JP2009107366A - Occupant protection device of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an occupant protection device of a vehicle capable of disposing a lap-belt pre-tensioner in such a manner that the pre-tensioner does not project into an ingress/egress opening in a slide door vehicle. <P>SOLUTION: The vehicle 2 includes: a side sill 44 extending in the longitudinal direction of the vehicle; an upper ingress/egress opening 10 of the side sill 44; a seat 4 near the ingress/egress opening 10; a slide door 24 for opening and closing the ingress/egress opening 10; a projecting portion 52 which is formed at the slide sill 44 so as to project to the inside of a cabin, and accommodates a rail 30 for guiding the slide door 24; and a three-point seat belt device 79 including a shoulder belt 82, a lap belt 84, and a lower support member 102 for supporting the outer end of the cabin of the lap belt 84. In the vehicle 2, the lap-belt pre-tensioner 92 is disposed on the upper surface of the projecting portion 52 so as to extend from an disposition portion of the lower support member 102 to the front of the vehicle, and a groove 54 is formed so as to be fitted on the upper surface of the projecting portion 52 so that the pre-tensioner 92 does not project into the ingress/egress opening 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle occupant protection device including a three-point seat belt.

  The three-point seat belt is composed of a shoulder belt disposed obliquely from the passenger's shoulder to the waist and a lap belt disposed so as to surround the passenger's waist. With regard to the three-point seat belt, a pretensioner for tightening the seat belt in the event of a vehicle collision is often attached to the end of the shoulder belt. When such a technique is employed, the pretensioner is activated in the event of a vehicle collision, whereby the shoulder belt is mainly tightened and the occupant is fixed to the seat.

On the other hand, Patent Document 1 discloses a pretensioner (lap belt pretensioner) connected to an end portion of a lap belt in addition to a pretensioner (shoulder belt pretensioner) connected to an end portion of a shoulder belt. ) Has been proposed. According to the technique of Patent Document 1, when the vehicle collides, both the shoulder belt and the lap belt are tightened by the operation of the two pretensioners, and the occupant can be more reliably protected. The pretensioner for the lap belt can be installed without protruding from the entrance / exit by arranging the lap belt pretensioner along the side sill on the vehicle interior side of the side sill provided on the side of the vehicle floor. In addition, the technique which arrange | positions the pretensioner for lap belts along a side sill is also disclosed by patent documents 2-4.
Japanese Utility Model Publication No. 53-35850 JP 2006-199197 A JP 2006-199198 A JP 2004-359028 A

  By the way, in the case of a sliding door vehicle, it is necessary to provide a rail for guiding the sliding door and a rail box for accommodating the rail. In the case of a low-floor sliding door vehicle, the side sill is provided with a bulging portion that bulges toward the vehicle interior side, and a rail box is accommodated in the bulging portion.

  Thus, when the swell is provided in the side sill, the lap belt pretensioner cannot be installed on the side of the side sill along the side sill. Therefore, it is conceivable to arrange the lap belt pretensioner on the upper surface of the bulging portion, but in this case, there is a problem that the lap belt pretensioner protrudes to the entrance / exit.

  Therefore, an object of the present invention is to provide a vehicle occupant protection device that can be arranged so that a pretensioner for a lap belt does not protrude from a passenger door for a sliding door vehicle.

In order to solve the above-described problem, a vehicle occupant protection device according to the first invention of the present application includes:
Side sills extending in the front-rear direction of the vehicle on both left and right sides of the vehicle floor;
A doorway provided above the side sill;
A seat provided on the floor in the vicinity of the entrance;
A sliding door that is slidable in the front-rear direction of the vehicle and opens and closes at least a part of the entrance;
A bulging portion that is provided on the side sill so as to bulge toward the vehicle interior side in the left-right direction of the vehicle, and accommodates a rail that guides the sliding door;
A seat belt composed of a shoulder belt that is slanted from the shoulder of the occupant to the waist and a lap belt that is straddled across the waist of the occupant, and an upper support member that supports the upper end of the shoulder belt; A three-point seat belt device including a lower support member that supports an outer end portion of the lap belt in the passenger compartment,
A lap belt pretensioner that pulls in the lap belt is disposed on the upper surface of the bulging portion so as to extend from the installation portion of the lower support member toward the front of the vehicle,
A groove portion is formed on the upper surface of the bulging portion so that the lap belt pretensioner does not protrude from the entrance / exit.

