JP2018158686A - Three-point type seat belt device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a three-point type seat belt device to effectively eliminate slack of a webbing during the operation of a pretensioner and effectively constrain an occupant by regulating movement of the webbing with respect to a tongue during the constraint of the occupant.SOLUTION: In a three-point type seat belt device S1, a tongue 40 has a first wall part 62A and a roller 80. A webbing 20 is wounded around the roller 80 to be folded back in an attached state. The roller 80 is not relatively moved with respect to the first wall part 62A by a load imposed from the webbing 20 during the operation of a pretensioner, but is relatively moved with respect to the first wall part 62A by a larger load imposed from the webbing 20 during the constraint of an occupant and locks the webbing 20 by holding the webbing 20 between the roller and the first wall part 62A.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a three-point seat belt device.

  Patent Document 1 discloses a so-called locking tongue. In this locking tongue (clamped tongue plate), both sides of the clamp bar around which the webbing (seat belt) is wound are arranged in the insertion grooves formed on the opposite sides of the frame body. The clamp bar is locked at a predetermined position. When a force greater than the set value is applied to the webbing in an emergency, the shear pin is cut and the clamp bar moves to one end side along the insertion groove, and the webbing is held between the clamp bar and the guide bar at one end of the frame. It is like that.

Japanese Patent Application Laid-Open No. 08-040195

  However, in the above technique, since the webbing is wound around the clamp bar locked by the shear pin, the webbing pull-in efficiency during the pretensioner operation is lowered due to the sliding friction between the clamp bar and the webbing. There are cases where the sagging of the webbing cannot be effectively removed due to a decrease in the pulling efficiency.

  In particular, when the pretensioner device is an electric motor type, the pulling force is weak compared to the explosive type, which is disadvantageous.

  An object of the present invention is to provide a three-point seat belt device in which sagging of webbing is effectively removed when a pretensioner is operated, and movement of the webbing relative to the tongue is restricted when the occupant is restrained, so that the occupant is effectively restrained. That is.

  The three-point seat belt device according to claim 1 is wound so that the webbing is folded in a mounted state in which the pretensioner device, the wall, and the seat belt are mounted on the seated occupant, and the pretensioner is operated. Depending on the load applied from the webbing, the webbing does not move relative to the wall part, and when the occupant is restrained, the load applied from the webbing moves relative to the wall part to sandwich the webbing between the wall part. And a tongue having a roller for locking the webbing.

  In the three-point seat belt device according to the first aspect, the tongue includes a wall portion and a roller. The roller is wound so that the webbing is folded in the mounted state. The roller does not move relative to the wall portion depending on the load applied from the webbing when the pretensioner is activated, and moves relative to the wall portion depending on the load applied from the webbing when the occupant is restrained. The webbing is locked by pinching.

Therefore, when the pretensioner is operated, the roller does not move relative to the wall portion and functions as a roller, and friction at the folded portion of the webbing (the portion folded around the roller) is reduced. Therefore, the webbing moves smoothly between the shoulder belt side and the lap belt side across the folded portion, and the sagging of the webbing is effectively removed.
Thereafter, when the occupant is restrained, the roller is moved relative to the wall portion, and the webbing is sandwiched between the wall portion and the roller to lock the webbing.

  The three-point seat belt device according to claim 2, wherein the tongue supports one end of the lap belt in the seat width direction and one side of the lap belt in the seat width direction in the attached state. It has a support part which supports the sheet width direction one side edge part of a shoulder belt in the position spaced apart to the sheet upper side rather than the position which supports an edge part.

In the three-point seat belt device according to claim 2, the tongue has a support portion. The support portion, in the mounted state, supports one end of the lap belt in the seat width direction, and the shoulder belt seat at a position spaced above the seat from the position supporting the one end of the lap belt in the seat width direction. Supports one end in the width direction.
For this reason, the submarine phenomenon can be suppressed at the seat width direction one side end portion of the lap belt while the support position of the shoulder width one side end portion of the shoulder belt is set to an appropriate height position for restraining the upper body. It can be set to a low position.
Furthermore, since the position of the folded portion of the webbing can be set to a low position along with setting the one side end of the lap belt in the seat width direction to a low position, the folded angle of the folded portion is brought close to an angle close to 180 degrees. Can do. Therefore, the roller can be relatively moved in an appropriate direction when the occupant is restrained, and the webbing can be locked at an early stage when the occupant is restrained.

  A three-point seat belt device according to a third aspect of the present invention is the three-point seat belt device according to the second aspect, further comprising a buckle provided on one side in the seat width direction of the vehicle seat and having a disengagement button. An extension that can be held at a position above the seat with respect to the buckle and that allows the occupant to operate the disengagement button is provided on the support portion.

In the three-point seat belt device according to claim 3, the support portion is held at a position above the seat with respect to the buckle in the mounted state, and the detachment button of the buckle is pushed to the support portion by the operation of the occupant. An extension that can be used is provided.
For this reason, when the seat belt is to be detached from the mounted state, the occupant operates the extension provided on the support portion, so that the seat belt can be released by indirectly pressing the release button provided on the buckle. . Therefore, even when the height of the buckle is set low, it is not necessary to reach to the release button of the buckle set low, and the extension of the support part held at the position above the seat is operated. It's easy to use. Further, as the buckle is set to a low position, the support position of the one side end portion of the lap belt in the seat width direction can be set to a low position. Setting the support position of the one end of the lap belt in the sheet width direction to a low position advantageously works on the suppression of the submarine phenomenon and the locking by the rollers as described above.

  The three-point seat belt device according to claim 4, wherein the tongue includes a second wall portion facing the wall portion, and the wall portion and the wall portion according to any one of claims 1 to 3. The gap with the second wall portion becomes narrower toward the upper side of the seat at the time of wearing, and when the occupant is restrained, the roller relatively moves and fits between the wall portion and the second wall portion. Lock the webbing.

