JP2013103624A - Three-point seatbelt device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a three-point seatbelt device, configured to prevent a buckle stay from turning around a turning axis of an anchor at a frontal collision, to improve occupant restraint performance.SOLUTION: The three-point seatbelt device 10 with a pretensioner has a buckle stay 34 which is inclined toward a seat when the pretensioner operates. The device includes an interference structure 80 for interfering from a vehicle front when the pretensioner operates, which is provided on at least one of the buckle stay 34 and a seat-side member 78. The interference structure 80 includes: a plurality of recesses 84 formed on one of the buckle stay 34 and the seat-side member 78; and a projection 86 formed on the other of the buckle stay 34 and the seat-side member 78.

Description

  The present invention relates to a three-point seat belt device for a vehicle, and more particularly to a three-point seat belt device with a pretensioner.

  Japanese Patent Application Laid-Open No. 2004-260688 provides a guide member that guides a support member that supports a buckle in a direction approaching the seat in the lower side and the left and right direction of the vehicle, and provides a guide unit that prevents movement in a direction away from the seat in the upper and left and right direction of the vehicle. A buckle device is disclosed that moves a buckle to the seat side in the vehicle left-right direction by a preloader during deceleration. According to this buckle device, it is possible to suppress a submarine phenomenon in which the occupant's lower back is pulled under the lap belt at the time of a frontal collision of the vehicle.

JP 2005-254395 A

  However, in the above-described prior art, when the seat belt receives a large inertial force from the occupant during a frontal collision of the vehicle, the buckle freely rotates forward of the vehicle around the anchor point. As a result, the amount of forward movement of the occupant increases. Therefore, the above prior art has room for improvement in further improving the occupant restraint performance.

  An object of the present invention is to provide a three-point seat belt device capable of suppressing the buckle stay from rotating forward around the anchor pivot axis of the buckle stay at the time of a frontal collision of the vehicle and improving the occupant restraint performance. It is to provide.

(1) The three-point seat belt device of the present invention that solves the above problems is a three-point seat belt device with a pretensioner that includes a buckle stay that is supported around an anchor shaft so as to be pivotable in the vehicle front-rear direction. . The buckle stay faces the seat side member in the vehicle left-right direction. The buckle stay tilts toward the seat when the pretensioner is activated.
The three-point seat belt device has an interference structure provided on at least one of the buckle stay and the seat side member. The interference structure prevents the buckle stay from turning forward in the vehicle when the buckle stay is tilted toward the seat when the pretensioner is activated.

(2) In the three-point seat belt device according to (1), the seat side member is a side frame of a seat cushion or a belt anchor bracket. The buckle stay is supported by the seat side member.
The configurations of (1) and (2) are common to Examples 1 and 2 of the present invention described later.

(3) In the three-point seat belt device according to (1) or (2), the interference structure includes one or a plurality of recesses or holes formed in one of the buckle stay and the seat side member, the buckle stay and the seat. It consists of the convex part which can be plunged into the said recessed part or hole formed in the other side member.

(4) In the three-point seat belt device according to any one of the above (1) to (3), the surface of the portion of the seat side member facing the buckle stay is the vehicle left-right direction of the buckle stay when the pretensioner is operated. The vehicle is tilted in the left-right direction of the vehicle at the same or substantially the same angle as the tilt angle. Here, “substantially the same angle” means an angle within an angular range in which the interference structure can be engaged even if it deviates from the same angle.

(5) In the three-point seat belt device according to any one of the above (1) to (4), the buckle stay has a buckle at an upper end portion of the buckle stay. It can be swung.
The configurations (3) to (5) are applied to Example 1 of the present invention described later.

(6) In the three-point seat belt device of the above (1) or (2), the interference structure is a vehicle rear side surface of a convex portion formed in front of the buckle stay facing portion of the seat side member, or a seat side member. It consists of the vehicle front side surface of the recessed part formed in the buckle stay opposing part.

