belt 11B that extends from one side of the left and right sides (the left side of the occupant M in the example in the drawing) to the other side and the waist portion Mw extends over both sides of the occupant M are provided. The belt 11A and the waist belt 11B are formed as one continuous belt.

  The shoulder belt 11A is guided by the through anchor 20 located above the seat back 27, and fits well from the shoulder Ms of the occupant M to the chest. The tongue 12 is movably supported by the seat belt 11, and is inserted and locked in the buckle device 40 when the belt is worn, so that the seat belt 11 is divided into a shoulder belt 11A and a waist belt 11B. That is, the belt insertion hole 12a of the tongue 12 forms the boundary portion 13 between the shoulder belt 11A and the waist belt 11B.

  As the occupant M in the present embodiment, any one of human body dummies THOR-M, Hybrid III, and THUMS determined by the NHTSA (National Highway Traffic Safety Administration) standard is used. However, other dummies may be applied.

  As shown in FIG. 2, the buckle device 40 includes a buckle 41 that can engage the tongue 12, and a metal plate or the like that is fixed to the buckle 41 and extends on the side opposite to the insertion port of the tongue 12. Buckle stay 42 made of a material having rigidity, and a waist belt operation as a pretensioner for pulling one end portion (lower end portion) of the buckle stay 42 constituting the support portion downward of the vehicle and moving the buckle stay 42 toward the rear of the vehicle And a device 50.

  The waist belt actuating device 50 is accommodated in a pyrotechnic gas generator 66 provided in a housing 65, a cylinder 62 connected to the housing 65, and slidably accommodated in the cylinder 62, and is generated from the gas generator 66 in an emergency. And a piston 61 as a retracting portion that operates in the cylinder 62 by the combustion gas pressure.

  The gas generator 66 has a gas generation unit and an ignition unit (not shown). When a sensor (not shown) detects a sudden deceleration of the vehicle, an ignition signal is sent to the ignition unit to activate the ignition unit, and the gas generator 66 is activated. Spurts hot gas.

  In the housing 65, a winding portion 68 around which the wire member 64 is wound is formed to be bent in a substantially V shape at an angle α, the cylinder 62 is fixed to one end side of the winding portion 68, and the winding portion 68 A guide part 51 having a linear guide surface 53 is fixed to the other end side.

  The buckle device 40 is attached to, for example, a frame frame (not shown) that moves with the seat cushion 26 or the seat cushion 26, the cylinder 62 extends horizontally in the front-rear direction of the vehicle, and the guide portion 51 extends from the rear of the vehicle. It is installed so as to be gradually higher toward the front of the vehicle.

  Further, the waist belt actuating device 50 is a support shaft 43 that is a shaft portion fixed to the lower portion of the buckle stay 42, and a slide member that is supported by the support shaft 43 and moves in the guide portion 51 along the guide surface 53. It has a moving part 44 and a wire member 64 as a connecting member for connecting the piston 61 and the support shaft 43.

  One end of the wire member 64 is connected to the support shaft 43 of the sliding portion 44, and the other end of the wire member 64 is connected to the piston 61 via a winding portion 68 provided in the housing 65. The winding portion 68 is provided behind the cylinder 62 in the vehicle front-rear direction, and changes the drawing direction so that the wire member 64 extending from the piston 61 is directed toward the support shaft 43.

The inclination angle of the buckle stay 42 with respect to the horizontal plane is set to be larger than the inclination angle of the guide portion 51 with respect to the horizontal plane, and when the sliding portion 44 moves in the guide portion 51, the inclination angle of the buckle stay 42 with respect to the horizontal plane is set. Slide while holding.
In addition, a long hole 52 is provided on the side surface of the guide portion 51 on the occupant side along the longitudinal direction of the guide portion 51, and one end of a support shaft 43 that supports the sliding portion 44 projects from the long hole 52 and the buckle stay. It is fixed to 42.

  In the seat belt device 10 of the present embodiment configured as described above, the sliding portion 44 before the waist belt actuating device 50 is actuated is at the upper end of the guide portion 51 as shown by the solid line in FIG. Is also located in front of the waist. When the tongue 12 is engaged with the buckle 41 at this position, the waist belt 11B moves the waist belt 11B onto the thigh Mt in front of the upper anterior iliac spine of the occupant M, as shown by the solid line in FIG. Position so that the front and back surfaces are approximately horizontal.