  In the three-point seat belt device according to claim 4, the tongue has a second wall portion facing the wall portion. The gap between the wall portion and the second wall portion becomes narrower toward the upper side of the seat at the time of mounting, and when the passenger is restrained, the roller relatively moves and fits between the wall portion and the second wall portion. The webbing is locked by this. For this reason, it is not necessary to provide a structure like the insertion groove of patent document 1, and a locking tongue can be implement | achieved with a simple structure.

  A three-point seat belt device according to a fifth aspect of the present invention is the three-point seat belt device according to the fourth aspect, wherein a portion of the webbing on the side of the shoulder belt with respect to the folded portion which is a portion folded back by the roller is between the roller and the wall portion. And the portion of the webbing that is closer to the lap belt than the folded portion passes between the roller and the second wall, and when the passenger is restrained, the roller By fitting between the second wall portion and the second wall portion, the webbing is sandwiched between the wall portion and the second wall portion.

  6. The three-point seat belt device according to claim 5, wherein a portion on the shoulder belt side of the folded portion in the webbing passes between the roller and the wall portion, and a portion on the lap belt side of the folded portion in the webbing. Passes between the roller and the second wall. When the occupant is restrained, the roller fits between the wall portion and the second wall portion, thereby sandwiching the webbing between the wall portion and the webbing between the second wall portion. Since the webbing is clamped not only between the wall part but also between the second wall part, the webbing can be effectively locked.

  A three-point seat belt device according to a sixth aspect of the present invention is the three-point seat belt device according to the fifth aspect, wherein the tongue is on a side opposite to a surface of the webbing that is in contact with the roller of the lap belt side portion of the folded portion. There is an auxiliary roller around which the surface is wound.

  In the three-point seat belt device according to the sixth aspect, the tongue has an auxiliary roller. The auxiliary roller is wound around the surface of the portion closer to the lap belt than the folded portion of the webbing (the surface opposite to the surface in contact with the roller). Thereby, friction with webbing and the 2nd wall part can be suppressed in a wearing state. Therefore, according to the three-point seat belt device of the sixth aspect, the webbing can be effectively locked by being clamped at two locations, and the slack of the webbing is effectively removed when the pretensioner is operated.

  As described above, the present invention has an excellent effect that the sagging of the webbing is effectively removed when the pretensioner is operated, and the movement of the webbing relative to the tongue is restricted when the occupant is restrained, so that the occupant is effectively restrained. .

It is the front view seen from the seat front which shows the wearing state of the seatbelt device concerning a 1st embodiment typically. It is the side view seen from the seat side (sheet width direction one side) which shows the wearing state of the seatbelt device concerning a 1st embodiment. FIG. 3 is an enlarged side view of a peripheral structure of a tongue and a buckle in FIG. 2. FIG. 4 is a cross-sectional view (an enlarged cross-sectional view taken along line 4-4 in FIG. 2) showing a state in which the tongue and the buckle are cut in the vertical direction of the tongue in the mounted state. (A) is sectional drawing in the longitudinal direction intermediate part of a support part which shows a mode that the tongue was cut | disconnected by the plane orthogonal to a tongue up-down direction (5A-5A sectional drawing of FIG. 4), (B) is a tongue roller It is sectional drawing in the vicinity of the lower end of the support part which shows a mode cut | disconnected to the axial direction (5B-5B sectional view taken on the line of FIG. 4). FIG. 5 is a cross-sectional view corresponding to FIG. 4 showing a state in which the extension is operated in the mounted state. FIG. 5 is a cross-sectional view corresponding to FIG. 4 illustrating a state in which the webbing is locked in the seat belt device according to the first embodiment. It is sectional drawing (sectional drawing corresponding to FIG. 4) which shows a mode that the tongue and buckle in the mounting state of the seatbelt apparatus which concerns on 2nd Embodiment were cut | disconnected to the tongue vertical direction. It is sectional drawing corresponding to FIG. 8 which shows the state by which the webbing was locked in the seatbelt apparatus which concerns on 2nd Embodiment.

[First Embodiment]
Hereinafter, the three-point seat belt device S1 according to the first embodiment of the present invention will be described with reference to FIGS.

  Note that an arrow FR appropriately shown in each drawing indicates a front side in the front-rear direction of the seat, an arrow UP indicates an upper side in the seat vertical direction, an arrow W1 indicates one side in the seat width direction, and an arrow W2 indicates the other side in the seat width direction. Yes. Also, in the following description, when using the front / rear, top / bottom, width direction one side, and the other side direction, the front / rear direction of the seat, the top / bottom direction of the sheet, the one side of the sheet width direction, and the other side are indicated. And

  The three-point seat belt device S1 according to the first embodiment is applied to a vehicle seat 10 which is a first row right seat (driver seat in a right-hand drive vehicle). Therefore, in this embodiment, the vehicle front and the seat front, the vehicle upper and the seat upper, the vehicle width direction inner side and the seat width direction one side, and the vehicle width direction outer side and the seat width direction other side coincide with each other.

  The vehicle seat 10 includes a seat cushion 12 and a seat back 14 connected to the rear portion of the seat cushion 12.

  As shown in FIG. 1, the three-point seat belt device S1 includes a webbing 20 for restraining an occupant. The webbing 20 is formed in a long belt shape having flexibility using a material such as a chemical fiber. One end of the webbing 20 in the longitudinal direction is locked to a spool 32A of a retractor 32 fixed to a lower end of a B pillar (not shown). The intermediate portion in the longitudinal direction of the webbing 20 is inserted and folded back through a shoulder anchor 34 (slip joint) attached to the upper part of the B pillar, and the other longitudinal end portion of the webbing 20 is near the lower end of the B pillar. The anchor member 36 is fixed.