(7) In the three-point seat belt device according to (6), the vehicle rear side surface or concave vehicle front side surface of the convex portion of the seat side member, and the vehicle rear side surface or concave portion of the vehicle side of the convex portion of the seat side member A cushioning material is provided on at least one of the side surface of the buckle stay facing the side surface in the vehicle front-rear direction.
The configurations (6) and (7) are applied to Example 2 of the present invention described later.

  According to the three-point seat belt device of the above (1), when the pretensioner is actuated at the time of frontal collision of the vehicle, the seat belt webbing is tensioned, and the buckle stay is tilted to the seat side in the vehicle left-right direction, and the interference structure Can interfere with each other or the buckle stay from the front of the vehicle. As a result, the buckle stay around the anchor shaft center is restrained from turning forward in the vehicle compared to the conventional structure in which the buckle stay can freely rotate around the anchor shaft core. Forward movement is suppressed. As a result, the occupant restraint performance is improved.

According to the three-point seat belt device of the above (2), since the seat side member is the side frame of the seat cushion or the belt anchor bracket, the interference structure can be formed by using a member existing in the past.
Further, since the buckle stay is supported by the seat-side member, the engagement position of the interference structure does not shift even when the position of the seat movable portion is adjusted in the vehicle front-rear direction.

  According to the three-point seat belt device of (3) above, the interference structure has a recess or hole formed in one of the buckle stay and the seat side member, and a projection formed on the other of the buckle stay and the seat side member. Therefore, the interference structure can be formed by pressing at the same time when the sheet side member and the buckle stay are press-molded, and the interference structure can be formed without substantially increasing the cost without increasing the number of parts and man-hours.

  According to the three-point seat belt device of (4) above, the surface of the portion of the seat side member facing the buckle stay is tilted in the vehicle left-right direction, so that when the buckle stay tilts in the vehicle left-right direction The facing surface of the seat side member and the buckle stay can be in surface contact or almost surface contact, and even if the depth and height of the unevenness of the interference structure are reduced compared to the case where the opposing surfaces are separated from each other, the recess or hole of the interference structure And the convex part can be engaged in the vehicle longitudinal direction.

  According to the three-point seat belt device of the above (5), the buckle can swing in the vehicle front-rear direction with respect to the upper end portion of the buckle stay, so that the webbing bias in the tongue plate portion of the seat belt Some jamming can be suppressed. The amount of movement of the buckle forward due to the swing of the buckle is smaller than the amount of movement of the buckle forward due to the rotation of the lower end of the buckle stay. Almost no inhibitory effect.

  According to the three-point seat belt device of (6) above, the interference structure consists of the vehicle rear side surface of the convex portion or the vehicle front side surface of the concave portion, so that the interference structure is press molded simultaneously with the press molding of the seat side member. Thus, the interference structure can be formed without substantially increasing the cost without increasing the number of parts and man-hours.

  According to the three-point seat belt device of the above (7), since the cushioning material is provided, excessive interference between the buckle stay and the seat side member can be suppressed, and webbing at the tongue plate portion of the seat belt can be suppressed. Uneven jamming can be suppressed.