A vehicle occupant protection device according to a second invention of the present application is the first invention,
The entrance / exit is partitioned into a front entrance / exit and a rear entrance / exit by a pillar extending upward from the seat vicinity of the side sill,
The sliding door is a door that opens and closes the rear entrance.
The bulging portion is provided so as to extend from the vicinity of the seat toward the rear of the vehicle,
The groove portion is provided at a front end portion of the bulging portion.

A vehicle occupant protection device according to a third invention of the present application is the above first or second invention,
A rail box that opens toward the outside of the passenger compartment and accommodates the rail is accommodated in the bulging portion,
The front end portion of the rail box extends obliquely forward on the vehicle interior side so as to avoid interference with the groove portion.

A vehicle occupant protection device according to a fourth invention of the present application is any one of the first to third inventions,
The groove portion is inclined so as to become lower toward the front.

A vehicle occupant protection device according to a fifth invention of the present application is any one of the first to fourth inventions,
The wall surface of the groove has a shape that allows the lap belt pretensioner to be temporarily fixed at the fixed position by fitting the lap belt pretensioner into a predetermined fixed position of the groove.

A vehicle occupant protection device according to a sixth invention of the present application is the above-described second invention,
A retractor that winds up one end of the shoulder belt, and a shoulder belt pretensioner that pulls in the shoulder belt are disposed above the lap belt pretensioner and outside the passenger compartment, and the pillar vehicle. It is covered from the vehicle interior side by a pillar trim that covers the interior side.

  The sixth aspect of the invention is not limited to the case where the retractor and the shoulder belt pretensioner are separate bodies, and is also applicable to the case where they are integrated.

An occupant protection device for a vehicle according to a seventh invention of the present application is any one of the first to sixth inventions,
A cross member extending in the left-right direction of the vehicle is provided on the vehicle floor,
The end of the cross member abuts on the bulging portion in the vicinity of the groove,
The lap belt pretensioner has a higher rigidity in the vehicle width direction than the bulging portion.

  According to the first invention of the present application, the lap belt pretensioner is fitted in the groove provided on the upper surface of the bulged portion, even when the side sill is provided with the bulged portion that accommodates the rail for the sliding door. As a result, the lap belt pretensioner can be installed so as not to protrude from the entrance.

  According to the second invention of the present application, in a vehicle provided with a slide door that opens and closes the entrance on the rear side of the pillar, the lap belt pretensioner is fitted in the groove portion provided at the front end portion of the bulging portion of the side sill. As a result, the pretensioner for the lap belt can be installed in the space between the seat and the pillar, and there is no hindrance to getting on and off.

  According to 3rd invention of this application, the front-end part of the rail box accommodated in the bulging part of a side sill is extended toward diagonally forward of the vehicle interior side, and it is in the groove part into which the pretensioner for lap belts fits. It is possible to prevent the rail box from interfering.

  According to the fourth invention of the present application, since the groove portion into which the lap belt pretensioner is fitted is inclined so as to become lower toward the front, the front end portion of the lap belt pretensioner projects into the entrance / exit. This can be prevented more reliably.

  According to the fifth invention of the present application, the lap belt pretensioner can be temporarily fixed to the groove only by fitting the lap belt pretensioner into the groove, so that the assembling property can be improved.

  According to the sixth invention of the present application, the retractor that winds up one end of the shoulder belt and the shoulder belt pretensioner (including the case where the retractor and the shoulder belt pretensioner are integrated) include the lap belt pre. Since it is disposed above the tensioner and outside the passenger compartment, it is possible to prevent the pillar from protruding into the passenger compartment due to the provision of the retractor and the shoulder belt pretensioner. Further, since the lap belt pretensioner is fitted into the groove on the upper surface of the bulged portion of the side sill, it can be disposed in a dead space on the side of the seat along the side sill. Therefore, even if a lap belt pretensioner, a shoulder belt pretensioner, and a retractor are installed, it is possible to prevent the vehicle interior space from being compressed.