  A tongue 40 is attached to a portion of the webbing 20 between the shoulder anchor 34 and the anchor member 36 so as to be movable in the longitudinal direction of the webbing 20. The tongue 40 is configured to be connectable to a buckle 70 provided on one side of the vehicle seat 10 in the seat width direction (inner side in the vehicle width direction). When the tongue 40 is connected to the buckle 70, the occupant seated on the vehicle seat 10 is in a state of wearing a seat belt (hereinafter referred to as “wearing state”). In the mounted state, a portion of the webbing 20 between the tongue 40 and the shoulder anchor 34 becomes a shoulder belt 20S that restrains the upper body of the occupant, and a portion of the webbing 20 between the tongue 40 and the anchor member 36 restrains the occupant's waist. Lap belt 20L. Detailed structures of the tongue 40 and the buckle 70 will be described later.

  The retractor 32 is a winding device that winds up and stores the webbing 20 on the spool 32A. The retractor 32 locks the rotation of the spool 32A and pulls out the webbing 20 when it is detected that the acceleration of the vehicle is equal to or greater than a predetermined value or the pulling acceleration of the webbing 20 from the spool 32A is equal to or greater than a predetermined value. Has a locking mechanism (not shown). The retractor 32 has a known pretensioner mechanism (not shown). The pretensioner mechanism is an explosive type, and is configured to forcibly wind the webbing 20 around the spool 32A by rotating the spool 32A by the ignition of the explosive when a frontal collision of the vehicle is detected. . The pretensioner mechanism is not limited to the explosive type but may be an electric motor type. The retractor 32 has a known pre-crash seat belt mechanism (not shown). The pre-crash seat belt mechanism is configured to forcibly wind the webbing 20 around the spool 32A by rotating the spool 32A by the driving force of the motor when a frontal collision or side collision of the vehicle is predicted. In the present embodiment, the retractor 32 corresponds to the “pretensioner device” of the present invention.

  Next, the detailed structure of the tongue 40 and the buckle 70 will be described with reference to FIGS.

  The tongue 40 includes a support portion 50 that slidably supports the webbing 20, and an insertion portion 60 that is integrated with the support portion 50.

  As shown in FIG. 4, the support portion 50 includes a long body portion 51 and a similarly long extension 52. The main body 51 and the extension 52 are assembled in a state where the longitudinal directions of the main body 51 and the extension 52 coincide with each other. Thereby, the support part 50 is formed in the longitudinal cylinder shape of cross-sectional substantially rectangular shape through which the webbing 20 passes.

  Hereinafter, the longitudinal direction of the substantially rectangular cross section shown in FIG. 5A is referred to as the tongue width direction, the short direction is referred to as the tongue thickness direction, and the longitudinal direction of the support portion 50 (perpendicular to the paper surface of FIG. 5A). Direction) is called the tongue vertical direction.

  As shown in FIG. 5A, the main body 51 includes a flat plate-like back wall portion 53 in which the plate thickness direction is directed to the tongue thickness direction, and the tongue thickness direction from the vicinity of both ends of the back wall portion 53 in the tongue width direction. A pair of side wall portions 54 and 55 projecting to one side (right side in FIG. 5). The pair of side wall portions 54 and 55 face each other in the tongue width direction, and guide grooves 44A and 45A for supporting the extension 52 so as to be relatively movable are formed on the surfaces of the pair of side wall portions 54 and 55 facing each other. Has been. An extension 52 is attached between the pair of side wall portions 54 and 55 so that the tongue 52 can move in the vertical direction. In the mounted state, the main body 51 is disposed on the other side in the seat width direction (outside in the vehicle width direction), and the extension 52 is disposed on one side in the seat width direction.

  As shown in FIG. 5 (A), the extension 52 has a substantially U-shaped cross-section opened to the main body 51 side in the tongue thickness direction and forms a part of the appearance of the support portion 50. And a sliding portion 57 that extends from both ends of the outer width portion 56 in the tongue width direction toward the outer side in the tongue width direction and is accommodated in the guide grooves 44A and 45A of the main body portion 51. Further, a plurality of (two in the first embodiment) ribs 58 project from the external appearance portion 56 in the tongue thickness direction toward the main body 51 side so as to extend in the tongue vertical direction. In the cross section shown in FIG. 5A, a gap through which the webbing 20 can pass is formed between the tip of the rib 58 and the back wall portion 53.

  As shown in FIG. 4, at the upper end of the support portion 50, a shoulder-side outlet 50 </ b> S is supported by the upper end 51 </ b> T of the main body 51 and the upper end 52 </ b> T of the extension 52. Is formed. On the other hand, in the vicinity of the lower end 51B of the main body 51, a lap side outlet 50L is formed to support the one side end of the lap belt 20L in the sheet width direction. The distance between the shoulder side outlet 50S and the lap side outlet 50L (the distance between the center portions of the outlets 50S and 50L) is 1.2 to 4 times the width of the webbing 20, and in the first embodiment, About 3 times. However, for example, the width of the webbing 20 is 47 mm, but the distance between the outlets 50S and 50L may be about 65 mm to 70 mm.

  As shown in FIG. 4, the lower end 51 </ b> B of the main body 51 and the lower end 52 </ b> B of the extension 52 coincide with each other in the vertical position of the tongue. When the extension 52 is operated downward from this state, as shown in FIG. 6, the lower end 52 </ b> B of the extension 52 protrudes downward in the tongue vertical direction from the lower end 51 </ b> B of the main body 51. .

  A part of the insertion portion 60 is embedded in the vicinity of the lower end 51 </ b> B of the main body portion 51. Thereby, the main-body part 51 and the insertion part 60 are integrated. A portion of the insertion portion 60 that protrudes downward from the main body portion 51 is a portion that is inserted into a later-described insertion port 70A of the buckle 70, and this portion is a flat plate with the plate thickness direction directed to the tongue thickness direction. 60A of latching holes are formed.