It is the schematic front view seen from the vehicle front before the pretensioner operation | movement of the three-point seatbelt apparatus which concerns on Example 1 of this invention. It is the schematic front view seen from the vehicle front at the time of the pretensioner action | operation of the three-point seatbelt apparatus part of FIG. It is the schematic front view seen from the vehicle front before the pretensioner operation | movement of the three-point seatbelt apparatus which concerns on the modification of Example 1 of this invention. FIG. 4 is a schematic side view of the three-point seat belt device portion of FIG. 3 before the pretensioner is activated. It is a schematic side view of a buckle stay and a buckle of an example in which the buckle can be swung with respect to the upper end portion of the buckle stay in the three-point seat belt device according to the first embodiment of the present invention and the modification thereof. For the three-point seat belt device according to the first embodiment of the present invention and the modified example, the buckle can be swung with respect to the upper end portion of the buckle stay. It is a schematic side view. It is sectional drawing seen from the vehicle front of the buckle stay and seat side member of the three-point seatbelt apparatus which concern on Example 1 of this invention, and its modification, and those vicinity parts. FIG. 8 is a side view of the three-point seat belt device portion of FIG. 7. The front of the vehicle before the pretensioner operation when the interference structure of the buckle stay and the seat side member portion of the three-point seat belt device according to Embodiment 2 of the present invention consists of the side surfaces of the convex portions formed on the seat side member. It is the schematic front view seen from. FIG. 10 is a schematic front view of the three-point seat belt device portion of FIG. 9 as viewed from the front of the vehicle when the pretensioner is activated. FIG. 9A is a plan view of the three-point seat belt device according to the second embodiment of the present invention in which the interference structure shown in FIGS. 9 and 10 is formed of a convex side surface, and FIG. It is a principal part top view in case it consists of a side surface. In the three-point seat belt device according to Embodiment 2 of the present invention, it is a side view when the interference structure is formed of a side surface of a convex portion. It is a side view at the time of providing a shock absorbing material between the side surface of the convex part of a seat side member, and the buckle stay side surface with respect to the three-point seat belt apparatus of FIG. FIG. 3 is a side view of the three-point seat belt device according to the first embodiment of the present invention before the pretensioner operation, and if the interference structure is replaced with the interference structure of the second embodiment, the pre-configuration of the three-point seat belt device according to the second embodiment. It is a side view before tensioner operation.

Hereinafter, a three-point seat belt device according to Embodiment 1 of the present invention, its modification, and Embodiment 2 will be described with reference to FIGS.
FIGS. 1-8 shows Example 1 of this invention and its modification (FIG. 3, FIG. 4 is a modification), FIGS. 9-13 shows Example 2 of this invention. FIG. 14 is applied to the first embodiment of the present invention, its modification, and the second embodiment.
Portions having the same configuration throughout the first embodiment of the present invention, the modification thereof, and the second embodiment are denoted by the same reference numerals. In the figure, “H” indicates the upper side in the vertical direction, “F” indicates the front in the vehicle front-rear direction, and “W” indicates the vehicle left-right direction seat side (occupant side).

[Example 1 and its modifications]
A configuration of a three-point seat belt device according to a first embodiment of the present invention and a modification thereof will be described with reference to FIGS. 1 to 8 and FIG.
The three-point seat belt device 10 according to the first embodiment of the present invention and the modification thereof is a three-point seat belt device for an automobile with a pretensioner. As shown in FIG. 14, the three-point seat belt device 10 includes a webbing 12, a retractor 14 provided at a lower part of the pillar and connected to one end of the webbing 12, and the other end of the webbing 12 connected to a floor or a seat. A fixed anchor plate 16, a shoulder belt anchor 18 that folds the webbing 12 extending upward from the retractor 14, a tongue plate 20 that is provided in the middle of the webbing 12 and is slidably inserted, and a tongue plate 20 And a buckle device 30 that is detachably mounted. The buckle device 30 includes a buckle 32 and a buckle stay 34 that supports the buckle 32.

  With the tongue plate 20 mounted on the buckle 32, the shoulder belt anchor 18, the anchor plate 16, the tongue plate 20 and the buckle device 30 constitute three points of the three-point seat belt device 10. Further, with the tongue plate 20 mounted on the buckle 32, the webbing portion on the shoulder belt anchor 18 side from the tongue plate 20 constitutes the shoulder belt 12a, and the webbing portion on the anchor plate 16 side from the tongue plate 20 is the lap belt 12b. Configure.

  A pretensioner 22 is provided for the webbing 12 to pretension the webbing 12 at the time of a frontal collision of the vehicle and suppress the occupant from moving forward. The pretensioner 22 is provided at the retractor 14 or the anchor plate 16 site. The illustrated example shows a case where the pretensioner 22 is provided in the retractor 14 region. When a signal from a collision sensor is input to an ECU (electronic control unit) and the ECU detects a collision, the pretensioner 22 instantaneously generates a gas based on the signal from the ECU, rotates the reel using this gas as a drive source, and webbing 12 is wound up.