  According to the seventh invention of the present application, the lap belt pretensioner has higher rigidity in the vehicle width direction as compared with the bulging portion of the side sill, so the rigidity in the vehicle width direction, which is reduced by forming the groove, The lap belt pretensioner can be reinforced by being fitted into the groove. This also prevents damage to the lap belt pretensioner itself.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. In the following description, terms that mean a specific direction (for example, “up”, “down”, “left”, “right”, and other terms including them) are used. In order to facilitate understanding of the invention with reference to the drawings, the present invention should not be construed as being limited by the meaning of these terms.

  FIG. 1 is a schematic diagram showing a vehicle 2 equipped with a vehicle occupant protection device according to an embodiment of the present invention.

  In the present embodiment, the vehicle 2 includes a first row of seats 4, a second row of seats 6, and a third row of seats 8 from the front. In the description herein, “front seat” refers to the seat 4 in the first row, and “rear seat” refers to the seat 6 in the second row and the seat 8 in the third row. To do.

  Side sills 44 extending in the front-rear direction of the vehicle are provided on both sides of the vehicle floor in the left-right direction, and the entrance 10 is provided above the side sill 44. The entrance / exit 10 is formed by a center pillar 18 extending upward from the vicinity of the front seat 4 of the side sill 44, and a front entrance / exit (front seat entrance / exit) 12 and a rear entrance / exit (rear seat entrance / exit). Mouth) 14. The front seat entrance 12 is opened and closed by a hinge door 22, and the rear seat entrance 14 is opened and closed by a slide door 24. The present invention is not limited to a vehicle in which the entrance / exit is divided forward and backward by the center pillar, and is similarly applied to a vehicle having no center pillar and one entrance / exit corresponding to both the front seat and the rear seat. it can.

  As rails for guiding the slide door 24, the upper rail 26 is provided on the side edge portion 40 of the ceiling, the central rail 28 is provided on the belt line 42 on the side surface of the rear portion of the vehicle body, and the lower rail 30 is provided on the side sill 44. Sliders 32, 34, 36 and 38 provided on the slide door 24 are slidably fitted to these rails 26, 28 and 30. Thereby, the slide door 24 is slidable along the front-rear direction of the vehicle while being guided by the rails 26, 28, and 30.

  2 is a cross-sectional view taken along the line ii-ii in FIG. 1 showing the structure of the lower end portion of the slide door. In FIG. 2, illustration of interior members such as a pillar trim 72, which will be described later, is omitted to facilitate understanding of the invention. As shown in FIG. 2, the slide door 24 is provided with a lower arm 50 extending from the lower end portion of the door body 25 toward the diagonally forward side on the vehicle interior side. For example, two sliders 36 and 38 are attached to the tip of the lower arm 50. The sliders 36 and 38 are composed of, for example, rollers that can rotate around an axis extending in the vertical direction, and are fitted to a rail 30 (see FIG. 7) having a U-shaped cross section that opens downward, for example.

  FIG. 3 is a perspective view showing the vicinity of the vehicle interior side of the lower end portion of the center pillar 18. In FIG. 3, in order to facilitate understanding of the invention, illustration of interior members such as a pillar trim 72 described later is omitted. As shown in FIG. 3, the front end portion of the rail 30 is curved toward an obliquely forward side on the vehicle interior side. Thereby, when the sliders 36 and 38 move to the front end portion of the rail 30 and the slide door 24 is closed, the slide door 24 can be pulled into the vehicle interior side. The front end of the rail 30 corresponds to the shape of the lower arm 50 of the slide door 24 and is located in front of the entrance / exit 14 of the rear seat, that is, in the vicinity of the front seat 4.

  FIG. 4 is a perspective view of the side sill as viewed from the outside of the passenger compartment. As shown in FIG. 4, the rail box 46 that accommodates the rail 30 is open toward the outside of the passenger compartment, thereby preventing the lower arm 50 of the slide door 24 from interfering with the rail box 46. The front end portion of the rail box 46 bulges obliquely forward on the vehicle interior side corresponding to the shape of the rail 30.

  5 is a vv cross-sectional view of FIG. 2 showing a side sill. As shown in FIG. 5, the side sill 44 includes an outer panel 62 disposed on the outer side of the passenger compartment, an inner panel 64 disposed on the inner side of the passenger compartment, and a rain force interposed between the outer panel 62 and the inner panel 64. Ment 66. The upper end portion of the outer panel 62, the upper end portion of the inner panel 64, and the upper end portion of the reinforcement 66 are fixed to each other, and a seaming welt 76 is put on the fixed portion. A floor panel 60 is attached to the side surface of the side sill 44 on the vehicle interior side, and a floor mat 70 is laid on the upper surface of the floor panel 60.