  As shown in FIGS. 2 and 3, the buckle 70 is attached to the tip of the stay 74. The base end portion of the stay 74 can be rotated by a support shaft to a seat upper rail (not shown, a rail member that moves in the front-rear direction of the seat together with the vehicle seat 10 in accordance with the position adjustment of the vehicle seat 10 in the front-rear direction). It is attached. As a result, the stay 74 is rotatable about an axis in the seat width direction around the anchor position A set on the seat upper rail. The stay 74 is formed in a substantially L shape when viewed from the sheet width direction. As a result, the stay 74 has the longitudinal direction facing the substantially front side of the seat at the base end portion and the longitudinal direction facing the substantially upper side of the seat at the distal end portion.

  As shown in FIG. 4, a slit-like insertion port 70 </ b> A is formed on the upper surface of the buckle 70. The opening direction of the insertion port 70A coincides with the direction in which the tip of the stay 74 faces. When the insertion portion 60 of the tongue 40 is inserted into the insertion port 70A from the opening direction of the insertion port 70A, a latch fitting (not shown) provided inside the buckle 70 enters the locking hole 60A of the insertion portion 60. Engage. Thereby, the insertion part 60 is latched by the buckle 70.

  As shown in FIG. 1 and FIG. 2, in the mounted state, the tongue vertical direction faces the direction along the seat vertical direction, and the lap side outlet 50L and the shoulder side outlet 50S of the support portion 50 Will be separated in the direction. Accordingly, one end of the lap belt 20L in the seat width direction is supported by the wrap side outlet 50L of the support portion 50, and one end of the lap belt 20L in the seat width direction is supported by the shoulder side outlet 50S of the support portion 50. The one end of the shoulder belt 20 </ b> S in the sheet width direction is supported at a position spaced above the sheet from the position where the sheet is positioned.

  As shown in FIG. 4, a disengagement button 72 is provided on the upper surface of the buckle 70 on one side in the seat width direction (inner side in the vehicle width direction) of the insertion port 70 </ b> A. The dissociation button 72 is configured to be pressed in the same direction as the insertion direction of the insertion portion 60 into the insertion port 70A (hereinafter simply referred to as “insertion direction”). When the release button 72 is pressed, the engagement state of the latch metal with respect to the locking hole 60A is released, and the locking of the insertion portion 60 by the buckle 70 is released.

  The disengagement button 72 is operated when the extension 52 of the support portion 50 of the tongue 40 is operated in a state where the tongue 40 and the buckle 70 are connected, and the extension 52 moves relative to the main body portion 51 downward in the tongue vertical direction. It is provided at a position where the lower end 52B of the extension 52 abuts. Therefore, in the mounted state, as shown by the arrow in FIG. 6, the occupant can indirectly press the disengagement button 72 by operating the upper end 52T of the extension 52 downward with a finger. .

  As shown in FIG. 4, a roller 80 is provided at the lap side outlet 50 </ b> L of the support portion 50. The roller 80 is rotatable with respect to the main body 51 with the tongue width direction as an axial direction. The roller 80 is wound around the back side of the webbing 20 so that the webbing 20 is folded back at the turn-up portion 20V. As shown in FIG. 5B, the roller 80 is integrally formed of a synthetic resin, and includes a main body portion 80A with which the webbing 20 contacts, and a shaft portion 80B that is pivotally supported on both sides in the axial direction of the main body portion 80A. It is equipped with. Both the main body portion 80A and the shaft portion 80B have a cylindrical shape, and the shaft portion 80B has a smaller diameter than the main body portion 80A.

  As shown in FIG. 5B, the shaft portion 80 </ b> B is supported by a pair of metal shaft support portions 61 fixed to the main body portion 51 of the support portion 50. The pair of shaft support portions 61 are connected by the connecting portion 62 in the tongue width direction. As a result, the pair of shaft support portions 61 and the connecting portion 62 have a U-shaped cross section.

  As shown in FIG. 4, the connecting portion 62 is located on one side of the tongue 80 in the tongue thickness direction (the right side in FIG. 4, one side in the sheet width direction when mounted). The connecting portion 62 is formed in a flat plate shape. While the plate thickness direction is substantially directed to the tongue thickness direction, in detail, the tongue thickness direction is on the other side (in the tongue thickness direction, the direction closer to the roller 80). ).

  Further, a metal facing plate portion 64 facing the connecting portion 62 is fixed to the other side of the tongue 62 in the tongue thickness direction (left side in FIG. 4). The counter plate portion 64 is formed in a flat plate shape, and in general, the plate thickness direction is directed to the tongue thickness direction, but in detail, the counter plate portion 64 is inclined toward one side of the tongue thickness direction toward the upper side of the tongue vertical direction.

  Thereby, the space | interval of the surfaces where the connection part 62 and the opposing board part 64 face is gradually narrowed as it goes to the tongue up-down direction upper side. In the mounted state, the vertical direction of the tongue is directed in the direction along the vertical direction of the seat, so that the interval between the surfaces becomes narrower toward the upper side of the seat at the time of mounting. The surface of the connecting portion 62 on the opposing plate portion 64 side (the surface on the other side in the tongue thickness direction) is the first wall portion 62A as a “wall portion”, and the surface of the opposing plate portion 64 on the connecting portion 62 side (the tongue thickness direction). One side surface) is the second wall portion 64A.

  As shown in FIG. 4, the webbing 20 passes between the roller 80 and the first wall portion 62 </ b> A on the shoulder belt 20 </ b> S side with respect to the folded portion 20 </ b> V by the roller 80. On the other hand, the webbing 20 passes the tang belt lower side of the opposing plate part 64 on the lap belt 20L side from the folded part 20V by the roller 80, and passes between the roller 80 and the second wall part 64A. Not.