As shown in FIGS. 7 and 8, the buckle 32 is connected to the upper end of the buckle stay 34 and wraps around the upper end of the buckle stay 32. The buckle 32 is a resin member, and the buckle stay 34 is a resin member such as a metal member or fiber reinforced resin.
The buckle stay 34 is composed of one plate or a combination of a plurality of plates. The cross section of the buckle stay 34 is rectangular, and the long side of the rectangle extends in the vehicle front-rear direction and faces the seat 50 in the vehicle left-right direction. The seat 50 includes a lower rail 54 fixed to the vehicle body, and an upper rail 56 movable on the lower rail 54 in the vehicle front-rear direction and adjustable in position, and a movable portion 52 including a member attached to the upper rail 56. The buckle stay 34 is a part of the movable portion 52 of the seat 50 and is attached to the movable portion 52 of the seat 50 so as to be rotatable around the anchor axis 72 in the vehicle front-rear direction.

  The movable portion 52 of the seat 50 includes an upper rail 56, a side frame 58 of a seat cushion attached to the upper rail 56, a seat pan 60 supported by the side frame 58, a cushion pad 62 on the seat pan 60, and an outer skin. 64, and a belt anchor bracket (hereinafter referred to as an anchor bracket) 66 that is attached to the upper rail 56 and is located on the opposite side of the seat 50 from the side frame 58. The lower rail 54, the upper rail 56, the side frame 58, and the anchor bracket 66 are metal members. The side frame 58 and the anchor bracket 66 are fixed to the upper rail 56 by rivets 68.

An anchor shaft 70 extending in the vehicle left-right direction is fixed to the vertical wall of the anchor bracket 66. The buckle stay 34 is pivotally supported by the anchor shaft 70 and is supported so as to be pivotable in the vehicle front-rear direction around an anchor shaft core 72 extending in the vehicle left-right direction.
The amount of rotation of the buckle stay 34 in the vehicle front-rear direction is applied when the buckle stay 34 rotates the stopper pin 74 formed on or fixed to the anchor bracket 66 and the engaging portion 76 formed on the buckle stay 34. Is regulated. The stopper pin 74 protrudes from the anchor bracket 66 toward the buckle stay 34, and the engaging portion 76 faces the stopper pin 74 with a space from the vehicle front-rear direction.

  The distance between the head 70 a of the anchor shaft 70 and the anchor bracket 66 in the vehicle left-right direction is larger than the thickness of the buckle stay 34. The diameter of the anchor shaft insertion hole of the buckle stay 34 is larger than the outer diameter of the anchor shaft 70. As a result, the buckle stay 34 can slightly swing in the left-right direction of the vehicle before the pretensioner 22 is actuated. Before the pretensioner 22 is actuated, a spring washer (not shown) or the like may be interposed between the buckle stay 34 and the anchor bracket 66 in order to hold the buckle stay 34 in the upright posture (the position of the solid line in FIG. 7). . When the pretensioner 22 is operated, pretension is applied to the webbing 12, and the tongue plate 20 and the buckle 32 are pulled toward the seat 50. Therefore, two points in FIG. As indicated by the chain line and as indicated by the solid line in FIG. 2, the buckle stay 34 is inclined toward the seat 50 in the left-right direction of the vehicle.

  The buckle stay 34 faces the seat side member 78 in the vehicle left-right direction. The seat side member 78 is either the anchor bracket 66 or the side frame 58 of the seat cushion that faces the buckle stay 34 in the left-right direction of the vehicle. When the buckle stay 34 is tilted to the seat 50 side when the pretensioner 22 is operated, the buckle stay 34 stops tilting by striking the member 66 or 58 of the seat side member 78 whichever comes first. When the buckle stay 34 comes into contact with the side frame 58 and the tilting stops, the cushion pad 62 and the skin 64 are cut out only at the side portion of the side frame 58 and the front portion of the vehicle so that the buckle stay 34 can directly contact the side frame 58. It is.