  Returning to FIG. 3, the side sill 44 is provided with a bulging portion 52 that bulges toward the vehicle interior side in the left-right direction of the vehicle, and the rail box 46 is accommodated in the bulging portion 52. The bulging portion 52 is provided so as to extend from the vicinity of the front seat 4 toward the rear of the vehicle corresponding to the shape of the rail box 46. On the upper surface of the bulging portion 52, a groove portion 54 is formed in which a lap belt pretensioner 92 described later is fitted so as not to protrude into the entrance 12 of the front seat. The wall surface of the groove portion 54 has a shape corresponding to the shape of the outer peripheral surface of the lap belt pretensioner 92, so that the pretensioner 92 is fitted into a predetermined fixing position of the groove portion 54 so that the pretensioner 92 is fixed. Can be temporarily fixed. The groove 54 extends along the front-rear direction of the vehicle at the front end of the bulging portion 52. The groove part 54 inclines so that it may become low as it goes ahead. The groove portion 54 is formed at the end of the bulging portion 52 on the outside of the passenger compartment. As described above, the front end portion of the rail box 46 protrudes obliquely forward on the vehicle interior side. As a result, a space is formed at the outer end of the vehicle compartment at the front end of the bulging portion 52, and the groove 54 does not interfere with the rail box 46. In the vicinity of the groove portion 54 in the bulging portion 52, an end portion of a cross member 58 extending along the left-right direction of the vehicle on the vehicle floor abuts.

  FIG. 6 is a perspective view showing a three-point seat belt device. As shown in FIG. 6, a three-point seat belt device 79 is attached to the front seat 4. The seat belt 80 of the three-point seat belt device 79 includes a shoulder belt 82 that is stretched obliquely from the occupant's shoulder to the waist and a lap belt 84 that is stretched laterally across the occupant's waist. In the present embodiment, the shoulder belt 82 and the lap belt 84 are integrally connected, but the shoulder belt 82 and the lap belt 84 may be separate. The upper end portion of the shoulder belt 82 is suspended and supported by a belt guide (corresponding to an upper support member in claims) 86 attached to the upper portion of the center pillar 18. The outer end of the shoulder belt 82 is attached to a retractor 110 with a shoulder belt pretensioner. The retractor 110 with a shoulder belt pretensioner is configured by integrating a retractor that winds up the front end of the shoulder belt 82 and a shoulder belt pretensioner that pulls the shoulder belt 82 when the vehicle collides. 7 is a cross-sectional view taken along the line vii-vii in FIG. 6 showing the structure around the lap belt pretensioner. As shown in FIG. 7, the retractor 110 with the shoulder belt pretensioner is attached to the inner panel 19 of the center pillar 18 and is covered from the vehicle interior side by a pillar trim 72 that covers the vehicle interior side of the pillar 18. In the present invention, the retractor and the shoulder belt pretensioner may be separate.

  Returning to FIG. 6, a tongue 88 fixed to the buckle 90 when the occupant wears the seat belt 80 is provided at the end of the lap belt 84 on the vehicle interior side, that is, at the boundary between the lap belt 84 and the shoulder belt 82. It is attached. The outer end of the lap belt 84 is attached to a lap belt pretensioner 92 fixed to a lower anchor 102 (corresponding to a lower support member in claims). As a result, the outer end of the lap belt 84 is supported by the lower anchor 102 via the lap belt pretensioner 92.

  Returning to FIG. 3, the lower anchor 102 is fixed to the upper surface of the bulging portion 52 by welding, bolts or the like on the side of the center pillar 18 or on the side of the rear end portion of the seat 4. The lower anchor 102 has, for example, a substantially L-shaped cross section, but the shape of the lower anchor 102 is not particularly limited. Further, the lower anchor 102 may be fixed to the center pillar 18.