  As shown in FIG. 4, the connecting portion 62 is integrally formed as a part of the insertion portion 60.

  As shown in FIG. 3, the axial direction of the roller 80 is inclined with respect to the direction perpendicular to the longitudinal direction of the support portion 50. Specifically, in the mounted state of the roller 80, the shaft portion 80B on the front side of the seat is inclined so as to be positioned below the support portion 50 (downward in the tongue vertical direction) with respect to the shaft portion 80B on the rear side of the seat. Yes. Thereby, the webbing 20 is folded back so as to have an angle (see θ in FIG. 3) when viewed from the thickness direction of the webbing 20.

By the way, when a load is generated on the webbing 20 such as when the pretensioner mechanism or the pre-crash seat belt mechanism of the retractor 32 is activated (hereinafter also referred to as “pretensioner operation”) or when the occupant is restrained, the webbing 20 A load from the webbing 20 is applied to the roller 80 wound around in a folded state. At this time, the magnitude of the load applied to the roller is larger when the occupant is restrained than when the pretensioner is activated. As an example, a load of about 4 kN is assumed when the pretensioner is operated, and a load of about 8 kN is assumed when the occupant is restrained.
Under such assumption, the shaft portion 80B of the roller 80 can withstand the load applied when the pretensioner is activated and can withstand the load applied when the passenger is restrained by appropriately setting the diameter and material of the shaft portion 80B. It is comprised so that it may not break.

When the shaft portion 80B of the roller 80 breaks, the roller 80 moves relative to the body portion 51 of the support portion 50 upward in the tongue vertical direction, and fits between the first wall portion 62A and the second wall portion 64A. At this time, a portion of the webbing 20 closer to the shoulder belt 20S than the folded portion 20V is sandwiched between the roller 80 and the first wall portion 62A.
In this way, the roller 80 according to the first embodiment does not move relative to the first wall portion 62A depending on the load applied from the webbing 20 when the pretensioner is operated, and the first is applied depending on the load applied from the webbing 20 when the occupant is restrained. The webbing 20 is moved relative to the wall part 62A and sandwiched between the first wall part 62A and the movement of the webbing 20 relative to the tongue 40 is restricted (the webbing is locked).

<Effect>
Next, functions and effects of the three-point seat belt device S1 according to the first embodiment will be described.

  In the three-point seat belt device S1 according to the first embodiment, the tongue 40 has a first wall portion 62A and a roller 80. The webbing 20 is wound around the roller 80 so as to be folded back in the mounted state. The roller 80 does not move relative to the first wall portion 62A due to the load applied from the webbing 20 when the pretensioner is operated, and the roller 80 is not moved relative to the first wall portion 62A due to a larger load applied from the webbing 20 when the occupant is restrained. The webbing 20 is locked while the webbing 20 is sandwiched between the first wall 62A and the first wall 62A.

Therefore, when the pretensioner is operated, the roller 80 functions as a roller without moving relative to the first wall portion 62A, and friction at the folded portion 20V of the webbing 20 is reduced. Accordingly, the webbing 20 moves smoothly between the shoulder belt 20S side and the lap belt 20L side across the folded portion 20V, and the sagging of the webbing 20 is effectively removed.
Thereafter, when the occupant is restrained, the shaft portion 80B is broken and the roller 80 moves relative to the first wall portion 62A, and the webbing 20 is clamped between the first wall portion 62A and the roller 80, and the webbing 20 is locked. Is done.

  Therefore, according to the three-point seat belt device S1 according to the first embodiment, the slack of the webbing 20 is effectively removed when the pretensioner is operated, and the movement of the webbing 20 relative to the tongue 40 is restricted when the passenger is restrained. Is effectively restrained.

In the present embodiment, the retractor 32 on the shoulder belt 20S side with respect to the tongue 40 is provided with a pretensioner mechanism, so that the webbing 20 is drawn to the shoulder anchor 34 side when the pretensioner is activated. Therefore, the roller 80 is provided in the turn-up portion 20, so that the webbing 20 is smoothly moved from the lap belt 20L side to the shoulder belt 20S side during the pretensioner operation, and the lap belt 20L is appropriately bent. Removed.
However, the “pretensioner device” of the three-point seat belt device of the present invention is not limited to the type in which the webbing is drawn into the shoulder anchor side. For example, the pretensioner device may be a retractor provided at the end of the webbing 20 on the lap belt side, or may be a type of pretensioner device in which the buckle is instantaneously lowered below the seat. May be combined. In any type, since the roller 80 is set in the folded portion 20V of the webbing 20, there is an effect that the deflection of the webbing 20 is effectively removed when the pretensioner is operated.

By the way, for example, when the occupant is restrained, the load generated on the lap belt 20L may be larger than the load generated on the shoulder belt 20S. In this case, the webbing 20 tends to move from the shoulder belt 20S side to the lap belt 20L side, and this movement may adversely affect occupant restraint by the lap belt 20L. Here, in the three-point seat belt device S1 according to the first embodiment, since the webbing 20 is locked when the occupant is restrained, it is possible to appropriately ensure the restraining performance of the occupant's waist by the lap belt.
In this case, the following effects are also produced as a synergistic effect. That is, when the restraint of the occupant's waist is appropriately performed, the restraint ratio at the collarbone increases and the restraint ratio at the abdomen decreases in the restraint of the upper body of the occupant by the shoulder belt 20S, so that the occupant can be appropriately protected. it can.