The three-point seat belt device 10 is provided on at least one of the buckle stay 34 and the seat side member 78, and when the buckle stay 34 is tilted toward the seat side member 78 by the operation of the pretensioner 22, each other or the buckle stay 34. Has an interference structure 80 that interferes from the front of the vehicle. Here, “to each other” is formed on the buckle stay 34 and a part formed on the seat side member 78 when a part of the interference structure 80 is formed on the seat side member 78 and the other part is formed on the buckle stay 34. The other parts interfered with each other, and “interfering with the buckle stay 34” is when the interference structure 80 is formed on the seat side member 78 and the interference structure 80 interferes with the buckle stay 34. Further, “interfering” includes “when interference is possible”, and “interfering” includes “when engaging and interfering”.
When the pretensioner 22 is not operating, the buckle stay 34 is not inclined toward the seat side member 78, so that the interference structure 80 is not engaged, and the buckle stay 34 is within the range allowed by the stopper pin 74 and the engaging portion 76. The vehicle can be rotated in the longitudinal direction.

When the buckle stay 34 is tilted toward the seat side member 78 by the operation of the pretensioner 22, the interference structure 80 is directly engaged without rotating the buckle stay 34 forward, or the buckle stay 34 is engaged with the seat side member. Inclined to the 78 side and pressed against the seat side member 78 at the pressed position (position A0 in FIG. 8), the inertia force in the forward direction of the vehicle from the occupant is received via the webbing 12, and the buckle stay 34 is moved forward from the pressed position. Engage when it rotates. Once the interference structure 80 is engaged, the buckle stay 34 is prevented from rotating forward from the engagement position. Even if the interference structure 80 is engaged, if the buckle stay 34 moves to the position before tilting in the left-right direction of the vehicle in the direction away from the seat 50 (the position of the solid line of the buckle stay 34 in FIG. 7), The engagement is released.
The structure described above is applied to the first embodiment of the present invention and its modifications, and also to the second embodiment of the present invention described later.

  In the first embodiment of the present invention, as shown in FIGS. 1, 2, 7, and 8, the interference structure 80 includes one or more interference members 80 formed on either the seat side member 78 or the buckle stay 34. It comprises a concave portion (dimple) 84 and a convex portion 86 formed in one of the other of the seat side member 78 and the buckle stay 34 and capable of entering the concave portion 84. In the illustrated example, a case is illustrated in which the concave portion 84 is formed in the seat side member 78 and the convex portion 86 is formed in the buckle stay 34. However, the convex portion 86 may be formed on the seat side member 78, and the concave portion 84 may be formed on the buckle stay 34.

The concave portion 84 or the convex portion 86 is desirably formed by pressing simultaneously with the formation of the sheet side member 78 or the buckle stay 34.
Further, the center of each recess 84 is on the locus of an arc drawn by the protrusion 86 when the buckle stay 34 rotates around the anchor axis 72 forward of the vehicle.
The shape of the concave portion 84 and the convex portion 86 in a side view of the vehicle is, for example, circular, and the diameter of the concave portion 84 is larger than the diameter of the convex portion 86 so that the convex portion 86 can enter the concave portion 84. When the convex portion 86 enters the concave portion 84 and engages with each other in the vehicle front-rear direction, the convex portion 86 interferes with the concave portion 84 in the vehicle front-rear direction, and the buckle stay 34 rotates forward with respect to the seat side member 78. Is blocked.

  When a plurality of recesses 84 are provided, as shown in FIG. 8, the angle A1 around the anchor shaft 72 formed by the adjacent recesses 84 is the inertial force from the occupant in the conventional structure in which the interference structure 80 is not provided. The buckle stay 34 is set smaller than the angle A2 at which the buckle stay 34 rotates around the anchor axis. Thus, in the present invention, when the buckle stay 34 is tilted toward the seat side member 78 by the operation of the pretensioner 22, the buckle stay from the tilt position A0 does not enter the recess 84 at the tilt position A0. When 34 is rotated forward by a small angle A3 (A3 <A2, A3 ≦ A1), the convex part 86 comes to the position of the concave part 84, and the convex part 86 can enter the concave part 84.