  Then, in an emergency, the high pressure gas injected from the gas generator 66 of the waist belt actuation device 50 is supplied into the cylinder 62, and the wire member 64 is drawn into the cylinder 62 as the piston 61 moves. The drawing direction of the wire member 64 is changed via the winding part 68, the sliding part 44 slides in the guide part 51, and the one end part of the buckle stay 42 and the buckle 41 are drawn below the vehicle. At the same time, it is moved toward the rear of the vehicle.

  At that time, the seat belt 11 first presses the upper surface of the thigh Mt of the occupant M downward. When the buckle 41 is further moved downward and rearward of the vehicle by the further operation of the waist belt actuating device 50, the waist belt 11B is exposed while suppressing the thigh Mt as shown by the broken line in FIG. While the back surface is substantially horizontal, the back belt 11B moves backward on the thigh Mt, and the waist belt 11B engages the superior anterior iliac spine. At this time, the front and back surfaces of the waist belt 11B stand up and change their orientations so that one of the front and back surfaces comes into contact with the abdomen of the occupant M to restrain the upper anterior iliac spine. Therefore, even if the position of the superior anterior iliac spine varies for each occupant M, the superior anterior iliac spine can be reliably captured in a wide range. As a result, the occupant M is effectively restrained.

  Further, at the time of a vehicle frontal collision, an occupant M, who is an inertial body trying to move to the front of the vehicle in the early stage of the collision, is restrained by a shoulder belt 11A stretched across a shoulder (clavicle) Ms and a waist (pelvis) Mw. To be done.

  Here, as schematically shown in FIG. 4A, in the seat belt device using the conventional buckle device, the tongue engaged with the buckle 41 becomes the boundary portion 13X between the shoulder belt 11A and the waist belt 11B. The belt insertion hole 12 a of 12 is located near the seat 25. Therefore, if the angle between the lower portion of the ribs Mr and the shoulder belt 11A is θ, the angle θ becomes smaller with the forward movement of the occupant M, and the force of the bending direction of the ribs Mr increases.

  On the other hand, in the seat belt device 10 of the present embodiment shown in FIG. 4B, the boundary portion 13 between the shoulder belt 11A and the waist belt 11B is the front edge of the iliac Mi, so that the occupant M moves. The angle θ is constant, and the flexure of the ribs Mr is limited between the clavicle and the pelvis. Therefore, the boundary portion 13 is prevented from biting into the abdomen of the occupant M at the time of a collision, and the flexure of the chest of the occupant M can be reduced.

  Further, since the buckle 41 is pulled downward by the waist belt actuating device 50 at the time of a frontal collision of the vehicle, the occupant M tries to move to the front of the vehicle at the initial stage of the collision, and the occupant M leans into the seat belt 11 as well. The phenomenon is prevented. As a result, it is possible to maintain the restraint of the shoulder belt 11A that is stretched through the shoulder Ms and the waist Mw, prevent the boundary 13 from biting into the abdomen of the occupant M at the time of a collision, and the chest of the occupant M is prevented. The deflection can be reduced more reliably.

Further, as shown in FIG. 1, the seat cushion 26 is movable in the vehicle front-rear direction on a rail 28 attached to the floor surface. On the other hand, since the waist belt actuating device 50 is fixed to the seat cushion 26 or a member that moves together with the seat cushion 26, even if the position of the seat cushion 26 is adjusted back and forth, the guide portion 51 and the buckle 41 are engaged. The relative position with respect to the tongue 12 that has been cut does not change. As a result, the seat belt 11 is always pulled along the same trajectory regardless of the position of the seat cushion 26. Further, this effect is not affected by the length of the buckle stay 42.
The waist belt actuation device 50 may be attached to the floor surface on the side of the seat 25. In this case, the relative position between the guide portion 51 and the tongue 12 is changed by adjusting the position of the seat cushion 26.

(Second embodiment)
Next, a seat belt device according to a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the shape of the guide portion 51A of the waist belt actuation device 50A is different from that of the first embodiment. The guide portion 51A has a front side portion 54 and a rear side portion 55 having different inclination angles with respect to the horizontal plane, and the front side portion 54 and the rear side portion 55 are smoothly connected via a curved intermediate portion 56. ing.

The front side portion 54 and the rear side portion 55 are both inclined with respect to the horizontal plane so as to be directed downward toward the rear of the vehicle, but the inclination angle α1 of the front side portion 54 is equal to that of the rear side portion 55. It is larger than the inclination angle α2. That is, the guide surface 54a of the front portion 54 has a larger inclination angle than the guide surface 55a of the rear portion 55.
Further, in the present embodiment, the inclination angle of the buckle stay 42 with respect to the horizontal plane is set to the inclination angle α1 of the front portion 54 with respect to the horizontal plane. The inclination angle of the buckle stay with respect to the horizontal plane may be set to be equal to or greater than the inclination angle α1 of the front portion 54 with respect to the horizontal plane.