  On the other hand, when the passenger is restrained, the load generated on the shoulder belt 20S may be larger than the load generated on the lap belt 20L. In this case, the webbing 20 tries to move from the lap belt 20L side to the shoulder belt 20S, and this movement may adversely affect occupant restraint by the shoulder belt 20S. Here, in the three-point seat belt device according to the first embodiment, since the webbing 20 is locked when the occupant is restrained, the restraining performance of the upper body of the occupant by the shoulder belt 20S can be appropriately ensured.

Further, in the three-point seat belt device S1 according to the first embodiment, as shown in FIG. 1, the support portion 50 of the tongue 40 supports one end portion in the seat width direction of the lap belt 20L in the mounted state. At the same time, the one end in the sheet width direction of the shoulder belt 20S is supported at a position spaced above the seat from the position where the one end in the sheet width direction of the lap belt 20L is supported.
Therefore, the submarine phenomenon is applied to the one end portion in the seat width direction of the lap belt 20L while the support position of the one end portion in the seat width direction of the shoulder belt 20S is set to an appropriate height position for restraining the upper body of the occupant. It can be set to a low position where it can be suppressed.
Further, since the position of the folded portion 20V of the webbing 20 can be set to a low position in association with setting the one end of the lap belt 20L in the sheet width direction to a low position, the folded angle of the folded portion 20V is close to 180 degrees. The angle (the angle when the webbing 20 is viewed in the axial direction of the roller 80, see FIG. 4) can be approached. Therefore, the load direction acting on the roller 80 from the lap belt 20L side and the load direction acting on the roller 80 from the shoulder belt 20S side approach the same direction when the occupant is restrained. As a result, the roller 80 can be relatively moved in an appropriate direction, and the webbing 20 can be locked at an early stage when the occupant is restrained.

Further, in the three-point seat belt device S1 according to the first embodiment, as shown in FIG. 1, the support portion 50 is held at a position above the seat with respect to the buckle 70 in the mounted state. Is provided with an extension 52 that can push the disengagement button 72 of the buckle 70 when operated by an occupant.
For this reason, when the seat belt is to be disengaged from the mounted state, as shown in FIG. 6, the occupant operates the extension 52 provided on the support portion 50, thereby releasing the disengagement button 72 provided on the buckle 70. The seat belt can be dissociated by pushing indirectly. Therefore, even when the height position of the buckle 70 is set low, it is not necessary to reach to the release button 72 of the buckle 70 set low, and the support portion 50 held at the position above the seat with respect to the buckle 70. Since the extension 52 is operated, the usability is good. Further, as the buckle 70 is set to a low position, the support position of the one end portion in the seat width direction of the lap belt 20L can be set to a low position. Setting the support position of the one end portion in the sheet width direction of the lap belt 20L to a low position is advantageous for suppressing the submarine phenomenon and for locking by the roller 80 as described above.

By the way, for example, when the pretensioner mechanism or the pre-crash seat belt mechanism of the retractor 32 is activated (hereinafter, simply referred to as “when the pretensioner is activated”), the buckle 70 is pulled by the webbing 20 drawn into the shoulder anchor 34 side. The stay 74 to which is attached rotates around the anchor position A (see FIGS. 2 and 3), and the buckle 70 may move upward and diagonally upward. If the buckle 70 moves obliquely upward during the pretensioner operation, which is the previous stage of restraining the occupant, the one side end in the vehicle width direction of the lap belt 20L also moves upward, and as a result, it works against the suppression of the submarine phenomenon. There is.
Further, at the initial stage of occupant restraint, a load from the occupant is transmitted to the buckle 70 through the webbing 20, and the stay 74 rotates about the anchor position A, and the buckle 70 may move substantially forward. If the buckle 70 moves substantially forward at the initial stage of occupant restraint, the restraint force on the occupant is reduced correspondingly, which may be disadvantageous with respect to occupant restraint.
In this respect, in the three-point seat belt device S according to the present embodiment, the position of the buckle 70 can be set low as described above, so the distance between the buckle 70 and the anchor position A, that is, the rotation radius of the buckle 70 is Can be small. Therefore, the amount of movement of the buckle 70 due to the rotation of the stay 74 is reduced, and the adverse effect of the rotation of the stay 74 on the suppression of the submarine phenomenon and the restraint performance at the initial stage of passenger restraint is less likely to be affected.

  In the three-point seat belt device S1 according to the first embodiment, as shown in FIG. 3, the intermediate belt 20M (the portion between the lap belt 20L and the shoulder belt 20S in the webbing 20) at the lap side outlet 50L. ) Is folded back in a direction in which the lap belt 20L tilts forward. For this reason, for example, when the pretensioner is operated, the rotation of the stay 74 when the webbing 20 is pulled toward the shoulder anchor 34 is suppressed. Therefore, it is difficult to be adversely affected by the rotation of the stay 74 during the pretensioner operation.

  In the first embodiment, as described above, as illustrated in FIG. 3, the lap belt 20L is folded back in the direction in which the lap belt 20L is inclined forward with respect to the intermediate belt 20M at the lap side outlet 50L provided with the roller 80. Yes. When the pretensioner is activated, the webbing 20 is drawn to the shoulder anchor 34 side. Therefore, when the pretensioner is operated, the position of the roller 80 where the webbing 20 is wound may be biased to the rear of the sheet (that is, there is a possibility of jamming). However, in the first embodiment, the support portion 50 is formed in a cylindrical shape so as to surround the intermediate belt 20M, and is supported in a state in which the intermediate belt 20M is inserted. It is suppressed that the position to be hung is biased to the rear of the seat.

  In the three-point seat belt device S1 according to the first embodiment, the upper end 52T of the extension 52 is positioned at the upper end of the support portion 50, as shown in FIG. As shown in FIG. 6, the disengagement button 72 of the buckle 70 can be indirectly operated by operating the finger 52 against the upper end 52 </ b> T of the extension 52 positioned at the upper end of the support portion 50. For this reason, when it is desired to disengage the seat belt, the position where the occupant needs to reach his / her hand is high, and the usability is high.