  In the modification of the first embodiment, as shown in FIG. 3 and FIG. 4, the interference structure 80 is replaced with the concave portion 84 and the convex portion 86 of the first embodiment, and the convex portion that can enter the through hole 88 and the hole 88. 90. In the modification of the first embodiment, the interference structure 80 includes one or a plurality of holes 88 formed in one of the seat side member 78 and the buckle stay 34, and the other of the seat side member 78 and the buckle stay 34. And a convex portion 90 that can be inserted into the hole 88. In the illustrated example, a case where a hole 88 is formed in the seat side member 78 and a convex portion 90 is formed in the buckle stay 34 is shown.

It is desirable that the hole 88 or the convex portion 90 is formed by press punching or pressing simultaneously with the formation of the sheet side member 78 or the buckle stay 34.
Further, the center of each hole 88 is on the locus of an arc drawn by the convex portion 90 when the buckle stay 34 rotates around the anchor shaft core 72 forward of the vehicle.
The shape of the hole 88 and the convex portion 90 in a side view of the vehicle is, for example, a circle, and the diameter of the hole 88 is larger than the diameter of the convex portion 90 so that the convex portion 90 can enter the hole 88.

  Further, when a plurality of holes 88 are provided, as shown in FIG. 8, the angle A1 around the anchor shaft core 72 formed by the adjacent holes 88 is the inertial force from the occupant in the conventional structure in which the interference structure 80 is not provided. The buckle stay 34 is set smaller than the angle A2 at which the buckle stay 34 rotates around the anchor axis. Accordingly, in the present invention, when the buckle stay 34 is tilted to the seat side member 78 side when the pretensioner 22 is operated, the buckle stay 34 is moved at a small angle from the tilted position even if the convex portion 90 does not enter the hole 88 at the tilted position. If the A3 (A3 <A2, A3 ≦ A1) is rotated forward of the vehicle, the convex portion 90 comes to the position of the hole 88 and the convex portion 90 can enter the hole 88.

  In the first embodiment and the modification thereof, the surface of the facing portion 82 of the seat side member 78 that faces the buckle stay 34 in the vehicle left-right direction is the same as the vehicle left-right direction inclination angle of the buckle stay 34 when the pretensioner 22 is operated. It is desirable to tilt the vehicle in the left-right direction at an angle. By doing so, the buckle stay 34 and the seat side member 78 can come into surface contact with each other at the facing portion 82 when the buckle stay 34 is inclined when the pretensioner 22 is operated.

  Further, in the first embodiment and its modification, the buckle 32 may be swingable in the vehicle front-rear direction with respect to the upper end portion of the buckle stay 34. Any of the structures shown in FIGS. 5 and 6 can be used for the swing structure. The structure of FIG. 5 is a structure in which a semicircular portion 32a formed by projecting downward at the base of the buckle 32 is pivotally supported on the buckle stay 34 by a circular hole portion 32b. The structure of FIG. 6 is a structure in which a semicircular portion 32a formed by projecting downward at the base of the buckle 32 is pivotally supported on the buckle stay 34 by an arc-shaped slit portion 32c extending in an arc shape. 5 and 6 is a structure for suppressing the jamming phenomenon in which the belt webbing 12 is biased in the webbing width direction in the webbing insertion slit 20a (FIG. 14) of the tongue plate 20. FIG.

Next, the operation and effect of the first embodiment of the present invention and its modifications will be described.
When the pretensioner 22 is activated during a frontal collision of the vehicle, pretension is applied to the webbing 12, and the shoulder belt 12a and the lap belt 12b are tensioned. Next, an inertia force forward of the occupant is applied to the webbing 12, and a load to the front of the vehicle is applied to the tongue plate 20 and the buckle 32 via the webbing 12. Conventionally, the buckle stay is rotated forward by a large angle A3 and the positions of the tongue plate 20 and the buckle 32 are moved forward, so that the restraining performance of the occupant has been reduced.

  On the other hand, in the first embodiment of the present invention and its modification, interference occurs by using the buckle stay 34 falling to the seat 50 side when the pretensioner 22 is operated (solid line in FIG. 2 and two-dot chain line in FIG. 7). The structure 80 can be engaged to prevent the buckle stay 34 from rotating forward of the vehicle, thereby improving the occupant restraint performance.