  As a result, the sliding portion 44 moves along the guide surface 54a of the front side portion 54 while the buckle stay 42 maintains the inclination angle at the initial stage of retracting the seat belt 11 immediately after the operation of the waist belt operating device 50. The buckle stay 42, the buckle 41, and the tongue 12 are mainly pulled downward, and the upper surface of the thigh Mt of the occupant M is pressed downward by the waist belt 11B.

  Then, from the middle to the latter half of the retracting of the seat belt 11, the sliding portion 44 moves along the guide surface 55a of the rear side portion 55 while the buckle stay 42 maintains the inclination angle, and the buckle stay 42, the buckle 41, and the tongue. 12 moves mainly toward the rear.

As a result, the waist belt 11B moves rearward on the thigh Mt while pressing the upper surface of the thigh Mt and the front and back surfaces thereof are substantially horizontal, and the waist belt 11B engages the upper anterior iliac spine. At that time, the front and back surfaces of the waist belt 11B stand up and change their orientations so that one of the front and back surfaces contacts the abdomen of the occupant M to restrain the upper anterior iliac spine.
Thus, in the initial stage of operation of the waist belt actuator 50, the thigh Mt of the occupant M is mainly restrained downward by the waist belt 11B, and the tongue 12 is further retained in the latter half of the operation of the waist belt actuator 50. The waist belt 11B is moved in two steps by moving the upper back iliac spine more effectively to be restrained.
Other configurations and operations are similar to those of the seat belt device 10 of the first embodiment.

(Third Embodiment)
Next, a seat belt device according to a third embodiment of the present invention will be described with reference to FIG. As shown in FIG. 6, in the seatbelt device 10A of the third embodiment, the waist belt actuation device 50 having the same structure as the seatbelt device 10 of the first embodiment is provided on the lap anchor 23 side, and the seat cushion 26 or the seat cushion 26 or It is attached to a member that moves with the seat cushion 26 and is connected to the lap anchor 23. A through hole (not shown) provided in the lap anchor 23 constitutes a support portion, and a sliding portion 44 interlocking with the support portion via a support shaft 43 is provided below the vehicle along the guide surface 53 of the guide portion 51. And it is guided to the rear of the vehicle.

Then, when the waist belt actuating device 50 is activated in an emergency or the like, the lap anchor 23 guided by the guide surface 53 is drawn below the vehicle and moves toward the rear of the vehicle. Also in this case, the waist belt 11B moves rearward on the thigh Mt while suppressing the thigh Mt of the occupant M, and is caught by the upper anterior iliac spine to effectively restrain the occupant M.
Other configurations and operations are similar to those of the seat belt device 10 of the first embodiment.

(Fourth Embodiment)
Next, a seat belt device according to a fourth exemplary embodiment of the present invention will be described with reference to FIG. 7. The seat belt device 10B according to the present embodiment includes a waist belt actuation device 50 having the same structure as that of the third embodiment, and a waist belt insertion portion 24 through which the lap anchor 23 side portion of the waist belt 11B is inserted. . The waist belt actuating device 50 is attached to the seat cushion 26 or a member that moves together with the seat cushion 26, is attached to the end portion of the waist belt 11B, and the lap anchor 23 is fixed to the floor panel of the vehicle body. In addition, a through hole (not shown) provided in the waist belt insertion portion 24 constitutes a support portion, and the sliding portion 44 that interlocks with the support portion via the support shaft 43 extends along the guide surface 53 of the guide portion 51. Is guided below the vehicle and behind the vehicle.

Therefore, when the waist belt actuation device 50 operates in an emergency or the like, the waist belt insertion portion 24 guided by the guide surface 53 is drawn below the vehicle and moves toward the rear of the vehicle. Also in this case, the waist belt 11B moves rearward on the thigh Mt while suppressing the thigh Mt of the occupant M, and is caught by the upper anterior iliac spine to effectively restrain the occupant M.
Other configurations and operations are similar to those of the seat belt device 10 of the first embodiment.

It should be noted that the present invention is not limited to the above-described respective embodiments, and modifications, improvements, etc. can be made as appropriate.
For example, the waist belt actuation device of the present invention is not limited to the explosive type, but may be a motor drive type combined with a collision prediction radar or a sensor.