  Further, in the three-point seat belt device S1 according to the first embodiment, as shown in FIG. 5A, the intermediate belt 20M is surrounded by a sectional view of the cylindrical support portion 50. A part of the portion is constituted by the extension 52. In other words, a part of the extension 52 (such as the outer appearance part 56) is opposed to the intermediate belt 20M without being interposed between the intermediate belt 20M and constitutes a part of the outer appearance of the cylindrical support part 50. doing. For this reason, compared with the case where an extension is provided separately from the cylindrical member surrounding the intermediate belt 20M, the structure of the cylindrical support portion 50 is simple, and the tongue 40 can be easily reduced in weight.

Further, in the three-point seat belt device S1 according to the first embodiment, as shown in FIG. 3, the support portion 50 of the tongue 40 is connected to the lap belt 20L of the webbing 20 (the one end portion in the seat width direction). The intermediate belt 20M, which is a portion between the shoulder belt 20S (one end portion in the sheet width direction), extends linearly, and is formed in a longitudinal cylindrical shape with the extending direction of the intermediate belt 20M as a longitudinal direction. . And the longitudinal direction of the support part 50 is substantially in agreement with the insertion direction to the buckle 70 of the insertion part 60. FIG. For this reason, it is easy to perform the operation of grasping the support portion 50 of the tongue 40 and inserting the insertion portion 60 into the buckle (“insertion operation”).
Further, the buckle 70 is located in front of the anchor position A and above the seat. This also facilitates the insertion operation.
Furthermore, a virtual straight line IL extending from the buckle 70 in the insertion direction passes through the front side of the seat at the anchor position A. As a result, the upper portion of the intermediate belt 20M is inclined rearward from another imaginary line (not shown) connecting the anchor position A and one end of the lap belt 20L in the vehicle width direction, so that the seat of the shoulder belt 20S The width direction one side edge part can be arrange | positioned in the position of a sheet | seat back side. As a result, the restraining performance of the upper body can be further improved.

  Further, in the three-point seat belt device S1 according to the first embodiment, the tongue 40 has the second wall portion 64A facing the first wall portion 62A. The gap between the first wall portion 62A and the second wall portion 64A is narrowed toward the upper side of the seat at the time of wearing. When the passenger is restrained, the roller 80 is moved upward in the seat vertical direction by the load applied from the webbing 20. By moving, the roller 80 fits between the first wall portion 62A and the second wall portion 64A, whereby the webbing 20 is locked. For this reason, it is not necessary to provide a structure like the insertion groove of patent document 1, and a locking tongue can be implement | achieved with a simple structure.

(Supplementary explanation of the first embodiment)
In the first embodiment, when the occupant is restrained, the roller 80 fits between the first wall portion 62A and the second wall portion 64A, so that the webbing 20 is sandwiched between the roller 80 and the first wall portion 62A. Although the example to be described was demonstrated, this invention is not limited to this. For example, an insertion groove that defines the relative movement direction of the roller is provided in the tongue, the shaft part of the roller is placed in the insertion groove, and the roller is locked at a predetermined position by a shear pin during normal operation. Then, the roller may relatively move along the insertion groove, and the webbing may be sandwiched between the roller and a part of the tongue (corresponding to the “wall portion” of the present invention). That is, the three-point seat belt device according to the present invention may not include the second wall portion.

[Second Embodiment]
Next, a three-point seat belt device S2 according to the second embodiment will be described with reference to FIGS.

The three-point seat belt device S2 according to the second embodiment differs from the three-point seat belt device S1 according to the first embodiment in the structure near the lap side outlet 50L in the support portion 50 of the tongue 40. Yes.
Hereafter, a different part from 1st Embodiment is demonstrated, about the same structure as 1st Embodiment, the same code | symbol is attached | subjected to drawing and description is abbreviate | omitted.

  As shown in FIG. 8, the main body 151 of the support portion 150 of the second embodiment is provided with an auxiliary roller 82 on the upper side of the opposing plate portion 64 in the tongue vertical direction. The auxiliary roller 82 is rotatable with respect to the main body 151 with the tongue width direction as an axial direction.

  The lap belt 20L side of the webbing 20 from the folded portion 20V passes between the roller 80 and the second wall portion 64A and is wound around the auxiliary roller 82. Of the front and back surfaces of the webbing 20, the surface wound around the auxiliary roller 82 is a surface (back surface) opposite to the surface (back surface) wound around the roller 80. And the webbing 20 has come out of the tongue 40 from the opening formed in the main-body part 151. FIG. By the auxiliary roller 82, the turning angle of the webbing 20 at the turning portion 20V by the roller 80 (the angle in the line-of-sight direction in FIG. 8) is set to an angle larger than 180 degrees.

<Effect>
Next, functions and effects of the three-point seat belt device S2 according to the second embodiment will be described.

In the three-point seat belt device S2 according to the second embodiment, as shown in FIG. 8, the gap between the first wall portion 62A and the second wall portion 64A is the tongue vertical direction as in the first embodiment. As it goes to the upper side, it becomes narrower. As a result, it becomes narrower as it goes to the upper side of the seat at the time of mounting. When the occupant is restrained, as shown in FIG. 9, the shaft portion 80B of the roller 80 is broken, and the roller 80 moves relative to the upper side of the sheet, so that the roller 80 and the second wall portion 62A are connected to the second wall portion 62A. It fits between the wall 64A.
On the other hand, in the three-point seat belt device S2 according to the second embodiment, as shown in FIG. 8, unlike the first embodiment, the portion of the webbing 20 on the shoulder belt 20S side with respect to the folded portion 20V is the roller 80. In addition to passing between the first wall portion 62A, a portion of the webbing 20 closer to the lap belt 20L than the folded portion 20V passes between the roller 80 and the second wall portion 64A. Therefore, when the occupant is restrained, as shown in FIG. 9, when the roller 80 fits between the first wall portion 62A and the second wall portion 64A, the webbing 20 is placed between the roller 80 and the first wall portion 62A. In addition, the webbing 20 is also sandwiched between the roller 80 and the second wall portion 64A.