  That is, when the pretensioner 22 is actuated at the time of a frontal collision of the vehicle, the buckle stay 34 is tilted toward the seat 50 in the left-right direction of the vehicle, the concave portion 84 and the hole 88 of the interference structure 80 are engaged with the convex portions 86 and 90. To prevent the vehicle from moving forward. This prevents the buckle stay from pivoting forward around the anchor axis 72 of the buckle stay 34 compared to the conventional structure in which the buckle stay can freely rotate around the anchor axis, and the inertia of the occupant at the time of a frontal collision The forward movement due to is suppressed, and the occupant restraint performance is improved.

Since the anchor shaft 70 is attached to the seat movable portion 52, even if the seat 50 is adjusted in the vehicle front-rear direction, the engagement of the interference structure 80 is not shifted or cannot be engaged.
Further, since the seat side member 78 is the side frame 58 or the anchor bracket 66 of the seat cushion fixed to the upper rail 5, the interference structure 80 can be configured using a member that has existed conventionally. There is no cost increase or major design change as in the case of using a new member.
The above operations and effects are applied not only to the first embodiment of the present invention and its modifications, but also to the second embodiment.

  In the first embodiment of the present invention and its modification, the interference structure 80 includes one or more recesses 84 or holes 88 formed in one of the buckle stay 34 and the seat side member 78, the buckle stay 34 and the seat side member. Since the convex portion 86 or 90 that can be inserted into the concave portion 84 or the hole 88 is formed on the other side of 78, the interference structure 80 can be formed by pressing simultaneously when the sheet side member 78 and the buckle stay 34 are press-molded. . As a result, the interference structure 80 can be formed without substantially increasing the cost without increasing the number of parts and man-hours.

  In the first embodiment of the present invention and its modification, the surface of the seat side member 78 facing the buckle stay is the same as the vehicle left-right direction inclination angle of the buckle stay 34 when the pretensioner 22 is operated. When the buckle stay 34 is tilted in the left-right direction of the vehicle, the opposing surfaces of the seat side member 78 and the buckle stay 34 can come into surface contact with each other, and the unevenness of the interference structure 80 can be reduced compared to the case where the opposing surfaces are separated. Even if the depth and height are reduced, the engagement between the convex portions 86 and 90 and the concave portion 84 or the hole 88 in the vehicle front-rear direction is possible.

  In the first embodiment of the present invention and its modification, when the buckle 32 can swing in the vehicle front-rear direction with respect to the upper end of the buckle stay 34, the seat belt webbing 12 in the tongue plate 20 slit is provided. Can be suppressed and belt jamming can be suppressed.

[Example 2]
Next, a three-point seat belt device 10 according to Embodiment 2 of the present invention will be described with reference to FIGS. In the description of the first embodiment and the modifications thereof, the configuration, operation, and effects that are common to the second embodiment are also applied to the second embodiment.

First, the configuration of the second embodiment will be described.
In the three-point seat belt device 10 according to the second embodiment, as shown in FIGS. 9 to 11, 12, and 13, the interference structure 80 has a buckle stay facing portion 82 ( As shown in FIG. 11 (B), the seat-side member 78 is formed on the vehicle rear side surface 92a of the convex portion 92 formed at the front side of the vehicle at a position corresponding to A0 in FIG. It consists of the vehicle front side surface 94a of the recessed part 94 formed in the buckle stay opposing part 82 of this. The seat side member 78 is the side frame 58 or the anchor bracket 66. 12 and 13 show the case where the seat side member 78 is the side frame 58. FIG. The buckle stay facing portion 82 of the side frame 58 does not need to be tilted in the vehicle left-right direction as shown in FIG.