  Further, the waist belt actuating device is provided on both sides of the buckle device 40 side and the lap anchor 23 side, simultaneously pulls the waist belt 11B downward of the vehicle, and moves the waist belt 11B toward the rear side of the vehicle, thereby more effectively occupying the occupant. The upper anterior iliac spine of M may be constrained.

Further, the shape of the sliding portion 44 in the guide portions 51, 51A is not particularly limited, and the sliding portion 44 moves within the guide surface 53 of the guide portions 51, 51A while maintaining the inclination angle of the buckle stay 42. If
Further, the lower end portion of the buckle stay 42 is arranged at a position closer to the seat (the inner side in the left-right direction) with respect to the guide portions 51 and 51A, but the present invention is not limited to this, and for example, the support shaft is provided in the guide portions 51 and 51A. It may be attached to 43.

10, 10A, 10B seat belt device 11 seat belt 11A shoulder belt 11B waist belt 12 tongue 23 lap anchor 24 waist belt insertion portion (support portion)
40 Buckle device 41 Buckle 42 Buckle stay 43 Support shaft (shaft part)
44 sliding parts 50, 50A waist belt actuation device 51, 51A guide part 54 front part 55 rear part 60 pretensioner 61 piston (pull-in part)
64 wire member (connecting member)
M crew member Mi ilium (upper anterior iliac spine)
Ms Shoulder Mt Thigh Mw Waist α1 Inclination angle of front part of guide part α2 Inclination angle of rear part of guide part

Claims (10)

A shoulder belt that extends from the shoulders of the occupant to the waist, and a seat belt that has a waist belt that spans both sides of the occupant in the waist and restrains the occupant,
A buckle device capable of engaging a tongue provided on the seat belt,
A lap anchor for fixing the end portion of the seat belt to the vehicle body side,
A three-point seat belt device including:
A support portion provided on at least one of the lap anchor side and the buckle device side of the waist belt,
A waist belt actuating device for pulling the support part downward of the vehicle and moving the support part rearward of the vehicle,
A seat belt device. The support portion is provided on at least one of the wrap anchor and the buckle device,
The seat belt device according to claim 1, wherein the waist belt actuation device includes a guide portion that pulls the support portion downward of the vehicle and moves the support portion toward the rear of the vehicle.   The seat belt device according to claim 2, wherein the guide portion is formed in a linear shape and is inclined downward with respect to a horizontal plane toward the rear of the vehicle. The support portion is one end portion of a buckle stay fixed to the buckle, which is provided in the buckle device,
The inclination angle of the buckle stay with respect to the horizontal plane is set to be larger than the inclination angle of the guide portion with respect to the horizontal plane,
The seatbelt device according to claim 3, wherein the inclination angle of the buckle stay with respect to the horizontal plane is maintained when the support portion is pulled downward of the vehicle and is moved rearward of the vehicle.   The guide portion is connected through an intermediate portion in which a front side portion and a rear side portion having different inclination angles with respect to the horizontal plane are curved, and the front side portion has an inclination angle with respect to the horizontal plane as compared with the rear side portion. The seat belt device according to claim 2, which is large. The support portion is one end portion of a buckle stay fixed to the buckle, which is provided in the buckle device,
The inclination angle of the buckle stay with respect to the horizontal plane is set to be equal to or larger than the inclination angle of the front side portion with respect to the horizontal plane,
The seat belt device according to claim 5, wherein the buckle stay is held at an inclination angle with respect to the horizontal plane when the support portion is pulled downward of the vehicle and is moved rearward of the vehicle.   The waist belt actuating device connects the pull-in portion that pulls in the support portion by the combustion gas pressure of explosives, the shaft portion to which the support portion is attached and moves in the guide portion, and the pull-in portion and the shaft portion. The seat belt device according to claim 2, further comprising a connecting member. The seat cushion of the seat is movable in the front-rear direction with respect to the vehicle,
The seat belt device according to any one of claims 2 to 7, wherein the waist belt actuation device is attached to the seat cushion or a member that moves together with the seat cushion. The lap anchor is fixed to the floor panel,
The waist belt actuation device pulls the waist belt insertion portion, through which the waist belt on the lap anchor side is inserted, as the support portion, and pulls the waist belt downward to move the vehicle toward the rear of the vehicle.
The seat belt device according to claim 1, wherein another buckle belt actuating device for retracting the waist belt is arranged in the buckle device. The waist belt is
When the support portion is pulled downward in the vehicle, the upper surface of the thigh of the occupant is pressed,
The seat according to any one of claims 1 to 9, wherein when the support portion moves rearward of the vehicle, the support portion moves along the upper surface of the thigh so as to hang on the superior anterior iliac spine. Belt device.

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