  In the first embodiment, the roller 80 sandwiches the webbing 20 only with the first wall portion 62A, whereas in the second embodiment, not only with the first wall portion 62A, Since the webbing 20 is sandwiched between the second wall portion 64A, the webbing 20 can be effectively locked.

  Further, in the three-point seat belt device S <b> 2 according to the second embodiment, the support unit 50 includes an auxiliary roller 82. The auxiliary roller 82 is wound around the surface of the webbing 20 that is closer to the lap belt 20L than the folded portion 20V (the surface opposite to the surface that the roller 80 is in contact with). Thereby, the webbing 20 is not in contact with the second wall portion 64A in the mounted state, or the friction is low even if the webbing 20 is in contact. Therefore, in the three-point seat belt device S2 according to the second embodiment, the webbing 20 is effectively held by holding the webbing 20 at two locations while restraining the occupant while securing the webbing pull-in efficiency when the pretensioner is operated. Can lock.

[Supplementary explanation of the second embodiment]
In addition, although 2nd Embodiment demonstrated the example which provided the auxiliary roller 82 around which the surface side of the part of the lap belt 20L side rather than the folding | turning part 20V in webbing 20 was provided, the setting of the auxiliary roller 82 of 2nd Embodiment is provided. Even if the auxiliary roller 82 is not provided at a location, clamping at two locations can be realized. Further, for example, a columnar auxiliary guide having an axial direction in the tongue width direction may be provided at a set position of the auxiliary roller 82 without having a function as a roller. In this case, the friction received by the webbing 20 is increased as compared with the case where the auxiliary roller 82 is provided, but the influence of the friction in this portion is smaller than that of the folded portion 20V provided with the roller 80. Therefore, by setting the auxiliary guide instead of the auxiliary roller 82, the tongue structure can be simplified while minimizing the adverse effects of friction.

[Supplementary explanation]
In the above embodiment, the example in which the three-point seat belt device of the present invention is applied to the vehicle seat 10 that is the driver's seat has been described. However, the present invention may be applied to the passenger seat or the rear seat. May be applied. Moreover, although the example where the seat front-rear direction coincides with the vehicle front-rear direction has been described, the present invention is not limited to this.

  In the above embodiment, the example in which the roller 80 moves relative to the first wall portion 62A by breaking the shaft portion 80B of the roller 80 when the occupant is restrained has been described, but the present invention is not limited to this. . For example, the roller itself is not broken, and a member for fixing the relative position of the roller to the wall portion is provided separately from the roller, and the roller is moved relative to the wall portion by breaking the fixing member. Also good.

  Moreover, although the example in which the retractor 32 was provided in the longitudinal direction one end side of the webbing 20 was demonstrated, this invention is not limited to this, The retractor may be provided in the longitudinal direction other end side of webbing. Further, the retractor may be built in the vehicle seat.

  Moreover, although the longitudinal direction other end part of the webbing 20 demonstrated the anchor member 36 vicinity of the lower end part of B pillar, the present invention is not limited to this. For example, the other end in the longitudinal direction of the webbing 20 may be locked to a part of the vehicle seat.

S1, S2 Three-point seat belt device 10 Vehicle seat 20 Webbing 20L Lap belt 20S Shoulder belt 20V Folding portion 32 Retractor (pretensioner device)
40 tongue 50, 150 support 52 extension 62A first wall (wall)
64A Second wall portion 70 Buckle 72 Release button 80 Roller 82 Auxiliary roller W1 One side in the sheet width direction W2 The other side in the sheet width direction

Claims (6)

A pretensioner device;
The webbing is wrapped so that the wall part and the seat belt are attached to the seated occupant, and the occupant does not move relative to the wall part depending on the load applied from the webbing when the pretensioner is activated. A tongue having a roller that locks the webbing by moving relative to the wall part and sandwiching the webbing between the wall part depending on a load applied from the webbing when restrained,
A three-point seat belt device. In the mounted state, the tongue supports the one end of the lap belt in the seat width direction, and the shoulder belt is located at a position spaced above the seat from the position of supporting the one end of the lap belt in the seat width direction. Having a support part for supporting one side end part in the sheet width direction;
The three-point seat belt device according to claim 1. The vehicle seat is further provided with a buckle provided on one side of the seat width direction and having a release button,
In the mounted state, the support portion is held at a position above the seat with respect to the buckle,
The support is provided with an extension that allows the occupant to operate the disengagement button.
The three-point seat belt device according to claim 2. The tongue has a second wall portion facing the wall portion,
The gap between the wall portion and the second wall portion is narrowed toward the seat upper side when mounted,
When the occupant is restrained, the roller is relatively moved and fitted between the wall portion and the second wall portion to lock the webbing,
The three-point seat belt device according to any one of claims 1 to 3. The shoulder belt side portion of the webbing that is the portion of the webbing that is folded back by the roller passes between the roller and the wall portion, and the webbing is more than the folded portion of the lap belt. A side portion passes between the roller and the second wall,
When the occupant is restrained, the roller fits between the wall portion and the second wall portion to sandwich the webbing between the wall portion and the webbing between the second wall portion. To
The three-point seat belt device according to claim 4. The tongue has an auxiliary roller around which a surface opposite to the surface in contact with the roller of the portion on the lap belt side of the folded portion in the webbing is wound,
The three-point seat belt device according to claim 5.