  The lap belt pretensioner 92 is a device that pulls in the lap belt 84 when the vehicle collides. Although various types of devices can be used as the pretensioner 92, for example, an inflator type device is used. The inflator-type pretensioner 92 includes, for example, a substantially cylindrical cylinder 93, a piston (not shown) accommodated in the cylinder 93, and a gas generating agent (not shown) such as explosive accommodated in the cylinder 93. And an ignition device 95 that ignites the gas generating agent, and a wire 94 having one end connected to the piston and the other end connected to the lap belt 84. When a predetermined deceleration of the vehicle 2 is detected by a sensor (not shown) at the time of the collision of the vehicle 2 or the like, a signal is sent from an ECU (Electronic Control Unit) (not shown) to the ignition device 95. When the ignition device 95 receiving this signal ignites the gas generating agent, gas is generated inside the cylinder 93, whereby the piston moves forward, and the wire 94 is instantaneously pulled forward by the movement of the piston. Along with this, the lap belt 84 connected to the wire 94 is pulled downward outside the passenger compartment, and the occupant's waist is securely fixed to the seat 4.

  The cylinder 93 of the pretensioner 92 is made of a material having excellent pressure resistance such as metal so as to be able to withstand the pressure of gas generated inside the cylinder during operation, and has a predetermined thickness or more. Thereby, the cylinder 93 has higher rigidity than the bulging portion 52 in the vehicle width direction. Therefore, the rigidity of the bulging portion 52 that has been reduced by forming the groove portion 54 is reinforced by fitting the cylinder 93 of the pretensioner 92 into the groove portion 54, and the strength of the side sill 44 can be improved.

  The overall shape of the lap belt pretensioner 92 is substantially cylindrical, and the pretensioner 92 is disposed so as to extend from the installation portion of the lower anchor 102 on the upper surface of the bulging portion 52 toward the front of the vehicle. Therefore, the lap belt pretensioner 92 does not protrude from the entrance / exit 14 of the rear seat, so that the entrance / exit of the rear seats 6 and 8 is not hindered. The lap belt pretensioner 92 is fixed to the lower anchor 102 at the rear end portion thereof, and is fitted into the groove portion 54 of the bulging portion 52 from the front end portion to the center portion. As described above, since the groove portion 54 is inclined so as to be lowered toward the front, the front end portion of the pretensioner 92 fitted into the groove portion 54 is prevented from protruding upward of the side sill 44. Accordingly, it is possible to prevent the pretensioner 92 from protruding to the entrance 12 of the front seat while arranging the position of the lower anchor 102 at an appropriate position with respect to the seat 4 in the first row. The boarding / exiting ability and the seat assemblability can be maintained well. In addition, the fitting part to the groove part 54 of the pretensioner 92 is fixed to the upper surface of the bulging part 52 by the bracket 104, for example.

  As shown in FIG. 7, the lap belt pretensioner 92 is covered with a pillar trim 72 from the vehicle interior side. The lower end portion of the pillar trim 72 projects toward the vehicle interior side so as to cover the pretensioner 92, but the projecting portion of the pillar trim 72 is disposed in a dead space on the side of the seat 4 along the side sill 44. The Further, since the retractor 110 with the shoulder belt pretensioner is disposed above the lap belt pretensioner 92 and outside the vehicle compartment, the pillar trim 72 is directed toward the vehicle interior side above the lap belt pretensioner 92. There is no need to overhang. Therefore, even if both the lap belt pretensioner 92 and the shoulder belt retractor 110 with the pretensioner are installed, the vehicle interior space is not compressed.

  FIG. 8 is a perspective view showing a lower end portion of the pillar trim 72. As shown in FIG. 8, the wire 94 of the pretensioner 92 connected to the lap belt 84 and the cover member 96 covering the wire 94 are inserted through the insertion hole 73 formed in the pillar trim 72. The lower end of the pillar trim 72 is formed so as to extend on both sides in the front-rear direction, and both end portions in the front-rear direction of the pillar trim 72 are covered with scarf plates 128, 130. Further, the pillar trim 72 is formed with a cut 124 extending from the insertion hole 73 to the rear end of the pillar trim 72. Accordingly, the wire 94 and the cover member 96 can be inserted into and removed from the insertion hole 73 through the notch 124. Therefore, the pillar trim 72 can be easily attached and detached even when the lap belt pretensioner 92 and the seat belt 80 are attached. can do. However, instead of the configuration in which the insertion hole 73 is formed in the pillar trim 72, the pillar trim 72 is configured by two members, and a configuration in which the wire 94 and the cover member 96 are inserted through a gap provided between the two members is adopted. You can also.