  The pretensioner 22 is actuated during a frontal collision of the vehicle and the buckle stay 34 falls to the seat 50 side, and when the vehicle tilts, the buckle stay 34 hits the buckle stay facing portion 82 of the seat side member 78. In this state, the vehicle front side surface of the buckle stay 34 and the vehicle rear side surface 92a of the convex portion 92 of the seat side member 78 or the vehicle front side surface 94a of the concave portion 94 can interfere with each other in the vehicle front-rear direction. The forward rotation of the vehicle is restricted.

  As shown in FIG. 13, a cushioning material 96 may be provided on at least one of the side surfaces 92 a and 94 a of the convex portion 92 or the concave portion 94 of the seat side member 78 and the side surface of the buckle stay 34 facing it. . The buffer material 96 is made of rubber, resin, or an impact absorbing material other than rubber or resin.

Next, operations and effects of the second embodiment will be described.
In the second embodiment, the interference structure 80 includes the vehicle rear side surface 92 a of the convex portion 92 formed on the seat side member 78 or the vehicle front side surface 94 a of the concave portion 94 formed on the seat side member 78. The interference structure can be press-molded at the same time as 78 is press-molded. As a result, the interference structure 80 can be formed without substantially increasing the cost without increasing the number of parts and man-hours.

  In the second embodiment, when the cushioning material 96 is provided on at least one of the side surfaces 92a and 94a of the convex portion 92 or the concave portion 94 of the seat side member 78 and the side surface of the buckle stay 34, the front side collision of the vehicle The interference of the strength between the buckle stay 34 and the seat side member 78 can be suppressed, and the impact from the seat belt webbing 12 to the occupant's chest or waist can be mitigated. Further, jamming, which is a deviation of the webbing 12 at the tongue plate 20 of the seatbelt webbing 12, can be suppressed.

10 Three-point seat belt device 22 Pretensioner 32 Buckle 34 Buckle stay 56 Upper rail 58 Side frame 66 Belt anchor bracket 72 Anchor shaft core 78 Seat side member 80 Interference structure 82 Seat side member buckle stay facing portion 84 Concave portion 86 Convex portion 88 Through-hole 90 Convex part 92 Convex part 92a Convex part side surface 94 Concave part 94a Concave part side surface 96 Buffer material

Claims (7)

It includes a buckle stay supported around the anchor shaft so as to be pivotable in the vehicle longitudinal direction. The buckle stay faces the seat side member in the vehicle left-right direction, and the buckle stay tilts toward the seat when the pretensioner is activated. A three-point seat belt device with a pretensioner,
Three points having an interference structure that is provided on at least one of the buckle stay and the seat side member and prevents the buckle stay from rotating forward of the vehicle when the buckle stay is tilted to the seat side when a pretensioner is activated. Type seat belt device.   The three-point seat belt device according to claim 1, wherein the seat side member is a side frame of a seat cushion or a belt anchor bracket, and the buckle stay is supported by the seat side member.   The interference structure enters one or a plurality of recesses or holes formed in one of the buckle stay and the seat side member and the recess or hole formed in the other of the buckle stay and the seat side member. The three-point seat belt device according to claim 1 or 2, comprising a convex portion that can be used.   The surface of the portion of the seat side member facing the buckle stay is inclined in the vehicle left-right direction at the same angle or substantially the same angle as the vehicle left-right direction tilt angle of the buckle stay when the pretensioner is operated. The three-point seat belt device according to any one of claims 1 to 3.   5. The buckle according to claim 1, wherein a buckle is provided at an upper end portion of the buckle stay, and the buckle can swing in the vehicle front-rear direction with respect to the upper end portion of the buckle stay. Three-point seat belt device.   The interference structure includes a vehicle rear side surface of a convex portion formed on the front side of the buckle stay facing portion of the seat side member or a vehicle front side surface of a concave portion formed on the buckle stay facing portion of the seat side member. The three-point seat belt device according to claim 1 or 2.   At least one of the vehicle rear side surface of the convex portion of the seat side member or the vehicle front side surface of the concave portion and the side surface of the buckle stay facing the vehicle rear side surface of the convex portion or the vehicle front side surface of the concave portion in the vehicle front-rear direction. The three-point seat belt device according to claim 6, wherein a cushioning material is provided on either side.

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