  While the present invention has been described with reference to the above-described embodiments, the present invention is not limited to the above-described embodiments.

1 is a schematic view showing an embodiment of a vehicle to which the present invention is applied. It is ii-ii sectional drawing of FIG. 1 which shows the structure of the lower end part of a slide door. It is a perspective view which shows the vicinity of the lower end part of a center pillar. It is the perspective view which looked at the side sill from the vehicle interior outside. It is vv sectional drawing of FIG. 2 which shows a side sill. It is a perspective view showing a three-point seat belt device. FIG. 7 is a sectional view taken along the line vii-vii in FIG. It is a perspective view which shows the lower end part of a pillar trim.

Explanation of symbols

2: Vehicle, 4: Seat, 10: Entrance / exit, 12: Front entrance / exit, 14: Rear entrance / exit, 18: Pillar, 24: Slide door, 30: Rail, 44: Side sill, 46: Rail box, 52: bulge portion, 54: groove portion, 58: cross member, 72: pillar trim, 79: three-point seat belt device, 80: seat belt, 82: shoulder belt, 84: lap belt, 86: upper support member, 92 : Pre-tensioner for lap belt, 102: Lower support member, 110: Retractor with pre-tensioner for shoulder belt.

Claims (7)

Side sills extending in the front-rear direction of the vehicle on both left and right sides of the vehicle floor;
A doorway provided above the side sill;
A seat provided on the floor in the vicinity of the entrance;
A sliding door that is slidable in the front-rear direction of the vehicle and opens and closes at least a part of the entrance;
A bulging portion that is provided on the side sill so as to bulge toward the vehicle interior side in the left-right direction of the vehicle, and accommodates a rail that guides the sliding door;
A seat belt composed of a shoulder belt that is slanted from the shoulder of the occupant to the waist and a lap belt that is straddled across the waist of the occupant, and an upper support member that supports the upper end of the shoulder belt; A three-point seat belt device including a lower support member that supports an outer end portion of the lap belt in the passenger compartment,
A lap belt pretensioner that pulls in the lap belt is disposed on the upper surface of the bulging portion so as to extend from the installation portion of the lower support member toward the front of the vehicle,
An occupant protection device for a vehicle, wherein a groove portion is formed on an upper surface of the bulging portion so that the lap belt pretensioner does not protrude from the entrance / exit. The entrance / exit is partitioned into a front entrance / exit and a rear entrance / exit by a pillar extending upward from the seat vicinity of the side sill,
The sliding door is a door that opens and closes the rear entrance.
The bulging portion is provided so as to extend from the vicinity of the seat toward the rear of the vehicle,
The vehicle occupant protection device according to claim 1, wherein the groove portion is provided at a front end portion of the bulging portion. A rail box that opens toward the outside of the passenger compartment and accommodates the rail is accommodated in the bulging portion,
3. The vehicle occupant according to claim 1, wherein a front end portion of the rail box extends obliquely forward on the vehicle interior side so as to avoid interference with the groove portion. Protective device.   The vehicle occupant protection device according to any one of claims 1 to 3, wherein the groove portion is inclined so as to become lower toward the front.   The wall surface of the groove part has a shape that allows the lap belt pretensioner to be temporarily fixed at the fixed position by fitting the lap belt pretensioner at a predetermined fixed position of the groove part. The vehicle occupant protection device according to any one of?   A retractor that winds up one end of the shoulder belt, and a shoulder belt pretensioner that pulls in the shoulder belt are disposed above the lap belt pretensioner and outside the passenger compartment, and the pillar vehicle. The vehicle occupant protection device according to claim 2, wherein the vehicle occupant protection device is covered from a vehicle interior side by a pillar trim that covers the interior side. A cross member extending in the left-right direction of the vehicle is provided on the vehicle floor,
The end of the cross member abuts on the bulging portion in the vicinity of the groove,
The vehicle occupant protection device according to any one of claims 1 to 6, wherein the lap belt pretensioner has higher rigidity in the vehicle width direction than the bulging portion.

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